One of the busiest roads in the city of Zaragoza
Ronda de la Hispanidad is an important thoroughfare on Saragossa's third ring road. It contains three outstanding construction jobs: the bridge over the Ebro River, the Imperial Canal of Aragón aqueduct and the Los Pinares de Venecia footbridge.
The bridge over the Ebro River
is a five-span bridge (40 metres, 120 metres, 52 metres, 40 metres). Crosswise it is 31.9 metres wide and accommodates a three-metre-wide median in the centre, flanked by two ten-metre-wide vehicle lanes and then two four-metre-wide sidewalks.
The bridge can be subdivided into three parts. The central portion is an arch bridge with a 120-metre span, and at each side of it stands a 92-metre-long lateral portion separated from the central portion by an expansion joint. The lateral portions and the central portion do not interfere with each other's strength in the least. They only use the same pier for shared support, lapped for mutual coaction in the amount of load transferred to the pier. In fact, the cap on the central area is anchored at the pier by torsion, which is avoided with the support of the access sections.
The arch is parabolic and rises 18 metres. It has a triangular cross-section that swells from a minimum edge thickness of 1.6 metres in the centre to a maximum edge thickness of 1.74 metres next to the supports. The triangular section is bevelled at the corners. The sheet is 60-millimetre-thick steel. The concrete inside completely fills the arch and is bonded to it so as to form a compound structure.The aqueduct of the Imperial Channel of Aragón
is also a landmark job, because it has to respond to two important functional needs: It withstands a water load of 35.8 T/m, and it provides the surface for two seven-metre-wide lanes of traffic with a three-metre-wide sidewalk. Because of its dual nature, the construction is referred to as an aqueduct bridge.
Crosswise, it looks like a slab whose thickness varies from 0.20 metres on the edge to 1.8 metres where it meets the side wall, shrinking to 0.45 metres at the structure's axis. The traffic lanes run along the overhangs.The Pinares de Venecia footbridge
was built to connect the two banks of the leisure area. It is 86 metres long and has a useful width of three metres. It is built with two steel pipes 550 millimetres in diameter, from which the metal cap is hung. The arches lie on two open inclined planes to give pedestrians a sensation of great breadth.