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Riverslea Bridge

Rookwood Weir is a landmark project that will capture valuable water in the lower Fitzroy River for use across the region that will provide water security, boost the regional economy, create job during construction, grow and diversify industry and agriculture and allow for the buying and selling of water.

Description

Rookwood Weir is a landmark project that will capture valuable water in the lower Fitzroy River for use across the region that will provide water security, boost the regional economy, create job during construction, grow and diversify industry and agriculture and allow for the buying and selling of water.

The project comprises of two key components:

  1. constructing the weir; and
  2. enabling works that will upgrade existing infrastructure to support both the construction of the weir and its operation, which includes building a 21m high, 260m long bridge at Riverslea to replace the existing crossing and up to 1km of new road approaches.

CMC was engaged by Sunwater for the construction of the Riverslea bridge over the Fitzroy River which is approximately 220m upstream of the existing low-level crossing. The new single lane, 8 span, 260m long super-tee girder bridge is over 21m high to allow for the afflux created by from the downstream Rookwood Weir upon its completion.

As a result, the new bridge provides both greater flood immunity and load carrying capacity for the community and associated agricultural industry in the area.

The bridge configuration consists of cast-in-place piles, pile caps, blade columns, headstocks, 35m long super-tee girders, bridge rails, expansion joints and abutment protection along with 1km of sealed road approaches.

The Fitzroy River has the largest river catchment flowing to the eastern coast of Australia. Accordingly, the risk of flooding during construction was a major consideration with various contingency plans developed by CMC should a flood event occur. As part of the flood risk mitigation strategy, CMC and Sunwater agreed that accelerating the works was warranted. CMC developed a plan and then executed the accelerated construction ensuring the bridge girders were erected prior to major river flows that subsequently occurred saving months of delays and significant costs in the process.

Major quantities include:

  • 23No. cast in place piles
  • 2,500m3 of concrete, including insitu deck, using long range concrete mixes
  • 560tonnes of reinforcing steel
  • 16No. prestressed concrete super T-Girders
  • 550m of supply, fabricated and erect bridge barrier rail
  • 250tonnes of heavy duty dense graded asphalt surfacing layer, AC [14] H mm mix
  • 50,000m2 of bridge site and approach road clearing and grubbing
  • 7,800m3 of earthworks excavation
  • 6,000m3 of earthworks embankment
  • 2,500m3 of unbound pavement
  • 11,750Litres of sprayed bituminous treatments
Riverslea Bridge
14M
Sunwater
April 2020 - March 2021

Riverslea Bridge

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