Telescopic pumpable prop assembly with improved ceiling impact properties

A method for filling a telescopic ceiling support prop, comprising:

• reconfiguring the prop from a retracted configuration to an extended configuration by filling the prop with pressurized air, wherein reconfiguring the prop involves an inner member moving telescopingly relative to an overlapping outer member while maintaining an air tight seal therebetween via an upwardly angled flange extending outwardly from the inner member to the outer member, the prop continuing to be extended until the prop abuts a ceiling to be supported;
• filling the prop in the extended configuration with grout to a predetermined pressure by placing a pressure release valve arranged to operate at the predetermined pressure in fluid communication with an interior of said prop;
• and
• allowing the grout to set while maintaining the predetermined pressure to thereby apply pressure to the ceiling subsequent to the setting of the grout.

A grout fillable prop assembly comprising:

• an inner member and an outer member adapted for telescoping movement between a retracted configuration and an extended configuration, the inner member and the outer member having overlapping wall portions that overlap each other, each said inner member and outer member being self-supporting;
• a peripheral sealing flange extending between overlapping wall portions of the inner member and the outer member, the peripheral sealing flange being an upwardly angled flange extending outwardly and upwardly from the inner member towards the outer member;
• a unidirectional grout inlet in an upper part of a sidewall of the outer member to allow grout to pass into the prop;
• an air conduit through the prop having an opening adjacent an upper limit of the prop;
• and
• a pressure relief valve coupled to the air conduit,
• whereby the prop is brought from the retracted configuration to the extended configuration by application of pressurized air through the air conduit and whereby the prop in the extended configuration is filled with grout via the unidirectional grout inlet.