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矿井抽放瓦斯工作中,钻孔封堵是不可缺少的重要环节,封堵质量的好坏直接影响到抽放效果。目前我国一般仍采取人工封堵,此法在封堵致密岩层中的浅孔时尚可保证质量,而在封堵裂隙发育、负压较大的破碎岩层或煤层中的钻孔时,必须加大堵孔深度(一般为5～10米)才能保证质量。堵孔越深,插入孔内的钢管越长,从而相应地增加了劳动强度和材料消耗。为了解决这些问题,我们对水泥砂浆封孔法的工艺、器具进行改进,研制试用了脱管压气封孔法。这种方法可以大大降低钢材消耗,减轻劳动强度,提高封孔工效。
Mine drainage gas work, borehole sealing is an indispensable part of the quality of plugging a direct impact on the drainage effect. At present, China still generally adopts artificial sealing. This method can ensure the quality of shallow holes in tight rock strata, and must be enlarged when blocking fissures and holes with large negative pressure in the rock or coal seam Blocking the depth of the hole (usually 5 to 10 meters) to ensure quality. The deeper the plugging hole, the longer the steel tube inserted into the hole, thereby correspondingly increasing labor intensity and material consumption. In order to solve these problems, we improved the technology and equipment of sealing method of cement mortar, and developed a new type of pipe sealing method. This method can greatly reduce the consumption of steel, reduce labor intensity and improve sealing efficiency.