Ships

Abstract

To provide a ship capable of properly grounding a rampway while avoiding a structural complexity.SOLUTION: A ship comprises: a hull 10 with a pair of broadsides 11; a superstructure 30 mounted on the hull 10, located closer to the center side in a ship width direction than the broadside 11, and having a vehicle entrance 46 open to the outside in the ship width direction and to diagonally in a bow and stern direction; a vehicle deck 70 provided in the superstructure 30 and leading to the vehicle entrance 46; and a rampway 80 displaceably provided between a bridging position extending from the vehicle entrance 46 toward the diagonal direction corresponding to an opening direction of the vehicle entrance 46 and grounding to a quay Q near the center of the bow and stern direction, and a storage position blocking the vehicle entrance 46 from the outside by being arranged along the vehicle entrance 46.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] To improve the efficiency of cargo handling operations on ships and reduce the number of personnel required, a roll-on / roll-off method is known in which vehicles loaded with cargo can be loaded and unloaded directly onto a rampway that connects the ship to the quay.

[0003] For example, Patent Document 1 discloses a configuration of a ship in which a ramp constituting a rampway is provided on the ship's side, and the ramp is stored so as to be closely attached to the ship's side when sailing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-190999 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the ship described in Patent Document 1 has a rampway on the ship's side, which requires a turning section with a watertight or weathertight structure to prevent seawater from entering when the rampway is stored, which poses a problem of making the ship's structure more complex. Furthermore, if the rampway at the stern of the ship is to be bridged over a quay whose length is shorter than the ship's, the length of the rampway bridge will be unnecessarily long, and there is also the problem that it will be difficult to properly land the ship.

[0006] The present disclosure has been made to solve the above-mentioned problem, and aims to provide a ship that can properly ground a rampway while avoiding structural complexity. [Means for solving the problem]

[0007] In order to solve the above problems, a vessel according to the present disclosure comprises a hull having a pair of side walls, a superstructure provided on the hull, positioned closer to the center in the ship's width direction than the side walls, and having a vehicle boarding entrance that opens outward in the ship's width direction and diagonally in the bow-stern direction, a vehicle deck provided within the superstructure and connected to the vehicle boarding entrance, and a rampway provided displaceably between a storage position that is disposed along the vehicle boarding entrance to close the vehicle boarding entrance from the outside, and a bridge position that extends from the vehicle boarding entrance in the diagonal direction that is the opening direction of the vehicle boarding entrance and is grounded on a quay wall near the center in the bow-stern direction. The vehicle boarding opening is located toward the bow or stern of the hull's center in the bow-stern direction, and opens outward in the width direction of the ship and diagonally toward the center in the bow-stern direction, the superstructure has a narrowed portion formed so that a portion of the bow-stern direction is recessed toward the center in the width direction of the ship, and the vehicle boarding opening opens into the outer wall surface that forms the narrowed portion. [Effects of the Invention]

[0008] According to the present disclosure, the rampway can be properly grounded even when the length of the quay is shorter than the overall length of the ship, while avoiding structural complexity. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a vessel according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a plan view of a vessel according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a horizontal cross-sectional view of the vicinity of the superstructure and rampway of the vessel according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a partially enlarged side view of a vessel according to an embodiment of the present disclosure, showing a rampway positioned as a bridge. [Figure 5] FIG. 1 is a partially enlarged side view of a vessel according to an embodiment of the present disclosure, showing a rampway in a retracted position. DETAILED DESCRIPTION OF THE INVENTION

[0010] A ship 1 according to an embodiment of the present disclosure will be described below with reference to Figures 1 to 5. The ship 1 according to this embodiment is a ship 1 on which vehicles loaded with cargo can be loaded and unloaded as they are, and which is capable of refueling other ships at sea.

[0011] As shown in Figure 1, the ship 1 has a hull 10, an upper deck 20, a superstructure 30, a fuel mast 50 as offshore work equipment, a fuel tank 51, a vehicle deck 70, a vehicle boarding deck 60, a connecting slope 75, and a rampway 80.

[0012] <Hull> As shown in Figures 1 and 2, the hull 10 has a pair of left and right side panels 11 and a bottom panel 12, which form the outer hull of the ship 1. Each side panel 11 is made up of a side panel. The bottom panel 12 is made up of a bottom panel 12 that connects the left and right side panels at their lower ends in the ship height direction (hereinafter simply referred to as "lower"). A propeller 15 and a rudder 16 are provided at the stern of the hull 10.

