JP6486851B2 - Ship - Google Patents

Description

  The present invention relates to a ship.

  In addition to a cargo hold where cargo that may generate volatile components such as cargo oil is mounted, various equipment is housed in the bow of the ship described in Patent Document 1 below. There is a warehouse called the Bosun Store. When cargo is loaded in a cargo hold in such a ship, a space called a cofferdam must be provided between the cargo hold and the boson store in order to be prepared for any possible spillage of the cargo to the boson store. It has become.

Japanese Patent Laying-Open No. 2015-181546

  A partition wall that partitions the boson store and the void portion described in Patent Document 1 is provided to extend in the width direction orthogonal to the front-rear direction of the hull. From the viewpoint of improving the structural strength of the bow (particularly, the portion closer to the bow than the partition wall), such a partition wall is desired to be further improved in strength.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a ship that can improve the structural strength of the bow.

  A ship according to the present invention is a ship in which a boson store, a void portion, and a cargo hold are provided in order from the bow side in the hull, and includes a partition wall that partitions the boson store and the void portion, A central wall extending in the width direction orthogonal to the longitudinal direction of the hull, a first side wall connected to one end of the central wall in the width direction and connected to the bow skin of the hull, and the other center wall in the width direction A second side wall connected to the end and connected to the bow skin, a bow-side connection angle θ1 formed by the first side wall and the bow skin, and a bow side formed by the second side wall and the bow skin Each of the connection angles θ2 is larger than an angle θ3 on the bow side formed by a virtual line extending in the width direction of the central wall and the bow outer plate.

  According to such a ship, each of the connection angle θ1 formed by the first side wall and the bow outer plate and the connection angle θ2 formed by the second side wall and the bow outer plate are angles formed by the imaginary line and the bow outer plate. It is larger than θ3. For this reason, in the partition wall that divides the boson store and the void portion, the connecting portion between the first side wall and the bow outer plate and the connecting portion between the second side wall and the bow outer plate are respectively connected to the imaginary line and the outside of the bow. It will be located on the bow side of the intersection with the plate. Thereby, compared with the case where the central wall simply extends in the width direction to form a partition wall, the first side wall and the second side wall can favorably support an external force caused by a wave that collides perpendicularly to the bow outer plate, The structural strength of the bow can be improved. By improving the structural strength in this way, the thickness of the partition wall can be reduced, and the weight of the ship can be reduced. In addition, the size of the boson store can be set within an appropriate range while maintaining the distance between the bow and the center wall.

  Here, each of the connection angle θ1 and the connection angle θ2 is preferably 75 ° or more and 105 ° or less. In this case, each of the first side wall and the second side wall is provided with a bow skin as defined in “2015 edition Steel Ship Rules CSR-T, P.66” (published by the Japan Maritime Association). Since it is considered that they are connected at right angles, the thickness of the partition wall can be further reduced.

  The first side wall has a first wall portion extending from the bow outer plate toward the central wall, and a second wall portion on the central wall side extending along a direction different from the first wall portion, In the first wall portion, the end on the central wall side is preferably connected to one end of the second wall portion and a component plate that divides the pressure from the bow outer plate. In this case, when the pressure applied to the bow outer plate by the waves is transmitted to the central wall through the first side wall, a part of the pressure is dispersed by the second wall portion and the force distribution plate. For this reason, stress dispersion | distribution is achieved and the structural strength of a bow part can be improved more suitably.

  As described above, according to the present invention, it is possible to provide a ship capable of improving the structural strength in the vicinity of the bow and setting the area of the boson store within an appropriate range.

It is a schematic side view which shows the whole structure of the ship which concerns on embodiment of this invention. It is an enlarged view of the bow part in FIG. It is an expansion perspective view of the bow part under an upper deck. It is an enlarged plan view of the bow part under the upper deck.

  Hereinafter, preferred embodiments of a ship according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted. The terms “front”, “rear”, “left”, “right”, “upper”, and “lower” correspond to the front-rear direction, the left-right (width) direction, and the vertical direction of the ship, respectively.

