| 摘要 |
PURPOSE:To construct the connecting part between a shaft and an adit at a sharp angle by excavating a connecting section while pressing a curved segment with a rotating jack after construction of the shaft, and separating a nuclear shield machine 3 from a front drum to excavate the adit. CONSTITUTION:A propulsive jack is disposed in a rear drum 2, and a front drum 1 is connected to the rear drum 2 by a hinge 21 in such a manner as to be capable of bending. The cutter heads 11, 31 of a nuclear shield machine 3 are rotated to assemble a shaft segment 6 in the rear of the rear drum 2, while which excavation is carried out by a propulsive jack, and at a determined depth, the propulsive jack is exchanged to a rotating jack 23. A curved segment 61 is pressed by the rotating jack 23 to excavate to a determined depth, and then drilling is conducted by sue of a bit 13. Further, after excavating the connecting section, a tail plate 33 is connected to the rear end part of the outer shell 32 of the nuclear shield machine 3, which is then separated from the front drum 1 to start the excavation of an adit. Hence, the connecting part of the shaft and the adit can be excavated at a right angle or sharp angle to construct a tunnel, and the constructing cost and period can be reduced. |
