WO2023079644A1

WO2023079644A1 - Tank and ship

Info

Publication number: WO2023079644A1
Application number: PCT/JP2021/040635
Authority: WO
Inventors: 亨尚渡部; 龍祐高田
Original assignee: 三菱造船株式会社
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2023-05-11
Also published as: KR20240044471A; EP4389583A1; CN117916151A

Abstract

This tank comprises a tank body, a pair of annular members, a cylindrical member, a partition wall, and a plurality of ribs. The tank body has a cylindrical portion extending in the horizontal direction. The pair of annular members are longitudinally spaced apart on the inner side of the cylindrical portion in the radial direction. The annular members are circumferentially continuous along the inner wall surface of the cylindrical portion and fixed to the inner wall surface. The cylindrical member is disposed radially inward of the pair of annular members and has a cylindrical shape extending in the longitudinal direction. The partition wall is disposed radially inward of the cylindrical member and closes at least a portion of the inside of the cylindrical member in the radial direction. The outer periphery of the partition wall is joined to the cylindrical member. The plurality of ribs extend along the partition wall surface facing one longitudinal side of the partition wall and are fixed to the partition wall surface.

Description

tanks, ships

This disclosure relates to tanks and ships.

Patent Literature 1 discloses a ship equipped with a horizontally arranged substantially cylindrical tank (hereinafter simply referred to as a cylindrical tank). When a liquid is stored in such a cylindrical tank, the liquid in the cylindrical tank oscillates due to the rocking of the ship. For example, the so-called sloshing, in which the liquid oscillates in the cylindrical tank in the longitudinal direction, can exert a large amount of pressure on the cylindrical tank and the members provided in the cylindrical tank, which can have an adverse effect. be. Therefore, a partition wall is arranged in the cylindrical tank so as to extend along a plane intersecting the longitudinal direction of the cylindrical tank.
In Patent Document 1, in a cylindrical tank, there are two partitions (circular porous partitions) adjacent to each other, and a frame structure of cross reinforcements disposed between the two partitions and welded to the two partitions. and a configuration is disclosed. In this configuration, the outer peripheral portion of the circular porous partition is welded to the inner peripheral surface of the tank.

Japanese Patent Publication No. 2009-541118

However, the partition wall of the cylindrical tank as described in Patent Document 1 has its outer peripheral portion joined to the inner peripheral surface of the cylindrical tank by welding. If too much pressure is applied, the weld between the bulkhead and the tank or the tank itself may be damaged.

The present disclosure has been made to solve the above problems, and it is possible to suppress the influence on the junction between the partition and the tank and the tank itself even when excessive pressure acts on the partition. The purpose is to provide suitable tanks and ships.

In order to solve the above problems, the tank according to the present disclosure includes a tank body, a pair of annular members, a tubular member, a partition wall, and a plurality of ribs. The tank body has a cylindrical portion extending in the horizontal direction as its longitudinal direction. The pair of annular members are arranged radially inside the tubular portion with a space therebetween in the longitudinal direction. The pair of annular members are circumferentially continuous along the inner wall surface of the cylindrical portion. The pair of annular members are fixed to the inner wall surface. The cylindrical member is arranged radially inside the pair of annular members. The tubular member has a tubular shape extending in the longitudinal direction. The tubular member connects inner peripheral edge portions of the pair of annular members. The partition wall is arranged radially inside the cylindrical member. The partition wall closes at least a portion of the radially inner side of the cylindrical member. An outer peripheral portion of the partition wall is joined to the cylindrical member. The plurality of ribs extend along a partition wall surface facing one side of the partition wall in the longitudinal direction. The plurality of ribs are fixed to the bulkhead surface.

A vessel according to the present disclosure is equipped with a tank as described above.

According to the tank and ship of the present disclosure, even if excessive pressure acts on the bulkhead, it is possible to suppress the impact on the junction between the bulkhead and the tank and the tank itself.

