Ship

Abstract

This ship is provided with a hull, a first watertight deck, a nacelle region, a tank chamber, and a second watertight deck. The hull has a pair of sides and a hull bottom. The first watertight deck is arranged in the ship body. The first watertight deck is provided as a vehicle loading deck that divides the interior of the hull into an upper layer region and a lower layer region. The nacelle region is provided in the lower layer region and accommodates a combustion device for combusting a combustion material. The tank chamber is provided in the lower layer region and stores a fuel tank that stores fuel for use by the combustion device. The second watertight deck is arranged in the lower layer area. The second watertight deck is provided as a vehicle deck that forms a watertight section at the upper part of the lower layer region together with the first watertight deck.

Description

Technical Field

[0001] The present invention relates to a ship.

[0002] This application claims priority from Japanese Patent Application No. 2022-207093 filed in Japan on December 23, 2022, and incorporates its content herein. Background Art

[0003] Vessels such as ferries, RORO (Roll-on / Roll-off ships), and PCTC (Pure Car & Truck Carriers) have vehicle decks inside the hull that can accommodate multiple vehicles. In such vessels, partitions that impede the passage of vehicles on the vehicle deck are minimized as much as possible to ensure a spacious vehicle loading space on the vehicle deck.

[0004] In such vessels, furthermore, in preparation for the event of flooding, watertight decks are provided inside the hull. For example, in Patent Document 1, a structure including a watertight deck (freeboard deck), a watertight upper cover, and watertight doors is disclosed. The watertight deck is disposed inside the hull. The watertight upper cover opens and closes the vehicle passage from the in-hull ramp to the freeboard deck. The watertight door closes the vehicle passage from the in-hull ramp to the lower vehicle deck.

[0005] With this structure, in the event of flooding occurring at a position below the watertight compartment, the hull is prevented from sinking by the buoyancy above the watertight compartment inside the hull. Also, the water that has entered the hull below the watertight compartment functions as ballast, contributing to ensuring the stability of the hull during flooding.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2014-84043 Summary of the Invention

[0009] Technical Problem to be Solved by the Invention

[0010] However, in vessels equipped with vehicle decks, natural gas or ammonia is sometimes used as fuel. In such vessels, in order to store natural gas or ammonia, large fuel tanks are sometimes provided below the freeboard deck inside the hull. In this case, the volume inside the hull below the watertight compartment is occupied by the fuel tanks, and in the event of flooding, the amount of water that enters the hull below the watertight compartment decreases. As a result, the amount of water that functions as ballast decreases, and the buoyancy of the lower part of the hull relative to the watertight compartment increases, so the stability of the hull during flooding sometimes becomes low.

[0011] The present invention is completed to solve the above problems, and an object thereof is to provide a ship capable of improving the hull stability in the event of flooding.

[0012] Means for Solving the Technical Problem

[0013] To solve the above problems, the ship according to the present invention includes a hull, a first watertight deck, an engine room area, a storage tank room, and a second watertight deck. The hull has a pair of sides and a bottom. The first watertight deck is provided inside the hull. The first watertight deck is provided as a vehicle loading deck, and the vehicle loading deck divides the inside of the hull into an upper area and a lower area. The engine room area is provided in the lower area and houses a combustion device for burning fuel. The storage tank room is provided in the lower area and stores fuel tanks, and the fuel tanks store fuel for use by the combustion device. The second watertight deck is provided in the lower area. The second watertight deck is provided as a vehicle deck that forms a watertight partition together with the first watertight deck at the upper part of the lower area.

[0014] Advantages of the Invention

[0015] According to the ship of the present invention, the hull stability in the event of flooding can be improved. Description of the Drawings

[0016] Figure 1 is a side view of the ship according to the embodiment of the present invention.

[0017] Figure 2 is a cross-sectional view of the ship according to the embodiment of the present invention as viewed from the bow-stern direction.

[0018] Figure 3 is a cross-sectional view showing the structure of the storage tank room in the ship according to the embodiment of the present invention.

