Abstract
Modular construction, which involves unit production in factories and on-site work, has benefits such as low cost, high quality, and short duration, resulting from the controlled factory environment utilized. An efficient tower crane lifting plan ensures successful high-rise modular project completion. For improved efficiency, the lifting plan should minimize the reaching distance of the tower crane, because this distance directly affects the tower crane capacity, which is directly related to crane operation cost. In situations where units are lifted from trailers, the trailer-to-tower crane distance can have a significant impact on the tower crane operation efficiency. However, optimization of this distance to improve efficiency has not been sufficiently considered. This research proposes a genetic algorithm optimization model that suggests optimized tower crane and trailer locations. The case study results show that through the proposed model, the project manager can reflect the optimal location selection and optimal tower crane selection options with minimal cost.
Highlights
Modular buildings consist of prefabricated room-sized units that are produced in factories [1]
Modular unit lifting in high-rise modular projects is considered to be important because heavy units have to be installed in dense urban construction sites
A high-capacity tower crane is used and the tower crane location cannot be modified; the tower crane location should be planned such that it can be performed with minimized operational cost
Summary
Modular buildings consist of prefabricated room-sized units that are produced in factories [1]. In stick-built construction, the major objectives of a tower crane operation plan are minimization of the operating cost, transportation time, and possibility of conflict by adjusting the weight of the material package or modifying the lifting point. In modular construction on-site work, the tower crane capacity is directly related to operational efficiency such as cost; the objective of the operation plan should focus on reducing the tower crane capacity. This is because the weight of the material cannot be adjusted as heavy units cannot be divided. The capacity affects cost more than the operational time and the total tower crane transportation distance
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