WO2020075641A1 - Ship manufacturing method - Google Patents

Abstract

This ship manufacturing method includes: a step for removing, from an existing ship (1) having a hull (2) that has an array of a plurality of tanks (3) in the bow-stern direction (Da), some of the tanks (3) and an intermediate hull portion (5C) that includes the portion of the hull (2) in which said tanks (3) are provided in the bow-stern direction (Da); and a step for joining a bow-side hull portion (5A) that was disposed further towards the bow (2a) side than the intermediate hull portion (5C) with a stern-side hull portion (5B) that was disposed closer to the stern (2r) side than the intermediate hull portion (5C).

Description

Ship manufacturing method

The present invention relates to a ship manufacturing method.
The present application claims priority to Japanese Patent Application No. 2018-192053 filed in Japan on October 10, 2018, the contents of which are incorporated herein by reference.

A ship that transports liquefied natural gas (LNG: Liquid Natural Gas) or the like includes a hull and a plurality of tanks. These plurality of tanks are arranged side by side in the fore-and-aft direction of the hull, and each holds a load such as LNG.
Such ships are used for a long period of time, for example, 20 years or more. On the other hand, ships such as those mentioned above are becoming larger in size with the times, and the fuel consumption rate during navigation is improving due to the progress of propulsion engines. As a result, older vessels tend to have lower utilization rates, even though they are still available.

Patent Document 1 discloses a method of converting two tankers into a combined carrier and floating dock in order to utilize old tankers and open tankers. In this method, one tanker with the stern part cut and removed can be connected to the other tanker with the bow part cut and removed.

JP-A-60-18480

By the way, in the case of a ship that carries LNG or the like, the tank is made of a material such as an aluminum alloy that does not easily corrode, and therefore has high utility value. Therefore, if the hull and the propulsion mechanism are available, there is a demand to effectively utilize the ship.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ship manufacturing method capable of effectively utilizing an existing ship having a plurality of tanks.

The present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, a method for manufacturing a ship is provided, from an existing ship having a hull in which a plurality of tanks are arranged in a bow-stern direction, to a part of the plurality of tanks and the hull. A cutting step of cutting an intermediate hull part including a part of the hull in the bow-stern direction in which the part of the tank is provided, and a bow-side hull part arranged on the bow side of the intermediate hull part in the hull And a joining step of joining the stern-side hull portion arranged on the stern side of the intermediate hull portion in the hull.

In this way, by cutting the intermediate hull part including a part of the tank from the existing ship and joining the bow side hull part and the stern side hull part, the bow-stern direction length is shorter than that of the existing ship, and the tank A small number of ships can be manufactured. Such a ship has a small load capacity of the cargo to be stored in the tank, and can be turned quickly. Therefore, it becomes possible to effectively use a ship even in a port or a route where a large ship is inefficient or difficult to navigate. Further, since the total weight is smaller than that of the existing ship, the fuel consumption rate of the propulsion engine for navigation is also improved. Therefore, it is possible to effectively use the existing ship having a plurality of tanks.

According to the second aspect of the present invention, in the joining step according to the first aspect, the bow-side hull portion and the stern-side hull are provided between the rear end of the bow-side hull portion and the front end of the stern-side hull portion. You may make it add the connection hull part which connects with a part.
With this configuration, the bow side hull and the stern side hull can be connected via the connecting hull. As a result, when the hull cross-sectional shapes of the rear end of the bow side hull and the front end of the stern side hull part are greatly different, etc., the bow hull part for connection should be satisfactorily connected to the bow hull part and the stern side hull part. You can In addition, various devices can be installed in the additional connection hull.

According to the third aspect of the present invention, the connecting hull portion according to the second aspect is a bow-side connecting portion in which the hull cross-sectional shape orthogonal to the bow-stern direction is the same shape as the rear end of the bow-side hull portion, A stern-side connecting portion having a hull cross-sectional shape that is orthogonal to the stern-stern direction and having the same shape as the front end of the stern-side hull portion, and an intermediate connecting portion that continuously connects the bow-side connecting portion and the stern-side connecting portion. , May be integrally provided.
With this configuration, the bow-side connecting portion of the connecting hull portion can be easily connected to the rear end of the bow-side hull portion. Similarly, the stern-side connecting portion of the connecting hull portion can be easily connected to the front end of the stern-side hull portion. Therefore, even if the rear end of the bow-side hull and the front end of the stern-side hull have different hull cross-sectional shapes, the connecting hull easily and continuously connects the bow-side hull and the stern-side hull. be able to.

