A telescopic cross-piercing anchor cable for two-way reinforcement of coal pillars

Abstract

The invention discloses a telescopic two-ended anchor cable for two-direction reinforcing of a coal pillar. The anchor cable comprises an anchor cable front section, an anchor cable rear section and a telescopic sleeve. The telescopic sleeve comprises a fixed sleeve and a connection sleeve. The connection sleeve is an internal thread metal pipe. The fixed sleeve is an external threaded metal pipe. The two metal pipes are connected through threads. The connection sleeve is connected with the anchor cable front section. The fixed sleeve is connected with the anchor cable rear section. The anchor cable rear section comprises a rear anchor cable body. A wedge-shaped rubber clamping ring is arranged at the inner end of the rear anchor cable body. A wedge-shaped opening is formed in the inner end of the fixed sleeve. After penetrating into the fixed sleeve, the inner end of the rear anchor cable body is clamped to the wedge-shaped opening through the wedge-shaped rubber clamping ring. The two-ended anchor cable is drilled into one side of the coal pillar in a goaf, the other side of the coal pillar is tunneled after a period of time, the rear section of the two-ended anchor cable is stretched or lengthened and fixed, in this way, even the two sides of the coal pillar are not constructed at the same time, the purpose of reinforcing the coal pillar in two directions can also be achieved, and the supporting capacity of the coal pillar to a top plate is greatly improved.

Description

technical field [0001] The invention relates to a coal pillar reinforcement technology, in particular to a telescopic cross-piercing anchor cable for bidirectional reinforcement of a coal pillar. Background technique [0002] Gob-side tunneling technology refers to leaving a 4-6m coal pillar close to the goaf as a "separation wall support body", and excavating the roadway along the other side of the coal pillar to replace the previous 15-30m wide coal pillar, which can improve Improve the recovery rate of coal resources and reduce the stress concentration area on the coal pillar. Its advantages are: ①Coal pillars are used as the "separation wall support body". Compared with the gob-side entry retention, no separation wall needs to be built manually, which avoids construction difficulties, avoids the transportation of support materials, and saves support materials cost. ② Now the construction efficiency of fully mechanized excavator in coal roadway is high. Under the genera...

AI Technical Summary

Problems solved by technology

Due to the difference of at least one year in the construction time of the mining works on both sides of the coal pillar, the side of the gob has already been closed during the construction of the new excavation side, and the existing anchor cables cannot complete the cross-penetration reinforcement of the coal pillars, and there are no cross-piercing anchor cables available

[0004] Some rock masses in the prior art have used cross-piercing anchor cables for two-way reinforcement. This technology must be constructed on both sides of the rock mass at the same time. If it cannot be constructed at the same time, two-way reinforcement cannot be achieved.

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