Temporary steel support demolition construction method for large-section multi-pilot-tunnel tunnel

Abstract

The invention discloses a temporary steel support demolition construction method for a large-section multi-pilot-tunnel tunnel. The method is divided into the demolition of a part above a middle plateand the demolition of a part under the middle part and concretely comprises the demolition of a first layer pilot tunnel, the demolition of a first transverse support, the demolition of a second vertical support and a second transverse support, the demolition of two sides of a third transverse support and a fourth transverse support and a fifth vertical support, the demolition of the third vertical support, the demolition of meshes and a section steel support in a third layer pilot tunnel, the demolition of the middle parts of the third transverse support and the fourth transverse support andthe demolition of remaining vertical and transverse supports. According to the method, the overlapping length and welding quality of a waterproof board at the connection position between a tunnel inverting arch and a side wall structure are ensured, the operation is easy, the waterproof quality of the tunnel is satisfied, staggered and independent operations in upper and lower parts are performed, the operation space is optimized, the interference of the cross working is reduced, the work efficiency is improved, the vault settlement and lining peripheral convergence of the steel support demolition are precisely controlled, and the construction risk of tunnel structure is reduced.

Description

technical field [0001] The invention relates to the technical field of removal construction of temporary steel supports of tunnels, in particular to a construction method for removal of temporary steel supports of large-section multi-pilot tunnel tunnels. Background technique [0002] The Gongbei Tunnel of the Zhuhai Link of the Hong Kong-Zhuhai-Macao Bridge is a control project of the Zhuhai Link. The underground excavation section is 255m long and passes through the restricted area of ​​the Gongbei Port. The geological conditions are complex, and it passes through the Gongbei Customs, which has extremely high requirements for environmental protection and is extremely sensitive to political factors. The underground excavation section is located in a saturated soft soil environment near the sea, with complex strata, weak geology, shallow buried water table (about 1m below the ground), and abundant water. The buried depth of the vault is 4-5m, the excavation width is 18.8m, t...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for removing the temporary steel support of a tunnel with large cross-section and multiple pilot tunnels, so as to solve the problems of surface settlement and deformation of the tunnel structure in the prior art when the steel support is removed

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