Chain link fence support, no accident in coal mine

To avoid the phenomenon of flowing coal in the process of uncovering coal and piercing coal, the innovative application of the full bolt-net support technology for uncovering coal through coal has realized safe uncovering of coal and coal through coal without accidents.

It is understood that the 14276 transportation crosscut of the mine is located at the -600 level, and the surrounding rock pressure of the roadway is high. U-steel support is used for traditional uncovering and piercing coal. The support strength is low, and coal accidents are prone to occur during the process of uncovering coal and piercing coal. For this reason, the mine adopts advanced pre-grouting and full bolt-mesh support to uncover and penetrate the coal technology, stop at a distance of 2 meters from the normal line of the coal seam, and carry out long holes in the coal body in the uncovered and coal-cross section in advance. Pre-grouting, using "channel steel + anchor mesh and shotcrete support" to uncover and penetrate coal.

Using this process, the advance grouting of the coal in the coal uncovering and coal crossing section can ensure that the coal body is cemented as a whole during the coal uncovering and coal crossing process, preventing the roof flowing coal from causing gas accidents and roof accidents, and improving the effect of roadway forming. Effectively improve the strength of roadway support in uncovering and crossing coal sections.