Hull Structure and Ship

Abstract

To provide a hull structure and a ship capable of reducing the number of hull structure members while suppressing an increase in weight.SOLUTION: A hull structure 2 comprises: multiple center tanks 21 arranged along a hull center line CL; and multiple wing tanks 22 arranged on both sides of the center tanks 21. Concerning the center tanks 21 and the wing tanks 22, transverse bulkheads 21a that partition the center tanks 21 in a ship longitudinal direction X and transverse bulkheads 22a that partition the wing tanks 22 in the ship longitudinal direction X are disposed at different positions in the ship longitudinal direction X, excluding both end parts in the ship longitudinal direction X of the hull structure 2. The transverse bulkheads 21a of the center tanks 21 are disposed deviated in the ship longitudinal direction X with respect to the transverse bulkheads 22a of the wing tanks 22.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a hull structure and a ship, and more particularly to a hull structure and a ship capable of reducing hull structure members.

Background Art

[0002] In recent years, price competition in ships has intensified, and the development of ships with strong price competitiveness is desired. For example, in Patent Document 1, a longitudinal partition wall (20) arranged in the longitudinal direction of the hull to divide the inside of the tank, and a plurality of vertical webs (22) that are coupled to the longitudinal partition wall (20) in the height direction of the hull and have a width of 0.15 times to 0.20 times the total height (H) of the tank, and a horizontal girder (24) arranged along the longitudinal direction of the hull are provided. A second reinforcing portion (24a) is integrally provided at an end of the horizontal girder (24), the width of the second reinforcing portion (24a) gradually increases, a free end is shaped into a round portion, and the second reinforcing portion (24a) is coupled to the vertical web (22). A tank structure of a very large oil tanker is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The invention described in Patent Document 1 aims to improve the structural strength of the tank and reduce the cross ties arranged between the longitudinal partition walls (20). However, in the invention described in Patent Document 1, since the horizontal girders are arranged so as to span in the longitudinal direction of the hull, there is a problem that the weight tends to increase.

[0005] The present invention was conceived in view of such problems, and an object thereof is to provide a hull structure and a ship capable of reducing the number of hull structure members while suppressing an increase in weight.

Means for Solving the Problems

[0006] According to the present invention, in a hull structure including a plurality of tanks partitioned in the ship length direction and the ship width direction, the plurality of tanks include: A cargo tank for accommodating goods to be transported, a plurality of center tanks arranged along the center line of the hull, and a plurality of wing tanks arranged on both sides of the center tanks, and the center tank and the wing tank adjacent to each other in the ship width direction include a configuration in which a transverse bulkhead partitioning the center tank in the ship length direction and a transverse bulkhead partitioning the wing tank in the ship length direction are arranged at different positions in the ship length direction, and the transverse bulkhead of the center tank includes a configuration in which it is arranged offset in the ship length direction with respect to the transverse bulkhead of the wing tank. The wing tank at a position corresponding to the transverse bulkhead of the center tank includes a single space partitioned by a longitudinal partition wall partitioning the center tank and the wing tank in the ship width direction, a side portion of the hull structure, a bottom portion of the hull structure, and an upper deck of the hull structure. The center tank at a position corresponding to the transverse bulkhead of the wing tank includes a single space partitioned by a longitudinal partition wall partitioning the center tank and the wing tank in the ship width direction, a bottom portion of the hull structure, and an upper deck of the hull structure. The side portion of the hull structure and the bottom portion of the hull structure are constituted by double bulkheads. A hull structure characterized by the above is provided.

[0007] The transverse bulkheads constituting both ends of the hull structure may be arranged at the same position in the ship length direction.

[0008] The plurality of tanks may include a transverse web or a swash bulkhead that can contribute to reducing sloshing.

[0009] The plurality of tanks may include strength reinforcing members arranged in the ship width direction.

[0010] The plurality of tanks may have tank lengths of substantially the same length.

[0011] Further, according to the present invention, a ship characterized by including any of the above-described hull structures is provided.

