Method of coating metal pipe having bending capability

Details Method of coating metal pipe having bending capability Method of coating metal pipe having bending capability

1988-02-23

1988-11-22

Bryant, III, James E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

138145, 138146, 156257, B65H 8100

Patent

active

047858540

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.

REFERENCES:
patent: 3740291 (1973-06-01), Mallord
patent: 4134197 (1979-01-01), Nijs et al.
patent: 4241762 (1980-12-01), Link et al.
patent: 4333783 (1982-06-01), Gardner
patent: 4437495 (1984-03-01), Zonsveld
patent: 4544426 (1985-10-01), Stockman
patent: 4611635 (1986-09-01), Jarvis

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