WO2021132840A1

WO2021132840A1 - Shipbuilding method employing non-floating tandem method in dry dock

Info

Publication number: WO2021132840A1
Application number: PCT/KR2020/011740
Authority: WO
Inventors: 박강호; 조성원
Original assignee: 대우조선해양 주식회사
Priority date: 2019-12-26
Filing date: 2020-09-02
Publication date: 2021-07-01
Also published as: JP7341627B2; KR102157346B1; JP2023504152A; CN114787031A; CN114787031B

Abstract

The present invention provides a shipbuilding method employing a non-floating tandem method in a dry dock and comprising: a step of constructing a plurality of homogeneous or heterogeneous ship blocks in one column or two columns in the same dry dock, performing hull work on a partially launched ship in an area adjacent to a dock head, and performing partial hull work on a launched ship in an area adjacent to a dock gate; a step of forcedly pouring water into the partially launched ship through a pump; a step of floating the launched ship by opening the dock gate of the dry dock and introducing seawater, and non-floating the partially launched ship; a step of carrying out the floated launched ship to an inner wall outside the dock gate; a step of closing the dock gate and draining seawater from the dry dock; and a step of performing remaining partial hull work on the partially launched ship at the same position.

Description

Shipbuilding method using dry dock non-floating tandem method

The present invention can stably non-float while maintaining the balance of the partially launched ship when the launching ship is unloaded while simultaneously building the launching ship and the partially launched ship when building the same type or different types of ships in the same dry dock. And, it relates to a ship construction method to which the dry dock non-floating tandem method is applied, which can not affect the launch of the launched ship by forced watering differently according to the construction stage of the partially launched ship.

As is well known, for the efficient construction of large ships, ships are built by the dry dock method (dry dock method). The ship blocks are built in the dry dock, seawater is introduced into the dry dock, the ship is lifted, and the ship is lifted to the quay wall and taken out. do.

On the other hand, the tandem method is being applied to simultaneously build a launching vessel and a partially launched vessel by utilizing the free space in the dry dock.

For example, when applying the tandem method of launching ships of extra-large container ships and VLCCs of partially launching ships, when seawater flows into the dry dock, the bulkheads of the partially launched ships are disproportionately inclined toward the end of the stern due to the buoyancy of the cargo tank area. When the tug is lifted, the part supporting the partially launched vessel is toppled by the screw rotation of the tug, and there is a possibility that the partially launched vessel is overturned. At the same time, there is a limit that cannot be dried.

As a prior art for solving such a limitation, Korean Patent Registration No. 10-0796410 is disclosed. The immersion method applied to the conventional tandem construction method is a step of building a ship block by the tandem construction method in the dock. The steps of installing main engine, tail and intermediate axle, stern block, lashing bridge or hatch cover in the ship subject to flooding, and in the cargo/hold ballast of the ship subject to flooding and some double bottom tanks when the launching ship is buoyed. It consists of a step of flooding the vessel at the same location by naturally flowing in water, and a step of towing the launching vessel and then proceeding with the building of the submerged vessel. After loading all the payloads, the hull is submerged to build the vessel at the same location without moving the hull. make it complete

However, with the main payload mounted on the partially launched vessel, the partially launched vessel is flooded by naturally flowing into the cargo/hold ballast and some double-bottom tanks by the water flowing in for the floating of the launching vessel, as shown in FIG. As described above, this is possible only after all the main payloads have been installed on the partially launched vessel before launching the launching vessel, so the salvage time of the launching vessel is delayed depending on the construction stage of the partially launched vessel after the construction of the launching vessel is completed. There is a problem, there is a possibility of hull corrosion by salt and chlorine due to the submersion of the partially launched ship by water naturally introduced into the dock, that is, seawater, and the air is delayed due to the preceding process or the subsequent process for preventing hull corrosion There is this.

Accordingly, there is a need for an improved tandem method capable of minimizing the delay in air by salvaging the launching vessel regardless of the construction stage of the partially launched vessel and minimizing hull corrosion in preparation for flooding of the partially launched vessel.

The technical task to be achieved by the idea of the present invention is to minimize the air delay by salvaging the launched ship regardless of the construction stage of the partially launched ship, and to minimize the hull corrosion in preparation for the submersion of the partially launched ship, dry dock An object of the present invention is to provide a shipbuilding method using the non-floating tandem method.

In order to achieve the above object, the present invention builds a plurality of same or different types of ship blocks in one or two rows in the same dry dock, respectively, and performs the hull construction of a partially launched ship in the area adjacent to the dock head, and the dock performing the hull part construction of the launching vessel in the area adjacent to the gate; forced watering through a pump into the partially launched ship; opening the dock gate of the dry dock to introduce seawater to float the launching vessel, and non-floating the partially launched vessel; discharging the floated launching vessel to the outer quay wall of the dock gate; closing the dock gate to drain seawater from the dry dock; and performing the remaining hull part construction for the partially launched ship at the same location; provides a shipbuilding method to which the dry dock non-floating tandem method is applied, including.

