A ship equipped with a roll reduction device

Abstract

To provide a ship including a stabilizer in which a tank part can be provided in a hull.SOLUTION: A ship 1 includes: a plurality of support legs 32 to 35 which are erected on a poop deck at a hull 2 and support a pair of left and right tank parts 21L, 21R at positions higher than the poop deck; and reinforcement steel materials 81a to 81f serving as reinforcement members which reinforce a hull structure 50 provided below the poop deck. The plurality of support legs 32 to 35 are disposed at an area above the reinforcement steel materials 81a to 81f or positions near the area.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a ship equipped with a roll damping device for suppressing the rocking of the hull.

Background Art

[0002] Conventionally, as a device for suppressing the rolling of a ship, an anti-rolling tank (ART) that suppresses the rolling moment acting on the ship due to disturbances by the moment generated by the movement of liquid between a pair of left and right tank parts mounted on the hull is also known.

[0003] When installing this type of roll damping device on a ship, if the anti-rolling tank is arranged below the exposed deck, the original cargo volume of the ship is reduced, and since the center of gravity position of the roll damping device is close to the center of gravity position of the hull, a large roll damping effect cannot be expected. Therefore, for example, there is a method of providing an anti-rolling tank integrally with the bridge under the bridge provided on the deck of the hull to improve the roll damping effect without significantly reducing the cargo volume (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] This type of anti-rolling tank is basically provided when a new ship is built, but it is also desired to provide an anti-rolling tank retrofitted to an existing ship to enhance the roll damping effect.

[0006] However, in a ship equipped with the anti-rolling device described in Patent Document 1 above, when the ship is newly built, a bridge integrated with an anti-rolling tank is newly manufactured, and it is not possible to retroactively install such an anti-rolling tank on the bridge of an existing ship. When an anti-rolling tank is provided using a structure such as a bridge erected on the deck, since an existing ship does not originally have the strength necessary to support a tank portion filled with liquid and having a large weight due to its structure, there has been a problem that it is difficult to retroactively install an anti-rolling tank on an existing ship.

[0007] The present invention has been made paying attention to such problems, and an object thereof is to provide a ship equipped with an anti-rolling device capable of retroactively installing a tank portion on an existing hull.

Means for Solving the Problems

[0008] In order to solve the above problems, a ship equipped with the anti-rolling device of the present invention is a ship equipped with an anti-rolling device that suppresses the rocking of the hull by the movement of liquid between a pair of left and right tank portions, a plurality of support legs erected on an exposed deck at the stern of an existing hull and supporting the pair of left and right tank portions at a position above the exposed deck, a reinforcing member for reinforcing the hull structure provided below the exposed deck, and the plurality of support legs are arranged above or in the vicinity of the upper part of the reinforcing member. According to this feature, without using a bridge or the like on the deck, a heavy tank portion can be stably supported at a portion with high strength on the exposed deck at the stern. In addition, a pair of left and right tank portions can be retroactively installed at the stern without impairing the installation space and working space for deck fittings and the like on the exposed deck.

[0009] The reinforcing member is characterized in that it is provided bridging the exposed deck and an existing member constituting the hull structure. According to this feature, the support legs can be stably supported by utilizing the support strength of the existing members.

[0010] The stern part of the hull is formed in a substantially tapered shape in plan view that gradually narrows toward the rear. At least a part of the plurality of support legs is arranged in a substantially inverted V shape in plan view along the outer hull plate of the stern part. According to this feature, the support strength against the lateral load and torsion caused by the movement of the liquid between the left and right is increased.

[0011] At least some of the adjacent support legs among the plurality of support legs are connected by a truss structure. According to this feature, it becomes difficult for the support legs to be deformed by the bending moment, and the support strength is increased.

[0012] At least a part of the plurality of support legs is characterized in that the cross-sectional shape is a rectangular shape. According to this feature, it becomes difficult for the support legs to be deformed, and the support strength is increased.

[0013] The left and right width dimensions of the pair of left and right tank parts are characterized by being equal to or less than the maximum left and right width dimensions of the hull. According to this feature, it is possible to prevent the tank part from getting in the way when performing operations such as docking and mooring line attachment without changing the basic specifications of the existing hull.

[0014] The left and right width dimensions of the pair of left and right tank parts are characterized by being the same as the maximum left and right width dimensions of the hull. According to this feature, it is possible to maximize the anti-rolling effect of the pair of left and right tank parts without changing the basic specifications of the existing hull.

Brief Description of the Drawings

[0015]

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Embodiments for Carrying Out the Invention

[0016] Embodiments for implementing a ship equipped with a roll reduction device according to the present invention will be described below based on examples.

Examples

[0017] A ship equipped with a roll reduction device as an example of the present invention will be described with reference to FIGS. 1 to 6. In the following description, the bow side of the ship is referred to as the front of the hull, and the stern side of the ship is referred to as the rear of the hull. Also, in a plan view, the direction orthogonal to the traveling direction is referred to as the width direction or the left-right direction.

