WO2024062623A1 - Multi-shell tank - Google Patents

Multi-shell tank Download PDF

Info

Publication number
WO2024062623A1
WO2024062623A1 PCT/JP2022/035480 JP2022035480W WO2024062623A1 WO 2024062623 A1 WO2024062623 A1 WO 2024062623A1 JP 2022035480 W JP2022035480 W JP 2022035480W WO 2024062623 A1 WO2024062623 A1 WO 2024062623A1
Authority
WO
WIPO (PCT)
Prior art keywords
skirt
tank
shell
outer tank
connecting member
Prior art date
Application number
PCT/JP2022/035480
Other languages
French (fr)
Japanese (ja)
Inventor
太一郎 下田
祐介 清水
晴彦 冨永
和宏 黒田
邦彦 持田
森 田中
正義 猪原
Original Assignee
川崎重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 川崎重工業株式会社 filed Critical 川崎重工業株式会社
Priority to PCT/JP2022/035480 priority Critical patent/WO2024062623A1/en
Publication of WO2024062623A1 publication Critical patent/WO2024062623A1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels

Definitions

  • the present disclosure relates to a multi-shell tank, and specifically relates to a support structure for a multi-shell tank.
  • multi-shell tanks for storing low-temperature liquefied gas have been known.
  • the multi-shell tank includes an inner tank and an outer tank surrounding the inner tank.
  • Some multi-shell tanks have an inner tank supported by a cylindrical support member called a support skirt.
  • Patent Document 1 discloses this type of multi-shell tank.
  • the multi-shell tank (double-shell cylindrical low-temperature storage tank) of Patent Document 1 includes an inner tank and an outer tank that surrounds the inner tank via a cold insulation layer, and the inner tank penetrates through the end of the bottom plate of the outer tank.
  • the inner tank and outer tank are supported on the foundation by a cylindrical support skirt that extends to the bottom.
  • the outer tank is composed of a hemispherical outer tank roof plate, a cylindrical outer tank side plate, an outer tank body plate, and an outer tank bottom plate.
  • a ring-shaped bottom plate connection member is fixed to the inner periphery of the support skirt, and an outer tank bottom plate is disposed on a beam member attached to this bottom plate connection member.
  • a ring-shaped body plate connecting member is fixed to the outer periphery of the support skirt, and a lower end portion of the outer tank body plate is connected to this body plate connecting member.
  • a multi-shell tank having an outer tank support structure in which an outer tank plate is joined to a support skirt via a connecting member as disclosed in Patent Document 1
  • the support skirt and the connecting member are joined together and the connecting member and the outer tank plate are joined during construction. It is appropriate that the connection with the material be performed at the construction site.
  • a connecting member is welded to the outer peripheral surface of the support skirt, and then the connecting member and the outer tank plate material are welded. In this case, welding between the support skirt and the connecting member is performed in a horizontal position, which is relatively difficult.
  • multi-shell tanks have tended to become larger, and in large multi-shell tanks, the connecting members that are joined to the support skirt are also heavy, making it more difficult to join the support skirt and the connecting members. It will be of high quality.
  • the present disclosure has been made in view of the above circumstances, and an object thereof is to provide a multi-shell tank having an outer tank support structure in which an outer tank board is joined to a support skirt via a connecting member, and which is easy to construct on-site.
  • the goal is to suggest ways to improve the situation.
  • a multi-shell tank comprises: An inner tank, An outer tank surrounding the inner tank; A cylindrical inner skirt extending in a vertical direction from an outer wall of the inner tank to a foundation; a connecting member interposed between the inner skirt and the outer tub to connect the inner skirt and the outer tub,
  • the outer shell has an outer shell upper shell and an outer shell lower shell arranged below the outer shell upper shell,
  • the inner skirt has an upper skirt and a lower skirt disposed below the upper skirt,
  • the connecting member is an annular plate having an inner edge portion joined to the upper skirt and the lower skirt while being sandwiched between the upper skirt and the lower skirt in the vertical direction, and an outer edge portion joined to the lower edge of the outer shell upper shell.
  • a multi-shell tank having an outer tank support structure in which an outer tank plate is joined to a support skirt via a connecting member, and which can improve field workability.
  • FIG. 1 is a vertical cross-sectional view of a multi-shell tank according to a first embodiment of the present disclosure.
  • FIG. 2 is an enlarged vertical cross-sectional view of the connection between the outer shell and the support skirt of the multi-shell tank according to the first embodiment.
  • FIG. 3 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the support skirt of the multi-shell tank according to Modification 1 of the first embodiment.
  • FIG. 4 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the support skirt of the multi-shell tank according to Modification 1 of the first embodiment.
  • FIG. 5 is a vertical cross-sectional view of a multi-shell tank according to a second embodiment of the present disclosure.
  • FIG. 6 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the inner tank and the support skirt of the multi-shell tank according to the second embodiment.
  • FIG. 7 is an enlarged vertical cross-sectional view of a connecting portion between the outer tank, the inner tank, and the support skirt of a multi-shell tank according to a modification of the second embodiment.
  • Fig. 1 is a vertical cross-sectional view of a multi-shell tank 1 according to a first embodiment of the present disclosure.
  • the multi-shell tank 1 shown in Fig. 1 is a cryogenic container for storing low-temperature liquefied gas such as liquefied hydrogen or liquefied natural gas.
  • the multi-shell tank 1 is supported on a foundation 10 via a support skirt 2.
  • the foundation 10 may be, for example, the hull of a liquefied gas carrier, the structure of a floating structure such as a barge or floating storage facility, or a concrete base installed on the ground.
  • the multi-shell tank 1 is a spherical tank.
  • the multi-shell tank 1 is not limited to a spherical tank, and may be a deformed spherical tank in the shape of a prolate ellipsoid, a stretch tank having a cylindrical portion between the top and bottom, or a rectangular tank in the shape of a rectangular parallelepiped.
  • the multi-shell tank 1 includes an inner tank 3 that contains liquefied gas, and an outer tank 4 that surrounds the inner tank 3.
  • the inner tank 3 and the outer tank 4 are radially separated, and an insulating layer is formed between the inner tank 3 and the outer tank 4.
  • the multi-shell tank 1 is a double-shell tank that includes an inner tank 3 and an outer tank 4, but the present disclosure is also applicable to a multi-shell tank 1 that includes three or more tanks.
  • the outer tank 4 consists of an outer tank upper shell 41 and an outer tank lower shell 42.
  • the outer tank 4 is a spherical shell
  • the outer shape of the outer tank 4 is cut along a horizontal cutting plane placed between the equator and the lower pole and divided into an upper part and a lower part
  • the upper part i.e., the bulbous part
  • the lower part i.e., the bulbous crown part
  • the support skirt 2 has a cylindrical shape extending vertically from the outer wall of the inner tank 3 to the foundation 10 as a whole.
  • the support skirt 2 divides the outer tank 4 into an outer tank upper shell 41 and an outer tank lower shell 42.
  • the support skirt 2 consists of an upper skirt 22 and a lower skirt 21.
  • the upper skirt 22 and the lower skirt 21 are cylindrical bodies of substantially the same diameter and arranged concentrically.
  • the upper end of the upper skirt 22 is joined to the outer wall around the equator of the inner tank 3.
  • the lower end 221 of the upper skirt 22 is connected to the upper end 211 of the lower skirt 21 via a connecting member 5.
  • the lower end of the lower skirt 21 is joined to the foundation 10, and the lower skirt 21 is erected on the foundation 10.
  • the upper edge of the outer tank lower shell 42 is joined to the inner wall of the lower skirt 21, and the outer tank lower shell 42 is supported by the lower skirt 21.
  • a lower edge 411 of the outer tank upper shell 41 is connected to the support skirt 2 via the connecting member 5. In this way, the connecting portion of the outer tank upper shell 41 and the connecting portion of the outer tank lower shell 42 in the support skirt 2 are separated from each other in the vertical direction.
  • FIG. 2 is an enlarged vertical sectional view of the connecting portion between the outer tank 4 and the support skirt 2 of the multi-shell tank 1 according to the first embodiment. As shown in FIG. 2, the lower edge 411 of the outer tank upper shell 41 and the support skirt 2 are connected by a connecting member 5.
  • the connecting member 5 is an annular plate 50 having a surface substantially perpendicular to the vertical direction.
  • the outer diameter of the annular plate 50 is substantially the same as the outer diameter of the outer tank upper shell 41.
  • the inner diameter of the annular plate 50 is substantially the same as the outer diameter of the support skirt 2.
  • An inner edge 50a of the annular plate 50 is a joint with the support skirt 2, and an outer edge 50b of the annular plate 50 is a joint with the outer tank upper shell 41.
  • the upper surface of the inner edge 50a of the annular plate 50 is joined to the lower end 221 of the upper skirt 22.
  • the lower surface of the inner edge 50a of the annular plate 50 is joined to the upper end 211 of the lower skirt 21. That is, the inner edge portion 50a of the annular plate 50 is fixed to the lower skirt 21 and the upper skirt 22 while being sandwiched between the lower skirt 21 and the upper skirt 22 in the vertical direction.
  • the upper surface of the outer edge 50b of the annular plate 50 and the lower edge 411 of the outer tank upper shell 41 are joined.
  • the outer tank upper shell 41 and the annular plate 50 are preferably joined after the lower skirt 21 and the annular plate 50 are joined.
  • a worker performs the work using the annular plate 50 as a foothold.
  • the annular plate 50 can support a worker and a working machine, and fully functions as a scaffold for the worker to perform work.
  • the connecting member 5 and the outer tank upper shell 41 can be welded in a downward position, which reduces the difficulty of the work and improves workability on site.
  • the annular plate 50 that is the connecting member 5 has a surface (that is, a horizontal surface) that is substantially orthogonal to the vertical direction, but the annular plate 50 may have a slight inclination from the horizontal surface.
  • the annular plate 50 is joined to the lower skirt 21 and the upper skirt 22 of the support skirt 2, and the outer tank upper shell 41, with the outer edge 50b of the annular plate 50 being higher than the inner edge 50a. Even if the annular plate 50 has an inclination from the horizontal in this way, as long as the inclination is within a range that allows the annular plate 50 to be placed on the lower skirt 21, the same effect as described above can be obtained in terms of workability of the joining work. can get.
  • FIG. 3 is an enlarged vertical cross-sectional view of the connection portion between the outer tank 4 and the support skirt 2 of the multi-shell tank 1 according to Modification 1 of the first embodiment.