Effects of the Invention

[0012] According to the hull structure and the ship according to the present invention described above, by arranging the transverse bulkheads between the tanks adjacent to each other in the ship width direction at different positions in the ship length direction, it is possible to disperse the highly strong transverse bulkheads, improve the strength of the hull structure, and reduce the number of cross ties which are strength reinforcing members. Therefore, according to the present invention, it is possible to reduce the hull structure members while suppressing an increase in weight.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

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Figure 9

Figure 10

Figure 11

[0014] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 to 11(B). Fig. 1 is a side view showing a ship according to one embodiment of the present invention. Fig. 2 is a plan view showing a hull structure according to a first embodiment of the present invention. Fig. 3 is a cross-sectional view of the hull structure shown in Fig. 2, where (A) is a cross-sectional view taken along line A, (B) is a cross-sectional view taken along line B, and (C) is a cross-sectional view taken along line C. For ease of explanation, only half of the ship's width is shown in Figs. 3(A) to 3(C).

[0015] 1, a ship 1 according to an embodiment of the present invention comprises a hull structure 2 disposed in the center of the hull, a bow section 3 disposed forward of the hull structure 2, and a stern section 4 disposed aft of the hull structure 2. The bow section 3 may be provided with, for example, a bulbous bow 31 for reducing wave-making resistance. The stern section 4 comprises, for example, a propulsion device (propeller 41), a rudder 42, accommodation space 43, etc.

[0016] The ship 1 is a cargo ship that transports solids or liquids, and most of the ship except for a bow section 3 and a stern section 4 is composed of a hull structure 2. The ship 1 is, for example, a tanker, but is not limited to a tanker.

[0017] The hull structure 2 includes, for example, as shown in FIG. 2, a plurality of center tanks 21 arranged along the hull center line CL, and a plurality of wing tanks 22 arranged on both sides of the center tank 21. The center tank 21 and the wing tank 22 are partitioned in the ship width direction Y by longitudinal bulkheads 23 arranged along the ship length direction X.

[0018] That is, the hull structure 2 includes a plurality of tanks partitioned in the ship length direction X and the ship width direction Y. In the present embodiment, adjacent tanks in the ship width direction Y mean the center tank 21 and the wing tank 22. Further, the side surface portion 24 and the bottom surface portion 25 of the hull structure 2 may be constituted by double bulkheads constituting the hull. Also, the ceiling portion 26 of the hull structure 2 may be constituted by a deck constituting the hull.

[0019] The center tank 21 and the wing tank 22, except for both ends in the ship length direction X of the hull structure 2, have a transverse bulkhead 21a partitioning the center tank 21 in the ship length direction X and a transverse bulkhead 22a partitioning the wing tank 22 in the ship length direction X arranged at different positions in the ship length direction X. In FIG. 2, the dashed-dotted line shown in an X shape indicates the partitioned area.

[0020] Here, if the tank length (length in the ship length direction X) of the center tank 21 is Lc and the tank length (length in the ship length direction X) of the wing tank 22 is Lw, in most tanks, the tank length Lc and the tank length Lw have substantially the same length. "Most" means that in a part such as both ends or the middle part of the hull structure 2, the tank length Lc and the tank length Lw may have different lengths. Also, "substantially the same length" means including a difference of the order of manufacturing error.

[0021] As shown in FIG. 2, by arranging the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 shifted in the ship length direction X, the center tank 21 and the wing tank 22 can be arranged alternately or staggeredly, and the strength of the hull structure 2 can be improved.

[0022] Note that the transverse bulkheads (for example, the bow bulkhead or the front bulkhead of the engine room) arranged at both ends in the ship length direction X are bulkheads that constitute the overall shape of the hull structure 2, and thus may be arranged at the same position in the ship length direction X. Of course, the transverse bulkheads arranged at both ends in the ship length direction X may be arranged at different positions in the ship length direction X.

[0023] A horizontal girder 21b having a horizontal plane may be arranged on the transverse bulkhead 21a of the center tank 21. Further, a transverse web 21c for maintaining the structural strength may be arranged on the wall surface of the longitudinal through bulkhead 23 that constitutes the center tank 21. The transverse web 21c is constituted by, for example, a plate material having a vertical plane (YZ plane). By arranging such a transverse web 21c, sloshing can be reduced.

[0024] A horizontal girder 22b having a horizontal plane may be arranged on the transverse bulkhead 22a of the wing tank 22. By arranging such a horizontal girder 22b, the structural strength can be maintained. Further, a wash bulkhead 22c for reducing sloshing may be arranged between the transverse bulkheads 22a that constitute the wing tank 22. The wash bulkhead 22c is a non-watertight bulkhead and is constituted by a plate material that partially divides the wing tank 22 in the ship length direction X.

