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Structural Steel Design

Cheal was commissioned by Euroscaffold Ltd to undertake Structural Design for a soffit formwork support scaffold structure. The scaffold was to support the construction of the Turbine and Generator building of the Nga Awa Purua Geothermal Power Station near Taupo.

Cheal provided professional advice, checked compliance of the installation against NZ standards and issued producer statements prior to use.

Based on the Layher modular scaffolding system, the structures were 14m high, sitting on a basement slab located 6m below ground level. In addition to the soffit support were external cantilever working platforms and two internal full scaffold access structures.

The scaffolding was designed to carry the dead weight of all materials – concrete, formwork, reinforcement, self-weight and impact loads from pouring concrete. The total load to be supported was approximately 750 tonnes of wet concrete. To cater for the high and real forces it was important to realise the best performance from the scaffolding structures, something that depended on being able to maintain members in a vertical and straight form at all times.