Floor tile with adhesively joined concrete sub-blocks

1. 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.

2. A raised floor arrangement according to claim 1 , wherein said main concrete block has a bottom surface engaged with and adhesively fixedly secured to the bottom wall of said support pan.

3. A raised floor system according to claim 1 , wherein the preformed main concrete block is formed from at least two substantially identical preformed concrete sub-blocks which have a generally rectangular configuration in plan view.

4. A raised floor system according to claim 1 , wherein the preformed main concrete block is formed from three substantially identical preformed concrete sub-blocks which have rectangular profiles in plan view and which are all disposed in generally parallel side-by-side relationship and are adhesively fixedly joined at abutting edge walls to define the preformed main concrete block.

5. A raised floor system according to claim 1 , wherein corners of the side wall structure of said pan are slit vertically downwardly from said top edges, and wherein said upright side walls are cantilevered upwardly and are angularly deflected into engagement with edge walls of the preformed main concrete block.

6. A raised floor system according to claim 1 , wherein the upright side walls of the pan, at the top edges thereof, are provided with a reversely bent edge flange which is positioned exteriorly of the respective side wall and projects downwardly from the respective top edge.

7. A raised floor system according to claim 6 , wherein the preformed main concrete block is formed from at least two substantially identical preformed concrete sub-blocks which have a generally rectangular configuration in plan view.

8. 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;

wherein corners of the side wall structure of said pan are slit vertically downwardly from said top edges, and wherein said upright side walls are cantilevered upwardly and are angularly deflected into engagement with edge walls of the main preformed concrete block;

said main preformed block being positioned within said compartment and fixedly adhered to said support pan, said main concrete block having a bottom surface engaged with and adhesively fixedly secured to the bottom wall of said support pan, said main concrete block also having edge walls thereof engaged with inner surfaces of said support pan side walls; 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 main preformed concrete block, and the side walls being adhesively fixedly secured to the edge walls at the engagement therebetween.

9. A raised floor system according to claim 8 , wherein the upright side walls of the pan, at the top edges thereof, are provided with a reversely bent edge flange which is positioned exteriorly of the respective side wall and projects downwardly from the respective top edge.

10. 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 one-piece preformed concrete block being positioned within said compartment and fixedly adhered to said support pan, said main concrete block having a bottom surface engaged with and adhesively fixedly secured to the bottom wall of said support pan; and

the upright side walls of the pan being preformed so that at least upper portions of the side walls protrude inwardly and create a resilient engagement with the edge walls of the main preformed concrete block when the main concrete block is positioned within the compartment, the side walls being adhesively fixedly secured to the edge walls at the engagement therebetween.

11. A raised floor system according to claim 10 , wherein the upright side walls of the pan, at the top edges thereof, are provided with a reversely bent edge flange which is positioned exteriorly of the respective side wall and projects downwardly from the respective top edge to define a downwardly directed groove to permit gripping and outward deflecting of the side wall to facilitate positioning of the concrete block within the compartment.

12. A raised floor system according to claim 10 , wherein corners of the side wall structure of said pan are slit vertically downwardly from said top edges, and wherein said upright side walls are cantilevered upwardly and are angularly deflected into engagement with edge walls of the main preformed concrete block.

13. 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 preformed from thin metal sheet and 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, the bottom and side walls of the pan being free of protrusions or the like which project into said compartment;

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 one-piece preformed concrete block having a height which at least substantially equals or slightly exceeds the height of the shallow compartment;

said main one-piece preformed concrete block being formed by a predetermined plurality of preformed one-piece rigid concrete sub-blocks each having a thickness corresponding to the thickness of the main concrete block, said predetermined plurality of concrete sub-blocks being positioned in sidewardly adjacent relationship with opposed edge walls which are surface-finished to provide surface uniformity and flatness, the opposed surface-finished edge walls being fixedly and rigidly joined in snug abutting contact by an adhesive applied to said contacting edge walls so as to create said main one-piece preformed concrete block prior to its disposition into the pan; and

said main one-piece preformed concrete block being positioned within said compartment and fixedly adhesively adhered to said support pan, said main one-piece concrete block having a bottom surface engaged with and adhesively fixedly secured to the bottom wall of said support pan, and having edge walls engaged and adhesively fixedly adhered to inner surfaces of said support pan side walls.

14. A raised floor system according to claim 13 , wherein the preformed one-piece main concrete block is entirely formed by a predetermined plurality of substantially identical preformed concrete sub-blocks which have a generally rectangular configuration in plan view.

15. A raised floor system according to claim 14 , wherein the preformed main concrete block is formed from three substantially identical preformed concrete sub-blocks which have rectangular profiles in plan view and which are all disposed in generally parallel side-by-side relationship and are adhesively fixedly joined at abutting surface-finished edge walls to define the preformed main concrete block.

16. A raised floor system according to claim 13 , wherein said upright side walls are cantilevered upwardly and are resiliently deflected for engagement with edge walls of the main one-piece preformed concrete block, and wherein the side walls are adhesively fixedly secured to the edge walls at the engagement therebetween.

17. A raised floor system according to claim 13 , wherein the main one-piece preformed concrete block has an upward-facing top surface which is surface finished to provide a smooth flat surface to function as the exposed top surface of the floor tile.