CN114787031B - Ship construction process suitable for dry dock non-floating type serial connection process - Google Patents

Abstract

The present invention provides a ship construction process suitable for dry dock non-floating series process, which includes: building multiple ship segments of the same type or different types in one row or two rows in the same dry dock, adjacent at the dock head. area to perform the hull engineering of the partially launched ship, and perform the steps of the hull partial engineering of the launched ship in the area adjacent to the dock door; the step of forcibly injecting water into the interior of the partially launched ship through a pump; and the step of opening the dock door of the dry dock. The step of allowing seawater to flow in, thereby making the launch vessel float and preventing the partially launched vessel from floating; the step of moving the floated launch vessel out to the external shore wall of the dock door; by closing the dock and the step of performing work on the remaining hull portion of the partially launched vessel at the same location.

Description

Shipbuilding technology suitable for dry dock non-floating tandem technology

Technical field

The present invention relates to a method that when building ships of the same type or different types in the same dry dock, it is not only possible to build launched ships and partially launched ships at the same time, but also can maintain the balance of the partially launched ships when moving out the launched ships. A shipbuilding process suitable for the dry dock non-floating tandem process that stably ensures that it will not float and can prevent the impact on the launch of the launched ship by performing different degrees of forced water injection according to the construction steps of the partially launched ship.

Background technique

It is known that in order to efficiently build large ships, dry docking is used to build ships, in which sections of the ship are built and the ship is floated by introducing seawater into the dry dock so that it can be removed after being lifted to the quay wall.

In addition, a tandem process can be applied that utilizes the available space within the dry dock to simultaneously build launched and partially launched vessels.

For example, when the tandem process is applied to the launch of a very large container ship and the partial launch of a very large crude oil carrier (VLCC), when seawater is introduced into the dry dock, a tank will be formed in the partially launched ship. The buoyancy of the cargo hold area of the wall causes the ship to tilt and float unevenly toward the stern end side. As a result, when the ship is lifted and launched by a tugboat, the propeller of the tugboat rotates, which may cause the support supporting the partially launched ship to tip over and further cause Since the partially launched ship is tipped over, there is a problem that it is impossible to build both the launched ship of the ultra-large container ship and the partially launched ship at the same time.

As a prior art for solving the above problems, Korean Registered Patent Publication No. 10-0796410 is disclosed, which is applicable to the submersion process in the traditional tandem construction process, including: building ship segments by the tandem construction process in the dock The steps of installing the main engine, tail shaft, intermediate shaft, stern section, lashing bridge or hatch cover and other main cargo in the submerged ship; the steps of naturally introducing water into the submerged ship when floating and launching the ship. The steps of submerging the ship to the same position in the cargo ballast tank and part of the double bottom tanks; and the steps of constructing the submerged ship after towing the launched ship; this can be achieved by submerging the hull after loading all cargo The construction is completed in the same location without moving the hull.

However, when the main cargo is loaded onto the partially launched ship, the water flowing in to float the launched ship naturally flows into the cargo ballast tank and part of the double bottom tanks to submerge the partially launched ship, as shown in the figure. As shown in 1, the launched ship can only be launched after all the main loads are loaded on the partially launched ship. Therefore, even in the state where the construction of the launched ship has been completed, the ship can be launched according to the construction steps of the partially launched ship. The lifting time may be delayed, and the water that naturally flows into the dock, that is, seawater, will cause partial submersion of the launched ship, which may cause hull corrosion due to salt and chlorine. Therefore, preparatory works to prevent hull corrosion are required. Or follow-up projects and ultimately lead to delays in the construction period to the problem.

To this end, there is a need for an improved tandem process that can lift a partially launched vessel independently of the construction steps of the partially launched vessel, thereby minimizing construction delays and minimizing hull corrosion caused by flooding of the partially launched vessel.

Contents of the invention

The technical problem to be solved by the idea of the present invention is to provide a system that can lift the partially launched vessel regardless of the construction steps of the partially launched vessel, thereby minimizing the delay in the construction period and minimizing the hull corrosion caused by the immersion of the partially launched vessel. A shipbuilding process suitable for dry dock non-floating tandem processes.