[0018] As shown in FIG. 1, a ship 1 (hereinafter abbreviated as ship 1) equipped with a roll reduction device as an example of the present invention is a multi-purpose cargo ship capable of loading steel products such as hot coils, industrial machinery, and bulk cargo such as coal and rock salt as main cargo, and is an ocean-going ship with a deadweight exceeding 20,000 tons. Note that the ship 1 is not limited to the above cargo ship, and may be a passenger ship, a ferry, a tanker, etc., and the ship type to which the roll reduction device is applied is arbitrary.

[0019] As shown in FIGS. 2 to 4, a plurality of cargo holds 3 provided between the bow part 2F and the stern part 2B of the hull 2 can accommodate a plurality of cargos C such as containers, and a plurality of cargo handling devices 5 are provided in the vicinity of each hatch 3a on the upper deck 4U. On the poop deck 4P at the stern part 2B, a bridge 6 having a steering room 6a and a funnel 7 are provided, and a roll reduction device 20 for suppressing the sway (especially rolling) of the hull 2 is retrofitted to the existing hull 2 on the stern side of the bridge 6 and the funnel 7 as will be described later.

[0020] As shown in FIG. 3, the left-right width dimension L1 (overall width L1) at the center of the hull 2 of the hull 2 is the maximum left-right width dimension (maximum width) of the hull 2. The bow part 2F is formed in a substantially tapered shape in a plan view in which the left-right width dimension gradually becomes narrower toward the bow. Also, the stern part 2B is formed in a substantially tapered shape in a plan view in which the left-right width dimension gradually becomes narrower toward the stern, and the left-right width dimension L2 of the rearmost end (stern outer plate 8b) of the stern part 2B is shorter than the left-right width dimension L1 (L2 < L1). Note that in this embodiment, the left-right width dimension of the stern part 2B is formed in a substantially tapered shape in a plan view in which it gradually becomes narrower toward the stern, but the left-right width dimension of the stern part 2B may be the same as the maximum left-right width dimension of the hull 2.

[0021] As shown in FIGS. 5(a) and 5(b), the anti-rolling device 20 includes a tank body 21 composed of a pair of left and right tank portions 21L and 21R respectively arranged on the port side and starboard side of the hull 2, and a communication passage portion 21C that communicates the lower portions of the tank portions 21L and 21R with each other. A damper 22 provided in the communication passage portion 21C for adjusting the rocking period of the liquid W (anti-rolling water) filled in the tank body 21 by opening and closing, a plurality of (three in the embodiment) air ducts 23 (see FIG. 5(b)) for communicating the upper portions of the tank portions 21L and 21R with each other to allow the air in the tank portions 21L and 21R to flow, an air valve 24 provided in each air duct 23 for restricting the air flow by opening and closing to switch the operation or stop of the liquid W in the tank body 21, and a control device (not shown) for performing drive control of the damper 22, the air valve 24, etc. Further, a baffle plate 25 for suppressing the behavior of the liquid W is provided in the tank portions 21L and 21R.

[0022] Note that the liquid W filled in the tank body 21 may be fresh water, seawater, or other liquids. Also, the communication passage portion 21C may be constituted by a pipe or the like, and in this case, the damper 22 may be replaced with an openable and closable valve or the like. Note that the damper 22 and the valve do not necessarily have to be provided.

[0023] The anti-rolling device 20 is a device that, against the force (moment) that tries to tilt the hull 2 left and right caused by waves and wind, causes the liquid W in the pair of left and right tank portions 21L and 21R to move left and right with a 90-degree phase difference with respect to the roll natural period of the hull due to the tilt of the hull 2, generates a force (opposite moment) that tries to tilt the hull 2 to the opposite side, and aims to reduce the roll amplitude (angle).

[0024] Note that the anti-rolling device 20 may be a variable period type anti-rolling device 20 in which the rocking period of the liquid W can be adjusted, for example, by providing a damper 22 in the communication passage portion 21C as in this embodiment, as long as it suppresses the rocking of the hull 2 at least by the movement of the liquid W between the pair of left and right tank portions. It may also be a fixed period type anti-rolling device (not shown) in which the liquid W naturally rocks due to the tilt of the hull, and various changes can be made to the functions, structures, etc.

[0025] As shown in FIGS. 5 and 6, the tank body 21 is disposed on a base portion 31 made of steel material or the like, and the base portion 31 is supported on the upper portions of a plurality of support legs 32 to 35 erected on the upper surface of the poop deck 4P.

