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  • 251.
    Bildsten, Louise
    et al.
    Industrial Marketing, Department of Management and Engineering, Linköping Institute of Technology.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Sandberg, Erik
    Logistics Management, Department of Management and Engineering, Linköping Institute of Technology.
    Value-driven purshasing of kitchen cabinets in industrialized housing2011Inngår i: Journal of Financial Management of Property and Construction, ISSN 1363-2175, Vol. 16, nr 1, s. 73-83Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose – The purpose of this paper is to hypothesize that value-driven purchasing of customized kitchen cabinets is more profitable than market-driven purchasing in industrialised housing construction. The hypothesis is examined through a case study of kitchen carpentry at one of the Sweden's largest producers of industrialised prefabricated multi-storey housing. By comparing characteristics of market- vs value-driven purchasing, this paper aims to further clarify the benefits and drawbacks of these two strategies. Design/methodology/approach – By comparing characteristics of market- vs value-driven purchasing, a theoretical framework is proposed that clarifies the benefits and drawbacks of the two strategies. An explorative case study of kitchen carpentry at a house manufacturer illustrates purchasing of kitchen cabinets in the industrialised housing industry in relation to the proposed framework. Findings – The case study results indicate that, from a value perspective, a long-term relationship with a dedicated local smaller supplier is a preferable choice over a short-term relationship with a low-price mass producer. Research limitations/implications – This is a single case study that should be verified by further empirical work of a test delivery from the local sub-system manufacturer. Such a study would provide more insights into this area of work and make it possible to thoroughly evaluate potential risks. The indicative results in this paper can be made conclusive through quantification of the proposed lean purchasing characteristics. Originality/value – A comparison of value- and market-driven purchasing is carried out in theory and applied to a real case study that brings new perspectives to purchasing. In this way, the paper proposes alternative purchasing strategies to the construction industry

  • 252.
    Bildsten, Louise
    et al.
    Linköping University.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Sandberg, Erik
    Linköping University.
    Value-driven vs. market-driven purchasing of kitchen cabinets2010Inngår i: Proceedings IGLC-18: 18th Conference of the International Group for Lean Construction / [ed] Ken Walsh; Thais Alves, Haifa: Technion-Israel Institute of Technology , 2010, s. 202-211Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In economic and management literature, the relationship between supplier and buyer can be more or less intimate. It can vary from market-driven with a constant change of suppliers to a value-driven relationship with one sole supplier. Purchasing strategies of construction companies have often been described as short-sighted, where price is the most considered aspect. Recent lean management literature promote value-driven purchasing, since it provides benefits such as just-in-time delivery, zero defects and customized products through close technical collaboration. This article hypothesises that value-driven purchasing of customized kitchen cabinets is more profitable than market-driven purchasing in industrialized housing construction. The hypothesis is examined through a case study of kitchen carpentry at one of Sweden‘s largest producers of industrialized prefabricated multi-storey housing. By comparing characteristics of market-driven vs. value-driven purchasing, this article aims to further clarify the benefits and drawbacks of these two strategies. At the case company, kitchens are ordered cabinet-by-cabinet and then installed inside the factory. The company is considering the possibility of a long-term relationship with a smaller local supplier that can deliver a new kind of innovative kitchen cabinet solution that is prefabricated. If the local supplier can meet the expectations of just-in-time delivery, zero defects and a product -tailor-made‖ for the housing company, there is much to gain.

  • 253.
    Bildsten, Louise
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Erikshammar, Jarkko
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Haller, Martin
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Värdeflödesanalys hjälper företag att korta ledtider, minska lager och ta bort slöseri2010Annet (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Forskning vid Luleå tekniska universitet har visat på att Värdeflödesanalys (VFA) kan hjälpa företag att korta ledtider, minska lager och reducera slöseri genom att hitta en gemensam bild över företagets processer och fokusera mer på kundbehovet. En utvecklad arbetsmodell lyfter fram vikten av planering, ha rätt team och följa upp resultatet.

  • 254.
    Billberg, Peter
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap.
    Form pressure generated by self-compacting concrete: influence of thixotropy and structural behaviour at rest2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Self-compacting concrete (SCC) offers rational and fast casting process since it merely has to be poured, or pumped, into the formwork without any compaction work needed. But this can be at the cost of high form pressure. However, reported results show that SCC can act thixotropically, i.e., build up a structure at rest, and this can reduce the form pressure considerably. Thus, in order to utilise the favourable possibilities to increase effectiveness without risking form collapses, the need arises for deeper and broader understanding of the mechanisms behind this thixotropic behaviour.

    Methodologies have been developed for the characterisation and measurement of the structural build-up at rest, both for the fluid (micro mortar) phase and the concrete itself. Hypotheses state that thixotropic mechanisms originate within the colloidal domain and, thus, motivate studies on the fluid phase comprising this domain. The stress-strain methodology is based on the hypothesis stating that the magnitude of the structure is represented by the maximum elastic stress the fresh material can withstand before the structure breaks. An instrumented steel tube is used to simulate various casting heights and rates.

    Results show that both micro mortar and SCC are thixotropic and this behaviour is influenced by every measure taken influencing the interparticle colloidal forces. The time-dependent structural build-up of SCC is a function of an irreversible structure (slump-loss) and a reversible, thixotropic structure.

    There is apparently a threshold value of the structural build-up necessary to reach before obtaining any significant form pressure reduction. Housing SCC´s, with W/C = 0.58, show low degree of structural build-up and pressure decrease while civil engineering SCC´s can show the opposite, but this often at the cost of slump-loss.

    Recommendations are presented and for the nearest future, suggesting a conservatism regarding design of formwork systems when SCC is used. If the behaviour of a SCC is known it should be used to optimise the formwork. If not, calculating with hydrostatic pressure should be done or the knowledge missing should be gained by using this methodology. A third option is given and this is to monitor the form pressure in real time using sensors.

  • 255.
    Billgren, Annette
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för bygg- och energiteknik (BE).
    Kvarteret Allön 4: Gammalt och nytt i en spännande kombination2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Kristianstads bakgator bestod fram till en bit in på 1900-talet av låg bebyggelse i ett och två plan. Idag finns endast fem bevarade envåningshus kvar inom stadskärnan. Ett av dessa hus har nu under en längre tid fått stå tomt och förfalla medan ett rivningshot inväntas.

    Diskussionerna om vad man ska göra med kvarteret har pågått i snart 20 år, utan att man lyckats nå någon lösning, situationen är minst sagt låst.

