Brief introduction of the fourth Nanjing Yangtze River Bridge?

The 4th Nanjing Yangtze River Bridge, located about10km downstream of the 2nd Nanjing Yangtze River Bridge, is the largest double-tower and three-span cross-border suspension bridge in China, ranking third in the world among similar bridges, and is known as "China Golden Gate Bridge", and the fourth cross-river highway bridge in Nanjing, with a total investment of over 6.8 billion yuan.

The fourth Nanjing Yangtze River Bridge is 28.996 kilometers long. Among them, the river-crossing bridge is about 5.448km long, with a north-south connection length of 2 1.86km, a main span of 1.4 1.8m, a deck width of 33m and six lanes in both directions. The whole line adopts the standard of six-lane expressway, the design speed is 1.20km/h, and the clearance width is arranged according to the single-hole two-way navigation of the representative fleet and 50,000-ton seagoing vessels.

201212 On February 24th, the 4th Nanjing Yangtze River Bridge was officially opened to traffic. Because it looks like the famous Golden Gate Bridge in San Francisco, it is known as "Golden Gate Bridge in China", but its main span is more than130m.

geographical position

The 4th Nanjing Yangtze River Bridge is the first three-span suspension bridge in China, which is known as "China Golden Gate Bridge". It starts at the intersection of Tong Ning Expressway east of Liang Heng Town in Liuhe District, crosses the Yangtze River via Longpao, connects with Shibu Bridge on the other side, and ends at Qilin Hub at the intersection of Shanghai-Nanjing Expressway, connecting with the southeast ring section of Nanjing Ring Expressway under construction, with a total length of 28.996 kilometers, of which the river-crossing bridge is about 5.448 kilometers long. The main span adopts the scheme of 14 18m three-span suspension bridge, and the whole line is designed according to the standard of two-way six-lane expressway. The design speed of river-crossing bridge is 100km/h, and the design speed of cross-strait wiring is120 km/h. There are four interchanges, namely, crossbeam, Longpao, Qixia and Qilin, and two interchanges, Hong Guang and Xianlin, are reserved, and two extra-large bridges, Chuhe and Qixia, are built.

In order to protect the environment and coordinate with the surrounding landscape, all the 8.8 km lines in Xianlin area are elevated, and the tunnel scheme is adopted when crossing Beixiangshan Mountain. The net height of the fourth Nanjing Yangtze River Bridge is not less than 50m, and the net width of the main navigation hole is 890m, which can accommodate 50,000-ton Panamanian ships.

work progress

On June 6, 2008, the foundation stone was laid for the fourth Nanjing Yangtze River Bridge.

On February 28th, 2008, at 65438, the main bridge of the 4th Nanjing Yangtze River Bridge was officially started.

On September 8 and 9, 2009, the south tower and the north tower of the fourth Nanjing Yangtze River Bridge successively completed the back sealing construction of the pile caps.

On February 4th, 2009, the south anchor of the 4th Nanjing Yangtze River Bridge started the construction of guide wall, and the excavation and lining of foundation pit officially started on August 2nd1day, and the foundation pit construction was completed on October 7th 165438.

The construction of the north anchor sand pile of the fourth Nanjing Yangtze River Bridge began in June 2008 at 5438+065438+ 10, and the construction of steel shell assembly and welding began in June 2009 at 65438+ 10. The first drainage settlement was completed on June 4th, the second drainage settlement was completed on July 24th, and the third settlement (without drainage) was completed on September 27th.

201010 On June 9, the fourth Nanjing Yangtze River Bridge held a cable tower capping ceremony, which marked that the main project of the fourth Nanjing Yangtze River Bridge was transferred to a new stage of superstructure construction ahead of schedule.

2011118, the fourth Nanjing Yangtze River Bridge successfully sailed across the river, and the catwalk was set up ahead of schedule on March 22nd.

On April 28th, 20 1 1, the erection project of the main cable strand of the fourth Nanjing Yangtze River Bridge was officially started, which marked that the superstructure construction of the fourth Nanjing Yangtze River Bridge entered a critical stage. 20 1 1 Main cable erection was completed on August, 2005 15.

