KR102106683B1 - Ship - Google Patents

Abstract

The ship 10 includes a cargo tank 20 having a hull 11 and an upper non-spherical shape portion 23 whose diameter dimension gradually decreases upwards, a raised portion 31, and an upper cover portion 34 ), The tank cover 30 and the passage portion 40 formed on the upper portion of the raised portion 31 and extending in the circumferential direction of the raised portion 31 along the inner circumferential surface 31g of the cargo tank 20 side And a hatch 41 formed on the upper portion of the rising portion 31 and communicating the inner circumferential surface 31g side and the outer circumferential surface 31f side of the rising portion 31, and the cargo tank 20 in the rising portion 31 ) It is formed on the outer circumferential surface 31f of the opposite side, and is provided with the lifting part 42 which can be moved up and down between the upper deck 12 and the hatch 41.

Description

Ship {SHIP}

This invention relates to a ship.

This application claims priority based on Japanese Patent Application No. 2017-134900 for which it applied to Japan on July 10, 2017, and uses the content here.

Vessels carrying liquefied gas such as LNG (Liquefied Natural Gas) are equipped with a cargo tank for receiving the liquefied gas. Cargo tanks are generally arranged in a cargo-mounting section (cargo hold) on the bow side rather than the superstructure. The cargo tank is formed by protruding its upper portion upward from the upper deck formed in the cargo loading section.

In order to protect the cargo tank, such a vessel is provided with a tank cover that covers a portion projecting upward from the upper deck in the cargo tank.

A gap is formed between the cargo tank and the tank cover to allow the worker to enter in order to perform installation work, maintenance work, or the like.

For example, as disclosed in Patent Literature 1, in order for the operator to enter the internal gap from the outside of the tank cover, an entrance such as a manhole is formed in the tank cover. Further, inside the tank cover, a passage portion for a worker entering the tank cover from the doorway to move the inside of the tank cover in the horizontal direction, and a lifting portion such as a trap for moving in the vertical direction are formed.

Japanese Patent Application Publication No. Hei 8-99690

However, if it is desired to secure the capacity of the cargo tank as much as possible, it is desirable to make the clearance between the cargo tank and the tank cover as small as possible. However, if a passage portion or a lift portion is formed in the gap between the tank cover and the cargo tank, it is prevented from reducing the gap between the cargo tank and the tank cover.

It is an object of the present invention to provide a vessel capable of reducing the gap between the tank cover and the cargo tank and increasing the capacity of the cargo tank while forming the passage portion or the lifting portion.

According to the first aspect of the present invention, a ship is formed with a hull, a cargo tank having an upper shaft diameter portion formed to protrude an upper portion from the upper deck of the hull and gradually decreasing in diameter from downward to upward, and the cargo tank. A tank cover having a normal cover portion covering the outer surface in the radial direction and extending in the vertical direction, and an upper cover portion formed on the upper portion and covering the upper portion of the cargo tank from above, and the upper portion of the raised portion. It is formed, a passage portion extending in the circumferential direction of the rising portion along an inner surface of the side close to the cargo tank, and a communication portion formed on the upper portion of the rising portion to communicate the inner surface side and the outer surface side of the rising portion, the It is formed on the outer surface of the opposite side of the cargo tank in the rising portion, and the lifting portion capable of moving up and down between the upper deck and the communicating portion Be equipped.

Thus, by forming the passage portion on the upper portion of the raised portion and forming the raised portion on the outer surface of the raised portion, there is no need to secure a space for forming the passage portion or the raised portion between the tank cover and the cargo tank in the lower portion of the raised portion. Therefore, the passage portion and the lifting portion can be provided while reducing the gap between the tank cover and the cargo tank, and the diameter of the cargo tank can be increased.

According to the 2nd aspect of this invention, the said passage part which concerns on 1st aspect may be formed in the radial direction outer side of the said upper shaft diameter part above the largest diameter part of the said cargo tank in the up-down direction.

Since the cargo tank has an upper shaft portion, the clearance between the riser portion of the tank cover and the upper shaft portion of the cargo tank increases from downward to upward. Therefore, in a portion where the clearance between the riser portion of the tank cover and the upper shaft diameter portion of the cargo tank is larger than the maximum diameter portion of the cargo tank, the passage portion is formed on the outer side in the radial direction of the upper shaft portion to form a cargo. The passage can be installed without interfering with the tank.