In order to achieve the above objectives, the present invention provides a ship construction process suitable for dry dock non-floating tandem process, including: building multiple ships of the same type or different types in one row or two rows in the same dry dock. Segmentally, perform the steps of partially launching the ship's hull in the area adjacent to the dock head, and perform the steps of partially launching the ship's hull in the area adjacent to the dock door; the steps of forcibly injecting water into the interior of the partially launched ship through a pump; by opening The step of using the dock door of the dry dock to allow seawater to flow in, thereby floating the launched ship and preventing the partially launched ship from floating; moving the floated launched ship out to the external shore wall of the dock door the steps of; the step of discharging seawater from the dry dock by closing the dock door; and the steps of performing work on the remaining hull portion of the partially launched vessel at the same location.

In order to offset the buoyancy of the partially launched ship and maintain equilibrium with the center of gravity (COG), fresh water or seawater can be forcibly injected into the cargo hold with a bulkhead in the partially launched ship through a pump.

At this time, when the deckhouse and engine room shed of the partially launched ship are mounted, water can be forced to be injected into the left and right crude oil (SCO) tanks adjacent to the engine room shed respectively, and when the partially launched ship is not mounted When the deckhouse and engine room shed are installed, most of the water can be forcibly injected into the left and right pair of crude oil (SCO) tanks adjacent to the engine room shed, and the remaining water can be forcibly injected into the left and right pair of oil and sewage tanks respectively.

In addition, the side crude oil (SCO) tank and the oily water tank may be forced injected with fresh water or seawater.

In addition, when seawater is forcedly injected, water can be injected after removing salt and chlorine through a seawater desalination device.

In addition, it may also include the step of performing a hull part project of the subsequent ship at the launching ship removal position.

In the present invention, it is possible to minimize hull corrosion while preventing partially launched ships from floating by separately forcibly injecting fresh water or seawater, and when building the same type or different types of ships in the same dry dock, not only It is possible to build a launched ship and a partially launched ship at the same time, and it is also possible to stably ensure that the partially launched ship does not float while maintaining the equilibrium state of the partially launched ship when moving the launched ship out, and it is possible to perform various degrees of construction according to the construction steps of the partially launched ship. Forced water injection prevents any impact on the launching of ships, and the tandem process enables the continuous construction of large-scale construction ships while shortening the construction period.

Description of drawings

Figure 1 illustrates a water immersion process suitable for use in tandem construction processes based on the prior art.

FIG. 2 is a diagram illustrating a sequence diagram of a shipbuilding process applicable to the dry dock non-floating tandem process according to the embodiment of the present invention.

FIG. 3 is a schematic illustration of a dry dock that implements the shipbuilding process suitable for the dry dock non-floating tandem process in FIG. 2 .

Figure 4 illustrates the stern cross-sectional structure of the partially launched ship in Figure 2 that is suitable for the shipbuilding process of the dry dock non-floating tandem process.

Figure 5 illustrates the engineering flow diagram of the non-floating tandem process in the dry dock in Figure 3 respectively.

Detailed ways

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those with general knowledge in the technical field to which the present invention belongs can easily implement the present invention. The present invention can be implemented in many different forms and is not limited to the embodiments described here.

Referring to Figure 2, the ship construction process suitable for the dry dock non-floating tandem process according to the embodiment of the present invention generally includes the hull engineering and hull part engineering execution steps S110, the forced water injection step S120, the seawater inflow step S130, and the removal of the launched ship. The gist of step S140, seawater drainage step S150, remaining hull part project execution step S160, and subsequent ship hull part project execution step S170 is to achieve continuous series construction of the ship.

Next, the ship building process applicable to the dry dock non-floating tandem process according to the embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5 .

First, in the hull engineering and hull part engineering execution step S110, as shown in Figure 3 and (a) in Figure 5, multiple ships of the same type or ship sections of different types are built in one row or two rows in the same dry dock, the hull engineering of some launched ships is performed in the area adjacent to the dock head, and the hull part engineering of the launched ships is performed in the area adjacent to the dock gate.