[0025] As shown in FIG. 3(A), the wing tank 22 at the position corresponding to the transverse bulkhead 21a of the center tank 21 has a space partitioned by a longitudinal through bulkhead 23, side surfaces 24, a bottom surface 25, and a ceiling surface 26. Note that a deck trans 22d may be arranged above the wing tank 22.

[0026] As shown in FIG. 3(B), the center tank 21 at the position corresponding to the transverse bulkhead 22a of the wing tank 22 has a space partitioned by a longitudinal partition wall 23, a bottom surface portion 25, and a ceiling portion 26. An annular or C-shaped transfer ring 21d may be disposed inside the center tank 21.

[0027] As shown in FIG. 3(C), the swash bulkhead 22c is composed of, for example, a plate material connected to the longitudinal partition wall 23, a side surface portion 24, and the bottom surface portion 25, and is configured to form a space between the ceiling portion 26. A horizontal girder 22e may be disposed on the swash bulkhead 22c. A deck transformer 22d may be disposed above the wing tank 22, or an annular or C-shaped transfer ring 21d may be disposed inside the center tank 21.

[0028] Next, the tank arrangement configuration of the hull structure 2 according to the first embodiment will be described with reference to FIGS. 4(A) to 5(D). Here, FIG. 4 is a partially enlarged view of the hull structure, where (A) is the first embodiment, (B) is the first modification of the first embodiment, (C) is the second modification of the first embodiment, and (D) is the third modification of the first embodiment. FIG. 5 is a partially enlarged view of the hull structure, where (A) is the fourth modification of the first embodiment, (B) is the fifth modification of the first embodiment, (C) is the sixth modification of the first embodiment, and (D) is the seventh modification of the first embodiment. In each figure, for convenience of explanation, the swash bulkhead is shown by a dotted line, the strength reinforcing member is shown by a one-dot chain line, and the horizontal girder is shown by being filled with gray.

[0029] As shown in FIG. 4(A), if the tank length Lw (the interval between the transverse bulkheads 22a) of the wing tank 22 is divided into ten equal parts, the hull structure 2 according to the first embodiment is configured such that, for example, the displacement amount D between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 is 0.3 times the tank length Lw. That is, in the first embodiment, D = 0.3Lw is set.

[0030] Further, the swash bulkhead 22c of the wing tank 22 is disposed at a position of 0.5Lw with respect to the transverse bulkhead 22a. Also, the horizontal girders 21b, 22b, 22e are disposed, for example, on the same side (the right side in the figure) with respect to each bulkhead. Note that the horizontal girder 22e of the swash bulkhead 22c is disposed, for example, on the side having a longer distance from the transverse bulkhead 22a or the horizontal girder 22b adjacent in the ship length direction X.

[0031] After determining the positions of the transverse bulkheads 21a, 22a and the swash bulkhead 22c, if necessary, the strength reinforcing members 27 disposed in the ship width direction Y may be arranged. Here, the strength reinforcing member 27 is arranged at a position corresponding to approximately the middle between the transverse bulkhead 22a and the swash bulkhead 22c in the center tank 21. The strength reinforcing member 27 is, for example, a cross tie.

[0032] According to the hull structure 2 according to the present embodiment, by arranging the transverse bulkheads 21a, 22a of the tanks adjacent in the ship width direction Y at different positions in the ship length direction X, the highly rigid transverse bulkheads 21a, 22a can be dispersed, the strength of the hull structure 2 can be improved, and the number of the strength reinforcing members 27 (cross ties) can be reduced to the minimum necessary.

[0033] As in the first modification of the first embodiment shown in FIG. 4(B), the strength reinforcing member 27 may be disposed in the wing tank 22. The strength reinforcing member 27 is disposed, for example, at approximately the middle between the transverse bulkhead 22a and the swash bulkhead 22c.

[0034] As in the second modification of the first embodiment shown in FIG. 4(C), the strength reinforcing member 27 disposed in the wing tank 22 may be replaced with the swash bulkhead 22c. At this time, the horizontal girder 22e of the swash bulkhead 22c may be disposed on the side opposite to the other horizontal girders 21b, 22b (the left side in the figure).

[0035] As in the third modification of the first embodiment shown in FIG. 4(D), the two wash bulkheads 22c shown in FIG. 4(C) may be integrated into one within each wing tank 22. At this time, depending on conditions such as the type and thickness of the steel materials constituting the hull structure 2 and the required strength, the strength reinforcing member 27 can be omitted.

