Vasco da Gama Bridge

Vasco da Gama Bridge

"Merging in the Mist"
Coordinates 38°45′32″N 9°02′19″W / 38.7589°N 9.0387°W / 38.7589; -9.0387Coordinates: 38°45′32″N 9°02′19″W / 38.7589°N 9.0387°W / 38.7589; -9.0387
Carries Six road lanes of  IP 1 
Crosses Tagus River
Locale Sacavém, north of Lisbon (right/north bank)
Alcochete and Montijo (left/south bank)
Official name Ponte Vasco da Gama
Owner Portuguese Republic
Maintained by Lusoponte (1994–2030)[1][2]
Characteristics
Design cable-stayed, viaducts
Total length 12.345 kilometres (7.671 mi)[3]
Width 30 metres (98 ft)
Height 155 metres (509 ft) (pylon)
Longest span 420 m (1,378 ft)
History
Designer Armando Rito
Construction begin February 1995[4]
Construction end March 1998[4]
Opened 29 March 1998
Statistics
Toll Northbound: €2.70–€11.70[5]
Southbound: toll free

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

It is the longest bridge in Europe (including viaducts),[6][7] with a total length of 12.3 kilometres (7.6 mi), including 0.8 kilometres (0.50 mi) for the main bridge and 11.5 kilometres (7.1 mi) in viaducts.[3] The Bridge is served by 4.8 kilometres (3.0 mi) of dedicated access roads.[3] It was built with the purpose of alleviating the congestion on Lisbon's other bridge (25 de Abril Bridge) and preventing that traffic travelling between the North and South of the country had to pass through the city of Lisbon.[8]

Construction began on 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.

Description

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

Vasco da Gama Bridge

The $1.1 billion project was split in 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 which receive the first 40 years of tolls of both Lisbon bridges. Lusoponte's capital is 50.4% from Portuguese companies, 24.8% French and 24.8% 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 stronger than the historical 1755 Lisbon earthquake (estimated at 8.7 on the Richter scale). 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.

View from atop Vasco da Gama Tower.
An aerial view of the bridge

Toll

Northbound traffic (to Lisbon) is charged a toll, while traveling southbound is free. Tolls are collected through a toll plaza located in the south bank of Tagus, near Montijo. As of 2016, taxes range from €2.70 (passenger cars) to €11.70 (trucks).[5]

See also

References

  1. ↑ "Vasco da Gama Bridge — Funding". Lusoponte. Retrieved 30 November 2016.
  2. ↑ "Infraestruturas Rodoviárias > Rede Rodoviária > Concessões" [Road infrastructures > Road network > Concessions] (in Portuguese). Instituto da Mobilidade e dos Transportes. Retrieved 30 November 2016.
  3. 1 2 3 "Vasco da Gama Bridge — Construction Statistics". Lusoponte. Retrieved 30 November 2016.
  4. 1 2 Vasco da Gama Bridge at Structurae
  5. 1 2 "Vasco da Gama Bridge — Tariffs". Lusoponte. Retrieved 30 November 2016.
  6. ↑ Parkstone Press (2010). Bridges. Parkstone International. p. 175. ISBN 978-1-84484-773-0.
  7. ↑ "Europe's longest bridge opened in Portugal". BBC News. 29 March 1998. Retrieved 30 November 2016.
  8. ↑ "Vasco da Gama Bridge — Background". Lusoponte. Retrieved 30 November 2016.

Sources

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