Method using multi-pilot-tunnel expanding excavation large-diameter shield tunnel for building subway station

Abstract

The invention relates to a method using a multi-pilot-tunnel expanding excavation large-diameter shield tunnel for building a subway station. In a single-hole double-track tunnel, pipe piece structures of the bottom and the top of a shield are reserved, and a bottom longitudinal beam, a middle partitioning beam and a top longitudinal beam of a station structure are subjected to construction. The residual station structures on the two sides of a shield tunnel are formed by expanding excavation, air flues at the two ends are used as working faces, through a separating expanding excavation construction method, station portions on the two sides of the large shield tunnel are subjected to excavation and supporting from top to bottom, structure casting of the station expanding excavation portions is completed from bottom to top, meanwhile, measures of connecting between a cast-in-place structure and a reserved pipe piece are well carried out, and a single-layer side platform subway station. According to the method using the multi-pilot-tunnel expanding excavation large-diameter shield tunnel for building the subway station, the stress mode of a structure stress system is converted from initial pipe piece annular stress into combination of a part of the pipe piece, initial-supporting stress and beam-wall stress, and the structure has the advantages that stress is clear, converting is reasonable, and construction is convenient.

Description

【Technical field】 [0001] The invention relates to a construction method of a subway station, in particular to a method for constructing a subway station by expanding and excavating a large-diameter shield tunnel with multiple pilot holes, and belongs to the technical field of rail transit engineering. 【Background technique】 [0002] The shield method is widely used in subway tunnel construction because of its advantages of high construction efficiency and good effect of controlling ground settlement. The construction of subway tunnels using the shield method and the construction of stations using the open (cover) excavation method are a major mode of subway construction at present. The existing environment will be more complex, and this construction mode faces severe challenges, which are mainly reflected in the following aspects: [0003] (1) It is difficult to coordinate the construction of the section shield and the station [0004] At present, the conventional shield i...

AI Technical Summary

Problems solved by technology

[0003] (1) It is difficult to coordinate the construction of the section shield and the station

[0004] At present, the conventional shield interval tunnels are in the form of two holes and two lines, and the stations are generally constructed by the open cut (cover excavation) method, which has the problem of frequent starting, receiving and U-turning of shield tunnels, and the construction of interval tunnels and stations interferes with each other, restricting Improve shield construction efficiency

[0005] (2) The construction conditions of station open cut are becoming more and more difficult

[0007] (3) It is difficult to arrange double-lane tunnels in narrow road sections

It is difficult to arrange double-hole and double-line section lines in areas with narrow roads and dense surrounding buildings

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