(57) The invention discloses a method of forming gratings suitable for use as walkways
etc. The method includes the steps of forming transverse bearer bars (1) from strips
of flat plate by punching a series of transverse slots across the central axis of
each plate, then folding the plates to form U-sections with the slots located in the
apices of the U-sections. Longitudinal bars, which are lengths of flat bar, are then
inserted as tight press-fits into the slots, and the undersides of the longitudinal
bars are deformed laterally between the legs of each U-section to prevent their removal
from the slots. A strong lightweight grating results.
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