Ship

Abstract

A ship is provided with: a hull; a cylindrical tank which is mounted on the hull and has a cylindrical shape extending in the head-tail direction of the hull; a tank cover that covers the cylindrical tank on the hull from above and both sides of the hull in the width direction of the hull; and a floating prevention part provided so as to protrude from the top of the cylindrical tank, the upper surface of the floating prevention part being disposed at a distance from the inner surface of the tank lid.

Description

Technical Field

[0001] The present disclosure relates to vessels.

[0002] This application claims priority to Japanese Patent Application No. 2022-121427 filed in Japan on July 29, 2022, the contents of which are cited herein. Background Art

[0003] Patent Document 1 discloses a ship carrying a tank for liquefied gas. In the ship, brackets are fixed to both sides of the tank in the ship width direction, and a support platform for supporting the bracket from below is provided on the hull side. In addition, in order to restrict the vertical movement of the tank, the ship of Patent Document 1 is provided with an upper stopper on the support platform for restraining the bracket from above.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: (Japanese) Patent Publication No. 9-133297 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In a ship carrying a tank for liquefied gas, such as the ship described in Patent Document 1, a member for preventing the tank from floating is required according to ship classification rules. However, in a structure in which a bracket is provided outside the tank and the bracket is restrained from above by an upper stopper, as in Patent Document 1, a large space is required between the tank and the hull structure such as the tank cover, resulting in a large dead space.

[0009] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a ship capable of reducing dead space.

[0010] Technical solutions for solving technical problems

[0011] In order to solve the above-mentioned problems, the ship disclosed in the present invention comprises: a hull; a cylindrical tank, which is carried on the hull and has a cylindrical shape extending in the bow and stern directions of the hull; a tank cover, which covers the cylindrical tank from above and on both sides of the hull in the ship width direction; and a flotation prevention portion, which is arranged in a manner protruding from the top of the cylindrical tank, and the upper surface is spaced apart from the inner surface of the tank cover.

[0012] Effects of the Invention

[0013] According to the ship of the present disclosure, dead space can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a plan view showing the overall structure of the ship according to the embodiment of the present disclosure.

[0015] Figure 2 This is a longitudinal cross-sectional view of the cylindrical tank according to the embodiment of the present disclosure, taken in the up-down direction perpendicular to the bow and stern direction of the ship.

[0016] Figure 3 It is a perspective view of a cylindrical tank according to an embodiment of the present disclosure.

[0017] Figure 4 This is a side view of the interior of the cargo loading section according to the embodiment of the present disclosure as viewed from the ship width direction.

[0018] Figure 5 It is a perspective view of a first lifting member according to an embodiment of the present invention.

[0019] Figure 6 It is a perspective view showing a mounting frame and a floating prevention portion according to an embodiment of the present disclosure.

[0020] Figure 7 The vertical cross-sectional view in the up-down direction perpendicular to the bow and stern direction shows the center portion in the ship width direction of the first saddle and the first buffer block according to the embodiment of the present disclosure.

[0021] Figure 8 This is a vertical cross-sectional view showing a first saddle according to an embodiment of the present disclosure, in the up-down direction perpendicular to the ship width direction.

[0022] Fig. 9 This is a side view of the guide according to the embodiment of the present disclosure as viewed from the ship width direction. DETAILED DESCRIPTION

[0023] (Ship)

[0024] Below, refer to Figures 1 to 9 A ship 1 according to an embodiment of the present disclosure will be described.

[0025] like Figure 1 , Figure 2 As shown, the ship 1 stores and transports liquefied gas such as liquefied natural gas. The ship 1 includes a hull 2, a cylindrical tank 10, a saddle 20, a guide 30, a jack 40, a heat insulator 50, a floating prevention portion 60, and a tank cover 70.

[0026] Hereinafter, the bow and stern direction Da of the ship 1 is referred to as "the bow and stern direction Da", and the ship width direction Dw of the ship 1 is referred to as "the ship width direction Dw". Both the bow and stern direction Da and the ship width direction Dw intersect the up-down direction substantially perpendicularly. The bow and stern direction Da and the ship width direction Dw are orthogonal to each other.

[0027] (Hull)

[0028] The hull 2 ​​has a pair of sidewalls 3, a bottom 4, and an upper deck 5. The pair of sidewalls 3, the bottom 4, and the upper deck 5 constitute the outer shell of the hull 2. The sidewalls 3 have a pair of sidewall outer plates that form the left and right sidewalls 3, respectively. The bottom 4 has a bottom outer plate that connects these sidewalls 3. Through the pair of sidewalls 3 and the bottom 4, the outer shell of the hull 2 ​​is U-shaped in a cross section that is orthogonal to the bow and stern direction Da. The upper deck 5 is a full-through deck exposed to the outside. An upper structure 6 having a living area is formed on the upper deck 5 on the stern 2b side of the hull 2.

