Slipforming is a long tried-and-true construction method for building tall structures such as all kind of building cores, silos and tower-shaped structures such as flue-gas stacks and bridge pillars.
The entire slipform is raised on jack rods together with working decks, moving upwards together with the structure being built. Slipforming ensures that the usual steps involved in building a concrete structure, such as pouring concrete, reinforcing it, and curing it, can be performed in a single continuous process.
During slipforming, the form is raised in 25-mm steps by a number of hydraulic jacks that depends on the actual size of the project.
The rate at which the form is lifted will depend on the concrete’s setting time, the work that must be performed during slipforming, and the size and complexity of the concrete structure.
Due to the continuous nature of this method, work is performed during the day only (dayshift) or around the clock (day- and nightshift), with forms commonly being raised by 3 to 8 meters in a period of 24 hours.
