The Bridge of Sancho el Mayor, in Navarra, crosses the river Ebro and is part of the A-15 highway. It was built in 1978 by civil engineers Javier Manterola and Leonardo Fernández Toyano and as a cable-stayed bridge. It has a total length of 204 meters, a width of 29 m and a main light span of 142 m, to which are added two side openings on the left bank of the river. It was built with precast keystones using the "cantilever" technique (the bridge is constructed in outward projections that are added on). This suspension bridge is supported on a single pier located on the axis of the road with 35 pairs of twin cables, At the time it was built it was one of the most innovative bridges in design and materials.
A typical cable-stayed bridge is a continuous girder with one or two towers erected above piers in the middle of the span. From these piers, cables are attached diagonally to the girder to provide additional support. Engineering wise they stand in between counter steel bridges and suspension bridges. This type of bridge began ito be built n the late 19th century and its use was widespread after World War II, thanks to the technical development of the construction materials and the structural empowerment via computers.
Over the river Carrion in the city of Palencia stands the historic Puente de Puentecillas, the oldest bridge in town. Its original layout dates back to Roman times and it has undergone many changes since the 11th century, the most important of which took place in the 16th century when the current outline of the bridge was set and the remains of the Roman bridge disappeared. It stands in the city centre close to the Cathedral and other monuments and has become a popular walking area with plenty of green spaces. At the entrance of the bridge is the famous Bolo de la Paciencia, where washerwomen leaned their baskets of clothes while chatting. For years it has been a towns meeting place
Stamp Issue: 2013.06.20