Telescopic Pumpable Props
AssigneeCougar Can Company Pty Ltd.
InventorsCraig Douglas Barnett, Phillip Martin Pike
Life of this patent
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Abstract
A single use grout fillable telescopic mine prop has self-supporting walls with plastic properties to withstand a much greater vertical displacement before failure. The prop has a unique installation fitting and a unique grout filling tool is provided to enable the prop to be quickly and safely filled. The prop is easy to maneuver into place by two workers as the design of the prop is lightweight. The prop has superior load withstanding properties and other properties to pumpable crib bags and grout filled steel props.
Claims16
A grout fillable prop comprising an inner member and an outer member adapted for movement between an extended use position and a retracted position, a grout inlet in an upper part of a sidewall of the outer member to allow grout to pass into the prop, the inner member and the outer member having wall portions with plastic properties and being self-supporting.
A grout fillable prop comprising an inner member and an outer member adapted for movement between an extended use position and a retracted position, a grout inlet in an upper part of a sidewall of the outer member to allow grout to pass into the prop, the inner member and the outer member having wall portions with plastic properties and being self-supporting, an installation fitting fitted to the grout inlet and adapted to hold a grout filling tool without the use of separate fasteners, the installation fitting having a guide adapted to capture a coupling on the tool and an opening adapted to accommodate a key on the tool, the installation fitting enabling the tool to be lifted into and out of engagement with the fitting, and a grout filling tool having an elongate pipe portion having a lower end adapted to connect to a grout hose and an upper end containing a coupling which has an outwardly extending flange adapted to be captured by the guide on the installation fitting and a depending key adapted to pass through the opening in the installation fitting, wherein the tool is adapted to be lowered into engagement with the installation fitting to enable grout to be pumped into the prop and is adapted to be lifted out of engagement with the installation fitting after the prop is filled with grout.
A grout filling tool for pumping grout into a grout fillable prop comprising an inner member and an outer member adapted for movement between an extended use position and a retracted position a grout inlet in an upper part of a sidewall of the outer member to allow grout to pass into the prop the inner member and the outer member having wall portions with plastic properties and being self-supporting, the grout filling tool having an elongate pipe portion having a lower end adapted to connect to a grout hose and an upper end containing a coupling which has an outwardly extending flange and a depending key, the tool adapted to be lowered into engagement with an installation fitting on the grout inlet to enable grout to be pumped into the prop and adapted to be lifted out of engagement with the installation fitting after the prop is filled with grout.
Dependencies are inferred from the claim text.