[0013] <Upper Deck> The upper deck 20 connects the pair of left and right side panels 11 above the ship bottom 12 in the ship height direction (hereinafter simply referred to as "above"). The upper deck 20 extends horizontally across the upper ends of the pair of side panels 11. The upper deck 20 is an exposed deck that serves as a full-length deck extending from the bow to the stern. The upper deck 20 is provided at a ship height position that is equal to or higher than the freeboard deck. In other words, the upper deck 20 itself may be a freeboard deck, or the upper deck 20 may be configured to be located above the freeboard deck provided within the hull 10.

[0014] <Superstructure> The superstructure 30 is provided so as to protrude upward from the upper deck 20 of the hull 10. In other words, the superstructure 30 is located higher than the sides 11 of the hull 10. The superstructure 30 is provided closer to the center in the bow-stern direction than the bow and stern and spaced apart from these. The superstructure 30 of this embodiment is composed of a bow structure 31, a central structure 32, and a stern structure 40, which are arranged in this order from the bow side to the stern side.

[0015] <Fore side structure> The bow structure 31 constitutes the bow-most part of the superstructure 30. A control room and the like for operating the vessel 1 are provided within the bow structure 31. The control room is configured to provide a view of the front of the vessel 1 from a high vantage point. For this reason, the bow structure 31 is the highest structure of the superstructure 30.

[0016] <Central structure> The central structure 32 is connected to the aft end of the bow structure 31. The central structure 32 extends across the center of the hull 10 in the bow-stern direction. The height of the central structure 32 is lower than that of the bow structure 31. The central structure 32 has a pair of central side walls 33, a central ceiling wall 34, and a pair of corner walls 35, and a space partitioned by these walls is formed inside.

[0017] A pair of central side walls 33 are provided on the left and right, extending in the ship height direction and the bow-stern direction, respectively. The ceiling wall extends horizontally to form the ceiling of the central structure 32. The central ceiling wall 34 connects the pair of central side walls 33 to each other. The bow-side end of the central ceiling wall 34 is connected to the bow-side structure 31.

[0018] The pair of corner walls 35 are formed by diagonally cutting out the left and right corners of the aft end of the central structure 32. The corner walls 35 extend in the vertical direction and also extend diagonally toward the center of the ship's width as they move toward the aft side.

[0019] <Stern side structure> The stern structure 40 constitutes the sternmost part of the superstructure 30. The stern structure 40 is connected to the stern end of the central structure 32. The height of the stern structure 40 is lower than the height of the bow structure 31 and higher than the height of the central structure 32.

[0020] The stern structure 40 has a pair of stern side walls 41, a rear wall 42, a front wall 43, an stern ceiling wall 44, and a sloped wall 45. A space partitioned by these walls is formed inside the stern structure 40. The space within the stern structure 40 and the section within the central structure 32 communicate with each other in the bow-stern direction at the connection point between the stern structure 40 and the central structure 32.

[0021] The pair of stern-side side walls 41 are provided on the left and right sides and extend in the ship height direction and the bow-stern direction, respectively. The pair of stern-side side walls 41 are arranged so as to incline upward from the upper deck 20 toward the center in the ship width direction. The rear wall 42 extends in the ship height direction and the ship width direction, and connects the pair of stern side walls 41 together in the ship height direction. The rear wall 42 extends at an angle upward toward the bow side.

[0022] The forward wall 43 extends in the ship height and width directions, and constitutes the bow side portion of the stern structure 40. The aft end of the central structure 32, i.e., the aft end of the central side wall 33 and the central ceiling wall 34, are connected to the forward wall 43. Below the forward wall 43, a communication point is formed between the space inside the stern structure 40 and the space inside the central structure 32. The stern ceiling wall 44 extends horizontally to form the ceiling of the stern structure 40. The stern ceiling wall 44 connects the upper ends of the walls of the stern structure 40 to each other.

[0023] <Slanted wall> A pair of inclined walls 45 are provided on the left and right, spaced apart in the beam direction of the ship. Each inclined wall 45 is provided between the corresponding aft sidewall 41 and forward wall 43. The aft end of each inclined wall 45 is connected vertically to the bow end of the corresponding aft sidewall 41. The bow end of each inclined wall 45 is connected to the transverse end of the forward wall 43 and the aft end of the corner wall 35 of the central structure 32, respectively. Each inclined wall 45 extends obliquely inward in the beam direction from the aft side to the bow side, i.e., from the aft sidewall 41 to the forward wall 43.

