Roof bolt and cradle arrangement

Details Roof bolt and cradle arrangement Roof bolt and cradle arrangement

1980-09-22

1982-06-15

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Chemical

405260, E21D 2002

Patent

active

043348050

ABSTRACT:
A roof bolt having particular adaptability for use in a mine defined by soft shale formations utilizing an anchor tube and an inner seal tube made from a plastic resin, where the combination of the anchor tube, which may be selectively ribbed, with conventional grouting material affords optimum holding power in the bolt hole. Aside from the preceding, the roof bolt is generally standard in configuration and usage, including a bolt carrying a movable metal wedge which causes the outward spreading of the upper portion of the plastic anchor tube upon rotation of the bolt. The preceding may be used independently of or with a support system employing angled roof bolts which create, through tensioning, a cradling effect especially advantageous in the instance of a fragile mine roof condition.

REFERENCES:
patent: 2850937 (1958-09-01), Ralston
patent: 4091628 (1978-05-01), Kelley
patent: 4124983 (1978-11-01), Weatherby
patent: 4179861 (1979-12-01), Brown

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