Bridge over rail lines with access ramps and stairs down to platforms. Walk through lattice truss structure with SHS members and aluminium panel balustrades.
Key Features:
- Main truss span.
- An Access ramp and stairs from 'The Base' to the main bridge span.
- Walk through lattice framed truss from bridge to platforms, with precast stairs inside (two off).
- Lift shafts with glazing and decorative panels (three off).
- Large SHS struts and braces welded into lattice trusses to form a walk-through bridge.
- Aluminum panels, with laser cut design, between braces to form balustrades.
Challenges:
- Architectural design and structural design were both 2D. Complexities of detailed coordination could only be achieved with the PFS 3D Model. PFS built the bridge to this 3D model and the new NZS5131 code.
- Detailed design using solid works 3D model to coordinate all truces with platforms and foundations.
- The complex process of attaching aluminium panels to a carbon subframe faced challenges due to the dissimilar materials and thousands of fixings. PFS addressed this by redesigning the subframe, using aluminium square sections (SHS) with panels riveted directly to them. An artistic design was cut into all panels to ensure that once fitted between SHS braces it read as a single design over the length of the bridge.
- The original design had a bolt in the top lattice truss so precast deck panels could be lifted on-site from above. This added complexity to fabrication transport and erection. PFS solved this by providing a fully welded structure and permanent deck formwork so the panels could be cast in situ.
- Large crane lifts over rail lines during a block of line.
- Tight programme set around new train connection from Auckland to Hamilton.
