Lachlan’s Line Pedestrian Bridge

Landcom envisaged an iconic pedestrian bridge design to strikingly mark and define the public realm identity of the new Lachlan’s Line development for the community, and create a unique and engaging user experience. The brief was to create a iconic and functional landmark, an inspired sculpture in the landscape to align and optimise aspirations for the new Lachlan's Line development as well as deliver long clear spans to future proof surrounding road network expansion. The brief sort to provide a strong visual and functional link to connect the Lachlan's Line development to new public transport and encourage active transport.

This bridge is an inspired sculpture in the landscape; enriching the urban domain with its unique form. The unique helix design is grounded in geometrical and structural efficiency, creating a highly legible form and shape that expresses its function with clarity and distinction. This bridge across two major roads facilitates safe pedestrian and cycle access to public transport and commercial and recreational areas. The bridge weighs 335 tonnes, an overall length of 170 metres, maximum unsupported span of 70m, and consists 3,657 individual components. The quality of this striking bridge reflects the collaboration, experience and expertise of our proud team.

This bridge is critical to providing safe pedestrian and cycle access for the Lachlan's Line community to public transport and the existing cycle networks. Positive environmental impacts are integral with groundbreaking project specific software used to manage the design, with the number of elements reduced to optimise geometry and performance, alignment optimised to create the shortest bridge possible and the structure and the structural analysis of each element optimised to minimise steel tonnage and reduce embodied energy, including varying thickness of steel plates throughout the structure. The use of stainless steel for the deck and accessible connections minimise maintenance.

New rolling techniques were developed to create the helix truss warped steel surfaces to ensure specified tolerances. The variable diameter helix-shape formed four fabricated box sections is a world first, supporting installation in this difficult location.