| 摘要 |
PURPOSE:To easily erect and draw out a strut for breeding sea weed by a method in which pressure water from a pump is jetted from the lower end driving pointed head while being passed through the inside of the strut and a hole is drilled in the ground or the soil pressure is degraded. CONSTITUTION:The nozzle 14 of a pump 12 set on a working ship 11 is attached to the connector 6 of a strut A. In this case, when the nozzle 14 is pushed from the tip into a holding tube 9, the notched line of the inserting portion 8 is opened, and the tip of the nozzle 14 is projected into the main tube 2. When pressure water is jetted downwards from the jet port 14a of the nozzle 14 under the condition, the pressure water passes the water path 4 in the main tube 2 and is jetted into the ground 15 from the opening 3a of the driving pointed head 3. By the jet stream, a hole 16 is formed in the ground 15, the strut A gradually goes into the ground 15, and the strut A is erected. Even when the strut A is drawn out, pressure water is jetted likewise, and thereby the strut A can be easily drawn out. |
