Ships

Abstract

To suppress hogging longitudinal bending moment generated in a hull.SOLUTION: A vessel includes a hull having a pair of broadsides and a bottom, a plurality of compartments arranged in the bow-stern direction of the hull, and a fuel tank arranged in a rear unit of the hull, and the hull includes a broad side double structure unit formed only in a portion corresponding to at least one compartment arranged in a central unit in the bow-stern direction excluding the compartment on the most bow side and the most stern side among the plurality of compartments and having a pair of partition walls arranged inside in the vessel width direction against the pair of broadsides.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to marine vessels. [Background technology]

[0002] Patent Document 1 discloses a ship having a fuel tank on the upper deck at the stern of the hull. The fuel tank stores liquefied gas that serves as fuel for the main engine and other engines that provide the propulsive force to propel the ship. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6966661 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the fuel tank is located on the upper deck at the stern of the hull. Therefore, stress acts on the hull due to the load of the fuel tank and the fuel stored in the fuel tank. In particular, when the amount of cargo carried inside the hull is small, the hogging vertical bending moment caused by bending deformation that causes the hull to bend upward can become large in the center of the hull in the bow-stern direction connecting the bow and stern sides.

[0005] The present disclosure has been made to solve the above-mentioned problem, and aims to provide a ship that can suppress the hogging vertical bending moment that occurs in the hull. [Means for solving the problem]

[0006] In order to solve the above problems, a watercraft according to the present disclosure includes a hull, a plurality of compartments, and a fuel tank. The hull has a pair of sides and a bottom. The plurality of compartments are arranged in a bow-stern direction within the hull. The fuel tank includes: The aft section includes the aftmost section of the multiple compartments, from the aftmost section to the second aftmost section. the rear of the hull regionThe hull is provided with a plurality of compartments, each of which is arranged in the center in the bow-stern direction, excluding the compartments on the bow-most side and the stern-most side. all The hull is provided with a double-walled structure having a pair of bulkheads, the pair of bulkheads being disposed inward in the width direction of the ship relative to the pair of bulkheads. The side double structure section is provided with ballast tank sections formed between the side walls and the bulkheads on both sides in the ship width direction. [Effects of the Invention]

[0007] According to the ship of the present disclosure, the hogging vertical bending moment that occurs in the hull can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a schematic configuration of a vessel according to an embodiment of the present disclosure. FIG. [Figure 2] 1 is a plan view showing a schematic configuration of a vessel according to an embodiment of the present disclosure. FIG. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2, showing the configuration of a ship side double-layered structure portion in the marine vessel according to the first embodiment of the present disclosure. FIG. [Figure 4] FIG. 10 is a cross-sectional view showing the configuration of a ship side double structure section according to a second embodiment of the present disclosure. [Figure 5] FIG. 10 is a cross-sectional view showing the configuration of a side double structure section according to a modified example of the second embodiment of the present disclosure. [Figure 6] FIG. 10 is a side view showing an example of the arrangement of a fuel tank according to another modified example of the embodiment of the present disclosure. [Figure 7] FIG. 10 is a side view showing an example of the arrangement of a fuel tank according to yet another modified example of the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. First Embodiment (Overall configuration of the ship) 1 and 2, the ship 1A of this embodiment includes at least a hull 2, a plurality of compartments S, a fuel tank 10, and a double-walled side structure section 50A. The type of ship 1A is not limited to a specific one. Examples of the type of ship 1A include bulk carriers, carriers of liquefied gases such as liquefied natural gas (LNG), carbon dioxide, and ammonia, ferries, roll-on / roll-off ships (RORO ships), pure car and truck carriers (PCTCs), and passenger ships.

