Self drilling rock bolt

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E02D 5/74 (2006.01) E02D 5/76 (2006.01) E02D 5/80 (2006.01) E21D 20/00 (2006.01) F16B 13/00 (2006.01)

Patent

CA 2624690

A self drilling rock bolt (10) incorporating a shaft (13) and an anchoring device (23). A first end (11) of the bolt has a drill tip (16) to penetrate rock and a second end (12) is adapted to be connected to a drilling apparatus to allow rotation of, and thrust to, the bolt. A circulation passage is provided to allow fluid to be passed to the drill tip (16) and in one form a central passage (14) is formed in the shaft (13) to form part of this circulation passage. The anchoring device (23) is operative to retain the bolt when located in a drilled hole and comprises a mandrel (29) having one or more inclined external surface (29, 30) mounted to, or integrally formed with, the shaft (13) and at least one expansion element (24) overlaying the mandrel. The expansion element(s) (24) is displaced radially outwardly on a predetermined relative movement between the mandrel (29) and the element (24).

L~invention concerne un boulon de roche autoforeur (10) incorporant une tige (13) et un dispositif d~ancrage (23). Une première extrémité (11) du boulon présentant une pointe de forage (16) destinée à pénétrer dans la roche et une deuxième extrémité (12) conçue pour être couplée à un appareil de forage servant à faire tourner et à enfoncer le boulon. Un passage de circulation permet d~amener un fluide jusqu~à la pointe de forage (16). Dans un mode de réalisation, un passage central (14) ménagé dans la tige (13) forme une partie de ce passage de circulation. Le dispositif d~ancrage (23) permettant de maintenir le boulon dans un trou foré comprend un mandrin (29) présentant une ou plusieurs surfaces externes inclinées (29, 30) monté sur la tige (13) ou solidaire de celle-ci, et au moins un élément de dilatation (24) le recouvrant. Ledit au moins un élément de dilatation (24) se déplace radialement vers l~extérieur suite à un mouvement relatif prédéterminé du mandrin (29).

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