JP7442965B2 - Ship manufacturing method - Google Patents

Description

The present invention relates to a method of manufacturing a ship.

A ship that transports liquefied natural gas (LNG) or the like includes a hull and a plurality of tanks. These plurality of tanks are arranged side by side in the bow and stern direction of the hull, and each accommodates a load such as LNG.
Such vessels are used for long periods of time, for example over twenty years. On the other hand, ships such as those described above have become larger with the times, and fuel consumption rates during navigation have improved due to advancements in propulsion engines. Therefore, even though older ships are still usable, their operating rates tend to be low.

Patent Document 1 discloses a method of converting two tankers into a connected carrier/floating dock in order to make use of old tankers and idle tankers. In this method, one tanker whose stern section has been cut off and removed can be connected to the other tanker whose bow section has been cut off and removed.

Japanese Unexamined Patent Publication No. 18480/1983

By the way, in the case of a ship transporting LNG or the like, the tank is made of a material that does not easily corrode, such as an aluminum alloy, and therefore has high utility value. Therefore, there is a desire to utilize ships effectively as long as the hull and propulsion engine are available.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a ship that can effectively utilize an existing ship equipped with a plurality of tanks.

In order to solve the above problems, the present invention employs the following means.
According to a first aspect of the present invention, a method for manufacturing a ship is such that from an existing ship having a hull in which a plurality of tanks are arranged in the bow and stern direction, some of the tanks among the plurality of tanks and one of the hulls are A cutting step of cutting out an intermediate hull section including a part of the hull in the bow and stern direction where some of the tanks are provided, and a rear end of the bow side hull section that is located closer to the bow side than the intermediate hull section. and a joining step of joining the front end of the stern side hull section disposed on the stern side of the intermediate hull section to a connecting hull section that connects the bow side hull section and the stern side hull section, respectively; The connecting hull section includes a bow side connection section whose hull cross-sectional shape perpendicular to the bow and stern direction has the same shape as the rear end of the bow side hull section, and a hull cross-sectional shape orthogonal to the bow and stern direction has the same shape as the rear end of the bow side hull section. a stern side connection part having the same shape as the front end of the stern side hull part; an intermediate connection part that continuously connects the bow side connection part and the stern side connection part; and a bow provided in the bow side hull part. The connecting pipe and the connecting wiring connect the side piping and the bow side wiring to the stern side piping and the stern side wiring provided in the stern side hull section, and the connecting piping and the connecting wiring are provided. The wiring is provided in the connection hull part before the joining process, and in the joining process, the bow side connection part and the rear end of the bow side hull part are joined by welding, and the wiring is connected to the stern side connection part by welding. The front end of the stern side hull section is joined by welding, and the bow side piping and bow side wiring and the stern side piping and stern side wiring are connected to the connection piping and connection wiring, respectively.

In this way, by removing the intermediate hull section, including some tanks, from an existing ship and joining the bow and stern hull sections, the length in the fore-and-aft direction is shorter than that of existing ships, and the tank is shorter than the existing ship. Ships can be manufactured in small numbers. Such ships have small cargo capacity in their tanks and are able to maneuver quickly. Therefore, ships can be used effectively even in ports and shipping routes where large ships are inefficient or difficult to navigate. Additionally, since the total weight will be smaller than existing ships, the fuel consumption rate of the propulsion engine for navigation will also improve. Therefore, it becomes possible to effectively utilize existing ships equipped with a plurality of tanks.

Furthermore , the bow side hull section and the stern side hull section can be connected via a connecting hull section. As a result, in cases where the cross-sectional shapes of the rear end of the bow-side hull section and the front end of the stern-side hull section are significantly different, the bow-side hull section and the stern-side hull section can be well connected by the connecting hull section. I can do it. Furthermore, various devices and the like can be installed in the additionally installed connection hull section.

Further , 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 connecting portion of the connecting hull can be easily connected to the forward end of the stern hull. Therefore, even if the cross-sectional shapes of the rear end of the bow-side hull section and the front end of the stern-side hull section are different, the bow-side hull section and the stern-side hull section can be easily and continuously connected by the connecting hull section. be able to.

Furthermore , the bow side piping and bow side wiring provided in the bow side hull section and the stern side piping and stern side wiring provided within the stern side hull section are connected via connection piping and connection wiring. I can do it.

