Ships

Abstract

Install fixed ballast efficiently. [Solution] The vessel comprises a hull having a pair of side plates and bottom plates, a tank provided in a tank housing space partitioned below by the bottom plate, a plurality of longitudinal reinforcing members spaced apart in the width direction of the vessel, each protruding upward from the bottom plate, with its upper end spaced apart below the tank, and extending in the bow-stern direction, and fixed ballast provided in a holding space formed between adjacent longitudinal reinforcing members in the width direction of the vessel.

Description

Technical Field

[0001] This disclosure relates to a ship.

Background Art

[0002] Patent Document 1 discloses a ship that mounts fixed ballast made of heavy concrete at the bottom of the ship in order to correct the initial trim and initial heel of the hull. In the ship of this Patent Document 1, the fixed ballast is mounted in a watertight compartment between the outer bottom plate constituting the double bottom as the bottom of the ship and the lowest deck.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a ship equipped with a tank capable of storing liquefied gas or the like, an initial plan is made to satisfy the regulatory requirements regarding stability, and in many cases, a compartment where fixed ballast can be installed is not formed below the tank accommodated in the tank hold. In such a ship, as a method of satisfying or improving the stability, it may be desirable to install fixed ballast in the tank hold. However, there is only limited space below the tank, and it is necessary to install the fixed ballast while avoiding interference with the tank. For this reason, in order to install more fixed ballast in the limited space, it is desired to install the fixed ballast efficiently.

[0005] This disclosure has been made to solve the above problems, and an object thereof is to provide a ship capable of efficiently installing fixed ballast.

Means for Solving the Problems

[0006] To solve the above problems, the vessel according to this disclosure comprises a hull, a tank, longitudinal reinforcing members, and fixed ballast. The hull has a pair of side plates and bottom plates. The tank is provided in a tank housing space partitioned at the bottom plate below. Multiple longitudinal reinforcing members are provided at intervals in the width direction of the vessel. Each longitudinal reinforcing member protrudes upward from the bottom plate, its upper end is spaced apart below the tank, and extends in the bow-stern direction. The fixed ballast is provided in a holding space formed between adjacent longitudinal reinforcing members in the width direction of the vessel. [Effects of the Invention]

[0007] According to the vessel of this disclosure, fixed ballast can be installed efficiently. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of a floating body equipped with a vessel according to an embodiment of the present disclosure. [Figure 2] This is a cross-sectional view showing the configuration of a longitudinal reinforcing member and fixed ballast in a vessel according to an embodiment of the present disclosure. [Figure 3] This is a cross-sectional view showing the configuration of a longitudinal reinforcing member and fixed ballast in a ship according to a first modified example of the embodiment of this disclosure. [Figure 4] This is a cross-sectional view showing the configuration of a longitudinal reinforcing member and fixed ballast in a ship according to a first modified example of the embodiment of this disclosure. [Modes for carrying out the invention]

[0009] Hereinafter, a vessel according to the embodiment of this disclosure will be described with reference to Figures 1 to 4. (Overall configuration of the ship) As shown in Figure 1, the vessel 1 of this embodiment comprises a hull 2, a tank 20, and a fixed ballast section 30. Examples of vessel 1 include a carrier for liquefied gases such as carbon dioxide, liquefied natural gas (LNG), and ammonia.

[0010] (Hull structure) The hull 2 ​​has a pair of side panels 3A and 3B that form its outer shell, a bottom 4, and an upper deck 5. The side panels 3A and 3B each have a pair of side plating 3p that form the port and starboard sides, respectively. The bottom 4 has a bottom plating 4p that connects these side panels 3A and 3B. In this embodiment, the hull 2 ​​is shown with a superstructure 7 having living quarters formed on the upper deck 5 on the stern side 2b, but the position of the superstructure 7 is merely an example, and it may be located, for example, on the bow side 2a of the hull 2.

