| 摘要 |
PROBLEM TO BE SOLVED: To provide a forepoling method for a tunnel for facilitating driving of pipe materials in the natural ground, by arranging a spiral blade in the tip vicinity of the pipe materials. SOLUTION: This forepoling method of the tunnel drives a plurality of pipe materials at an interval in the peripheral direction of the tunnel toward the natural ground 2 in front of the tunnel. The construction method covers the natural ground being an excavation object with the pipe materials with the spiral blade arranged in a predetermined range, by repeating driving work of the pipe materials with the spiral blade at a predetermined interval in the tunnel peripheral direction, by driving a hollow pipe material, that is, the pipe materials 1 with the spiral blade for arranging the spiral blade in the tip vicinity by rotating toward the natural ground in front of the tunnel. COPYRIGHT: (C)2005,JPO&NCIPI
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