KR20120066225A - Vessels including watertight device to prevent flooding of lower cargo hold - Google Patents

Abstract

PURPOSE: A ship having a watertight device for preventing flooding of a lower cargo hold is provided to satisfy damage restoring performance of new regulations regardless of data or special devices, and to increase flexibility of an opening part and a structural reinforcement. CONSTITUTION: A ship having a watertight device(1) for preventing flooding of a lower cargo hold comprises a fixed or movable lamp(2), a lamp cover(3), a control stand(4), a hinge(5), a cylinder(6), a rubber packing(7), and clips(8). The fixed or movable lamp is installed under a bulkhead deck. The watertight device is installed in the fixed or movable lamp arranged throughout at least two watertight sections. The lamp cover is installed in the bulkhead to cover the fixed or movable lamp. The control stand controls ascending and descending of the watertight device. The hinge is installed at the bottom of the watertight device and rotates around a shaft in case that the watertight device is driven by a motor. The cylinder stably ascends and descends the watertight device in case that the watertight device rotates around hinges(6a,6b).

Description

Vessels Including Watertight Device to prevent flooding of lower cargo hold}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ship having a lower cargo hold immersion watertight device (Watertight Device), in particular a watertight between a lamp cover of a fixed ramp or a movable ramp in a vessel. A device is installed to prevent flooding of the Lower Cargo Hold below the bulkhead deck, and also to pass between internal deck hold on Ro-Ro (roll-on / roll-off) ships. Improving damage restoration performance by separating the lamp space, which is the path, from the cargo hold with a watertight door. The present invention relates to a ship having a lower cargo hold inundation preventing watertight device capable of increasing payload.

New Damage Stability provisions of the ship (Safety of Life At Sea (SOLAS) Chap. 2-1) have been applied since January 1, 2009, resulting in damage across the ship. Flooding by) should be considered. For ships with lower cargo hold under bulkhead deck, when fixed lamps are damaged under bulkhead deck for vehicle loading, progressive flooding will occur and this will not satisfy the damage stability. There is a case.

If a fixed lamp installed in the lower cargo hold or a movable lamp in which the lamp can be moved according to the height or size of the vehicle is disposed in the B / 5 line, it is treated as not damaged in the conventional damage restoration performance regulation. However, the application of the revised impairment performance regulations increases the impairment range and damages fixed or mobile lamps, resulting in the inability of the imperfections to be restored due to flooding of the lower cargo hold.

On the other hand, a typical Ro-Ro ship consists of several deck cargo holds, and has been subjected to strict damage restoration performance in accordance with the International Convention for the Safety of Life at Sea (SOLAS 1974). You have to have verification. The SOLAS Subdivision and Damage Stability Regulation aims to demonstrate a certain level of viability, assuming probabilistic damage situations. Based on the watertight division of the ship, any damage scenarios are assumed in accordance with regulations, which generally assume more than 1,000 possible numbers. The probability of occurrence of individual damage scenarios × survival probability = Individual Attained Index, and the overall ship viability is the sum of the individual acquisition indices. Therefore, the loading condition should be set in consideration of damage / intact recovery performance, and in general, damage recovery performance determines the actual payload since damage recovery performance is a criterion for a greater loading condition. It can be called an argument.

Ro-Ro ships are equipped with a stern ramp for loading and unloading of cargo at the port and the movement of cargo to each deck cargo hold from the stern ramp through the engine room area. This is done.

In the case of a ship having a downward ramp disposed in a section overlapping with a conventional engine room, when the engine room compartment is flooded, the deck hold of the bow is also flooded in succession. Therefore, such a vessel has a structure that is very vulnerable to the damage situation of the engine compartment section. This causes the loading condition to be poor and requires other means to compensate for the damage recovery performance. In addition, in order to improve damage restoration performance, structural strength reinforcement considering the arrangement of openings (Air Ventilation, Door, etc.) and waterhead during immersion is generally considered.

The present invention is conceived under the above-mentioned background, by installing a watertight device in a fixed or mobile lamp that is arranged over two or more watertight subdivisions so that the lower cargo hold is not gradually flooded due to damage to the lamp Therefore, the object of the present invention is to provide a ship with a lower cargo hold inundation preventing watertight device capable of satisfying the damage restoration performance of the new regulation.

