Cut and cover method

Japanese: 開削工法 - かいさくこうほう
Cut and cover method

… [Shigeru Koike]
[Subway Technology]

[Tunnel construction method and shape]
Subway tunnel construction methods are broadly divided into vertical excavation, in which a tunnel is dug from the ground surface down, and horizontal excavation, in which a tunnel is excavated horizontally. The most common of the former is the open cut method (also called the cut and cover method or open cut method), and other methods include the caisson method. Representative horizontal excavation methods are the shield method and the mountain tunnel method.

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

Japanese:

…【小池 滋】
【地下鉄の技術】

[トンネルの工事方法と形状]
 地下鉄トンネルの工法は,地表面から掘り下げてトンネルをつくる垂直掘削方式と,横孔式にトンネルを掘進する水平掘進方式とに大別される。前者は開削工法(カットアンドカバー工法またはオープンカット工法ともいう)が最も一般的で,ほかにケーソン工法などもこれに属する。水平掘進方式はシールド工法と山岳トンネル工法とがその代表的なものである。…

【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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