1 is a plan view showing a schematic configuration of a ship provided with tanks according to an embodiment of the present disclosure; FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; FIG. 4 is a perspective view showing a water control bulkhead provided in a tank according to an embodiment of the present disclosure; It is a sectional view of the above-mentioned water control partition. It is the figure which looked at the said water control partition from one side of the longitudinal direction. FIG. 5 is a diagram schematically showing a case where pressure acts on the water control partition wall from one side to the other side in the longitudinal direction; FIG. 4 is a diagram schematically showing a case where pressure acts on the water control partition wall from the other side to one side in the longitudinal direction;

Hereinafter, tanks and vessels according to embodiments of the present disclosure will be described with reference to FIGS. 1 to 7. FIG.
(Vessel configuration)
As shown in FIG. 1, a vessel 1 in an embodiment of the present disclosure carries liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). This ship 1 includes at least a hull 2 and a tank 10 .

(Hull configuration)
The hull 2 has a pair of sides 3A and 3B forming its outer shell, a ship bottom (not shown), and an upper deck 5. As shown in FIG. The shipboard sides 3A, 3B have a pair of shipboard skins forming the port and port sides, respectively. A ship bottom (not shown) has a ship bottom shell plate connecting these sides 3A and 3B. The pair of sides 3A and 3B and the bottom (not shown) form a U-shaped outer shell of the hull 2 in a cross section orthogonal to the fore-and-aft direction Da. The upper deck 5 is, for example, a through deck exposed to the outside. In the hull 2, an upper structure 7 having a living space is formed on the upper deck 5 on the stern 2b side. The hull 2 exemplified in this embodiment has a tank loading section (hold) 8 between the upper deck 5 on the bow 2a side of the superstructure 7 and the bottom of the hull (in other words, inside the hull 2).

(Construction of tank)
A plurality of tanks 10 are arranged in the tank mounting section 8 . In this embodiment, the plurality of tanks 10 arranged in the tank loading section 8 are arranged at intervals in the fore-and-aft direction Da.

As shown in FIG. 2 , the tank 10 includes a tank body 11 and a water control partition wall 20 .
The tank main body 11 accommodates the liquefied gas L therein. The tank body 11 includes a tubular portion 12 and a spherical end portion 13 . The tubular portion 12 extends in the horizontal direction as the longitudinal direction Dx. In the present embodiment, the tubular portion 12 is formed in a cylindrical shape having a cross-sectional shape orthogonal to the longitudinal direction Dx (in other words, a cross-sectional shape cut along a vertical plane extending in the width direction of the ship) that forms a constant circle in the longitudinal direction Dx. It is In this embodiment, the longitudinal direction Dx of the tank 10 (cylindrical portion 12) coincides with the bow-stern direction Da. The end spherical portions 13 are arranged at both ends of the tubular portion 12 in the longitudinal direction Dx. Each of these end spherical portions 13 has a hemispherical shape. In other words, these spherical end portions 13 are formed so as to gradually decrease in diameter toward the outside in the longitudinal direction Dx in a cross-sectional view orthogonal to the longitudinal direction Dx. The end spherical portions 13 block the openings at both ends of the cylindrical portion 12 in the fore-and-aft direction Da.

(Configuration of water control bulkhead)
The water control partition wall 20 is arranged, for example, in an intermediate portion of the cylindrical portion 12 in the longitudinal direction Dx.
Although FIG. 2 illustrates the case where only one water control partition 20 is provided, a plurality of water control partitions 20 may be arranged in the tubular portion 12 at intervals in the longitudinal direction Dx. .

As shown in FIGS. 3 to 5, the water control partition wall 20 includes a pair of

annular members

21 and 22, a tubular member 23, a partition wall 25, a plurality of ribs 27, and an outer peripheral member 29. .

