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Bent-frame preliminary supporting structure for weak surrounding rock tunnel and supporting method

A technology of primary support and weak surrounding rock, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of large material waste, high tunnel construction cost, unsafe construction, etc., and achieve reduced construction costs, simple construction, and The effect of easy installation

Inactive Publication Date: 2016-12-14
NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a bent-type initial support structure and support method for weak surrounding rock tunnels in view of the problems of large material waste, high tunnel construction cost, and unsafe construction in the existing weak surrounding rock tunnel support methods.

Method used

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  • Bent-frame preliminary supporting structure for weak surrounding rock tunnel and supporting method
  • Bent-frame preliminary supporting structure for weak surrounding rock tunnel and supporting method
  • Bent-frame preliminary supporting structure for weak surrounding rock tunnel and supporting method

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] see Figure 1 to Figure 4 , a bent-type initial support structure for weak surrounding rock tunnels, which is suitable for the initial support engineering of tunnels with weak surrounding rocks, comprising an H-shaped steel arch 2, and a set of Multi-section longitudinal distribution beams 3 form a bent structure, and then make the H-shaped steel arch 2 form an overall structure, reducing horizontal convergence and vertical settlement of surrounding rock.

[0029] The longitudinal distribution beam 3 is welded to the H-shaped steel arch frame 2 .

[0030] see Figure 2 to Figure 4 , the grooved connecting plate 6 is 10# channel steel.

[0031] see Figure 1 to Figure 4 , in order to facilitate the construction, reduce the thickness of the support structure as far as possible, avoid the excessive increase of the excavation c...

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Abstract

The invention provides a bent-frame preliminary supporting structure for a weak surrounding rock tunnel and a supporting method. The supporting structure comprises an H-shaped steel arching (2), wherein multiple sections of longitudinal distribution beams (3) are arranged outside the H-shaped steel arching (2) along a tunnel outline line. The supporting method comprises the steps that multi-step divided excavation is conducted; a spacing and specifications of the H-shaped steel arching (2), as well as the spacing between the longitudinal distribution beams (3) are determined, so that the H-shaped steel arching (2) can be connected with the longitudinal distribution beams (3), and a bent-frame support can be formed; and binding protection is conducted to connection heads of the longitudinal distribution beams (3), and then concrete jetting is carried out. Collapse risks are reduced when lower steps are excavated and upper arch feet are suspended.

Description

technical field [0001] The invention relates to a support structure, more specifically to a bent-type initial support structure and a support method for tunnels with weak surrounding rocks, and belongs to the technical field of initial support for tunnel construction. Background technique [0002] The traditional primary support forms for tunnels with weak surrounding rocks include shotcrete supported by grid frames and shotcrete supported by steel arches. In the primary support of surrounding rock tunnels, the lower the grade of the surrounding rock of the tunnel, the higher the selected support parameters, and sometimes several support measures need to be used in combination. [0003] However, in tunnels where the surrounding rock is very weak, the ground stress is very high or even the deformation is very large, these support systems will often be damaged. For this, partial excavation methods such as multi-step, CRD or double-side-wall pilot pits are generally adopted. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18
CPCE21D11/18
Inventor 游国平
Owner NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP
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