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A previous edition of Explainer described how formwork — temporary moulds into which concrete is poured — can be "flown" by the tower crane to be reused for the construction of the next building storey. Though it's generally more expensive and complicated, an alternative and special type of formwork rises automatically with the help of hydraulics as the building progresses.
This self-climbing formwork is used for vertical concrete structures that have repetitive floor plates. The automatic climbing system envelopes the structure, containing not only the formwork, but usually additional working space and scaffolds for construction crews. In cases where a seamless wall structure is required, continuously rising gliding formwork can be used. As opposed to the intermittent climbing of most types of formwork, gliding formwork is defined by its uninterrupted climbing process.
In adverse weather conditions, construction crews utilizing fly forms on a building project may have to wait to hoist them until the tower crane can be safely operated. Because self-climbing formwork is driven by mechanical and hydraulic mechanisms and doesn't need a crane, work on shaping the walls and floor slabs can continue. Self-climbing formwork can be enclosed in perimeter safety screens to protect workers from the elements and pedestrians from falling debris. Developers will often decorate these screens with their branding or advertisements of the project.
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