According to the third aspect of the present invention, even if the passage portion according to the second aspect has a larger width dimension in the radial direction of the tank cover than the clearance between the tank cover and the cargo tank in the maximum diameter portion. do.

Thus, by forming the passage portion above the maximum diameter portion of the cargo tank, the width dimension of the passage portion can be made larger than the gap below the passage portion, and the mobility of the worker is increased.

According to the fourth aspect of the present invention, a ship related to any one of the first to third aspects is formed below the passage portion, and an inner step communicating with the communicating portion from the inner surface side of the rising portion. A portion, and an inner elevation portion that can be elevated between the inner step portion and the passage portion may be provided.

With this configuration, when the worker enters and exits the tank cover, it is possible to reach the passage portion through the elevator portion, the inner step portion, and the inner elevator portion. Since the passage portion is located above the inner step portion, the width dimension of the passage portion can be increased with respect to the inner step portion. Therefore, the mobility of the worker can be improved.

According to the said vessel, the clearance between a tank cover and a cargo tank can be made small, and the capacity of a cargo tank can be increased, forming a passage part or a lifting part.

1 is a side view showing the overall configuration of a ship in the embodiment of the present invention.
2 is a plan view showing the overall configuration of the vessel.
3 is a half sectional view of the cargo tank and the tank cover formed on the ship as viewed from the forefoot direction.
Fig. 4 is a half sectional view of the cargo tank and tank cover of the ship in a modified example of the above embodiment, as viewed from the bowing direction.

Hereinafter, the ship in embodiment of this invention is demonstrated based on drawing.

1 is a side view showing the overall configuration of a ship in the embodiment of the present invention. 2 is a plan view showing the overall configuration of the vessel.

1 and 2, the ship 10 of this embodiment carries liquefied gas such as liquefied natural gas (LNG) as dropping. The ship 10 includes at least a hull 11, an upper deck 12, an upper structure 17, a cargo tank 20, and a tank cover 30.

The hull 11 has a pair of front sides 14. The hull 11 is provided with a cargo mounting section (hold) 15 between a pair of stringers 14 on the side of the bow 11c side, rather than the upper structure 17 having a housing.

The upper deck 12 is a whole upper deck exposed to the outside, and is formed to cover the upper portion of the cargo loading section 15. The upper structure 17 described above is formed on the upper deck 12 on the stern 11d side from the cargo loading section 15.

The cargo tank 20 is made of, for example, an aluminum alloy, and contains liquefied gas to be transported therein. The cargo tanks 20 are arranged in the cargo loading section 15 in the bow direction (Da) connecting the bow 11c side and the stern 11d side of the hull 11, and are arranged in plural. Each cargo tank 20 is formed by protruding its upper portion 20a above the upper deck 12 of the hull 11.

3 is a half cross-sectional view of the cargo tank and the tank cover formed on the ship, as viewed from the forefoot direction.

As shown in FIG. 3, each cargo tank 20 is provided with a lower hemispherical portion 21, a cylindrical upper portion (maximum diameter portion) 22, and an upper non-spherical shape portion (upper shaft diameter portion) 23. Doing.

The lower hemispherical portion 21 has a spherical shape having a constant radius of curvature at the lower portion of the cargo tank 20.

The cylindrical upper portion 22 is formed in the middle portion of the cargo tank 20 in the vertical direction Dv, and extends upward from the upper end of the lower hemispherical portion 21. The cylindrical portion 22 is formed into a cylindrical shape having a constant inner diameter. The cylindrical upper portion 22 forms the largest diameter portion of the cargo tank 20 in the vertical direction Dv.

In addition, here, the cylindrical upper part 22 can also be made into a conical trapezoid whose inner diameter gradually increases or decreases from downward to upward.

The upper non-spherical shape portion 23 is formed on the cylindrical portion 22, that is, on the upper portion 20a of the cargo tank 20. The upper non-spherical shape portion 23 is gradually reduced in diameter from downward to upward.

