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Lally column

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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 .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}6.4 millimeters (1⁄4 in) in thickness; today, that has been reduced in instances to 1.5 millimeters (0.06 in). As engineered structural load-bearing components, Lally columns must be installed to their specific design specs.