| 摘要 |
PROBLEM TO BE SOLVED: To shorten work periods and reduce a construction cost by mutually connecting adjacent segments easily. SOLUTION: In a plurality of the segments being installed on the internal surface of a tunnel and constructing the wall section of the tunnel, the segments have joints 17 composed of one engaging sections 5 mounted on the end faces of one adjacent segments 1 and the other engaging sections 13 secured on the end faces of the other adjacent segments 9 while being engaged with one engaging sections 5. One engaging sections 5 consist of protrusions 6 and recesses 7 continued to the protrusions 6, and the other engaging sections 13 consist of the recesses 15 engaged with the protrusions 6 of one engaging sections 5 and the protrusions 14 continued to the recesses 15 while being engaged with the recesses 7 of one engaging sections 5. The front ends of the recesses 7 and 15 are formed in a wedge shape bitten to sections inner than the front ends of the protrusions 6 and 14 on boundary sections 8 and 16 among the protrusions 6 and 14 and recesses 7 and 15 of each segment 1 and 9. COPYRIGHT: (C)2004,JPO&NCIPI
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