In this project, we constructed the big footings of the cablebraced bridge by our big concrete-planted vessels. We considered the most important point is how to cope with three defects of a concrete structure such as coldjoints caused by a wide area of the structure, cracks on mass concrete and rust damage caused by the salt contamination into fine sand of a reinforced concrete structure. In order to meet with this condition, first we used portland blast furnace cement B mixed with water-reducing and retarding and kneaded it with cold water. Second, we made grains of sand as equal as possible adopted sand-free from salt fixing finess modulation. Thus, we performed this works attaching importance to concrete qualities.
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