Tunnel construction method adopting prefabricated inverted arch module

Abstract

The invention relates to the technical field of tunnel construction, and discloses a tunnel construction method adopting a prefabricated inverted arch module. According to the tunnel construction method, a connecting steel frame is supported between a preliminary brace and the prefabricated inverted arch module more firmly, finally, a fastening bolt between the connecting steel frame and an embedding sleeve is fastened again, the connecting steel frame and the embedding sleeve are welded, a fastening bolt between a connecting steel plate and a supporting steel plate is fastened again, the connecting steel plate and the supporting steel plate are welded, accordingly, it is ensured that the prefabricated inverted arch module and the preliminary brace are stably connected, the phenomenon thatdue to the fact that the connecting steel frame is not tightly mounted, and the preliminary brace deforms towards the inner side due to the surrounding rock pressure is avoided; and inverted arch filling in traditional tunnel construction is replaced with the prefabricated inverted arch module, accordingly, it is ensured that a support around the tunnel can rapidly form a closed loop, deformationsettlement of an excavated segment of the tunnel can be avoided, and the stability and the construction proceed of the tunnel structure can be improved.

Description

Technical field [0001] The present disclosure relates to the technical field of tunnel construction, and in particular to a tunnel construction method using a prefabricated invert module. Background technique [0002] With the rapid development of my country's railway construction, railway construction has involved all regions of the country. When railway construction is subject to terrain restrictions, tunnels need to be excavated when encountering mountainous areas. Tunnel construction has become an indispensable part of the railway construction process. In actual construction, the tunnel structure usually consists of upper steps, lower steps and inverted arches. At present, the initial support, second lining and backfilling of the inverted arch of the tunnel are all done by tying the steel bars on site and then using cast-in-place concrete. This method has many construction procedures, low mechanization, and difficult to control quality, which is more important. It is a cast...

AI Technical Summary

Problems solved by technology

At present, the initial support, secondary lining, and backfilling of the inverted arch of the tunnel are all done by tying steel bars on site, and then cast-in-place concrete. This method has many construction procedures, a low degree of mechanization, and difficult quality control. The cast-in-place inverted arch is lagging behind in its formation and stress, which is inconsistent with the design and construction principle of "early closure" of the tunnel. It cannot effectively control the deformation and settlement of the excavated section, and it is easy to cause cracking, deformation, collapse, subsidence, and flooding of the initial support. mud accident

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