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因施工不当而造成钻孔弯曲或打丢矿层需要纠斜或补取矿心时,或者因地质设计的需要而打定向钻孔时,都必须在原孔内进行定向弯曲工作。目前一般多系采用下偏心楔的方法解决,即将偏心楔下入原孔的适当地段,然后用小一级的钻具沿偏心楔斜面所预定的方向,钻出新孔。其中比较困难的就是偏心楔的定向工作,现介绍永仁队试验成功的“打印法”进行钻孔偏斜定向的经验。
Due to improper construction caused by drilling bent or throwing the seam need to correct or re-fill mining center, or due to geological design needs to be directed to drilling, must be in the original hole directional bending work. At present, the general method of using a lower eccentric wedge, the eccentric wedge is about to enter the appropriate section of the original hole, and then use a small drill along the eccentric wedge bevel direction predetermined drill new hole. One of the more difficult is the work of the eccentric wedge orientation, are introduced Yongren successful test “print” drilling deviation orientation experience.