    Detta arbete lägger fram nya idéer och förslag på hur huset och kvarteret som det ligger i skulle kunna utvecklas, förslaget som ser till de olika parternas önskemål och som skulle kunna vara en lösning för både huset, staden och fastighetsägaren.

     

  • 256.
    Billing, Rasmus
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Byggnadsteknik.
    Ett vätternära åldrande2007Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Detta examensarbetes syfte är att upprätta ett byggnadsförslag för tre flerbostadshus på en strandnära tomt i Vättersnäs i Jönköping. Rapporten omfattar utredning, skisser, färdiga systemhandlingar samt presentationsmaterial.

    Bakgrund: Uppslaget till examensarbetet kom efter samtal med Benny Hunemark på kommunens plankontor. Där jag fick information om att en person vid namn Leif Larsson startat en ”intresseförening” med mål att genomdriva byggnation av +55 boende på en strandnära tomt i Vättersnäs. Kommunen har här lagt en detaljplan som förespråkar 3 stycken punkthus i 3 våningar vardera. Det fanns från kommunens sida intresse att utreda alternativet med +55 boende i delar av projektet eftersom behovet av boendeformen förväntas öka inom kommunen. Genomförande: Efter att ha studerat flera redan byggda +55 boenden och där noterat fördelar och nackdelar i dessa projekt och efter att ha tagit del av det skriftliga material som finns utgivet om denna problemställning började jag ”ideskissa” på ett planförslag. Därefter har jag i samråd med och efter invändningar av min kontaktperson på kommunen Benny Hunemark, ovan nämnda Leif Larson, Kaj Granath handledare på skolan, arkitekterna SAR/MSA Tomas Hansen och SAR/MSA Joachim Billing omarbetat förslaget i flera etapper för att slutligen nå det resultat som här presenteras och kommer överlämnas till beställaren.

    Resultat: Det slutliga förslaget ”Ett Vätternära åldrande” är genomgående projekterat efter de förhöjda funktionsmått som förespråkas i kommunens nyutgivna publikation ”Bättre för alla”. Detta med anledning av att alla lägenheter i projektet skall vara möjliga att bo kvar i med hög boendekomfort, trots den nedsatta rörelse och orienteringsförmåga som kan komma med stigande ålder. Förslaget förespråkar dock i sitt grundutförande bara att det nodligaste huset speciellt avsätts för boendeformen +55 boende.

    Diskussion: Förslaget har efter färdigställande jämförts med kommunens upprättade illustrationskarta över området och diskuterats med de under projektet inblandade parterna.

  • 257.
    Billmark, André
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Delreparationer av våtrum ur ett hållbart perspektiv2014Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Varje år anmäls det uppskattningsvis 80 000 vattenskador i fastigheter till en kostnad på nära fem miljarder kronor för de svenska försäkringbolagen. Folksam som är ett av de största försäkringsbolagen i Sverige står för cirka 26 % av de svenska villaförsäkringarna och beställer byggreparationer för uppskattningsvis 800 miljoner kronor årligen till dessa fastigheter. Som beställare av arbeten på 800 miljoner kronor finns det möjligheter att ställa krav på byggbranschen, vilket även görs.Det är inte bara Folksam som ställer krav, försäkringsbolagen sammarbetar ofta för att hjälpa till att effektivisera byggbranschen. I nuläget fokuserar försäkringsbolagen på hållbarhet, de sammarbetar med olika branschorganisationer för att möjliggöra delreparationer i våtutrymmen. Detta är något som tidigare inte varit möjligt då det inte funnits anvisningar till hur detta ska genomgöras och materialtillverkare har inte haft monteringsanvisningar för detta, delreparationer kan därför inte utföras på ett fack-mannamässigt sätt. Då det inte utförs fackmannamässigt följs inte de branschregler som idag finns i Sverige, behöriga företag utför enbart arbeten som följer branschreglerna de är certifierade inom. Exempel kan de vara certifierade inom Byggkeramikrådets branschregeler eller Säkra våtrumAv de 800 miljoner kronor som Folksam betalar ut i byggskador finns det ett mörkertal på en kostnad av skador som egentligen inte ska ersättas. Genom att öka försäkringstagares kunskaper angående fördelarna med delreparationer ska mörkertalet minskas. Det är inte bara utgifterna på 800 miljoner som kan minskas utan även en minskning av den negativa miljöbelastningen och den ohälsa som finns hos fastighetsbrukare. Uppskattningsvis kan upp till 90 % av materialet i ett våtrum sparas genom att utföra en delreparation. Utförandetiden och kostnaden av delreparationer kan minska till 1/5 genom att undvika heltäckande reparationer. Minskad utförandetid minskar perioden som de boende inte kan bruka våtrummet. Skadan åtgärdas i ett tidigt skede vilket bidrar till att motverka de boendes ohälsa som kan uppstå till följd av mögel eller liknande.Fastighetsägaren kan ta till sig denna information och se värdet i att kunna utföra delreparationer och samtidigt bidra till en hållbar utveckling.Genom djupgående studier ska information som ökar fastigetsägarnas vetskap om de framtida möjligheterna med delreparationer, samt för- och nackdelar med dessa metoder.

  • 258.
    Binak, Burbuqe
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013).
    Olsson, Maria
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013).
    ARBETSMILJÖ OCH TILLGÄNGLIGHET I BOSTÄDER: Arbetsmiljö för personal inom hemtjänst i relation till svensk bostadsplanering2015Independent thesis Basic level (university diploma), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    Tack vare tekniska och medicinska framsteg kan idag mycket av den vård som ges på sjukhus och vårdinrättningar tillgodoses i det egna hemmet. Ur ett samhällsekonomiskt perspektiv är detta en fördel eftersom vård i hemmet är betydligt billigare än en likvärdig behandling med sängplats på sjukhus. Allt eftersom vårdtyngden ökar i hemmen har det visat sig att belastningsskadorna hos den personal som utför arbetet ökat. Omvårdnadspersonal inom hemtjänsten är nu den yrkesgrupp som står för flest arbetsskador i Sverige. Orsaken är att dagens bostäder inte är anpassade för vård av svårt sjuka och funktionsnedsatta i hemmen. Utrymmesbrist leder till att personalen inte kan ta hjälp av lyfthjälpmedel eller använda sig av intränad lyftteknik vid personförflyttning. Störst risk för skada föreligger i sovrum, på toaletter och i badrum eftersom merparten av förflyttningen sker där. För att hindra detta måste dagens och framtida bostäder byggas med generösare tillgänglighetskrav. Kostnaderna för den utökade tillgängligheten bör finansieras genom subventioner. Genom att bygga bostäder som säkerställer en god arbetsmiljö för omsorgspersonalen kommer samhällets kostnader för sjukskrivningar och förtidig utslagning från arbetsmarknaden att minska.I detta arbete undersöks skillnaderna mellan 1 ordinärtboende, 3 Seniorboenden och 1 trygghetsboende och med hjälp av plananalyser och enkätundersökningar vill vi visa att det finns brister i tillgänglighet fastän de är handikappsanpassade.

