Coulston and Spooners Bridges - Dungog

This project consisted of the design of two independent bridge structures for Dungog Shire Council.

Located on Patterson River Road between Gresford and Lostock in the Dungog Shire, both bridges were replacements of existing dilapidated timber structures designed to current Australian Standards. Northrop's bridge design team worked in a D&C partnership with Saunders Civilbuild, who undertook the construction works. 

Coulson bridge is a single lane, 65m long three span structure consisting of prestressed precast concrete spaced planks with an insitu concrete deck. The superstructure was a maximum of around 11m above the existing creek level and is subject to high flooding forced which resulted in complex lateral behaviour and significant uplift loads.

Spooners bridge is a single lane 62m long, four span structure consisting of prestressed precast concrete spaced planks with an insitu concrete deck. The superstructure was a maximum of around 9m above the existing creek level and is subject to high flooding forces which resulted in complex lateral behaviour and significant uplift loads. The flooding forces combined with the very high strength rock required anchorage of the structure using high strength stress bars to limit the costly socket length of the uplift friction piles

Northrop’s flooding team also undertook a flood study to determine the flow velocities and associated flood levels required for utilisation in the bridge design.

 

Client Name
Saunders Civilbuild, Dungog Shire Council

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