| 摘要 |
PURPOSE:To cause a footing to be seated on a stable ground simply and at a low cost, by a method wherein a ground excavating means is mounted to the footing installed to the lower end of the leg of a deck elevating type working platform, and a ground below the sea bottom is excavated. CONSTITUTION:A leg 2 is lifted to maximum, and when the hull part of a working platform 1 is surfacing, a filling metal 9 is removed, and a temporary casing 7 is connected to a stationary casing 6. When the hull part begins to be raised above a sea surface, a work is stopped, and an excavating member 10, such as drill bit, rotary member, is inserted into casings 7 and 6. The excavating member is connected to a driving device 11 equipped on the working platform 1 to excavate a stratum below a footing 3. This enables to perform excavation through a relatively simple device without using other working ship for exclusive use, and permits eminent increase of the workable region of the working platform. |