  • the connection member 5 of the multi-shell tank 1 according to the first modification includes an outer ring part 51, an inner ring part 53 disposed upwardly or downwardly away from the outer ring part 51, and an outer ring. It is an annular plate 50B having a cylindrical portion 52 that connects the portion 51 and the inner ring portion 53 in the vertical direction.
  • An outer edge portion of the outer ring portion 51 is an outer edge portion 50b that is joined to the outer tank upper shell 41.
  • An inner edge portion of the inner ring portion 53 is an inner edge portion 50a that is joined to the support skirt 2.
  • the main surface of the outer ring section 51 and the end surface of the cylindrical section 52 are joined, and the end surface of the cylindrical section 52 and the main surface of the inner ring section 53 are joined.
  • the outer ring part 51 is arranged above the inner ring part 53, the lower surface of the inner edge of the outer ring part 51 and the upper end of the cylindrical part 52 are joined, and the lower end of the cylindrical part 52 and the upper surface of the outer edge of the inner ring portion 53 are joined.
  • the outer ring portion 51 is disposed below the inner ring portion 53, the upper surface of the inner edge of the outer ring portion 51 and the lower end of the cylindrical portion 52 are joined, and the upper end of the cylindrical portion 52 and the lower end of the inner ring portion 53 are joined.
  • the lower surface of the outer edge is joined.
  • annular plate 50B having the above configuration, when the outer edge 50b to which the outer tank 4 is joined is displaced relative to the inner edge 50a to which the support skirt 2 is joined, the annular plate 50B (particularly the outer ring By elastically deforming the portion 51 and the inner ring portion 53), relative displacement of the outer edge portion 50b with respect to the inner edge portion 50a is actively permitted. Therefore, when a relative displacement occurs between the lower edge 411 of the outer tank upper shell 41 and the upper end 211 of the lower skirt 21 of the support skirt 2 (or the lower end 221 of the upper skirt 22), the outer tank upper The stress acting on the joints between the shell 41 and the annular plate 50B and between the annular plate 50B and the support skirt 2 is reduced.
  • connection member 5 having a displacement absorption function is not limited to the annular plate 50B shown in FIG. 3, but may include, for example, a protrusion 58 or a bellows continuous in the circumferential direction in the radial center portion as shown in FIG.
  • the annular plate 50C may be used.
  • FIG. 5 is a vertical cross-sectional view of a multi-shell tank 1B according to a second embodiment of the present disclosure.
  • the multi-shell tank 1B according to the second embodiment differs from the multi-shell tank 1 according to the first embodiment in that it further includes an outer skirt 6 that supports the outer tank 4.
  • the support skirt 2 included in the multi-shell tank 1 of the first embodiment is referred to as the "inner skirt 2" to distinguish it from the outer skirt 6.
  • an outer skirt 6 is arranged on the outer peripheral side of the inner skirt 2.
  • the outer skirt 6 is arranged concentrically with the inner skirt 2 and is a cylindrical body having a larger diameter than the inner skirt 2.
  • the lower end 62 of the outer skirt 6 is joined to the foundation 10, and the outer skirt 6 is erected on the foundation 10.
  • a lower end 62 of the outer skirt 6 is connected to a lower edge 411 of the outer tank upper shell 41 of the outer tank 4.
  • the outer tank upper shell 41 of the outer tank 4 of the multi-shell tank 1B according to the second embodiment does not have a rounded shape like the first embodiment, but is continuous with the hemispherical shell part 412 and the lower end of the hemispherical shell part 412. It consists of a cylinder body part 413.
  • the outer diameters of the hemispherical shell part 412 and the cylinder body part 413 are substantially the same, and the hemispherical shell part 412 and the cylinder body part 413 are smoothly connected in the vertical direction.
  • the lower end of the barrel portion 413 is the lower edge 411 of the outer tank upper shell 41.
  • the outer diameter of the outer skirt 6 and the outer diameter of the barrel portion 413 of the outer tank 4 are substantially the same, and these are arranged concentrically. Therefore, the cylinder body 413 of the outer tank 4 is placed on the outer skirt 6.
  • FIG. 6 is an enlarged vertical sectional view of the connection portion between the outer tank 4 and the inner tank 3 and the support skirt 2 of the multi-shell tank 1B according to the second embodiment.
  • the connection member 5 of the multi-shell tank 1B according to the present embodiment may be an annular plate 50 similarly to the multi-shell tank 1 according to the first embodiment.
  • the inner skirt 2 includes a lower skirt 21, an upper skirt 22, and a connecting ring 23 that connects the lower skirt 21 and the upper skirt 22.
  • the inner edge 50a of the annular plate 50 is sandwiched between the upper skirt 22 of the inner skirt 2 and the connecting ring 23 from above and below, and has a lower surface joined to the connecting ring 23 and an upper surface joined to the upper skirt 22.
  • An outer tank lower shell 42 is connected to the connection ring 23 . Further, the outer edge portion 50b of the annular plate 50 is sandwiched between the outer tank upper shell 41 and the outer skirt 6 from above and below, and the upper surface is joined to the lower edge 411 of the outer tank upper shell 41, and the lower surface is connected to the outer skirt 6. It is joined to the upper end 61 of. In this way, the annular plate 50 penetrates the inner skirt 2 in a substantially horizontal direction, and also penetrates in a substantially horizontal direction between the outer tank upper shell 41 of the outer tank 4 and the outer skirt 6.
  • the outer tank lower shell 42 and the inner tank 3 are supported by the inner skirt 2, and the outer tank upper shell 41 is supported by the outer skirt 6.
  • the connecting member 5 of the multi-shell tank 1B does not bear the load of the inner tank 3 and the outer tank 4, and the connecting member 5 mainly airtightly closes the space between the inner and outer tanks of the inner tank 3 and the outer tank upper shell 41. play a role.
  • the components of the lower skirt 21 of the inner skirt 2 and the components of the outer skirt 6 are turned upside down, and these components are placed on the annular plate 50. It is preferable to weld the components of the lower skirt 21 and the annular plate 50 and the components of the outer skirt 6 and the annular plate 50. Thereby, these welding operations can be performed stably. Further, with the upper skirt 22 and the outer tank upper shell 41 placed on the annular plate 50 to which the constituent elements of the lower skirt 21 and the outer skirt 6 are joined, the upper skirt 22 and the annular plate 50 are welded together. Then, the outer tank upper shell 41 and the annular plate 50 are welded. During the welding work between the upper skirt 22 and the annular plate 50 and the welding work between the outer tank upper shell 41 and the annular plate 50, the operator can use the top of the annular plate 50 as a foothold.
  • connection member 5 described in the modification of the first embodiment can also be employed in the multi-shell tank 1B according to the second embodiment.
  • the connecting member 5 that connects the inner skirt 2, the outer tank upper shell 41, and the outer skirt 6 allows elastic deformation in the vertical direction.
  • An annular plate 50B may be used.
  • the multi-shell tank 1, 1B is An inner tank 3; An outer tank 4 surrounding the inner tank 3; A cylindrical inner skirt 2 extending vertically from the outer wall of the inner tank 3 to the foundation 10; A connecting member 5 is provided between the inner skirt 2 and the outer tub 4 to connect the inner skirt 2 and the outer tub 4.
  • the outer tub 4 has an outer tub upper shell 41 and an outer tub lower shell 42 arranged below the outer tub upper shell 41.
  • the inner skirt 2 has an upper skirt 22 and a lower skirt 21 arranged below the upper skirt 22,
  • the connecting member 5 is an annular plate 50 having an inner edge portion 50a joined to the upper skirt 22 and the lower skirt 21 while being sandwiched vertically between the upper skirt 22 and the lower skirt 21, and an outer edge portion 50b joined to the lower edge 411 of the outer tank upper shell 41.
  • the connecting member 5 joined to the inner skirt 2 as described above can serve as a foothold when welding the connecting member 5 and the outer tank upper shell 41.
  • the posture of the worker on the annular plate 50 is stabilized, and it becomes possible to run an automatic welding machine and perform positioning work using a jack. It is expected to improve welding quality and work precision. Furthermore, if the worker uses the connecting member 5 as a foothold, the connecting member 5 and the outer tank upper shell 41 can be welded in a downward position, which reduces the difficulty of the work and improves workability on site.
  • the multi-shell tank 1B according to the second item of the present disclosure has the following features in the multi-shell tank 1, 1B according to the first item: Further comprising a cylindrical outer skirt 6 disposed outside the inner skirt 2 and extending vertically from the lower edge 411 of the outer tank upper shell 41 to the foundation 10, The outer edge portion 50b of the annular plate 50 is joined to the outer tank upper shell 41 and the outer skirt 6 while being sandwiched between the outer tank upper shell 41 and the outer skirt 6 in the vertical direction.
  • the multi-shell tank 1B according to the third aspect of the present disclosure is the multi-shell tank 1B according to the second aspect, wherein the outer tank upper shell 41 has a hemispherical shell portion 412 and a cylindrical body portion 413 connected below the hemispherical shell portion 412.
  • the outer diameters of the cylindrical body portion 413 and the outer skirt 6 are substantially the same, and the lower end of the cylindrical body portion 413 and the outer skirt 6 are connected with the connecting member 5 sandwiched therebetween.
  • outer skirt 6 and the barrel portion 413 of the outer tank upper shell 41 form a vertically continuous cylindrical body, so that the outer tank upper shell 41 is stably supported by the outer skirt 6.
  • the multi-shell tank 1, 1B according to the fourth item of the present disclosure is a multi-shell tank 1, 1B according to any one of the first to third items, in which the connecting member 5 has a deformation-permitting portion that allows the outer edge portion 50b to be displaced relative to the inner edge portion 50a by elastic deformation.
  • the multi-shell tank 1, 1B according to the fourth item of the present disclosure is a multi-shell tank 1, 1B according to any one of the first to fourth items, in which the connecting member 5 has an inner ring portion 53 including an inner edge portion 50a, an outer ring portion 51 that is positioned vertically away from the inner ring portion 53 and includes an outer edge portion 50b, and a tubular portion 52 that vertically connects the inner ring portion 53 and the outer ring portion 51 while being sandwiched between the inner ring portion 53 and the outer ring portion 51.
  • connecting member 5 Since the connecting member 5 has a shape that allows relative displacement between the connected parts, stress generated in the connecting member 5 and the connected parts can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

