Vessel

Abstract

To enlarge a tank while securing necessary mooring area.SOLUTION: A vessel includes: a hull with a pair of broadsides; an upper deck provided on the hull; a tank provided in the hull and having an upper part which penetrates a center part in a vessel width direction of the upper deck and projects above the upper deck; a tank cover provided with space inside the vessel width direction to the pair of broadsides as well as having an apex flat surface which covers the plurality of tanks from above and extends in the vessel bow-stern direction; and a bow deck formed continuously from the apex flat surface to the bow side as well as extending over the vessel width direction between the pair of broadsides.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] A liquefied gas carrier has a tank capable of storing liquefied gas within the hull. The liquefied gas carrier has certain limitations on major specifications such as the ship's length and draft due to the facility requirements of the port where cargo handling takes place. In this situation, in order to increase the amount of liquefied gas carried on a liquefied gas carrier, the upper part of the tank is made to protrude upward by penetrating a part of the upper deck of the hull. Patent Document 1 discloses a configuration in which a tank cover is provided on the upper deck so as to cover from above the upper part of the tank protruding above the upper deck. Patent Document 1 also discloses a configuration in which a mooring machine is provided on the upper deck on the bow side of the tank cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-187190 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Patent Document 1, the mooring machine is arranged on the upper deck on the bow side of the tank cover. The tank cover is located at a higher position than the upper deck on the bow side where the mooring machine is arranged. For this reason, if the tank is made larger forward, the mooring area becomes narrower. Also, if the mooring area where the mooring equipment and the like are arranged is expanded rearward, the tank becomes smaller. Therefore, it is difficult to make the tank larger while securing the necessary mooring area.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a ship that can have a larger tank while securing the necessary mooring area. [Means for solving the problem]

[0006] In order to solve the above problems, a ship according to the present disclosure includes a hull, an upper deck, a tank, a tank cover, and a bow deck. The hull has a pair of ship sides. The upper deck is provided on the hull. The tank is provided within the hull. An upper portion of the tank penetrates a center portion of the upper deck in the ship width direction and protrudes upward from the upper deck. The tank cover is provided at a distance inward in the ship width direction from the pair of ship sides. The tank cover covers the multiple tanks from above and has a top flat surface extending in the bow-stern direction. The bow deck is formed so as to continue from the top flat surface to the bow side. The bow deck extends in the ship width direction between the pair of ship sides. Effect of the Invention

[0007] According to the ship of the present disclosure, it is possible to enlarge the tank while securing the necessary mooring area. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a marine vessel according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a plan view of a marine vessel according to an embodiment of the present disclosure. [Diagram 3] 1 is a cross-sectional view of a tank and a tank cover of a marine vessel according to an embodiment of the present disclosure, viewed from the bow-stern direction. [Figure 4] FIG. 2 is a plan view showing the top flat surface of the forecastle and tank cover in an embodiment of the present disclosure. [Diagram 5] FIG. 11 is a plan view showing a bow deck and a top flat surface of a tank cover in a modified example of a marine vessel according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. FIG. (Vessel configuration) 1 to 3, a ship 1A exemplified in this embodiment is a liquefied gas carrier that transports liquefied gas such as LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), liquefied carbon dioxide, and liquefied ammonia. The ship 1A at least includes a hull 2, a tank 10, a tank cover 20, a bow deck 30, and mooring equipment 40A. Note that the type of ship 1A is merely an example, and is not limited to a liquefied gas carrier.

[0010] (Hull configuration) The hull 2 ​​has a pair of side panels 3A, 3B that form its outer hull, a ship bottom 4 (see Figures 1 and 3), and an upper deck 5. The side panels 3A, 3B have a pair of side panel shells that form the port and starboard sides, respectively. The ship bottom 4 has a ship bottom panel shell that connects the side panels 3A, 3B. The pair of side panels 3A, 3B and the ship bottom 4 form the outer hull of the hull 2 ​​into a U-shape in a cross section perpendicular to the bow-stern direction FA. The hull 2 ​​has an upper deck 5 on its upper part. The upper deck 5 is a deck that is located on the uppermost layer on the stern 2b side of the bow deck 30. In this embodiment, the upper deck 5 is an exposed deck with at least a part of it exposed to the outside. The hull 2 ​​is provided with an inner bottom 9 (see FIG. 3) that is disposed above the bottom 4 (bottom shell plate) and spaced apart to form a double bottom.

