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Tunnel hole-through : ウィキペディア英語版 | Tunnel hole-through
Tunnel hole-through, also called breakthrough, is the time, during the construction of a tunnel built from both ends, when the ends meet, and the accuracy of the survey work becomes evident. Many tunnels report breakthroughs with an error of only a few inches. == See also ==
* Cascade Tunnel * Blue Ridge Tunnel - * Blue Ridge Tunnel - - 1944
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Tunnel hole-through」の詳細全文を読む
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