Severn Bridge

Japanese: Severn Bridge（英語表記）SevernBridge

…In the 20th century, record-breaking suspension bridges were built one after another in the United States. Finally, in 1931, the George Washington Bridge, with a span of over 1 km, was erected over the Hudson River in New York, and in 1937, the Golden Gate Bridge (span 1,280 m), which held the title for the next quarter century, was built. Since the dramatic accident caused by the wind on the Tacoma Narrows Bridge in the same United States in 1940, the stiffening girders had been made into a truss structure, but an innovative design that broke this rule was realized in 1966 on the Severn Bridge in the UK (spanning the Severn River near Bristol, with a central span of 988 m). …

From the Humber Bridge

...However, due to political and financial reasons, construction did not begin until 1972, and even after construction began, labor disputes, bad weather, difficulties with foundation work, and accidents during construction caused significant delays in the construction period, and it was finally opened in June 1981. The bridge is characterized by its reinforced concrete structure, which is rare for such a large suspension bridge, its girders being streamlined steel box girders, and the girders being suspended from the main cables by triangular diagonal suspension members. These suspension structure features are modeled after the Severn Bridge, which spans the River Severn near Bristol, England, with a central span of 988 meters and attracted attention from the global bridge community when it was completed in 1966. The height of the bridge is 30m, the effective width of the road including the sidewalk is 28.5m, the main cable is made up of approximately 15,000 wires with a diameter of 5mm on each side, and the weight of the steel is 11,000t for the cable and 16,500t for the suspended structure.

*Some of the terms mentioned in "Severn Bridge" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…20世紀に入って，アメリカでは続々と記録破りのつり橋が誕生し，1931年にはついに1kmを超える支間をもつジョージ･ワシントン橋The George Washington Bridgeがニューヨークのハドソン川に架設され，37年には以後四半世紀にわたって王座を占めたゴールデン･ゲート橋(支間1280m)が作られた。40年同じアメリカでタコマ･ナローズ橋が風による劇的な事故を起こして以来，補剛桁はトラス構造とするのが常道となっていたが，これを打破する革新的な設計が66年イギリスのセバーン橋Severn Bridge(ブリストルの近く，セバーン川に架かる。中央径間988m)で実現された。…

【ハンバー橋】より

…しかし政治･財政上の事情から工事が着手されたのは72年で，着工後も労働争議，悪天候，基礎工事の難航，架設途中での事故などにより大幅に工期が延び，81年6月ようやく開通に至った。主塔(橋脚上155.5m)がこれだけの大つり橋には珍しい鉄筋コンクリート構造であること，桁が流線形断面鋼箱桁であること，そしてこの桁を主ケーブルから三角形状をなす斜めつり材でつっていることが特徴で，これらつり構造の特色は，1966年に完成して世界の橋梁（きようりよう）界の注目を浴びた，イギリス，ブリストル近くのセバーン川に架かる中央径間988mのセバーン橋Severn Bridgeの流れをくむものである。桁下の高さは30m，歩道を含む道路の有効幅員は28.5m，主ケーブルは片側当り径5mmのワイヤ約1万5000本よりなり，鋼材の重量はケーブル1万1000t，つり構造部1万6500tに及ぶ。…

※「Severn Bridge」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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