[0010] As shown in FIG. 3 , the hull 2 ​​has a pair of side walls 3A, 3B, a bottom wall 4, and an upper deck 5 that form its outer hull. The side walls 3A, 3B are provided with a pair of side wall shells 3s that form the port and starboard sides, respectively. The bottom wall 4 is provided with a bottom wall shell 4s that connects the side walls 3A, 3B. The pair of side walls 3A, 3B and the bottom wall 4 give the hull 2 ​​a U-shape in a cross section perpendicular to the bow-stern direction FA. The hull 2 ​​has multiple decks inside, including an upper deck 5 and a bottom wall 6. The upper deck 5 is a full-length deck located on the uppermost level. The upper deck 5 is exposed to the outside. The bottom wall 6 is located on the lowest level within the hull 2. A bottom ballast tank section 58 is formed between the bottom wall 6 and the bottom wall 4. Ballast water (not shown) is poured into the bottom ballast tank section 58. Note that a portion of the inner ballast tank section 58 may not be poured with ballast water, and may be used as a pipe space through which piping and wiring are inserted.

[0011] As shown in FIG. 1, the hull 2 ​​has a superstructure 7 formed on an upper deck 5 on the stern 2b side, the superstructure 7 having an accommodation area. The fuel tank 10 is provided at the rear of the hull 2. The fuel tank 10 is provided, for example, on the upper deck 5. The fuel tank 10 is arranged on the stern 2b side in the fore-aft direction FA relative to the superstructure 7. In this embodiment, the fuel tank 10 is arranged on the stern 2b side relative to the superstructure 7. The fuel tank 10 stores liquefied gas, for example liquefied natural gas, which serves as fuel for the engine 21, which will be described later.

[0012] As shown in Figures 1 and 2, a plurality of compartment walls 11 are formed at intervals in the fore-and-aft direction FA inside the hull 2. The plurality of compartment walls 11 are arranged at intervals in the fore-and-aft direction FA. The plurality of compartment walls 11 each extend from the side 3A to the side 3B, and also extend from the bottom deck 6 to the upper deck 5. In other words, between the pair of side walls 3A, 3B, the space between the bottom deck 6 and the upper deck 5 is divided in the fore-and-aft direction by the plurality of compartment walls 11.

[0013] The multiple compartments S are arranged in the fore-and-aft direction FA inside the hull 2. The multiple compartments S are formed by dividing the space between the side 3A on one side in the ship's width direction Dw, the side 3B on the other side, the bottom deck 6 below, and the upper deck 5 above with multiple compartment walls 11. The multiple compartments S are arranged side by side in the fore-and-aft direction FA. In this embodiment, seven compartments S1 to S7 are arranged in the fore-and-aft direction FA as the multiple compartments S. Adjacent compartments S in the fore-and-aft direction FA are separated by compartment walls 11.

[0014] Of the multiple compartments S1 to S7, compartment S1, which is located furthest to the stern 2b in the fore-aft direction FA, is used as an engine room. The engine room is formed within the hull 2 ​​on the stern 2b side of the compartment wall 11A, which is located furthest to the stern 2b in the fore-aft direction FA.

[0015] As shown in FIG. 1 , a prime mover 21 is disposed in a compartment S1 serving as an engine room. The prime mover 21 uses liquefied gas supplied from a fuel tank 10 as fuel. In this embodiment, the prime mover 21 is, for example, a main engine and an auxiliary engine. The prime mover 21 serving as a main engine generates propulsive force for sailing the vessel 1A. The prime mover 21 serving as a main engine drives and rotates a screw 8 provided outside the stern 2b of the hull 2. The prime mover 21 serving as an auxiliary engine generates power used within the vessel 1A. In this embodiment, the prime mover 21 serving as an auxiliary engine is, for example, a generator engine for driving a generator (not shown). For example, a steam turbine, a gas turbine, a reciprocating engine, or the like can be used as the prime mover 21.

[0016] Of the multiple compartments S1 to S7, compartments S2 to S6 located in the central portion 2c in the fore-aft direction FA, excluding compartment S7 closest to the bow 2a and compartment S1 closest to the stern 2b, are so-called cargo compartments that accommodate cargo to be transported by the ship 1A. These compartments S2 to S6 are located closer to the bow 2a than compartment wall 11A located closest to the stern 2b in the fore-aft direction FA. In this embodiment, the cargo compartments of compartments S2 to S6 store ore, grain, or the like as cargo.

