The 1812 Constitution Bridge, located in the Bay of Cadiz, was the highest bridge in Spain and the second largest cable-stayed bridge in the world when it was inaugurated. Known as the Pepa's bridge, it is 187 meters high and 3 km long, of which almost 1.5 km is over water. It is made up of 37 piers, the main ones on which the bridge hangs are 12 and 13.

Supported by 176 steel cables, 69 tons of steel were used in the construction of Pepa's Bridge. Caldibe participated in the manufacture of several of the formworks used for its development such as walkways, lintels and various climbing formworks.