Restoration of the Morell Bridge, Melbourne
Abstract from Concrete Institute of Australia Conference, Brisbane, Australia, 1995
Godson, I.B. and Van Grieken, A.
The Morell Bridge is a unique earth filled arch bridge, designed and built in 1899 by Sir John Monash’s (Monash University) company, Monash and Anderson. The structure exhibited sever concrete sealing, displacement of side walls, one deflected arch, together with widespread drainage problems and poor aesthetics.
The restoration involved the total investigation of the structure, including corrosion and structural analysis incorporating dynamic surveys. Significant corrosion was identified in the arch reinforcement over a large portion of the soffit.
The project utilised an unique Cathodic Protection System, with 12 anodes placed in the soil below the footpath, permanently protecting all arch reinforcement, minimising the extent of patched concrete which would weaken the arch. The side walls were stabilised and the drainage improved, and a protective coating restored the heritage structure to its former glory. The project was carried out while the bridge remained in operation, allowing constant pedestrian, vehicular and river traffic over a nine month period to completion in April 1994.