According to a fourth aspect of the present invention, the connecting hull portion according to the second or third aspect is provided in the bow side piping and bow side wiring provided in the bow side hull section, and in the stern side hull section. You may make it provide the piping for connection and the wiring for connection which connect the stern side piping and the stern side wiring which were formed.
By configuring in this manner, the bow side piping and bow side wiring provided in the bow side hull section and the stern side piping and stern side wire provided in the stern side hull section Can be connected via.

According to the fifth aspect of the present invention, the intermediate hull portion according to any one of the first to fourth aspects, in a plurality of tanks arranged in the aft-stern direction, in the middle portion in the aft-stern direction. You may make it include the said one part tank arrange | positioned.
Generally, in a ship, the cross-sectional shape of the hull greatly changes in the bow-stern direction at the bow and stern, and the change in the cross-sectional shape of the hull is small at the middle part in the bow-stern direction. Therefore, by cutting off the intermediate hull including the tank arranged in the mid-stern direction, the difference in the hull cross-sectional shape between the rear end of the bow-side hull and the front end of the stern-side hull becomes small. This makes it easier to join the bow side hull part and the stern side hull part.

According to the above ship manufacturing method, an existing ship having a plurality of tanks can be effectively used.

It is a side view which shows the schematic structure of the existing ship used by the manufacturing method of the ship of 1st embodiment of this invention. It is a flowchart of the manufacturing method of the said ship. It is a side view which shows the state which cut the intermediate hull part of the existing ship in the manufacturing method of the said ship. FIG. 3 is a side view showing a state in which the bow side hull portion and the stern side hull portion of an existing vessel are joined in the method for manufacturing a vessel. FIG. 4 is a plan view showing a state in which the bow side hull portion and the stern side hull portion of an existing ship are joined in the method for manufacturing a ship. It is a flowchart of the manufacturing method of the ship of 2nd embodiment of this invention. It is a side view which shows the ship manufactured by the manufacturing method of the said ship. It is a top view which shows the ship manufactured by the manufacturing method of the said ship.

Hereinafter, a method for manufacturing a ship according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
The method for manufacturing a ship according to this embodiment uses an existing ship to manufacture the ship.
FIG. 1 is a side view showing a schematic configuration of an existing ship used in the ship manufacturing method of this embodiment.
As shown in FIG. 1, the existing ship 1 includes a hull 2 and a plurality of tanks 3. It has a pair of port sides 2s provided on both sides in the ship width direction and a ship bottom 2b. The hull 2 includes an upper deck 2t that is provided above the ship bottom 2b with a space therebetween. The hull 2 has an upper structure 2h on the stern 2r side in the bow-stern direction Da. The hull 2 includes a cargo loading section (hold) 2k on the bow 2a side in the bow-stern direction Da with respect to the upper structure 2h.

The upper deck 2t is a fully exposed deck that is exposed to the outside, and is provided so as to cover the cargo loading section 2k above.

The plurality of tanks 3 are independent tanks, and the liquefied gas such as LNG, which is a load, is housed inside the tanks 3. The tank 3 is formed of, for example, an aluminum alloy in order to ensure toughness in a low temperature atmosphere and corrosion resistance. A plurality of tanks 3 are arranged in the cargo loading section 2k in the hull 2 in the bow-aft direction Da. The existing ship 1 in this embodiment exemplifies a case in which five tanks 3 which are moss-type independent spherical tanks are provided. The upper portions 3a of the tanks 3 are arranged above the upper deck 2t.

FIG. 2 is a flowchart of the method for manufacturing the ship. FIG. 3 is a side view showing a state in which an intermediate hull portion of an existing ship is cut off in the method for manufacturing a ship.
As shown in FIG. 2, the ship manufacturing method using the existing ship 1 includes a cutting step S1 and a joining step S2.

In the cutting step S1, as shown in FIG. 3, the intermediate hull portion 5C, which is the intermediate portion in the bow-stern direction Da, is cut from the existing vessel 1. Here, the intermediate hull portion 5C refers to a part of the tanks 3 of the plurality of tanks 3 and a part of the hull 2 of the existing ship 1 in the bow-stern direction Da in which the part of the tanks 3 are provided. It is a part including the hull 2 of the part.

