Abstract
In Japan, the demand for wooden houses is increasing while the number of carpenters is decreasing. Therefore, it is necessary to improve productivity in wooden house construction. This has led to an increase in the use of the pre-cut method. The pre-cut method is a method in which raw materials (base woods) and joints are processed in advance based on the design. Compared to conventional methods, the pre-cut method has various advantages, such as reduced construction time at the construction site and improved processing accuracy. With the above background, we have been conducting to improve the efficiency of pre-cut lumber production factories to increase productivity in wooden construction. After processing, pre-cut lumber is packed according to a pre-determined packaging sequence to improve work efficiency at the building site. When pre-cut lumbers that do not match the packaging sequence are produced, they are temporarily stored in a space. To reduce space and production time in a pre-cut lumber production factory, we studied a practical production planning algorithm using metaheuristics that minimizes the maximum number of racks used with pre-cut lumber production company A and confirmed the effectiveness of the proposed algorithm through numerical experiments.
