Formwork for concrete foundations

The invention relates to formwork for producing pre-cast or cast-in-situ concrete foundations for construction in the social and industrial sectors. The aim and object of the invention consist in developing flexible formwork for concrete foundations which can be used for polygonal cross-sections and can be removed at any time after setting of the concrete without a high expenditure of force. The solution according to the invention provides for pressure tubes to be arranged one above the other which are joined together from pressure-tube segments to form polygonal frames. A formwork skin is fastened in the interior of the formwork. Straps for fastening to the subsoil or for inner formwork are attached to the bottom pressure tube and to the top part of the formwork. After the concrete has set, uncomplicated removal of the formwork without the use of lifting gear is possible. The formwork according to the invention can be used for all types of polygonal foundations both in prefabrication and on site.