Spanning 50 meters over the Arga river, Oblatas bridge allows the integration of a peripheral quarter in the main area of Pamplona. Its careful design intends to underline this will of social integration.
We have designed a bow string concrete bridge made up of an elevated, central plane shell arch of 60 cm depth and with width increasing from the crown to the abutments, from which a stiff deck is suspended. This is a true shell arch with very small cross section, from which two sets of hangers, which are directly anchored at the buttom of the stiff beam located at the center of the deck, are suspended.
The harmony reached by the combination of arch and suspension ties, both composing parallel inclined planes, and the delicate details of the hinges and anchorages of the hangers, result in a perception of the bridge by the users and the Pamplona population that is the one corresponding to an urban, and useful sculpture.
The bridge was constructed on a scaffold, making use of hydraulic jacks located at the key of the arch, in order to lift the deck off the provisional supports and suspend its from the arch.