  FIG. 1 is a schematic side view showing the overall structure of a ship according to an embodiment of the present invention. As shown in FIG. 1, the ship 1 is used as an oil tanker, and loads cargo oil as cargo. The hull 2 of the ship 1 includes an upper deck 3, an outer plate 4, and a ship bottom 5, and has a bow portion 6, a hull center portion 7, and a stern portion 8 that are sequentially located from the bow 2a side toward the stern 2b side. .

  The bow portion 6 has a sharp shape in plan view (see FIG. 4 to be described later), a spherical bow 11 provided on the lower side thereof, a flared bow 12 provided on the spherical bow 11, and (See also FIG. 2 described later). The spherical bow 11 projects in a spherical shape toward the front so that the external force (wave-making resistance) due to waves can be reduced when the hull 2 moves forward. The flare-shaped bow 12 has a shape (flare shape) in which the outer shape of the bow 2a spreads outward as it goes upward in the vertical direction as a structure that prevents seawater from being launched onto the upper deck 3.

  The hull center portion 7 is a portion that becomes a main body of the hull 2, and a plurality of hulls including a cargo hold 13 on which cargo oil is loaded are provided. The inner wall of the cargo hold 13 is painted to prevent deterioration of cargo oil. The stern portion 8 is provided with a bridge 14, a propulsion device 15 that moves the hull 2 forward or backward, a rudder 16 that controls the propulsion direction of the hull 2, and the like. Further, an engine (not shown) connected to the propulsion device 15 is provided inside the stern portion 8.

  The bow section 6 and the hull center section 7 are partitioned by a collision partition wall 9 that prevents water from entering the entire hull 2 in the event of a collision with another ship. The collision partition wall 9 is a watertight partition wall that is required to be provided at a predetermined position from the bow 2a depending on the ship type or class. The collision partition wall 9 extends in the width direction so as to connect the port-side outer plate 4 and the starboard-side outer plate 4, and functions as a wall on the bow 2 a side of the cargo hold 13.

  Next, referring to FIG. 2, the structure of the bow portion 6, particularly the internal structure thereof will be described in detail. FIG. 2 is an enlarged view of the bow portion in FIG.

  As shown in FIG. 2, in the bow portion 6, there are a first cavity portion 21 located on the bow 2 a side and a second cavity portion 22 located on the stern 2 b side from the first cavity portion 21. And a boson store 23 positioned above the first cavity portion 21 and on the bow 2a side of the second cavity portion 22 is provided.

  The first void portion 21 is a space (void) that can accommodate ballast water. The first cavity portion 21 is located below the ship bottom 5 and the upper deck 3 and is located outside the bow that forms the spherical bow 11 and the flared bow 12 on the inner deck 24 and the outer plate 4 provided in the bow 6. It is defined by a plate 31 (see also FIG. 3 described later) and a partition wall 25 provided in a watertight manner between the bow 2a and the collision partition wall 9 in the front-rear direction. The partition wall 25 is a wall that partitions the first space portion 21 and the second space portion 22 in a watertight manner. The bulkhead 25 extends in the width direction so as to be connected to the port side bow outer plate 31 and the starboard side bow outer plate 31, and includes the bottom 5 and the end of the inner deck 24 on the stern 2 b side. It is extended in the up-and-down direction so that it may be connected to.

  The second void portion 22 is a space (cofferdam) for storing the spilled cargo oil in the unlikely event that the cargo oil in the cargo hold 13 flows out. Similar to the collision bulkhead 9, the second void portion 22 is a space that is obliged to be provided in front of the cargo hold 13 depending on the ship type or classification. The second cavity portion 22 is formed by a ship bottom 5, an upper deck 3, a collision bulkhead 9, a bow outer plate 31, a bulkhead 25, and a partition wall 26 provided in a watertight manner between the bow 2a and the collision bulkhead 9 in the front-rear direction. Is defined. The partition wall 26 is a wall that partitions the second space portion 22 and the boson store 23 in a watertight manner. The partition wall 26 extends in the width direction so as to be connected to the port side bow outer plate 31 and the starboard side bow outer plate 31, and is the end of the upper deck 3 and the inner deck 24 on the stern 2b side. It is extended in the up-down direction so that it may be connected with a part. The detailed structure of the partition wall 26 will be described later.

