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Maintaining both the architectural integrity and the elliptical symmetry of the large cantilevered roof canopy was a critical task for the company contracted to supply, fabricate and erect the structural steel for 7 London Circuit.

Gian Callegaro of Universal Steel Constructions says the steel needed to be curved in two directions, similar to a velodrome roof, to create the desired effect.

"The horizontal louvre members, which are rolled rectangular hollow sections (RHS), are all positioned at a different point on the radius of the curve. This means every member has a different specification, which was determined by 3D computer modelling. The key challenge was to shape a non-pliable material into a two-way curve. It was also essential that the louvres be perfectly symmetrical."

Callegaro says a high-quality finish was essential. Consequently, all the roofing steel was hand painted on completion, with a micaceous iron oxide (MIO).

"This paint is too delicate to withstand the rigours of construction, hence the need to hand paint all the steel in situ."

Callegaro says special attention was also paid to the quality of the finish of the steel stairs in the atrium.

"These are significant architectural features, and while the fabrication wasn't difficult, we did ensure all the welding and the surface finish was of the highest standard to enhance the overall effect."

In the past 30 years Universal Steel has supplied, fabricated and erected the structural steel on numerous large commercial projects throughout Australia.

For more information, contact Universal Steel Constructions, 52 Newton Rd, Wetherill Park, NSW 2164, phone (02) 9756 2555, fax (02) 9756 4030.

Story by: Trendsideas