Prop preloading apparatus

Details Prop preloading apparatus Prop preloading apparatus

1991-06-26

1992-09-22

Ramirez, Ramon O.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

248357, E21D 1532

Patent

active

051492288

ABSTRACT:
The prop preloading apparatus comprises a frame and means for supporting the frame on an end of an elongate prop in a manner permitting at least limited swivelling movement of the frame relative to the prop about at least one axis transverse to the axis of the prop. The apparatus also includes a flexible preload bag which is inflatable with a settable substance and which is dimensioned to be supported by the frame.

REFERENCES:
patent: 3703269 (1972-11-01), Meriz
patent: 4004771 (1977-01-01), Plevak et al.
patent: 4120164 (1978-10-01), Tomlin
patent: 4255071 (1981-03-01), Koppers et al.
patent: 4773792 (1988-09-01), Landers
patent: 5054964 (1991-10-01), Salzmann et al.

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