JP7341627B2 - Ship construction method applying dry dock unfloating tandem construction method - Google Patents

Description

The present invention provides for the construction of a launched vessel and a partially launched vessel at the same time when constructing ships of the same type or different types in the same dry dock, while maintaining the balance of the partially launched vessel when the launched vessel is unloaded. Applying the dry dock unfloating tandem construction method, which can not be stably floated and can be forcibly injected water differently depending on the construction stage of the partially launched vessel without affecting the launching of the partially launched vessel. Concerning ship construction methods.

As is well known, in order to efficiently build large ships, ships are built using the dry dock method. In this method, ship blocks are built inside the dry dock, and seawater flows into the dry dock to float the ship. After that, it will be pulled up to the quay and carried out.
On the other hand, the tandem construction method is being applied, which utilizes the free space in the dry dock to construct launched vessels and partially launched vessels at the same time.

For example, when applying the tandem construction method to a super-large container ship launched and a VLCC (Very Large Crude Oil Carrier) partially launched vessel, the bulkhead of the partially launched vessel is formed when seawater flows into the dry dock. Due to the buoyancy of the cargo tank area, the vessel was buoyed unbalanced toward the stern end, and when the tug vessel was used to lift the launched vessel, the planks supporting the partially launched vessel fell down due to the rotation of the tug vessel's screws, causing the partially launched vessel to float. There is a limitation in that a launching vessel and a partially launching vessel of an ultra-large container ship cannot be constructed at the same time because the launching vessel may be overturned.

Korean Registered Patent Publication No. 10-0796410 is disclosed as a prior art to eliminate such limitations. the stage of constructing the blocks; the stage of installing the main payloads of the main engines, stern and intermediate shafts, stern blocks, lashing bridges or hatch covers on the flooded vessel; and the cargo/hold of the flooded vessel when the launched vessel is refloated. The process includes the steps of allowing water to naturally flow into the ballast and some double-bottomed tanks to flood the ship at the same location, and a step of constructing the flooded ship after the launched ship is towed. After loading, the ship's hull is flooded so that construction can be completed in the same position without the ship moving.

However, when a partially launched vessel is loaded with its main payload, the water flowing in to float the partially launched vessel naturally flows into the cargo/hold ballast and some double-bottomed tanks. submergence, but this is only possible after completing the loading of all major payloads on the partially launched vessel before launching the launched vessel, as shown in Figure 1. There is a problem in that the salvage time of a partially launched vessel is delayed depending on the construction stage of the partially launched vessel, and the partially launched vessel is flooded with water that naturally flows into the dock, that is, seawater, and the hull is damaged by salt and chlorine. There is a possibility of corrosion, and there is a problem that the construction period will be delayed due to the need for preceding or subsequent processes to prevent hull corrosion.

Therefore, it is possible to salvage a launched ship regardless of the construction stage of a partially launched ship, thereby minimizing construction delays and minimizing hull corrosion in preparation for flooding of a partially launched ship. A tandem construction method is required.

Republic of Korea Registered Patent No. 10-0796410

An object of the present invention is to minimize construction delays by salvaging a partially launched vessel regardless of the construction stage of the partially launched vessel, and to minimize hull corrosion in preparation for flooding of a partially launched vessel. The purpose of the present invention is to provide a ship construction method applying the dry dock unfloating tandem construction method.

In order to achieve the above object, the present invention constructs a plurality of similar or different types of ship blocks in one or two rows respectively in the same dry dock, but partially launches ships in the area adjacent to the dock head. a step of carrying out shell construction and carrying out partial construction of the hull of the launched vessel in an area adjacent to the dock gate; a step of forcibly injecting water into the interior of the partially launched vessel via a pump; and a step of opening the dock gate of the dry dock. levitating the launched vessel by inflowing seawater and not refloating the partially launched vessel, carrying out the floated launched vessel to an external quay of the dock gate, and closing the dock gate. a step of draining seawater from the dry dock; and a step of carrying out construction work on the remaining hull portion of the partially launched ship at the same location. provide.

