| 摘要 |
The present invention relates to a unit element of undersea pipe, in particular for providing a bottom-to-surface connection, constituted by an assembly of two coaxial pipe elements of the PiP type ( 1 ) presenting an inner pipe element ( 2 ) and an outer pipe element ( 3 ) coaxial thereabout with an annular space ( 4 <SUB>1</SUB>) between the pipes, preferably including a thermally insulating material ( 4 <SUB>2</SUB>) in said annular space, and including at each end a junction piece ( 6, 6 a- 6 b) in the form of a steel forging for connecting together two of said unit elements of axial pipe ( 1 ), said junction forgings ( 6 ) being welded to the ends of both of said inner and outer pipes, said unit elements being characterized in that said inner pipe element ( 2 ) comprises in its main portion an inner tube ( 2 <SUB>1</SUB>) of metal presenting thickness that is small relative to the thickness of the ends of said inner pipes that are welded to said junction forgings ( 6 ), the thickness of said inner tube being less than 50% the thickness of said ends of said inner pipe, said inner tube ( 2 ) being covered in a material ( 2 <SUB>2</SUB>) comprising longitudinal continuous fibers wound around said inner tube so as to cover the surface of said inner tube entirely.
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