| 摘要 |
PROBLEM TO BE SOLVED: To establish a method for tunnel constructing works in which a simple and low-cost timbering system is incorporated in lieu of the sheet pile system. SOLUTION: When a tunnel is to be constructed using a tunnel boring machine(TBM) 1, a liner piece 20 of a suitable type according to the size and condition of the rocks and stones which have fallen down and are placed on a boring machine skin plate 2 is assembled and installed inside the top of the skin plate 2, and the liner piece 20 is borne by a ring timbering 12 of elongation type installed on the side wall of the tunnel. Then the propulsive excavation with the boring machine 1 is conducted while falling rocks and stones after passage of the skin plate 2 generated in association with the propulsive excavation are received by and fixed to the natural ground by the liner piece 20. |
