A New Composite Grouting Anchor Applicable to Roadway Floor

Abstract

The present invention proposes a novel composite grouting bolt suitable for the roadway floor, including an inner tube, an outer tube, a retaining tube and a connecting plate. The first end of the inner tube is assembled and connected to the first end of the outer tube through the retaining tube. A backflow hole is opened on the baffle pipe, the connecting plate is fixedly connected with the second end of the outer casing, the second end of the inner pipe is assembled and connected with the connecting plate, and a baffle is fixedly connected on the outer surface of the inner pipe close to the first end of the inner pipe. A guide hole is opened at the second end of the inner tube, an end hole is opened at the first end of the outer tube, and a grouting hole is opened between the end hole on the outer tube and the second end of the outer tube, The grouting hole and the end hole are respectively located on both sides of the blocking plate along the axial direction of the outer casing. The beneficial effects of the present invention are as follows: by improving the structural layout of the grouting anchor, the supporting function of the grouting anchor itself is improved; the grouting process is optimized to prevent the grout from being solidified before the borehole is filled; Grouting completed state.

Description

technical field [0001] The invention relates to the technical field of anchoring and support for mining engineering, in particular to a novel composite grouting anchor rod suitable for roadway bottom plates. Background technique [0002] At present, hollow grouting bolts are commonly used in the floor of high-stress soft rock roadways for grouting and support. Grouting the cavity inside the hollow grouting bolts can achieve the purpose of grouting, but it reduces the cost of hollow grouting. The supporting function of the slurry bolt itself. The reason is that there are grouting holes on the hollow grouting anchor, and stress concentration tends to occur around the grouting hole, which reduces the bearing capacity of the hollow grouting anchor. When the hollow grouting anchor is placed in the roadway under tension Deformation, easy to be broken at the position of the grouting hole. In addition, after the existing hollow grouting bolt is grouted into the borehole, the grout...

AI Technical Summary

Problems solved by technology

The reason is that there are grouting holes on the hollow grouting anchor, and stress concentration tends to occur around the grouting hole, which reduces the bearing capacity of the hollow grouting anchor. When the hollow grouting anchor is placed in the roadway under tension Deformation, easy to be broken at the position of the grouting hole

In addition, after the existing hollow grouting bolt is grouted into the borehole, the grout will solidify quickly, and the completion status of the grouting cannot be determined

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