A rock anchor

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/02 (2006.01)

Patent

CA 2706468

The invention relates to a rock anchor including an elongate, hydraulically inflatable anchor tube made of a ductile material and defining a closed leading end, a trailing end, and a tube cavity extending between the ends. The rock anchor of the invention includes an end cap on a trailing end of the tube, defining a feed aperture in communication with the tube cavity for pressure feeding a liquid substance into the tube cavity for inflating the tube. The end cap includes pressure indicator means configured for indicating when, as a result of pressure feeding of a liquid substance into the tube cavity, a predetermined installation pressure is reached in the tube cavity. The pressure indicator means typically includes a pressure indicator formation displaceable under pressure in the tube cavity, with such displacement being visible from the outside of the end cap.

L'invention concerne un ancrage au roc comportant un tube d'ancrage oblong gonflable hydrauliquement constitué d'un matériau ductile et définissant une extrémité avant obturée, une extrémité arrière, et une cavité de tube s'étendant entre les deux extrémités. L'ancrage au roc de l'invention comporte une coiffe sur une extrémité arrière du tube, définissant une ouverture d'alimentation communiquant avec la cavité de tube permettant d'alimenter sous pression la cavité de tube en une substance liquide servant à gonfler le tube. La coiffe comporte un moyen indicateur de pression conçu pour indiquer que la cavité de tube a atteint une pression d'installation prédéterminée suite à l'alimentation sous pression de la cavité de tube en substance liquide. Le moyen indicateur de pression comporte généralement un élément indicateur de pression déplaçable sous pression dans la cavité de tube, ce déplacement étant observable de l'extérieur de la coiffe.

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