2.7K 
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 storey above. 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 more often used for taller 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.
Have any other construction and development related terms that you would like to see featured on Explainer? Share your thoughts and questions in the comments section below!
* * *
From 2015 to 2017, UrbanToronto and its sister publication, SkyriseCities, ran an occasional series of articles under the heading Explainer. Each one took a concept from Urban Planning, Architecture, Construction, or other topics that often wind up in our publications, and presented an in depth look at it. It's time to revisit (and update where necessary) those articles for readers who are unfamiliar with them. While you may already know what some of these terms mean, others may be new to you. We are publishing or updating and republishing Explainer on a weekly basis. This article is an update of one that first appeared in 2016.
* * *
Do you have other planning terms that you would like to see featured on Explainer? Share your comments and questions in the comments section below!
* * *
Want to read other Explainers? Click on the magenta Explainer box at the top of the page.
* * *
UrbanToronto has a research service, UrbanToronto Pro, that provides comprehensive data on construction projects in the Greater Toronto Area—from proposal through to completion. We also offer Instant Reports, downloadable snapshots based on location, and a daily subscription newsletter, New Development Insider, that tracks projects from initial application.
