WO2022210836A1 - Double-hull tank and vessel - Google Patents

Double-hull tank and vessel Download PDF

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Publication number
WO2022210836A1
WO2022210836A1 PCT/JP2022/015826 JP2022015826W WO2022210836A1 WO 2022210836 A1 WO2022210836 A1 WO 2022210836A1 JP 2022015826 W JP2022015826 W JP 2022015826W WO 2022210836 A1 WO2022210836 A1 WO 2022210836A1
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WO
WIPO (PCT)
Prior art keywords
tank
inner tank
double
main body
joined
Prior art date
Application number
PCT/JP2022/015826
Other languages
French (fr)
Japanese (ja)
Inventor
太一郎 下田
晴彦 冨永
邦彦 持田
森 田中
達也 今井
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
Publication of WO2022210836A1 publication Critical patent/WO2022210836A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers

Definitions

  • the present disclosure relates to a double-hull tank and a ship equipped with the same.
  • Patent Literature 1 discloses a liquefied gas carrier in which a double-hulled tank mounted on the hull is covered with a tank cover.
  • a vacuum layer is formed as a heat insulating layer between the inner and outer tanks of the double-hulled tank.
  • the inner tank includes an inner tank body for storing liquefied gas and an inner tank dome projecting upward from the inner tank body
  • the outer tank includes an outer tank body surrounding the inner tank body and an inner tank dome. Includes surrounding outer tank dome.
  • the inner tank dome is a portion for consolidating various types of piping such as liquefied gas transfer piping and electrical piping, and is penetrated by these piping.
  • a bellows is incorporated in the outer tank dome.
  • the bellows divides the outer tank dome into an upper movable portion and a lower fixed portion.
  • the movable portion of the outer tank dome is connected to the inner tank dome by a connecting member so as to be displaced together with the inner tank dome when the inner tank thermally shrinks.
  • the outer tank dome is divided into an upper movable part and a lower fixed part, and the movable part and the fixed part are connected via a bellows, so that the movable part of the outer tank dome and the inner tank dome are separated. are connected via a connecting member having an extendable portion.
  • the inner tank and the outer tank are connected at the inner tank dome and the outer tank dome.
  • each of the outer tank dome and the inner tank dome is formed to form an access path for accessing the inner tank from the outside of the tank.
  • the communication hole in the inner dome cannot be opened until after the communication hole in the outer dome is opened and the gas between the inner and outer tanks is purged.
  • the outer dome is omitted.
  • the outer tank and the inner tank main body are connected to the inner tank dome so that the airtightness of the inner tank and the outer tank can be secured.
  • the problem is how to absorb the relative displacement due to the difference.
  • the present disclosure has been made in view of the above circumstances, and its object is to connect an outer tank and an inner tank body to an inner tank projecting portion (inner tank dome) projecting from the inner tank body in a double-shell tank.
  • the object of the present invention is to provide a structure capable of absorbing the relative displacement caused by the difference in degree of heat shrinkage between the outer tank and the inner tank main body.
  • a double-hulled tank includes: an inner tank main body for containing a liquefied gas; an inner tank protruding part that protrudes in a predetermined protruding direction from an inner tank opening arranged in the inner tank main body; and an opening edge of the inner tank opening and the inner tank protruding part.
  • a ship according to the present disclosure is characterized by comprising a hull and the double-hull tank supported by the hull.
  • the inner tank projecting portion is joined to the outer tank, and the inner tank projecting portion is connected to the inner tank main body through the connecting portion.
  • the connecting part has a telescopic structure that can be expanded and contracted in the projecting direction by elastic deformation, even if the inner tank main body and the outer tank are relatively displaced, excessive load will not be applied to the constituent elements of the double shell tank.
  • both the outer tub and the inner tub body can be structurally connected to the inner tub protrusion.
  • the present disclosure in a double-shell tank, it is possible to propose a structure in which the outer tank and the inner tank body are connected to the inner tank projecting portion (inner tank dome) projecting from the inner tank body.
  • FIG. 1 is a schematic side view of a ship equipped with a double-shell tank according to this embodiment.
  • FIG. 2 is a schematic cross-sectional view of a double-hulled tank.
  • FIG. 3 is an enlarged cross-sectional view of the top of the double-hulled tank.
  • FIG. 4 is a diagram showing how the inner tank and the outer tank are displaced relative to each other due to heat shrinkage.
  • FIG. 5 is a schematic cross-sectional view of the top of a double-hulled tank according to a first modification.
  • FIG. 6 is a schematic cross-sectional view of the top of a double-hulled tank according to a second modification.
  • FIG. 5 is a schematic cross-sectional view of the top of a double-hulled tank according to a first modification.
  • FIG. 6 is a schematic cross-sectional view of the top of a double-hulled tank according to a second modification.
  • FIG. 7 is a schematic cross-sectional view of the top of a double-hulled tank according to a third modification.
  • FIG. 8 is a schematic cross-sectional view of the top of a double-hulled tank according to a fourth modification.
  • FIG. 9 is a schematic cross-sectional view of the top of a double-hulled tank according to a fifth modification.
  • the “inner side” means the side near the center of the space in the inner tank of the double-shell tank
  • the “outside” means the center part of the space in the inner tank of the double-shell tank. means the far side from
  • FIG. 1 is a schematic side view of a ship 1 equipped with a double-shell tank 2 according to this embodiment.
  • ship 1 comprises at least one double-hull tank 2 and a hull 11 supporting double-hull tank 2 .
  • the ship 1 is a liquefied gas carrier that carries low-temperature liquefied gas.
  • liquefied gas include LNG, liquefied nitrogen, liquefied hydrogen, and liquefied helium.
  • FIG. 2 is a schematic cross-sectional view of the double-hull tank 2.
  • the double-shell tank 2 includes an inner tank 3 and an outer tank 4 containing the inner tank 3 .
  • the outer tank 4 is surrounded by a tank cover 12 that covers the top, and retaining walls 14 that cover the sides and bottom.
  • the upper portion of the outer tank 4 may be covered with a portion of the hull 11 instead of the tank cover 12 .
  • the retaining wall 14 may be formed, for example, by a part of the hull 11 .
  • a storage space 51 inside the inner tank 3 contains liquefied gas. Between the inner tank 3 and the outer tank 4, an airtight space (hereinafter referred to as cold insulation space 52) is formed. A heat insulating material is arranged in the cold insulation space 52 . Furthermore, the cold insulation space 52 is filled with a gas having a boiling point higher than the boiling point of the liquefied gas stored in the storage space 51 . In this embodiment, the cold insulation space 52 is filled with the vaporized gas of the liquefied gas in the storage space 51 . In this way, when the storage space 51 and the cold insulation space 52 are filled with the same gas, the cold insulation space 52 may communicate with the cold insulation space 52 in the inner tank 3 .
  • a substantially sealed space (hereinafter referred to as a retaining space 53) is formed between the outer tank 4, the tank cover 12 and the retaining wall 14, a substantially sealed space (hereinafter referred to as a retaining space 53) is formed.
  • the holding space 53 is filled with, for example, a non-combustible gas such as nitrogen gas or inert gas, a flame-retardant gas, or dry air.
  • the holding space 53 according to this embodiment is filled with nitrogen gas.
  • the inner tank 3 has an inner tank main body 31 , an inner tank protruding portion 32 , and a connecting portion 37 that connects the inner tank main body 31 and the inner tank protruding portion 32 .
  • the inner tank 3 has an inner tank main body 31 , a connecting portion 37 , and a space surrounded by the inner tank main body 31 .
  • the inner tank main body 31 is a storage container for liquefied gas.
  • the inner tank protruding part 32 protrudes into the exposure space above the tank cover 12 in order to directly lead the pipe passing through the inside of the inner tank 3 to the exposure without passing through other spaces. A space communicating with the inside of the inner tank main body 31 is formed.
  • the projecting direction X of the inner tank projecting portion 32 from the inner tank main body 31 is the vertical direction in this embodiment.
  • the inner tank projecting portion 32 has a dome shape and includes a cylindrical peripheral wall and a ceiling wall that closes an upper opening of the peripheral wall.
  • the inner tank 3 is provided with a tower 20 extending from the top of the inner tank projecting portion 32 to the bottom of the inner tank body 31 .
  • a pump for pumping up the liquefied gas is installed in the lower part of the tower 20 .
  • a liquid feed pipe and an electric pipe are connected to the pump, and these liquid feed pipe and electric pipe pass through the inside of the tower 20 and extend to the outside through the exposed portion of the inner tank projecting portion 32 .
  • the pump arranged at the bottom of the tower 20 may be omitted.
  • the tower 20 is also penetrated by a pneumatic tube 91.
  • the pneumatic pipe 91 guides the boil-off gas generated by the vaporization of the liquefied gas in the inner tank 3 from the inner tank 3 through the inner tank projecting portion 32 to other equipment outside the double-shell tank 2 .
  • Other equipment is, for example, a propulsion engine, a power generation engine, a reliquefaction device, an atmospheric release device, and the like.
  • at least one inter-tank pipe 92 is passed through the cold insulation space 52 between the inner tank 3 and the outer tank 4 .
  • the inter-tank pipe 92 may be appropriately supported by a structural member arranged in the cold insulation space 52 .
  • the inter-tank pipe 92 may be any one of a liquid feed pipe, an air pipe, and an electric pipe. Specific examples of the inter-tank pipe 92 include a purge pipe, a sampling pipe, an air supply pipe, and the like.
  • the parts where the pipes such as the pneumatic pipe 91 and the inter-tank pipe 92 penetrate are provided with airtight construction to ensure airtightness between the tanks and the pipes, and the same Heat insulation construction may be applied.
  • FIG. 3 is an enlarged cross-sectional view of the top of the double-hull tank 2. As shown in FIG.
  • an inner tank opening 35 is provided at the top of the inner tank body 31 .
  • a lower end of a connecting portion 37 is joined to the inner tank opening 35 .
  • the connecting portion 37 rises upward from the opening edge of the inner tank opening 35 .
  • the upper end of the connecting portion 37 is rigidly joined to the inner wall of the inner tank protruding portion 32 in the upper and lower middle portions. That is, the upper portion of the connecting portion 37 is covered with the inner tank projecting portion 32 .
  • the inner tank main body 31 is covered with the outer tank 4 .
  • both the inner tank main body 31 and the outer tank 4 are spherical.
  • the spherical shape includes, in addition to the true spherical shape, a vertically or horizontally stretched spherical shape (capsule shape) and an elliptical shape.
  • the inner tub 3 and the outer tub 4 are not necessarily limited to a spherical shape, and may be rectangular.
  • An outer tank opening 44 substantially concentric with the inner tank opening 35 of the inner tank 3 is provided at the top of the outer tank 4, and the outer tank opening 44 and the lower end of the peripheral wall of the inner tank projecting portion 32 are rigidly joined. ing.
  • a flange portion 39 projecting radially from the peripheral wall is provided on the inner tank projecting portion 32 .
  • the inner tank projecting portion 32 is loosely inserted in the opening 12a provided in the tank cover 12 in the vertical direction.
  • the flange portion 39 and the opening edge of the opening 12a of the tank cover 12 face each other in the vertical direction.
  • These are connected by a bellows 13 that can be expanded and contracted in the vertical direction.
  • a tubular bellows 13 having a bellows-shaped cross section is employed.
