A device used in conjunction with a puller when testing the anchorage force of an underground bolt in a coal mine

Abstract

A device used in conjunction with a puller when testing the anchorage force of an underground bolt in a coal mine. There are four adjusting bolts (3) symmetrically distributed, the lower ends of the adjusting bolts are provided with buffer rubber pads (4), the two sides of the pressure plate in the length direction are provided with arc-shaped raised parts (7), and there are supplying parts in the raised parts. The auxiliary rod mounting hole (5) through which the auxiliary rod passes, and the auxiliary rod fixing bolt (6) is arranged above the auxiliary rod mounting hole. When testing the anchoring force of the underground bolt, if the coal wall is uneven, the coal wall is greatly damaged, or the anchor net is obstructed, the device can be used to make the bolt and the pressure plate form a vertical state, so as to ensure that the bolt can be fixed with a puller. During the anchoring force test, the puller can pull the anchor rod vertically outward, and the force on the anchor rod is balanced, which does not affect the accuracy of the anchoring force test.

Description

technical field [0001] The invention relates to underground support in coal mines, in particular to a device used in conjunction with a puller when testing the anchoring force of an underground bolt in a coal mine. Background technique [0002] Bolt support is a commonly used roadway reinforcement and support method in coal mines. The rod column is made of metal parts or other materials, and it is driven into the pre-drilled hole in the rock mass around the chamber. The structure and the tail supporting plate (or not), or rely on the bonding effect to combine the surrounding rock and the stable rock mass to produce suspension effects, composite beam effects and reinforcement effects, so as to achieve the purpose of support. It has the advantages of low cost, good support effect, simple operation, flexible use and less construction clearance. The anchoring force is the bonding force between the anchoring part of the bolt and the rock mass, and is the most important performan...

AI Technical Summary

Problems solved by technology

[0003] When testing the anchorage force of bolts in coal mines, it is often encountered that the coal wall is uneven, the coal wall is greatly damaged, and the anchor net is obstructed. At this time, it cannot be guaranteed that the puller will pull the bolt vertically outward, resulting The unbalanced force affects the accuracy of the anchorage force test

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