JPH0733151B2 - Ship - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship, and more particularly to a cargo ship having a cargo hold.

2. Description of the Related Art A conventional ship has a long and narrow shape with a length of 5 times or more the ship width, and its cargo hold is almost a hollow quadrangular prism.

Problems to be Solved by the Invention As described above, since the conventional cargo hold of a ship has a hollow quadrangular prism shape, it receives internal and external pressures on a flat surface, so that the outer plates and partition walls have bones such as ribs. The material must be stretched horizontally and vertically. Therefore, there is a problem that it is difficult to reduce the ship price due to an increase in the weight of steel material and an increase in processing man-hours. The present invention is intended to solve such a problem. That is, it is an object of the present invention to provide a vessel that can significantly reduce the construction cost, particularly the construction cost of a low-speed bloated ship or the like, and that does not significantly deteriorate the propulsion performance.

Means for Solving Problems The outer shape of the cargo hold was made upright cylindrical, and the stern was formed toward the stern from a position not behind the flow separation point in the cylinder. That is, the structure of the ship of the present invention, the outer plate of the cargo hold is upright cylindrical type,
And, it has a starboard stern outer plate and a port stern outer plate respectively provided from the outer plate of the cargo hold toward the stern, and further, the outer plate of the cargo hold in the submerged part and the starboard stern plate and port starboard. The joints of the stern skins are not located behind the flow separation point of the outer skin of the cargo hold, and a part of the outer skin of the cargo hold doubles as the outer skin of the hull. I am trying.

Action As the outer plate of the cargo hold is upright cylindrical type,
The cylindrical structure is extremely advantageous in strength as compared with the flat plate structure, and can significantly reduce the weight of the hull and the number of processing steps. Also, since the joints of the cargo hold shell plate and starboard stern skin and port starboard skin at the submerged part are not behind the flow separation point of the cargo hold shell plate, the flow separation The viscous pressure resistance does not increase so much.

Embodiment The drawings show an embodiment of the present invention. In the drawing,
1 is a cargo hold, 2 is an outer plate of the cargo hold 1, 3 and 4 are flow separation points of the cylindrical portion of the outer plate 2 (center angle θ in FIG. 3 is about 130 degrees), 5 is outside of the starboard stern Board, 6 port stern outer plate, 7 water surface (full load line), 8 living area,
9 is a chimney, 10 is a main engine, 11 is a propeller, and 12 is a rudder.
That is, the outer plate 2 of the cargo hold 1 has an upright cylindrical shape, and has a starboard stern outer plate 5 and a port stern outer plate 6 which are respectively provided from the outer plate 2 of the cargo hold 1 toward the stern. ing. Further, in this embodiment, the joints of the outer plate 2 of the cargo hold 1 with the starboard stern outer plate 5 and the port stern outer plate 6 at the submerged portion are both in the cargo hold 1.
Although the flow separation points 3 and 4 of the outer plate 2 are located at the positions, the joining points may be located slightly in front of the respective separation points 3 and 4.

In the ship configured as shown in the figure, since the outer plate 2 of the cargo hold 1 is an upright cylindrical type, the cylindrical structure is extremely advantageous in strength against internal and external pressures as compared with the structure of a flat plate. In addition, the weight of the hull can be greatly reduced, and because it is a very simple cylindrical shape, it is easy to design and manufacture, and labor costs can be greatly reduced. Moreover, even if the amount of drainage is the same, the area of the outer plate 2 is 10 to 10
It is 15% smaller, which also reduces the weight of the hull. Moreover, the area below the water surface 7, that is,
The flooded area is also reduced by 8-12% and the frictional resistance is reduced accordingly. The separation points 3 and 4 of the cylindrical flow in the turbulent flow are located at the center angle θ (about 130 degrees) from the front end, and the starboard stern skin 5 and the port stern skin 6 are separated by the separation points 3 and 4.
Since they are formed toward the stern from positions not behind 4 and 4, flow separation is prevented, and there is almost no increase in viscous pressure resistance. The wave resistance increases at high speeds, but the speed of voyage slows in recent low-speed, large-sized ships such as cargo ships.If applied to such low-speed ships, the ratio of wave resistance increases. Is extremely small, and the amount of increase is small.

EFFECTS OF THE INVENTION In the ship of the present invention, the outer plate of the cargo hold is an upright cylindrical type, and a part of the outer plate of the cargo hold doubles as the outer plate of the hull, so that it is described in the above embodiment. As described above, it is possible to significantly reduce the weight of the hull, facilitate designing and manufacturing, and significantly reduce the construction cost. In addition, since the joints of the cargo hold skin and starboard stern skin and port stern skin in the submerged part were not located behind the flow separation point of the cargo hold skin, the separation of the flow was There is almost no increase in viscous pressure resistance, and therefore propulsion performance is not significantly deteriorated.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a cross-sectional plan view taken along the section line AA of FIG.
FIG. 3 is a sectional plan view taken along the section line B-B. 1 ... Cargo hold, 2 ... Cargo hold skin,
3, 4 …… Flow separation point, 5 …… Starboard stern skin, 6 ……
Port stern skin, 7 ... water surface.

Claims (1)

[Claims] 1. A cargo hold outer plate is an upright cylindrical type, and has a starboard stern outer plate and a port stern outer plate respectively provided from the outer plate of the cargo hold toward the stern, and , The joint of the outer shell of the cargo hold with the starboard stern outer shell and the starboard stern outer shell in the submerged part is not behind the flow separation point of the outer shell of the cargo hold, and the cargo is A ship characterized in that part of the outer skin of the hold also serves as the outer skin of the hull.