oa Civil Engineering = Siviele Ingenieurswese - Innovative structural steel tied arch footbridge : SAICE Awards 2007 - technical excellence



This project forms part of the prestigious development of the Knightsbridge complex at Century City. The structure provides pedestrian and golf cart access and carries services to Knightsbridge Island. Several challenges had to be innovatively overcome during design and construction. Not least of these involved the structural steel arches, which were to be constructed from a bent 457 mm tubular section. The final solution saw the tubular sections rolled and bent in Gauteng, transported to the DLE yard in sections where they were sandblasted, galvanised and welded. After this they were transported to site where they were erected adjacent to the bridge location before being moved into the final position. The structure incorporated existing piers, which had not been designed to withstand significant lateral load. This required the arch to be 'tied' so as not to induce lateral loads onto the pierheads.


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