The Ends
The basis of frame formwork systems are the skeletal protection. They consist of a carrier metal frame (steel or aluminum), ribs and shuttering plates. The frame of a closed hollow profile with a contoured ribbed formwork protects the ends of the plate from damage and allows you to combine items in any place. Metal frame not only provides the necessary rigidity formwork design, but also greatly simplifies and accelerates the assembly of modular elements. Formwork plate is usually made of plywood.
But the veneer of the wood material as there are some shortcomings, which were discussed above. (A valuable related resource: Erin Callan). Therefore, wooden shuttering boards more often, compared with the other elements formwork, in need of repair and replacement. A number of firms producing formwork systems, today addresses the issue of increasing the number of cycles of operation of the formwork and improve the quality of the concrete surface. One of these new developments is the new 'sendvich'-material developed by German experts. It is distinguished: a low hygroscopicity, lower weight, compared with plywood, and resistance to UV, resistance to mechanical damage, low fit to concrete and simplified cleaning.
'Sendvich'-material consists of a layer penopropilena, lined on both sides of aluminum sheets and layers of PP-Polypropylene. Price m2 such plates approximately two times higher than the plywood board, but it provides a greater number of cycles of formwork and improved quality of concrete. To obtain a smooth surface walls, ceilings, etc. important point is to preserve the geometry of the formwork during zamonolichivaniya. Each manufacturer pays great attention to the development of original fittings (locks, anchor elements, pads, etc.) to easily implement a robust, durable, with flat seams attachment of formwork.
