Journal of Engineering Research

The renovation of the subway signal system is being carried out under the condition of uninterrupted operation of existing lines, and the construction organization is facing multiple challenges such as limited space, compressed time periods, and high system coupling. In the context of dense train operation, any construction disturbance may be amplified as operational risk. Therefore, it is necessary to coordinate construction windows, equipment switching strategies, and multi-disciplinary collaboration mechanisms while ensuring train safety. Through the analysis of typical renovation scenarios, key difficulties such as unclear construction boundaries, high difficulty in risk assessment, and complex emergency chains can be summarized. An organizational approach centered on refined planning management, phased cutover plans, and highly reliable temporary support systems is proposed to enhance the controllability and safety margin of construction organization under non-stop conditions.

Subway signal system; Non-stop construction; Line renovation; Construction organization; Risk control