An anchor cable that can be repeatedly prestressed

Abstract

The invention discloses an anchor cable allowing prestress to be exerted repeatedly. The anchor cable comprises an anchor cable body, an anchoring device at the anchoring end, a support plate and a lock, wherein the anchor cable body is located at the outer end of a drilled hole and provided with a support plate and the lock. The anchor cable is characterized in that a T-shaped press pipe is further arranged at the outer end of the drilled hole of the anchor cable, and the support plate is pressed against a wing plate of the T-shaped press pipe; the anchoring device at the anchoring end is arranged at the position, close to the inner end, of the anchor cable body, a sleeve is arranged at the position, away from the upper portion of the anchoring device at the anchoring end by a certain distance, of the anchor cable body, and an annular space is formed by the sleeve and the anchor cable body; a soft grouting-stop plug is arranged at one end, close to the anchoring device at the anchoring end, of the sleeve. After the anchor cable is installed, the end, located in the drilled hole, of the T-shaped press pipe abuts against the sleeve in a sealed mode, and the anchoring device at the anchoring end can provide enough anchoring force to exert prestress on the anchor cable repeatedly. The prestress can be repeatedly exerted under the condition that a total-length grouting and solidifying structure is not disturbed, and the anchor cable is provided with the anchoring end with enough strength.

Description

technical field [0001] The invention relates to the field of mine surrounding rock support, in particular to an anchor cable to which prestress can be applied repeatedly in a mine roadway. Background technique [0002] Mine surrounding rock support is an extremely important and indispensable aspect in the field of underground resource mining. In recent years, coal mine mining accidents have occurred frequently, such as landslides and roof falls. These accidents are caused by inadequate technical measures and no effective measures have been taken. The technical measures or technical measures cannot be effectively implemented, and the surrounding rock support of mine mining is sufficient, and accidents caused by landslides and other surrounding rocks can be avoided. The main means of strengthening the surrounding rock in the prior art are bolt and cable support, grouting support, joint support of anchor net and cable, hydraulic support support, column support, leaving coal pil...

AI Technical Summary

Problems solved by technology

[0003] At present, my country's mines have entered deep mining, and surrounding rock support is particularly important in the mining process. However, when implementing anchor rod and anchor cable support, in order to increase the support effect of anchor rod and anchor cable, one end of the anchor rod cable is often grouted It is fixed in the deep part of the surrounding rock, and then full-length prestress is applied. However, when prestress is applied in the prior art, the end of the anchor cable rod is often required to be grouted for the first time, and then the prestress is applied for the first time, and then the full-length grouting is implemented again, and finally Prestressing is applied to the supporting plate on the outer end, which will disturb the surrounding rock support many times, and will loosen the solidified grouting fluid and the anchor cable rod, destroying the solidified structure of the grouting slurry, and the effect of the anchoring and grouting support structure is not good. not ideal

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