METHOD FOR MODIFICATION OF A PIPE COMPRISING INSERTION OF A REPLACEMENT PIPE INTO A HOST PIPE

摘要

The invention relates to a method for modifying a pipe, in which the host pipe (2) to be modified receives a replacement pipe (4) having smaller diameter together with a conduit or conduits (5) in order to form additional channels (8). In accordance with the invention, the flexible conduits (5) are disposed on top of the replacement pipe (4) and are pressurised so as to press the replacement pipe against the bottom of the host pipe (2) for mutual positioning of the conduits, the replacement pipe and the host pipe. After this, the free space remaining within the host pipe (2) is filled with liquid filler (7) while the pressurised conduits (5) prevent them and the replacement pipe from being dislodged, and finally the filler (7) is cured in order to lock the conduits and the replacement pipe into position. The invention is suitable e.g. for renewal of old drain pipes comprising insertion of a new drain pipe (4) to act as a replacement pipe within an old pipe (2) acting as the host pipe and providing additional channels (8) for service, rain or drying waters or cablings (9).