Parma Oy

Hannu Tomminen

An apparatus for the instant cutting of hollow-cored concrete slabs wherein the cast cored slabs are subjected to an instant cutting operation prior to the hardening of the concrete mix in such a manner that exposes the cores and the ends of the cores are filled to avoid jointing mix from intruding into the cores. The instant cutting is performed by driving two sheet-shaped cutting blades (3), which are mutually placed in a V-shaped posture, through the slab to make cutting tips (10) of the blades (3) meet at the bottom of the slab. A cutting knife (1), whose sides (16) face the mix and are disposed essentially parallel to the cutting blades (3), is driven through the slab, between the cutting blades (3), towards the cutting tips (10) of the blades (3). When the end cutting knife (1) reaches its lower position, the cutting blades (3) are lifted up, and the thus formed homogeneous sheet (17) of mix is pushed by means of the end cutting knife (1) to adhere to a cutting surface (18) formed by the cutting blades on the slab.

Apparatus for cutting hollow-cored concrete slabs

The invention concerns a slip-form casting machine for fabrication of elongated concrete products. The slip-form casting machine comprises a feed hooper (1), an auger (6) for exerting pressure onto a concrete mix to be cast, and a casting mold (10, 11). According to the invention, the casting mold (10, 11) is a tubular construction plugged at one end, and the auger (6) is connected to a casting machine body (18) which is substantially complementary with the cross section of the casting mold (10) and is movable with respect to the mold (10) in order to facilitate slip-form casting of a product (7) with an elongated shape in the axial direction of the casting mold. The slip-form casting machine in accordance with the invention produces smooth and high-quality surfaces in concrete products.

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Nurmijarvi, Finland

Hannu Tomminen