Another object of the present invention is to improve the damage recovery performance by isolating the lamp space which is the passage path between the deck cargo hold inside the ro-ro ship from the cargo hold by watertight doors An object of the present invention is to provide a vessel with a watertight device capable of increasing the effective load.

The present invention is a ship having a watertight device according to an embodiment of the present invention in order to achieve the above object, a ship having a watertight device, a fixed or mobile vehicle passageway installed below the bulkhead deck (bulkhead deck) Lamp 2; A watertight device (1) installed in a fixed or movable lamp (2) disposed over two or more watertight sections; A lamp cover (3) which is a cover installed on the bulkhead deck and covering the fixed or movable lamp; A control stand (4) for controlling the rise and fall of the watertight device (1); A hinge 5 installed at a lower end of the watertight device 1 and capable of rotating about an axis when the watertight device 1 is driven by a motor; A cylinder 6 for stably raising and lowering the watertight device 1 when the watertight device 1 rotates about the hinges 6a and 6b; Rubber packing (7) to closely block the intrusion of seawater into the cargo hold; And a clip (8) for folding the watertight device (1) to be inserted into the hole (9) installed in the fixed or movable lamp to keep the watertight device (1) fixed. Present a ship with a watertight device.

The present invention is a ship having a watertight device according to another embodiment of the present invention in order to achieve the above object, a ship having a watertight device, as a structure connected by a hinge to bridge the role of docks when docking the harbor A stern lamp 10 which is the main path for loading and unloading; An internal ramp 20 which is a ramp that serves as a connection passage between deck decks having different heights in a Ro-Ro ship; An engine room 30 with compartments for installing the main engines, auxiliary engines, and bogies; A hinged watertight door 40 which is closed at the end of the inner lamp 20 so that the deck cargo hold to which the lamp is connected is not damaged when the engine room length section is flooded; Lower cargo hold characterized in that it comprises a tunnel side partition wall 50 so as to block the partition wall from the bottom of the deck cargo hold to the ceiling on both sides of the hinge watertight door 40 so that the lamp space is isolated from the cargo hold. A ship is provided with a watertight device for preventing flooding.

According to the present invention, the damage restoration performance of the new regulation can be satisfied without considering the specifications of the ship or a special device.

In addition, it is possible to increase the actual effective load of cargo in the loading condition, and to increase the flexibility of reinforcing the opening and structural strength.

1A and 1B show an arrangement side view and a detailed side view of a watertight device installed in a ship according to an embodiment of the present invention, respectively.
2 shows a schematic side view and a plan view of a ship with a watertight device for ships according to another embodiment of the invention.
3 is a view illustrating in detail the inner lamp portion of FIG.

Hereinafter, a watertight apparatus for a vessel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The same and similar parts are designated by the same and similar reference numerals throughout the drawings.

1A and 1B show an arrangement side view and a detailed side view of a watertight device installed in a ship according to an embodiment of the present invention, respectively.

1A and 1B, the ship is a ship having a lower cargo hold under the bulkhead deck. The watertight device 1 in the dotted dotted portion A in FIG. 1A is located on tech 2 and blocks the progressive flooding to tech 2. The watertight device 1 is installed in a fixed ramp or a movable ramp arranged over two or more watertight subdivisions. The partition deck 3 acts as deck 4. The control stand 4 controls the raising and lowering of the watertight device 1 as a local console.

In FIG. 1B, the watertight apparatus 1 is installed in a fixed or movable lamp which is arranged over two or more watertight sections as described above. The fixed or movable ramp 2 is a bulkhead deck, that is, a vehicle moving passage installed under the ramp cover 3. In addition, the lamp cover 3 is a cover installed on the partition deck and covering the fixed or movable lamp. The control stand 4, i.e., the local console, is a device that controls the raising and lowering of the watertight device 1. The hinge 5 is installed at the lower end of the watertight device 1, and may rotate about the hinge 5 when the watertight device 1 is driven by a motor (not shown). The cylinder 6 serves to raise and lower the watertight device 1 stably when the watertight device 1 rotates about the hinges 6a and 6b. The cylinder can be a hydraulic or pneumatic cylinder. The rubber packing 7 closely blocks the intrusion of seawater into the cargo hold. The watertight device 1 shown in the upright state is when the ship is in operation, and when the ship loads the vehicle, the watertight device 1 is installed side by side with a fixed or movable lamp. The clip 8 is folded and inserted into the hole 9 installed in the fixed or movable lamp so that the watertight device 1 is held to hold the watertight device 1 fixed. In the drawing, B is a seat where the hinge is installed, and the lamp cover is connected to the bulkhead deck by a hinge. The material of the watertight apparatus 1 is generally made of steel, and any material can be used as long as it maintains the same strength.

