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Supporting structure for tunnel without arch support passing through broken section of arch crown and construction method of supporting structure

A support structure and construction method technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of no better construction method and poor overall structural strength, achieve a safe and reliable construction environment, and improve the overall structural strength Effect

Pending Publication Date: 2021-10-19
ZHEJIANG COMM CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be supported in the early stage during the construction process. At the same time, the grout-stop wall and the surrounding wall are fixed by conduits, and the overall structural strength is not good.
Based on this, there is no better construction method for arch-supported tunnels passing through broken vaults.

Method used

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  • Supporting structure for tunnel without arch support passing through broken section of arch crown and construction method of supporting structure
  • Supporting structure for tunnel without arch support passing through broken section of arch crown and construction method of supporting structure

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0038] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention provides a supporting structure for a tunnel without arch support passing through a broken section of an arch crown and a construction method of the supporting structure. The method comprises the following steps that a danger elimination step is carried out, specifically, danger elimination is carried out by adopting a mode of combining machinery with manual work, and a first grout stopping layer is initially sprayed on bare surrounding rock; the construction step of temporary arch frame in the broken zone is carried out, specifically, a plurality of arch supports are arranged in the extending direction of the tunnel at intervals, reinforcing meshes are laid on the back faces of the arch supports, and second grout stopping layers are sprayed and hung on the arch supports and the reinforcing meshes; the reinforcement step is carried out, specifically, a plurality of hollow grouting anchor rods are arranged at intervals in the radial direction of the tunnel, and a plurality of advanced small guide pipes are arranged at intervals within the 120-degree range of the excavation contour line of the tunnel; grouting is carried out on the hollow grouting anchor rods and the advanced small guide pipes; a tunnel excavation step is carried out, specifically, after grouting is carried out for 8 hours, the grade of the surrounding rock is reduced, and tunneling construction is carried out; and a second lining construction step is carried out, specifically, when a second lining is constructed before the temporary arch frame, the arch supports are dismantled, and second lining construction of the broken zone is carried out. The method can be applied to the construction of the tunnel without the arch support penetrating through the broken section of the arch crown, and the safety coefficient of the construction process is high.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a support structure and a construction method for arch-free support tunnels passing through vault broken sections. Background technique [0002] At present, in the construction of highway tunnels with spray-bolt underground excavation method in grade III surrounding rock, most of the initial support adopts the support design without arch support, the support parameters are low, and the stability of the tunnel face depends entirely on the self-stabilization ability of the surrounding rock. In the process of tunnel construction, it is inevitable to encounter partially broken sections of surrounding rock, especially the section with broken vaults. It is difficult to detect by means of detection. After excavation, the vaults are prone to fall and even collapse. Based on this, after the excavation of the tunnel, when the surrounding rock of the tunnel face vault is found to be relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D11/18E21D20/02
CPCE21D11/003E21D11/10E21D11/107E21D11/18E21D20/02
Inventor 杨康袁登陈李张兆龙陈宇黄晶李枝文汪梦祥张子铖李柳
Owner ZHEJIANG COMM CONSTR GRP CO LTD
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