Construction method of directional hole in upward penetration layer on top plate for gas drainage in underground coal mine
A gas drainage and construction method technology, which is applied in the direction of gas discharge, directional drilling, mining equipment, etc., can solve the problems of short extension distance of fracture zone, long construction period, low drilling efficiency, etc. The effect of large hole coverage area and high drilling efficiency
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[0033] The implementation of the present invention will be described in detail below through examples and in conjunction with the accompanying drawings. in,
[0034] Example:
[0035] see figure 1 , figure 2 , a method for constructing directional holes in the upward penetration layer on the roof of coal mine underground mining gas drainage, characterized in that it includes the following steps:
[0036] Step 1: Drill site 4 preparation. A plurality of drilling sites 4 have been developed in the wind tunnel 2 of the adjacent working face of the working face 1 to be mined in the underground, and the distance between the adjacent drilling sites 4 is equal to the horizontal projection length of the directional hole 5 of the directional stabilizing hole section c of the upward penetration layer on the top plate .
[0037] Step 2: Drill hole design. According to the mine coal seam roof occurrence and mining plan, the existing model simulation analysis and theoretical formula...
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