Byggbarhet hos vindkraftverksfundament: Förslag till effektivisering av produktionen för vindkraftverksfundament
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Construction of windmill parks has increased heavily in Europe and Sweden. The expansion has forced building companies to make their production more effective for this type of project. Previous studies have shown that introduction of industrialized methods for onsite production of concrete constructions can lead to more efficient project execution. The industrialized production methods studied in this report are self compacted concrete and rebar carpets mats applied on windmill foundations. To reach a higher buildability for cast onsite concrete constructions, good cooperation with the designer early in the project is needed to affect the design in support of more industrialized production method. Good communication between the client, the designer, the contractor and the subcontractors are also needed to achieve buildable design for efficient production. As a result, better working environment, a better choice for suitable production methods and economical savings for the entire project can be achieved. The purpose of this thesis is to study production methods such as reinforcement montage that can lead to higher production capacity for the construction of windmill foundations. The study includes the analysis of production methods used today and of methods that can lead to a better buildability and efficiency for the production process.First a literature survey was conducted to collect background information of the problem and identify suitable production methods and designs for gravity windmill foundations. An onsite study over reinforcement montage was made in Jädraås windmill park and in Solberg windmill park outside of Örnsköldsvik. The collected information has been analyzed and different production methods and design solutions have been compared.The result from the study shows that the industrialized methods of self compacted concrete and reinforced carpet mats leads to a higher buildabilty for windmill foundations. The introduction of self compact concrete will eliminate the heavy vibration moment from the casting operation. Hence, fewer workers will be needed during the casting operation, implying that the reinforcement of next windmill foundation can start earlier. Self compacted concrete is financially efficient for windmill parks when a large amount of windmill foundations shall be constructed and/or when the time for the project is tight. Rebar carpets mats can replace about 50 percent of the total reinforced amount used in foundation, which also leads to a decrease of 47 % of the working time for the reinforcement montage. However, the material cost will increase which has to be taken into account and compared with the decreasing amount of work.Windmill foundations have different designs. In this study a square shaped and an octagonal shaped foundation are compared to identify which of the designs that will be the most effective to produce. The foundations are not completely comparable since the foundations have different requirements for the different shapes. The conclusion that can be drawn from this study is that the square shaped foundation has a simpler design better buildability than the octagonal shaped foundation. However, the octangonal shaped foundation is more efficient regarding the use of material. Therefore, it is difficult in forehand to whether the higher material cost of the square shaped foundations is balanced by the decreasing amount of working hours. Thus, the design should consider the material costs and resources available when the project is launched.Communications between the actors of the project are accordingly important to reach a better buildability. The project needs good and clear communication with all the parts that are involved with the project. A good work environment, suitable production methods, standardizing of all the parts in the project as well as a visualization of working preparations with BIM-models are all important steps to prevent misunderstandings and make the project more efficient. Simplicity in the production will increase the efficiency in the project.
Place, publisher, year, edition, pages
2012. , 84 p.
Teknik, Byggbarhet, självkompakterande betong, rullarmering, vindkraftverksfundament
IdentifiersURN: urn:nbn:se:ltu:diva-59236Local ID: fc37afa8-3a1e-46eb-ae44-89f2f90e6838OAI: oai:DiVA.org:ltu-59236DiVA: diva2:1032624
Subject / course
Student thesis, at least 30 credits
Civil Engineering, master's level
Validerat; 20120615 (anonymous)2016-10-042016-10-04Bibliographically approved