  • 259. Birchall, Sarah
    et al.
    Gustafsson, Marcus
    Högskolan Dalarna, Akademin Industri och samhälle, Energiteknik. KTH.
    Wallis, Ian
    Dipasquale, Chiara
    Bellini, Alessandro
    Fedrizzi, Roberto
    Survery and simulation of energy use in the European building stock2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    the work towards increased energy efficiency. In order to plan and perform effective energy renovation of the buildings, it is necessary to have adequate information on the current status of the buildings in terms of architectural features and energy needs. Unfortunately, the official statistics do not include all of the needed information for the whole building stock.

     

    This paper aims to fill the gaps in the statistics by gathering data from studies, projects and national energy agencies, and by calibrating TRNSYS models against the existing data to complete missing energy demand data, for countries with similar climate, through simulation. The survey was limited to residential and office buildings in the EU member states (before July 2013). This work was carried out as part of the EU FP7 project iNSPiRe.

     

    The building stock survey revealed over 70% of the residential and office floor area is concentrated in the six most populated countries. The total energy consumption in the residential sector is 14 times that of the office sector. In the residential sector, single family houses represent 60% of the heated floor area, albeit with different share in the different countries, indicating that retrofit solutions cannot be focused only on multi-family houses.

     

    The simulation results indicate that residential buildings in central and southern European countries are not always heated to 20 °C, but are kept at a lower temperature during at least part of the day. Improving the energy performance of these houses through renovation could allow the occupants to increase the room temperature and improve their thermal comfort, even though the potential for energy savings would then be reduced.

  • 260.
    Birchall, Sarah
    et al.
    BSRIA.
    Gustafsson, Marcus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Strömnings- och klimatteknik. Högskolan Dalarna, Sweden.
    Wallis, Ian
    BSRIA.
    Dipasquale, Chiara
    EURAC.
    Bellini, Alessandro
    EURAC.
    Fedrizzi, Roberto
    EURAC.
    Survey and simulation of energy use in the European building stock2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Buildings account for around 40% of the final energy consumption in Europe and are central in the work towards increased energy efficiency. In order to plan and perform effective energy renovation of the buildings, it is necessary to have adequate information on the current status of the buildings in terms of architectural features and energy needs. Unfortunately, the official statistics do not include all of the needed information for the whole building stock.

     

    This paper aims to fill the gaps in the statistics by gathering data from studies, projects and national energy agencies, and by calibrating TRNSYS models against the existing data to complete missing energy demand data, for countries with similar climate, through simulation. The survey was limited to residential and office buildings in the EU member states (before July 2013). This work was carried out as part of the EU FP7 project iNSPiRe.

     

    The building stock survey revealed over 70% of the residential and office floor area is concentrated in the six most populated countries. The total energy consumption in the residential sector is 14 times that of the office sector. In the residential sector, single family houses represent 60% of the heated floor area, albeit with different share in the different countries, indicating that retrofit solutions cannot be focused only on multi-family houses.

     

    The simulation results indicate that residential buildings in central and southern European countries are not always heated to 20 °C, but are kept at a lower temperature during at least part of the day. Improving the energy performance of these houses through renovation could allow the occupants to increase the room temperature and improve their thermal comfort, even though the potential for energy savings would then be reduced.

  • 261.
    Bjurman, Jonny
    et al.
    Department of Conservation, University of Gothenburg, Gothenburg, Sweden.
    Leijonhufvud, Gustaf
    Högskolan på Gotland, Institutionen för kultur, energi och miljö.
    An analysis of microclimate differences leading to sporadic mould growth in Skokloster Castle, an unheated historic building2012Inngår i: Energy Efficiency in Historic Buildings: Postprints from the Conference : Visby, February 9–11, 2011, Gotland University Press, 2012, s. 236-244Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Mould growth has repeatedly occurred in Skokloster Castle over the years. Visible mould was also found during a survey in September 2010. Mould has been found sporadically on walls, books and tapestries and behind paintings and within furniture in parts of the castle. Work is presented on the attempted correlation of incidence of mould growth and indoor climate recorded mainly during one year, from July 2008 to August 2009. The indoor climate is influenced to a high extent by the outdoor climate but is clearly improved by the influence of the building envelope. The absolute humidity is almost the same in the whole castle. Temperature differences between rooms are therefore decisive for the recorded differences in RH. Recorded RH differences could partly explain the location of mould growth. The results are discussed in relation to current models describing the critical levels of RH, temperature and substrates supporting mould growth.

  • 262.
    Björk, Evelina
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Byggnadsteknik.
    Fast, Kim
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Byggnadsteknik.
    Effektivisering av energianvändningen i en förskola2011Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    This rapport contains an examination of the energy consumption of a kindergarten, which areas that have the largest impact on the energy consumption and what can be done to reduce those areas in ways that are relatively easy and profitable. It is also analyzed if it is possible to reduce the energy consumption from today’s consumption to a consumption that fulfils the demands placed on low energy houses by FEBY.

    The focus has been on reducing the energy consumption of the areas ventilation, heating system and hot water system, since those seemed to be the easiest ones to affect and since the building is quite recently built.

    There are different kinds of ventilation systems, at the moment the building have a CAV-system, which means that the ventilation is too high during large parts of the day. There are different ways to manage the ventilation system, for example presence detection, humidity sensors, CO2 sensors, temperature sensors and season adjustment. Many of those are in the end dependent on CO2 sensors to guarantee a good indoor climate, therefore the focus have been placed on this system.  

    The building is heated through district heating which is relatively easy to connect to a couple of sun panels to contribute to the heating system and hot water system. There are different ways of connecting district heating with solar panels and those are described, as well as the cost and the repayment time. A comparison with a building with an electric heating system has been made as well.