[0026] Specifically, as shown in FIG. 6, the support leg 32 is erected vertically on the left and right along the trailing edge portion on the upper surface of the poop deck 4P, the support leg 33 is erected vertically on the rear portions of the left and right edges on the upper surface of the poop deck 4P, the support leg 34 is erected vertically at a position in front of the support leg 33 at the left and right edge portions on the upper surface of the poop deck 4P, and the support leg 35 is erected vertically at a position in front of the support leg 34 at the left and right edge portions on the upper surface of the poop deck 4P. That is, the support legs 32 to 35 are arranged symmetrically with respect to the left and right.

[0027] As shown in FIG. 5, the tank body 21 is formed in a substantially U shape that is open upward in a rear view, and as shown in the shaded area in FIG. 6 in a plan view, the left and right width dimension L11 of the tank body 21 is larger than the left and right width dimension L2 of the rearmost end (the stern outer plate 8b) of the stern part 2B and is substantially the same as the maximum left and right width dimension L1 of the hull 2. Therefore, the left and right sides (the left downward diagonal shaded area in FIG. 6) of the left and right tank portions 21L and 21R of the tank body 21 project outward from the left and right ship side outer plates 8a of the poop deck 4P of the stern part 2B from the rear end to the front end.

[0028] Note that the tank body 21 is not necessarily limited to this embodiment, and may be arranged inside the ship side outer plate 8a without projecting outward from the left and right ship side outer plates 8a near the central portion of the hull 2. By doing so, when docking or taking a mooring line, etc., the tank portions 21L and 21R that project outward from the left and right ship side outer plates 8a of the stern part 2B are prevented from interfering with structures such as quay walls, and the left and right width dimension L11 of the pair of left and right tank portions 21L and 21R can be made as long as possible to increase the anti-rolling effect.

[0029] As shown in Fig. 4(b), the upper front surface of the support leg 32 and the rib member 32a are fixed to the rear surfaces of the base portion 31 and the tank portions 21L and 21R by welding or the like. Also, the upper rear surface of the support leg 35 and the rib member 35a are fixed to the front surfaces of the base portion 31 and the tank portions 21L and 21R by welding or the like. Thus, the tank portions 21L and 21R are supported in a state of being sandwiched from the front and rear sides by the support legs 32 and 35, so that the support strength against the rocking of the tank body 21 in the front-rear direction is increased.

[0030] Also, as shown in Fig. 5(b), since the pair of left and right support legs 32 and 32 are connected in a truss structure by two connecting frames 38 arranged in an X shape when viewed from the rear, it becomes difficult for the left and right support legs 32 to deform due to the bending moment, and the support strength against the lateral rocking (rocking in the left-right direction) of the tank body 21 is increased. Further, the support legs 33 and 34 are fixed to the lower surface of the base portion 31 by welding or the like at the upper portions directly below the left and right tank portions 21L and 21R, so that the left and right tank portions 21L and 21R whose weights increase due to the increase of the liquid W are stably supported.

[0031] Also, as shown in Fig. 6, the left and right support legs 33, 34, and 35 are arranged in a substantially inverted V shape in plan view along the ship's side outer plate 8a such that the left and right support legs 33, 34, and 35 approach each other toward the stern side. In this way, since the three support legs 33, 34, and 35 are arranged so as to obliquely cross the left-right direction which is the moving direction of the liquid W, the support strength against the lateral rocking (rocking in the left-right direction) of the tank body 21 is increased, and thus the tank body 21 is stably supported.

[0032] Also, since the support legs 32 to 35 are arranged at intervals in the front-rear direction along the ship's side outer plate 8a, various operations can be performed by effectively using the area below the tank body 21 on the upper surface of the poop deck 4P, and a mooring line or the like can be lowered from between the support legs 32 to 35, and the view to the rear and the left and right sides can be secured.

[0033] As shown in Fig. 2, the stern part 2B of the hull 2 has a shallower upper hull part because the propeller and rudder are arranged below, and a steering device and the like are arranged, so there is originally no space for arranging the cargo hold 3 below the poop deck 4P. Therefore, even if the tank body 21 of the anti-rolling device 20 is installed in the stern part 2B, the number of loaded goods will not decrease. On the other hand, if it is installed in a place other than the stern part 2B, the cargo hold 3 cannot be provided at the installation place. In addition, since the longer the distance of the liquid W moving left and right in the tank body 21, the greater the anti-rolling effect, it is better to make the left and right width dimension L11 longer. However, if it is installed on the upper surface of the poop deck 4P, there may be cases where the installation space cannot be secured depending on the equipment situation such as deck fittings.

[0034] In contrast, in the case of the anti-rolling device 20 of this embodiment, the tank body 21 including the pair of left and right tank parts 21L and 21R is located in the stern part 2B behind the bridge 6 and supported above the poop deck 4P in the stern part 2B by a plurality of support legs 32 to 35 erected along the inner side vicinity of the ship side outer plate 8a on the poop deck 4P as shown in Figs. 4(b), 5 and 6.

