| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure, in which no operation such as the corrosionproof treatment of a joint member for a segment, etc. and internal- surface secondary lining and the like is required. SOLUTION: In the joint structure by the male-female metal fittings 4, 7 abutting and joining the mutual end faces of the segments 1 having specified wall thickness, the hooked male metal fittings 4 are installed to one abutting end face 3 in the tunnel circumferential direction of the segments 1, recessed sections 6, into which the male metal fittings 4 are fitted, are formed to the other abutting end face 5, and the female metal fittings 7 with engaging holes 8, with which the engaging front-end sections 4a of the male metal fittings 4 are engaged by moving the segments 1 in the tunnel axial direction in the recessed sections 6, are buried to the other abutting end face 5. Flexible springs 13 clamping the abutting surfaces by drawing the engaging front-end sections 4a of the male metal fittings 4 inserted into the engaging holes 8 near in the bottom direction of the recessed sections 6 are installed to the female metal fittings 7.
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