excentric overburden drilling tool (odex)

Product Description

Eccentric Reamer System Step-by-step 1、When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly. 2、When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in, allowing the drill bit assembly to be pulled up through the casing. 3、Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent. 4、Drilling continues to the desired depth in the bedrock using a conventional drill string . 偏心钻具工作原理 1、凿岩工作开始时，偏心扩孔套沿中心导向钻头旋出，同时开始扩孔以保证套管和钻进系统同时前进。 2、跟管钻进到位后，小心地反转，偏心扩孔套旋回，并将偏心钻具系统从套管中拔出。 3、将套管向上拔，同时在孔底喷灌砼浆或其它填充物。 4、在基岩中采用常规钻具钻进以达到所需深度。