Storage tanks and ships

Abstract

The storage tank includes a storage tank main body, a pair of ring-shaped members, a cylindrical member, a partition, and a plurality of reinforcing ribs. The storage tank main body has a cylindrical portion extending in a horizontal direction. The pair of ring-shaped members are arranged at intervals in a length direction on an inner side of the cylindrical portion in a radial direction. The ring-shaped members are continuous in a circumferential direction along inner wall surfaces of the cylindrical portion, respectively, and are fixed to the inner wall surfaces. The cylindrical member is arranged on an inner side of the pair of ring-shaped members in the radial direction and has a cylindrical shape extending in the length direction. The partition is arranged on an inner side of the cylindrical member in the radial direction and closes at least a portion of the inner side of the cylindrical member in the radial direction. An outer peripheral portion of the partition is engaged with the cylindrical member. The plurality of reinforcing ribs extend along a partition surface on one side of the partition in the length direction toward the partition and are fixed to the partition surface.

Description

Technical Field

[0001] This invention relates to a storage tank and a ship. Background Technology

[0002] Patent Document 1 discloses a ship equipped with a horizontally arranged, generally cylindrical storage tank (hereinafter referred to as a cylindrical tank). When liquid is contained in this cylindrical tank, the liquid inside the tank sways due to the ship's rolling motion. For example, this so-called sloshing, caused by the liquid swaying along the length of the cylindrical tank, can exert significant pressure on the tank or components installed within it, potentially causing adverse effects. Therefore, partition walls are arranged within the cylindrical tank along surfaces intersecting the length of the tank.

[0003] Patent Document 1 discloses a skeleton structure comprising two adjacent partition walls (circular porous partition walls) and a cross-reinforcement component disposed between the two partition walls and welded to them, within a cylindrical storage tank. In this structure, the outer periphery of the circular porous partition wall is joined to the inner circumferential surface of the storage tank by welding.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2009-541118 Summary of the Invention

[0007] The technical problem to be solved by the invention

[0008] However, as described in Patent Document 1, the partition wall of the cylindrical storage tank joins its outer periphery to the inner periphery of the cylindrical storage tank by welding. Therefore, when excessive pressure from the liquid inside the cylindrical storage tank is applied to the partition wall, there is a possibility that the weld between the partition wall and the storage tank or the storage tank itself may be damaged.

[0009] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a storage tank and a ship that can suppress the impact on the joint between the partition wall and the storage tank or the storage tank itself even when excessive pressure is applied to the partition wall.

[0010] means for solving technical problems

[0011] To address the aforementioned issues, the present invention relates to a storage tank comprising a tank body, a pair of annular components, a cylindrical component, a partition wall, and a plurality of reinforcing ribs. The tank body has a cylindrical portion extending in the horizontal direction. The pair of annular components are arranged at intervals along the length direction on the radially inner side of the cylindrical portion. The pair of annular components are continuous in the circumferential direction along the inner wall surface of the cylindrical portion. The pair of annular components are fixed to the inner wall surface. The cylindrical component is disposed on the radially inner side of the pair of annular components. The cylindrical component is cylindrical, extending along the length direction. The cylindrical component connects the inner peripheral edges of the pair of annular components to each other. The partition wall is disposed on the radially inner side of the cylindrical component. The partition wall closes at least a portion of the radially inner side of the cylindrical component. The outer peripheral portion of the partition wall engages with the cylindrical component. The plurality of reinforcing ribs extend along a partition wall surface on one side facing the length direction of the partition wall. The plurality of reinforcing ribs are fixed to the partition wall surface.

[0012] The ship involved in this invention is equipped with the storage tanks described above.

[0013] Invention Effects

[0014] The storage tank and vessel according to the present invention can suppress the impact on the joint between the partition wall and the storage tank or the storage tank itself, even when excessive pressure is applied to the partition wall. Attached Figure Description

[0015] Figure 1 This is a plan view showing the general structure of a ship equipped with the storage tanks according to embodiments of the present invention.

[0016] Figure 2 It is along Figure 1 Sectional view of the II-II line cut.

[0017] Figure 3 This is a perspective view showing the waterproof partition wall of the storage tank according to the embodiments of the present invention.

[0018] Figure 4 This is a cross-sectional view of the aforementioned waterproof partition wall.

