| 摘要 |
The present invention relates to an assembly of at least two coaxial pipes (1) comprising at least two coaxial pipe assembly unit elements (n-1, n), one of which has, at one end, a first junction part (1a) assembled to a second junction part (1b) at the end of another said coaxial pipe assembly unit element, each of said first and second junction parts (1a, 1b) being a body of revolution, the assembly being characterized in that the ends of the two non-welded-together inner second branches (52a, 52b) of said first and second junction parts (1a, 1b) are in metal-on-metal contact one on the other under elastic deformation stress via their contact surface as a result of the shrinking of the weld (19) between the ends of the two outer second branches (51) of said junction parts (1a, 1b), such that said inner second cavities (6) are leaktight relative to the inside (25) of the inner pipe (22).
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