PROPULSIVE METHOD OF ROD FOR DRILLING BORING HOLE PUSHED IN BY PROPULSIVE MACHINE

摘要

PROBLEM TO BE SOLVED: To avoid buckling of a rod by a propulsive machine. SOLUTION: This engineering method is to furnish a starting vertical shaft 1 and an arriving vertical shaft 2 in a laying route of a piping, to intrude a rotating rod 4 delivered by a propulsive machine 3 set on the ground underground in a state of installing a drill head 5 on its head end, rotationally to propel the rod 4 under the ground of a target line to the arriving vertical shaft 2 by crossing the starting vertical shaft 1 by pushing force of the propulsive machine 3 and to drill a boring hole for drawing the piping. In this case, it is propelled in such a way as to push it under the ground reaching the arriving vertical shaft 2 in a state where sagging of the rod 4 in the starting vertical shaft 1 is restrained by inserting the rod 4 in a sheath pipe 11 by fixing and installing the sheath pipe 11 having an inside diameter to insert the rod 4 along in the inside of the starting vertical shaft 2.