A rock bolt assembly

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 20/02 (2006.01) E02D 5/74 (2006.01)

Patent

CA 2244617

A rock bolt assembly and a method of stabilising a rock mass by means of the rock bolt assembly is disclosed. The rock bolt assembly comprises a rock bolt (3), a nut (5) on a threaded section (9) of the rock bolt, and a barrier (41), such as a washer, which prevents removal of the nut. The method includes the steps of: (i) rotating the nut (5) in a first direction against the barrier and thereafter rotating the nut and the rock bolt (3) and mixing resin in a drilled hole (11) in the rock mass; and (ii) after the resin has set, rotating the nut (5) in the opposite direction (away from the barrier) against the rock mass and thereby tensioning the rock bolt (3).

Ensemble de boulon d'ancrage et méthode pour stabiliser une masse rocheuse au moyen d'un ensemble de boulon d'ancrage. L'ensemble de boulon d'ancrage comprend un boulon d'ancrage (3), un écrou (5) sur une partie filetée (9) du boulon d'ancrage, et une barrière (41), telle une rondelle, qui empêche l'enlèvement de l'écrou. La méthode comprend les étapes suivantes: (i) faire tourner l'écrou (5) dans un premier sens contre la barrière et ensuite faire tourner l'écrou et le boulon d'ancrage (3) et mélanger la résine dans un trou foré (11)dans la masse rocheuse; et (ii) une fois que la résine a durci, faire tourner l'écrou (5) dans le sens opposé (en s'éloignant de la barrière) contre la masse rocheuse, ce qui met le boulon d'ancrage (3) en tension.

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