Prestress conduits

Details Prestress conduits Prestress conduits

1985-06-04

1986-08-19

Marcus, Stephen

Pipes and tubular conduits

Flexible

Corrugated

52230, 138134, E04C 510

Patent

active

046063803

ABSTRACT:
To manufacture a bent prestress conduit (5) adapted to receive without damage cables (7) subjected to extremely high pulling forces, one of the faces of a metal strip (1) is coated intimately with a metal phosphate layer (4) itself covered by a soap and this metal strip is wound in helical form so as to obtain a continuous tube whose inner face is formed by the thus coated face of the metal strip.

REFERENCES:
patent: 3015969 (1962-01-01), Bratz
patent: 3114987 (1963-12-01), Harris
patent: 3359822 (1967-12-01), Hurlow

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