New Farm River Walk Swing Bridge
After extreme flooding in Brisbane, Australia saw the original New Farm floating walkway all but destroyed in 2011, Eadon were approached to provide technical assistance to the design team tasked with designing the replacement of this vital city centre link.
Key facts
Location
Brisbane, Australia
Client
Brisbane City Council
In Partnership with
Ove Arup Brisbane
The completion of the $72million project has seen a new and improved city icon emerge. The 900m long river path connects New Farm with Brisbane’s central business district and carries more than 3000 pedestrians and cyclists every single day.
The swing bridge, which features pedestrian and cycle lanes and also shaded viewing areas, has a rotating, opening span which rises to allow vessel access to the Brisbane River. The span which when rotated provides a 15 metre wide clearance allows access for residents with properties within the enclosure of the river walk to access their moorings.
Eadon Consulting produced the exemplar design of the mechanisms associated with the moving span, details which were closely adhered to by the main contractor appointed to build the bridge. It was important that Eadon Consulting’s engineers completed the work to onerous flood loading conditions which were provided by lead consultants Arup. In light of the problems caused by the severe flooding which lead to the work in the first instance, the bridge needed to incorporate reinforced elements capable of withstanding the forces associated with future floods. In addition to the high forces anticipated, the operating equipment also had to be capable of surviving total submergence during extreme flood events with only minimal maintenance following the water level subsiding.
The bridge is rotated by a pair of horizontally orientated hydraulic cylinders. Each corner of the moving span is equipped with a jacking cylinder and locking pin mechanism. The jacking cylinder is used to remove the dead load deflections that occur when the deck is not supported at its ends (i.e. when rotating) and the locking pin mechanism consists of a large diameter pin which is pushed into place by another hydraulic cylinder. The power pack for the main drive, jacking and locking pin cylinders is located on the moving span.
After its successful completion New Farm River Walk was officially opened on 21stSeptember 2014.
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