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 2107826

A passive-type mine roof bolt is constructed of multi-strand steel cable. The bolt head is constructed of a hexagonal- or other drive-headed collar having an internally tapered funnel-shaped bore therethrough, and a tapered plug having a frusto-conical outer surface that engages the funnel-shaped 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 steel cable, the hexagonal head drive collar fitting over the tapered plug such that pressing the tapered plug and steel cable into the inner funnel-shaped 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 rigid 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. A number of alternative embodiments enhance the bolt's retention strength in the bore hole to aid in stabilizing the rock formation.

Cette invention concerne un boulon d'ancrage de type passif pour toit de mine, réalisé à partir d'un câble d'acier multitorons. La tête du boulon se compose d'un manchon hexagonal ou d'autre forme dont l'alésage est en forme d'entonnoir et d'un bouchon tronconique qui s'ajuste dans cet alésage en forme d'entonnoir. Le bouchon tronconique comporte un alésage sensiblement centré et adapté pour recevoir le câble d'acier. Le manchon hexagonal se glisse sur le bouchon tronconique dont l'insertion à force plus avant dans l'alésage en forme d'entonnoir du manchon a pour effet de faire mordre les cannelures intérieures du bouchon dans le câble d'acier, ce qui donne une tête de boulon hexagonale solidement assemblée. Le bouchon se compose en fait d'une paire de demi-cônes tronqués qui se pressent plus facilement l'un contre l'autre pour mordre dans le câble d'acier multitorons. Un certain nombre de variantes de l'invention se caractérisent par une force d'accrochage supérieure dans le trou de mine pour mieux consolider la formation rocheuse.

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