[0017] The fuel tank 10 is arranged in the aft area Ab, which is the portion closest to the stern 2b and includes the compartment S2 at the stern 2b among the compartments S2 to S6 serving as cargo compartments.

[0018] The side double-structure section 50A is formed only in a portion corresponding to at least one of the sections S2 to S6 arranged in the central part 2c in the fore-aft direction FA, excluding the section S7 closest to the bow 2a and the section S1 closest to the stern 2b among the multiple sections S1 to S7. In this embodiment, the side double-structure section 50A is formed in the sections S2 to S6 arranged in the central part 2c in the fore-aft direction FA. The side double-structure section 50A increases the strength of the hull 2 ​​against the hogging vertical bending moment. As shown in FIG. 3, the ship side double structure section 50A includes a pair of bulkheads 51A and 51B, ballast tank sections 52A and 52B, a cargo hold 53, and an inner ballast tank section .

[0019] As shown in Figures 2 and 3, the pair of bulkheads 51A, 51B are arranged at a distance inward in the ship's beam direction Dw relative to the pair of shipsides 3A, 3B. Each of the bulkheads 51A, 51B extends in the fore-aft direction FA when viewed from above. Each of the bulkheads 51A, 51B extends throughout the entire compartments S2 to S6 in the fore-aft direction FA. As shown in Figure 3, each of the bulkheads 51A, 51B extends in the vertical direction Dv when viewed from the fore-aft direction FA. The lower end of each of the bulkheads 51A, 51B is joined to the bottom deck 6. Each of the bulkheads 51A, 51B rises upward in the vertical direction Dv from the bottom deck 6. The upper end of each of the bulkheads 51A, 51B is joined to the upper deck 5, which serves as an upper deck formed above the bottom deck 6 in the vertical direction Dv.

[0020] The ballast tank sections 52A, 52B are formed on both outer sides of the pair of bulkheads 51A, 51B in the ship's transverse direction Dw. The ballast tank sections 52A, 52B are formed on both sides in the ship's transverse direction Dw, between the ship's side 3A, 3B (ship's side shell plating 3s) and the bulkheads 51A, 51B. The ballast tank section 52A on one side in the ship's transverse direction Dw is formed between the ship's side 3A and the bulkhead 51A, between the lower bottom deck 6 and the upper upper deck 5. The ballast tank section 52B on the other side in the ship's transverse direction Dw is formed between the ship's side 3B and the bulkhead 51B, between the lower bottom deck 6 and the upper upper deck 5. Ballast water (not shown) is poured into the ballast tank sections 52A, 52B. Note that a portion of the inner ballast tank portions 52A, 52B may be used as a pipe space through which piping and wiring are inserted, without filling the ballast water therein.

[0021] The cargo holds 53 are provided in each of the compartments S2 to S6 arranged in the central portion 2c in the fore-and-aft direction FA as cargo compartments. The cargo holds 53 accommodate (store) liquefied gases such as LPG (Liquefied Petroleum Gas), LNG (Liquefied Natural Gas), and ammonia as cargo. The cargo holds 53 are formed between the lower bottom deck 6 and the upper upper deck 5, on the inside of the pair of bulkheads 51A, 51B in the ship's transverse direction Dw. The cargo hold 53 has upper inclined plates 531A, 531B and lower inclined plates 532A, 532B. The upper inclined plates 531A, 531B extend obliquely upward from the pair of bulkheads 51A, 51B toward the inside of the ship's transverse direction Dw. The lower ends of the upper inclined plates 531A, 531B are joined above the middle of the pair of bulkheads 51A, 51B in the vertical direction Dv. The upper ends of the upper inclined plates 531A, 531B are joined outside the center of the upper deck 5 in the width direction Dw.

[0022] The lower inclined plates 532A, 532B extend obliquely downward from the pair of bulkheads 51A, 51B toward the inside in the ship's width direction Dw. The upper ends of the lower inclined plates 532A, 532B are joined below the middle parts of the pair of bulkheads 51A, 51B in the up-down direction Dv. The lower ends of the lower inclined plates 532A, 532B are joined outside the center part of the bottom deck 6 in the ship's width direction Dw.

