Article source: Stamos Yeoh Architects
We’ve recently completed a co-working office development project in Stratford, London for our client us&co which features what we think to be a unique one-off helical pre-cast concrete staircase. The stairs travel from ground to first floor level, involves 20 reinforced concrete treads, each one cast individually from a bespoke fibreglass mould, and then laid above each other.
In order to support the staircase during construction, each tread was propped up with timber formwork, and as the stairs went up, three tensile steel cables were fed through each tread, all the way from base to top, and thereafter tied to steel structure at the very top & bottom and then post – tensioned (tightened up) in order to pull all the treads together. Then the formwork was removed and the stairs remain self-supporting.
Image Courtesy © Marek Sikora
- Architects: Stamos Yeoh Architects
- Project: Co working offices
- Location: London
- Photography: Marek Sikora
- Building levels: 6
- Lead Designer: Stamos Yeoh Architects
- M&E Engineer: Tate Consulting
- Structural Engineer: Walsh Structural Engineers
- Main Contractor: John Cirmaci Builders
- Project size: 4500 m2
- Completion date: 2020
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