| 摘要 |
PROBLEM TO BE SOLVED: To provide a tunnel support which can be safely set in a tunnel excavated in the natural ground especially of a high collapsing danger, by using a shield-type TBM, and to provide a tunnel supporting method. SOLUTION: According to the tunnel supporting method, the support 1 is framed in a tail hood 10 of a shield main body such that an upper support portion 2 is smaller in curvature radius than the other support portions inclusive of both side support portions and a lower support portion in a predetermined angle range. After framing of the support, a sheet pile 21 is set at an interval between the upper support portion 2 and an upper support portion 2 of an existing support 1-1, to block the interval, and thereafter the tail hood 10 is advanced.
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