  • a rubber expansion joint may be used instead of the bellows 13 .
  • the connecting portion 37 is composed of a combination of a ring plate member 37a and a tubular member 37b.
  • the annular plate member 37a is a ring-shaped plate-like member whose thickness direction is the projecting direction X
  • the tubular member 37b is a cylindrical member extending in the projecting direction X.
  • the annular plate member 37a and the tubular member 37b may be composed of a plurality of plate members joined together.
  • the ring plate member 37a and the cylinder member 37b have a plate thickness of, for example, about 10 to 60 mm, and are made of the same material as the inner tank main body 31.
  • the connecting portion 37 composed of the annular plate member 37a and the cylindrical member 37b is interposed between the inner tank main body 31 and the inner tank protruding portion 32 to transmit the load.
  • the ring plate member 37a When the inner peripheral edge and the outer peripheral edge of the ring-shaped ring plate member 37a are pulled apart in the projecting direction X, the ring plate member 37a is easily elastically deformed and the inner peripheral edge and the outer peripheral edge are separated in the projecting direction X. Relative displacement in the direction is possible.
  • the cylindrical member 37b When the cylindrical member 37b is also pulled in the projecting direction X, it can be stretched due to elastic deformation, but the ring plate member 37a is more likely to be elastically deformed than the cylindrical member 37b. It is desirable that the ring plate member 37a be elastically deformable more easily than the inner tank main body 31 and the inner tank projecting portion 32 .
  • the connecting portion 37 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and a first ring plate having an outer peripheral edge joined to the upper end of the first cylindrical member 37b.
  • a member 37a, a second tubular member 37b whose lower end is joined to the inner peripheral edge of the first annular plate member 37a, and a second annular plate member 37a whose inner peripheral edge is joined to the upper end of the second tubular member 37b. consists of The outer peripheral edge of the second ring plate member 37a is joined to the inner tank projecting portion 32. As shown in FIG.
  • the upper end of the connecting portion 37 (that is, the outer peripheral edge of the second ring plate member 37a) is joined to the inner wall of the inner tank protruding portion 32 at a position above the tank cover 12 and the flange portion 39.
  • the second cylindrical member 37b has a smaller diameter than the inner tank protrusion 32, and the second cylindrical member 37b and the inner tank protrusion 32 are separated from each other.
  • the connecting portion 37 and the inner tank projecting portion 32 form a space inside the inner tank projecting portion 32 that communicates with the space between the outer tank 4 and the inner tank main body 31 . This space becomes part of the cold insulation space 52 (that is, the additional cold insulation space 52) and is used for piping and cold insulation.
  • the inter-tank pipe 92 passes through the cold insulation space 52 between the outer tank 4 and the inner tank main body 31 .
  • the inter-tank pipe 92 passes through the additional cold insulation space 52 between the inner tank projecting portion 32 and the connecting portion 37 .
  • a portion of the inner tank projecting portion 32 through which the inter-tank pipe 92 penetrates is above the tank cover 12 and is exposed. In this way, the inter-tank pipe 92 passes through only the cold insulation space 52 and is directly led to the exposure. In other words, the inter-tank pipe 92 is directly led to the exposure without passing through the storage space 51 and the holding space 53 .
  • FIG. 4 is a diagram showing how the inner tub 3 and the outer tub 4 are displaced relative to each other due to heat shrinkage. In this figure, deformation due to heat shrinkage of the inner tank 3 is exaggerated. As shown in FIG. 4, when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the distance between the inner tank main body 31 and the outer tank 4 increases.
  • the inner tank main body 31 is displaced relative to the inner tank protrusion 32, and the inner tank main body 31 and the inner tank protrusion are displaced relative to each other.
  • the interval in the projecting direction X of 32 is also increased.
  • the relative displacement between the inner tank main body 31 and the inner tank protruding portion 32 is absorbed by the extension of the connecting portion 37 in the protruding direction X.
  • the connecting portion 37 is pulled in the projecting direction X by the inner tank projecting portion 32 and the inner tank main body 31, so that mainly the ring plate member 37a is elastically deformed and the connecting portion 37 extends in the projecting direction X.
  • FIG. 5 is a schematic cross-sectional view of the top of a double-shell tank 2A according to the first modification.
  • the double-shell tank 2A according to the first modified example differs in the structure of the connecting portion 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2A according to the first modified example will be described in detail below.
  • the connecting portion 37 of the inner tank 3 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and the upper end of the first cylindrical member 37b.
  • a first annular plate member 37a whose outer peripheral edge is joined to the first ring plate member 37a, a second cylindrical member 37b whose lower end is joined to the inner peripheral edge of the first annular plate member 37a, and an upper end of the second cylindrical member 37b. It consists of a second ring plate member 37a to which the periphery is joined.
  • the outer peripheral edge of the second ring plate member 37a is joined to the lower end of the inner tank projecting portion 32.
  • Such a connecting portion 37 is accommodated within the thickness between the inner tank main body 31 and the outer tank 4 .
  • the inner tank main body 31 when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the protruding direction X is widened, but the extension of the connecting portion 37 in the protruding direction X prevents the inner tank main body 31 and the inner tank from being subjected to an excessive load. The connection of the projecting portion 32 is maintained.
  • FIG. 6 is a schematic cross-sectional view of the top of a double-shell tank 2B according to a second modification.
  • the double-shell tank 2B according to the second modification differs in the structure of the connecting part 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2B according to the second modified example will be described in detail below.
  • the connecting portion 37 of the inner tank 3 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and the upper end of the first cylindrical member 37b. and a second cylindrical member 37b whose lower end is joined to the outer peripheral edge of the first annular plate member 37a.
  • the upper end of the second cylindrical member 37b is joined to the inner wall of the outer tank 4.
  • the connection part 37 is accommodated within the thickness between the inner tank main body 31 and the outer tank 4 .
  • the inner tank projecting portion 32 and the connecting portion 37 are not directly joined. However, since the inner tank projecting portion 32 and the outer tank 4 are rigidly connected, it can be assumed that the inner tank projecting portion 32 and the connecting portion 37 are connected via a part of the outer tank 4. can be done.
  • the inner tank main body 31 when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the protruding direction X is widened, but the extension of the connecting portion 37 in the protruding direction X prevents the inner tank main body 31 and the inner tank from being subjected to an excessive load. The connection of the projecting portion 32 is maintained.
  • FIG. 7 is a schematic cross-sectional view of the top of a double-shell tank 2C according to a third modification.
  • the double-shell tank 2C according to the third modification differs in the structure of the connecting portion 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2C according to the third modified example will be described in detail below.
  • connection part 37 of the inner tank 3 is connected to the first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31 and to the lower end of the inner tank projecting part 32. It consists of a joined second tubular member 37b and a tubular expandable member 37c connecting between the first tubular member 37b and the second tubular member 37b.
  • the second tubular member 37b and the inner tank projecting portion 32 may be configured integrally.
  • the expandable member 37c is a member that can expand and contract in the projecting direction X. As shown in FIG. A bellows pipe, a corrugated pipe, a membrane, or the like, for example, may be used as the elastic member 37c.
  • the inner tank main body 31 when the inner tank main body 31 is relatively displaced with respect to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the projecting direction X is widened, but the extension of mainly the elastic member 37c of the connecting portion 37 in the projecting direction X causes an excessive load on the inner tank 3. Without this, the connection between the inner tank main body 31 and the inner tank projecting portion 32 is maintained.
  • FIG. 8 is a schematic cross-sectional view of the top of a double-shell tank 2D according to a fourth modification.
  • the double-shell tank 2D according to the fourth modification differs from the double-shell tank 2 according to the above-described embodiment in that an intermediate tank 6 is provided between the inner tank 3 and the outer tank 4. differ.
  • the double-shell tank 2D can also be said to be a triple-shell tank having three layers of tanks.
  • the intermediate tank 6 is arranged between the inner tank 3 and the outer tank 4 , the inner tank 3 is accommodated in the intermediate tank 6 , and the intermediate tank 6 is accommodated in the outer tank 4 .
  • the inner tank 3 and the intermediate tank 6 are separated from each other, and a first cold insulation space 52a is formed between these tanks. Further, the intermediate tank 6 and the outer tank 4 are separated from each other, and a second cold insulation space 52b is formed between these tanks.
  • the inner tank 3 has an inner tank main body 31 , an inner tank protruding portion 32 , and a connecting portion 37 that connects the inner tank main body 31 and the inner tank protruding portion 32 .
  • the connecting portion 37 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, a first annular plate member 37a having an inner peripheral edge joined to the upper end of the first cylindrical member 37b, a first A second cylindrical member 37b whose lower end is joined to the outer peripheral edge of the ring plate member 37a, a second ring plate member 37a whose outer peripheral edge is joined to the upper end of the second cylindrical member 37b, and a second ring plate member It consists of a third tubular member 37b whose lower end is joined to the inner peripheral edge of the third tubular member 37a, and a third annular plate member 37a whose inner peripheral edge is joined to the upper end of the third tubular member 37b.
  • the outer peripheral edge of the third ring plate member 37a is joined to the upper and lower middle portions of the inner wall of the inner tank projecting portion 32 .
  • An intermediate tank opening 66 is provided at the top of the intermediate tank 6, and the opening edge of the intermediate tank opening 66 and the second cylindrical member 37b are joined.
  • the outer tank opening 44 of the outer tank 4 is joined to the lower end of the inner tank projecting portion 32 .
  • the connecting portion 37 extends in the protruding direction X mainly due to the deformation of the first to third ring plate members 37a of the connecting portion 37.
  • FIG. 9 is a schematic cross-sectional view of the top of a double-shell tank 2E according to the fifth modification.
  • the double-shell tank 2E according to the fifth modification differs from the double-shell tank 2 according to the above-described embodiment in that the inner tank projecting portion 32 has a flat roof shape instead of a dome shape. differ.
  • the tank cover 12 is not provided above the inner tank protrusion 32, and the inner tank protrusion 32 is exposed.
  • An outer tank opening 44 of the outer tank 4 is rigidly joined to the inner tank projecting portion 32 .
  • the outer tank 4 may have a space for accommodating the inner tank 3.
  • the outer tank 4 may be one that surrounds the inner tank 3 independently from the hull 11, or one that surrounds the inner tank 3 using the hull 11. It may also be in a mode of doing so. That is, the outer tank 4 may be formed by a part of the hull 11 such as the tank cover 12 and the retaining wall 14 .
  • the inner tank projecting portion 32 is connected to the inner tank 3 via a connecting portion 37 .
  • the connecting portion 37 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, a ring plate member 37a having an inner peripheral edge joined to the upper end of the first cylindrical member 37b, and a ring plate member. It consists of a second cylindrical member 37b whose lower end is joined to the outer peripheral edge of 37a. The upper end of the second cylindrical member 37b is joined to the inner tank projecting portion 32. As shown in FIG.
  • the inner tank main body 31 when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank projecting portion 32 in the projecting direction X is widened. The connection between the inner tank main body 31 and the inner tank projecting portion 32 is maintained without excessive load being applied to the tank main body 31 .
  • the double shell tanks 2, 2A to 2E are An inner tank main body 31 containing a liquefied gas, an inner tank projecting portion 32 projecting in a predetermined projecting direction X from an inner tank opening 35 arranged in the inner tank main body 31, and an opening edge of the inner tank opening 35 and the inner tank.