[0019] Figure 5 This is a diagram showing the waterproof partition wall as viewed from one side along its length.

[0020] Figure 6 This diagram schematically illustrates the situation where pressure acts on the aforementioned waterproof partition from one side along the length direction to the other.

[0021] Figure 7 This diagram schematically illustrates the situation where pressure acts on the aforementioned waterproof partition wall from one side along its length to the other. Detailed Implementation

[0022] The following is for reference. Figures 1 to 7 The storage tanks and ships involved in the embodiments of the present invention will be described.

[0023] (Ship structure)

[0024] like Figure 1 As shown, the vessel 1 of this embodiment of the invention transports liquefied gases such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). The vessel 1 includes at least a hull 2 ​​and a storage tank 10.

[0025] (Structure of the ship's hull)

[0026] The hull 2 ​​has a pair of sidewalls 3A and 3B, a bottom (not shown), and an upper deck 5 that constitute its outer shell. Sidewalls 3A and 3B have a pair of sidewall platings forming the port and starboard sides, respectively. The bottom (not shown) has a bottom plating connecting these sidewalls 3A and 3B. Through these sidewalls 3A and 3B and the bottom (not shown), the outer shell of the hull 2 ​​is U-shaped in a cross-section orthogonal to the bow-stern direction Da. The upper deck 5 is, for example, a full-length deck exposed to the outside. In the hull 2, a superstructure 7 with a living area is formed on the upper deck 5 on the stern 2b side. In this embodiment, the hull 2 ​​has a tank-carrying area (cargo hold) 8 between the upper deck 5 and the bottom (in other words, within the hull 2) on the bow 2a side, which is closer to the superstructure 7 than the bow 2a side.

[0027] (Structure of the storage tank)

[0028] Multiple storage tanks 10 are arranged within the tank loading area 8. In this embodiment, the multiple storage tanks 10 arranged within the tank loading area 8 are spaced apart in the bow-stern direction Da.

[0029] like Figure 2 As shown, the storage tank 10 has a main body 11 and a waterproof partition 20.

[0030] The tank body 11 contains liquefied gas L. The tank body includes a cylindrical portion 12 and end spherical portions 13. The cylindrical portion 12 extends horizontally along its length direction Dx. In this embodiment, the cylindrical portion 12 is formed as a cylindrical shape with a cross-sectional shape orthogonal to the length direction Dx (in other words, a cross-sectional shape cut by a vertical plane extending along the ship's width direction) that is a constant circle along the length direction Dx. In this embodiment, the length direction Dx of the tank 10 (cylindrical portion 12) coincides with the bow-stern direction Da. The end spherical portions 13 are respectively disposed at both ends of the cylindrical portion 12 along the length direction Dx. These end spherical portions 13 are hemispherical. In other words, these end spherical portions 13 are formed such that, in a cross-sectional view orthogonal to the length direction Dx, they gradually narrow towards the outside of the length direction Dx. The end spherical portions 13 respectively close the openings at both ends of the cylindrical portion 12 in the bow-stern direction Da.

[0031] (Structure of waterproof partition)

[0032] Waterproof partition 20 is disposed, for example, in the middle part of the length direction Dx of the cylindrical part 12.

[0033] In addition, Figure 2 The example shown illustrates the case where only one waterproof partition 20 is provided, but multiple waterproof partitions 20 can be arranged at intervals along the length direction Dx within the cylindrical portion 12.

[0034] like Figures 3-5 As shown, the waterproof partition 20 includes a pair of annular components 21 and 22, a cylindrical component 23, a partition 25, multiple reinforcing ribs 27, and an outer peripheral component 29.

[0035] A pair of annular components 21 and 22 are disposed on the radial inner side of the cylindrical portion 12. The pair of annular components 21 and 22 are spaced apart along the length direction Dx. The pair of annular components 21 and 22 are continuous along the inner wall surface 12w of the cylindrical portion 12 in the circumferential direction Dc. The pair of annular components 21 and 22 are circular when viewed from the length direction Dx. The pair of annular components 21 and 22 are formed as plates having a front surface and a back surface orthogonal (intersecting) to the length direction Dx. The pair of annular components 21 and 22 are fixed to the inner wall surface 12w of the cylindrical portion 12 by welding. The annular components 21 and 22 in this embodiment illustrate the same shape, but are not limited to this.