The pair of

annular members

21 and 22 are arranged inside the tubular portion 12 described above in the radial direction Dr. The pair of

annular members

21 and 22 are arranged with a gap in the longitudinal direction Dx. The pair of

annular members

21 and 22 are continuous in the circumferential direction Dc along the inner wall surface 12w of the tubular portion 12, respectively. The pair of

annular members

21 and 22 each form an annular shape when viewed in the longitudinal direction Dx. The pair of

annular members

21 and 22 are formed in a plate shape having front and back surfaces perpendicular to (crossing) the longitudinal direction Dx. The pair of

annular members

21 and 22 are fixed to the inner wall surface 12w of the cylindrical portion 12 by welding. Although the annular member 21 and the annular member 22 in this embodiment have the same shape, they are not limited to this.

The cylindrical member 23 is arranged inside the pair of

annular members

21 and 22 in the radial direction Dr. The tubular member 23 has a tubular shape extending in the longitudinal direction Dx. The tubular member 23 connects the inner

peripheral edges

21a and 22a of the pair of annular members 21 and 22 (see FIG. 4). In this embodiment, the tubular member 23 slightly protrudes to both sides in the longitudinal direction Dx with respect to the pair of

annular members

21 and 22 .

The partition wall 25 prevents the liquefied gas L contained in the tank body 11 from moving in the longitudinal direction Dx. The partition wall 25 is arranged inside the cylindrical member 23 in the radial direction Dr. The outer edge of the partition wall 25 is welded to the cylindrical member 23 . The partition wall 25 blocks at least part of the space inside the cylindrical member 23 in the radial direction Dr. Here, the partition wall 25 may block the entire inside of the cylindrical member 23 in the radial direction Dr. The partition wall 25 in this case has a disc shape when viewed from the longitudinal direction Dx so as to block the entire circular space inside the tubular member 23 in the radial direction Dr. The partition 25 in this embodiment is formed with openings and slits (not shown) that communicate with both sides in the longitudinal direction Dx so as to allow the liquefied gas L to flow on both sides of the partition 25.

The partition wall 25 is arranged at a position overlapping in the longitudinal direction Dx with the annular member 22 arranged on the other side in the longitudinal direction Dx among the pair of

annular members

21 and 22 . In other words, the partition 25 and the annular member 22 are arranged on the same vertical plane. The thickness of the partition wall 25 in the longitudinal direction Dx in this embodiment is equal to or slightly thinner than the thickness of the

annular members

21 and 22 in the longitudinal direction Dx.

The plurality of ribs 27 reinforce the partition wall 25, and when the liquefied gas L oscillates in the tank body 11 in the longitudinal direction Dx, the pressure in the longitudinal direction Dx acting from the liquefied gas L causes the partition wall 25 to bend and deform. suppress. The plurality of ribs 27 extend along the partition surface 25f of the partition 25 facing one side in the longitudinal direction Dx. The plurality of ribs 27 are fixed to the partition wall surface 25f by welding. Furthermore, both ends of the plurality of ribs 27 are fixed to the inner peripheral surface of the cylindrical member 23 by welding.

The plurality of ribs 27 in this embodiment extend in the vertical direction Dz. The plurality of ribs 27 are spaced apart from each other in the tank width direction Dy along the partition wall surface 25f. In this embodiment, each rib 27 has a T-shaped cross-sectional shape perpendicular to its extending direction (vertical direction Dz).

Each rib 27 integrally has a web 27a and a flange 27b. The web 27a has a plate shape orthogonal to the partition wall surface 25f and continuously extends in the vertical direction Dz. This web 27a is joined to the partition wall surface 25f of the partition wall 25 by welding. The dimension of the web 27a in the longitudinal direction Dx of this embodiment is equal to the distance in the longitudinal direction Dx between the

annular members

21 and 22 .

The flange 27b is formed at the edge of the web 27a opposite to the partition wall surface 25f in the longitudinal direction Dx. The flange 27b has a plate shape parallel to the partition wall surface 25f and extends continuously in the vertical direction Dz. Here, the thickness of the flange 27b in the longitudinal direction Dx of this embodiment is equal to the thickness of the

annular members

21 and 22. As shown in FIG. In this embodiment, the web 27a is formed in a band shape with a constant width, but the web 27a is not limited to a constant width.

