This article is about pouring concrete in moving forms. For another type of slip forming, see slipform stonemasonry. For the manufacture of ceramic vessels, see slip casting.
The first residential building of slipform construction; erected in 1950 in Västertorp, Sweden, by AB ByggingLater picture of the residential building in Västertorp
Slip forming, continuous poured, continuously formed, or slipform construction is a construction method in which concrete is poured into a continuously moving form.[1] Slip forming is used for tall structures (such as bridges, towers, buildings, and dams), as well as horizontal structures, such as roadways. Slipforming enables continuous, non-interrupted, cast-in-place "flawless" (i.e. no joints) concrete structures that have performance characteristics superior to those of piecewise construction using discrete form elements. Slip forming relies on the quick-setting properties of concrete, and requires a balance between quick-setting capacity and workability. Concrete needs to be workable enough to be placed into the form and consolidated (via vibration), yet quick-setting enough to emerge from the form with strength. This strength is needed because the freshly set concrete must not only permit the form to "slip" by the concrete without disturbing it, but also support the pressure of the new concrete and resist collapse caused by the vibration of the compaction machinery.
Slipforming of a 118 metre-tall grain silo in Zürich in 2015Continuous slip formed gravity-based structure supports under construction in a Norwegian fjord. The visible jib cranes would be delivering buckets of concrete to the support cylinders during the continuous pour of concrete creating seamless walls.
In vertical slip forming the concrete form may be surrounded by a platform on which workers stand, placing steel reinforcing rods into the concrete and ensuring a smooth pour.[2] Together, the concrete form and working platform are raised by means of hydraulic jacks.[3] Generally, the slipform rises at a rate which permits the concrete to harden by the time it emerges from the bottom of the form.[1]
In horizontal slip forming for pavement and traffic separation walls, concrete is laid down, vibrated, worked, and settled in place while the form itself slowly moves ahead. This method was initially devised and utilized in Interstate Highway construction initiated by the Eisenhower administration during the 1950s.
Slipform monobox system
^ abNawy, Concrete Construction Engineering Handbook, 2008, p. 10—33.
^Cite error: The named reference Balti was invoked but never defined (see the help page).
^Nawy, Concrete Construction Engineering Handbook, 2008, p. 10—34.
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