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Loose and weak surrounding rock combined bolting and shotcrete structure and construction method

A technology of weak surrounding rock and shotcrete anchor support, applied in tunnels, tunnel lining, bolt installation, etc., can solve problems such as easy collapse and failure of bolts, achieve uniform force, good support effect, and improve support effect of structure

Inactive Publication Date: 2016-12-21
何双龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects in the prior art that the surface of the loose and weak roadway is easy to collapse and cause the failure of the bolt, and to provide a loose and weak surrounding rock roadway with a sprayed anchor support structure and a construction method

Method used

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  • Loose and weak surrounding rock combined bolting and shotcrete structure and construction method
  • Loose and weak surrounding rock combined bolting and shotcrete structure and construction method

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Embodiment

[0021] A construction method for a spray-bolt support structure in a roadway with loose and weak surrounding rocks, comprising the following steps: ① construction and forming of the roadway; ② spraying a flexible spray layer 2 on the surface of the roadway. In this application, polyurethane resin material is used as an example, with a thickness of 30 -80mm, so that the surrounding rock surface of the roadway forms a flexible whole; ③ add a steel belt 4, and construct a high-strength left-handed non-longitudinal rib threaded steel anchor 3, the row spacing is less than 1000 mm, and the deviation is ± 100 mm; the anchor 3 is perpendicular to the rock wall, the deviation is less than 10°, anchor rod 3 is anchored with resin anchoring agent, the anchoring force is not less than 100kN, and the pre-tightening force is not less than 80kN; ④Construction anchor cable 1, anchor cable 1 is anchored with resin anchoring agent, and the anchoring force is not low At 250kN, the pretightening ...

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Abstract

The invention relates to the field of coal mine roadway support, a loose and weak surrounding rock roadway sprayed anchor support structure, including a flexible sprayed layer, steel strips, anchor rods and anchor cables, the flexible sprayed layer is sprayed on the surface of the roadway, and the The steel belt is arranged on the surface of the flexible sprayed layer, and the anchor rod and the anchor cable pass through the steel belt and the flexible sprayed layer and are inserted into the inside of the roadway for fixing. Beneficial effects: By spraying the flexible spray layer on the surface of the surrounding rock roadway, the loose and weak surrounding rock can be bonded into a flexible whole, preventing the anchor during the process of installing the bolt, applying pre-tightening force to the bolt or after being subjected to mine pressure. The collapse of the surrounding rock near the end of the pole causes the failure of the support. Fill the surface of the surrounding rock to make the force on the surface of the surrounding rock uniform, improve the support structure, and play a role in sealing the surrounding rock and isolating the weakening effect of Fengshui on the surrounding rock. The use of weak coal mine roadway has a good supporting effect.

Description

technical field [0001] The invention relates to the field of coal mine roadway support, in particular to a spray-bolt support method for loose and weak surrounding rock roadways. Background technique [0002] When the bolts in the coal mine roadway construction with very loose and weak surrounding rocks are supported by end anchors, the surrounding rocks near the ends of the bolts are prone to collapse during the process of installing the bolts and applying pre-tightening force to the bolts, or after being subjected to mine pressure. The anchor rod fails accordingly, and the traditional hanging barbed wire or steel mesh cannot effectively solve this problem. Contents of the invention [0003] The purpose of the present invention is to overcome the defects in the prior art that the surface of the loose and weak roadway is easy to collapse and cause the failure of the bolt, and to provide a spray-bolt support structure and construction method for the roadway with loose and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/14E21D20/00
CPCE21D11/00E21D11/14E21D20/00
Inventor 何双龙
Owner 何双龙
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