[0023] The lower end of the upper inclined plate 531A and the upper end of the lower inclined plate 532A are disposed at a distance in the up-down direction Dv, and the lower end of the upper inclined plate 531B and the upper end of the lower inclined plate 532B are disposed at a distance in the up-down direction Dv. As a result, when the cargo hold 53 is viewed from inside in the ship's transverse direction Dw, a portion 51c of the bulkhead 51A is exposed between the lower end of the upper inclined plate 531A and the upper end of the lower inclined plate 532A, and a portion 51c of the bulkhead 51B is exposed between the lower end of the upper inclined plate 531B and the upper end of the lower inclined plate 532B. In other words, the portion 51c of the bulkhead 51A forms a portion of the cargo hold 53 on one side in the ship's transverse direction Dw, and the portion 51c of the bulkhead 51B forms a portion of the cargo hold 53 on the other side in the ship's transverse direction Dw.

[0024] Furthermore, the upper end of the upper inclined plate 531A and the upper end of the upper inclined plate 531B are arranged at an interval in the ship's transverse direction Dw, and as viewed from inside the cargo hold 53, a portion 5c of the upper deck 5 in the ship's transverse direction Dw is exposed between the upper end of the upper inclined plate 531A and the upper end of the upper inclined plate 531B. Similarly, the lower end of the lower inclined plate 532A and the lower end of the lower inclined plate 532B are arranged at an interval in the ship's transverse direction Dw. As viewed from inside the cargo hold 53, a portion 5c of the upper deck 5 in the ship's transverse direction Dw is exposed between the lower end of the lower inclined plate 532A and the lower end of the lower inclined plate 532B. In other words, the portion 5c of the upper deck 5 forms a portion of the cargo hold 53 above in the vertical direction Dv, and the portion 6c of the bottom deck 6 forms a portion of the cargo hold 53 below in the vertical direction Dv.

[0025] As shown in FIG. 3, as viewed from the fore-and-aft direction FA, the inner ballast tank section 54 is formed between the cargo hold 53 and a pair of bulkheads 51A, 51B. The inner ballast tank sections 54 are formed on both sides of the upper part of the cargo hold 53 in the ship's transverse direction Dw and on both sides of the lower part of the cargo hold 53 in the ship's transverse direction Dw. The inner ballast tank sections 54A, 54B formed on both sides of the upper part of the cargo hold 53 in the ship's transverse direction Dw are surrounded by upper inclined plates 531A, 531B, bulkheads 51A, 51B, and the upper deck 5. The inner ballast tank sections 54C, 54D formed on both sides of the lower part of the cargo hold 53 in the ship's transverse direction Dw are surrounded by lower inclined plates 532A, 532B, bulkheads 51A, 51B, and the bottom deck 6. Ballast water (not shown) is poured into the inner ballast tank sections 54A to 54D. Note that some of the inner ballast tank sections 54A to 54D may not be filled with ballast water, but may be used as pipe spaces through which piping and wiring are inserted.

[0026] (Action and effect) In the ship 1A of the above embodiment, among the multiple compartments S arranged within the hull 2, only the sections corresponding to the compartments S2 to S6 arranged in the central portion 2c in the fore-aft direction FA are provided with a side double structure 50A, excluding the compartments S7 and S1 closest to the bow 2a and the stern 2b. The side double structure 50A has a pair of bulkheads 51A and 51B arranged inside the pair of side walls 3A and 3B in the ship's width direction Dw. By providing the pair of side walls 3A and 3B and the pair of bulkheads 51A and 51B in the central portion 2c in the fore-aft direction FA, the rigidity of the central portion 2c in the fore-aft direction FA of the hull 2 ​​against a vertical bending moment is increased. This makes it possible to suppress deformation of the central portion 2c in the fore-aft direction FA upward relative to the bow 2a and stern 2b of the hull 2. Therefore, the ship 1A of the embodiment makes it possible to suppress a hogging vertical bending moment occurring in the hull 2.