Here, in order to offset the buoyancy of the partially launched vessel and maintain balance with the COG (Center of Gravity), fresh water is pumped into the cargo tank in which the bulkhead of the partially launched vessel is formed through the pump. Alternatively, seawater can be forcibly injected.

At this time, when the deck house and engine casing of the partially launched vessel are mounted, water is forcibly injected into the pair of left and right SCO tanks adjacent to the engine casing, and when the deck house and engine casing of the partially launched vessel are not mounted, Most of the water can be forcibly injected into a pair of left and right SCO tanks adjacent to the engine casing, and the remainder can be forcibly injected into a pair of left and right slop tanks.

Moreover, fresh water or seawater can be forcibly injected into the SCO tank and the slop tank.

Furthermore, when forcibly injecting seawater, the water can be injected after removing salt and chlorine through a seawater desalination device.

In addition, the method may further include the step of carrying out construction work on the hull of a subsequent ship at the unloading position of the launched ship.

According to the present invention, a partially launched vessel is not floated while minimizing hull corrosion by separately forcibly injecting fresh water or seawater, and a partially launched vessel is not floated when a vessel of the same type or a different type is constructed in the same dry dock. While constructing a partially launched vessel and a partially launched vessel at the same time, it is possible to keep the partially launched vessel stable and floating while maintaining balance during the unloading of the launched vessel. It is possible to forcibly inject water into the vessel without affecting the launching of the launched vessel, and the tandem construction method has the effect of shortening the construction period and making it possible to construct large vessels in succession.

This figure exemplifies the flooding method applied to the tandem construction method according to the prior art. 1 is a diagram showing a flowchart of a ship construction method applying a dry dock unfloated tandem construction method according to an embodiment of the present invention. FIG. 3 is a diagram schematically showing a dry dock in which a ship construction method to which the dry dock unfloating tandem construction method of FIG. 2 is applied is realized. FIG. 3 is a diagram illustrating a stern cross-sectional structure of a partially launched vessel to which the dry dock unfloated tandem construction method of FIG. 2 is applied. FIG. 4 is a diagram showing a process flowchart of the unflotted tandem construction method in the dry dock of FIG. 3;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The invention may be implemented in a variety of different forms and is not limited to the embodiments described herein.

Referring to FIG. 2, the ship construction method applying the dry dock non-floating tandem construction method according to the embodiment of the present invention generally includes a stage of carrying out hull construction and hull partial construction (S110), and a forced water injection stage (S120). ), a seawater inflow stage (S130), a launching vessel removal stage (S140), a seawater drainage stage (S150), a residual hull partial construction stage (S160), and a subsequent ship hull partial construction stage. step (S170), and the gist is to enable continuous tandem construction of ships.

Specifically, with reference to FIGS. 2 to 5, a ship construction method to which the dry dock unfloated tandem construction method according to the embodiment of the present invention is applied will be described.

First, in the hull construction and hull partial construction execution stage (S110), as shown in Figures 3 and 5(a), a plurality of ships of the same type or ships of different types are arranged in one or two rows in the same dry dock. Each ship block is constructed, and a partial hull construction for a launched ship is performed in an area adjacent to a dock head, and a partial hull construction for a launched ship is performed in an area adjacent to a dock gate.

Here, the launched ship or partially launched ship is, but is not particularly limited to, a large construction ship such as a VLCC (Very Large Crude Oil Carrier), an ultra-large container ship, an LNG carrier, an LNG propelled ship, or a chemical product carrier. Launched ships with a total length of around 400m (LOA, Length of Overall) and partially launched ships with a total length of around 120m can be launched simultaneously in one or two rows in the same dry dock with a length of 500m or more. Can be built.

For reference, the distance between the dock head and the partially launched vessel and the distance between the dock gate and the launched vessel should be around 5m, and the distance between the partially launched vessel and the launched vessel should be around 10m. Requires.