    It is important to get solutions that are profitable, that the repayment time isn’t too long. Solar cells and wind turbines are examined as well, but the repayment time for solar cells are too long at the moment. The repayment time for solar cells varies between 42 - 75 years, while the expected lifetime is 25 years. Concerning ventilation, a reduced ventilation of 10, 20, 30, 40 and 50 % have been examined. With only reduced ventilation the demands on low energy houses could not be matched, but it was possible in two cases with the use of solar panels. The usage of a wind turbine meant that the ventilation had to be reduced even less to match the demands on low energy houses. The repayment times for the solar panels and the wind turbine are both around 14 years. 

  • 263.
    Björk, Folke
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Angående utlovade effekter av bestrykning med Termoskydd2011Inngår i: Bygg & teknik, ISSN 0281-658X, nr 5, s. 54-55Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 264.
    Björk, Folke
    KTH, Tidigare Institutioner, Byggnader och installationer.
    Ett fast installerat system för lokalisering av läckor i tätskikt på terrasser2004Inngår i: Bygg & Teknik, ISSN 0281-658X, nr 4Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 265.
    Björk, Folke
    KTH, Tidigare Institutioner                               , Byggvetenskap.
    Fast installation av utrustning för läcksökning på terassbjälklag: En möjligthet att undvika problem i byggprocessen och förvaltningsprocessen2004Rapport (Annet vitenskapelig)
  • 266.
    Björk, Folke
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Smart homes - ett EU-projekt inriktat på energitjänster2005Inngår i: Bygg& teknik, ISSN 0281-658X, nr 5, s. 58-62Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 267.
    Björk, Folke
    KTH, Tidigare Institutioner, Byggnader och installationer.
    Spelar kulören på takytan roll för kylbehovet i en byggnad?2004Inngår i: Bygg & Teknik, ISSN 0281-658X, nr 4Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 268.
    Björk, Folke
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Takguide2005Rapport (Annet vitenskapelig)
  • 269.
    Björk, Folke
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Vad en grönyta kan betyda för tätskikts beständighet på låglutande tak2005Inngår i: Bygg & teknik, ISSN 0281-658X, nr 4, s. 27-30Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 270.
    Björk, Folke
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Jóhannesson, Gudni
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Oberoende energiexpert, vad skall en sådan kunna?2006Inngår i: Bygg & teknik, ISSN 0281-658X, nr 5, s. 57-61Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 271.
    Björk, Folke
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Lövgren, Julia
    Mattsson, Sara
    Montage av fönster i kvarteret Blå Jungfrun: platsgjutna flerbostadshus med passivhusteknik2009Inngår i: Bygg & teknik, ISSN 0281-658X, nr 8, s. 52-53Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 272.
    Björk, Folke
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Molinari, Marco
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Exergi - en kvalitetsfråga2009Inngår i: Bygg & teknik : Sveriges äldsta byggfacktidning, ISSN 0281-658X, nr 5, s. 17-20Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 273.
    Björk, Folke
    et al.
    KTH, Tidigare Institutioner, Byggvetenskap.
    Oba, Koichi
    KTH, Tidigare Institutioner, Byggvetenskap.
    Fogningsteknik för Mekaniskt Infästa Taktäckningar av Polymermodifierad Bitumen1995Rapport (Annet vitenskapelig)
  • 274.
    Björk, Folke
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Vrana, Tomas
    Forskningsarbete vid Byggvetenskap på KTH: Frost och kondens i mineralull2008Inngår i: Bygg & teknik : Sveriges äldsta byggfacktidning, ISSN 0281-658X, nr 2, s. 57-60Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 275.
    Björk, Fredrika
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Historisk-filosofiska fakulteten, Konstvetenskapliga institutionen.
    Tiden är kommen: En studie av 1960-talets tegelfasader med Mjölkuddskyrkan, Luleå Stift, som exempel2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Syftet med detta examensarbete är att undersöka olika källor för att ge en bild av villkoren för 1960-talets tegelfasader, både vid tillkomst och idag. Målet är att undersöka möjligheterna för långsiktigt bevarande av de byggnader som uppfördes under Rekordåren. Frågeställningarna lyder: Vilka tankar fanns kring byggnaders livslängd när Rekordårens byggnader uppfördes? Vilka fasadmaterial var vanliga för rekordårens bebyggelse och vilka skador uppvisar de idag? Vilka restaureringsåtgärder har genomförts på Rekordårens tegelfasader och med vilket resultat? Hur ser möjligheterna ut för långsiktigt bevarande när det gäller kulturhistoriskt värdefulla byggnader från denna tid? Dessa frågor ställs i syfte att vara till hjälp vid förståelse för byggnader aktuella för reparation nu och i framtiden. Genom arkiv- och litteraturstudier, intervjuer och besök undersöks frågan omunderhållsbehovet av ett materiellt kulturarv i anslutning till frågan om villkoren för kulturobjektets tillkomst, vård och fortlevnad.

  • 276.
    Björk, Martin
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Processen att framställa en funktionell galleria: Klöverns kommunikation med involverade parter under processen att starta upp Postgallerian2008Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This report is about the communication between the real estate owner and the other involving parties under the project of establish a successfully mall in Västerås, Sweden. The purpose of this report is that the reader will get a survey of how the communication have been between the real estate’s owner Klövern, the tenant who already lives in the building and the ones how are interesting of moving in to the new mall named Postgallerian. Hopefully it will lead to inspiration of how you could carry out the communication to the involving parties under a project who occur in a real estate where their already are some tenant´s renting. The report starts whit a summary of why and how the project start. Interviews have been done with everybody who rents in the building under the building project occurred to get an insight of what they experience when a big rebuilding occurred in the house they rent in. A summary of these interviews are in the report along with some suggestion of how a god relationship can establish whit tenant´s who rent in the building your about to do some rebuilding in. Contact have also establish with companies who wanted to rent an area in Postgallerian but for some reason didn’t do it and with the once who sign the contract and moved in. Analyses of why some of the companies decided to rent and some didn´t are discussed in the report. In this project Klövern decided to hire a consult how helped them to find candidates for renting in Postgallerian, analyze if that was a good or bad decision is in this report. It also brings up what the difference is between the consult and Klöverns way of finding companies how are interesting in renting in Postgallerian.

