E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/20 (2006.01) E21B 4/16 (2006.01) E21B 4/20 (2006.01) E21B 17/03 (2006.01)
Patent
CA 2560829
The invention relates to a method and device for the drilling, in particular the percussive drilling or rotary percussive drilling of holes (9) in the ground or in rock, a bore hole (9) being formed by a drill bit (1) that is mounted on a drill pipe (3), by a percussive and/or rotary movement. Several drill points (2), which can be coupled to the drill pipe (3) and driven independently of one another, are provided on the drill bit (1). According to the invention, the drill points (2) can be uncoupled from their rigid coupling to the drill pipe (3) upon completion of the drilling process and can be displaced towards the centre of the bore hole (9), thus permitting the entire drill bit (1) together with the drill points (2) and the drill pipe (3) to be simply and reliably removed upon completion of the bore hole (9).
L'invention concerne un procédé et un dispositif de forage, notamment de forage percutant ou rotopercutant, de trous (9) dans le sol ou la pierre. Un trou (9) est foré par mouvement percutant et/ou rotatif d'une couronne de forage (1) logée sur un train de tiges (3), ladite couronne de forage (1) comportant une pluralité de têtes de forage (2) pouvant être couplées au train de tiges (3) et entraînées indépendamment. Selon l'invention, les têtes de forage (2) peuvent être découplées de leur couplage fixe avec le train de tiges (3) après achèvement du processus de forage, et déplacées en direction du centre du trou (9) de manière à permettre un retrait fiable et simple de l'ensemble de la couronne de forage (1), des têtes de forage (2) et du train de tiges (3) après forage du trou (9).
Egger-Mocivnik Rene
Mocivnik Josef
"alwag" Tunnelausbau Gesellschaft M.b.h.
Fetherstonhaugh & Co.
LandOfFree
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