Method and facility for cutting concrete product

1. A method for cutting a slipform cast hollow-core concrete product with water jet cutting, wherein the hollow-core concrete product comprises an upper surface, a lower surface, two side surfaces and multiple hollow-cores and wherein the side surfaces and the hollow-cores are laterally arranged in between the upper surface and the lower surface,

the method comprises the steps:

forming depressions, or grooves, or both, in the upper surface of the fresh cast hollow-core concrete product before curing of the hollow-core concrete product in one or more areas to be cut with water jet cutting, which depressions or grooves extend to at least some of the hollow-cores of the concrete product, wherein the forming of depressions, or grooves, or both is implemented at a casting place,

curing the hollow-core concrete product, and

transferring the cured hollow-core concrete product from the casting place to a separate workstation for the water jet cutting.

2. The method according to claim 1 , wherein the formed depressions, or grooves, or both, in the concrete hollow-core product are large enough to contain the nozzle of a water jet cutting device.

3. The method according to claim 1 , wherein the water jet cutting is implemented from the opposite side of the hollow-core concrete product from the side where the forming of the depressions, or grooves, or both has occurred.

4. An apparatus for cutting a slipform cast hollow-core concrete product with water jet cutting, which facility comprises:

one or more devices for slipform casting a hollow-core concrete product, wherein the hollow-core concrete product comprises an upper surface, a lower surface, two side surfaces and multiple hollow-cores and wherein the sides surfaces and the hollow-cores are laterally arranged in between the upper surface and the lower surface,

a water jet cutting device,

a device for forming depressions and grooves in the upper surface of a fresh cast hollow-core concrete product before curing of the hollow-core concrete product in one or more areas to be cut with water jet cutting, wherein said depressions and grooves extend to at least some of the hollow-cores of the concrete product; and

further comprising a separate workstation for water jet cutting of a cured hollow-core concrete product.

5. The apparatus according to claim 4 , wherein the device for forming depressions and grooves comprises a movable rotary elongate milling tool for milling the surface of the fresh cast hollow-core concrete product.

6. The apparatus according to claim 4 , further comprising devices for transferring the cured hollow-core concrete product to the separate workstation for water jet cutting.