| CPC B65D 88/02 (2013.01) [B65D 81/3881 (2013.01); B65D 88/08 (2013.01)] | 14 Claims |

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1. A method for constructing a triple shell tank including an inner tank, an intermediate tank, and an outer tank each having a roof and a side plate, the method comprising:
temporarily fixing an intermediate tank roof onto an inner tank roof to form a connected roof body;
installing a guide side plate having a predetermined height around the connected roof body;
performing a sealing process between an outer peripheral edge of the connected roof body and an inner face of the guide side plate to form a sealed space, and supplying air to the sealed space to air-raise the connected roof body; and
forming at least a part of an outer tank roof on the intermediate tank roof of the air-raised connected roof body, and installing an outer tank side plate around the guide side plate.
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