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AssigneeTunetanken A/S
InventorKarl Erik Hovad
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There is described a method and a liner for in situ renovation of a sewer manhole, e.g., a transition well, where inside the well there is inserted a prefabricated liner in the shape of a glass fiber reinforced stocking of thermosetting polyester or epoxy formed by winding, weaving or braiding externally of a unilaterally suspended mold with a diameter allowing the mold to be lowered through a manhole curb or cone, the rubber coating consisting of a detachable rubber bag that is fastened to a flange to be displaced externally on the mold, the polyester or epoxy liner being wound, woven or braided in such a way that the length/diameter ratio of the liner may subsequently be changed by changing the length/diameter ratio of the liner as the polyester or epoxy impregnated glass fibers are connected with the flange by the winding, weaving or braiding.
A method for in situ renovation of underground tanks or manholes, where a prefabricated liner of reinforced plastic is placed at an inner wall of a cavity, comprising using a liner in the form of a glass fiber reinforced stocking of thermosetting polyester or epoxy formed on a rubber coated mold to place the liner in the tanks or manholes, the liner including a length to diameter ratio which is changed by changing an angle of inclination of the glass fibers relative to a longitudinal axis of the liner so as to adjust a cross-section of the liner and simultaneously adjust a length of the liner.
A prefabricated liner for in situ renovation of underground cavities or manholes, comprising a liner of polyester or epoxy impregnated glass fibers with a wall thickness between 5 and 10 mm, a length and a doomed bottom formed on a tubular mold covered by a detachable rubber bag with the bag being expandable to place the liner in the underground cavities or manholes and is fastened to a flange which may be displaced externally of the tubular mold, and which is connected to the glass fibers.
Dependencies are inferred from the claim text.