A rock bolt and an anchoring device

Details A rock bolt and an anchoring device A rock bolt and an anchoring device

E - Fixed Constructions

21

D

E21D 21/00 (2006.01)

Patent

CA 2665474

The present invention relates to a rock bolt (10) comprising first (11) and second ends (12), a shaft (13) extending between the ends, and an anchoring device (23) extending along a first part of the shaft adjacent the first end. The anchoring device comprises a mandrel (29), and at least one expansion element (24) overlaying the mandrel. The expansion element is displaced radially outwardly on a predetermined relative movement between the mandrel and the expansion element. The expansion element is joined to a connector (25) to form an anchor assembly. The anchor assembly is keyed to the mandrel. The anchor assembly comprises relative rotation actuator means (42A, 42B) active during rotation of the anchoring device. The invention further relates to an anchoring device (23) per se.

L'invention concerne un boulon d'ancrage (10) comprenant une première et une seconde extrémité (12), une tige s'étendant entre les deux extrémités, et un dispositif d'ancrage (23) s'étendant le long d'une première partie de la tige jouxtant la première extrémité. Le dispositif d'ancrage comprend un mandrin (29), et au moins un élément d'expansion (24) recouvrant le mandrin. L'élément d'expansion est déplacé radialement vers l'extérieur sur un mouvement relatif prédéterminé entre le mandrin et l'élément d'expansion. Ledit élément d'expansion est relié à un raccord (25) pour former un ensemble d'ancrage, lequel est calé sur le mandrin. L'ensemble d'ancrage comprend des moyens actionneurs de rotation relative (42A, 42B) qui sont actifs pendant la rotation du dispositif d'ancrage. L'invention concerne enfin un dispositif d'ancrage en tant que tel.

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