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US 4,135,958 AGranted
Method of lining a passageway with a resin absorbent tube
AssigneeInsituform International N.V.
InventorEric Wood
Life of this patent
Estimating the term…
Abstract
A lining comprising a resin absorbent tube having on the outside a fluid impermeable membrane everted into the passageway to line same using fluid pressure. The resin absorbent material is soaked in resin by trapping a quantity of resin in the lining before it everts in the passageway, and the resin is cured after the lining is everted into the passageway surface, preferably by a curing means following the everting lining along the inside of the passageway.
Claims5
A method of forming a tubular resin impregnated lining in a passageway, comprising the steps of
- (a) causing a tube of resin absorbent material to evert into the passageway by applying fluid pressure to the interior of the everted tube to force the uneverted portion of the tube to move into the passageway through the everted portion of the tube,
- (b) causing a reservoir of resin to be located in the uneverted portion of the tube which is just behind the portion of the tube that is everting into the passageway whereby the resin absorbent material is soaked by the resin in the reservoir just before that material everts, and
- (c) supporting the uneverted tube at the location of the reservoir of resin by means that move along the passageway as the tube everts.
Dependencies are inferred from the claim text.