Spalling prevention method through full-length anchoring of rib with soft bolt

Abstract

The invention discloses a spalling prevention method through full-length anchoring of a rib with a soft bolt. The spalling prevention method through the full-length anchoring of the rib with the soft bolt comprises the following steps in sequence: (1) utilizing a pneumatic column drilling machine to subject the inside of the coal wall to tiltingly drilling in the middle of a working face, drilling a hole between every two fully-mechanized coal mining supports, wherein the depth of the drill hole is 20-25m, the end of the drill hole is drilled to the inside of a coal seam roof to 1-2m; (2) after the drilling construction, utilizing a grouting pipe to bind a coir rope, utilizing the coir rope as the soft bolt and sending the coir rope to the end of the drill hole; (3) utilizing a pneumatic double-liquid chemical grouting pump to fill the drill hole with chemical pulp to perform full-length anchoring, and enabling the chemical pulp and the coir rope to solidify together to form a super-long bolt; (4) dismantling and moving away the pneumatic column drilling machine and the double-liquid chemical grouting pump; and (5) operating a coal mining machine to start to work to mine coal on a fully mechanized coal mining working face. The spalling prevention method through the full-length anchoring of the rib with the soft bolt has the advantages that the construction is simple, the rib spalling prevention effect is good, the cost is low, the quality of the coal is not affected and the like.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of coal wall spalling in fully mechanized mining working faces with large mining heights in coal mines. Background technique [0002] Fully mechanized mining technology has become an important way for safe and efficient mining of thick coal seams. However, with the increase of the thickness of the primary coal seam, due to the coal structure and mechanical properties of the working face, the coal wall is prone to slip damage, resulting in flaking, flaking The distance between the back end and the face increases, which in turn leads to a roof fall accident, which poses a huge threat to the underground operating environment and the safety of operators, affects the production progress, and increases the difficulty of roof management and safe production at the working face. Due to the prominent problem of coal wall spalling in fully mechanized mining faces, special coal wall reinforceme...

AI Technical Summary

Problems solved by technology

In China, there is also a method of drilling in the coal wall and injecting chemical slurry into the borehole to solidify the chemical slurry to form an ultra-long chemical slurry anchor to reinforce and prevent the coal wall. The elongation strength is small, and it cannot completely effectively prevent coal wall spalling. In addition, the price of chemical slurry is high and the dosage is large, which not only increases the cost of coal production, but also the chemical slurry material also has a certain impact on coal quality.

There is also a method of drilling in the coal wall and adopting metal anchor rods to reinforce and prevent coal wall slabs, but in the process of coal cutting by the shearer, sparks are likely to be generated when the shearer drum and the metal anchor rod are cut, which is harmful to the coal mine underground. Safety is affected, and it can only be applied in mines without gas

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