[0029] A plurality of cargo loading sections 7 (cargo holds) are formed on the hull 2 ​​at a position closer to the bow 2a than the upper structure 6. The plurality of cargo loading sections 7 are arranged in a row in the bow and tail direction Da. The cargo loading sections 7 are recessed toward the bottom 4 below the upper deck 5 and open upward. A cylindrical tank 10 is stored in each of the plurality of cargo loading sections 7.

[0030] (Cylindrical can)

[0031] like Figures 2 to 4 As shown, the cylindrical tank 10 is a so-called cylindrical tank, and is arranged to extend in the bow and stern direction Da. The cylindrical tank 10 has a tank partition wall 11, a ring 12, a tank rib 13, a mounting flange 14, a lifting member 15, and a mounting frame 16.

[0032] (Tank partition)

[0033] The tank partition wall 11 includes a cylindrical portion 11a and an end plate portion 11b. The cylindrical portion 11a is formed in a cylindrical shape extending in the bow and stern direction Da. The end plate portion 11b is formed in a manner to block the openings on both sides of the cylindrical portion 11a in the bow and stern direction Da. The end plate portion 11b is formed in a dome shape extending outwardly from both sides of the cylindrical portion 11a in the bow and stern direction Da.

[0034] Hereinafter, the circumferential direction of the cylindrical portion 11 a will be simply referred to as the “circumferential direction”, and the radial direction of the cylindrical portion 11 a will be simply referred to as the “radial direction”.

[0035] (Ring and tank rib)

[0036] The ring 12 and the tank rib 13 function as reinforcements for increasing the strength of the tank bulkhead 11 against external forces. A plurality of rings 12 and tank ribs 13 are provided inside the tank bulkhead 11. The plurality of rings 12 and tank ribs 13 are provided at intervals in the bow and stern direction Da.

[0037] The tank rib 13 extends radially inward from the inner circumferential surface of the cylindrical portion 11a. The tank rib 13 is formed in a plate shape extending in the radial direction of the cylindrical portion 11a, and is formed in a circular ring shape that is continuous in the entire circumferential direction of the cylindrical portion 11a. The ring 12 is formed in a cylindrical shape extending from the inner circumferential edge of the tank rib 13 in the bow and stern direction Da. In a cross-sectional view including the center line of the tank partition 11, these rings 12 and the tank rib 13 are T-shaped.

[0038] The positions of the ring 12 and the tank rib 13 in the bow and stern direction Da are set to positions corresponding to the positions of the saddle 20 described later in the bow and stern direction Da. Here, the position corresponding to the saddle 20 means that by providing the ring 12 and the tank rib 13, the range in which the tank bulkhead 11 can be strengthened with respect to the reaction force of the saddle 20, for example, in addition to the case where the positions of the ring 12 and the tank rib 13 in the bow and stern direction Da are completely consistent with the position of the saddle 20 in the bow and stern direction Da, there is also a case where there is a slight deviation.

[0039] (Mounting flange)

[0040] like Figure 3 As shown, the mounting flange 14 is a member for positioning the cylindrical tank 10 in the bow and stern direction Da relative to the hull 2. The mounting flange 14 is provided at a position corresponding to one saddle 20 (a first saddle 20a described later) among a plurality of saddles 20 arranged at intervals in the bow and stern direction Da. The mounting flange 14 protrudes radially outward from the outer surface of the cylindrical portion 11a of the tank partition 11 and is formed in an arc shape extending in the circumferential direction of the cylindrical portion 11a along the tank rib 13.

[0041] (Lifting parts)

[0042] The lifting fixture 15 is a component used to lift the cylindrical tank 10 by a crane or the like when loading the cylindrical tank 10 onto the ship 2. In the present embodiment, two sets of lifting fixtures 15 are provided at intervals in the bow and stern direction Da, and are arranged back to back at the same position in the bow and stern direction Da. Figures 3 to 5 As shown, the lifting member 15 has a main body plate 17 and ribs 18 .

[0043] The main body plate 17 extends radially outward from the cylindrical portion 11a of the tank bulkhead 11. The main body plate 17 of the present embodiment is disposed at the same position as the center of the cylindrical portion 11a in the up-down direction, and is disposed on both outer sides of the cylindrical portion 11a in the ship width direction Dw. That is, the main body plate 17 is disposed in the middle portion in the up-down direction of the side portion of the tank bulkhead 11 in the ship width direction Dw. The main body plate 17 is configured in a plate shape extending in the circumferential direction (in other words, the up-down direction) and radial direction of the cylindrical portion 11a. The main body plate 17 is disposed at a position where the cylindrical portion 11a is reinforced in the bow and stern direction Da, that is, at a position where the tank rib 13 is formed in the bow and stern direction Da.

[0044] like Figure 5As shown in FIG. 1 , the position of the main body plate 17 of one of the two sets of lifting members 15 (hereinafter referred to as the "first lifting member 15a") disposed at intervals in the bow and stern direction Da is set to be the same as the position of the mounting flange 14 of the cylindrical portion 11a in the bow and stern direction Da. The two main body plates 17 of the first lifting member 15a are formed continuously and integrally with the mounting flange 14. The main body plate 17 of the first lifting member 15a has an outer peripheral portion extending radially outward from the mounting flange 14, and the lower edge of the outer peripheral portion extends in the ship width direction Dw.