Here, in order to offset the buoyancy of the partially launched vessel and maintain a balance with the COG, fresh water or seawater may be forcibly poured through the pump into the cargo tank in which the bulkhead of the partially launched vessel is formed.

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

In addition, fresh water or seawater may be forcibly poured into the SCO tank and the slop tank.

In addition, when forcibly pouring seawater, it can be poured after removing salt and chlorine through a seawater desalination device.

In addition, it may further include the step of performing the hull part construction of the subsequent ship at the launching ship unloading position.

According to the present invention, by separately forcibly pouring fresh water or seawater, the partially launched vessel is not floated while minimizing hull corrosion, and when the same type or different type of vessel is built in the same dry dock, both the launching vessel and the partially launched vessel are built at the same time. In the event of unloading of a launching vessel, the partially launched vessel can be stably undisturbed in a state of maintaining the balance, and it may not affect the launching of the launched vessel by forced watering differently according to the construction stage of the partially launched vessel. And, there is an effect that it is possible to continuously build a large-sized ship while shortening the time by the tandem method.

1 illustrates an immersion method applied to a tandem drying method according to the prior art.

Figure 2 shows a flowchart of a ship construction method to which the dry dock non-floating tandem method is applied according to an embodiment of the present invention.

FIG. 3 schematically shows a dry dock in which a ship building method to which the dry dock non-floating tandem method of FIG. 2 is applied is implemented.

4 is a view showing the stern cross-sectional structure of the partially launched ship to which the ship building method to which the dry dock non-floating tandem method of FIG. 2 is applied.

Figure 5 shows a process flow chart of the non-floating tandem method in the dry dock of Figure 3, respectively.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

Referring to Figure 2, the ship construction method to which the dry dock non-floating tandem method according to the embodiment of the present invention is applied is, as a whole, the hull construction and the hull part construction performing step (S110), the forced watering step (S120), Seawater inflow step (S130), launching vessel unloading step (S140), seawater drainage step (S150), residual hull part construction step (S160), and subsequent ship hull part construction step (S170). The gist is to enable continuous tandem construction of ships.

Specifically, with reference to FIGS. 2 to 5, the ship building method to which the dry dock non-floating tandem method according to an embodiment of the present invention is applied will be described in detail as follows.

First, in the hull construction and hull partial construction performing step (S110), as shown in FIGS. 3 and 5 (a), in the same dry dock, a plurality of ships of the same type or of different types of ships in one row or two rows in a ship block , respectively, carry out the hull construction of the partial launching vessel in the area adjacent to the dock head, and the partial hull construction of the launching vessel in the area adjacent to the dock gate.

Here, the launching vessel or the partially launched vessel is not particularly limited, but may be a very large crude oil carrier (VLCC), a very large container ship, an LNG carrier, an LNG-powered ship or a large dry ship of a chemical product carrier, etc. , In the same dry dock with a length of 500m or more, it is possible to simultaneously build a launching vessel with a length of around 400m (LOA; Length Of Overall) and a partially launched vessel with an overall length of around 120m in one row or two rows in the same dry dock.

For reference, the distance between the dock head and the partially launched vessel and the distance between the dock gate and the launching vessel requires an interval of about 5 m, and the distance between the partially launched vessel and the launching vessel requires an interval of about 10 m.

Subsequently, in the forced watering step ( S120 ), as shown in FIG. 3 , as shown in FIG. 3 , a partially launched vessel, that is, a partially launched vessel, is forcibly poured into the partially launched vessel through a pump (P) and when seawater flows into the dock. Make sure that the bow part of the body is not lifted by its own buoyancy.

That is, to offset the buoyancy of the partially launched ship due to the seawater density that varies depending on the water temperature, salinity and water pressure and to maintain the balance with the COG, a pump (P) is installed inside the cargo tank where the bulkhead of the partially launched ship is formed. By forcibly pouring fresh water or sea water through it, the partially launched vessel is not lifted from the support to prevent block overturning in place.

On the other hand, referring to FIG. 4, at the time of forced watering, when the deck house (D/H) (A) and the engine casing (B) of the partially launched ship are mounted, the bow part of the partially launched ship In other words, forcibly pouring water into a pair of left and right SCO tanks (SCO TK(P),(S)) adjacent to the engine casing (B), respectively, but based on the VLCC, pour water at around 8000 tons each, so that the bow of the partially launched ship is not lifted. To avoid partial levitation by balancing the COG biased toward the rear end of the stern while avoiding it, the front and rear of the stern are unevenly inclined. For example, 8000 tons can be poured into No. 5 SCO TK(P), and 7,950 tons can be poured into No. 5 SCO TK(S) for a total of 15,950 tons.

Alternatively, when the deck house (A) and the engine casing (B) of the partially launched ship are not mounted, the COG is less biased toward the rear end of the stern than when mounted, and most of them are forced into a pair of left and right SCO tanks adjacent to the engine casing (B). The remaining water is poured into the pair of left and right slop tanks (SLOP TK(P), (S)), but based on the VLCC, water is poured into the pair of left and right SCO tanks at around 7000 tons each, and the left and right pair of slop tanks Water around 800 tons each so that the stern does not float and balance the COG that is relatively less biased towards the rear end of the stern so that the front and rear of the stern are not inclined to be partially lifted. For example, you can pour 7100 tons into No. 5 SCO TK(P,S), 860 tons for SLOP TK(P), and 750 tons for SLOP TK(S) for a total of 15810 tons. .

