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Primary support method for over-excavated tunnels with ⅳ~ⅵ grade surrounding rock

A technology for primary support and tunneling, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of voiding and shelling, prevent slurry running, solve the problem of over-excavation voiding, and reduce the amount of springback Effect

Active Publication Date: 2020-06-02
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides an initial support method for over-excavated tunnels with surrounding rocks of grades IV to VI, which solves the problem that the existing over-excavated tunnel initial support methods have the phenomenon of voiding and shelling, resulting in potential safety hazards

Method used

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  • Primary support method for over-excavated tunnels with ⅳ~ⅵ grade surrounding rock
  • Primary support method for over-excavated tunnels with ⅳ~ⅵ grade surrounding rock
  • Primary support method for over-excavated tunnels with ⅳ~ⅵ grade surrounding rock

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing.

[0034] refer to figure 1 , the present invention includes a primary support method for over-excavated tunnels with IV-VI surrounding rocks, comprising the following steps:

[0035] S1. Shotcrete support for the tunnel excavation face with over-excavation. Shotcrete support is used to initially seal the excavation face, for example, spray 4cm thick C20 concrete along the tunnel excavation face.

[0036] S2. Install the arch frame 1 in the tunnel, and fix the arch frame 1 in the rock and soil body outside the tunnel excavation contour line 2; the arch frames 1 are connected by longitudinal connecting steel bars 3, and the reinforcement mesh is installed inside the arch frame 1 4.

[0037] The installation of the arch 1 should be carried out according to the design support parameters. The arch 1 is installed at the design position. The arch 1 is a grid arch 1 and / or a steel...

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Abstract

The invention discloses an initial support method for an over-excavation excavation tunnel of surrounding rocks of IV-VI stages, and relates to the field of civil engineering. The problem that an existing initial support method of the over-excavation tunnel has the phenomena of voiding and shelling and has the problem of safety hazard is solved. According to the technical scheme, the initial support method for the over-excavation tunnel of the surrounding rock of the IV-VI stages includes the steps that S1, shotcrete support is performed on a tunnel excavation surface with over-excavation; S2,an arch frame is installed in and fixed into a tunnel, and a steel mesh is installed on the inner side of the arch frame; S3, steel floral tubes are separately and radially arranged at the system anchor rod position of the tunnel; S4, exhaust pipes are fixedly connected to the outer sides of the steel floral tubes; S5, a steel plate or a steel strip is installed; S6, a pneumatically placed shotcrete filling area is filled with concrete and compacted; S7, concrete is sprayed to a direct shotcrete support area, and the concrete is sprayed with the steel plate / strip as an outer formwork; S8, grouting and / or backfilling concrete is performed on a void area behind the arch frame; and S9, a system anchor rod is constructed.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to an initial support method suitable for tunnels in IV-VI broken surrounding rocks or loose gravel soil where a large number of over-excavations occur after tunnel excavation. Background technique [0002] When building new railways, highway tunnels and underground caverns, tunnels and caverns are excavated in IV~VI broken surrounding rocks or loose gravel soil. Due to the deterioration of surrounding rock engineering properties, improper excavation methods, or excessive If the maintenance is not timely, etc., it is easy to cause a large number of overexcavation situations. Over-excavation means that the actual excavation contour line exceeds the design excavation contour line, that is, the actual excavation volume is greater than the design excavation volume. Moreover, over-excavation of tunnel arches in grade IV-VI surrounding rock sections is a common phenomenon. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/18E21D20/00
CPCE21D11/10E21D11/18E21D20/00
Inventor 吴学智曾建军聂大丰刘智勇李国庆
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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