The assembly formed by a beam reinforcement element 4 contained inside a permanent formwork element 5 is placed in the excavation 2, the elements 4 and 5 being held together by means of spacers 6. The excavation is filled with earth 7 and the part of the formwork 5 extending beyond the buried level of the beam is folded back onto the ground 1. The slab and beam are then simply cast with concrete 9 in a single operation. The invention applies to the formation of slabs on an earth platform comprising beams having a height greater than the thickness of the slab. IMAGE
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