[0024] Each inclined wall 45 extends at an angle toward the center and stern in the ship's width direction as it extends upward. The outer wall surfaces of the inclined walls 45 face obliquely toward the center in the bow-stern direction as they extend outward in the ship's width direction, and also face slightly upward. The inclined wall 45 has a shape formed by chamfering the portions between the aft side walls 41 and the forward wall 43 of the aft structure 40. Correspondingly, the aft ceiling wall 44 also has a shape in which the corners on both sides of the bow side in the width direction of the ship are cut out.

[0025] <Constricted part> The central structure 32 is provided with a corner wall 35, and the aft structure 40 is provided with a sloped wall 45, so that a constricted portion C is formed in the superstructure 30 between the central structure 32 and the aft structure 40. That is, the constricted portion C is a recess formed in a fore-aft portion of the superstructure 30 that is recessed from the outer side in the width direction of the ship toward the center in the width direction of the ship. The constricted portion C extends in the ship height direction to form a valley line that extends up and down at the connection point between the sloped wall 45 and the corner wall 35, and in a plan view, it has a triangular shape with the valley line as its apex. Due to the shape of the constricted portion C, the portion of the upper deck 20 between the central structure 32 and the aft structure 40 is more exposed to the outside than other portions.

[0026] <Vehicle entrance> A vehicle access opening 46 is formed in one of the pair of inclined walls 45 (the starboard inclined wall 45 in this embodiment) so as to communicate the inside and outside of the stern-side structure 40. As a result, the vehicle access opening 46 is provided in an area (center-near area) closer to the center in the bow direction than the stern. The vehicle access opening 46 is formed in the lower part of the inclined wall 45. When viewed from inside the stern-side structure 40, the vehicle access opening 46 opens in a diagonal direction that approaches the bow-stern direction as it moves outward in the width direction of the ship. In particular, in this embodiment, the vehicle access opening 46 opens in a diagonal direction that approaches the center in the bow-stern direction as it moves outward in the width direction of the ship. The opening direction of the vehicle access opening 46 is, for example, in a direction inclined at 30 to 60 degrees with respect to the bow-stern direction in a plan view, preferably in a direction inclined at 40 to 50 degrees, and more preferably in a direction inclined at 45 degrees.

[0027] The vehicle entrance 46 has a rectangular shape that follows the lower edge, upper edge, and pair of side edges of the inclined wall 45. The lower end of the vehicle entrance 46 is located above the upper deck 20. The width and height of the vehicle entrance 46 are sized to allow various vehicles, such as ordinary vehicles and large vehicles, to pass through. The vehicle entrance 46 is provided in the inclined wall 45, and is therefore located above the upper deck 20 and closer to the center of the ship's width than the side 11.

[0028] <Fueling Mast 50 (offshore work equipment)> The fueling masts 50 are provided on the hull 10, closer to the center in the bow-stern direction (on the bow side in this embodiment) than the vehicle boarding entrance 46. The fueling masts 50 are columnar and extend further upward from the central ceiling wall 34 of the central structure 32, and a pair of them are provided spaced apart in the bow-stern direction.

[0029] <Fuel tank> The fuel tank 51 is provided in an area below the central structure 32 within the hull 10. The fuel tank 51 stores fuel for refueling other ships. The ship 1 is provided with fuel lines (not shown) that extend from the fuel tank 51 to the top of the fuel mast 50. By connecting fuel hoses to the ends of these fuel lines on the fuel mast 50 side, it is possible to supply fuel to other ships via the fuel hoses.

[0030] <Vehicle Deck> As shown in Figures 1 and 3, the vehicle deck 70 is a deck on which various vehicles are loaded, and is provided to extend horizontally within the superstructure 30. The vehicle deck 70 is provided above the upper deck 20 and above the lower end of the vehicle entry opening 46. The vehicle deck 70 is located above the lower end of the vehicle entry opening 46. In this embodiment, the vehicle decks 70 include a bow-side vehicle deck 71 and an aft-side vehicle deck 72. The bow-side vehicle deck 71 is provided throughout the entire space within the central structure 32 in the bow-stern direction. The aft-side vehicle deck 72 is provided in the aft-side area within the space within the aft-side structure 40, excluding a portion of the bow-side area.