The rib 27 and the annular member 21 arranged on one side of the pair of

annular members

21 and 22 in the longitudinal direction Dx are arranged at positions overlapping each other in the longitudinal direction Dx. In this embodiment, the flange 27b of the rib 27 and the annular member 21 are arranged in the same plane.

The outer peripheral member 29 is arranged outside the rib 27 in the radial direction Dr with the tubular member 23 interposed therebetween. The outer peripheral member 29 is arranged on both sides of the tubular member 23 in the vertical direction Dz. The outer peripheral member 29 has a plate shape along a plane orthogonal to the tank width direction Dy (see FIG. 5). For example, the thickness of the peripheral member 29 can be the same as the thickness of the webs 27a of the ribs 27. FIG.

The outer peripheral member 29 is welded to the tubular member 23 and the pair of

annular members

21 and 22, respectively. One end 29r (see FIG. 4) of the outer peripheral member 29 in the longitudinal direction Dx is arranged at the same position as the outer peripheral end 21s of the annular member 21 in the radial direction Dr. Similarly, an end portion 29s on the other side in the longitudinal direction Dx of the outer peripheral member 29 is arranged at the same position as the outer peripheral end 22s of the annular member 22 in the radial direction Dr.

A recessed portion 29p is formed in the outer peripheral member 29 . The recessed portion 29p is formed in a curved shape recessed inward in the radial direction Dr with respect to the

end portions

29r and 29s. As a result, in the portion of the outer peripheral member 29 where the concave portion 29p is formed, the cross-sectional area of the cross section intersecting the radial direction Dr gradually decreases from the inside toward the outside in the radial direction Dr. Outer ends 29 r and 29 s of the outer peripheral member 29 in the radial direction Dr are not joined to the inner wall surface 12 w of the tank body 11 .

As shown in FIG. 6, the water control partition wall 20 is such that the partition wall 25 and the plurality of ribs 27 are bent by a pressure P1 (indicated by arrows in FIG. 6) directed from the other side to the one side in the longitudinal direction Dx. When deformed, the annular member 21 positioned on one side in the longitudinal direction Dx of the pair of

annular members

21 and 22 is subjected to a force (couple of forces) F11 (in FIG. 6) in a direction pulling the annular member 21 in the vertical direction Dz. , indicated by arrows). Due to this force F11, the annular member 21 positioned on one side in the longitudinal direction Dx is elastically deformed so as to expand in the vertical direction Dz.

On the other hand, on the annular member 22 located on the other side in the longitudinal direction Dx, a force (couple of force) F12 (indicated by an arrow in FIG. 6) acts in a direction to compress the annular member 22 in the vertical direction Dz. Due to this force F12, the annular member 22 located on the other side in the longitudinal direction Dx is elastically deformed so as to be crushed in the vertical direction Dz.

Further, for example, as shown in FIG. 7, when the partition walls 25 and the plurality of ribs 27 are flexurally deformed by pressure P2 (indicated by arrows in FIG. 7) directed from one side to the other side in the longitudinal direction Dx, A force (couple of force) F21 (indicated by an arrow in FIG. 7) acts on the annular member 21 located on one side in a direction to compress the annular member 21 in the vertical direction Dz. Due to this force F21, the annular member 21 located on one side in the longitudinal direction Dx is elastically deformed so as to be crushed in the vertical direction Dz.

In addition, a force (couple of force) F22 (indicated by an arrow in FIG. 7) acts on the annular member 22 located on the other side in the longitudinal direction Dx in a direction that pulls the annular member 22 in the vertical direction Dz. Due to this force F22, the annular member 22 positioned on the other side in the longitudinal direction Dx is elastically deformed so as to expand in the vertical direction Dz.

