| 摘要 |
PROBLEM TO BE SOLVED: To propose a large-cross-section tunnel including arch parts capable of being easily constructed at low cost. SOLUTION: A top slab 2, a deck slab 3, and right and left side walls 4, 4 are formed in the large-cross-section tunnel 1. The top slab 2 is formed into a shape of an arc by laterally arranging a plurality of small-cross-section tunnels 10, having trapezoidal cross section with the short sides thereof oriented downward. The deck slab 3 is formed into the shape of the arc by laterally arranging a plurality of the small cross section tunnels 10, having the trapezoidal cross section with the short sides thereof oriented upward. On the upper ends of the side walls 4, 4, inclined surfaces 4a corresponding to the inclination of the lower surfaces 2a of the top slab 2 are formed. On the lower ends of the side walls 4, 4, inclined surfaces 4b corresponding to the inclination of the upper surfaces 3a of the deck slab 3 are formed. COPYRIGHT: (C)2011,JPO&INPIT
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