| 摘要 |
PROBLEM TO BE SOLVED: To reduce construction cost and shorten the period of construction by reducing the excavation section of a parallel tunnel such as a sidewalk to a minimum necessary size. SOLUTION: In the tunnel construction method for constructing a tunnel lining structure 2 by inserting lining elements 3 in parallel to the natural ground prior to tunnel excavation, an upper floor slab 4 is formed to extend horizontally from a side wall slab 5, and a guide pipe 14 is set in a lower natural ground position apart from an end element 3e of the extension part 7 by a predetermined distance. After the upper floor slab 4 and the side wall slab 5 are constructed, a pulley support mechanism supporting a cutting pulley is stowed in the end element 3e and the guide pipe 14, and the natural ground between the end element 3e and the guide pipe 14 is cut by a flexible cutting tool such as a wire saw wound on the cutting pulley, a protective plate 8 is inserted to the cut part, and the inside natural ground partitioned by the protective plate 8, the extension part 7 and the side wall slab 5 is excavated to construct the side tunnel 10. COPYRIGHT: (C)2008,JPO&INPIT
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