  • 277.
    Björkholdt, Jan
    Mälardalens högskola, Akademin för innovation, design och teknik.
    jFunda2010Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Kadesjös Ingenjörsbyrå AB, ett konsultföretag inom bygg- och VVS-sektorn med ca 50 anställda, använder ett egenskrivet BASIC program i DOS för beräkning av grundfundament i betong med grundsula och plintskaft avseende stabilitet och erforderlig armering. I dagsläget finns det ungefär 10 användare av programmet.

    Några kända problem med programmet är att varje dator måste konfigureras manuellt med kommandopromptens NET USE kommando. Detta för att en anslutning av nätverksskrivaren till den lokala porten LPT1 måste finnas för att utskriften ska fungera. Dessutom kan varken indata eller resultat från ett fundament sparas.

    Detta examensarbete behandlar arbetet för att konvertera det äldre DOS programmet till ett modernare fönsterbaserat programspråk med möjlighet att kunna spara fundamenten för respektive projekt.

  • 278.
    Björklöf, Sune
    Linköpings universitet, Ekonomiska institutionen. Linköpings universitet, Filosofiska fakulteten.
    Byggbranschens innovationsbenägenhet: En studie om den svenska byggbranschens inställning till innovationer och branschens beredskapatt hantera innovationsfrågor1986Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    The attitude of the building sector towards innovation and its intellectual and organizational preparedness for dealing with the issues of innovation is the aim of this study. The core question can be formulated as follows: Why does a building company accept certain innovations but not others? The fundamental ideas of the study are rooted in the central European tradition of the historico-qualitiative school of thought. Another basic idea for the thesis is Dewcy’s and Bcntley's theory of transactional cognition introduced in Sweden by Hanssen under the term ""field concept" according to which the content and object of knowledge are seen as an entirety. The reason for approaching the problem qualitatively. that is through not highly structured interviews based on the author's long personal experience in the sector, is its compound and many face ted nature a long with the fact that verbal discussion is firmly grounded in building sector tradition.

    Innovations has to pass trough three different filters. These filters are at the point where the innovation enters the company, during the bid preparation process and upon the absorption of the innovation into the project. Important factors influencing the passage through these filters arc papyrophobia, the old boy network (OBN) and the structure of the production system. Papyrophobia is expressed in a general reluctance to deal with theoretical issues and documentation. OBN denotes an informal communication network. Production is run by and within project organizations. i.e. repetitive ad hoc aggregates independent of the parent organization. These factors in combination with time and financial pressure obstruct the possibility of creating a research tradition.

    Characteristic features of the socio-cultural tradition of the sector are that it is male dominated, that the educational system classifies those working in the field according to trade and profession, and that the strong position of production aspects have brought to the forefront the energetic practitioner. His values are strictly professional. Information is to a great extent transmitted orally. There is strength in the ability of Swedish construction firms to plan and improvise within an established frame. However, a certain streak of marginalism with the potential of inhibiting innovation does exist in their pattern of action. Also typical of the tradition is the ideal of the free entrepreneur and the organization of large companies as confederations of a number of small and medium size firms. Finally, a fundamental cultural feature of the construction industry is openness. News spreads rapidly to a competitor.

    Innovations are disseminated in several ways, but one dominant pattern persists that cannot be seen in other industries. While the projects are important for testing and diffusion of innovations, the companies arc more intrumental in propagating information of innovations. The building materials industry's R&D work follows a pattern similar to that of production companies in other sectors.

    The building sector's readiness to follow and work with innovation issues can generally be rated as low. The confinement of interest to production aspects combined with the marked open· ness provides ample room for the materials manufacturers and companies outside the sector to introduce new products and materials. In the long run, it is the gradual change in this assortment that will transform building techniques and technology. Change is generated by other sectors.

  • 279.
    Björkman, Amelie
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Hur uppnår vi god inomhusmiljö i förskolan idag?2014Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    Abstract:

    This thesis work has been conducted at the Real Estate Department in Halmstad.

    The department consists of a construction/project management-unit and an operation/management-unit.

    Like many other towns in Sweden, Halmstad has had a long lasting problem with indoor environment. Not at least at their preschools.

    Today they are constructing from current building regulations. They have learned from negative experiences which have occurred in the indoor environment in older buildings.

    Focus is now on healthy materials, like low emission value, energy efficiency and optimization of the building, but still with soft parameters such as cleaning, interior and choice of materials.

    The fixtures is provides by the real estate department and the furnishings are provides by the children and youth administration. Together they are trying to provide a great indoor environment.

    I have, together with the real estate department and the children and youth administration of Halmstad, investigated how to provide a good indoor environment in the preschools with small funds.

    In my thesis there is one theoretical part with a questionnaire survey of how the preschool staff is experiencing their indoor environment to determine where the problems often start. And a practical part with measurements to try and come down to a result that analysis the cause of the problems and also to make sure that the ventilation systems are fulfilling projected values.

    The measurements and the questionnaire surveys was made at Lokes preschool in Frösakull, Askens preschool in Oskarström and Gullbrandstorps preschool.

    There were some differences between the staff-responses at the three different preschools.

    At Askens preschool they feel that the premises are cleaned poorly.

    At Gullbrandstorps preschool they feel that the indoor-air is bad because they can´t open the windows. The only common factor is the problems they have with the noise the children makes, which unfortunately is normal and specific for the activity.

    The particle measurement shows that Askens preschool is the one with the most particles in the indoor-air, which can be the results of poor cleaning och materials that are hard to clean.

    The airflow measurements didn´t show any unusual values, at those preschools where the measurements went well.

  • 280.
    Björling, Mikael
    et al.
    Högskolan i Gävle, Institutionen för matematik, natur- och datavetenskap, Ämnesavdelningen för naturvetenskap.
    Stymne, Hans
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.
    Mattsson, Magnus
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.
    Blomqvist, Claes
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.
    Ventilation measurements combined with pollutant concentration measurements discriminates between high emission rates and insufficient ventilation2007Inngår i: IAQVEC 2007 Indoor Air Quality Ventilation and Energy Conservation: sustainable Buildings. P. 2, 2007, Vol. 2, s. 393-400Konferansepaper (Fagfellevurdert)
    Abstract [en]

    High local concentrations of a pollutant can be the result of high local emission rates of the pollutant or insufficient ventilation. Using tracer gases to map the ventilation in multi-zone buildings combined with measurements of the local pollutant concentration provide the means to discriminate between these causes. In a similar manner, the propagation rate of pollutants from a source to a target zone and the emission rate of the pollutants at the source may be determined quantitatively.

    The paper presents both the theoretical framework for the techniques and experimental examples of the proposed methods.

