| 摘要 |
PROBLEM TO BE SOLVED: To provide segments for a tunnel in which the main bodies of neighboring segments can be coupled together with strong jointing force and a dovetail member hardly comes off. SOLUTION: In these segments for a tunnel, dovetail groove portions 3 are provided, which face each other when both the butt portions 1a are butted at the respective butt portions 1a of the main bodies 1 of a pair of tunnel segments to be assembled adjacently; dovetail members 5 equipped with enlarged head portions 4 freely suitable respectively along both the dovetail groove portions 3 are provided on both side portions; outer side portions of the dovetail members 5 are formed in such a manner that both the enlarged head portions 4 are separated further when the position comes forward in fitting direction; and when both butt portions 1a are butted, both the dovetail groove portions 3 are so formed that the portions corresponding to the outer side portion of both the dovetail members 5 are separated further as the position comes frontward in the fitting direction of the dovetail members 5. |