[0035] Specifically, as shown in Fig. 5, the vertical dimension L20 from the poop deck 4P to the base part 31 of the tank body 21 is a predetermined dimension (for example, L20 = about 2500 mm or more, etc.). Since a space is formed below the tank body 21, crew members and the like can pass through the space formed below the tank body 21 to the stern and perform various operations. Incidentally, if the vertical dimension L20 from the poop deck 4P to the base part 31 of the tank body 21 is at least 1800 mm, it is effective as a space for crew members and the like to perform various operations. Also, as shown in Fig. 6, existing deck fittings such as the mooring machine 41, bitts 42, hatch cover 43 and electrical equipment (not shown) are arranged on the upper surface of the poop deck 4P of the stern part 2B. By supporting the tank body 21 above the poop deck 4P, the tank body 21 can be provided in the stern part 2B without interfering with these deck fittings. That is, for example, even in an existing ship 1 without an anti-rolling device, the tank body 21 can be retrofitted in the stern part 2B.

[0036] Also, as shown in FIG. 2, the tank main body 21 is arranged at a position on the stern side of the bridge 6 in the stern part 2B, that is, at a position behind the bridge 6. Specifically, the tank main body 21 is arranged further behind the funnel 7 arranged behind the bridge 6, and the separation dimension L24 from the navigation bridge deck 4N, which is a part of the bridge 6, to the tank main body 21 is made longer than the front-rear dimension L23 of the tank main body 21 (L24 > L23). Also, as shown in FIGS. 4(a) and 5(a), the vertical dimension L21 from the upper surface of the poop deck 4P to the upper part of the tank main body 21 is shorter than the vertical dimension L22 from the upper surface of the poop deck 4P to the navigation bridge deck 4N where the steering room 6a of the bridge 6 is located (L21 < L22).

[0037] The rear visibility from the steering room 6a and the navigation bridge deck 4N is less important than the front and left and right side visibilities, and originally, a part of the rear visibility is blocked by the existing funnel 7. And the tank main body 21 of this embodiment is not in the immediate vicinity of the bridge 6 but is separated rearward from the bridge 6, and moreover, it is arranged so as to be hidden below the navigation bridge deck 4N behind the funnel 7, so it does not have a great impact on the rear visibility from the steering room 6a of the bridge 6 and the navigation bridge deck 4N. Therefore, the tank parts 21L and 21R can be provided above the upper surface of the poop deck 4P (exposed deck) with a high anti-rolling effect.

[0038] Also, as shown in Fig. 5(a), the tank sections 21L and 21R are supported by the support legs 32 to 35 at a position above the poop deck 4P. By doing so, compared to the case of installing them below the poop deck 4P, the center-of-gravity position g of the tank body 21 can be set higher than the center-of-gravity position G of the ship 1. As a result, the distance from the center-of-gravity position G of the hull 2 to the center-of-gravity position g of the liquid W in the tank body 21 can be increased. Also, a part of the left and right tank sections 21L and 21R can be arranged by utilizing the space outside the left and right ship side outer plates 8a of the narrow stern part 2B. Thereby, the lateral movement distance of the liquid W can be increased, so that the anti-rolling moment can be increased, that is, the anti-rolling effect can be maximally enhanced. For this reason, the amount (weight) of the liquid in the tank body 21 required to obtain the same anti-rolling moment can be reduced, and the decrease in the cargo capacity (weight) of the cargo C caused by the installation of the anti-rolling device 20 can also be suppressed.

[0039] Next, the relationship between the support legs 32 to 35 and the hull structure 50 provided below the poop deck 4P will be described with reference to Figs. 7 to 13. Since the hull structure 50 below the stern part 2B is configured to be substantially bilaterally symmetric, hereinafter, mainly the hull structure 50 on the port side of the stern part 2B will be described, and the description of the hull structure 50 on the starboard side will be omitted.

[0040] As shown in Figs. 7 and 8(a) to (c), below the poop deck 4P in the stern part 2B, a plurality of longitudinal beams 51a to 51f extending in the front-rear direction are arranged at intervals in the left-right direction, and a plurality of transverse beams 61a to 61o extending in the left-right direction so as to straddle these longitudinal beams 51a to 51f are arranged at intervals in the front-rear direction. Also, on the rear end side of each of the longitudinal beams 51a to 51f, a plurality of ribs 71a to 71e extending in the vertical direction along the stern outer plate 8b of the stern are arranged at intervals in the left-right direction, and on the left end side of each of the transverse beams 61a to 61o, a plurality of ribs 72a to 72o extending in the vertical direction along the ship side outer plate 8a are arranged at intervals in the front-rear direction.

[0041] On the upper parts of the longitudinal beams 51a to 51f and the transverse beams 61a to 61o that are combined in a roughly lattice pattern in plan view, the poop deck 4P is fixed by welding or the like. Incidentally, longitudinal beams 51a to 51f and transverse beams 61a to 61o are also provided below the longitudinal beams 51a to 51f and the transverse beams 61a to 61o, and the upper deck 4U is fixed to these upper parts.

