Abstract: Disclosed is a structure as a ‘blanket’ constituted by blocks preferably of concrete linked (in orthogonal directions) through chords, wires, strings made of materials resistant to strengths, and the chemical environment wherein it is placed, all in order to resist hydraulic actions. The blocks basically constitute a body formed by two truncated-conic linked by their bases and located (bonded) one beside the other in a same plane, allowing the blanket to intimately adapt to the shape of the underlying surface. This layout allows the blankets to pile up one upon the other, since the block hemi-bodies fit in the empty spaces of the blankets. This geometrical advantage allows the distribution of hydraulic forces in the three directions of space, where de layers behave as a sole flexible structure. This latter aspect is the fundamental innovation (vertical fitting), like the block geometry, with disposition thereof upon a resistant mesh (articulations).