The longest suspension bridge in the world-Akashi Strait Bridge in Japan was officially opened to traffic. Akashi Strait Bridge in Japan, located between Honshu Island and Shikoku Island, Kobe City and Awaji Island, has a main span of1991m (960+199/+960) and a total length of 391/kloc-0. The two main steel cables are 4000m each, with a diameter of1.12m. It consists of 290 thin steel cables and weighs about 50,000 tons. Akashi Strait Bridge is a suspension bridge with three spans and two hinged trusses. 180MP ultra-high strength steel wire is adopted for the first time, which reduces the diameter of the main cable and simplifies the connection structure. It is the main cable of the first suspension bridge and the first cable-stayed bridge across the valley built by incremental launching method, which was built by the famous French company Eiffel Group. The steel bridge is 283m, which is 333m higher. Width 35.5m, two-way six lanes, stiffening beam 14m. Its seismic strength is at the frequency of1150. It is designed to resist a strong earthquake of magnitude 8.5 and a rainstorm of 80m/s, with a return period of 150. It is the largest suspension bridge in the world at present. It crossed the Akashi Strait between Honshu Island and Shikoku Island in Japan, and finally realized the Japanese desire to build a series of bridges to connect the four islands, creating a new record in the history of bridge building in the world in this century. The total investment is about $4 billion. The bridge started in May 1988. Xihoumen Bridge,/kloc-0, completed in March, 1998, is a super-large sea-crossing bridge with the highest technical requirements among the five sea-crossing bridges connecting Zhoushan Island and Ningbo. The main bridge is a two-span continuous steel box girder suspension bridge, with a main span of1650m. It is the largest steel box girder suspension bridge in the world at present, with the second total length in the world and the first in China, but the length of steel box girder suspension cable is the first in the world. The designed navigation grade is 30,000 tons, and the service life is 100 years. Xihoumen Bridge is located in the typhoon-prone sea area, and the hydrological, geological and climatic conditions of the bridge site are complex. However, there is no practical precedent for building a long-span steel box girder suspension bridge in the vast sea area of typhoon area in China. All bridge builders insisted on innovation in concept, management and science and technology, implemented meticulous management, overcame difficulties and struggled hard, and overcame one difficulty after another. When "Weipa" in mid-September and "Rosa" in early October attacked Zhoushan, the maximum wind force measured on Xihoumen Bridge reached 13, which still stood safely, and the bridge successfully stood the test. The feasibility study report of "Key Technology Research and Engineering Demonstration of Super-long Span Steel Box Girder Suspension Bridge across the Sea", a national science and technology support project based on Xihoumen Bridge, has passed the evaluation of the expert demonstration meeting hosted by the Ministry of Science and Technology and the Ministry of Communications. On the morning of June 65438+February 16, 200710: 08, the steel box girder of Xihoumen Bridge 126 section of Zhoushan Island Roundabout Project was hoisted and connected. Up to now, Xihoumen Bridge is the longest steel box girder suspension bridge in the world. Dadai Bridge 1998 was completed and opened to traffic on June 14. The Great Belt Bridge is located between Funen Island and Xilan Island (where Copenhagen is located) in Denmark, with a total length of 17.5km. Daidai Bridge, also known as the Great Bolt Bridge and Stobolt Bridge, connects Xilan Island, where Copenhagen, the capital of Denmark, is located, and Feiying Island, where odense, the third largest city in Denmark is located. The bridge project consists of three parts: a railway tunnel crossing the East China Sea, an expressway viaduct and a highway-rail bridge. The highway bridge is a suspension bridge with a total length of 6.8km, with a main span of 1624m and 535m on each side. The bridge deck has four lanes, the tower is 254 meters high and the bridge deck is 75 meters above sea level. The stiffening beam is a flat steel box, which is transported to the bridge in sections and then hoisted and welded in place. The distance between the two islands is 18km. Based on the price of 1988, the actual cost of the Big Bell Bridge was 33.7 billion Danish kroner, about 4.8 billion US dollars, which was the highest budget bridge project in Europe at that time. The Dadai Bridge is divided into two sections, east and west, with Spo artificial island as the middle station. The west bridge is 6.6 kilometers long from France-Britain Island to Spock Island. Humber long-span suspension bridge of Humber Bridge. Across the Humber River in England. Located between Horsel on the north shore and Barton on the south shore. It was built in 1973 ~ 1980 and opened to traffic in July. The total length of the bridge is 2220 meters, the main span is 1, 4 10 meters, the north bank side span is 280 meters, and the south bank side span is 530 meters. The approach bridge is a reinforced concrete viaduct. The bridge tower is made of reinforced concrete hollow twin-tower columns connected by beams, with a height of155.5m, and slip-form construction is adopted. The main cable is composed of 14948 parallel cold-drawn galvanized high-strength steel wire with a diameter of 5 mm, and it is erected by overhead cable weaving method. The sling that hangs the stiffening beam from the main cable is an inclined steel strand. The anchor body of the main cable is a double-chamber concrete structure. The main cable is first supported by the cable saddle in the room, then dispersed into several strands and anchored in the anchor at the back of the room. The bridge deck is 28 meters wide, including 22 meters of roadway, and there are 3 meters of cantilever slab sidewalks and bicycle lanes on both sides. The stiffening beam is a steel box girder with a width of 22 meters and a height of 4.5 meters and a trapezoidal cross section. Each box girder precast section is 18. 1m long and consists of stiffened steel plates. The foundation of the north pier is a gravity reinforced concrete slab built on chalk soil, and the foundation of the south pier is two open caissons with a diameter of 24 meters built in clay 33 meters below the river bed. Open caisson construction adopts cofferdam island building method. It cost more than 250 million dollars. Jiangyin Yangtze River Highway Bridge is located on Xishan Mountain, 3200m east of Huangtian Port in Jiangyin City, Jiangsu Province, between Shiwei Village in Jingjiang City and Jiangyin City, with a main span of1385m (328+1385+295m) and a tower height of 190m. It is a portal frame structure composed of two reinforced concrete hollow towers and three beams, anchored by gravity. The beam is 3 meters high, the bridge deck is 29.5 meters wide, it has six lanes in both directions, and the tuyeres on both sides are 1.8 meters wide. 1999 was completed, which was a key construction project during the ninth five-year plan period. Jiangyin Yangtze River Highway Bridge, suspension bridge structure. The main span is1385m. Portal reinforced concrete tower column, height193m, with three beams inside. It is the fourth bridge in the world and the first bridge in China. 1994 started construction, and 1999 was completed and opened to traffic. 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. Jiangyin Bridge connects Shanghai-Nanjing Expressway in the south and Tong Ning Expressway in the north, passing through Jingguang Expressway and Xicheng Expressway. In 2002, the intercity bus was opened between Jiangyin and Jingjiang, and the residents of the two places became increasingly close.