To lower the frictional resistance of the surface of a cutting edge in the case of the immersion of a caisson, to reduce the adhesion and fixing of soil on the inside of the cutting edge and to decrease the penetration resistance of the cutting edge.
The cutting edge of the caisson is coated with paints containing a solid lubricant and a silicone surface active agent. A film is composed of a substance in which paints consisting of an epoxy resin, the solid lubricant, the silicone surface active agent and an organic solvent are cured, and it is preferable that a fluoride resin solid lubricant or a graphite solid lubricant is used as the solid lubricant. The fluoride resin solid lubricant at a ratio of 5 to 100 pt.wt. or the graphite solid lubricant at the ratio of 10 to 100 pt.wt. and the silicone surface active agent at the ratio of 1 to 10 pt.wt. are contained to 100 pt.wt. in total of the epoxy resin and a curing agent.
OZOE KENICHI
TOIDA HIROSHI
SATO KAZUYOSHI
KOBAYASHI MASAKATSU
KATO KENJI
JFE METAL PRODUCTS & ENG INC
NIPPON KAGAKU TORYO KK
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