| 摘要 |
When inserting a tube into a borehole in the ground for extracting minerals, tube parts are successively added to the proximal end of the tube while the tube reaches into the borehole. Thereafter, the tube is inserted further into the borehole. As the addition of the tube part is carried out by welding, each time an eminently sealing and slender joint between the tube parts is obtained. As the tube parts are successively added to the tube only when this is necessary for inserting the tube further into the ground, winding up the tube to store it prior to insertion is not necessary and the use of a tube-carrying reel which is difficult to handle is thus rendered redundant. Further, an installation for carrying out the proposed method is described. |
