<p>With the aim of developing the Southwest of Venezuela and enable its connections with the rest of the country, a third bridge over the Orinoco River was designed between the cities of Cabruta, State of Guárico in the north and Caicara del Orinoco in the south.</p><p>The combined highway and railroad bridge Puente Mercosur will be the third crossing of the Orinoco with a total length of 11.125 km. The stay-cable main bridge with 360m main span and the adjacent approach bridges with a length of 2 x 720m are comprised of a steel composite truss girder with a depth of 12.0m. The pylons and piers are founded on piles with a diameter of 2.50m resp.</p><p>2.00m and a length of up to 80m.</p><p>The deck for the approach viaducts and the side spans of the main bridge is assembled in construction yards adjacent to the southern and northern abutments, before launching each into its final position using Teflon plates on top of the piers, and lifting devices at the front and end of the sections to compensate deformations of the superstructure during launching. The centre segment of the main bridge with a length of 120 m and a dead weight of 2400 ton will be lifted from a barge. A non linear time history analysis has been performed for the earthquake design of the shock transmitter bars in the approach viaducts.</p>
Die dritte Brücke über den Orinoco verbindet die Orte Cabruta, Provinz Guárico, im Norden und Caicara del Orinoco, Provinz Bolivar, im Süden und hat eine Schlüsselstellung in der weiteren Erschließung Venezuelas, insbesondere der Gebiete südlich des Orinoco. Die kombinierte Straßen‐ und Eisenbahnbrücke hat eine Gesamtlänge von 11125 m. Die doppelstöckige Hauptbrücke mit einer Länge von 2280 m und Regelstützweiten von 120 m hat eine seilverspannte Hauptöffnung von 360 m. Der Überbau ist ein Verbundfachwerk mit einer Gesamthöhe von rund 12 m. Die diamantenförmigen Pylone haben eine Höhe von 182,5 m und werden auf 39 Großbohrpfählen mit einem Durchmesser von 2,5 m und einer Länge von 80 m gegründet. Der Überbau wird in 60 m Schüssen mit Pontons zur Baustelle transportiert, dort zu 360 m langen Einheiten zusammengebaut und auf Teflon‐Lagern eingeschoben, hierzu sind temporäre Verstärkungen erforderlich. Das 120 m lange und 2400 t schwere Schlussstück der Schrägkabelbrücke wird eingeschwommen und mit Litzenhebern gehoben. The third bridge across the Orinoco River/Venezuela – A doubledeck bridge cable‐stayed bridge for highway and railroad with composite truss girder. With the aim of developing the Southwest of Venezuela and to enable its connections with the rest of the country, a third bridge over the Orinoco River was designed between the cities of Cabruta, State of Guárico, in the north and Caicara del Orinoco, State of Bolivar, in the south. The combined highway and railroad bridge will have a total length of 11125 km. The stay‐cable main bridge with 360 m main span and the adjacent approach bridges with a length of 2 · 720 m are comprised of a steel composite truss girder with a depth of 12,0 m. The diamond shaped pylons are founded on piles with a diameter of 2,5 m and a length of up to 80 m. The bridge is transported to the site on barges in lengths of 60 m and assembled in construction yards adjacent to the southern and northern abutments to elements of 360 m, before launching each into its final position using Teflon plates on top of the piers; this requires temporary strengthening. The center segment of the main bridge with a length of 120 m and a dead weight of 2400 t will be lifted from a barge.
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