The object of the invention is a core element which, after repeated, transversely inverted and appropriate combination, is the carrier core, in particular the composite plate applicable, inter alia. in bridge constructions, road constructions for the construction of composite containers, filling of crane constructions. The element essentially has the shape of a rib close to the letter VZ, whose outer wall (1) is angled (?) a sharp not greater than 70'th crosses the arc into a right cross wall (2),which, at the point of (ss), is not greater than 130o, crosses into a horizontal wall (3),which, in turn, in the angle (?) a sharp, not greater than 70'th, crosses in an inclined downward direction a cross-sectional wall (4) parallel to a cross-sectional wall (2),where walls (1, 2, 3 and 4) are formed as a hard, strong, one- or multi-layered plastic element.
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