METHOD OF EXCAVATING TUNNEL

This invention relates to a method of excavating a tunnel to pierce through a mountain or underground, in which a large number of slits (2) are drilled at spatial intervals along a line (1) designed for defining a tunnel to be excavated as well as on the facing (4) encircled by the abovesaid designe...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	SATOMI, TATSUYA
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
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