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涵洞,又稱暗渠,是一種用來為道路泄水排涵的暗渠或暗(管狀的涵洞又稱涵管),通常較隧道短小。按照建造方式劃分,可分為圓管涵蓋板涵等等。

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日本北海道吉岡海底站月台旁的側向涵洞,兩邊牆上貼滿了來訪學童的留言畫

建造道路時,當遇上河道、渠道或天然排水溝時,通常會預留空間建造涵洞。

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