111 Eagle Street Mullions

Case Study

111 Eagle Street Mullions

Industry

Commercial

Material

Mild Steel

Location

Brisbane City, Australia

Scope

54 Structural Mullions

Completed

February, 2009

The Brief

Fabricate and supply 54 structurally engineered and certified mullions for the ground floor foyer of 111 Eagle Street, Brisbane. The mullions run the foyer perimeter, carrying both the glazing and the load - structural and architectural in the same element. Average height of 16 metres each.

Over 6 kilometres of welding across the job, finished with zero defects. Multiple variations were built across the 54 mullions to suit the formwork and architectural requirements around the building, all fabricated to the same techniques and standards to keep the finished appearance uniform across the foyer.

Our Approach

At the core, each mullion was built around a structural-grade steel box section, skinned and wrapped in steel work to give the architectural form the foyer required. The structural box carried the load and the glass; the outer steel work delivered the finished appearance. Same fabrication techniques across every variation, so the line of the work read consistently around the foyer perimeter even where the geometry changed to suit the formwork.

Welding ran to over 6 kilometres in total across the 54 mullions, with zero defects across the job. On structural work of this height and load, with full architectural exposure on the finished face, weld quality wasn't a final check - it was the way the job was built from the first tack.

Coordination ran across stakeholders, engineers, coaters, installers, and logistics. Fabrication happened in our Banyo workshop over approximately five months, with each mullion going through intensive quality control measures and stakeholder inspections before it left the floor. Once accepted, each mullion was treated with an extensive wet spray coating system, inspected again, and then prepared for delivery.

Delivery was scheduled and time-specific to suit construction site requirements. With 54 mullions, each 16 metres tall, on a Brisbane CBD site, the program didn't allow for stockpiling - work was supplied to site in the sequence and timing the build called for, coordinated with the installers and the broader construction schedule.

Across approximately five months in Banyo, 54 structurally engineered mullions, 6 kilometres of welding, and zero defects: the foyer perimeter of 111 Eagle Street, supplied to programme and to spec.

Technical Specs

Run54 mullions
Height~16m average
Weld6km, zero defects

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