JPH06108431A - Floating wave dissipation levee - Google Patents

Abstract

PURPOSE:To make it possible to moor a floating wave dissipation levee so that it is not in the way of navigation of a ship and, at the same time, to enable the dissipation of short and long wavelength waves effectively and to make a large-sized wave dissipation levee body unnecessary without generating excessive mooring force even in the narrow surface of water. CONSTITUTION:Three bottomless tanks 1b, 1c and 1d are formed inside a wave dissipation levee body 1 along the forward direction A of waves and, at the same time, the wave dissipation levee body 1 is moored to a dolphin 2 through buffer members 2c so that it is capable of rising and falling in the floating wave dissipation levee formed by connecting the upper parts of both side bottomless tanks 1b and 1d to each other through air ducts 4. Wave dissipation boards 3 and 3 having a large number of slits 7 are vertically provided to both sides of the wave dissipation levee body 1.

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 the energy of waves.

[0002]

2. Description of the Related Art Conventionally, in this type of floating breakwater, three bottomless tanks are formed inside along the traveling direction of the waves, and the upper portions of both portless bottomless tanks communicate with each other through air ducts. The main body of the breakwater is moored at a predetermined position on the water surface by a chain, and the water surfaces in the tanks without the bottoms of the ports move antisymmetrically to each other, so that the energy of the wave is It is designed to dissipate and then dissipate.

[0003]

In the above conventional floating breakwater, the main body of the breakwater is moored by the chain. According to this, the chain can be easily moored even when the water depth is deep, but the chain can be used for navigation of ships. However, it has the disadvantage that it cannot be moored on a narrow water surface.

Further, short-wave waves can be effectively eliminated by the wave-eliminating action of the above-mentioned portless bottom tanks, but long-wave waves are eliminated because the main body of the wave breaker rides on the waves. There is a difficulty that it is difficult. Therefore, it is conceivable to deepen the draft of the main body of the breakwater. According to this, it is possible to cancel long-wave waves, but since the chain is subjected to excessive mooring tension, the chain will be strong. It is necessary to use, and the breakwater main body becomes large, and the construction cost becomes high. In addition, there is a drawback that it becomes difficult to eliminate a short wavelength wave.

In view of the above problems, the present invention is capable of mooring so as not to hinder the ship even on a narrow water surface, and can effectively eliminate short-wave and long-wave waves.
Moreover, it is an object of the present invention to provide a floating breakwater that does not generate an excessive mooring force and does not need to upsize the breakwater main body.

[0006]

In order to achieve the above object, the present invention forms three bottomless tanks inside the main body of a breakwater along the traveling direction of a wave, and at the same time, at the upper part of the bottomless tanks on both sides. In a floating breakwater in which the above are communicated with each other via an air duct, the breakwater main body has a predetermined water surface by fitting recesses formed at both ends of the breakwater body into a dolphin via a cushioning member so that the breakwater can move up and down. It is characterized in that a wave-breaking plate having a large number of slits penetrating is hung vertically on both sides or one of both sides of the body of the breakwater.

[0007]

According to the above construction, when a wave is incident, a part of the incident wave hits the side plate of the breakwater main body and becomes a reflected wave, and the remaining wave passes through the slit of the breakwater plate. , Of the transmitted waves, the long wavelength wave is
The energy is dissipated mainly by being disturbed by the slits, and the short-wave wave moves up and down the water surface in each tank of the breakwater main body, which causes the air duct damping to dissipate the energy in the tanks without port and bottom. However, it becomes an antisymmetric divergent wave, and in the tank without a central bottom, it becomes a divergent wave symmetrical with the transmitted wave, and these diverged waves interfere with each other and are disturbed to dissipate the energy. Can be reduced.

[0008]

1 shows an embodiment of the present invention, in which a breakwater main body 1 is moored by dolphins 2, and a breakwater plate 3 is provided on both sides of the breakwater main body 1. 3 is installed vertically.

As shown in FIGS. 2 to 4, the breakwater main body 1 is a closed tank-shaped floating body 1 formed at both ends thereof.
a, 1a and three bottomless tanks 1b, 1c, 1d formed in the central portion thereof along the wave traveling direction A, and the upper portions of both of the portless bottomless tanks 1b, 1d are connected via the air duct 4. The central bottomless tank 1c has an open upper surface.

According to the above construction, when a wave enters, the water surface in each of the bottomless tanks 1b, 1c, 1d is moved up and down mainly by the short wavelength wave of the incident wave. In the bottomless tanks 1b and 1d,
An antisymmetric diverging wave is generated, and the vertical movement of both diverging waves causes the air in the tanks 1b and 1d without port bottoms to alternately flow back and forth through the air duct 4, and the air resistance at that time causes the waves to flow. Central bottomless tank 1 with energy dissipated
In c, a divergent wave symmetrical to the incident wave is generated, and the divergent wave of the central bottomless tank 1c and the divergent waves of the both sideless tanks 1b and 1d interfere with each other to be disturbed and to dissipate energy. Thereby, the wave height of the short wavelength wave can be reduced.

