Gob-side entrydriving coal pillar anchor cable through reinforcing method

A technology of anchor cables and coal pillars, which is applied in the direction of earthwork drilling, bolt installation, mining equipment, etc., can solve the problems of high labor intensity of workers, difficulty of roadway support, lack of support means, etc., and achieve outstanding anchoring effect, The effect of ensuring stability

Inactive Publication Date: 2014-07-02
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: ①The support of the roadway is very difficult, and a "separation wall support body" needs to be built along the side of the goaf. The separation wall support body should not only support the roof of the roadway, but also isolate the roadway. and the role of the goaf; ② support body partition wall support is difficult to achieve mechanization, labor intensity is relatively high
[0004] Gobside excavation relies on narrow coal pillars to support the roof of the roadway, so it is necessary to strengthen the support for narrow coal pillars, and there is a lack of effective support means in the prior art

Method used

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  • Gob-side entrydriving coal pillar anchor cable through reinforcing method
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  • Gob-side entrydriving coal pillar anchor cable through reinforcing method

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specific Embodiment approach

[0017] The method for cross-penetration reinforcement of coal pillar anchor cables in gob-side roadway of the present invention, its preferred specific implementation mode is:

[0018] Include steps:

[0019] Such as Figure 1 to Figure 3 As shown, in the upper section, drill holes along the trough to the coal pillar (that is, the narrow coal pillar with a width of 4-6m to be reserved as the "separation wall support body"), and install pre-installed anchors in the borehole cable, and on the coal wall on one side of the drill hole, spray the concrete spraying layer, install the fine mesh, install the steel mesh and the anchor tray, and the lock at the outer end of the anchor cable is fixed on the anchor tray;

[0020] After the tunneling in the lower section is completed, the preset anchor cable in the borehole is lengthened, and finally the same process as above is carried out to complete the anchoring work.

[0021] The reason why the anchor cable lengthening technology is ...

specific Embodiment 1

[0032] Such as figure 1 , figure 2 and image 3 As shown, drilling holes are drilled into the coal pillar in the lower channel (along channel A) in the upper section, and the pre-installed anchor cables are installed. Then, the concrete shotcrete is sprayed on the side of the coal wall of the channel A in sequence, and the fine mesh and steel mesh are installed. And the anchoring tray to complete the anchoring work. After the excavation of the upper channel (along channel B) in the lower section is completed, the preset anchor cables in the coal pillar boreholes are extended, and finally the same process as above is carried out to complete the anchoring work.

[0033] In the present invention, the anchor cable cross-penetration reinforcement technology can be used in gob-side excavation to apply a large anchoring force to the coal pillar, improve the support strength of the coal pillar, and ensure the long-term stability of the coal pillar. In addition, the technology is c...

specific Embodiment 2

[0034] Such as Figure 4 As shown, the telescopic anchor cable is adopted, and the construction method is basically the same as the technical solution in the first embodiment. The preset anchor cable in the coal pillar anchor cable borehole adopts a retractable anchor cable. After the tunneling of the lower section is completed, the anchor cable is lengthened at the end close to the side of the newly excavated roadway B; the anchor cable Opposite gesture Figure 4 .

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Abstract

The invention discloses a gob-side entrydriving coal pillar anchor cable through reinforcing method. A drilled hole is punched in a coal pillar in a down trough of an upper zone, a preset anchor cable is arranged in the drilled hole, concrete spraying layer spraying, thin hole pattern mounting, bar-mat reinforcement mounting and anchorage tray mounting are sequentially carried out on the side, punched with the drilled hole, of the coal wall, and a tapered end of the outer end of the anchor cable is fixed to an anchorage tray. After an up trough of a lower zone is tunneled, the preset anchor cable in the drilled hole of a new-tunneled roadway is lengthened, finally the same working procedure is executed, and the anchorage work is completed. The length of the preset anchor cable in the anchor cable drilled hole is smaller than the width of the coal pillar, and the length of the anchor cable drilled hole is larger than the width of the coal pillar. According to the lengthening process of the preset anchor cable, two segments of the anchor cable can be lengthened through a connecting device, or a telescopic anchor cable can be adopted, or a flexible and bendable anchor cable can be adopted. According to the coal pillar anchor cable through reinforcing method, the anchorage effect is obvious, and the stability of the coal pillar can be effectively ensured.

Description

technical field [0001] The invention relates to a method for reinforcing cross-piercing anchor cables of coal pillars in gob-side excavation, in particular to a method for reinforcing cross-penetration of coal pillars in gob-gob driving. Background technique [0002] Gobside entry retaining technology has significant technical advantages and economic benefits, which can increase the recovery rate of coal resources, reduce the amount of roadway excavation, relieve the tension of mining continuity and eliminate the stress concentration of coal pillars. It is an important roadway protection technology that is beneficial to mine safety production and cost reduction and benefit increase. The disadvantages are: ①The support of the roadway is very difficult, and a "separation wall support body" needs to be built along the side of the goaf. The separation wall support body should not only support the roof of the roadway, but also isolate the roadway. The role of goaf and goaf; ② Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/02
Inventor 高延法刘珂铭何晓升徐斌经
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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