[0011] A superstructure 7 is formed on the hull 2. The superstructure 7 is formed, for example, on the upper deck 5 on the stern 2b side of the hull 2, and forms an accommodation area therein.

[0012] The hull 2 ​​is provided with a cargo carrying section 8 (in other words, a cargo hold) on the bow 2a side of the superstructure 7. The cargo carrying section 8 illustrated in this embodiment is recessed toward the bottom 4 of the ship below in the vertical direction Dv with respect to the upper deck 5, and has an opening that opens upward.

[0013] (Tank configuration) The tanks 10 are arranged in the cargo carrying area 8. For example, four tanks 10 are arranged at intervals in the bow-stern direction FA in the cargo carrying area 8 on the bow 2a side of the superstructure 7. It is to be noted that only one tank 10 may be arranged.

[0014] Each tank 10 can store liquefied gas therein. As shown in Fig. 3, the tank 10 of this embodiment is a rectangular tank having a bottom wall portion 12, a pair of lower inclined wall portions 13, a pair of side wall portions 14, a pair of upper inclined wall portions 15, a top wall portion 16, and a pair of end wall portions 17.

[0015] The bottom wall portion 12 is supported from below on the inner bottom portion 9 by a plurality of tank support members 19. The bottom wall portion 12 is along a plane intersecting the vertical direction Dv. The bottom wall portion 12 is a rectangular plate when viewed from the vertical direction Dv. The pair of lower inclined wall portions 13 extend upward from both ends of the lower inclined wall portion 13 in the ship's width direction Dw, inclining outward in the ship's width direction Dw. The pair of side wall portions 14 extend upward from each upper end of the pair of lower inclined wall portions 13. The pair of side wall portions 14 are arranged at intervals in the ship's width direction Dw and are provided along the ship's sides 3A and 3B at intervals. The pair of upper inclined wall portions 15 extend upward from each upper end of the pair of side wall portions 14, inclining inward in the ship's width direction Dw. The top wall portion 16 is provided so as to connect the upper end edges of the pair of upper inclined wall portions 15 to each other. The top wall portion 16 extends in a ship width direction Dw that intersects with the up-down direction Dv. The top wall portion 16 has a rectangular plate shape in a top view.

[0016] The tank 10 of this embodiment has a cylindrical portion 18 with a polygonal cross-section extending in the bow-stern direction FA, which is formed by the above-mentioned bottom wall portion 12, a pair of lower inclined wall portions 13, a pair of side wall portions 14, a pair of upper inclined wall portions 15, and a top wall portion 16. As shown in Figures 1 and 2, the pair of end wall portions 17 are provided so as to close the openings on both sides of the cylindrical portion 18 in the fore-aft direction FA. Each end wall portion 17 is along a plane intersecting with the fore-aft direction FA. The shape of the tanks 10 arranged in the cargo carrying compartment 8 of the hull 2, the number of tanks 10, the shape of the tanks 10, and the layout of the tanks 10 can be changed as appropriate. The tanks 10 may be, for example, cylindrical, spherical, rectangular, or the like with a circular cross section extending in the fore-aft direction FA.

[0017] As shown in Figures 1 and 3, the upper portion 10a of the tank 10 in the vertical direction Dv is located above the upper deck 5 of the hull 2. That is, each tank 10 is provided so as to protrude above the upper deck 5. More specifically, as shown in Figure 3, an opening 5h is formed in the center of the upper deck 5 in the ship's width direction Dw, and the upper portion 10a of each tank 10 protrudes above the upper deck 5 by penetrating the opening 5h formed in the center of the upper deck 5 in the ship's width direction Dw.

