Patent ID: 9546495
Date: 2017-01-17
CPC Classifications: B65D,E04B,E04G,E04H,F17C

Claim:
1. A method for constructing a cylindrical tank which has a metallic inner tank and a concrete outer tank, comprising: a step of building up a sidewall of the concrete outer tank in an outer circumferential edge portion of a base portion of the concrete outer tank; a step of assembling a roof portion of the concrete outer tank on the base portion of the concrete outer tank other than the outer circumferential edge portion; a step of lifting the roof portion of the concrete outer tank which is on the base portion of the concrete outer tank using a jack-up unit while the sidewall of the concrete outer tank is being built up and then holding the roof portion on the sidewall of the concrete outer tank; and a step of assembling the metallic inner tank independently of the roof portion of the concrete outer tank in a space under the roof portion of the concrete outer tank which is created due to the lifting by alternately repeating lifting of an inner tank lateral plate using the jack-up unit and attachment of a next inner tank lateral plate to a lower side of the lifted inner tank lateral plate, wherein the method further includes installing a hanging-side jack stand in the sidewall of the concrete outer tank above the roof portion of the concrete outer tank, installing a hanged-side jack stand in the roof portion of the concrete outer tank, and installing the jack-up unit across the hanging-side jack stand and the hanged-side jack stand, and the step of lifting the roof portion of the concrete outer tank includes hoisting the roof portion of the concrete outer tank using the jack-up unit, wherein positions of the hanging-side jack stand and the jack-up unit in a vertical direction can be changed during the step of lifting the roof portion of the concrete outer tank, and wherein the lifting of the roof portion of the concrete outer tank using the jack-up unit and the lifting of the inner tank lateral plate using the jack-up unit are performed independently and in parallel with each other.