Retractable constant force yielding anchor bolt for dynamical pressure soft rock lane

Abstract

The invention relates to a retractable constant force yielding anchor bolt for a dynamical pressure soft rock lane. The retractable constant force yielding anchor bolt consists of an anchor bolt body, a tray, a pull rod, a pre-tightening adjusting bolt, a main spring, a pin roll, a knife-shaped cam, an auxiliary spring, an anchor head framework, a roller, a roller rack and a nut, wherein the anchor bolt body is in threaded connection with the pull rod; the tray can move along the pull rod under the action of an external force; and in the moving process, a synthetic pre-tightening force to the tray caused by the main spring and the auxiliary spring is basically kept unchanged, namely the constant force is kept. When surrounding rocks of the dynamical pressure soft rock lane are deformed, the tray moves through belt load and yield so as to release the stress. After the surrounding rocks relive the pressure, the tray moves back for strengthening and realizes secondary reinforcing for the surrounding rocks. When the surrounding rocks are repeatedly deformed due to stress disturbance, the anchor bolt can form 'yielding-supporting-yielding circular support and flexible support for the surrounding rocks, and thus the damage on the lane is avoided. The retractable constant force yielding anchor bolt disclosed by the invention is ingenious in design and compact in structure; the tray has long moving stroke; and except an anchor bolt body, other parts of the retractable constant force yielding anchor bolt can be detached for recycling, so that the cost is saved.

Description

Technical field: [0001] The invention relates to the field of support devices for underground engineering, in particular to a retractable and constant-force yielding bolt for a dynamic pressure soft rock roadway. Background technique: [0002] With the increase of coal mine mining depth, the problem of soft rock is becoming more and more serious, and the support problem of dynamic pressure soft rock roadway is becoming more and more prominent. The dynamic pressure soft rock roadway has three characteristics: first, the rock mass environment where the surrounding rock is located is complex, the rock mass is weak, broken, loose, and frequently affected by disturbance; second, the physical and mechanical properties of the surrounding rock are special, the rock strength is low, The weathering is serious and the rheology is large; the third is that the pressure of the roadway is strong and unstable. The pressure of the surrounding rock is fast at the beginning, and the deformatio...

AI Technical Summary

Problems solved by technology

However, the bolt system needs to be configured with a pressure sensor and a monitoring system, which makes the support increase too high

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