A premoulded block (1) and the construction method using this premoulded block that has three, four or six cavities (4) for the closure of wall panels, formation of pillars (1p), beams (1v) or even roof slabs (1t) (with or without a pitch), or floor slabs (Lj) with ties (Tr) and containment plate (14), this block (1) having an internal face (6) separating the cavities (4), external lateral parts (2), an external face (3) and bores (5), in the transverse direction relative to the cavities (4), with a distance between one bore (5) and the next bore (5) that complies with a basic rule of L/2 for determining the distance between the stirrups (10) and components with a fastening notch (7) for housing a connection support (8) and brace plate (9) assembly for supporting the ferrous beam framework (10) and ferrous fastening (11).
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