| 摘要 |
PURPOSE:To lay a conduit by a self power by inserting a piston side dividing projection between the outer cylinder side projections and exposing a taper head connected with a piston rod from an outer cylinder and attaching the projection onto an outer cylinder inside step difference and advancing the outer cylinder, together with the taper head. CONSTITUTION:A taper head 1 supporting part is connected on one side of the piston rod 4 of a, hydraulic cylinder 3, and a transmission shaft 5 for the revolution supplied from an index type hydraulic motor 6 is connected with the other side integrally on a same axis line, and an outer cylinder 2 is installed onto the taper head 1 and the hydraulic cylinder 3. When the piston rod 4 is applied with an extension operation at the not-opposed positions of the both driving projections 8 and 9, the driving projection 8 on a piston 10 side is inserted between the projection 9 on the outer cylinder 2 side, and the taper head 1 connected with the piston rod 4 is exposed from the outer cylinder 2, and the projections 8 and 9 are attached onto an outer cylinder side step difference 11, and the outer cylinder 2 is advanced. Therefore, a leading hole is formed by the self-powered drilling, and a conduit can be laid. |
