Barrier Clearing Technology for Metro Station Auxiliary Structure Construction

Abstract

Objective With continuous improvement of urban metro construction technology, the auxiliary structures of metro stations are getting closer to the existing buildings or structures, and the soil nails and anchor rods used for slope support of the existing buildings or structures unavoidably conflict in space with the auxiliary enclosure structure. Therefore, it is necessary to choose a proper barrier clearing technology scheme to remove the existing barriers and ensure smooth construction of the auxiliary enclosure structure. Method Based on the experience and current situation investigation of the barrier clearing in the construction of urban metro station auxiliary structures，the commonly used barrier clearing technologies against soil nails and anchor rods are summarized. Four barrier clearing schemes for metro station auxiliary structure construction are put forward in combination with the main barrier clearing technology against soil nails and anchor rods. Combined with the engineering practice, the 4 schemes are compared and analyzed from the aspects of their advantages and disadvantages, cost, construction period, pile quality and safety, etc. Result & Conclusion On-site implementation in the project shows that the full rotation barrier clearing is more effective, and with the steel sleeve wall protection, the pile quality is good. With the good waterproof effect of SMW(soil mixed wall)pile in foundation pit excavation, all deformations of the foundation pit can be within the controllable monitored range. Therefore, in the construction of the metro auxiliary structure, using the construction technology scheme of the full rotation barrier clearing and SMW pile can achieve relatively good engineering and economic results.

Keywords

• metro
• station auxiliary structure
• soil nail and anchor rod
• barrier clearing technology