[0011] The hull 2 ​​is provided with bulkheads 9A and 9B spaced apart in the bow-stern direction FA. Bulkheads 9A and 9B each partition the space within the hull 2, which is surrounded by the bottom plating 4p and a pair of side platings 3p, in the bow-stern direction FA. Bulkhead 9A is the bow bulkhead, etc., and is located on the side of the bow-stern direction FA that is closer to the bow 2a. Bulkhead 9B is located on the side of the bow-stern direction FA that is closer to the stern 2b relative to bulkhead 9A. A tank storage space 8 is formed in the hull 2 ​​between bulkheads 9A and 9B. The tank storage space 8 is partitioned at least at the bottom by the bottom plating 4p.

[0012] (Tank configuration) Tank 20 is capable of storing liquids or gases inside. Examples of liquids that can be stored in Tank 20 include liquefied gases such as liquefied carbon dioxide, liquefied natural gas (LNG), and liquefied ammonia. The liquid stored in Tank 20 in this embodiment may be fuel for, for example, the main engine, auxiliary engines, and generator engines (none of which are shown) housed in the hull 2.

[0013] The tank 20 is located in the tank housing space 8. In this embodiment, multiple tanks 20 (for example, two) are arranged in the bow-stern direction FA. The tank 20 in this embodiment comprises a cylindrical portion 20a and an end plate portion 20b. The cylindrical portion 20a is provided in the middle of the tank 20 in the bow-stern direction FA and is formed in a cylindrical shape that is continuous with the bow-stern direction FA.

[0014] Here, the tank 20 in this embodiment is a so-called cylindrical tank. The cross-sectional contour of the cylindrical portion 20a perpendicular to the bow-stern direction FA is circular. The diameter of the cylindrical portion 20a in the bow-stern direction FA is constant. End plate portions 20b are provided at both ends of the cylindrical portion 20a in the bow-stern direction FA. Each end plate portion 20b is spherical in shape and protrudes in the bow-stern direction FA, closing both ends of the cylindrical portion 20a in the bow-stern direction FA. Each tank 20 in this embodiment is not limited to the cylindrical tank described above, but may be a spherical tank or a rectangular tank, for example. Also, although an example has been given of a case where multiple tanks 20 are provided, only one tank 20 may be provided for the hull 2.

[0015] Figure 2 is a cross-sectional view showing the configuration of the longitudinal reinforcing member and the fixed ballast in a vessel according to an embodiment of the present disclosure. In this embodiment, the tank housing space 8 is formed symmetrically with respect to the center in the ship width direction Dw (in other words, the ship's centerline). Therefore, in Figure 2, only one side in the ship width direction Dw (for example, the side 3A) of the lower part of the ship 2 equipped with the longitudinal reinforcing member 15 and the fixed ballast section 30 is shown.

[0016] As shown in Figure 2, the hull 2 ​​of this embodiment has ballast tanks 11 at the corners where the bottom 4 and the sides 3A and 3B intersect. Each of these ballast tanks 11 is formed by being surrounded by a portion 4d of both ends 4d in the width direction Dw of the bottom plating 4p, a portion 3d of the lower part of the side plating 3p, and a connecting plate 12 that connects the bottom plating 4p and the side plating 3p. The ballast tanks 11 are capable of storing seawater or the like inside, or discharging the stored seawater or the like to the outside.

[0017] (Configuration of vertical reinforcing members) In this embodiment, the longitudinal reinforcing member 15 and the fixed ballast section 30 are provided symmetrically on both sides with respect to the center of the hull 2 ​​in the width direction Dw (hereinafter referred to as the width direction center Dwc). The following description will explain the configuration of the longitudinal reinforcing member 15 and the fixed ballast section 30 on one side in the width direction Dw.

[0018] On the upper surface 4t of the bottom shell plating 4p, a plurality of longitudinal reinforcing members 15 are provided. The plurality of longitudinal reinforcing members 15 are provided at intervals in the ship width direction Dw. Each longitudinal reinforcing member 15 is, for example, a member called a longitudinal girder, a girder, or the like. The longitudinal reinforcing member 15 protrudes upward from the upper surface 4t and extends in the fore-and-aft direction FA of the ship.

