由某金矿委托我单位施工的主竖井工程勘察孔，设计深度717m。由于措施得当，施工顺利，仅54天就竣工，比合同要求的时间提前近两个月。终孔后，各项质量指标均通过了验收。其中钻孔倾角设计90°，实测了34个点，均为90°，抽样检查了3个点，也均为90°，达到设计中偏距控制在1.5％以内的要求，受到承包单位好评，取得了较好的经济效益。一、概 况施工钻孔为竖井掘进超前勘察孔。其目的是通过 A mine commissioned by a unit of mine construction of the main shaft engineering survey holes, the design depth of 717m. Due to proper measures, the construction was smooth and completed in only 54 days, nearly two months earlier than the contract required. After the final hole, all the quality indicators have passed the acceptance. Including drilling dip angle design 90 °, the measured 34 points, both 90 °, sampling check the three points are also 90 °, to achieve the design offset within 1.5% of the control requirements by the contractor units, Achieved good economic benefits. I. Overview Construction borehole shaft excavation advance survey hole. Its purpose is to pass