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Advanced supporting and protecting technology for cracked top plate of digging operation face

A technology for excavating working faces and crushing roofs, which is applied to supporting the roof beams of mine roofs, mining equipment, earthwork drilling and mining, etc., can solve the problems of poor stability and low support strength, and achieve improved safety, convenient materials, and effective obvious effect

Inactive Publication Date: 2005-02-16
新汶矿业集团汶南煤矿有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies of low supporting strength and poor stability of the broken roof support in the existing mining face, the present invention provides a broken roof advanced support technology in the mining face, which can not only realize the advanced support of the broken roof before it is exposed It can improve the support strength, stability and reliability; at the same time, the existing drilling tools are basically used, and the operation is simple, simple and practical, and the effect is obvious

Method used

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  • Advanced supporting and protecting technology for cracked top plate of digging operation face
  • Advanced supporting and protecting technology for cracked top plate of digging operation face
  • Advanced supporting and protecting technology for cracked top plate of digging operation face

Examples

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Effect test

Embodiment 1

[0034] figure 1 Show the present invention's head-on broken roof advance roof protection technology, its operation method is as follows:

[0035] ① First, on the roadway contour line, determine the position of the front probe beam (1), that is, the drilled hole. When pointing the eyes, make the roadway top supporting anchor rod (4) in a straight line, and the borehole that is done for the front probe beam (1) is next to it. The spacing of boreholes, that is, the number of front probe beams (1) depends on the size of the roadway section. Generally, when the width of the roadway is below 3m, two groups are used; when it is more than 3m, three groups are used.

[0036] ②Use a large-diameter cone drill to drill holes, and the drilling direction should form an upward angle of 2-3° with the roof line, so that when the front probe beam is inserted into the roof, it will be in an upward state to enhance the support strength for the roof. Drilling depth is 200±100mm higher than the c...

Embodiment 2

[0047] Figure 4 , 5 Show the advance support technology of the broken roof of the coal mining face of the present invention, and its operation method is as follows:

[0048] ①In the gap of the regular pillar (15) on the coal mining face, first select the drilling position, that is, the position of the front beam (1): stick to the top of the working face; the distance between the drill holes, that is, the frame spacing of the front beam (1) (L), depending on the brokenness of the roof; when the roof falls seriously, it is controlled at about 1m, and when the roof is slightly better, it can be slightly larger.

[0049] ②According to the elevation angle direction of α=2~3° with the top plate, use a large-diameter cone drill to drill holes. The hole depth (h) should be about 200mm longer than the cycle footage. The diameter of the large-diameter cone drill bit is 130±3mm. The hexagonal hollow steel drill pipe and water-type shank are used for ore blending. It is driven by a coa...

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Abstract

An early support and protect technology for a dug-working-face broken-head plate includes the following steps: 1. closing to the head plate to determine the drilling position avoiding normal support, 2. carrying out wet drilling with large diameter cone driller driven by electric coal or wind coal drillers before exposing the head plate, its diameter is greater than the outward diameter of the from beam cross section and hole depth is larger than the cyclic length. 3. plugging the steels making the front beam or hinged bar into the front holes, 4. supporting or fixing the end outside of the hole of the front beam and fastening it with die square wood or wedges, which turns the early support from passive to active and increases the support strength, stability and reliability.

Description

Technical field [0001] The invention relates to an underground stope support technology of a coal mine, in particular to an advance support technology for a broken roof of a composite roof excavation face and an advanced roof protection excavation face with broken zones and cracks on the roof. Background technique [0002] Roof disaster, as one of the five natural disasters affecting mine safety production, has always been an accident-prone link. From the statistics of coal mine safety accident cases, roof accidents account for more than 40% of the accident probability. [0003] When the roof of the coal seam is broken, cracks are developed, and it is easy to fall, it will cause great difficulties in production, which not only poses a threat to personal safety, but also seriously affects mining production and causes huge losses in manpower and material resources. [0004] The roof support in the traditional mining and excavation production process mostly adopts the form of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D17/00
Inventor 张圣国刘笃鸿王孝勇
Owner 新汶矿业集团汶南煤矿有限责任公司
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