Multi-layer shell tank

Abstract

The multi-layer shell can has: an inner tank; an outer tank surrounding the inner tank; a cylindrical support skirt extending in the vertical direction from the outer wall of the inner tank to the foundation; and a connecting ring that constitutes a part of the support skirt section and the outer groove, the support skirt section having a first skirt member and a second skirt member separated by the connecting ring, and the outer groove having a first outer groove member and a second outer groove member separated by the connecting ring.

Description

Technical Field

[0001] The present disclosure relates to a multi-layer shell tank, and more particularly to a supporting structure of the multi-layer shell tank. Background Art

[0002] In the past, a multilayer shell tank for storing low-temperature liquefied gas was known. The multilayer shell tank has an inner tank and an outer tank surrounding the inner tank. In the multilayer shell tank, there is a structure in which the inner tank is supported by a cylindrical support member called a support skirt. Patent document 1 discloses such a multilayer shell tank.

[0003] The multilayer shell tank of Patent Document 1 has an inner tank and an outer tank surrounding the inner tank with a cold insulation layer interposed therebetween, and the inner tank and the outer tank are supported on a foundation by a cylindrical support skirt that penetrates the bottom plate end of the outer tank and reaches the inner tank. The outer tank is composed of a hemispherical outer tank top plate, a cylindrical outer tank side plate, an outer tank main plate, and an outer tank bottom plate. An annular bottom plate connecting component is fixed to the inner periphery of the support skirt, and the outer tank bottom plate is arranged on a beam component mounted on the bottom plate connecting component. In addition, an annular main plate connecting component is fixed to the outer periphery of the support skirt, and the lower end of the outer tank main plate is connected to the main plate connecting component.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-54033 ( Figure 4 , Figure 6 ) Summary of the invention

[0007] Problems to be solved by the invention

[0008] As described above, when the support skirt penetrates the outer groove, the outer groove and the support skirt intersect in a cross shape in a vertical section, and the space near the intersection of the outer groove and the support skirt is narrow. When welding is performed on site from both sides of the joined part in such a narrow place, it is difficult to ensure sufficient working space, the operation becomes complicated, and it is also difficult to perform non-destructive inspection for confirming the welding state.

[0009] The present disclosure is completed in view of the above situation, and its purpose is to provide the following structure: in a structure in which a multi-layer shell tank has an inner groove and an outer groove and a supporting skirt supporting the inner groove is arranged in a manner of penetrating the outer groove, welding work can be avoided in a narrow place at the intersection of the outer groove and the supporting skirt.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, a multilayer shell tank in one embodiment of the present invention comprises: an inner groove; an outer groove, which surrounds the inner groove; a cylindrical supporting skirt, which extends from the outer wall of the inner groove to the foundation in the up and down directions; and a connecting ring, which constitutes a part of the supporting skirt and the outer groove, the supporting skirt having a first skirt part and a second skirt part separated by the connecting ring, and the outer groove having a first outer groove part and a second outer groove part separated by the connecting ring.

[0012] Effects of the Invention

[0013] According to the present disclosure, in a multilayer shell tank having an inner groove and an outer groove, a support skirt supporting the inner groove is arranged to penetrate the outer groove, thereby avoiding welding work at a narrow intersection of the outer groove and the support skirt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a vertical cross-sectional view of a multi-layer shell tank according to an embodiment of the present disclosure.

[0015] Figure 2 It is an enlarged vertical sectional view of the connection between the outer groove and the supporting skirt.

[0016] Figure 3 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 1.

[0017] Figure 4 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 2.

[0018] Figure 5 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 3.

[0019] Figure 6 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 4.

[0020] Figure 7 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 5.

[0021] Figure 8 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 5.

[0022] Fig. 9 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 6.

[0023] Fig.10 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove of the connection ring and the support skirt using Modification 6. DETAILED DESCRIPTION

[0024] Next, embodiments of the present disclosure will be described with reference to the drawings. Figure 1 2 is a vertical cross-sectional view of a multi-layer shell tank 1 according to an embodiment of the present disclosure. Figure 1 The multilayer shell tank 1 shown is a cryogenic container for storing cryogenic liquefied gas such as liquefied hydrogen and liquefied natural gas. The multilayer shell tank 1 is supported on a foundation 10 via a supporting skirt 2. The foundation 10 may be, for example, a hull of a liquefied gas transport ship or a concrete foundation installed on the ground.

