Detailed data collection 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.

Chinese name: mbth of jiangyin Yangtze river bridge: length of jiangyin Yangtze river bridge: 30765438+ 0m bridge type: extra-large steel box girder suspension bridge beam construction time:1994165438+ 1 October 22nd opening time: 65438+1 September 28th, 1999 Location: Jingjiang District, the north bank of Jiangyin City, Jiangsu Province: East China Bridge Width: 33.8m Achievements: The fourth largest steel overview Deck laying, significance, management and maintenance, expert comments and bridge overview Jiangyin Yangtze River Bridge is located between Jiangyin City and Jingjiang City, Jiangsu Province, China, and is a planned coastal north-south trunk line crossing. 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 Bridge Jiangyin Yangtze River Highway Bridge is the first large-scale steel box girder suspension bridge with a span of over 1,000 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 * * * wrote an inscription and cut the ribbon for the bridge. Difficulties in Construction of Jiangyin Yangtze River Bridge Although 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 bridge construction process, which are briefly described as follows: the north and south anchor ingots of the north anchor caisson bridge should "pull" the main cable of the bridge together, and the tension of the main cable is 64,000 tons, while the north anchor ingot is located on the alluvial plain. The plane size of the underground caisson is 69 meters long and 5 1 m wide, with an area as large as 10 basketball courts. Sinking needs to go through four different layers of soil. The main cable is the main load-bearing component of Jiangyin Bridge, with a total weight of 1.8 million tons of steel deck and 5000 tons of asphalt pavement, as well as 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. 5cm 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. Meaning 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 large temperature difference steel box girder pavement and north anchor caisson. 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. Principles of management and maintenance: scientific maintenance and simultaneous management and maintenance. Maintenance policy: safety and smoothness, 1. Establish and constantly improve the corresponding bridge maintenance manual. 2. Pay attention to the application and management of "four new" technologies, and comprehensively improve the technical conditions of bridges. 3. Carry out some forward-looking research projects, technological innovation and application of achievements. 4. Promote the information construction of bridges. 5. Pay attention to the cultivation of maintenance team. Continuously improve the maintenance level. Experts comment on what long-span suspension bridge to build? Jiangyin Yangtze River Highway Bridge is a steel suspension bridge with a span of1.385m, ranking first in China and fourth in the world. Zhou Shizhong, deputy commander of Jiangyin Bridge Construction Command, said that1.385m is not a deliberate arrangement, but a scientific decision. The existing Xishan Bridge of Jiangyin Yangtze River Bridge has a river surface of only 1.4km, so it is the most economical to build the bridge here. At that time, I also considered building a tunnel. Because the Xishan River in Jiangyin is very narrow and the water potential is very fast, it is best not to set piers in the middle of the river to facilitate boating and flood discharge. The geological section shape of the riverbed in Jiangyin section of the Yangtze River is not stable, the tunnel construction cost is too high, and the future maintenance cost is also high, which determines the bridge construction scheme. It is also repeatedly demonstrated between cable-stayed bridges and suspension bridges. The original cable-stayed bridge scheme is 600 meters span. This type of bridge must have a main tower built in the middle of the river, and the transition tunnel has four or five piers, which will inevitably affect the river regime. When the suspension bridge was initially determined, there were three spans: 1000m, 1200m and1385 m. Because the first two spans still can't solve the problem of pier and abutment in water, the span of 1385m is finally chosen. Now the south tower of Jiangyin Bridge is on the hillside of Xishan Mountain, and the north tower is on the north bank, with a water depth of only 65,438+. Jiangyin Yangtze River Bridge can resist the wind speed of 49 meters per second, and the earthquake has a 7-level fortification. Professor Lin Zhixing of Tongji University said that Jiangyin Bridge is a flexible bridge with a span of more than 1.300 meters, which means it is easy to vibrate when encountering strong winds. 1940, the American Tacoma Bridge, with a span of more than 840 meters, was twisted into a pile of ruins in an eight-level gale (19 meters per second) three months after its completion. Therefore, technically, we adopt a box beam with good stability, and make the section of the box beam into a "tuyere shape" with a thick middle and thin two ends. This box beam is similar to a streamlined box beam to reduce air resistance, and at the same time, guide plates are arranged on both sides of the box beam. The highest surface wind speed recorded in Jiangyin is 18m per second, which is equivalent to 28m on the bridge deck in the air. In Tongji Wind Tunnel Laboratory, a model of Jiangyin Bridge was built according to the ratio of1135 to simulate the local terrain conditions. In the wind tunnel laboratory, the limit wind speed of Jiangyin Bridge reaches 49m per second (equivalent to 15). Zhou Shizhong said that the seismic load of long-span bridges is also an important consideration. Not only the horizontal and vertical vibration, but also the vibration of two towers in different directions should be considered. The bridge site of Jiangyin Xishan Bridge is far from the geological fault zone, and the probability of an earthquake of magnitude 7 or above is very small. Through a lot of calculation and analysis, Jiangyin Bridge is still fortified at level 7. Deng, a professor at Southeast University, said that the weight of Jiangyin Bridge will increase by 1000 tons for every centimeter of pavement thickness. In order to reduce the weight of the bridge by thinning, the design load of Jiangyin Bridge deck is 5000 tons, so the pavement can only be 5 cm. However, problems such as thin pavement, no cracking at low temperature and no deformation at high temperature will follow. We use Tobago natural lake asphalt with stable chemical composition and good cohesiveness, and adopt advanced pouring method for paving, which ensures that the bridge deck is not easy to crack in winter and deform in summer. At the same time, in order to make the road surface have considerable friction and ensure that the vehicle can brake safely at high speed. So a layer of high-strength lava was sprinkled on the asphalt layer, which not only increased the friction of the road surface but also strengthened the ability of the road surface to absorb vibration. The road surface looks rougher than the highways in the province, but the vehicles feel soft when driving.