In order to perform the above cutting, the hull 2 of the existing ship 1 is located at a position P1 having a predetermined dimension in the bow-stern direction Da from the bow 2a side and a position P2 having a predetermined dimension in the bow-stern direction Da from the stern 2r side. Cut each. These positions P1 and P2 are set between the tanks 3 that are adjacent to each other in the bow-stern direction Da. In this way, by cutting the hull 2 at the positions P1 and P2, the existing ship 1 has the intermediate hull portion 5C arranged in the middle portion in the bow-stern direction Da and the bow of the intermediate hull portion 5C rather than the intermediate hull portion 5C. Since it is divided into the bow side hull portion 5A arranged on the 2a side and the stern side hull portion 5B arranged on the stern 2r side of the intermediate hull portion 5C, only the intermediate hull portion 5C is removed.

In this embodiment, for example, between the position P1 set between the first tank 3A and the second tank 3B from the bow 2a side and the position between the third tank 3C and the fourth tank 3D from the bow 2a side. The hull 2 is cut at the position P2 set to. That is, the intermediate hull portion 5C in this embodiment includes the hull 2C between the position P1 and the position P2 which is a part of the intermediate portion in the bow-stern direction Da, the second tank 3B from the bow 2a side, and the third tank 3B. And the tank 3C. As described above, the intermediate hull portion 5C includes the tanks 3B and 3C that are arranged in the middle portion of the plurality of tanks 3 in the fore-aft direction Da.

In the joining step S2, as shown in FIGS. 4 and 5, the rear end 5r of the bow-side hull portion 5A and the front end 5f of the stern-side hull portion 5B are joined. The rear end 5r of the bow side hull portion 5A and the front end 5f of the stern side hull portion 5B are joined mainly by welding. When the shape of the cutting surface of the hull 2 is different between the rear end 5r of the bow side hull portion 5A and the front end 5f of the stern side hull portion 5B, the rear end 5r of the bow side hull portion 5A and the stern side hull portion 5B A connection plate 8 (see FIG. 5) may be provided between the front end 5f and the front end 5f so as to extend in the plane direction intersecting the bow-stern direction Da.

For example, when part or all of the manifold 23 provided in the existing ship 1 is arranged in the intermediate hull part 5C, part or all of the manifold 23 may be provided in the bow side hull part 5A. . Further, the cargo equipment 24 such as a cargo pump is provided in the stern side hull portion 5B of the existing ship 1, and therefore may be provided at the position as it is.

After joining the rear end 5r of the bow side hull portion 5A and the front end 5f of the stern side hull portion 5B, various pipes and wires are connected between the bow side hull portion 5A and the stern side hull portion 5B. By doing this, the ship 10A is manufactured.
The ship 10A has a hull 2X which is shorter than the existing ship 1 (see FIG. 1) in the bow-stern direction Da. Further, the ship 10A has a smaller number of tanks 3 than the existing ship 1.

In the method for manufacturing the ship 10A according to the first embodiment described above, the intermediate hull part 5C including the two tanks 3 is cut off, and the bow side hull part 5A and the stern side hull part 5B are joined. As a result, it is possible to manufacture the ship 10 </ b> A including the hull 2 </ b> X that is shorter than the existing ship 1 in the fore-and-aft direction Da and the number of tanks 3 that is smaller than that of the existing ship 1. Such a ship 10A has a small load capacity of the load accommodated in the tank 3 and can be turned around quickly. Therefore, it is advantageous when the large existing vessel 1 is inefficient or is a port or route that is difficult to navigate. Further, since the total weight of the ship 10A is smaller than that of the existing ship 1, the fuel consumption rate of the propulsion engine for navigation is also improved. In this way, it becomes possible to effectively use the existing ship 1 including the plurality of tanks 3.

(Second embodiment)
Next, a second embodiment of the method for manufacturing a ship according to the present invention will be described. In the second embodiment described below, only the configuration of the connecting hull portion 20 is different from the first embodiment, so the same parts as those in the first embodiment will be denoted by the same reference numerals and will not be described. To do.

FIG. 6 is a flowchart of the method for manufacturing a ship according to the second embodiment of the present invention. FIG. 7 is a side view showing a ship manufactured by the ship manufacturing method. FIG. 8 is a plan view showing a ship manufactured by the ship manufacturing method.
As shown in FIG. 6, the ship manufacturing method using the existing ship 1 in the second embodiment includes a cutting step S11, a connecting hull inserting step S12, and a joining step S13.

In the cutting step S11, the intermediate hull portion 5C is cut from the existing ship 1 as in the first embodiment (see FIG. 3).