[0045] In addition, an insertion hole 17a penetrating in the bow and stern direction Da is formed in the upper portion of the main body plate 17. A wire or the like for suspending the cylindrical tank 10 can be inserted through the insertion hole 17a.

[0046] The rib 18 is a reinforcing member for improving the strength of the main body plate 17. The rib 18 is provided on both sides or one side of the main body plate 17 in the bow and stern direction Da. The strength of the main body plate 17 in the thickness direction is improved by the rib 18. The rib 18 extends in the bow and stern direction Da and the ship width direction Dw, and is fixed to the main body plate 17 and the cylindrical portion 11a, respectively. The rib 18 of this embodiment crosses the main body plate 17 and the cylindrical portion 11a approximately perpendicularly, and forms a triangle when viewed from the top and bottom directions. In addition, the rib 18 of this embodiment is located below the insertion hole 17a.

[0047] like Figure 4 , Figure 6 As shown, the mounting frame 16 is provided for mounting and positioning the floating prevention portion 60. The mounting frame 16 is provided on the outer surface of the top 10a of the cylindrical tank 10, and is formed into a rectangular frame shape when viewed from above. In the present embodiment, two mounting frames 16 are separately provided in the bow and stern direction Da. The two mounting frames 16 are formed in positions corresponding to the saddle 20 described later in the bow and stern direction Da. That is, the two mounting frames 16 are formed in positions corresponding to the plurality of tank ribs 13 of the cylindrical tank 10 in the bow and stern direction Da. Here, the top 10a of the cylindrical tank 10 is the uppermost portion of the outer surface of the cylindrical tank 10, and in the present embodiment, it is the central position of the upper half of the cylindrical tank 10.

[0048] (Saddle)

[0049] like Figure 2 , Figure 4As shown, the saddle 20 is arranged in the cargo loading partition 7 of the hull 2, and supports the cylindrical tank 10 from below. A plurality of saddles 20 are provided at intervals in the bow and stern direction Da. In the present embodiment, two saddles 20 are used to support one cylindrical tank 10. Hereinafter, the saddle 20 located on one side of the bow and stern direction Da (for example, the bow 2a side) of the pair of saddles 20 is referred to as the "first saddle 20a", and the saddle 20 located on the other side of the bow and stern direction Da (for example, the stern 2b side) is referred to as the "second saddle 20b".

[0050] The first saddle 20 a and the second saddle 20 b respectively include a supporting wall portion 21 , a buffer block 22 , a positioning flange 23 , a parallel wall portion 24 , and a base portion 25 .

[0051] The support wall portion 21 extends in the circumferential direction along the outer surface of the lower half of the cylindrical portion 11a of the cylindrical tank 10. That is, the support wall portion 21 is formed in an arc shape that is recessed downward when viewed from the bow and stern direction Da. The support wall portion 21 has a support surface 26 formed on the radial inner side thereof so as to face the outer surface of the cylindrical portion 11a.

[0052] The buffer block 22 is arranged in a manner of being sandwiched between the supporting surface 26 and the cylindrical portion 11a, and functions as a buffer. In addition, the buffer block 22 also has the function of a heat insulating member. The buffer block 22 is formed in an arc shape extending in the circumferential direction along the outer surface of the tank partition wall 11 of the cylindrical tank 10 in the same manner as the supporting wall portion 21. The buffer block 22 abuts against the outer surface of the lower half of the cylindrical tank 10. The buffer block 22 can be formed, for example, of wood or the like. Hereinafter, the buffer block 22 provided on the first saddle 20a will be referred to as the "first buffer block 22a", and the buffer block 22 provided on the second saddle 20b will be referred to as the "second buffer block 22b".

[0053] like Figure 7 As shown, the buffer block 22 has a positioning protrusion 27 for positioning relative to the supporting wall portion 21 in the circumferential direction. The positioning protrusion 27 protrudes radially outward from the surface of the buffer block 22 facing the supporting wall portion 21. In contrast, a positioning recess 28 into which the positioning protrusion 27 can be inserted is formed in the supporting wall portion 21. In addition, the positioning protrusion 27 of the buffer block 22 is inserted into the positioning recess 28, so as to limit the displacement of the buffer block 22 relative to the supporting wall portion 21 in the circumferential direction.

[0054] like Figure 8As shown, a groove 22c extending in the circumferential direction is formed on the surface of the first buffer block 22a in the buffer block 22 that abuts against the cylindrical portion 11a. The mounting flange 14 of the cylindrical tank 10 is inserted into the groove 22c of the first buffer block 22a. By inserting the mounting flange 14 into the groove 22c of the first buffer block 22a, the displacement of the first buffer block 22a relative to the cylindrical portion 11a in the bow and stern direction Da is restricted. It should be noted that the second buffer block 22b does not have a groove 22c like the first buffer block 22a, and abuts against the outer surface of the cylindrical portion 11a in a manner that allows it to slide in the bow and stern direction Da (illustration omitted).

