Abstract: In a modular structure consisting of rods and junction plates joined orthogonally to each other, the rods are attached by means of expanding linking pins to tubular coupling hubs provided on the front face of each junction plate at right angles therewith. The latticework rods are attached by means of connecting grippers to an enlarged attachment molding formed along one edge between two orthogonally joined junction plates having complementary beads in the mating flanges of these plates. Thus, from a latticework knot formed by two or more junction plates, rods can be branched off either orthogonal to the plates or inclined relative to the plates.