JP3051184U - Hull structure of bulk carrier - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To increase the residual capacity of a bulk carrier after being immersed, eliminate the cause of damage, reduce the structural weight, reduce the operation during cargo handling, and spill heavy oil when the outer plate is damaged. To prevent environmental pollution. SOLUTION: The cross section of the hold has a double tank 2 structure at the center of the bottom, a hopper tank 3 on both sides of the bottom, and a top side tank 4 on both sides below the upper deck, and the lower hopper tank 3 and the upper top side tank 4 are respectively provided. In a hull structure of a bulk carrier connected by a ship side plate, a cargo hold A is divided into _six hold A _{1 to} A ₆ by five walls, and the ship side of the hold is a double hull 6A, 6B structure. A small bone 7 of the inner wall was provided in the double hull, the inner surface was smoothed, and the topside tank 4 was reduced in size by inclining the hatch combing 10.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to the hull structure of a bulk carrier (hereinafter abbreviated as BC), and particularly has a double tank structure in the center of the bottom of the cross section of the hold, a hopper tank on both sides of the bottom, and a top side tank on both lower sides of the upper deck. It is concerned with the improvement of the hull structure of the BC with these lower hopper tanks and upper topside tanks connected by ship side plates.

[0002]

[Prior art]

 As shown in FIG. 5, a conventional bulk carrier (BC) generally has a cross section of a hold A having a double bottom tank 2 structure in the center of the bottom, a hopper tank 3 on both sides of the bottom, and a top side tank 4 on both sides below the upper deck. The lower side hopper tank 3 and the upper top side tank 4 are connected to each other by a single-plate structure. The cargo hold A is separated from the outside by a single steel plate 6. . In the single-plate structure, small bones 7 are provided on the outer shell plate in the vertical direction, and elbow plates 8 are provided above and below the small bones 7.

[0003] Furthermore, in general, a Panamax type BC cargo hold is composed of a hold which is divided into six walls and is divided into seven holds, each having a hatch cover provided for cargo handling. ing. This is due to the fact that the seven vaults were the minimum on the side of the veneer structure in the calculation of inundation determined by the safety of the ship. In addition, in conventional ships, fuel tanks for loading fuel for navigation are usually located on the double bottom tank at the lower part of the cargo hold, on both sides of the ship in the engine room compartment, etc. It has a partitioned structure.

[0004]

[Problems to be solved by the invention]

 However, in the conventional ship cargo hold structure described above, when used for coal transportation, the sulfuric acid solution flowing out of the sulfur generated during coal transportation together with the coal powder into the small bones that flew out to the cargo hold side at the shipboard veneer structure. It is easy to adhere, and there are many cases where the skin, bone, and elbow plate structure are severely worn.

[0005] When the shipboard veneer structure is abnormally worn out, it loses the ability to support the wave load acting on the shipboard which should be originally supported, causing cracks in the shipboard outer plate and causing a large-scale breakage in a chain reaction. Inundation may cause the sinking of BC, which has frequently occurred in recent years.

[0006] Further, in a cargo hold, a smaller number of holds is desired in view of the number of operations for maintenance and cargo handling. However, it has been difficult for the conventional single-panel ship because of its structure. Furthermore, regarding the layout of the fuel tank, if the veneer structure was broken due to an accident such as grounding or sintering, a large amount of heavy fuel oil would flow out, and there was a risk of marine pollution.

[0007] In view of the above, the present invention has focused on the above-mentioned problems, and has found that the ship has a dual structure and a reduced number of cargo holds and a double hull of the fuel tank, which increases the remaining capacity after inundation and eliminates the cause of damage. At the same time, the objective is to reduce the weight of the structure, reduce the number of operations during cargo handling, prevent heavy oil from flowing out when the outer plate is damaged, and enhance environmental pollution prevention.

[0008]

[Means for Solving the Problems]

 That is, the present invention, which meets the above purpose, has a double tank structure in the center of the bottom of the hold section, a hopper tank on both sides of the bottom, and a top side tank on both sides below the upper deck, and a lower hopper tank and an upper top side tank. The cargo hold is divided into six cargo holds by five walls, and the ship side of the cargo hold has a double hull structure. It has a hull structure that is installed inside a heavy hull, smoothes the inner surface, and makes the topside tank smaller by inclining hatch coaming. In addition to the above structure, another important feature is that the fuel tank is a large tank surrounded by a double hull with a depth from the upper deck to the double bottom in front of the engine room.

[0009]

[Action]

 By duplicating the hull structure as described above, the ship side will be strengthened and the cause of damage will be eliminated. In addition, since the sides of the hold are all flat, the accumulation of cargo is eliminated, the work of unloading is eased, and the work of loading and unloading is shortened. In addition, due to the decrease in the number of cargo holds, additional work during cargo handling is reduced, and cargo handling efficiency is increased.

[0010] Furthermore, the double hull of the fuel tank reduces the chance of fuel oil spillage, eliminates the risk of marine pollution, and increases the heat insulation of the conventional double bottom fuel tank. Reduced energy for keeping warm, and associated boiler capacity reduced, CO2 _Two Contribute to the reduction of emissions.

[0011]

[Embodiment of the invention]

 Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an overall structure of a BC according to an example of the present invention, where A is a cargo hold for loading cargo, E is an engine room at the rear, and cargo hold A is a six hold A by a wall 1. It is ₁ ~A ₆ binary split formation.

The feature of the present invention is that it is divided into _six holds A _{1 to} A ₆ , which is a feature of the present invention. Maintenance and simplification of cargo handling operations will be achieved. The use of six warehouses can reduce the area under the raised deck, which has been a dead space, and can recover the ship capacity reduced by the double hull due to the increase in the actual capacity. it can.

