The Great Seto Bridge or Seto Ohashi Bridge (瀬戸大橋, Seto Ōhashi)[1][note 1] is a series of double deck bridges connecting Okayama and Kagawa prefectures in Japan across a series of five small islands in the Seto Inland Sea. Built over the period 1978–88, it is one of the three routes of the Honshū–Shikoku Bridge Project connecting Honshū and Shikoku islands and the only one to carry rail traffic. The total length is 13.1 kilometers (8.1 mi), and the longest span, the Minami Bisan-Seto Bridge, is 1,100 m (3,600 ft).
Great Seto Bridge (瀬戸大橋, Seto Ōhashi)
Great Seto Bridge from Honshū (left) via the islands of Hitsuishijima and Yoshima to Shikoku
Crossing the bridge takes about 20 minutes by car or train. The ferry crossing before the bridge was built took about an hour.
The bridges carry two lanes of highway traffic in each direction (Seto-Chūō Expressway) on the upper deck and one railway track in each direction (Seto-Ōhashi Line) on the lower deck. The lower deck was designed to accommodate an additional set of Shinkansen tracks for a proposed extension of the Shinkansen to Shikoku.[2]
When in 1889 the first railway in Shikoku was completed between Marugame and Kotohira, a member of the Prefectural Parliament, Jinnojo Ōkubo (大久保諶之丞, Ōkubo Jinnojo, 1849–1891), stated in his speech at the opening ceremony: "The four provinces of Shikoku are like so many remote islands. If united by roads, they will be much better off, enjoying the benefits of increased transportation and easier communication with each other."[citation needed]
While it took a century for this vision of a bridge across the Seto Inland Sea to become reality, another of Ōkubo's ideas, mentioned in a drinking song he composed, was accomplished twenty years sooner:
The bridge idea lay dormant for about sixty years. In 1955, after 171 people died when a ferry wrecked in dense fog off the coast of Takamatsu, a safer crossing was deemed necessary. By 1959, meetings were held to promote building the bridge. Scientists began investigations shortly after, and in 1970, the Honshu-Shikoku Bridge Construction Authority was inaugurated. However, work was postponed for five years by the "oil shock" of 1973; once the Environment Assessment Report was published in 1978, construction got underway. The ferry disaster also led to the creation of the Akashi Kaikyō Bridge.
The project took ten years to complete at a cost of US$7 billion; 3.646 million cubic meters (128.8 million cubic feet) of concrete and 705,000 tons of steel were used in construction.[citation needed] Although nets, ropes and other safety measures were employed, the lives of 13 workers were lost during the 10 years of construction.[citation needed] The bridge opened to road and rail traffic on April 10, 1988.
Constituent bridgesedit
Views from outside and riding on the Great Seto Bridge, 2017Shimotsui-Seto BridgeHitsuishijima Bridge (far) and Iwakurojima Bridge (near)The Kita Bisan-Seto Bridge seen from Yoshima IslandThe Minami Bisan-Seto Bridge (near) and the Kita Bisan-Seto Bridge (far)Panoramic View from North side
Six of the eleven bridges are separately named, unlike some other long bridge complexes such as the San Francisco–Oakland Bay Bridge. The other five bridges are viaducts. The six named bridges from north to south are listed below.
The Iwakurojima Bridge (34°24′06.3″N133°48′33″E / 34.401750°N 133.80917°E / 34.401750; 133.80917 岩黒島橋, Iwakurojima-kyō) is a double-decked cable-stayed bridge with a center span of 420 meters (1,380 ft) and a total length of 790 meters (2,590 ft). It is immediately south of the identical Hitsuishijima Bridge.
The Kita Bisan-Seto Bridge (34°23′43.5″N133°49′13.7″E / 34.395417°N 133.820472°E / 34.395417; 133.820472 北備讃瀬戸大橋, Kita Bisan Seto Ō-hashi) is a double-decked suspension bridge with two sections linked by a common anchorage between them. The center span is 990 meters (3,248 ft) and the total length is 1,538 m (5,046 ft). It is the 19th largest suspension bridge in the world. The nearly identical Minami Bisan Seto Bridge is located immediately to the south.
Minami Bisan-Seto Bridge
The Minami Bisan-Seto Bridge (34°21′51″N133°49′31″E / 34.36417°N 133.82528°E / 34.36417; 133.82528 南備讃瀬戸大橋, Minami Bisan Seto Ō-hashi) is a double-decked suspension bridge with a center span of 1,100 meters (3,609 ft) and a total length of 1,648 m (5,407 ft). It is the 13th longest suspension bridge span in the world. It is the southernmost part of the Great Seto Bridge. The roadway of the bridge is 93 meters (305 ft) above sea level.[citation needed]
^"北陸新幹線の新大阪駅、その先をどうするか". ITmedia ビジネスオンライン (in Japanese). Retrieved 2021-06-03.
