Tension-compression coupled pressure-absorbing energy-absorbing grouting bolt for large deformation of surrounding rock and its working method

Abstract

The invention discloses a tension-compression coupling yield-pressure-absorbing energy-absorbing grouting bolt for large deformation of surrounding rock and a working method, which comprises a hollow grouting bolt, a bolt locking device, a plurality of yielding-pressure grouting devices and The energy-absorbing anchor head, the hollow grouting anchor rod body is provided with a protective sleeve, the rod body is provided with a number of first grouting holes, and the first grouting holes penetrate the protective sleeve and communicate with the drill hole. Two pressure-releasing grouting devices are sleeved on the rod body of the hollow grouting anchor rod at intervals, and the surface of the pressure-releasing grouting device is provided with a second grouting hole, and the energy-absorbing anchor head is fixed on the end of the hollow grouting anchor rod. The anchor rod locking device is arranged at the free end of the hollow grouting anchor rod. The present invention not only realizes the real-time reinforcement and support of the initial stage of surrounding rock deformation through the yielding pressure grouting device, but also plays the role of step-by-step automatic yielding, and provides greater support resistance for the bolt body through the energy-absorbing anchor head , Solving the technical problems of bolt failure and insufficient grouting caused by high stress and large deformation of surrounding rock.

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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