Constructed in 1961, the bridge over the Hastings River on Rawdon Island is an eight-span concrete structure with an overall length of 164 metres. A dive inspection in 2021 uncovered severe structural damage to the bridge piles. Duratec was engaged by Port Macquarie Hastings Council to carry out a level 3 inspection and it was on the back of this that Duratec was appointed to undertake the design and construction of the bridge repairs.
Scope of works
- Level 3 inspection and report on bridge to determine condition and gain a greater understanding of any active or potential concrete deterioration mechanisms
- Design of structural repairs to bridge piles and blade walls
- Design of cathodic protection system
- Construction of suspended scaffolding on bridge piers
- Strengthening of bridge piles using a temporary steel formwork system with micro-piles, reinforcing cage and underwater grout infill
- Installation of ICCP system and abutment scour protection
- Concrete repairs to headstock and blade walls
- Protective coating of concrete headstocks and blade walls
Highlights
- Early contractor involvement
- Design and construction of repairs
- Sensitive environmental conditions (microbat nest on bridge)
- Expedited planning and delivery of emergency repair works