Among them, launched ships or partially launched ships are not subject to special restrictions, and can be such as very large crude oil carriers (VLCC; Very Large Crude oil Carrier), very large container ships, liquefied natural gas (LNG) carriers, liquefied natural gas (LNG) ) Large-scale construction ships such as power ships or chemical product carriers can be built simultaneously in one or two rows in the same dry dock with a length of more than 500m. Launched ships with a total length (LOA; Length Of Overall) of about 400m and full-length It is a partial launch vessel of about 120m.

As a reference, the distance between the dock head and the partially launched ship and the distance between the dock door and the launched ship need to be maintained at about 5m, while the distance between the partially launched ship and the launched ship needs to be maintained at about 10m.

Next, in the forced water filling step S120, as shown in Figure 3, the pump P can be used to forcibly fill the interior of the partially launched ship with water, thereby ensuring that when seawater flows into the dock, the bow of the partially launched ship will not Floats due to its own buoyancy.

That is, in order to offset the buoyancy of the partially launched ship under the density of seawater that changes depending on the water temperature, salinity, and water pressure, and to maintain equilibrium with the center of gravity (COG), the tank ( A cargo tank is a cargo tank that is forced into a cargo tank with fresh water or sea water, thereby ensuring that the partially launched ship remains in place and prevents it from floating from the supports used to prevent the ship from tipping over in sections.

In addition, referring to Figure 4, during the forced water filling, when the deck house (D/H; Deck House) A and engine casing B of the partially launched ship are mounted, the bow part of the partially launched ship is installed, respectively. The adjacent left and right crude oil (SCO) tanks (SCO TK (P), (S)) of the engine room shed B are forced to be filled with water. Taking the very large crude oil carrier (VLCC) as an example, it can be completed by injecting about 8,000 tons of water respectively. It prevents the bow of a partially launched ship from floating while maintaining balance with the Center of Gravity (COG) where the center of gravity is inclined toward the rear end of the stern, thereby avoiding partial floating caused by the uneven tilt of the front and rear of the stern. For example, 8,000 tons of water can be injected into No. 5 SCO TK (P) and 7,950 tons can be injected into No. 5 SCO TK (S), resulting in a total water injection of 15,950 tons.

Alternatively, when the deckhouse A and the engine room shed B are not equipped with a partially launched ship, the center of gravity (COG) is less inclined to the rear end of the stern than when the ship is mounted, so they are adjacent to the engine room shed B. The left and right pair of crude oil (SCO) tanks are forced to inject most of the water, and the left and right pairs of oil sewage tanks (SLOP TK (P), (S)) are forced to inject the remaining water to the very large crude oil carrier (VLCC). For example, by injecting about 7,000 tons of water into a pair of left and right SCOs respectively and about 800 tons of water into a pair of left and right oil sewage tanks, it is possible to prevent the stern from floating while maintaining a center of gravity that is less inclined to the rear end of the stern. (COG) balance to avoid partial floating caused by uneven tilting of the front and rear of the stern. For example, 7100 tons of water can be injected into No. 5SCO TK(P,S), 860 tons of water can be injected into SLOP TK(P), and 750 tons can be injected into SLOP TK(S), so that a total of 15810 tons of water can be injected.

Among them, fresh water or seawater can be forcibly injected into the side crude oil (SCO) tank and slop tank through pump P. When seawater is forcibly injected, in order to minimize the hull corrosion caused by salt and chlorine, it can be removed through a seawater desalination device. Add water after salt and chlorine.

To this end, fresh water or seawater can be forced to be injected in different ways according to the construction steps of the partially launched ship, thereby stably ensuring that the partially launched ship does not float while maintaining the equilibrium state of the partially launched ship, and because there will be no impact on the launch of the partially launched ship. Minimize delays and impact.

For reference, the diagram shows the case where the pump P is installed in a dry dock, but it can also be installed on a partially launched ship to force water injection. The oil sewage tank is used to store the oil and seawater formed after cleaning various compartments. A compartment containing a mixture or an oily mixture of waste oil flowing out of the engine room, configured to prevent marine pollution due to oil pollution and to reduce the loss of cargo.

Furthermore, in the seawater inflow step S130, as shown in (b) of Figure 5, seawater can flow in by opening the dock door of the dry dock and float the launched ships, while some of the launched ships will remain unfloated at their original positions. state.