  • 281.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    An engineering perspective on lean construction theory2008Inngår i: IGLC 16 Proceedings: 16th Annual Conference of the International Group for Lean Construction / [ed] Patricia Tzortzopoulos; Mike Kagioglou, University of Salford, U.K. , 2008, s. 15-26Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The diversity of Lean Construction research and applications is extensive. Due to this diversity, it can be argued that Lean Construction theory has been overextended and lost some of its fundamental ideas. Even though much theoretical progress has been achieved, theoretical development shows inadequate relation to practical construction. Therefore, theory development is of limited interest for the construction community. The aim of this paper is to make Lean Construction more accessible for construction participants who are interested in learning more about the advances of Lean Construction theory, but are unable to do so due to the vast availability of associated theories. The view of the engineer, representing such a construction participant, is used to revivify and organise Lean Construction theory  through a classic structural engineering problem, the column-buckling case. Similar to the engineering case, the delivery team should consider four dimensions when designing a stable production system; these dimensions are product standardisation, process standardisation, workload reduction, and organisation strength. Application of these aspects in a systematic manner has potential to reduce variation while improving system stability and control.

  • 282.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    An exploration of lean thinking for multi-storey timber housing construction: contemporary Swedish practices and future opportunities2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Construction is affected by a large amount of waste (up to 35% of production costs in Sweden) and adverse relationships which lead to low quality and profitability. In Sweden, industrialized construction is viewed as one solution to the issues of construction which has led to a number of development efforts. Based on the success of Lean Production in manufacturing and the development of Lean Construction in countries such as Denmark, England and USA, the application of Lean Construction is currently debated in Sweden. However, Lean Construction theory seems unable to explain the development of industrialization in Swedish construction. Consequently, there is need of further research on how to better match industrialized construction with Lean Construction theory. The aim of this research is twofold; 1) explore how Lean Construction theory can be used to gain a deeper understanding of Swedish multi-storey timber housing construction and 2) explore how an understanding of contemporary practices can help extend the theory of Lean Construction to better facilitate research on industrialized construction. Currently, there is a Swedish governmental investment campaign supporting development of timber housing construction. Consequently, this is a good opportunity to explore the applicability of Lean Construction. Based on an understanding of the Lean philosophy, contemporary Swedish timber construction practices are analysed through three case studies; element prefabrication, volume prefabrication, and an initiative combining volumes and elements. The driving force in the development of applications for Lean Construction is production system design for increased control over construction events - stability (reliability) and better control (predictability) are sought through the reduction of variety in working practices, supply chains, etc. Consequently, improving work flow is the primary target of Lean Construction. An analysis of the contemporary timber element prefabrication reveals three main issues; 1) complicated design decisions, 2) poor design documentation, and 3) deficient production planning which, from a Lean Construction perspective, obstruct work flow. However, the root cause of work flow issues is identified as a lack of value management which causes ripples all through the production system resulting in variety and poor control. Results from volume and volume/element prefabrication indicate that value management greatly improves production system design. These well-defined technical platforms, so called ‘product offers', represent a new way of thinking in the delivery of value for multi-storey housing construction. The Lean characteristics of the ‘product offer' are product specifications based on customer value, value stream management through specific resources and activities, management of value-adding activities for flow, flexibility to customer demands enabling pull, and transparency for continuous improvements (perfection). Based on these characteristics, the ‘product offer' is viewed as one possible change-agent in the adoption of Lean Construction for Swedish multi-storey housing construction.

  • 283.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Industrialiserat byggande möter Leant byggande2007Inngår i: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, nr 2, s. 12-16Artikkel i tidsskrift (Annet vitenskapelig)
  • 284.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    LWE goes Japan: En resa i hållbarhetens tecken2011Inngår i: Samhällsbyggaren, ISSN 2000-2408, nr 2, s. 22-25Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 285.
    Björnfot, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Modular long-span timber structures: a systematic framework for buildable construction2004Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    One of the identified reasons for the low amount of timber construction in Sweden is a general lack of knowledge about timber engineering and how timber can be used to its full advantage. One way for increased timber construction is the development of a cost-efficient and easy to comprehend building system. Efficiency in construction has recently been under hot debate following the success of lean production in the manufacturing industry. Therefore, the attention of construction has been directed towards the manufacturing industry in an attempt to learn successful methods. Three main principles, modularity, lean construction, and buildability, emerge as potentially useful in order to streamline construction. The aim of this research project is to create a knowledge- based framework for long-span timber construction. This framework should be able to store knowledge and experience about timber construction as well as aid in the design and production of buildable timber structures. A buildable structure is here defined as a structure constructed in competition with all other materials and sub-system choices, i.e., by this definition a constructed structure is buildable and therefore competitive. The research is based on a case study of the design and production of long- span timber structures performed at a Swedish design company. The case study includes interviews, and a survey of 60 constructed long-span timber structures. A literature review of the industrialisation principles reveals that modularity has been a key concept in the evolution of the manufacturing industry. Therefore, the long-span timber construction industry should emit a bottom-up view where product modularity guides the construction processes. A systematic framework, Experience Feedback System (EFS), is created to store buildable construction knowledge based on modularity. The EFS is based on two distinct systems; Experience Based System (EBS), and Construction Knowledge Database (CKD), connected by a feedback loop for buildable construction feedback. The EBS utilises neural network theory containing competitive knowledge and experience of long-span timber structures, providing aid in early design. The CKS is based on the Design Structure Matrix (DSM), providing management of innovative construction and aid in detailed design. Due to the adaptability of neural networks and the developed 3-D DSM hierarchy representing the structural system, the systematic framework is potentially useful for the design and development of other types of structures and materials choices in the future.

  • 286.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Bildsten, Louise
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Erikshammar, Jarkko
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Haller, Martin
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Simonsson, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Lessons learned from successful value stream mapping (VSM)2011Inngår i: Proceedings of IGLC-19: 19th Conference of the International Group for Lean Construction / [ed] John Rooke; Dave Bhargav, Lima: Fondo Ed. Pontificia Universidad Católica del Peru , 2011, s. 163-173Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    To improve, it’s crucial to see! Vital characteristics of Lean are visualisation and transparency, i.e. allowing everyone to see all what occurs in production. A common tool for this purpose is Value Stream Mapping (VSM). Due to varying flows, performing a successful VSM in construction confers additional challenges. In this paper, lessons learned from successful VSM studies in construction are provided.Three VSM case studies were performed at different companies ranging from patio door manufacturing to kitchen cabinet assembly. Lessons learned can be structured into three phases; preparing the VSM (selecting “value stream leaders” and VSM team, clarifying values, etc.), performing the VSM (use of mapping tools, approximation of key indicators, waste identification, etc.), and following-up the VSM (Plan-Do-Check-Act, evaluating customer values, etc.).For the involved companies, the lessons learned imply the start of a “Lean journey” even though the involved companies found it difficult to relate VSM improvements to business strategies. Consequently, there are opportunities to further improve the application of VSM. However, it’s important to remember that VSM is about the straight-forward visualisation of flows and that these flows are made transparent for the whole organisation.

