| 摘要 |
PURPOSE:To exactly driven drainage members by a method in which a drainage member driver is operated while arithmetically processing data on the moving amount of a mandrel, the sending amount of drainage members, free board, tidal level, water depth, etc. CONSTITUTION:Mandrels 2a-2d are driven to a set depth point B by a driver and then drawn out, whereupon drainage members 7a-7d are driven into soft ground and cut off at the point C on the seabed. When co-rising of any of the drainage members 7a-7d occurs when drawing out the mandrels 2a-2d, it is detected by a sensor, and an anomaly signal is transmitted to a controller from a data arithmetical collecting means where data on free board (c), tidal height (d), and water depth (e) and data on time T are added to the set driving depth (b) of drainage member to stop the driver. The drainage member are again driven at the point E and drawn out to restore them to normal conditions. |
