DRILLED HOLE PRECISION CORRECTING METHOD AND DRILLED HOLE PRECISION CORRECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To form an aimed drilled hole by simply correcting a side drift even when the side deviation occurs during an excavation. SOLUTION: When the tip sections of a plurality of drilling shafts 1 are dislocated from the aligning direction of the drilling shafts 1 during an excavation in drilling the ground 2 while the drilling shafts 1 aligned in a line in the lateral direction are rotated, the drilling shaft 1 located at the side end section on the opposite side to the drift direction is lowered relatively to other drilling shafts 1 for drilling, thereby the drilling shafts 1 are returned in the opposite direction to the drift direction.