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在大型水电工程建设中,为了查明岩石基础强度及抗滑稳定性等问题,有时必须进行少量的1米大口径岩心钻探工程。但由于我院目前尚缺乏这种大口径钻探成套设备,在澜沧江流域的大型水电勘探工作中,利用SPJ-300型水文水井钻机改装超径运转,在岩石可钻性为7～8级的英安岩中进行了1米大口径的岩心钻探,已完成西个钻孔,其中401号钻孔,从开钻到竣工共用85天,每天开两个班,纯钻时间263小时,辅助时间530小时,机械事故74
In the construction of large hydropower projects, in order to identify the basic strength of the rock and anti-skid stability and other issues, and sometimes must carry out a small amount of 1 meter large diameter core drilling project. However, due to the lack of such a large-diameter drilling equipment in our hospital, during the large-scale hydroelectric prospecting in the Lancang River basin, the SPJ-300 hydro-water well drilling rig was used to modify the overrun operation. In the case of rocks with drillability of 7 to 8 A rock in the 1 meter large diameter core drilling, has completed the West Drilling, of which hole No. 401, from drilling to completion of shared 85 days, two classes a day, pure drilling time of 263 hours, auxiliary time 530 Hours, mechanical accidents 74