| 摘要 |
PROBLEM TO BE SOLVED: To provide a departure shaft structure capable of being adapted to a pipe jacking method and a shield tunneling method and achieving reduction of costs required for soil improvement. SOLUTION: A front circular tube body 3 and a rear circular tube body 4 capable of storing equipment for a pipe jacking method or a shield tunneling method are arranged outside of symmetrical positions on both sides sandwiching an axis halfway in the vertical direction of a circumferential wall of a casing start vertical shaft 1 in the state of communicating with the interior of the start vertical shaft 1, and zones of the start vertical shaft 1 below the two circular tube bodies 3, 4 are used as a storage section 6 for earth removing equipment 5, and the vertical cross-section along the jacking direction has a cruciform shape. COPYRIGHT: (C)2009,JPO&INPIT
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