[0036] As in the fourth modification of the first embodiment shown in FIG. 5(A), a wash bulkhead 21e may be arranged in the center tank 21, and a transverse web 22f may be arranged in the wing tank 22. The wash bulkhead 21e is arranged, for example, at a position corresponding to approximately the middle between the transverse bulkhead 21a and the transverse bulkhead 22a. The wash bulkhead 21e may be provided with a horizontal girder 21f. The transverse web 22f is arranged, for example, on the longitudinal partition wall 23. Also, within the wing tank 22, a strength reinforcing member 27 may be arranged between the transverse bulkheads 22a.

[0037] As in the fifth modification of the first embodiment shown in FIG. 5(B), the strength reinforcing member 27 may be arranged within the center tank 21. The strength reinforcing member 27 is arranged, for example, at approximately the middle between the transverse bulkhead 21a and the wash bulkhead 21e. Other configurations are the same as those shown in FIG. 5(A).

[0038] As in the sixth modification of the first embodiment shown in FIG. 5(C), the strength reinforcing member 27 shown in FIG. 5(B) may be replaced with a wash bulkhead 21e. At this time, the horizontal girder 21f of the wash bulkhead 21e may be arranged on the side opposite to the other horizontal girders 21b, 22b (the left side in the figure).

[0039] As in the seventh modification of the first embodiment shown in FIG. 5(D), the two wash bulkheads 21e shown in FIG. 5(C) may be integrated into one within the center tank 21. At this time, depending on conditions such as the type and thickness of the steel materials constituting the hull structure 2 and the required strength, the strength reinforcing member 27 can be omitted.

[0040] Next, the tank arrangement configuration of the hull structure 2 according to the second embodiment will be described with reference to FIGS. 6(A) to 8(D). Here, FIG. 6 is a partially enlarged view of the hull structure, where (A) is the second embodiment, (B) is the first modification of the second embodiment, (C) is the second modification of the second embodiment, and (D) is the third modification of the second embodiment. FIG. 7 is a partially enlarged view of the hull structure, where (A) is the fourth modification of the second embodiment, (B) is the fifth modification of the second embodiment, (C) is the sixth modification of the second embodiment, and (D) is the seventh modification of the second embodiment. FIG. 8 is a partially enlarged view of the hull structure, where (A) is the eighth modification of the second embodiment, (B) is the ninth modification of the second embodiment, (C) is the tenth modification of the second embodiment, and (D) is the eleventh modification of the second embodiment.

[0041] As shown in FIG. 6(A), the hull structure 2 according to the second embodiment is different from the first embodiment in the positional relationship between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22.

[0042] If the tank length Lc of the center tank 21 (the interval between the transverse bulkheads 21a) is divided into ten equal parts, the hull structure 2 according to the second embodiment is configured such that, for example, the displacement amount D between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 is 0.5 times the tank length Lc. That is, in the second embodiment, D = 0.5Lc is set.

[0043] The hull structure 2 according to the second embodiment includes a transverse web 21c in the center tank 21 and a wash bulkhead 22c in the wing tank 22. The wash bulkhead 22c is arranged at a position corresponding to the transverse bulkhead 21a (a position 0.5Lc from the transverse bulkhead 22a). Also, the horizontal girders 21b, 22b, 22e are arranged, for example, on the same side (the right side in the figure) with respect to each bulkhead.

[0044] After determining the positions of the transverse bulkheads 21a, 22a and the wash bulkhead 22c, the strength reinforcing members 27 may be arranged as necessary. Here, two strength reinforcing members 27 are arranged at positions corresponding to approximately the middle between the transverse bulkhead 22a and the wash bulkhead 22c in the center tank 21.

[0045] As in the first modification of the second embodiment shown in FIG. 6(B), the strength reinforcing members 27 may be arranged in the wing tank 22. The strength reinforcing members 27 are arranged, for example, approximately in the middle between the transverse bulkhead 22a and the wash bulkhead 22c. Although not shown, only one of the two strength reinforcing members 27 shown in FIG. 6(A) may be arranged in the wing tank 22.