[0036] A cylindrical member 23 is disposed inside the radial direction Dr of a pair of annular members 21 and 22. The cylindrical member 23 is cylindrical, extending along the length direction Dx. The cylindrical member 23 connects the inner peripheral edges 21a and 22a of the pair of annular members 21 and 22 to each other (see reference). Figure 4 In this embodiment, the cylindrical member 23 protrudes slightly on both sides of the pair of annular members 21, 22 in the length direction Dx.

[0037] The partition wall 25 inhibits the movement of liquefied gas L contained within the tank body 11 in the longitudinal direction Dx. The partition wall 25 is disposed on the radially inner side of the cylindrical member 23. The outer edge of the partition wall 25 is joined to the cylindrical member 23 by welding. The partition wall 25 closes at least a portion of the space on the radially inner side of the cylindrical member 23. Here, the partition wall 25 can close the entire radially inner side of the cylindrical member 23. In this case, the partition wall 25 is circular when viewed from the longitudinal direction Dx, thus closing the entire circular space on the radially inner side of the cylindrical member 23. In this embodiment, the partition wall 25 has openings or slits (not shown) communicating with both sides in the longitudinal direction Dx, and is configured to allow liquefied gas L to pass through both sides separated by the partition wall 25.

[0038] The partition wall 25 is positioned in the longitudinal direction Dx, overlapping with one of the pair of annular members 21 and 22, which is positioned on the other side of the longitudinal direction Dx. In other words, the partition wall 25 and the annular member 22 are disposed together on the same vertical plane. In this embodiment, the thickness of the partition wall 25 in the longitudinal direction Dx is equal to or slightly thinner than the thickness of the annular members 21 and 22 in the longitudinal direction Dx.

[0039] Multiple reinforcing ribs 27 reinforce the partition wall 25 and suppress the deflection deformation of the partition wall 25 caused by the pressure exerted by the liquefied gas L in the length direction Dx when it swings within the tank body 11. The multiple reinforcing ribs 27 extend along the partition wall surface 25f of the partition wall 25 on the side facing the length direction Dx. The multiple reinforcing ribs 27 are respectively fixed to the partition wall surface 25f by welding. Furthermore, the two ends of the multiple reinforcing ribs 27 are respectively fixed to the inner circumferential surface of the cylindrical component 23 by welding.

[0040] In this embodiment, a plurality of reinforcing ribs 27 extend along the vertical direction Dz. The plurality of reinforcing ribs 27 are spaced apart from each other along the tank width direction Dy along the partition wall surface 25f. In this embodiment, the cross-sectional shape of each reinforcing rib 27 orthogonal to its extending direction (vertical direction Dz) is T-shaped.

[0041] Each reinforcing rib 27 integrally has a web 27a and a flange 27b. The web 27a is plate-shaped and extends continuously in the vertical direction Dz, orthogonal to the partition wall surface 25f. The web 27a is joined to the partition wall surface 25f of the partition wall 25 by welding. In this embodiment, the dimension of the web 27a in the longitudinal direction Dx is equal to the distance in the longitudinal direction Dx between the annular member 21 and the annular member 22.

[0042] A flange 27b is formed on the edge of the web 27a on the side opposite to the partition surface 25f in the longitudinal direction Dx. The flange 27b is plate-shaped and extends continuously in the vertical direction Dz, parallel to the partition surface 25f. Here, in this embodiment, the thickness of the flange 27b in the longitudinal direction Dx is equal to the thickness of the annular members 21 and 22. In addition, in this embodiment, the web 27a is illustrated as a strip with a constant width, but the web 27a is not limited to a constant width.

[0043] The aforementioned reinforcing rib 27 and one of the pair of annular members 21 and 22, which is disposed on one side of the length direction Dx, are positioned to overlap in the length direction Dx. In this embodiment, an example is shown where the flange 27b of the reinforcing rib 27 is disposed in the same plane as the annular member 21.

[0044] The outer peripheral component 29 is disposed radially outside the cylindrical component 23, relative to the reinforcing rib 27. The outer peripheral component 29 is disposed on both sides of the cylindrical component 23 in the vertical direction Dz. The outer peripheral component 29 is oriented along the width direction Dy of the tank (reference). Figure 5 A plate-like structure with orthogonal surfaces. For example, the thickness of the outer peripheral component 29 can be set to be equal to the thickness of the web 27a of the reinforcing rib 27.

