Method for constructing triple-shell tank

Abstract

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 includes the following procedure. An intermediate tank roof is temporarily fixed onto an inner tank roof, and further an outer tank roof is temporarily fixed onto the intermediate tank roof to form a connected roof body. An outer tank side plate having a predetermined height is installed around the connected roof body. A sealing process is performed between an outer peripheral edge of the outer tank roof and an inner face of the outer tank side plate to form a sealed space, and air is supplied to the sealed space to air-raise the connected roof body. The outer tank roof and the outer tank side plate are fixed. An inner tank side plate and an intermediate tank side plate are installed and the temporary fixing of the connected roof body is released to fix the inner tank roof and the inner tank side plate and fix the intermediate tank roof and the intermediate tank side plate.

Dependencies are inferred from the claim text.