Abstract: A repair device for the in situ repair of a pipe comprises an assembly of at least four short cylindrical, inflatable members 1, 2, 3, 4, which are interconnected by articulated rods 5 which are each articulated by means of a cardan joint 6. When in the pipe, the inflatable members define a cavity 10 for receiving a filler material 7'. Ducts 8 are provided for individually connecting the inflatable members to a source of compressed inflating fluid, and a duct 22 is provided for conveying the filler material to the cavity 10. The outermost inflatable members are provided with attachments for securing a cable or chain 9 thereto. This construction permits the complete and continuous repair of the pipe during advancement of the assembly of inflatable members, even in the region of shoulders 12, internal projections 13, connections with lateral pipelines 14, or bends 12', while ensuring that the injection chamber 10 remains filled with filler material 7'.

Abstract: A device for the in situ repair of pipes (e.g. stormwater or sewerage) inaccessible from the inside, comprises a front module (1) and a rear module (2) each module being fitted with mobile arms (3, 5) and hydraulic displacement means (4, 6) connectable to an hydraulic pump at surface level. In their inoperative position, the arms (3, 5) form a diameter which is much smaller than that of the pipe (7) to be repaired. In their operative position, the arms (3, 5) form a diameter which is either similar to or slightly smaller than that of the pipe (7) to be repaired. The front module (1) thus, through the pressure exerted by the arms on the damaged inside walls of the pipe (7), acts both as a widener and as a guide, to restore the pipe (7) to its original diameter and to facilitate passage along the pipe of the rear module (2).