This multi-shell tank has an inner tank, an outer tank surrounding the inner tank, a cylindrical inner skirt that extends vertically from the outer wall of the inner tank to a foundation, and a connecting member interposed between the inner skirt and the outer tank to connect the inner skirt and the outer tank. The outer tank has an outer tank upper shell and an outer tank lower shell disposed below the outer tank upper shell. The inner skirt has an upper skirt and a lower skirt disposed below the upper skirt. The connecting member is an annular plate having an inner edge portion joined to the upper skirt and the lower skirt while being sandwiched in the vertical direction by the upper skirt and the lower skirt, and an outer edge portion joined to the lower edge of the outer tank upper shell.

Description

多重殻タンクmulti-shell tank
　本開示は、多重殻タンクに関し、詳細には多重殻タンクの支持構造に関する。 TECHNICAL FIELD The present disclosure relates to a multi-shell tank, and specifically relates to a support structure for a multi-shell tank.
　従来から、低温の液化ガスを収容するための多重殻タンクが知られている。多重殻タンクは、内槽と、内槽を囲繞する外槽とを備える。多重殻タンクには、内槽が支持スカートと称される筒状の支持部材で支持されたものがある。特許文献１は、この種の多重殻タンクを開示する。 Conventionally, multi-shell tanks for storing low-temperature liquefied gas have been known. The multi-shell tank includes an inner tank and an outer tank surrounding the inner tank. Some multi-shell tanks have an inner tank supported by a cylindrical support member called a support skirt. Patent Document 1 discloses this type of multi-shell tank.
　特許文献１の多重殻タンク（二重殻円筒形低温貯槽）は、内槽と、保冷層を介して内槽を囲繞する外槽とを備え、外槽の底板端部を貫通して内槽に至る円筒形状の支持スカートで内槽及び外槽が基礎上に支持されたものである。外槽は、半球形状の外槽屋根板と、円筒形状の外槽側板と、外槽胴板と、外槽底板とで構成されている。支持スカートの内周にはリング状の底板接続部材が固定されており、この底板接続部材に取り付けられた梁部材の上に外槽底板が配置されている。また、支持スカートの外周にはリング状の胴板接続部材が固定されており、この胴板接続部材に外槽胴板の下端部が接続されている。 The multi-shell tank (double-shell cylindrical low-temperature storage tank) of Patent Document 1 includes an inner tank and an outer tank that surrounds the inner tank via a cold insulation layer, and the inner tank penetrates through the end of the bottom plate of the outer tank. The inner tank and outer tank are supported on the foundation by a cylindrical support skirt that extends to the bottom. The outer tank is composed of a hemispherical outer tank roof plate, a cylindrical outer tank side plate, an outer tank body plate, and an outer tank bottom plate. A ring-shaped bottom plate connection member is fixed to the inner periphery of the support skirt, and an outer tank bottom plate is disposed on a beam member attached to this bottom plate connection member. Further, a ring-shaped body plate connecting member is fixed to the outer periphery of the support skirt, and a lower end portion of the outer tank body plate is connected to this body plate connecting member.
特開２０１０－５４０３３号公報（図４，６）Japanese Patent Application Publication No. 2010-54033 (Figures 4 and 6)
　特許文献１に開示された支持スカートに接続部材を介して外槽板材が接合された外槽支持構造を有する多重殻タンクでは、建造時において支持スカートと接続部材の接合及び接続部材と外槽板材との接合は施工現場で施工されるのが妥当である。特許文献１に開示された外槽支持構造を実現する場合、先ず、支持スカートの外周面に接続部材が溶接され、次に、接続部材と外槽板材とが溶接される。この場合、支持スカートと接続部材との溶接は比較的難易度の高い横向き姿勢で行われる。また、近年では、多重殻タンクは大型化の傾向があり、大型の多重殻タンクでは支持スカートに接合される接続部材も重量物となることから、支持スカートと接続部材との接合作業がより難易度の高いものとなる。 In a multi-shell tank having an outer tank support structure in which an outer tank plate is joined to a support skirt via a connecting member as disclosed in Patent Document 1, the support skirt and the connecting member are joined together and the connecting member and the outer tank plate are joined during construction. It is appropriate that the connection with the material be performed at the construction site. When realizing the outer tank support structure disclosed in Patent Document 1, first, a connecting member is welded to the outer peripheral surface of the support skirt, and then the connecting member and the outer tank plate material are welded. In this case, welding between the support skirt and the connecting member is performed in a horizontal position, which is relatively difficult. In addition, in recent years, multi-shell tanks have tended to become larger, and in large multi-shell tanks, the connecting members that are joined to the support skirt are also heavy, making it more difficult to join the support skirt and the connecting members. It will be of high quality.
　本開示は以上の事情に鑑みてされたものであり、その目的は、支持スカートに接続部材を介して外槽板材が接合された外槽支持構造を有する多重殻タンクであって、現場施工性を改善できるものを提案することにある。 The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a multi-shell tank having an outer tank support structure in which an outer tank board is joined to a support skirt via a connecting member, and which is easy to construct on-site. The goal is to suggest ways to improve the situation.
　上記課題を解決するために、本開示の一態様に係る多重殻タンクは、
内槽と、
前記内槽を囲む外槽と、
前記内槽の外壁から基礎まで上下方向に延びる筒状の内スカートと、
前記内スカートと前記外槽との間に介在して、前記内スカートと前記外槽とを接続する接続部材とを備え、
前記外槽は、外槽上殻と、前記外槽上殻の下方に配置された外槽下殻とを有し、
前記内スカートは、上スカートと、前記上スカートの下に配置された下スカートと有し、
前記接続部材は、前記上スカート及び前記下スカートによって前記上下方向に挟まれた状態で前記上スカート及び前記下スカートと接合された内縁部と、前記外槽上殻の下縁と接合された外縁部とを有する環状板であるものである。 In order to solve the above problems, a multi-shell tank according to one embodiment of the present disclosure comprises:
An inner tank,
An outer tank surrounding the inner tank;
A cylindrical inner skirt extending in a vertical direction from an outer wall of the inner tank to a foundation;
a connecting member interposed between the inner skirt and the outer tub to connect the inner skirt and the outer tub,
The outer shell has an outer shell upper shell and an outer shell lower shell arranged below the outer shell upper shell,
The inner skirt has an upper skirt and a lower skirt disposed below the upper skirt,
The connecting member is an annular plate having an inner edge portion joined to the upper skirt and the lower skirt while being sandwiched between the upper skirt and the lower skirt in the vertical direction, and an outer edge portion joined to the lower edge of the outer shell upper shell.
　本開示によれば、支持スカートに接続部材を介して外槽板材が接合された外槽支持構造を有する多重殻タンクであって、現場施工性を改善できるものを提案できる。 According to the present disclosure, it is possible to propose a multi-shell tank having an outer tank support structure in which an outer tank plate is joined to a support skirt via a connecting member, and which can improve field workability.
図１は、本開示の第１実施形態に係る多重殻タンクの垂直断面図である。FIG. 1 is a vertical cross-sectional view of a multi-shell tank according to a first embodiment of the present disclosure. 図２は、第１実施形態に係る多重殻タンクの外槽と支持スカートの接続部の拡大垂直断面図である。FIG. 2 is an enlarged vertical cross-sectional view of the connection between the outer shell and the support skirt of the multi-shell tank according to the first embodiment. 図３は、第１実施形態の変形例１に係る多重殻タンクの外槽と支持スカートの接続部の拡大垂直断面図である。FIG. 3 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the support skirt of the multi-shell tank according to Modification 1 of the first embodiment. 図４は、第１実施形態の変形例１に係る多重殻タンクの外槽と支持スカートの接続部の拡大垂直断面図である。FIG. 4 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the support skirt of the multi-shell tank according to Modification 1 of the first embodiment. 図５は、本開示の第２実施形態に係る多重殻タンクの垂直断面図である。FIG. 5 is a vertical cross-sectional view of a multi-shell tank according to a second embodiment of the present disclosure. 図６は、第２実施形態に係る多重殻タンクの外槽及び内槽と支持スカートの接続部の拡大垂直断面図である。FIG. 6 is an enlarged vertical cross-sectional view of the connection portion between the outer tank and the inner tank and the support skirt of the multi-shell tank according to the second embodiment. 図７は、第２実施形態の変形例に係る多重殻タンクの外槽及び内槽と支持スカートの接続部の拡大垂直断面図である。FIG. 7 is an enlarged vertical cross-sectional view of a connecting portion between the outer tank, the inner tank, and the support skirt of a multi-shell tank according to a modification of the second embodiment.
〔第１実施形態〕
　次に、図面を参照して本開示の実施の形態を説明する。図１は、本開示の第１実施形態に係る多重殻タンク１の垂直断面図である。図１に示す多重殻タンク１は、液化水素や液化天然ガス等の低温の液化ガスを貯蔵する低温容器である。多重殻タンク１は、支持スカート２を介して基礎１０に支持される。基礎１０は、例えば、液化ガス運搬船の船体、バージや浮体貯蔵設備などの浮体構造物の構造体、地上に設置されたコンクリート製基台などであってよい。 First Embodiment
Next, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a vertical cross-sectional view of a multi-shell tank 1 according to a first embodiment of the present disclosure. The multi-shell tank 1 shown in Fig. 1 is a cryogenic container for storing low-temperature liquefied gas such as liquefied hydrogen or liquefied natural gas. The multi-shell tank 1 is supported on a foundation 10 via a support skirt 2. The foundation 10 may be, for example, the hull of a liquefied gas carrier, the structure of a floating structure such as a barge or floating storage facility, or a concrete base installed on the ground.
　多重殻タンク１は球形タンクである。但し、多重殻タンク１は、球形タンクに限定されず、扁長楕円体状の変形球形タンクや、頂部と底部の間に筒部を有するストレッチタンクや、直方体状の方形タンクであってもよい。多重殻タンク１は、液化ガスを収容する内槽３と、内槽３を囲繞する外槽４とを備える。内槽３と外槽４とは径方向に隔てられており、内槽３と外槽４の間の内外槽間は断熱層となっている。内外槽間には断熱材が充填されてもよいし、内外槽間は真空断熱層であってもよい。なお、本実施形態に係る多重殻タンク１は内槽３と外槽４を備える二重殻タンクであるが、３以上の多重の槽を備える多重殻タンク１にも本開示を適用可能である。 The multi-shell tank 1 is a spherical tank. However, the multi-shell tank 1 is not limited to a spherical tank, and may be a deformed spherical tank in the shape of a prolate ellipsoid, a stretch tank having a cylindrical portion between the top and bottom, or a rectangular tank in the shape of a rectangular parallelepiped. The multi-shell tank 1 includes an inner tank 3 that contains liquefied gas, and an outer tank 4 that surrounds the inner tank 3. The inner tank 3 and the outer tank 4 are radially separated, and an insulating layer is formed between the inner tank 3 and the outer tank 4. An insulating material may be filled between the inner and outer tanks, or a vacuum insulating layer may be formed between the inner and outer tanks. Note that the multi-shell tank 1 according to this embodiment is a double-shell tank that includes an inner tank 3 and an outer tank 4, but the present disclosure is also applicable to a multi-shell tank 1 that includes three or more tanks.
