Tunnel construction method based on inverted arch and inverted arch filling layer instead of steel-concrete composite structure

Abstract

The invention discloses a tunnel construction method based on an inverted arch and inverted arch filling layer replaced steel and concrete combined structure. A tunnel secondary lining of a construction tunnel is formed by splicing an arch wall lining and a tunnel bottom lining, the tunnel bottom lining is a prefabricated inverted arch, and the inverted arch and inverted arch filling layer replaced steel and concrete combined structure is formed by the prefabricated inverted arch and a steel truss structure arranged on the prefabricated inverted arch. During construction tunnel construction, the steps including the first step of tunnel excavation, the second step of preliminary bracing, the third step of prefabricated inverted arch splicing construction, the fourth step of steel truss structure construction and the fifth step of arch wall lining construction are included. According to the method, step design is reasonable, construction is simple and convenient, the usage effect is good, a cast-in-place tunnel bottom lining is replaced with the assembled inverted arch formed through connection of three inverted arch prefabricated pieces, a concrete filling inverted arch filling layer is replaced with the steel truss structure, only alignment splicing is needed on the site, the tunnel inverted arch and tunnel filling construction process can be greatly simplified, the arch wall lining construction quality can be ensured, and the construction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel construction method based on an inverted arch and an inverted arch filling layer instead of a steel-concrete composite structure. Background technique [0002] At present, our country is a developing country, and transportation is the lifeblood of the national economy. At the same time, our country is also a mountainous country. Therefore, many railways and highways have to pass through tunnels to overcome terrain and elevation obstacles, thereby improving the technical indicators of the route and shortening the mileage of the route. Speed ​​up inter-regional linkages. The safety of the tunnel structure has become a bottleneck fortress in the development of the transportation industry. [0003] During actual construction, the tunnel structure usually consists of arch rings, side walls, inverted arches, inverted arch filling, advanced support syst...

AI Technical Summary

Problems solved by technology

At present, the initial support, secondary lining, and backfilling of the inverted arch (also known as the inverted arch filling or the inverted arch filling layer) are all done by binding steel bars on site and then pouring concrete in place. The construction process of this method Many, the degree of mechanization is low, the quality is difficult to control, and more importantly, the formation and stress of the cast-in-place inverted arch are lagging behind. Accidents such as initial branch cracking, deformation, collapse, subsidence, mud turning, etc.

In addition, due to the influence of concrete mixing, molding, tamping, curing and form removal, etc., the cast-in-place concrete is prone to phenomena such as lining honeycomb, pitted surface, and vault concrete pouring is not dense, and the construction quality cannot be effectively guaranteed

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