Great Seto Bridge




















Great Seto Bridge
(瀬戸大橋, Seto Ōhashi)

Seto-Ohashi Bridge.jpg
Great Seto Bridge from Honshū (left) via the islands of Hitsuishijima and Yoshima to Shikoku

CoordinatesCoordinates: 34°23′54″N 133°48′36″E / 34.39833°N 133.81000°E / 34.39833; 133.81000
Carries4 lanes of Seto-Chūō Expressway (upper)
2 rail lines (lower)
CrossesSeto Inland Sea
Locale
Honshū and Shikoku
Maintained byHonshu–Shikoku Bridge Authority
Characteristics
DesignDouble-decked bridge system
Total length13.1 km (8.1 mi)
History
Opened1988
Statistics
Toll4,850 yen

The Great Seto Bridge (瀬戸大橋, Seto Ōhashi)[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 with railroad connections included. At 13.1 kilometers (8.1 mi), it ranks as the world's longest two-tiered bridge system.


Crossing the bridge takes about 20 minutes by car or train. The ferry crossing before the bridge was built took about an hour. The non-discounted toll from Kojima, Kurashiki (Okayama Prefecture on the Honshu side) to Sakaide (Kagawa Prefecture on the Shikoku side) is ¥3,500, and vice versa.


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 Shinkansen rail line in each direction.




Contents





  • 1 History


  • 2 Constituent bridges


  • 3 Sister bridges


  • 4 See also


  • 5 References


  • 6 External links




History




Green: Seto-Ōhashi
Yellow: Kōbe–Awaji–Naruto
Red: Nishiseto–Expressway


When in 1889 the first railway in Shikoku - between Marugame and Kotohira - was completed, 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![citation needed]

The bridge idea lay dormant for about sixty years. In 1955, after 171 lives were lost 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 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




Shimotsui-Seto Bridge




Hitsuishijima Bridge (far) and Iwakurojima Bridge (near)




The Kita Bisan-Seto Bridge seen from Yoshima Island




The 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.


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 Honshū with the island of Hitsuishijima. It is the 22nd 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 Ōhashi) 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



  • Golden Gate Bridge, San Francisco, California, United States
    • Affiliated from April 5, 1988


  • Fatih Sultan Mehmet Bridge, Istanbul, Turkey
    • Affiliated from July 3, 1988


  • Øresund Bridge, Malmo, Sweden and Copenhagen, Denmark
    • Affiliated from May 24, 2008[2]


See also


  • Honshū–Shikoku Bridge Project

  • List of largest suspension bridges

  • List of largest cable-stayed bridges

  • Akashi Kaikyō Bridge

  • Kurushima-Kaikyō Bridge


References




  1. ^ "Seto-Ohashi" is the term used on e.g. Google Maps


  2. ^ 2008 Press Release (2008年プレスリリース "Archived copy". Archived from the original on 2008-12-12. Retrieved 2010-07-04.CS1 maint: Archived copy as title (link).mw-parser-output cite.citationfont-style:inherit.mw-parser-output .citation qquotes:"""""""'""'".mw-parser-output .citation .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-ws-icon abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center.mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-maintdisplay:none;color:#33aa33;margin-left:0.3em.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em
    (in Japanese)
    )
    . JB本四高速 (Honshu-Shikoku Bridge Expressway Company). Accessed February 24, 2010.





External links





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  • Honshū-Shikoku Bridge Authority homepage (in English)
    • 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


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