Facade and Floor ElementsProducts
A hollow-core slab is a prestressed precast floor unit with continuous longitudinal voids. Its light section spans wide openings without intermediate supports, making it suitable for mezzanines, upper floors and roof decks.
A hollow-core slab is a precast floor unit reinforced with prestressing strands and containing circular or oval voids that run its full length. The voids remove concrete that adds little to load-bearing capacity, making the slab lighter, while prestressing lets it span further for the same depth.
In industrial buildings, hollow-core slabs are used to form mezzanines and upper floors on a frame of precast columns and beams. The slabs are placed side by side on the bearing ledges of the beams; once the joints between them are grouted, they work together as one floor. Depending on the design, a reinforced structural topping is cast on top to improve the integrity of the floor. As no formwork or propping is needed, work can continue on the floor below while the slabs are being laid.
Slab depth is chosen for the span and the load the floor will carry; deeper sections are used as spans and loads increase. The number and layout of strands and the slab lengths are set in the structural design. Service openings, notches around columns and skewed ends can be prepared during production. Slabs can be designed to meet fire resistance requirements with suitable concrete cover. TS EN 1168 is the reference standard for this product.
Hollow-core slabs are produced on long steel casting beds. The strands are tensioned along the bed, then the concrete is placed and compacted continuously by an extruder or slipform machine that forms the voids. When the concrete has gained enough strength, the strands are released to transfer the prestress into the concrete, and the continuous slab is saw-cut to the lengths in the design. Each slab is checked for dimensions, surface and strand position.
Slabs are delivered on long trailers and lifted by crane onto the beams using purpose-made lifting clamps. Because large areas can be covered quickly, erection speeds up markedly in multi-storey buildings. Once the joints are grouted and, where required, the topping is cast, the floor is ready for use.
A cast-in-place floor needs formwork, fixed reinforcement and time for the concrete to gain strength. With hollow-core, the floor is closed in with slabs from the plant as soon as the structural frame is complete. The light section also reduces the load on columns, beams and foundations. This is why it is a common floor system for mezzanines and office levels in industrial buildings built with precast columns and beams.
Dimensions, reinforcement and load capacity are set by structural design for each project; contact us for technical details.
Perimeter and Protection Elements
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Prefabricated Plant Construction
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Facade and Floor Elements
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