[0018] The tank cover 20 is disposed on the upper deck 5. The tank cover 20 covers the tank 10 from above in the vertical direction Dv. The tank cover 20 continuously covers a plurality of tanks 10 lined up in the bow-stern direction FA. As shown in Fig. 3, the tank cover 20 of this embodiment covers only the upper portion 10a that protrudes above the upper deck 5 from above.

[0019] 3, the tank cover 20 is disposed at a distance in the up-down direction Dv from the upper part 10a of the tank 10 that protrudes upward from the upper deck 5. In other words, the inner surface 20g of the tank cover 20 facing the tank 10 is disposed at a distance in the up-down direction Dv from the outer surface 10f of the upper part 10a of the tank 10. The tank cover 20 is further disposed at a distance inward in the ship width direction Dw from the pair of ship sides 3A, 3B.

[0020] The tank cover 20 has a pair of cover side walls 21A, 21B and a top flat surface 24. Each of the cover side walls 21A, 21B illustrated in this embodiment has an upper portion 21a and a lower portion 21b. The lower portion 21b of the cover side wall portion 21A extends upward from a position a predetermined distance away on the inside in the ship width direction Dw from the ship side 3A. The upper portion 21a of the cover side wall portion 21A extends upward, inclined toward the inside in the ship width direction Dw. The cover side wall portion 21B is formed symmetrically with the cover side wall portion 21A. The lower portion 21b of the cover side wall portion 21B extends upward from a position a predetermined distance away on the inside in the ship width direction Dw from the ship side 3B on the upper deck 5. In this embodiment, the upper portion 21a of the cover side wall portion 21B extends upward, inclined toward the inside in the ship width direction Dw.

[0021] The top flat surface 24 connects the upper ends of the pair of cover side wall portions 21A, 21B. As shown in Fig. 2, the top flat surface 24 has a rectangular shape in a plan view with the long side in the bow-stern direction FA and the short side in the width direction Dw in a top view. The top flat surface 24 extends in the width direction Dw intersecting with the up-down direction Dv. The top flat surface 24 may be flat, but may be gradually inclined or curved downward from the center of the width direction Dw toward both outer sides in the width direction Dw, as long as it does not interfere with the installation of the mooring equipment 40A described later or with the walking movement of workers on the top flat surface 24.

[0022] As shown in Figs. 2 and 3, the upper deck 5 has a pair of passages 51A, 51B. The passage 51A is exposed upward between the cover side wall 21A and the ship's side 3A, and extends in the bow-stern direction FA. The passage 51B is exposed upward between the cover side wall 21B and the ship's side 3B, and extends in the bow-stern direction FA. Each of the passages 51A, 51B has a width at least large enough for workers (people) to pass through. This allows workers to pass through the passages 51A, 51B.

[0023] 1 and 2, the passages 51A and 51B of this embodiment are provided with equipment 100 such as a manifold 101. The manifold 101 has a connection port to which an external pipe (not shown) for supplying liquefied gas from the outside of the ship 1A to the tank 10, an external pipe (not shown) for discharging the liquefied gas stored in the tank 10 to the outside, and the like can be detachably attached. Note that the equipment 100 provided in the passages 51A and 51B is not limited to the manifold 101. Equipment 100 other than the manifold 101 may be provided in the passages 51A and 51B.