  • connection part 37 is characterized by having an elastic structure (annular plate member 37a or an elastic member 37c) that can be expanded and contracted in the projecting direction X by elastic deformation.
  • the ship 1 is characterized by having a hull 11 and double-hull tanks 2, 2A to 2E supported by the hull 11.
  • the inner tank projecting portion 32 is joined to the outer tank 4, and the inner tank projecting portion 32 is connected to the inner tank main body 31 via the connecting portion 37.
  • the connecting part 37 has a telescopic structure that can be expanded and contracted in the projecting direction X by elastic deformation, even if the inner tank main body 31 and the outer tank 4 are displaced relative to each other, the double shell tanks 2, 2A to 2E are constructed.
  • Both the outer tub 4 and the inner tub body 31 can be structurally connected to the inner tub projection 32 so that the elements are not overstressed.
  • both the outer tank 4 and the inner tank main body 31 can be structurally connected to the inner tank projecting portion 32 so that excessive loads are not applied to the penetrating pipes (for example, the pneumatic pipe 91 and the inter-tank pipe 92).
  • the elastic structure of the connecting portion 37 is a ring-shaped structure having the projecting direction X as the thickness direction.
  • ring plate member 37a In this case, the connecting portion 37 may be configured by a combination of at least one annular plate member 37a and at least one tubular member 37b extending in the projecting direction X. As shown in FIG.
  • the connecting portion 37 In the elastic structure of the connecting portion 37 as described above, the inner peripheral edge and the outer peripheral edge of the ring plate member 37a are pulled in the projecting direction X opposite to each other, so that the ring plate member 37a extends in the projecting direction X.
  • the connecting portion 37 can be elongated or shortened in the projecting direction X by such elastic deformation of the ring plate member 37a.
  • the ring plate member 37 a functions as a structural member that transmits a load between the inner tank main body 31 and the inner tank protruding portion 32 , and the connecting portion 37 can support the inner tank main body 31 or the inner tank protruding portion 32 .
  • the connecting portion 37 of the inner tank 3 includes the first end (lower end) joined to the opening edge of the inner tank opening 35 and the inner wall of the inner tank projecting portion 32 . and a second end (upper end) joined to and between the inner wall of the inner tank projecting portion 32 and the outer wall of the connecting portion 37, the cold insulation space 52 between the inner tank main body 31 and the outer tank 4 A continuous additional cold insulation space 52 is formed.
  • the additional cold insulation space 52 can be used for cold insulation within the connecting portion 37 . Further, the additional cold insulation space 52 can be used as a space for passing an inter-tank pipe 92 passing between the inner tank main body 31 and the outer tank 4 . In this case, it is desirable that the inter-tank pipe 92 passes through the cold insulation space 52 and the additional cold insulation space 52, penetrates the exposed portion of the inner tank projecting portion 32, and extends to the outside. As a result, the inter-tank pipe 92 passes through only the cold insulation space 52 and is led out to the exposure without passing through the storage space 51 or the holding space 53 .
  • the intermediate tank 6 containing the inner tank body 31 is arranged between the inner tank body 31 and the outer tank 4, and the connecting part 37 penetrates the intermediate tank 6.
  • the opening edge of the intermediate tank opening 66 and the connecting portion 37 are joined.
  • the expansion structure of the connecting portion 37 includes a bellows pipe.
  • the elastic structure of the connecting portion 37 is not limited to the ring plate member 37a.
  • the double shell tanks 2, 2A to 2E according to the above embodiment are spherical (or square) tanks independent of the hull 11, but they may be membrane tanks using the hull 11.
  • the present disclosure can be applied to a membrane tank by replacing the inner tank 3 with a membrane and the outer tank 4 with a barrier or a hull in the above embodiment.
  • the double shell tanks 2, 2A to 2E according to the above embodiment are cargo tanks, but the double shell tanks 2, 2A to 2E do not necessarily need to be mounted on the ship 1 as cargo tanks, and can be used as fuel tanks. may be installed. Also, the number of double-shell tanks 2, 2A-2E mounted on the ship 1 is not specified.

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Abstract

This double-hull tank comprises: an inner tank that has an inner tank body for storing a liquified gas, an inner tank projection part projecting more in a prescribed projecting direction than an inner tank opening disposed in the inner tank body, and a connection part connecting the opening edge of the inner tank opening and the inner tank projection part, and that has formed therein a space surrounded by the inner tank body, the connection part, and the inner tank projection part; and an outer tank which stores the inner tank body and which is joined to the inner tank projection part. The connection part has an elongation/contraction structure that is elongatable/contractable in the projecting direction through elastic deformation.

Description

二重殻タンク及び船舶Double-hull tanks and ships
　本開示は、二重殻タンク及びそれを備える船舶に関する。 The present disclosure relates to a double-hull tank and a ship equipped with the same.
　従来から、二重殻タンクを備える液化ガス運搬船が知られている。例えば、特許文献１には、船体に搭載された二重殻タンクがタンクカバーで覆われた液化ガス運搬船が開示されている。 Liquefied gas carriers equipped with double-hull tanks have been known for some time. For example, Patent Literature 1 discloses a liquefied gas carrier in which a double-hulled tank mounted on the hull is covered with a tank cover.
　特許文献１に開示された液化ガス運搬船では、二重殻タンクの内槽と外槽との間に断熱層として真空層が形成されている。より詳しくは、内槽は、液化ガスを貯留する内槽本体と、内槽本体から上向きに突出する内槽ドームを含み、外槽は、内槽本体を取り囲む外槽本体と、内槽ドームを取り囲む外槽ドームを含む。内槽ドームは、液化ガス移送配管や電気配管などの各種配管を集約するための部分であり、それらの配管に貫通される。 In the liquefied gas carrier disclosed in Patent Document 1, a vacuum layer is formed as a heat insulating layer between the inner and outer tanks of the double-hulled tank. More specifically, the inner tank includes an inner tank body for storing liquefied gas and an inner tank dome projecting upward from the inner tank body, and the outer tank includes an outer tank body surrounding the inner tank body and an inner tank dome. Includes surrounding outer tank dome. The inner tank dome is a portion for consolidating various types of piping such as liquefied gas transfer piping and electrical piping, and is penetrated by these piping.
　さらに、特許文献１の二重殻タンクでは、外槽ドームにベローズが組み込まれている。このベローズによって、外槽ドームが、上側の可動部と下側の固定部とに分割されている。内槽内に液化ガスが投入されると内槽が熱収縮する。外槽ドームの可動部は、内槽が熱収縮したときに内槽ドームと共に変位するように、連結部材によって内槽ドームと連結されている。 Furthermore, in the double-shell tank of Patent Document 1, a bellows is incorporated in the outer tank dome. The bellows divides the outer tank dome into an upper movable portion and a lower fixed portion. When the liquefied gas is introduced into the inner tank, the inner tank thermally shrinks. The movable portion of the outer tank dome is connected to the inner tank dome by a connecting member so as to be displaced together with the inner tank dome when the inner tank thermally shrinks.
特開２０１５－４３８３号公報JP 2015-4383 A
　特許文献１では、外槽ドームが上側の可動部と下側の固定部とに分割構成され、可動部と固定部とがベローズを介して連結され、外槽ドームの可動部と内槽ドームとが伸縮部を有する連結部材を介して連結されている。このように特許文献１では、内槽と外槽とが、内槽ドームと外槽ドームとにおいて連結されている。 In Patent Document 1, the outer tank dome is divided into an upper movable part and a lower fixed part, and the movable part and the fixed part are connected via a bellows, so that the movable part of the outer tank dome and the inner tank dome are separated. are connected via a connecting member having an extendable portion. Thus, in Patent Document 1, the inner tank and the outer tank are connected at the inner tank dome and the outer tank dome.
　特許文献１のように二重殻タンクが内槽ドーム及び外槽ドームを備える場合、タンク外から内槽内へアクセスするためのアクセス経路を形成するために、外槽ドーム及び内槽ドームのそれぞれに交通孔が必要とされるうえ、外槽ドームの交通孔を開放して内外槽間のガスをパージした後でなければ内槽ドームの交通孔を開放することができない。このような事情から、外槽ドームが省略された二重殻タンクの要望がある。この場合、内槽及び外槽の気密性が確保できるように内槽ドームに外槽及び内槽本体が連結されることとなるが、ここで、外槽と内槽本体との熱収縮度合の差による相対変位をどのように吸収するかが課題となる。 When the double-shell tank includes an inner tank dome and an outer tank dome as in Patent Document 1, each of the outer tank dome and the inner tank dome is formed to form an access path for accessing the inner tank from the outside of the tank. Moreover, the communication hole in the inner dome cannot be opened until after the communication hole in the outer dome is opened and the gas between the inner and outer tanks is purged. Under these circumstances, there is a demand for a double shell tank in which the outer dome is omitted. In this case, the outer tank and the inner tank main body are connected to the inner tank dome so that the airtightness of the inner tank and the outer tank can be secured. The problem is how to absorb the relative displacement due to the difference.
　本開示は以上の事情に鑑みてなされたものであり、その目的は、二重殻タンクにおいて、内槽本体から突出した内槽突出部（内槽ドーム）に外槽及び内槽本体を連結する構造であって、外槽及び内槽本体の熱収縮度合の差による相対変位を吸収し得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 its object is to connect an outer tank and an inner tank body to an inner tank projecting portion (inner tank dome) projecting from the inner tank body in a double-shell tank. The object of the present invention is to provide a structure capable of absorbing the relative displacement caused by the difference in degree of heat shrinkage between the outer tank and the inner tank main body.
　本開示に係る二重殻タンクは、
液化ガスを収容する内槽本体、前記内槽本体に配置された内槽開口よりも所定の突出方向へ突出した内槽突出部、及び、前記内槽開口の開口縁と前記内槽突出部とを連結する連結部とを有し、前記内槽本体、前記連結部、及び前記内槽突出部に囲まれた空間が内部に形成された内槽と、
前記内槽本体を収容し、前記内槽突出部と接合された外槽とを備え、
前記連結部が弾性変形により前記突出方向へ伸縮可能な伸縮構造を有することを特徴としている。 A double-hulled tank according to the present disclosure includes:
an inner tank main body for containing a liquefied gas; an inner tank protruding part that protrudes in a predetermined protruding direction from an inner tank opening arranged in the inner tank main body; and an opening edge of the inner tank opening and the inner tank protruding part. an inner tank in which a space surrounded by the inner tank main body, the connecting part, and the inner tank protruding part is formed;
An outer tank containing the inner tank main body and joined to the inner tank protrusion,
It is characterized in that the connecting portion has a stretchable structure capable of stretching in the projecting direction by elastic deformation.
　本開示に係る船舶は、船体と、前記船体に支持された前記二重殻タンクとを備えることを特徴としている。 A ship according to the present disclosure is characterized by comprising a hull and the double-hull tank supported by the hull.