Subsequently, in the forced water injection step (S120), as shown in FIG. To prevent the bow part of a partially launched vessel from being lifted up by self-buoyancy.

In other words, the bulkheads of a partially launched vessel are designed to offset the buoyancy of the partially launched vessel due to seawater density, which varies depending on water temperature, salinity, and water pressure, and maintain a balance with the COG (Center of Gravity). Fresh water or seawater is forcibly injected into the cargo tank through a pump P to prevent the partially launched vessel from being lifted off the support for preventing blocks from falling in place.

On the other hand, referring to FIG. 4, when the deck house (D/H, Deck House) A and engine casing (engine casing) B of the partially launched vessel are installed during forced water injection, the bow part of the partially launched vessel, In other words, water is forcibly injected into a pair of left and right SCO (Side Crude Oil) tanks (SCO TK (P), (S)) adjacent to engine casing B, but each is 8,000 tons based on VLCC (Very Large Crude Oil Carrier). While preventing the bow of a partially launched vessel from being buoyed by injecting water at the front and rear, balance the COG that is biased toward the rear end of the stern to prevent the stern from being partially buoyed due to an unbalanced tilting of the front and rear. . For example, No. 5 8000 tons of water was poured into SCO TK (P), and No. 5 SCO TK(S) can be injected with 7,950 tons of water for a total of 15,950 tons.

Alternatively, when deckhouse A and engine casing B of a partially launched vessel are not installed, the COG is less biased toward the rear end of the stern than when installed, and most of the COG is forced into the pair of left and right SCO tanks adjacent to engine casing B. Water is injected, and the remaining water is forcibly injected into the pair of left and right slop tanks (SLOP TK (P), (S)). By injecting around 800 tons of water into each slop tank to prevent the stern from floating, we balanced the COG, which is relatively small toward the rear end of the stern, and the stern was tilted unbalanced, resulting in partial buoyancy. Try not to. For example, No. 5 Inject 7,100 tons of water into each of SCO TK (P, S), 860 tons of main water into SLOP TK (P), and 750 tons into SLOP TK (S), for a total of 15,810 tons of water. I can do it.

Here, fresh water or seawater can be forcibly injected into the SCO tank and slop tank via pump P, but when forcibly injecting seawater, seawater should be used to minimize corrosion of the hull due to salt and chlorine. Water can also be injected after salt and chlorine have been removed via a desalination device.

For this reason, depending on the construction stage of the partially launched vessel, fresh water or seawater is forcibly injected using different methods to keep the partially launched vessel afloat stably while maintaining its balance. Since it does not affect water, construction delays can be kept to a minimum.

For reference, pump P is shown as being placed in a dry dock, but it can also be installed on a partially launched vessel for forced water injection, and slop tanks can be formed after cleaning various tanks. A tank for storing a mixture of oil and seawater, or an oily mixture of waste oil flowing out from an engine room, and is arranged for the purpose of preventing ocean pollution by oil and reducing cargo oil loss.

Subsequently, in the seawater inflow step (S130), as shown in FIG. 5(b), the dock gate of the dry dock is opened to allow seawater to flow in and float the launched vessel, keeping the partially launched vessel in a fixed position. Do not levitate.

Subsequently, in the step of carrying out the launched vessel (S140), as shown in FIGS. 3 and 5(c), the launched vessel that has floated is pulled up to the external quay of the dock gate by a tug and carried out.
Subsequently, in the seawater draining step (S150), the dock gate is closed and seawater is drained from the dry dock.

Subsequently, in the remaining hull partial construction execution step (S160), as shown in Figure 5(d), the fresh water or seawater that was forcibly injected into the partially launched vessel is drained, and the partially launched vessel is refilled at the same location where it was flooded. Construction of the remaining hull will be carried out to construct the launching vessel.

Subsequently, in the subsequent vessel hull partial construction execution stage (S170), as shown in FIG. 5(d), the hull partial construction of the subsequent vessel is performed at the unloading position of the launched vessel.