　外槽４は、外槽上殻４１と外槽下殻４２からなる。例えば外槽４が球殻である場合には、外槽４の外形の球を赤道と下の極との間に配置された水平切断面で切断して上部分と下部分に分けたときの、上部分（即ち、球欠部分）が外槽上殻４１に相当し、下部分（即ち、球冠部分）が外槽下殻４２に相当する。 The outer tank 4 consists of an outer tank upper shell 41 and an outer tank lower shell 42. For example, when the outer tank 4 is a spherical shell, when the outer shape of the outer tank 4 is cut along a horizontal cutting plane placed between the equator and the lower pole and divided into an upper part and a lower part, , the upper part (i.e., the bulbous part) corresponds to the outer tank upper shell 41, and the lower part (i.e., the bulbous crown part) corresponds to the outer tank lower shell 42.
　支持スカート２は、全体として、内槽３の外壁から基礎１０まで上下方向に延びる筒状を呈する。支持スカート２によって、外槽４は外槽上殻４１と外槽下殻４２に分断されている。支持スカート２は、上スカート２２と下スカート２１からなる。上スカート２２と下スカート２１は実質的に同一径であって同心状に配置された筒体である。上スカート２２の上端は内槽３の赤道周辺の外壁と接合されている。上スカート２２の下端２２１は接続部材５を介して下スカート２１の上端２１１と接続されている。下スカート２１の下端は基礎１０と接合され、下スカート２１は基礎１０に立設されている。 The support skirt 2 has a cylindrical shape extending vertically from the outer wall of the inner tank 3 to the foundation 10 as a whole. The support skirt 2 divides the outer tank 4 into an outer tank upper shell 41 and an outer tank lower shell 42. The support skirt 2 consists of an upper skirt 22 and a lower skirt 21. The upper skirt 22 and the lower skirt 21 are cylindrical bodies of substantially the same diameter and arranged concentrically. The upper end of the upper skirt 22 is joined to the outer wall around the equator of the inner tank 3. The lower end 221 of the upper skirt 22 is connected to the upper end 211 of the lower skirt 21 via a connecting member 5. The lower end of the lower skirt 21 is joined to the foundation 10, and the lower skirt 21 is erected on the foundation 10.
　外槽下殻４２の上縁は下スカート２１の内壁に接合されており、外槽下殻４２は下スカート２１に支持されている。外槽上殻４１の下縁４１１は、接続部材５を介して支持スカート２と接続されている。このように、支持スカート２における外槽上殻４１の接続部と外槽下殻４２の接続部とは上下方向に離れている。 The upper edge of the outer tank lower shell 42 is joined to the inner wall of the lower skirt 21, and the outer tank lower shell 42 is supported by the lower skirt 21. A lower edge 411 of the outer tank upper shell 41 is connected to the support skirt 2 via the connecting member 5. In this way, the connecting portion of the outer tank upper shell 41 and the connecting portion of the outer tank lower shell 42 in the support skirt 2 are separated from each other in the vertical direction.
　ここで、外槽４と支持スカート２との接続構造について詳細に説明する。図２は、第１実施形態に係る多重殻タンク１の外槽４と支持スカート２の接続部の拡大垂直断面図である。図２に示すように、外槽上殻４１の下縁４１１と支持スカート２は接続部材５によって接続されている。 Here, the connection structure between the outer tank 4 and the support skirt 2 will be explained in detail. FIG. 2 is an enlarged vertical sectional view of the connecting portion between the outer tank 4 and the support skirt 2 of the multi-shell tank 1 according to the first embodiment. As shown in FIG. 2, the lower edge 411 of the outer tank upper shell 41 and the support skirt 2 are connected by a connecting member 5.
　本実施形態に係る接続部材５は、上下方向と略直交する面を有する環状板５０である。環状板５０の外径は外槽上殻４１の外径と実質的に同じである。また、環状板５０の内径は、支持スカート２の外径と実質的に同一である。環状板５０の内縁部５０ａが支持スカート２との接合部であり、環状板５０の外縁部５０ｂが外槽上殻４１との接合部である。 The connecting member 5 according to the present embodiment is an annular plate 50 having a surface substantially perpendicular to the vertical direction. The outer diameter of the annular plate 50 is substantially the same as the outer diameter of the outer tank upper shell 41. Further, the inner diameter of the annular plate 50 is substantially the same as the outer diameter of the support skirt 2. An inner edge 50a of the annular plate 50 is a joint with the support skirt 2, and an outer edge 50b of the annular plate 50 is a joint with the outer tank upper shell 41.
　環状板５０の内縁部５０ａの上面は上スカート２２の下端２２１と接合されている。環状板５０の内縁部５０ａの下面は下スカート２１の上端２１１と接合されている。つまり、環状板５０の内縁部５０ａは、下スカート２１と上スカート２２によって上下方向に挟み込まれた状態で、下スカート２１及び上スカート２２に固定されている。 The upper surface of the inner edge 50a of the annular plate 50 is joined to the lower end 221 of the upper skirt 22. The lower surface of the inner edge 50a of the annular plate 50 is joined to the upper end 211 of the lower skirt 21. That is, the inner edge portion 50a of the annular plate 50 is fixed to the lower skirt 21 and the upper skirt 22 while being sandwiched between the lower skirt 21 and the upper skirt 22 in the vertical direction.
　下スカート２１及び上スカート２２と環状板５０とを接合する際には、先ず、下スカート２１の構成要素を上下反転させ、この構成要素を環状板５０の上に載せた状態で当該構成要素と環状板５０の内縁部５０ａが溶接される。次に、下スカート２１の構成要素と環状板５０の接合体の上下反転を戻して、環状板５０に上スカート２２の構成要素を載せた状態で上スカート２２の構成要素と環状板５０が溶接される。この場合、現場で行われる溶接作業を安定した溶接対象に対し下向き姿勢で行うことができるので、作業の難易度が下がり現場施工性が向上する。 When joining the lower skirt 21 and the upper skirt 22 to the annular plate 50, first, turn the constituent elements of the lower skirt 21 upside down and place them on the annular plate 50. The inner edge 50a of the annular plate 50 is welded. Next, the vertical inversion of the joined body of the components of the lower skirt 21 and the annular plate 50 is reversed, and the components of the upper skirt 22 and the annular plate 50 are welded with the components of the upper skirt 22 placed on the annular plate 50. be done. In this case, welding work performed on-site can be performed on a stable welding target in a downward position, which reduces the difficulty of the work and improves on-site workability.
　環状板５０の外縁部５０ｂの上面と外槽上殻４１の下縁４１１とが接合されている。外槽上殻４１と環状板５０の接合は、下スカート２１と環状板５０の接合を終えた後で行われるとよい。外槽上殻４１と環状板５０を接合する際には、作業員は環状板５０の上を足場として作業を行う。前述の支持スカート２と環状板５０との接合構造によれば、環状板５０は作業員及び作業機械を支持可能であって作業員が作業を行うための足場として十分に機能する。更に、作業員が接続部材５を足場とすれば、接続部材５と外槽上殻４１の溶接を下向き姿勢で行うことができるので、作業の難易度が下がり現場施工性が向上する。 The upper surface of the outer edge 50b of the annular plate 50 and the lower edge 411 of the outer tank upper shell 41 are joined. The outer tank upper shell 41 and the annular plate 50 are preferably joined after the lower skirt 21 and the annular plate 50 are joined. When joining the outer tank upper shell 41 and the annular plate 50, a worker performs the work using the annular plate 50 as a foothold. According to the above-described joint structure between the support skirt 2 and the annular plate 50, the annular plate 50 can support a worker and a working machine, and fully functions as a scaffold for the worker to perform work. Furthermore, if the worker uses the connecting member 5 as a foothold, the connecting member 5 and the outer tank upper shell 41 can be welded in a downward position, which reduces the difficulty of the work and improves workability on site.
　上記実施形態において接続部材５である環状板５０は、上下方向と略直交する面（即ち、水平面）を有するが、環状板５０は水平面から若干の傾きを有していてもよい。この場合、環状板５０の外縁部５０ｂが内縁部５０ａよりも高い姿勢で、環状板５０が支持スカート２の下スカート２１及び上スカート２２、並びに、外槽上殻４１と接合されている。このように環状板５０が水平から傾きを有していても、当該傾きが下スカート２１に環状板５０を載せることができる範囲であれば、接合作業の施工性において前述と同様の作用効果が得られる。 In the above embodiment, the annular plate 50 that is the connecting member 5 has a surface (that is, a horizontal surface) that is substantially orthogonal to the vertical direction, but the annular plate 50 may have a slight inclination from the horizontal surface. In this case, the annular plate 50 is joined to the lower skirt 21 and the upper skirt 22 of the support skirt 2, and the outer tank upper shell 41, with the outer edge 50b of the annular plate 50 being higher than the inner edge 50a. Even if the annular plate 50 has an inclination from the horizontal in this way, as long as the inclination is within a range that allows the annular plate 50 to be placed on the lower skirt 21, the same effect as described above can be obtained in terms of workability of the joining work. can get.
　続いて、第１実施形態に係る多重殻タンク１の変形例を説明する。なお、変形例の説明においては、前述の実施形態と同一又は類似の部材には図面に同一の符号を付し、説明を省略する。 Next, a modification of the multi-shell tank 1 according to the first embodiment will be described. In addition, in the description of the modification, the same reference numerals are given to the same or similar members as in the above-described embodiment in the drawings, and the description thereof will be omitted.
〔変形例１〕
　内槽３に低温の液化ガスが収容されると、内槽３と外槽４との熱収縮の差によって、外槽上殻４１の下縁４１１と、支持スカート２の下スカート２１の上端２１１（又は、上スカート２２の下端２２１）との間に相対的な変位が生じる。そこで、変形例１に係る多重殻タンク１では、このような相対的な変位に起因して接続部材５に発生する応力が低減されるように、接続部材５である環状板５０Ｂが、積極的に弾性変形を許容し得る構造を備える。 [Modification 1]
When low-temperature liquefied gas is stored in the inner tank 3, due to the difference in thermal contraction between the inner tank 3 and the outer tank 4, the lower edge 411 of the outer tank upper shell 41 and the upper end 211 of the lower skirt 21 of the support skirt 2 (or the lower end 221 of the upper skirt 22). Therefore, in the multi-shell tank 1 according to the first modification, the annular plate 50B, which is the connecting member 5, is actively It has a structure that allows for elastic deformation.
