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越来越多的矿山采用了大直径炮孔。然而当孔径为100、125和150毫米时。因为普通钻杆对于这样大的孔径来说太小了,因此问题也随之而产生了。这些问题包括:怎样钻直孔(钻杆弯曲);向下打眼时怎样清除岩屑;怎样避免在软岩石中卡钎;怎样给钎头传递更大的能量;怎样向上打大孔。
More and more mines use large diameter boreholes. However when the apertures are 100, 125 and 150 mm. Since ordinary drill pipe is too small for such a large aperture, problems arise as a result. These questions include: how to drill straight holes (drill pipe bending); how to remove cuttings when drilling down; how to avoid sticking in soft rocks; how to transfer more energy to the bit;