| 摘要 |
PURPOSE:To check the inclination of a leading body in the ground from the propeller side and a position on the circumference of a leading end inclined surface and to correct a propeller to a proper direction during propelling by observing bubbles of respective bubble tube sensors arranged in a sensor box by a position display unit during the propelling. CONSTITUTION:The leading end shaft 3a of the sensor box in a small diameter tube propeller is fixed on the leading body 1 through a pin 16, its back end shaft 3b is screwed into an intermediate shaft 5 arranged on the back of a propelling conduit and the intermediate shaft 5 is screwed into a propelling rod 6. On the other hand, a horizontal inclination detecting bubble tube sensor 7 in parallel with the propelling direction of the leading body 1 in the sensor box 3 and the bubble pipe sensors 8a, 8b for detecting the circumferential direction angle on a leading end inclined surface are arranged rectangularly to the propelling direction shaft. Respective sensors 7, 8a, 8b are connected to the bubble position display unit 11 through a signal extracting code 9 and the positions of bubbles in respective sensors 7, 8a, 8b are decided in accordance with ON/OFF of light emitting bulbs 31-36. Thus, the position of the leading body 1 in propelling can be properly corrected. |