When the watertight device is installed in the fixed ramp, damage restoration calculation results show that the ATTAINED INDEX (A) is increased by 0.04 as shown below.

<Before Installing Watertight Device>

<After installing the watertight device>

2 shows a schematic side view and a plan view of a ship with a watertight device for ships according to another embodiment of the invention.

As shown in the figure, the vessel has a stern ramp 10, an internal ramp 20, an engine room 30, a hinged watertight door 40 and a tunnel side bulkhead. 50).

The stern lamp 10 is a hinge-connected structure and acts as a bridge to the pier when docking the port, and thus becomes a main path for loading and unloading cargo. The internal ramp 20 is a ramp that serves as a connecting passage between deck decks having different heights in a ro-ro ship. In the present invention, the internal ramp 20 is disposed in a section overlapping the engine room. Explaining. The engine room 30 is a compartment for installing a main engine, an auxiliary engine, and a bogie. The engine room of a ship has a complex arrangement of equipment constituting various systems for operation and numerous piping connecting them. The hinge watertight door 40 installs a watertight door that opens with an upward hinge at the end of the lamp so that the deck cargo hold to which the lamp is connected is not damaged when the engine room length is flooded. The tunnel side partition wall 50 is installed on both sides of the hinge watertight door 40 to block the partition wall from the bottom of the deck cargo hold to the ceiling so that the lamp space is isolated from the cargo hold.

3 is a view illustrating in detail the inner lamp portion of FIG.

As shown in the figure, the internal ramp is divided into an engine room section and a card deck section. Watertight cover 60 is installed on the third deck 70 is made of watertight. In the drawing, reference numeral 80 is number 2 deck. The hinged watertight door 40 is a watertight door that opens upwards, inwards upwards, at the end of the lamp 20 as described above. By opening the hinge watertight door 40 inwardly open and close, it is possible to load more cargo in the cargo hold of deck two.

If a downward internal ramp from the stern ramp, connected to the cargo hold downstairs in the direction of the bow, overlaps the engine room, the internal ramp is watertight isolated from the cargo hold downstairs. In the case of separate watertight space, an example of a calculation verification result of damage resilience is as follows.

Case .1 The results of calculation of damage resilience verification according to SOLAS Subdivision and Damage Stability (SDS) when the internal ramp is not isolated from the cargo hold below are as follows.

From the above, damage restoration performance was confirmed, which was about 5.9% less than the SDS requirement of 67.3%.

Case .2 In case 1 above, the case where the internal ramp is changed to a separate watertight space is as follows. The result of the damage restoration verification calculation according to the SOLAS Subdivision and Damage Stability (SDS) is as follows.

From the above, the satisfaction result exceeded the required value of 67.3% by about 3.5%. (A significant improvement of about 9.4%)

In the above calculation result,

Subdivision length: The maximum projection length of a ship, measured at or below deck, which limits the ship's vertical submersion range at maximum full draft.

Required Subdivision Index: An index of resilience for setting the minimum partition criteria according to the relevant regulations (SOLAS, 1974) as the required partition index. The R value is calculated as 1-128 / (Subdivision Length + 152).

Attained Subdivision Index: As the arrival compartment index, the individual arrival compartment index is calculated as Pi x Si. (Pi: Probability of the damage scenario occurring, Si: Probability of the ship surviving the damage scenario). The total reach segment index value is 0.2 X Al (total reach segment index in Lightest subdivision draft) + 0.4 x Ap (total reach segment index in Partial subdivision draft) + 0.4 x As (total segment index in Deepest subdivision draft) Is calculated.

INIT (Initial Condition): The initial loading condition refers to the reference operating condition for reviewing damage resilience, which includes the Lightest / Partial / Deepest subdivision drafts listed below.

Lightest Subdivision Draft (DL): The operating draft corresponding to light estimated load and associated tank loading, but also includes the ballast water required for stability and / or locking. Passenger ships should include the capacity of passengers and crew on board.

