Main Span: 100 m (328 ft), 130 m (426 ft), and 100 m (328 ft), supported by slender 100 m (328 ft) tall pylons.
Depth: 90 m (295 ft), with a 25 m (82 ft) wide dual carriageway 3-span extradosed concrete bridge.
A1-M1 Link Road Extradosed Bridge is a highway project of approximately 1 km (62 mi), currently under construction in Mauritius. The project will cross the Grand River Northwest Valley, a natural gorge with a depth of approximately 90 m (295 ft), with a 25 m (82 ft) wide dual carriageway 3-span extradosed concrete bridge with spans of 100 m (328 ft), 130 m (426 ft) and 100 m (328 ft), supported by slender 100 m (328 ft) tall pylons.
The deck is a single box girder, with a constant depth, cast in place by the typical balanced cantilever method and required the use of temporary stay cables to progress the cantilever construction towards the abutments. Being subjected to major cyclonic winds, a detailed wind climate study of the project site was conducted to derive wind buffeting loads for the bridge design both in construction and service.
When completed, the project will improve traffic within the network of A1 Road and M1 Motorway and provide alternative access to the city of Port Louis to traffic originating from Rose Hill, Beau Bassin, Chebel, Chapman Hill, and upper Coromandel. It is expected that this bridge will be the most aesthetic structure and become an important national landmark in Mauritius.
SYSTRA IBT’s scope of work involves detailed structural design, bar bending schedule and construction drawings, construction engineering and deflection control, drainage, and lightning protection.