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This paper describes the inspection of a derelict riveted wrought iron swivel bridge, designed by Brunel in 1849, by a team of volunteers that is hoping now to restore the bridge to working order. This inspection, dimensional survey and limited ground investigation supplemented some original drawings, recorded the existing condition and produced ‘as found’ drawings and a condition report of the bridge. Wrought iron ties were found to have been used to ‘prestress’ the main edge beams to reduce cantilever deflections. The paper also describes some of challenges for the restoration of this bridge including: repairs to the ironwork; possible local strengthening; providing enhanced corrosion resistance for the iron within the closed sections; and, ensuring that the structure works as designed.

Brunel’s Swivel Bridge, Bristol, inspection, survey and renovation