Method for enhancing supporting by grid arch rack during large-section tunnel excavation construction

A tunnel excavation and large-section technology, which is applied in the direction of tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems that the anchor net shotcrete support technology cannot meet the safety technical requirements, and achieve advanced and reasonable construction methods, ensure safety, and prevent softening effect

Inactive Publication Date: 2017-09-05
GUIZHOU KAILIN CONSTR GRP CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a large-section tunnel excavation construction grid arch reinforcement support method to solve the technical problems existing in the bolt-mesh shotcrete support technology that cannot meet the safety technical requirements

Method used

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  • Method for enhancing supporting by grid arch rack during large-section tunnel excavation construction
  • Method for enhancing supporting by grid arch rack during large-section tunnel excavation construction
  • Method for enhancing supporting by grid arch rack during large-section tunnel excavation construction

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Embodiment 1

[0037] Such as figure 1 As shown, a large-section tunnel excavation construction grid arch reinforcement method includes the following steps:

[0038] 1. Initial support of anchor mesh concrete

[0039] In order to ensure the safety of construction workers and tunnel structures, temporary support must be strengthened, and concrete should be sprayed in time to seal the excavation surface, especially where there is a lot of water in bedrock fissures. The softening effect of the surrounding rock can give full play to the self-supporting capacity of the surrounding rock. When spraying concrete, make the surface of the spray layer smooth and smooth, the nozzle is basically perpendicular to the surface to be sprayed, the distance is kept about 0.6-0.8m, and the spray is sprayed from bottom to top in a spiral shape. Use C20 sprayed concrete, ￠20 reinforced resin anchor rod, anchor rod length L=2500mm, ￠6.5 steel mesh, mesh size 150mm×150mm.

[0040] 2. The grid steel arch frame st...

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Abstract

The invention belongs to the technical field of large-section tunnel construction. In the actual engineering construction, for the unstable rock stratum which is soft in soil texture and thicker in accumulative formation, the existing supporting method is difficult to meet the safety and technical quality requirements of tunnel engineering construction, so that the invention discloses a method for enhancing supporting by a grid arch rack during large-section tunnel excavation construction. The method adopts a combined supporting way of initial support of anchor rod reinforcing mesh concrete and reinforced support of the steel grid arch rack, thus effectively guaranteeing the safety of constructors and tunnel structures, preventing the softening action of water on surrounding rock, fully exerting the self-bearing ability of the surrounding rock, and effectively solving the problem that the existing supporting method is difficult to meet the safety and technical quality requirements of the tunnel engineering construction for the unstable rock stratum which is soft in soil texture and thicker in accumulative formation.

Description

technical field [0001] The invention relates to the technical field of large-section tunnel construction, in particular to a method for strengthening and supporting a large-section tunnel excavation construction grid arch frame. Background technique [0002] In recent years, with the rapid development of the scale and speed of tunnel construction, the requirements for the construction cycle have become increasingly stringent. In the traditional excavation and support process of underground engineering, the initial support and installation of the arch frame is carried out manually, that is, with the help of the operating platform, the arch frame is manually placed at the designated position, and then the arch frame is manually assembled with bolts. The weight of the arch frame is large. Generally, there are 10 or more people in each labor team, which has high labor intensity, low operation efficiency and poor safety. At the same time, the tunnel planned during the constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21D11/10E21D20/00
CPCE21D11/10E21D11/18E21D20/00
Inventor 苟光强张洪马兴国
Owner GUIZHOU KAILIN CONSTR GRP CO LTD
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