FRPブロック化技術の研究

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For FRP ship on a small-scale damage, the reproductive technologies based on re-lamination and recoating of the damaged parts have been established. However, in the case of FRP ship on a large-scale damage, the ships are to be scrapped in many cases. Thus, this research examined the new building method of FRP ship, which has been built by solid forming so far, by dividing the ship into several parts and join them together. The method of joining is to make each block joint shear core, then seam and tense the fringe of the shear core with aramid fiber rope in spiral. This is called block joint. First, the tensile test and bending test were carried out by the basic block joint test piece. As a result, it became clear that the strength of block joint hit a peak when the number of rolls per unit length excels the constant. Next, the bending test by fabricating the framed box girder test piece of 2.5m in length, 1.0m in breadth and 1.0m in height was conducted. The result showed the test piece has the tolerance of about 280kN, which is enough for shearing and bending moment. Finally, FRP ship of 6m was designed and built by block joint method. After that, bending test at three points, drop test, ocean wave logging test and disjointing test were performed. As a consequence, block joint method has been proved to keep enough safety when applied to the ships. However, disjoining and seaming of the damaged blocks cause man-hour to no small extent, it is ascertained that the productivity cannot be secured by single part production. With the above research results, it is expected that the application of block joint method over FRP ship will contribute to a great extent in decreasing the scrapping of FRP ships.
独立行政法人海上技術安全研究所の論文
2004-12-28

FRPブロック化技術の研究

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