[0027] In the above embodiment, the side double structure section 50A is provided with ballast tank sections 52A, 52B formed between the side sections 3A, 3B and the bulkheads 51A, 51B on both sides in the ship's width direction Dw. As a result, by storing ballast water in the ballast tank sections 52A, 52B on both sides in the ship's width direction Dw, it is possible to more effectively suppress deformation caused by the load of the ballast water, such as upward bending of the central section 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, it is possible to effectively suppress the hogging vertical bending moment generated in the hull 2.

[0028] In the above embodiment, a cargo hold 53 and an inner ballast tank portion 54 are further provided between the pair of bulkheads 51A and 51B. As a result, by storing ballast water in the inner ballast tank section 54, deformation such as upward bending of the central section 2c in the bow-stern direction FA relative to the bow 2a and stern 2b sides of the hull 2 ​​due to the load can be suppressed.

[0029] In the above embodiment, a bottom ballast tank section 58 is further provided between the bottom deck 6 and the ship bottom 4, and a pair of bulkheads 51A, 51B are formed on the bottom deck 6. This makes it possible to suppress deformation such as upward bending of the central section 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be suppressed.

[0030] In the above embodiment, the lower ends of the pair of bulkheads 51A, 51B are joined to the bottom deck 6, and the upper ends are joined to the upper deck 5. This more effectively increases the rigidity of the hull 2 ​​against the vertical bending moment at the central portion 2c in the fore-aft direction FA of the hull 2. Therefore, it is possible to more effectively suppress deformation such that the central portion 2c in the fore-aft direction FA of the hull 2 ​​bends upward relative to the bow 2a and stern 2b sides.

[0031] Second Embodiment Next, a second embodiment of a vessel according to the present disclosure will be described. Since the second embodiment differs from the first embodiment only in the configuration of the vessel, the same parts as those in the first embodiment will be denoted by the same reference numerals and redundant description will be omitted. (Overall configuration of the ship) As shown in FIG. 4, a vessel 1B of the second embodiment is a tanker, and includes at least a hull 2, a plurality of compartments S, a fuel tank 10, and a double-structure ship side portion 50B.

[0032] The side double-structure section 50B is formed only in the sections corresponding to the sections S2 to S6 arranged in the central part 2c in the fore-aft direction FA, excluding section S7 of the multiple sections S1 to S7 closest to the bow 2a and section S1 closest to the stern 2b. The side double-structure section 50B increases the strength of the hull 2 ​​against the hogging vertical bending moment. The side double-structure section 50B comprises a pair of bulkheads 51C, 51D, ballast tank sections 52C, 52D, a cargo tank 61, and an inner ballast tank section 62.

[0033] The pair of bulkheads 51C, 51D are arranged with a gap between them on the inside in the ship's width direction Dw relative to the pair of ship sides 3A, 3B. The lower end of each of the bulkheads 51C, 51D is joined to the ship's bottom 4. Each of the bulkheads 51C, 51D rises upward in the vertical direction Dv from the ship's bottom 4. The upper end of each of the bulkheads 51C, 51D is joined to an upper deck 5, which serves as an upper deck formed above the ship's bottom 4 in the vertical direction Dv.

[0034] The ballast tank sections 52C, 52D are formed on both outer sides of the pair of bulkheads 51C, 51D in the ship's transverse direction Dw. The ballast tank sections 52C, 52D are formed on both sides in the ship's transverse direction Dw, between the ship's side walls 3A, 3B and the bulkheads 51C, 51D. The ballast tank section 52C on one side in the ship's transverse direction Dw is formed between the ship's bottom 4 below and the upper deck 5 above, between the ship's side wall 3A and the bulkhead 51C. The ballast tank section 52D on the other side in the ship's transverse direction Dw is formed between the ship's bottom 4 below and the upper deck 5 above, between the ship's side wall 3B and the bulkhead 51D. Ballast water (not shown) is poured into the ballast tank sections 52C, 52D.

[0035] The cargo tanks 61 are provided in each of the compartments S2 to S6, which serve as cargo compartments, located in the central portion 2c in the fore-aft direction FA. The cargo tanks 61 store various liquids as cargo. The cargo tanks 61 are located inside the pair of bulkheads 51C, 51D in the ship's width direction Dw. The cargo tanks 61 are supported from below by the ship's bottom 4 via support members (not shown).

