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Advanced pre-supporting construction method for tunnel

A construction method and pre-support technology, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve the problems of face collapse and low stability of the face, and achieve the effect of improving stability and reducing the risk of collapse.

Pending Publication Date: 2021-06-15
CHINA FIRST HIGHWAY ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the soil around the tunnel is weak surrounding rocks such as water-bearing sand layers, the stability of the tunnel face is low. Even if the existing advanced pre-support method is used to strengthen the soil, the tunnel face still has the risk of collapse

Method used

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  • Advanced pre-supporting construction method for tunnel
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  • Advanced pre-supporting construction method for tunnel

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Embodiment

[0059] Such as image 3 As shown, the tunnel advance pre-support construction method provided in this embodiment includes the steps of excavating the soil mass, reinforcing the tunnel face and reinforcing the soil mass. The step of excavating the soil mass is denoted as S1 and the step of reinforcing the tunnel face is denoted as S2, record the soil reinforcement step as S3.

[0060] Step S1: Excavating the soil body section by section along the extension direction of the tunnel 1 according to the first preset interval;

[0061] Step S2: After the first preset distance of each excavation footage, a set of reinforcement conduits are drilled towards the soil in front of the tunnel face on the digging face formed after excavation;

[0062] Step S3: Along the extension direction of the tunnel 1, a group of advanced conduits 2 are drilled into the soil above the vault of the tunnel 1 at every second preset distance.

[0063] Wherein, there is no distinction between step S2 and st...

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Abstract

The invention provides an advanced pre-supporting construction method for a tunnel, and relates to the technical field of tunnel construction. The advanced pre-supporting construction method for the tunnel comprises the steps that in the extending direction of the tunnel, a soil body is excavated section by section according to a first preset interval; after each excavation footage reaches the first preset interval, a set of reinforcing guide pipes are arranged on the position, facing the soil body in front of the tunnel face, of the tunnel face formed after excavation; and in the extending direction of the tunnel, a set of advanced guide pipes are arranged in the soil body above a vault of the tunnel at intervals of a second preset interval. According to the advanced pre-supporting construction method for the tunnel, the advanced guide pipes are arranged in the soil body above the vault of the tunnel to reinforce the soil body in front of the tunnel face, the reinforcing guide pipes are arranged on the tunnel face formed after excavation to reinforce the tunnel face and the soil body in front of the tunnel face, even if the soil body around the tunnel is weak surrounding rock such as a water-containing sand layer, the stability of the tunnel face can be greatly improved, and therefore the collapse risk of the tunnel face can be reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunnel advance pre-support construction method. Background technique [0002] During the construction of the tunnel, the soil needs to be excavated to form the channel. In the process of tunnel excavation, the working face that is constantly advancing is the tunnel face. Since there is a risk of collapse of the tunnel face when excavating the tunnel, the existing tunnel construction usually adopts the advanced pre-supporting method to protect the tunnel ahead The soil mass of the face is reinforced to prevent the face from collapsing. [0003] Such as figure 1 and figure 2 As shown, the existing advanced pre-supporting method is along the excavation direction, and after a certain distance between each excavation footage, a row of inclined upward advanced conduits 2 is drilled at the vault of the tunnel 1, and the advanced conduits 2 can be used to reinforce the ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10
CPCE21D9/00E21D11/10Y02E10/20
Inventor 刘生徐厚庆贾要清周维毅姚晨
Owner CHINA FIRST HIGHWAY ENG
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