^2008 Press Release (2008年プレスリリース (in Japanese). Archived from the original on 2008-12-12. Retrieved 2010-07-04.). JB本四高速 (Honshu-Shikoku Bridge Expressway Company). Accessed February 24, 2010.
External linksedit
Wikimedia Commons has media related to Great Seto Bridge.
Google Earth view of the strait between Shikoku and Honshu
Google Earth view of the Great Seto Bridge
March 13, 2024
great, seto, bridge, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, june, . This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Great Seto Bridge news newspapers books scholar JSTOR June 2009 Learn how and when to remove this template message The Great Seto Bridge or Seto Ohashi Bridge 瀬戸大橋 Seto Ōhashi 1 note 1 is a series of double deck bridges connecting Okayama and Kagawa prefectures in Japan across a series of five small islands in the Seto Inland Sea Built over the period 1978 88 it is one of the three routes of the Honshu Shikoku Bridge Project connecting Honshu and Shikoku islands and the only one to carry rail traffic The total length is 13 1 kilometers 8 1 mi and the longest span the Minami Bisan Seto Bridge is 1 100 m 3 600 ft Great Seto Bridge 瀬戸大橋 Seto Ōhashi Great Seto Bridge from Honshu left via the islands of Hitsuishijima and Yoshima to ShikokuCoordinates34 23 54 N 133 48 36 E 34 39833 N 133 81000 E 34 39833 133 81000Carries4 lanes of Seto Chuō Expressway upper 2 rail lines lower CrossesSeto Inland SeaLocaleHonshu and ShikokuMaintained byHonshu Shikoku Bridge AuthorityCharacteristicsDesignDouble decked bridge systemTotal length13 1 km 8 1 mi HistoryOpened1988 36 years ago 1988 LocationCrossing the bridge takes about 20 minutes by car or train The ferry crossing before the bridge was built took about an hour The bridges carry two lanes of highway traffic in each direction Seto Chuō Expressway on the upper deck and one railway track in each direction Seto Ōhashi Line on the lower deck The lower deck was designed to accommodate an additional set of Shinkansen tracks for a proposed extension of the Shinkansen to Shikoku 2 Contents 1 History 2 Constituent bridges 3 Sister bridges 4 See also 5 Notes 6 References 7 External linksHistory edit nbsp Green Great Seto Bridge Yellow Kobe Awaji Naruto Expressway Red Nishiseto ExpresswayWhen in 1889 the first railway in Shikoku was completed between Marugame and Kotohira a member of the Prefectural Parliament Jinnojo Ōkubo 大久保諶之丞 Ōkubo Jinnojo 1849 1891 stated in his speech at the opening ceremony The four provinces of Shikoku are like so many remote islands If united by roads they will be much better off enjoying the benefits of increased transportation and easier communication with each other citation needed While it took a century for this vision of a bridge across the Seto Inland Sea to become reality another of Ōkubo s ideas mentioned in a drinking song he composed was accomplished twenty years sooner I ll tell you dear don t laugh at me a hundred years from now I ll be seeing you flying to and from the moon in a space ship Its port let me tell you dear will be that mountaintop over there 1 The bridge idea lay dormant for about sixty years In 1955 after 171 people died when a ferry wrecked in dense fog off the coast of Takamatsu a safer crossing was deemed necessary By 1959 meetings were held to promote building the bridge Scientists began investigations shortly after and in 1970 the Honshu Shikoku Bridge Construction Authority was inaugurated However work was postponed for five years by the oil shock of 1973 once the Environment Assessment Report was published in 1978 construction got underway The ferry disaster also led to the creation of the Akashi Kaikyō Bridge The project took ten years to complete at a cost of US 7 billion 3 646 million cubic meters 128 8 million cubic feet of concrete and 705 000 tons of steel were used in construction citation needed Although nets ropes and other safety measures were employed the lives of 13 workers were lost during the 10 years of construction citation needed The bridge opened to road and rail traffic on April 10 1988 Constituent bridges edit source source source source source source source source Views from outside and riding on the Great Seto Bridge 2017 nbsp Shimotsui Seto Bridge nbsp Hitsuishijima Bridge far and Iwakurojima Bridge near nbsp The Kita Bisan Seto Bridge seen from Yoshima Island nbsp The Minami Bisan Seto Bridge near and the Kita Bisan Seto Bridge far nbsp Panoramic