METHOD OF BUILDING UNDERGROUND CAVERN AND TUNNELLING MACHINE.

摘要

A method of forming an underground passage, developed so as to safely and economically form a large-scale underground passage of a large depth in the soft ground or a soft rock layer, and a tunnel excavator suitably used in this method. This method of forming underground passages consists of the steps of forming a reinforced ground zone (A) around the portion of the ground in which a large-scale passage is to be excavated, before starting the excavation, and then excarting the inner side of this reinforced ground zone. A tunnel excavator (4) is provided with a ring-shaped body having first, second and third rings (20, 21, 22); boring units (41-43) provided between the second ring (21) and a propulsive jack (25) and adapted to make a plurality of radial bores (60) in the inner surface of a tunnel; and reinforcing material fillers (48-52) provided also between the second ring and propulsive jack and adapted to fill these bores with a reinforcing material (53).