Tension-compression coupled yielding energy-absorbing grouting anchor rod for large deformation of surrounding rock and working method thereof

Abstract

The invention discloses a tension-compression coupled yielding energy-absorbing grouting anchor rod for large deformation of a surrounding rock and a working method thereof. The tension-compression coupled yielding energy-absorbing grouting anchor rod comprise a hollow grouting anchor rod, an anchor rod locking device, a plurality of yielding grouting devices and an energy-absorbing anchor head, wherein a protection sleeve is arranged on a rod body of the hollow grouting anchor rod, a plurality of first grouting holes are formed in the rod body, and the first grouting holes penetrate through the protection sleeve and are communicated with a drilling hole; the multiple yielding grouting devices sleeve the rod body of the hollow grouting anchor rod at intervals, the surfaces of the yieldinggrouting devices are provided with second grouting holes, the energy-absorbing anchor head is fixed to the end of the hollow grouting anchor rod, and the anchor rod locking device is arranged at the free end of the hollow grouting anchor rod. By means of the yielding grouting devices, the real-time reinforcement support at the initial stage of deformation of the surrounding rock is achieved, the step-by-step automatic yielding effect is also played, the large supporting resistance is provided for the anchor rod body through the energy-absorbing anchor head, and the technical problems of anchorrod failure and insufficient grouting caused by high stress and large deformation of the surrounding rock are solved.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering support, and in particular relates to a tension-compression coupled pressure-absorbing energy-absorbing grouting bolt used in the case of large deformation of deep surrounding rocks and a working method thereof. Background technique [0002] The grouting bolt support technology is a combination of bolt and grouting technology, which makes the anchored surrounding rock cemented into a whole, thereby improving the internal loose structure of the surrounding rock, improving the strength and bearing capacity of the surrounding rock, and has been widely used at present. field of geotechnical engineering. In the prior art, grouted anchors are classified into tension-type grouted anchors and pressure-type grouted anchors according to the force characteristics of the anchors. Among them, the tension type grouting bolt uses the cohesion between the bolt body and the grouting slurry to provide the c...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention provides a tension-compression coupling pressure-absorbing energy-absorbing grouting bolt and working method for large deformation of surrounding rock, which is used to solve the failure of the bolt caused by high stress and large deformation of surrounding rock , The problem of insufficient grouting

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