hollekernplaten

Hollekernplaten are prefabricated hollow-core concrete slabs used as floor or roof elements in buildings. They consist of a single concrete member with several longitudinal hollow cores that run along the length of the slab. The cores are formed during production by inserting void formers, commonly polystyrene or PVC, around which concrete is cast or extruded. In many systems, prestressing steel strands are integrated to increase bending strength, producing prestressed hollow-core slabs.

The hollow cores reduce weight and cement use while preserving structural stiffness, allowing longer spans and faster installation compared to solid slabs. The top and bottom concrete layers provide the finished surface and required strength, while the underside often shows a ribbed pattern due to the voids. Production takes place in precast plants, after which slabs are transported to site in long lengths and lifted into place.

Wall and column connections, along with joints between slabs, are designed to accommodate movements and enable proper load transfer. A concrete topping or direct finishing may be added on site to achieve the final floor surface and to form a composite floor if required. Toppings can also address service penetrations and fire-resistance requirements.

Advantages of hollekernplaten include reduced dead load, faster on-site construction, good dimensional accuracy, and efficient spanning for multi-storey buildings and parking structures. Disadvantages include the need for precise handling of long precast elements, limited in-situ architectural customization, and the planning required for service routes and openings. They are widely used in residential, commercial, and industrial construction, particularly where repetitive spans and rapid construction are prioritized.