JPH11100833A - Oil fence - Google Patents

Abstract

(57) [Summary] [Problem] When an oil spill accident occurs at sea, as an oil fence extended for the purpose of preventing oil diffusion and the like, conventionally, a skirt portion is hung on the lower surface side of the float portion. Although a structure in which a weight is attached to the lower end of the skirt portion is used, the skirt portion is easily pushed up by waves or tides, and oil caught in the sea passes through the skirt portion to the outside of the oil fence. There was a problem that it easily escaped. SUMMARY OF THE INVENTION An object of the present invention is to provide an oil fence having an effect that a skirt portion is hardly pushed up by a wave or a tide, and furthermore, there is little resistance to the skirt portion when pulling up the oil fence and workability is excellent. An oil fence (1) according to the present invention includes a float (2) and a skirt (3) suspended below the float (2).
And a structure in which the rope-shaped weight 4 is hung down from the lower part of the skirt portion 3 along the longitudinal direction of the float portion by a hanging tool 5 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil fence used for preventing oil diffusion when an oil spill accident occurs on the sea.

[0002]

2. Description of the Related Art In recent years, marine accidents of oil transport tankers have occurred frequently, and pollution caused by oil spilled from tankers has become a major social problem. Oil spilled from tankers is spread by the ocean currents, causing widespread pollution and seriously affecting ecosystems.In the event of an oil spill, oil spills can be spread over a wide area using booms. Measures have been taken to prevent oil from entering the area near the coast.

[0003] Conventionally, as an oil fence, one mainly comprising a float portion and a skirt portion hanging down from the float portion has been generally used. When this oil fence is extended on the sea, the float part floats on the sea surface and the diffusion of oil on the sea surface is prevented by the float part protruding on the sea surface, and the skirt part hangs down from the float part into the seawater, The skirt portion prevents the oil caught in the sea by waves or the like from escaping to the outside of the oil fence.

[0004]

In the above-mentioned conventional oil fence, a weight is attached to the lower end of the skirt to ensure that the skirt is hung down into the sea. It is difficult to prevent the skirt from being pushed up by the waves and tides just by attaching the weight, and it is easy for oil caught in the sea to pass through the skirt and escape to the outside of the fence There was a problem. In addition, since the skirt portion is made of canvas or the like, there is a problem in that when the oil fence is pulled, large water resistance is applied to the skirt portion, and it is difficult to pull the oil fence.

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that the above problems can be solved by providing a space from the lower part of the skirt and hanging a rope-shaped weight. It was completed.

[0006]

That is, in the oil fence of the present invention, a space is provided from a lower portion of the skirt portion along a longitudinal direction of the float portion, a skirt portion suspended below the float portion, and a float portion. And a hanging rope-shaped weight.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of an oil fence 1 according to the present invention. In the drawings, reference numeral 2 denotes a float portion, 3 denotes a skirt portion made of canvas or the like, and a skirt portion 3 A rope-shaped weight 4 is hung down from the lower part of the skirt 3 along the longitudinal direction. When the oil fence 1 is extended on the sea surface 10, the float 2
Is floated on the sea surface 10, and the skirt portion 3 is configured to hang down from the lower surface of the float portion 2 into the sea.

The float portion 2 may have a structure in which a core material 2a made of a synthetic resin foam or the like is covered with a coating material 2b made of a canvas or the like.
b may be made of a water-tight and air-tight material, and may have an air tube-like structure in which air is sealed inside the covering material 2b instead of the core material 2a. As the synthetic resin foam constituting the core material 2a, a synthetic resin foam conventionally used for an oil fence, such as a polystyrene foam or a polyolefin foam, can be used. It is preferable that the float part 2 is formed by connecting a plurality of parts formed in a length in consideration of the storability of the oil fence 1 and good surfing.

As a method of providing a space from the lower portion of the skirt portion 3 and suspending the rope-shaped weight 4, for example, as shown in FIG. There is a hanging method. As the rope-shaped weight 4, a lead rope or the like can be used. The means for hanging the rope-shaped weight 4 is not limited to the case where a plurality of string-shaped hanging members 5 as described above are used, but the skirt portion 3
Any space may be formed as long as a space through which seawater can pass is formed between the lower part of the car and the rope-shaped weight 4. For example, as shown in FIG. It can also be configured to do so.

In the oil fence 1 of the present invention, a rope-shaped weight 6 can be attached to a lower portion of the float portion 2 in order to enhance the stability of the float portion 2. A rope-shaped weight 7 can also be attached to the lower end of the skirt 3, but the weight of the weight 7 must be lighter than the weight of the weight 4.

