JPH06321175A - tanker - Google Patents

Abstract

PURPOSE:To provide a tanker capable of extremely reducing the probability of the damage of the bottom part of an oil tank in the bow part at stranding. CONSTITUTION:In a tanker 1 in which vertical bulkhead plates 3 extended substantially vertically from an upper deck to a bottom outer plate are provided on the inside of both side outer plates 5 with a determined space, ballast tanks 6 are partitioned and formed on both the side parts, and an oil tank 4 is partitioned and formed between the insides of the ballast tanks 6, the vertical bulkhead plates 3 are formed in such a manner as to be closer to the axial central line as it is closer to the bow side, and the ballast tanks 6 having sectional areas successively extended toward the bow side are formed on both outsides of the oil tank 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tanker, and more particularly to a tanker having a ballast tank formed by sandwiching a freight oil tank inside.

[0002]

2. Description of the Related Art In general, as shown in FIG. 5, a tanker 1 is a vertical bulkhead extending from a deck 2 to a bottom outer plate 7 at a predetermined distance inside the outer plates 5 on both sides. The plate 3 is provided, and the vertical partition plates 3 and 3, the side outer plate 5, and the upper deck 2 are provided.
And the ballast tanks 6 which are defined by the outer shell plate 7 and are formed on both sides, respectively, and the ballast tanks 6
It is known to have a freight oil tank 4 that is sandwiched between the insides of the two sides and is divided by the vertical partition wall plate 3, the upper deck 2 and the ship bottom outer plate 7. The ballast tank 6 is filled with seawater in a predetermined amount according to the amount of heavy oil such as heavy oil stored in the oil tank 4, and the ship itself is secured with appropriate weight to ensure the stability of the hull. To do. Further, as shown in FIG. 4, the freight oil tank 4 and the ballast tank 6 are also arranged in the ship axis direction.
A plurality of horizontal bulkhead plates 10 are provided so that the tanker 1 is divided into two parts and is stretched over the port-side outer plates 5, whereby the tanker 1 has a plurality of currency oil tanks 4 and ballast tanks 6 in the vessel axial direction. This type of tanker 1 is generally widely known as a single hull type.

By the way, in the example shown in the figure, the freight oil tank 4 and the ballast tank 6 thus divided are formed by dividing the freight oil tank 4 into five parts in the axial direction of the vessel. -1,4-2,4-3,4-4,4-5, and similarly, these ballast tanks 6 will be referred to as ballast tanks 6-1,6-2,6-3,6-4,6-5.

Further, particularly in the bow portion 8 of the tanker 1, the side skins 5 on both sides are drawn in an arc shape centered on the axis of the boat and extend in the bow direction and are connected to each other by the bow 9, and the arc is hung. A vertical bulkhead plate 3-1 for partitioning the freight oil tank 4-1 and the ballast tank 6-1 is provided substantially parallel to the string to be passed (indicated by an imaginary line a), and the bow end 11 of the vertical bulkhead plate 3-1 is provided on the horizontal bulkhead plate 10. It is formed by being connected. As a result, the ballast tank 6-1 on the port side is formed such that the cross-sectional area cut along the port side is substantially constant toward the bow 9 side. Further, the freight oil tank 4-1 is formed so that the cross-sectional area cut by the port side is reduced toward the bow 9 side.

A portion having a substantially triangular cross section formed near the bow 9 by the lateral bulkhead plate 10 and the side outer plate 5 is used as a forepeak tank 12 and is appropriately filled with seawater to balance the hull in the pitching direction. Is to take.

[0006]

By the way, an accident such as a stranding may sometimes occur while a tanker is transporting freight oil, and at this time, a rupture hole is formed at the bottom of the freight oil tank (outer shell plate). Oil may leak out. Especially in view of past statistics, it is overwhelmingly frequent that the ship runs aground while moving forward and a rupture occurs in the bottom plate of the bow.

On the other hand, as shown in FIG. 4, according to the above,
In the bow portion 8, the vertical partition plate 3-1 is provided substantially in parallel with the chord a which bridges the arc formed by the side outer plates 5 on both sides. Conventionally, the vertical partition plate 3-1 is formed in this manner only in accordance with the arc formed by the side outer plates 5 on both sides, and has no particular reason. And in this way vertical partition plate 3-1
Inevitably, the ballast tanks 6 on both sides of the ship have a substantially constant cross-sectional area cut by the port side toward the bow 9 side, and the freight oil tank 4 has the cross-sectional area cut by the port side on the bow 9 side. It is reduced toward. However, the ballast tank 6 and the freight oil tank 4, which are partitioned by the vertical partition plate 3, are arranged in such a manner that the resilience of the hull can be secured at the time of grounding, but It is not intended to positively avoid damage to the bottom of the tank 4.

Therefore, the present inventor has paid attention to this point and devised the present invention by thinking that the probability of the oil oil spill due to an accident can be dramatically reduced depending on the shape of the oil tank at the bow. It is an object of the present invention to provide a tanker capable of dramatically reducing the probability of damage to the bottom of the oil tank at the bow even when it is aground.

[0009]

In order to achieve the above-mentioned object, the present invention provides a vertical partition plate extending substantially vertically from the upper deck to the ship bottom skin at a predetermined distance inside the port side skins. In a tanker in which ballast tanks are formed on both sides of the port and the oil tanks are formed by sandwiching them inside the ballast tanks, the vertical bulkhead plate is formed to be closer to the center line of the axis as it approaches the bow side. However, ballast tanks having cross-sectional areas that are sequentially enlarged toward the bow side are formed on both outer sides of the freight oil tank.

[0010]

According to the above construction, the cross-sectional area of the freight oil tank in the bow can be further reduced as compared with the conventional case, and the bottom area of the freight oil tank in the bow can be reduced accordingly. The probability of damaging the bottom of the tank can be greatly reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 5, the tanker 1 has vertical partition walls extending from the upper deck 2 substantially vertically to the bottom shell plate 7 at predetermined intervals inside the outer shell plates 5 on both sides. A plate 3 is provided. Therefore, the tanker 1 is a vertical partition plate 3,
Ballast tanks 6 defined by the side outer plate 5, the upper deck 2 and the ship bottom outer plate 7 and formed on the respective port sides, and the vertical bulkhead plates 3 on both sides of the ballast tanks 6 sandwiched between the ballast tanks 6 and the upper deck 2 And a cargo oil tank 4 defined by the bottom plate 7 of the ship. The ballast tank 6 is filled with seawater in a predetermined amount according to the amount of heavy oil such as heavy oil stored in the oil tank 4, and the ship itself is secured with appropriate weight to ensure the stability of the hull. To do. Further, as shown in the figure, a horizontal bulkhead plate 1 that partitions the freight oil tank 4 and the ballast tank 6 also in the vessel axis direction and is hung on the port side outer plates 5
The tanker 1 has a plurality of currency oil tanks 4 and a plurality of ballast tanks 6 in the boat axis direction.

By the way, in the illustrated example, the freight oil tank 4 and the ballast tank 6 thus divided are formed by dividing the freight oil tank 4 into five parts in the axial direction of the vessel. -1,4-2,4-3,4-4,4-5, and those ballast tanks 6 will be ballast tanks 6-1,6-2,6-3,6-4,6-5.

Further, in particular, in the bow portion 8 of the tanker 1, the side outer plates 5 on both sides are drawn in an arc shape centered on the axis of the boat and extend in the bow direction and are connected by a bow 9, and the arc is bridged. The oil tank 4-1 and the ballast tank 6-1 are drawn so as to be closer to the center line of the ship axis than the direction of the string (shown by the imaginary line a) and to draw an arc opposite to the arc drawn by the side outer plate 5. Vertical partition board 3-
1 extends obliquely in the bow direction, and their bow ends 11 are formed so as to be adjacent to each other and connected to the transverse bulkhead plate 10. In addition, a vertical partition wall plate 3- that separates the cargo oil tank 4-2 and the ballast tank 6-2 by drawing a continuous arc to the arc drawn by the vertical partition wall plate 3-1.
2 is formed, and the vertical bulkhead plate 3-2 is connected to the vertical bulkhead plate 3 on the stern side. As a result, the ballast tanks 6-1 and 6-2 on the port side are formed such that the cross-sectional area cut along the port side is gradually enlarged toward the bow 9 side. Also the oil tank 4-
1,4-2 will be formed so that the cross-sectional area cut by the port side is extremely reduced toward the bow 9 side.

