Constructing a new building is a messy and often complicated process, but one particular piece of equipment helps make the procedure a lot smoother. To construct concrete walls and floor slabs, the material must be poured into a mould. This structure, also known as formwork, is usually temporary. 

Fly forms being repositioned by the tower crane, image by Marcus Mitanis

A common sight in many developments, fly forms — or table forms — make the moulding process more efficient. When dealing with simpler floor layouts, usually above the more complicated podium levels, trusses are assembled and covered with plywood. Layers of steel then sandwich any electrical and mechanical lines atop the plywood, and concrete is poured to cap the floor. Once the concrete settles, the truss is pulled out, usually by the tower crane, to repeat the job again in another position. To ensure strength for the new floor, temporary jacks are installed. 

Fly forms being used in two Toronto projects, image by Marcus Mitanis

The image above shows two Toronto projects, INDX Condos and EY Tower, both utilizing the fly form technique. Yellow jacks are visible on the top floors, helping support the recently-poured concrete layers above. 

Are fly forms common in the construction industry where you live? Let us know by leaving a comment in the field below.