[0031] <Vehicle boarding deck> The vehicle boarding deck 60 is a deck onto which vehicles can directly board from the vehicle boarding opening 46. The vehicle boarding deck 60 is provided in an area on the stern side adjacent to the vehicle boarding opening 46 in the space within the stern structure 40. The vehicle boarding deck 60 is provided to extend horizontally within the superstructure 30. The height position of the vehicle boarding deck 60 above the ship is set to the same height as the lower end of the vehicle boarding opening 46. The vehicle boarding deck 60 is located above the upper deck 20 and below the vehicle deck 70.

[0032] <Connecting slope> The connecting slope 75 is an inclined passageway for connecting the vehicle boarding deck 60 and the vehicle deck 70, which are located at different positions in the ship height direction inside the superstructure 30. That is, the connecting slope 75 has one end connected to the vehicle boarding deck 60, extends upward from one end to the other end, and is connected to the vehicle deck 70 at the other end. In this embodiment, two connecting slopes 75 are provided, one for connecting the stern-side vehicle deck 72 and the vehicle boarding deck 60, and the other for connecting the bow-side vehicle deck 71 and the vehicle boarding deck 60.

[0033] <Rampway> The rampway 80 is a movable passageway that allows vehicles to board the ship 1 from the quay Q. The rampway 80 has a first slope 81 and a second slope 82.

[0034] As shown in Figures 4 and 5, the first slope 81 is a rectangular plate-shaped member, and one longitudinal end that forms the short side of the rectangle is connected to be rotatable around a first axis O1 that runs along the lower end of the vehicle entrance 46. The second slope 82 is a rectangular plate-shaped member similar to the first slope 81, and one longitudinal end constituting the short side of the rectangle is connected to the other longitudinal end of the first slope 81 so as to be rotatable around a second axis O2 parallel to the first axis O1.

[0035] The rampway 80 is configured to be displaceable between a bridging position and a storage position. 4, the bridge position is such that the first slope 81 and the second slope 82 extend diagonally (outside the width of the ship and toward the bow and stern) in the direction of the opening of the vehicle boarding entrance 46, and the other end of the second slope 82 is in contact with the quay Q. As a result, the rampway 80 bridges between the vehicle boarding entrance 46 and the quay Q, making it possible for vehicles to get on and off the ship 1 via the rampway 80.

[0036] As shown in FIG. 5 , the stowed position is a position where the first slope 81 and the second slope 82 are folded so as to overlap and are arranged along the inclined wall 45. That is, from the bridged position, the second slope 82 is rotated in a mountain fold relative to the first slope 81 about the second axis O2, so that the first slope 81 and the second slope 82 are overlapped. By rotating the first slope 81 about the first axis O1 in a valley fold relative to the inclined wall 45 simultaneously with the rotation about the second axis O2, the rampway 80 consisting of the first slope 81 and the second slope 82 is placed in the stowed position where it is overlapped on the inclined wall 45. In this stowed position, the rampway 80 is integrated with the inclined wall 45, and therefore extends upward at an incline toward the center and stern in the transverse direction of the ship. Furthermore, by placing the rampway 80 in the stowed position, the vehicle entrance 46 is blocked from the outside by the rampway 80.

[0037] As shown in Figure 2, the rampway 80 in the bridge position does not interfere with the superstructure 30. That is, both ends of the stern end of the central structure 32 in the ship's width direction are cut out, thereby avoiding interference between the rampway 80 in the bridge position and the central structure 32. Furthermore, no structures are provided in the range of motion when the rampway 80 is displaced between the bridge position and the stowed position, so the displacement of the rampway 80 is not hindered. That is, because a constricted portion C is formed in the superstructure 30, the range of motion of the rampway 80 is not encroached upon by other structures.

[0038] <Action and effect> In the ship 1 configured as described above, as shown in Fig. 2, vehicles are loaded and unloaded with the bow and stern direction of the ship 1 aligned with the longitudinal direction of the quay Q. That is, when vehicles are to be loaded, the ship 1 is docked at the quay Q and the rampway 80 is displaced to the bridge position, so that the rampway 80 touches down on the quay Q. When the rampway 80 touches down, the rotation angle of the first slope 81 about the first axis O1 relative to the vehicle boarding entrance 46 and the rotation angle of the second slope 82 about the second axis O2 relative to the first slope 81 are adjusted appropriately. This allows the vehicle to touch down with the inclination angle of each slope set to less than the maximum allowable climbing angle, regardless of the tide level.

[0039] The vehicles then travel from quay Q via rampway 80 and vehicle boarding entrance 46 to vehicle boarding deck 60, and then move onto vehicle deck 70 via connecting slope 75. This allows the vehicles to be loaded onto vehicle deck 70. When the vehicles disembark, they reach quay Q by taking the reverse route of the boarding route. When ship 1 is sailing, rampway 80 is displaced from the bridge position to the storage position, thereby blocking vehicle boarding entrance 46.

