Nanjing eye

Nanjing eye is located in the central axis of the Youth Olympic axis of Hexi New Town, Jianye District, Nanjing city. It is the first sightseeing pedestrian bridge on the Yangtze River, crossing the Jiajiang river of Nanjing Yangtze River. It starts in Hexi youth culture and sports park and ends in Jiangxinzhou youth forest park. It is a new landmark of Nanjing and a new scenic spot of Nanjing.

Nanjing eye pedestrian bridge

synonym

Nanjing eye generally refers to Nanjing eye pedestrian bridge

Nanjing eye footbridge is a bridge connecting Jiangxinzhou and Hexi on the Jiajiang waterway of the Yangtze River in Jianye District, Nanjing City, China. It is the first sightseeing footbridge on the Yangtze River. It has the characteristics of traffic and landscape

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Nanjing eye pedestrian bridge started construction on January 15, 2013

The main tower pile foundation construction was completed in March 2013, the steel tower capping and steel box girder closure were completed in the middle of December 2013, the stay cable installation was completed at the end of January 2014, and it was completed and put into use on August 16, 2014

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Nanjing eye pedestrian bridge starts from Jiangxinzhou Youth Olympic Forest Park in the north and ends at Nanjing International Youth Culture Center in the south

With a total length of 827.5 meters, it is famous for its unique shape at home and abroad

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Construction process

In 2011, the architectural design of Nanjing International Youth Culture Center started the international bidding. The design of Nanjing eye pedestrian bridge initially adopted the scheme given by Zaha Hadid, a design firm of Zaha: single arch design, 150 meters high, three-story high-altitude observation platform at 138 meters, 141 meters and 144 meters respectively, with vertical traffic system, three steel structures and one view. The bridge structure is divided from inside to outside For the transportation of pods, glass and steel structures, the lowest floor of the footbridge is equipped with an office and an entrance to the high-altitude viewing platform. Due to the difficulty of construction and large capital investment, the design height of the bridge will be reduced by two-thirds, the single arch structure will be adjusted to double arch symmetrical structure, and the high-altitude viewing platform and vertical traffic system will be cancelled

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On January 15, 2013, the construction of pedestrian bridge for Nanjing Youth Olympic Games started

The closure was completed on December 18

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On May 31, 2014, the original Nanjing Youth Olympic Games pedestrian bridge was named "Nanjing eye pedestrian bridge"

On August 16, Nanjing eye pedestrian bridge was put into use

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In 2016, the Olympic rings logo of Nanjing eye pedestrian bridge was removed

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In May 2016, "Nanjing eye" pedestrian bridge replaced the original Olympic ring landscape with the emblem of Nanjing 2014 Youth Olympic Games.

Bridge location

Nanjing eye pedestrian bridge is located in the central and southern part of Jianye District, Nanjing City, Jiangsu Province, China. It crosses the Yangtze River tributary Jiajiang waterway on the central axis of the Youth Olympic axis. It starts from the youth Forest Park of Jiangxinzhou street in the north and ends at the Nanjing International Youth Culture Park of Shuangzha street in the south. It is about 200 meters away from the Yangtze River Tunnel of Dinghuaimen in the upstream of Nanjing

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Architectural design

building structure

Design concept

Nanjing eye pedestrian bridge is a dynamic and smart bridge. Most of the ancient bridges in the south of the Yangtze River in China are stone arch bridges, and the eyes of Nanjing are slightly arched, which is in line with the Chinese classical poetry of small bridges and flowing water people. The appearance of the whole bridge is simple and elegant, and the two white rings are both relative and separated, which is very dynamic. The bridge is like a ripple, from wide to narrow, from narrow to wide. Pedestrians walk through it like notes jumping on the strings. The two white rings support the whole weight of the bridge, the oval tower implies completeness, and the steel bone shows a modern sense. From afar, the two white rings are like a white jade belt tied on the Jiajiang River, connecting the new city and the river center, and the urban framework extends westward. From a closer look, the steel cables on both sides of the white ring, like wings, flutter upward, like the strings of a harp. The two towers are like the thumbs of two good friends. One says that the new town is full of vitality, and the other boasts that the Youth Olympic athletes are full of vitality

 

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Design features

Nanjing eye pedestrian bridge is a steel box girder cable-stayed bridge with double pylons and double cable planes. The pylon is an inclined oval structure. The lower part of the lower cross beam is solid reinforced concrete pylon, and the upper part is steel pylon

 

The steel box girder adopts a widened structure, which can not only meet the traffic demand, but also reserve space for sightseeing photos and major festivals. Taking the bridge tower as the urban landscape node of the Youth Olympic axis, instead of the concept of landmark construction, fully embodies the concept of thrifty Olympic Games. As a tourist link between the two sides of the Strait, the bridge is mainly composed of tourist battery cars and pedestrians, and the design of the bridge deck cancels the traffic requirements of motor vehicles

 

