Pre-reinforcement method and pre-reinforcement structure for full section of tunnel

A full-section, pre-reinforcement technology, used in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of the working face affecting the stability of the support, and achieve the effect of excellent reinforcement effect, high safety, and maintenance of construction costs.

Inactive Publication Date: 2015-01-28
CHINA SHENHUA ENERGY CO LTD +1
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a tunnel full-section pre-reinforcement method, which can solve the problem that the working face collapses and affects the stability of the initial support during the excavation and support process of a loess tunnel excavated with a full section

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  • Pre-reinforcement method and pre-reinforcement structure for full section of tunnel
  • Pre-reinforcement method and pre-reinforcement structure for full section of tunnel

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Embodiment Construction

[0036] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] First of all, this embodiment provides a method for pre-reinforcement of a full section of a tunnel, which includes the following steps:

[0038] S1. Arrange the conduit 1 in the surrounding rock of the tunnel to be dug along the contour line of the face 4, and grout the surrounding rock of the tunnel to be dug through the conduit 1 (such as figure 1 and figure 2 shown);

[0039] S2. Arrange a plurality of easy-cutting anchor rods 2 from the tunnel face 4 to the tunnel to be excavated (such as figure 1 and figure 2 shown);

[0040] S3. Excavating the face 4.

[0041] Wherein, the surrounding rock refers to the rock or soil surrounding the cavern, ...

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Abstract

The invention discloses a pre-reinforcement method and a pre-reinforcement structure for a full section of a tunnel. The method comprises the following steps: S1, arranging a plurality of conduits (1) in the surrounding rock of a to-be-excavated tunnel and along the contour line of a tunnel face (4), and grouting to the surrounding rock of the to-be-excavated tunnel through the conduits (1); S2, arranging a plurality of free-cutting anchor rods (2) in the to-be-excavated tunnel from the tunnel face (4); S3, excavating the tunnel face (4). The pre-reinforcement method and the pre-reinforcement structure disclosed by the invention are easy in field operation, reasonable in reinforcement cost, high in safety and good in reinforcement effect, and the problem that the working face of the tunnel collapses due to excessive extrusion deformation during a loess tunnel excavation and support process of full section excavation to influence the primary support stability is solved very well; as mechanized construction is not influenced by the free-cutting anchor rods during the construction process, so that the construction speed is quickened very well, the reasonable construction cost is kept, the construction safety, the construction quality, the construction period and the like are ensured, and the tunnel construction level is improved; the pre-reinforcement method and the pre-reinforcement structure have very good site construction value.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a tunnel full-section pre-reinforcement method and structure. Background technique [0002] With the development of railways and highways, it is necessary to dig tunnels through the loess strata in many places. For sandy loess strata with extremely poor crossing stability, especially newly accumulated loess, the dry density of the soil is small, the porosity is relatively large, the compression deformation is large, and the permeability is strong. After being saturated with water, the soil structure is easily destroyed, the cohesion decreases rapidly, and it presents strong collapsibility. Under the action of water, there will be collapsible joints on the ground, and sometimes funnels and pits will be formed. However, the joint surface is parallel to the steep slope of the ground, and the stress is released after the excavation of the tunnel, which is easy to produce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D20/00
CPCE21D11/00E21D11/10E21D20/00
Inventor 何知思
Owner CHINA SHENHUA ENERGY CO LTD
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