20111On February 3rd, the fourth Nanjing Yangtze River Bridge started the mid-span hoisting of steel box girder.

201265438+1October 3 1, the closing ceremony of the steel box girder of the fourth Nanjing Yangtze River Bridge was held. On March 10, the welding of the steel deck of the main bridge was completed ahead of schedule.

On June, 2065438+2002 1 day, the steel deck pavement of the fourth Nanjing Yangtze River Bridge started, and it was all completed on August 24th.

2012113, Nanjing Yangtze river fourth bridge passed the handover acceptance and was officially handed over to Nanjing communications group for maintenance and charging.

201212 On February 24th, the 4th Nanjing Yangtze River Bridge was officially opened to traffic.

bridgework

The fourth Nanjing Yangtze River Bridge has a total investment of 6.86 billion yuan, and the whole line is designed according to the standard of two-way six-lane expressway. The design speed of river-crossing bridge is 100 km, and the design speed of cross-strait wiring is 120 km. Different from the Nanjing Yangtze River Bridge No.2 and No.3, which have been completed and opened to traffic, the Yangtze River Bridge No.4 is the largest cross-border suspension bridge with two towers and three spans in China. Its appearance is similar to the Golden Gate Bridge in San Francisco, USA, but its main span is1418m, which is more than130m longer than the Golden Gate Bridge, ranking third in the world among similar bridges.

According to the planning, the fourth Nanjing Yangtze River Bridge is located about 10 km downstream of the second Nanjing Yangtze River Bridge, starting from the crossbeam interchange on the east side of Liang Heng Town of Tong Ning Expressway on the north bank of the Yangtze River, passing through Hong Guang Village East, Hongshan Yaodong and Longpao Town West to the south, and crossing the Yangtze River near Shibu Bridge. Cross beijing-shanghai railway and Jiuxiang River in Qixia District, and then go east to south along Jiuxiang River. According to the overall planning of Nanjing, the reserved passage is routed, passing through the east side of Xianlin University Town, ending at Qilin Hub where the route intersects with Shanghai-Nanjing Expressway, and bypassing the southeast end of the expressway according to the planning. The total length of the line is 28.996 kilometers, and the construction period is 5 years. The foundation stone was laid on June 6th, 2008+10/October 6th, and the approved construction period was five years. The 4th Nanjing Yangtze River Bridge was officially opened to traffic on February 24th, 20 12+65438.

2065438+February 8, 2003 officially opened the bus.

Cable system

This bridge scheme is a three-span suspension bridge, and the main cable span is (166+410.2)+1418+(363.4+18.4) = 2476. The theoretical intersection elevation of the main cables at the top of the tower is 234.2m, the lowest elevation of the center line of the main cables is 234.2m- 157.50m=76.7m, and the vertical span ratio of the main cables is 1/9.003. The main cable is composed of high-strength galvanized parallel steel strands (PPWS). In each main cable, there are 135 long strands from the north anchorage to the south anchorage, and another 6 strands are arranged in the north span and anchored on the north main saddle; Eight back cables span the south side and are anchored on the main cable saddle on the south side. Each strand consists of 127 high-strength galvanized steel wire with a diameter of 5.35 mm.

The suspension cable system of the bridge adopts the structural scheme of pin hinge sling and cable clamp, and the sling is connected with cable clamp and steel box girder (transition pier) by pin hinge. The stiffening girder of the whole bridge has (26+89+23)×2=276 lifting points, each with two slings.

201212 February 10 news, the fourth Nanjing Yangtze River Bridge will be officially opened to traffic on 201213 February, and various preparations are under way before opening to traffic. Nanjing Yangtze River Fourth Bridge is the largest suspension bridge with two towers and three spans in China, with a total investment of 6.86 billion yuan and a total length of nearly 29 kilometers. The whole line is built according to the standard of two-way six-lane expressway, of which the river-crossing bridge is about 5.5 kilometers long.

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