Patent ID: 7186060
Filing Date: 2007-03-06
Classification: B29C,F16L

Abstract:
1. A tubular culvert interior lining method, said method comprising steps of: (1) forming an initial part of a tubular body by spirally winding a continuously supplied elongated strip-like member having first and second edge parts, said strip-like member having joint parts formed on said first and second edge parts, and mutually engaging said joint parts that are in contact with each other; (2) leaving said initial part of a tubular body in place in an interior of a tubular culvert; (3) continuing formation of said tubular body by means of supplying more of the strip-like member in front of said initial part of a tubular body; and (4) injecting back-filling material from an injection tube in synchronization with the formation of said tubular body; using an apparatus comprising a closed type forming frame which is devised so that this forming frame is freely bendable by means of a link mechanism comprising a series of connected link bodies, and in which the inward folding of the respective links is restricted; a plurality of guide rollers which are mounted around said forming frame so that these guide rollers are free to rotate, and which contact the inside surface of the tubular body that is formed by spirally winding a strip-like member; a joining mechanism part which is attached to said forming frame, and which consists of an outer face roller and inner face roller that are disposed in the joint area between said already-formed tubular body and newly supplied strip-like member, and that clamp and join the strip-like member, wherein said outer face roller has hook parts that are inserted into the recessed grooves of said strip-like member; a freely rotating contact roller which is disposed in said joining mechanism part, and whose outside surface protrudes to the outermost point and contacts the wall surface of the tubular culvert; and a back-filling material injection tube which is disposed after said joining mechanism part in the direction of advance adjacent to the outer face roller of said joining mechanism part, and which has at least a discharge port for the back-filling material located to the inside of said outer face roller; wherein when the restriction of inward folding of the link bodies of the forming frame to which said joining mechanism part is attached is released, said forming frame is caused to rotate, the link bodies of said joining mechanism part are placed in an inwardly folded state via said contact roller that is caused to contact the wall surface of the tubular culvert, a tubular body is formed by spirally winding the strip-like member around said forming frame.