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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 the effect of saving cost, large space, and speeding up construction progress.

Active Publication Date: 2012-07-18
THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY +1
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  • Abstract
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  • Claims
  • 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 passage in the central and southern parts of Shanxi Province, is mainly composed of sandstone, argillaceous sandstone and mudstone. It is strongly weathered to weakly weathered, joints and fissures are developed, the rock mass is broken and the structure is loose. The intersection of No. 1 inclined shaft and the main tunnel is rich in water , the vault is easy to lose blocks and collapse, it is a weak and broken rock formation, and the inclined well and the main hole are obliquely intersected. It is designed as a small guide hole roofing scheme, and a shed hole is provided for temporary support.

[0032]After analysis, the surrounding rock structure of the overhanging section is complex, the rock mass is broken, and the water is rich, and the safety risk is extremely high. If the design of the roof is adopted, the main problems are: the temporary support section of the steel arch shed for the small pilot tunnel is trapezoi...

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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 roof lifting construction of inclined wells, in particular to a construction method of arc guide roof lifting on inclined inclined shafts in soft broken rock formations. Background technique [0002] For the roof construction of inclined shafts, the method of roofing with small guide holes is usually adopted: temporary support of steel arch sheds is provided, after the excavation and temporary support of small guide holes in the upper guide range are completed, the steel arch frame is installed, and then the steel arch frame is removed. Temporary support for the shed tunnel, excavation to both sides, and initial support for the construction of the positive tunnel. For the inclined inclined shaft in the soft and broken rock formation, the above method has certain limitations, mainly in the following: the small pilot hole is temporarily supported by the steel arch shed, and the cross-section of the shed is trapezoid....

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/18E21D11/10E21D19/00
Inventor 王兴林雷军
Owner THE 2ND ENG OF THE 12TH BUREAU GROUP OF CHINA RAILWAY
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