Introduction of Jiangyin Yangtze River Bridge?

Jiangyin Yangtze River Bridge is located between Jiangyin City and Jingjiang City, Jiangsu Province, China, which is the planned location of the coastal north-south trunk line crossing the Yangtze River. Jiangyin Yangtze River Highway Bridge is the first large-scale steel box girder suspension bridge with a span of more than 1000 meters in China. It is also a large-scale steel box girder suspension bridge "the first in China and the fourth in the world" in the 20th century. It is the "throat" project of Tongjiang-Sanya national highway trunk line and Beijing-Shanghai national highway trunk line. It is the second bridge across the Yangtze River in Jiangsu Province. The total length of the bridge is 307 1 m, and the bridge deck is designed according to the standard of six-lane expressway, with a width of 33.8 m.

Overview of bridges

Jiangyin Yangtze River Bridge is located between Jiangyin City and Jingjiang City, Jiangsu Province, China, which is the planned location of the coastal north-south trunk line crossing the Yangtze River. The bridge type scheme is a long-span suspension bridge with a mid-span of 1386m, which is the first bridge in China with a span exceeding 1000 m and a total length of nearly 3km. The bridge deck is arranged as a standard two-way six-lane expressway, with central separation zone and emergency parking zone, and sidewalks with the width of 1.5m are set on both sides of the river-crossing part of the main bridge. The main span bridge is a flat steel box girder structure with tuyeres, with a box height of 3m and a total width of 37.7m The vertical span ratio of a pair of cables is110.5, and it is composed of φ5 galvanized high-strength steel wires, and it is erected by parallel steel beam method (PWS method). The net navigation height under the bridge is 50m. The height of the bridge tower is 182.39m, which is a portal reinforced concrete structure. The South Tower is located on a rocky foundation on the south bank. The north tower is located in the shallow water area outside the north bank, and the island-type pile foundation is adopted. South anchorage is a gravity rock-socketed anchorage structure. The north tunnel is composed of multi-span prestressed continuous rigid frame. The north-south approach bridge is a prestressed concrete beam bridge with the length of 132m and 1365m respectively.

Jiangyin Yangtze River Highway Bridge is the first large-scale steel box girder suspension bridge with a span of more than 1000 meters in China. It is also a large-scale steel box girder suspension bridge "the first in China and the fourth in the world" in the 20th century. It is the "throat" project of Tongjiang-Sanya national highway trunk line and Beijing-Shanghai national highway trunk line. It is the second bridge across the Yangtze River in Jiangsu Province.

The total length of the bridge is 5. 176 km, with a total investment of 3.625 billion yuan. The total length of the bridge is 307 1m, the tower 197m, the diameter of two main cables is 0.870m, the bridge deck is designed according to the standard of six-lane expressway, the width is 33.8m, and the designed driving speed is100 km/h; The clear navigation height under the bridge is 50 meters, which can meet the navigation requirements of 50,000-ton ships. The bridge/kloc-0 started construction on October 22nd, 1994, 165438, and was completed and opened to traffic on September 28th, 1999. Comrade Jiang Zemin inscribed the name of the bridge and cut the ribbon for its opening.

work progress

Construction difficulty

Even if there have been successful examples of suspension bridges abroad, due to the unique geological, hydrological and climatic conditions in Jiangyin and Jingjiang areas, foreign experience cannot be completely copied. There are still many technical difficulties in the process of bridge construction, which are briefly described as follows:

North anchor open caisson

The north and south anchors of the bridge should pull the main cable of the bridge together. The Zhang Liwei of the main cable is 64,000 tons, while the anchor in the north is located on the alluvial plain. The plane size of underground open caisson is 69 meters long and 5 1 m wide, with an area as large as 10 basketball courts. If it sinks, it will pass through four different layers of soil, which may cause serious problems such as skew and distortion. The sinking process is as long as 20 meters.

Main cable erection

The main cable is the main load-bearing component of Jiangyin Bridge, with the total weight of steel deck10.8 million tons, the total weight of asphalt pavement 5,000 tons, and live traffic load. There are two main cables of Jiangyin Bridge, weighing 8,400 tons, consisting of 169 strands, each of which weighs 50 tons. The main cable is erected by precast parallel strand method (PPWS), and 50-ton and 2200m-long strands are erected in the air. From traction, stretching, molding to cable adjustment, each link has many unforeseen technical difficulties, and it belongs to aerial work, which has a great impact on the weather, and its erection difficulty is unique in China.

Bridge deck pavement

5 cm thick asphalt concrete is laid on the deck of steel box girder. Because of the strong thermal conductivity of steel box girder, the temperature is very high in summer and very low in winter, it is difficult to give consideration to the characteristics of asphalt. However, the temperature conditions in Jiangyin are worse than those in western countries, ranging from-15℃ to 70℃. There is no precedent. After more than a year of research and experiment, we finally found a scheme that can meet the specific requirements of Jiangyin Bridge and solved this world problem.

Important significance

Jiangyin Yangtze River Bridge is also one of the top ten famous bridges in the world, ranking fourth in span. Jiangyin Yangtze River Highway Bridge is the first super-large suspension bridge with a span of more than 1000 meters in Jiangsu traffic system construction. Among the bridges built at that time, it ranked first in China and fourth in the world, representing the highest level of bridge construction in China. It is a new milestone in the history of bridge construction in China in the 20th century and ranks among the top bridges in the world. Jiangyin Yangtze River Highway Bridge has broken through many world-class problems in engineering technology, such as steel box girder pavement with large temperature difference and sinking of open caisson in the north. Some technologies have provided good experience for world-class bridges such as the Second Yangtze River Bridge, the Third Yangtze River Bridge, Runyang Bridge and Sutong Bridge.

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