Vindkraftsfundament: Analys av produktionen med utgångspunkt från lean
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Investments in renewable energy has increased in Sweden in recent years as more focus is given to environmental issues and sustainable development. Wind power is estimated to increase the electricity production from the current level of 3.5 TWh to 12 TWh per year in the near future. This creates a market for construction companies to build foundations, roads, crane locations and add electrical wiring for the turbines. Both national companies and smaller specialized companies operates on this market competing to develop more efficient production methods to shortening the production time and lower the production cost in order to win tenders. The purpose of this thesis is to study how two construction companies implement the production of foundation to wind turbines. The two companies' production methods will be analyzed based on the theoretical frameworks lean, value stream mapping, standardization and learning effect. Lean is a production philosophy that originated from the Japanese motor industry and aims to minimize waste in the production in order to generate more customer value. The core idea is to maximize customer value while minimizing waste and it simply means creating more value for the customers with fewer resources. In this master thesis, two wind power projects have been studied using time studies of the various production operations in order to identify production time and time distribution of the different activities in the production of the foundation for the wind turbines. The time required for different activities has been divided into value-added time, necessary but non-value adding time and waste. The results that emerged from these studies generally show a high degree of value-adding time and small waiting times of the studied companies' operations. Wind power projects often consist of several foundations to build in a park which opens the possibility to standardize parts of their production and also take advantage of the learning effect in order to shorten production time. Two important areas for development of the production were identified - early stage involvement and planning. If the building contractor gets an opportunity to get involved early in the process the design can be better adapted to the production of the foundations. It is also important to be able to manage the large variation of required personnel for an operation and adjust staffing levels to the best possible use of resources. A good production plan and possibility to work with several foundations in the same project provides the right conditions for optimal use of resources. The study also revealed the importance of a stable external environment in order to be able to carry on production in an effective manner. This was especially evident in the second project studied where the work was affected by an uncertainty in the environment and new solutions for the construction of the foundations. This meant that the production crew was not able to perform at the normal productivity rate with a longer production time than estimated as a result.
Place, publisher, year, edition, pages
2013. , 67 p.
Teknik, Vindkraftsfundament, lean, inkörningseffekt, standardisering
IdentifiersURN: urn:nbn:se:ltu:diva-46986Local ID: 493c91e0-38ce-4298-a190-7cb3c2ca4881OAI: oai:DiVA.org:ltu-46986DiVA: diva2:1020302
Subject / course
Student thesis, at least 30 credits
Civil Engineering, master's level
Validerat; 20130120 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved