Abstract: A relining pipe for insertion inside sewer lines to repair them. The relining pipe is made up of a number of substantially rigid pipe elements (1), which are interconnected by pipe couplings, the pipe coupling including a female sleeve part (2) and a male locking part (3), at least one of these having a circumferential shoulder surface and the other having a stop surface pressing against the shoulder surface when the pipe elements are pressed against each other, and in the female part and the male part counterparts (5, 16) which snap-lock to each other in order to prevent the pipe elements from becoming detached from each other. The pipe element (1) has, as an extension of the male part (3) towards the female part (2), a shoulder ring (6) which is integral with the element and the outer diameter (D3) of which is approximately the same as the outer diameter (D2) of the female part.

Abstract: The present invention discloses apparatus and methods for relining sewer mains without excavation. The sewer main is accurately measured and pre-selected short sections of reliner pipe are inserted one at a time. Visual equipment and manipulative apparatus is provided which will orient lateral openings with lateral drains. The orientation sealing and grouting of the reliner pipe can be conducted after insertion so that crews can move ahead with relining other sections of the sewer.