(Effect)
In the tank 10 of this embodiment, a pair of

annular members

21 and 22 and a tubular member 23 are provided between the partition wall 25 and the plurality of ribs 27 and the inner wall surface 12w of the tubular portion 12 of the tank body 11. ing.
According to the above embodiment, when the fluid in the tank 10 swings in the longitudinal direction Dx, the pressures P1 and P2 in the longitudinal direction Dx act on the partition wall 25 . The partition walls 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 in the longitudinal direction Dx. As the partition wall 25 and the plurality of ribs 27 are deformed, the

annular members

21 and 22 are elastically deformed so as to expand or collapse in the vertical direction Dz via the cylindrical member 23 . In other words, the bending moment of the ends of the partition wall 25 and the plurality of ribs 27 is transmitted as a couple of force to the

annular members

21 and 22, and the

annular members

21 and 22 are elastically deformed in the vertical direction Dz (radial direction Dr).

Therefore, the stress caused by the elastic deformation of the

annular members

21 and 22 in the vertical direction acts on the tank body 11 , and as a result, when the partition wall 25 and the plurality of ribs 27 are directly fixed to the tank body 11 , Thus, local stress generation in the vicinity of the fixed portion can be suppressed.
Therefore, even if excessive pressure acts on the partition wall 25, it is possible to suppress the influence on the junction between the water control partition wall 20 and the tank 10 and the tank 10 itself.

In the above embodiment, the outer peripheral member 29 is arranged outside the rib 27 in the radial direction Dr with the tubular member 23 interposed therebetween, and is joined to the tubular member 23 and the pair of

annular members

21 and 22. there is
Accordingly, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 in the longitudinal direction Dx acting on the partition 25, the peripheral member 29 can receive part of the force couple generated on the

annular members

21 and 22. can. Therefore, deformation of the tubular member 23 and the

annular members

21 and 22 can be suppressed. In addition, the outer peripheral member 29 can prevent the

annular members

21 and 22 from deforming in the directions of separating from each other and approaching each other. Therefore, the stress generated in the connecting portion between the

annular members

21 and 22 and the tubular member 23 can be reduced.

Further, in the above embodiment, the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank body 11 .
Accordingly, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 in the longitudinal direction Dx acting on the partition 25, an external force acts on the outer peripheral member 29 from each rib 27 via the cylindrical member 23. Also, since the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank main body 11, the occurrence of stress between the outer peripheral member 29 and the tank main body 11 can be suppressed.
Moreover, normally, stress acts on the tank main body 11 of the tank 10 in the circumferential direction Dc due to the internal pressure. For example, when the outer peripheral member 29 is joined to the inner wall surface 12w, the joined portion becomes a stress concentrated portion that increases the stress acting on the tank body 11 in the circumferential direction Dc. However, since the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank body 11, the increase in stress can be suppressed.

In the above-described embodiment, the cross-sectional area of the outer peripheral member 29 in the cross section intersecting the radial direction Dr gradually decreases from the inside to the outside in the radial direction Dr.
As a result, when the partition 25 and the plurality of ribs 27 are deformed by pressure acting on the partition 25 in the longitudinal direction Dx, it is possible to prevent the outer peripheral member 29 from contacting the tank body 11 and causing stress concentration. Furthermore, when the partition wall 25 and the plurality of ribs 27 are deformed by pressures P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, the

annular members

21 and 22 are elastically deformed in the vertical direction Dz (radial direction Dr). It is possible to suppress obstruction by the member 29 . Further, by gradually reducing the cross-sectional area of the outer peripheral member 29, the rigidity of the outer peripheral member 29 can be gradually reduced, so that stress concentration due to a sudden reduction in rigidity can be avoided.

In the above embodiment, the partition wall 25 is further arranged at a position overlapping the annular member 22 in the longitudinal direction Dx.
Thereby, when the partition 25 is deformed by the pressures P1 and P2 in the longitudinal direction Dx, the bending moment of the partition 25 is transmitted more efficiently as a couple of the annular member 22 arranged on the other side in the longitudinal direction Dx. be able to.

