JPH1088544A - Floating breakwater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress waves having long wavelengths by arranging an auxiliary floating body with a space from a breakwater body, and connecting the auxiliary floating body to the breakwater body in such a manner as to be capable of rising and falling. SOLUTION: An auxiliary floating body 3 is arranged with a space from a breakwater body 1 moored by a chain 2. The breakwater body 1 is formed of bottomless tanks 1a-1c partitioned by bulkheads 4 along the advancing direction A of waves, and the upper parts of both the side tanks 1a, 1c are allowed to communicate each other through an air duct 5. The auxiliary floating body 3 formed of a rectangular sealed tank is arranged in parallel to the front surface of the breakwater body 1 by inserting both end parts into a pair of substantially U-shaped guide frames 7 in plane view fixed to both ends of the front surface of the breakwater body 1 through connecting beams 6 in such a manner as to be capable of rising and falling. A plurality of guide rollers 8 make contact with the inner surfaces of the guide frames 7 to smoothly raise and lower the auxiliary floating body 3. Thus, the apparent breakwater width is increased, and waves having long wavelength can be effectively suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating breakwater moored at a predetermined position on the water surface to dissipate wave energy.

[0002]

2. Description of the Related Art It is necessary to eliminate waves in, for example, a fishing boat harbor or a sea area where aquaculture facilities are installed. Therefore, concrete breakwaters are constructed or concrete blocks such as tetrapots are piled up to break the waves, but this requires a long construction period, making it difficult to construct in deep water. Construction costs are extremely high, seawater exchange is hindered, and sand drifting is likely to occur.

Conventionally, there is a floating breakwater to solve the above-mentioned difficulties. This is because a plurality of bottomless tanks are formed along the traveling direction of the wave inside, and the upper portions of the bottomless tanks on both sides have a breakwater main body that is communicated with each other via an air duct. When the water surfaces in the bottomless tank move antisymmetrically with each other, the energy of the waves is dissipated and the waves are extinguished.

[0004]

In the above-mentioned floating breakwater, as the wavelength of the wave becomes longer, the wave-breaking effect becomes smaller, and in order to eliminate the wave having the longer wavelength, the width of the embankment may be increased. This will increase the size of the floating breakwater and increase construction costs.

[0005] In view of the above problems, an object of the present invention is to provide a floating breakwater capable of effectively extinguishing long-wavelength waves without increasing the size.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, an auxiliary floating body is arranged at an interval from a breakwater main body, and the auxiliary floating body moves up and down on the breakwater main body. It is characterized by being connected as much as possible.

[0007] According to the above configuration, since the auxiliary floating body is disposed at a distance from the breakwater main body, the apparent width of the levee body is increased, and the long wavelength wave can be effectively eliminated. The waves can be effectively eliminated even by mutual interference of waves between the breakwater main body and the auxiliary floating body.

According to a second aspect of the present invention, in the first aspect, the swing lever is pivotally supported by the breakwater main body so as to be swingable, and an end of the swing lever is connected to the auxiliary floating body. Further, a damper device is provided between the breakwater main body and the swing lever.

According to the above structure, the auxiliary floating body is raised and lowered by the vertical movement of the wave, and the lifting and lowering is delayed by the damper device, so that the phase of the vertical movement of the auxiliary floating body is shifted from the vertical movement of the wave. To dissipate and dissipate the energy of the wave.

[0010] The third aspect of the present invention is the first or second aspect.
In the described invention, a wave stirring member is provided on a side surface of the auxiliary floating body. According to the above configuration, the waves are disturbed by the wave stirring member to generate vortices, so that the energy of the waves can be more reliably dissipated.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a floating breakwater according to an embodiment of the present invention. A breakwater main body 1 is moored by a chain 2 and is spaced apart from the breakwater main body 1 by an interval α. The auxiliary floating body 3 is arranged.

The breakwater main body 1 has three bottomless tanks 1a to 1b separated by a partition wall 4 along a traveling direction A of waves.
1c, the upper portions of the tanks 1a, 1c on both sides are communicated with each other via an air duct 5.

The auxiliary floating body 3 is formed of a rectangular closed tank, and a pair of substantially U-shaped guide frames 7 in a plan view are fixed at both ends thereof to the front ends of the breakwater main body 1 via connecting rods 6.
It is arranged in parallel with the front surface of the breakwater main body 1 by being inserted into the inside so as to be able to move up and down.