FIG. 4 shows another example of the oil fence of the present invention. In the example shown in FIG.
Are formed so that the cross-sectional shape orthogonal to the longitudinal direction becomes an egg shape, and the upper part of the float base 7 serves as the wave avoiding part 8. In conventional oil fences, the float part is generally formed in a cylindrical shape from the viewpoint of stability, but there is a drawback that the oil reaches the outside of the oil fence beyond the cylindrical float part when the wind is strong . If the diameter of the float is increased to solve such a problem, there is a problem that the buoyancy received by the float is increased and the stability is reduced. However, when the float portion 2 is configured such that the cross-sectional shape orthogonal to the longitudinal direction of the float portion 2 is vertically elongated, such as an oval shape, the buoyancy received by the float portion 2 does not increase.
The projecting height of the float portion 2 from the sea surface 10 can be increased, and the oil on the sea surface 10 is removed by the action of the wave avoiding portion 8.
And it can be effectively prevented from reaching the outside of the fence 1.

In the example shown in FIG. 4, the float portion 2 is formed such that its cross section orthogonal to the longitudinal direction of the float portion 2 has an oval shape, and the upper portion of the float portion 2 functions as the wave avoiding portion 8. Although the float portion 2 has a cross-sectional shape that is elongated in the vertical direction as a whole, the float portion 2 has any shape as long as the upper portion of the float portion 2 functions as the wave avoiding portion 8. It may be. Float part 2
As another shape (or core material 2a), for example, FIG.
The cross-sectional shapes shown in (A) to (C) are exemplified, but those having a low center of gravity are preferred.

As shown in FIG. 4, when the float 2 is formed to have a vertically elongated cross section, the float 2 can be easily rotated in the direction of the arrow in FIG. It is necessary to provide a rotation inhibiting wing 9 for suppressing the rotation of the part 2. In the case where the cross section of the float portion 2 is configured to have a vertically elongated shape, unless the rotation inhibiting wings 9 are provided, not only the float portion 2 rotates but also the effect of providing the wave avoiding portion 8 is not exhibited. In addition, the rotation of the float 2 may cause the skirt 3 to be rolled up, which may affect the function of the skirt 3.

The rotation preventing blade 9 has a structure in which a core material 9a made of the same synthetic resin foam as the float portion 2 is covered with a coating material 9b made of canvas or the like, or an air tube-shaped structure. Can be. The rotation preventing wing 9 can be connected to the float portion 2 by a connecting tool such as a fastener.

The rotation preventing wing 9 may be provided only on one side of the float portion 2, but is preferably provided on both sides. Further, the rotation preventing wings 9 may be provided continuously along the longitudinal direction of the float portion 2, but if the rotation suppressing wings 9 are provided intermittently,
When the oil fence 1 is pulled to collect the oil surrounded by the oil fence 1, it is difficult for the oil to flow along the surface of the oil fence 1 and, as a result, the oil is effectively prevented from leaking outside from the oil fence 1. Can be prevented.

In the example shown in FIG. 4, the case where the rotation inhibiting wing 9 is formed separately from the float portion 2 is shown.
The rotation preventing wings 9 and the rotation preventing wings 9 can be integrally formed. For example, as shown in FIGS. It is also possible to use a core material in which the constituent core material 9a is integrated, and cover this surface with a covering material such as a canvas. In addition, if the rotation suppressing wing 9 is overhanged in the horizontal direction, the wave resistance is undesirably increased. Therefore, considering the height and overall shape of the float portion 2 and the weight of the weight directly below the float portion 2, the rotation suppressing wing 9 extends horizontally in a range where rotation (falling) of the float portion 2 can be prevented. Is desirably minimized.

As shown in FIG. 1, a plurality of the oil fences 1 of the present invention can be used by connecting a plurality of them by a connecting tool 11 such as a fastener. Further, the oil fence 1 of the present invention can be configured such that the oil absorption mat can be attached to the float portion 2 by a fixture such as a fastener.

[0019]

As described above, the oil fence of the present invention is obtained by suspending the rope-shaped weight along the longitudinal direction of the float from the lower part of the skirt suspended from the float. The skirt was suspended in a stable state, and the skirt was not easily pushed up by waves or tidal currents like a conventional oil fence with a weight directly attached to the lower end of the skirt. Oil can be effectively prevented from passing through the skirt and escaping to the outside of the fence. Also, compared to the conventional oil fence in which a weight is directly attached to the lower end of the skirt, the resistance of the water received by the skirt when pulling the fence etc. can be reduced, and the workability of pulling the fence is improved. And the like.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an essential part showing an example of a state in which an oil fence of the present invention is extended on the sea.

FIG. 2 is a partially cutaway perspective view of the oil fence of the present invention.

FIG. 3 is a partially cutaway perspective view showing a different aspect of the oil fence of the present invention.

FIG. 4 is a partially cutaway perspective view showing still another embodiment of the oil fence of the present invention.

FIG. 5 is a schematic longitudinal sectional view of the float portion showing a different aspect of the float portion.

FIG. 6 is a schematic longitudinal sectional view of a structure in which a core material forming a float portion and a core material forming a rotation suppressing wing are integrally formed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil fence 2 Float part 3 Skirt part 4 Rope weight 5 Hanging tool

Claims (1)

[Claims] 1. A float portion, a skirt portion hanging down from the float portion, and a rope-shaped weight hanging down from the lower portion of the skirt portion along a longitudinal direction of the float portion. An oil fence characterized by: