Patent ID: 7807089

Claim:
A method for manufacturing ground or pavement slabs from cement-bonded material or concrete with a facing made of fine-grade or facing concrete forming the top surface of the respective ground slab and with a core made of cement-bound core concrete forming the bottom surface by pressing in a mold cavity of a press mold, which comprises: (i) a die closing the mold cavity at the bottom, (ii) a molding frame limiting the mold cavity on one periphery and pressing tightly against one edge of the die, and (iii) a press die that can be inserted into the molding frame from the top side of the latter, the method comprising the steps of: first pouring the facing concrete forming the top surface into the mold cavity, after that pouring the core concrete forming the core into the mold cavity, with the core concrete having a water content smaller than the water content of the facing concrete, pressing the facing concrete and the core concrete in the mold cavity by means of the press die, using a molding frame, the inside surface of which limits the mold cavity and is provided over the entire height with continuous structuring for forming a wavelike or irregularly formed side contour of each of the peripheral sides of the manufactured ground slabs, using a die which is a drop base die for molding a structured or broken edge adjoining the side contour of the manufactured ground slab with a die edge area enclosing a trough-shaped recess and forming the structured or broken slab edge with an irregular edge profile, which when the press mold is closed transitions seamlessly or nearly seamlessly into the structured inside surface of the molding frame, with a distance of the level of the edge of the drop base die from the level of lowest point of the drop base die being at least 3-5 mm, and using a press die which is adapted on its periphery to the course of the inside surface or structuring of the molding frame forming the side contour, the slabs being formed on their top side with profiling or structuring featuring raised and recessed areas and being processed on the structured top surface after molding and setting of the concrete so that the raised areas of the profiling have a different surface structure than the recessed areas of the profiling.