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Explore the construction of Ness Bridge with an overall length of 176m and innovative methods used like temporary works, steel girders, and concrete deck. Learn about the challenges faced during installation and the completion in October 2017.
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2049 – Inverness West Link Ness Bridge Construction
Ness Bridge in numbers: Overall length 176m (53m + 70m +53m) 4 supports – 2 abutments + 2 in-river piers Composite superstructure – 6 steel girders with concrete deck Steel beam height – variable 1.8 - 3.5m 3750m3 of concrete 1100t of structural steel 590t of rebar 28no. of bridge bearings Works Completion Date – October 2017
Ness Bridge – Temporary Works 2 working platforms – artificial islands in the river 2000 no. dumpy bags 6000t temporary fill 3 temporary bailey bridges – 12m, 15.5m, 22.5m 2 cofferdams – 12m & 15m deep 800m3 concrete to plug the excavation in cofferdams
Ness Bridge – Challenges Tight works programme for in-river works – 3.5 months only Variable and dynamically changing river flow values Extraordinary water surge from SSE Hydropower Plant Protection to environment during in-river works Maintenance of access to the river for third party users: anglers, kayakers, canoeists, walkers Invasive species mitigation measures in works area Superstructure installation
Ness Bridge – Superstructure Assembly and Installation Assembly on the ground – 3 months Installation on supports – 2 weeks Connections – 2 months Installation – 9 pairs of steel beams to be lifted: 190t @ 54.5m radius 140t @ 85.5m radius
