Besaflex type S controlled crack inducer pipes should be used in structures under threat of liquids under hydrostatic pressure or of groundwater, for which the formwork or concreting technology requires the works to be carried out along large wall sections. Singular continued concreting of reinforced concrete walls and walls of water tanks at long sections, however, requires certain knowledge of the properties of concrete and later rheologic influence on the behaviour of the entire structure.
In terms of structure tightness, however, very important are additional concrete deformations that take place during the use of the structure, occurring due to concrete contraction and creep. In order to limit the emergence of uncontrolled fractures and the costly and time-consuming repair work occurring because of this, controlled crack inducer pipes should be used. Their two-stage behaviour weakens, in a controlled manner, the wall cross-section, causing vertical cracks along the weakening profile, and ensures tightness by virtue of sealing anchors.