Coal pillar reinforcement system for gob-side entry driving and use method thereof

Abstract

The invention discloses a coal pillar reinforcement system for gob-side entry driving and a use method thereof and belongs to the technical field of coal mine gob-side entry driving supports. The system comprises coal pillar reinforcement anchor cables, grouting drill holes, a grouting monitoring device and a grouting machine, wherein the coal pillar reinforcement anchor cables include anchoring segments, free segments and block gangue devices; each anchoring segment includes an airbag, a front fixing ring, a rear fixing ring and a grouting hole, wherein the front fixing ring and the rear fixing ring are used for fixing the airbag, the front fixing ring is located at the front end of the airbag, the rear fixing ring is located at the rear end of the airbag, and the grouting hole is formedin the rear fixing ring; each free segment includes a steel strand, a tray, a lock and an inner grouting pipe, one end of each inner grouting pipe is connected with the corresponding grouting hole, the other end of each inner grouting pipe is connected with the grouting monitoring device, each airbag is arranged in the length direction of the corresponding steel strand, and the outer circumferenceface of each steel strand is coated with the corresponding airbag. According to the system, coal pillar reinforcement in gob-side entry driving in one direction can be carried out, and the stabilityand bearing capacity of coal pillars are improved.

Description

Technical field [0001] The invention belongs to the technical field of roadway driving along goaf support in coal mines, and specifically relates to a coal pillar reinforcement system for roadway driving along goaf and a use method thereof. Background technique [0002] With the increase in the degree of mechanization of coal mining, the increase in mine production and mining depth, the requirements for coal recovery rate and roadway support technology are getting higher and higher, and the traditional layout of leaving wider sections of coal pillars to protect the roadway The method can no longer meet the requirements. Keeping narrow coal pillars and driving along the gob is one of the effective methods to increase the coal recovery rate. Roadway driving along the goaf is a roadway that is driven along the edge of the goaf after the mining impact caused by the upper section of the working face is stabilized. Roadway driving along goaf technology has many advantages, such as hi...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, a series of technical improvements have been made for the reinforcement of gob-side roadway coal pillars. Using the anchor cable cross-penetration reinforcement technology can exert a large anchoring force on the coal pillar, improve the support strength of the coal pillar, and ensure the long-term stability of the coal pillar. However, this method needs to be carried out on the coal pillar in advance after the mining of the upper section is completed. Drilling holes and installing preset anchor cables is a cumbersome process. In addition, there is inaccurate width reservation of the coal pillars in the crossing roadway. If the error is large, the cross-penetration reinforcement cannot be carried out; (2) CN201710035988.9 discloses a coal pillar for roadway digging along the gob The two-way reinforcement method uses the expansion-locking anchor cable to realize the two-way reinforcement of the reserved coal pillar, and the construction can be completed on one side of the reserved coal pillar. In this method, the design of the expansion-lock cross-piercing anchor cable is relatively complicated, and it is impossible to know the pressure in the expansion bag during grouting in real time, and the expansion bag is easily crushed by the gangue in the goaf before grouting, making grouting difficult , resulting in the impossibility of two-way reinforcement of the coal pillar. In addition, when the coal pillar is broken, this method can only reinforce the two sides of the coal pillar, and cannot achieve internal reinforcement of the coal pillar, which greatly reduces the stability and bearing capacity of the coal pillar.

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