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LH Ford Bridge Rehabilitation, Dubbo, NSW

LH Ford Bridge Rehabilitation, Dubbo, NSW

NSW Government - Transport for NSW
Type: 
Construct
Location: 
Dubbo NSW
Australia
Consultant: 
BECA

Key Aspects

Freyssinet Australia was selected by TfNSW as the head contractor for the project. All quality, safety and environmental aspects of the project were managed by Freyssinet site team to conform to TfNSW requirements. Major subcontractors were engaged for piling operations over water (including barges) and erection of a suspended scaffold requiring detour of wide vehicles. 6 units of reinforced concrete piles approx. 21m below water level were installed and capped with precast concrete skirts. Reinforced concrete piers of 12m high were constructed using a climbing formwork/falsework system supported from cast-in elements of the first pour and braced off the piles. Temporary pier bracing were installed and bridge jacking was undertaken during a night road closure to correct the load. Live traffic was permitted on the bridge during the day for bearing installation works. External post tensioning tendons were installed using a total of 600m individually stressed stay cable strands enclosed in HDPE ducts and waxed anchorage boxes. 300 holes were drilled through the concrete webs and girders without damage to the existing steel reinforcement.
The LH Ford Bridge is a 613m long reinforced bridge and is the only current high-level bridge
in Dubbo, NSW that remained opened during a 1:100-year ARI flood event. Completed in
1969, the structure has experienced a high level of degradation in 50 years of service life
including 300mm sag of the drop-in span and significant vertical deflection due to live loads.
The project required the construction of 2 new piers in the Macquarie River to support the
main span underneath the halving joints. 16 units of bearings were installed to connect the
new piers to the existing concrete structure with fabricated steel shear keys providing lateral
load capacity. External post tensioning has been installed in the land spans and the drop-in
span to account for the modified bridge support locations and strengthen the bridge to allow
for the increased traffic loads.