A construction method for expanding and excavating subway stations on the basis of shield tunnels in parallel sections

Abstract

The invention relates to a construction method for enlarging and excavating a subway station on the basis of a parallel interval shield tunnel. The station structure formed through enlarging and excavation is in a form of a simple support framework wall column type double-layer subway station; piles and a water stop heavy curtain or an underground continuous wall are used for blocking soil and water; the lateral deformation of soil bodies is resisted; a duct piece temporary supporter is erected in a station interval tunnel; after the excavation is performed to the bottom of a foundation pit, partial shield duct pieces are removed under the protection of a duct piece inner supporter and a temporary steel supporter between the duct pieces; bottom plates are connected with the bottoms of wall columns; connecting beams between the wall columns are stably and firmly connected with the duct pieces; waterproof treatment and connection between the wall columns and the duct pieces are performed; and a sealed stress system is formed. A construction main body provides a vertical support system for an excavation space by using constructed middle vertical posts, side walls, the wall columns and a connecting beam system between the wall columns. The method is reasonable and feasible; the operability is high; after the method is applied, huge economic benefits, social benefits and environment benefits can be brought; and important engineering application values and development prospects are realized.

Description

technical field [0001] The invention relates to a structure and a construction method for expanding and digging a subway station on the basis of a shield tunnel in a parallel section, and belongs to the technical field of rail transit. Background technique [0002] Among the many subway construction methods, the "shield tunneling method" has been more and more widely used in subway construction because of its high construction safety, fast construction speed, and relatively small impact on the surrounding environment. However, in the past construction of the interval shield method in China, the use of shields was limited to the construction of interval tunnels with a simple and single cross-section. The current shield well is hoisted out, then transferred to another shield well, and then the shield machine is reassembled for construction; or the station is expanded and excavated in advance to expand the width and bottom of the station, and then the shield machine is moved by...

AI Technical Summary

Problems solved by technology

It is mainly used to solve the problem of section shield tunneling (referring to the shield equipment used for subway section tunnels with a diameter of about 6m, and the single shield tunnel formed by its excavation to expand the subway station cannot be used to expand the subway station) under the current conditions. Too many propulsion operations and inefficient use of shield equipment

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