According to a second aspect of the present invention, the intermediate hull section according to the first aspect includes some of the tanks arranged in the intermediate section in the bow and stern direction among the plurality of tanks arranged in the bow and stern direction. may also be included.
Generally, in a ship, the cross-sectional shape of the hull changes greatly in the bow and stern directions at the bow and the stern, and the change in the hull cross-sectional shape is small at the intermediate portion in the bow and stern direction. Therefore, by removing the intermediate hull section including the tank disposed at the intermediate section in the bow and stern direction, the difference in hull cross-sectional shape between the rear end of the bow hull section and the front end of the stern hull section is reduced. This makes it easier to join the bow side hull section and the stern side hull section.

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

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the schematic structure of the existing ship used in the manufacturing method of the ship of 1st embodiment of this invention. It is a flow chart of the manufacturing method of the above-mentioned ship. FIG. 2 is a side view showing a state in which an intermediate hull portion of an existing ship is removed in the method for manufacturing a 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 ship are joined in the method for manufacturing a ship. FIG. 3 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 flow chart of a manufacturing method of a ship of a second embodiment of this invention. It is a side view showing a ship manufactured by the above-mentioned ship manufacturing method. FIG. 2 is a plan view showing a ship manufactured by the above-mentioned ship manufacturing method.

Hereinafter, a method for manufacturing a ship according to an embodiment of the present invention will be described based on the drawings.
(First embodiment)
The ship manufacturing method of 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 sides 2s provided on both sides in the width direction of the ship and a bottom 2b. The hull 2 includes an upper deck 2t spaced apart above the bottom 2b. 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 compartment (hold) 2k closer to the bow 2a in the bow-stern direction Da than the upper structure 2h.

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

Each of the plurality of tanks 3 is an independent tank, and stores a liquefied gas such as LNG as a load therein. The tank 3 is made of, for example, an aluminum alloy to ensure toughness and corrosion resistance in a low-temperature atmosphere. A plurality of tanks 3 are arranged in the cargo loading compartment 2k in the hull 2 in the bow-stern direction Da. The existing ship 1 in this embodiment is exemplified as having five tanks 3 that are moss-type independent spherical tanks. The upper parts 3a of these 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 removed in the method for manufacturing a ship.
As shown in FIG. 2, the method for manufacturing a ship 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 section 5C, which is the intermediate section in the bow and aft direction Da, is cut out from the existing ship 1. Here, the intermediate hull section 5C refers to a section in the bow and aft direction Da where some of the tanks 3 of the plurality of tanks 3 and some of the tanks 3 of the hull 2 of the existing ship 1 are provided. This is the part that includes the hull 2 of the section.

To perform the above-mentioned cutting, the hull 2 of the existing ship 1 is located at a position P1 of a predetermined dimension from the bow 2a side in the bow-stern direction Da, and at a position P2 of a predetermined dimension from the stern 2r side in the bow-stern direction Da. Cut each. These positions P1 and P2 are set between tanks 3 that are adjacent to each other in the bow and 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 section 5C disposed at the intermediate section in the bow and stern direction Da, and the Only the intermediate hull section 5C is removed because it is separated into the bow side hull section 5A that was disposed on the 2a side and the stern side hull section 5B that was disposed on the stern 2r side with respect to the intermediate hull section 5C.

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

In the joining step S2, as shown in FIGS. 4 and 5, the rear end 5r of the bow side hull section 5A and the front end 5f of the stern side hull section 5B are joined. The rear end 5r of the bow side hull section 5A and the front end 5f of the stern side hull section 5B are joined mainly by welding. If the shape of the cross section of the hull 2 is different between the rear end 5r of the bow side hull section 5A and the front end 5f of the stern side hull section 5B, the rear end 5r of the bow side hull section 5A and the front end 5f of the stern side hull section 5B are different. A connecting plate 8 (see FIG. 5) may be provided between the front end 5f and the connecting plate 8 extending in a surface direction intersecting the bow and stern direction Da.

For example, if part or all of the manifold 23 provided in the existing ship 1 is placed in the intermediate hull section 5C, part or all of the manifold 23 may be provided in the bow side hull part 5A. . Further, since the cargo equipment 24 such as the cargo pump is provided in the stern side hull section 5B of the existing ship 1, it may be provided in the same position.