[0024] FIG. 4 is a plan view showing the bow deck and the top flat surface of the tank cover in this embodiment. As shown in Figs. 1, 2 and 4, the bow deck 30 is disposed on the bow 2a side with respect to the tank cover 20. The bow deck 30 is formed so as to be continuous with the top flat surface 24 of the tank cover 20 in the bow-stern direction FA. In the vertical direction Dv, the bow deck 30 is provided at a predetermined distance above the upper deck 5. In this embodiment, the bow deck 30 and the top flat surface 24 are formed at the same height and are formed continuously in the bow-stern direction FA. Note that the bow deck 30 and the top flat surface 24 are not limited to being at the same height. For example, there may be a slight step in the vertical direction Dv between the bow deck 30 and the top flat surface 24 to the extent that a person can directly pass between the bow deck 30 and the top flat surface 24. Furthermore, the bow deck 30 and the top flat surface 24 may be spaced apart in the bow-stern direction FA to an extent that allows people to pass directly between the bow deck 30 and the top flat surface 24. In that case, a plate-like member (not shown) or the like may be provided between the bow deck 30 and the top flat surface 24 to make it easier for workers to pass between them.

[0025] 4, the bow deck 30 extends in the ship's width direction Dw so as to span between the pair of ship's sides 3A, 3B. The width dimension W1 in the ship's width direction Dw of the trailing edge 30t of the bow deck 30 located closest to the stern 2b is larger than the width dimension W2 in the ship's width direction Dw of the leading edge 24s of the top flat surface 24 of the tank cover 20 located closest to the bow 2a.

[0026] As shown in Figures 1 and 4, the upper deck 5 illustrated in this embodiment is provided closer to the stern 2b in the bow-stern direction FA than the bow deck 30. An edge 5s (see Figure 1) on the bow 2a side of the upper deck 5 and a rear edge 30t on the stern 2b side of the bow deck 30 are connected by a vertical wall 35 extending in the up-down direction Dv. As a result, a step is formed between the upper deck 5 and the bow deck 30. For example, steps or a ladder (not shown) may be provided in this step to enable workers to ascend and descend between the upper deck 5 and the bow deck 30.

[0027] As shown in Fig. 4, the mooring equipment 40A includes a mooring device 41A and a mooring guide device 45A. The mooring device 41A is equipped with a hawser drum (not shown) capable of paying out and retracting the mooring rope 42. The mooring guide device 45A guides the mooring rope 42 paid out from the hawser drum (not shown) of the mooring device 41A. Examples of the mooring guide device 45A include a deck stand roller 46A that changes the direction in which the mooring rope 42 is laid out, and a closed fairlead 47A having an insertion hole 47h through which the mooring rope 42 is inserted.

[0028] At least a part of such mooring equipment 40A is arranged on the bow deck 30. In this embodiment, for example, the mooring device 41A and the deck stand roller 46A are arranged on the bow deck 30. For example, the mooring device 41A is arranged in the center of the bow deck 30 in the ship's width direction Dw. The mooring rope 42 that is reeled out from the hawser drum (not shown) of the mooring device 41A is changed in its arrangement direction by the deck stand roller 46A so as to extend to the ship's sides 3A and 3B on both sides in the ship's width direction Dw. The ship's sides 3A and 3B located on both sides of the bow deck 30 in the ship's width direction Dw protrude upward from the upper surface 30f of the bow deck 30. The closed fairlead 47A of this embodiment is formed in the part of the ship's sides 3A and 3B that protrudes upward from the upper surface 30f of the bow deck 30. The mooring rope 42 is led out of the ship (to land, etc.) through a closed fairlead 47A.

[0029] (Action and effect) In the ship 1A of the above embodiment, the bow deck 30 is formed so as to be continuous with the top flat surface 24 of the tank cover 20. This makes it possible to use the area extending to the top flat surface 24 in addition to the bow deck 30 for various purposes. When the mooring device 40A is provided on the bow deck 30, the worker who handles the mooring device 40A can work not only on the bow deck 30 but also in an area extending to the top flat surface 24, improving workability. In other words, it is no longer necessary to secure a work space for handling the mooring device 40A only on the bow deck 30, and the freedom of arrangement of the mooring device 40A on the bow deck 30 is increased. In addition, the bow deck 30 is prevented from expanding toward the stern 2b side due to the arrangement space of the mooring device 40A. Therefore, the tank 10 can be enlarged while securing the necessary mooring area. In addition, it is not necessary to reduce the size of the tank 10 or the tank cover 20 in order to increase the arrangement space of the mooring device 40A. As a result, the space for arranging the mooring equipment 40A, etc. can be increased while suppressing a reduction in the amount of liquefied gas carried on board, thereby increasing the degree of freedom in arranging the mooring equipment 40A, etc. In addition, by forming the bow deck 30 so as to be continuous with the top flat surface 24 of the tank cover 20, the air resistance experienced by the tank cover 20 can be reduced, and the amount of fuel consumed when the ship 1A is sailing can be reduced. Furthermore, it is possible to facilitate the movement of people between the top flat surface 24 and the bow deck 30, thereby reducing the burden on workers performing mooring work.

