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我队使用大口径水文钻机钻凿水井、配用φ114毫米的大直径钻杆.一般情况下,一根新钻杆钻几个300米的水文孔后,丝扣部分即磨损或出现裂纹不能使用修复这种钻杆,需墩厚两端,重车丝扣.一根9米长的这种钻杆,价值约340多元,只有鞍钢无缝钢管厂生产修复这种管子,目前尚未找到合适的加工厂.为此,我队与北京水工机械厂协作,于1983年8月加工出一台墩
Our team used large-caliber hydrologic drilling rigs to drill wells with a large diameter drill pipe of φ114mm. Generally, a new drill pipe drills a few 300-meter hydrograph holes, and the threaded portion is worn or cracked and can not be used Repair of such drill pipe, pier thickness required at both ends, heavy car thread buckle.A 9-meter-long drill pipe of this value of about 340 yuan, only the Angang seamless steel pipe plant to repair the pipe, has not yet found a suitable Processing plant.To this end, my team and Beijing Hydraulic Machinery Factory collaboration, in August 1983 to process a pier