Which Japanese Seto Bridge is the longest bridge in the world?

Bridge, as the name of the river-crossing building, began in the literature of the Western Han Dynasty. Do you know which is the longest bridge in the world? The following is the longest bridge in the world that I sorted out. Welcome to reading.

The longest bridge in the world is: Seto Bridge in Japan Seto Bridge is a bridge between Honshu (Kurashiba City, Okayama Prefecture) and Shikoku (Sakura City, Kagawa Prefecture) in Japan. It spans the Seto Inland Sea and belongs to one of the three routes connecting Honshu and Shikoku. The whole bridge is composed of several suspension bridges, skew Zhang Qiao and girder bridges, forming a spectacular bridge group. The bridge started in June1978+1October 10, and the construction took nearly 10 years. It was not fully opened to traffic until April 1988. The bridge is a highway-railway bridge, with four lanes in expressway (Seto central automatic lane) on the upper floor and the Seto Bridge line in JR Shikoku on the lower floor.

Seto Bridge took 40 years and invested a lot of money to build. It connects two islands in Okayama Prefecture of Honshu with Sakaguchi Island in Kagawa Prefecture of Shikoku, and has six bridges, spanning five islands in the accompanying inland sea, namely Shi Gui Island, Iwahei Island, Yuzuo Island, Heyi Island and Sanzi Island. With a total length of 13km or more, it is also a tourist attraction. In addition to pedestrians crossing the bridge, many tourists visit here every day. This bridge is an unprecedented masterpiece in the history of bridges in the world. Seto Bridge is a railway and highway bridge, which consists of two cable-stayed bridges, three suspension bridges and three truss bridges. It is the largest sea-crossing bridge in the world at present. It starts from Okayama County in Honshu in the north, like a gray-white steel dragon, passes through the only two-story tunnel in the world where railways and highways are separated from each other, meanders across the sea, and reaches Xiangshan County in Shikoku in the south. The complex underwater geological structure and wide water surface in Osedo waters, coupled with frequent typhoons and other unfavorable factors, give the design of the bridge

Brief introduction of seto, Japan

1955, a major accident occurred in the inland sea of Seto, causing more than 160 deaths, prompting the Japanese government to make up its mind to build bridges. April 1988, 10 The Seto Bridge connecting Kojima-CHO, Okayama Prefecture, Honshu and Sakaguchi City, Kagawa Prefecture, Shikoku was finally completed and opened to traffic, realizing the long-cherished wish of people on both sides of the strait for many years.

The construction period of this bridge is 9 years and 6 months, which is an unprecedented masterpiece in the history of bridges in the world. Seto Bridge is a railway and highway bridge, which consists of two cable-stayed bridges, three suspension bridges and three truss bridges. It is the largest sea-crossing bridge in the world at present. It starts from Okayama County in Honshu in the north, like a gray-white steel dragon, passes through the world's only two-story tunnel separated by railways and highways, meanders across the sea, and reaches Xiangchuan County in Shikoku in the south. The bridge spans five small islands in the sea. Seen from a distance, these five islands are like five bright green pearls, strung together with a silver thread. The complex underwater geological structure and wide water surface in Seto waters, coupled with frequent typhoons and other unfavorable factors, have brought many difficulties to the design and construction of the bridge. However, perhaps it is these unfavorable factors that force human beings to show their intelligence in the struggle with nature. According to the design, the bridge can resist an earthquake of magnitude 8.5 and a gale with a wind speed of 60 meters per second.

During the construction of the bridge, Japanese engineers and technicians overcame many unimaginable difficulties by using technologies such as underwater perforation blasting, large-diameter excavation and grouting concrete, and finally built this modern steel bridge with advanced technology and beautiful appearance. The sea-crossing bridge is 37 kilometers long and 9.4 kilometers long. As a railway and highway bridge, its total length is the second in the world (it was the first in the world, and its position was replaced by Hangzhou Bay Bridge on May 1 2008), and its longest suspension bridge (the distance between two towers) is 1 100 meters, ranking first in the world. It cost more than110 billion yen (about 8.46 billion US dollars). The tallest pylon is194m, which is equivalent to the height of 50 stories. In the inland sea area, there is no cold and heat, and it is surrounded by mountains. The crystal clear water reflects the low and undulating mountains, and the large and small islands in the sea complement the surrounding mountains.

bridge

Seto Bridge in Japan is the longest bridge in the world. It spans the Seto Inland Sea in Japan, connecting Okayama Prefecture in Honshu and Kagawa Prefecture in Shikoku. Seto Bridge in Japan started construction in June/KOOC-0/978+/KOOC-0/0/0, and was opened to traffic in April/KOOC-0/988. It lasted for 9 years and 6 months, and cost/KOOC-0//KOOC-0/00 billion yen (about 8.46 billion US dollars). The total length of Yinseto Bridge is 37.3km, and the sea surface is 13. 1 km. It consists of three cable bridges, two cable-stayed bridges and a truss bridge. The bridge ranks first among railway and highway bridges in the world with its magnificent construction scale. In order not to affect the navigation and landscape of ships, piers are basically built on five small islands in the sea, forming six connected bridges, namely: Seto Bridge in Xiajinjing, Shore Island Bridge, Yanhei Island Bridge, He Yi Island Bridge, Seto Bridge in Beizan and Seto Bridge in Nanzan. Seto Bridge has two decks, the upper deck is used by cars, the design speed is100km, there are four parallel lanes, and the daily traffic capacity is 48,000 vehicles. The lower floor is a double-track railway with a design speed of160km. Considering natural disasters and ship collision, according to the design, the bridge can resist an earthquake of magnitude 8.5 and a strong wind with a wind speed of 60 meters per second.

In order to prevent mutual damage caused by collision between ships and piers, the outer layer of piers is made of materials that are neither soft nor hard and resistant to seawater corrosion. Seto Bridge will use 700,000 tons of steel, 2.8 million cubic meters of concrete and 290,600 kilometers of steel cables. The longest of the six bridges is Seto Bridge in Nanbei Zan. Its two towers are194m high and1100m long. The steel cable used has a diameter of1.07m and a length of1780m, and can bear 90,000 tons of tension. The bridge is 65 meters above the water surface, and the 500,000-ton ship can be unimpeded under the bridge. In the past, it took more than 2 hours for vehicles to cross the sea, and only 40 minutes after the completion of the bridge, and it was not affected by the weather, which greatly promoted the exchange of economy, culture and various information between Honshu Island and Shikoku Island.

Navigation design

Seto Bridge is the longest railway and highway bridge system in the world, located between Shikoku Island and Honshu Island in Japan. It combines the essence of bridge construction technology in the world, spans five offshore islands and consists of three suspension bridges, two cable-stayed bridges and 1 truss bridge. The total length is 13. 1 km, and the sea-crossing part is about 9.4 km, extending for 37.3 km. The upper deck of the bridge is a four-lane expressway, which can pass 25,000 cars every day. The lower floor is a double-track railway, which passes through 120 electrified trains every day. When the tide is full, the clearance under the bridge is 65 meters, and the 500,000-ton tanker can pass. Nanbeizan Bridge, with a span of 1 100 meters, is the largest railway and highway suspension bridge in the world. According to the design of strong typhoon with earthquake resistance of 8 and speed of 60 meters per second. Its main tower height is194m, and the cable diameter is1.06m, which is composed of 344 17 5.65438+. It was built in1978,65438+10 ~ 1988, with an investment of113 billion yen (about 9 billion US dollars). After 30 years of construction, all the construction costs can be recovered.