[0042] Among the transverse beams 61a to 61o, for the transverse beams 61a, 61d, 61h, 61l, 61o, steel materials with longer vertical width dimensions and higher strength than the other transverse beams 61b, 61c, 61e to 61g, 61i to 61k, 61m, 61n (see Fig. 8(b)) are adopted (see Fig. 8(c)). Also, among the ribs 72a to 72o, for the ribs 72a, 72d, 72h, 72l, 72o, steel materials with longer left - right width dimensions and higher strength than the other ribs 72b, 72c, 72e to 72g, 72i to 72k, 72m, 72n (see Fig. 8(b)) are adopted (see Fig. 8(c)).

[0043] These longitudinal beams 51a to 51f, transverse beams 61a to 61o, and ribs 71a to 71e, 72a to 72o constitute the hull structure 50 provided below the poop deck 4P. Incidentally, the hull structure 50 is an example, and it may include steel materials and the like not shown in the above longitudinal beams 51a to 51f, transverse beams 61a to 61o, and ribs 71a to 71e, 72a to 72o.

[0044] The support legs 32 to 35 are erected on the upper surface of the poop deck 4P, but at least a part of them is arranged to be supported by the lower hull structure 50. Also, a reinforcing member to be described later is fixed and reinforced at the lower positions of the support legs 32 to 35 in the hull structure 50. Hereinafter, the positional relationship between each of the support legs 32 to 35 and the hull structure 50 will be described based on Figs. 9 to 16.

[0045] First, regarding the positional relationship between the support leg 32 and the hull structure 50, as shown in FIGS. 9 and 10, the support leg 32 is formed in a square tube shape by assembling four steel plates 82a to 82d extending in the vertical direction as shown in FIGS. 9 and 10. More specifically, the steel plates 82a to 82d constituting the support leg 32 are formed in a substantially rectangular shape that is long in the left-right direction in a plan sectional view. A support plate 83a having a substantially square frame shape in a plan view is fixed to the lower end of the support leg 32 by welding or the like. Then, by fixing the support plate 83a to the upper surface of the poop deck 4P by welding or the like, the support leg 32 is erected on the upper surface of the poop deck 4P via the support plate 83a.

[0046] Also, a part of the steel plates 82b and 82d is disposed directly above the rib 71b, the steel plate 82d is disposed along the front-rear direction directly above the longitudinal beam 51a, and the steel plate 82a is disposed along the left-right direction directly above the transverse beam 61a.

[0047] Further, as shown in FIGS. 9(a), (b) and 10, a reinforcing steel material 81a extending in the vertical direction is fixed to the longitudinal beam 51b and the rib 71b by welding or the like at a position below the longitudinal beam 51b directly below the steel plate 82d and directly below the steel plate 82c. In this way, the front wall and the right wall of the support leg 32 are disposed directly above the hull structure 50, and the lower part of the steel plates 82c and 82d in the hull structure 50 is reinforced by the reinforcing steel material 81a, so that the support leg 32 is stably supported. Also, since the support leg 32 is formed in a substantially rectangular shape that is long in the left-right direction in a plan sectional view, the support force against the force (moment) that tries to tilt the hull 2 to the left and right is high.

[0048] Next, regarding the positional relationship between the support leg 33 and the hull structure 50, as shown in FIGS. 11 and 12, the support leg 33 is formed in a square tube shape by assembling four steel plates 82e to 82h extending in the vertical direction. More specifically, the steel plates 82e to 82h constituting the support leg 33 are formed in a substantially square shape in a plan sectional view. A support plate 83b having a substantially square frame shape in a plan view is fixed to the lower end of the support leg 33 by welding or the like. Then, by fixing the support plate 83b to the upper surface of the poop deck 4P by welding or the like, the support leg 33 is erected on the upper surface of the poop deck 4P via the support plate 83b.

[0049] Also, a part of the steel plate 82f is disposed directly above the rib 72a, and the steel plate 82e is disposed along the left - right direction directly above the transverse beam 61b, and the steel plate 82f is disposed along the left - right direction directly above the transverse beam 61a.

[0050] Further, as shown in FIGS. 11(a), (b) and 12, a reinforcing steel material 81b extending in the left - right direction is fixed to the transverse beams 61a, 61b and the ribs 72a, 72b by welding or the like at a position below the transverse beam 61b directly below the steel plate 82e and at a position below the transverse beam 61a directly below the steel plate 82f. Also, below the reinforcing steel material 81b, a reinforcing steel material 81c having a substantially triangular shape in a rear view is fixed to the reinforcing steel material 81b and the ribs 72a, 72b by welding or the like.

