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needle beam[′nēd·əl ‚bēm]
A temporary member thrust under a building or a foundation for use in underpinning.
A steel beam used to support an existing structure while it is being repaired, or to provide support when moving a structure, or when removing a portion of the wall below the beam; usually installed by removing a section of the wall or area, and inserting it into position.
A crossbeam supporting a load; used in underpinning foundation walls; attached to columns at its ends, clear of the existing footing.