The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825. However, this was only the invention of the shield concept and did not involve the construction of a complete tunnel boring machine, the digging still having to be accomplished by the then standard excavation methods.
あ: アジテーター (英) agitator: 一般には強制撹拌する装置をいう。泥水シールドにおいては、チャンバー内下部に取付けられたプロペラ型攪拌翼を言う。
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