SEGMENT JOINING STRUCTURE

PROBLEM TO BE SOLVED: To provide a segment joining structure capable of suppressing the set-back necessary for the segment assembly to be small, and preventing the misalignment of each segment. SOLUTION: In this joining structure 1, a line 5 extending along a short side of a base part 3a is diagonally intersected with the line in the axial direction of a tunnel and a line in the radial direction of the tunnel at the position of a folded part of a locking part 3b, and a whole joint 3 is provided on a joining surface 2a of a segment 2 in an inclined condition. The line extending along the short side of the base part at the position of the folded part of the locking part suppresses the set-back in assembling the segment to be smaller than that of a conventional structure in which a joint in a diagonally intersected condition only at the line in the axial direction of the tunnel. The misalignment is prevented by restricting the deviation (misalignment) of the segment 2 in the diameter direction of the tunnel. In addition, the tension and the shearing force applied to the section can be simultaneously sustained by using the joint 3.