| 摘要 |
PROBLEM TO BE SOLVED: To provide a tunneling method capable of starting or terminating an excavator inexpensively and safely in a short period. SOLUTION: An earth retaining member 16 enabling a cutting by the excavator 10 is used at the portion of a wall part where an arrival opening 14 is formed. A normal earth retaining member 18 disabling the cutting by the excavator 10 is used at the other portion of the wall part where an arrival shaft 12 is constructed. The earth retaining member 16 enabling the cutting by the excavator 10 is made of a polymer-impregnating concrete. The polymer-impregnating concrete earth retaining member 16 has a strength and rigidity capable of sufficiently withstanding a soil pressure, can be excavated by the excavator in a short period, and is manufacturable at low cost. A polymer-impregnating concrete earth retaining member 16 exhibits an arcuate plate shape, and its thickness is approximately 64 mm, its height is approximately 500 mm, its length is approximately 1570 mm, and its weight is 125 kg. COPYRIGHT: (C)2009,JPO&INPIT
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