[0030] Furthermore, in the above embodiment, the upper surface 30f of the bow deck 30 and the top flat surface 24 are formed at the same height. This allows workers to easily move between the bow deck 30 and the top flat surface 24. Furthermore, in cases where it becomes necessary to route the mooring ropes 42 and the like across between the bow deck 30 and the top flat surface 24, the mooring ropes 42 and the like are prevented from coming into contact with the top flat surface 24 and interfering with normal mooring operations, and the mooring ropes 42 and the like can be smoothly inserted and removed.

[0031] In the above embodiment, at least a part of the mooring equipment 40A is disposed on the bow deck 30. This allows an operator to use not only the bow deck 30 but also the top flat surface 24 as a work space when handling the mooring equipment 40A, improving workability.

[0032] Furthermore, in the above embodiment, passages 51A, 51B are provided between the tank cover 20 and the pair of ship sides 3A, 3B. This ensures a space for workers to move in the bow-stern direction FA. Also, since equipment 100 such as a manifold 101 can be arranged in the passages 51A, 51B, it is possible to prevent the position of the equipment 100 in the vertical direction Dv from becoming excessively high, as in the case where the equipment 100 is arranged on the top of the tank cover 20, and thus prevent the ship-shore compatibility from being impaired.

[0033] (Modification of the embodiment) FIG. 5 is a plan view showing a bow deck and a top flat surface of a tank cover in a modified example of the ship of the present embodiment. In the above embodiment, of the mooring equipment 40A, the mooring device 41A and the deck stand roller 46A are arranged on the bow deck 30, and the closed fairlead 47A is formed on the upper end parts 3t of the ship's sides 3A, 3B on both sides in the ship's width direction Dw of the bow deck 30, but this is not limited to this.

[0034] As shown in FIG. 5, in the modified embodiment of the present embodiment, in the ship 1B, among the mooring equipment 40B, the mooring device 41B may be arranged on the bow deck 30, and the deck stand roller 46B and the closed fairlead 47B as the mooring guide device 45B may be arranged on the top flat surface 24 of the tank cover 20. In this case, the mooring rope 42 that is reeled out from the hawser drum (not shown) of the mooring device 41B extends to the stern 2b side, and the deck stand roller 46B changes the direction of the mooring rope 42 so that it extends to the ship sides 3A and 3B sides. The closed fairlead 47B is provided on both ends of the top flat surface 24 in the ship width direction Dw. The closed fairlead 47B is provided so as to protrude upward from both ends of the top flat surface 24. The mooring rope 42 is led out of the ship (on land, etc.) through an insertion hole 47g formed in the closed fairlead 47B.

[0035] In the ship 1B according to a modification of the above embodiment, the bow deck 30 is formed so as to be continuous with the top flat surface 24 of the tank cover 20. This allows the mooring guide devices 45B, which are part of the mooring equipment 40B, to be disposed also on the top flat surface 24 of the tank cover 20. This increases the degree of freedom in arranging the mooring equipment 40B.

