Bridge 28 on the Midland line is a 166m long bridge and various components have deteriorated over time. Replacement of the rail beams was necessary to reduce the risk of line closure due to failure.
Vitruvius played a multi-disciplinary role. We led the Project Delivery and delivered the technical survey and track alignment design.
The Bridge 28 structure has been designed with eight rail beam spans – three of which were designed to flex under load. All new rail beams were delivered on site as two pieces each which gave the contractor the ability to swap out the old wooden rail beams one side at a time. This allowed rail beams to be replaced between scheduled services on the Midland line, resulting in minimal disruption to core services.
Through coordination across multi-disciplinary scope and phases, our rail and design expertise allowed us to take a holistic view of this project to best meet the client’s objectives around cost, construction and quality.
Project: Midland Line Bridge 28 ‘Sloven Creek’ between Staircase and Craigieburn, South Island
Vitruvius Scope: Digital Engineering, Rail Infrastructure, Surveying Services