Project Description

The Wakefield Street Bridge Replacement project in Whanganui, New Zealand, is a critical infrastructure upgrade located on a busy rural road that crosses a key rail corridor. The existing bridge has reached the end of its design life, necessitating the construction of a modern replacement. The new bridge is being built over the live rail line, requiring careful planning and coordination to ensure minimal disruption to both road and rail traffic. This project aims to enhance safety and connectivity for the local community while accommodating future growth in the region’s transport network.

Project Challenges

One of the key challenges of the Wakefield Street Bridge Replacement project is the minimal rail clearance beneath the existing structure. The client expressed a preference to eliminate the current bridge’s piers, opting instead for a single-span structure to enhance safety and reduce maintenance. Additionally, there was a strong desire to minimise any alterations to the approach road profiles, further complicating the design process. These constraints required innovative engineering solutions to meet both the client’s specifications and the demands of the site.

Added Value

We utilised a digital engineering approach to optimise bridge geometry whilst maintaining rail clearances and minimising approach road changes. The resulting 35-meter steel composite system is now in the detailed design and documentation phase. We are also developing and documenting a viable construction methodology, designing new abutments, and delivering civil engineering services.