Connecting an anchoring rod to a drilling tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/042 (2006.01) E21D 21/00 (2006.01)

Patent

CA 2454067

The invention relates to an anchoring rod (6) for rock anchoring (self- drilling injection bolts), comprising an outer thread (9) for connecting the anchoring rod (6) to a drilling tool (1) via a coupling sleeve (5). The end of the anchoring rod (6), which is screwed into the coupling sleeve (5), comprises a section (12) which has a reduced diameter in comparison with the outer diameter of the anchoring rod (6). The free end of the section (12) of the anchoring rod (6) with the reduced diameter comprises a bevel (11). An open space (23) is thus formed between the inner surface of the coupling sleeve (5) and the reduced diameter end of the anchoring rod (6). Said space stops the anchoring rod (6) from becoming stuck in the coupling sleeve, even when the end of the rod is plastically deformed during the drilling process, so that the anchoring rod (6) can be unscrewed from the coupling sleeve (5) without applying significant force.

Selon l'invention, une tige d'ancrage (6) pour des systèmes d'ancrage dans des roches (systèmes d'ancrage autoforeurs à injection) présente un filetage extérieur (9) servant à assembler la tige d'ancrage (6) avec un outil de forage (1) par l'intermédiaire d'un manchon-raccord (5). L'extrémité de la tige d'ancrage (6), vissée dans le manchon-raccord (5) présente une partie (12) présentant un diamètre inférieur au diamètre extérieur de la tige d'ancrage (6). Cette partie (12) de la tige d'ancrage (6) à diamètre réduit présente un biseau (11) à son extrémité libre. Un espace libre (23) est ainsi formé entre la surface intérieure du manchon-raccord (5) et l'extrémité de la tige d'ancrage (6) à diamètre réduit, ledit espace libre empêchant que la tige d'ancrage (6), même lorsque son extrémité est déformée plastiquement pendant le forage, soit coincée dans le manchon-raccord (5) de sorte que la tige d'ancrage (6) peut être dévissée du manchon-raccord (5) sans application d'une force importante.

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