  The bosun store 23 is a space (warehouse) for storing equipment for maintenance of the ship 1. The boson store 23 is defined by an inner deck 24, an upper deck 3, a bow outer plate 31, and a partition wall 26. The bosun store 23 is connected to the outside of the upper deck 3 through a stair (not shown) provided in the inside. The bosun store 23 is provided with a ventilation mechanism and is painted.

  A chain locker 29 is provided in the first cavity portion 21, the second cavity portion 22, and the boson store 23 in the bow portion 6. The chain locker 29 has a substantially cylindrical shape (see FIG. 3 to be described later) extending in the vertical direction, and protrudes from the upper deck 3 toward the first cavity portion 21 and the second cavity portion 22. ing. As the chain 28 stored in the chain locker 29 is wound up by a winding mechanism (not shown) such as a winch, the kite 27 is lifted on the sea. A part of the chain 28 connecting the rod 27 to the tip is exposed to the outside through an opening (not shown) provided in a part of the bow outer plate 31 that defines the second cavity portion 22, for example. . In the present embodiment, the chain locker 29 has a first chain locker 29a on the starboard side and a second chain locker 29b on the starboard side, and is one of the walls that partitions the second space portion 22 and the boson store 23 in a watertight manner. (See FIG. 3 and FIG. 4 described later).

  Next, the structure of the boson store 23 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is an enlarged perspective view of the bow portion below the upper deck. FIG. 4 is an enlarged plan view of the bow portion below the upper deck.

  First, the partition wall 26 that lays the wall of the boson store 23 will be described in detail. As shown in FIGS. 3 and 4, the partition wall 26 is connected to the center wall 41 extending in the width direction and to one end 41 a of the center wall 41 in the width direction and to the bow outer plate 31 on the port side. It has the 1st side wall 42 and the 2nd side wall 43 connected with the other side 41b of the center wall 41 in the width direction, and being connected with the bow outer side board 31 on the starboard side.

  The central wall 41 is provided so as to be sandwiched between the first chain locker 29a and the second chain locker 29b in the width direction. One end 41a of the central wall 41 in the width direction is watertightly connected to the starboard side surface of the first chain locker 29a. The other end 41b of the central wall 41 in the width direction is watertightly connected to the port side surface of the second chain rocker 29b.

  The first side wall 42 includes a first wall 51 extending from the bow side outer plate 31 toward the central wall 41, and a central wall extending along a direction (front-rear direction) different from the first wall 51. And a second wall 52 on the 41 side. An end 51a of the first wall portion 51 is water-tightly connected to the port-side bow outer plate 31. Further, the end 51 b on the central wall 41 side in the first wall portion 51 is connected to the front end 52 a in the second wall portion 52 in a watertight manner. The rear end 52b of the second wall 52 is located closer to the bow 2a than the one end 41a of the central wall 41, and is watertightly connected to the port side surface of the first chain locker 29a.

  The connecting angle θ1 on the bow 2a side formed by the end 51a of the first wall portion 51 on the first side wall 42 and the bow side outer skin 31 is an imaginary line VL extending in the width direction of the central wall 41 and the bow on the port side. It is larger than the angle θ 3 on the bow 2 a side formed by the outer plate 31. This connection angle θ1 is set to 75 ° or more and 105 ° or less. Accordingly, the first wall 51 is considered to be connected to the bow outer plate 31 at a right angle as defined in “2015 edition Steel Ship Rules CSR-T, P. 66”. Further, since the connection angle θ1 is larger than the angle θ3, the end 51a of the first wall portion 51 (that is, the connection portion between the first wall portion 51 and the bow outer plate 31) is connected to the virtual line VL and the port side. It is located on the bow 2a side from the intersection A1 with the bow outer plate 31 on the side.

  The volume of the first side wall 42 is preferably smaller than the volume of the side wall when the side wall is provided along the virtual line VL. Thereby, the partition wall 26 can be reduced in weight compared with the case where the central wall 41 is simply extended in the width direction to form the partition wall.

