A primary support foot support device and method for a large-section tunnel with weak surrounding rock

A technology of weak surrounding rock and supporting devices, which is applied in the direction of tunnels, tunnel linings, shaft equipment, etc., to achieve the effects of reduced settlement, large pipe diameter, and coordinated settlement and deformation

Active Publication Date: 2021-07-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of subsidence of the primary support section steel foot of the existing weak surrounding rock large-section tunnel, the present invention provides a support device and method for the primary support foot of a large-section tunnel with weak surrounding rock, through which the support device can realize Reinforce the foot of the initial support section steel, reduce the deformation and settlement of the initial support section steel, and ensure the construction safety in the tunnel

Method used

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  • A primary support foot support device and method for a large-section tunnel with weak surrounding rock
  • A primary support foot support device and method for a large-section tunnel with weak surrounding rock
  • A primary support foot support device and method for a large-section tunnel with weak surrounding rock

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Embodiment 1

[0043] Please refer to Figure 1 to Figure 5, Embodiment 1 discloses a primary support foot support device for large-section tunnels with weak surrounding rocks, including connected connecting section steel 2, steel plate 4 and grouting pipe shed 3, wherein the grouting pipe shed 3 can be used to The grout is driven into the surrounding rock 6. In this embodiment, the diameter of the grouting pipe shed 3 is 90-110mm, the length of the injection is 4-5m, and the length of the part that is not driven outside the surrounding rock 6 is 20-30cm; The section steel 2 is connected to the grouting pipe shed, the steel plate 4 is used to connect the initial support section steel 1, and the connection section steel 2 includes multiple pieces, and the connection section steel 2 is connected between every two steel plates 4 to form a connection part, and the adjacent connection parts are used for common connection The same primary section steel 1; the grouting pipe shed 3 includes multiple...

Embodiment 2

[0054] Embodiment 2 discloses a primary support foot support method for a large-section tunnel with weak surrounding rock, using the primary support foot support device for a large-section tunnel with weak surrounding rock as described in Embodiment 1, including the following steps:

[0055] 1) Tunnel excavation, erecting the first primary support section steel 1;

[0056] 2) Drive the grouting pipe shed 3 into the side of the first primary support section steel 1, and perform grouting after the grouting pipe shed 3 is driven into the predetermined length;

[0057] 3) Connect the grouting pipe shed 3, the connecting section steel 2, the steel plate 4 and the first primary support section steel, and spray concrete;

[0058] 4) Excavate and erect the next primary support section steel 8 to ensure that the grouting pipe shed is located between the two primary support section steels;

[0059] 5) Repeat steps 2) to 4) to complete the preliminary work of the entire section;

[006...

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Abstract

The invention discloses a primary support foot support device and method for large-section tunnels with weak surrounding rocks, comprising connected connecting section steel, steel plates and grouting pipe sheds, wherein the grouting pipe sheds can be used to drive grout into the enclosure In Yanzhong; there are multiple connecting steel plates and steel plates, and the two ends of each connecting steel plate are respectively connected with steel plates to form a connecting part, and the adjacent connecting parts are used to jointly connect the same initial supporting steel; Each grouting pipe shed passes through and is connected to the corresponding connecting section steel; the grouting pipe shed is located in the middle of the adjacent primary section steel, and the adjacent grouting pipe sheds are symmetrical with respect to the initial support section steel. The invention can realize the reinforcement of the foot part of the initial support section steel through the reinforcement device, reduce the deformation and settlement of the connection section steel, and ensure the construction safety in the tunnel.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a primary support foot support device and method for large-section tunnels with weak surrounding rock. Background technique [0002] During the excavation and construction of large-section tunnels, sometimes the tunnel inevitably passes through weak surrounding rocks such as water-rich fault fracture zones and fully weathered soft rocks. After the construction of the initial support arch, the settlement and deformation of the initial support arch will easily occur under the pressure of the surrounding rock, which seriously threatens the safety of tunnel excavation. In order to prevent the initial steel arch from settling, it is usually reinforced at the foot of the initial steel arch during construction. The methods of reinforcement include grouting, locking foot anchors (pipes), and other methods. The grouting method is to strengthen the surrounding rock by injecting grout in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/30E21D11/18E21D11/10E21D11/22
CPCE21D11/10E21D11/18E21D11/22E21D11/30
Inventor 张连震韩子川翁贤杰李玉生樊文胜王洪超刘军楚云添张龙生王纪伟王建辉王润生
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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