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在大口径煤矿瓦斯抽排地面下井钻孔施工中,针对口径大、钻孔垂直度要求高和下管重量大等特点,确定施工工艺技术措施,完成了施工任务,质量指标达到合同要求。
In the underground borehole drilling of large-diameter gas drainage in coal mines, the technical measures of construction technology are determined and the construction tasks are completed. The quality indexes meet the contract requirements.