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US 4,027,846 AGranted
Panel for casting concrete
AssigneeSociete Les Coffrages Madernes
InventorSylvain Caplat
Life of this patent
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Abstract
A panel for casting concrete comprising a front casting plate having a flat front surface constituting a support surface for cast concrete and a rear plate spaced from the front plate. A layer of expanded plastic foam material such as polyurethane foam of high density is cast, in situ, between the plates and effects joinder of the plates with the foam layer to form an assembled panel which behaves as a beam and has high resistance to bending and shear stresses.
Claims7
A panel for casting concrete comprising
- a front casting wall of steel sheet,
- a rear wall of steel sheet, said front casting wall facing said rear wall and being spaced therefrom, and
- a layer of expanded rigid polyurethane foam of high density cast in situ between said walls and joining said walls together, the mechanical properties of the cast foam being such that the panel behaves under the load of the concrete as a beam, said mechanical properties being such that:
- the polyurethane layer has a sufficient rigidity to prevent relative displacement of said two walls and to resist the shear-tensile forces and as a consequence has a density of at least 200kg/m.sup.3 ;
- said front casting wall has a thickness of at least 2.5mm for resisting the tensile forces applied thereto by bending of the panel,
- said rear wall has a thickness of at least 2.5mm for resisting the compression forces applied thereto by bending of the panel,
- the adherence of the polyurethane layer with the walls being sufficient to resist the shear-tensile forces and being obtained solely due to the properties of adherence of the polyurethane after polymerization in situ between the two walls.
4 more elements
Dependencies are inferred from the claim text.