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大直径矿井采用钻井法施工时,通常采用分级扩孔的施工方法。大直径扩孔钻头设计的合理与否是影响钻井效率的主要因素。结合工程实践,对扩孔钻头总成及破岩刀具、刀盘形式、吸渣口和溢流孔的布置等进行了分析和总结,提出了设计和使用原则。
Large-diameter mine construction method using drilling, grading reaming method is usually used. Whether the design of large-diameter reaming bit is reasonable or not is the main factor that affects drilling efficiency. Combined with the engineering practice, the reaming bit assembly and broken rock cutter, the form of the cutter head, the slag hole and the layout of the overflow hole were analyzed and summarized, and the principles of design and use were put forward.