Liner assembly for lining branch pipes and a method for manufacturing the liner assembly

Abstract

A lining assembly for lining the inner wall of a branch pipe connected to a main pipe having a flexible tubular resin-impregnated liner that has one end externally reversed to form a collar to fit the inner wall of the main pipe. A first hermetic film covers the internal wall of the tubular liner and a second hermetic film covers the external wall of the tubular liner. An annular resin-absorbent flat felt backs the collar. A detectable resilient tube consisting of a tubular reinforcement material and a third hermetic film covering the internal wall of the tubular reinforcement material are provided, the upper end portion of the third hermetic film being detachably adhered to the second hermetic film covering the external wall of the flexible tubular resin-impregnated liner near the collar, and the detachable resilient tube enclosing in it a sufficient part of the flexible tubular film-covered liner which is in the vicinity of the collar to thereby support that part of the liner to be erect toward the opening of the branch pipe. A pressure proof-tube consisting of three detachable divisions, contains in it the flexible tubular resin-impregnated liner lengthwise, the front end of the pressure proof-tube being connected to the detachable resilient tube and the rear end being closed.

Dependencies are inferred from the claim text.