| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of constructing an underground wall capable of smoothly advancing an entire construction operation by reducing a load for drilling by a multi-spindle excavator even if the ground is hard, stabilizing drilling positions and drilling directions, and preventing a portion with insufficient strength which may cause the spouting of pressurized water or damage to the underground wall from being produced. SOLUTION: The portions 8 expected to be drilled by the separated spindles of the excavating spindle of a multi-spindle excavator are drilled beforehand by a single-spindle excavator having a drilling diameter smaller than the drilling diameter of the multi-spindle excavator to form preceding excavation holes 6. Then, these holes are drilled by the multi-spindle excavator, and the underground wall is constructed in the drilled holes with a soil cement. COPYRIGHT: (C)2008,JPO&INPIT
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