Furthermore, in the launching vessel unloading step S140, as shown in (c) in FIG. 3 and FIG. 5 , the floating launching vessel is lifted to the shore wall outside the dock door by the tugboat.

Furthermore, in the seawater drainage step S150, seawater is discharged from the dry dock by closing the dock door.

Furthermore, in the remaining hull part work execution step S160, as shown in (d) in FIG. 5, the fresh water or seawater forcibly injected into the partially launched ship is discharged, and the remaining work on the partially launched ship is performed at the same position where the water is immersed. Partial engineering of the hull to complete the construction of the launched ship.

Furthermore, in the subsequent ship hull part process execution step S170, as shown in (d) in FIG. 5, the hull part process of the subsequent ship is executed at the carry-out position of the launched ship.

Thereby, through the structure of the shipbuilding process that applies the dry dock non-floating tandem process as described above, and in the conventional technology, in order to float the launched ship through the submersion process, the part where the main cargo is carried is made by the natural inflow of seawater. Compared to the way in which a launched ship is immersed in water, it is possible to minimize hull corrosion by forcing a separate injection of fresh water or seawater so that the partially launched ship does not float, and the same or different types of ships can be built in the same dry dock. Not only can a launched ship and a partially launched ship be built at the same time, but it can also be stably ensured that the partially launched ship does not float while maintaining the equilibrium state of the partially launched ship when the launched ship is moved out, and it can be carried out according to the construction steps of the partially launched ship. Different degrees of forced water injection are used to prevent the impact on the launch of the launched ship, and the series process can be used to continuously build large-scale construction ships while shortening the construction period.

In the above content, the present invention has been described in detail with reference to the accompanying drawings. However, the present invention is not limited thereto. Those with general knowledge in the technical field to which the present invention belongs can realize various modifications or embodiments within the scope of the present invention. Accordingly, the true scope of the invention is defined by the appended claims.

Claims (5)

1. A ship building process adapted for a dry dock non-floating tandem process, comprising:

respectively constructing a plurality of ship segments of the same type or different types in one or two rows in the same dry dock, performing a part of ship hull engineering of the launch ship in a dock adjacent area, and performing a part of ship hull engineering of the launch ship in a dock adjacent area;

a step of forcibly injecting water into the partially launched vessel by a pump before the dock gate of the dry dock is opened to allow seawater to flow in;

a step of causing seawater to flow in by opening a dock gate of the dry dock so that the launch vessel is floated and the part of the launch vessel is not floated;

a step of moving the floating launch vessel to the external bank wall of the dock gate;

a step of discharging seawater from the dry dock by closing the dock gate; the method comprises the steps of,

the step of engineering the remaining hull part of the partially launched vessel is performed at the same location,

wherein in the step of forcibly filling water into the interior of the partially launched vessel by means of a pump,

in order to offset buoyancy of the partial launch vessel and maintain equilibrium with the center of gravity, fresh water or seawater is forcibly injected into the interior of the cargo space in which the bulkhead is formed in the partial launch vessel by the pump, and the cargo space and the water injection amount to be forcibly injected with fresh water or seawater are variously determined according to the construction steps of the partial launch vessel.

2. The ship building process adapted for a dry dock non-floating tandem process according to claim 1, wherein:

when the deck house and the cabin shed of the part of the launch ship are mounted, fresh water or seawater is forcibly injected into a pair of left and right crude oil tanks adjacent to the cabin shed.

3. The ship building process adapted for a dry dock non-floating tandem process according to claim 1, wherein:

when the deck house and the cabin shed of the part of the launch ship are not mounted, most fresh water or seawater is forcibly injected into a pair of left and right crude oil tanks adjacent to the cabin shed, and the rest fresh water or seawater is forcibly injected into a pair of left and right oil sewage tanks.

4. A ship building process adapted for a dry dock non-floating tandem process according to claim 2 or claim 3, wherein:

when the seawater is forcibly injected, the seawater is injected after the salt and chlorine are removed by the seawater desalination device.

5. The ship building process for a dry dock non-floating tandem process according to claim 1, further comprising:

and executing the hull part engineering of the subsequent ship at the launch position.