[0036] The inner ballast tank section 62 is formed between the cargo tank 61 and the pair of bulkheads 51C, 51D, between the ship bottom 4 and the upper deck 5. In other words, the inner ballast tank section 62 is formed below the cargo tank 61 and on both sides of the cargo tank 61 in the ship's width direction Dw. Ballast water (not shown) is poured into the inner ballast tank section 62. Note that a pipe space through which piping and wiring can be inserted may be provided in part of the inner ballast tank section 62.

[0037] (Action and effect) In the ship 1B of the second embodiment, similarly to the first embodiment described above, a pair of ship sides 3A, 3B and a pair of bulkheads 51C, 51D are provided in the central portion 2c in the fore-aft direction FA, thereby increasing the rigidity of the central portion 2c in the fore-aft direction FA of the hull 2 ​​against the vertical bending moment. This makes it possible to suppress deformation such that the central portion 2c in the fore-aft direction FA bends upward relative to the bow 2a and stern 2b sides of the hull 2. Therefore, according to the ship 1B of the embodiment, it is possible to suppress the hogging vertical bending moment occurring in the hull 2.

[0038] Furthermore, in the second embodiment, the pair of bulkheads 51C, 51D are formed to extend upward from the bottom 4. Even in this case, the pair of bulkheads 51C, 51D can suppress deformation such as upward bending of the central portion 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be suppressed.

[0039] (Modification of the second embodiment) In the second embodiment, a tanker is used as an example of the ship 1B, but the ship is not limited to this. For example, as shown in FIG. 5, if the ship 1C is a container ship, a cargo hold 71 may be provided between a pair of bulkheads 51C, 51D in the ship's side double-structure section 50C instead of the cargo tank 61 described in the second embodiment. The cargo hold 71 is provided in each of the compartments S2 to S6 arranged in the central section 2c in the fore-aft direction FA. The cargo hold 71 accommodates a plurality of containers as cargo. The cargo hold 71 is arranged inside the pair of bulkheads 51C, 51D in the ship's beam direction Dw. The cargo hold 71 is supported from below by the ship's bottom 4 via support members (not shown).

[0040] A pair of walls 74A, 74B are provided between the bottom of the cargo hold 71 and the bottom 4 of the ship, spaced apart in the ship's width direction Dw. The space surrounded by the bottom of the cargo hold 71, the bottom 4 of the ship, and the pair of walls 74A, 74B may be a pipe space 75 through which piping and wiring are inserted.

[0041] The inner ballast tank sections 72A, 72B of the side double structure section 50C are formed between the cargo hold 71 and a pair of bulkheads 51C, 51D, between the ship bottom 4 and the upper deck 5. The inner ballast tank section 72A is formed between the cargo hold 71 and bulkhead 51C, and the inner ballast tank section 72B is formed between the cargo hold 71 and bulkhead 51D. These inner ballast tank sections 72A, 72B are formed on both outer sides of the pipe space 75 in the ship's transverse direction Dw and on both outer sides of the cargo hold 71 in the ship's transverse direction Dw. Ballast water (not shown) is poured into these inner ballast tank sections 72A, 72B.

[0042] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the fuel tank 10 is disposed on the upper deck 5 on the stern 2b side, but this is not limitative. The fuel tank 10 may be disposed in the portion of the stern 2b that includes the section S1 (engine room) closest to the stern 2b. For example, as shown in FIG. 6, in the rear area Ab, a fuel tank 10B may be disposed in a part of the compartment S2 in the fore-and-aft direction FA. Also, as shown in FIG. 7, in the rear region Ab, a part of the compartment S2 in the up-down direction Dv may be used as a fuel tank 10C.

