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A method is provided for fabricating a concrete slab in a substantially horizontal slip casting process method, concrete mix is fed into a mold through a delimited cross section moving progressively in the casting process so as to form a concrete product of a desired shape. Onto the surface of the c

A method is provided for fabricating a concrete slab in a substantially horizontal slip casting process method, concrete mix is fed into a mold through a delimited cross section moving progressively in the casting process so as to form a concrete product of a desired shape. Onto the surface of the casting bed (1) is placed a core (3, 9, 10, 11) capable of delimiting the cross section of the concrete product (5, 5′) so as to provide an opening or a provision for an opening in the bottom surface of the slab. A core is provided for obtaining an opening or a provision for an opening. The structure and/or material of the core is/are such that the core is capable of yielding in vertical direction. A core may also be a multipart core, the outer part of which becomes detached from the inner part of the core in conjunction with lifting off the concrete slab from the casting bed.

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1. A method for fabricating a concrete slab in a substantially horizontal slip casting process, in which method a relatively dry concrete mix is fed into a mold through a delimited cross section moving progressively in the casting process so as to form a self-supporting concrete slab of a desired sh

1. A method for fabricating a concrete slab in a substantially horizontal slip casting process, in which method a relatively dry concrete mix is fed into a mold through a delimited cross section moving progressively in the casting process so as to form a self-supporting concrete slab of a desired shape, said delimited cross section having sides that define sides of the self-supporting concrete slab, wherein onto a surface of the mold is placed a core, said core delimiting a cross section of the self-supporting concrete slab during the casting process so as to provide an opening or a provision for an opening in a bottom surface of the concrete slab.2. The method of claim 1, wherein a distance between a top of the core and surface(s) defining a top surface of a solid-core concrete slab is 3 mm to 10 mm.3. The method of claim 1, wherein said core is made of a rubber, plastic, metal or wood material or a combination thereof.4. The method of claim 1, wherein said core comprises a detachable outer part.5. The method of claim 1, wherein a surface of the core facing concrete is coated with a material having a low adhesion to concrete.6. The method of claim 1, wherein a structure and/or material of the core is such that the core is capable of yielding at least partially in a vertical direction.7. The method of claim 1, wherein said core incorporates one or several magnets for attaching the core onto the surface of the casting bed.8. The method of claim 1, wherein a distance between a top of the core and surface(s) defining a top surface of a solid-core concrete slab is 3 mm to 5 mm.9. The method of claim 1, wherein a surface of the core facing concrete is coated with PTFE that exhibits a low adhesion to concrete.10. The method of claim 1, wherein the core is attached to the surface of the casting bed by glue.11. The method of claim 10 wherein the glue has a sufficient strength to keep the core fixed during casting, attached to the casting bed, and that after curing of the glue, the glue exhibits loss of strength as a function of time.12. The method of claim 1, wherein said core is attached to the surface of the casting bed by gluing with hot-melt glue.13. The method of claim 12 wherein the glue has a sufficient strength to keep the core fixed during casting, attached to the casting bed, and that after curing of the glue, the glue exhibits loss of strength as a function of time.14. The method of claim 1, wherein the concrete slab is a hollow-core slab and that said core is located coinciding with a hollow-core cavity of the slab being cast.15. The method of claim 14, wherein a distance between a top of the core and a lower edge of a mandrel shaping the hollow-core cavity is 3 mm to 5 mm.16. The method of claim 14, wherein said core is made of a rubber, plastic, metal or wood material or a combination thereof.17. The method of claim 14, wherein a distance between a top of the core and a lower edge of a mandrel shaping the hollow-core cavity is 3 mm to 10 mm.18. The method of claim 17, wherein said core is made of a rubber, plastic, metal or wood material or a combination thereof.19. A method for fabricating a concrete slab in a horizontal slip casting process comprising the steps of:attaching cores at predetermined locations, which are coincident with hollow core cavities in the concrete slab, on a casting bed in a casting direction; feeding a relatively dry concrete mix through a delimited cross section, which moves progressively during the curing process and which comprises sides that define sides of a self-supporting concrete slab, to form the self-supporting concrete slab of a desired shape; and curing the self-supporting concrete slab to form the concrete slab, wherein the cores delimit a cross section of the self-supporting concrete slab during the casting process so as to provide openings or provision for openings in a bottom surface of the concrete slab.