Patent ID: 7770345

Claim:
In a raised floor arrangement including a plurality of upright pedestals positionable on a subfloor in a grid arrangement wherein the pedestals are disposed within transverse rows and columns, and a plurality of horizontally-oriented floor tiles supported on upper ends of the pedestals to define a generally horizontally oriented upwardly-facing raised floor, the improvement wherein said floor tile comprises: a generally box-shaped support pan defining therein a shallow upwardly-opening compartment, said support pan having a generally flat bottom wall which at peripheral edges joins to an upright side wall structure, said side wall structure including an upright side wall which extends lengthwise along each side of the bottom wall and protrudes upwardly and terminates at a top edge; a main one-piece preformed concrete block having a profile in plan view which generally corresponds to the plan view profile of the shallow compartment, said main block having a height which at least substantially equals or slightly exceeds the height of the shallow compartment; said main preformed block being defined by a predetermined plurality of preformed one-piece concrete sub-blocks each having a thickness corresponding to the thickness of the main concrete block, said sub-blocks being positioned in sidewardly adjacent relationship with opposed edge walls fixedly and rigidly joined in snug abutting contact by an adhesive applied to said contacting edge walls; said main preformed block being positioned within said compartment and fixedly adhesively adhered to said support pan; and the upright side walls of the pan being preformed to angle inwardly relative to the compartment as they project upwardly to create a resilient engagement with the edge walls of the preformed main concrete block, the side walls being adhesively fixedly secured to the edge walls at the engagement therebetween.