In the connecting hull insertion step S12, as shown in FIGS. 7 and 8, the rear end 5r of the bow side hull portion 5A, which is arranged on the bow 2a side of the cut intermediate hull portion 5C, and the intermediate hull portion 5C. The connecting hull portion 20 is inserted between the front end 5f of the stern side hull portion 5B, which is arranged closer to the stern 2r than the stern 2r.

The connecting hull part 20 is connected to the bow side hull part 5A and the stern side hull part 5B respectively in a joining step S13 described later. The connecting hull portion 20 integrally includes a bow-side connecting portion 20a, a stern-side connecting portion 20r, and an intermediate connecting portion 20c. The cross-sectional contour of the bow-side connecting portion 20a viewed from the bow-stern direction Da, in other words, the hull cross-sectional shape of the bow-side connecting portion 20a orthogonal to the bow-stern direction Da is the cutting surface of the rear end 5r of the bow-side hull portion 5A. It has the same shape as the contour. Similarly, the cross-sectional contour of the stern-side connecting portion 20r viewed from the stern-side direction Da, in other words, the hull cross-sectional shape of the stern-side connecting portion 20r orthogonal to the stern-side direction Da is the cutting of the front end 5f of the stern-side hull portion 5B. It has the same shape as the contour of the surface.

In this way, the intermediate connecting portion 20c is formed so as to continuously connect the bow-side connecting portion 20a and the stern-side connecting portion 20r. That is, the connecting hull portion 20 is provided so that the outer surface of the hull 2Y is continuous between the bow side hull portion 5A and the stern side hull portion 5B.
The connecting hull portion 20 may make the length L in the bow-stern direction Da smaller than the length in the bow-stern direction Da for one tank 3. By doing so, it is possible to prevent the length of the boat 10B in the bow-stern direction Da from increasing.

The connecting hull portion 20 has a pair of port sides 20s provided on both sides in the ship width direction and a ship bottom 20b. The connecting hull portion 20 includes an upper deck 20t that is provided above the ship bottom 20b with a gap.

As shown in FIG. 7, the connecting hull portion 20 has a connecting pipe and a connecting wire 21 inside. The connection pipe and the connection wiring 21 include a bow side pipe and a bow side wiring 6 provided in the bow side hull portion 5A, and a stern side pipe and a stern side wiring 7 provided in the stern side hull portion 5B. Connecting.

In the joining step S13, the bow side hull portion 5A and the stern side hull portion 5B are joined via the connecting hull portion 20. Specifically, the rear end 5r of the bow side hull portion 5A and the bow side connecting portion 20a of the connecting hull portion 20 are joined by welding, and the front end 5f of the stern side hull portion 5B and the connecting hull portion 20 are connected. The stern-side connecting portion 20r is joined by welding.

In the joining step S13, the upper deck 20t of the connecting hull portion 20 and the upper deck 2t of the bow side hull portion 5A and the stern side hull portion 5B are further joined by welding.
In the joining step S13, the bow side piping and the bow side wiring 6 and the stern side piping and the stern side wiring 7 are connected to the connecting piping and the connecting wiring 21 in the connecting hull portion 20, respectively.

Here, when a part or all of the manifold 23 provided in the existing ship 1 is provided in the intermediate hull portion 5C, the manifold 23 may be provided in the connecting hull portion 20.

The ship 10B may be provided with a ballast tank 25 or the like for improving the balance of the ship 10B due to the removal of the intermediate hull part 5C in the connecting hull part 20.
Further, the connecting hull 20 may be provided with various devices such as a regasification device and a ballast treatment device (both not shown), an article storage space, and the like.
In this way, the boat 10B is manufactured by additionally installing the connecting hull portion 20 between the bow side hull portion 5A and the stern side hull portion 5B. By providing the connecting hull portion 20, the draft of the ship 10B can be made shallow, and LNG transportation at an LNG base having a shallow water depth can be supported.

In the method for manufacturing the ship 10B of the second embodiment described above, the intermediate hull part 5C including the two tanks 3 is cut off, and the connecting hull part 20 is added between the bow side hull part 5A and the stern side hull part 5B. I have set up. As a result, the ship 10 </ b> B including the hull 2 </ b> Y having a shorter length in the bow-stern direction Da than the existing ship 1 and the tank 3 having the smaller number can be manufactured from the existing ship 1. In this way, it becomes possible to effectively use the existing ship 1 including the plurality of tanks 3.

Even if the rear hull portion 5A of the bow-side hull portion 5A and the front end 5f of the stern-side hull portion 5B greatly differ in cross-sectional shape due to the connecting hull portion 20, the bow-side hull portion 5A and the stern side The hull portion 5B can be satisfactorily connected to the hull portion 20 for connection. In addition, various devices and the like can be installed in the additional connection hull 20.