View from North sideSix of the eleven bridges are separately named unlike some other long bridge complexes such as the San Francisco Oakland Bay Bridge The other five bridges are viaducts The six named bridges from north to south are listed below Shimotsui Seto Bridge The Shimotsui Seto Bridge 34 25 51 N 133 48 22 4 E 34 43083 N 133 806222 E 34 43083 133 806222 下津井瀬戸大橋 Shimotsui Seto Ō hashi is a double decked suspension bridge with a center span of 940 meters 3 080 ft and a total length of 1 400 meters 4 600 ft which connects Honshu with the island of Hitsuishijima It is the 45th largest suspension bridge in the world It is the northernmost bridge of the Seto Chuo Expressway Hitsuishijima Bridge The Hitsuishijima Bridge 34 24 35 N 133 48 25 6 E 34 40972 N 133 807111 E 34 40972 133 807111 櫃石島橋 Hitsuishijima kyō is a double decked cable stayed bridge with a center span of 420 meters 1 380 ft and a total length of 790 meters 2 590 ft It is immediately north of the identical Iwakurojima Bridge Iwakurojima Bridge The Iwakurojima Bridge 34 24 06 3 N 133 48 33 E 34 401750 N 133 80917 E 34 401750 133 80917 岩黒島橋 Iwakurojima kyō is a double decked cable stayed bridge with a center span of 420 meters 1 380 ft and a total length of 790 meters 2 590 ft It is immediately south of the identical Hitsuishijima Bridge Yoshima Bridge The Yoshima Bridge 34 23 37 2 N 133 48 45 2 E 34 393667 N 133 812556 E 34 393667 133 812556 与島橋 Yoshima kyō is a continuous double decked truss bridge with a main span of 246 meters 807 ft and a total of five spans with a length of 847 meters 2 779 ft It is immediately south of the Hitsuishijima and Iwakurojima Bridges Kita Bisan Seto Bridge The Kita Bisan Seto Bridge 34 23 43 5 N 133 49 13 7 E 34 395417 N 133 820472 E 34 395417 133 820472 北備讃瀬戸大橋 Kita Bisan Seto Ō hashi is a double decked suspension bridge with two sections linked by a common anchorage between them The center span is 990 meters 3 248 ft and the total length is 1 538 m 5 046 ft It is the 19th largest suspension bridge in the world The nearly identical Minami Bisan Seto Bridge is located immediately to the south Minami Bisan Seto Bridge The Minami Bisan Seto Bridge 34 21 51 N 133 49 31 E 34 36417 N 133 82528 E 34 36417 133 82528 南備讃瀬戸大橋 Minami Bisan Seto Ō hashi is a double decked suspension bridge with a center span of 1 100 meters 3 609 ft and a total length of 1 648 m 5 407 ft It is the 13th longest suspension bridge span in the world It is the southernmost part of the Great Seto Bridge The roadway of the bridge is 93 meters 305 ft above sea level citation needed Sister bridges edit nbsp A plaque denoting the Sister Bridge friendship between the Great Seto Bridge and the Golden Gate Bridge in San Francisco California United StatesGolden Gate Bridge San Francisco California United States Affiliated from April 5 1988 Fatih Sultan Mehmet Bridge Istanbul Turkey Affiliated from July 3 1988 Oresund Bridge Malmo Sweden and Copenhagen Denmark Affiliated from May 24 2008 3 See also editHonshu Shikoku Bridge Project three routes connecting Honshu and Shikoku Akashi Kaikyō Bridge Kurushima Kaikyō Bridge Tsing Ma Bridge which has the longest road rail span in the world List of largest suspension bridges List of largest cable stayed bridges Mount Washu viewpoint of the Great Seto BridgeNotes edit Seto Ohashi is the term used on e g Google MapsReferences edit 英語表記のガイドライン 香川県 English Guidelines Kagawa Prefecture 香川県 Kagawa Prefecture Retrieved 17 February 2021 北陸新幹線の新大阪駅 その先をどうするか ITmedia ビジネスオンライン in Japanese Retrieved 2021 06 03 2008 Press Release 2008年プレスリリース Jb本四高速 2008年プレスリリース 瀬戸大橋とオーレスン橋の姉妹橋調印式について in Japanese Archived from the original on 2008 12 12 Retrieved 2010 07 04 JB本四高速 Honshu Shikoku Bridge Expressway Company Accessed February 24 2010 External links edit nbsp Wikimedia Commons has media related to Great Seto Bridge Honshu Shikoku Bridge Authority homepage Great Seto Bridge Outline Shimotsui Seto Bridge Hitsuishijima Bridge Iwakurojima Bridge Yoshima Bridge Kita Bisan Seto Bridge Minami Bisan Seto Bridge Structurae Shimotsui Seto Bridge Hitsuishijima Bridge Iwagurojima Bridge Yoshima Bridge Kita Bisan Seto Bridge Minami Bisan Seto Bridge Google Earth view of the strait between Shikoku and Honshu Google Earth view of the Great Seto Bridge Retrieved from https en wikipedia org w index php title Great Seto Bridge amp oldid 1177346785 Constituent bridges, wikipedia, wiki, book, books, library,
