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Underground tunnel digging method

An underground passage and underground excavation technology, applied in underground chambers, tunnels, earthwork drilling and mining, etc., can solve problems such as overexcavation, leakage, landslides, etc., and achieve the effects of reducing disturbance, ensuring safety, and simple construction methods

Active Publication Date: 2022-06-28
CHINA CONSTR EIGHT ENG DIV CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in the actual construction process, under the influence of factors such as the main structure of the underground passage, geological structure, and construction steps, if a safe and reliable construction method is not used, it may not only lead to quality accidents such as over-excavation and leakage during the construction process, Even lead to safety hazards such as landslides

Method used

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Examples

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Embodiment 1

[0058] A subway tunnel in a certain city is set up with an undercut channel near the entrance and exit. The total length of the channel is about 10m, and the interrupted surface is a regular rectangle. Generally, the construction is carried out by the step method, and the length of the step is 3-5m. In general, a closed structure, that is, the underground passage, is divided into left and right parts (ie, the first pilot hole 1 and the second pilot hole 2) for construction, and a total of four steps are carried out in the same closed space for step excavation.

[0059]First, the advance support structure 6 of the underground passage is formed by deep hole grouting and reinforcement. The first pilot hole 1 is excavated by the step method and constructed as the first initial support structure 11 and the first secondary lining structure 12. The temporary support 4 is erected on the I-beam, and the spacing between the temporary supports 4 is 1m, and then the step method earthwork e...

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Abstract

The invention discloses a method for underground tunnel excavation, which comprises steps: 1. The underground tunnel is divided into a first pilot tunnel (1) and a second pilot tunnel (2); 2. Deep hole grouting reinforces the soil to form advanced support 3. Construction of the first pilot tunnel and its first primary support structure (11) and first secondary lining structure (12); 4. Erection at the junction of the first pilot tunnel and the second pilot tunnel Temporary support (4), pouring partition wall (5); 5. Implement the second pilot tunnel and its second primary support structure (21) and second secondary lining structure (22); 6. Remove temporary support, Partition wall and part of the first primary support structure. On the premise of ensuring construction safety and quality, the invention can effectively reduce the construction cost of the underground passage, speed up the construction progress, and reduce the disturbance to the surrounding area.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to an underground tunnel excavation method. Background technique [0002] During the construction of underground passages such as subways, highways, railways, pipe corridors, and tunnels, the cross-sectional forms are complex and changeable, such as symmetrical double-arch tunnels, asymmetrical double-arch tunnels, symmetrical triple-arch tunnels, and asymmetric triple-arch tunnels. The new Austrian method is often used in the tunnel construction of the prior art. The new Austrian method refers to a construction method that combines bolts and shotcrete as the main support means. The construction sequence is: excavation → one-time support Protection → secondary support. However, in the actual construction process, under the influence of the main structure, geological structure, construction sequence and other factors of the underground passage, if a safe and reliable construction meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/15E21D11/38E21D20/02
CPCE21D11/10E21D11/38E21D11/152E21D20/02
Inventor 高宇峰李洪杰孙红岩刘洪键张国贤闫江安景欣李广鑫
Owner CHINA CONSTR EIGHT ENG DIV CORP LTD
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