Device for drilling or draining holes in soil or rock

Details Device for drilling or draining holes in soil or rock Device for drilling or draining holes in soil or rock

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 43/08 (2006.01) E21B 43/10 (2006.01) E02D 3/10 (2006.01)

Patent

CA 2341295

The invention relates to a device (1) for the drilling, notably by percussion or rotary-percussion drilling, and draining of holes in soil or rock. A drill bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the drill rod (4) or the drill bit (2, 3). In the area adjacent to the drill bit (2, 3) the jacket tube (6) has at least one through hole which opens into an annular space embodied between the drill rod and the jacket tube. In the end area adjacent to the drill bit (2, 3) the jacket tube (6) is surrounded by at least one filter tube (7) having a plurality of through holes or slits (8) which are distributed especially evenly across its circumference. This allows for correspondingly safe and reliable drainage during boring, using simple measures.

L'invention concerne un dispositif (1) de forage, notamment de forage par percussion ou par percussion rotative, et de drainage de trous réalisés dans le sol ou la roche. Une couronne de fleuret (2, 3) fixée à une tige de sonde (4) réalise un trou de forage et un tube de revêtement (6) est relié à la tige de sonde (4) ou à la couronne de fleuret (2, 3). Le tube de revêtement (6) est conçu avec au moins un passage dans la zone adjacente à la couronne de fleuret (2, 3). Ce passage débouche dans un espace annulaire formé entre la tige de sonde et le tube de revêtement de telle façon que la zone terminale adjacente à la couronne de fleuret (2, 3), le tube de revêtement (6) est entouré d'au moins un tube de tamisage qui est formé par plusieurs orifices ou fentes traversants (8) uniformément répartis sur la périphérie. Des mesures simples permettent d'obtenir un drainage sûr et fiable de façon correspondante pendant l'opération de forage.

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