JP2000142560A - Ore/sulfuric acid carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ore/sulfuric acid carrier having an economical hull structure. SOLUTION: For example, five holds 5 are formed in the longitudinal direction of a hull 1, each hold 5 is divided into three parts in the breadth direction of the hull to form a center hold chamber 7, and right and left side hold chambers 8, the center hold chamber 7 is used for loading ores, the side hold chambers 8 are used for loading sulfuric acid, longitudinal bulkheads 6 to demarcate the center hold chamber 7 from the side hold chambers 8 are inclined so that the upper breadth in the side hold chambers 8 is smaller than the lower breadth, and either ores or sulfuric acid is loaded during the navigation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ore and sulfuric acid carrier.

[0002]

2. Description of the Related Art Ores are usually transported from abroad to ore by ore carriers, and conversely, sulfuric acid is transported from abroad by sulfuric acid carriers. For one-way transportation, the hold is empty. And was uneconomical.

[0003] For this reason, ore and sulfuric acid carriers are used in which ore and sulfuric acid are transported by one ship. Conventionally, this ore / sulfuric acid carrier has, as shown in FIG. 4, provided in its hull 51, for example, five holds 52 in the bow direction, and ore and sulfuric acid alternately among these holds 52. And are loaded. For example, the first, third and fifth holds have ores,
The second and fourth holds were loaded with sulfuric acid.

[0004]

According to the structure of the conventional carrier described above, each hold is formed almost completely to the ship side outer plate in the width direction of the hull, so that the volume per hold is extremely low. Become larger. For this reason, even if the load is loaded alternately, when the hull strength is considered, the design is performed based on the maximum load loaded in the hold. Therefore, when the ore or sulfuric acid is loaded in the entire hold, whichever is greater is used as the design load,
Was uneconomical.

Accordingly, an object of the present invention is to provide an ore / sulfuric acid carrier having an economical hull structure.

[0006]

In order to solve the above problems, an ore / sulfuric acid carrier of the present invention forms a plurality of holds in the bow and stern direction, and each of these holds is formed in the hull width direction. The central hold room and the left and right side hold rooms are formed by dividing into three, and the central hold room is used for loading ore, and the side hold room is used for loading sulfuric acid. In the above-mentioned transport ship, the wall part that partitions the side hold room and the center hold room is inclined such that the upper width of the side hold room is smaller than the lower width. It is.

According to the configuration of the ore / sulfuric acid carrier described above, each hold is divided into three in the width direction of the hull, and the center hold room is used for loading ore, and both side hold rooms are used for loading sulfuric acid. Since either one is loaded, the load weight in the same hold is reduced as compared with the case where only one type of cargo is loaded without partitioning the hold, and therefore the economical hull structure is reduced. Can be adopted.

In addition, since the wall portion defining the center hold room and the side hold room is inclined so that the upper width of the side hold room is smaller than the lower surface width, the specific gravity of the side hold room is reduced. Even when sulfuric acid having a large load is loaded, the second moment of the liquid level can be reduced, so that the stability of the ship is improved and the influence of sloshing can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ore and sulfuric acid carrier according to an embodiment of the present invention will be described below with reference to FIGS.

1 and 2, reference numeral 1 denotes a hull of an ore / sulfuric acid carrier having a double hull structure including an outer plate portion 2 and an inner plate portion 3 and having an inner space portion formed therein. The outer space is used mainly for loading ballast water for loading cargo.

[0011] In the bow direction of the hull 1,
A plurality of, for example, five holds 5 are formed by the horizontal partition 4, and each hold 5 has a width of 3 in the hull width direction.
It is divided into individual hold rooms.

That is, in each hold 5, a vertical partition wall (wall portion) provided at the left and right positions in the vertical direction (the bow and stern direction).
According to 6, the center hold room (also called center hold)
7 and left and right side hold rooms (also called wing tanks) 8
Are formed, and the center hold room 7 is used for loading ore, and both side hold rooms 8 are used for loading sulfuric acid. Of course, the surface of the side hold room 8 is made of stainless steel, and no stiffener is provided on the inner surface thereof to facilitate maintenance and inspection. The stiffener is provided on the outside.

