| 摘要 |
PURPOSE:To propell highly accurately even in a soft ground of a poor holding force by carrying out the primary direction correcting by inclining the boring member of a leading body, and the secondary direction correcting by inclining the front part of the leading body forcibly. CONSTITUTION:By inclining a boring head 1 provided on top of a leading body 25 at a desired angle with a converting jack 5 and a driver 4, the primary direction correcting is carried out. And an inner tube 8 is combined integrally to the rear side of a cylinder 2 of the leading body 25, and an outer tube 12 is provided at the outer side placing a clearance. And the inner tube 8 is inclined to the outer tube 12 by jacks 9 to 11 and abutting projections provided on their tips, and the secondary direction correcting is carried out. |
