US 4,123,031 AGranted

Improvements in concrete roadway-slab forming and form-elevation adjusting means

OwnerRobert W. Hyreinventor

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Abstract

Concrete-slab forming means and more particularly improvements in means for supporting and adjusting the elevation of the forms for concrete roadway slabs which bridge the space between spaced-apart pairs of in-place girders. The forming means per se comprises a preferably plywood deck or decking disposed at a predetermined elevation and which extends between the girder pairs and is laid directly on joists in turn supported on purlins, (preferably "split" or spaced-apart purlins), extending between said girders. The supporting means therefor which also must support the concrete deck load comprises a plurality of form supporting assemblies disposed at predetermined spacings from one another along the length of the girders of the pairs thereof, and which are so constructed as to be capable, by extending substantially vertically between the foot flanges of each two parallel girders and the ends of the purlins, of supporting and adjusting the elevation of said purlins, joists, plywood deck and and thereby of the concrete deck load.

Claims7

Dependent claims

In concrete roadway slab-forming and form-elevation adjusting means, wherein said means comprises generally planar decking adapted to extend between and to be disposed flush with the top-most horizontal surfaces of a spaced-apart in-place pair of girders provided with oppositely facing foot flanges, a plurality of longitudinally extending, spaced-apart joists on which said decking is lair, purlins extending transversely between upper portions of said girders providing support for said joists and decking, said purlins being supported adjacent their ends in upwardly opening U-members, a pair of adjustable length generally vertical rodform support members supporting said U-members and adapted to extend between said facing foot flanges of the girders and said U-members, and adjustable means extending transversely between and supporting the lower end-length portions of said rod-form support members and adapted to be forcefully held to said oppositely facing foot flanges, the improvement comprising said purlins being disposed in laterally spaced-apart pairs in said U-members, and each said rod-form support member extending upwardly into the space between the pairs of purlins and terminating in means enabling bodily adjustment of the elevation of said purlins, joists and decking from above said decking.

Dependencies are inferred from the claim text.