JP2006103506A - Hull structure for automobile carrying vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hull structure for an automobile carrying vessel capable of sufficiently ensuring hull strength to racking deformation, without disturbing cargo handling on board a ship. <P>SOLUTION: In the hull structure for the automobile transporting ship equipped with a web frame 10 arranged in a hull lateral direction of the automobile carrying ship 1, the web frame 10 is structured to have a box-shaped cross-section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hull structure of a car carrier (PCC), which is a transport ship dedicated to automobiles.

Conventionally, an automobile carrier (see FIG. 4) for carrying an automobile exclusively is known. Since this type of vehicle carrier 1 generally has a tall hull structure, it is necessary to ensure sufficient strength against racking deformation of the hull side wall 2. For this reason, in the hull structure of the automobile carrier 1, for example, as shown in FIG. 5, a skeleton member generally called a web frame is provided.
The illustrated conventional web frame 3 is a wall-shaped member that is erected long (deeply) toward the center in the transverse (width) direction of the hull of the car carrier 1 and is also called a deep web frame. In the example shown in the drawing, three places are arranged symmetrically with appropriate intervals in the longitudinal (longitudinal) direction of the hull of the car carrier 1. In addition, the code | symbol 4 in a figure is a deck and 5 is a floor board.

Some hull structures of car carriers have conventionally provided a partition wall under the boarding deck to cope with racking deformation. Since this bulkhead narrows the moving passage of the automobile and causes the cargo handling rate to be remarkably deteriorated, a hull structure has been proposed in which the bulkhead efficiency is improved by eliminating this bulkhead. (For example, see Patent Document 1)
JP 2003-170887 A

As described above, in the hull structure of the automobile carrier 1, the web frame 3 provided as a countermeasure against the racking of the tall hull side wall 2 protrudes toward the center of the hull, leaving a relatively small opening area, and a vehicle loading space. It becomes a wall member which divides in the longitudinal direction. The presence of such a wall member is not preferable because the passage for moving the loaded automobile in the loading space in the ship is narrowed, which causes a reduction in the efficiency of the cargo handling operation.
Further, the web frame 3 described above needs to be reinforced by providing a large bracket 6 at the corner on the lower end side, for example, as shown in FIG. 6 in order to ensure sufficient fatigue strength against racking. The area is further narrowed, which hinders cargo handling work.
Furthermore, considering sufficient fatigue strength against racking, for example, a sufficient area cannot be secured for the wall surface opening 7 provided in a watertight bulkhead or the like that partitions the lower part of the hull. For this reason, the moving path of the automobile is narrowed, and the efficiency of the cargo handling work is also lowered, which is not preferable.

In this way, in the automobile carrier 1 that requires countermeasures against racking deformation due to its tall hull structure, a large opening area is obtained so as not to hinder cargo handling work in the ship, and sufficient for racking deformation. A hull structure that can ensure strength is desired.
The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a hull of an automobile carrier ship that can sufficiently ensure hull strength against racking deformation without hindering cargo handling work in the ship. To provide a structure.

In order to solve the above problems, the present invention employs the following means.
The hull structure of an automobile carrier according to the present invention is characterized in that in the hull structure of an automobile carrier provided with a web frame disposed in a transverse direction of the hull, the web frame has a box cross-sectional structure. Is.

  If the hull structure of such an automobile carrier ship is used, the web frame has a box cross-sectional structure, so that the amount of protrusion in the center direction of the hull can be reduced and sufficient strength can be obtained compared to the wall type. .

  In the above invention, it is preferable to use the internal space of the box cross-sectional structure as a ventilation flow path, thereby effectively utilizing the internal space of the box cross-sectional structure and eliminating the installation space dedicated to the ventilation flow path. Therefore, the loading efficiency is improved by increasing the effective volume that can be secured in the cargo space on the ship.

According to the hull structure of the automobile carrier of the present invention described above, since the web frame has a box cross-sectional structure, the amount of protrusion in the center direction of the hull can be reduced and sufficient strength can be obtained. For this reason, the opening area of the web frame installation part that divides the loading space in the ship in the longitudinal direction can be increased (the frontage is widened). A remarkable effect is obtained.
In addition, if the internal space of the box cross-section structure is used effectively as a ventilation channel, the cargo space on the ship increases by the installation space of the ventilation channel, the number of vehicles that can be loaded increases, and the loading efficiency increases. Can be improved.

Hereinafter, an embodiment of the hull structure of a car carrier according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part same as the conventional structure of FIG. 5 mentioned above, and the detailed description is abbreviate | omitted.
FIG. 1 is a horizontal sectional view showing a schematic configuration of a first embodiment relating to a hull structure of an automobile carrier ship. An automobile carrier (hereinafter referred to as “hull”) 1 has a structure in which an outer plate, a deck, and the like are attached to a skeleton formed by combining various frame members. Among such frame members, there is a web frame 10 having a box cross-sectional structure provided for the purpose of ensuring sufficient strength against racking deformation of the hull side wall 2. In the following description, the longitudinal (longitudinal) direction is the traveling direction or the front-rear direction in which the hull 1 moves forward or backward, the lateral direction is the width direction of the hull 1, and the vertical direction is the height direction of the hull 1. That is.

The web frame 10 is a strength member having a hollow box cross-sectional structure in which two rectangular cross-sections are arranged in the longitudinal direction of the hull 1 and extending in the vertical direction along the hull side wall 2 of the hull 1. In the illustrated example, three web frames 10 are arranged on the left and right hull side walls 2 (total of six locations) at appropriate intervals in the vertical direction of the hull 2. In addition, about the installation location of the web frame 10, it changes suitably according to the dimension of the hull 1, a shape, etc.
The rectangular cross section of the web frame 10 is formed by connecting a frame member having a substantially Y-shaped cross section provided with an intermediate partition plate 10 b for dividing the concave member 10 a to the hull side wall 2. The box cross-sectional shape in this case may be set so that the cross-section coefficient is equal to or greater than that of the wall-type deep web frame as the conventional technique in the hull 1 having the same input conditions for racking deformation and the like.