  The second side wall 43 includes a third wall portion 53 extending from the starboard side outer skin 31 toward the central wall 41, and a central wall extending along a direction (front-rear direction) different from the third wall portion 53. And a fourth wall 54 on the 41 side. An end 53a of the third wall portion 53 is water-tightly connected to the starboard side bow outer plate 31. Further, the end 53 b of the third wall portion 53 on the central wall 41 side is connected to the front end 54 a of the fourth wall portion 54 in a watertight manner. The rear end 54b of the fourth wall portion 54 is located closer to the bow 2a than the other end 41b of the central wall 41, and is watertightly connected to the starboard side surface of the second chain locker 29b.

  The connecting angle θ2 on the bow 2a side formed by the end 53a of the third wall portion 53 on the second side wall 43 and the starboard side bow outer plate 31 is the bow 2a side formed by the virtual line VL and the starboard side bow outer plate 31. Is larger than the angle θ4. The connection angle θ2 is set to 75 ° or more and 105 ° or less for the same reason as the connection angle θ1. Since the connection angle θ2 is larger than the angle θ4, the end 53a of the third wall portion 53 is located closer to the bow 2a than the intersection A2 between the virtual line VL and the starboard side bow outer plate 31. Yes.

  Similarly to the first side wall 42, the volume of the second side wall 43 is preferably smaller than the volume of the side wall when the side wall is provided along the virtual line VL.

  The first side wall 42 and the second side wall 43 are substantially line symmetric with respect to a center line extending in the front-rear direction. For this reason, the first side wall 42 and the second side wall 43 have substantially the same volume, and the connection angle θ1 and the connection angle θ2 are substantially the same. This makes it difficult for a difference in pressure resistance against an external force or the like due to waves to occur between the port side and the starboard side of the bow outer plate 31.

  Next, the strength member provided in the boson store 23 will be described. A plurality of web frames 61 for improving the strength of the bow outer plate 31 are provided in the boson store 23. Each of the plurality of web frames 61 is a plate-shaped steel material that extends in the vertical direction from the inner deck 24 to the upper deck 3 and is connected to the bow outer plate 31. In the boson store 23, a total of five web frames 61 are provided, two on the port side, one on the center in the width direction, and two on the starboard side. The web frames 61 are provided at a predetermined distance from each other along the circumferential direction of the bow outer plate 31. A protruding portion that protrudes toward the center of the boson store 23 is provided at the upper end of each web frame 61.

  The protruding portion (hereinafter referred to as “central bone 62”) of the web frame 61 located at the center in the width direction is a rod-shaped steel material, and collides with the second cavity portion 22 side from the bow 2a through the central wall 41. It extends in the front-rear direction so as to reach the partition wall 9. The central bone 62 is connected to the bottom of the upper deck 3 (not shown) so as to support the upper deck 3 in the vertical direction.

  Further, deck transformers 63 to 65 arranged in order from the bow 2a side are connected to the bottom of the upper deck 3. Each of the deck transformers 63 to 65 is a plate-shaped steel material that extends in the width direction perpendicular to the central bone 62. Each of the deck transformers 63 and 64 is connected to a corresponding web frame 61. Specifically, one end of the deck transformer 63 is connected to the protruding portions of the web frames 61 and 61 on the port side and starboard side, and the other end of the deck transformer 63 is connected to the central central bone 62. . One end of the deck transformer 64 is connected to the protruding portions of the web frames 61 and 61 on the port side and the starboard side, and the other end of the deck transformer 64 is connected to the central central bone 62.

  The deck transformer 65 is connected to the first side wall 42 and the second side wall 43 with respect to the deck transformers 63 and 64. One end of the deck transformer 65 is connected to a connecting portion between the first wall portion 51 and the second wall portion 52, and the other end of the deck transformer 65 is connected to a connecting portion between the third wall portion 53 and the fourth wall portion 54. It is connected. For this reason, the pressure transmitted from the bow side outer plate 31 to the first wall 51 is divided into the second wall 52 and the deck transformer 65. The pressure transmitted from the starboard side outer skin 31 to the third wall portion 53 is divided into the fourth wall portion 54 and the deck transformer 65. Therefore, the deck transformer 65 functions as a component plate for the first side wall 42 and the second side wall 43.

