Hole wall grouting anchor cable

Abstract

The invention discloses a hole wall grouting anchor cable which is characterized in that an L-shaped grouting hole is formed in an anchor cable supporting plate and on the periphery of a steel strand mounting hole, wherein one end of the grouting hole is communicated with an anchor cable hole in the anchor cable supporting plate and is communicated with an annular grouting cavity between a steel strand and a hole drilling wall through the anchor cable hole, and the other end of the grouting hole is located on the surface of the anchor cable supporting plate and is connected with an external grouting pipe; a hole pipe located in a drilled hole is connected with the anchor cable supporting plate; and a groove is turned on the periphery of the hole pipe and is internally provided with a hole wall sealing ring. The hole wall grouting anchor cable disclosed by the invention can effectively improve the grout anchoring strength of an anchor cable and reduces the manufacturing cost of the anchor cable.

Description

technical field [0001] The invention relates to an anchor cable, which is applied to the supporting of coal mine shafts. Background technique [0002] Coal mine roadway support anchor cable is composed of steel strand, resin anchoring agent anchoring section, steel strand free section, orifice backing plate and anchorage. The steel strand is anchored deep in the surrounding rock of the roadway through the resin anchoring agent. Anchor cable supporting plate and tension gauge etc. apply pre-tightening force to the anchor cable. The anchor cable transfers the surrounding rock pressure of the roadway to the depth of the surrounding rock through the steel strand to support the roadway. [0003] At present, most of the anchor cables used in my country's coal mines are small-aperture resin-anchored prestressed anchor cables. This anchor cable anchoring technology has the following problems, which directly affect or reduce the anchoring performance and support performance of the ...

AI Technical Summary

Problems solved by technology

This anchor cable anchoring technology has the following problems, which directly affect or reduce the anchoring performance and support performance of the anchor cable:

[0004] 1. The anchoring depth of the anchor cable is limited by the installation process, because the torque provided by the anchor cable installation tool cannot support the steel strand to stir deeper anchoring agent;

[0005] 2. The possible anchoring length of the anchor cable = the depth of the anchor cable hole + the height of the roadway - the length of the steel strand - the height of the drilling rig, and the length of the steel strand and the height of the drilling rig are fixed. Therefore, the anchoring length of the anchor cable is limited by the height of the roadway. It is difficult to further improve the anchoring force of the anchor cable;

[0006] 3. The packaging bag of the anchoring agent is difficult to smash completely, and its flaky film separates the bonding between the anchoring agent and the steel strand or the hole wall, reducing the anchoring strength of the anchor cable;

[0007] 4. In the process of pushing the anchoring agent, the anchoring agent may collapse, pass through, or fail to reach the anchoring position, etc., causing some anchoring agents to lose anchor, and the anchoring performance or anchoring force of the anchor cable is uncertain.

[0010] 1. The breaking force of the anchor cable rod is low, and the anchor cable rod body with high-strength spiral rib prestressed steel wire braided outside the central steel pipe is used, which seriously reduces the breaking force of the anchor cable;

[0011] 2. The anchor cable rod body is composed of two or more materials, and its materials have not been treated with internal stress relief and shape stabilization, which seriously weakens the mechanical properties and anchoring performance of the coal mine support anchor cable;

[0012] 3. The grouting pipeline is long and thin, and it is easy to be blocked during grouting, which may cause the failure of grouting anchorage;

[0013] 4. The production cost of hollow grouting anchor cable is relatively high

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