[0045] The outer peripheral component 29 is joined to the cylindrical component 23 and a pair of annular components 21 and 22 by welding. The end 29r of the outer peripheral component 29 on one side along the length direction Dx (reference) Figure 4 The outer end 29s of the outer peripheral member 29 is positioned in the same position as the outer peripheral end 21s of the annular member 21 in the radial direction Dr. Similarly, the other end 29s of the outer peripheral member 29 in the longitudinal direction Dx is positioned in the same position as the outer peripheral end 22s of the annular member 22 in the radial direction Dr.

[0046] A recess 29p is formed on the outer peripheral component 29. This recess 29p is formed in a curved shape that is recessed radially inward relative to the ends 29r and 29s. As a result, the cross-sectional area of ​​the portion of the outer peripheral component 29 where the recess 29p is formed, intersecting with the radial direction Dr, gradually decreases from the inner side of the radial direction Dr towards the outer side. The ends 29r and 29s of the outer peripheral component 29 on the outer side of the radial direction Dr are not engaged with the inner wall surface 12w of the tank body 11.

[0047] like Figure 6 As shown, in this waterproof partition 20, for example, when the pressure P1 from the other side of the length direction Dx toward one side... Figure 6 In the middle, indicated by the arrow, when the partition wall 25 and multiple reinforcing ribs 27 are flexed and deformed, the force (couple) F11 that stretches the annular component 21 of the pair of annular components 21 and 22 in the vertical direction Dz is... Figure 6(In the image, indicated by the arrow) acts on the annular component 21 located on one side of the length direction Dx. Through this force F11, the annular component 21 located on one side of the length direction Dx elastically deforms in a manner that expands along the vertical direction Dz.

[0048] On the other hand, the force (couple) F12 that compresses the annular component 22 located on the other side of the length direction Dx along the vertical direction Dz Figure 6 (In the image, indicated by the arrow) acts on the annular component 22. Due to this force F12, the annular component 22 located on the other side of the length direction Dx elastically deforms in a crushing manner along the vertical direction Dz.

[0049] And, for example, such as Figure 7 As shown, when the pressure P2 (from one side of the length direction Dx towards the other side) Figure 7 In the diagram (indicated by the arrow), when the partition wall 25 and multiple reinforcing ribs 27 flex and deform, the force (couple) F21 that compresses the annular component 21 located on one side of the length direction Dx along the vertical direction Dz is (indicated by the arrow). Figure 7 (In the image, indicated by the arrow) acts on the annular component 21. Due to this force F21, the annular component 21 located on one side in the length direction Dx elastically deforms in a crushing manner along the vertical direction Dz.

[0050] Furthermore, the force (couple) F22 that stretches the annular component 22 located on the other side of the length direction Dx along the vertical direction Dz Figure 7 (In the image, indicated by the arrow) acts on the annular component 22. Due to this force F22, the annular component 22 located on the other side of the length direction Dx elastically deforms in a manner that expands along the vertical direction Dz.

[0051] (Effects)

[0052] In the storage tank 10 of this embodiment, a pair of annular components 21 and 22 and a cylindrical component 23 are provided between the partition wall 25 and the plurality of reinforcing ribs 27 and the inner wall surface 12w of the cylindrical portion 12 of the storage tank body 11.

[0053] According to the above embodiment, if the fluid in the storage tank 10 oscillates in the longitudinal direction Dx, the pressures P1 and P2 in the longitudinal direction Dx act on the partition wall 25. Furthermore, these pressures P1 and P2 in the longitudinal direction Dx cause the partition wall 25 and the plurality of reinforcing ribs 27 to deform. With the deformation of these partition walls 25 and the plurality of reinforcing ribs 27, the annular members 21 and 22 elastically deform in a manner that expands or crushes along the vertical direction Dz via the cylindrical member 23. In other words, the bending moment at the ends of the partition wall 25 and the plurality of reinforcing ribs 27 is transmitted as a couple of the annular members 21 and 22, causing the annular members 21 and 22 to elastically deform along the vertical direction Dz (radial Dr).