After the rear end 5r of the bow hull section 5A and the front end 5f of the stern hull section 5B are joined, various piping and wiring are connected between the bow hull section 5A and the stern hull section 5B. In this way, the ship 10A is manufactured.
The ship 10A has a hull 2X that is shorter in length in the bow and aft direction Da than the existing ship 1 (see FIG. 1). Further, the ship 10A has fewer tanks 3 than the existing ship 1.

In the method for manufacturing the ship 10A of the first embodiment described above, the intermediate hull section 5C including the two tanks 3 is cut out, and the bow side hull section 5A and the stern side hull section 5B are joined. Thereby, a ship 10A having a hull 2X having a shorter length in the bow and aft direction Da than the existing ship 1 and a smaller number of tanks 3 than the existing ship 1 can be manufactured. Such a ship 10A has a small amount of cargo to be accommodated in the tank 3, and can turn around easily. Therefore, it is advantageous when the large existing ship 1 is inefficient or difficult to navigate in a port or a sea route. Moreover, 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 utilize the existing ship 1 equipped with a plurality of tanks 3.

(Second embodiment)
Next, a second embodiment of the ship manufacturing method according to the present invention will be described. In the second embodiment described below, only the configuration of the connection hull section 20 differs from the first embodiment, so the same parts as in the first embodiment will be described with the same reference numerals, and duplicate explanations will be omitted. do.

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

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

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

The connecting hull section 20 is connected to the bow side hull section 5A and the stern side hull section 5B, respectively, in a joining step S13 described later. The connection hull section 20 integrally includes a bow side connection section 20a, a stern side connection section 20r, and an intermediate connection section 20c. The cross-sectional profile 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 perpendicular to the bow-stern direction Da is the same as the cross-sectional shape of the rear end 5r of the bow-side hull portion 5A. It has the same shape as the outline. Similarly, the cross-sectional profile of the stern side connection portion 20r as seen from the bow and stern direction Da, in other words, the hull cross-sectional shape of the stern side connection portion 20r perpendicular to the bow and stern direction Da is the cut 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 connection portion 20c is formed to continuously connect the bow side connection portion 20a and the stern side connection portion 20r. That is, the connecting hull section 20 is provided so that the outer surface of the hull 2Y is continuous between the bow hull section 5A and the stern hull section 5B.
The length L of the connecting hull section 20 in the bow and aft direction Da may be made smaller than the length of one tank 3 in the bow and aft direction Da. By doing so, it is possible to suppress the length of the vessel 10B in the bow and aft direction Da from increasing.

The connection hull section 20 has a pair of sides 20s provided on both sides in the width direction of the ship, and a bottom 20b. The connection hull section 20 includes an upper deck 20t that is spaced above the bottom 20b.

As shown in FIG. 7, the connection hull section 20 includes connection piping and connection wiring 21 therein. The connection piping and connection wiring 21 connect the bow side piping and bow side wiring 6 provided in the bow side hull section 5A, and the stern side piping and stern side wiring 7 provided in the stern side hull section 5B. Connecting.

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

In the joining step S13, the upper deck 20t of the connection hull section 20 and the upper decks 2t of the bow side hull section 5A and the stern side hull section 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 further connected to the connection piping and the connection wiring 21 within the connection hull section 20, respectively.

Here, if part or all of the manifold 23 provided in the existing ship 1 is provided in the intermediate hull section 5C, the manifold 23 may be provided in the connection hull section 20.

The vessel 10B may be provided with a ballast tank 25 or the like in the connecting hull section 20 to improve the balance of the vessel 10B due to the removal of the intermediate hull section 5C.
Further, the connection hull section 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 section 20 between the bow hull section 5A and the stern hull section 5B. By providing the connection hull section 20, the draft of the vessel 10B can be made shallow, and LNG transportation at an LNG terminal with shallow water depth becomes possible.

In the method for manufacturing the ship 10B of the second embodiment described above, the intermediate hull section 5C including the two tanks 3 is removed, and the connecting hull section 20 is added between the bow hull section 5A and the stern hull section 5B. It is set up. Thereby, a ship 10B having a hull 2Y having a shorter length in the bow and aft direction Da than the existing ship 1 and a smaller number of tanks 3 can be manufactured from the existing ship 1. In this way, it becomes possible to effectively utilize the existing ship 1 equipped with a plurality of tanks 3.

