A lining segment structure for overlapping shield tunnels in the upper and lower sections of urban subways

Abstract

The invention discloses a lining segment structure of city subway up-down section overlapping shield tunnels. The structure can satisfy construction loads such as the weight of a shield tunneling machine, the pressure supplied by the shield tunneling machine and stratum excavation stress relief under construction and structure safety and deformation under the effect of water and soil pressure and subway train loads during operation, satisfy construction performance of secondary slip casting on the back of a lining segment structure wall and synchronous and uniform slip casting of interlayers between the up-down overlapping tunnels, and at last satisfy the waterproofness and durability of tunnel use. The lining segment structure can be applied to V-level and VI-level strata in a city subway, the separation distance of the up-down overlapping section tunnels is 2 m-3 m, the shield excavation order of down first and then up is used for supplying technical assurance to the segment structure of the city subway up-down section overlapping shield tunnels under the conditions of up-down overlapping complex lines, and the section overlapping tunnels can better solve the problems of limit of surrounding environment, narrow boundary lines of roads and requirements for a net operation transfer function and is applied widely.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a lining segment structure for overlapping shield tunnels in the upper and lower sections of urban subways. Background technique [0002] Since the 21st century, my country has ushered in an unprecedented upsurge in the construction of subways. By the end of 2011, there were 14 cities in mainland China with a total length of 1688km. After more than 100 years of continuous improvement, the shield construction method has become the first choice in the construction of tunnels in subway intervals due to its advantages such as small impact on the environment, less construction area, less land acquisition and demolition, good economy, good construction safety, and good stratum adaptability. method of construction. [0003] In the early subway construction, the tunnels between the left and right lines were arranged separately, and the clear distance was greater than 1 times t...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of overlapping tunnels in the upper and lower sections of urban subway section tunnels in my country due to the constraints of the surrounding environment, narrow road red lines, and transfer function requirements for line network operations, the present invention provides a lining segment for overlapping shield tunnels in the upper and lower sections of urban subways. Structure, capable of meeting structural safety and deformation under various loads during construction and operation, as well as synchronous uniformity of grouting, waterproof performance and durability for tunnel use

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