[0036] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. For example, in the above embodiment, the upper deck 5 is provided closer to the stern 2b than the bow deck 30 in the bow-stern direction FA, but this is not limited to the above. The upper deck 5 may be a full deck that extends from the bow 2a to the stern 2b in the bow-stern direction FA of the hull 2. In this case, the bow deck 30 is provided above and spaced from the end of the upper deck 5 on the bow 2a side.

[0037] In addition, the cross-sectional shape of the tank cover 20 when viewed from the bow-stern direction FA is not limited to the configuration exemplified in the above embodiment. The cross-sectional shape of the tank cover 20 can be changed to another shape as appropriate as long as it has a top flat surface 24. In addition, the top flat surface 24 to which the bow deck 30 is connected is not necessarily formed over the entirety of the tank cover 20 in the bow-stern direction FA, and may be formed, for example, only in a part on the bow 2a side.

[0038] In the above embodiment, the tank cover 20 is configured to cover the multiple tanks 10 in a continuous manner, but this is not limited to the above. The tank cover 20 may be provided to cover each of the multiple tanks 10. In this case, the bow deck 30 is formed to be continuous with the top flat surface 24 of the tank cover 20 located closest to the bow 2a in the bow-stern direction FA. Furthermore, in the above embodiment, the closed fairlead 47B has been described as an example, but the fairlead is not limited to a closed type fairlead. In addition, the bow deck 30 is not limited to being formed at a constant height in the bow-stern direction FA and the ship width direction Dw. For example, it may be gradually inclined or curved downward from the center in the ship width direction Dw toward both outer sides in the ship width direction Dw, similar to the top flat surface 24. Furthermore, the bow deck 30 may be inclined from the trailing edge 30t on the stern 2b side toward the bow 2a side, or may have a slight step.

[0039] Furthermore, in the above embodiment, a description has been given of a case where the mooring device 40A is provided on the bow deck 30. However, the mooring device 40A is not limited to being disposed on the bow deck 30. In this case, the mooring device 40A may be disposed on a deck (not shown) lower than the bow deck 30, for example.

[0040] In addition, although the ships 1A and 1B are liquefied gas carriers in the above example, the ships 1A and 1B are not limited to this, and may be other types of ships, such as chemical tankers and crude oil tankers.

[0041] <Additional Notes> The ships 1A and 1B described in the embodiment can be understood, for example, as follows.

[0042] (1) A ship 1A, 1B in a first embodiment comprises a hull 2 ​​having a pair of ship sides 3A, 3B, an upper deck 5 provided on the hull 2, a tank 10 provided within the hull 2, an upper part 10a of which penetrates the center of the upper deck 5 in the ship width direction Dw and protrudes upward above the upper deck 5, a tank cover 20 provided at a distance inward in the ship width direction Dw from the pair of ship sides 3A, 3B, covering the multiple tanks 10 from above and having a top flat surface 24 extending in the bow-stern direction FA, and a bow deck 30 formed to connect from the top flat surface 24 to the bow 2a side and extending in the ship width direction Dw between the pair of ship sides 3A, 3B.

[0043] This allows the area extending from the bow deck 30 to the top flat surface 24 to be used for various purposes. This increases the degree of freedom in arranging the mooring devices 40A, 40B, etc. Also, the bow deck 30 is prevented from expanding toward the stern 2b due to the space required for arranging the mooring devices 40A, 40B, etc. In other words, there is no need to downsize the tank 10 or the tank cover 20 in order to increase the space required for arranging the mooring devices 40A, 40B. As a result, the space required for arranging the mooring devices 40A, 40B, etc. can be increased while preventing a decrease in the amount of liquefied gas carried, thereby increasing the degree of freedom in arranging the mooring devices 40A, 40B, etc. In addition, by forming the bow deck 30 so as to be continuous with the top flat surface 24 of the tank cover 20, the air resistance experienced by the tank cover 20 can be reduced, and fuel consumption when the ships 1A, 1B are operating can be reduced.

[0044] (2) The ships 1A and 1B according to a second embodiment are the ships 1A and 1B of (1), in which the upper surface 30f of the bow deck 30 and the top flat surface 24 are formed at the same height.