[0025] The multilayer shell tank 1 is a spherical tank. However, the multilayer shell tank 1 is not limited to a spherical tank, and may also be a deformed spherical tank in the shape of an oblate ellipsoid, a stretched tank that is hemispherical above and below and has a cylindrical portion therebetween, or a rectangular square tank. The multilayer shell tank 1 has an inner tank 3 for storing liquefied gas and an outer tank 4 surrounding the inner tank 3. The inner tank 3 is radially separated from the outer tank 4, and the inner and outer tanks between the inner tank 3 and the outer tank 4 form an insulation layer. The inner and outer tanks may be filled with insulation material, and a vacuum insulation layer may also be provided between the inner and outer tanks. In addition, the multilayer shell tank 1 of the present embodiment is a double-layer shell tank having an inner tank 3 and an outer tank 4, but the present disclosure can also be applied to a multilayer shell tank 1 having more than three multilayer tanks.

[0026] The outer tank 4 has an outer tank lower shell 41, an outer tank upper shell 42, and a connecting ring 5 connecting the outer tank lower shell 41 and the outer tank upper shell 42. The outer tank lower shell 41 and the outer tank upper shell 42 are separated in the vertical direction by the connecting ring 5. In the case where the outer tank 4 is in the shape of a spherical shell as a whole, when the sphere of the outer shape of the outer tank 4 is cut by a horizontal cutting plane arranged between the equator and the lower pole and divided into an upper part and a lower part, the upper part (i.e., the spherical part) corresponds to the outer tank upper shell 42, and the lower part (i.e., the spherical crown part) corresponds to the outer tank lower shell 41.

[0027] The supporting skirt 2 is in the shape of a cylinder extending from the outer wall of the inner groove 3 to the foundation 10 in the vertical direction. The supporting skirt 2 includes a lower skirt 21, an upper skirt 22, and a connecting ring 5 connecting the lower skirt 21 and the upper skirt 22. The lower skirt 21 and the upper skirt 22 are separated in the vertical direction by the connecting ring 5. The connecting ring 5 serves as a component of the supporting skirt 2 and a component of the outer groove 4. The upper skirt 22 and the lower skirt 21 are cylindrical bodies that are substantially arranged in a concentric shape. The upper end of the upper skirt 22 is joined to the outer wall around the equator of the inner groove 3. The lower end 221 of the upper skirt 22 is connected to the upper end 211 of the lower skirt 21 via the connecting ring 5. The connection method of the upper skirt 22 and the connecting ring 5 is not limited to the direct connection of the upper skirt 22 and the connecting ring 5, and the upper skirt 22 and the connecting ring 5 can also be connected via the components of the outer groove 4. The lower end of the lower skirt portion 21 is joined to the foundation 10 , and the lower skirt portion 21 is vertically disposed on the foundation 10 .

[0028] The upper edge 411 of the outer tank lower shell 41 is joined to the connecting ring 5, and the outer tank lower shell 41 is supported by the supporting skirt 2 via the connecting ring 5. The lower edge 421 of the outer tank upper shell 42 is joined to the connecting ring 5, and the outer tank upper shell 42 is supported by the supporting skirt 2 via the connecting ring 5.

[0029] [Connection structure between outer groove 4 and supporting skirt 2]

[0030] Here, the connection structure between the outer groove 4 and the support skirt 2 will be described in detail. Figure 2 FIG. 4 is an enlarged vertical cross-sectional view of the connection between the outer groove 4 and the supporting skirt 2. Figure 2 As shown, the connecting ring 5 includes a first skirt joint portion 61, a second skirt joint portion 62, a first outer groove joint portion 64, and a second outer groove joint portion 63. One of the second skirt joint portion 62 and the first outer groove joint portion 64 may be omitted from the connecting ring 5.

[0031] The first skirt joint portion 61 is an annular joint surface provided at the lower part of the connecting ring 5. The first skirt joint portion 61 is joined to the upper end 211 of the lower skirt 21. The method of joining the first skirt joint portion 61 to the lower skirt 21 is, for example, welding (including fusion welding, crimping and brazing). The second skirt joint portion 62 is an annular joint surface provided at the upper part of the connecting ring 5. The second skirt joint portion 62 is joined to the lower end 221 of the upper skirt 22. The method of joining the second skirt joint portion 62 to the upper skirt 22 is, for example, welding. The first outer groove joint portion 64 is an annular joint surface provided at the inner periphery of the connecting ring 5. The first outer groove joint portion 64 is joined to the upper edge 411 of the outer groove lower shell 41. The method of joining the first outer groove joint portion 64 to the outer groove lower shell 41 is, for example, welding. The second outer groove joint portion 63 is an annular joint surface provided at the outer periphery of the connecting ring 5. The second outer tank joint portion 63 is joined to the lower edge 421 of the outer tank upper shell 42. The second outer tank joint portion 63 and the outer tank upper shell 42 are joined by, for example, welding.

