Floor structure

Abstract

A floor cassette assembly comprising: a structural bottom panel having an upper surface and a lower surface, a plurality of spaced apart upstanding rib members attached to the upper surface of said panel, wherein adjacent spaced apart rib members define a void between said adjacent rib members, and support means located intermediate adjacent spaced apart rib members, the support means configured to support particulate material within the voids defined by the respective adjacent rib members at a location that is vertically spaced from the structural bottom panel.

Dependencies are inferred from the claim text.