　上記構成の二重殻タンク及びそれを備える船舶では、内槽突出部は外槽と接合され、内槽突出部は内槽本体と連結部を介して連結されている。そして、連結部が弾性変形により突出方向へ伸縮可能な伸縮構造を有することにより、内槽本体と外槽との相対変位が生じても二重殻タンクの構成要素に過剰な負荷がかからないように、内槽突出部に外槽及び内槽本体の両方を構造的に連結できる。 In the double-shell tank having the above configuration and the ship including it, the inner tank projecting portion is joined to the outer tank, and the inner tank projecting portion is connected to the inner tank main body through the connecting portion. In addition, since the connecting part has a telescopic structure that can be expanded and contracted in the projecting direction by elastic deformation, even if the inner tank main body and the outer tank are relatively displaced, excessive load will not be applied to the constituent elements of the double shell tank. , both the outer tub and the inner tub body can be structurally connected to the inner tub protrusion.
　本開示によれば、二重殻タンクにおいて、内槽本体から突出した内槽突出部（内槽ドーム）に外槽及び内槽本体を連結する構造を提案できる。 According to the present disclosure, in a double-shell tank, it is possible to propose a structure in which the outer tank and the inner tank body are connected to the inner tank projecting portion (inner tank dome) projecting from the inner tank body.
図１は、本実施形態に係る二重殻タンクを備えた船舶の概略側面図である。FIG. 1 is a schematic side view of a ship equipped with a double-shell tank according to this embodiment. 図２は、二重殻タンクの概略断面図である。FIG. 2 is a schematic cross-sectional view of a double-hulled tank. 図３は、二重殻タンクの頂部の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of the top of the double-hulled tank. 図４は、熱収縮によって内槽と外槽とに相対変位が生じた様子を示す図である。FIG. 4 is a diagram showing how the inner tank and the outer tank are displaced relative to each other due to heat shrinkage. 図５は、第１変形例に係る二重殻タンクの頂部の概略断面図である。FIG. 5 is a schematic cross-sectional view of the top of a double-hulled tank according to a first modification. 図６は、第２変形例に係る二重殻タンクの頂部の概略断面図である。FIG. 6 is a schematic cross-sectional view of the top of a double-hulled tank according to a second modification. 図７は、第３変形例に係る二重殻タンクの頂部の概略断面図である。FIG. 7 is a schematic cross-sectional view of the top of a double-hulled tank according to a third modification. 図８は、第４変形例に係る二重殻タンクの頂部の概略断面図である。FIG. 8 is a schematic cross-sectional view of the top of a double-hulled tank according to a fourth modification. 図９は、第５変形例に係る二重殻タンクの頂部の概略断面図である。FIG. 9 is a schematic cross-sectional view of the top of a double-hulled tank according to a fifth modification.
　以下、図面を参照しながら、本開示の実施形態について説明する。なお、本明細書において、「内側」とは二重殻タンクの内槽内の空間の中心部分に近い側を意味し、「外側」とは二重殻タンクの内槽内の空間の中心部分から遠い側を意味する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In this specification, the “inner side” means the side near the center of the space in the inner tank of the double-shell tank, and the “outside” means the center part of the space in the inner tank of the double-shell tank. means the far side from
〔船舶１の概略構成〕
　図１は、本実施形態に係る二重殻タンク２を備えた船舶１の概略側面図である。図１に示すように、船舶１は、少なくとも１つの二重殻タンク２と、二重殻タンク２を支持する船体１１とを備える。船舶１は、低温の液化ガスを運搬する液化ガス運搬船である。液化ガスとして、ＬＮＧ、液化窒素、液化水素、液化ヘリウムなどが例示される。 [Schematic configuration of ship 1]
FIG. 1 is a schematic side view of a ship 1 equipped with a double-shell tank 2 according to this embodiment. As shown in FIG. 1 , ship 1 comprises at least one double-hull tank 2 and a hull 11 supporting double-hull tank 2 . The ship 1 is a liquefied gas carrier that carries low-temperature liquefied gas. Examples of liquefied gas include LNG, liquefied nitrogen, liquefied hydrogen, and liquefied helium.
〔二重殻タンク２の概略構成〕
　図２は、二重殻タンク２の概略断面図である。図１及び図２に示すように、二重殻タンク２は、内槽３と、内槽３を収容した外槽４とを備える。外槽４は、上部を覆うタンクカバー１２と、側部及び底部を覆う保持壁１４により包囲されている。タンクカバー１２に代えて船体１１の一部によって外槽４の上部が覆われていてもよい。保持壁１４は、例えば船体１１の一部により形成されていてよい。 [Schematic configuration of double shell tank 2]
FIG. 2 is a schematic cross-sectional view of the double-hull tank 2. As shown in FIG. As shown in FIGS. 1 and 2, the double-shell tank 2 includes an inner tank 3 and an outer tank 4 containing the inner tank 3 . The outer tank 4 is surrounded by a tank cover 12 that covers the top, and retaining walls 14 that cover the sides and bottom. The upper portion of the outer tank 4 may be covered with a portion of the hull 11 instead of the tank cover 12 . The retaining wall 14 may be formed, for example, by a part of the hull 11 .
　内槽３の内部の貯留空間５１には液化ガスが収容される。内槽３と外槽４の槽間には、気密な空間（以下、保冷空間５２と称する）が形成されている。保冷空間５２には、断熱材が配置されている。更に、保冷空間５２には、沸点が貯留空間５１に貯蔵されている液化ガスの沸点以上のガスが充填されている。本実施形態では、貯留空間５１の液化ガスの気化ガスが保冷空間５２に充填されている。このように、貯留空間５１と保冷空間５２とで充填されている気体が同一である場合には、保冷空間５２は内槽３内の保冷空間５２と連通されていてもよい。 A storage space 51 inside the inner tank 3 contains liquefied gas. Between the inner tank 3 and the outer tank 4, an airtight space (hereinafter referred to as cold insulation space 52) is formed. A heat insulating material is arranged in the cold insulation space 52 . Furthermore, the cold insulation space 52 is filled with a gas having a boiling point higher than the boiling point of the liquefied gas stored in the storage space 51 . In this embodiment, the cold insulation space 52 is filled with the vaporized gas of the liquefied gas in the storage space 51 . In this way, when the storage space 51 and the cold insulation space 52 are filled with the same gas, the cold insulation space 52 may communicate with the cold insulation space 52 in the inner tank 3 .
　外槽４とタンクカバー１２及び保持壁１４との間は、ほぼ密閉された空間（以下、保持空間５３と称する）が形成されている。保持空間５３には、例えば、窒素ガス、イナートガスなどの不燃性ガス又は難燃性ガス、或いは、乾燥空気が充填されている。本実施形態に係る保持空間５３には窒素ガスが充填されている。 Between the outer tank 4, the tank cover 12 and the retaining wall 14, a substantially sealed space (hereinafter referred to as a retaining space 53) is formed. The holding space 53 is filled with, for example, a non-combustible gas such as nitrogen gas or inert gas, a flame-retardant gas, or dry air. The holding space 53 according to this embodiment is filled with nitrogen gas.
　内槽３は、内槽本体３１と、内槽突出部３２と、内槽本体３１と内槽突出部３２とを連結する連結部３７とを有する。内槽３には、内槽本体３１、連結部３７、及び内槽本体３１に囲まれた空間が内部に形成されている。内槽本体３１は、液化ガスの収容容器である。内槽突出部３２は、内槽３の内部を通された配管を他の空間を通さずに直接的に曝露へ導くために、タンクカバー１２よりも上方の曝露空間へ突出しており、内部に内槽本体３１の内部と連通された空間が形成されている。内槽本体３１からの内槽突出部３２の突出方向Ｘは、本実施形態においては上下方向である。内槽突出部３２はドーム形状を呈し、筒状の周壁と、周壁の上側開口を閉塞する天井壁とを含む。 The inner tank 3 has an inner tank main body 31 , an inner tank protruding portion 32 , and a connecting portion 37 that connects the inner tank main body 31 and the inner tank protruding portion 32 . The inner tank 3 has an inner tank main body 31 , a connecting portion 37 , and a space surrounded by the inner tank main body 31 . The inner tank main body 31 is a storage container for liquefied gas. The inner tank protruding part 32 protrudes into the exposure space above the tank cover 12 in order to directly lead the pipe passing through the inside of the inner tank 3 to the exposure without passing through other spaces. A space communicating with the inside of the inner tank main body 31 is formed. The projecting direction X of the inner tank projecting portion 32 from the inner tank main body 31 is the vertical direction in this embodiment. The inner tank projecting portion 32 has a dome shape and includes a cylindrical peripheral wall and a ceiling wall that closes an upper opening of the peripheral wall.
　内槽３には、内槽突出部３２の頂部から内槽本体３１の底部まで延びるタワー２０が設けられている。図示は省略するが、タワー２０内の下部には、液化ガスを汲み上げるためのポンプが設置されている。そのポンプには液送管及び電気管が接続され、これらの液送管及び電気管は、タワー２０内を通って、内槽突出部３２の曝露部を貫通して外部まで延びている。但し、タワー２０の底部に配置されるポンプは省略されてもよい。 The inner tank 3 is provided with a tower 20 extending from the top of the inner tank projecting portion 32 to the bottom of the inner tank body 31 . Although illustration is omitted, a pump for pumping up the liquefied gas is installed in the lower part of the tower 20 . A liquid feed pipe and an electric pipe are connected to the pump, and these liquid feed pipe and electric pipe pass through the inside of the tower 20 and extend to the outside through the exposed portion of the inner tank projecting portion 32 . However, the pump arranged at the bottom of the tower 20 may be omitted.
　タワー２０は、気送管９１によっても貫通されている。気送管９１は、内槽３内の液化ガスの気化により発生したボイルオフガスを内槽３から内槽突出部３２を貫通して二重殻タンク２外の他の機器へ導くものである。他の機器は、例えば、推進用エンジン、発電用エンジン、再液化装置、大気開放装置などである。更に、内槽３と外槽４との間の保冷空間５２には、少なくとも１本の槽間配管９２が通されている。槽間配管９２は、保冷空間５２に配置された構造部材に適宜支持されていてよい。槽間配管９２は、送液管、送気管、及び電気管のうちいずれであってもよい。槽間配管９２の具体例としては、パージ用配管、サンプリング配管、給気用配管等が挙げられる。内槽３及び外槽４において、気送管９１や槽間配管９２などの配管が貫通する部分には、槽と配管との間の気密性を確保するための気密施工や、槽と同様の防熱施工が施されていてよい。 The tower 20 is also penetrated by a pneumatic tube 91. The pneumatic pipe 91 guides the boil-off gas generated by the vaporization of the liquefied gas in the inner tank 3 from the inner tank 3 through the inner tank projecting portion 32 to other equipment outside the double-shell tank 2 . Other equipment is, for example, a propulsion engine, a power generation engine, a reliquefaction device, an atmospheric release device, and the like. Further, at least one inter-tank pipe 92 is passed through the cold insulation space 52 between the inner tank 3 and the outer tank 4 . The inter-tank pipe 92 may be appropriately supported by a structural member arranged in the cold insulation space 52 . The inter-tank pipe 92 may be any one of a liquid feed pipe, an air pipe, and an electric pipe. Specific examples of the inter-tank pipe 92 include a purge pipe, a sampling pipe, an air supply pipe, and the like. In the inner tank 3 and the outer tank 4, the parts where the pipes such as the pneumatic pipe 91 and the inter-tank pipe 92 penetrate are provided with airtight construction to ensure airtightness between the tanks and the pipes, and the same Heat insulation construction may be applied.