[0032] The connecting ring 5 not only connects the lower skirt 21 and the upper skirt 22, but also generates a very large stress to connect the outer groove upper shell 42 and the outer groove lower shell 41, so high strength is required. The connecting ring 5 has a split structure composed of a plurality of arc blocks arranged in the circumferential direction, and is formed into a ring shape by joining the plurality of arc blocks. In order to ensure sufficient strength of the connecting ring 5, each arc block as a component of the connecting ring 5 is preferably an integral part made by cutting a thick plate.

[0033] Figure 2The illustrated connecting ring 5 (5A) integrally includes a cylindrical base 50 extending in the up-down direction, an outer ring portion 53 protruding outward from the outer wall of the base 50, and an inner ring portion 54 protruding inward from the inner wall of the base 50. Here, the radial direction toward the center of the connecting ring 5 is referred to as the "inner side", and the radial direction opposite to the inner side is referred to as the "outer side".

[0034] The base 50 of the connecting ring 5A is a cylindrical body arranged concentrically with the lower skirt 21 and the upper skirt 22. The lower skirt 21 and the upper skirt 22 separated in the vertical direction are blocked by the base 50 of the connecting ring 5A. That is, a part of the supporting skirt 2 is replaced by the connecting ring 5A. The second skirt joint 62 is provided at the upper end of the base 50, and the first skirt joint 61 is provided at the lower end of the base 50. The first skirt joint 61 and the second skirt joint 62 are larger than the maximum thickness of the outer groove 4 and separated in the vertical direction.

[0035] The vertical cross-section of the outer ring portion 53 and the inner ring portion 54 of the connecting ring 5A is a continuous arc shape. The space between the outer groove upper shell 42 and the outer groove lower shell 41 separated in the vertical direction is blocked by a part of the spherical shell formed by the outer ring portion 53, the base 50 and the inner ring portion 54. That is, a part of the spherical shell of the outer groove 4 is replaced by the connecting ring 5A. A second outer groove joint portion 63 is provided at the front end of the outer ring portion 53, and a first outer groove joint portion 64 is provided at the front end of the inner ring portion 54. The second outer groove joint portion 63 and the first outer groove joint portion 64 are larger than the maximum thickness of the outer groove 4 and separated in the vertical direction, and larger than the maximum thickness of the supporting skirt 2 and separated in the radial direction. Moreover, in the connecting ring 5A, the second outer groove joint portion 63 is arranged at a higher position than the second skirt joint portion 62, and the second outer groove joint portion 63 and the second skirt joint portion 62 are separated in the vertical direction. Moreover, the first outer groove joint portion 64 is arranged at a position lower than the first skirt joint portion 61, and the first outer groove joint portion 64 is separated from the first skirt joint portion 61 in the up-down direction. However, the second outer groove joint portion 63 may be arranged at a position lower than the second skirt joint portion 62, and the first outer groove joint portion 64 may be arranged at a position higher than the first skirt joint portion 61.

[0036] In the connection ring 5A of the above structure, the first skirt joint part 61, the second skirt joint part 62, the first outer groove joint part 64 and the second outer groove joint part 63 are separated from the apparent intersection C of the outer groove 4 and the supporting skirt 2. In addition, the apparent intersection C is the intersection line when the outer groove 4 is set as a continuous spherical shell and the supporting skirt 2 is set as a continuous cylindrical body. The outer groove 4 and the supporting skirt 2 are narrower as they are closer to the apparent intersection C. In the connection ring 5A, the base 50 and the base end of the outer ring part 53 are narrow, but the second skirt joint part 62 at the upper end of the base 50 and the second outer groove joint part 63 at the front end of the outer ring part 53 are separated in the vertical direction and radial direction. Therefore, the joint part of the second skirt joint part 62 and the upper skirt 22 at the work site is retreated from a narrow place, and the space for the joint operation of the second skirt joint part 62 and the upper skirt 22 can be ensured, and non-destructive inspection of these joint parts can also be carried out. Similarly, the joint portions between the second outer tank joint portion 63 and the outer tank upper shell 42 on site are withdrawn from a narrow space, and non-destructive inspection of these joint portions can also be performed.

