Horizontal mould for casting straight precast concrete staircases with up to 20 steps and a maximum width of 2.20 m. The number of steps can be changed by adding or removing modules. Interchangeable timber boards allow tread depths of 220 to 300 mm, while the connections between modules allow riser heights of 140 to 200 mm. A system of adjustable tensioners sets the stair pitch.
The upper and lower landings can each be up to 2 m long. The mould includes two removable extensions for casting cantilevered sections at the sides of the landings, along with supports with magnetic fixings for phenolic plywood formwork panels. Six independently controlled pneumatic vibrators compact the concrete, each operating at 14,500 vibrations per minute.