In this embodiment, the upper non-spherical shape portion 23 is formed so that the radius of curvature increases in a stepwise manner from the bottom to the top. That is, the upper non-spherical shape portion 23 is formed below the first curved portion 23a having the radius of curvature R1 and the upper portion of the first curved portion 23a, and the radius of curvature R1 It has a second curved portion 23b having a larger radius of curvature R2. In addition, the cargo tank 20 is not limited to the shape shown above. The cargo tank 20 may have the upper non-spherical shape portion 23 in a spherical shape, or may have a spherical shape without the cylindrical portion 22.

Here, an insulating material (not shown) that suppresses heat input from the outside is formed on the outer surface of the cargo tank 20 described above.

In addition, a dome tower 25 protruding upward is formed at the top portion 20t of the cargo tank 20. On the upper portion of the dome tower 25, an awning portion 26 that extends outward in the radial direction is integrally formed.

The tank cover 30 is formed on the upper deck 12 of the hull 11 so as to cover the upper portion 20a of the cargo tank 20 from above. The tank cover 30 is provided with a rising part 31 and an upper cover part 34.

The rising part 31 is formed so as to rise upward from the upper deck 12. The raised portion 31 is formed in a cylindrical shape having a constant inner diameter in the vertical direction Dv. When viewed from a plane (see FIG. 2), the raised portion 31 is formed to be spaced from the outer side in the radial direction of the cargo tank 20 and to surround the entire circumference of the cargo tank 20 from the outer side in the radial direction. . The upper end 31t of the rising portion 31 is disposed above the upper end 22t of the cylindrical upper portion 22.

The upper cover portion 34 is formed on the raised portion 31 and covers the upper portion 20a of the cargo tank 20 from above. The upper cover portion 34 is provided with a ceiling surface portion 32 and a spherical shape portion 33.

The ceiling surface portion 32 is disposed upward so as to face the top portion 20t of the cargo tank 20. The ceiling surface portion 32 is formed in a flat shape located in a horizontal plane.

An opening portion 32h is formed in the central portion of the ceiling surface portion 32. The dome tower 25 formed on the top portion 20t of the cargo tank 20 protrudes upward through this opening portion 32h. The awning part 26 is formed spaced upwardly with respect to the ceiling surface part 32. The shading portion 26 has an outer diameter larger than the inner diameter of the opening 32h.

The sprue-shaped part 33 is formed so as to connect the rising part 31 and the ceiling surface part 32. The true spherical shape portion 33 is formed with a constant radius of curvature R4.

In addition, the plurality of reinforcing members 35 spaced apart in the vertical direction (Dv) on the outer circumferential surface (outer surface) 31f on the side opposite to the cargo tank 20 side in the rising portion 31 of the tank cover 30 ) Is formed. Each of the reinforcing members 35 has a L-shaped cross section or a T-shaped cross section, and extends in the horizontal direction and continues in the circumferential direction of the tank cover 30.

The above-described vessel 10 includes, for each tank cover 30, a passage portion 40, a hatch (communication portion) 41, a lifting portion 42, an inner step portion 45, and an inner side. The elevation part 46 is further provided.

The passage portion 40 is formed along the inner circumferential surface (inner surface) 31g on the side close to the cargo tank 20 at the upper portion of the raised portion 31. The passage part 40 is continuously formed in the circumferential direction of the raising part 31. The passage portion 40 includes a floor portion 40a and a handrail portion 40b. The outer circumferential end of the floor portion 40a is joined to the rising portion 31. The floor part 40a is located in a horizontal surface, and the upper surface is made to allow an operator to walk. The railing portion 40b is formed to extend upward from the inner circumferential end of the floor portion 40a.

In addition, the passage portion 40 is disposed in the radial direction outer side of the upper non-spherical shape portion 23 above the cylindrical portion 22 of the cargo tank 20 in the vertical direction. Further, the passage portion 40 is in the radial direction of the tank cover 30 rather than the width dimension W1 of the clearance 100S between the tank cover 30 and the cargo tank 20 in the cylindrical portion 22. The width dimension W2 in is large.

The hatch 41 is formed on the upper portion of the raised portion 31 and communicates with the inner peripheral surface 31g side and the outer peripheral surface 31f side of the raised portion 31. The hatch 41 can be opened and closed by a door (not shown). This hatch 41 is formed below the floor portion 40a of the passage portion 40, and the worker is allowed to enter and exit the tank cover 30 through the hatch 41.

