Horsey Swamp 24×4.8m Bridge (Snowy Mountains, NSW)

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Click to download the Full Case Study.

 

Snowy Monaro Regional Council’s Horsey Swamp bridge replacement project: delivering a 24m dual span bridge for under $470,000 in 65 working days from design to open for traffic.

In order to replace aged timber bridges in the Bombala region, Council had successfully secured Stronger Communities Funds. Horsey Swamp was the last of the bridges to be replaced as part of this project, and it had the longest span.

This project was primarily delivered by Council, who also engaged local sub-contractors for project components like plant hire, labour and materials as required, thereby keeping funds and work in the local community.

Snowy Monaro Regional Council selected the InQuik system after a tender process. InQuik wasn’t the lowest upfront cost option, but it had the following key benefits

  • Pre-engineered modular design ensuring the tight project timeline was achievable.
  • Quality assured fabrication and anticipated reduced “whole of life” costs for this remote site.
  • The InQuik 2 stage “place and pour” process only took 2-3 days over a 2-week period in the project timeline.
  • Existing abutments could be left in place, and the new InQuik abutments built behind them, reducing demolition work and minimising environmental impact.

About

The Snowy Monaro region covers 15,162 km2 with ten major urban areas, surrounded by rolling plains country and mountain ranges. The region is home to 20,707 people and reflects a degree of cultural diversity that has its roots in agriculture, early gold mining, the Snowy Mountains Scheme, timber logging and skiing industries.

Challenge

Forestry is one of the largest industries in this region, and fully laden log trucks frequently travel the roads around Bombala. Tantawangalo Mountain Road, where the Horsey Swamp Bridge was built, is one of these frequently used roads between the Dongwha Sawmill and the Tantawangalo State Forest. This meant that the bridge needed to be designed for these heavy log movement periods, so it was critical that the bridge fully met the latest AS5100 code and SM1600 load rating.

Council led the construction process to ensure delivery of the new infrastructure within resource and project timeline limitations, while ensuring that the bridge meets the on-going needs of the community and visitors.

The 4 key reasons for selecting InQuik for this project were:

1) The timely and efficient 2 stage “place and pour” installation process
2) Minimal impact on the environment as Council kept the old abutments in place and installed the new InQuik abutments behind them
3) Cost-effective premium solution designed to AS5100 (2017) bridge code
4) Minimal maintenance costs over the 100 year “whole of life” asset plan.

 

How We Helped

The InQuik system was selected as it met all the key criteria, and ensured that the timeline for design and construction could be met. Having installed an InQuik bridge previously for the Merima project, Council was satisfied that the project timeline could be met.

The InQuik solution would help to shorten the window on road closures, minimise the impact of weather delays, and deliver a new asset with minimal long-term maintenance costs.

Results

The new Horsey Swamp Bridge has a 24m dual span design, and is 4.8m wide (for a single traffic lane). The integral design provides an incredibly robust, low-maintenance structure that will provide safer, reliable access for the local community for at least the next century.

Council managed the replacement, utilising their experienced employees and engaging local sub- contractors for some components and materials. This enabled them to deliver the whole project for  just over $3,000 per m2 for the complete works – including the approach roads, a temporary side track during construction, the InQuik bridge components and piles/foundations.

The Horsey Swamp bridge road approaches have been improved, as well as signage and barriers. With a SM1600 (160 tonne) load rating, it supports three of the regions core economic drivers: agriculture, timber and tourism.

The community and Council has welcomed the completed project delivered ahead of time and well within budget.

“Snowy Monaro Regional Council was happy with the user friendly, efficient installation process of the InQuik system” – Construction Supervisor at Snowy Monaro Council.

Key Project Points

  • Delivered an asset that is compliant with the most recent AS5100 (2017) bridge code and ensures reduced whole-of-life costs during the 100-year design life.
  • The efficient 2-step “place and pour” installation minimised environmental impact.
  • The rapid bridge structure installation process reduced exposure and risks associated with weather delays.
  • Mitigated safety and WHS risks due to lightweight components, top-down installation and reduced site time.
Location:
Snowy Mountains, NSW
Client:
Snowy Monaro Regional Council
Span and Width:
24m x 4.8m
Start Date:
End Date: