PROP PRELOADING APPARATUS

摘要

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 prelo ad bag which is inflatable with a settable substance and which is dimensioned to be supported by the frame.