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Weak surrounding rock large section tunnel double-side-wall pilot tunnel support structure excavated through three-step method and construction method

A technology of double-sided guide pit and weak surrounding rock, applied in tunnels, tunnel linings, earth-moving drilling and mining, etc., can solve the problems of high construction risk and difficult to guarantee the quality of lining in the later stage, saving engineering materials, reducing the number of demolition, simple structure

Active Publication Date: 2017-10-24
NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide an extrusion-type weak surrounding rock ultra-large cross-section short tunnel in order to solve the problems of relatively large construction risks in the initial support structure of the existing weak surrounding rock tunnel under the action of high ground stress, and difficulty in guaranteeing the quality of the later lining. Excavation support structure and construction method

Method used

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  • Weak surrounding rock large section tunnel double-side-wall pilot tunnel support structure excavated through three-step method and construction method

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] see figure 1 , a three-step excavation and support structure for double-side pilot pits and large-section tunnels with soft surrounding rocks, which is suitable for rapid construction of large sections with weak surrounding rocks, including upper support, middle support and lower support from top to bottom .

[0016] see figure 1 , the upper support includes the left side wall pilot pit support 1, the middle partition wall support 3 and the right side wall pilot pit support 2, and the middle support includes the left middle step support 4 and the right middle step Support 5, the lower support includes left lower step support 6 and right lower step support 7. The guide pit support 1 on the left side wall and the pilot pit support 2 on the right side wall respectively include a steel arch I and a temporary support, and the ste...

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Abstract

Disclosed are a support structure excavated in a squeezing type weak surrounding rock extra-large section short tunnel and a construction method. The support structure comprises upper supports, middle supports and lower supports from top to bottom; the upper supports comprise the left side wall pilot tunnel support (1), the mid-partition support (3) and the right side wall pilot tunnel support (2); the middle supports comprise the left middle step support (4) and the right middle step support (5); and the lower supports comprise the lower left step support (6) and the lower right step support (7). The construction method comprises the following steps of excavation construction of the left side wall pilot tunnel support (1), excavation construction of the right side wall pilot tunnel support (2), excavation construction of the mid-partition support (3), excavation construction of the middle supports, and excavation construction of the lower supports. Sinking of arch surrounding rock is forcefully resisted, construction safety is guaranteed, meanwhile the construction time of an anchor cable is shortened, and engineering materials are saved.

Description

technical field [0001] The invention relates to a tunnel support structure and a construction method, more specifically to a tunnel support structure and a construction method for a large-section tunnel with weak surrounding rocks and a double-side-wall pilot pit with three-step method excavation and support, and belongs to the technical field of tunnel construction. Background technique [0002] In the construction process of large-section tunnels with weak surrounding rocks, the traditional excavation methods are CRD method, double-side-wall pilot-pit method, etc. These traditional excavation methods can often achieve good results in ensuring excavation safety and controlling deformation; however, there are many temporary supports, and it is difficult to disassemble them, resulting in high construction risks, narrow working space, slow construction progress, and high construction costs. Contents of the invention [0003] The purpose of the present invention is to provide...

Claims

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Application Information

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IPC IPC(8): E21D9/14E21D11/18E21D20/00E21D11/10
CPCE21D9/14E21D11/10E21D11/18E21D20/00Y02E10/20
Inventor 黄新宇何磊汪伟李行利王宁
Owner NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP
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