Pressure yielding internally-grouted anchor cable

Abstract

A pressure yielding internally-grouted anchor cable comprises a hollow internally-grouted cable body, an anchor cable tray, an anchor cable rigging and a pressure yielding pipe, the hollow internally-grouted cable body is formed by winding a plurality of steel strands around a hollow rubber grouting core pipe, a plurality of groups of grout outlet holes are drilled in the hollow rubber grouting core pipe at intervals, the plurality of steel strands at the position of every group of grout outlet hole are processed into a honeycomb-shaped grout outlet section, and the tail portion of the hollow internally-grouted cable body is provided with an anchoring agent mixing head; the pressure yielding pipe is a specially-made steel pipe with the middle portion protruding outwards to form an arc-shaped protrusion, the pressure yielding pipe is sleeved outside the hollow internally-grouted cable body in a penetrating mode and arranged between the anchor cable tray and the anchor cable rigging, and the yield load of the pressure yielding pipe is smaller that of the cable body steel strands. The pressure yielding internally-grouted anchor cable achieves the integration of deep grouting reinforcement and pressure yielding support coupling of surrounding rock of roadway, expands the diffusion range of the grout and enhances the reinforcement function and can yield pressure timely when under relatively large deformation pressure of the surrounding rocks to avoid being broken through pulling and to further avoid losing efficacy, and can effectively improve the stability of deformed surrounding rock of the roadway.

Description

technical field [0001] The invention relates to a yielding pressure internal grouting anchor cable, which is especially suitable for the anchoring and supporting technology of geotechnical engineering such as mine shafts and tunnels. Background technique [0002] With the increase of large-scale mining and mining depth, the problem of roadway support in deep high-stress extremely soft rock has become increasingly prominent. Due to the impact of high ground stress, weak bulging surrounding rock, mining impact and long-term continuous rheology of surrounding rock, the roadway's stress condition is seriously deteriorated, and the surrounding rock of the roadway inevitably shows the characteristics of large deformation. The roadway damage is very serious, and its support and maintenance problems have become a major bottleneck that seriously restricts the safe and efficient production of coal mines in my country. [0003] The research shows that for the complex and difficult-to-s...

AI Technical Summary

Problems solved by technology

Apparently, the construction process of the existing roadway support scheme is very complicated, and the support cost is very high

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