Anchor cable supporting method for repeated application of prestress

Abstract

The invention discloses an anchor cable supporting method for repeated application of prestress. An anchor cable comprises an anchor cable body, an anchoring end anchoring device, a supporting plate and a lockset. The end, located outside a drill hole, of the anchor cable body is sequentially provided with the supporting plate and the lockset. The anchor cable is characterized in that a T-shaped pressing pipe is further arranged at the end, located outside the drill hole, of the anchor cable body, the supporting plate abuts against a wing plate of the T-shaped pressing pipe in a pressing mode, the portion, close to the inner end of the drill hole, of the anchor cable body is provided with the anchoring end anchoring device, a casing pipe is arranged at the position, at a certain distance of the upper portion of the anchoring end anchoring device, of the anchor cable body, an annular space is formed between the casing pipe and the anchor cable body, and the end, close to the anchoring end anchoring device, of the casing pipe is provided with a flexible grout stopper; after the anchor cable is installed, the end, located inside the drill hole, of the T-shaped pressing pipe abuts against the casing pipe in a sealing mode, and the anchoring end anchoring device can provide enough anchoring force so as to meet the requirement for repeatedly applying the prestress on the anchor cable. The anchor cable supporting method mainly comprises the steps of manufacturing and installing the anchor cable, conducting primary grouting, conducting secondary grouting and repeatedly applying the prestress. According to the anchor cable supporting method, the prestress can be repeatedly applied at the anchoring end with enough strength under the condition that an overall-length grouting solidification structure is not disturbed.

Description

technical field [0001] The invention relates to the field of mine surrounding rock support, in particular to an anchor cable support method in which prestress is repeatedly applied to 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, leavi...

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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