| 摘要 |
PROBLEM TO BE SOLVED: To enable a trunk tunnel to curvedly drive by a shield machine, at the same time, surely and smoothly propel the shield machine by using a plurality of shield jacks, surely and smoothly propel an inner drum for opening a starting opening and bifurcate the branch shield machine from the starting opening. SOLUTION: A rear drum 4 is equipped with a first rear drum 8 and a second rear drum 9 internally fitted to the front end part of the first rear drum 8 in a slidable manner back and forth, a plurality of shield jacks 51 mounted to the second rear drum 9 and a first connecting member 42 integrally and detachably connecting an outer drum 8 to an inner drum 6 in a state to fit the inner drum 6 to the outer drum 8 are provided, a plurality of shield jacks 51 are used in a state to release the connection by the first connecting member 80 to open the starting opening 40 by integrally propelling the inner drum 6 and the second rear drum 9 to the outer drum 7 and the first rear drum 8, and the branch shield machine 1B is bifurcated and started from the starting opening 40. COPYRIGHT: (C)2004,JPO
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