[0037] In the connecting ring 5A, the space between the base 50 and the base end of the inner ring 54 is narrow, but the first skirt joint 61 at the lower end of the base 50 and the first outer groove joint 64 at the front end of the inner ring 54 are separated in the vertical direction and radial direction. Therefore, the joint part of the first skirt joint 61 and the lower skirt 21 on site is withdrawn from the narrow space, and the space for the joint operation of the first skirt joint 61 and the lower skirt 21 can be ensured, and non-destructive inspection of these joint parts can also be carried out. Similarly, the joint part of the first outer groove joint 64 and the outer groove lower shell 41 on site is withdrawn from the narrow space, and non-destructive inspection of these joint parts can also be carried out.

[0038] Hereinafter, a modification of the connection ring 5 will be described. In the description of the modification, the same reference numerals as in the drawings are given to the same or similar components as those in the above-described embodiment, and detailed description thereof will be omitted.

[0039] [Modification 1 of the connecting ring 5]

[0040] Figure 3 This is an enlarged vertical cross-sectional view of the connection between the outer groove 4 and the support skirt 2 of the connection ring 5B of Modification 1. Figure 2 In the connecting ring 5A shown in FIG. 1 , the vertical cross-section of the outer ring portion 53 and the inner ring portion 54 is formed as a circular arc that is continuous through the base portion 50. Figure 3In the connecting ring 5B shown, the vertical cross-sections of the outer ring portion 53 and the inner ring portion 54 are both arcs, but the outer ring portion 53 and the inner ring portion 54 are not continuous arcs but are staggered in the vertical direction. In such a connecting ring 5B, since the connection part of the outer ring portion 53 in the base 50 and the connection part of the inner ring portion 54 are separated in the vertical direction, the deformation of the connecting ring 5B caused by loads such as pressure can be suppressed compared to the case where the outer ring portion 53 and the inner ring portion 54 are connected at the same position in the vertical direction, thereby relieving stress. In addition, the connecting ring 5B can be manufactured by dividing into an upper section including one of the outer ring portion 53 and the inner ring portion 54 and a lower section including the other of the outer ring portion 53 and the inner ring portion 54. In this case, each section is manufactured by cutting from a thick plate, and the connecting ring 5B is manufactured by joining these sections. By dividing into an upper section and a lower section, the protrusion from the base 50 in each section is suppressed, thereby facilitating cutting from the thick plate. In addition, in Figure 3 In the connecting ring 5B shown, the connection part of the inner ring part 54 in the base 50 is located at a lower position than the connection part of the outer ring part 53, but the connection part of the inner ring part 54 in the base 50 may be located at a higher position than the connection part of the outer ring part 53.

[0041] [Modification 2 of the connecting ring 5]

[0042] Figure 4 This is an enlarged vertical cross-sectional view of the connection between the outer groove 4 and the support skirt 2 of the connection ring 5C of the second modification. Figure 2 In the connecting ring 5A shown in FIG. 1 , the vertical cross-sections of the outer ring portion 53 and the inner ring portion 54 are both arc-shaped. Figure 4 In the connecting ring 5C shown, the vertical cross-sections of the outer ring portion 53 and the inner ring portion 54 include straight sections extending in the up-down direction. In more detail, the outer ring portion 53 of the connecting ring 5C integrally includes an annular portion extending from the base 50 toward the outside and a cylindrical portion extending from the outer edge of the annular portion toward the upper side. Similarly, the inner ring portion 54 of the connecting ring 5C integrally includes an annular portion extending from the base 50 toward the inside and a cylindrical portion extending from the inner edge of the annular portion toward the lower side. Such a connecting ring 5C can be manufactured by dividing into an upper section including the outer ring portion 53 and a lower section including the other side of the inner ring portion 54. In this case, each section is manufactured by cutting from a thick plate, and the connecting ring 5C is manufactured by joining these sections. By being divisible into the upper and lower sections, the radial protrusion of the outer ring portion 53 and the inner ring portion 54 from the base portion 50 can be suppressed in each section, and the second outer groove joint portion 63 and the first outer groove joint portion 64 can be separated greatly in the vertical direction in the connecting ring 5C.