　図３は、第１実施形態の変形例１に係る多重殻タンク１の外槽４と支持スカート２の接続部の拡大垂直断面図である。図３に示すように、変形例１に係る多重殻タンク１の接続部材５は、外リング部５１、外リング部５１から上又は下に離れて配置された内リング部５３、及び、外リング部５１と内リング部５３を上下方向に接続する筒部５２を有する環状板５０Ｂである。外リング部５１の外縁部分が外槽上殻４１と接合される外縁部５０ｂである。内リング部５３の内縁部分が支持スカート２と接合される内縁部５０ａである。外リング部５１の主面と筒部５２の端面が接合され、筒部５２の端面と内リング部５３の主面とが接合される。図３に示す例では、外リング部５１は内リング部５３の上方に配置されており、外リング部５１の内縁の下面と筒部５２の上端とが接合されており、筒部５２の下端と内リング部５３の外縁の上面とが接合されている。外リング部５１が内リング部５３の下方に配置されている場合には、外リング部５１の内縁の上面と筒部５２の下端とが接合され、筒部５２の上端と内リング部５３の外縁の下面とが接合される。 FIG. 3 is an enlarged vertical cross-sectional view of the connection portion between the outer tank 4 and the support skirt 2 of the multi-shell tank 1 according to Modification 1 of the first embodiment. As shown in FIG. 3, the connection member 5 of the multi-shell tank 1 according to the first modification includes an outer ring part 51, an inner ring part 53 disposed upwardly or downwardly away from the outer ring part 51, and an outer ring. It is an annular plate 50B having a cylindrical portion 52 that connects the portion 51 and the inner ring portion 53 in the vertical direction. An outer edge portion of the outer ring portion 51 is an outer edge portion 50b that is joined to the outer tank upper shell 41. An inner edge portion of the inner ring portion 53 is an inner edge portion 50a that is joined to the support skirt 2. The main surface of the outer ring section 51 and the end surface of the cylindrical section 52 are joined, and the end surface of the cylindrical section 52 and the main surface of the inner ring section 53 are joined. In the example shown in FIG. 3, the outer ring part 51 is arranged above the inner ring part 53, the lower surface of the inner edge of the outer ring part 51 and the upper end of the cylindrical part 52 are joined, and the lower end of the cylindrical part 52 and the upper surface of the outer edge of the inner ring portion 53 are joined. When the outer ring portion 51 is disposed below the inner ring portion 53, the upper surface of the inner edge of the outer ring portion 51 and the lower end of the cylindrical portion 52 are joined, and the upper end of the cylindrical portion 52 and the lower end of the inner ring portion 53 are joined. The lower surface of the outer edge is joined.
　上記構成の環状板５０Ｂによれば、支持スカート２が接合される内縁部５０ａに対し外槽４が接合される外縁部５０ｂが相対的に変位した場合に、環状板５０Ｂ（そのうち、特に外リング部５１及び内リング部５３）が弾性変形することによって、内縁部５０ａに対する外縁部５０ｂの相対的な変位が積極的に許容される。よって、外槽上殻４１の下縁４１１と、支持スカート２の下スカート２１の上端２１１（又は、上スカート２２の下端２２１）との間に相対的な変位が生じた場合に、外槽上殻４１と環状板５０Ｂ、環状板５０Ｂと支持スカート２との接合部分に作用する応力が低減される。 According to the annular plate 50B having the above configuration, when the outer edge 50b to which the outer tank 4 is joined is displaced relative to the inner edge 50a to which the support skirt 2 is joined, the annular plate 50B (particularly the outer ring By elastically deforming the portion 51 and the inner ring portion 53), relative displacement of the outer edge portion 50b with respect to the inner edge portion 50a is actively permitted. Therefore, when a relative displacement occurs between the lower edge 411 of the outer tank upper shell 41 and the upper end 211 of the lower skirt 21 of the support skirt 2 (or the lower end 221 of the upper skirt 22), the outer tank upper The stress acting on the joints between the shell 41 and the annular plate 50B and between the annular plate 50B and the support skirt 2 is reduced.
　なお、変位吸収機能を有する接続部材５は、図３に示す環状板５０Ｂに限定されず、例えば、図４に示すように径方向中央部に周方向に連続する突条５８やベローズが設けられた環状板５０Ｃであってもよい。 Note that the connection member 5 having a displacement absorption function is not limited to the annular plate 50B shown in FIG. 3, but may include, for example, a protrusion 58 or a bellows continuous in the circumferential direction in the radial center portion as shown in FIG. Alternatively, the annular plate 50C may be used.
〔第２実施形態〕
　次に、第２実施形態を説明する。本実施形態の説明においては、前述の第１実施形態と同一又は類似の部材には図面に同一の符号を付し、説明を省略する。 [Second embodiment]
Next, a second embodiment will be described. In the description of this embodiment, members that are the same or similar to those of the first embodiment described above will be denoted by the same reference numerals in the drawings, and the description will be omitted.
　図５は、本開示の第２実施形態に係る多重殻タンク１Ｂの垂直断面図である。第２実施形態に係る多重殻タンク１Ｂは、外槽４を支持する外スカート６を更に備える点で、第１実施形態に係る多重殻タンク１と相違する。ここでは、第１実施形態の多重殻タンク１が備える支持スカート２を、外スカート６と区別するために「内スカート２」と称する。 FIG. 5 is a vertical cross-sectional view of a multi-shell tank 1B according to a second embodiment of the present disclosure. The multi-shell tank 1B according to the second embodiment differs from the multi-shell tank 1 according to the first embodiment in that it further includes an outer skirt 6 that supports the outer tank 4. Here, the support skirt 2 included in the multi-shell tank 1 of the first embodiment is referred to as the "inner skirt 2" to distinguish it from the outer skirt 6.
　図５に示すように、内スカート２の外周側に外スカート６が配置されている。外スカート６は、内スカート２と同心状に配置され、内スカート２よりも大径の筒状体である。外スカート６の下端６２は基礎１０と接合され、外スカート６は基礎１０に立設されている。外スカート６の下端６２は、外槽４の外槽上殻４１の下縁４１１と接続されている。 As shown in FIG. 5, an outer skirt 6 is arranged on the outer peripheral side of the inner skirt 2. The outer skirt 6 is arranged concentrically with the inner skirt 2 and is a cylindrical body having a larger diameter than the inner skirt 2. The lower end 62 of the outer skirt 6 is joined to the foundation 10, and the outer skirt 6 is erected on the foundation 10. A lower end 62 of the outer skirt 6 is connected to a lower edge 411 of the outer tank upper shell 41 of the outer tank 4.
　第２実施形態に係る多重殻タンク１Ｂの外槽４の外槽上殻４１は、第１実施形態のような球欠形状ではなく、半球殻部４１２と、半球殻部４１２の下端に連続する筒胴部４１３から成る。半球殻部４１２と筒胴部４１３の外径は実質的に同一であり、半球殻部４１２と筒胴部４１３は上下方向に滑らかに接続されている。筒胴部４１３の下端が、即ち、外槽上殻４１の下縁４１１である。外スカート６の外径と、外槽４の筒胴部４１３の外径は実質的に同一であり、これらは同心状に配置される。よって、外スカート６の上に外槽４の筒胴部４１３が載せられた態様となる。 The outer tank upper shell 41 of the outer tank 4 of the multi-shell tank 1B according to the second embodiment does not have a rounded shape like the first embodiment, but is continuous with the hemispherical shell part 412 and the lower end of the hemispherical shell part 412. It consists of a cylinder body part 413. The outer diameters of the hemispherical shell part 412 and the cylinder body part 413 are substantially the same, and the hemispherical shell part 412 and the cylinder body part 413 are smoothly connected in the vertical direction. The lower end of the barrel portion 413 is the lower edge 411 of the outer tank upper shell 41. The outer diameter of the outer skirt 6 and the outer diameter of the barrel portion 413 of the outer tank 4 are substantially the same, and these are arranged concentrically. Therefore, the cylinder body 413 of the outer tank 4 is placed on the outer skirt 6.
　図６は、第２実施形態に係る多重殻タンク１Ｂの外槽４及び内槽３と支持スカート２の接続部の拡大垂直断面図である。図６に示すように、本実施形態に係る多重殻タンク１Ｂの接続部材５は、第１実施形態に係る多重殻タンク１と同様に環状板５０であってよい。内スカート２は、下スカート２１と、上スカート２２と、下スカート２１と上スカート２２の間を接続する接続リング２３により構成されている。環状板５０の内縁部５０ａは、内スカート２の上スカート２２と接続リング２３とにより上下から挟み込まれた態様で、下面が接続リング２３と接合され、上面が上スカート２２と接合されている。接続リング２３には、外槽下殻４２が接続されている。また、環状板５０の外縁部５０ｂは、外槽上殻４１と外スカート６とにより上下から挟み込まれた態様で、上面が外槽上殻４１の下縁４１１と接合され、下面が外スカート６の上端６１と接合されている。このように、環状板５０は、内スカート２を略水平方向に貫いているとともに、外槽４の外槽上殻４１と外スカート６との間を略水平方向に貫いている。 FIG. 6 is an enlarged vertical sectional view of the connection portion between the outer tank 4 and the inner tank 3 and the support skirt 2 of the multi-shell tank 1B according to the second embodiment. As shown in FIG. 6, the connection member 5 of the multi-shell tank 1B according to the present embodiment may be an annular plate 50 similarly to the multi-shell tank 1 according to the first embodiment. The inner skirt 2 includes a lower skirt 21, an upper skirt 22, and a connecting ring 23 that connects the lower skirt 21 and the upper skirt 22. The inner edge 50a of the annular plate 50 is sandwiched between the upper skirt 22 of the inner skirt 2 and the connecting ring 23 from above and below, and has a lower surface joined to the connecting ring 23 and an upper surface joined to the upper skirt 22. An outer tank lower shell 42 is connected to the connection ring 23 . Further, the outer edge portion 50b of the annular plate 50 is sandwiched between the outer tank upper shell 41 and the outer skirt 6 from above and below, and the upper surface is joined to the lower edge 411 of the outer tank upper shell 41, and the lower surface is connected to the outer skirt 6. It is joined to the upper end 61 of. In this way, the annular plate 50 penetrates the inner skirt 2 in a substantially horizontal direction, and also penetrates in a substantially horizontal direction between the outer tank upper shell 41 of the outer tank 4 and the outer skirt 6.
　第２実施形態に係る多重殻タンク１Ｂでは、外槽下殻４２及び内槽３は内スカート２によって支持され、外槽上殻４１は外スカート６によって支持される。このように多重殻タンク１Ｂの接続部材５は内槽３と外槽４の荷重を負担せずに、接続部材５は主に内槽３と外槽上殻４１の内外槽間を気密に塞ぐ役割を担う。 In the multi-shell tank 1B according to the second embodiment, the outer tank lower shell 42 and the inner tank 3 are supported by the inner skirt 2, and the outer tank upper shell 41 is supported by the outer skirt 6. In this way, the connecting member 5 of the multi-shell tank 1B does not bear the load of the inner tank 3 and the outer tank 4, and the connecting member 5 mainly airtightly closes the space between the inner and outer tanks of the inner tank 3 and the outer tank upper shell 41. play a role.
　第２実施形態に係る多重殻タンク１Ｂにおいても、内スカート２の下スカート２１の構成要素と外スカート６の構成要素を上下反転させ、これらの構成要素を環状板５０の上に載せた状態で、下スカート２１の構成要素と環状板５０との溶接と、外スカート６の構成要素と環状板５０との溶接を行うことが好ましい。これにより、これらの溶接作業を安定して行うことができる。更に、下スカート２１の構成要素及び外スカート６の構成要素が接合された環状板５０の上に上スカート２２と外槽上殻４１を載せた状態で、上スカート２２と環状板５０との溶接と、外槽上殻４１と環状板５０との溶接が行われる。上スカート２２と環状板５０の溶接作業、及び、外槽上殻４１と環状板５０の溶接作業の際には、作業者は環状板５０の上を足場として利用できる。 In the multi-shell tank 1B according to the second embodiment, the components of the lower skirt 21 of the inner skirt 2 and the components of the outer skirt 6 are turned upside down, and these components are placed on the annular plate 50. It is preferable to weld the components of the lower skirt 21 and the annular plate 50 and the components of the outer skirt 6 and the annular plate 50. Thereby, these welding operations can be performed stably. Further, with the upper skirt 22 and the outer tank upper shell 41 placed on the annular plate 50 to which the constituent elements of the lower skirt 21 and the outer skirt 6 are joined, the upper skirt 22 and the annular plate 50 are welded together. Then, the outer tank upper shell 41 and the annular plate 50 are welded. During the welding work between the upper skirt 22 and the annular plate 50 and the welding work between the outer tank upper shell 41 and the annular plate 50, the operator can use the top of the annular plate 50 as a foothold.