A plurality of guide rollers 8 rotatably provided at both ends of the auxiliary floating body 3 are in contact with the inner surface of the guide frame 7, so that the auxiliary floating body 3 can be raised and lowered smoothly.

A pair of swinging levers 11 along the traveling direction A of the wave are pivotally supported by bearings 9 provided at both ends of the upper surface of the breakwater main body 1 via pivot shafts 10. Is connected to the auxiliary floating body 3 via the connection link 12.

The oscillating lever 11 is used to move the auxiliary floating
It is set to be horizontal by the buoyancy of. A pair of front and rear hydraulic cylinder-type damper devices 13 are provided on the upper surface of the breakwater main body 1 with the pivot shaft 10 interposed therebetween.

In the above arrangement, when a wave is incident in the direction of arrow A, a part of the incident wave is reflected by the auxiliary floating body 3 and is reflected and becomes the remaining transmitted wave. Is raised and lowered, and the swing lever 11
Is swung about the pivot shaft 10, and the swing is damped by the damper device 13.

According to the above construction, the auxiliary floating body 3 is raised and lowered by the vertical movement of the wave, and the vertical movement of the auxiliary floating body 3 and the vertical movement of the wave are shifted by delaying the vertical movement by the damper device 13. The waves can be disturbed by the floating body 3 to dissipate the energy of the waves.

Also, the waves can be effectively eliminated by the mutual interference of the waves between the auxiliary floating body 3 and the breakwater main body 1. Further, the transmitted wave passing under the auxiliary floating body 3 causes the water surface in each of the bottomless tanks 1a to 1c of the breakwater body 1 to move up and down.
An antisymmetric divergent wave is generated, and the vertical movement of the two divergent waves causes the air in the tanks 1a and 1c on both sides to alternately reciprocate through the air duct 5, and the air resistance at that time causes the wave to move. Energy is dissipated.

According to the above configuration, since the auxiliary floating body 3 is arranged at an interval α from the breakwater main body 1, the apparent width of the levee body H is increased and the long wavelength wave is effectively eliminated. be able to.

Further, by connecting a power generation motor to the damper device 13, a wave power generation device can be formed. As shown in FIG. 4, it is preferable that a plurality of wave stirring members 15 having a substantially triangular cross section are provided in parallel on the side surface of the auxiliary floating body 3 at predetermined intervals in the vertical direction.

According to the above configuration, the waves are disturbed by the wave stirring member 15 to generate vortices, so that the energy of the waves can be more reliably dissipated. By forming the edge 15a of each wave stirring member 15 at an acute angle, the wave disturbance effect can be enhanced.

In the above embodiment, the auxiliary floating body 3 is arranged on the front side of the breakwater main body 1, but the auxiliary floating body 3 may be arranged on the rear side of the breakwater main body 1.

[0024]

According to the first aspect of the present invention, since the auxiliary floating body is disposed at a distance from the breakwater main body, the apparent width of the embankment body becomes large, and a long wavelength wave can be effectively removed. And the waves can be effectively eliminated by the mutual interference of the waves between the breakwater main body and the auxiliary floating body.

According to the second aspect of the present invention, the vertical movement of the wave raises and lowers the auxiliary floating body, and the lifting and lowering is delayed by the damper device, so that the phase of the vertical movement of the auxiliary floating body is shifted from the vertical movement of the wave. The waves can be disturbed by the auxiliary floating body, and the energy of the waves can be dissipated.

According to the third aspect of the present invention, the energy of the wave can be more reliably dissipated by generating the vortex by disturbing the wave by the wave stirring member.

[Brief description of the drawings]

FIG. 1 is a side view of a floating breakwater according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a perspective view of a main part showing the modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breakwater main body 3 Auxiliary floating body 11 Swing lever 13 Damper device 15 Wave stirring member α space

Claims (3)

[Claims] 1. A floating breakwater, wherein an auxiliary floating body is arranged at a distance from the main body of the breakwater, and the auxiliary floating body is connected to the main body of the breakwater so as to be able to move up and down. A swing lever pivotally supported by the breakwater main body so as to be swingable, an end of the swing lever being connected to an auxiliary floating body, and being provided between the breakwater main body and the swing lever. The floating breakwater according to claim 1, further comprising a damper device. 3. The floating breakwater according to claim 1, wherein a wave stirring member is provided on a side surface of the auxiliary floating body.