Large obliquity thick coal seam small coal pillar goaf-along lane driving side support device

Abstract

The invention discloses a supporting and protecting device of a large obliquity thick coal bed leaving small coal pole along the roadway driving, which comprises an outrigger, a triangle fixing bracket, a supporting leg brace and a fixing anchor. The outrigger is I-shaped, and a triangle fixing bracket is welded on the top and the bottom ends of the outrigger. The fixing anchors of the top and the bottom ends of the outrigger pass the anchor hole on the triangle fixing bracket. One section of anchor enters the roadway top and the stable terrane of the soleplate, and the other end is hung with a splint which fixes the top and the bottom ends of the outrigger on the roadway coal wall to form a strong supporting and protecting whole together with the metal net, the high-strength pre-stress anchor and the metal band. The materials of the device can be easily gained, the construction is easy, and the supporting and protecting are safe and reliable, thus effectively improving the reliability and safety of the whole support and protection, solving the roadway supporting and protecting technological problem of large obliquity thick coal bed, producing good effect that prevents the coal bed from sliding, and providing high practical value.

Description

technical field [0001] The invention relates to an upper side support device for an upper air return roadway with small coal pillars left along the goaf in a thick coal seam with a large inclination angle, in particular to an upper air return for the gob-side excavation with a small coal pillar left in a thick coal seam with a large inclination angle The support in the coal side support on the side of the small coal pillar in the roadway, it is combined with the metal mesh, the high-strength prestressed anchor rod and the steel belt to form a support structure. Background technique [0002] When leaving a small coal pillar in the thick coal seam with a large dip angle to excavate the upper air return roadway along the goaf, the upper side and the floor of the roadway are generally in the coal seam. Affected by the mining during the advance of the working face in the previous stage and the long-term immersion of the old pond water in the goaf, the coal body of the small coal ...

AI Technical Summary

Problems solved by technology

When shed support is used, the shed foot is unstable, and it is difficult to prevent the small coal pillars on the roadway from sliding down, and it is easy to produce large deformation under the pressure of the roof, and it is difficult to control the stability of the roadway

Although the combined support of the anchor mesh belt can improve the integrity and stress state of the coal walls of the two sides of the roadway to a certain extent, and enhance the self-bearing capacity of the coal body, it is still difficult to prevent the overall pumping and sliding of the small coal pillars on the side of the roadway. , it is necessary to find a more ideal new support method to effectively solve the support problem of the upper side of the roadway in the thick coal seam with a large dip angle

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