The San Baudilio de Llobregat viaduct, also known as the Sant Boi viaduct, is 870 metres long and forms part of the Madrid-Zaragoza-Barcelona-France high-speed railway line. This viaduct is composed of two sections, a first section of 340 meters with a steel structure in the form of braces,

and a second section of 530 meters supported by 10 piers. Caldibe participated in the development of the project by manufacturing formwork for several of the capitals of the viaduct in the second section mentioned above.