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Tridilosa is a construction system based on a mixed three-dimensional structure of concrete and steel, which is composed of tubular elements connected into a pyramidal shape, invented in 1966 by engineer Heberto Castillo Martínez (1928-1997).

Tridilosa replaces girders and reinforced concrete slabs of conventional systems; its essential difference with the latter is that it does not contain filler concrete, resulting in a much lighter, stronger and cheaper structure, since its use represents considerable savings in the use of materials.

Due to its advantages and versatility it has been used to build more than 200 light bridges and floating docks; it can also be found in buildings such as the World Trade Center and the Chapultepec Tower, in Mexico City, as well as several constructions outside the country including the Biosphere 2 facility in Arizona, United States.