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在岩性为石英闪长岩并夹有伟晶花岗岩的坚硬岩层进行钻探时,由于一次投砂法工效低,因此,从1958年以来,我们便采用了孔口投砂法,几年来的实践证明,效果较好。孔口投砂,是在不停钻,不停供水的情况下,由孔口投入铁砂的一种方法。具体作法是在下钻前,先投入铁砂10公斤左右,当钻进约0.6米左右时(可根据岩层硬度和耗砂量而定,即在钻进速度达到最高后而开始减慢时),就立刻补投铁砂,以后每隔20～30分钟补砂一次,每次铁砂用量约为2～3公斤,应慢慢均匀地投入。在正常钻进中,
In the drilling of hard rock with lithology of quartz diorite and pegmatite granite, because of the low efficiency of one shot blasting method, since 1958, we have adopted the method of orifice sand casting, which has been practiced for a few years Prove that the effect is better. Hole sand, is a non-stop drilling, non-stop water supply, the iron ore from the hole into a method. The specific practice is to invest about 10 kilos of iron ore before drilling, and when drilling about 0.6 meters (depending on rock hardness and sand consumption, that is, when the drilling speed reaches its maximum and begins to slow down), Cast iron sand immediately, after every 20 to 30 minutes to fill the sand once each iron ore dosage is about 2 to 3 kg, should be slowly and evenly into. In normal drilling,