These corrugated metal structural plates with a 400 × 150 mm profile assemble into drainage and crossing structures: round closed culverts, arched radial, arched box and double-radius arch configurations. Plates come in useful lengths of 2125–3825 mm at a useful width of 1200 mm, with metal thickness from 4 to 8 mm; the 400 mm corrugation wavelength and 150 mm profile height give the assembled shell the stiffness to carry road and railway embankment loads.
Corrugated metal structures (CMS) have transformed culvert and small-bridge construction: bolted plate shells erect in days with light cranes, follow ground settlement without cracking, and replace cast-in-place concrete at a fraction of the cost and season-dependency. Sold from a single unit at 900 dollars, the plates address road construction contractors, railway builders and infrastructure suppliers.
Road programs consume culverts by the hundreds, making CMS plate supply a volume infrastructure business.
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