[0054] Therefore, the stress accompanying the elastic deformation of the annular components 21 and 22 in the vertical direction acts on the tank body 11. As a result, as in the case where the partition wall 25 and multiple reinforcing ribs 27 are directly fixed to the tank body 11, local stress near the fixing part can be suppressed.

[0055] Therefore, even under excessive pressure applied to the partition wall 25, the impact on the joint between the waterproof partition wall 20 and the storage tank 10 or the storage tank 10 itself can be suppressed.

[0056] In the above embodiment, an outer peripheral component 29 is also provided, which is disposed radially outside the reinforcing rib 27 through the cylindrical component 23, and engages with the cylindrical component 23 and a pair of annular components 21, 22.

[0057] Therefore, when the partition wall 25 and the plurality of reinforcing ribs 27 deform due to pressures P1 and P2 acting on the partition wall 25 along its length Dx, a portion of the force couple generated by the annular members 21 and 22 can be borne by the outer peripheral member 29. Thus, deformation of the cylindrical member 23 or the annular members 21 and 22 can be suppressed. Furthermore, deformation of the annular members 21 and 22 towards separation and proximity can be suppressed by the outer peripheral member 29. Therefore, stress generated at the connection between the annular members 21 and 22 and the cylindrical member 23 can be reduced.

[0058] Moreover, in the above embodiment, the outer peripheral component 29 does not engage with the inner wall surface 12w of the tank body 11.

[0059] Therefore, even if the partition wall 25 and the multiple reinforcing ribs 27 are deformed by the pressure P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, even if the external force acts on the outer peripheral component 29 from each reinforcing rib 27 through the cylindrical component 23, the stress generated between the outer peripheral component 29 and the tank body 11 can be suppressed because the outer peripheral component 29 does not engage with the inner wall surface 12w of the tank body 11.

[0060] Furthermore, stress typically acts on the circumferential Dc of the tank body 11 of the storage tank 10 due to internal pressure. For example, when the outer peripheral component 29 is joined to the inner wall surface 12w, the joint becomes a stress concentration point that increases the stress acting on the circumferential Dc of the tank body 11. However, by not joining the outer peripheral component 29 to the inner wall surface 12w of the tank body 11, this increase in stress can be suppressed.

[0061] Furthermore, in the above embodiment, the cross-sectional area of ​​the outer peripheral component 29 at the cross section intersecting with the radial Dr gradually decreases from the inner side of the radial Dr toward the outer side.

[0062] Therefore, when the partition wall 25 and the multiple reinforcing ribs 27 deform due to the pressure acting on the partition wall 25 along its length direction Dx, the outer peripheral component 29 contacts the tank body 11, thus suppressing stress concentration. Furthermore, when the partition wall 25 and the multiple reinforcing ribs 27 deform due to the pressures P1 and P2 acting on the partition wall 25 along its length direction Dx, the outer peripheral component 29 can prevent it from hindering the elastic deformation of the annular components 21 and 22 along the vertical direction Dz (radial Dr). Moreover, by gradually reducing the cross-sectional area of ​​the outer peripheral component 29, the rigidity of the outer peripheral component 29 can be gradually reduced, thus avoiding stress concentration caused by a sharp decrease in rigidity.

[0063] Furthermore, in the above embodiment, the partition wall 25 is positioned at a location that overlaps with the annular member 22 in the length direction Dx.

[0064] Therefore, when the partition wall 25 deforms due to the pressure P1 and P2 in the length direction Dx, the bending moment of the partition wall 25 can be transmitted more efficiently and effectively as a couple of the annular member 22 located on the other side of the length direction Dx.

[0065] Furthermore, in the above embodiment, the reinforcing rib 27 is positioned at a location overlapping the annular member 21 in the longitudinal direction Dx. Also, in the above embodiment, the flange 27b of the reinforcing rib 27 is positioned at a location overlapping the annular member 21 in the longitudinal direction Dx.

[0066] Therefore, when the partition wall 25 and the plurality of reinforcing ribs 27 deform together under the pressure P1 and P2 along the length direction Dx, the bending moment of the plurality of reinforcing ribs 27 can be transmitted more efficiently and effectively as a couple of the annular member 21 disposed on one side of the length direction Dx. Furthermore, by positioning the flange 27b of the reinforcing ribs 27 at a position overlapping with the annular member 21 along the length direction Dx, the bending moment of the plurality of reinforcing ribs 27 can be transmitted even more efficiently and effectively as a couple of the annular member 21 disposed on one side of the length direction Dx.