[0055] The positioning flange 23 limits the displacement of the buffer block 22 in the bow and stern direction Da relative to the supporting wall portion 21. The positioning flange 23 is formed along the two edges on both sides of the supporting wall portion 21 in the bow and stern direction Da, and extends radially inward from the supporting wall portion 21. The positioning flange 23 of the present embodiment respectively abuts the buffer block 22 on the two side surfaces in the bow and stern direction Da. In addition, the positioning flange 23 of the first saddle 20a is described, but the second saddle 20b is also provided with the positioning flange 23, and the displacement of the second buffer block 22b in the bow and stern direction Da relative to the supporting wall portion 21 of the second saddle 20b is limited (illustration omitted). In addition, the positioning flange 23 on the second saddle 20b side can also be provided on the cylindrical tank 10 side. In this case, the positioning flange 23 protrudes downward from the outer surface of the tank partition wall 11 of the cylindrical tank 10, and the second buffer block 22b can slide relative to the supporting surface 26.

[0056] like Figure 2 As shown, the parallel wall portion 24 is a place where the guide 30 and the jack 40 described later are placed, and extends from both ends of the support wall portion 21 in the ship width direction Dw (in other words, the upper end of the support wall portion 21) toward the outer side in the ship width direction Dw. That is, a pair of parallel wall portions 24 are provided separately in the ship width direction Dw. The parallel wall portion 24 of this embodiment has a plane extending in the bow and stern direction Da and the ship width direction Dw, and is connected to the hull 2 ​​on both outer sides in the ship width direction Dw.

[0057] The base 25 connects the above-mentioned supporting wall 21, parallel wall 24 and hull 2. More specifically, the base 25 extends from the wall surface of the hull 2 ​​that divides the cargo loading section 7 to support the supporting wall 21 and the parallel wall 24. It should be noted that in the present embodiment, the case where the base 25 is formed in a flat plate shape extending in a direction perpendicular to the bow and stern direction Da is shown as an example, but it is not limited to this shape.

[0058] (Guide and jack)

[0059] like Figure 2 , Fig. 9As shown, the guide 30 and the jack 40 are provided on the parallel wall portion 24 of the saddle 20. The guide 30 supports the suspending member 15 from below. The jack 40 is provided between the guide 30 and the parallel wall portion 24, and can adjust the vertical position of the guide 30.

[0060] The guide 30 is formed, for example, in a block shape extending in the up-down direction. The guide 30 has a slit 31 formed on its upper surface and opening upward. The slit 31 extends downward from the opening formed on the upper surface of the guide 30. The main body plate 17 of the suspending member 15 can be inserted into the slit 31 from above. More specifically, the outer peripheral portion of the main body plate 17 of the suspending member 15, which is one side away from the cylindrical tank 10, can be inserted into the slit 31. When the outer peripheral portion of the main body plate 17 is inserted into the slit 31, the lower edge of the outer peripheral portion of the main body plate 17 hits the bottom of the slit, and the main body plate 17 is supported from below by the guide 30. In addition, the slit 31 sandwiches the main body plate 17 of the suspending member 15 from both sides in the bow and stern direction Da. By inserting the main body plate 17 of the suspending member 15 into the guide 30 in this way, the installation position of the cylindrical tank 10 in the bow and stern direction Da is determined.

[0061] (Thermal insulation)

[0062] The heat insulating material 50 suppresses heat input from the outside to the cylindrical tank 10. The heat insulating material 50 covers the tank partition wall 11 of the cylindrical tank 10 from the outer peripheral side and has a predetermined thickness. As the heat insulating material 50, for example, polyurethane foam or the like can be used.

[0063] (Floating prevention part)

[0064] The floating prevention portion 60 prevents the cylindrical tank 10 from floating up by a predetermined amount or more due to the buoyancy of the cylindrical tank 10 when the cargo loading section 7 is flooded.

[0065] like Figure 2 , Figure 3 , Figure 6 As shown, the floating prevention part 60 is assembled to the cylindrical tank 10 in a manner protruding upward from the top 10a of the cylindrical tank 10. A plurality of floating prevention parts 60 (two in the present embodiment) are provided at intervals in the bow and stern direction Da. The floating prevention parts 60 are respectively embedded in the above-mentioned mounting frame 16, and the floating prevention parts 60 are mounted on the top 10a of the cylindrical tank 10. Thus, the floating prevention part 60 is provided in a manner protruding from the top 10a of the cylindrical tank 10, and the displacement of the floating prevention part 60 relative to the cylindrical tank 10 in the circumferential direction and in the bow and stern direction Da is limited.

[0066] The upper surface 63 of the floating prevention portion 60 is arranged at a distance from the inner surface 72 of the tank cover 70. More specifically, the upper surface 63 of the floating prevention portion 60 is arranged at a distance from the tank cover 70 in the up-down direction. In the present embodiment, the upper surface 63 of the floating prevention portion 60 is arranged at a distance from the lower surface of the frame 70b described later, which is a reinforcement of the tank cover 70, at a distance from the lower surface.

