Research Strategies on New Prefabricated Technology for Underground Metro Stations

Abstract

Based on the first successful application of new prefabricated technology in underground metro stations on line 2 of the Changchun Metro in China, a comprehensive analysis and discussion on research strategies for new prefabricated technology for large underground structures is provided. This paper introduces the application status of prefabricated technology in underground engineering worldwide, illustrates the different characteristics of prefabricated technology applied to ground buildings and underground structures, puts forward the key technologies, and compares the major technical, economic, and social benefits achieved. The successful application of prefabricated technology for underground structures in Changchun Metro demonstrates the feasibility and great advantages of the new prefabricated technology for underground engineering.

Keywords

Metro station / Prefabricated technology / Monolithic precast concrete structure / Superimposed prefabricated integral structure / Fully prefabricated structure / Rebar splicing by grout-filled coupling sleeve / Grouted mortise–tenon joint / Closed-cavity thin-walled components

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Funding

Chinese National Key S&T Special Projects(2017YFB1201104)