| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a construction method for water-proof tunnel that reduces influence on a peripheral underground water environment as much as possible. <P>SOLUTION: The construction method for water-proof tunnel includes: an upper primary decking process of providing a primary decking 22 to an upper sectional excavation area 21 formed by excavating a natural ground 12 to a predetermined length repeatedly several times; an invert primary decking process of providing an invert primary decking 26 to an invert sectional excavation area 25 formed by excavating an invert 20 located below the upper sectional excavation area 21 to a predetermined length to close a tunnel; an invert secondary decking process of laying a water-proof sheet 14b on an internal surface of the invert primary decking 26, and spraying concrete containing an accelerating agent to provide an invert secondary decking 28; and an upper secondary decking process of laying a water-proof sheet 14a on an internal surface of the primary decking 22 in the upper sectional excavation area 21 above the invert 20 provided with the invert secondary decking 28, and providing a secondary decking 24 to construct a water-proof tunnel 10. <P>COPYRIGHT: (C)2013,JPO&INPIT |
