A joint support method and system for blasting and grouting at the end of a steel pipe anchor cable

Abstract

The invention belongs to the technical field of roadway support, and discloses a steel pipe anchor cable end blasting and grouting combined support method and system, by blasting the anchor cable end protruding from the grouted steel pipe in the support borehole, and cooperating The grouting rod is anchored at the end. After the end anchor is successful, the anchor cable is fixed through the flange, and several anchor cables are twisted into one strand by rotating the flange and the drilling rig, and then the flange and the flange are fixed with high-strength bolts. The relative position of the trays provides high preload for the overall support. The steel pipe of the present invention is coupled with the wall of the hole, which not only achieves the effect of resisting rock layer shear displacement, but also avoids the direct contact between the anchor cable and the rock mass, reduces the corrosion of the anchor cable body, protects the anchor cable, and maintains the anchoring effect of the anchor cable , so that the supported rock stratum forms a whole and stable whole, with high support strength, which solves the support problem of large-section roadways or surrounding rock broken roadways near structures, and avoids the traditional bolt and anchor cables to obtain pre-tightening force by stretching , the safety problem that the anchor rod and anchor cable shoot out and hurt people when it fails.

Description

technical field [0001] The invention belongs to the technical field of roadway support, and in particular relates to a combined support method and system for grouting reinforcement after directional blasting at the end of a steel pipe anchor cable suitable for a coal mine roadway. Background technique [0002] At present: With the deepening of the mining depth of coal seams in my country, the problem of broken and weak surrounding rock in the roadway is becoming more and more prominent. In geological structural belts, stress concentration areas, and areas affected by dynamic pressure, anchor (net) cables and grouting have become important methods for strengthening and supporting broken and weak surrounding rocks. The anchor cables used in coal mines are prestressed steel strands with the outer end fixed on the surface of the surrounding rock of the roadway and the other end anchored in the deep stable rock mass, which can exert pressure on the structural surface and improve ...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing bolt and cable combined support methods have different depths of drill holes, and the layout scheme is complicated

[0006] (2) In the roadway with large deformation of soft rock or when facing the lateral displacement of the rock formation, the bolt and anchor cable are likely to pass through the rod body or the steel strand and shoot out from the hole at high speed, causing dangerous accidents

Images