In mounting sulfuric acid having a large specific gravity, consideration is given to the effect of the free surface area as much as possible. That is, the vertical bulkheads 6 provided in each hold a 5, as shown in FIG. 3, than the lower portion of the mounting width (opening width) L ₁ with respect to the outer plate portion 2, an opening width of the upper side attachment as towards the width L ₂ is shorter, it is provided obliquely.

Here, a comparison of the second moment of the free surface (when 98% is full) between the case where sulfuric acid is loaded in the center hold room 7 and the case where sulfuric acid is loaded in the side hold room 8 is as follows. become.

(A) When the cargo is loaded in the center hold room Upper width → 16.00 m Upper length → 26.00 m Second moment coefficient of liquid level = (26.00 x 16.00)
³ ) x (1/12) = 8874m ⁴ (b) When loaded in the side hold room (two on each side) Upper width → 5.50m Upper length → 26.00m Second moment coefficient of liquid level = 2 × (26.00 × 5.5
0 ³ ) × (1/12) = 721 m ⁴ As described above, the secondary moment when loaded in the hold room 8 on both sides is 1 / compared to the secondary moment when loaded in the center hold room 7. It is about 12 and the stability is greatly improved.

As described above, the outer space of the hull 1 is used for loading ballast water, and ballast water tanks 11 are formed on the side and below the side hold room 8. At the same time, a fuel tank 12 is formed below the center hold room 7.

By arranging the fuel tank 12 below the center hold room 7, the fuel tank 12 and the side hold room 8 on which sulfuric acid can be loaded can be provided at a completely separated position. To meet international safety regulations on ships.

Although it is determined that sulfuric acid and water are not loaded adjacent to each other, when loading sulfuric acid, there is a problem in that the ballast tank 11 is completely empty. Does not occur.

Furthermore, since the ore is loaded in the center hold room 7, the hatch 21 for unloading the ore is provided.
Is sufficient, for example, when loading in each side hold room 8, the cargo handling efficiency is better than that in which two hatches on the left and right are required.

[0020]

As described above, according to the configuration of the ore / sulfuric acid carrier of the present invention, each hold is divided into three, and the center hold room is used for loading ore, and both side hold rooms are used for loading sulfuric acid. ,
At the time of navigation, either one is loaded, so the loading weight in the same hold is reduced as compared to the case where only one type of cargo is loaded without partitioning the hold, so the hull structure Will be economical.

[0021] Further, since the wall portion defining the center hold room and the side hold room is inclined so that the upper width of the side hold room is smaller than the lower surface width, the specific gravity of the side hold room is reduced. Even when sulfuric acid having a large load is loaded, the second moment of the liquid level can be further reduced, so that the stability of the ship can be improved and the influence of sloshing can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an ore / sulfuric acid carrier according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the ore / sulfuric acid carrier.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view of a conventional ore / sulfuric acid carrier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 4 Horizontal bulkhead 5 Hold 6 Vertical bulkhead 7 Central hold room 8 Side hold room 11 Ballast water tank 12 Fuel tank

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[Procedure amendment]

[Submission date] September 9, 1999 (1999.9.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

In order to solve the above problems, an ore / sulfuric acid carrier of the present invention forms a plurality of holds in the bow and stern direction, and each of these holds is formed in the hull width direction. Forming a central hold room and left and right side hold rooms, and using the central hold room for ore loading, and using the side hold room for sulfuric acid loading, Furthermore, the above-mentioned side hold room
The wall that separates the
Tilt so that the width of the upper part is smaller than that of the lower part
It is a thing.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tsuyoshi Makihata 6 at 226 Ojizawa, Setoda-cho, Toyota-gun, Hiroshima Prefecture Inside Utsumi Shipbuilding Co., Ltd. (72) Inventor Hiroshi Shioya 6-226 Odaizawa, Setoda-cho, Toyota-gun, Hiroshima Prefecture Utsumi Shipbuilding Co., Ltd.

Claims (2)

[Claims] (1) A plurality of holds are formed in a bow and stern direction, and each of the holds is formed in a hull width direction.
The central hold room and the left and right side hold rooms are divided into three, and the central hold room is used for loading ore, and the side hold room is used for loading sulfuric acid. An ore / sulfuric acid carrier ship characterized by the following. 2. A wall portion defining a side hold room and a center hold room is inclined so that an upper width in the side hold room is smaller than a lower width. Claim 1
The ore and sulfuric acid carrier described.