Construction method for weak surrounding rock section of short-step super-large-section tunnel

A technology with super-large cross-section and weak surrounding rock, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of increased difficulty in tunnel construction and construction difficulties, and achieve the reduction of vault sinking, the convenience of mechanized construction, and the construction space Increased effect

Pending Publication Date: 2022-04-12
THE FIRST ENG OF CCCC FOURTH HARBOR ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the tunnel section continues to increase, the difficulty of tunnel construction also increases. In addition, most tunnels have characteristics such as weak surrounding rock, complex geology, shallow burial, and rich water, making construction more difficult.

Method used

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  • Construction method for weak surrounding rock section of short-step super-large-section tunnel
  • Construction method for weak surrounding rock section of short-step super-large-section tunnel
  • Construction method for weak surrounding rock section of short-step super-large-section tunnel

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but the described embodiments are only part of the embodiments of the present invention, not all embodiments, and the scope of protection of the present invention is not limited to this.

[0026] This embodiment is V-level surrounding rock, and the initial support adopts I22 steel frame with a spacing of 0.5m; φ50 grouting lock-foot anchor pipes, 12 in each ring; φ50 advanced anchor pipes, with a circumferential spacing of 40cm.

[0027] The present invention provides a construction method for the weak surrounding rock section of a super-large cross-section tunnel with short steps. The excavation method is as follows, and the construction sequence of each working face is detailed in figure 1 ;

[0028] S1: Excavate the arc-shaped pilot pit at the top 1: The arc-shaped pilot pit 1 at the top is excavated mechan...

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Abstract

The invention discloses a construction method for a weak surrounding rock section of a short-step super-large-section tunnel, and belongs to the technical field of tunnel construction. The construction method comprises the following steps that S1, a top arc-shaped pilot tunnel is excavated; s2, middle steps on the two sides are excavated left and right; s3, excavating lower steps on the left side and the right side; s4, core soil is excavated; and S5, tunnel bottom excavation and inverted arch supporting are carried out. The construction method is high in safety, fast in construction progress, short in construction period, stable in supporting structure, short in forming time of each whole ring, large in construction space, convenient for mechanical deslagging, fast in construction effect and capable of effectively shortening the closed ring forming time.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and mainly relates to a construction method for the weak surrounding rock section of a tunnel with a short step and a super large section. Background technique [0002] Tunnel construction with super large section has always been a difficult point in tunnel construction. With the rapid development of highway construction in our country, there are more and more large section tunnels with three or four lanes in highway tunnels. As the tunnel section continues to increase, the difficulty of tunnel construction also increases. In addition, most tunnels have characteristics such as weak surrounding rock, complex geology, shallow burial, and rich water, making construction more difficult. In the prior art, excavation methods commonly used in tunnel construction include full-section method, step method, circular pilot pit (reserved core soil) method, middle partition method (CD method), cros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10E21D11/15E21D11/18E21D20/02
CPCE21D11/15E21D9/00E21D11/18E21D20/02E21D11/10
Inventor 单良杨征黄国忠陈日胜陈中略刘永峰杨炼刘斌于路王惠鸿曹玉红
Owner THE FIRST ENG OF CCCC FOURTH HARBOR ENG
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