Graphical Construction Glossary >> Temporary Work. >> shoring >> Needle Beam

Needle Beam
In underpinning. A cast in-situ concrete beam, usually sat on piles or concrete piers that passes through and supports a wall, or a foundation.

a concrete needle beam

Note! The above sketch is an indication only and the piers would be deeper and the rebar is a brief indication only.

The beam gets it's name from the shoring technique of using needles to temporarily support a wall while opening are cut into it or it is otherwise repaired.

This type of underpinning has become viable these days since the introduction of small augers and mini-pile rigs that are so small as to be able to get access inside buildings.

Reinforced concrete piers or mini piles are used for the main support, and then concrete beams are cast on top of them through previously prepared holes in the walls.

This type of beam can be very effective crossing a corner at 45deg. (in plan).

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