　なお、第２実施形態に係る多重殻タンク１Ｂにおいても、第１実施形態の変形例で説明した接続部材５を採用可能である。例えば、図７に示すように、第２実施形態に係る多重殻タンク１Ｂにおいて、内スカート２と外槽上殻４１及び外スカート６とを接続する接続部材５が、上下方向の弾性変形を許容し得る環状板５０Ｂであってもよい。 Note that the connection member 5 described in the modification of the first embodiment can also be employed in the multi-shell tank 1B according to the second embodiment. For example, as shown in FIG. 7, in the multi-shell tank 1B according to the second embodiment, the connecting member 5 that connects the inner skirt 2, the outer tank upper shell 41, and the outer skirt 6 allows elastic deformation in the vertical direction. An annular plate 50B may be used.
〔総括〕
　本開示の第１の項目に係る多重殻タンク１，１Ｂは、
内槽３と、
内槽３を囲む外槽４と、
内槽３の外壁から基礎１０まで上下方向に延びる筒状の内スカート２と、
内スカート２と外槽４の間に介在して、内スカート２と外槽４とを接続する接続部材５とを備える。
外槽４は、外槽上殻４１と、外槽上殻４１の下方に配置された外槽下殻４２とを有し、
内スカート２は、上スカート２２と、上スカート２２の下方に配置された下スカート２１とを有し、
接続部材５は、上スカート２２及び下スカート２１によって上下方向に挟まれた状態で上スカート２２及び下スカート２１と接合された内縁部５０ａと、外槽上殻４１の下縁４１１と接合された外縁部５０ｂとを有する環状板５０である。 [Summary]
The multi-shell tank 1, 1B according to the first aspect of the present disclosure is
An inner tank 3;
An outer tank 4 surrounding the inner tank 3;
A cylindrical inner skirt 2 extending vertically from the outer wall of the inner tank 3 to the foundation 10;
A connecting member 5 is provided between the inner skirt 2 and the outer tub 4 to connect the inner skirt 2 and the outer tub 4.
The outer tub 4 has an outer tub upper shell 41 and an outer tub lower shell 42 arranged below the outer tub upper shell 41.
The inner skirt 2 has an upper skirt 22 and a lower skirt 21 arranged below the upper skirt 22,
The connecting member 5 is an annular plate 50 having an inner edge portion 50a joined to the upper skirt 22 and the lower skirt 21 while being sandwiched vertically between the upper skirt 22 and the lower skirt 21, and an outer edge portion 50b joined to the lower edge 411 of the outer tank upper shell 41.
　上記構成の多重殻タンク１，１Ｂでは、下スカート２１と接続部材５の接続に際し、上下反転させた下スカート２１の構成要素を接続部材５の上に載せてこれらを溶接することができる。また、上スカート２２と接続部材５の接続に際し、接続部材５に上スカート２２を載せてこれらを溶接することができる。このように、現場で行われる溶接作業を安定した溶接対象に対し下向き姿勢で行うことができるので、作業の難易度が下がり現場施工性が向上する。また、上記のように内スカート２に接合された接続部材５は、接続部材５と外槽上殻４１を溶接する際の足場となり得る。接続部材５として略水平な面を有する環状板５０が用いられることで、環状板５０上での作業員の姿勢が安定し、また、自動溶接機の走行やジャッキによる位置合わせ作業が可能となり、溶接の品質向上や工作精度の向上が見込まれる。更に、作業員が接続部材５を足場とすれば、接続部材５と外槽上殻４１の溶接を下向き姿勢で行うことができるので、作業の難易度が下がり現場施工性が向上する。 In the multi-shell tanks 1 and 1B having the above configuration, when connecting the lower skirt 21 and the connecting member 5, the components of the lower skirt 21 that are upside down can be placed on the connecting member 5 and welded together. Further, when connecting the upper skirt 22 and the connecting member 5, the upper skirt 22 can be placed on the connecting member 5 and welded together. In this way, welding work performed on-site can be performed on a stable welding target in a downward position, which reduces the difficulty of the work and improves on-site workability. Further, the connecting member 5 joined to the inner skirt 2 as described above can serve as a foothold when welding the connecting member 5 and the outer tank upper shell 41. By using the annular plate 50 having a substantially horizontal surface as the connecting member 5, the posture of the worker on the annular plate 50 is stabilized, and it becomes possible to run an automatic welding machine and perform positioning work using a jack. It is expected to improve welding quality and work precision. Furthermore, if the worker uses the connecting member 5 as a foothold, the connecting member 5 and the outer tank upper shell 41 can be welded in a downward position, which reduces the difficulty of the work and improves workability on site.
　本開示の第２の項目に係る多重殻タンク１Ｂは、第１の項目に係る多重殻タンク１，１Ｂにおいて、
内スカート２の外側に配置され、外槽上殻４１の下縁４１１から基礎１０まで上下方向に延びる筒状の外スカート６を、更に備え、
環状板５０の外縁部５０ｂは外槽上殻４１及び外スカート６によって上下方向に挟まれた状態で外槽上殻４１及び外スカート６と接合されている。 The multi-shell tank 1B according to the second item of the present disclosure has the following features in the multi-shell tank 1, 1B according to the first item:
Further comprising a cylindrical outer skirt 6 disposed outside the inner skirt 2 and extending vertically from the lower edge 411 of the outer tank upper shell 41 to the foundation 10,
The outer edge portion 50b of the annular plate 50 is joined to the outer tank upper shell 41 and the outer skirt 6 while being sandwiched between the outer tank upper shell 41 and the outer skirt 6 in the vertical direction.
　このように多重殻タンク１Ｂが外スカート６を備える場合であっても、外スカート６と環状板５０との接合に際し、上下反転させた外スカート６の構成要素に環状板５０を載せてこれらを溶接することができる。また、外槽上殻４１と接続部材５の接続に際し、接続部材５に外槽上殻４１を載せてこれらを溶接することができる。このように、現場で行われる溶接作業を安定した溶接対象に対し下向き姿勢で行うことができるので、作業の難易度が下がり現場施工性が向上する。 Even when the multi-shell tank 1B is provided with the outer skirt 6 in this way, when the outer skirt 6 and the annular plate 50 are joined, the annular plate 50 is placed on the component of the outer skirt 6 which is turned upside down, and these are connected. Can be welded. Further, when connecting the outer tank upper shell 41 and the connecting member 5, the outer tank upper shell 41 can be placed on the connecting member 5 and welded together. In this way, welding work performed on-site can be performed on a stable welding target in a downward position, which reduces the difficulty of the work and improves on-site workability.
　本開示の第３の項目に係る多重殻タンク１Ｂは、第２の項目に係る多重殻タンク１Ｂにおいて
外槽上殻４１は、半球殻部４１２と、半球殻部４１２の下に接続された筒胴部４１３とを有し、
筒胴部４１３と外スカート６の外径は実質的に同一であって、筒胴部４１３の下端と外スカート６が接続部材５を間に挟んで接続されているものである。 The multi-shell tank 1B according to the third aspect of the present disclosure is the multi-shell tank 1B according to the second aspect, wherein the outer tank upper shell 41 has a hemispherical shell portion 412 and a cylindrical body portion 413 connected below the hemispherical shell portion 412.
The outer diameters of the cylindrical body portion 413 and the outer skirt 6 are substantially the same, and the lower end of the cylindrical body portion 413 and the outer skirt 6 are connected with the connecting member 5 sandwiched therebetween.
　このように外スカート６と外槽上殻４１の筒胴部４１３とが上下方向に連続する筒体の体をなすことによって、外スカート６によって外槽上殻４１が安定して支持される。 In this way, the outer skirt 6 and the barrel portion 413 of the outer tank upper shell 41 form a vertically continuous cylindrical body, so that the outer tank upper shell 41 is stably supported by the outer skirt 6.
　本開示の第４の項目に係る多重殻タンク１，１Ｂは、第１乃至３のいずれかの項目に係る多重殻タンク１，１Ｂにおいて、接続部材５が、弾性変形することにより内縁部５０ａに対する外縁部５０ｂの相対的な変位を許容する変形許容部を有するものである。 The multi-shell tank 1, 1B according to the fourth item of the present disclosure is a multi-shell tank 1, 1B according to any one of the first to third items, in which the connecting member 5 has a deformation-permitting portion that allows the outer edge portion 50b to be displaced relative to the inner edge portion 50a by elastic deformation.
　このように接続部材５が被接続部同士の相対的な変位を許容することで、接続部材５と被接続部とに発生する応力を低減できる。 By allowing the connecting member 5 to allow relative displacement between the connected parts in this way, stress generated in the connecting member 5 and the connected parts can be reduced.
　本開示の第４の項目に係る多重殻タンク１，１Ｂは、第１乃至４のいずれかの項目に係る多重殻タンク１，１Ｂにおいて、接続部材５は、内縁部５０ａを含む内リング部５３と、内リング部５３から上下方向に離れて配置され且つ外縁部５０ｂを含む外リング部５１と、内リング部５３と外リング部５１に挟まれた態様で内リング部５３と外リング部５１とを上下方向に接続する筒部５２とを有するものである。 The multi-shell tank 1, 1B according to the fourth item of the present disclosure is a multi-shell tank 1, 1B according to any one of the first to fourth items, in which the connecting member 5 has an inner ring portion 53 including an inner edge portion 50a, an outer ring portion 51 that is positioned vertically away from the inner ring portion 53 and includes an outer edge portion 50b, and a tubular portion 52 that vertically connects the inner ring portion 53 and the outer ring portion 51 while being sandwiched between the inner ring portion 53 and the outer ring portion 51.
　このように接続部材５が被接続部同士の相対的な変位を許容する形状を有することで、接続部材５と被接続部とに発生する応力を低減できる。 Since the connecting member 5 has a shape that allows relative displacement between the connected parts, stress generated in the connecting member 5 and the connected parts can be reduced.
　以上の本開示の議論は、例示及び説明の目的で提示されたものであり、本開示を本明細書に開示される形態に限定することを意図するものではない。例えば、前述の詳細な説明では、本開示の様々な特徴は、本開示を合理化する目的で幾つかの実施形態に纏められているが、複数の特徴のうち幾つかが組み合わされてもよい。また、本開示に含まれる複数の特徴は、上記で論じたもの以外の代替の実施形態、構成、又は態様に組み合わされてもよい。 The above discussion of the disclosure has been presented for purposes of illustration and description, and is not intended to limit the disclosure to the form disclosed herein. For example, although in the foregoing detailed description, various features of the disclosure are grouped together in some embodiments for the purpose of streamlining the disclosure, some of the features may be combined. Additionally, features included in this disclosure may be combined in alternative embodiments, configurations, or aspects other than those discussed above.