DP (Partial Subdivision Draft): 60% of the difference between the light flight draught and the maximum compartment full draft plus the light flight draught

Deepest Subdivision Draft (DS): Repair of the ship's full draft

T (Draft): The draft, or draft, is the vertical distance from the keel ship at the center of the ship to the draft line in its compartment.

Transverse Metacentric height (GM): Metacenter (the point where the hull centerline meets a new subcenter when the ship is inclined at a small angle) and the vertical height to the ship's center of gravity, which is a measure of the ship's resilience.

A / R: Attained Subdivision Index / Required Subdivision Index

A: Attained Subdivision Index

WCOEF (Weight Coefficient): A weight (20% / 40% / 40%) value among the contents described in the reach partition index, which is a weighting factor applied to each of three initial loading states.

According to the present invention, the damage restoration performance of the new regulation can be satisfied without considering the specifications of the ship or a special device.

In addition, it is possible to increase the actual effective load of cargo in the loading condition, and to increase the flexibility of reinforcing the opening and structural strength.

So far, a vessel having a lower cargo hold inundation preventing watertight apparatus according to an embodiment of the present invention has been described with reference to the accompanying drawings, but this is for illustrative purposes and is not intended to limit the present invention to the scope of the present invention. Is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention.

1: watertight device 2: fixed or removable lamp
3: bulkhead deck 4: control stand
5: hinge 6: cylinder
6a, 6b: hinge 7: rubber packing
8: Clip 9: Home
10: Stern Ramp 20: Internal Ramp
30: Engine Room
40: Hinged Watertight Door
50: tunnel side partition 60: watertight cover
70: deck 3 80: deck 2

Claims (8)

A ship equipped with a watertight device for preventing lower cargo hold flooding,
A fixed or movable ramp 2 that is a vehicle moving passage installed below the bulkhead deck;
A watertight device (1) installed in a fixed or movable lamp (2) disposed over two or more watertight sections;
A lamp cover (3) which is a cover installed on the bulkhead deck and covering the fixed or movable lamp;
A control stand (4) for controlling the rise and fall of the watertight device (1);
A hinge 5 installed at a lower end of the watertight device 1 and capable of rotating about an axis when the watertight device 1 is driven by a motor;
A cylinder 6 for stably raising and lowering the watertight device 1 when the watertight device 1 rotates about the hinges 6a and 6b;
Rubber packing (7) to closely block the intrusion of seawater into the cargo hold; And
Lower cargo hold immersion prevention watertightness, characterized in that the watertight device 1 includes a clip 8 that is folded and inserted into a hole 9 installed in a fixed or movable lamp to hold the watertight device 1 fixed. Vessel with device. The method according to claim 1,
The lamp cover (3) is a vessel having a lower cargo hold immersion prevention watertight device, characterized in that the hinge is connected to the other lamp cover. The method according to claim 1,
The watertight device 1 is erected when the ship is in operation, and the watertight device 1 is in parallel with the fixed or movable ramp 2 when the ship loads the vehicle. Vessel with watertight prevention device. The method according to claim 1,
The vessel is provided with a lower cargo hold inundation preventing watertight device, characterized in that the vessel having a lower cargo hold on the bottom of the bulkhead deck. The method according to claim 1,
The cylinder (6) is a ship having a lower cargo hold immersion watertight device, characterized in that the hydraulic or pneumatic cylinder. The method according to claim 1 or 3,
The material of the watertight device (1) is a ship with a lower cargo hold immersion prevention watertight device, characterized in that generally made of steel. A ship equipped with a watertight device for preventing lower cargo hold flooding,
A stern lamp 10 which is a hinged structure and serves as a bridge to the pier when docking the port, and serves as a main path for loading and unloading cargo;
Internal ramps 20 that are ramps that serve as connecting passages between deck decks having different heights;
An engine room 30 with compartments for installing the main engines, auxiliary engines, and bogies;
A hinged watertight door 40 which opens and closes at an end of the inner lamp 20 so as not to damage the deck cargo hold to which the lamp is connected when the engine room length section is flooded;
Lower cargo hold characterized in that it comprises a tunnel side partition wall 50 so as to block the partition wall from the bottom of the deck cargo hold to the ceiling on both sides of the hinge watertight door 40 so that the lamp space is isolated from the cargo hold. Vessel equipped with watertight devices to prevent flooding. The method of claim 7,
The hinge watertight door is a vessel having a lower cargo hold inundation preventing watertight device, characterized in that the watertight door is opened by an upward hinge.

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