초록 ▼

Improvements in the technique of sliplining a buried pipe, so as to minimize adverse affects of differences in expansion and contraction of the old and new pipe, while maintaining seals at the ends thereof is disclosed employing at each pipe end a sleeve-like pliable gasket, which is expanded outwar

Improvements in the technique of sliplining a buried pipe, so as to minimize adverse affects of differences in expansion and contraction of the old and new pipe, while maintaining seals at the ends thereof is disclosed employing at each pipe end a sleeve-like pliable gasket, which is expanded outwardly into contact with the inner surface of the old pipe, and somewhat beyond the end of the old pipe, is contracted inwardly into contact with the other surface of the new or sliplined pipe. The sleeve-like gasket can compensate for thermally induced pipe line and liner axial length changes, without breaking the seal between the two, while seal installation is facilitated by the accessability of the sleeve-like gaskets extending beyond the ends of the old pipe.

대표청구항 ▼

The method of retrofitting an in-ground drainage system with a drain pipe liner comprising the steps of: providing an elongated access opening in an existing drain pipe; providing a flexible sleeve-like gasket; sealing a circumferential end portion of the outer surface of said flexible sleeve-like g

The method of retrofitting an in-ground drainage system with a drain pipe liner comprising the steps of: providing an elongated access opening in an existing drain pipe; providing a flexible sleeve-like gasket; sealing a circumferential end portion of the outer surface of said flexible sleeve-like gasket to the drain pipe inner surface to provide a first seal; feeding a flexible liner into the access opening along the drain pipe and through said gasket until the liner lead end reaches a drain pipe accessible end; and sealing a circumferential end portion of the inner surface of said flexible sleeve-like gasket to the flexible liner outer surface near the lead end thereof and adjacent said drain pipe accessible end to provide a second seal, said first and second seals being separated somewhat along the common axis of elongation of the drain pipe and liner, whereby a body portion of said sleeve-like gasket between said seals is free to flex to accommodate any expansion and contraction of said liner.