Concrete form using face sheet as tension flange for stiffeners

Abstract

Metal concrete form panels having a face sheet to which is attached a rearwardly extended perimeter flange. Stiffeners on the back side of the face panel are to the back side of the face sheet and are arranged so that pressure on the front of the face sheet induces a tensile force in the face sheet.

I claim:  
     
         1 . A metal concrete form panel, comprising: 
 (a) a face sheet;    (b) a flange extended rearwardly of the face sheet around the perimeter of the face sheet;    (c) a plurality of stiffeners extended between opposing portions of the flange and secured to the back of the face sheet; and    (d) the stiffeners are arranged around a central portion of the face sheet so that pressure on the front side of the face sheet induces a tensile force in the face sheet.    
     
     
         2 . A metal concrete form panel as defined in  claim 1  wherein said face sheet is rectangular.  
     
     
         3 . A metal concrete form panel as defined in  claim 2  wherein said face sheet is square.  
     
     
         4 . A metal concrete form panel as defined in  claim 1 , wherein said stiffeners include at least a first pair of generally parallel, spaced-apart stiffeners.  
     
     
         5 . A metal concrete form as defined in  claim 4 , wherein said stiffeners include at least a second pair of stiffeners transverse to the first pair of stiffeners.  
     
     
         6 . A metal concrete form panel as defined in claim I wherein the cross section of the face sheet resists deflection substantially equally with the cross section of the ribs.  
     
     
         7 . A metal concrete form panel, comprising: 
 (a) a rectangular face sheet;    (b) a flange extended rearwardly of the face sheet around the perimeter of the face sheet;    (c) at least two spaced apart stiffeners transverse to a first pair of opposing sections of the flange and having opposite end portions secured to corresponding opposing sections of the flange;    (d) at least two spaced apart stiffeners transverse to a second pair of opposing sections of the flange and having opposite end portions secured to corresponding opposing sections of the flange; and    (e) the stiffeners are arranged around a central portion of the face sheet so that pressure on the front side of the face sheet induces a tensile force in the face sheet.