Anchor rope total length anchoring method for coal mine soft rock roadway

Abstract

The invention discloses an anchor rope total length anchoring method for a coal mine soft rock roadway. The method comprises the steps of performing construction and drilling a hole in a tunneling working face of the soft rock roadway, installing an anchor rope in the well constructed drilled hole according to convention, placing a Z-shaped grouting pipe on an orifice of the grouting drilled hole, laying a reinforcing mesh attached to the surface of the roadway around the orifice of the grouting drilled hole, installing a tray and a lock at an exposed end of the anchor rope, and applying pretightening force on the anchor rope; spraying slurry on the surface of the soft rock roadway, enabling a sprayed layer on the surface of the soft rock roadway to be covered on an outer wall of the grouting drilled hole; and after the sprayed layer is stabilized, grouting the grouting drilled hole through an exposed port of the Z-shaped grouting pipe until the slurry is filled in the drilled hole to achieve total length anchoring of the anchor rope. Finally, effects of reinforcing a surrounding rock structure, improving surrounding rock bearing capability and controlling surrounding rock deformation are achieved.

Description

technical field [0001] The invention relates to a method for controlling the surrounding rock of a mine roadway, in particular to a full-length anchorage of an anchor cable suitable for soft rock roadways in coal mines, and also suitable for roadways with poor surrounding rocks, large-section chambers, intersection points, and fault zones. Nearby and roadways affected by dynamic pressure. Background technique [0002] Due to poor rock cementation, low rock strength, well-developed joints, broken rock mass and severe mine pressure in soft rock roadway, it is difficult to maintain the roadway. The existing hollow grouted anchor cable can realize the full-length anchoring of the anchor cable. The cable body is a hollow structure with a grouted core tube, resulting in a smaller breaking load of the anchor cable, which is 31% lower than that of the same diameter anchor cable. It is easy to be pulled off in field use. Another disadvantage is that the anchor cable adopts the thre...

AI Technical Summary

Problems solved by technology

The existing hollow grouted anchor cable can realize the full-length anchoring of the anchor cable. The cable body is a hollow structure with a grouted core tube, resulting in a smaller breaking load of the anchor cable, which is 31% lower than that of the same diameter anchor cable. Easy to be pulled off in field use

Another disadvantage is that the anchor cable adopts the thread locking method, and the installation and pre-tightening method of the anchor cable are the same as those of the resin anchor rod, resulting in a small pre-tightening force and weak active support, which cannot significantly improve the bearing capacity of the surrounding rock

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