Patent ID: 7121766

Claim:
A method of repairing a manhole, comprising the steps of: providing a liner that substantially conforms to the shape of said manhole wherein said manhole comprises an entrance, at least one wall, and a floor, wherein said floor is substantially parallel to said entrance, and said liner comprises a first layer consisting of an impermeable acid resistant material with first and second opposing surfaces and a second layer comprising fibers that are integrated into said second surface of said first layer of said impermeable acid resistant material; providing an inflatable bladder in combination with said liner wherein said bladder is in direct contact with said first surface of said first layer of said impermeable acid resistant material; applying epoxy resin to said second layer; lowering said liner, in combination with said inflatable bladder, into said manhole; inflating said bladder until said bladder conforms to said wall and said floor; curing said epoxy resin; and removing said bladder from said manhole leaving said first surface of said first layer of said impermeable acid resistant material exposed to the interior environment of said manhole.