Prestress conduits
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United States of America Patent
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Aug 19, 1986
Issued Date -
N/A
app pub date -
Jun 4, 1985
filing date -
May 21, 1982
priority date (Note) -
Expired
status (Latency Note)
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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.
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