Tensioning hydraulic nuts

B - Operations – Transporting – 25 – B

Patent

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Details

B25B 29/02 (2006.01)

Patent

CA 2365284

A hydraulic tensioning system (25) for nuts (21) on studbolts (19) has a puller bar (35) and a puller buddy (37) which are coupled to the studbolt (19), and a bridge (38) around the nut (20). The puller bar (35) is internally coupled to the studbolt (19) and the puller buddy (37) is externally coupled to the studbolt (19) (and may engage the nut (20) before the tension is applied). The nut (20) can comprise a cone nut (21) which co-operates with a complementary collar or shell (23) with a conical inner face (23a) and a spherical base washer (25).

L'invention concerne un système de tension hydraulique (25) pour des écrous (21) insérés sur des boulons d'ancrage (19). Ce système est muni d'un élément de tension (35) et d'un organe de charge (37) couplés au boulon d'ancrage (19), un pont (38) entourant par ailleurs chaque écrou (20). L'élément de tension (35) est intérieurement couplé au boulon d'ancrage (19), l'organe de charge (37) étant extérieurement couplé à ce dernier (de sorte qu'il peut entrer en contact avec l'écrou (20) avant que la tension ne soit appliquée). L'écrou (20) peut comporter un écrou conique (21) qui coopère avec un collet ou une enveloppe complémentaire (23) présentant un coté intérieur conique (23a) et une rondelle (25) à base sphérique.

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