Lally column

A Lally column is a round or square thin-walled structural steel column filled with concrete,[1] and oriented vertically to provide support to beams or timbers stretching over long spans.

The steel shell of a Lally column is filled with concrete, which carries a share of the compression load, and helps prevent local buckling of the shell.

The advantage of a Lally column over a conventional structural steel is that it can be cut it to length on a construction site with simple hand tools such as a plumber's pipe cutter or a reciprocating saw.

Early Lally columns were made with structural steel, "standard" pipes, with wall thicknesses slightly less than 1/4".

Modern Lally columns are primarily intended as somewhat stronger and more durable substitutes for wood posts in light-frame wood construction, although they are sometimes also used with steel beams.