[0043] [Variation 3 of the connecting ring 5]

[0044] Figure 5This is an enlarged vertical cross-sectional view of the connection between the outer groove 4 and the support skirt 2 of the connection ring 5D of Modification 3. Figure 5 In the connecting ring 5D shown, the first skirt joint portion 61 and the second skirt joint portion 62 are arranged concentrically, but the diameter of the first skirt joint portion 61 is larger than the diameter of the second skirt joint portion 62. That is, the second skirt joint portion 62 is radially offset from the first skirt joint portion 61. Therefore, the cylinder constituting the base 50 gradually expands in diameter at the upper and lower midway portions, and the base 50 includes a lower base 51 and an upper base 52 having a smaller diameter than the lower base 51.

[0045] In addition, in the connection ring 5D of the modification 3, an inner cylinder portion 56 protruding downward from the inner wall of the base portion 50 is provided instead of the inner ring portion 54. A first outer groove joint portion 64 is provided at the front end of the inner cylinder portion 56. The inner cylinder portion 56 and the upper base portion 52 are cylinders of substantially the same diameter arranged in a concentric shape. In such a connection ring 5D, the radial protrusion amount from the base portion 50 to the inner side can be suppressed. By suppressing the radial protrusion amount from the base portion 50, the cutting process when manufacturing the arc block as a component of the connection ring 5D from a thick plate material becomes easy.

[0046] In addition, in the connection ring 5D of the modification 3, the outer ring portion 53 protruding outward from the base portion 50 has a horizontal surface. In such a connection ring 5D, the operator can use the upper part of the outer ring portion 53 as a work area to perform the joining operation of the second outer groove joint portion 63 and the outer groove upper shell 42. In addition, in the arc block as a component of the connection ring 5D, it is also possible that a molded body including the base portion 50 and the inner ring portion 54 is formed from a thick plate material by cutting, and a plate material that becomes the outer ring portion 53 is joined to the molded body by welding or the like.

[0047] [Variation 4 of the connecting ring 5]

[0048] Figure 6 This is an enlarged vertical cross-sectional view of a connection portion between the outer groove 4 and the support skirt 2 using a connection ring 5E of Modification 4. Figure 6 The connecting ring 5E shown is Figure 5 The connecting ring 5D shown is further deformed, and the outer ring portion 53 protruding outward from the outer wall of the base 50 is omitted, and a second outer groove joint portion 63 is formed on the outer wall surface of the base 50, and the second outer groove joint portion 63 is arranged at a lower position than the second skirt joint portion 62. According to such a connecting ring 5E, the radial protrusion amount from the base 50 to the inside and outside can be suppressed, and the cutting process when manufacturing the arc block as a component of the connecting ring 5E from a thick plate material becomes easy.

[0049] [Variation 5 of the connecting ring 5]

[0050] Figure 7This is an enlarged vertical cross-sectional view of the connection between the outer groove 4 and the support skirt 2 of the connection ring 5F of Modification 5. Figure 7 In the connecting ring 5F shown in FIG. 1 , a first skirt joint portion 61, a second skirt joint portion 62, a second outer groove joint portion 63, and a first outer groove joint portion 64 are provided on the base portion 50. That is, the connecting ring 5F does not have Figure 2 The outer ring portion 53 and the inner ring portion 54 of the connecting ring 5A are shown. The vertical cross-section of the base 50 of the connecting ring 5F is a rectangular shape in which the inner lower corner and the outer upper corner are ground and chamfered. A second skirt joint portion 62 is provided on the upper surface of the base 50, and a first skirt joint portion 61 is provided on the lower surface of the base 50. A first outer groove joint portion 64 is provided on the corner surface of the inner lower corner of the base 50. A second outer groove joint portion 63 is provided on the corner surface of the outer upper corner of the base 50. The distance between the first skirt joint portion 61 and the second skirt joint portion 62 is adjusted according to the height of the base 50 in the up and down direction. The distance between the second outer groove joint portion 63 and the first outer groove joint portion 64 is adjusted according to the plate thickness of the base 50. For example, as Figure 8 As shown, the vertical cross section of the base 50 of the connecting ring 5F may be formed into a rectangular shape flattened in the vertical direction. According to such a connecting ring 5F, the cutting process when manufacturing the arc block as a component of the connecting ring 5G from a thick plate material becomes extremely easy.