〔二重殻タンク２の頂部の構成〕
　ここで、二重殻タンク２の頂部の構成について詳細に説明する。図３は、二重殻タンク２の頂部の拡大断面図である。 [Structure of the top part of the double-shell tank 2]
Here, the configuration of the top portion of the double-hull tank 2 will be described in detail. FIG. 3 is an enlarged cross-sectional view of the top of the double-hull tank 2. As shown in FIG.
　図３に示すように、内槽本体３１の頂部には内槽開口３５が設けられている。この内槽開口３５に連結部３７の下端が接合されている。連結部３７は内槽開口３５の開口縁から上方へ立ち上がっている。連結部３７の上端は内槽突出部３２の上下中途部の内壁と剛接合されている。つまり、連結部３７の上部は内槽突出部３２で覆われた態様となっている。 As shown in FIG. 3 , an inner tank opening 35 is provided at the top of the inner tank body 31 . A lower end of a connecting portion 37 is joined to the inner tank opening 35 . The connecting portion 37 rises upward from the opening edge of the inner tank opening 35 . The upper end of the connecting portion 37 is rigidly joined to the inner wall of the inner tank protruding portion 32 in the upper and lower middle portions. That is, the upper portion of the connecting portion 37 is covered with the inner tank projecting portion 32 .
　内槽本体３１は、外槽４に覆われている。本実施形態において、内槽本体３１及び外槽４はいずれも球形である。球形には、真球形に加えて、上下方向又は左右方向にストレッチした球形（カプセル形）や楕円形が含まれる。但し、内槽３及び外槽４は、必ずしも球形に限定されず、方形であってもよい。外槽４の頂部には、内槽３の内槽開口３５と略同心の外槽開口４４が設けられており、この外槽開口４４と内槽突出部３２の周壁の下端とが剛接合されている。 The inner tank main body 31 is covered with the outer tank 4 . In this embodiment, both the inner tank main body 31 and the outer tank 4 are spherical. The spherical shape includes, in addition to the true spherical shape, a vertically or horizontally stretched spherical shape (capsule shape) and an elliptical shape. However, the inner tub 3 and the outer tub 4 are not necessarily limited to a spherical shape, and may be rectangular. An outer tank opening 44 substantially concentric with the inner tank opening 35 of the inner tank 3 is provided at the top of the outer tank 4, and the outer tank opening 44 and the lower end of the peripheral wall of the inner tank projecting portion 32 are rigidly joined. ing.
　内槽突出部３２には、周壁から放射方向へ突出するフランジ部３９が設けられている。内槽突出部３２はタンクカバー１２に設けられた開口１２ａに上下方向に遊挿されている。フランジ部３９と、タンクカバー１２の開口１２ａの開口縁とは上下方向に対峙しており。これらの間は上下方向に伸縮可能なベローズ１３で接続されている。本実施形態では、断面が蛇腹形状を有する管型のベローズ１３が採用されている。ベローズ１３に代えて、ゴム伸縮継手が用いられてもよい。 A flange portion 39 projecting radially from the peripheral wall is provided on the inner tank projecting portion 32 . The inner tank projecting portion 32 is loosely inserted in the opening 12a provided in the tank cover 12 in the vertical direction. The flange portion 39 and the opening edge of the opening 12a of the tank cover 12 face each other in the vertical direction. These are connected by a bellows 13 that can be expanded and contracted in the vertical direction. In this embodiment, a tubular bellows 13 having a bellows-shaped cross section is employed. A rubber expansion joint may be used instead of the bellows 13 .
　連結部３７は、環板部材３７ａと筒部材３７ｂとの組み合わせで構成されている。常温において、環板部材３７ａは突出方向Ｘを厚み方向とするリング型の板状の部材であって、筒部材３７ｂは突出方向Ｘに延びる円筒状の部材である。なお、環板部材３７ａ及び筒部材３７ｂは、互いに接合された複数の板材から構成されていてよい。環板部材３７ａ及び筒部材３７ｂは、例えば、１０～６０ｍｍ程度の板厚を有し、内槽本体３１と同じ材料で構成されている。このような環板部材３７ａ及び筒部材３７ｂからなる連結部３７は、内槽本体３１と内槽突出部３２との間に介在して荷重を伝達できる。 The connecting portion 37 is composed of a combination of a ring plate member 37a and a tubular member 37b. At room temperature, the annular plate member 37a is a ring-shaped plate-like member whose thickness direction is the projecting direction X, and the tubular member 37b is a cylindrical member extending in the projecting direction X. As shown in FIG. The annular plate member 37a and the tubular member 37b may be composed of a plurality of plate members joined together. The ring plate member 37a and the cylinder member 37b have a plate thickness of, for example, about 10 to 60 mm, and are made of the same material as the inner tank main body 31. The connecting portion 37 composed of the annular plate member 37a and the cylindrical member 37b is interposed between the inner tank main body 31 and the inner tank protruding portion 32 to transmit the load.
　リング型の環板部材３７ａの内周縁と外周縁とを突出方向Ｘへ引き離すように引っ張った場合に、環板部材３７ａは容易に弾性変形して内周縁と外周縁とは突出方向Ｘに離れる方向へ相対変位可能である。筒部材３７ｂも突出方向Ｘへ引っ張ると弾性変形により伸長可能であるが、環板部材３７ａのほうが筒部材３７ｂよりも弾性変形しやすい。環板部材３７ａは、内槽本体３１及び内槽突出部３２と比較して弾性変形容易であることが望ましい。 When the inner peripheral edge and the outer peripheral edge of the ring-shaped ring plate member 37a are pulled apart in the projecting direction X, the ring plate member 37a is easily elastically deformed and the inner peripheral edge and the outer peripheral edge are separated in the projecting direction X. Relative displacement in the direction is possible. When the cylindrical member 37b is also pulled in the projecting direction X, it can be stretched due to elastic deformation, but the ring plate member 37a is more likely to be elastically deformed than the cylindrical member 37b. It is desirable that the ring plate member 37a be elastically deformable more easily than the inner tank main body 31 and the inner tank projecting portion 32 .
　本実施形態に係る連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、第１の筒部材３７ｂの上端に外周縁が接合された第１の環板部材３７ａ、第１の環板部材３７ａの内周縁に下端が接合された第２の筒部材３７ｂ、及び、第２の筒部材３７ｂの上端に内周縁が接合された第２の環板部材３７ａからなる。第２の環板部材３７ａの外周縁は、内槽突出部３２と接合されている。 The connecting portion 37 according to the present embodiment includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and a first ring plate having an outer peripheral edge joined to the upper end of the first cylindrical member 37b. A member 37a, a second tubular member 37b whose lower end is joined to the inner peripheral edge of the first annular plate member 37a, and a second annular plate member 37a whose inner peripheral edge is joined to the upper end of the second tubular member 37b. consists of The outer peripheral edge of the second ring plate member 37a is joined to the inner tank projecting portion 32. As shown in FIG.
　連結部３７の上端（即ち、第２の環板部材３７ａの外周縁）は、内槽突出部３２の内壁であって、タンクカバー１２及びフランジ部３９よりも上方の位置と接合されている。また、第２の筒部材３７ｂは、内槽突出部３２よりも小径であって、第２の筒部材３７ｂと内槽突出部３２との間が離間されている。このようにして、連結部３７と内槽突出部３２とによって、内槽突出部３２の内側に外槽４と内槽本体３１の槽間と連通された空間が形成されている。この空間は保冷空間５２の一部（即ち、追加の保冷空間５２）となり、配管や保冷のために利用される。 The upper end of the connecting portion 37 (that is, the outer peripheral edge of the second ring plate member 37a) is joined to the inner wall of the inner tank protruding portion 32 at a position above the tank cover 12 and the flange portion 39. The second cylindrical member 37b has a smaller diameter than the inner tank protrusion 32, and the second cylindrical member 37b and the inner tank protrusion 32 are separated from each other. In this manner, the connecting portion 37 and the inner tank projecting portion 32 form a space inside the inner tank projecting portion 32 that communicates with the space between the outer tank 4 and the inner tank main body 31 . This space becomes part of the cold insulation space 52 (that is, the additional cold insulation space 52) and is used for piping and cold insulation.
　槽間配管９２は、外槽４と内槽本体３１との間の保冷空間５２を通されている。槽間配管９２は、内槽突出部３２と連結部３７との間の追加の保冷空間５２を通されている。内槽突出部３２のうち槽間配管９２が貫いている部分はタンクカバー１２よりも上方であって曝露されている。このように、槽間配管９２は、保冷空間５２のみを通り、直接的に曝露まで導かれている。換言すると、槽間配管９２は、貯留空間５１及び保持空間５３を介さずに直接的に曝露まで導かれている。 The inter-tank pipe 92 passes through the cold insulation space 52 between the outer tank 4 and the inner tank main body 31 . The inter-tank pipe 92 passes through the additional cold insulation space 52 between the inner tank projecting portion 32 and the connecting portion 37 . A portion of the inner tank projecting portion 32 through which the inter-tank pipe 92 penetrates is above the tank cover 12 and is exposed. In this way, the inter-tank pipe 92 passes through only the cold insulation space 52 and is directly led to the exposure. In other words, the inter-tank pipe 92 is directly led to the exposure without passing through the storage space 51 and the holding space 53 .
　内槽本体３１は低温の液化ガスが収容されることから外槽４よりも大きな度合で熱収縮し、内槽本体３１と外槽４との間に相対変位が生じる。図４は、熱収縮によって内槽３と外槽４とに相対変位が生じた様子を示す図である。この図では、内槽３の熱収縮による変形が誇張して示されている。図４に示すように、熱収縮により内槽本体３１が外槽４に対して相対変位すると、内槽本体３１と外槽４の間隔が大きくなる。外槽４と接合されている内槽突出部３２は外槽４に拘束されることから、内槽本体３１は内槽突出部３２に対して相対変位し、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔も大きくなる。内槽本体３１と内槽突出部３２との相対変位は、連結部３７が突出方向Ｘへ伸長することによって吸収される。詳細には、連結部３７が内槽突出部３２及び内槽本体３１によって突出方向Ｘに引っ張られることで、主に環板部材３７ａが弾性変形して連結部３７が突出方向Ｘへ伸長する。 Since the inner tank main body 31 contains low-temperature liquefied gas, it thermally shrinks to a greater extent than the outer tank 4 , and relative displacement occurs between the inner tank main body 31 and the outer tank 4 . FIG. 4 is a diagram showing how the inner tub 3 and the outer tub 4 are displaced relative to each other due to heat shrinkage. In this figure, deformation due to heat shrinkage of the inner tank 3 is exaggerated. As shown in FIG. 4, when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the distance between the inner tank main body 31 and the outer tank 4 increases. Since the inner tank protrusion 32 joined to the outer tank 4 is constrained by the outer tank 4, the inner tank main body 31 is displaced relative to the inner tank protrusion 32, and the inner tank main body 31 and the inner tank protrusion are displaced relative to each other. The interval in the projecting direction X of 32 is also increased. The relative displacement between the inner tank main body 31 and the inner tank protruding portion 32 is absorbed by the extension of the connecting portion 37 in the protruding direction X. As shown in FIG. Specifically, the connecting portion 37 is pulled in the projecting direction X by the inner tank projecting portion 32 and the inner tank main body 31, so that mainly the ring plate member 37a is elastically deformed and the connecting portion 37 extends in the projecting direction X.
