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    • 3. 发明专利
    • SEGMENT
    • JPH1171993A
    • 1999-03-16
    • JP23157897
    • 1997-08-27
    • ISHIKAWAJIMA KENZAI KOGYO KK
    • HASHIMOTO HIROHIDEKIKUCHI SEISUKE
    • E21D11/08
    • PROBLEM TO BE SOLVED: To prevent breaking, damage, etc., by reducing the action of local stress in a segment even when external force is applied to a cylindrical wall body. SOLUTION: Joining end faces 12a in the longitudinal direction of the segment 11 with the joining end faces 12a in the longitudinal direction mutually connected in the axial direction of an excavated pit excavated by a shield machine and joining end faces 12b in the cross direction mutually connected in the circumferential direction of the excavated pit are formed in a curved shape in a plan view slightly bulged to the outside. When compressive force in the axial direction is applied to the segments 11 constituting the cylindrical wall body by jacks for the shield machine, stress concentration by the biting of corner sections to the joining end faces 12a in the longitudinal direction of the adjacent segments 1 is reduced, and the breaking and damage of the segments 1 are prevented.