Moreover, it is preferable that the web frame 10 having a box cross-sectional shape secures a desired section modulus and minimizes the dimension Wf protruding in the lateral direction of the hull 1.
This facilitates the movement of the vehicle, which is a load, on the ship by ensuring the maximum distance (frontage) W between the opposing surfaces of the web frame 10 that is arranged symmetrically on the inner wall surface of the hull side wall 2. This is to improve the efficiency of cargo handling work. In other words, in the loading space of the hull 1, the provision of the web frame 10 having the box cross-sectional shape does not significantly narrow the frontage W that defines the passage width, and therefore the automobile travels and moves in the ship. Sufficient passage width can be secured and efficient cargo handling work can be performed.

By the way, the loading space of the hull 1 has a multi-level structure partitioned by the floor board 5, but ventilation is necessary for each level of the loading space. Since the conventional hull 1 is provided with a dedicated ventilation duct (ventilation flow path), securing such a duct installation space reduces the effective volume in which an automobile can be loaded.
Therefore, the above-described web frame 10 is effectively used, and the internal space of the box cross-sectional shape is used as a ventilation channel. That is, for the web frame 10 provided through each level of the loading space, an opening that communicates with each level of the loading space is provided at an appropriate location and used as a ventilation channel.

  As a result, it is not necessary to install a ventilation duct that passes through the loading space separately from the web frame 10, so that the effective volume that can be secured in the loading space is increased, and the number of loaded vehicles is increased and the loading of the hull 1 is increased. Efficiency can be improved.

Moreover, since the web frame 10 mentioned above is tall, the hull side wall 2 also becomes long in the up-down direction. For this reason, if the upper end part (deck) side and lower end part (ship bottom) side of the web frame 10 are compared, a big difference will be produced in the stress of racking.
Therefore, in the second embodiment shown in FIG. 2, as in the web frame 10 </ b> A, a two-stage box cross-sectional shape in which the width dimension Wf ′ on the lower end side where large stress acts is larger than the width dimension Wf on the upper end side. Is adopted. In this case, the web frame 10 </ b> A has a hollow box cross-sectional shape in which two rectangular cross sections are arranged in the longitudinal direction of the hull 1, as in the first embodiment described above.

As a result, the web frame 10A can increase the section modulus on the lower end side from the severely upper end side, so that the lateral protrusion toward the loading space can be minimized and the stress on the racking can be sufficiently increased. The strength of the hull side wall 2 can be improved. The web frame 10A in FIG. 2 has a two-stage box cross-sectional shape, but may have three or more stages as required.
With such a configuration, the lower strength of the hull side wall 2 can be sufficiently secured. For example, against a watertight partition (not shown) disposed above the ballast tank at the bottom of the hull and dividing the vertical direction of the hull 1. In addition, a cargo handling passage having a relatively large opening area can be formed.

  In the embodiment described above, the cross-sectional shape of the web frames 10 and 10 </ b> A is a hollow box cross-sectional shape in which two rectangular cross-sections are arranged in the vertical direction of the hull 1, but is not limited thereto. As other cross-sectional shapes, for example, a web frame 10B having one rectangular cross-sectional shape as in the modification shown in FIG.

As described above, according to the hull structure of the car carrier of the present invention, since the web frames 10 and 10A have the box cross-sectional structure, the amount of protrusion in the center direction in the lateral direction of the hull 1 is suppressed, and Sufficient strength against racking can be obtained. For this reason, since a large opening area can be formed in the installation part (cross section) of the web frame provided so as to divide the loading space in the ship in the vertical direction, the movement of the vehicle in the ship using this opening area as a cargo handling passageway can be performed. This makes it easier to improve the efficiency of cargo handling work.
In addition, if the internal space of the box cross-section structure is used effectively as a ventilation channel, the cargo space on the ship will increase by the installation space of the ventilation channel, and the number of vehicles that can be loaded will increase. Efficiency is also improved.

Although the present invention has been described as being applied to an automobile carrier, there is no fixed wall effective for racking deformation that divides the vertical direction of the hull of the loading space in addition to a tall hull structure, similar to an automobile carrier. In the case of a hull structure, a similar web frame can be applied to a transport ship that transports loads other than automobiles.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

It is a schematic block diagram which shows 1st Embodiment which concerns on the hull structure of the motor vehicle carrier of this invention, (a) is a horizontal sectional view, (b) is AA sectional drawing of (a). It is a longitudinal cross-sectional view of the principal part which shows 2nd Embodiment which concerns on the hull structure of the motor vehicle carrier of this invention. It is a horizontal sectional view of the important section showing the modification concerning the section shape of a web frame. It is an external appearance perspective view which shows the outline | summary of a motor vehicle carrier. It is a schematic block diagram which shows the prior art example which concerns on the hull structure of a motor vehicle carrier ship, (a) is a horizontal sectional view, (b) is BB sectional drawing of (a). It is a longitudinal cross-sectional view which shows the principal part of a prior art example.

Explanation of symbols

1 Car carrier (hull)
2 Hull side wall 10, 10A, 10B Web frame

Claims (2)

In the hull structure of an automobile carrier ship having a web frame arranged in the transverse direction of the hull,
A hull structure of a car carrier, wherein the web frame has a box cross-sectional structure.   2. The hull structure of a car carrier according to claim 1, wherein an internal space of the box cross-sectional structure is used as a ventilation channel.

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