E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/07 (2006.01) E21B 31/00 (2006.01)
Patent
CA 2619175
The invention relates to a method and a device for releasing a block on a bore- crown (1) during a boring process, especially percussion boring or rotary percussion boring, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown (1) mounted on a boring rod (2) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore- crown (1) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown (1), the bore-crown (1) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod (2), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection (7, 9) between the end of the boring rod (2) facing the bore-crown (1), and the bore-crown (1), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown (1).
L'invention concerne un procédé et un dispositif d'élimination du blocage d'une couronne (1) lors du forage, notamment lors du forage percussif ou du forage rotatif percussif de trous dans le sol ou de la pierre. Une couronne (1) logée et connectée sur le train de tiges (2), amenée en rotation et en mouvement percussif par le train de tiges (2), permet de forer un trou. En cas de blocage de la couronne (1) empêchant la poursuite du forage et la rotation de la couronne (1), la couronne (1) est soumise à un mouvement linéaire contre le sens de forage, et à une rotation opposée au sens de la rotation de forage sous l'effet d'un dispositif (7, 9) disposé entre l'extrémité du train de tiges (2) orientée vers la couronne (1), et la couronne (1), indépendamment d'un entraînement rotatif destiné au forage. Ainsi, le trou peut être foré simplement après élimination du blocage de la couronne (1).
"alwag" Tunnelausbau Gesellschaft M.b.h.
Fetherstonhaugh & Co.
LandOfFree
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