… [Shigeru Koike] From [Tunnel]...a space created below the ground surface by digging into soil or rock, usually in the form of a long, narrow, nearly horizontal passageway. Usually, tunnels are created by digging underground, leaving the natural ground above, but tunnels can also be created by digging a trench from the ground surface, constructing a tunnel structure in it, and then filling it back in, a method known as cut-and-cover construction. This method is used to build relatively shallow subways under city streets. *Some of the terminology used in reference to the "cut and cover method" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…【小池 滋】 【トンネル】より…土や岩を掘って地表下につくられた空間で,通常はほぼ水平な細長い通路状のものをいう。上方に地山(じやま)(在来地盤)を残して地中を掘り進んでつくられるものがふつうであるが,地表から溝状に掘ってその中にトンネル構造物をつくり,再び埋め戻してつくる,いわゆる開削工法によるものもトンネルに含まれる。この工法は都市内の街路下に,比較的浅い地下鉄道をつくるときなどに用いられる。… ※「開削工法」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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