[0046] As in the second modification of the second embodiment shown in FIG. 6(C), one of the two strength reinforcing members 27 arranged in the center tank 21 may be replaced with the wash bulkhead 22c arranged in the wing tank 22. At this time, the horizontal girder 22e of the wash bulkhead 22c may be arranged on the side opposite to the other horizontal girders 21b, 22b (the left side in the figure).

[0047] As in the third modification of the second embodiment shown in FIG. 6(D), the strength reinforcing member 27 shown in FIG. 6(C) may be arranged in the wing tank 22.

[0048] As in the fourth modification of the second embodiment shown in FIG. 7(A), the strength reinforcing member 27 shown in FIG. 6(D) may be replaced with the wash bulkhead 22c.

[0049] As in the fifth modification of the second embodiment shown in FIG. 7(B), the strength reinforcing member 27 shown in FIG. 6(A) can be omitted depending on conditions such as the type and thickness of the steel material constituting the hull structure 2 and the required strength.

[0050] As in the sixth modification of the second embodiment shown in FIG. 7(C), a wash bulkhead 21e may be disposed in the center tank 21, and a transverse web 22f may be disposed in the wing tank 22. The wash bulkhead 21e is disposed, for example, at a position corresponding to the transverse bulkhead 22a (a position 0.5Lc with respect to the transverse bulkhead 21a). Further, a strength reinforcing member 27 may be disposed in the center tank 21 between the transverse bulkhead 21a and the wash bulkhead 21e.

[0051] As in the seventh modification of the second embodiment shown in FIG. 7(D), the strength reinforcing member 27 shown in FIG. 7(C) may be disposed in the wing tank 22. Although not shown, only one of the two strength reinforcing members 27 shown in FIG. 7(C) may be disposed in the wing tank 22.

[0052] As in the eighth modification of the second embodiment shown in FIG. 8(A), the position of the wash bulkhead 21e shown in FIG. 7(C) may be changed, and the strength reinforcing member 27 may be changed to one. The wash bulkhead 21e is disposed, for example, between the transverse bulkhead 21a and the transverse bulkhead 22a. At this time, the horizontal girder 21f of the wash bulkhead 21e may be disposed on the opposite side (the left side in the figure) to the other horizontal girders 21b, 22b.

[0053] As in the ninth modification of the second embodiment shown in FIG. 8(B), the strength reinforcing member 27 shown in FIG. 8(A) may be disposed in the wing tank 22.

[0054] As in the tenth modification of the second embodiment shown in FIG. 8(C), the strength reinforcing member 27 shown in FIG. 8(A) may be replaced with the wash bulkhead 21e.

[0055] As in the eleventh modification of the second embodiment shown in FIG. 8(D), the two wash bulkheads 21e shown in FIG. 8(C) may be integrated into one in the center tank 21. At this time, depending on conditions such as the type and thickness of the steel materials constituting the hull structure 2 and the required strength, the strength reinforcement member 27 can be omitted.

[0056] Next, the tank arrangement configuration of the hull structure 2 according to the third embodiment will be described with reference to FIGS. 9(A) to 10(C). Here, FIG. 9 is a partially enlarged view of the hull structure, where (A) is the third embodiment, (B) is the first modification of the third embodiment, and (C) is the second modification of the third embodiment. FIG. 10 is a partially enlarged view of the hull structure, where (A) is the third modification of the third embodiment, (B) is the fourth modification of the third embodiment, and (C) is the fifth modification of the third embodiment.

[0057] As shown in FIG. 9(A), the hull structure 2 according to the third embodiment has changed the positional relationship between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 from the first embodiment.

[0058] If the tank length Lw of the wing tank 22 (the interval between the transverse bulkheads 22a) is divided into ten equal parts, the hull structure 2 according to the third embodiment is configured such that, for example, the deviation amount D between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the upper wing tank 22 in the figure is 0.3 times the tank length Lw (D = 0.3Lw).

[0059] Also, the hull structure 2 according to the third embodiment is configured such that, for example, the deviation amount D between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the lower wing tank 22 in the figure is 0.2 times the tank length Lw (D = 0.2Lw).

[0060] Thus, in the two rows of wing tanks 22 adjacent to the center tank 21, the transverse bulkheads 22a may be arranged at different positions in the ship length direction X. That is, the numerical values of the displacement amount D of the transverse bulkheads 22a of the wing tanks 22 adjacent to the center tank 21 may be different.

