| 摘要 |
PURPOSE:To prevent corruption in a dumping sea area and as well to dump muck accurately in a desired position, by providing such an arrangement that a separatable bottom for closing a bottom opening is made elevatable and tiltable by means of winches positioned on both side of a hull. CONSTITUTION:There is provided a separatable bottom 2 of a boat which is water-tightly abutted against the periphery of a bottom opening 7 on the lower side of the latter. Winches 3 are laid on both sides of the bottom opening 7 so that the separatable bottom 2 may be elevated and tilted through cables 5. With this arrangement, the separatable bottom 2 may be titled near the sea bottom 10, and therefore, muck on the bottom 2 may be dumped accurately in a desired position. Thereby corruption in a dumping sea area may be also prevented.
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