  • 287.
    Björnfot, Anders
    et al.
    Faculty of Technology, Economy and Management, Gjøvik University College.
    Johnsson, Helena
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Simonsson, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    'Find-think-write-publish': Lean thinking in scientific paper writing2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Construction research supports long-term development of the construction industry and the society. Thus it is important to evaluate research against existing knowledge and to constantly develop new knowledge. The main mechanism for doing so is publishing scientific papers. In Sweden, praxis has developed that a Ph.D. consists of a handful of scientific papers. The average time period for a Ph.D. is five years after which the funding situation changes drastically. Previously, the duration of Ph.D. studies at Luleå University of Technology, Sweden often exceeded the planned five years, disrupting the flow of Ph.D. examinations. To increase awareness and interest in paper writing, a method was sought to visualise and manage the writing process. This paper investigates how an Oobeya room can be implemented in construction research to support paper writing. Experiences of working with the Oobeya room in three separate research divisions prove that it is possible and fruitful to better manage knowledge in academic institutions. Even though research is creative, it can be properly managed without hampering scientific freedom. Evidence from managing scientific paper writing using the Oobeya room shows that proper management of research will actually create better research that is more publishable with shorter lead times!.

  • 288.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Jongeling, Rogier
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Application of line-of-balance and 4D CAD for lean planning2007Inngår i: Construction Innovation, ISSN 1471-4175, E-ISSN 1477-0857, Vol. 7, nr 2, s. 200-211Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose - The purpose of this paper is to suggest the application of the line-of-balance (LoB) scheduling technique in combination with a 4D CAD workspace model as a method to improve the management of the flow of resources through locations in construction projects, defined as work flow. Current scheduling methods fail to consistently manage work flow, which can disrupt the construction process, leading to waste such as conflicts in time and space by construction crews. Design/methodology/approach - LoB and 4D CAD are applied to a case study of multi-story timber housing project involving the construction of 95 apartments in five six-storey buildings. Based on the case study results, the benefits and limitations of the combined use of both methods are discussed. Findings - The majority of the problems experienced during the actual construction process quickly become evident from an analysis of a relatively simple LoB diagram. Furthermore, the 4D CAD workspace model provides additional insights in the scheduling of construction activities, such as workspace availability, the spatial context of workspaces and partial overlap of workspaces. Practical implications - Virtual design and construction methods based on principles from lean construction can contribute significantly to the value of the product and the elimination of waste in any construction project. Originality/value - The paper refers to the guiding principles from lean construction in relation to virtual design and construction methods, such as simulations with 4D CAD. Additional research and studies of practical applications are suggested to facilitate the combination of principles from lean construction with virtual design and construction methods.

  • 289. Björnfot, Anders
    et al.
    Lennartsson, Martin
    Stehn, Lars
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriellt och hållbart byggande.
    Lindbäck, Hans
    Lindbäcks Bygg, Sverige.
    Projekt: Installationssamordning2010Annet (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Projektet syftar till att arbeta fram en modell för hur modularisering kan utnyttjas praktiskt i byggsammanhang. Specifikt handlar det om att definiera och avgränsa moduler samt att redogöra för hur en teknisk plattform kan skapas som stöds av en individuell utveckling av moduler för tekniska installationer. Medverkande parter Universitet: Luleå tekniska universitet (LTU) Företag: Lindbäcks Bygg AB Norvag Byggsystem AB Moelven ByggModul AB Setra Group AB Martinsons Byggsystem AB

  • 290.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Sardén, Ylva
    Prefabrication: a lean strategy for value generation in construction2006Inngår i: Understanding and Managing the Construction Process: Theory and Practice: Proceedings of the 14th Conference of the International Group for Lean Construction / [ed] R. Sacks; S. Bertelsen, Catholic University of Chile, School of Engineering , 2006, s. 265-277Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Despite a number of attempts to establish prefabrication as a Lean Construction method, there is still confusion of what prefabrication provides to the management of the construction process. It seems as if prefabrication can provide a means of dealing with value stream fluctuations in highly complex situations, such as a traditional construction project where it is difficult to define client value accurately. The prefabrication decision and the strategies for meeting customer demands have been studied for three Swedish producers of prefabricated timber components for multi-storey housing construction.The case study results indicate that the Swedish construction industry is slowly changing from a traditional project based generation of customer value to offering specific products, adaptable by the customer to suit their own view on value. A prefabrication strategy where a well defined and tested product is offered to customers has the effect of redistributing resources from the design process to the value stream. Such redistribution enables companies with a well developed prefabrication strategy to better control the value stream and to implement new and better ways of meeting customer requirements while continuously improving their work and eliminating waste.

  • 291.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    A design structural matrix approach displaying structural and assembly requirements in construction: a timber case study2007Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 18, nr 2, s. 113-124Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A fundamental demand of construction design is human safety from structural failure. As a consequence, buildings generally tend to be structurally optimized with cost as the main target parameter. However, a cost-suboptimized structural design often leads to poor constructability decisions with subsequent waste. This paper presents initial research in the development of a design structural matrix (DSM) method able to identify constructability obstacles between structural design and assembly and thus eliminate waste. Empirical data based on a case study of long-span timber structures is used in the development and analysis of the method. The DSM was found to be a holistic tool for systematic consideration of structural design and constructability requirements by providing a standardized system view, a detailed element view, and physical and functional interactions among elements and modules. The DSM was also shown to aid in detailed design and production management through the use of simple matrix tools.

