Showing posts with label bridge. Show all posts
Showing posts with label bridge. Show all posts

Friday, May 26, 2017

GALATA BRIDGE

Istanbul - Turkey

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The Galata Bridge (in Turkish Galata Köprüsü) is a bridge that spans the Golden Horn in Istanbul, Turkey. From the end of the 19th century in particular, the bridge has featured in Turkish literature, theater, poetry and novels.

Dimensions : Main span 80 m, Total length 465 m, Deck width 42 m

History
The first bridge on the Golden Horn which was built by Justinian the Great can be seen near the Theodosian Land Walls at the western end of the city in this rendering of old Constantinople. The oldest recorded bridge over the Golden Horn in Istanbul was built during the reign of Justinian the Great in the 6th century close to the area near the Theodosian Land Walls at the western end of the city. In 1453, during the Fall of Constantinople, the Turks assembled a mobile bridge by putting their ships next to each other and used it for transporting their troops from one side of the Golden Horn to the other.

In the years 1502-1503 plans to construct the first bridge in the current location were discussed. Sultan Bayezid II solicited a design and Leonardo da Vinci, utilizing three well-known geometrical principles, the pressed-bow, parabolic curve and keystone arch, created an unprecedented single span 240 m long and 24 m wide bridge for the Golden Horn, which would become the longest bridge in the world of that period if constructed. However, the ambitious design did not meet with the Sultan's approval. Another Italian artist, Michelangelo was also invited to design a bridge for Istanbul. Michelangelo rejected the proposal, and the idea of building a bridge across the Golden Horn was shelved until the 19th century.

A smaller scale version of Leonardo da Vinci's Golden Horn Bridge was brought to life in 2001 near Oslo, Norway by the contemporary artist Vebjørn Sand, the first civil engineering project based on a Leonardo da Vinci sketch to be constructed. The Leonardo Bridge Project hopes to build the design as a practical footbridge around the world, including the Golden Horn in Istanbul, using local materials and collaborating with local artisans as a global public art project. The Wall Street Journal referred to the Project as a "...logo for the nations." (WSJ, Nov. 5-6, 2005)

Hayratiye
Hayratiye Bridge (Cisr-i Atik)In the early 19th century Mahmud II (1808-1839) had a bridge built at some distance up the waterway between Azapkapi and Unkapanı. This bridge, known as the Hayratiye (Benefaction in English), was opened on September 3, 1836. The project was carried out by Deputy Lord High Admiral Fevzi Ahmet Paşa using the workers and facilities of the naval arsenal. According to the History of Lütfi, this bridge was built on linked pontoons and was around 500 to 540 m long.

Cisr-i Cedid
The first Galata Bridge at the mouth of the waterway was constructed in 1845 by Valide Sultan, the mother of Sultan Abdülmecid (1839-1861) and used for 18 years. It was known as the Cisr-i Cedid or New Bridge to distinguish it from the earlier bridge further up the Golden Horn, which became known as the Cisr-i Atik or Old Bridge.

On the Karaköy side of the bridge, there was an inscription as a couplet by poet Şinasi saying that the New Bridge was built by Abdülmecid Han. First to pass over the bridge was Sultan Abdülmecid, and the first to pass below it was the French captain Magnan in his ship the Cygne.

Toll
For the first three days crossing the bridge was free, after which a toll known as mürüriye was paid to the Naval Ministry. Toll collecting started on November 25, 1845. Toll was collected until May 31, 1930 by officials in white uniform standing on both ends of the bridge. Free : military and law enforcement personnel, fire fighters on duty, clergy.

The second bridge
This bridge was replaced by a second wooden bridge in 1863, built by Ethem Pertev Paşa on the orders of Sultan Abdülaziz (1861-1876) in readiness for the visit of Napoleon III to Istanbul.

