Prelosa (1) for construction works comprising: - a flat base (10) that has: - a lower part (11) that remains visible at the construction site, - an upper part (12) for receiving a fill material (40), and - lateral ends (13) for contacting other pre-slabs (1') which are arranged in continuity with the slab (1), and - stiffening ribs (20) that are arranged in the upper part (12) of the flat base (10) defining narrow recesses (30) to receive a reinforcement reinforcement (31) of the construction work, characterized by the stiffening ribs (20) has a grooved outer contour (21) for contacting the building fill material (40). (Machine-translation by Google Translate, not legally binding)
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