[0051] [Variation 6 of the connecting ring 5]

[0052] Fig. 9 This is an enlarged vertical cross-sectional view of the connection portion between the outer groove 4 and the support skirt 2 using the connection ring 5G of Modification 6. Fig. 9 The connecting ring 5G shown has an annular base 50 extending in the up-down direction, a second outer groove joint 63 is arranged at the upper end of the base 50, and a first skirt joint 61 is arranged at the lower end of the base 50. In addition, the connecting ring 5G has an inner cylinder 56 extending downward from the inner wall of the base 50. A first outer groove joint 64 is arranged at the lower end of the inner cylinder 56.

[0053] The outer tank 4 has an outer tank lower shell 41 as a first shell member, an annular plate 43 as a second shell member, and an outer tank upper shell 42 as a third shell member. In addition, not limited to this modification, in other modifications 1 to 5, the outer tank 4 may have an annular plate 43 as a second shell member, and the annular plate 43 may be joined to the second outer tank joint portion 63 of the connecting ring 5.

[0054] The annular plate 43 is joined to the second outer groove joint portion 63 in a manner of being placed on the second outer groove joint portion 63 of the connecting ring 5G. The lower edge 421 of the outer groove upper shell 42 is joined to the upper surface of the annular plate 43, and the space between the connecting ring 5G and the outer groove upper shell 42 is blocked by the annular plate 43. In addition, the lower end 221 of the upper skirt 22 is joined above the second outer groove joint portion 63 of the connecting ring 5G and to the upper surface of the annular plate 43. That is, the annular plate 43 is sandwiched between the connecting ring 5G and the upper skirt 22 in the up-down direction, and the upper skirt 22 is connected to the connecting ring 5G via the annular plate 43. In order to facilitate the joining operation of the annular plate 43 with the outer groove upper shell 42 and the upper skirt 22, it is preferred that the upper surface of the annular plate 43 is a substantially horizontal surface.

[0055] In the above-mentioned connecting ring 5G, the second outer groove joint portion 63 is arranged on the upper part of the base 50, but the second skirt joint portion 62 joined to the upper skirt portion 22 may be arranged instead of the second outer groove joint portion 63. For example, Fig.10 As shown, when the second skirt joint portion 62 is arranged on the upper part of the base 50 of the connecting ring 5G, the lower end 221 of the upper skirt 22 can be engaged with the second skirt joint portion 62, and the annular plate 43 of the outer groove 4 can be engaged with the upper skirt 22.

[0056] 〔Summarize〕

[0057] The multilayer shell tank 1 of the first item of the present disclosure comprises: an inner groove 3; an outer groove 4, which surrounds the inner groove 3; a cylindrical supporting skirt 2, which extends from the outer wall of the inner groove 3 to the foundation 10 in the up and down directions; and a connecting ring 5, which constitutes a part of the supporting skirt 2 and the outer groove 4, the supporting skirt 2 having a first skirt part and a second skirt part connected by the connecting ring 5, and the outer groove 4 having a first outer groove part and a second outer groove part connected by the connecting ring 5.

[0058] When the multilayer shell tank 1 of the first item is applied to the above embodiment, the first skirt component is the lower skirt 21, the second skirt component is the upper skirt 22, the first outer tank component is the outer tank lower shell 41, and the second outer tank component is the outer tank upper shell 42 or the annular plate 43.

[0059] According to the multilayer shell tank 1 of the above structure, the first outer groove part and the second outer groove part of the outer groove 4 can be separated by the connecting ring 5 to a degree that can avoid the narrow space of the connection part of the outer groove 4 and the supporting skirt 2. In addition, according to the multilayer shell tank 1 of the above structure, the first skirt part and the second skirt part of the supporting skirt 2 can be separated by the connecting ring 5 to a degree that can avoid the narrow space of the connection part of the outer groove 4 and the supporting skirt 2. Thereby, the concentration of the on-site joining part of the connection part of the supporting skirt 2 and the outer groove 4 can be alleviated. As a result, the joining operation of the outer groove 4 and the supporting skirt 2 can be carried out by avoiding the narrow space of the connection part of the outer groove 4 and the supporting skirt 2, and sufficient space for the joining operation can be ensured. In addition, for the same reason, sufficient space for non-destructive inspection of the joining part can be ensured.

[0060] The multilayer shell tank 1 of the second item of the present disclosure is based on the multilayer shell tank 1 of the first item, wherein the connecting ring 5 has a first skirt joint portion 61 joined to the first skirt component, a second skirt joint portion 62 joined to the second skirt component, a first outer groove joint portion 64 joined to the first outer groove component, and a second outer groove joint portion 63 joined to the second outer groove component.