[0067] The floating prevention part 60 protrudes toward the outer peripheral side (in other words, upward) than the heat insulating member 50 provided on the outer side of the cylindrical tank 10. The floating prevention part 60 is a solid block, and can be formed of a resin material such as a phenolic resin, wood, etc. In the present embodiment, the case where the vertical dimension of the floating prevention part 60 is smaller than the dimension of the floating prevention part 60 in the bow and stern direction Da and the ship width direction Dw is shown, but the size of the upper surface 63 of the floating prevention part 60, the vertical dimension, etc. are determined by considering the surface pressure acting on the upper surface 63, the compressive strength of the material forming the floating prevention part 60, etc.

[0068] The upper surface 63 of the floating prevention part 60 is formed in a shape along the lower surface of the frame 70b of the tank cover 70. The upper surface 63 of the floating prevention part 60 illustrated in the present embodiment is formed in a plane shape extending in the bow and stern direction Da and the ship width direction Dw. In the present embodiment, as an example, the floating prevention part 60 is shown as a rectangular parallelepiped, but it is not limited to this shape.

[0069] (Can lid)

[0070] like Figure 2 As shown, the tank cover 70 is in a dome shape that blocks the opening of the cargo loading partition 7 from above and covers the upper half of the cylindrical tank 10 disposed above the upper deck 5. That is, the tank cover 70 covers the cylindrical tank 10 at least from above and from both sides of the ship width direction Dw of the hull 2. The center portion of the tank cover 70 in the ship width direction Dw (hereinafter referred to as the cover center portion 71) of the tank cover 70 of this embodiment extends along the bow and stern direction Da and the ship width direction Dw. The above-mentioned floating prevention portion 60 is disposed below the cover center portion 71.

[0071] The tank cover 70 can be formed of, for example, a metal material or the like. The tank cover 70 of the present embodiment comprises a cover body 70a formed in a plate shape and a skeleton 70b for reinforcing the cover body 70a. The skeleton 70b extends in the ship width direction Dw, and is formed to extend from the upper deck 5 on one side of the ship width direction Dw to the upper deck 5 on the other side of the ship width direction Dw. Moreover, a plurality of skeletons 70b extending in the above-mentioned ship width direction Dw are provided at intervals in the bow and stern direction Da. In addition, the skeleton 70b of the present embodiment is provided at least at the same position as the floating prevention portion 60 in the bow and stern direction Da. In other words, the skeleton 70b is arranged at least above the floating prevention portion 60.

[0072] (Effect)

[0073] According to the ship 1 of this embodiment, the following effects are achieved.

[0074] In this embodiment, the ship 1 includes a cylindrical tank 10, a tank cover 70, and a floating prevention portion 60. The cylindrical tank 10 is placed on the hull 2 ​​and is formed into a cylindrical shape extending in the bow and stern direction Da of the hull 2. The tank cover 70 covers the cylindrical tank 10 from above and on both sides of the ship width direction Dw of the hull 2 ​​on the hull 2. The floating prevention portion 60 is provided in a manner protruding from the top 10a of the cylindrical tank 10, and the upper surface 63 is spaced apart from the inner surface 72 of the tank cover 70.

[0075] Thus, for example, even if the hull 2 ​​is flooded and the cylindrical tank 10 is about to float, the floating prevention portion 60 will collide with the tank cover 70 before the tank partition wall 11 and the heat insulating member 50, thereby preventing the cylindrical tank 10 from floating further. Therefore, it is sufficient to provide a space between the top 10a of the cylindrical tank 10 and the tank cover 70 to the extent that the floating prevention portion 60 can be provided, so that, for example, compared with the case where stoppers for preventing floating are provided on both sides of the upper half of the cylindrical tank 10 in the ship width direction Dw, the distance between the tank cover 70 and the cylindrical tank 10 can be reduced. Therefore, the ineffective space between the cylindrical tank 10 and the tank cover 70 can be reduced.

[0076] Furthermore, if the tank cover 70 is miniaturized according to the reduction of the dead space, the weight of the hull 2 ​​can be reduced, and the propulsion performance of the ship 1 can be improved. Furthermore, by miniaturizing the tank cover 70, the manufacturing cost can be reduced, and the ship 1 can be miniaturized.

[0077] On the other hand, when the tank cover 70 is not miniaturized, the dead space is reduced, and a larger cylindrical tank 10 can be loaded. Therefore, more gas can be stored or transported without increasing the size of the ship 1.

[0078] In the present embodiment, a plurality of floating prevention portions 60 are provided at intervals in the bow and stern direction Da.

[0079] Thus, the ship 1 can prevent the cylindrical tank 10 from floating up without bias in the bow and stern direction Da. In other words, it is possible to prevent only one side of the cylindrical tank 10 from floating up in the bow and stern direction Da. Therefore, it is possible to suppress the posture of the cylindrical tank 10 from becoming unstable.