The third bridge
In 1870 a contract was signed with a French company, Forges et Chantiers de la Mediteranée for construction of a third bridge, but the outbreak of war between France and Germany delayed the project, which was given instead to a British firm G. Wells in 1872. This bridge, completed in 1875, was 480 m long and 14 m wide and rested on 24 pontoons. It was built at a cost of 105,000 gold liras. This was used until 1912, when it was pulled upstream to replace the now genuinely old Cisr-i Atik Bridge.

The fourth bridge
The fourth Galata Bridge was built in 1912 by the German firm MAN AG for 350,000 gold liras. This floating bridge was 466 m long and 25 m wide. It is the bridge still familiar to many people today that was badly damaged in a fire in 1992 and towed up the Golden Horn to make way for the modern bridge now in use.

Today
Detail of the break in the overhead lines for the trams between one bascule (left) and the fixed part of the bridge. The Süleymaniye Mosque is in the background. The fifth Galata bridge was built by the Turkish construction company STFA just a few meters away from the previous bridge, between Karaköy and Eminönü, and completed in December 1994. It was designed and supervised by GAMB (Göncer Ayalp Engineering Company).

It is a bascule bridge, which is 490 m long with a main span of 80 m. The deck of the bridge is 42 m wide and has three vehicular lanes and one walkway in each direction. It has also recently had tram tracks added to it, allowing the Istanbul Tram to run from Zeytinburnu in the suburbs near Atatürk International Airport to Kabataş, a few blocks before Dolmabahçe Palace. This bridge, Trowse Bridge in Norwich, and a number of rail bridges in the United States may be the only movable bridges in the world which also carry electrified rail tracks.

It is a common argument that the bridge was not designed for this modification, which was added later as a necessity. Laymen had to make inspections of the bridge due to several engineering problems, which caused a setback of many years because of the discord between the supervisor and the contractor. The rest of the bridge including the market area in the first floor opened to common use in 2003.

Culture
The Galata Bridge was a symbolic link between the traditional city of Istanbul proper, site of the imperial palace and principal religious and secular institutions of the empire, and the districts of Galata, Beyoğlu, Şişli and Harbiye where a large proportion of the inhabitants were non-Muslims and where foreign merchants and diplomats lived and worked. In this respect the bridge bonded these two distinctive cultures. As Peyami Safa wrote in his novel, Fatih-Harbiye, a person who went from Fatih to Harbiye via the bridge set foot in a different civilization and different culture. Apart from its place in fiction, the romantic appearance of the Galata Bridge made it the subject of many paintings and engravings.

All daily city tours in Istanbul include this bridge as it is the passageway to the Old City. Panoramic view of the Golden Horn in Istanbul, as seen from the Galata Tower. The Galata Bridge can be seen in the center of the picture. The Seraglio Point (Sarayburnu) where the Topkapı Palace is located is seen at the left tip of the historic peninsula; followed by (left to right) the Hagia Sophia, the Sultan Ahmed (Blue) Mosque, the Yeni (New) Mosque near the Galata Bridge, the Beyazıt Tower rising high in the background, and the Süleymaniye (Süleyman the Magnificent) Mosque at far right, among others.

The Sea of Marmara and the Princes' Islands are seen in the background, on the horizon. At the extreme left of the picture, the district of Kadıköy (ancient Chalcedon) on the Asian side of the city can be seen.

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Tuesday, May 23, 2017

15 JULY MARTYRS BRIDGE

Bosphorus, İstanbul - Turkey

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The 15 July Martyrs Bridge, also called the First Bosphorus Bridge (Turkish: Boğaziçi Köprüsü or 1. Boğaziçi Köprüsü) is a bridge in Istanbul, Turkey spanning the Bosphorus strait (Turkish: Boğaziçi). The bridge is located between Ortaköy (European side) and Beylerbeyi (Asian side). It is a gravity anchored suspension bridge with steel pylons and inclined hangers.

The aerodynamic deck is hanging on zigzag steel cables. It is 1,510 m long with a deck width of 39 m. The distance between the towers (main span) is 1,074 m (World rank: 15th) and their height over road level is 105 m. The clearance of the bridge from sea level is 64 m. It was the 4th longest suspension bridge span in the world when completed in 1973, and the longest outside the United States of America.

