A Multi-task Oriented Optimization Method for Urban Rail Overhaul Workflow Based on Critical Chain Method

With the expansion of the urban rail network scale, multi-tasking is becoming an inevitable trend. However, the Linear method of the workflow is still being adopted. The lack of time control leads to the low efficiency of project management, which further affects the daily operation of the metro. Regarding such a situation, this paper therefore aims to analyze the most unfavorable situation in the overhaul project arrangement of urban rail transit lines using the critical chain method. Taking the path with the longest processing time in the project as the critical path, the Critical Chain Project Management is established and calculated considering the resource constraint problem. Taking Shenzhen as an example to examine the effectiveness of the model, the results show that the critical chain method can significantly shorten the construction period and can make use of construction resources more effectively, which provides a guideline for multi-task scheduling of Urban Rail Overhaul projects.