〔二重殻タンク２の変形例〕
　以下、上記実施形態に係る二重殻タンク２の第１～５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、詳細な説明を省略する。 [Modified example of double shell tank 2]
First to fifth modifications of the double-shell tank 2 according to the above embodiment will be described below. In the description of the modified example, the same or similar members as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof will be omitted.
＜第１変形例＞
　図５は、第１変形例に係る二重殻タンク２Ａの頂部の概略断面図である。図５に示すように、第１変形例に係る二重殻タンク２Ａは、前述の実施形態に係る二重殻タンク２と対比して連結部３７の構造が異なる。そこで、以下では第１変形例に係る二重殻タンク２Ａについて、連結部３７の構造を詳細に説明する。 <First modification>
FIG. 5 is a schematic cross-sectional view of the top of a double-shell tank 2A according to the first modification. As shown in FIG. 5, the double-shell tank 2A according to the first modified example differs in the structure of the connecting portion 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2A according to the first modified example will be described in detail below.
　第１変形例に係る二重殻タンク２Ａにおいて、内槽３の連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、第１の筒部材３７ｂの上端に外周縁が接合された第１の環板部材３７ａ、第１の環板部材３７ａの内周縁に下端が接合された第２の筒部材３７ｂ、及び、第２の筒部材３７ｂの上端に内周縁が接合された第２の環板部材３７ａからなる。第２の環板部材３７ａの外周縁は、内槽突出部３２の下端と接合されている。このような連結部３７は、内槽本体３１と外槽４との槽間の厚み内に収まっている。 In the double-shell tank 2A according to the first modified example, the connecting portion 37 of the inner tank 3 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and the upper end of the first cylindrical member 37b. A first annular plate member 37a whose outer peripheral edge is joined to the first ring plate member 37a, a second cylindrical member 37b whose lower end is joined to the inner peripheral edge of the first annular plate member 37a, and an upper end of the second cylindrical member 37b. It consists of a second ring plate member 37a to which the periphery is joined. The outer peripheral edge of the second ring plate member 37a is joined to the lower end of the inner tank projecting portion 32. As shown in FIG. Such a connecting portion 37 is accommodated within the thickness between the inner tank main body 31 and the outer tank 4 .
　第１変形例に係る二重殻タンク２Ａにおいて、熱収縮に起因して内槽本体３１が外槽４に対して相対変位すると、外槽４と接合されている内槽突出部３２は外槽４に拘束されることから内槽本体３１は内槽突出部３２に対して相対変位する。これにより、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７が突出方向Ｘへ伸長することによって、過剰な負荷がかかることなく内槽本体３１と内槽突出部３２の連結が維持される。 In the double shell tank 2A according to the first modified example, when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the protruding direction X is widened, but the extension of the connecting portion 37 in the protruding direction X prevents the inner tank main body 31 and the inner tank from being subjected to an excessive load. The connection of the projecting portion 32 is maintained.
＜第２変形例＞
　図６は、第２変形例に係る二重殻タンク２Ｂの頂部の概略断面図である。図６に示すように、第２変形例に係る二重殻タンク２Ｂは、前述の実施形態に係る二重殻タンク２と対比して連結部３７の構造が異なる。そこで、以下では第２変形例に係る二重殻タンク２Ｂについて、連結部３７の構造を詳細に説明する。 <Second modification>
FIG. 6 is a schematic cross-sectional view of the top of a double-shell tank 2B according to a second modification. As shown in FIG. 6, the double-shell tank 2B according to the second modification differs in the structure of the connecting part 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2B according to the second modified example will be described in detail below.
　第２変形例に係る二重殻タンク２Ｂにおいて、内槽３の連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、第１の筒部材３７ｂの上端に内周縁が接合された第１の環板部材３７ａ、及び、第１の環板部材３７ａの外周縁に下端が接合された第２の筒部材３７ｂからなる。第２の筒部材３７ｂの上端は、外槽４の内壁と接合されている。連結部３７は、内槽本体３１と外槽４との槽間の厚み内に収まっている。第２変形例に係る二重殻タンク２Ｂでは、内槽突出部３２と連結部３７とが直接的に接合されていない。しかし、内槽突出部３２と外槽４とが剛接合されていることから、内槽突出部３２と連結部３７とが外槽４の一部を介して接合されていると見做すことができる。 In the double-shell tank 2B according to the second modified example, the connecting portion 37 of the inner tank 3 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, and the upper end of the first cylindrical member 37b. and a second cylindrical member 37b whose lower end is joined to the outer peripheral edge of the first annular plate member 37a. The upper end of the second cylindrical member 37b is joined to the inner wall of the outer tank 4. As shown in FIG. The connection part 37 is accommodated within the thickness between the inner tank main body 31 and the outer tank 4 . In the double-shell tank 2B according to the second modification, the inner tank projecting portion 32 and the connecting portion 37 are not directly joined. However, since the inner tank projecting portion 32 and the outer tank 4 are rigidly connected, it can be assumed that the inner tank projecting portion 32 and the connecting portion 37 are connected via a part of the outer tank 4. can be done.
　第２変形例に係る二重殻タンク２Ｂにおいて、熱収縮に起因して内槽本体３１が外槽４に対して相対変位すると、外槽４と接合されている内槽突出部３２は外槽４に拘束されることから内槽本体３１は内槽突出部３２に対して相対変位する。これにより、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７が突出方向Ｘへ伸長することによって、過剰な負荷がかかることなく内槽本体３１と内槽突出部３２の連結が維持される。 In the double shell tank 2B according to the second modified example, when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the protruding direction X is widened, but the extension of the connecting portion 37 in the protruding direction X prevents the inner tank main body 31 and the inner tank from being subjected to an excessive load. The connection of the projecting portion 32 is maintained.
＜第３変形例＞
　図７は、第３変形例に係る二重殻タンク２Ｃの頂部の概略断面図である。図７に示すように、第３変形例に係る二重殻タンク２Ｃは、前述の実施形態に係る二重殻タンク２と対比して連結部３７の構造が異なる。そこで、以下では第３変形例に係る二重殻タンク２Ｃについて、連結部３７の構造を詳細に説明する。 <Third modification>
FIG. 7 is a schematic cross-sectional view of the top of a double-shell tank 2C according to a third modification. As shown in FIG. 7, the double-shell tank 2C according to the third modification differs in the structure of the connecting portion 37 from the double-shell tank 2 according to the above-described embodiment. Therefore, the structure of the connecting portion 37 of the double-shell tank 2C according to the third modified example will be described in detail below.
　第３変形例に係る二重殻タンク２Ｃにおいて、内槽３の連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、内槽突出部３２の下端に接合された第２の筒部材３７ｂ、及び、第１の筒部材３７ｂと第２の筒部材３７ｂとの間を連結する筒状の伸縮部材３７ｃからなる。第２の筒部材３７ｂと内槽突出部３２とは一体的に構成されていてもよい。伸縮部材３７ｃは、突出方向Ｘへ伸縮可能な部材である。伸縮部材３７ｃとして、例えば、ベローズ管、コルゲート管、及び、メンブレンなどが用いられてよい。 In the double-shell tank 2C according to the third modified example, the connection part 37 of the inner tank 3 is connected to the first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31 and to the lower end of the inner tank projecting part 32. It consists of a joined second tubular member 37b and a tubular expandable member 37c connecting between the first tubular member 37b and the second tubular member 37b. The second tubular member 37b and the inner tank projecting portion 32 may be configured integrally. The expandable member 37c is a member that can expand and contract in the projecting direction X. As shown in FIG. A bellows pipe, a corrugated pipe, a membrane, or the like, for example, may be used as the elastic member 37c.
　第３変形例に係る二重殻タンク２Ｃにおいて、熱収縮に起因して内槽本体３１が外槽４に対して相対変位すると、外槽４と接合されている内槽突出部３２は外槽４に拘束されることから内槽本体３１は内槽突出部３２に対して相対変位する。これにより、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７の主に伸縮部材３７ｃが突出方向Ｘへ伸長することによって、内槽３に過剰な負荷がかかることなく内槽本体３１と内槽突出部３２の連結が維持される。 In the double shell tank 2C according to the third modified example, when the inner tank main body 31 is relatively displaced with respect to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the projecting direction X is widened, but the extension of mainly the elastic member 37c of the connecting portion 37 in the projecting direction X causes an excessive load on the inner tank 3. Without this, the connection between the inner tank main body 31 and the inner tank projecting portion 32 is maintained.
＜第４変形例＞
　図８は、第４変形例に係る二重殻タンク２Ｄの頂部の概略断面図である。図８に示すように、第４変形例に係る二重殻タンク２Ｄは、内槽３と外槽４との間に中間槽６を備える点で前述の実施形態に係る二重殻タンク２と相違する。二重殻タンク２Ｄは、三層の槽を備える三重殻タンクともいえる。中間槽６は内槽３と外槽４との槽間に配置され、中間槽６に内槽３が収容され、外槽４に中間槽６が収容されている。内槽３と中間槽６は離間しており、これらの槽間に第１の保冷空間５２ａが形成されている。また、中間槽６と外槽４とは離間しており、これらの槽間に第２の保冷空間５２ｂが形成されている。 <Fourth modification>
FIG. 8 is a schematic cross-sectional view of the top of a double-shell tank 2D according to a fourth modification. As shown in FIG. 8, the double-shell tank 2D according to the fourth modification differs from the double-shell tank 2 according to the above-described embodiment in that an intermediate tank 6 is provided between the inner tank 3 and the outer tank 4. differ. The double-shell tank 2D can also be said to be a triple-shell tank having three layers of tanks. The intermediate tank 6 is arranged between the inner tank 3 and the outer tank 4 , the inner tank 3 is accommodated in the intermediate tank 6 , and the intermediate tank 6 is accommodated in the outer tank 4 . The inner tank 3 and the intermediate tank 6 are separated from each other, and a first cold insulation space 52a is formed between these tanks. Further, the intermediate tank 6 and the outer tank 4 are separated from each other, and a second cold insulation space 52b is formed between these tanks.
　内槽３は、内槽本体３１と、内槽突出部３２と、内槽本体３１と内槽突出部３２を連結する連結部３７を有する。連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、第１の筒部材３７ｂの上端に内周縁が接合された第１の環板部材３７ａ、第１の環板部材３７ａの外周縁に下端が接合された第２の筒部材３７ｂ、第２の筒部材３７ｂの上端に外周縁が接合された第２の環板部材３７ａ、第２の環板部材３７ａの内周縁に下端が接合された第３の筒部材３７ｂ、及び、第３の筒部材３７ｂの上端に内周縁が接合された第３の環板部材３７ａからなる。第３の環板部材３７ａの外周縁は、内槽突出部３２の内壁の上下中途部と接合されている。中間槽６の頂部には中間槽開口６６が設けられており、中間槽開口６６の開口縁と第２の筒部材３７ｂとが接合されている。外槽４の外槽開口４４は、内槽突出部３２の下端と接合されている。 The inner tank 3 has an inner tank main body 31 , an inner tank protruding portion 32 , and a connecting portion 37 that connects the inner tank main body 31 and the inner tank protruding portion 32 . The connecting portion 37 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, a first annular plate member 37a having an inner peripheral edge joined to the upper end of the first cylindrical member 37b, a first A second cylindrical member 37b whose lower end is joined to the outer peripheral edge of the ring plate member 37a, a second ring plate member 37a whose outer peripheral edge is joined to the upper end of the second cylindrical member 37b, and a second ring plate member It consists of a third tubular member 37b whose lower end is joined to the inner peripheral edge of the third tubular member 37a, and a third annular plate member 37a whose inner peripheral edge is joined to the upper end of the third tubular member 37b. The outer peripheral edge of the third ring plate member 37a is joined to the upper and lower middle portions of the inner wall of the inner tank projecting portion 32 . An intermediate tank opening 66 is provided at the top of the intermediate tank 6, and the opening edge of the intermediate tank opening 66 and the second cylindrical member 37b are joined. The outer tank opening 44 of the outer tank 4 is joined to the lower end of the inner tank projecting portion 32 .