  • 292.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    A systematic framework for long-span timber structures2004Inngår i: Proceedings, The 8th World Conference on Timber Engineering: WCTE 2004, 2004, Vol. 1, s. 93-98Konferansepaper (Fagfellevurdert)
  • 293.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    Industrialization of construction: a lean modular approach2004Inngår i: 12th Conference of the International Group for Lean Construction: proceedings of IGLC-12 : Helsingør, Denmark, August, 3-5, 2004 / [ed] Sven Bertelsen; Carlos T. Formoso, 2004Konferansepaper (Fagfellevurdert)
  • 294.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    Product design for improved material flow: a multi-storey timber housing project2005Inngår i: Proceedings: 13th Conference of the International Group for Lean Construction / [ed] Russell Kenely, Sydney: International group for lean construction , 2005, s. 297-306Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Understanding of construction has evolved to include a deeper understanding of its mechanics; in addition to traditional on-site work involving the manufacturing of building products - industrial construction. One of the most important aspects of any industrial process is flow of materials and resources. Using empirical data from a unique multi-storey timber housing project, this paper aims at building a better understanding of how product design affects flow of materials in housing construction. Even though a high degree of prefabrication was used in the project, the amount of complementary site work caused delays, complaints, and a slow learning cycle. A standardization process was used to shift product 'know-how' from person to product, resulting in increased flow and a reduction of errors. Prefabrication was not the sole solution to the encountered problems, but the controlled and ordered environment in prefabrication provided solutions at early stages. Instead of working towards solving the main production issues, the management was instead observed working with minor changes (first-aid solutions) to control flow. If industrialized multistorey timber housing construction is to be successful, product design decisions should be thought through, thoroughly, from start to finish using standardization as a guiding star

  • 295.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Stehn, Lars
    Value delivery through product offers: a lean leap in multi-storey timber housing construction2007Inngår i: Lean Construction Journal, ISSN 1555-1369, E-ISSN 1555-1369, Vol. 3, nr 1, s. 33-45Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Among large Swedish contractors there is currently a specialization trend towards an increased use of prefabrication and complete systems in housing construction. The Lean Construction development up to date has focused on the management of value delivery for complex construction projects. Typical Swedish housing projects do not experience this broad complexity; instead the main challenge seems to be to better specify and deliver customer value. Currently, the Lean Construction methods available are not by themselves enough for the generation of value in Swedish multi-storey housing construction. The aim of this paper is to examine the potential of the product offer (a well-defined and highly standardized building system developed from the value views of specific customers) as an aid in the generation and delivery of value for multi-storey timber housing construction.From the point of view of manufacturing and customer value, the product offer is considered a Lean strategy for integrated consideration of internal and external value. Case study experiences indicate that the product offer strategy provides stability and continuity for producers that in turn provides with Lean practices in marketing, design and manufacturing. Approaching Lean, small- to medium-sized Swedish producers should focus on improvements through Lean Manufacturing. However, since an emerging demand from the Swedish construction industry forces these producers to take a larger role in the construction process, more construction related Lean improvements must also be considered. In this regard, the product offer is demonstrated to be a promising Lean strategy for the Swedish housing industry.

  • 296.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Torjussen, Liv
    Gjövik University College.
    Extent and effect of horizontal supply chain collaboration among construction SME2012Inngår i: Journal of Engineering, Project, and Production Management, ISSN 2221-6529, E-ISSN 2223-8379, Vol. 2, nr 1, s. 47-55Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The majority of companies involved in value delivery in the Swedish housing industry are Small- and Medium-sized Enterprises (SME). An SME is often managed in an informal way with focus on sales and production. Many SME are also financially vulnerable as they are strongly dependent on a few key customers and key products. As variation will always exist, SME should learn to deal with variation instead of try eliminating it. This paper hypothesises that structural flexibility in SME supply chains through horizontal collaboration leads to a regional environment of economical growth from which all active SME will benefit. The hypothesis is examined through two case studies; a Swedish supplier network that has worked together six years and a four year old Norwegian supplier network. A benefit of collaboration is knowledge sharing that lessens the economical strain of keeping up with the “latest”. Other examples of collaboration are shared production resources in case of low capacity. Collaboration within supplier tier networks is considered to mark the emergence of a “collective strength” that improves individual suppliers bargaining position towards their customers. This evolution is considered an indication of the emergence of a “Lean Enterprise” within the house building sector.

  • 297.
    Björnfot, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Torjussen, Liv
    Gjövik University College.
    Erikshammar, Jarkko
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Horizontal supply chain collaboration in Swedish and Norwegian SME networks2011Inngår i: Proceedings of IGLC-19: 19th Conference of the International Group for Lean Construction / [ed] John Rooke; Dave Bhargav, Lima: Fondo Ed. Pontificia Universidad Católica del Peru , 2011, s. 678-688Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    An SME is often managed in an informal way with focus on sales and production. Many SME are also financially vulnerable as they are strongly dependent on a few key customers and key products. As variation will always exist, SME should learn to deal with variation instead of try eliminating it. This paper hypothesises that structural flexibility in SME supply chains through horizontal collaboration leads to a regional environment of economical growth from which all active SME will benefit The hypothesis is examined through two case studies; a Swedish supplier network that has worked together six year and a freshly started Norwegian supplier network. The Swedish suppliers are cooperating; e.g. in case of low capacity, they are sharing production resources. Another benefit of cooperation, supported by Norwegian findings, is the sharing of knowledge amongst each other that lessens the economical strain of keeping up with the “latest”. Cooperation within supplier tier networks marks the emergence of a “collective strength” improving individual suppliers bargaining position towards their customers, e.g. when obtaining new orders, when lobbying for changes in regulations, or when developing and verifying new products. This evolution indicates the emergence of a “Lean Enterprise” within the house building sector.

  • 298.
    Bjöör, Henrik
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Anpassning av passivhus för ett kallare klimat - teknisk och ekonomisk analys2008Independent thesis Basic level (professional degree), 20 poäng / 30 hpOppgave
  • 299.
    Bjöör, Tomas
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Kempe, Tobias
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsteknik.
    Ytterväggar och bjälklag för flerbostadshus2004Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
  • 300.
    Blandine, Feneuil
    et al.
    Aalto University, Concrete Technology Laboratory, Department of Civil and Structural Engineering, School of Engineering, Aalto University.
    Habermehl-Cwirzen, Karin
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Cwircen, Andrzej
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Erratum to: Contribution of CNTs/CNFs morphology to reduction of autogenous shrinkage of Portland cement paste2017Inngår i: Frontiers of Structural and Civil Engineering, ISSN 2095-2430, E-ISSN 2095-2449, Vol. 11, nr 2, s. 255-255Artikkel i tidsskrift (Fagfellevurdert)
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