[0040] According to the ship 1 of this embodiment, the vehicle boarding opening 46 is provided on the hull 10 at a ship height position above the freeboard deck, above the ship's side 11, and toward the center in the ship's width direction. Therefore, the vehicle boarding opening 46 is not immersed in seawater, that is, it is not directly exposed to seawater. Therefore, when the rampway 80 is in the retracted position and the vehicle boarding opening 46 is closed, there is no need to provide a watertight structure to prevent seawater from entering through the vehicle boarding opening 46.

[0041] If the rampway 80 in the storage position were located on the ship's side 11, the rampway 80 would naturally be submerged in seawater or exposed to seawater by waves, just like the ship's side 11. In this case, a watertight structure would need to be provided around the rampway 80 to prevent seawater from entering from around the rampway 80. Due to the size of the rampway 80, which is used by vehicles to board and disembark, the watertight structure would also be large and complex. In contrast, in this embodiment, there is no need to provide such a watertight structure, and therefore the complexity of the structure that accompanies grounding of the rampway 80 can be avoided.

[0042] Generally, the longer the length of the rampway 80, the smaller the inclination angle of the rampway 80 relative to the quay Q, i.e., the longer it is possible to install the rampway 80 on the quay Q at an inclination angle equal to or less than the maximum allowable climbing angle for a vehicle. However, if the length of the rampway 80 is long, it becomes difficult to install the rampway 80 while the ship 1 is berthing, especially if the depth of the quay Q is short.

[0043] In this regard, in this embodiment, the rampway 80 extends from the vehicle boarding entrance 46 outward in the ship's width direction and diagonally in the bow-stern direction, and is bridged to the quay Q. Therefore, the length of the rampway 80 that overhangs in the ship's width direction can be reduced while ensuring the overall length of the rampway 80 from the vehicle boarding entrance 46 to the touchdown point. This makes it possible to properly touchdown the quay Q, even with a narrow depth, at an angle that is equal to or less than the maximum allowable climbing angle of the vehicle.

[0044] In particular, at high tide, the difference in elevation between the vehicle boarding entrance 46 and the quay Q in the ship height direction becomes large, so in order to make the inclination angle of the rampway 80 equal to or less than the maximum allowable climbing angle of the vehicle, it is necessary to ensure a correspondingly long overall length of the rampway 80. Even in such a case, in this embodiment, by extending the rampway 80 in the diagonal direction as described above, it is possible to prevent the rampway 80 from protruding outward in the ship width direction while ensuring the overall length of the rampway 80.

[0045] Furthermore, the rampway 80 of this embodiment extends in a straight line obliquely, with no right-angle or curved bends; in other words, the rampway 80 does not have any turning points for changing the direction of travel of a vehicle. This makes it possible to avoid making the structure of the rampway 80 more complex. Furthermore, there is no need to consider the case where a large vehicle, such as a large truck, turns on the rampway 80. This makes it possible to use the entire length of the rampway 80 effectively and achieve touchdown with a reduced angle of inclination.

[0046] Furthermore, if the rampway 80 protrudes significantly in the ship's width direction, a heeling moment will occur around the bow and stern, reducing the ship's stability. However, in this embodiment, the amount of protrusion of the rampway 80 can be reduced, thereby ensuring the stability of the ship 1.

[0047] Here, when the ship 1 is berthed at a quay Q with a short berthing length, the bow and stern of the ship will protrude beyond the quay Q. In this case, it becomes difficult to ground the rampway 80 on the quay Q.

[0048] In contrast to this, in this embodiment, the vehicle boarding entrance 46 is located in an area close to the center, which is slightly biased toward the stern from the center in the bow-stern direction, but the opening direction of the vehicle boarding entrance 46 and the extension direction of the ramp way 80 are outward in the width direction of the ship and toward the center in the bow-stern direction. Therefore, the point where the ramp way 80 touches the quay Q is near the center in the bow-stern direction. Here, near the center in the bow-stern direction means a position even closer to the center in the bow-stern direction than the vehicle boarding entrance 46. Therefore, even if the length of the quay Q is short, it is possible to properly board and disembark vehicles.