Claims (5)

  1. 　内槽と、
    　前記内槽を囲む外槽と、
    　前記内槽の外壁から基礎まで上下方向に延びる筒状の内スカートと、
    　前記内スカートと前記外槽との間に介在して、前記内スカートと前記外槽とを接続する接続部材とを備え、
    　前記外槽は、外槽上殻と、前記外槽上殻の下方に配置された外槽下殻とを有し、
    　前記内スカートは、上スカートと、前記上スカートの下に配置された下スカートと有し、
    　前記接続部材は、前記上スカート及び前記下スカートによって前記上下方向に挟まれた状態で前記上スカート及び前記下スカートと接合された内縁部と、前記外槽上殻の下縁と接合された外縁部とを有する環状板である、
    多重殻タンク。     Inner tank and
    an outer tank surrounding the inner tank;
    a cylindrical inner skirt extending vertically from the outer wall of the inner tank to the foundation;
    a connecting member interposed between the inner skirt and the outer tank and connecting the inner skirt and the outer tank;
    The outer tank has an outer tank upper shell and an outer tank lower shell disposed below the outer tank upper shell,
    The inner skirt has an upper skirt and a lower skirt disposed below the upper skirt,
    The connecting member has an inner edge joined to the upper skirt and the lower skirt while being sandwiched between the upper skirt and the lower skirt in the vertical direction, and an outer edge joined to the lower edge of the outer tank upper shell. an annular plate having a portion;
    Multi-shell tank.
  2. 　前記内スカートの外側に配置され、前記外槽上殻の下縁から前記基礎まで前記上下方向に延びる筒状の外スカートを、更に備え、
    　前記環状板の前記外縁部は前記外槽上殻及び前記外スカートによって前記上下方向に挟まれた状態で前記外槽上殻及び前記外スカートと接合されている、
    請求項１に記載の多重殻タンク。     further comprising a cylindrical outer skirt disposed outside the inner skirt and extending in the vertical direction from the lower edge of the outer tank upper shell to the foundation;
    The outer edge portion of the annular plate is joined to the outer tank upper shell and the outer skirt while being sandwiched between the outer tank upper shell and the outer skirt in the vertical direction;
    A multi-shell tank according to claim 1.
  3. 　前記外槽上殻は、半球殻部と、前記半球殻部の下に接続された筒胴部とを有し、
    　前記筒胴部と前記外スカートの外径は実質的に同一であって、前記筒胴部の下端と前記外スカートが前記接続部材を間に挟んで接続されている、
    請求項２に記載の多重殻タンク。     The outer tank upper shell has a hemispherical shell portion and a cylindrical body portion connected below the hemispherical shell portion,
    The outer diameters of the cylinder body and the outer skirt are substantially the same, and the lower end of the cylinder body and the outer skirt are connected with the connecting member in between.
    A multi-shell tank according to claim 2.
  4. 　前記接続部材が、弾性変形することにより前記内縁部に対する前記外縁部の相対的な変位を許容する変形許容部を有する、
    請求項１乃至３のいずれか一項に記載の多重殻タンク。     The connecting member has a deformation allowing portion that allows relative displacement of the outer edge with respect to the inner edge by elastically deforming.
    A multi-shell tank according to any one of claims 1 to 3.
  5. 　前記接続部材は、前記内縁部を含む内リング部と、前記内リング部から前記上下方向に離れて配置され且つ前記外縁部を含む外リング部と、前記内リング部と前記外リング部に挟まれた態様で前記内リング部と前記外リング部とを前記上下方向に接続する筒部とを有する、
    請求項１乃至４のいずれか一項に記載の多重殻タンク。     The connecting member is sandwiched between an inner ring portion including the inner edge portion, an outer ring portion disposed apart from the inner ring portion in the vertical direction and including the outer edge portion, and the inner ring portion and the outer ring portion. a cylindrical portion connecting the inner ring portion and the outer ring portion in the vertical direction in a manner that
    A multi-shell tank according to any one of claims 1 to 4.
PCT/JP2022/035480 2022-09-22 2022-09-22 Multi-shell tank WO2024062623A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/035480 WO2024062623A1 (en) 2022-09-22 2022-09-22 Multi-shell tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/035480 WO2024062623A1 (en) 2022-09-22 2022-09-22 Multi-shell tank

