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One of the World’s Longest Suspension Bridge in Turkey Coming With 11 Billion USD Investment

One of the World’s Longest Suspension Bridge in Turkey Coming With 11 Billion USD Investment

The under-construction Gebze-Izmir Motorway is the largest ever infrastructure project in Turkey’s history. The most notable feature of the project is the 3.3 km Izmit Bay suspension bridge.
The new motorway will shorten the road distance between Gebze and Izmir by more than 140 km..
The bridge will be fourth longest suspension bridge in the world…

The most important dimensions are :

  • Total length : 2,682 m (8,799 ft)
  • Main span length : 1,550 m (5,090 ft)
  • Side spans length : 566 m (1,857 ft)
  • Clearance : 64 m (210 ft)
  • Tower height : 234.4 m (769 ft)
  • Tower size (at the base) : 8 m × 7 m (26 ft × 23 ft)
  • Deck size : 30.10 m × 4.75 m (98.8 ft × 15.6 ft)

The $11 billion road project will connect Gebze (located just east of the capital city Istanbul) and the city of Izmir in the Aegean region of Turkey with a 377 km six-lane (three lanes in each direction) motorway. Access roads of 44 km will also be built along with the motorway.

Benefits of the Gebze-Izmir Motorway :

  • The existing route between Gebze and Izmir is 540 km long and currently takes eight to ten hours to travel between the two places. The new motorway will reduce the average journey time between the two places to three to four hours, while relieving the traffic load on the existing route by more than 30%.
  • With the construction of the Izmit Bay suspension bridge, the gulf can be crossed in just six minutes compared to 70 minutes currently being taken with the use of peripheral state road.
  • The motorway will offer easy and safe connectivity between the Marmara and the Aegean regions of Turkey that together account for 60% of national GDP, 38% of freight transport and 41% of passenger transport in Turkey.
  • The Gebze-Izmir Motorway will also provide access to the Izmir Port, the ports in Marmara Region and the proposed Çandarli Port.

Construction of the Izmit Bay Bridge On the Gebze-Izmir Motorway :

  • The 3.3 km Izmit Bay Bridge will be one of the largest suspension bridges in the world and the fourth longest suspension bridge by length of central span. The bridge will connect the northern and southern coasts of the Izmit Bay in western Turkey. It will be built at the eastern end of the Sea of Marmara, near Izmit.
  • The main span of the Izmit Bay suspension bridge will be 1,580 m and the side span will be 566 m. The vertical clearance will be 64 m. The towers of the bridge will be 252 m high with a base size of 8 m x 7 m.
  • The bridge will use single cell steel orthotropic deck of 30.1 m × 4.75 m size supported by a pre-formed parallel wire strand cable system. The cable system in turn will be supported by anchor blocks.
  • The bridge is designed for earthquake resistance since it is located in a seismically active area.
  • The suspension bridge will have stiffened steel pylons built on concrete caisson foundation with steel piles. The foundation will rest on a gravel bed allowing the pylons to slide during earthquakes.
  • The bridge construction is estimated to require 85,000 t of steel and about 125,000 m3 of concrete.

August 2013