History
The decision to build a bridge across the Bosphorus was taken in 1957 by Prime Minister Adnan Menderes. For the structural engineering work, a contract was signed with the British firm Freeman Fox and Partners in 1968. The bridge was designed by the famous British civil engineer Sir Gilbert Roberts who also designed the Humber Bridge, Severn Bridge, Forth Road Bridge, Auckland Harbour Bridge and the Volta River Bridge.

The construction started in February 1970, the ceremonies were attended by President Cevdet Sunay and Prime Minister Süleyman Demirel. The construction was carried out by the Turkish firm Enka Construction & Industry Co. along with the co-contractors Cleveland Bridge & Engineering Co. Ltd. (England) and Hochtief AG (Germany). 35 engineers and 400 men worked on the project.

It was completed on October 30, 1973, one day after the 50th anniversary of the founding of the Republic of Turkey, and opened by President Fahri Korutürk and Prime Minister Naim Talu. Ernest Frederick, a civil engineer working for the US government and stationed in Turkey at the time, was the first American to cross the bridge. American comedian and Ambassador for UNICEF Danny Kaye, dressed like a clown, followed him with a pack of Turkish children. As a huge crowd of people started to run after them, the bridge began to vibrate, and the crowd had to be held back to avoid any damage. The cost of the bridge amounted to USD 200 million.

Transportation
The highway bridge has a total width of eight lanes. Each direction has three lanes for vehicular traffic plus one emergency lane and one sidewalk. On weekday mornings, commuter traffic flows mostly westbound to the European part, so four of the six lanes run westbound and only two eastbound. Conversely, on weekday evenings, four lanes are dedicated to eastbound traffic and two lanes only to westbound. In the first four years, pedestrians could walk over the bridge, reaching it with elevators inside the towers on both sides.

No pedestrians or commercial vehicles like trucks are allowed to use the bridge today. Nowadays, around 180,000 vehicles pass daily in both directions, almost 85% being automobiles. On December 29, 1997, the one-billionth vehicle passed the bridge. Fully loaded, the bridge sags about 90 cm in the middle of the span.

Other uses
The Intercontinental Istanbul Eurasia Marathon, organized annually in October, starts from the Anatolian part of Istanbul, crosses the Bosphorus on the bridge and ends in the European part during which the bridge is closed to the vehicular traffic. Visitors to Istanbul in October can sign up for the 'fun run' at many points round the city and take the opportunity to cross the bridge by foot - many take picnics to enjoy the view. On a merrier point of view, it is a popular belief that a wish made while going under the bridge will come true.

Trivia
On May 15, 2005 at 7.00 local time, U.S. tennis star Venus Williams played a show game with Turkish standout İpek Şenoğlu on the bridge, the first tennis match ever to be played on two continents. The event was organized as a promotion ahead of the 2005 WTA’s Istanbul Cup and lasted five minutes only on the north side of the bridge. After the exhibition, they both threw a tennis ball into the Bosphorus.

On July 17, 2005 at 10:30 local time, British Formula One driver David Coulthard drove his Red Bull racing car on the bridge first from the European side to the Asian side, and then turning with a spectacular power slide at the toll plaza back to the European side for show. He parked his car in the garden of Dolmabahçe Palace where his ride had started.

During his ride to the Turkish Grand Prix at Istanbul Racing Circuit on August 21, 2005, David Coulthard was picked up by the automatic surveillance system and charged with a fine of 20 Euro when he passed through the toll booths without payment, as only the president, traffic police and emergency workers have the right to cross the bridge for nothing. His team accepted to pay for him. Since April 23, 2007, a fully computerized LED lighting system of changing colours illuminates the bridge at night.

On 15 July 2016, the bridge was blocked by a faction of the Turkish Armed Forces during a coup attempt.[19] The soldiers involved surrendered to police the next day. On 25 July 2016, prime minister Binali Yıldırım announced that the bridge would be renamed as the 15 Temmuz Şehitler Köprüsü (July 15 Martyrs Bridge).

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