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Each ring of Nanjing eye pedestrian bridge that falls into the river falls on a base of 650 square meters underwater. The base is connected with nearly 100 steel pipe piles with a diameter of 1.7 meters. The weight of the whole bridge is supported by these steel pipe piles, and the steel pipe is directly inserted into the river bottom more than 50 meters deep. In order to hide the two bases, when the lowest point of the oval shape is set, the lower part of the double ring is buried below the lowest water level of the Yangtze River, so as to ensure that the base of the bridge does not come out of the water at each water level. Three quarters of the ring structure is made of steel, and the part in contact with the river surface is made of concrete, which can effectively prevent the double ring from rusting. Twelve dampers are installed in the mid span area of Nanjing eye pedestrian bridge to buffer the instantaneous pressure on the bridge body and avoid the hidden danger of resonance

 

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Design parameters

As of December 2014, Nanjing eye pedestrian bridge has a total length of 827 meters, of which the main bridge is 531.5 meters long, the main span is 240 meters, the approach bridge is 296 meters long, the deck width is 10 meters to 22 meters, the cable tower inclines 35 degrees to the shore side, the vertical height of the tower is 82.5 meters, and the inclined height of the tower is 102.464 meters

 

. There are 36 stay cables in the whole bridge, and the weight of the whole bridge is more than 4800 tons; the load weight per square meter of the bridge deck is 0.35 tons, and the whole bridge can accommodate nearly 40000 people; the Olympic five ring sign in the center of the bridge is 13 meters long, 7 meters high, and 0.8 meters wide, and its internal steel plate is tightly engaged with the bridge, with the weight of 7 tons, and it can resist the strong wind of level 12

 

. The bridge meets the requirements of 12 meters clear height for navigation and 4.5 meters clear height for embankment

 

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Equipment and facilities

lighting

Nanjing eye pedestrian bridge chooses cable tower, steel box girder and deck railings as lighting elements, and sets floodlights on the deck to illuminate the cable tower, so as to achieve the effect of full body transparency of the steel tower. At the same time, the wall washing lamp is used to illuminate the wind nozzle of the steel box girder, outline the main beam alignment, and connect the two full body transparency cable towers. The LED light band is embedded in the steel handrail to replace the light pole lighting, which not only meets the functional lighting of the bridge deck, but also gives consideration to the landscape effect

 

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The landscape lighting of Nanjing eye pedestrian bridge is divided into weekday mode, holiday mode and special celebration mode. On weekdays, the white cable tower floodlight, steel box girder wind nozzle wall washing light and bridge deck railing light are turned on; on the basis of weekdays, the cable tower floodlight is turned into color in holiday mode to create the streamer effect of steel tower; on the basis of holidays, the laser light is turned on in special celebration mode to create the dynamic effect of flower rope

 

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Guardrail facilities

There are two layers of handrails on both sides of Nanjing eye pedestrian bridge. The first layer is higher for ordinary adults, and the second layer is lower for children or disabled people in wheelchairs

 

. Railings not only ensure the landscape effect, but also embody the people-oriented, equal and fraternal spirit

 

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Operation

As of July 31, 2014, the daily tourist volume of Nanjing eye pedestrian bridge has reached tens of thousands of people

 

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On April 27, 2019, Nanjing eye pedestrian bridge was opened to bicycles for the first time

 

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Construction achievements

Technical problems

The construction of Nanjing eye pedestrian bridge overcomes many difficulties, such as the lack of pile driving boat that can meet the pile sinking energy of the bridge and pass through the Nanjing Yangtze River Bridge, the navigation height limit of the Yangtze River, the inaccessibility of large floating cranes, and the difficulty in lifting steel tower segments. The large floating crane can only enter the construction water area from the upstream, which is restricted by the steel box girder support and temporary trestle. When the steel tower is installed, the floating crane can only be located at the upstream side of the bridge, so the floating crane lifting operation is very difficult. The installation of steel tower is not only constrained by the boundary conditions such as steel box of main pier bearing platform and steel box girder in tower area, but also constrained by the tower section itself, especially the hoisting of T6 at downstream side. The floating crane has to cross the upstream steel tower section, the hoisting range is more than 50 meters, and the hoisting height is nearly 80 meters. In addition, the steel tower was installed just in the dry season of the Yangtze River, and the measured lowest water level dropped to the historical 20-year return period, which increased the difficulty of hoisting

 

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Nanjing eye pedestrian bridge needs to realize the integration of two completely different materials after setting the splicing scheme of steel structure and concrete. Considering the durability and preventing steel corrosion, the splicing position is set above the highest flood level of the river. At the same time, the firmness of the steel-concrete connection should be considered. The seamless butt joint between the steel ring and the concrete ring can be realized by welding nails, opening plates, pressure plates and prestressed tendons. Finally, the unified painting can not see the splicing trace of the double rings with naked eyes, so as to achieve the integrated effect

 

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Honorary recognition

From June 7 to 11, 2015, at the 32nd International Bridge Congress held in Pittsburgh, Pennsylvania, USA, Nanjing eye pedestrian bridge was awarded by Arthur