[0019] Figure 4 is a cross-sectional view showing the structure on the second watertight deck in the ship according to the embodiment of the present invention.

[0020] Figure 5 is a cross-sectional view showing the structure on the second watertight deck in a modified example of the ship according to the embodiment of the present invention. Detailed Embodiment

[0021] Hereinafter, with reference to Figures 1 to 5 , the ship according to the embodiment of the present invention will be described.

[0022] As Figure 1As shown, the ship 1 of the embodiment of the present invention includes a hull 2, an engine room area 20, a storage tank room 40, a first watertight deck 11, and a second watertight deck 12. The ship type of the ship 1 is not limited to a specific ship type as long as it can carry vehicles. Regarding the ship type of the ship 1, for example, ferry, RORO (Roll-on / Roll-off ship), PCTC (Pure Car& Truck Carrier), etc. can be exemplified.

[0023] Figure 2 It is a cross-sectional view of the ship according to the embodiment of the present invention observed from the bow-stern direction.

[0024] As Figure 1 , Figure 2 shown, the hull 2 has a pair of side hulls 3A, 3B and a bottom 4 that form its outer shell. The side hulls 3A, 3B are composed of a pair of side outer plates that respectively form the left and right side hulls. The bottom 4 is composed of a bottom outer plate that connects these side hulls 3A, 3B. The outer shell of the hull 2 formed by these pair of side hulls 3A, 3B and the bottom 4 is U-shaped in a cross-section orthogonal to the bow-stern direction FA.

[0025] The hull 2 has multiple decks inside it, and the multiple decks include the freeboard deck and the upper deck 8 that are the first watertight deck 11. The first watertight deck 11 (freeboard deck) in this embodiment is the lowermost continuous deck among the continuous decks arranged above the full load waterline. The first watertight deck 11 is the vehicle loading deck when vehicles drive into the hull 2 from the outside when docking. The upper deck 8 is the uppermost continuous deck among the continuous decks.

[0026] At least a part of the multiple decks is set as a vehicle deck 7. Multiple vehicles can be loaded on the vehicle deck 7. In the embodiment of the present invention, multiple layers of the vehicle deck 7 are provided at intervals in the vertical direction. In the embodiment of the present invention, multiple layers of the vehicle deck 7 are provided below the first watertight deck 11. In addition, in the embodiment of the present invention, the lowermost vehicle deck 7 among the multiple layers of the vehicle deck 7 that is closest to the bottom 4 is called the vehicle deck 7A.

[0027] As Figure 1As shown, a part of the engine room area 20 is provided within the hull 2. The engine room area 20 is arranged on the stern 2b side in the fore-and-aft direction FA. In the present embodiment, the engine room area 20 includes an engine room 23 and a fuel preparation room 25. The engine room 23 and the fuel preparation room 25 are separated by an intermediate partition wall 22. The engine room 23 is formed on the side closer to the stern 2b in the fore-and-aft direction FA than the intermediate partition wall 22. Combustion devices 24 such as a main engine, an auxiliary engine, and an engine for a generator (all not shown) are accommodated in the engine room 23. In the present embodiment, the main engine, the auxiliary engine, and the engine for the generator as the combustion devices 24 are driven by, for example, LNG (liquefied natural gas) as fuel.

[0028] The fuel preparation room 25 is formed on the side closer to the bow 2a in the fore-and-aft direction FA than the intermediate partition wall 22. Equipment 27 such as a vaporizer (not shown) for vaporizing the fuel supplied from a fuel tank 50 described later is accommodated in the fuel preparation room 25.

[0029] Figure 3 It is a cross-sectional view showing the structure of a storage tank room in a ship according to an embodiment of the present invention. Figure 4 It is a cross-sectional view showing the structure on a second watertight deck in a ship according to an embodiment of the present invention.

