Lean methodology in design and construction
Early preparations Much is planned and prepared before the teams starts to work in a control area. Construction is almost the last thing to be done, and it should progress as smoothly and rationally as possible. In the KHiB-project the taktplan is the basis for all activities. When planning the starting point for the early preparation of the activities, one counts a defined number of weeks backwards in time from the week a task is to be carried out. Below we find some of the many activities undertaken in the preparation and planning ahead of the KHiB-construction. «System»: 14–10 weeks prior to start In the 14-10-meeting complicated designs and complex dependencies are debated. Multidisciplinary challenges are considered by the team and solutions are carefully scheduled. This includes making decisions for products with long lead times («LLI») so that they arrive on the construction site at the right time. The level of detail is basic. Participants in the meeting are primarily the designers, but also contractors with their subcontractors and specialised suppliers. In the KHiB-project the owner chairs the meeting. «Production»: 6–4 weeks prior to start Issues from the 14-10-meeting must be clarified and closed before moving into the 6-4-meeting. Weeks 6-4 before construction in a given control area, multi and single disciplinary dependencies are discussed and coordinated, and technical and practical issues are planned and resolved. The level of detail is now high. Participants in the meeting are primarily the contractors with their subcontractors and specialised suppliers. Also the designers participate. In the KHiB-project the owner, represented by the site management, chairs the meeting. BIM model walk through The walk through is held four weeks prior to the start of production in any given control area. The KHiB-project has used Solibri, a digital tool illustrating the building in 3D. By using the 3D model the team discusses, coordinates, and clarifies the construction and technical challenges area by area. The level of detail is high and focusing on practical solutions. Participants in the meeting are primarily the various foremen together with the designers. The meeting is chaired by the BIM Site manager (a separate role).
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