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支間長
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支間長

凄過ぎる日本企業の技術力

【世界最長】の明石大橋、次は何処でしょう?

世界で最も長い吊り橋は、 神戸と淡路島を結ぶ「明石海峡大橋」です。 吊り橋は一般的に、2本の主塔の距離「支間長」で表すそうです。 「明石海峡大橋」の最大支間長は1991メートル、 全長は3911メートルにも及ぶと言います。 戦前から明石海峡...