Furthermore, since the connecting hull portion 20 includes the bow-side connecting portion 20a and the stern-side connecting portion 20r, the bow-side hull portion 5A and the stern-side hull portion 5B can be continuously connected.

Further, the connecting hull portion 20 includes connecting pipes and connecting wires 21. Thereby, the bow side piping and the bow side wiring 6 provided in the bow side hull portion 5A and the stern side piping and the stern side wiring 7 provided in the stern side hull portion 5B It can be connected via the wiring 21.
Since the bow-side hull portion 5A and the stern-side hull portion 5B are part of the same existing ship 1, the bow-side piping and the bow-side wiring 6 and the stern-side piping and the stern-side wiring 7 are in the bow-stern direction. In many cases, they are arranged at the same position on the cross section orthogonal to Da. Therefore, the bow side piping and the bow side wiring 6 and the stern side piping and the stern side wiring 7 can be particularly easily connected via the connecting piping and the connecting wiring 21.

(Other modifications)
The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention. That is, the specific shape, configuration, and the like described in the embodiment are merely examples, and can be appropriately changed.
For example, in the above-described embodiment, the intermediate hull portion 5C includes the second tank 3B and the third tank 3C from the bow 2a side, but the present invention is not limited to this. The intermediate hull portion 5C may include the tank 3 arranged in the middle portion in the bow-stern direction Da among the plurality of tanks 3, or may include the tank 3 on the bow side in the bow-stern direction Da and the tank 3 on the stern side. You may stay.
Furthermore, the number of tanks 3 of the existing ship 1, the number of tanks 3 to be cut from the existing ship 1, the number of tanks 3 of the ships 10A and 10B, and the shape of the tank 3 may be any.
In addition, the tank 3 is not limited to one that stores LNG, and may be one that stores another load such as liquefied petroleum gas (LPG).

According to the above ship manufacturing method, an existing ship having a plurality of tanks can be effectively used.

1 Existing Ship 2 Hull 2C Hull 2X Hull 2Y Hull 2a Bow 2b Ship Bottom 2h Upper Structure 2k Cargo Loading Section 2r Stern 2s Portside 2t Upper Deck 3, 3A, 3B, 3C, 3D Tank 3a Upper 5A Bow Side Hull Part 5B Stern Side Hull Part 5C Intermediate hull part 5f Front end 5r Rear end 6 Bow side piping and bow side wiring 7 Stern side piping and stern side wiring 8 Connection plates 10A, 10B Vessel 20 Connecting hull part 20a Bow side connecting part 20r Stern side connecting part 20c Middle Connection part 20s Port side 20b Ship bottom 20t Upper deck 21 Connection piping and connection wiring 23 Manifold 24 Cargo equipment 25 Ballast tank Da Bow direction S1, S11 Excision step S2, S13 Joining step S12 Connection hull insertion step

Claims (5)

From an existing ship having a hull in which a plurality of tanks are arranged in the bow-stern direction, a part of the tanks of the plurality of tanks and a part of the hull in the bow-stern direction in which the part of the tanks are provided A cutting step of cutting the intermediate hull part including the hull of
A joining step of joining a bow side hull portion arranged on the bow side of the intermediate hull portion and a stern side hull portion arranged on the stern side of the intermediate hull portion,
A method of manufacturing a ship including :. In the joining step, a connecting hull part for additionally connecting the bow side hull part and the stern side hull part is additionally provided between the rear end of the bow side hull part and the front end of the stern side hull part. 1. The method for manufacturing a ship according to 1. The connection hull part,
A bow-side connecting portion in which the hull cross-sectional shape orthogonal to the bow-stern direction is the same shape as the rear end of the bow-side hull portion,
A stern-side connecting portion in which the hull cross-sectional shape orthogonal to the stern-direction is the same shape as the front end of the stern-side hull portion,
An intermediate connecting portion that continuously connects the bow-side connecting portion and the stern-side connecting portion,
The ship manufacturing method according to claim 2, wherein the ship is integrally provided. The connection hull portion connects the bow side piping and the bow side wiring provided in the bow side hull portion, and the stern side piping and the stern side wiring provided in the stern side hull portion, the connection piping and The method for manufacturing a ship according to claim 2, further comprising a connection wiring. The said intermediate hull part contains the said one part tank arrange | positioned among the said some tanks arranged in the bow-stern direction in the middle part of the bow-stern direction. Ship manufacturing method.

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