Shield-first and pipe-jacking-second up-and-down parallel overlapped tunnel structure and construction method thereof

Abstract

Provided is a shield-first and pipe-jacking-second up-and-down parallel overlapping tunnel structure. The structure comprises two tunnels which are overlapped in a soil body in an up-and-down parallel mode; the two tunnels are an upper pipe-jacking channel and a lower shield tunnel respectively; and the channel center line of the upper pipe-jacking channel and the tunnel center line of the lower shield tunnel directly face each other up and down and are arranged in a space parallel mode. Before shield tunneling construction, a part of an enclosure structure of a pipe-jacking working well is constructed, the part of the enclosure structure is divided into a shield influence area and a non-shield influence area according to a construction area, an enclosure structure influence area, namely the shield influence area, cut by a cutter head of a shield tunneling machine is made of a glass fiber reinforced concrete material, and the enclosure structure is designed in a targeted mode. The shield-first and pipe-jacking-second up-and-down parallel overlapping tunnel structure can well solve the common quality problems such as water leakage caused by differential settlement of pipe jacking joints, is suitable for subway construction with complex underground pipelines and limited available space in urban downtown areas, and has remarkable economic benefits.

Description

technical field [0001] The invention belongs to the field of underground tunnel construction, in particular to an upper and lower parallel overlapping tunnel structure and a construction method using different techniques of pipe jacking and shield tunneling. Background technique [0002] With the rapid development of the economy and the rapid development of the infrastructure industry, multiple planned subways in the same city are intertwined, the corresponding subway density is increasing, the construction environment is becoming more and more complex, and the accompanying construction difficulties and risks are increasing. In addition, there are inevitably more and more parallel overlaps between transfer passages and intervals in subway stations. [0003] The construction technology and construction sequence of the upper and lower parallel overlapping tunnels determine the quality of the construction, the control of the construction period and cost, and even affect the ope...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a tunnel structure and its construction method in which the upper and lower parallel overlapping tunnels are shielded first and then pipe jacked, so as to solve the problems of the existing upper and lower parallel overlapping tunnels. Improper selection of construction technology and construction sequence will affect the subsequent operation of the subway, and technical problems such as floating of the shield tunnel, uneven deformation of the pipe jacking channel, and water leakage will easily occur. It is also necessary to solve the existing construction methods that cannot be applied to the upper and lower Technical Problems in Simultaneous Construction of Parallel and Overlapping Tunnels

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