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Oblique-crossing inclined shaft upper arc guide top brushing construction method for soft crushed rock layer

A construction method and technology for inclined wells, which are applied in wellbore lining, shaft equipment, earth-moving drilling, etc., to achieve significant economic benefits, speed up construction progress, and optimize stress-bearing structures.

Active Publication Date: 2014-04-23
2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the roofing construction of oblique shafts in weak and broken rock formations, the present invention usually adopts the method of roofing with small pilot holes, and provides a construction method for the arc-guided roofing of inclined shafts in weak and broken rock formations.

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  • Oblique-crossing inclined shaft upper arc guide top brushing construction method for soft crushed rock layer
  • Oblique-crossing inclined shaft upper arc guide top brushing construction method for soft crushed rock layer
  • Oblique-crossing inclined shaft upper arc guide top brushing construction method for soft crushed rock layer

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[0031] The whole tunnel of Wujialing Tunnel, a railway channel in central and southern Shanxi, is mainly composed of sandstone, argillaceous sandstone, and mudstone. It is strongly weathered to weakly weathered, with developed joints and fissures, broken rock mass, and loose structure. The intersection of the No. 1 inclined shaft and the main tunnel is rich in water , The vault is easy to fall off and collapse. It belongs to weak and broken rock formations. The inclined shaft and the main cave are obliquely intersected. The design is a small pilot tunnel roofing scheme, with temporary support for the shed hole.

[0032]After analysis: the surrounding rock structure of the top section is complex, the rock mass is broken and rich in water, and the safety risk is extremely high. If the design roofing scheme is adopted, the main problems are: the temporary support section of the small pilot tunnel steel arch shed tunnel is trapezoidal, which is easy to collapse in the weak and bro...

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Abstract

The invention relates to the field of inclined shaft top brushing, in particular to an oblique-crossing inclined shaft upper arc guide top brushing construction method for a soft crushed rock layer, and solves the problems of the existing inclined shaft top brushing construction adopting small pilot tunnel top brushing. The method comprises the following steps of: setting curve transition at the intersection of an inclined shaft and a front tunnel so that an inclined shaft mouth is orthogonal with the front tunnel; arranging a door-shaped steel frame support at the intersection, wherein a steel arch frame of the front tunnel is firmly connected with the door-shaped steel frame; arranging a cover arch support at the section close to the front tunnel and inclined shaft; additionally arranging an I-shaped steel cross arm on a bottom plate; performing top brushing by use of an upper arc guide within the front tunnel range, wherein the last arch frame of the upper arc guide is vertical to the line direction, and the arch top is level with the arch top of the front tunnel; performing expanded excavation along the cross section of the front tunnel, and constructing an upper guide primary support of the front tunnel; reversely dismantling the steel arch frame temporary supports of the upper arc guide one by one, and constructing an upper guide primary support of the front tunnel on the other side; and performing normal construction within the front tunnel range to finish the top brushing. Through the invention, the working efficiency is improved, the construction is accelerated, the safety risk is lowered, the inclined shaft top brushing construction is safely, quickly, perfectly and efficiently finished, and a good effect is obtained.

Description

technical field [0001] The invention relates to the field of overhead construction of inclined shafts, in particular to a construction method for arc-guided overhead construction of oblique shafts with weak and broken rock formations. Background technique [0002] The roofing construction of the inclined shaft usually adopts the method of raising the roof with a small pilot hole: set up temporary support for the shed hole of the steel arch frame, and after the excavation of the small pilot hole and the temporary support within the upper guide range are completed, the steel arch frame is installed, and then the steel arch frame is removed For the temporary support of the shed hole, the excavation is expanded to both sides, and the initial support is guided upwards in the main tunnel. For inclined wells with weak and broken rock formations, the above methods have certain limitations, mainly in the following: the small pilot tunnel is temporarily supported by a steel arch shed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/04E21D11/18E21D11/10E21D19/00
Inventor 王兴林雷军
Owner 2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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