  In the boson store 23, small bones 66a and 66b connecting the deck transformers 63 and 64 and small bones 67a and 67b connecting the deck transformers 64 and 65 are provided. Each of the small bones 66a, 66b, 67a, 67b is a rod-shaped steel material extending in parallel with the central bone 62.

  The front end of the small bone 66 a is connected to the connecting portion between the web frame 61 on the port side front and the deck transformer 63, and the rear end of the small bone 66 a is connected to the port side of the deck transformer 64. . The front end of the small bone 66b is connected to the connecting portion between the web frame 61 on the starboard side front and the deck transformer 63, and the rear end of the small bone 66b is connected to the starboard side of the deck transformer 64. . The front end of the small bone 67a is connected to the connecting portion between the web frame 61 on the port side rear side and the deck transformer 64 on the port side in the width direction of the small bone 66a, and the rear end of the small bone 67a is connected to the deck. It is connected to the port side of the transformer 65. The front end of the small bone 67a is on the starboard side in the width direction of the small bone 66b, and is connected to the connecting portion between the web frame 61 on the starboard side rear side and the deck transformer 64, and the rear end of the small bone 67b is connected to the deck. It is connected to the starboard side of the transformer 65.

  In the boson store 23, a small bone 68a that connects the web frames 61 on the starboard side and a small bone 68b that connects the web frames 61 on the starboard side are provided. Each of the small bones 68a and 68b is a rod-shaped steel material like the small bones 66a and the like.

  In the boson store 23, a pillar 69a connected to a connecting portion between the central bone 62 and the deck transformer 64 and a pillar 69b connected to a connecting portion between the central bone 62 and the deck transformer 65 are provided. Each of the pillars 69a and 69b is a column erected from the inner deck 24, and supports the upper deck 3 via the central bone 62 in the vertical direction.

  According to the ship 1 according to the present embodiment described above, the connection angle θ1 formed by the first side wall 42 and the bow outer plate 31 and the connection angle θ2 formed by the second side wall 43 and the bow outer plate 31 are respectively The angles θ3 and θ4 formed by the virtual line VL and the bow outer plate 31 are larger. Therefore, in the partition wall 26 that divides the boson store 23 and the second cavity portion 22, the connecting portion between the first side wall 42 and the bow outer plate 31, and the connecting portion between the second side wall 43 and the bow outer plate 31. Are positioned closer to the bow 2a than the intersections A1, A2 between the virtual line VL and the bow outer plate 31. Accordingly, the first side wall 42 and the second side wall 43 preferably have an external force caused by a wave colliding perpendicularly to the bow outer plate 31 as compared with the case where the central wall 41 is simply extended in the width direction to form a partition wall. The structural strength of the bow 6 can be improved. By improving the structural strength in this manner, the thickness of the partition wall 26 can be reduced, and the weight of the ship 1 can be reduced.

  In addition, according to the ship 1 according to the present embodiment, the width of the boson store 23 can be set to an appropriate range while maintaining the distance between the bow 2a and the central wall 41 in the front-rear direction. Thereby, the coating area in the boson store 23 can be suppressed, and the cost of the ship 1 can be reduced.

  Further, since each of the connection angle θ1 and the connection angle θ2 is 75 ° or more and 105 ° or less, each of the first side wall 42 and the second side wall 43 is “2015 edition Steel Ship Rules CSR-T, P. 66 ”, since it is considered that the bow skin 31 is connected to the bow skin 31 at a right angle, the bow skin 31 can be supported more favorably, so that the thickness of the partition wall 26 can be further reduced. it can.

  The first side wall 42 extends from the bow outer plate 31 toward the central wall 41 and the second wall on the side of the central wall 41 extending along a direction different from the first wall 51. An end 51b on the central wall 41 side of the first wall 51 is connected to an end 52a of the second wall 52 and a deck transformer 65 that divides the pressure from the bow outer plate 31. Therefore, when the pressure applied to the bow outer plate 31 by the waves is transmitted to the central wall 41 through the first side wall 42, a part of the pressure is dispersed by the second wall portion 52 and the deck transformer 65. For this reason, stress dispersion | distribution is achieved and the structural strength of the bow part 6 can be improved more suitably.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the first chain locker 29a and the second chain locker 29b are used as part of the wall of the boson store 23. However, the first chain locker 29a and the second chain locker 29b are used as the wall of the boson store 23. May not be configured. For example, the first chain locker 29 a and the second chain locker 29 b may be provided in the second space portion 22. In this case, the central wall 41 and the first side wall 42 are connected to each other in a watertight manner, and the central wall 41 and the second side wall 43 are connected to each other in a watertight manner.

