| 摘要 |
PURPOSE:To make it possible to greately reduce the number of supporting beams, by providing such an arrangement that the roof of an outer tank excepting at least its outer peripheral section is formed of a spherical memberance shape extending along the top surface of an inner tank. CONSTITUTION:The top of an inner tank 1 which is arranged on a heat insulator 4 laid on the bottom surface of an outer tank body 1, is reinforced by supporting beams 5 provided on the inner surface of the top of the inner tank 1. The top end of the lateral wall 6 of the outer tank body 3 is provided with a spherical membrane shaped roof plate 7 which covers over the top of the inner tank 1 and has its center section extending along the upper spherical surface of the inner tank 1. This roof plate 7 is nonself-sustaining type having no reinforcing members in the center section thereof, and therefore, the weight of the center section of the roof plate 7 is supported by the inner tank 1. In order to support the weight of the peripheral part of the roof plate 7 cantilever beams 8 are provided in the positions at which the top periphery of the lateral wall 6 are equally divided. |
