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Loose broken tunnel top plate reinforcing and supporting method

A roadway roof, soft technology, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve the problems of difficult coal roadway support, roof collapse, easy weathering and breaking, etc., to improve local stability, improve overall performance, avoid The effect of local buckling

Inactive Publication Date: 2013-04-24
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the roof soft rock does not fall temporarily during the excavation stage, it is easy to be weathered and broken, and there are problems such as difficult support in the coal roadway, large deformation of the surrounding rock, serious damage, and high maintenance costs.
At present, most of them adopt conventional methods, such as anchor rod + shotcrete support, shrinkable U-shaped steel bracket and grouting technology behind the shed, high-strength anchor rod / anchor cable, anchor mesh and spray composite support technology, etc. These support technologies have no Solve the coupling problem between the support structure and the mechanical properties of the surrounding rock mass, resulting in continuous growth of surrounding rock deformation, extrusion deformation of the roadway, and roof collapse

Method used

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  • Loose broken tunnel top plate reinforcing and supporting method
  • Loose broken tunnel top plate reinforcing and supporting method
  • Loose broken tunnel top plate reinforcing and supporting method

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Embodiment Construction

[0029] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, the method of the present invention is applied to the reinforcement and support of the roof of the soft and broken surrounding rock roadway. The method can effectively control the sinking amount of the roof and reduce the occurrence of roof fall accidents.

[0031] A. Excavate the roadway, remove the dangerous rocks on the surface of the roadway, and seal the crack surface of the surrounding rock with shotcrete;

[0032] B. Carry out grouting bolt 2 construction. First, make grouting holes at 0.3-0.5 meters from the left and right side walls on the roof that is prone to collapse in the roadway, with an elevation angle of 45°; make grouting holes at the upper part of the left and right side walls at a distance of 0.3-0.5 meters from the roof, with an elevation angle of 30°; Make a grouting hole at the bottom of the left ...

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Abstract

The invention discloses a loose broken tunnel top plate reinforcing and supporting method, and belongs to mine tunnel supporting methods. The method includes: spraying concrete on the surface of a loose broken tunnel top plate, adopting anchor bolt supporting and hollow anchor pipe grouting to support top plate surrounding rock, laying a steel fabric piece, and respraying concrete on a leveling layer; laying a flexible cushion layer appressed with the leveling layer, and reserving deformation amount between the flexible cushion layer and the leveling layer; and paving an anchor-tensioning support on the top plate. The anchor-tensioning support is composed of a pre-stressed anchor rope and multi-sections of corrugated steel web box-shaped beams, elastic connecting parts are adopted to connect adjacent sections, the anchor bolt / anchor rope penetrates through a reserved anchor hole anchoring rock layer on a pull rod, the whole anchor rope is pasted and applied with prestress, and the anchor-tensioning support is arranged parallelly along the direction of a tunnel. By the method, problems that the broken top plate is sunk greatly and supporting of conventional mining I-steel pull rods and flat steel box-shaped pull rods is quite prone to damages are solved, so that stability and safety of top plate supporting are effectively guaranteed, and economic benefit is evident.

Description

Technical field [0001] The invention relates to a method for supporting a mine roadway, in particular to a method for reinforcing and supporting soft and broken roadway roofs, which can be used for reinforcing and supporting weak and broken surrounding rocks in mine roadways and deep-buried tunnel projects. Background technique [0002] In recent years, as energy mining goes deep, surrounding rocks deteriorate, and mining conditions become more and more difficult. In particular, the roof control and management of soft and broken roadways have always plagued mine production safety. [0003] The soft and broken roof surrounding rock has extremely well-developed bedding, joints and fissures, and poor consolidation, so the roof of the roadway is prone to collapse with excavation. Even if the roof soft rock does not fall temporarily during the excavation stage, it is easy to be weathered and broken, and there are problems such as difficult support in the coal roadway, large defo...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D21/00
Inventor 魏建军刘聘刘辉韩成标
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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