Incidentally, the freeboard of the breakwater main body 1 may be made as small as possible so that the waves over it are disturbed to dissipate the energy of the waves. Dolphin 2
Is planted on the seabed, and its upper end is the sea surface W. L
A prismatic concrete pile 2a protruding further upward, and a plurality of steel pipe core materials 2 arranged in the concrete pile 2a
b, and a rubber fender (cushioning member) 2c is fixed to the outer peripheral surface of the b. The breakwater main body 1 can be moored to the dolphin 2 so as to be able to move up and down.

According to this structure, no mooring chain or the like is provided outside the breakwater main body 1, and the ship can freely sail near the breakwater main body 1.
The floating breakwater of the present invention can be moored even in a narrow sea area.

As shown in FIG. 5, the wave-breaking plates 3 and 3 are integrally formed with the port-side outer plate 6 of the breakwater main body 1 so as to be flush with each other. A large number of vertically long slits 7 are provided at predetermined intervals along the longitudinal direction of the breakwater body 1.

According to the above construction, since the draft is deepened by the wave-eliminating plates 3 and 3, when a wave is incident, not only the short wavelength wave but also the long wavelength wave is included in the incident wave. Also penetrates the slits 7 by hitting the wave-eliminating plates 3 and 3, and is disturbed during the transmission to dissipate the energy, and also the long-wavelength transmitted wave and the bottomless tanks 1b and 1b.
The divergent waves generated in c and 1d interfere with each other and are disturbed to dissipate the energy, whereby the wave heights of the short wavelength and long wavelength waves can be reduced. In FIG. 5, reference numeral 8 is a reinforcing rod for reinforcing the wave-eliminating plates 3 and 3.

According to the above construction, the draft is deep, but this is due to the provision of the wave breakers 3 and 3, and the breakwater main body 1 is not enlarged. Therefore, as described at the beginning, the large-scale breakwater body with a deep draft cannot effectively cancel the short-wavelength waves, resulting in excessive mooring force and high construction costs. However, according to the present invention, all of these drawbacks can be eliminated.

Explaining the principle of wave-dissipating, first, when a wave is incident, a part of the incident wave hits the port side outer plate 6 and the wave-dissipating plates 3 and 3 of the wave-dissipating body 1, and becomes a reflected wave. The remaining wave passes through the slits 7 of the wave-eliminating plates 3 and 3 to become a transmitted wave. Of this transmitted wave, the long-wavelength wave is mainly disturbed by the slit 7 to dissipate the energy and the short-wavelength wave. Is the bottomless tanks 1b, 1c, 1d of the breakwater main body 1.
The water surface in the inside is moved up and down, whereby, in the tanks 1b and 1d without port bottoms, the energy inside is dissipated by the air resistance generated by the air flowing back and forth through the air ducts 4 alternately, In the central bottomless tank 1c, it becomes a divergent wave symmetrical with the transmitted wave, and these divergent waves interfere with each other and are disturbed to dissipate energy, and at the same time, the divergent waves are also disturbed by the slits. And the wave heights of short-wavelength and long-wavelength waves can be reliably reduced.

In the above-mentioned embodiment, the wave breaking plates 3 are vertically provided on both sides of the breakwater main body 1, but as shown in FIG. 6, the wave breaking plate 3 may be provided only on the front side of the breakwater. On the contrary, the wave-eliminating plate 3 may be provided only on the rear port side (not shown).

Further, although the vertically long slit 7 is provided through the wave-breaking plates 3 and 3, instead of this, for example, the horizontally long slit 7 may be provided.

[0019]

According to the present invention, the breakwater main body is moored by the dolphin, and no mooring chain or the like is provided outside the breakwater main body. It is possible to moor it so that it does not hinder the navigation of ships even on narrow water surfaces.

The three bottomless tanks formed inside the breakwater main body can effectively cancel the short wavelength wave as in the conventional case, and both or both sides of the breakwater main body. Since a wave-eliminating plate is vertically provided on one side to deepen the draft, it is possible to surely wave-eliminate even a wave having a long wavelength by passing through the slit of the wave-eliminating plate.

Further, although the draft is deep, the breakwater main body is not large, so that an excessive mooring force is not generated. Therefore, it is necessary to particularly increase the strength of the breakwater main body and the dolphin. Because there is no, the construction cost is low. Moreover, since the slits are provided in the wave breaking plate, an excessive load is not applied to the wave breaking plate.

[Brief description of drawings]

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

FIG. 2 is a cutaway front view of the same portion.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is an enlarged cross-sectional view of the breakwater main body.

FIG. 6 is an enlarged cross-sectional view showing the same modified example.

[Explanation of symbols]

 1 Wave breakwater main body 1b, 1d Tank without port bottom 1c Tank without center bottom 2 Dolphin 2c Rubber fender (buffer member) 3 Wave breaker plate 4 Air duct 7 Slit A Wave traveling direction

Claims (1)

[Claims] 1. A floating breakwater in which three bottomless tanks are formed inside the main body of the breakwater along the traveling direction of the wave, and the upper portions of both the bottomless tanks are connected to each other through an air duct. In the above, the breakwater main body is moored to a predetermined water surface by fitting recesses formed at both ends thereof to a dolphin via a cushioning member so as to be lifted, and both or both sides of the breakwater main body. On the other hand, a floating breakwater is characterized in that a breakwater plate with many slits is hung vertically.