Scaling bar

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 37/02 (2006.01) E21C 37/26 (2006.01)

Patent

CA 2421024

A scaling bar for prying overhanging rocks from rocky wall structures. The scaling bar comprises an elongated tubular shaft and a first pick member attached to one end thereof, and, optionally, a second pick member attached to a second end thereof. At least one of the two pick members comprises an end portion closely fitted into engagement with the tubular shaft, a tip portion defining a substantially sharp leading edge for easier penetration in the rocky structure, and a cam element. The cam element comprises a first and a second leverage bulges, whereby by displacing the shaft, a lever is formed for dislodging unstable overhanging rocks with minimized physical effort from the workman. The second inner leverage bulge provides greater leverage to the tip portion than the first leverage bulge, but the size of the first leverage bulge is smaller, and can hence engage narrower clefts than the second leverage bulge. In use, a workman axially inserts the pick member of the scaling bar in a cleft adjacent to an unstable overhanging rock, and applies a transverse load by prying the unstable rock using the leverage provided by the first leverage bulge, hence widening the cleft. Subsequently, if necessary, the pick member is further axially driven into the cleft, and the workman again applies a transverse load to pry the rock away again using the leverage provided by the second leverage bulge. This procedure can be repeated so as to sink further into the rock bed, until the rock has been dislodged from its bed.

L'invention concerne une barre de purgeage conçue pour déloger les blocs de pierre en surplomb sur des parois rocheuses. Ladite barre de purgeage est formée d'un arbre tubulaire allongé et d'un premier élément piqueur fixé à l'une de ses extrémités et, optionnellement, d'un deuxième élément piqueur fixé à une deuxième extrémité. Au moins l'un des deux éléments piqueurs comprend un bout conçu pour se loger étroitement dans l'arbre tubulaire, une pointe définissant un bout d'attaque sensiblement aigu pour pénétrer plus facilement dans la structure rocheuse et, enfin, un élément de came. Ce dernier comprend un premier et un deuxième renflements servant de levier grâce auxquels on peut déloger les rochers instables en surplomb avec un minimum d'efforts, le deuxième renflement produisant un effet de levier plus prononcé que le premier sur la pointe, mais le premier, plus petit, permettant de s'attaquer à des fissures plus étroites. Concrètement, un travailleur insère axialement la barre de purgeage dans une fissure adjacente à un rocher instable en surplomb et applique une force transversale en donnant à la barre un effet de levier au moyen du premier renflement, ce qui élargira la fissure. S'il y a lieu, on répétera l'opération à l'aide du deuxième renflement jusqu'à ce que le rocher se détache de son lit.

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