JP3780615B2 - Double bottom ship's double bottom traffic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double bottom ship traffic device for a double shell ship with a double bottom.
[0002]
[Prior art]
If a tanker that transports cargo is stranded on the ship or collides with another ship, the ship's hull is damaged. The double-shell regulation that makes the hull a double-shell structure is performed.
[0003]
Against this background, the majority of merchant ships are double-shelled ships with double bottoms regardless of their type.
[0004]
In the double-shell ship having the above-mentioned double bottom, as shown schematically in FIG. 3 (a) and (b), an example of the double bottom 2 comprising a ship bottom inner plate 2a and a ship bottom outer plate 2b is provided on the hull 1. A circular opening 4 and an oblong opening 5 are provided as a traffic device in the double bottom 2 on the girders 3 as a substantial floor that is configured and arranged in the double bottom 2. 6 is a hull strength member, 7 is a through-hole (slot) provided in the girder 3 so that the face material 6a of the hull strength member 6 penetrates, and 8 is a space between the through-hole 7 and the oval opening 5. A color plate as a reinforcing member attached to a through hole 7 portion in order to avoid high stress caused by a short distance s is shown.
[0005]
As the traffic device in the double bottom 2, in the case of the circular opening 4, since the trafficability is poor, the oval opening 5 is generally more advantageous. That is, the oval opening 5 has a vertical dimension a, a horizontal dimension b, and a height h in consideration of trafficability.
[0006]
[Problems to be solved by the invention]
However, in the case of the oval opening 5, the color plate 8 is used as a reinforcing plate as described above because the lower end portion is located close to the through hole 7 provided in the beam member 3. Since grooving must be performed according to the shape of the hull strength member 6, the work is troublesome. If the distance s between the lower end side of the oval opening 5 and the through hole 7 of the girder 3 can be increased, the reinforcement using the color plate 8 can be made unnecessary or the groove processing can be performed. Can be dealt with by installing a doubler plate that is unnecessary and easy to work at a position between the opening 5 and the through-hole 7, but recently, considering the frequency of inspection and maintenance in the double bottom 2, Since further enlargement of the opening 5 is desired, the actual situation is that an effective measure that can solve the above-mentioned problems cannot be found.
[0007]
Therefore, the present invention is intended to improve local reinforcement measures due to proximity to the hull strength member through-hole even if the opening is enlarged to improve the traffic.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a girder arranged in a double bottom with a large opening that is long in the vertical direction and close to the lower hull strength member through-hole in the opening. The lower end side is a non-semicircular shape in which the ellipse is halved in the major axis direction and has a narrow shape, and the distance between the lower end side of the opening and the lower hull strength member through-hole is increased. To do.
[0009]
Since the lower end portion side of the vertical direction of the opening becomes narrower shape, to be able to increase the distance between the lower end of the open hole and the bottom of the hull strength member through-hole, the peripheral portion The stress can be reduced.
[0010]
The surface portion of the spar located between the hull strength member through-hole of the lower end and the lower portion adjacent the hull strength member through hole of the bottom of definitive long large aperture in the vertical direction provided on the spar Further, by adopting a configuration in which a reinforcing plate is attached, a doubler plate that can be easily processed can be used as the reinforcing plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows an embodiment of the present invention. In a double-shell ship having a double bottom 2 similar to that shown in FIGS. The lower end side 9a adjacent to the lower hull strength member through hole 7 in the opening 9 is formed in a non-semicircular shape such that an ellipse with an appropriate angle is halved in the major axis direction. And the distance S between the lower end side 9a of the opening 9 and the lower through-hole 7 is set large.
[0013]
Since the lower end portion 9a of the opening 9 has a shape narrower than the semicircular shape, an oblong opening 5 as shown in FIG. The distance can be larger than the distance s (S> s). Thereby, the stress concentration acting on the peripheral portion on the lower end portion side 9a of the opening 9 can be relaxed, and the reinforcement of the portion can be made unnecessary.