Publications (1)

Publication Number Publication Date
WO2024062623A1 true WO2024062623A1 (en) 2024-03-28

Family

ID=90454173

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/035480 WO2024062623A1 (en) 2022-09-22 2022-09-22 Multi-shell tank

Country Status (1)

Country Link
WO (1) WO2024062623A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5241882B2 (en) * 1972-04-13 1977-10-21
JPS57200797A (en) * 1981-05-26 1982-12-09 Seneru Injinieria I Shisutemas Tank mechanism for transporting liquefied gas
JP2001153298A (en) * 1999-11-29 2001-06-08 Hiroshima Gas Kk Outer tank support structure of vertical heat insulating low temperature tank
JP2012112474A (en) * 2010-11-25 2012-06-14 Nippon Steel Engineering Co Ltd Support structure of vertical cryogenic liquid storage tank

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5241882B2 (en) * 1972-04-13 1977-10-21
JPS57200797A (en) * 1981-05-26 1982-12-09 Seneru Injinieria I Shisutemas Tank mechanism for transporting liquefied gas
JP2001153298A (en) * 1999-11-29 2001-06-08 Hiroshima Gas Kk Outer tank support structure of vertical heat insulating low temperature tank
JP2012112474A (en) * 2010-11-25 2012-06-14 Nippon Steel Engineering Co Ltd Support structure of vertical cryogenic liquid storage tank

Similar Documents

Publication Publication Date Title
JP5722793B2 (en) Cryogenic liquid storage tank
US4181235A (en) Liquefied natural gas tank construction
RU2307973C2 (en) Reservoir for storing cryogenic fluid medium and method of manufacture of hermetically sealed reservoir
WO2024062623A1 (en) Multi-shell tank
WO2024062622A1 (en) Multi-shell tank
CN101473162A (en) Extended spherical lng storage tank and method for manufacturing the same
WO2024062625A1 (en) Multi-shell tank and vessel
WO2024062621A1 (en) Multi-layer tank and marine vessel
JP2014163141A (en) Assembly method for lng tank, and lng tank assembled by the same
WO2024024092A1 (en) Liquefied gas tank
CN209638764U (en) Large-scale low-temperature storage tank
CN213686232U (en) Middle heavy-duty supporting device for vertical chromium-molybdenum steel container
JPH10264990A (en) Flat-bottomed cylindrical tank
WO2024062624A1 (en) Multiple-wall tank and vessel
JP2016182878A (en) Tank support structure and ship
CN115127395B (en) Fine leveling supporting device for rocket launching erection support
KR830000952B1 (en) Construction method for liquefied natural gas tank
US20230098545A1 (en) Saddle bottom storage tank
JP7498659B2 (en) Triple-shell tank
JP7490904B1 (en) Seismic isolation device and seismic isolation device system
JP2001270594A (en) Cylindrical tank having flat bottom
JPH059593Y2 (en)
TWI844807B (en) Triple Shell Tank
JPH11236998A (en) Ground low-temperature storage tank
JP2024004406A (en) Multiple shell tank

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22959587

Country of ref document: EP

Kind code of ref document: A1