Anchor eye-bolt for mine roof

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E21D 11/00 (2006.01) E21F 17/02 (2006.01) F16B 45/00 (2006.01)

Patent

CA 2176516

An anchor eye-bolt for use in strengthening a mine roof as well as for supporting mine installation below the roof. The anchor eye-bolt of the present invention comprises broadly an elongated stem having on a first end thereof a threaded portion for engaging into an expansion-type anchor shell, and a polygonal bolt head forming a second end thereof. The polygonal bolt head comprises a circular pressure bearing surface on a first side thereof adjoining the stem, and an eyed projection extending from a top surface thereof. The circular pressure bearing surface preferably has a diameter as large as an across-corner dimension of the polygonal bolt head. The eyed projection preferably has a width similar to an across-flat dimension of the polygonal bolt head. A thickness of the eyed projection is preferably substantially a same dimension as a diameter of the stem. In another aspect of the anchor eye-bolt of the present invention, there is provided a tension washer used in combination with that anchor eye-bolt. The tension washer mounts on the anchor eye-bolt against the pressure bearing surface of the polygonal bolt head. The tension washer has a bent portion and a hole through that bent portion for receiving an attachment of a cord member used in strengthening a mine roof.

Cette invention concerne un boulon d'ancrage à anneau servant au renforcement d'un toit de galerie de mine ainsi qu'à la mise en place d'équipements suspendus audit toit. Le boulon d'ancrage objet de la présente invention comprend en gros une tige allongée filetée à un bout et se vissant dans une coquille d'expansion, et une tête polygonale à l'autre bout. La tête de boulon polygonale présente, côté tige, une portée circulaire et, du côté opposé, un anneau en saillie. La portée circulaire a de préférence un diamètre égal à la largeur surangles de la tête; l'anneau a de préférence la même largeur que la largeur sur méplats de la tête de boulon et une épaisseur sensiblement égale au diamètre de la tige du boulon. Dans une autre variante de l'objet de la présente invention, il est prévu une rondelle de traction à poser contre la portée du boulon d'ancrage. Cette rondelle comporte une partie pliée et percée pour recevoir l'extrémité d'un câble participant au renforcement du toit de galerie.

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