Tunnel arch exchanging construction method and construction structure in tunnel arch exchanging construction

Abstract

The invention discloses a tunnel arch exchanging construction method. The tunnel arch exchanging construction method comprises the following steps of: constructing a temporary support under a tunnel transgression limit section, drilling grouting holes on arch part surfaces of tunnel primary supports, stretching steel floral tubes into the grouting holes, and grouting cement grout so as to reinforce a surrounding edge outside a tunnel excavating contour line; and setting lead tube sheds on the tunnel arch part along a circumferential direction, disassembling the primary supports finally and sequentially according to the distance of primary support steel arch frames, remaking one primary support after one primary support is disassembled, and alternately carrying out the operation of disassembling and remaking until all the arch exchanging constructions in the tunnel transgression limit section are finished. A construction structure disclosed by the invention comprises foundation beams, the temporary support and the steel arch frames, wherein foundation frames of the temporary support are arranged on the foundation beams, the top part of the temporary support is used for supporting the steel arch frames, the grouting holes and the lead tube sheds are uniformly distributed above the steel arch frames, the grouting holes are provided with the steel floral tubes, and the lead tube sheds are mainly formed by the steel floral tubes. The tunnel arch exchanging construction method and the construction structure, which are disclosed by the invention, have the advantages that the working procedure is simple and clear, the safety coefficient is high, the recovery degree of the bearing ability is quick, and the like.

Description

Technical field [0001] The present invention involves a construction method and construction structure in the construction process of a tunnel, and especially involves a construction method of a tunnel replacement and arching of tunnels. Background technique [0002] At present, the construction of highway tunnels generally adopts drilling method. The design is generally adopted by the new Olympic method, that is, make full use of the bearing capacity of the surrounding rock itself during the excavation process.The rocks were stressed together, and they deformation together. After the transformation of the surrounding rock basically converged, the secondary lining coordinated the initial support.During the initial support of the tunnel, due to poor geological conditions, when shallow, partial pressure, groundwater are developing, the construction organization is inadequate or the construction process is unreasonable, it is easy to be prone to or initial support during the tunnel ...

AI Technical Summary

Problems solved by technology

In fact, the deformed surrounding rock may not be loose, and many projects have the problems of common static pressure grouting penetration and ineffective consolidation; in addition, the injected consolidation grout is not so much "cement slurry" as "mud-water slurry" , cement slurry injected into the surrounding rock, the first role is not to "glue" the loose surrounding rock together like "glue sticky paper", but to soften the surrounding rock first with water, which is very dangerous in tunnel construction, and many tunnels are collapsed during grouting

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