The Bosphorus and the two sides of this Bosphorus are called the Bosphorus, from the two straits connecting the Black Sea to the Mediterranean via the Marmara Sea.
Since ancient times, tribes and armies who wanted to move from Asia to Europe or from Europe to Asia used one of Istanbul or Dardanelles, and it was always imagined that a bridge was built on them.
The first bridged passage from the Bosphorus was in BC. VI. It is said to have occurred in the century. Persian king Dara In 512, when Scythians chased to the west, it was recorded in the narrowest part of the Bosphorus, where the engineer of the city of Sisam built a bridge between the shadows, and the crowded army passed from the Anatolian side to the Rumeli side.
The integration of the two continents with a suspension bridge has been a topic of discussion for many years in Turkey. When it was not possible to meet the heavy traffic between Europe and the Anatolian side with the caravans, the Turkish government decided to build a bridge to the Bosphorus. The construction of the bridge was started in April, 1970, after the necessary project was prepared by British Freeman Fox and Partners Company. The Bosphorus Bridge, which was completed within approximately 3 years, was opened to traffic by the President Fahri Koru-türk on 29 October 1973.
Construction and Properties of the Bridge
Ortaköy and Beylerbeyi were chosen as the most suitable places for the Bosphorus Bridge. According to the project, the total length of the bridge was estimated to be 1,560 m, the height from the sea surface to be 64 m, and the main gap between the two sides to be 1 074 m. The other measurements were as follows: Ortaköy margin width, 231 m; Beylerbeyi margin clearance, 255 m; Width of the bridge, 6 strips of 3,5 m each (21 m) for cars, 28 m between the carriages and 33 m between pedestals (2.5 m each pedestrian lane). At the beginning of the bridge, there were 4 large pylons measuring 165 m in height and 7 x 5.2 m in dimensions. Elevators were installed to carry 20 people into these towers.
The bridge carries two main cables. Each of these is about 60 cm in diameter and consists of 19 strands and 4 additional strands. There are 548 in each main strand, and 190 steel wires in each additional strand. Thus, on a main cable, approximately 11 200 wires are meant.
For this main cable suspension bridging base, 60 steel of 17.9 meters each were used.
The construction work of the bridge was carried out by Hochtief A.G., a German company. And an English firm, The Cleveland Bridge Engineering Co. Ltd. Anglo German Bosphorus Bridge Consortium. The peripheral roads connected to the bridge, the overpasses and their connections were made by the local organizations.