[0045] This makes it possible to prevent the mooring ropes 42 and the like from getting caught in the step between the bow deck 30 and the top flat surface 24. It also makes it easier for workers to move between the bow deck 30 and the top flat surface 24.

[0046] (3) The ships 1A, 1B of the third aspect are the ships 1A, 1B of (1) or (2), and at least a portion of the mooring equipment 40A, 40B including mooring devices 41A, 41B capable of paying out and reeling in a mooring rope 42 and mooring guide devices 45A, 45B capable of guiding the mooring rope 42 paid out from the mooring devices 41A, 41B are arranged on the bow deck 30. The mooring guide devices 45A, 45B include deck stand rollers 46A, 46B and closed fairleads 47A, 47B.

[0047] As a result, by arranging at least a portion of the mooring devices 40A, 40B on the bow deck 30, the mooring devices 40A, 40B can be arranged not only on the bow deck 30 but also on the top flat surface 24 of the tank cover 20. Furthermore, when handling the mooring devices 40A, 40B, not only the bow deck 30 but also the top flat surface 24 can be used as a work space, improving workability.

[0048] (4) The ships 1A, 1B in the fourth aspect are any one of the ships 1A, 1B of (1) to (3), wherein the upper deck 5 is provided with passage portions 51A, 51B exposed upward between the tank cover 20 and a pair of the ship sides 3A, 3B and extending in the bow-stern direction FA.

[0049] As a result, the passages 51A, 51B are provided between the tank cover 20 and the pair of ship sides 3A, 3B, and it is possible to secure a space for workers to move in the bow-stern direction FA. In addition, it is also possible to arrange equipment 100 such as a manifold 101 in the passages 51A, 51B. [Explanation of symbols]

[0050] 1A, 1B... Ship 2... Hull 2a... Bow 2b... Stern 3A, 3B... Ship's side 3t... Upper end 4... Bottom 5... Upper deck 5h... Opening 5s... Edge 6... Bottom deck 7... Superstructure 8... Cargo space 9... Inner bottom 10... Tank 10a... Upper part 10f... Outer surface 12... Bottom wall 13... Lower inclined wall 14... Side wall 15... Upper inclined wall 16... Top wall 17... End wall 18... Cylindrical part 19... Tank support member 20... Tank cover 20g... Inner surface 21A, 21B... Cover side wall 24... Top flat surface 24s... Leading edge 30... Bow deck 30f... Upper surface 30t... Trailing edge 35... Vertical wall 40A, 40B... Mooring equipment 41A, 41B...Mooring device 42...Mooring line 45A, 45B...Mooring guide device 46A, 46B...Deck stand roller 47A, 47B...Closed fairlead 47g, 47h...Through hole 51A, 51B...Passage 100...Equipment 101...Manifold Dv...Up-down direction FA...Fore-aft direction Dw...Width direction W1...Width dimension W2...Width dimension

Claims

1. A hull having a pair of sides; An upper deck provided on the hull; A tank provided within the hull, the upper portion of which penetrates the center portion of the upper deck in the ship width direction and protrudes above the upper deck; a tank cover provided on the inner side of the pair of ship sides in the ship width direction at an interval therebetween, covering the plurality of tanks from above, and having a flat top surface extending in the bow-stern direction; A bow deck is formed so as to connect the top flat surface to the bow side and extends in the ship width direction between the pair of ship sides. ship.

2. The upper surface of the bow deck and the top flat surface are formed at the same height.

2. The watercraft of claim 1.

3. On said forecastle, A mooring device capable of paying out and winding a mooring line; and a mooring guide device capable of guiding the mooring line reeled out from the mooring device.

3. A vessel as claimed in claim 1 or 2.

4. The upper deck is provided with a passageway portion that is exposed upward between the tank cover and the pair of ship sides and extends in the bow-stern direction.

3. A vessel as claimed in claim 1 or 2.

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