[0061] The hull structure 2 according to the third embodiment includes a transverse web 21c in the center tank 21 and a wash bulkhead 22c in the wing tank 22. The wash bulkhead 22c is arranged at a position approximately in the middle of the transverse bulkhead 22a (at a position of 0.5Lw with respect to the transverse bulkhead 22a). Further, the horizontal girders 21b, 22b, 22e are arranged, for example, on the same side (the right side in the figure) with respect to each bulkhead.

[0062] After determining the positions of the transverse bulkheads 21a, 22a and the wash bulkhead 22c, the strength reinforcing member 27 may be arranged as necessary. Here, the strength reinforcing member 27 is arranged at a position corresponding to approximately the middle between the transverse bulkhead 22a and the wash bulkhead 22c in the center tank 21.

[0063] As in the first modification of the third embodiment shown in Fig. 9(B), the strength reinforcing member 27 may be arranged in the wing tank 22. The strength reinforcing member 27 is arranged, for example, at approximately the middle between the transverse bulkhead 22a and the wash bulkhead 22c.

[0064] As in the second modification of the third embodiment shown in Fig. 9(C), the strength reinforcing member 27 arranged in the wing tank 22 may be replaced with the wash bulkhead 22c. At this time, the horizontal girder 22e of the wash bulkhead 22c may be arranged on the side opposite to the other horizontal girders 21b, 22b (the left side in the figure).

[0065] As in the third modification of the third embodiment shown in Fig. 10(A), a wash bulkhead 21e may be arranged in the center tank 21, and a transverse web 22f may be arranged in the wing tank 22. The wash bulkhead 21e is arranged, for example, at a position approximately in the middle of the upper and lower transverse bulkheads 22a and on the side away from the transverse bulkhead 21a (at a position 0.4Lw with respect to the transverse bulkhead 21a). Further, a strength reinforcing member 27 may be arranged between the transverse bulkhead 21a and the wash bulkhead 21e in the center tank 21.

[0066] As in the fourth modification of the third embodiment shown in Fig. 10(B), the strength reinforcing member 27 shown in Fig. 10(A) may be arranged in the wing tank 22. Although not shown, only a part of the three strength reinforcing members 27 shown in Fig. 10(A) may be arranged in the wing tank 22.

[0067] As in the fifth modification of the third embodiment shown in Fig. 10(C), the strength reinforcing member 27 shown in Fig. 10(A) may be replaced with the wash bulkhead 21e. At this time, the horizontal girder 21f of the wash bulkhead 21e may be arranged on the same side (the right side in the figure) as the other horizontal girders 21b and 22b, or a part of the horizontal girder 21f may be arranged on the opposite side (the left side in the figure) to the other horizontal girders 21b and 22b.

[0068] Next, the tank arrangement configuration of the hull structure 2 according to the fourth embodiment will be described with reference to Figs. 11(A) and 11(B). Here, Fig. 11 is a partially enlarged view of the hull structure, where (A) is the fourth embodiment and (B) is a modification of the fourth embodiment.

[0069] As shown in Fig. 11(A), the hull structure 2 according to the fourth embodiment is obtained by changing the positional relationship between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 from that of the third embodiment. Specifically, the deviation amount D of the transverse bulkhead 22a of the wing tank 22 on the lower side of the figure shown in Fig. 9(A) is changed to 0.3 times the tank length Lw (D = 0.3Lw).

[0070] Therefore, in the hull structure 2 according to the fourth embodiment, the deviation amount D between the transverse bulkhead 21a of the center tank 21 and the transverse bulkhead 22a of the wing tank 22 is the same numerical value, but the transverse bulkhead 22a of the wing tank 22 on the upper side of the figure and the transverse bulkhead 22a of the wing tank 22 on the lower side of the figure are arranged at different positions in the ship length direction X. Thus, the deviation amount D between the transverse bulkhead 21a and the transverse bulkhead 22a can be arbitrarily changed.

[0071] The hull structure 2 according to the fourth embodiment includes a transverse web 21c in the center tank 21 and a wash bulkhead 22c in the wing tank 22. The wash bulkhead 22c is arranged at a position corresponding to approximately the middle between the transverse bulkhead 21a and the transverse bulkhead 22a. The horizontal girder 21f of the wash bulkhead 21e may be arranged on the same side (the right side of the figure) as the other horizontal girders 21b, 22b, or a part of the horizontal girder 21f may be arranged on the opposite side (the left side of the figure) to the other horizontal girders 21b, 22b.

