| 摘要 |
A point of junction of tubular metallic structures, notably for derrick platforms, includes a tubular element on which are welded the tubes which form the point of junction. At least one steel stiffening element, formed of a cylindrical main portion coaxial with the tubular element and provided with annular ribs, is ferruled inside the tubular element with a ferruling rate sufficient for preventing it from being disunited from the tubular element.
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