Rock bolt and method of manufacture and installation

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E21D 20/00 (2006.01) E21D 20/02 (2006.01)

Patent

CA 2405799

The application discloses a rock bolt (1) shaped and adapted to be inserted and fixedly installed into a rock hole (50) the bolt including: a load-bearing tendon(10) and a load-transfer medium(20) of at least a first material, the load-transfert medium being formed to completly surround the tendon (10) over at least a portion of the lenghth of the tendon, wherein, when the bolt (1) is installed in the rock hole (50) the load-transfert medium (20) functions to transfert to the tendon (10) a force applied from a source external to the bolt so that the load is borne substantially by the tendon. The bolt may include a cover provided over at least a portion of the transfert medium. A method of manufacturing a rock bolt, a method of installing a bolt in a bore-hole, and a method of manufacturing a rock bolt and subsequently inserting and installing the bolt in a rock hole are also disclosed.

Cette invention a trait à un boulon d'ancrage (1) dont la forme est calculée pour permettre son insertion et sa mise en place à demeure dans un trou de roche (50). Ce boulon comporte une armature de précontrainte porteuse de charge (10) ainsi qu'un milieu de transfert de charge (20) d'au moins un premier matériau, ce milieu de transfert de charge étant formé de manière à enserrer complètement le tendon (10) sur au moins une partie de sa longueur. Lorsque le boulon (10) est mis en place dans le trou de roche (50), le milieu de transfert de charge (20) transfère au tendon (10) une force exercée par une source extérieure au boulon, de sorte que la charge est quasiment supportée par le tendon. Le boulon peut comporter une protection placée au-dessus d'au moins une partie du milieu de transfert. Cette invention porte également sur un procédé de fabrication du boulon d'ancrage, sur un procédé de mise en place de celui-ci dans un trou de forage ainsi que sur un procédé de fabrication de boulon d'ancrage et d'insertion comme de mise en place ultérieure dans un trou de roche.

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