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Side-top arch collapse cavity supporting system and method for super-large-section tunnel in plateau region

A technology with extra-large section and large section, which is applied in the field of tunnel support system, can solve the problems of unstable support, long construction period, and high construction pressure, and achieve the effect of simple on-site construction, saving construction period, and stable support period

Inactive Publication Date: 2017-05-10
中铁二十一局集团第六工程有限公司
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Problems solved by technology

In the initial support of the cave, if the traditional anchor rod, steel mesh and shotcrete initial support are used for the large-area collapse cavity, the support will be unstable, which will easily cause the entire sprayed concrete to collapse
In addition, due to the high cold and lack of oxygen in the plateau area, the remedial treatment of the collapsed cavity on the top of the large-section cave has the problems of high construction pressure and long construction period

Method used

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  • Side-top arch collapse cavity supporting system and method for super-large-section tunnel in plateau region

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Embodiment Construction

[0015] The present invention is described in detail below in conjunction with accompanying drawing:

[0016] A side arch collapse cavity support system for extra-large-section tunnels in the plateau area. Excavating a super-large-section tunnel body forms a large-section excavation hole profile 1. When the surrounding rock of the hole body is loose, the hole body will be excavated at a large section There is a vault collapse cavity 2 at the vault of profile 1. When the vault collapse cavity 2 has a large area and deep depth, it will seriously affect the initial support of the excavated cave body, so the traditional primary support measures are adopted. The expected effect cannot be achieved, and new hidden dangers of landslides will occur; the initial support concrete is first sprayed on the rock surface of the large-section excavation cave body outline 1 and the rock surface of the vault collapse cavity 2, and the vault cavity 2 The anchor cable support system 5 is set on the...

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Abstract

The invention discloses a side-top arch collapse cavity supporting system and method for a super-large-section tunnel in a plateau region. The aim of primary supporting of a side-top arch collapse cavity in a portal of the super-large-section tunnel in the plateau region is achieved. According to the system, the arch top collapse cavity (2) is formed in the arch top of a large-section excavated portal outline (1); a main arch supporting system (3) is arranged under the arch top of the large-section excavated portal outline; an auxiliary arch supporting frame (4) is fixedly welded to a main arch frame of the main arch supporting system (3); an anchor cable supporting system (5) is arranged at the outer edge of the arch top collapse cavity (2); an anchor rod supporting system (6) is arranged on the top of the arch top collapse cavity (2); and the rock surface of the large-section excavated portal outline (1) and the rock surface of the arch top collapse cavity (2) are provided with primary supporting concrete jet layers (7). By means of the system and method, the aim of primary supporting of the super-large-section tunnel in a water-rich rock stratum in the plateau region is achieved, and the effects that field construction is easy, supporting is stable and the project period is shortened are achieved.

Description

technical field [0001] The invention relates to a tunnel support system, in particular to a support system and a support method for the cavity collapse of a cave body after excavation of an extra-large section tunnel. Background technique [0002] When excavating super-large-section tunnels in water-rich rock formations in plateau areas, the surrounding rocks of the tunnel body are complex, and various surrounding rocks will be encountered during the excavation process. Due to the large section of the tunnel and the erosion of rock fissure water, when the excavation is completed, sometimes large-scale landslides will occur at the side and roof arches, forming a collapse cavity. In the initial support of the cave, if the traditional anchor rod, steel mesh and shotcrete initial support are used for the large-area collapse cavity, the support will be unstable, which will easily cause the entire sprayed concrete to collapse . In addition, due to the high cold and hypoxia in th...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D21/00
CPCE21D11/102E21D11/105E21D21/00
Inventor 贾峰史保真周飞王亮邹卫东郭政伟
Owner 中铁二十一局集团第六工程有限公司
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