JPH0740880A - Transport having double hull structure - Google Patents

Abstract

PURPOSE:To provide a transport by which stability can be enhanced in the hull having a double hull structure composed of an outside shell plating and an inside shell plating. CONSTITUTION:Both broadside space parts 4a and the double bottom space part 4b formed between an inside shell plating 3 and an outside shell plating 2 and 3 are communicated with each other. At the same time, plural communicating space chambers 4 having a U-shaped cross section are formed in the stern and bow direction by partitioning them by horizontal partition walls, and rectangular side part ballast tanks 11 are formed in intermediate positions corresponding to both broadsides of these communicating space chambers 4, and a bottom part ballast tank 12 is formed by communicating the column shape space parts 4c with the double bottom space part 4b in the communicating space chambers 4 in front and rear positions of the side part ballast tanks 11 on the respective broadsides.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport ship having a double hull structure.

[0002]

2. Description of the Related Art In recent years, in terms of safety, a transport ship for transporting liquid such as crude oil is composed of a hull outer plate and a hull inner plate, and a space chamber is formed between these hull outer plates. A double-hulled hull structure has been proposed.

As a ballast tank in such a transport ship, a space chamber formed between the inboard and outboard plates of the ship is used. That is, as shown in FIG.
A space chamber 53 is formed between 1 and the inboard plate 52, and a partition wall 54 is disposed in the bow-stern direction along the center line of the double bottom of the hull, to the left and right of the hull, Ballast tanks 55A and 55B each having a J-shaped cross section are formed.

Further, as shown in FIG. 3, the space chamber 63 formed between the hull outer plate 61 and the hull plate 62 does not have the partition wall 54 as shown in FIG. There is an integrated type in which the port side space portion 63a on the left and right sides and the double bottom space portion 63b communicate with each other, that is, used as a ballast tank 64 having a U-shaped cross section.

[0005]

According to the former structure described above, since the ballast tanks 55A and 55B are separated from each other on the left and right sides, for example, the damage is extended on one of the left and right sides of the hull and along the bow-stern direction. If it is hit, a large lateral tilting moment is generated, and there is a risk that the hull will capsize.

Further, according to the latter structure, when the hull is damaged, the ballast tank 64 is integrally formed over the entire cross section, so that the lateral tilting moment acting on the hull becomes small, but it is free. Due to the influence of the surface, the restoring force becomes very small, that is, the restoring performance deteriorates.

Therefore, an object of the present invention is to provide a transportation ship having a double hull structure which can solve the above problems.

[0008]

In order to solve the above problems, a transport ship having a double hull structure of the present invention is a hull having a double hull structure composed of a hull outer plate and a hull plate. And a space on the port side and a space on the bottom formed between the outer and inner plates of the ship, are communicated with each other, and are partitioned by a lateral bulkhead to form a plurality of transverse sections in the bow-stern direction. Forming a communication space chamber of the mold, forming a side ballast tank at an intermediate position corresponding to both port sides of the communication space chamber, and a columnar space part of the communication space chamber at the front and rear positions of the side ballast tank on each port side. To communicate with the bottom space to form a bottom ballast tank.

[0009]

According to the above construction, when the bottom of the hull is damaged, for example, the bottom ballast tank is flooded. Therefore, as in the conventional case, the J-shaped ballast tank whose cross section has a large space volume on one side is flooded. Unlike time, the lateral tilt moment becomes smaller. Also, unlike the conventional case of flooding a U-shaped ballast tank, the free surface is narrowed in the columnar space of the bottom ballast tank due to the presence of the side ballast tank, so that the apparent center of gravity is reduced. The rise is also very small, thus preventing the restoration performance from deteriorating.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes a hull of a transport ship having a double hull structure including a hull outer plate 2 and a hull inner plate 3 and a space chamber 4 formed between the inner and outer plates 2 and 3. .

In the space chamber 4 formed between the inboard and outer plates 2 and 3, the port-side space portion 4a and the double bottom space portion (bottom space portion) 4b communicate with each other, and a horizontal partition wall is provided. A plurality of (only one of which is shown in FIG. 1) transverse sections are defined as U-shaped communication space chambers divided by (not shown) in the bow-stern direction.

A rectangular side ballast tank 11 is formed at an intermediate position corresponding to both sides of the communication space chamber 4, and the communication space chambers at the front and rear positions of the side ballast tank 11 on each port side are formed. The columnar space portion 4c of 4 communicates with the double bottom space portion 4b to form the bottom ballast tank 12.

That is, the communication space chamber 4 having a U-shaped cross section
Is separately formed into a side ballast tank 11 formed on both sides of the port and a double bottom ballast tank (bottom ballast tank) 12 having the remaining columnar spaces 4c at the four corners thereof.

The columnar space 4c is also used as a trunk for access to the double bottom space 4b and for ventilation. In this configuration, for example, if the bottom of the hull 1 is damaged, seawater will flow into the double-bottom ballast tank 12, and therefore, as in the conventional case, a ballast tank having a J-shaped cross section with a large space volume on one side is used. Unlike the case of flooding, the lateral inclination moment becomes smaller. Further, unlike the conventional case of flooding a ballast tank having a U-shaped cross section, the free surface of the double bottom ballast tank 12 is narrowed due to the presence of the side ballast tank 11, that is, the area of the free surface. Is the horizontal cross-sectional area of the columnar space 4c, the rise of the center of gravity is very small, and therefore the restoration performance is prevented from being degraded.

Since the columnar space portions 4c at the four corners of the double bottom ballast tank 12 can be used as access trunks and ventilation trunks to the double low space portion 4b, separate access and ventilation trunks are provided. No need to provide.

[0016]

As described above, according to the configuration of the present invention, the communication space chamber having a U-shaped cross section formed between the hull outer plate and the hull plate is divided into a plurality of sections in the bow-stern direction. With
Since a side ballast tank is formed at an intermediate position between both sides of the divided communication space chamber, and a bottom ballast tank including columnar spaces at the front and rear positions of the side ballast tank is formed, for example, a hull If the bottom part is damaged, it will be flooded into the bottom ballast tank. Therefore, unlike in the case of flooding a J-type ballast tank with a large cross-sectional space on one side, the lateral inclination moment will be smaller than before. Also, unlike the conventional case of flooding a ballast tank with a U-shaped cross section, the presence of the side ballast tank narrows the free surface in the columnar space of the bottom ballast tank, increasing the apparent center of gravity. Is very small, and therefore, it is possible to prevent the restoration performance from deteriorating.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a hull structure of a transport ship according to an embodiment of the present invention.

FIG. 2 is a lateral cross-sectional view of a hull of a transportation ship in a conventional example.

FIG. 3 is a transverse cross-sectional view of a hull of a transportation ship in a conventional example.

[Explanation of symbols]

 1 Hull 2 Hull Outer Plate 3 Hull Inner Plate 4 Communication Space Room 4a Port Side Space 4b Double Bottom Space 4c Column Space 11 Side Ballast Tank 12 Double Bottom Ballast Tank

Claims (1)

[Claims] 1. A transport ship having a hull of a double-hull structure composed of a hull outer plate and a hull inner plate, and a space on both the port side and a bottom space formed between the hull outer and outer plates. Are communicated with each other, and are partitioned by a horizontal partition wall to form a plurality of U-shaped communication space chambers in the cross direction in the bow-stern direction, and the side portions are located at intermediate positions corresponding to both port sides of the communication space chambers. A double hull structure characterized by forming a ballast tank and forming a bottom ballast tank by communicating the columnar space portion of the communication space chamber at the front and rear positions of the side ballast tank on each port side with the bottom space portion. A transport ship having.