Steel backrests used in subway tunnel construction

Abstract

The invention relates to a steel back support in subway tunnel construction. The steel back support is arranged between a second lining of a mined tunnel and a shield tunnel and serves as a shield starting counterforce substrate; the whole steel back support is a ring, and consists of six external circle arc plates and internal circle arc plates altogether; each arc plate is 90mm in length and 1,075mm in width, the outer diameter of each arc plate is slightly smaller than the outer diameter of the mined tunnel and is 7,500mm, and the inner diameter of each arc plate is consistent with the inner diameter of a duct piece of the shield tunnel and is 5,500mm. The steel back support solves the problem of connecting two types of tunnels and meets the requirement on a counterforce support for shield starting construction; the steel back support is preprocessed, is transported to a site before installation and then is installed, and the restrict influence of a construction period is greatly reduced.

Description

technical field [0001] The invention relates to a steel backrest used in the construction of subway tunnels, especially one installed between the second lining of the mining method tunnel and the shield tunnel. The design of the backrest of the steel structure is used to connect two different types of tunnels. The steel backrest is used as the starting reaction base of the shield and the purpose of saving the construction period is achieved. Background technique [0002] It has been 30 years since the construction of rail transit in China. From the initial construction of rail transit to now, usually in the construction of shield tunneling, temporary steel is placed in the station end well and then leaned against it as the reaction force support of the shield starting section. However, this kind of steel backrest is only limited to temporary use in the end shaft, and cannot be used as a permanent component connecting two tunnels of different sizes and types, or as a backrest...

AI Technical Summary

Problems solved by technology

[0002] It has been 30 years since the construction of rail transit in China. From the initial construction of rail transit to now, usually in the construction of shield tunneling, temporary steel is placed in the station end shaft and then leaned against it as the counter force support for the starting section of the shield tunneling. However, this kind of steel backrest is only limited to temporary use in the end shaft, and cannot be used as a permanent component connecting two tunnels of different sizes and types or as a backrest support for shield tunneling.

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