Nanjing Second Yangtze River Bridge

Nanjing Baguazhou Yangtze River Bridge

synonym

Nanjing Second Yangtze River Bridge generally refers to Nanjing Baguazhou Yangtze River Bridge

Nanjing Baguazhou Yangtze River Bridge, referred to as Baguazhou bridge, formerly known as the second Nanjing Yangtze River Bridge

It is a cable-stayed bridge across the Yangtze River in Nanjing City, Jiangsu Province, China. It is a key construction project of China's ninth five year plan

It is an important part of Nanjing Luoyang Expressway (g36)

When completed, it is the third largest cable-stayed bridge in the world and has the reputation of "the first cable-stayed bridge in China"

Nanjing Baguazhou Yangtze River Bridge started the preparatory construction of the project on January 23, 1992, officially started construction on October 6, 1997, and was completed and opened to traffic on March 26, 2001. It is named Nanjing Yangtze River second bridge

On December 20, 2019, it will be renamed Nanjing Baguazhou Yangtze River Bridge

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Nanjing Baguazhou Yangtze River Bridge connects Nanjing Ring Expressway in the South (National Expressway G25 < sub03 < / sub) and Ning Huai highway in the north

The total length of the bridge is 21.337 km. The bridge deck is a two-way six lane Expressway with a design speed of 100 km / h

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Construction process

On January 23, 1992, Nanjing Baguazhou Yangtze River Bridge officially started the preliminary construction of the project

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On May 28, 1993, the State Planning Commission of China approved the project proposal

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On November 29, 1996, the bridge construction headquarters was officially established

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On January 19, 1997, the South lead of Nanjing Baguazhou Yangtze River Bridge was started. On March 7, the State Planning Commission of China approved the feasibility study report of the project. On April 17, China's Ministry of Communications approved the preliminary design of the project. On September 23, the State Planning Commission approved the project commencement report. On October 6, the bridge was officially started. On December 14, the steel cofferdam of the South Main Pier of Nancha bridge was laid

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On January 7, 1998, the steel cofferdam of the North Main Pier of Nancha bridge was laid. On January 13, the construction of Beicha bridge began. On February 17, the steel cofferdam of the South Main Pier of Nancha bridge touched rock. On March 11, the steel cofferdam of the North Main Pier of Nancha bridge touched rock. On April 11, the steel cofferdam of the South Main Pier of Nancha bridge was sealed. On April 27, the steel cofferdam of the North Main Pier of Nancha bridge was successfully sealed. On August 27, the pile foundation of South Main Pier of Nancha bridge was completed. On September 27, the pile foundation of the North Main Pier of Nancha bridge was completed. On October 21, the South lead line completed the acceptance. On November 30, the south line was completed and opened to traffic

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On April 16, 1999, the construction of the pylon of Nancha bridge began. On June 14, the pile foundation of Beicha bridge was completed. On October 9, the South Pylon of Nancha bridge was capped. On October 16, the North Pylon of Nancha bridge was capped. On December 5, the steel box girder floating crane of Nancha bridge began

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On February 20, 2000, the first pair of steel box girder of Nancha bridge was suspended successfully. On April 23, the lower part of Beicha bridge was completed and cantilever casting construction began. On May 26, the southern span of Nancha bridge was closed. On June 2, the northern span of Nancha bridge was closed. On July 9, the main span of Nancha bridge was closed. On August 21, Beicha bridge was closed. On September 22, the paving of epoxy asphalt concrete on the steel deck of Nancha bridge began. On October 14, the steel deck of Nancha bridge was paved with epoxy asphalt concrete. On November 25, asphalt concrete pavement of Beicha bridge was completed and Baguazhou bridge was completed

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On January 12, 2001, the static load test of Nancha main bridge was completed. On January 13, the static load test of Beicha main bridge was completed. On January 14, the dynamic load test of Beicha main bridge was completed. On March 18, the bridge passed the acceptance. On March 26, the bridge was completed and opened to traffic

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On June 22, 2002, the bridge passed the completion acceptance organized by the Ministry of communications of the people's Republic of China

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From April 15, 2019 to May 11, 2019, some lanes of Nanjing Baguazhou Yangtze River Bridge were closed due to construction. One lane of the construction section was closed from 07:00 to 19:00 in the daytime, and two lanes of the construction section were closed from 19:00 to 07:00 in the morning

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On December 20, 2019, the bridge was renamed Nanjing Baguazhou Yangtze River Bridge

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Bridge location

Nanjing Baguazhou Yangtze River Bridge is located in Nanjing City, Jiangsu Province, China. It is an important part of Nanjing Luoyang Expressway (National Expressway g36). It connects Nanjing Ring Expressway (National Expressway G25 < sub01 < / sub) in the South and Nanjing Huaihe highway in the north. It is located 11 kilometers downstream of Nanjing Yangtze River Bridge

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bridge design

Bridge structure

Nanjing Baguazhou Yangtze River Bridge is composed of the South and North Branch bridges and the south bank, Baguazhou and north bank leads

