The system comprises: formwork panels (1a, 1b, 1c, 1d, 1e, 1f and 1g) provided with an inner surface (2) that extends peripherally in the form of a perimeter flange (3) provided with holes (4) for the mounting of connection means, and which, together with the inner surface (2), forms a structure in the manner of a hollow box that is open towards the exterior side and that, internally, has a frame of longitudinal and transverse reinforcements (5) constituted by folded plates, means for securing the successive formwork panels for forming a concreting mould and means for securing reinforcements inside the formwork.
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