[0030] As Figures 1 to 3 shown, the storage tank room 40 accommodates a fuel tank 50 capable of storing LNG therein. In the present embodiment, two fuel tanks 50 are arranged in parallel in the ship width direction Dw, which is the direction connecting a pair of side hulls 3A and 3B. Each fuel tank 50 is, for example, in a cylindrical shape extending in the horizontal direction. In the present embodiment, each fuel tank 50 is arranged to extend in the fore-and-aft direction FA. In addition, the fuel tank 50 is not limited to a cylindrical shape, and the fuel tank 50 may be spherical, square, or the like. Also, the number of fuel tanks 50 is not limited to two. For example, only one fuel tank 50 may be provided, or three or more fuel tanks 50 may be provided.

[0031] As Figure 1 、 Figure 4 shown, among a plurality of vehicle decks 7 provided at intervals in the vertical direction, a tank connection space 55 for connecting various pipes to the fuel tank 50 is provided on the vehicle deck 7D. In addition, the vehicle deck 7D is located at the uppermost layer among the multi-layer vehicle decks 7A to 7D, and the multi-layer vehicle decks are located in a lower region A2 below the first watertight deck 11.

[0032] The storage tank room 40 is a watertight compartment, and when viewed from the vertical direction Dv, it has a wall portion 41 formed so as to surround the periphery of the two fuel tanks 50 and a wall portion 41D formed so as to surround the periphery of the tank connection space 55.

[0033] The wall portion 41 has a pair of side walls 42A, 42B, a front wall 43A, and a rear wall 44A.

[0034] The pair of side walls 42A, 42B are provided at intervals in the ship width direction Dw. The side wall 42A is provided on the side closer to the side 3A in the ship width direction Dw, and the side wall 42B is provided on the side closer to the side 3B in the ship width direction Dw. Moreover, the side wall 42A is provided separated from the side 3A toward the inner side in the ship width direction Dw, and the side wall 42B is provided separated from the side 3B toward the inner side in the ship width direction Dw. The pair of side walls 42A, 42B respectively extend from the rear wall 44A toward the bow 2a side in the bow-stern direction FA. When viewed from the ship width direction Dw, the pair of side walls 42A, 42B are respectively formed to cover the entire two fuel tanks 50 from the ship width direction Dw. As described above, since the side walls 42A, 42B are separated from the sides 3A, 3B, the damage probability of the side walls 42A, 42B when the sides 3A, 3B are damaged is lowered.

[0035] The front wall 43A is provided to connect the ends of the pair of side walls 42A, 42B on the bow 2a side in the bow-stern direction FA to each other. When viewed from the bow 2a side in the bow-stern direction FA, the front wall 43A is formed to cover the entire two fuel tanks 50 from the bow 2a side.

[0036] The rear wall 44A is provided to connect the ends of the pair of side walls 42A, 42B on the stern 2b side in the bow-stern direction FA to each other. When viewed from the stern 2b side in the bow-stern direction FA, the rear wall 44A is formed to cover the entire two fuel tanks 50 from the stern 2b side.

[0037] When viewed from above, the two fuel tanks 50 are surrounded by a pair of side walls 42A, 42B, a front wall 43A, and a rear wall 44A.

[0038] The pair of side walls 42A, 42B, the front wall 43A, and the rear wall 44A constituting the wall portion 41 are formed to stand upright upward from the lowermost vehicle deck 7A. The upper ends of the pair of side walls 42A, 42B, the front wall 43A, and the rear wall 44A are respectively connected to the lower surface of the uppermost vehicle deck 7D among the plurality of vehicle decks 7A to 7D.

[0039] In the wall portion 41 of the storage tank room 40, the vehicle decks 7B, 7C disposed between the lowermost vehicle deck 7A and the uppermost vehicle deck 7D are provided so as to penetrate in the vertical direction Dv. In the portions of the vehicle decks 7B, 7C surrounded by the wall portion 41, openings 71B, 71C penetrating in the vertical direction Dv are formed. In other words, when viewed from above, the vehicle decks 7B, 7C are not provided inside the wall portion 41, but are only provided outside the wall portion 41.