[0061] When the multilayer shell tank 1 of the second item is applied to the above embodiment, the first skirt component is the lower skirt 21, the second skirt component is the upper skirt 22, the first outer tank component is the outer tank lower shell 41, and the second outer tank component is the outer tank upper shell 42 or the annular plate 43.

[0062] The multilayer shell tank 1 of the third item of the present disclosure is according to the multilayer shell tank 1 of the second item, wherein the connecting ring 5 comprises: a cylindrical base 50 having a first skirt joint portion 61 at an upper end and a second skirt joint portion 62 at a lower end; an inner ring portion 54 or an inner tube portion 56, which protrudes inward from the base 50 and has a first outer groove joint portion 64 at a front end; and an outer ring portion 53, which protrudes outward from the base 50 and has a second outer groove joint portion 63 at a front end.

[0063] In this way, the connecting ring 5 can be realized relatively simply.

[0064] The multilayer shell tank 1 according to a fourth aspect of the present disclosure is the multilayer shell tank 1 according to the third aspect, wherein the outer ring portion 53 of the connecting ring 5 has a horizontal surface.

[0065] Thus, since the outer ring portion 53 has a horizontal surface, the horizontal surface of the outer ring portion 53 can be used as a scaffold for the joining operation with the second outer tank member. Thus, the joining operation between the outer tank 4 and the support skirt portion 2 can be stabilized.

[0066] The multilayer shell tank 1 of the 5th item of the present disclosure is based on the multilayer shell tank 1 of the 1st item, wherein the connecting ring 5 has a first skirt joint portion 61 joined to the first skirt component, a first outer groove joint portion 64 joined to the first outer groove component, and a second outer groove joint portion 63 joined to the second outer groove component, and the second skirt component is joined to the second outer groove component.

[0067] When the multilayer shell tank 1 of the fifth item is applied to the above embodiment, the first skirt member is the lower skirt 21 , the second skirt member is the upper skirt 22 , the first outer tank member is the outer tank lower shell 41 , and the second outer tank member is the annular plate 43 .

[0068] In addition, the multilayer shell tank 1 of the 6th item of the present disclosure is based on the multilayer shell tank 1 of the 1st item, wherein the connecting ring 5 has a first skirt joint portion 61 joined to the first skirt component, a first outer groove joint portion 64 joined to the first outer groove component, and a second skirt joint portion 62 joined to the second skirt component, and the second outer groove component is joined to the second skirt component.

[0069] When the multilayer shell tank 1 of item 6 is applied to the above embodiment, the first skirt member is the lower skirt 21 , the second skirt member is the upper skirt 22 , the first outer tank member is the outer tank lower shell 41 , and the second outer tank member is the annular plate 43 .

[0070] The multilayer shell tank 1 according to claim 7 of the present disclosure is the multilayer shell tank 1 according to any one of claims 2 to 6, wherein in the connecting ring 5, the first skirt joint portion 61 and the first outer groove joint portion 64 are located at different positions in the vertical direction.

[0071] In this way, the first skirt joint portion 61 and the first outer groove joint portion 64 are separated in the up-down direction, thereby making it possible to secure a larger space for the joining operation of the support skirt 2 and the outer groove 4 .

[0072] The multilayer shell tank 1 according to item 8 of the present disclosure is the multilayer shell tank 1 according to any one of items 2 to 4, wherein in the connecting ring 5, the second skirt joint portion 62 and the second outer groove joint portion 63 are located at different positions in the vertical direction.

[0073] In this way, the second skirt joint part 62 and the second outer groove joint part 63 are separated in the up and down directions, thereby ensuring a larger space for the joining operation of the second outer groove joint part 63 and the outer groove upper shell 42 and the joining operation of the second skirt joint part 62 and the upper skirt 22.

[0074] The multilayer shell tank 1 of item 9 of the present disclosure is based on the multilayer shell tank 1 of item 5, wherein the connecting ring 5 has a first skirt joint portion 61 arranged at the lower end, a second outer groove joint portion 63 arranged at the upper end, and a first outer groove joint portion 64 arranged at a position closer to the inner circumference than the above-mentioned first skirt joint portion 61, and the outer groove 4 has a first outer groove part, a second outer groove part and a third outer groove part, the second outer groove part is an annular plate 43, and the second skirt part and the third outer groove part are joined to the upper surface of the annular plate 43.

