A large-deformation anchor rod and anchoring method for anti-unanchoring

Abstract

The invention discloses an anti-slip large deformation anchor rod. The anti-slip large deformation anchor rod comprises an expansion anchoring head and a driving mechanism for driving expansion of theexpansion anchoring head. The driving mechanism comprises an anchor bolt body, pull rods, first support rods and second support rods; the expansion anchoring head is arranged outside the front end ofthe anchor bolt rod in a sleeving mode; the pull rods are disposed in the anchor bolt body and the two ends of the pull rods penetrate out from the anchor bolt body; the first support rods are connected between the expansion anchor head and the anchor bolt body in a hinged mode; the second support rods are connected between the expansion anchor head and the front ends of the pull rods in a hingedmode; and a tray and a first locking nut are arranged at the tail end of the anchor bolt body, and a second locking nut is arranged at the tail end of the pull rod. According to the anti-slip large deformation anchor rod, the expansion anchor head is driven by the anchor bolt body and the pull rod to be pressed and anchored, and the rotation of the first support rod and the second support rod realizes the anchor end yield while the extrusion force of the anchoring end is increased in the deformation process of the surrounding rock; within a certain range, the larger the deformation of the surrounding rock, the higher the anchoring force of the expansion anchoring head; and the anchoring is more stable, and the utilization of mine pressure is realized.

Description

technical field [0001] The invention belongs to the technical field of rock mass anchoring, and in particular relates to an anti-unanchoring large deformation anchor rod and an anchoring method. Background technique [0002] Going deep into the earth has become the consensus of scientists around the world. As the key support for underground space engineering support, the importance of bolts becomes more prominent as the depth of rock engineering increases. Deep rock engineering is in the environment of "three highs and one disturbance". Under the condition of high stress and frequent mining disturbances, accidents of anchor removal or broken anchor often occur, resulting in the collapse of roadways and tunnels without warning, and bolt flying, etc. , leading to a large number of personnel and property losses, with the increase of engineering depth, these accidents show an increasing trend, which restricts the development of deep rock engineering. The strength and integrity ...

AI Technical Summary

Problems solved by technology

However, at present, the bolt is realized through the deformation of the main body of the bolt, so that the strength of the bolt body gradually decreases, which is not conducive to the stability of the surrounding rock.

At the same time, during the deformation process of the anchor rod, the strength of the anchor end gradually decreases during the stress adjustment process, which leads to the phenomenon of anchor bolt breaking

In addition, although grouting anchors have been used, the phenomenon of plugging and insufficient grouting often occurs during the grouting process of anchors.

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