| 摘要 |
PCT No. PCT/GB92/02287 Sec. 371 Date Jun. 23, 1994 Sec. 102(e) Date Jun. 23, 1994 PCT Filed Dec. 10, 1992 PCT Pub. No. WO93/13350 PCT Pub. Date Aug. 5, 1993The invention provides that where a main underground pipeline or passageway (10) is lined by a lining tube which extends over the connection of a lateral pipe (12) with the main pipeline or passageway (10), the lateral connection can be readily located and the lining tube (44) cut to re-establish the connection, if such as a steel ball or other deposit, which is radiation detectable, is placed on the surface of the pipeline or passageway (10) at a predetermined distance (77) from the said lateral connection. |