[0019] In the present embodiment, on one side in the ship width direction Dw from the center Dwc in the ship width direction of the hull 2, longitudinal reinforcing members 151 to 155 are provided as the plurality of longitudinal reinforcing members 15. Among these longitudinal reinforcing members 151 to 155, the longitudinal reinforcing member 151 is provided at the center Dwc in the ship width direction. Further, the longitudinal reinforcing member 151 is provided vertically below the center portion of the tank 20. The longitudinal reinforcing member 151 illustrated in the present embodiment has a T-shaped cross-sectional shape when viewed from the fore-and-aft direction FA. In the present embodiment, among the longitudinal reinforcing members 151 to 155, the other longitudinal reinforcing members 152 to 155 excluding the longitudinal reinforcing member 151 have an inverted L-shaped cross-sectional shape when viewed from the fore-and-aft direction FA. Note that the number of the longitudinal reinforcing members 15, the installation interval in the ship width direction Dw, and the cross-sectional shape can be changed as appropriate. In addition, in the present embodiment, the case where the longitudinal reinforcing member 151 is provided at the center Dwc in the ship width direction is illustrated. Further, in the present embodiment, the case where the longitudinal reinforcing member 151 is provided vertically below the center portion of the tank 20 is illustrated. However, the arrangement of the longitudinal reinforcing member 151 is not limited to the center Dwc in the ship width direction or vertically below the center portion of the tank 20. The longitudinal reinforcing member 151 may be provided, for example, at a position slightly deviated from the center Dwc in the ship width direction or at a position slightly deviated in the ship width direction Dw from vertically below the center portion of the tank 20.

[0020] The heights of the longitudinal reinforcing members 151 to 155 in the present embodiment gradually increase from the center Dwc in the ship width direction toward the outside in the ship width direction Dw. That is, among the longitudinal reinforcing members 15 adjacent to each other in the ship width direction Dw, the height of the longitudinal reinforcing member 15 located on the outside in the ship width direction Dw is larger than the height of the longitudinal reinforcing member 15 located on the inside in the ship width direction Dw.

[0021] Specifically, the height of vertical reinforcing member 152 is greater than the height of vertical reinforcing member 151, and the height of vertical reinforcing member 153 is greater than the height of vertical reinforcing member 152. Furthermore, the height of vertical reinforcing member 154 is greater than the height of vertical reinforcing member 153, and the height of vertical reinforcing member 155 is greater than the height of vertical reinforcing member 154. The upper ends 15t of these multiple vertical reinforcing members 151 to 155 are installed below the tank 20, spaced apart by a distance greater than or equal to the protective distance predetermined by the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk), etc.

[0022] (Configuration of the fixed ballast section) The fixed ballast section 30 is provided on the upper surface 4t of the hull bottom plating 4p. The fixed ballast section 30 comprises a plurality of fixed ballasts 31A installed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0023] A holding space S for holding fixed ballast 31A is formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw. The fixed ballast 31A is installed in the holding space S between adjacent longitudinal reinforcing members 15 in the ship width direction Dw. In this embodiment, the fixed ballast 31A is provided with the upper end level 15t of the longitudinal reinforcing member 15 that is lower in height in the vertical direction Dv among the adjacent longitudinal reinforcing members 15 in the ship width direction Dw. That is, the fixed ballast 31A may be provided up to the same level as the upper end 15t of the longitudinal reinforcing member 15 that is lower in height among the adjacent longitudinal reinforcing members 15 in the ship width direction Dw, or it may be provided at a level lower than the upper end 15t.

[0024] In this embodiment, the fixed ballast 31A1 installed between vertical reinforcing member 151 and vertical reinforcing member 152 extends up to the level of the upper end 15t of vertical reinforcing member 151. Furthermore, the fixed ballast 31A2 installed between vertical reinforcing member 152 and vertical reinforcing member 153 extends up to the level of the upper end 15t of vertical reinforcing member 152. The fixed ballast 31A3 installed between vertical reinforcing member 153 and vertical reinforcing member 154 extends up to the level of the upper end 15t of vertical reinforcing member 153. The fixed ballast 31A4 installed between vertical reinforcing member 154 and vertical reinforcing member 155 extends up to the level of the upper end 15t of vertical reinforcing member 154.