　第４変形例に係る二重殻タンク２Ｄにおいて、熱収縮に起因して内槽本体３１及び中間槽６が外槽４に対して相対変位すると、外槽４と接合されている内槽突出部３２は外槽４に拘束されることから内槽本体３１及び中間槽６は内槽突出部３２に対して相対変位する。これにより、中間槽６と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７の主に第２及び第３の環板部材３７ａの変形により連結部３７が突出方向Ｘへ伸長することによって、中間槽６に過剰な負荷がかかることなく中間槽６と内槽突出部３２の連結が維持される。同様に、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７の主に第１～３の環板部材３７ａの変形により連結部３７が突出方向Ｘへ伸長することによって、内槽本体３１に過剰な負荷がかかることなく内槽本体３１と内槽突出部３２の連結が維持される。 In the double shell tank 2D according to the fourth modification, when the inner tank main body 31 and the intermediate tank 6 are displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding portion joined to the outer tank 4 Since 32 is restrained by outer tank 4 , inner tank main body 31 and intermediate tank 6 are displaced relative to inner tank projecting portion 32 . As a result, the distance between the intermediate tank 6 and the inner tank projecting portion 32 in the projecting direction X increases, but the connecting portion 37 extends in the projecting direction X mainly due to the deformation of the second and third ring plate members 37a of the connecting portion 37. By doing so, the connection between the intermediate tank 6 and the inner tank projecting portion 32 is maintained without an excessive load being applied to the intermediate tank 6 . Similarly, the distance between the inner tank main body 31 and the inner tank protruding portion 32 in the protruding direction X increases, but the connecting portion 37 extends in the protruding direction X mainly due to the deformation of the first to third ring plate members 37a of the connecting portion 37. By doing so, the connection between the inner tank main body 31 and the inner tank projecting portion 32 is maintained without excessive load being applied to the inner tank main body 31 .
＜第５変形例＞
　図９は、第５変形例に係る二重殻タンク２Ｅの頂部の概略断面図である。図９に示すように、第５変形例に係る二重殻タンク２Ｅは、内槽突出部３２がドーム形状ではなく平屋根形状を呈する点で、前述の実施形態に係る二重殻タンク２と相違する。内槽突出部３２の上方にタンクカバー１２は設けられておらず、内槽突出部３２は曝露されている。外槽４の外槽開口４４は、内槽突出部３２と剛接合されている。ここで、外槽４は内槽３の収容空間が形成されたものであればよく、船体１１から独立して内槽３を包囲する態様のもの、船体１１を利用して内槽３を包囲する態様のものなどであってもよい。つまり、外槽４は、タンクカバー１２や保持壁１４などの船体１１の一部により形成されていてもよい。 <Fifth Modification>
FIG. 9 is a schematic cross-sectional view of the top of a double-shell tank 2E according to the fifth modification. As shown in FIG. 9, the double-shell tank 2E according to the fifth modification differs from the double-shell tank 2 according to the above-described embodiment in that the inner tank projecting portion 32 has a flat roof shape instead of a dome shape. differ. The tank cover 12 is not provided above the inner tank protrusion 32, and the inner tank protrusion 32 is exposed. An outer tank opening 44 of the outer tank 4 is rigidly joined to the inner tank projecting portion 32 . Here, the outer tank 4 may have a space for accommodating the inner tank 3. The outer tank 4 may be one that surrounds the inner tank 3 independently from the hull 11, or one that surrounds the inner tank 3 using the hull 11. It may also be in a mode of doing so. That is, the outer tank 4 may be formed by a part of the hull 11 such as the tank cover 12 and the retaining wall 14 .
　内槽突出部３２は、連結部３７を介して内槽３と連結されている。連結部３７は、内槽本体３１の内槽開口３５に接合された第１の筒部材３７ｂ、第１の筒部材３７ｂの上端に内周縁が接合された環板部材３７ａ、及び、環板部材３７ａの外周縁に下端が接合された第２の筒部材３７ｂからなる。第２の筒部材３７ｂの上端は内槽突出部３２と接合されている。 The inner tank projecting portion 32 is connected to the inner tank 3 via a connecting portion 37 . The connecting portion 37 includes a first cylindrical member 37b joined to the inner tank opening 35 of the inner tank main body 31, a ring plate member 37a having an inner peripheral edge joined to the upper end of the first cylindrical member 37b, and a ring plate member. It consists of a second cylindrical member 37b whose lower end is joined to the outer peripheral edge of 37a. The upper end of the second cylindrical member 37b is joined to the inner tank projecting portion 32. As shown in FIG.
　第５変形例に係る二重殻タンク２Ｅにおいて、熱収縮に起因して内槽本体３１が外槽４に対して相対変位すると、外槽４と接合されている内槽突出部３２は外槽４に拘束されることから内槽本体３１は内槽突出部３２に対して相対変位する。これにより、内槽本体３１と内槽突出部３２の突出方向Ｘの間隔が広がるが、連結部３７の主に環板部材３７ａの変形により連結部３７が突出方向Ｘへ伸長することによって、内槽本体３１に過剰な負荷がかかることなく内槽本体３１と内槽突出部３２の連結が維持される。 In the double-shell tank 2E according to the fifth modification, when the inner tank main body 31 is displaced relative to the outer tank 4 due to heat shrinkage, the inner tank protruding part 32 joined to the outer tank 4 is 4, the inner tank main body 31 is relatively displaced with respect to the inner tank projecting portion 32. As shown in FIG. As a result, the distance between the inner tank main body 31 and the inner tank projecting portion 32 in the projecting direction X is widened. The connection between the inner tank main body 31 and the inner tank projecting portion 32 is maintained without excessive load being applied to the tank main body 31 .
〔総括〕
　以上に説明したように、本実施形態及びその第１～５変形例に係る二重殻タンク２，２Ａ～２Ｅは、
液化ガスを収容する内槽本体３１、内槽本体３１に配置された内槽開口３５よりも所定の突出方向Ｘへ突出した内槽突出部３２、及び、内槽開口３５の開口縁と内槽突出部３２とを連結する連結部３７とを有し、内槽本体３１、連結部３７、及び内槽突出部３２に囲まれた空間が内部に形成された内槽３と、
内槽本体３１を収容し、内槽突出部３２と接合された外槽４とを備え、
連結部３７が弾性変形により突出方向Ｘへ伸縮可能な伸縮構造（環板部材３７ａ又は伸縮部材３７ｃ）を有することを特徴としている。 [Summary]
As described above, the double shell tanks 2, 2A to 2E according to the present embodiment and its first to fifth modifications are
An inner tank main body 31 containing a liquefied gas, an inner tank projecting portion 32 projecting in a predetermined projecting direction X from an inner tank opening 35 arranged in the inner tank main body 31, and an opening edge of the inner tank opening 35 and the inner tank. an inner tank 3 having a connecting portion 37 that connects to the protruding portion 32 and having a space surrounded by the inner tank main body 31, the connecting portion 37, and the inner tank protruding portion 32 formed therein;
The outer tank 4 accommodates the inner tank main body 31 and is joined to the inner tank protrusion 32,
The connection part 37 is characterized by having an elastic structure (annular plate member 37a or an elastic member 37c) that can be expanded and contracted in the projecting direction X by elastic deformation.
　また、本実施形態に係る船舶１は、船体１１と、船体１１に支持された二重殻タンク２，２Ａ～２Ｅと備えることを特徴としている。 Further, the ship 1 according to the present embodiment is characterized by having a hull 11 and double- hull tanks 2, 2A to 2E supported by the hull 11.
　上記構成の二重殻タンク２，２Ａ～２Ｅ及びそれを備える船舶１では、内槽突出部３２は外槽４と接合され、内槽突出部３２は内槽本体３１と連結部３７を介して連結されている。そして、連結部３７が弾性変形により突出方向Ｘへ伸縮可能な伸縮構造を有することにより、内槽本体３１と外槽４との相対変位が生じても二重殻タンク２，２Ａ～２Ｅの構成要素に過剰な負荷がかからないように、内槽突出部３２に外槽４及び内槽本体３１の両方を構造的に連結できる。より詳細には、内槽本体３１と外槽４との相対変位により、内槽３及び外槽４、内槽３と外槽４を連結している構造部材、並びに、内槽突出部３２を貫通する配管（例えば、気送管９１や槽間配管９２）に、過剰な負荷がかからないように、内槽突出部３２に外槽４及び内槽本体３１の両方を構造的に連結できる。 In the double- shell tanks 2, 2A to 2E and the ship 1 including the same, the inner tank projecting portion 32 is joined to the outer tank 4, and the inner tank projecting portion 32 is connected to the inner tank main body 31 via the connecting portion 37. Concatenated. Since the connecting part 37 has a telescopic structure that can be expanded and contracted in the projecting direction X by elastic deformation, even if the inner tank main body 31 and the outer tank 4 are displaced relative to each other, the double shell tanks 2, 2A to 2E are constructed. Both the outer tub 4 and the inner tub body 31 can be structurally connected to the inner tub projection 32 so that the elements are not overstressed. More specifically, relative displacement between the inner tank main body 31 and the outer tank 4 causes the inner tank 3 and the outer tank 4, the structural members connecting the inner tank 3 and the outer tank 4, and the inner tank projecting portion 32 to move. Both the outer tank 4 and the inner tank main body 31 can be structurally connected to the inner tank projecting portion 32 so that excessive loads are not applied to the penetrating pipes (for example, the pneumatic pipe 91 and the inter-tank pipe 92).
　本実施形態及びその第１，２，４，５変形例に係る二重殻タンク２，２Ａ，２Ｂ，２Ｄ，２Ｅにおいて、連結部３７の伸縮構造は、突出方向Ｘを厚み方向とするリング状の環板部材３７ａを含む。この場合、連結部３７は、少なくとも１つの環板部材３７ａと、少なくとも１つの突出方向Ｘに延びる筒部材３７ｂとの組み合わせから構成されていてよい。 In the double- shell tanks 2, 2A, 2B, 2D, and 2E according to the present embodiment and its first, second, fourth, and fifth modifications, the elastic structure of the connecting portion 37 is a ring-shaped structure having the projecting direction X as the thickness direction. ring plate member 37a. In this case, the connecting portion 37 may be configured by a combination of at least one annular plate member 37a and at least one tubular member 37b extending in the projecting direction X. As shown in FIG.