With respect to the hatch 41, an outer step portion 44 is formed outside the raised portion 31 in the radial direction. The outer step portion 44 is joined to the outer circumferential surface 31f on the side opposite to the cargo tank 20 side in the raised portion 31.

The lifting portion 42 is formed on the outer peripheral surface 31f of the raising portion 31. The elevating portion 42 extends in the vertical direction so as to connect between the upper deck 12 and the outer step portion 44 formed on the outer side in the radial direction of the hatch 41. The elevating section 42 is made of a ladder, a staircase, and the like, which the operator can elevate.

The inner step portion 45 is formed below the passage portion 40 on the inner circumferential surface 31g side of the rising portion 31. The inner step portion 45 is disposed on the inner circumferential surface 31g side of the raised portion 31 with respect to the hatch 41. Here, the width dimension W3 of the inner step portion 45 is smaller than the width dimension W2 of the passage portion 40.

The inner elevating portion 46 is formed of a ladder, a staircase, or the like formed between the inner step portion 45 and the passage portion 40. The inner lifting part 46 is formed so that a worker can lift between the inner stepping part 45 and the passage part 40.

In order for the worker to reach the passage portion 40 in the tank cover 30, first, the worker climbs the elevating portion 42 from above the upper deck 12, and from the outer step portion 44, the hatch 41 Through, it moves to the inner step part 45 in the tank cover 30. In addition, in the tank cover 30, the worker climbs the inner lifting portion 46 from the inner step portion 45, thereby reaching the passage portion 40.

Therefore, according to the ship 10 of the above-mentioned embodiment, the passage part 40 is formed on the upper part of the rising part 31, and the lifting part 42 is formed on the outer peripheral surface 31f of the rising part 31. By doing so, it is necessary to secure a space for forming the passage portion 40 or the lifting portion 42 in the gap 100S between the tank cover 30 and the cargo tank 20 in the lower portion of the rising portion 31. Disappears. As a result, the passage portion 40 or the lifting portion 42 can be provided while reducing the gap 100S between the tank cover 30 and the cargo tank 20. As a result, the diameter of the cargo tank 20 can be increased, and the capacity of the cargo tank 20 can be increased.

Moreover, the passage part 40 is formed in the radial direction outer side of the upper non-spherical shape part 23 above the cylindrical upper part 22 of the cargo tank 20 in the vertical direction. According to such a structure, since the cargo tank 20 has the upper non-spherical shape portion 23, from the lower side to the upper side, the rising portion 31 of the tank cover 30 and the cargo tank 20 are The gap in the radial direction of the upper non-spherical shape portion 23 becomes large. Thereby, the passage part 40 is formed on the outer side in the radial direction of the upper non-spherical-shaped part 23 above the cylindrical top part 22 of the cargo tank 20, thereby forming the passage part 40 in the cargo tank ( 20) Can be installed without interference.

Further, the passage portion 40 is in the radial direction of the tank cover 30 rather than the width dimension W1 of the clearance 100S between the tank cover 30 and the cargo tank 20 in the cylindrical portion 22. The width dimension W2 in can be enlarged. Thereby, the mobility of the worker in the passage 40 is increased.

In addition, an inner step portion 45 was formed below the passage portion 40. The width dimension of the passage portion 40 can be increased with respect to the inner step portion 45 formed in the portion where the gap between the tank cover 30 and the cargo tank 20 is smaller than the passage portion 40. Thereby, the mobility of the worker can be improved.

(Modified example of the embodiment)

In the above embodiment, the inner step portion 45 and the inner elevation portion 46 are provided, but the configuration is not limited to this.

4 is a half sectional view of the cargo tank and tank cover of the ship in a modified example of the above embodiment, as viewed from the forefoot direction.

4, each tank cover 30 in this modification is provided with the passage part 40, the hatch (communication part) 41B, and the lifting part 42B.

The passage portion 40 is formed along the inner circumferential surface 31g on the side of the cargo tank 20 at the upper portion of the raised portion 31. The passage part 40 is continuously formed in the circumferential direction of the raising part 31.

The hatch 41B is formed on the upper portion of the raised portion 31. The hatch 41B is formed above the floor portion 40a of the passage portion 40, and the worker is allowed to enter and exit the inside of the tank cover 30 through the hatch 41B. With respect to the hatch 41B, an outer step portion 44B is formed on the outer side in the radial direction of the raised portion 31.

