Energy absorption anchor rod tray

Abstract

The invention discloses an energy absorption anchor rod tray which comprises a double-layer disk-type tray body capable of moving along an anchor rod and a pre-tightening nut which is in threaded connection to the exposed end of the anchor rod, wherein a hollow disk-type guide slot is formed between an upper-layer disk-type tray and a lower-layer disk-type tray of the double-layer disk-type tray body through an interlayer gasket; an energy absorption pipe sleeving the anchor rod is arranged between the pre-tightening nut and the double-layer disk-type tray body and consists of a tear energy absorption section and a tear pre-tightening section; the lower part of the tear pre-tightening section penetrates through a central hole of the upper-layer disk-type tray and then presses an energy absorption pipe alignment table around a central hole of the lower-layer disk-type tray through a chamfer; pre-cracked line slots are formed in the chamfer in a spacing manner; cracking supporting knives corresponding to the pre-cracked line slots are arranged at the outer edge of the energy absorption pipe alignment table. Under an impact load, the energy absorption tray can realize continuous and stable yielding energy absorption through shaft cracking yielding of the energy absorption pipe; when matched with the high-strength anchor rod, the energy absorption tray can effectively support and protect surrounding rock with high impact trend.

Description

technical field [0001] The invention relates to the safety support technology of underground engineering such as mines and tunnels, in particular to a bolt tray with the function of letting pressure and absorbing energy used in the bolt support of underground tunnels. Background technique [0002] In the bolt support of underground roadway, the bolt tray is an important part of the bolt support system. Its function is, on the one hand, apply prestress to the bolt by pressing the tray, and make the prestress diffuse into the coal and rock mass around the bolt, so as to realize the active and timely support of the bolt; on the other hand, the deformation of the surrounding rock makes the load Acting on the tray, the load is transmitted to the anchor body through the tray, and the changing load of the anchor diffuses into the surrounding rock through the tray, thereby improving the stress state of the surrounding rock and controlling the deformation and failure of the surroundi...

AI Technical Summary

Problems solved by technology

The Chinese patent with the application number 201010515672 discloses a continuous progressive pressure anchor tray, which is squeezed out of the disc-shaped tray body with multiple ring-shaped pressure grooves and the surrounding rock wall, so that although it has Certain pressure-yielding characteristics, but the resistance during the pressure-yielding process is unstable, and it is easy to cause extrusion scratch damage to the surrounding rock, loosen the surrounding rock, and cause the bolt to fail; and the pallet cannot be reused; the groove processing is difficult

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