[0040] Each fuel tank 50 is provided, for example, on the lowermost vehicle deck 7A via a support base (not shown). In the present embodiment, each fuel tank 50 is disposed below the vehicle deck 7D, which is the uppermost one among the multiple vehicle decks 7A to 7D provided at intervals in the vertical direction. Each fuel tank 50 is provided to straddle multiple levels in the vertical direction Dv through openings 71B and 71C formed in the multiple vehicle decks 7B and 7C.

[0041] The wall portion 41D forms a storage tank chamber 40 on the uppermost vehicle deck 7D. The wall portion 41D is formed to surround the periphery of the tank connection space 55. Thus, the wall portion 41D provided on the uppermost vehicle deck 7D is constituted by the above-mentioned side walls 42A and 42B, the rear wall 44A, and the front wall 43D. That is, the wall portion 41 and the wall portion 41D in the present embodiment differ only in the arrangement of the front wall 43A and the front wall 43D. The front wall 43D is disposed on the side closer to the stern 2b in the bow-stern direction FA than the front wall 43A of the wall portion 41 at the levels provided on the vehicle decks 7A to 7C.

[0042] As Figure 4 shown, a front wall 43D and partition walls 48A and 48B that enclose the section between a pair of side hulls 3A and 3B are provided on the uppermost vehicle deck 7D. One partition wall 48A encloses the space between the front wall 43D and one side hull 3A. The other partition wall 48B encloses the space between the front wall 43D and the other side hull 3B.

[0043] As Figure 1 、 Figure 2 shown, the inner side of the hull 2 is partitioned by the first watertight deck 11 into an upper region A1 that is above the first watertight deck 11 and a lower region A2 that is below the first watertight deck 11. The above-mentioned engine room area 20 and the storage tank chamber 40 are provided in the lower region A2.

[0044] The second watertight deck 12 is provided in the lower region A2. The second watertight deck 12 is provided on the lower side with respect to the first watertight deck 11. In the embodiment of the present invention, the second watertight deck 12 is the vehicle deck 7D, which is the uppermost one among the multiple vehicle decks 7A to 7D arranged at intervals in the vertical direction Dv in the lower region A2. In other words, the second watertight deck 12 is the vehicle deck 7D disposed directly below the first watertight deck 11. Except for the tank connection space 55, the fuel tanks 50 in the present embodiment are located below the second watertight deck 12.

[0045] The first watertight deck 11 and the second watertight deck 12 are provided with openings such as lashing strap holes (not shown) for lashing lashing straps for fixing vehicles and stairwells (not shown). In order to ensure watertightness, the openings are configured to be closable by appropriate covers or the like. Regarding the lashing strap holes, for example, a structure can be exemplified in which the entire hole is closed by welding a concave metal part from the back side of the deck. And, regarding the opening of the stairwell for traveling between the respective levels, it can be exemplified that it can be opened and closed by a watertight door or the like.

[0046] And, as Figure 4 shown, in the present embodiment, a vehicle passage 120, which is a slope from the second watertight deck 12 to another vehicle deck 7C located below the second watertight deck 12, is provided. Therefore, a watertight door 125 capable of closing the vehicle passage 120 is provided on the second watertight deck 12.

[0047] As Figure 1 、 Figure 4 shown, the second watertight deck 12 of the present embodiment is formed on the side of the bow 2a closer to the fore-and-aft direction FA than the front wall 43D and the partition walls 48A, 48B.

[0048] Between the first watertight deck 11 and the second watertight deck 12, the side from the stern 2b side in the fore-and-aft direction FA is closed by the front wall 43D and the partition walls 48A, 48B. Thus, a watertight compartment Aw is formed above the lower region A2 by being surrounded by the first watertight deck 11, the second watertight deck 12, a pair of side hulls 3A, 3B, the front wall 43D, and the partition walls 48A, 48B inside the hull 2. In addition, in the present embodiment, the side closer to the stern 2b in the fore-and-aft direction FA than the front wall 43D and the partition walls 48A, 48B is provided as a fuel preparation room 25.

