Method and device for installing a self-drilling expandable...

E - Fixed Constructions – 21 – D

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Details

E21D 20/00 (2006.01) E21D 21/00 (2006.01)

Patent

CA 2542261

In a method and a device for installing, in a rock wall or roof, a self- drilling expandable rock bolt (2) having a drill bit portion (5), an expansion portion (9) and a connecting portion (10), in a rock breaking step, the self- drilling rock bolt (2) is provided with a rock breaking movement and flushing fluid for producing a bore hole, and in an expansion step, pressurized expansion fluid is introduced into the expansion portion (9) in order to expand it so as to be fixed to the inside of the bore hole. Expansion fluid is introduced by means of a swiveling device (6) so that the rock bolt (2) is free to move during the rock breaking step, and be tightened against the rock bolt (2) in the expansion step in such a way that a sealed channel for expansion fluid is established between an expansion fluid source and the expansion portion (9). The invention also concerns a self-drilling rock bolt.

L'invention concerne un procédé et un dispositif pour installer, dans un mur ou un plafond de pierre, un boulon d'ancrage extensible autoperceur (2) doté d'une partie trépan (5), d'une partie extension (9) et d'une partie de liaison (10). Lors d'une opération de fragmentation de roche, ce boulon d'ancrage extensible autoperceur (2) effectue des mouvements pour briser la roche et injecte un fluide pour produire un trou de forage. Lors d'une opération d'extension, le fluide d'extension sous pression est introduit dans la partie extension (9) pour l'étendre et la fixer à l'intérieur du trou de forage. Ce fluide d'extension est introduit au moyen d'un dispositif pivotant, de sorte que le boulon d'ancrage (2) peut être déplacé pendant l'opération de fragmentation de la roche, le fluide d'extension étant à nouveau comprimé contre le boulon d'ancrage (2) lors de l'opération d'extension, un canal étanche pour le fluide d'extension étant ainsi créé entre la source de fluide d'extension et la partie extension (9). La présente invention porte également sur un boulon d'ancrage extensible autoperceur.

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