[0049] Furthermore, if a vehicle boarding entrance 46 is provided that opens in an unintentional diagonal direction and an attempt is made to ensure the range of motion of the rampway 80 in response to this, it may become necessary to significantly cut away a portion of the superstructure 30 or the hull 10. In this regard, by providing a minimally narrowed portion C only in a portion of the superstructure 30 in the bow-stern direction, and by forming the vehicle boarding entrance 46 on the outer wall surface that forms this narrowed portion C, it is possible to ensure the range of motion of the rampway 80 while also ensuring the volume of the superstructure 30.

[0050] Furthermore, in this embodiment, a watertight structure around the rampway 80 is not required, and therefore it is possible to avoid making the structure around the rampway 80 more complicated. Therefore, even if there is offshore work equipment around the rampway 80, such as a fueling mast 50 for supplying oil to other ships, work using the offshore work equipment will not be hindered by the equipment around the rampway 80. In other words, interference between the fuel mast 50, fuel hose, etc. and peripheral equipment of the rampway 80 can be avoided, and sufficient space can be secured for offshore operations such as fueling work.

[0051] In addition, in this embodiment, a vehicle boarding deck 60 connected to the vehicle entrance 46 is provided below the vehicle deck 70, and the vehicle deck 70 and the vehicle boarding deck 60 are connected to each other by a connecting slope 75. In other words, the vehicle entrance 46 can be positioned lower without being adjusted to the same height as the vehicle deck 70. This also positions the connection point of the rampway 80 to the ship 1 lower. Therefore, the rampway 80 can be appropriately placed on the ground so that it is equal to or less than the maximum allowable climbing angle of the vehicle, without excessively increasing the length of the rampway 80. Furthermore, the height from the vehicle entrance deck 60 to the ceiling surface within the stern structure 40 can be ensured, allowing tall vehicles to enter the ship 1.

[0052] Furthermore, the rampway 80 in the stowed position is configured to extend at an angle toward the center in the ship's width direction as it extends from the bottom to the top, which allows the exterior shape of the ship 1 to be compact. Therefore, when performing offshore work, such as refueling work for other ships, the rampway 80 in the stowed state does not get in the way, and offshore work can be carried out smoothly.

[0053] <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.

[0054] For example, in the embodiment, the vehicle boarding entrance 46 and rampway 80 are provided only on the starboard side, but they may be provided on the port side instead of the starboard side, or on both the starboard and port sides. Furthermore, the vehicle boarding entrance 46 and the ramp way 80 may be provided not only in the stern structure 40 but also in the central structure 32 or the bow structure 31. In other words, the vehicle boarding entrance 46 and the ramp way 80 may be provided at any location in the superstructure 30. Accordingly, the vehicle boarding deck 60 and the vehicle deck 70 may be provided at any location within the superstructure 30.

[0055] In addition, in the embodiment, the vehicle boarding entrance 46 is positioned at a position biased toward the stern, and the opening direction of the vehicle boarding entrance 46 is toward the outside in the width direction of the ship and diagonally toward the center in the bow-stern direction (bow side), but this is not limited to this. For example, the vehicle boarding entrance 46 may be provided on a bow-side structure 31 biased toward the bow, and the opening direction of the vehicle boarding entrance 46 may be diagonally outward in the width direction of the ship and toward the center in the bow-stern direction (stern side). In other words, it is sufficient that the opening direction of the vehicle boarding entrance 46 is on the outside in the width direction of the ship and on the center side in the bow and stern direction, and that the rampway 80 is configured to extend in the opening direction.

[0056] Furthermore, in the embodiment, an example has been described in which the vehicle boarding opening 46 opens into the outer wall surface that forms the constricted portion C, but this is not limited to this. For example, the vehicle boarding opening 46 may be provided at one corner in the ship's width direction at the bow-stern end of the superstructure 30. It should be noted that the constricted portion C does not necessarily have to be provided on both the starboard side and the port side, but may be provided on either the starboard side or the port side.

[0057] Furthermore, in the above embodiment, the inclined wall 45 having the vehicle entrance 46 is provided on the stern structure 40, but this is not limitative. For example, it may be provided on the bow structure 31 or on an intermediate structure.

[0058] Furthermore, in the embodiment, a fueling mast 50 capable of fueling other ships is used as the offshore work facility, but the present invention is not limited to this. For example, the offshore work facility may be a fishing facility for whaling or other fishing purposes, or a variety of facilities may be used, such as construction facilities for offshore structures, research facilities for marine surveys, etc. Even in these cases, the rampway 80 does not interfere with the work, allowing various operations to be carried out smoothly. The offshore work facility does not need to be installed on an intermediate structure, but may be installed in another location that does not interfere with the rampway 80.

