Slipform is developed especially for vertical concrete structures such as walls and columns in high rise building and chimneys. As its name suggests, slipform is a self-climbing formwork for concrete pouring that is secured and remains in place until the top of the structures.
The construction begins a fixed-diameter steel assembled on top of a foundation. This creates the cavity of the wall where reinforcing steel is tied. The form connects to jack rods with hydraulic jacks, which automatically move the form vertically as the concrete is being poured. Upper and lower decks suspended to the rig provide areas for other supporting works. Operations such as insertion of reinforcement, of door and window frames, equipment and concrete quality control and concrete surface finishing can be performed at the same time during concrete pouring and the equipment rising.
High progress rate is possible with continuous concrete pouring. Total height per 24-hour is approximately 6.00 meters. It is considered as the fastest technique of construction vertical structures.