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过去我們鑽进抽水試驗孔或开口较大鑽孔时,因套管难起拔,化費了很多时間,影响了任务的完成。后采用了竹皮套管,起拨快而順利,10多米管子2、3个班就可起拔好,比过去提高效率5倍以上。竹皮套管就是外面包竹皮的套管。其所以利于起拨是因为:①竹皮套管下入孔内后使套管壁和孔壁不相接触,砂石、钻泥不能和管壁粘結在一起,因此能減少起拨时的摩擦阻力;②套管包竹皮后,在孔内处于潮湿的地方,由于氧化作用,管子生銹产生一种淡黄色或灰黑色胶状层,亦减少了摩擦。③起拨套管时,因向上拉力使套管向上移动,竹皮因和孔壁的粘土
In the past, when we drilled into a test hole or drilled a large hole, it was difficult for the casing to pull out and it took a lot of time to complete the task. After the use of bamboo sheathing, set off quickly and smoothly, more than 10 meters pipe 2,3 classes can be lifted up, more than 5 times more efficient than in the past. The bamboo sheath is the casing of the outer bamboo skin. The reason for this is that it facilitates dialing because: (1) After the bamboo sheath is inserted into the hole, the casing wall and the wall of the hole are not in contact with each other, and the sandstone and the drilling mud cannot be bonded together with the pipe wall. Friction resistance; 2 After the tube is wrapped in bamboo skin, it is in a wet place in the hole. Due to oxidation, the tube rusts to produce a light yellow or grayish black gel layer, which also reduces friction. When pulling the sleeve out, the upward pulling force causes the sleeve to move upwards, bamboo skin and hole wall clay