[0080] Furthermore, the ship 1 can disperse the reaction force from the tank cover 70 to the cylindrical tank 10 by using the plurality of floating prevention parts 60. Thus, the reaction force from the tank cover 70 to each floating prevention part 60 can be reduced. Therefore, the reliability of the floating prevention part 60 can be improved.

[0081] In the present embodiment, the ship 1 includes a saddle 20 provided on the hull 2 ​​and supporting the cylindrical tank 10 from below. The floating prevention portion 60 is provided at a position corresponding to the saddle 20 in the bow and stern direction Da.

[0082] Since the reaction force from the saddle 20 is directly transmitted to the portion of the cylindrical tank 10 corresponding to the saddle 20 in the bow and stern direction Da, a ring 12 and a tank rib 13 are formed inside the cylindrical tank 10, and the cylindrical tank 10 is reinforced compared with other portions of the cylindrical tank 10. In the present embodiment, the floating prevention portion 60 can be provided in the reinforced portion. Therefore, the ship 1 can share the reinforcement for the saddle 20 and the reinforcement for the floating prevention portion 60. Therefore, the structural complexity of the cylindrical tank 10 can be suppressed, and the floating prevention portion 60 can be reinforced.

[0083] In the present embodiment, the ship 1 includes a guide 30 for defining the installation position of the cylindrical tank 10 in the bow and stern direction Da. The cylindrical tank 10 includes a tank partition 11 and a hoisting fixture 15 provided in the middle portion in the vertical direction of the side portion of the tank partition 11 in the ship width direction Dw and used to hoist the cylindrical tank 10. The guide 30 includes a slit 31 that opens upward and into which the hoisting fixture 15 can be inserted, and the hoisting fixture 15 inserted in the guide 30 is sandwiched from both sides in the bow and stern direction Da.

[0084] When the cylindrical tank 10 is installed on the ship 2, the cylindrical tank 10 is lifted by the lifting member 15 and lowered into the cargo loading section 7. At this time, the cylindrical tank 10 can be positioned in the bow and stern direction Da by inserting the lifting member 15 into the slit 31 of the guide member 30. Thus, the installation accuracy of the cylindrical tank 10 in the bow and stern direction Da is improved.

[0085] In addition, since the lifting fixture 15 is arranged in the middle part of the vertical direction of the side part of the tank partition wall 11 in the ship width direction Dw, the ineffective space between the tank cover 70 and the cylindrical tank 10 can be reduced compared with the case where the lifting fixture 15 is arranged above the tank partition wall 11.

[0086] In the present embodiment, a jack 40 is provided which supports the guide 30 from below and can change the vertical position of the guide 30 .

[0087] According to the present embodiment, the vertical height of the cylindrical tank 10 can be adjusted by changing the vertical position of the guide 30 using the jack 40. Therefore, the vertical installation accuracy of the cylindrical tank 10 can be improved.

[0088] In this embodiment, the first buffer block 22a of the first saddle 20a and the second buffer block 22b of the second saddle 20b are sandwiched from both sides in the bow and stern direction Da by the positioning flange 23. In addition, the groove 22c is formed only in the first buffer block 22a, and the mounting flange 14 of the cylindrical tank 10 is inserted into the groove 22c.

[0089] Thus, the cylindrical tank 10 can be suppressed from moving in the bow and stern direction Da relative to the first saddle 20a. On the other hand, since the cylindrical tank 10 is allowed to move in the bow and stern direction Da relative to the second saddle 20b, even if the cylindrical tank 10 is deformed in the bow and stern direction Da due to thermal expansion and contraction, the thermal deformation of the cylindrical tank 10 can be released toward the second saddle 20b. Therefore, the generation of thermal stress applied to the cylindrical tank 10 can be suppressed.

[0090] In this embodiment, the support surface 26 of the saddle 20 is provided with a positioning recess 28. In addition, the buffer block 22 is provided with a positioning protrusion 27. And the positioning protrusion 27 is inserted into the positioning recess 28 of the saddle 20.

[0091] This can suppress displacement of the buffer block 22 in the circumferential direction of the cylindrical tank 10 . Therefore, the ship 1 can stably support the cylindrical tank 10 by the saddle 20 via the buffer block 22 .

[0092] In the present embodiment, the two first hanging members 15 a are integrally formed so as to be continuous with the mounting flange 14 .

[0093] This can improve the strength of the first suspending fixture 15a against the load in the bow and stern direction Da. In addition, since the first suspending fixture 15a and the mounting flange 14 can be formed integrally, the first suspending fixture 15a can be easily formed.

[0094] In the present embodiment, the floating prevention portion 60 is formed of a resin material or wood.

[0095] Thus, the floating prevention portion 60 is lighter than when the floating prevention portion 60 is formed of a metal material. Therefore, the entire ship 1 can be lighter. Furthermore, the generation of sparks when the floating prevention portion 60 contacts the tank cover 70 can be suppressed.

[0096] (Other Implementations)

[0097] As mentioned above, although the embodiment of this disclosure is described in detail with reference to drawings, the specific structure is not limited to this embodiment, and design changes etc. which do not deviate from the scope of the gist of this disclosure are also included.

