| 摘要 |
PROBLEM TO BE SOLVED: To prevent movement of a horizontal direction such as earthquake, and aim at stabilization by arranging a projection/recessed shaped fitting part on upper and lower contact surfaces of a mold body so as to converge movement of the horizontal direction to a ring part cold reserving layer composed of a mold body of a laminated structure arranged on a lower part of an inner tank side plate lower part. SOLUTION: A ring part cold reserving layer 8 arranged on a lower part of an inner tank annular plate 12 just under an inner tank side plate 9, is formed by laminating mold bodies 16 which are mold-manufactured by perlite concrete and the like in a factory and the like beforehand. A fitting part 19 composed of a recessed part 17 and a projection part 18 which are fitted mutually to surfaces that are brought into contact with upper and lower parts at the time of laminating, is arranged on the mold body 16. In a lowest layer mold body 16A made of perlite concrete which is executed at a job site, ensures predetermined compression strength, and can be tightly fixed so as to suppress movement by a fixing member 15. It is thus possible to hold a stable load supporting condition without moving a ring part cold reserving layer in a horizontal direction by the earthquake.
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