[0043] In the above embodiment, the side double-layered structures 50A-50C equipped with bulkheads 51A-51D are provided in all of the compartments S2-S6 located in the central portion 2c in the fore-aft direction FA, excluding the compartment S7 closest to the bow 2a and the compartment S1 closest to the stern 2b. However, this is not limited to this. The side double-layered structures 50A-50C may be provided in at least some of the compartments S2-S6 located in the central portion 2c in the fore-aft direction FA, excluding the compartment S7 closest to the bow 2a and the compartment S1 closest to the stern 2b. For example, the side double-layered structures 50A-50C may be provided in only compartment S4, only compartments S4 and S5, or only compartments S3-S5 of the compartments S2-S6 located in the central portion 2c in the fore-aft direction FA. Furthermore, the side double structure sections 50A to 50C may be arranged intermittently, for example, only in the sections S2, S4, and S6 among the sections S2 to S6 arranged in the central section 2c in the fore-aft direction FA.

[0044] In addition, in the above embodiment, the upper ends of the bulkheads 51A to 51D are joined to the upper deck 5 as the upper deck, but this is not limited to this. The upper ends of the bulkheads 51A to 51D may also be joined to an upper deck other than the upper deck 5 formed above the bottom 4 of the ship, for example, to another deck formed below the upper deck 5. Furthermore, in the above embodiment, the five sections S2 to S6 are used as cargo sections, but the number of sections S used as cargo sections may be five or more or less than five.

[0045] <Additional Notes> The ships 1A to 1C described in each embodiment can be understood, for example, as follows.

[0046] (1) The ships 1A to 1C according to the first aspect comprise a hull 2 ​​having a pair of side walls 3A, 3B and a bottom 4, a plurality of compartments S arranged in the fore-aft direction FA within the hull 2, and fuel tanks 10, 10B, 10C arranged at the rear of the hull 2, and the hull 2 ​​is provided with side double structure sections 50A to 50C which are formed only in a portion corresponding to at least one of the compartments S2 to S6 arranged in the central part 2c in the fore-aft direction FA, excluding the compartments S7 and S1 which are closest to the bow 2a and the stern 2b among the plurality of compartments S1 to S7, and which have a pair of bulkheads 51A, 51B, 51C, 51D arranged inward in the ship's beam direction Dw relative to the pair of side walls 3A, 3B.

[0047] This makes it possible to suppress deformation such as upward bending of the central portion 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be suppressed.

[0048] (2) The ships 1A to 1C according to the second aspect are the ships 1A to 1C of (1), and the side double structure sections 50A to 50C are provided with ballast tank sections 52A, 52B, 52C, 52D formed between the side sections 3A, 3B and the bulkheads 51A, 51B, 51C, 51D on both sides of the ship's width direction Dw.

[0049] This allows ballast water to be stored in the ballast tank sections 52A, 52B, 52C, 52D on both sides in the ship's width direction Dw, making it possible to more effectively prevent deformation caused by the load of the ballast water, such as upward bending of the central section 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be effectively suppressed.

[0050] (3) The ships 1A to 1C according to the third aspect are the ships 1A to 1C of (1) or (2), and further include inner ballast tank sections 54, 62, 72A, 72B formed on the inside of the pair of bulkheads 51A, 51B, 51C, 51D in the ship's width direction Dw.

[0051] This allows ballast water to be stored in the inner ballast tank sections 54, 62, 72A, 72B formed inside the pair of bulkheads 51A, 51B, 51C, 51D in the ship's width direction Dw, thereby suppressing deformation such as upward bending of the central section 2c in the bow-stern direction FA toward the bow 2a and stern 2b sides of the hull 2.

[0052] (4) The ship 1A according to the fourth aspect is any one of the ships 1A of (1) to (3), wherein the hull 2 ​​comprises a bottom deck 6 formed at a distance above the bottom 4 in the vertical direction, and a bottom ballast tank section 58 formed between the bottom deck 6 and the bottom 4, and the pair of bulkheads 51A, 51B are formed extending upward from the bottom deck 6.

[0053] As a result, when a bottom ballast tank section 58 is provided between the bottom deck 6 and the ship bottom 4, forming a pair of bulkheads 51A, 51B on the bottom deck 6 can suppress deformation such that the central section 2c in the fore-aft direction FA bends upward relative to the bow 2a and stern 2b sides of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be suppressed.

[0054] (5) The ships 1B, 1C according to a fifth aspect are the ships 1B, 1C of any one of (1) to (3), in which the pair of bulkheads 51C, 51D are formed to extend upward from the bottom 4 of the ship.

