A steel soldier for supporting concrete formwork comprises a pair of elongated steel elements connected back to back and parallel with one another by tie plates (3) at their ends and, if necessary, by diaphragms intermediate their ends. Each channel has a web (1) which, in order to increase its strength, is formed at longitudinally spaced intervals with flanged openings (1a). These openings characteristically according to the invention have peripheral flanges (1c) which are of channel-shaped radial profile, thereby increasing the shear carrying capacity and reducing the risk of cracking of the soldier under load.
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