[0051] In this way, since the front wall and the rear wall of the support leg 33 are disposed directly above the hull structure 50 and the lower part of the steel plates 82e, 82f in the hull structure 50 is reinforced by the reinforcing steel materials 81b, 81c, the support leg 33 is stably supported. Also, since the support leg 33 is formed in a substantially square shape in a plan sectional view, it can support the hull 2 equally against the forces (moments) attempting to tilt the hull 2 forward - backward and left - right.

[0052] Next, the positional relationship between the support leg 34 and the hull structure 50 will be described with reference to FIGS. 13 and 14. As shown in FIGS. 13 and 14, the support leg 34 is formed in a substantially U-shape in plan view with an outward opening by assembling three steel plates 82i to 82k extending in the vertical direction. At the lower end thereof, a support plate 83c having a substantially U-shape in plan view is fixed by welding or the like. Then, by fixing the support plate 83c to the upper surface of the poop deck 4P by welding or the like, the support leg 34 is erected on the upper surface of the poop deck 4P via the support plate 83c.

[0053] Further, the steel plates 82i and 82j are disposed directly above the ribs 72f and 72g. As shown in FIGS. 13(a), (b) and 14, at positions below the cross beam 61g in the vicinity of the right side of the steel plate 82i and at positions below the cross beam 61f in the vicinity of the right side of the steel plate 82j, reinforcing steel members 81d having a substantially triangular shape in rear view are fixed to the cross beams 61f and 61g and the ribs 72f and 72g by welding or the like.

[0054] In this way, since the front wall and the rear wall of the support leg 34 are disposed directly above the hull structure 50 and the positions in the vicinity below the steel plates 82i and 82j in the hull structure 50 are reinforced by the reinforcing steel members 81d, the support leg 34 is stably supported. Further, since the outer ends of the steel plates 82i and 82j extend to positions continuous with the ship side outer plate 8a in the vertical direction, the support leg 34 is stably supported by the ship side outer plate 8a.

[0055] Next, the positional relationship between the support leg 35 and the hull structure 50 will be described with reference to FIGS. 15 and 16. As shown in FIGS. 15 and 16, the support leg 35 is formed in a substantially U-shape in plan view with an outward opening by assembling three steel plates 82l to 82n extending in the vertical direction. At the lower end thereof, a support plate 83d having a substantially U-shape in plan view is fixed by welding or the like. Then, by fixing the support plate 83d to the upper surface of the poop deck 4P by welding or the like, the support leg 35 is erected on the upper surface of the poop deck 4P via the support plate 83d.

[0056] Also, a part of the steel plates 82l and 82m is disposed directly above the ribs 72k and 72l. The steel plate 82l is disposed along the left - right direction directly above the cross beam 61l, and the steel plate 82m is disposed along the left - right direction directly above the cross beam 61k.

[0057] Also, as shown in FIGS. 15(a), (b) and FIG. 16, a reinforcing steel material 81e having a substantially triangular shape in a rear view is fixed to the cross beams 61l, 61k and the ribs 72k, 72l by welding or the like at positions below the cross beam 61l directly below the steel plate 82l and below the cross beam 61k directly below the steel plate 82m. Further, a plate - shaped reinforcing steel material 81f is disposed along the steel plate 82n directly below the steel plate 82n and is fixed to the front and rear cross beams 61l, 61k by welding or the like.

[0058] In this way, since the front wall and the rear wall of the support leg 35 are disposed directly above the hull structure 50 and the lower parts of the steel plates 82l, 82m, 82n in the hull structure 50 are reinforced by the reinforcing steel materials 81e, 81f, the support leg 35 is stably supported. Also, since the outer ends of the steel plates 82l, 82m extend to positions continuous with the ship - side outer plate 8a in the vertical direction, the support leg 35 is stably supported by the ship - side outer plate 8a.

[0059] [Operation and Effect] As described above, the ship 1 equipped with the anti - rolling device as an embodiment of the present invention includes an anti - rolling device 20 that suppresses the rocking of the hull 2 by the movement of the liquid W between the pair of left - and - right tank parts 21L, 21R. The pair of left - and - right tank parts 21L, 21R are located in the stern part 2B behind the bridge 6 and are supported at positions above the poop deck 4P which is an exposed deck in the stern part 2B. According to this, the tank part can be provided without interfering with the fittings on the poop deck 4P. The tank parts 21L, 21R can be provided above the poop deck 4P having a high anti - rolling effect without significantly affecting the view from the bridge 6.

[0060] In addition, the stern part 2B of the hull 2 is formed in a substantially tapered shape in plan view that gradually narrows toward the rear, and the pair of left and right tank parts 21L and 21R project outward beyond the outer plate 8b at the rearmost end of the stern part 2B. According to this, since the pair of left and right tank parts 21L and 21R can be arranged using the space outside the left and right side plates 8a of the narrow stern part 2B, the anti-rolling effect can be further enhanced.