[0055] As a result, even when the pair of bulkheads 51C, 51D are formed to extend upward from the bottom 4, the pair of bulkheads 51C, 51D can suppress deformation such as upward bending of the central portion 2c in the fore-aft direction FA relative to the bow 2a and stern 2b of the hull 2. As a result, the hogging vertical bending moment generated in the hull 2 ​​can be suppressed.

[0056] (6) The ships 1A to 1C according to the sixth aspect are the ships 1A to 1C of (4), in which the upper ends of the pair of bulkheads 51A, 51B, 51C, 51D are joined to an upper deck 5 formed above the bottom deck 6 in the vertical direction. The upper deck may be the upper deck or another deck located below the upper deck.

[0057] (7) The ships 1A to 1C according to the seventh aspect are the ships 1A to 1C of (5), in which the upper ends of the pair of bulkheads 51A, 51B, 51C, 51D are joined to an upper deck 5 formed above the bottom 4 in the vertical direction.

[0058] As a result, the lower ends of the pair of bulkheads 51A, 51B, 51C, 51D are joined to the bottom deck 6 or the bottom 4, and the upper ends are joined to the upper deck 5, thereby more effectively improving the structure of the hull 2 ​​at the central part 2c in the fore-aft direction FA of the hull 2. Therefore, deformation such as upward bending of the central part 2c in the fore-aft direction FA relative to the bow 2a side and the stern 2b side of the hull 2 ​​can be more effectively suppressed. [Explanation of symbols]

[0059] 1A-1C...Vessel 2...Hull 2a...Bow 2b...Stern 2c...Central section 3A, 3B...Side 3s...Side shell plating 4...Bottom 4s...Bottom shell plating 5...Upper deck (upper deck) 5c...Part 6...Bottom deck 6c...Part 7...Superstructure 8...Propeller 10, 10B, 10C...Fuel tank 11, 11A...Compartment wall 21...Prime motor 50A-50C...Side double structure section 51A, 51B, 51C, 51D...Bulkhead 51c...Part 52A, 52B, 52C, 52D...Ballast tank section 53...Cargo hold 54, 54A, 54B, 54C, 54D...Inner ballast tank section 58...Bottom ballast tank section 61...Cargo tank 62...Inner ballast tank section 71...Cargo hold 72A, 72B...Inner ballast tank section 74A, 74B...Wall 75...Pipe space 531A, 531B...Upper inclined plate 532A, 532B...Lower inclined plate S, S1 to S7...Compartments

Claims

1. a hull having a pair of sides and a bottom; A plurality of compartments arranged in a bow-stern direction within the hull; a fuel tank disposed in a rear region of the hull, which is an aft portion including the aftmost compartment to the second aftmost compartment among the plurality of compartments; Equipped with The hull is a side double structure section formed only in portions corresponding to all of the compartments arranged in the center in the bow-stern direction, excluding the compartments on the bow-most and stern-most sides of the multiple compartments, and having a pair of bulkheads arranged inside in the ship's width direction relative to the pair of side walls; The side double structure section has ballast tank sections formed between the side and the bulkhead on both sides in the ship width direction. ship.

2. The ship further includes an inner ballast tank portion formed on the inside of the pair of bulkheads in the ship width direction.

2. The watercraft of claim 1.

3. The hull is A bottom deck formed above the bottom of the ship in a vertical direction and spaced apart from the bottom of the ship; a bottom ballast tank portion formed between the bottom deck and the bottom of the vessel, The pair of bulkheads are formed extending upward from the bottom deck.

3. A vessel according to claim 1 or 2.

4. The pair of bulkheads are formed to extend upward from the bottom of the vessel.

3. A vessel according to claim 1 or 2.

5. The upper ends of the pair of bulkheads are joined to an upper deck formed above the bottom deck in the vertical direction.

4. The watercraft of claim 3.

6. The upper ends of the pair of bulkheads are joined to an upper deck formed above the bottom of the ship in the vertical direction.

5. A watercraft according to claim 4.

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