PIPE PROPULSIVE TECHNIQUE AND JOINT STRUCTURE OF PIPE FOR PROPULSIVE TECHNIQUE

摘要

PURPOSE:To permit the mutual shrinkage of pipes, to prevent expansion and contraction and detachment, and to correspond to the variation of the ground flexibly by detachably interposing a spacer jig to the joint section of the pipes for a propulsive technique while installing a lock ring on the inserting-port section nose side. CONSTITUTION:The diameter-expanding hydraulic jack 19 of a spacer jig 17 is elongated, the diameter of a main body frame 18 is made the same as the inside diameter of a faucet section 4, and a hydraulic jack spacer 20 is stretched only by a specified distance and abutted and arranged to the inward end section 16 of the faucet section 4. An inserting section 3 is inserted into the faucet section 4 while expanding the diameter of a lock ring 7, and a stepped section 14 is positioned at a fixed distance from the lock ring 7. A rubber ring fastener 9 and a push ring 10 are clamped to the faucet section 4, and a rubber ring 8 is pushed in the axial core direction of a pipe. A ring spacer 13 is mounted, and pipes 1, 2 are propelled in the axial core direction. Accordingly, watertightness is ensured while the mutual expansion and contraction and detachment and damage of the pipes 1, 2 can be prevented.