| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel raft that is less apt to break, even if waves become high during typhoons, or the like, and that also has improved durable years. SOLUTION: The steel raft 1 is equipped with a rectangular frame body and three pieces of reinforcing members 3, bridging facing two sides of the frame body. The frame body is obtained by jointing four pieces of frame members 2 into a rectangular shape. The frame member 2 is obtained by jointing edge parts of four pieces steel plates 11 by welding so as to form a square pole. Lid plates 12 for closing the opened faces at both terminals are each welded to the opened faces. The frame body is constituted by using the four pieces of frame members 2. The four pieces of frame members 10 are jointed by welding, and the frame body 2 is formed. The steel raft 1 floats on the sea level by virtue of the buoyancy of itself. COPYRIGHT: (C)2008,JPO&INPIT
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