Abstract:

Sujiatang station of Kunming Rail Transit line 4 is with a shield machine driving through. Due to the influence of relocation and geological conditions, the civil construction progress lags behind the schedule. In order to meet the basic requirements of the station platform clearance caused by the passage of the following shield driving through stations and rail transport vehicles after the secondary departure, two support schemes (i.e. portal support scheme and midplate structure strengthening scheme) are put forward, which can meet the requirements of the station superstructure construction. Through theoretical analysis and finite element numerical simulation, compared the program implementation from six aspects including the basic requirements of the station construction progress, the impact on the subsequent shield construction period, the economy and so on, it is considered that the two support schemes can provide the supporting counterforce of superstructure construction. The support scheme should be chosen based on the construction schedule and the time requirement for shield driving through a station. Therefore, the investment can be better controlled and the construction is easy to satisfy the schedule requirement.

Key words: opencut station, shield machine driving through a station, doorlike scaffold, structure strengthening, scheme comparison