Superimposed coverings having increased stability

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 3/06 (2006.01) F16L 13/02 (2006.01) F16L 55/168 (2006.01) F16L 58/16 (2006.01) F16L 58/18 (2006.01)

Patent

CA 2192676

An article, for example a pipe (11a, 11b), has a first covering (13a, 13b) such as a polymer layer, and a second covering, such as a repair patch (18a) or a repair deposit of melt-on adhesive (22) or a wrap or a sleeve (16) protecting a welded joint (12) between two lengths (11a, 11b) of such pipe. The second covering (16) may have a functional coating (16b) on an underside which is applied on and is at least partially superimposed over the first covering (13a, 13b). A cured deposit (17, 21, 23) of thermoset resin is applied at least over the edges of the second covering (16, 18a, 22), for example in the form of a fibrous tape impregnated with a curable resin composition, and bonds to the first (13a, 13b) and second covering (16, 18a, 22). The resin deposit (17, 21, 23) provides the second covering (16, 18a, 22) with increased stability against displacement laterally of said first covering (13a, 13b), for example as a result of soil stress.

Un article, par exemple une conduite (11a, 11b) a un premier revêtement (13a, 13b) sous la forme d'une couche de polymère et un second revêtement, par exemple une pièce de réparation (18a), un dépôt de réparation constitué d'un adhésif (22) appliqué par fusion, un élément enroulé ou un manchon (16) protégeant la soudure (12) entre deux longueurs (11a, 11b) de la conduite. Le second revêtement (16) peut avoir une couche (16b) ayant une fonction spéciale sur son côté inférieur et il se superpose au moins partiellement sur le premier revêtement (13a, 13b). Un dépôt (17, 21, 23) d'une résine thermodurcissable est appliqué au moins sur les bords du second revêtement (16, 18a, 22), par exemple sous la forme d'un ruban fibreux imprégné d'une résine thermodurcissable, pour fixer le premier revêtement (13a, 13b) au second (16, 18a, 22). Le dépôt de résine (17, 21, 23) améliore la résistance du second revêtement (16, 18a, 22) contre les risques de déplacement latéral par rapport au premier revêtement (13a, 13b), par exemple sous l'effet de contraintes se produisant dans le sol.

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