[0014]
Thus, since the large opening 9 can be provided in the girder 3 without hindrance, inspection and maintenance performance in the double bottom 2 can be improved.
[0015]
Next, FIG. 2 shows another embodiment of the present invention. In the same configuration as that shown in FIG. 1, the peripheral portion on the lower end side 9a of the opening 9 is removed from the problem of the hull design strength. The case where it is necessary to reinforce is shown. That is, the doubler plate 10 is attached as a reinforcing plate at a position between the lower end side 9a of the opening 9 and the lower through hole 7 in the surface portion of the girder 3.
[0016]
In the case of the one shown in FIG. 2, as described above, since the distance S between the lower end side 9 a of the opening 9 and the lower through-hole 7 is large, the doubler plate 10 can be easily reinforced. At this time, the doubler plate 10 needs to be processed into a shape that follows the shape of the lower end portion 9a of the opening 9 and the shape of the lower through-hole 7. However, since it is not necessary to perform groove processing, it can be processed easily. As compared with the color plate 8 as shown in FIG. 3B, the work surface can be simplified.
[0017]
In the above embodiment, since the lower end portion of the opening 9 is positioned close to the lower through-hole 7, the shape of the lower end portion 9a is a non-semicircular narrow width. When the size of 9 is further increased, or when the thickness of the double bottom 2 is thin, the upper end portion adjacent to the upper through-hole 7 may have the same shape, and is indicated by a two-dot chain line in FIG. As described above, it is optional to adopt the same configuration for the fitting pipe hole 11, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
[0018]
【The invention's effect】
As described above, according to the double bottom ship traffic device of the double shell ship of the present invention, the following excellent effects are exhibited.
(1) The girder arranged in the double bottom is provided with a large opening that is long in the vertical direction, and the lower end of the opening that is close to the lower hull strength member through-hole is the long axis of the ellipse. a narrow shape as a non-semicircular shape such was halved in the direction, since the distance increases with the structures between the lower end portion side and the bottom of the hull strength member through-hole of the open hole, the lower end portion of the open hole and it is possible to increase the distance between the side and bottom of the hull strength member through-hole, will be able to alleviate the stress concentration due to the distance is smaller. More thereto, it is possible to eliminate the need for reinforcement, to be able to meet the demand for large apertures, inspection of the double bottom, it is possible to improve the maintainability.
(2) the surface of the spar located between the lower end and said lower hull strength member through-hole of the adjacent definitive long large aperture in the vertical direction provided on the spar and the lower portion of the hull strength member through hole By adopting a configuration in which a reinforcing plate is attached to the part, it is possible to easily reinforce the high-stress part. At this time, a doubler plate that can be easily processed can be adopted as the reinforcing plate, which is advantageous in terms of the work surface.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the present invention.
FIG. 2 is a schematic view showing another embodiment of the present invention.
FIGS. 3A and 3B show an example of a double-shell ship, where FIG. 3A is a schematic longitudinal sectional view of a hull, and FIG. 3B is an enlarged view of a double bottom.
[Explanation of symbols]
2 Double bottom 3 Girder 7 Through hole 9 Open hole 9a Lower end side 10 Doubler plate (reinforcement plate)

Claims (2)

The girder arranged in the double bottom is provided with a large opening that is long in the vertical direction, and the lower end of the opening adjacent to the lower hull strength member through-hole is half the ellipse in the major axis direction. a narrow shape as a non-semicircular shape such was, the double bottom of the double shell vessel characterized in that to increase the distance between the lower end of the open hole and the bottom of the hull strength member through hole Transportation equipment. The surface portion of the spar located between the hull strength member through-hole of the lower end and the lower portion proximate definitive long large aperture in the vertical direction provided on the spar and the lower portion of the hull strength member through-hole, The double bottom ship traffic device of a double shell ship according to claim 1, wherein a reinforcing plate is attached.

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