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Pneumatic formwork system in structural engineering

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Document pages: 13 pages

Abstract: As a building material, concrete has the characteristics of high compressive strength, low tensile strength and good castability. In order to make full use of the potential of this material, the form of bearing structure must be designed according to the stress distribution in the structure. Some hollow structures (such as hollow beams) or hyperbolic structures (such as shells) have good characteristics. In hollow structures, materials can be saved in a single building component by locally reducing the size. If properly designed, the concrete shell mainly transmits the load through membrane stress, so it can span a large area. However, the main problem of these structures is that it takes a lot of effort to produce complex templates. A pennyssibility of reducing this effort is to use a pneumatic formwork. This paper describes different pneumatic formwork systems invented in the past 100 years and presents the latest developments in this area. The many types of possible applications are divided into three categories in order to obtain a clearer overview. Finally, a new construction method, called “Pneumatic Forming of Hardened Concrete (PFHC),” is presented. This method was invented at the TU Vienna and uses the pneumatic formwork in a novel way.

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