Patent ID: 9074338
Filing Date: 2015-07-07
Classification: B29C,E02D,E03F,E04B

Abstract:
1. A method of lining a manhole having a wall with varying diameters along its height, comprising: taking a manhole liner having a tubular shape and an unstretched diameter at least partially larger than a smallest diameter of the manhole; impregnating the liner with a resinous material capable of curing and hardening; positioning the liner in the manhole; inserting a bladder into the liner; expanding the bladder to press the liner against the wall of the manhole; wherein the liner can fold over on itself along at least a portion of the liner; allowing the resinous material to cure and harden to produce a smooth finished surface, including along the portion of the liner folded on itself; and removing the bladder from the manhole.