  Moreover, in the said embodiment, although the 1st side wall 42 has the 1st wall part 51 and the 2nd wall part 52, it is not restricted to this. The first side wall 42 may be a single linearly extending wall. Similarly, the second side wall 43 may be a single linearly extending wall.

  Moreover, in the said embodiment, although the 1st side wall 42 and the 2nd side wall 43 are substantially line symmetrical in the centerline extended in the front-back direction, it is not restricted to this.

  Moreover, in the said embodiment, connection angle (theta) 1 and (theta) 2 may be larger than 105 degrees. Even in this case, the structural strength in the vicinity of the bow 2a in the bow portion 6 can be improved as compared with the case where the partition wall is formed by simply extending the central wall 41 in the width direction.

  In the above embodiment, a plurality of outer plate longages supported by the web frame 61, the first side wall 42, or the second side wall 43 may be provided on the inner side of the bow outer plate 31. In this case, the strength of the bow outer plate 31 is improved, and the external force applied to the bow outer plate 31 by the waves is easily distributed evenly to the first side wall 42, the second side wall 43, and the web frame 61.

  Moreover, in the said embodiment, although the ship 1 is an oil tanker, it is not restricted to this. For example, the ship 1 may carry liquefied natural gas or the like as cargo.

  DESCRIPTION OF SYMBOLS 1 ... Ship, 2 ... Hull, 2a ... Bow, 2b ... Stern, 3 ... Upper deck, 4 ... Outer plate, 6 ... Bow part, 9 ... Collision bulkhead, 11 ... Spherical bow, 12 ... Flare-like bow, 13 ... Cargo Clamp, 21 ... 1st cavity part, 22 ... 2nd cavity part, 23 ... Bosun store, 24 ... Internal deck, 25 ... Bulkhead, 26 ... Partition wall, 29 ... Chain locker, 29a ... 1st chain locker, 29b ... 2nd chain locker, 31 ... bow outer plate, 41 ... central wall, 41a ... one end, 41b ... other end, 42 ... first side wall, 43 ... second side wall, 51 ... first wall portion, 52 ... second wall Part, 61 ... web frame, 62 ... central bone, 63-65 ... deck transformer, A1, A2 ... crossing part, VL ... virtual line, [theta] 1, [theta] 2 ... connection angle, [theta] 3, [theta] 4 ... angle.

Claims (7)

A vessel and a partitioned space positioned at the end portion in the longitudinal direction of the ship body in the hull, the cavity portion adjacent to the longitudinal direction with respect to the compartment space, are provided,
A partition wall that partitions the partition space and the void portion;
The partition wall is connected to the outer plate of the hull ,
Wherein said end-side connecting angle of the formed between the outer plate of the partition wall and the vessel body, the said end portion formed by the outer plate in the longitudinal direction and the imaginary line extending in a width direction orthogonal the ship body also large Ri by the angles,
Ship. The connecting angle degree is 75 ° or more 105 ° or less, a ship of claim 1, wherein. The partition wall is connected to a component force plate to component force of the pressure of the skin or al of the ship body, according to claim 1 or 2 vessel according. The ship according to any one of claims 1 to 3, wherein the imaginary line extends in the width direction from a position closest to the void portion in the partition wall in the front-rear direction. The partition wall has a central wall extending in the width direction, and a side wall connected to the outer plate of the hull,
  5. The ship according to claim 1, wherein the imaginary line is obtained by extending the central wall in the width direction. A chain locker for storing the chain;
  The marine vessel according to claim 5, wherein the side wall and the central wall are respectively connected to the chain locker. The ship according to any one of claims 1 to 6, wherein the partition space is located closer to the bow than the space portion.

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