Underground pipe conduit fitting procedure uses liner inserted at same time and auxiliary unit to hold conduit(s) in place

摘要

The procedure, in which a liner (6) is inserted in an underground pipe (4) at the same time as one or more conduits (10) to receive cables, uses an auxiliary unit (40) to hold the conduit(s) in place temporarily against the inner surface (14) of the pipe. The sleeve is then applied against the supported conduits, using a pressure fluid injected inside it, the auxiliary unit is removed, and the sleeve section is made rigid. The procedure is then repeated until the rest of the pipe has been lined with the conduit(s) in place.