[0067] Furthermore, in the above embodiment, the annular components 21 and 22 are plate-shaped and intersect the length direction Dx.

[0068] Therefore, when the partition wall 25 and the multiple reinforcing ribs 27 are deformed by the pressure P1 and P2 acting on the longitudinal direction Dx of the partition wall 25, the annular components 21 and 22 can be elastically deformed in the radial direction Dr.

[0069] Furthermore, the vessel 1 of the above-described embodiment is equipped with the storage tank 10 as described above.

[0070] Therefore, even when excessive pressures P1 and P2 are applied to the partition wall 25, the effects on the joint between the partition wall 25 and the storage tank 10 or the storage tank 10 itself can be suppressed.

[0071] (Other implementation methods)

[0072] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and design changes that do not depart from the spirit of the present invention are also included. For example, in the above embodiment, the plurality of reinforcing ribs 27 are provided as extending in the vertical direction Dz, but this is not a limitation. For example, each reinforcing rib 27 may extend in the width direction Dy of the tank. Moreover, the reinforcing rib 27 may extend in an inclined direction along the partition wall surface 25f. Furthermore, an example is shown where the reinforcing rib 27 of the above embodiment is straight when viewed from the length direction Dx of the tank 10. However, when viewed from the length direction Dx, the reinforcing rib 27 may be slightly curved. Furthermore, although an example is shown where the plurality of reinforcing ribs 27 extend parallel to each other, this is not a limitation.

[0073] Furthermore, the cross-sectional shape of each stiffener 27 is not limited to a T-shape with a web 27a and a flange 27b. The cross-sectional shape of each stiffener 27 can be, for example, an L-shape, an I-shape, an H-shape, etc.

[0074] Furthermore, in the above embodiment, the storage tank 10 has only one tank body 11, but it is not limited to this. The storage tank 10 can be a multi-bladed type, such as a bi-lobe type or a tri-lobe type, consisting of multiple tank bodies 11 extending along the length direction Dx. In this case, the cross-sectional shape of the tank body 11 is not limited to a circle, but can be other shapes. In this case, the outline of the waterproof partition 20 can be set to a shape corresponding to the cross-sectional shape of the tank body 11 of the bi-lobe type or tri-lobe type storage tank 10.

[0075] Furthermore, in the above embodiment, the storage tank 10 is configured such that the length direction Dx of the cylindrical portion 12 is along the bow-stern direction Da, but it is not limited to this. The storage tank 10 may be configured such that the length direction Dx of the cylindrical portion 12 is along the width direction of the ship.

[0076] Furthermore, in the above embodiment, the storage tank 10 is illustrated with a spherical end portion 13. However, the shape of the end portion of the storage tank 10 in the longitudinal direction is not limited to a hemispherical shape. Moreover, the number or arrangement of the storage tanks 10 provided by the ship 1 is not limited to the above-described case.

[0077] Furthermore, in the above embodiment, the storage tank 10 is designed to contain liquefied gas L, but it is not limited to this. For example, the storage tank 10 can contain various liquids such as fuel and water.

[0078] Furthermore, in the above embodiment, the vessel 1 is equipped with a storage tank 10, but is not limited thereto. The purpose of the storage tank 10 is not limited to marine use, as long as the liquid it contains is volatile. For example, it can be appropriately used for other purposes such as marine structures.

[0079] <Appendix>

[0080] The storage tank 10 and the ship 1 described in the implementation method can be understood as follows, for example.

[0081] (1) The storage tank 10 involved in the first method has:

[0082] The main body of the storage tank 11 has a cylindrical part 12 that extends in the horizontal direction as the length direction Dx;

[0083] A pair of annular components 21 and 22 are arranged at intervals along the length direction Dx on the inner side of the radial Dr of the cylindrical portion 12, and are respectively continuous along the inner wall surface 12w of the cylindrical portion 12 on the circumferential direction Dc, and fixed to the inner wall surface 12w.

