| 摘要 |
PROBLEM TO BE SOLVED: To minimize the effect of a construction method on a ground surface by adopting a method of constructing a plurality of horizontal tunnels serving as minimum small openings at intervals in the longitudinal direction of a shield tunnel when a diverging/converging wide section is constructed. SOLUTION: In this method of constructing a wide section of a tunnel, the section space of the diverging/converging wide part serving as a diverging section or a converging section from a tunnel main line is constructed. The method comprises a horizontal tunnel excavating step of excavating horizontal tunnels 1, 2 from the tunnel main line T side in the diverging/converging wide section, and a skeleton construction step of constructing covering skeletons 4, 5 in the excavated horizontal tunnels. The horizontal tunnel excavating step comprises a preceding tunnel excavation step of excavating a plurality of preceding tunnels 1, 2 at intervals in the longitudinal direction of the tunnel main line and a following tunnel excavating step of excavating following tunnels 3 between these preceding tunnels. COPYRIGHT: (C)2009,JPO&INPIT |