FIG. 2 shows an outline of each of the divided holds A _{1 to} A ₆ by the XX section of FIG. 1, and FIG. 4 shows the details thereof. It has a hopper tank 3 on both sides at the bottom and a top side tank 4 on both sides below the upper deck 5, and the lower hopper tank 3 and the top side tank 4 on the upper side are made of double steel plates 6A and 6B. Joined by a hull.

The small bones 7 found in the conventional side plate 6 are provided so as to protrude between the inner and outer steel plates 6A and 6B of the double hull, so that the inner wall of the hull, that is, the inner surface of the inner steel plate 6A is The small bone has a smooth surface without popping out. A hatch 9 is provided above each of the holds A _{1 to} A ₆ , and the hatch combing 10 is inclined to make the topside tank 4 smaller than before.

The double hull of the holds A _{1 to} A ₆ is extremely effective for protecting human lives from damage to the hull and accidents caused by water intrusion. Currently, structural regulations are being strengthened to maintain the remaining capacity of ships even when floods in the hold occur due to large-scale damage, and future ships will be required to meet stricter design standards. Was. Meeting this new international regulation would require a significant increase in steel usage, but this would not improve the ship's cargo handling capabilities. The double-hull construction of the hold satisfies the new international regulations and improves the cargo handling function.

FIG. 3 is a sectional view taken along the line YY of the engine room E in FIG. 1 and shows the arrangement of the fuel tank F. The fuel tank F is located between the upper deck 5 and the double bottom in front of the engine room E. It is configured as a large tank with depth. The fuel tank F is also surrounded by a double hull like the hold described above, so that even in the event of injury or damage, heavy oil is prevented from flowing out and environmental pollution is prevented. Crude oil carriers are required to have a double-hull cargo hold structure to prevent marine pollution, but there is no particular restriction on BC (bulk carrier) fuel tanks. Therefore, the present invention encloses the ship with a double hull structure as described above to improve environmental protection and user functions.

In the present invention, other than the above, and although not particularly essential, various improvements are made, for example, by unifying the types of various pumps in the engine room and unifying spare parts. To improve the maintainability of the hull, and to provide two inspection platforms to facilitate maintenance and inspection of the double hull side part, or to adopt a double structure, this part is used for ballast loading, To improve safe navigation in stormy weather, adopt a large ballast pump, and improve operation efficiency by shortening ballast pouring and draining time. The benefits are being enhanced. These are also not directly, but indirectly enhance the effectiveness of the hull structure of the present invention.

[0019]

[Effect of the invention]

 As described above, the hull structure of the present invention basically has a double bottom tank structure in the center of the bottom of the hold, a hopper tank on both sides of the bottom, a topside tank on both sides below the upper deck, a lower hopper tank and an upper topside tank. In bulk carriers, each of which is connected by a ship side plate, the cargo hold is divided into six holds with five walls, the ship side of the hold is double-structured, and the small bones on its inner wall are placed in a double hull. A double hull with a depth from the upper deck to the double bottom in front of the engine room, with the top side tank being downsized by smoothing the inner surface, tilting the hatch coaming, and in front of the engine room It is a large tank with a structure.By using a double hull structure for the cargo hold, it is possible to eliminate the cause of damage instead of simply increasing the remaining capacity after flooding by reinforcing the structure. root In order to prevent large-scale damage to structural members and achieve an intrinsically safe structure, smooth the sides of the hold to eliminate the accumulation of cargo and significantly ease the manual work of loading cargo. It has a remarkable effect of improving the operational efficiency by shortening the cargo handling work.

In addition, the present invention particularly reduces the structural weight by providing six cargo holds with a double hull, thereby enabling provision of an inexpensive ship and requiring less hatch cover. In addition, the maintenance of the equipment and the simplification of the cargo handling operation can be simplified, and the area under the protruding plate, which had previously been dead space, was reduced due to the use of six warehouses. It has the advantage of being able to recover the volume reduced by the hull, and furthermore, the double hull of the fuel tank and the large size prevent heavy oil from spilling in case of damage to the outer plate, and marine pollution. In addition to being able to enhance prevention, it has better insulation properties than conventional fuel tanks and has the effect of preventing heat damage to luggage. No steelwork costs It is expected to have a remarkable effect of enhancing the functions of the ship at the same cost as increasing the number of ships.

[Brief description of the drawings]

FIG. 1 is an overall schematic view showing an example of a hull structure according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is a schematic cross-sectional view of a hold, in which a left half shows a cross section of a wall and a right half shows a cross section of an intermediate part.

FIG. 5 is a cross-sectional view of a conventional hold, in which a left half is a cross-section of a wall,
The right half shows a sectional view of the middle part.

[Explanation of symbols]

BC Bulk carrier A Cargo hold A _{1 to} A ₆ Each hold E Engine room F Fuel tank 1 Wall, 2 Double bottom tank 3 Hopper tank 4 Top side tank 5 Upper deck 6 Ship side plate 6A, 6B Double steel plate 7 Small bone 8 Elbow plate 9 Hatch 10 Hatch combing

Claims (2)

[Utility model registration claims] 1. A double tank structure in the center of the bottom of the hold section,
In a bulk carrier having a hopper tank on both sides at the bottom and a top side tank on both sides below the upper deck, and a lower hopper tank and an upper top side tank each connected by a ship side plate, a cargo hold is formed by five walls. Divided into two holds, with the hull side of the cargo hold having a double hull structure, small bones on its inner wall provided in the double hull, smoothing the inner surface, and tilting the hatch coaming to create a topside tank. A hull structure of a bulk carrier, characterized in that it is made smaller. 2. The hull structure of a bulk carrier according to claim 1, wherein the fuel tank is a large tank surrounded by a double hull having a depth from the upper deck to the double bottom in front of the engine room.