METHOD FOR CORRECTING PIPE BURYING DIRECTION FOR SLUDGE-PRESSURE AUGER TYPE SMALL CALIBER PIPE LAYING MACHINE AND CORRECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To make possible to correct the direction of a small-caliber pipe by reducing component members required therefor and improve the excavated earth discharging capacity with regard to a method of correcting deviation of the course of excavation in relation to a designed line in a sludge pressure auger type small-caliber pipe laying machine. ;SOLUTION: The moving cutter 15a of a cutter 15 that is driven rotationally, cut a small-diameter working face arc C, by reducing the excavation diameter R, in a direction deviating from the course of excavation (upward) during one rotation and cut a large-diameter working face arc C₂ by expanding to the original excavation diameter R at the time of direct advance excavation in the opposite direction (downward). A tapered cylinder section 11b formed in a leading pipe 11 pressed against the head 11a side, is pushed forward in a sliding contact state with the small diameter working facet arc C₁ by given pressure and thrust, the resulting wedge force drives the tapered cylinder section 11b toward the large diameter working face arc C₂ while changing its direction toward the large diameter face C₂, curving toward an arrow F and thereby corrects the deviation of the course of excavation.;COPYRIGHT: (C)1998,JPO