[0098] In the above embodiment, the cylindrical tank 10 is described as storing liquefied natural gas, but the present invention is not limited thereto. The cylindrical tank 10 may store other liquefied gases such as liquefied petroleum gas or liquefied carbon dioxide.

[0099] In the above embodiment, each of the plurality of cargo loading sections 7 accommodates one cylindrical tank 10, but the present invention is not limited thereto. A plurality of cylindrical tanks 10 may be provided in each cargo loading section 7. In this case, for example, the above-mentioned saddle 20, guide 30, jack 40, heat insulating member 50, and floating prevention portion 60 are provided for each cylindrical tank 10.

[0100] In the above-described embodiment, the ship 1 includes the guide 30 and the jack 40 for defining the installation position of the cylindrical tank 10 , but the present invention is not limited thereto. The ship 1 may not include the guide 30 and the jack 40 .

[0101] In the above embodiment, the heat insulating material 50 covers the cylindrical tank 10 from the outer peripheral side, but the present invention is not limited thereto. The cylindrical tank 10 may be not covered by the heat insulating material 50 .

[0102] In the above embodiment, the case where the positioning recess 28 is provided at the center of the first saddle 20a in the ship width direction Dw, and the positioning protrusion 27 is provided at the center of the first buffer block 22a in the ship width direction Dw is described, but the present invention is not limited thereto. The first saddle 20a and the second saddle 20b may each be provided with the positioning recess 28, and the first buffer block 22a and the second buffer block 22b may each be provided with the positioning protrusion 27 in the ship width direction Dw.

[0103] In the above embodiment, two floating prevention parts 60 are provided in one cylindrical tank 10 along the bow and stern direction Da, but the present invention is not limited thereto. Three or more floating prevention parts 60 may be provided in one cylindrical tank 10 along the bow and stern direction Da, or only one floating prevention part 60 may be provided.

[0104] In the above embodiment, the floating prevention part 60 is provided at the same position as the saddle 20 in the bow and tail direction Da, but the present invention is not limited thereto. For example, the floating prevention part 60 may be provided at a position offset from the saddle 20 in the bow and tail direction Da.

[0105] In the above-mentioned embodiment, the floating prevention portion 60 is formed in a rectangular parallelepiped shape, but the present invention is not limited thereto and the floating prevention portion 60 may be formed in a disk shape or the like, for example.

[0106] In the above embodiment, the floating prevention portion 60 is a solid block, but the present invention is not limited thereto. The floating prevention portion 60 may be, for example, a hollow block.

[0107] In the above embodiment, the vertical dimension of the floating prevention portion 60 is smaller than the dimensions of the floating prevention portion 60 in the bow and stern direction Da and the ship width direction Dw, but the present invention is not limited thereto. The vertical dimension of the floating prevention portion 60 may also be larger than the dimensions of the floating prevention portion 60 in the bow and stern direction Da and the ship width direction Dw.

[0108] In the above embodiment, the floating prevention part 60 is formed of resin materials such as phenolic resin or wood, but is not limited thereto. The floating prevention part 60 may be formed of the same material as the can cover 70, for example, a metal material such as copper.

[0109] In the above embodiment, the case where the ship 1 includes the guide 30 and the jack 40 is described, but the present invention is not limited thereto. The ship 1 may not include the guide 30 and the jack 40 .

[0110] <Notes>

[0111] The ship 1 described in each embodiment can be understood, for example, as follows.

[0112] (1) A ship 1 of the first embodiment comprises: a hull 2; a cylindrical tank 10, which is placed on the hull 2 ​​and has a cylindrical shape extending in the bow and stern direction Da of the hull 2; a tank cover 70, which covers the cylindrical tank 10 from above and on both sides in the ship width direction Dw of the hull 2; and a floating prevention portion 60, which is provided in a manner protruding from the top 10a of the cylindrical tank 10, and the upper surface 63 is spaced apart from the inner surface 72 of the tank cover 70.

[0113] Thus, even if the hull 2 ​​is flooded and the cylindrical tank 10 floats, the floating prevention portion 60 hits the tank cover 70 before the cylindrical tank 10, thereby preventing the cylindrical tank 10 from floating further. Therefore, it is sufficient to provide a space between the cylindrical tank 10 and the container cover 70 to the extent that the floating prevention portion 60 can be provided, and the ineffective space between the cylindrical tank 10 and the container cover 70 can be reduced.

[0114] (2) The ship 1 of the second embodiment is the ship 1 of the first embodiment, wherein a plurality of the floating prevention portions 60 are provided at intervals in the bow and stern direction Da.

[0115] Thus, the ship 1 can prevent the cylindrical tank 10 from floating up uniformly in the bow and stern direction Da. In addition, the ship 1 can disperse the reaction force from the tank cover 70 to the cylindrical tank 10 by using the plurality of floating prevention parts 60 .

