Slipform is a building technique where low-lying shapes are used to shape walls and moved as building material is added. It can be used with masonry and solid castings of concrete. Workers add reinforcement and control the characteristics of the casting. It can be used for a variety of structures and materials, including green building with soil materials.
Slipform is a building technique in which a series of low-lying shapes are used to begin shaping walls and shift the shapes as they build up, allowing the finished walls to emerge underneath as building material is added on top. This method is available for use with masonry constructions as well as solid castings of concrete and other materials. Structures such as houses, retaining walls, curbs and so on can be built using this technique and is suitable for a variety of climates and building materials.
In solid concrete construction, flowing form involves the use of a continuous pour of concrete as workers move the molds. The formulation of the concrete must be very precise, as it must be firm enough to stand on its own as the molds rise, without setting so fast that cracks and lines appear in the finished product. Large-scale slipform concrete construction began in the 1960s and can be seen in action around the world.
As the molds rise, workers add reinforcement to the concrete in the form of rebar and other structural elements. They move with the moulds, usually on a platform with hydraulic jacks, and control the characteristics of the concrete casting. They need to compact the concrete to keep it solid and get rid of bubbles and other problems. When the structure is completed, it can be finished by removing the runs and smoothing the surface to prepare it for surface treatments, if desired.
With masonry, workers begin with a series of low-lying shapes and begin a course in masonry and concrete. As it sets, they move the modules for the next course. The forms support the masonry as it sets and provide firm guides to keep it looking even. The movement of the shapes tends to create lumps and streaks of concrete that can be left in place for a rustic look, or smoothed out during the finishing phase. One advantage of formwork construction is that you can do it without an assistant, even though the construction will take longer.
People using this technique in masonry work may employ bricks, concrete masonry units, paving stones, and a variety of other materials. Those interested in green building can try slide form methods using soil materials if suitable rocks for building are available. The technique can be useful for building foundations and walls, and masonry confers environmental benefits such as retaining heat and controlling internal temperatures in all climates and weather conditions.
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