Patent ID: 6076562
Filing Date: 2000-06-20
Classification: F16L,Y10S

Abstract:
A pre-stressed concrete pipe comprising;a hollow tubular outer pipe casing having an inner wall and opposed ends,a concrete tube within said pipe casing,a film layer of a non-cohesive material positioned between the inner wall of the pipe casing and the concrete tube, forming a superficial fissure region therebetween,a metallic double channel annular ring positioned within each end of the outer pipe casing contiguous with both the concrete tube and the casing defining a peripheral spatial pathway,joining means hermetically sealing the annular rings to the pipe casing on the casing inner wall adjacent to each end,a resilient seal ring held captive by each annular ring and contiguous with the concrete tube forming impervious restricting bands,a temporary seal disposed between each annular ring and the inner wall of the pipe casing for transitorily separating the rings from the concrete tube, anda pressurized solidifying compound disposed between the pipe casing and the concrete tube within the spatial pathways and the region coated with non-cohesive material such that the concrete of the tube is constantly compressed in an inward direction creating a stressed condition on the concrete producing supplementary tensile strength to the composite pipe.