[0025] Furthermore, in this embodiment, fixed ballast 31A5 is provided between the longitudinal reinforcing member 155 and the ballast tank 11 located outside the longitudinal reinforcing member 155 in the ship width direction Dw. The fixed ballast 31A5 is provided with an upper limit of the level of the upper end 15t of the longitudinal reinforcing member 155, which is shorter in height than the ballast tank 11.

[0026] In this embodiment, concrete 32 is used as the fixed ballast 31A. The concrete 32 forming the fixed ballast 31A is filled (in other words, poured) between adjacent longitudinal reinforcing members 15 in the ship width direction Dw, and then hardens, so that it is fixed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0027] In this embodiment, the multiple fixed ballasts 31A are provided on the inside of the ship's width direction Dw (in other words, on the side closer to the ship's centerline) relative to the ballast tanks 11 provided on both sides in the ship's width direction Dw. Furthermore, this embodiment exemplifies a case where the multiple fixed ballasts 31A are provided in an area that overlaps with the tank 20 when viewed from the vertical direction Dv. That is, the multiple fixed ballasts 31A are provided on the inside of the ship's width direction Dw relative to the ends 20s of the tank 20 on both sides in the ship's width direction Dw. Note that the installation position of the multiple fixed ballasts 31A in the bow-stern direction FA may be provided over the entire area between bulkhead 9A and bulkhead 9B, or it may be provided only in a part of the area between bulkhead 9A and bulkhead 9B.

[0028] (Effects and Benefits) In the vessel 1 of the above embodiment, fixed ballast 31A is provided in a holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw. This allows more fixed ballast 31A to be installed in the limited space below the tank 20 while avoiding interference with the tank 20. As a result, it becomes possible to install fixed ballast 31A efficiently.

[0029] Furthermore, in the above embodiment, the height of the longitudinal reinforcing member 15 located outside the ship's width direction Dw is gradually increased compared to the height of the longitudinal reinforcing member 15 located at the ship's width center Dwc. This allows multiple longitudinal reinforcing members 15 to be formed at a greater height while avoiding interference with the tank 20, for example, when the cross-sectional contour of the tank 20 perpendicular to the ship's centerline is circular. Consequently, the thickness in the vertical direction Dv of the fixed ballast 31A located outside the ship's width direction Dw can be gradually increased compared to the thickness in the vertical direction Dv of the fixed ballast 31A located closer to the ship's width center Dwc. As a result, more fixed ballast 31A can be installed in the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship's width direction Dw.

[0030] Furthermore, in the above embodiment, concrete 32 is used as the fixed ballast 31A. This makes it easy to construct the fixed ballast 31A, as it only requires pouring and hardening the concrete 32 into the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0031] (First modified example of the embodiment) In the above embodiment, concrete 32 was used as the fixed ballast 31A, but the invention is not limited to this. Figure 3 is a cross-sectional view showing the configuration of a longitudinal reinforcing member and fixed ballast in a ship according to a first modified example of the embodiment of this disclosure.

[0032] For example, as shown in Figure 3, instead of concrete 32, the fixed ballast 31B of the fixed ballast section 30 may be replaced with an aggregate 33 of at least one of sand, gravel, rubber (e.g., high-density rubber), and metal lumps. The metal lumps may be made of a metal with a specific gravity greater than water, such as iron. The rubber and metal lumps may be spherical, irregularly shaped granules, blocks, etc. Such aggregates 33 are housed (placed) in the holding space S between adjacent longitudinal reinforcing members 15 in the ship width direction Dw. Thus, since the assembly 33 only needs to be housed in the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw, the fixed ballast 31B can be easily constructed, similar to the case of concrete 32.

[0033] In the first modified embodiment, the fixed ballast section 30 further comprises a cover 35. The cover 35 closes the holding space S between adjacent longitudinal reinforcing members 15 in the ship width direction Dw from above. The cover 35 can be formed from, for example, mortar. The thickness of the cover 35 in the vertical direction Dv may vary according to the spacing between adjacent longitudinal reinforcing members 15 in the ship width direction Dw. This cover 35 prevents a portion of the assembly 33 within the holding space S from falling out of the holding space S due to the rocking motion of the ship 1 during navigation.