[0084] A cylindrical component 23 is disposed inside the radial Dr of the pair of annular components 21 and 22, and is cylindrical in shape extending along the length direction Dx, and connects the inner peripheral portions 21a and 22a of the pair of annular components 21 and 22 to each other;

[0085] A partition wall 25 is disposed on the radially inner side (Dr) of the cylindrical member 23, and closes at least a portion of the radially inner side (Dr) of the cylindrical member 23, and its outer periphery engages with the cylindrical member 23; and

[0086] Multiple reinforcing ribs 27 extend along the partition wall surface 25f on the side of the partition wall 25 facing the length direction Dx, and are fixed to the partition wall surface 25f.

[0087] According to the storage tank 10, when the partition wall 25 and the plurality of reinforcing ribs 27 deform due to pressures P1 and P2 acting on the partition wall 25 along its length direction Dx, the bending moment of the reinforcing ribs 27 is transmitted as a couple of the annular components 21 and 22, causing the annular components 21 and 22 to elastically deform along the radial direction Dr. Therefore, the stress accompanying the elastic deformation of the annular components 21 and 22 along the radial direction Dr acts on the storage tank body 11, thereby suppressing excessive stress at the junction of the annular components 21 and 22 and the inner wall surface 12w of the storage tank body 11. Therefore, even when excessive pressures P1 and P2 act on the partition wall 25, the impact on the junction of the partition wall 25 and the storage tank 10 or the storage tank 10 itself can be suppressed.

[0088] (2) The storage tank 10 involved in the second method is the storage tank 10 of (1), which also has:

[0089] The outer peripheral component 29 is disposed on the outside of the radial Dr relative to the reinforcing rib 27 through the cylindrical component 23, and engages with the cylindrical component 23 and the pair of annular components 21, 22.

[0090] Therefore, when the partition wall 25 and the plurality of reinforcing ribs 27 deform due to the pressure P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, a portion of the force couple generated by the annular components 21 and 22 can be borne by the outer peripheral component 29. Thus, the deformation of the cylindrical component 23 or the annular components 21 and 22 can be suppressed.

[0091] (3) The storage tank 10 involved in the third method is the storage tank 10 of (1), wherein the outer peripheral component 29 is not engaged with the inner wall surface 12w of the storage tank body 11.

[0092] Therefore, even if the partition wall 25 and the multiple reinforcing ribs 27 are deformed by the pressure P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, even if the external force acts on the outer peripheral component 29 from each reinforcing rib 27 through the cylindrical component 23, the stress generated between the outer peripheral component 29 and the tank body 11 can be suppressed because the outer peripheral component 29 does not engage with the inner wall surface 12w of the tank body 11.

[0093] Furthermore, stress typically acts on the circumferential Dc of the tank body 11 of the storage tank 10 due to internal pressure. For example, when the outer peripheral component 29 is joined to the inner wall surface 12w, the joint becomes a stress concentration point that increases the stress acting on the circumferential Dc of the tank body 11. However, by not joining the outer peripheral component 29 to the inner wall surface 12w of the tank body 11, this increase in stress can be suppressed.

[0094] (4) The storage tank 10 involved in the fourth method is the storage tank 10 of (3), wherein the cross-sectional area of ​​the outer peripheral component 29 at the cross section intersecting the radial Dr gradually decreases from the inner side of the radial Dr toward the outer side.

[0095] Therefore, when the partition wall 25 and the multiple reinforcing ribs 27 deform due to the pressure P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, it can suppress the outer peripheral component 29 from hindering the elastic deformation of the annular components 21 and 22 in the radial direction Dr.

[0096] Furthermore, by gradually reducing the cross-sectional area of ​​the outer peripheral component 29, the rigidity of the outer peripheral component 29 can be gradually reduced, thus avoiding stress concentration caused by a sharp decrease in rigidity.

[0097] (5) The storage tank 10 involved in the fifth method is any one of (1) to (4), wherein the partition wall 25 is arranged in the length direction Dx at a position that overlaps with the annular member 22 of the pair of annular members 21, 22 arranged on the other side of the length direction Dx.

[0098] Therefore, when the partition wall 25 deforms due to the pressures P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, the bending moment of the partition wall 25 can be transmitted more efficiently and effectively as a couple of the annular component 22 located on the other side of the longitudinal direction Dx.

