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某机施工地区岩层多为粘性页岩,用合金鑽头鑽进时,正常反应是給压漏水,不給压則不进尺。为此,採用了三刃鑽头(或称内外肋骨鑽头)取得了好的效果。該三刃式鑽头的构造如图所示。系用厚0.5公
Some machine construction area mostly sticky shale rock, drilling with alloy drill, the normal reaction is to leaking water pressure, do not pressure is not in the ruler. To this end, the use of a three-edged drill (or inside and outside the rib drill) achieved good results. The three-edge drill bit structure shown. Department of 0.5 thick