Here, fresh water or seawater can be forcibly poured into the SCO tank and the slop tank through the pump (P). And it may be watered after removing chlorine.

Accordingly, in accordance with the building stage of the partially launched vessel, fresh water or seawater is forcibly poured in a different way to stably buoy while maintaining the balance of the partially launched vessel, and the delay in air does not affect the launching of the launched vessel can be minimized.

For reference, the pump (P) is shown to be disposed in the dry dock, but it can be mounted on a partially launched vessel to force watering, and the slop tank is a mixture of oil and seawater formed after cleaning various tanks or flows from the engine room. As a tank to store and store the oily mixture of waste oil, it is arranged for the purpose of preventing marine pollution by oil and reducing cargo loss.

Subsequently, in the seawater inflow step (S130), as shown in (b) of FIG. 5, the dock gate of the dry dock is opened and seawater is introduced to float the launching vessel, and the partially launched vessel is not floated in place. make it

Subsequently, in the launching vessel unloading step (S140), as shown in FIGS. 3 and 5 (c), the lifted launching vessel is lifted to the outer quay wall of the dock gate by the tug vessel and carried out.

Subsequently, in the seawater drainage step (S150), the dock gate is closed to drain the seawater from the dry dock.

Subsequently, in the residual hull partial construction performing step (S160), as shown in (d) of FIG. 5, fresh water or seawater forcibly poured into the partially launched vessel is drained, and the partially launched vessel is placed in the same position that is submerged. The remaining hull part construction is carried out for the launching vessel.

Subsequently, in the subsequent ship hull part construction performing step (S170), as shown in (d) of FIG. 5, the hull part construction of the subsequent ship is performed at the launching ship unloading position.

Therefore, by the configuration of the shipbuilding method applying the dry dock non-floating tandem method as described above, the partially launched vessel equipped with the main payload is submerged by the seawater naturally flowing in for flotation of the launching vessel by the flooding method of the prior art. In contrast to this, the partially launched vessel is not floated while minimizing hull corrosion by forcibly pouring fresh water or seawater separately, and when building the same type or different types of vessels in the same dry dock, both the launching vessel and the partially launched vessel are built at the same time. In the event of unloading of a launching vessel, the partially launched vessel can be stably undisturbed in a state of maintaining the balance, and it may not affect the launching of the launched vessel by forced watering differently according to the construction stage of the partially launched vessel. And it is possible to make it possible to continuously build large-scale ships while shortening the air by the tandem method.

In the above, the present invention has been described with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments within the scope equivalent to the present invention are possible by those of ordinary skill in the art to which the present invention pertains. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

Claims

In the same dry dock, build a plurality of blocks of the same type or different types in one or two rows, respectively, but carry out the hull construction of the partially launched vessel in the area adjacent to the dock head, and the partial construction of the hull of the launching vessel in the area adjacent to the dock gate. performing;

forced watering through a pump into the partially launched ship;

opening the dock gate of the dry dock to introduce seawater to float the launching vessel, and non-floating the partially launched vessel;

discharging the floated launching vessel to the outer quay wall of the dock gate;

closing the dock gate to drain seawater from the dry dock; and

A ship construction method to which the dry dock non-floating tandem method is applied, including; performing the remaining hull partial construction for the partially launched vessel at the same location.
The method of claim 1,

Dry dock non-floating tandem, characterized in that fresh water or seawater is forcibly poured through the pump into the cargo tank in which the bulkhead of the partially launched ship is formed so as to offset the buoyancy of the partially launched ship and maintain the balance with the COG A ship construction method that applies the construction method.
3. The method of claim 2,

When the deck house and the engine casing of the partially launched ship are mounted, the dry dock non-floating tandem method is applied, characterized in that forcibly pouring water into a pair of left and right SCO tanks adjacent to the engine casing, respectively.
3. The method of claim 2,

When the deck house and the engine casing of the partially launched ship are not mounted, most of them are forcibly poured into a pair of left and right SCO tanks adjacent to the engine casing, and the remaining forced water is poured into a pair of left and right slop tanks, respectively. Dry, A shipbuilding method using the dock non-floating tandem method.
5. The method according to claim 3 or 4,

A shipbuilding method to which a dry dock non-floating tandem method is applied, characterized in that fresh water or seawater is forcibly poured into the SCO tank and the slop tank.
6. The method of claim 5,

A ship construction method using the dry dock non-floating tandem method, characterized in that the water is poured after removing salt and chlorine through a seawater desalination device when forcibly pouring seawater.
The method of claim 1,

A ship construction method to which the dry dock non-floating tandem method is applied, characterized in that it further comprises the step of performing the hull part construction of the subsequent ship at the launching position of the ship carrying out position.