4D CAD-based evaluation system for crane deployment plans in construction of nuclear power plants

The purpose of this paper is to develop a 4D CAD-based evaluation system, which calculates transitions of utilization rates automatically, for planning of crane-deployment in construction of a NPP. To calculate utilization rates automatically and accurately, two functions were developed. The first function maps data between 3D objects and carry-in tasks by using a fast geometric interference checking method based on “Axis Aligned Bounding Box.” The second one estimates installation material quantities in early construction-planning phases by using a data mining technique called “random forests.” The result of verification tests based on previous construction data indicates that the proposed system will significantly reduce the time required to create crane-deployment plans and improve their accuracies.