Abstract: A blanket installation method includes: a transporting step of transporting a blanket unit (1), in which a blanket (2) and a transport jig (3) are integrally coupled, between an inner tank (60) and an outer tank (50) of a double shell structure tank in a suspended condition; and a mounting step of mounting the blanket unit (1) on a shell plate of the inner tank (60). The transport jig (3) is formed by attaching a blanket fixing pin (34) to a jig main body (3A) through pin coupling. The blanket (2) is held at the blanket fixing pin (34).

Abstract: A method for constructing a cylindrical tank which has a metallic inner tank and a concrete outer tank includes a step of building up a PC wall in an outer circumferential edge portion of a base plate, a step of assembling an outer tank roof on the base plate other than the outer circumferential edge portion of the base plate, a step of lifting the outer tank roof which is on the base plate using a jack-up unit while the PC wall is being built up and then holding the outer tank roof on the PC wall, and a step of assembling the inner tank independently of the outer tank roof in a space under the outer tank roof which is created due to the lifting.

Abstract: A method of constructing a cylindrical tank that has an inner tank made of metal and an outer tank made of concrete has a step of building a PC wall (3) by erecting lateral liners (4) sequentially from the bottommost layer to the topmost layer on an outer circumferential edge portion of a base plate, and pouring concrete (5) so as to follow the erecting of the lateral liners (4) with the lateral liners (4) being used as an inner side forming frame.

Abstract: Provided is a blanket installation method, which includes a transporting step of transporting a blanket unit (1), in which the blanket (2) and a transport jig (3) are coupled in one body, between an inner tank (60) and an outer tank in a double shell tank, in a suspended condition, and a mounting step of mounting the blanket unit on a shell plate of the inner tank. According to the method, in the event of installing work of the blanket, the improvement in work efficiency and safety can be achieved.

Abstract: A method of constructing a cylindrical tank that has an inner tank made of metal and an outer tank made of concrete has a step of building a PC wall (3) by erecting lateral liners (4) sequentially from the bottommost layer to the topmost layer on an outer circumferential edge portion of a base plate, and pouring concrete (5) so as to follow the erecting of the lateral liners (4) with the lateral liners (4) being used as an inner side forming frame.

Abstract: A method for constructing a cylindrical tank which has a metallic inner tank and a concrete outer tank includes a step of building up a PC wall in an outer circumferential edge portion of a base plate, a step of assembling an outer tank roof on the base plate other than the outer circumferential edge portion of the base plate, a step of lifting the outer tank roof which is on the base plate using a jack-up unit while the PC wall is being built up and then holding the outer tank roof on the PC wall, and a step of assembling the inner tank independently of the outer tank roof in a space under the outer tank roof which is created due to the lifting.

Abstract: A blanket installation method includes: a transporting step of transporting a blanket unit (1), in which a blanket (2) and a transport jig (3) are integrally coupled, between an inner tank (60) and an outer tank (50) of a double shell structure tank in a suspended condition; and a mounting step of mounting the blanket unit (1) on a shell plate of the inner tank (60). The transport jig (3) is formed by attaching a blanket fixing pin (34) to a jig main body (3A) through pin coupling. The blanket (2) is held at the blanket fixing pin (34).

Abstract: Provided is a blanket installation method, which includes a transporting step of transporting a blanket unit (1), in which the blanket (2) and a transport jig (3) are coupled in one body, between an inner tank (60) and an outer tank in a double shell tank, in a suspended condition, and a mounting step of mounting the blanket unit on a shell plate of the inner tank. According to the method, in the event of installing work of the blanket, the improvement in work efficiency and safety can be achieved.

Abstract: To provide an apparatus for measuring chromatic dispersion when modulating frequency of a variable wavelength light source is different from modulating frequency of a fixed wavelength light source for reference.

Abstract: To provide an apparatus for measuring chromatic dispersion when modulating frequency of a variable wavelength light source is different from modulating frequency of a fixed wavelength light source for reference.