Method and device for boring holes in soil or rock

Details Method and device for boring holes in soil or rock Method and device for boring holes in soil or rock

E - Fixed Constructions

21

B

E21B 7/20 (2006.01)

Patent

CA 2540569

The invention relates to a method and a device for boring, especially for the percussion boring or rotary percussion boring of holes in soil or rock. According to the invention, a borehole is formed by a percussive and/or rotary movement carried out by a bore-crown (2) mounted on a boring rod (3), and a jacket tube (6) coupled to the bore-crown (2) is introduced into the borehole. Said jacket tube (6) is received in a receiving element (5) on the end of an envelope tube (4) coupled to the bore-crown (2), said end opposing the extraction surface of the bore-crown (2), and the jacket tube (6) is subjected to a percussive or compression stress on the end thereof opposing the bore- crown, in such a way as to be able to bore precisely in terms of direction.

L'invention concerne un procédé et un dispositif de forage, notamment de forage percutant ou rotopercutant, de trous dans de la terre ou de la pierre. Une couronne de forage (2) logée sur un train de tiges (3) sert à former un trou de forage par mouvement de percussion et/ou de rotation, et une tubulure de gainage (6) couplée à la couronne de forage (2) est logée dans le trou de forage. Selon l'invention, la tubulure de gainage (6) est logée dans un logement (5) sur l'extrémité d'une tubulure d'enveloppe (4) couplée à la couronne de forage (2), opposée à la surface d'extraction de la couronne de forage (2), et la tubulure de gainage (6) est soumise à une contrainte de percussion ou de pression sur l'extrémité opposée à la couronne de forage, de manière à obtenir une bonne précision dans la direction de forage.

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