Further, in the above embodiment, the rib 27 is arranged at a position overlapping the annular member 21 in the longitudinal direction Dx. Further, in the above embodiment, the flange 27b of the rib 27 is arranged at a position overlapping the annular member 21 in the longitudinal direction Dx.
Accordingly, when the plurality of ribs 27 are deformed together with the partition wall 25 by the pressures P1 and P2 in the longitudinal direction Dx, the bending moment of the plurality of ribs 27 is transferred to the couple of forces of the annular member 21 arranged on one side in the longitudinal direction Dx. , can be transmitted more efficiently. In addition, since the flange 27b of the rib 27 is arranged at a position overlapping with the annular member 21 in the longitudinal direction Dx, the bending moment of the plurality of ribs 27 is applied to the joint of the annular member 21 arranged on one side in the longitudinal direction Dx. As power, it can be transmitted more efficiently.

Further, in the above embodiment, the

annular members

21 and 22 are plate-like and intersect with the longitudinal direction Dx.
As a result, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 acting on the partition 25 in the longitudinal direction Dx, the

annular members

21 and 22 can be elastically deformed in the radial direction Dr. can.

And the ship 1 of the said embodiment is equipped with the tank 10 which was described above.
Therefore, even if excessive pressures P1 and P2 act on the partition wall 25, the joint between the partition wall 25 and the tank 10 and the tank 10 itself can be prevented from being affected.

(Other embodiments)
As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and design changes and the like are included within the scope of the present disclosure. For example, in the above-described embodiment, the plurality of ribs 27 are configured to extend in the vertical direction Dz, but the configuration is not limited to this. For example, each rib 27 may extend in the tank width direction Dy. Furthermore, the ribs 27 may extend obliquely along the partition surface 25f. Also, the ribs 27 in the above-described embodiment are linear when viewed from the longitudinal direction Dx of the tank 10 . However, the ribs 27 may be slightly curved when viewed from the longitudinal direction Dx. Moreover, although the case where several ribs 27 were extended mutually parallel was illustrated, it is not restricted to this.

Also, the cross-sectional shape of each rib 27 is not limited to a T-shape having a web 27a and a flange 27b. The cross-sectional shape of each rib 27 may be L-shaped, I-shaped, H-shaped, or the like.

Also, in the above embodiment, the tank 10 has only one tank main body 11, but the present invention is not limited to this. The tank 10 may be of a multi-lobe type such as a so-called Bi-lobe type or Tri-lobe type, and may have a structure in which a plurality of tank bodies 11 extending in the longitudinal direction Dx are combined. In such a case, the cross-sectional shape of the tank body 11 is not limited to circular, and may be other shapes. In this case, the contour of the water control partition wall 20 may have a shape corresponding to the cross-sectional shape of the tank body 11 of the tank 10 such as a bi-lobe type or a tri-lobe type.

Furthermore, in the above-described embodiment, the tank 10 is arranged so that the longitudinal direction Dx of the cylindrical portion 12 is along the bow-stern direction Da, but this is not restrictive. The tank 10 may be arranged such that the longitudinal direction Dx of the cylindrical portion 12 is aligned with the ship width direction.
Moreover, in the above-described embodiment, the case where the tank 10 includes the end spherical portion 13 is exemplified. However, the shape of the ends of the tank 10 in the longitudinal direction is not limited to a hemispherical shape. Furthermore, the number and arrangement of the tanks 10 included in the ship 1 are not limited to those described above.

Also, in the above embodiment, the tank 10 contains the liquefied gas L, but the present invention is not limited to this. For example, the tank 10 may contain fuel and various liquids such as water.

Also, in the above embodiment, the tank 10 is provided on the ship 1, but the present invention is not limited to this. The use of the tank 10 is not limited to the use on ships, as long as the liquid contained therein oscillates. For example, it can be used for other applications such as offshore structures as appropriate.

<Appendix>
For example, the tank 10 and the ship 1 described in the embodiment are understood as follows.

