A rock bolt and method of installing a rock bolt

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 20/02 (2006.01) B21H 3/04 (2006.01) B21H 3/06 (2006.01) E21D 21/00 (2006.01) F16B 23/00 (2006.01) B21H 3/08 (2006.01)

Patent

CA 2197997

The invention relates to a rock bolt (1) and method of installing a rock bolt, particularly a hollow bolt. The method of installation utilises a chemical anchor, the components of which are provided in a cartridge (4) which is either injected through the bolt or removably attached to an end thereof. The bolt preferably includes a thread (40) formed by plastically deforming the walls (41) of the bolt so as to maximise tensile strength whilst minimising wall thickness.

L'invention porte sur un boulon (1) d'encrage dans la roche, en particulier sur un boulon creux, et sur son procédé de mise en place. Le procédé de mise en place fait appel à un élément d'encrage chimique dont les composants sont contenus dans une cartouche (4) qui peut être soit injectée à travers le boulon soit fixée amovible à l'extrémité de celui-ci. Le boulon comporte de préférence un filetage (40) constitué par déformation plastique de sa paroi (41), de manière à obtenir une résistance maximale à la traction tout en ménageant une épaisseur de paroi aussi faible que possible.

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