论文部分内容阅读
在钻探施工过程中，经常遇到下列情况：矿心采取率低，需要中途补采矿心；冲洗液漏失，漏失部位距离孔底较高，需要中途堵漏；钻孔弯曲度达不到设计要求，需要中途进行纠斜或偏斜；要求分层封闭目的层等等。由于在离开孔底的部位，因此需要“架桥”，以便在预定位置进行工作。关于“架桥”方法，各地有很多成功经验，如钢丝、簧片倒刺塞，竹片架桥法，木塞挤夹法等。但是往往由于孔内情况的差异，或在操作上造成麻烦，或“桥”架得不牢靠，而导致施工
In the drilling process, the following situations are often encountered: The mining rate is low and the mining center needs to be repaired midway; the leakage of the washing liquid is lost and the missing part is higher from the bottom of the hole and needs to be plugged halfway; the bending of the drilling is less than the design requirement , Need to be corrected midway skew or skew; requirements stratified target layer and so on. Due to the part of the hole from the bottom, there is a need for “bridging” in order to work in a predetermined position. On the “bridging” approach, there are many successful experiences around, such as steel wire, reed stopper, bamboo bridge method, pinch clamp method. However, construction often takes place due to differences in the conditions of the holes or operational troubles or the “bridge”