[0075] In such a connecting ring 5, the thickness of the base 50 of the connecting ring 5 can be suppressed, and the arc block as a component of the connecting ring 5 can be easily manufactured. In addition, since the second skirt member and the third outer groove member are joined to the annular plate 43, the annular plate 43 can be used as a scaffold for the operation when the second skirt member and the third outer groove member are connected to the annular plate 43, and the stability of the operation can be improved.

[0076] The multilayer shell tank 1 of the 10th item of the present disclosure is based on the multilayer shell tank 1 of the 2nd item, wherein the vertical cross-section of the connecting ring 5 is a rectangle with chamfered outer upper corners and inner lower corners, a second skirt joint 62 is arranged at the upper part of the rectangle, a first skirt joint 61 is arranged at the lower part of the rectangle, a second outer groove joint 63 is arranged on the corner surface of the chamfered outer upper corner of the rectangle, and a first outer groove joint 64 is arranged on the corner surface of the chamfered inner lower corner of the rectangle.

[0077] In this way, the connecting ring 5 can be realized very simply.

[0078] The above discussion of the present disclosure is presented for the purpose of illustration and description, and is not intended to limit the present disclosure to the methods disclosed in this specification. For example, in the above detailed description, various features of the present disclosure are summarized into one embodiment for the purpose of rationalizing the present disclosure, but several of the multiple features may be combined. In addition, the multiple features included in the present disclosure may also be combined with alternative embodiments, structures or methods other than those described above.

Claims

1. A multilayer shell tank, comprising: Inner tank; an outer tank surrounding the inner tank; a cylindrical supporting skirt extending from the outer wall of the inner tank to the foundation in the vertical direction; and a connecting ring constituting a part of the supporting skirt and the outer groove, The supporting skirt has a first skirt component and a second skirt component separated by the connecting ring, and the outer groove has a first outer groove component and a second outer groove component separated by the connecting ring.

2. The multilayer shell tank according to claim 1, wherein: The connecting ring has a first skirt joint portion joined to the first skirt member, a second skirt joint portion joined to the second skirt member, a first outer groove joint portion joined to the first outer groove member, and a second outer groove joint portion joined to the second outer groove member.

3. The multilayer shell tank according to claim 2, wherein: The connecting ring has: a tubular base having the first skirt joint portion at the upper end and the second skirt joint portion at the lower end; an inner ring portion or an inner cylinder portion, which protrudes inward from the base portion and has the first outer groove engaging portion at the front end; and The outer ring portion protrudes outward from the base portion and has the second outer groove engaging portion at the front end.

4. The multilayer shell tank according to claim 3, wherein: The outer ring portion of the connecting ring has a horizontal surface.

5. The multi-layer shell tank according to claim 1, wherein: The connecting ring has a first skirt engaging portion engaged with the first skirt member, a first outer groove engaging portion engaged with the first outer groove member, and a second outer groove engaging portion engaged with the second outer groove member, and the second skirt member is engaged with the second outer groove member.

6. The multi-layer shell tank according to claim 1, wherein: The connecting ring has a first skirt engaging portion engaged with the first skirt member, a first outer groove engaging portion engaged with the first outer groove member, and a second skirt engaging portion engaged with the second skirt member. The second outer groove member is engaged with the second skirt member.

7. The multilayer shell tank according to any one of claims 2 to 6, wherein: In the connecting ring, the first skirt joint portion and the first outer groove joint portion are located at different positions in the up-down direction.

8. The multilayer shell tank according to any one of claims 2 to 4, wherein: In the connecting ring, the second skirt joint portion and the second outer groove joint portion are located at different positions in the up-down direction.

9. The multi-layer shell tank according to claim 5, wherein: The connecting ring has the first skirt joint portion arranged at the lower end, the second outer groove joint portion arranged at the upper end, and the first outer groove joint portion arranged at a position closer to the inner circumference than the first skirt joint portion. The outer tank includes the first outer tank member, the second outer tank member, and a third outer tank member. The second outer tank member is an annular plate, and the second skirt member and the third outer tank member are joined to the upper surface of the annular plate.

10. The multi-layer shell tank according to claim 2, wherein: The vertical cross-section of the connecting ring is a rectangle with chamfered outer upper corners and inner lower corners, the second skirt joint portion is arranged at the upper part of the rectangle, the first skirt joint portion is arranged at the lower part of the rectangle, the second outer groove joint portion is arranged on the chamfered corner surface of the outer upper corner of the rectangle, and the first outer groove joint portion is arranged on the chamfered corner surface of the inner lower corner of the rectangle.

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