High-strength stable-resistance energy absorption anchor cable with function of applying pretightening force

Abstract

The invention discloses a high-strength stable-resistance energy absorption anchor cable with a function of applying pretightening force. A cable body sleeves an inner sleeve and an outer sleeve, a steel ball sleeve is mounted in a horn mouth of the outer sleeve by tightening an inner nut, the outer sleeve is connected with the inner sleeve through the extruding force action of a steel ball with the outer sleeve and the inner sleeve, and component force of contact force on the cable body in the axial direction is working resistance for resisting surrounding rock deformation. When surrounding rock generates axial deformation, a tray drives the outer sleeve to generate axial motion as well, the contact force of the steel ball to the inner sleeve and the outer sleeve increases continuously, plastic shear yield is firstly generated on the inner wall of the outer sleeve, after the steel ball moves to the tail end of the horn mouth of the outer sleeve, as the clearance distance keeps unchanged, so that the contact force keeps stable, stable plastic shear yield is generated on the inner wall of the outer sleeve, the working resistance keeps stable, and high-strength stable-resistance energy absorption support is realized. The pretightening force is applied by applying a torque to an outer nut, so that the torque acts on the tray, and the pretightening force is provided for the energyabsorption anchor cable.

Description

technical field [0001] The invention relates to the anchor cable support technology in roadway support, in particular to a high-strength stable resistance energy-absorbing anchor cable with the function of applying pretightening force. Background technique [0002] Conventional anchor cables are widely used in mining engineering roadway support, which are usually composed of multiple steel strands. Compared with bolt support, its support depth is larger and support resistance is stronger. However, with the large-scale mining of coal resources and the continuous optimization of mining technology, traditional anchor cables are often broken due to insufficient elongation in roadways with obvious dynamic pressure and severe deformation of surrounding rock. Therefore, on the premise of maintaining high working resistance, it is of great significance to increase the elongation of the anchor cable. In addition, from the perspective of energy, the anchor cable support can realize ...

AI Technical Summary

Problems solved by technology

However, the strength of this kind of frictional resistance is small; adding a pressure pipe between the pallet and the surrounding rock, the support length and support resistance are insufficient, so the "energy absorption" performance is slightly insufficient

In addition, the pretightening force plays an important role in enhancing the stability of the surrounding rock. However, in many yield anchor cable supports, there is no detailed report on how to apply the pretightening force

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