Method of coating metal pipe having bending capability
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United States of America Patent
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-
Nov 22, 1988
Issued Date -
N/A
app pub date -
Feb 23, 1988
filing date -
Nov 25, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a concrete-wrapped pipe having an inner water-impermeable resinous coating, the concrete wrapping is formed with a continuous inner portion covering the resinous coating and a helically slotted outer portion, the helical slot extending at least to the depth of a mesh reinforcement embedded in the concrete. The structure is characterized by the fact that the inner portion of the concrete wrapping is formed with one or more helically extending zones of reduced compressive strength, radially aligned with the helical slot or slots in the outer portion. The helical configuration breaks the continuityof the concrete wrapping in the longitudinal direction of the pipe and, even with pipe of relatively large diameter, enables the wrapping to accommodate limited bending of the pipe.
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