Bridges & Structures
In total, 19 bridges will be built to extend the NPBH over the Serpentine River, Nambeelup Brook, Murray River/Pinjarra Road, South Yunderup Road, Murray River floodplain, Harvey River and a number of Water Corporation drains.
The Murray River Bridge is the largest of these spanning some 272 metres over both Pinjarra Road and the Murray River.
The bridges over the Murray River and Serpentine River are being constructed using an incremental launch technique, where the deck is cast behind the abutment as a series of sections that are stressed together and then launched forward until the deck is complete.
Click here to view an incremental launch of the Serpentine River Bridge.
The remaining bridges are being constructed using precast concrete beams which are being fabricated off-site.
Quick facts on our major bridges:
|
Serpentine River Bridge |
Murray River Bridge |
South Yunderup Bridge |
Harvey River Bridge |
Length |
112 metres |
272 metres |
222 metres |
60 & 56 metres |
Number of spans |
3 |
6 |
7 |
2 |
Length of each span |
39 metres |
46 metres |
33 metres |
32 metres |
Number of piles for foundation |
68 |
164 |
254 |
96 |
Length of piles driven into the ground |
Up to 18 metres |
Up to 21 metres |
Up to 20 metres |
Up to 24 metres |
Type of piles |
Steel tubular 762 millimetres in diameter filled to full height with reinforced concrete |
Steel tubular 762 millimetres in diameter filled to full height with reinforced concrete |
350 millimetre square precast concrete |
350 millimetre square precast concrete |
Number of segments launched incrementally |
7 |
18 |
NA |
NA |
Click here if you would more information about the Murray and Serpentine River Bridges.
In addition to the bridges, the project will also see the construction of five pedestrian underpasses at Safety Bay Road, Karnup Road and Paganoni Road, Lakes Road and Pinjarra Road interchanges to provide access for pedestrians and cyclists.
Fauna underpasses will be constructed throughout the project length to provide safe and secure passage for fauna and protect road users from potential conflict. The number and location of these is currently being determined in consultation with the Department of Environment and Conservation.