| 摘要 |
PCT No. PCT/SE93/00158 Sec. 371 Date Nov. 28, 1994 Sec. 102(e) Date Nov. 28, 1994 PCT Filed Feb. 25, 1993 PCT Pub. No. WO93/17215 PCT Pub. Date Sep. 2, 1993When drilling in soil and simultaneous loading of casing tube, it is desirable to be able to use casing tubes of plastic material such as PEH-plastic. This is made possible by a special design of a casing shoe giving a strong joint between the casing shoe and the casing tube. The casing shoe is made of metal and has a part which is perforated with holes filled with the plastic material. Tube couplings between the casing tubes can also be joined to the tubes in the same way as the casing shoe. In other words, they can be made of metal and each have one part perforated with holes filled with the plastic material. |
