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Roof-cutting and roadway-retaining cooperative anchor protection structure and construction method thereof

A construction method and anchor protection technology, which are applied in the directions of bolt installation, earth-moving drilling, ground mining, etc., can solve the problems of poor stability and adaptability of the roadway retaining structure, poor applicability of the roadway retaining technology, and prone to roof accidents. , to achieve the effect of improving stability and adaptability, improving stability and adaptability, and simple structure

Active Publication Date: 2020-12-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a collaborative anchor protection structure for roof cutting and entry retaining and its construction method, which is used to solve the problems of poor stability and adaptability, large deformation, high control cost and prone to roof accidents in current entry retaining structures. Major problems such as poor applicability of the existing lane retention technology

Method used

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  • Roof-cutting and roadway-retaining cooperative anchor protection structure and construction method thereof
  • Roof-cutting and roadway-retaining cooperative anchor protection structure and construction method thereof
  • Roof-cutting and roadway-retaining cooperative anchor protection structure and construction method thereof

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Embodiment 1

[0073] A specific embodiment of the present invention discloses a roof cutting and retaining cooperative anchor protection structure and its construction method that significantly enhance stability and adaptability, including the following steps:

[0074] Step S1: Through the research on the roof cutting principle of the roadway roof pre-splitting blasting, in order to reduce the damage to the roof of the roadway caused by the roof collapse of the goaf during the mining of the working face, the direct roof in the roadway and the roof of the working face are first carried out. Pre-split by directional blasting, cut off the mechanical connection between the direct roof and the roof of the working face, and reduce the damage to the roof in the roadway caused by the collapse of the roof in the goaf after mining. The blasting pre-splitting between the direct roof in the roadway and the roof of the working face includes the following steps:

[0075] Step S11: Before mining at the wo...

Embodiment 2

[0128] Yet another specific embodiment of the present invention discloses a collaborative anchoring structure for roof cutting and roadway retention, which is constructed using the construction method in Example 1. The supporting structure 12 is composed of two substructures; the roadside cooperative anchoring structure 11 is composed of roof anchor beam 13, roadside reinforcing beam 14, and coal side anchoring body 15; The protection body 16, the roof cutting support body 17, and the gangue support body 18 are composed of three secondary substructures.

[0129] figure 2 It shows three sub-structures of roof anchor beam 13, roadside reinforced beam 14, and coal side anchor body 15 of roadside cooperative anchoring structure 11, as well as gangue retaining body 16 and roof cutting structure 12 of roadside cooperative support structure 12. The spatial positional relationship of the three secondary substructures of the supporting body 17 and the gangue supporting body 18. By s...

Embodiment 3

[0135] The pre-split roof cutting effect of directional blasting is one of the key factors determining the effectiveness of gob-side entry retention. It is necessary to design reasonable blasting positions and blasting parameters to promote the formation of good through-cracks between adjacent blastholes and significantly reduce the number of goaf roofs. The influence and degree of damage to the roof of the roadway during the collapse are also conducive to the full collapse of the roof in the goaf, thereby significantly enhancing the stability, adaptability and applicability of the anchorage structure of the gob-side entry retention. A specific embodiment of the present invention discloses the blasthole plugging device in step S14 in embodiment 1, which can detachably plug the blasthole 1 and facilitate the detection of the effect of pre-splitting blasting, such as Figures 4 to 9 As shown, the blasthole blocking device includes a blasthole internal damping device and a blastho...

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Abstract

The invention discloses a roof-cutting and roadway-retaining cooperative anchor protection structure and a construction method thereof, and belongs to the technical field of roadway tunneling and supporting. The roof-cutting and roadway-retaining cooperative anchor protection structure and the construction method thereof solve the problems that an existing roadway-retaining structure is poor in stability and adaptability, large in deformation, high in control cost, prone to roof accidents, not high in applicability of an existing roadway-retaining technology and the like. The construction method comprises the steps that directional blasting presplitting is conducted between an in-roadway direct roof and a working face roof, and the mechanical connection between the direct roof and the working face roof is cut off; the roof-cutting and roadway-retaining cooperative anchor protection structure composed of an in-roadway cooperative anchoring structure and a roadside cooperative supportingstructure is constructed on the in-roadway direct roof and the adjacent working face roof which are subjected to blasting presplitting; and a roadway-retaining closed structure is synchronously constructed on the outer side of a gangue-blocking supporting body, and construction of the roof-cutting and roadway-retaining cooperative anchor protection structure is completed. According to the roof-cutting and roadway-retaining cooperative anchor protection structure and the construction method thereof, construction is easy and convenient to conduct, the anchor protection cost is low, the controlproblems of the stability, the adaptability and the applicability of a coal mine gob-side entry retaining structure are solved, and the high application and popularization value is achieved.

Description

technical field [0001] The invention relates to the technical field of roadway excavation and support, in particular to a roof cutting and roadway retaining collaborative anchor protection structure and a construction method thereof. Background technique [0002] For a long time, my country's coal mines mainly adopt the coal pillar mining method, resulting in the loss of mined coal accounting for about 40% of the total coal loss of the whole mine. However, adopting the method of retaining roadway along the goaf can increase the recovery rate of the mining area by 10-20%, reduce the roadway excavation rate by 25-30%, and effectively solve the problems of gas control and mining imbalance. The economic benefits and technical advantages are significant and better. To fully meet the needs of safe, economical, efficient, green and sustainable mining. [0003] Improving the stability and adaptability of the anchor retaining structure is the key to determine the effect and populari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21D11/14E21D11/15E21D20/00F42D1/08F42D1/18F42D3/04
CPCE21C41/18E21D11/14E21D11/152E21D20/00F42D1/08F42D1/18F42D3/04
Inventor 龙景奎刘碧雁吴家来曹佐勇乞朝欣郭厚亮兰红纪少思徐再刚谢晶肖国强冯会杰梁勇生赵春
Owner CHINA UNIV OF MINING & TECH
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