Snowy Hydro Limited has been delivering reliable and renewable energy to Australia for over 70 years. The Snowy hydro scheme is situated in Southern New South Wales and consists of nine power stations, 16 major dams and 145 kilometres of interconnected tunnels. To enable access and travel across the waterways, numerous bridges are present across the scheme. Snowy Hydro Limited identified that twenty bridges across the scheme require maintenance and remediation works.
MU Group was engaged to complete Level 2 bridge inspections for the twenty identified bridges in accordance with Transport for NSW requirements and procedure (RTA Bridge Inspection Procedure Manual, 2007). This involved MU Group completing condition ratings and identifying the required maintenance actions for each bridge.
For the bridge structures spanning dams, spillways and Intakes, our team utilised Unmanned Aerial Vehicles (Drones) to critically and effectively inspect bridge elements that were otherwise unable to be safely and closely viewed. The use of drones eliminated the need for the use of expensive specialised access equipment.
The major maintenance activities are planned to commence in October 2021 and will continue throughout the summer. From our inspections, these maintenance activities will include bearing replacements, repainting of steelwork (including removal of current lead-based paints where required), concrete crack repair, mortar pad repairs, replacement of corroded bolts and nuts, bridge approach pavement re-lay and general deck repairs and cleanouts.
Further Level 3 inspections and structural assessments are expected for some of the bridges, where further testing and analysis are required to confirm current load limits.