[0059] Furthermore, in the embodiment, an example has been described in which the superstructure 30 is composed of three structures: the bow structure 31, the intermediate structure, and the stern structure 40, but the form of the superstructure 30 is not limited. The superstructure 30 may be composed of only a single structure, or may be composed of four or more structures.

[0060] In addition, in the embodiment, an example has been described in which a vehicle deck 70 and a vehicle boarding deck 60 of different heights are provided, but the installation of the vehicle boarding deck 60 may be omitted by aligning the height of the vehicle deck 70 with the height of the lower end of the vehicle boarding entrance 46.

[0061] Furthermore, in the embodiment, an example has been described in which the rampway 80 is composed of two slopes, the first slope 81 and the second slope 82, but the rampway 80 may also be composed of a single slope, or may be composed of three or more slopes.

[0062] Various configurations can be used for the rampway 80. For example, it may be an elevator-type configuration in which the position of the rotation axis along the vehicle entrance 46 slides in the ship height direction. Furthermore, when the rampway is made up of multiple slopes, a configuration may be used in which the position in the ship height direction of the rotation axis connecting adjacent slopes can be adjusted as needed.

[0063] <Other embodiments> Although the embodiment of the present invention has been described above, the present invention is not limited to this and can be modified as appropriate within the scope of the technical idea of ​​the invention.

[0064] <Additional Notes> The ship 1 described in each embodiment can be understood, for example, as follows.

[0065] (1) A vessel 1 according to a first aspect comprises a hull 10 having a pair of side walls 11, a superstructure 30 provided on the hull 10, positioned closer to the center of the ship's width than the side walls 11, and having a vehicle boarding entrance 46 that opens outward in the ship's width and diagonally in the bow-stern direction, a vehicle deck 70 provided within the superstructure 30 and connected to the vehicle boarding entrance 46, and a rampway 80 that is displaceable between a storage position that is arranged along the vehicle boarding entrance 46 to block the vehicle boarding entrance 46 from the outside, and a bridge position that extends diagonally from the vehicle boarding entrance 46 in the opening direction of the vehicle boarding entrance 46 and is grounded on a quay Q near the center of the ship's width.

[0066] According to the above configuration, the vehicle boarding entrance 46 is located above the ship's side 11 and in the center of the ship's width, and the rampway 80 in the stowed position is arranged along the vehicle boarding entrance 46. Therefore, there is no need to provide a watertight structure for the opening and closing structure of the rampway 80. In addition, by extending the rampway 80 in a diagonal direction, there is no need to provide a turning section on the rampway 80 to change the direction of travel of the vehicles. This makes it possible to avoid making the structure of the entire ship 1 more complicated. Furthermore, by grounding the rampway 80 near the center of the quay Q in the bow-stern direction, the rampway 80 can be properly grounded without unnecessarily extending its length even if the quay Q is short. Furthermore, because the rampway 80 extends diagonally across the quay Q, it is possible to reduce the protrusion length in the width direction of the ship while ensuring the overall length of the rampway 80. Therefore, even when the quay Q has a narrow depth, the vehicle can properly land on the quay Q at an angle equal to or less than the maximum allowable climbing angle of the vehicle.

[0067] (2) The vessel 1 according to the second aspect is the vessel 1 of (1), in which the vehicle boarding opening 46 is located on the bow or stern side of the center of the bow and stern of the hull 10, and opens diagonally outward in the width direction and toward the center of the bow and stern.

[0068] According to the above configuration, even when the ship 1 is docked at a short quay Q, the rampway 80 can be more appropriately constructed between the ship 1 and the quay Q.

[0069] (3) The vessel 1 according to the third aspect is the vessel 1 of (2), wherein the superstructure 30 has a constricted portion C formed in a part of the bow-stern direction such that the outer wall surface is recessed toward the center in the width direction of the vessel, and the vehicle boarding entrance 46 opens into the outer wall surface that forms the constricted portion C.

[0070] This allows the diagonally opening vehicle entrance 46 to be properly formed while ensuring the volume of the superstructure 30 without significantly encroaching on the superstructure 30, and also ensures the range of motion of the rampway 80.

[0071] (4) The vessel 1 according to the fourth aspect is the vessel 1 according to (2) or (3), further comprising offshore work equipment on the hull 10, closer to the center of the bow and stern direction than the vehicle boarding opening 46.

