Process for repairing or restoring in situ, a section of a...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 55/168 (2006.01) B29C 63/10 (2006.01) B65H 81/08 (2006.01)

Patent

CA 2092690

The process consists of the following steps: a) sealing, if need be, any defect in the section with the aid of a sealing material; b) fixing onto the pipe (2) the end of a flexible profile (3) made of longitudinal fibres coated in a thermoplastic matrix, the elastic limit of said fibres being greater than that of the pipe (2) or chamber material: c) rotating means (7) about pipe (2) axially displacing said means along the latter in order to supply said profile (9); d) tensionally winding the profile (9) in successive spirals around the pipe (2) at and near said section, on either side of the latter by heating in order to melt substantially the entire matrix mass, and then by cooling the profile upon application; (e) the number of profile layers superposed at the same location and the angles and winding tension of said profile (9) being sufficient to restore to the pipe section or chamber (2) its predefined mechanical features. Applicable especially in repairing or restoring in-situ, a pipe or chamber section for receiving pressurized fluid.

On effectue les étapes suivantes: a) si nécessaire, on obture tout défaut quelconque éventuel du tronçon au moyen d'un matériau d'obturation; b) on fixe à la canalisation (2) l'extrémité d'un profilé (9) flexible constitué de fibres longitudinales enrobées dans une matrice thermoplastique, et dont la limite élastique est supérieure à celle du matériau de la canalisation ou enceinte (2); c) on fait tourner autour de la canalisation (2), et on déplace axialement le long de celle-ci, des moyens (7) pour amener le profilé flexible (9); d) on enroule sous tension suivant des hélices successives ledit profilé flexible (9) autour de la canalisation (2) à l'endroit et au voisinage dudit tronçon de part et d'autre de celui-ci, en chauffant de façon à faire fondre sensiblement dans toute sa masse ladite matrice puis en refroidissant le profilé dès son application; e) le nombre de couches du profilé superposées en un même endroit ainsi que les angles et la tension d'enroulement du profilé (9) étant suffisants pour redonner audit tronçon de la canalisation ou enceinte (2) des caractéristiques mécaniques prédéterminées. Utilisation notamment pour réparer ou restaurer sur place un tronçon d'une canalisation ou enceinte destinée à recevoir un fluide sous pression.

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