Patent ID: 8821068
Filing Date: 2014-09-02
Classification: B29C,E02D,E03F,E04B

Abstract:
1. A method of lining a manhole having a wall of varying diameters along its height, comprising: taking a manhole liner having a tubular shape and a substantially unstretched diameter; 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 toward the wall of the manhole, creating folds in the liner as it bunches upon itself to fit along portions of the wall of the manhole; allowing the resinous material to cure and harden to produce a substantially smooth finished surface along the portions of the wall where the liner has folded and bunched upon itself; and removing the bladder from the manhole.