Pre-stress spiral rib hollow grouting anchor rope

Abstract

The invention discloses a pre-stress spiral rib hollow grouting anchor rope which comprises an anchor rope body which stretches into a rock-soil drilling hole; the anchor rope body is formed by weaving and twisting a plurality of high-strength spiral rib pres-stress steel wires; a rope tool is fixedly connected with the rear end of the anchor rope body; a grouting core tube penetrates through the anchor rope body and the anchor tool; a support disc is sleeved on the anchor tool; a locking nut is screwed on the anchor tool at the rear end of the support disc; the locking nut props against the rear end face of the support disc; and a slurry stopping plug which aligns with the rock-soil drilling hole is sleeved at the rear end of the anchor rope body. According to the grouting anchor rope, by increasing the grouting pressure, while being filled into the drilling hole so as to realize the overall-length anchoring, slurry spreads into the rock fractures around the drilling hole at the same time, so that the bonding and curing functions to the surrounding rock are achieved, and the deep hole anchoring grouting is realized.

Description

technical field [0001] The invention relates to special engineering fields such as soft rock roadways, gob-side roadways, deep roadways, large-section caverns, working face openings and roadway intersections, and in particular relates to prestressed spiral rib hollow grouting anchor cables. Background technique [0002] At present, resin anchor rods made of Φ15.24 and Φ17.8 steel strands are mainly used in China to reinforce coal roadways. Resin-anchored anchor cables have the advantages of simple manufacture, fast installation, and timely load bearing, and are quickly popularized and applied in large areas. However, in thick coal seam roadways with poor stability under dynamic pressure, such as gob-side excavation and some special places such as large-section cuts, broken areas, cross-mining roadways affected by dynamic pressure, etc., their bearing capacity is low. At the same time, due to The anchoring length is only one-third of the length of the anchor cable, which...

AI Technical Summary

Problems solved by technology

[0003] 1. Only single-strand anchor cables can be used for mixing resin anchorage, which has small bearing capacity, low support strength, and low drilling utilization rate

Since the cable body of the anchor cable has not undergone a special processing and manufacturing process, the 7 steel wires of the cable body cannot be simultaneously loaded. The actual load capacity of the cable body is only 220-230KN, which is lower than the engineering load of the steel strand, and even higher than the currently used Φ22mm The breaking force (250KN) of the high-strength anchor is still low

Broken anchor cables often occur in high-stress areas and roadways affected by rock burst, which brings great hidden dangers to the reliability of support

[0004] 2. As a supporting system for stirring resin anchoring, the diameter of the anchor cable body is too small, which does not conform to the reasonable "three-diameter" matching relationship. The thickness of the annular body formed after the resin anchoring agent is cured reaches 6 mm or more, which has a negative impact on the anchoring force

Reliability is conceivable, correspondingly, there will inevitably be serious safety hazards when using this kind of anchor cable as a reinforcement measure

[0006] 4. The anchor cable body is soft, and it is easy to bend under the thrust of the bolter during installation. Once it comes out, due to the high elasticity of the anchor cable body, it is easy to hurt people, and sometimes the installation fails due to the solidification of the resin.

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