[0034] (Second modified example of the embodiment) Figure 4 is a cross-sectional view showing the configuration of a longitudinal reinforcing member and fixed ballast in a ship according to a second modified example of the embodiment of this disclosure. As shown in Figure 4, the vertical reinforcing member 15 may comprise a vertical reinforcing member body 17 and a partition plate 18.

[0035] The longitudinal reinforcing member body 17 has a cross-sectional shape, such as a T-shape or inverted L-shape, when viewed from the bow-stern direction FA, and is referred to as a longitudinal or girder, protruding upward from the bottom plating 4p. In this embodiment, the height of the multiple longitudinal reinforcing member bodies 17, which are spaced apart in the width direction Dw of the ship, is the same.

[0036] The partition plate 18 is provided on some of the vertical reinforcing member bodies 17 among the multiple vertical reinforcing member bodies 17. The partition plate 18 can be connected to the upper end of the vertical reinforcing member body 17, for example, by welding. The partition plate 18 protrudes upward from the upper end of the vertical reinforcing member body 17 and extends in the bow-stern direction FA.

[0037] In this configuration, fixed ballast 31A is installed in the holding space S between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0038] According to the second modification of the above embodiment, the height of the holding space S for installing the fixed ballast 31A can be increased by providing a partition plate 18 at the upper end of the vertical reinforcing member body 17 as needed. Therefore, depending on the gap in the vertical direction Dv between the bottom plating 4p and the tank 20, the holding space S for installing the fixed ballast 31A can be made higher while avoiding interference with the tank 20. As a result, similar to the above embodiment, it becomes possible to install more fixed ballast 31A in the holding space S formed between adjacent vertical reinforcing members 15 in the ship width direction Dw.

[0039] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure.

[0040] In the above embodiment, fixed ballast 31A and 31B are installed in all of the spaces between adjacent longitudinal reinforcing members 15 in the ship width direction Dw, but the embodiment is not limited to this. Fixed ballast 31A and 31B may be installed in only a portion of the spaces between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0041] Furthermore, although only the longitudinal reinforcing member 15 extending in the bow-stern direction FA has been described in the above embodiment, a transverse reinforcing member (not shown) formed to intersect with the longitudinal reinforcing member 15 may also be provided. The transverse reinforcing member intersecting with the longitudinal reinforcing member 15 may be used as a wall to demarcate the holding space S for installing fixed ballast.

[0042] Furthermore, the fixed ballast may be in the form of a slurry or paste, for example, consisting of a mixture of minerals and mud in a liquid.

[0043] <Note> The vessel 1 described in the embodiment can be understood, for example, as follows:

[0044] (1) The vessel 1 according to the first embodiment comprises a hull 2 ​​having a pair of side plates 3p and bottom plates 4p, a tank 20 provided in a tank housing space 8 partitioned below by the bottom plates 4p, a plurality of longitudinal reinforcing members 15 provided at intervals in the width direction Dw, each projecting upward from the bottom plates 4p, with its upper end 15t spaced apart below the tank 20 and extending in the bow-stern direction FA, and fixed ballast 31A provided in a holding space S formed between adjacent longitudinal reinforcing members 15 in the width direction Dw, wherein the height of the plurality of longitudinal reinforcing members is lowest for the longitudinal reinforcing member closest to the center in the width direction, and gradually increases as it moves away from the center in the width direction outward in the width direction.

[0045] If the tank 20 is a cylindrical or spherical tank with a circular cross-sectional profile, the gap between the bottom plating 4p and the tank 20 in the vertical direction Dv is larger on the outside in the width direction Dw relative to the center Dwc in the width direction. In contrast, by gradually increasing the height of the longitudinal reinforcing members 15 located on the outside in the width direction Dw relative to the height of the longitudinal reinforcing members 15 located below the center of the tank 20 in the width direction Dw, multiple longitudinal reinforcing members 15 can be made taller while avoiding interference with the tank 20. As a result, more fixed ballast 31A can be installed in the holding space S formed between adjacent longitudinal reinforcing members 15 in the width direction Dw.

