Rock bolts with expandable element

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E02D 5/80 (2006.01) E21D 20/00 (2006.01)

Patent

CA 2473255

In a method and device for drilling, in particular impact drilling or rotary percussion drilling, a hole in soil or rock material and forming an anchorage in said hole, wherein a bore hole is formed by the introduction of a drill bit (2), it is provided that the drill rod assembly of the drilling device is comprised of at least one expandable element (3, 4) having at least one hollow space extending substantially in the longitudinal direction of the bore for introducing a fluid under pressure to at least partially widen the outer periphery of the expandable element (3, 4), and/or the drill rod assembly is connected with at least one expandable element (3, 4) each including at least one hollow space substantially extending in the longitudinal direction of the bore for introducing a fluid under pressure to widen the outer periphery, thus ensuring a safe anchorage by the expansion of the expandable elements (3, 4) both over the periphery and over the length of the device at a simplified overall construction.

L'invention concerne un procédé et un dispositif de forage, en particulier percutant ou rotopercutant, d'un trou dans une matière de sol ou rocheuse et de formation d'un ancrage, un trou de forage étant formé par l'introduction d'une couronne de forage (2). Selon la présente invention, les tiges de forage du dispositif de forage sont formées par au moins un élément expansible (3, 4), présentant une cavité qui s'étend sensiblement dans le sens longitudinal du forage et servant à l'introduction d'un fluide sous pression pour l'expansion au moins partielle de la périphérie extérieure de cet élément expansible (3, 4), et/ou ces tiges de forage sont raccordées à au moins un élément expansible (3, 4), présentant au moins une cavité qui s'étend sensiblement dans le sens longitudinal du forage et servant à l'introduction d'un fluide sous pression pour l'expansion de la périphérie extérieure dudit élément. On obtient ainsi, avec une construction simplifiée, un ancrage fiable par l'expansion desdits éléments expansibles (3, 4) dans les sens périphérique et longitudinal dudit dispositif.

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