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Nancha Bridge

The main bridge foundation of the Yangtze River Bridge South Branch Bridge in Bagua Zhou, Nanjing is constructed by double wall steel cofferdam with an outer diameter of 36 meters, an inner diameter of 33 meters, and a double wall spacing of 1.5 meters. The height of the north and South steel cofferdams is 53.23 meters and 65.5 meters respectively, and the bottom of the steel cofferdam is 25 underwater concrete with an effective thickness of 8 meters. 21 large diameter bored piles with a diameter of 3 meters are used for the pile foundation of the north and South towers, and the pile lengths are 102 meters and 83 meters respectively, with No. 30 concrete pouring. The bearing platform is 6m thick reinforced concrete. The cable tower is a diamond shaped reinforced concrete cable tower. The lower tower column is a bi-directional variable cross-section, and its size changes from 12 × 7m to 8.013 × 4.785m. The middle and upper tower columns are 7.0 × 4.5m in equal cross-section. The cross beam is prestressed reinforced concrete, and the upper tower column is set with circumferential prestress. The main tower is 195.41m high, and the building height is nearly 300m. The main beam is composed of 93 steel box girders suspended, assembled and welded on site. The steel box girders are first made into plate units in the factory, assembled into standard sections in the steel box girder pre assembly site, and transported to the bridge site by water vessels. 36 steel box girders are pre hoisted in place by large floating cranes, and the rest are hoisted by bridge deck hydraulic cranes. In addition to the U-rib joint of the upper roof, the steel box girder segments are connected by high-strength bolts, and the rest are all welded. There are 160 stay cables in the whole bridge of Nancha bridge, which are composed of 7 galvanized parallel steel wires with high strength and low relaxation. The longest cable is 330 meters, and there are 265 steel wires, weighing 30 tons. The bridge deck is directly paved on the steel plate with 5cm epoxy asphalt concrete. The foundation of approach bridge of Nancha bridge is bored pile, the bearing platform is separated rectangular bearing platform; the pier body is thin-walled pier; the bearing is basin type rubber bearing; the upper prestressed concrete continuous box girder is separated up and down, and the prestress adopts two-way group anchor prestress system

 

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Beicha Bridge

The Beicha bridge of Nanjing Baguazhou Yangtze River Bridge is a five span continuous prestressed continuous girder bridge with a main span of (90 + 3 × 165 + 90) m and a length of 2172 m, ranking first in Asia among the similar bridges. The bored pile diameter of Beicha main bridge is 2.5m; the main pier bearing platform is an integral high pile rectangular bearing platform, and the side pier bearing platform is a separated high pile bearing platform; the pier body is a separated thin-walled pier; the bearing is a basin type rubber bearing; the upper prestressed concrete continuous box girder is separated up and down, and is a three-way prestressed system. The foundation of the North Branch approach bridge is 1.5m or 1.8m bored pile; the bearing platform is a separated rectangular bearing platform; the pier body is a column pier or thin-walled pier; the bearing is a basin type rubber bearing; the upper prestressed concrete continuous box girder is a two-way prestressed system with up and down separation. The abutment is rib embedded abutment

 

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Lead and ancillary works

The south bank lead of Nanjing Baguazhou Yangtze River Bridge starts from dongyangfang interchange of phase I ring road in the south, passes through Yangfang mountain, Shanghai Nanjing railway and Ningqi highway, passes through Yaohua quarry, then successively passes through yaoyan highway and Guanji Benxi special railway, crosses Weiyi road and local special railway on Liutang, and connects Nanjing Baguazhou bridge south approach at xiamiao village in the north. The whole line is 5.1km long. The project is a fully closed, two-way six Lane interchange expressway. The design speed is 100 km / h, the design load of bridge and culvert is grade-20, the hanging load is grade-120, and the width of subgrade is 33.5 M

 

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As an important part of Nanjing Baguazhou bridge, the north bank lead of Nanjing Baguazhou Yangtze River Bridge connects Yongliu Expressway and the extended Ningyang first-class highway with the main bridge of the North Branch of the bridge, and reserves an interface for national highway 104. The project starts from the West Bank of Macha river of Yong Liu Expressway in the north, crosses the special railway of Yeshan Iron Mine of Nangang in the south, passes Xinhua East Road of Liuhe District, crosses civil air defense project of catalyst plant of Nanhua chemical company, steam and gas pipelines and Dawei Road, and ends at the North approach abutment of Beicha bridge. The total length of the line is 3.715km, which is a fully closed, full interchange two-way six lane expressway. The design speed is 100 km / h, the design load of bridge and culvert is more than grade-20, the trailer is 120, and the width of subgrade is 33.5 M

 

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The Baguazhou lead line of Nanjing Baguazhou Yangtze River Bridge starts from the South abutment of Beicha bridge, successively passes through Xiaojiang River, Zhongxin River and Yuejin River, and finally ends at the North abutment of Nancha bridge, with a total length of 5.698 km

 

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Design parameters

Nanjing Baguazhou Yangtze River Bridge, 21.337 km long, is composed of three sections of leading lines and two bridges at the South and North branches. Among them: the South Branch is large

Chinese PinYin : Nan Jing Zhang Jiang Er Qiao