(1) A tank 10 according to a first aspect includes a tank body 11 having a tubular portion 12 extending in a horizontal direction in a longitudinal direction Dx, and a tank main body 11 having a tubular portion 12 extending in the radial direction Dr of the tubular portion 12 at a distance in the longitudinal direction Dx. , are continuous in the circumferential direction Dc along the inner wall surface 12w of the cylindrical portion 12, and fixed to the inner wall surface 12w; 22, a cylindrical member 23 extending in the longitudinal direction Dx and connecting inner

peripheral edge portions

21a and 22a of the pair of

annular members

21 and 22; 23, a partition wall 25 that closes at least a part of the inner side of the tubular member 23 in the radial direction Dr and whose outer peripheral portion is joined to the tubular member 23; and a plurality of ribs 27 extending along a bulkhead surface 25f facing one side of the longitudinal direction Dx of and fixed to the bulkhead surface 25f.

According to this tank 10, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 in the longitudinal direction Dx acting on the partition 25, the bending moment of the rib 27 is transmitted as a couple of force to the

annular members

21 and 22. As a result, the

annular members

21 and 22 are elastically deformed in the radial direction Dr. Therefore, the stress associated with the elastic deformation of the

annular members

21 and 22 in the radial direction Dr acts on the tank body 11, and excessive stress is applied to the joint between the

annular members

21 and 22 and the inner wall surface 12w of the tank body 11. The occurrence of stress is suppressed. Therefore, even if excessive pressures P1 and P2 act on the partition wall 25, the joint between the partition wall 25 and the tank 10 and the tank 10 itself are less affected.

(2) A tank 10 according to a second aspect is the tank 10 of (1), and is arranged outside the rib 27 in the radial direction Dr with the tubular member 23 interposed therebetween. A member 23 and an outer peripheral member 29 joined to the pair of

annular members

21 and 22 are further provided.

Accordingly, when the partition wall 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, part of the force couple generated on the

annular members

21 and 22 can be received by the outer peripheral member 29. can. Thereby, deformation of the tubular member 23 and the

annular members

21 and 22 can be suppressed.

(3) A tank 10 according to a third aspect is the tank 10 of (1), in which the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank main body 11 .

Accordingly, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 in the longitudinal direction Dx acting on the partition 25, an external force acts on the outer peripheral member 29 from each rib 27 via the cylindrical member 23. Also, since the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank main body 11, the occurrence of stress between the outer peripheral member 29 and the tank main body 11 can be suppressed.
Moreover, normally, stress acts on the tank main body 11 of the tank 10 in the circumferential direction Dc due to the internal pressure. For example, when the outer peripheral member 29 is joined to the inner wall surface 12w, the joined portion becomes a stress concentrated portion that increases the stress acting on the tank body 11 in the circumferential direction Dc. However, since the outer peripheral member 29 is not joined to the inner wall surface 12w of the tank body 11, the increase in stress can be suppressed.

(4) A tank 10 according to a fourth aspect is the tank 10 of (3), wherein the outer peripheral member 29 extends from the inside to the outside in the radial direction Dr in a cross section intersecting the radial direction Dr. The cross-sectional area is gradually reduced.

Thus, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 acting on the partition 25 in the longitudinal direction Dx, the outer peripheral member 29 prevents the

annular members

21 and 22 from elastically deforming in the radial direction Dr. can be restrained.
Further, by gradually reducing the cross-sectional area of the outer peripheral member 29, the rigidity of the outer peripheral member 29 can be gradually reduced, so that stress concentration due to a sudden reduction in rigidity can be avoided.

(5) The tank 10 according to the fifth aspect is the tank 10 according to any one of (1) to (4), wherein the partition wall 25 is the longitudinal direction of the pair of

annular members

21 and 22. It is arranged at a position overlapping in the longitudinal direction Dx with the annular member 22 arranged on the other side of Dx.

