Tube-formed rock bolt

E - Fixed Constructions – 21 – D

Patent

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E21D 21/00 (2006.01)

Patent

CA 2371136

Tube-formed rock bolt with closed profile intended to be anchored in a bore hole. The bolt is anchored in the bore hole through internal pressurisation with a fluid, for instance water, so that its diameter is plastically expanded into contact with the wall of the hole. The bolt has before its expansion a cross-section whose peripheral length exceeds the circumference of the hole but a largest diameter, which is smaller than that of the hole. In order to obtain a profile being sufficiently flexible for expansion and at the same time having a sufficiently large cross-sectional area for the strength the tube has a varying wall thickness in a peripheral direction. This is achieved by making the tube-formed bolt by means of extrusion of an aluminium-based material.

L'invention concerne un boulon d'ancrage tubulaire doté d'un profil fermé destiné à être ancré dans un trou de forage. Le boulon est ancré dans le trou de forage par pressurisation interne par un fluide, par exemple, de l'eau de telle façon que son diamètre soit plastiquement élargi et qu'il vienne en contact avec la paroi du trou. Avant son expansion, le boulon a une section transversale dont la longueur périphérique excède la circonférence du trou mais son diamètre le plus large est inférieur à celui du trou. Ain d'obtenir un profil qui soit suffisamment flexible pour l'expansion tout en ayant une zone section transversale suffisamment large aux fins résistance, le tube a une paroi dont l'épaisseur varie dans la direction périphérique. A cet effet, le boulon tubulaire est réalisé par extrusion d'un matériau à base d'aluminium.

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