A Lally column is a round or square thin-walled structural steel column filled with concrete, and oriented vertically to provide support to beams or timbers stretching over long spans. Historically, Lally columns were made of steel up to 6.4 millimeters (1⁄4 in) in thickness; today, that has been reduced in instances to 1.5 millimeters (0.06 in).
A Lally column is a round or square thin-walled structural steel column filled with concrete, and oriented vertically to provide support to beams or timbers stretching over long spans. Historically, Lally columns were made of steel up to 6.4 millimeters (1⁄4 in) in thickness; today, that has been reduced in instances to 1.5 millimeters (0.06 in).
Source: Wikipedia "Lally column" · CC BY-SA 4.0
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