Therefore, by using the structure of the ship construction method applying the dry dock unfloating tandem construction method described above, a partially launched ship on which the main cargo is loaded can be built using naturally flowing seawater to float the launched ship using the conventional submersion method. In contrast to flooding, it is possible to minimize hull corrosion by separately forcibly injecting fresh water or seawater without refloating partially launched ships, and to proceed when constructing ships of the same or different types in the same dry dock. While constructing a water vessel and a partially launched vessel at the same time, it is possible to keep the partially launched vessel afloat stably while keeping the balance when the launched vessel is carried out, and it is also possible to keep the partially launched vessel afloat in a stable manner while maintaining the balance at the time of transporting the launched vessel. It is possible to forcibly inject water in different ways without affecting the launching of launched ships, and by using the tandem construction method, large-scale construction ships can be constructed continuously while shortening the construction period.

The invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments that are equivalent to the present invention are possible by those having ordinary knowledge in the technical field to which the present invention pertains. Therefore, the true protection scope of the present invention is determined by the following claims.

Claims (6)

A plurality of ship blocks of the same type or different types are constructed in one or two rows within the same dry dock, but hull construction for partially launched ships is performed in the area adjacent to the dock head, and hull construction for partially launched ships is performed in the area adjacent to the dock gate. The stage of carrying out partial construction work on the hull of
forcibly injecting water into the interior of the partially launched vessel via a pump;
opening a dock gate of the dry dock to allow seawater to flow in to float the launched vessel, but not to float the partially launched vessel;
carrying the floated launched vessel to an external quay of the dock gate;
closing the dock gate to drain seawater from the dry dock;
performing residual hull partial construction on the partially launched vessel at the same location ;
In order to offset the buoyancy of the partially launched vessel and maintain a balance with the COG (Center of Gravity), fresh water or seawater is pumped into the cargo tank of the partially launched vessel, in which the bulkhead is formed, through the pump. Forced water injection,
When installing the deck house and engine casing of the partially launched vessel, water is forcibly injected into a pair of left and right SCO (Side Crude Oil) tanks adjacent to the engine casing.
A ship construction method that applies the dry dock unfloating tandem construction method. A plurality of ship blocks of the same type or different types are constructed in one or two rows within the same dry dock, but hull construction for partially launched ships is performed in the area adjacent to the dock head, and hull construction for partially launched ships is performed in the area adjacent to the dock gate. The stage of carrying out partial construction work on the hull of
forcibly injecting water into the interior of the partially launched vessel via a pump;
opening a dock gate of the dry dock to allow seawater to flow in to float the launched vessel, but not to float the partially launched vessel;
carrying the floated launched vessel to an external quay of the dock gate;
closing the dock gate to drain seawater from the dry dock;
performing residual hull partial construction on the partially launched vessel at the same location ;
In order to offset the buoyancy of the partially launched vessel and maintain a balance with the COG (Center of Gravity), fresh water or seawater is pumped into the cargo tank of the partially launched vessel, in which the bulkhead is formed, through the pump. Forced water injection,
When the deck house and engine casing of the partially launched vessel are not installed, most of the water is forcibly injected into a pair of left and right SCO tanks adjacent to the engine casing, and the remainder is forcibly injected into a pair of left and right slop tanks, respectively.
A ship construction method that applies the dry dock unfloating tandem construction method. A ship construction method applying the dry dock non-floating tandem construction method according to claim 1, wherein fresh water or seawater is forcibly injected into the SCO tank . A ship construction method applying the dry dock non-floating tandem construction method according to claim 2 , wherein fresh water or seawater is forcibly injected into the SCO tank and the slop tank. When forcibly injecting seawater, salt and chlorine are removed through a seawater desalination device before water is injected.
A ship construction method applying the dry dock unfloated tandem construction method according to claim 3 or 4 . The method further includes the step of carrying out construction work on the hull of a subsequent ship at the unloading position of the launched ship.
A ship construction method applying the dry dock non-floating tandem construction method according to claim 1 or 2 .

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