[0046] (2) The vessel 1 according to the second embodiment is the vessel 1 of (1), wherein the fixed ballast 31A is concrete 32.

[0047] As a result, the fixed ballast 31A can be easily constructed because it is only necessary to pour and harden concrete 32 in the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw.

[0048] (3) The vessel 1 according to the third embodiment is the vessel 1 of (1) or (2), wherein the fixed ballast 31B is an aggregate 33 of at least one of sand, gravel, rubber, and metal lumps having a specific gravity greater than water.

[0049] As a result, it is only necessary to install at least one aggregate 33 of sand, gravel, rubber, and metal blocks in the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw, thus enabling easy construction of the fixed ballast 31B.

[0050] (4) The vessel 1 according to the fourth embodiment further comprises a cover 35 that closes the holding space S between adjacent longitudinal reinforcing members 15 in the width direction Dw of the vessel 1 according to (3) from above.

[0051] As a result, the cover 35 prevents the assembly 33, which is installed in the holding space S formed between adjacent longitudinal reinforcing members 15 in the ship width direction Dw, from falling out of the holding space S.

[0052] (5) The vessel 1 according to the fifth embodiment is any one of the vessels 1 of (1) to (4), wherein the longitudinal reinforcing member 15 comprises a longitudinal reinforcing member body 17 that protrudes upward from the bottom plating 4p of the hull, and a partition plate 18 connected to the upper end of the longitudinal reinforcing member body 17 and extending in the bow-stern direction FA.

[0053] This allows the height of the holding space S to be increased by providing a partition plate 18 at the upper end of the vertical reinforcing member body 17 as needed. Therefore, depending on the gap between the bottom plating 4p and the tank 20 in the vertical direction Dv, the holding space S can be made higher while avoiding interference with the tank 20. As a result, more fixed ballast 31A can be installed in the holding space S formed between adjacent vertical reinforcing members 15 in the ship width direction Dw. [Explanation of Symbols]

[0054] 1...Ship 2…hull 2a…bow 2b…stern 3A, 3B...Side 3d…some 3p...Ship's hull plating 4...Bottom of the ship 4d…some 4p...Bottom plating 4t…Top surface 5…Upper deck 7...Superstructure 8... Tank storage space 9A, 9B…Bulkhead 11... Ballast tank 12…Connecting plate 15, 151-155... Vertical reinforcing members 15t…Top end 17…Main body of vertical reinforcing member 18… Partition plate 20... Tank 20a...Cylindrical part 20b... End plate section 20s...end 30... Fixed ballast section 31A, 31A1~31A5, 31B... Fixed ballast 32…Concrete 33…Aggregation 35... Lid S…Holding space

Claims

1. A hull having a pair of side plating and bottom plating, A tank provided in a tank housing space partitioned below by the hull bottom plating, Multiple longitudinal reinforcing members are provided at intervals in the width direction of the ship, each projecting upward from the bottom plating of the ship, with their upper ends spaced apart below the tank, and extending in the bow-stern direction. Fixed ballast provided within a holding space formed between adjacent longitudinal reinforcing members in the ship's width direction, Equipped with, A ship in which the heights of the multiple longitudinal reinforcing members are such that the height of the longitudinal reinforcing member closest to the center in the width direction is the lowest, and the heights gradually increase as they move away from the center in the width direction outward in the width direction.

2. The aforementioned fixed ballast is concrete. The vessel according to claim 1.

3. The aforementioned fixed ballast is an aggregate of at least one of the following: sand, gravel, rubber, and metal lumps with a specific gravity greater than that of water. The vessel according to claim 1 or 2.

4. The vessel further comprises a cover that closes the holding space between adjacent longitudinal reinforcing members in the width direction of the vessel from above. The vessel according to claim 3.

5. The aforementioned vertical reinforcing member is The vertical reinforcing member body protrudes upward from the hull bottom plating, The system includes a partition plate connected to the upper end of the main body of the longitudinal reinforcing member and extending in the direction of the bow and stern of the ship. The vessel according to claim 1 or 2.

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