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(二)钻头式挖槽机(泥浆循环排碴) 这类机械是利用各种钻头对地层进行破碎,借助泥浆循环将土碴排出槽外。这类机械依钻头对地层的破坏方式可分为:回转钻、冲击钻、回转冲击钻、凿刨钻、滚刀钻和水平螺旋钻;依钻头的数量可分为:独头钻和多头钻;依泥浆循环方式可分为:正循环和反循环。泥浆通过钻杆经由钻头进入槽内,携带土碴一同上升至槽顶溢出,称正循环(图41,a);泥浆经由导沟流入槽内,携带土碴一起被吸入钻头经过
(b) Drilling machine (mud circulation) This type of machine uses a variety of drill bits to crush the ground and drains the soil out of the tank by means of mud circulation. The type of failure of this type of machinery according to the drill bit to the formation can be divided into: rotary drilling, impact drilling, rotary impact drilling, gouging drill, hob drill and horizontal auger; according to the number of drill bits can be divided into: single head drill and multi head drill According to mud circulation can be divided into: positive cycle and reverse cycle. The mud enters the tank through the drill pipe via the drill bit, and the carrying soil swells up to the top of the tank and is called positive circulation (Fig. 41, a); the mud flows into the tank through the guide channel and is carried along with the soil and is sucked into the drill bit.