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我队在二道沟矿区勘探一大型金伯利岩体，投入了大量的钻探、坑探工程。由于设计不尽完善，施工中一钻孔于80米处垂直打穿坑道平巷边部。为了补救钻孔，我们设计加工了φ193/152mm阶梯肋骨扩孔钻具。将扩孔钻具送入坑道，与钻孔中钻杆相连接，开动钻机分别向上、下扩孔。其中向上扩孔600mm，向下扩孔300mm。将一根φ146mm套管（长240mn）两端各焊接两个可调螺杆之螺母，再分别套上压紧盘。送入坑道，先将套管上端插入平巷顶板新扩钻孔内，再把套管下端放进底板所扩钻孔中，调整好套管，将干海
Our team explored a large kimberlite rock in the Erdaogou Mining Area and invested a large amount of drilling and pit exploration projects. As the design is not perfect, a hole drilled in the construction at 80 meters vertical perforated tunnel edge. In order to remedy the drilling, we designed and processed φ193 / 152mm stepped rib reaming drill. Will be reaming drill into the tunnel, and drill pipe connected to the drilling, drilling rig were started up and down reaming. Which up reaming 600mm, downward reaming 300mm. Will be a φ146mm casing (length 240mn) at both ends of the two adjustable screw nut, and then set on the compression plate. Into the tunnel, the first casing inserted into the top of the new laneway roof hole, then put the bottom of the casing into the drill holes in the floor, adjust the casing, the dry sea