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去年12月份我队八号钻机在峰峰煤矿一坑，打了一个大口径钻孔，口径246毫米。深190.40米供坑下掘进开采巷道排水之用。虽然每年我队打了不少疏干孔，排水孔和机井，在冲积层或基岩中打大口径钻孔有些经验，但是竣工后下219毫米套管到246毫米钻孔内，在孔内有水的情况下注灰浆充填井壁与套管之间隙，使其连成一体，对我队来说还是一个新的课题。根据以往经验，孔内没水，或
In December last year, my team on the 8th drilling rig in Feng Mine a pit, hit a large diameter bore, caliber 246 mm. 190.40 meters deep for excavation mining tunnel drainage purposes. Although I have played a lot of holes, drains and wells each year, I have had some experience drilling large bore holes in alluvium or bedrock. However, when completed, the next 219 mm casing was drilled to a depth of 246 mm. In the case of water injection grout filling the gap between the shaft wall and the casing, so that even the integration of the team is still a new issue. According to past experience, no water hole, or