[0072] In addition, in the fourth embodiment shown in Fig. 11(A), the strength reinforcement member 27 is omitted, but after determining the positions of the transverse bulkheads 21a, 22a and the wash bulkhead 22c, the strength reinforcement member 27 may be arranged as needed.

[0073] As in the modification of the fourth embodiment shown in FIG. 11(B), a wash bulkhead 21e may be arranged in the center tank 21, and a transverse web 22f may be arranged in the wing tank 22. The wash bulkhead 21e is arranged, for example, at a position corresponding to the upper and lower transverse bulkheads 22a. In addition, if necessary, a strength reinforcing member 27 may be arranged.

[0074] In the above-described first to fourth embodiments (including each modification), the deviation amount D between the transverse bulkhead 21a and the transverse bulkhead 22a has been described for the cases of 0.2 times, 0.3 times, and 0.5 times with respect to the tank length Lc or the tank length Lw. However, the deviation amount D is not limited to these numerical values. For example, the deviation amount D can be arbitrarily set within the range of 0.1 times to 0.5 times with respect to the tank length Lc or the tank length Lw.

[0075] In the above-described embodiments, for the sake of convenience of explanation, the deviation amount D is set based on the length obtained by dividing the tank length Lc or the tank length Lw into ten equal parts. However, the reference length for setting the deviation amount D can be arbitrarily set. In addition, the arrangement of the wash bulkheads 22c, 21e and the strength reinforcing member 27 is not limited to the illustrated embodiments and modifications.

[0076] In the above-described embodiments, the case where the hull structure 2 is divided into three in the ship width direction Y has been described. However, the present invention is not limited to such a configuration. The hull structure 2 may be divided into two, for example, in the ship width direction Y, or may be divided into four or more.

[0077] The present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

Explanation of Reference Numerals

[0078] 1 Ship 2 Hull structure 3 Bow 4 Stern 21 Center tank 21a Transverse bulkhead 21b Horizontal girder 21c Transverse web 21d Transverse ring 21e Swash bulkhead 21f Horizontal girder 22 Wing tank 22a Transverse bulkhead 22b Horizontal girder 22c Swash bulkhead 22d Deck transom 22e Horizontal girder 22f Transverse web 23 Longitudinal bulkhead 24 Side part 25 Bottom part 26 Ceiling part 27 Strength reinforcement member 31 Bath bow 41 Propeller 42 Rudder 43 Living area

Claims

1. In a hull structure having a plurality of tanks partitioned in the longitudinal direction and the beam direction of the ship, the plurality of tanks are cargo tanks for accommodating the cargo to be transported, and include a plurality of center tanks arranged along the center line of the hull and a plurality of wing tanks arranged on both sides of the center tanks, the center tank and the wing tank adjacent to each other in the beam direction include a configuration in which a transverse bulkhead partitioning the center tank in the longitudinal direction and a transverse bulkhead partitioning the wing tank in the longitudinal direction are arranged at different positions in the longitudinal direction, the transverse bulkhead of the center tank includes a configuration in which it is arranged offset in the longitudinal direction with respect to the transverse bulkhead of the wing tank, the wing tank at a position corresponding to the transverse bulkhead of the center tank includes a single space partitioned by a longitudinal bulkhead partitioning the center tank and the wing tank in the beam direction, a side portion of the hull structure, a bottom portion of the hull structure, and an upper deck of the hull structure, the center tank at a position corresponding to the transverse bulkhead of the wing tank includes a single space partitioned by a longitudinal bulkhead partitioning the center tank and the wing tank in the beam direction, a bottom portion of the hull structure, and an upper deck of the hull structure, the side portion and the bottom portion of the hull structure are constituted by double bulkheads, A hull structure characterized by the above.

2. The hull structure according to claim 1, wherein the transverse bulkheads constituting both ends of the hull structure are arranged at the same position in the longitudinal direction.

3. The hull structure according to claim 1, wherein the plurality of tanks are provided with transverse webs or wash bulkheads that can contribute to reducing sloshing.

4. The hull structure according to claim 1, wherein the plurality of tanks are provided with strength reinforcing members arranged in the beam direction.

5. The hull structure according to claim 1, wherein the plurality of tanks have substantially the same tank length.

6. A ship characterized by comprising the hull structure according to any one of claims 1 to 5.

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