[0049] For example, when the hull 2 is damaged at a position lower than the second watertight deck 12, the lower region A2 below the second watertight deck 12 will be flooded. At this time, as Figure 2 shown, the second watertight deck 12 is disposed at a position lower than the damage waterline Lc when the lower region A2 is flooded to the maximum extent. And the first watertight deck 11 is disposed at a position higher than the damage waterline Lc.

[0050] (Function and Effect)

[0051] The ship 1 of the above-described embodiment includes the first watertight deck 11 that serves as a vehicle loading deck for partitioning the inside of the hull 2 into the upper region A1 and the lower region A2, and the second watertight deck 12 provided in the lower region A2. A watertight compartment Aw is formed above the lower region A2 by these first watertight deck 11 and second watertight deck 12.

[0052] Thus, at a position below the second watertight deck 12, if the hull 2 is damaged and water enters the lower area A2, the ingress of water to a position above the second watertight deck 12 is suppressed. By the air in the upper area A1 above the first watertight deck 11 and the watertight compartment Aw formed by the first watertight deck 11 and the second watertight deck 12, buoyancy can act on the hull 2.

[0053] When a storage tank room 40 is provided in the lower area A2 in addition to the engine room area 20, the volume of the lower area A2 below the second watertight deck 12 is reduced, and the amount of water entering the lower area A2 is also relatively small. Therefore, the draft becomes shallower, and when water enters, the effect of the water entering the lower part of the hull 2 acting like a ballast to improve the stability of the hull 2 is weakened. For example, in the case where the second watertight deck 12 is not provided, as Figure 2 shown by the damaged draft line Lc2, there is a high possibility that the hull 2 will tilt significantly.

[0054] In contrast, in the ship 1 of the present embodiment, the buoyancy of the watertight compartment Aw between the first watertight deck 11 and the second watertight deck 12 can be effectively utilized. Therefore, even when the hull 2 is most tilted, the tilt can be reduced to the tilt degree of the damaged draft line Lc. As a result, the stability of the hull 2 in the event of water ingress can be improved.

[0055] Moreover, since the second watertight deck 12 is the vehicle deck 7, there are fewer bulkheads provided on the vehicle deck 7, and a watertight compartment Aw can be formed over a wide range on the vehicle deck 7. Therefore, the buoyancy generated by the air in the watertight compartment Aw acts in a range widely extending in the fore-and-aft direction FA and the ship width direction Dw when viewed from above, and this also effectively contributes to improving the stability of the hull 2 at this point.

[0056] Furthermore, in the above-described embodiment, when the hull 2 is damaged and water enters the lower area A2, the second watertight deck 12 is arranged at a position below the damaged draft line Lc. Thus, the buoyancy generated by the air in the watertight compartment Aw between the first watertight deck 11 and the second watertight deck 12 can further suppress the tilt of the hull 2 and make it stable.

[0057] Moreover, in the above-described embodiment, the first watertight deck 11 is arranged at a position above the damaged draft line Lc. Thus, the ingress of water to the upper area A1 above the first watertight deck 11 can be more reliably suppressed.

[0058] Further, in the above-described embodiment, the second watertight deck 12 is provided as the vehicle deck 7D, which is located at the uppermost position among the plurality of vehicle decks 7. Thus, in the lower region A2, the volume inside the hull 2 below the second watertight deck 12 as large as possible is ensured. When water enters, the stability of the hull 2 can be improved by increasing the amount of water flowing into the lower region A2.

[0059] Further, in the above-described embodiment, when the vehicle passage 120 is provided on the second watertight deck 12, the vehicle passage 120 is closed by the watertight door 125, whereby the watertightness of the second watertight deck 12 can be easily ensured.

[0060] Further, in the above-described embodiment, the fuel tank 50 is located at a position lower than the second watertight deck 12. Therefore, compared with the case where the fuel tank 50 extends above the second watertight deck 12, the position of the center of gravity of the hull 2 can be lowered. Therefore, the stability of the hull 2 can be further improved.

[0061] (Other embodiments)

[0062] As described above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and also includes design changes and the like within the scope not departing from the gist of the present invention.