[0116] (3) The ship 1 of the third embodiment may be, based on the ship 1 of the first or second embodiment, provided with a saddle 20 provided on the hull 2 ​​and supporting the cylindrical tank 10 from below, and the floating prevention portion 60 is provided at a position corresponding to the saddle 20 in the bow and stern direction Da of the ship.

[0117] The position of the cylindrical tank 10 corresponding to the saddle 20 in the bow and stern direction Da is reinforced compared to other parts (general parts) of the cylindrical tank 10, so the floating prevention part 60 can be provided in the reinforced part. Therefore, the ship 1 can share the reinforcement for the saddle 20 and the reinforcement for the floating prevention part 60.

[0118] (4) A fourth embodiment of the ship 1 may be a ship 1 according to any one of the first to third embodiments, and further include a guide member 30 for defining the installation position of the cylindrical tank 10 in the bow and stern direction Da, wherein the cylindrical tank 10 includes a tank partition wall 11 and a lifting member 15 provided at a middle portion in the vertical direction of the side portion of the tank partition wall 11 in the ship width direction Dw and used for lifting the cylindrical tank 10, wherein the guide member 30 includes a slit 31 which opens upward and into which the lifting member 15 can be inserted, and the lifting member 15 inserted into the guide member 30 is clamped from both sides in the bow and stern direction Da.

[0119] When installing the cylindrical tank 10 on the hull 2, the cylindrical tank 10 can be lifted using the lifting fixture 15 and lowered on the hull 2. In addition, according to this embodiment, by inserting the lifting fixture 15 into the slit 31, the installation accuracy of the cylindrical tank 10 in the bow and stern direction Da can be improved.

[0120] (5) The ship 1 of the fifth aspect is the ship 1 of the fourth aspect, and may further include a jack 40 that supports the guide 30 from below and can change the vertical position of the guide.

[0121] According to this embodiment, the vertical height of the cylindrical tank 10 can be adjusted by changing the vertical position of the guide 30 using the jack 40. Therefore, the vertical installation accuracy of the cylindrical tank 10 can be improved.

[0122] Industrial Applicability

[0123] According to the ship of the present disclosure, dead space can be reduced.

[0124] Description of Reference Numerals

[0125] 1…Ship

[0126] 2…Hull

[0127] 2a…Bow

[0128] 2b…Stern

[0129] 3…Side of the ship

[0130] 4…bottom

[0131] 5…upper deck

[0132] 6…Superstructure

[0133] 7…Cargo loading area

[0134] 10…Cylindrical jar

[0135] 10a…top

[0136] 11…Tank partition

[0137] 11a…Cylinder

[0138] 11b…End plate

[0139] 12…Ring

[0140] 13…Tank Ribs

[0141] 14…Mounting flange

[0142] 15…Lifting parts

[0143] 15a…First lifting piece

[0144] 16…Mounting frame

[0145] 17…Main board

[0146] 17a…Through hole

[0147] 18…ribs

[0148] 20…Saddle

[0149] 20a…First Saddle

[0150] 20b…Second saddle

[0151] 21…Supporting wall

[0152] 22…Buffer block

[0153] 22a…first buffer block

[0154] 22b…Second buffer block

[0155] 22c…slot

[0156] 23…Locking flange

[0157] 24...Parallel wall part

[0158] 25…base

[0159] 26…Bearing surface

[0160] 27…Positioning convex part

[0161] 28…Location recess

[0162] 30...Guide

[0163] 31…Slit

[0164] 40…Jack

[0165] 50…Insulation

[0166] 60…Floating prevention part

[0167] 63…Upper surface

[0168] 70…jar lid

[0169] 70a…cover body

[0170] 70b...Skeleton

[0171] 70b...cover the center

[0172] 72…Inner surface

[0173] Da…the bow and stern direction of the ship

[0174] Dw…Ship width

Claims

1. A vessel, wherein: have: hull; a cylindrical tank, which is placed on the hull and has a cylindrical shape extending in the bow and stern directions of the hull; A tank cover, which covers the cylindrical tank from above and from both sides of the ship width direction on the ship hull; The floating prevention portion is provided so as to protrude from the top of the cylindrical can, and the upper surface is arranged at a distance from the inner surface of the can cover.

2. The vessel according to claim 1, wherein: The floating prevention portion is provided in plurality at intervals in the bow and stern direction of the ship.

3. A vessel according to claim 1 or 2, wherein: A saddle is provided on the hull and supports the cylindrical tank from below. The floating prevention portion is provided at a position corresponding to the saddle in the bow and stern direction of the ship.

4. The vessel according to claim 1 or 2, wherein: A guide is provided, which defines the installation position of the cylindrical tank in the bow and stern direction of the ship, The cylindrical tank has: Tank partitions; A lifting member provided at a middle portion in the vertical direction of the side portion of the tank partition wall in the ship width direction and used for lifting the cylindrical tank; The guide has a slit that opens upward and into which the hoisting tool can be inserted, and the hoisting tool inserted into the guide is sandwiched from both sides in the bow and stern directions of the ship.

5. The vessel according to claim 4, wherein: A jack is provided, the jack supporting the guide from below and being capable of changing the vertical position of the guide.

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