A Method and Structure for Subway Station Expansion in Soft Ground Based on Inserting and Freezing Method

Abstract

The invention provides a method and structure for expanding a subway station on soft ground based on a beam-inserting and freezing method, which includes a shield tunnel, an intermediate platform connected between two parallel shield tunnels and communicated with the shield tunnel, and wrapped in Frozen soil layer outside the middle platform; the middle platform includes top lining unit and bottom lining unit, side columns and structural floor. The top lining unit and bottom lining unit are arranged between shield tunnels and are vertically symmetrical. The arched outer surfaces of the lining unit and the bottom lining unit are arranged; the two ends of the bottom lining unit and the top lining unit are connected and supported by side columns; the structural bottom plate is set above the bottom lining unit and kept at the same level. The invention solves the problem that the large deformation of the subway and the surrounding soil is caused by serious ground breaking in the expansion mode, and the invention has the advantages of high construction efficiency, short construction period and high safety.

Description

technical field [0001] The invention belongs to the technical field of geotechnical construction, and in particular relates to a method and structure for expanding a subway station on soft ground based on a beam-inserting freezing method. Background technique [0002] The shield tunneling method has become an important construction method in the construction of subways in my country, and has become a preferred method. However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization. [0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main s...

AI Technical Summary

Problems solved by technology

However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization

[0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main structure of the existing subway station, which mainly uses a plurality of dewatering well pipes to carry out dewatering construction until the groundwater under the floor is reduced to the design depth. In the widening construction, the underground enclosure structure is supported by the force conversion method of slabs instead of braces. However, this expansion method seriously breaks the ground, which will cause large deformation of the subway and the surrounding soil, and may even cause stratum subsidence and existing Sabotage of operating subways, resulting in major safety incidents

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