| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the direct seeing ability in relation to a target of a surveying unit and the earth removing ability of a blade from being deteriorated, by helically providing a water injection pipe along the root on the propulsion direction side of the blade provided on the outer periphery of a shaft of a screw conveyor. SOLUTION: A shaft of a screw conveyor 5 serves as a pipe shaft perforating both ends, is formed by helically winding a blade on the outer periphery of the shaft, and propelled into the earth by pressing a buried pipe 6 by means of a hydraulic jack 3 while correcting the propulsion direction by directly seeing a surveying target 7 provided on a head pipe 8 through an inner cylinder of the shaft from a rotational device 9 by means of a surveying unit 7a installed behind the propulsion machine 1. Therefore, propulsion force of the buried pipe 6 is reliably secured without reducing torque of the blade caused by earth pressure, and water is injected to the propulsion tip of the ground. The long distance propulsion of a small aperture pipe is made possible in relation to the ground by realizing a facility of a water injection mechanism without deteriorating the direct seeing ability for the surveying target 7 and the earth removing ability of the blade.</p> |
