JPS646998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for converting a two-shaft ship into a single-shaft ship.

In ships, especially high-speed ships such as container ships,
Two axes may be changed to one axis to reduce speed, save energy, etc.

In this way, when changing a two-shaft ship to a single-shaft ship,
Previously, the stern structure, including the bossing structure, had to be replaced, and the outer hull plating above it had to be replaced as well. However, in the case of such a conventional remodeling method, since the replacement work covers a fairly wide area, the remodeling cost is high and the construction period is long.

In view of the above-mentioned circumstances, the present invention has been developed to minimize the scope of modification of the aft structure of an existing ship by relocating and reusing the existing bossing structure, shafting, etc., and to minimize the cost of modification. This relates to a method of converting a two-shaft ship to a single-shaft ship for the purpose of

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show the rear part of the hull of an existing two-shaft ship, where 1 is the hull outer plate, 2 is the bossing that holds the propeller shaft 4 to which the propeller 3 is attached, 5 is the skeg, and 6 is the rudder. .

In the remodeling method of the present invention, first, the rear end of the skeg 5 is cut using a cutting machine A, and the rear end of the skeg for relocation 5a is
Then, one of the left and right bossings 2 (the right side in FIG. 2) is cut along the cutting line B and also temporarily removed for relocation. In this case, if the axial or circumferential dimension of the transfer bossing 2 is insufficient, the other bossing 2 may be used as appropriate to combine (add). Subsequently, the other bossing 2 and the outer panel 1a around the bossings 2 and 2 are cut and removed along cutting lines C ₁ and C ₂ over a required range.

Incidentally, in the above process, the cutting work on the cutting lines A and B may be performed after the switching work on the cutting lines C ₁ and C ₂ is completed.

After that, as shown in FIGS. 3 and 4, the new skin members 7, 7 are cut along the cutting line after removing the skin 1a portion.
C ₁ and C ₂ are joined from the left and right in a downward direction toward the center of the hull (in an inverted V shape). The relocated bossing 2 is joined and positioned on the centerline of the hull. In short, the order of cutting and the order and method of assembling and attaching described later do not matter. Incidentally, the propeller shaft 4 held by the relocation bossing 2 may be a newly installed one. Furthermore, since the newly installed outer panel members 7, 7 are located on the vacuum side of the water flow leading to the propeller, they have a fair curved shape for the purpose of preventing the generation of vortices. Furthermore, the rear end portion 5a of the relocation skeg, which has been temporarily removed, is joined to the lower surface of the relocation boshing 2. The rear end portion 5a of the skeg to be relocated and used may be partially modified for use in a new single-shaft ship. This joint has a simple joint structure because the water flow that reaches the propeller is on the pressure side. Further, the gap formed between the anti-propeller side (bow side) portion of the relocation bossing 2 and the outer plate 1 is closed by newly installed closing outer plate members 8, 8. A propeller 9 for a single-shaft boat is attached to the propeller shaft 4. Note that the propeller 3 can also be used as the propeller 9. On this occasion,
In order to maintain a required clearance between the propeller 9 and the outer plate above the propeller 9, measures such as appropriately curving the lower portions of the outer plate members 7, 7 are taken.

Note that each joint is indicated by a thick broken line in FIG. 3 and by a black circle in FIG. 4.

In the manner described above, a two-shaft ship can be converted into a single-shaft ship.

According to the method of converting a two-shaft ship to a single-shaft ship of the present invention, structures such as botting and skeg can be relocated and used, and parts to be cut and removed and newly installed parts can be kept to the minimum necessary. This has the excellent effect of minimizing costs.

[Brief explanation of drawings]

Fig. 1 is a side view of the rear part of the hull of a two-shaft ship, Fig. 2 is an enlarged view in the direction of Fig. FIG. 4 is a side view of the rear part of the hull showing a modified state of the ship, and FIG. 4 is an enlarged view taken in the direction of the arrows in FIG. 3. 1... Outer panel, 2... Botting, 5... Skeg, 5a... Skeg rear end, 7... New outer panel member.

Claims (1)

[Claims] 1. Cutting and removing the bossing located on both sides of the rear hull of the two-shaft ship, the outer plate part around the outer periphery of the bossing, and the required part of the skeg, and making the said bossing alone or in combination for relocation, and also the required part of the skeg. It was temporarily removed for relocation,
After that, a new outer panel member is attached to the hull outer panel section that has been cut and removed, and then the relocation bossing is joined to the lower end of the new outer panel member so that it is located on the hull centerline, and the relocated bossing is A method for converting a two-shaft ship to a single-shaft ship, characterized in that a necessary part of the relocation skeg is provided on the lower surface portion to make the ship a single-shaft ship.