A portion having a substantially triangular cross section formed near the bow 9 by the lateral bulkhead plate 10 and the side outer plate 5 is used as a forepeak tank 12 and is appropriately filled with seawater to balance the hull in the pitching direction. Is to take.

Next, the operation of this embodiment will be described.

According to the above, in particular, in the bow portion 8, the ballast tanks 6-1 and 6-2 on both port sides are formed such that the cross-sectional areas cut by the port side are gradually enlarged toward the bow 9 side, and these ballasts are formed. The cross-sectional area of the freight oil tanks 4-1 and 4-2 sandwiched between the tanks 6-1 and 6-2 cut along the port side is extremely reduced toward the bow 9 side. As a result, the bottom area of the oil tank 4 at the bow 8 can be significantly reduced as compared with the conventional case. Further, in this embodiment, the vertical partition plate 3-2 is used as the oil tanks 4-2 and 4-3 or the ballast tank 6-.
It is provided so as to be inclined from the connecting portion of the horizontal bulkhead plate 10 for partitioning 2 and 6-3 and to extend toward the bow side, thereby reducing the bottom area of the oil tank 4-2. Even if an accident such as a stranding occurs while the tanker 1 is moving forward, the probability of damaging the bottom of the oil tank 4 of the bow 8 that is most vulnerable to damage can be greatly reduced. Spills can also be prevented in advance.

Incidentally, when the freight oil tank 4 of the bow portion 8 is formed in this manner, the internal capacity thereof is also reduced, but the freight oil tank 4 on the stern side of the bow portion 8, that is, the freight oil tanks 4-3, 4-. The problem can be easily solved by taking measures such as narrowing the interval between the vertical partition plate 3 and the side outer plate 5 so as to increase the internal capacity of 4,4-5.

Next, a modified embodiment of the present invention will be described.

First, in the first modified embodiment, as shown in FIG. 2, in the bow portion 8, the bow end portions 11 of the vertical bulkhead plates 3-1 are close to each other and the horizontal bulkhead plate 10 is provided. In addition to being connected, the vertical bulkhead plates 3-1 and 3-2 linearly extend in the diagonal stern direction and are connected to the vertical bulkhead plate 3 on the stern side. This also makes it possible to reduce the bottom area of the freight oil tank 4 in the bow portion 8 and achieve the same effect as above.

Next, in the second modified embodiment, as shown in FIG. 3, in the bow portion 8, the bow end portions 11 of the vertical bulkhead plates 3-1 are close to each other, and the horizontal bulkhead plate 10 is provided. The vertical bulkhead plate 3-1 extends linearly in the oblique stern direction at a smaller angle with respect to the ship axis, and the vertical bulkhead plate 3-2 is connected to the vertical bulkhead plate 3-1.
With a larger angle to the ship axis, the vertical bulkhead plate 3-
It is formed by connecting 1 and the vertical partition plate 3 in the stern direction. Even in this case, the bottom area of the freight oil tank 4 in the bow portion 8 can be reduced, and the bottom portion can be prevented from being damaged at the time of stranding.

[0022]

The present invention exhibits the following excellent effects.

(1) The probability of damage to the bottom of the cargo oil tank at the bow at the time of a grounding can be reduced as much as possible, and the leak of cargo oil can be prevented.

(2) The structure is simple and versatile.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of a tanker according to the present invention.

FIG. 2 is a top view showing a modified embodiment of the tanker according to the present invention.

FIG. 3 is a top view showing a modified embodiment of the tanker according to the present invention.

FIG. 4 is a top view showing a conventional example.

FIG. 5 is a cross-sectional view of a conventional example taken along the port side.

[Explanation of symbols]

 1 Tanker 2 Upper deck 3 Vertical partition wall plate 4 Oil tank 5 Side shell plate 6 Ballast tank 7 Bottom shell plate

Claims (1)

[Claims] 1. A vertical partition wall plate extending substantially vertically from a top deck to a ship bottom skin at a predetermined interval is provided inside the outer shells of both sides, and ballast tanks are defined and formed on both sides of the ship. In the tanker in which the freight oil tank is defined by sandwiching it inside, the vertical partition plate is formed so as to be closer to the center line of the axis as it is closer to the bow side. A tanker formed by forming a ballast tank having an enlarged cross-sectional area.