S H Structures Ltd
Derry City and Strabane District Council
This landmark cable-stayed bridge crossing the River Mourne provides a crucial missing link for pedestrians and cyclists between the residential areas and schools south of the river and Strabane centre to the north.
A key feature of the inclined and curved main pylon is a wishbone-shaped pair of Vierendeel trusses that stiffen the top of the arch in this zone of highly focussed loading.
The designed profile of the pylon legs was parabolic. This shape was approximated during fabrication by three constant radii, a discrepancy in geometry of less than 10mm, making fabrication of the pylon more efficient and cost-effective. Offsite fabrication produced a polished, precision-fabricated structure with the desired aesthetic qualities, as well as minimising site activities.
The installation of the mast required two large mobile cranes to safely carry out a critical and complex tandem lift.
This bridge provides a key link between the town centre and the residential and sports areas to the south. The cable-stayed bridge cleverly cantilevers from the south side, minimising the impact of foundations on the north end with its busy roads and critical infrastructure services.
A striking steelwork project.