[0061] In addition, the pair of left and right tank parts 21L and 21R are supported by a plurality of support legs 32 to 35 erected on the poop deck 4P, so that the space below the tank parts 21L and 21R can be effectively used as a work area on the poop deck 4P and a layout space for fitting equipment.

[0062] In addition, the left and right width dimension L11 of the pair of left and right tank parts 21L and 21R is less than or equal to the maximum left and right width dimension L1 of the hull 2, so that the basic specifications of the hull 2 are not changed, and it is possible to prevent the tank parts 21L and 21R from getting in the way when docking, mooring line handling, etc. are performed.

[0063] In addition, the left and right width dimension L11 of the pair of left and right tank parts 21L and 21R is the same as the maximum left and right width dimension L1 of the hull 2, so that the basic specifications of the hull 2 are not changed, and the anti-rolling effect of the pair of left and right tank parts 21L and 21R can be maximized.

[0064] In addition, since the pair of left and right tank parts 21L and 21R are installed in the stern part 2B of the existing ship 1, the pair of left and right tank parts 21L and 21R can be retrofitted without interfering with fitting equipment such as the mooring machine 41 and bitts 42 already provided in the stern part 2B of the existing ship 1.

[0065] In addition, a ship 1 equipped with a roll damping device as an embodiment of the present invention is a ship 1 equipped with a roll damping device 20 that suppresses the rocking of the hull 2 by the movement of the liquid W between a pair of left and right tank portions 21L and 21R. It is erected on the poop deck 4P at the stern portion 2B of the existing hull 2, and a plurality of support legs 32 to 35 that support the pair of left and right tank portions 21L and 21R above the poop deck 4P, and reinforcing steel materials 81a to 81f as reinforcing members for reinforcing the hull structure 50 provided below the poop deck 4P. The plurality of support legs 32 to 35 are disposed above or in the vicinity of the upper side of the reinforcing steel materials 81a to 81f.

[0066] According to this, without using the bridge 6 or the like on the poop deck 4P, the heavy tank portions 21L and 21R can be stably supported at a portion with high strength on the poop deck 4P of the stern portion 2B. In addition, a pair of left and right tank portions 21L and 21R can be retrofitted to the stern portion 2B without impairing the installation space and work space for fittings and the like on the poop deck 4P.

[0067] In addition, the reinforcing steel materials 81a to 81f are provided by bridging the longitudinal beams 51a to 51f, the transverse beams 61a to 61o, and the ribs 71a to 71e and 72a to 72o as existing members constituting the poop deck 4P and the hull structure 50. According to this, the support legs 32 to 35 can be stably supported by utilizing the support strength of the existing members.

[0068] In addition, the stern portion 2B of the hull 2 is formed in a substantially tapered shape in plan view that gradually narrows toward the rear, and at least a part (for example, support legs 33 to 35) of the plurality of support legs 32 to 35 are arranged in a substantially inverted V shape in plan view along the left and right ship side outer plates 8a of the stern portion 2B. According to this, the support strength against the lateral load and torsion generated by the movement of the liquid W between the left and right is increased.

[0069] In addition, since at least some of the adjacent support legs 32 among the plurality of support legs 32 to 35 are connected by a truss structure, the support leg 32 is less likely to be deformed by the bending moment, and the support strength is increased.

[0070] Further, at least a part of the plurality of support legs 32 to 35 has a rectangular cross-sectional shape, making it difficult for the support legs 32 to 35 to deform and increasing the support strength.

[0071] As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and changes and additions within the scope not departing from the gist of the present invention are also included in the present invention.

[0072] For example, in the above embodiment, as an example of the exposed deck, a form in which the poop deck 4P provided at the stern part 2B is applied is illustrated. However, the present invention is not limited to this, and decks other than the poop deck 4P, such as the upper deck 4U, may be applied.

[0073] Also, in the above embodiment, a form in which the left and right width dimension L11 of the tank body 21 is substantially the same as the maximum left and right width dimension L1 of the hull 2 is illustrated. However, the present invention is not limited to this, and the left and right width dimension L11 of the tank body 21 may be shorter or longer than the maximum left and right width dimension L1 of the hull 2.

[0074] Also, in the above embodiment, a form in which the left and right tank parts 21L and 21R project outward beyond the left and right ship side outer plates 8a of the stern part 2B is illustrated. However, the present invention is not limited to this, and they do not necessarily have to project outward beyond the ship side outer plate 8a. That is, the left and right width dimension L11 of the tank body 21 having the left and right tank parts 21L and 21R may be substantially the same as or shorter than the left and right width dimension L2 at the rearmost end of the stern part 2B.