　上記のような連結部３７の伸縮構造では、環板部材３７ａの内周縁と外周縁とが突出方向Ｘに互いに反対に引っ張られることによって、環板部材３７ａが突出方向Ｘに伸長する。このような環板部材３７ａの弾性変形によって、連結部３７を突出方向Ｘに伸長・短縮させることができる。また、環板部材３７ａは内槽本体３１と内槽突出部３２との間で荷重を伝達する構造部材として機能し、連結部３７で内槽本体３１又は内槽突出部３２を支持できる。 In the elastic structure of the connecting portion 37 as described above, the inner peripheral edge and the outer peripheral edge of the ring plate member 37a are pulled in the projecting direction X opposite to each other, so that the ring plate member 37a extends in the projecting direction X. The connecting portion 37 can be elongated or shortened in the projecting direction X by such elastic deformation of the ring plate member 37a. Further, the ring plate member 37 a functions as a structural member that transmits a load between the inner tank main body 31 and the inner tank protruding portion 32 , and the connecting portion 37 can support the inner tank main body 31 or the inner tank protruding portion 32 .
　また、本実施形態に係る二重殻タンク２では、内槽３の連結部３７は、内槽開口３５の開口縁と接合された第１端部（下端）と、内槽突出部３２の内壁と接合された第２端部（上端）とを有し、内槽突出部３２の内壁と連結部３７の外壁との間に、内槽本体３１と外槽４との間の保冷空間５２と連続する追加の保冷空間５２が形成されている。 In addition, in the double-shell tank 2 according to the present embodiment, the connecting portion 37 of the inner tank 3 includes the first end (lower end) joined to the opening edge of the inner tank opening 35 and the inner wall of the inner tank projecting portion 32 . and a second end (upper end) joined to and between the inner wall of the inner tank projecting portion 32 and the outer wall of the connecting portion 37, the cold insulation space 52 between the inner tank main body 31 and the outer tank 4 A continuous additional cold insulation space 52 is formed.
　上記の追加の保冷空間５２は、連結部３７内の保冷のために利用できる。また、追加の保冷空間５２は、内槽本体３１と外槽４との間を通る槽間配管９２を通すための空間として利用できる。この場合、槽間配管９２は、保冷空間５２と追加の保冷空間５２とを通され、内槽突出部３２のうち曝露された部分を貫通して外部へ延出されることが望ましい。これにより、槽間配管９２は、保冷空間５２のみを通されて、貯留空間５１や保持空間５３を通されずに曝露へ導出される。 The additional cold insulation space 52 can be used for cold insulation within the connecting portion 37 . Further, the additional cold insulation space 52 can be used as a space for passing an inter-tank pipe 92 passing between the inner tank main body 31 and the outer tank 4 . In this case, it is desirable that the inter-tank pipe 92 passes through the cold insulation space 52 and the additional cold insulation space 52, penetrates the exposed portion of the inner tank projecting portion 32, and extends to the outside. As a result, the inter-tank pipe 92 passes through only the cold insulation space 52 and is led out to the exposure without passing through the storage space 51 or the holding space 53 .
　また、第４変形例に係る二重殻タンク２Ｄでは、内槽本体３１と外槽４との間に内槽本体３１を収容した中間槽６が配置され、中間槽６は連結部３７が貫通する中間槽開口６６を有し、中間槽開口６６の開口縁と連結部３７とが接合されている。このように、本実施形態に係る二重殻タンク２の構造は、三槽以上の多重殻タンクにも適用可能である。 In addition, in the double-shell tank 2D according to the fourth modification, the intermediate tank 6 containing the inner tank body 31 is arranged between the inner tank body 31 and the outer tank 4, and the connecting part 37 penetrates the intermediate tank 6. The opening edge of the intermediate tank opening 66 and the connecting portion 37 are joined. Thus, the structure of the double shell tank 2 according to this embodiment can also be applied to a multi-shell tank with three or more tanks.
　また、第３変形例に係る二重殻タンク２Ｃでは、連結部３７の伸縮構造は、ベローズ管を含んでいる。このように、連結部３７の伸縮構造は、環板部材３７ａに限定されない。 In addition, in the double shell tank 2C according to the third modified example, the expansion structure of the connecting portion 37 includes a bellows pipe. Thus, the elastic structure of the connecting portion 37 is not limited to the ring plate member 37a.
　以上に本開示の好適な実施の形態を説明したが、本開示の趣旨を逸脱しない範囲で、上記実施形態の具体的な構造及び／又は機能の詳細を変更したものも本開示に含まれ得る。上記の構成は、例えば、以下のように変更することができる。 Although the preferred embodiments of the present disclosure have been described above, the present disclosure may also include changes in the details of the specific structures and/or functions of the above embodiments without departing from the spirit of the present disclosure. . For example, the above configuration can be modified as follows.
　例えば、上記実施形態に係る二重殻タンク２，２Ａ～２Ｅは、船体１１から独立した球形（又は方形）のタンクであるが、船体１１を利用したメンブレン型タンクであってもよい。この場合、上記実施形態において内槽３をメンブレン、外槽４を防壁又は船体と読み替えることによって、本開示をメンブレン型タンクに適用できる。 For example, the double shell tanks 2, 2A to 2E according to the above embodiment are spherical (or square) tanks independent of the hull 11, but they may be membrane tanks using the hull 11. In this case, the present disclosure can be applied to a membrane tank by replacing the inner tank 3 with a membrane and the outer tank 4 with a barrier or a hull in the above embodiment.
　例えば、上記実施形態に係る二重殻タンク２，２Ａ～２Ｅはカーゴタンクであるが、二重殻タンク２，２Ａ～２Ｅは必ずしも船舶１にカーゴタンクとして搭載される必要はなく、燃料タンクとして搭載されてもよい。また、船舶１に搭載される二重殻タンク２，２Ａ～２Ｅの数は特定されない。 For example, the double shell tanks 2, 2A to 2E according to the above embodiment are cargo tanks, but the double shell tanks 2, 2A to 2E do not necessarily need to be mounted on the ship 1 as cargo tanks, and can be used as fuel tanks. may be installed. Also, the number of double- shell tanks 2, 2A-2E mounted on the ship 1 is not specified.

Claims (8)

  1. 　液化ガスを収容する内槽本体、前記内槽本体に配置された内槽開口よりも所定の突出方向へ突出した内槽突出部、及び、前記内槽開口の開口縁と前記内槽突出部とを連結する連結部とを有し、前記内槽本体、前記連結部、及び前記内槽突出部に囲まれた空間が内部に形成された内槽と、
    　前記内槽本体を収容し、前記内槽突出部と接合された外槽とを備え、
    　前記連結部が弾性変形により前記突出方向へ伸縮可能な伸縮構造を有する、
    二重殻タンク。     an inner tank main body for containing a liquefied gas; an inner tank protruding part that protrudes in a predetermined protruding direction from an inner tank opening arranged in the inner tank main body; and an opening edge of the inner tank opening and the inner tank protruding part. an inner tank in which a space surrounded by the inner tank main body, the connecting part, and the inner tank protruding part is formed;
    An outer tank containing the inner tank main body and joined to the inner tank protrusion,
    The connection part has an elastic structure that can be expanded and contracted in the projecting direction by elastic deformation.
    double shell tank.
  2. 　前記伸縮構造は、前記突出方向を厚み方向とするリング状の環板部材を含む、
    請求項１に記載の二重殻タンク。     The elastic structure includes a ring-shaped ring plate member whose thickness direction is the projecting direction,
    Double shell tank according to claim 1.
  3. 　前記連結部は、少なくとも１つの前記環板部材と、少なくとも１つの前記突出方向に延びる筒部材との組み合わせからなる、
    請求項２に記載の二重殻タンク。     The connecting portion is composed of a combination of at least one ring plate member and at least one cylindrical member extending in the projecting direction,
    Double shell tank according to claim 2.
  4. 　前記連結部は、前記内槽開口の開口縁と接合された第１端部と、前記内槽突出部の内壁と接合された第２端部とを有し、
    　前記内槽突出部の内壁と前記連結部の外壁との間に、前記内槽本体と前記外槽との間の保冷空間と連続する追加の保冷空間が形成されている、
    請求項１～３のいずれか一項に記載の二重殻タンク。     The connecting portion has a first end joined to the opening edge of the inner tank opening and a second end joined to the inner wall of the inner tank protrusion,
    An additional cold insulation space is formed between the inner wall of the inner tank projecting portion and the outer wall of the connecting portion, and is continuous with the cold insulation space between the inner tank main body and the outer tank.
    A double-hulled tank according to any one of claims 1-3.
  5. 　前記保冷空間と前記追加の保冷空間とを通され、前記内槽突出部のうち曝露された部分を貫通して外部へ延出された槽間配管を、更に備える、
    請求項４に記載の二重殻タンク。     further comprising an inter-tank pipe that passes through the cold insulation space and the additional cold insulation space and extends to the outside through the exposed portion of the inner tank protrusion,
    Double shell tank according to claim 4.
  6. 　前記内槽本体と前記外槽との間に前記内槽本体を収容した中間槽が配置され、
    　前記中間槽は前記連結部が貫通する中間槽開口を有し、前記中間槽開口の開口縁と前記連結部とが接合されている、
    請求項１～５のいずれか一項に記載の二重殻タンク。     An intermediate tank containing the inner tank body is arranged between the inner tank body and the outer tank,
    The intermediate tank has an intermediate tank opening through which the connecting part penetrates, and the opening edge of the intermediate tank opening and the connecting part are joined,
    A double-hulled tank according to any one of claims 1-5.
  7. 　前記伸縮構造は、ベローズ管を含む、
    請求項１に記載の二重殻タンク。     The telescopic structure includes a bellows tube,
    Double shell tank according to claim 1.
  8. 　船体と、
    　前記船体に支持された請求項１～７のいずれか一項に記載の二重殻タンクとを備えた、船舶。     a hull;
    A ship comprising a double-hulled tank according to any one of claims 1 to 7 supported by said hull.
PCT/JP2022/015826 2021-03-31 2022-03-30 Double-hull tank and vessel WO2022210836A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5997397A (en) * 1982-11-26 1984-06-05 Kawaju Koji Kk Double shell low temperature tank insulation material re-filling method and device
JP2015004382A (en) * 2013-06-19 2015-01-08 川崎重工業株式会社 Double shell tank and liquefied gas carrying vessel
JP2015004383A (en) * 2013-06-19 2015-01-08 川崎重工業株式会社 Double shell tank and liquefied gas carrying vessel
JP2017194166A (en) * 2013-06-21 2017-10-26 川崎重工業株式会社 Liquefied gas retention tank and liquefied gas carrying vessel
JP2019157868A (en) * 2018-03-07 2019-09-19 川崎重工業株式会社 Liquefied gas tank
JP2020104787A (en) * 2018-12-28 2020-07-09 川崎重工業株式会社 Vessel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5997397A (en) * 1982-11-26 1984-06-05 Kawaju Koji Kk Double shell low temperature tank insulation material re-filling method and device
JP2015004382A (en) * 2013-06-19 2015-01-08 川崎重工業株式会社 Double shell tank and liquefied gas carrying vessel
JP2015004383A (en) * 2013-06-19 2015-01-08 川崎重工業株式会社 Double shell tank and liquefied gas carrying vessel
JP2017194166A (en) * 2013-06-21 2017-10-26 川崎重工業株式会社 Liquefied gas retention tank and liquefied gas carrying vessel
JP2019157868A (en) * 2018-03-07 2019-09-19 川崎重工業株式会社 Liquefied gas tank
JP2020104787A (en) * 2018-12-28 2020-07-09 川崎重工業株式会社 Vessel

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