Air-film building-a structural form that uses polymer film to form a closed space, replenish air inward, and support the whole structure by internal and external pressure difference to achieve the design effect. At present, there are mainly three types of inflatable membranes on the market;
1. air bearing type: the polymer membrane and the ground form a long-span space. At the same height, the air pressure in this space is higher than that in the external space 100-500 Pascal, and the common pressure difference is about 200 Pascal. The interior of the space is a space for people to move, and it can also be understood that people stay in a big balloon. Usually used for long-span space construction, such as stadiums, storage centers, contaminated soil treatment and covering. P-type membrane materials-polyester fiber and PVC are generally used, and the surface coatings are PVDF, silica, PVF, etc.
2. Air rib type: the membrane material is processed into a columnar closed space, inflated and shaped to make it have a certain strength and make a corresponding shape. Often used in inflatable castles, inflatable arches, etc. , is very common. Materials are PVC film and ordinary cloth.
3. Air pillow type: it is made of polymer film and fixed on the existing structure in a pillow shape, and air is added inward to maintain its shape, similar to air rib type. Stands for Building-Water Cube. The material is ETFE film, commonly known as plastic king.