Furthermore, due to the connecting hull section 20, even if the hull cross-sectional shapes of the rear end 5r of the bow side hull section 5A and the front end 5f of the stern side hull section 5B are significantly different, the bow side hull section 5A and the stern side The hull section 5B can be well connected to the hull section 5B via the connecting hull section 20. Moreover, various devices and the like can be installed in the additionally installed connection hull section 20.

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

Further, the connection hull section 20 includes connection piping and connection wiring 21. Thereby, the bow side piping and bow side wiring 6 provided in the bow side hull section 5A and the stern side piping and stern side wiring 7 provided in the stern side hull section 5B are connected to the connection piping and the bow side wiring 6. Connection can be made via wiring 21.
Since the bow side hull section 5A and the stern side hull section 5B are part of the same existing ship 1, the bow side piping and bow side wiring 6, and the stern side piping and stern side wiring 7 are connected in the bow and stern direction. In many cases, they are arranged at the same position in a cross section perpendicular 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 connection piping and the connection wiring 21.

(Other variations)
This invention is not limited to the embodiments described above, but includes various modifications to the embodiments described above without departing from the spirit of the invention. That is, the specific shapes, configurations, etc. mentioned in the embodiments are merely examples, and can be changed as appropriate.
For example, in the above embodiment, the intermediate hull section 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 a tank 3 disposed at an intermediate portion in the bow and stern direction Da among the plurality of tanks 3, or may include tanks 3 on the bow side and the stern side in the bow and stern direction Da. You can stay there.
Furthermore, the number of tanks 3 in the existing ship 1, the number of tanks 3 removed from the existing ship 1, the number of tanks 3 in the ships 10A and 10B, and the shape of the tanks 3 may be any number.
In addition, the tank 3 is not limited to accommodating LNG, but may also be accommodating other cargo such as liquefied petroleum gas (LPG).

1 Existing ship 2 Hull 2C Hull 2X Hull 2Y Hull 2a Bow 2b Bottom 2h Superstructure 2k Cargo loading compartment 2r Stern 2s Broadside 2t Upper deck 3, 3A, 3B, 3C, 3D Tank 3a Upper part 5A Bow side hull section 5B Stern side hull Section 5C Intermediate hull section 5f Forward 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 Ship 20 Connection hull section 20a Forward side connection section 20r Stern side connection section 20c Intermediate Connection part 20s Broadside 20b Bottom 20t Upper deck 21 Connection piping and connection wiring 23 Manifold 24 Cargo equipment 25 Ballast tank Da Fore and aft direction S1, S11 Cutting process S2, S13 Joining process S12 Connection hull insertion process

Claims (2)

From an existing ship having a hull in which a plurality of tanks are arranged in the bow and stern direction, some of the tanks among the plurality of tanks and a part of the hull in the bow and stern direction where some of the tanks are installed a resection step of removing an intermediate hull portion including the hull of the ship;
The rear end of the bow-side hull section that was disposed on the bow side of the intermediate hull section and the front end of the stern-side hull section that was disposed on the stern side of the intermediate hull section are respectively referred to as the bow-side hull section. a joining step of joining to a connecting hull part that connects the stern side hull part,
The connection hull section is
a bow-side connecting portion having a hull cross-sectional shape perpendicular to the bow-stern direction having the same shape as the rear end of the bow-side hull portion;
a stern side connection part whose hull cross-sectional shape perpendicular to the bow and stern direction has the same shape as the front end of the stern side hull part;
an intermediate connection part that continuously connects the bow side connection part and the stern side connection part;
Connection piping and connection wiring that connect the bow side piping and bow side wiring provided in the bow side hull section and the stern side piping and stern side wiring provided in the stern side hull section;
has
The connection piping and the connection wiring are provided within the connection hull section before the joining step,
In the joining process,
The bow side connection portion and the rear end of the bow side hull portion are joined by welding,
The stern side connection part and the front end of the stern side hull part are joined by welding,
A method for manufacturing a ship, wherein the bow side piping and bow side wiring and the stern side piping and stern side wiring are respectively connected to the connection piping and the connection wiring. The method for manufacturing a ship according to claim 1, wherein the intermediate hull section includes some of the tanks arranged in an intermediate section in the bow and stern direction among the plurality of tanks arranged in the bow and stern direction.

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