The lifting portion 42B is formed on the outer circumferential surface 31f on the side opposite to the cargo tank 20 side in the rising portion 31. The lifting part 42 is formed so as to connect between the upper deck 12 and the outer step part 44B formed in the radial direction outer side of the hatch 41B. The lifting portion 42B is made of a ladder, a staircase, or the like, which the worker can lift.

In the modified example of the above-described embodiment, in order for the worker to reach the passage 40 in the tank cover 30, first, the worker lifts the lifting portion 42B from the upper deck 12. Then, the worker reaches the passage portion 40 by moving from the outer step portion 44B through the hatch 41B into the tank cover 30.

Therefore, according to this modified example, in particular, since the inner lifting part 46 is not provided in the tank cover 30, the path through which the worker reaches the passage part 40 can be simplified.

(Other modifications)

This invention is not limited to the above-described embodiment, and includes various changes to the above-described embodiment without departing from the gist of the present invention. That is, the specific shape, configuration, etc. exemplified in the embodiments are only examples, and can be appropriately changed.

For example, the shape of the upper cover portion 34 is not limited to the shapes of the above-described embodiments and modifications.

This invention can be applied to a ship. According to the vessel to which the present invention is applied, the clearance between the tank cover and the cargo tank can be reduced and the capacity of the cargo tank can be increased while forming the passage portion or the elevator portion.

10; Ship
11; hull
11c; player
11d; Stern
12; Upper deck
14; side
15; Cargo loading compartment
17; superstructure
20; Cargo tank
20a; Top
20t; Top
21; Lower hemisphere
22; Cylindrical part (maximum diameter part)
22t; Top
23; Upper non-spherical shape (upper shaft diameter)
23a; First curvature
23b; 2nd curvature
25; Dome tower
26; Sunshade
30; Tank cover
31; Ascent
31f; Outer surface (outer surface)
31 g; Inner surface (inner surface)
31t; Top
32; Ceiling
32h; Opening
33; Jingu Shape
34; Upper cover
35; Reinforcement member
40; Passage
40a; Floor part
40b; Railing
41, 41B; Hatch (Ministry of Communication)
42, 42B; Lift
44, 44B; Outside step part
45; Inner step
46; Inside elevation
100S; Gap
Da; Forward direction
Dv; Up and down direction
W1; Width dimension
W2; Width dimension
W3; Width dimension

Claims (5)

Hull,
The cargo tank is formed to protrude the upper portion from the upper deck of the hull, and has an upper shaft diameter portion whose diameter dimension gradually decreases from downward to upward,
A tank cover which covers the cargo tank from the outside in the radial direction and extends in the vertical direction;
A passage portion formed on an upper portion of the raised portion and extending in a circumferential direction of the raised portion along an inner surface of a side close to the cargo tank,
An upper portion of the raised portion, and a lower portion of the raised portion, communicating with the inner surface side and the outer surface side of the raised portion;
A ship having an elevated portion formed on an outer surface opposite to the cargo tank in the raised portion and capable of moving up and down between the upper deck and the communicating portion. According to claim 1,
The said passage part is a ship formed in the radial direction outer side of the said upper diameter part above the largest diameter part of the said cargo tank in the up-down direction. According to claim 2,
The said passage part is a ship whose width dimension in the radial direction of the said tank cover is larger than the clearance of the said tank cover and the said cargo tank in the said largest diameter part. The method according to any one of claims 1 to 3,
An inner step portion formed below the passage portion and communicating with the communicating portion on the inner surface side of the rising portion,
A ship having an inner lifting portion that can be elevated between the inner stepping portion and the passage portion. Hull,
The cargo tank is formed to protrude the upper portion from the upper deck of the hull, and has an upper shaft diameter portion whose diameter dimension gradually decreases from downward to upward,
A tank cover which covers the cargo tank from the outside in the radial direction and extends in the vertical direction;
A passage portion formed on an upper portion of the raised portion and extending in a circumferential direction of the raised portion along an inner surface of a side close to the cargo tank,
An upper portion of the raised portion, and a communication portion formed above the passage portion to communicate the inner surface side and the outer surface side of the raised portion,
A ship having an elevated portion formed on an outer surface opposite to the cargo tank in the raised portion and capable of moving up and down between the upper deck and the communicating portion.

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