A method and mould core for casting concrete elements

摘要

In the casting of a concrete element, such as a column support block (1), in which there is used a mould core (3) designed to produce one or more recesses or grooves in the element (1), the mould core is provided with one or more apertures (3b) or slots, in each of which there is arranged a recess-forming mould part (3a) which can be moved in said aperture or slot by means of a ram (6; 6'). Prior to a casting operation, the moveable mould part (3a) is moved to an outwardly projecting active position and, subsequent to the cast element hardening, is withdrawn by means of the ram, thereby to enable the cast element and the mould core to be separated from one another. All of the moveable core parts (3a) on one side surface of the mould core can be arranged on a plate (5') extending parallel to the corresponding side surface of the mould core and arranged to be acted upon by the ram.;The invention also relates to a mould core provided with apertures (3b) or slots for moveable mould parts (3a), the mould parts being arranged for movement by means of a ram (6; 6') between an active, casting position and an inactive position in which the cast element (1) can be removed from the mould core (3).