Strongback (girder)

A strongback is a beam or girder which acts as a secondary support member to an existing structure. A strongback in a staircase is usually ordinary two-by dimensional lumber attached to the staircase stringers to stiffen the assembly. In shipbuilding, a strongback, known as a waler is oriented lengthwise along a ship to brace across several frames to keep the frames square and plumb.[1] In formwork strongbacks (typically vertical) reinforce typically horizontal walers to provide additional support against hydrostatic pressure during concrete pours.[2]

Some rockets like the Antares (rocket), the Falcon 9 and the Falcon Heavy use a strongback to restrain the rocket prior to launch.[3] This structure reclines several degrees away from the rocket to clear the launch, either at the moment of launch or in some case a few minutes before.

References

Webster, Fred Bibber; Bates, J. L.; Phillips, Stephen McKay; Haag, Alfred Henry (1920). Shipbuilding Cyclopedia: A Reference Book Covering Definitions of Shipbuilding Terms, Basic Design, Hull Specifications, Planning and Estimating, Ship's Rigging and Cargo Handling Gear, Tables of Displacement of Commodities, Arrangement and Working Drawings of Modern Vessels, and a Composite Catalog of Marine Equipment. Simmons-Boardman Publishing Company.
Hurd, Mary Krumboltz (2005). Formwork for Concrete. American Concrete Institute. ISBN 978-0-87031-177-2.
"A strongback provides connections to the SpaceX Falcon 9 rocket as final preparations for launch are completed in Florida". Google Arts & Culture. Retrieved 2023-09-04.

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[1] Webster, Fred Bibber; Bates, J. L.; Phillips, Stephen McKay; Haag, Alfred Henry (1920). Shipbuilding Cyclopedia: A Reference Book Covering Definitions of Shipbuilding Terms, Basic Design, Hull Specifications, Planning and Estimating, Ship's Rigging and Cargo Handling Gear, Tables of Displacement of Commodities, Arrangement and Working Drawings of Modern Vessels, and a Composite Catalog of Marine Equipment. Simmons-Boardman Publishing Company.

[2] Hurd, Mary Krumboltz (2005). Formwork for Concrete. American Concrete Institute. ISBN 978-0-87031-177-2.

[3] "A strongback provides connections to the SpaceX Falcon 9 rocket as final preparations for launch are completed in Florida". Google Arts & Culture. Retrieved 2023-09-04.