Moorabool Viaduct Bearing Maintenance
Sterling delivered comprehensive bearing maintenance and concrete pedestal repairs across 40 bearing locations on the Moorabool Viaduct in Western Victoria. Works completed included bearing cleaning, lubrication and protective coating, various concrete repairs, and installation of new vertical restraint plates.
Challenge
The Moorabool Viaduct's bearing arrangements exhibited typical life cycle deterioration requiring remediation across all 40 bearing locations on the heritage bluestone structure. Works completed included bearing cleaning and lubrication, concrete spalling repairs on 16 bearing pedestals and two pedestals requiring complete refurbishment. Additional vertical restraint systems were added to each the bearing structure to improve system performance. Works required careful coordination to address lead-safe working requirements.
Solution
Sterling implemented a phased methodology beginning with cleaning and lubrication of all 40 bearings between sole and bed plates. Protective paint coating using Dulux Luxepoxy barrier coat was applied at all fixed and expansion bearing locations. Concrete repairs utilised FOSROC Renderoc HB70 grout with epoxy-coated reinforcement, formwork installation matching existing pedestal profiles including chamfers. Vertical restraint plates were installed using M20 threaded rod chemset into 300mm deep, 30mm diameter cores using Hilti RE-500 epoxy, positioned to not restrict bearing movement.
Deliverables
Complete bearing maintenance across 40 locations including cleaning, lubrication and protective coating. Concrete repairs to 16 bearing pedestals with spalling remediation and reinforcement treatment. Full reconstruction of pedestals. Installation of 10mm thick steel restraint plates on all 40 bearing pedestals. Removal of old fall arrest cable and debris clearance from 9 bluestone pier platforms and abutments.
Outcome
The maintenance program addressed progressive bearing deterioration and restored structural integrity to concrete pedestals across the viaduct. Installation of vertical restraint plates improved structural resilience at all 40 bearing locations. Works were programmed across approximately 20 shifts with concurrent activities to minimise network impact on ARTC's Victorian interstate corridor.
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