Abstract: The cast-in-place structures commonly used in metro stations possess disadvantages, such as long construction periods, significant environmental impact, and inconsistent concrete pouring quality. To address these issues, a study is conducted on the prefabricated station scheme used for Qingdao metro line 6, building on the scheme implemented in Changchun. The final scheme is refined by examining cross-section profiles, component thickness, blocking modes, and internal structural assemblies. The validity of this scheme is validated by comparing it with similar prefabricated station schemes. Based on the "incremental method" principle, an assembly scheme for the prefabricated station under pile support is proposed, accompanied by the development of supporting equipment and refined process controls. The research results reveal the following: (1) The prefabricated station scheme features a column-free station hall, equivalent thickness components, inverted arch blocks, and medium plate prefabrication. This design simplifies manufacturing, accelerates the assembly process, and provides a rational structural system. (2) The assembly of internal structures, such as the middle plate and longitudinal beam, expands the application scenarios of prefabricated technology, greatly improving construction efficiency. (3) The proposed pile support system assembly scheme minimizes the influence of the internal support on the component assembly and can adapt to various types of enclosure structures of Qingdao metro line 6. (4) The prefabricated station of Qingdao metro outperforms traditional cast-in-place station in terms of concrete quality, joint antileakage performance, and construction effect.

Key words: prefabricated station; cross-section selection, prefabricated middle plate, pile support system assembly