Mine roof bolt

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E21D 20/00 (2006.01)

Patent

CA 2091662

An improved mine roof bolt is constructed of pre-tensioned, multi-strand steel cable. The bolt head is constructed of a hexagonal-or other drive-headed collar having an internally tapered frusto-conical bore therethrough, and a tapered plug having a frusto-conical outer surface that engages the frusto-conical inner surface of the drive collar. The tapered plug has an internal bore essentially concentric with the outer frusto-conical surface, and is adapted to fit over the multi-stranded steel cable, the hexagonal head drive collar fitting over the tapered plug such that pressing the tapered plug and steel cable into the inner frusto-conical bore of the hexagonal-head drive collar causes serrations on the internal bore of the tapered plug to be urged down against, and bite into, the steel cable, resulting in a solid hexagonal head for the cable bolt. The tapered plug is in actuality, a pair of essentially identical diametrically opposed semi-frusto-conical tapered sections that more easily compress together to bite into the multi-strand steel cable. The improved mine roof bolt is intended for use in passive-type mine roof systems.

L'objet de la présente invention est un boulon d'ancrage amélioré pour toit de mine, comportant un câble d'acier toronné prétensionné. La tête du boulon d'ancrage comporte un collet d'entraînement de forme hexagonale ou autre dont l'intérieur est traversé par un alésage frusto-conique logeant une cheville de profil extérieur frusto-conique en contact avec la surface interne frusto-conique du collet d'entraînement. La cheville conique présente un alésage interne essentiellement concentrique par rapport à la surface frusto-conique externe, et elle conçue pour épouser la forme du câble toronné; le collet d'entraînement hexagonal s'ajuste au-dessus de la cheville, de manière à comprimer la cheville contre le câble d'acier toronné. La cheville conique se compose de deux moitiés identiques de profil frusto-conique dont la compression sur le câble assure un assemblage offrant une haute résistance à l'arrachement. Le boulon d'ancrage amélioré est destiné à l'utilisation dans les systèmes de toits de mine de type passif.

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