[0099] (6) The storage tank 10 involved in the sixth method is any one of (1) to (5), wherein the reinforcing rib 27 is disposed at a position in the length direction Dx that overlaps with the annular member 21 disposed on one side of the pair of annular members 21, 22 disposed in the length direction Dx.

[0100] Therefore, when the partition wall 25 and the multiple reinforcing ribs 27 deform together due to the pressure P1 and P2 acting on the partition wall 25 in the longitudinal direction Dx, the bending moment of the multiple reinforcing ribs 27 can be transmitted more efficiently and effectively as a couple of the annular component 21 disposed on one side of the longitudinal direction Dx.

[0101] (7) The storage tank 10 involved in the seventh method is any one of (1) to (6) wherein the annular components 21 and 22 are plate-shaped and intersect the length direction Dx.

[0102] Therefore, when the partition wall 25 and the multiple reinforcing ribs 27 are deformed by the pressure P1 and P2 acting on the longitudinal direction Dx of the partition wall 25, the annular components 21 and 22 can be elastically deformed in the radial direction Dr.

[0103] (8) The vessel 1 involved in the method 8 has any one of (1) to (7) storage tanks 10.

[0104] Therefore, even when excessive pressures P1 and P2 are applied to the partition wall 25, the impact on the joint between the partition wall 25 and the storage tank 10 or the storage tank 10 itself can be suppressed. Thus, damage to the storage tank 10 installed on the ship 1 can be suppressed, thereby reducing the maintenance burden on the ship 1.

[0105] Industrial availability

[0106] The storage tank and vessel according to the present invention can suppress the impact on the joint between the partition wall and the storage tank or the storage tank itself, even when excessive pressure is applied to the partition wall.

[0107] Symbol Explanation

[0108] 1-Ship, 2-Hull, 2a-Bow, 2b-Stern, 3A, 3B-Side, 4-Bottom, 5-Upper Deck, 7-Superstructure, 8-Tank mounting area, 10-Tank, 11-Tank body, 12-Cylindrical part, 12w-Inner wall surface, 13-End spherical part, 20-Waterproof partition, 21, 22-Annular component, 21a, 22a-Inner periphery, 21s, 22s-Outer periphery, 23-Cylindrical component, 25-Partition, 25f-Partition surface, 27-Reinforcing rib, 27a-Web plate, 27b-Flange, 29-Outer periphery, 29p-Recess, 29r, 29s-End, L-Liquefied gas.

Claims

1. A storage tank, comprising: The main body of the storage tank has a cylindrical section that extends horizontally along its length. A pair of annular components are arranged at intervals along the length direction on the radially inner side of the cylindrical portion, and are respectively continuous in the circumferential direction along the inner wall surface of the cylindrical portion and fixed to the inner wall surface; A cylindrical component is disposed radially inside the pair of annular components and is cylindrical in shape extending along the length direction, and connects the inner peripheral edges of the pair of annular components to each other; A partition wall is disposed on the radially inner side of the cylindrical member and closes at least a portion of the radially inner side of the cylindrical member, and its outer periphery engages with the cylindrical member; and Multiple reinforcing ribs extend along one side of the partition wall surface toward the partition wall in the length direction and are fixed to the partition wall surface.

2. The storage tank according to claim 1, further comprising: The outer peripheral component is disposed radially outward relative to the reinforcing rib, separated from the cylindrical component, and engages with the cylindrical component and the pair of annular components.

3. The storage tank according to claim 2, wherein, The outer peripheral component does not engage with the inner wall surface of the tank body.

4. The storage tank according to claim 3, wherein, The cross-sectional area of ​​the outer peripheral component at the cross section intersecting the radial direction gradually decreases from the radial inner side to the outer side.

5. The storage tank according to any one of claims 1 to 4, wherein, The partition wall is positioned in the length direction to overlap with one of the pair of annular members, which is positioned on the other side of the length direction.

6. The storage tank according to any one of claims 1 to 5, wherein, The reinforcing rib is positioned in the length direction at a location that overlaps with one of the pair of annular members positioned on one side of the length direction.

7. The storage tank according to any one of claims 1 to 6, wherein, The annular component is plate-shaped and intersects the length direction.

8. A vessel comprising a storage tank according to any one of claims 1 to 7.

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