| 摘要 |
PROBLEM TO BE SOLVED: To provide a tunnel junction part and a construction method for the tunnel junction part for constructing the tunnel junction part within a site having the minimum required size for the tunnel junction part when communicating a main track tunnel with a ramp tunnel in the tunnel junction part with excellent construction property. SOLUTION: In this construction method, a width extended part 7e, which becomes a pipe roof start base 11, is provided by increasing amount of width extension step by step, a pipe 17 to be constructed by starting from the pipe roof start base 11 toward substantially axial direction of the main track shield tunnel 1 is provided in a fanning-out form to construct a pipe roof 13, and a zone surrounded by the pipe roof 13 is used as a water cut-off zone 25 to construct a tunnel skeleton 29. COPYRIGHT: (C)2009,JPO&INPIT
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