The present reports provides a summary of the results construction of underwater concreting by JOILUC method in the Inland Sea. The shape of the constructed structure is rectangular, and the seale is 86m length, 8m width, 2m height. The location of structure is distance from the seashore about 1000m, and formation level is 5-7m under the surface of water. Concrete was placed by concrete pumps and tremies that were fixed on a big float. The float was moored on construction site. Ready mixed concrete was used, and the admixture for under water concrete was mixed in the plant. Agitator trucks were carried by means of ferry float to the float. When rearranging the construction results, it became clear that concrete placing system combined concrete pump and tremies improves largely the efficiency of placing.
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