Tunnel inverted arch and inverted arch filling layer replacing steel-concrete composite structure and construction technology

Abstract

The invention discloses a tunnel inverted arch and inverted arch filling layer replacing steel-concrete composite structure and a construction technology. The tunnel inverted arch and inverted arch filling layer replacing steel-concrete composite structure is composed of a prefabricated inverted arch and a steel truss structure laid on the prefabricated inverted arch; the prefabricated inverted arch is formed by assembling a plurality of fabricated inverted arches from back to front, and the steel truss structure includes a plurality of vertical steel trusses and steel-concrete composite plates; and one vertical steel truss is arranged above the middle part of each fabricated inverted arch, and each steel-concrete composite plate includes horizontal steel plates and a cast-in-place concrete layer. The construction technology includes steps of first prefabricated inverted arch assembly construction and second steel truss structure construction. According to the tunnel inverted arch andinverted arch filling layer replacing steel-concrete composite structure and the construction technology, the structure design is reasonable, the construction technology is simple and convenient, andthe use effect is good; and a cast-in-place tunnel bottom lining is replaced by a fabricated inverted arch formed by connecting three inverted prefabricated parts, and the concrete-filled inverted arch filling layer is replaced by the steel truss structure, alignment and splicing are carried out on site, the tunnel inverted arch and tunnel filling construction process can be greatly simplified, the construction efficiency can be improved, and the construction quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel inverted arch and an inverted arch filling layer instead of a steel-concrete composite structure and a construction process. 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 systems, ...

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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