[0063] In addition, in the above-described embodiment, it is provided with two fuel tanks 50, but the shape, the number of installations, the configuration, etc. thereof can be appropriately changed.

[0064] Further, in the above-described embodiment, the storage tank room 40 is provided throughout the entire layer on the vehicle decks 7A to 7D, but the number of these layers can be appropriately changed.

[0065] Further, in the above-described embodiment, on the uppermost vehicle deck 7D, the wall portion 41D of the storage tank room 40 surrounding the tank connection space 55 is arranged at the center portion in the ship width direction Dw, but it is not limited thereto. For example, as Figure 5 shown, the wall portion 41E of the storage tank room 40 surrounding the tank connection space 55 can be brought closer to one side in the ship width direction Dw to be connected to any one of the side hulls 3A. In this case, the partition wall 48C for closing the area between the wall portion 41E and the other side hull 3B can be arranged on the stern 2b side in the fore-and-aft direction FA with respect to the front wall 43D. In this case, a part 12e of the second watertight deck 12 extends toward the side closer to the stern 2b in the fore-and-aft direction FA between the wall portion 41E and the other side hull 3B.

[0066] In addition, the tank connection space 55 is not limited to the uppermost vehicle deck 7D. For example, it can also be arranged on other layers such as the vehicle decks 7A to 7C.

[0067] Further, in the above-described embodiment, it is assumed that the first watertight deck 11 and the second watertight deck 12 are provided inside the hull 2, but it may also be assumed that other watertight decks are provided in the upper area A1 above the first watertight deck 11. In addition, as long as the upper area A1 is a structure capable of obtaining buoyancy, it can be any structure. For example, multiple vehicle decks can be provided, or living quarters can also be provided.

[0068] In addition, the height between the first watertight deck 11 and the second watertight deck 12 can be greater than the height between other vehicle decks 7C and 7B.

[0069] <Supplementary Note>

[0070] The ship 1 described in the embodiment can be understood as follows, for example.

[0071] (1) The ship 1 according to the first mode includes: a hull 2 having a pair of side hulls 3A and 3B and a bottom 4;

[0072] A first watertight deck 11 provided inside the hull 2 as a vehicle loading deck, which divides the inside of the hull 2 into an upper area A1 and a lower area A2;

[0073] An engine room area 20 provided in the lower area A2 and accommodating a combustion device 24 for burning fuel;

[0074] A storage tank room 40 provided in the lower area A2 and storing a fuel tank 50 that stores fuel for use by the combustion device 24; and

[0075] A second watertight deck 12 provided in the lower area A2 and serving as a vehicle deck 7 that forms a watertight compartment Aw together with the first watertight deck 11 in the upper part of the lower area A2.

[0076] Thus, at a position below the second watertight deck 12, if the hull 2 is damaged and water enters the lower area A2, the ingress of water is suppressed to a position above the second watertight deck 12. Thus, by the air in the upper area A1 above the first watertight deck 11 and the watertight compartment Aw formed by the first watertight deck 11 and the second watertight deck 12, buoyancy acts on the hull 2. By providing the engine room area 20 and the storage tank room 40 in the lower area A2, the volume of the lower area A2 below the second watertight deck 12 is reduced, and the amount of water entering the lower area A2 is also reduced. Therefore, when water enters, the effect of the water entering the lower part of the hull 2 acting like ballast to improve the stability of the hull 2 is weakened, but the buoyancy generated by the air in the upper area A1 and the watertight compartment Aw increases. As a result, the stability of the hull 2 in the event of water ingress can be improved.

[0077] (2) The ship 1 according to the second mode is the ship 1 in (1), wherein the second watertight deck 12 is disposed at a position lower than the damaged draft line Lc in the case where the hull 2 is damaged and water floods into the lower area A2.

[0078] Thus, the buoyancy generated by the air in the watertight compartment Aw between the first watertight deck 11 and the second watertight deck 12 can suppress the further sinking of the hull 2.

