| 摘要 |
PROBLEM TO BE SOLVED: To efficiently construct a tunnel having a desired diameter and a desired length without having an effect on a ground as a ground subsidence or the like on the ground having a water retentivity. SOLUTION: The small-diameter tunnel (t) is constructed towards the other shaft C from one shaft B created in the ground having the water retentivity, and chemical pouring pipes 4 are driven towards the outer peripheral section of a designed tunnel T' from the inside of the tunnel (t) and an impervious shell wall 1 by the pouring of chemicals such as mortar is created cylindrically on the outer peripheral section of the tunnel T' while bulkheads 2 dividing the wall 1 at every specified interval in the longitudinal direction are created by the pouring of the chemicals from the pipes 4. Water in the ground in a zone section F surrounded by these wall 1 and adjacent bulkheads 2 and 2 is discharged and the tunnel (t) section in the ground and the zone section F is removed and the bulkheads 2 are removed successively, thus constructing the tunnel T having a large diameter. COPYRIGHT: (C)2004,JPO&NCIPI
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