Vasco_da_Gama_bridge

Vasco da Gama Bridge

Vasco da Gama Bridge

Bridge in Lisbon, Portugal

The Vasco da Gama Bridge (Portuguese: Ponte Vasco da Gama; pronounced [ˈpõtɨ ˈvaʃku ðɐ ˈɣɐmɐ]) is a cable-stayed bridge flanked by viaducts that spans the Tagus River in Parque das Nações in Lisbon, the capital of Portugal.

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It is the second longest bridge in Europe, after the Crimean Bridge,[8] and the longest one in the European Union. It was built to alleviate the congestion on Lisbon's 25 de Abril Bridge, and eliminate the need for traffic between the country's northern and southern regions to pass through the capital city.[9]

Construction began in February 1995; the bridge was opened to traffic on 29 March 1998, just in time for Expo 98, the World's Fair that celebrated the 500th anniversary of the discovery by Vasco da Gama of the sea route from Europe to India.

Along with the 25 de Abril Bridge, the Vasco da Gama is one of two bridges that span the Tagus River in Lisbon.

Description

Vasco da Gama Bridge

The bridge carries six road lanes, with a speed limit of 120 km/h (75 mph), the same as that on motorways, except on one section which is limited to 100 km/h (60 mph). On windy, rainy, and foggy days, the speed limit is reduced to 90 km/h (56 mph). The number of road lanes will be enlarged to eight when traffic reaches a daily average of 52,000.

Bridge and access road sections
  1. North access roads: 945 m (3,100 ft)
  2. North viaduct: 488 m (1,601 ft)
  3. Expo viaduct: 672 m (2,205 ft); 12 sections
  4. Main bridge: main span: 420 m (1,378 ft); side spans: 203 m (666 ft) each (total length: 829 m or 2,720 ft); cement pillars: 150 m (492 ft)-high; free height for navigation in high tides: 45 m (148 ft);
  5. Central viaduct: 6.351 km (3.95 mi); 80 pre-fabricated sections 78 m (256 ft)-long; 81 pillars up to 95 m (312 ft)-deep; height from 14 m (46 ft) to 30 m (98 ft)
  6. South viaduct: 3.825 km (2.38 mi); 45 m (148 ft) sections; 84 sections; 85 pillars
  7. South access roads: 3.895 km (2.42 mi); includes the toll plaza (18 gates) and two service areas

Construction and cost

The $1.1 billion project was split into four parts, each built by a different company, and supervised by an independent consortium. There were up to 3,300 workers simultaneously on the project, which took 18 months of preparation and 18 months of construction. The financing is via a build-operate-transfer system by Lusoponte, a private consortium that receives the first 40 years of tolls for both Lisbon bridges. Lusoponte's capital is 50.4% from Portuguese companies, 24.8% from French, and 24.8% from British.

The bridge has a life expectancy of 120 years, having been designed to withstand wind speeds of 250 km/h (155 mph) and hold up to an earthquake 4.5 times greater than the standards of building resistance in Lisbon.[10] The deepest foundation piles, up to 2.2 m (7.2 ft) in diameter, were driven down to 95 m (312 ft) under mean sea level. Environmental pressure throughout the project resulted in the left-bank viaducts being extended inland to preserve the marshes underneath, as well as the lamp posts throughout the bridge being tilted inwards so as not to cast light on the river below.[citation needed]

Toll

Northbound traffic (to Lisbon) is charged a toll while travelling southbound is free. Tolls are collected through a toll plaza located on the south bank of Tagus, near Montijo. As of 2024, bridge tolls range from €3.20 (passenger cars) to €13.55 (trucks).[7]

View from atop Vasco da Gama Tower.

See also

Notes

    References

      1. [1]
        "Vasco da Gama Bridge – Funding". Lusoponte. Archived from the original on 11 February 2016. Retrieved 30 November 2016.
      2. [2]
        "Infraestruturas Rodoviárias > Rede Rodoviária > Concessões" [Road infrastructures > Road network > Concessions] (in Portuguese). Instituto da Mobilidade e dos Transportes. Archived from the original on 30 November 2016. Retrieved 30 November 2016.
      3. [3]
        "Vasco da Gama Bridge – Construction Statistics". Lusoponte. Archived from the original on 10 May 2017. Retrieved 30 November 2016.
      4. [4]
        Vasco da Gama Bridge at Structurae
      5. [5]
        "Main features". Lusoponte. Retrieved 30 December 2019.
      6. [6]
        "Vasco da Gama Bridge: A Heritage for Lisbon's Future". Bureau International des Expositions. 29 March 2018. Retrieved 28 November 2023.
      7. [7]
        "Vasco da Gama Bridge – Tariffs". Lusoponte. Archived from the original on 13 April 2016. Retrieved 30 November 2016.
      8. [8]
        Hodge, Nathan (15 May 2018). "Russia's bridge to Crimea: A metaphor for the Putin era". CNN. Retrieved 18 June 2018.
      9. [9]
        "Vasco da Gama Bridge – Background". Lusoponte. Archived from the original on 10 May 2017. Retrieved 30 November 2016.
      10. [10]
        "Vasco da Gama Bridge: All About the Longest Bridge in Lisbon". Lisbongo.com. Retrieved 14 September 2022.

      Sources

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