[0079] (3) The ship 1 according to the third mode is the ship 1 in (1) or (2), wherein the first watertight deck 11 is disposed at a position higher than the damaged draft line Lc in the case where the hull 2 is damaged and water floods into the lower area A2.

[0080] Thus, it is possible to more reliably suppress the flooding of the upper area A1 above the first watertight deck 11.

[0081] (4) The ship 1 according to the fourth mode is any one of the ships 1 in (1) to (3). In the lower area A2, a plurality of vehicle decks 7 are provided at intervals in the vertical direction, and the second watertight deck 12 is provided as the vehicle deck 7 located at the uppermost position among the plurality of vehicle decks 7.

[0082] Thus, in the lower area A2, the volume inside the hull 2 below the large second watertight deck 12 is ensured. When flooded, by increasing the amount of water flowing into the lower area A2, the stability of the hull 2 can be improved.

[0083] (5) The ship 1 according to the fifth mode is the ship 1 in (4), and it further includes a watertight door 125 that closes the vehicle passage 120 leading to the other vehicle decks 7 located below the second watertight deck 12.

[0084] Thus, when the vehicle passage 120 is provided on the second watertight deck 12, the vehicle passage 120 is closed by the watertight door 125, and thus the watertightness of the second watertight deck 12 can be easily ensured.

[0085] (6) The ship 1 according to the sixth mode is the ship 1 in (4) or (5), wherein the fuel tank 50 is located at a position lower than the second watertight deck 12.

[0086] Thus, compared with the case where the fuel tank 50 extends above the second watertight deck 12, the position of the center of gravity of the hull 2 can be lowered, and thus the stability of the hull 2 can be improved.

[0087] Industrial Applicability

[0088] The ship according to the present invention can improve the stability of the hull in the event of flooding.

[0089] Symbol Explanation

[0090] 1 - Ship, 2 - Hull, 2a - Bow, 2b - Stern, 3A, 3B - Side, 4 - Bottom, 7, 7A to 7D - Vehicle deck, 8 - Upper deck, 11 - First watertight deck, 12 - Second watertight deck, 12e - Part, 20 - Engine room area, 22 - Intermediate bulkhead, 23 - Engine room, 24 - Combustion device, 25 - Fuel preparation room, 27 - Equipment, 40 - Storage tank room, 41, 41D, 41E - Wall part, 42A, 42B - Side wall, 43A, 43D - Front wall, 44A - Rear wall, 48A to 48C - Partition wall, 50 - Fuel tank, 55 - Tank connection space, 71B, 71C - Opening, 120 - Vehicle passage, 125 - Watertight door, A1 - Upper area, A2 - Lower area, Aw - Watertight compartment, Dv - Vertical direction, Dw - Ship width direction, FA - Bow - stern direction, Lc - Draft line after damage.

Claims

1. A ship, comprising: A hull having a pair of side hulls and a bottom; A first watertight deck provided as a vehicle loading deck within the hull, the vehicle loading deck partitioning the hull into an upper area and a lower area; An engine room area provided in the lower area and accommodating a combustion device for burning fuel; A storage tank room provided in the lower area and storing fuel tanks that store fuel for use by the combustion device; and A second watertight deck provided in the lower area and serving as a vehicle deck that forms a watertight partition together with the first watertight deck at the upper part of the lower area.

2. The ship according to claim 1, wherein, The second watertight deck is arranged at a position lower than the damaged waterline in the case of damage to the hull and flooding into the lower area.

3. The ship according to claim 1 or 2, wherein, The first watertight deck is arranged at a position higher than the damaged waterline in the case of damage to the hull and flooding into the lower area.

4. The ship according to claim 1 or 2, wherein, In the lower area, a plurality of vehicle decks are provided at intervals in the vertical direction, The second watertight deck is provided as the uppermost one of the plurality of vehicle decks.

5. The ship according to claim 4, further comprising: Watertight doors that close vehicle passages leading to other vehicle decks located below the second watertight deck.

6. The ship according to claim 4, wherein, The fuel tanks are located at a position lower than the second watertight deck.

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