Abstract: A machine for forming corrugated plate from a flat sheet defined by a plurality of serially arranged corrugating stands. At least one stand has cooperating corrugating rolls defined by a plurality of disc shaped dies which, during corrugating, are rotated at differing rates so that the peripheral speed at a selected diameter, of each such disc substantially equals the linear speed of the plate being corrugated. The discs can be constructed of disc shaped die halves, the axial position of which can be varied so as to vary the corrugation pitch or the profile while maintaining the pitch constant. Drives for the corrugating rolls and, in particular, for the disc dies can power rotate all dies or only some of them while others are free wheeling.

Abstract: A modular bridge system constructed of parallel, side-by-side bridge modules constructed of components made from large pitch and depth corrugated plate. Each module has an upper chord plate, which ultimately defines the corresponding part of the bridge deck, a spaced apart, parallel lower chord plate and an intermediate, sinusoidal support structure defined by webs which have a width substantially equal to the width of the chord plates so as to define a continuous lateral support for the upper chord plates at intermediate points over the length thereof. Load distributing ribs secured to the underside of the chord plates only are placed at unsupported portions of the upper chord plates between attachment points for the webs and have a width substantially equal to the combined width of all modules to tie the modules to each other and to distribute vehicular (point) loads over a relatively wide lateral extent of the chord plates.