As a result, when the partition 25 is deformed by the pressures P1 and P2 acting on the partition 25 in the longitudinal direction Dx, the bending moment of the partition 25 can be converted into a force couple of the annular member 22 arranged on the other side in the longitudinal direction Dx. can be transmitted efficiently.

(6) The tank 10 according to the sixth aspect is the tank 10 according to any one of (1) to (5), wherein the rib 27 is positioned between the pair of

annular members

21 and 22 in the longitudinal direction. It is arranged at a position overlapping with the annular member 21 arranged on one side of Dx in the longitudinal direction Dx.

As a result, when the plurality of ribs 27 are deformed together with the partition wall 25 by the pressures P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, the bending moment of the plurality of ribs 27 is transferred to the annular ring arranged on one side in the longitudinal direction Dx. As a couple of the members 21, the force can be transmitted more efficiently.

(7) A tank 10 according to a seventh aspect is the tank 10 according to any one of (1) to (6), wherein the

annular members

21 and 22 are plate-like and intersect with the longitudinal direction Dx. ing.

As a result, when the partition 25 and the plurality of ribs 27 are deformed by the pressures P1 and P2 acting on the partition 25 in the longitudinal direction Dx, the

annular members

21 and 22 can be elastically deformed in the radial direction Dr. can.

(8) The ship 1 according to the eighth aspect includes the tank 10 according to any one of (1) to (7).

As a result, even if excessive pressures P1 and P2 act on the partition wall 25, the joint between the partition wall 25 and the tank 10 and the tank 10 itself can be prevented from being affected. Therefore, damage to the tank 10 provided on the ship 1 can be suppressed, and the load on the maintenance of the ship 1 can be reduced.

1... Ship 2... Hull 2a... Bow 2b... Stern 3A, 3B... Broadside 4... Ship bottom 5... Upper deck 7... Superstructure 8... Tank loading section 10... Tank 11... Tank body 12... Cylindrical part 12 w... Inner wall surface 13 ... Spherical end part 20...

Water control partition

21, 22...

Annular member

21a, 22a... Inner

peripheral edge

21s, 22s... Outer peripheral end 23... Cylindrical member 25... Partition wall 25f... Partition wall surface 27... Rib 27a... Web 27b... Flange 29... Peripheral member 29p...

Concave part

29r, 29s... End part L... Liquefied gas

Claims

a tank body having a tubular portion extending in a horizontal direction as a longitudinal direction;
and a pair of annular members arranged radially inside the cylindrical portion with a gap in the longitudinal direction, continuous in the circumferential direction along the inner wall surface of the cylindrical portion, and fixed to the inner wall surface. ,
a tubular member arranged radially inside the pair of annular members, extending in the longitudinal direction and having a tubular shape that connects inner peripheral edge portions of the pair of annular members;
a partition disposed radially inside the tubular member, closing at least a part of the radial inside of the tubular member, and having an outer peripheral portion joined to the tubular member;
a plurality of ribs extending along a partition surface facing one of the longitudinal sides of the partition and fixed to the partition;
tank with
2. The tank according to claim 1, further comprising an outer peripheral member disposed outside the rib in the radial direction with the tubular member interposed therebetween and joined to the tubular member and the pair of annular members.
The outer peripheral member is not joined to the inner wall surface of the tank body,
3. Tank according to claim 2.
The tank according to claim 3, wherein the outer peripheral member has a cross-sectional area that gradually decreases from the inner side to the outer side in the radial direction in a cross section intersecting the radial direction.
5. The partition wall according to any one of claims 1 to 4, wherein the partition wall is arranged at a position overlapping in the longitudinal direction with the annular member arranged on the other side in the longitudinal direction of the pair of annular members. tank.
The rib according to any one of claims 1 to 5, wherein the rib is arranged at a position overlapping in the longitudinal direction with the annular member arranged on one side in the longitudinal direction of the pair of annular members. tank.
The tank according to any one of claims 1 to 6, wherein the annular member has a plate shape that intersects with the longitudinal direction.
A ship equipped with the tank according to any one of claims 1 to 7.