Research on prefabricated metro station structure and key assembly technologies

In the severe cold environments of northern China, the inability to conduct open excavation for underground structures during winter often results in extended construction period. To solve the problem of not being able to carry out construction in winter, engineering system research and application of prefabricated assembly construction technology for metro stations have been carried out since 2012 on Metro Line 2 in Changchun, Jilin Province, China. This paper provides a brief introduction to the prefabricated metro station structure system and highlights the key technical achievements in the research and application of prefabricated assembly construction technology for metro station structures over the past decade. These achievements mainly include joint connection technology, key design technology for closed-cavity thin-walled components, structural mechanical behavior and calculation methods for prefabricated stations, structure assembly design methods, and key waterproofing technologies for joints. Engineering practice has demonstrated that prefabricated assembly construction technology for metro station structures offers advantages such as high quality, high efficiency, safety, and environmental protection. This technology is not only suitable for the construction of metro stations in various environmental conditions in other cities but also for the construction of metro sections, pedestrian passages, road tunnels, underground pipe galleries, and other cut-and-cover underground structures. With its wide applicability, this technology provides significant technical, economic, and social benefits.