[0075] In addition, in the above embodiment, the tank body 21 having the left and right tank portions 21L and 21R is illustrated as being supported above the poop deck 4P by a plurality of support legs 32 to 35. However, the present invention is not limited thereto, and the structure, shape, arrangement position, number of arrangements, etc. of the support legs are arbitrary and can be variously changed. For example, although the plurality of support legs 33 to 35 were arranged in a substantially inverted V shape in plan view along the ship's side outer plate 8a of the stern portion 2B, regardless of whether the stern portion 2B is formed in a substantially tapered shape in plan view that gradually narrows rearward, they may be arranged in a substantially inverted V shape in plan view, or may not be arranged in a substantially inverted V shape in plan view.

[0076] In addition, although a plurality of support legs 33 to 35 excluding the support leg 32 were arranged in a substantially inverted V shape in plan view, all of the plurality of support legs 32 to 35 may be arranged in a substantially inverted V shape in plan view. Further, the support legs do not necessarily have to be erected on the exposed deck, and for example, they may protrude substantially horizontally from structures such as the side walls of the bridge 6 or the funnel 7. Further, they may be constituted by wall materials or the like.

[0077] In addition, in the above embodiment, a form in which some adjacent support legs 32 among the plurality of support legs 32 to 35 are connected by a truss structure is illustrated. However, the present invention is not limited thereto, and at least some of the support legs 33 to 35 other than the support leg 32 may be connected by a truss structure.

[0078] In addition, in the above embodiment, a form in which the tank body 21 having the left and right tank portions 21L and 21R is installed in the stern portion 2B of the existing ship 1 is illustrated. However, the present invention is not limited thereto, and the tank body 21 having the left and right tank portions 21L and 21R may be installed in the stern portion 2B of a newly built ship 1.

[0079] In addition, in the above embodiment, a form in which reinforcing steel materials 81a to 81f are applied as reinforcing members for reinforcing the hull structure 50 is illustrated. However, the present invention is not limited thereto, and the material, shape, size, arrangement position, etc. of the reinforcing members are arbitrary and are not limited to the above.

[0080] In the above embodiment, the reinforcing steel materials 81a to 81f as the reinforcing members for reinforcing the hull structure 50 are exemplified as being disposed directly below or in the vicinity of the lower part of the support legs 32 to 35. However, the present invention is not limited thereto, and it may be any position in the hull structure 50 where the moments of the support legs 32 to 35 act. For example, a reinforcing member may be provided in a region surrounded by the steel plates 82a to 82n constituting the support legs 32 to 35.

[0081] In the above embodiment, the support legs 32 to 35 are exemplified as being configured in a substantially rectangular tube shape or a U shape in plan view by a plurality of steel plates 82a to 82n. However, the present invention is not limited thereto, and the shape may be arbitrary, such as substantially H-shaped or circular in plan view. Also, it is not constituted by welding a plurality of such steel plates, and it may be constituted by a shaped steel or the like.

Explanation of Reference Numerals

[0082] 1 Ship 2 Hull 2B Stern 2F Bow 4N Navigation Bridge Deck 4P Poop Deck (Exposed Deck) 4U Upper Deck 6 Bridge 8 Side Shell 20 Anti-rolling Device 21 Tank Body 21C Connecting Passage Portion 21L, 21R Tank Portions (A Pair of Left and Right Tank Portions) 31 Base Portion 32 to 35 Support Legs 38 Connecting Frame 50 Hull Structure 51a to 51e Longitudinal Beams (Hull Structure, Existing Members) 61a to 61o Cross Beams (Hull Structure, Existing Members) 71a to 71e Ribs (Hull Structure, Existing Members) 72a to 72o Ribs (Hull Structure, Existing Members) 81a to 81f Reinforcing Steel Materials (Reinforcing Members) 82a to 82n Steel Plates Support plates 83a to 83d

Claims

1. A ship equipped with an anti-rolling device that suppresses the rolling of a hull by the movement of liquid between a pair of left and right tanks, A plurality of support legs are erected on the exposed deck of the hull and support the pair of left and right tank sections at a position above the exposed deck; A reinforcing member for reinforcing a hull structure provided below the exposure deck; Equipped with A ship equipped with an anti-rolling device, characterized in that the multiple support legs are arranged above or near the top of the reinforcing member.

2. 2. A ship equipped with a rocking reduction device according to claim 1, wherein the reinforcing member is provided to span the exposed deck and a member constituting the hull structure.

3. 2. A ship equipped with a rocking reduction device according to claim 1, wherein at least some of the plurality of support legs are connected to each other by a truss structure.

4. 2. A ship equipped with a rocking reduction device according to claim 1, wherein at least a portion of the plurality of support legs has a rectangular cross-sectional shape.

5. 2. A ship equipped with an anti-rolling device as described in claim 1, characterized in that the left and right width dimensions of the pair of left and right tank sections are equal to or smaller than the maximum left and right width dimensions of the hull.

6. 6. A ship equipped with an anti-rolling device as described in claim 5, characterized in that the left and right width dimensions of the pair of left and right tank sections are the same as the maximum left and right width dimension of the hull.

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