Method and device for drilling a hole in soil or rock...

E - Fixed Constructions – 02 – D

Patent

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Details

E02D 5/76 (2006.01) E02D 5/80 (2006.01)

Patent

CA 2559446

The invention concerns a method and device for boring, particularly percussion boring or rotary percussion boring, a hole (2) in soil or rock material and for forming an anchoring. According to the invention, a borehole (2) is formed by inserting a drill bit (4), and tensioning elements (10) coupled to the drill bit (4) are introduced into the borehole (2) during the boring process. Once the borehole (2) is completed, the boring rods (5) are detached from the drill bit (4) and removed from the borehole (2). The boring rods (5) are provided with a hollow space (22) extending essentially in the longitudinal direction of the boring rods (5) and serving to introduce a hardenable fluid into the borehole (2) as the boring rods (5) are removed from the borehole (2). Anchoring or fixing elements (14) for anchoring on the inner wall of the borehole are provided on the drill bit (4) at the end opposite the drilling surface and/or on the tensioning elements (10). The tensioning elements (10) are, at the end (12) protruding from the borehole (2), subjected to a turning or twisting whereby shortening their effective length for tensioning or centering so that a centering and an optionally temporary tensioning of the tensioning elements (10) can be effected before the hardenable material completely hardens.

L'invention concerne un procédé et un dispositif permettant de forer, notamment de forer par percussion ou par rotopercussion, un trou (2) dans un sol ou un matériau rocheux et de former un ancrage. Un trou de forage (2) est formé par insertion d'une couronne de forage (4) et des éléments de serrage (10) accouplés à la couronne de forage (4) sont introduits dans le trou de forage (2) pendant le processus de forage. Une fois le trou de forage (2) terminé, le train de tiges (5) est séparé de la couronne de forage (4) et est sorti du trou de forage (2). Le train de tiges (5) est formé avec un espace creux (22) s'étendant sensiblement dans le sens longitudinal du train de tiges (5) et destiné à l'introduction d'un fluide durcissable dans le trou de forage (2) pendant le retrait du train de tiges (5) hors du trou de forage (2). Il est prévu de monter des éléments d'ancrage et de fixation (14) sur la couronne de forage (4), à l'extrémité opposée à la surface de taille et/ou au niveau des éléments de serrage (10), pour un ancrage contre la paroi intérieure du trou de forage. Il est également prévu que les éléments de serrage (10) puissent être sollicités, à l'extrémité (12) en saillie du trou de forage (2), en rotation ou en torsion, de manière à réduire la longueur efficace desdits éléments, en vue d'une contrainte ou d'un centrage, de sorte à permettre un centrage et une contrainte éventuellement temporaire des éléments de serrage (10), dès avant une prise complète du matériau durcissable.

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