[0072] According to the above configuration, the structure surrounding the rampway 80 is simplified while the rampway 80 is extended diagonally to form a bridge, thereby preventing interference between the offshore work equipment and the structure constituting the rampway 80.

[0073] (5) The vessel 1 according to the fifth aspect is the vessel 1 of (4), further comprising a fuel tank 51 located below the vehicle deck 70 within the hull 10 and storing fuel capable of refueling other vessels, and the offshore work facility further comprises a fuel mast 50 extending upward from the hull 10 and capable of refueling other vessels.

[0074] According to the above configuration, there is no need to adopt a watertight structure, and the structure of the ship 1 can be avoided from becoming complicated, so that the equipment related to the rampway 80 can be prevented from interfering with refueling operations.

[0075] (6) The vessel 1 according to the sixth aspect is any one of the vessels 1 of (1) to (5), further comprising a vehicle boarding deck 60 provided inside the superstructure 30, adjacent to the vehicle boarding entrance 46 and located below the vehicle deck 70, and a connecting slope 75 provided inside the superstructure 30 and extending at an angle to connect the vehicle boarding deck 60 and the vehicle deck 70.

[0076] If the rampway 80 is provided to match the height of the vehicle deck 70, the overall length of the rampway 80, which touches the ground at or below the maximum allowable climbing angle of the vehicle, will be long. In contrast, by providing the vehicle boarding deck 60 connected to the rampway 80 below the vehicle deck 70, it is possible to shorten the overall length of the rampway 80 while maintaining the height of the vehicle deck 70.

[0077] (7) The vessel 1 according to the seventh aspect is any one of the vessels 1 of (1) to (6), wherein the rampway 80 extends in the storage position at an incline toward the center of the vessel's width as it moves from bottom to top.

[0078] According to the above configuration, the outer shape of the vessel 1 with the rampway 80 in the retracted position can be made compact. [Explanation of symbols]

[0079] 1...Vessel 10...Hull 11...Side 12...Bottom 15...Propeller 16...Rudder 20...Upper deck 30...Superstructure 31...Bow structure 32...Central structure 33...Central sidewall 34...Central ceiling wall 35...Angular wall 40...Aft structure 41...Aft sidewall 42...Aft wall 43...Fore wall 44...Aft ceiling wall 45...Sloped wall 46...Vehicle access 50...Fueling mast (offshore work equipment) 51...Fuel tank 60...Vehicle access deck 70...Vehicle deck 71...Fore vehicle deck 72...Aft vehicle deck 75...Connecting slope 80...Rampway 81...First slope 82...Second slope C...Narrow section O1...First axis O2...Second axis Q...Wharf

Claims

1. a hull having a pair of sides; a superstructure provided on the hull, positioned closer to the center in the ship's width direction than the ship's side, and having a vehicle boarding entrance that opens outward in the ship's width direction and obliquely in the bow-stern direction; A vehicle deck provided within the superstructure and connected to the vehicle boarding entrance; a rampway that is displaceable between a bridge position that extends from the vehicle boarding entrance in a diagonal direction that is the opening direction of the vehicle boarding entrance and is grounded on the quay wall near the center in the bow-stern direction, and a storage position that is arranged along the vehicle boarding entrance and blocks the vehicle boarding entrance from the outside, The vehicle entrance is located on the bow side or the stern side of the center of the hull in the bow-stern direction, The opening is diagonally outward in the ship width direction and toward the center in the bow and stern direction, the upper structure has a constricted portion formed such that a part of the upper structure in the bow-stern direction is recessed toward the center in the width direction of the ship, The vehicle entrance is an opening in an outer wall surface that forms the narrowed portion.

2. The vessel according to claim 1 , further comprising an offshore work facility located on the hull toward the center of the bow and stern direction from the vehicle boarding opening.

3. The vessel further comprises a fuel tank provided below the vehicle deck within the hull and storing fuel capable of refueling other ships, The vessel according to claim 2 , wherein the offshore work facility further comprises an oil supply mast extending upward from the hull and capable of supplying oil to the other vessel.

4. A vehicle boarding deck provided inside the superstructure, adjacent to the vehicle boarding entrance and located below the vehicle deck; A connecting slope provided inside the superstructure and extending at an angle so as to connect the vehicle boarding deck and the vehicle deck; The watercraft of claim 1 further comprising:

5. The vessel according to any one of claims 1 to 4, wherein the rampway extends at an incline toward the center in the width direction of the vessel as it extends from below to above in the storage position.

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