JPS59646B2 - floating wave bank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating wavebank, and an object of the present invention is to provide a floating wavebank that has a simple configuration and can obtain an appropriate wave-dissipating effect.

Conventionally, fixed breakwaters such as rubble stone breakwaters and vertical breakwaters have been well known as breakwaters for the purpose of breaking or dissipating waves in the ocean.

These breakwaters are generally constructed with a strong foundation on the seabed, and although they can be expected to have a certain degree of breakwater effect, the construction work on the seabed and at sea is fraught with various difficulties.
Moreover, it is well known that construction requires a large amount of money and many days.

Furthermore, such fixed breakwaters also have the problem of blocking the exchange of seawater between the open ocean and the inland sea, which are separated by the breakwater, thereby promoting seawater pollution in the inland sea.

Particularly in recent years, efforts have been made to expand the use of the ocean for marine resource development (e.g., artificial fishing grounds) and marine leisure in ports and other areas of the ocean. Alternatively, proposals for wave-dissipating levees are desired.

The present invention was devised in view of the above-mentioned current situation, and an object of the present invention is to provide a floating breakwater that can be easily floated at a suitable location in the ocean and can obtain an appropriate wave-dissipating effect.

Therefore, the present invention consists of a wave-dissipating main body, a floating body and a mooring device for floating the main body, and the lower part of the main body has an opening on the outside and an inclined bottom surface that narrows toward the inside of the main body. In addition to providing a passageway for the entry and exit of seawater,
The upper part of the body is provided with a cavity for storing seawater that communicates through an opening for seawater circulation at the innermost side of the passage, and the body is arranged so that the upper edge of the opening for the passage of seawater is located near the still water surface. Its basic feature is that it is floating on the sea using a mooring device.

Next, one embodiment of the floating wavebank according to the present invention will be described in detail based on the drawings.

The present invention consists of a wave-dissipating main body, a floating body for floating the main body, and a mooring device, and the basic structure of the main body 1 is shown in FIG. 1.

According to this configuration, the vertical plate 2 located at the center of the main body 1
Shelf boards 3, 3 and guide boards 4. are placed symmetrically on both sides of the board.
4, a passage 5 for seawater in and out is provided at the bottom of the main body.
, 5. A cavity 6.6 for storing seawater and an opening 7.7 connecting these cavities 6, 6 are formed in the upper part of the main body 1.

That is, to specifically explain only one side of the vertical board 2, the shelf board 3 has an abbreviated cross-sectional shape by a horizontal board part 31 and a rising board part 32 connected to the side end of the horizontal board part 31. The vertical plate 2 and the shelf plate 3 form a cavity 6 in the upper part of the main body 1 for storing seawater.

On the other hand, the guide plate 4 is located below the shelf board 3 at the bottom of the vertical plate 2 and is connected to the main body 1 in an upwardly inclined state, and the guide plate 4 and the horizontal board of the shelf board 3 An opening 51 is formed in the lower part of the main body 1 on the outside thereof with a portion 31, and the main body 1
A seawater inlet/outlet passageway 5 is formed that narrows upward as it goes inward.

Further, a horizontal plate portion 31 of the shelf board 3 that partitions the empty space 6 from the passage 5.
An opening 7 for seawater circulation is formed in which the cavity 6 and the passage 5 are connected at their innermost portions.

Therefore, the main body 1 configured symmetrically as described above
is given buoyancy by a floating body (not shown), and is floated on the sea by a mooring device 8, as shown in FIG. has been done.

In the above configuration, it is preferable that the rising plate portion 32 of the shelf board 3 has a height corresponding to the incident wave height, and the width B of the main body 1, the draft d, and the height d of the narrowest part of the passage 5. ', the distance t from the vertical plate 2 to the rising plate part 32, the width t' of the opening 7, etc., should be appropriately selected depending on the sea conditions of the area where the floating wave levee is to be installed. , for example t'/l:
Good wave-dissipating efficiency can be obtained by setting the range of 0.1 to 0.3°d'/a:o to about 3 to 0.4.

FIG. 3 shows a more specific embodiment based on the above-mentioned basic configuration, in which the floating wavebank includes a main body 1, floating bodies 10 and 10 provided at both ends of the main body 1 so as to sandwich the main body 1, and the above-mentioned floating breakwater. It is composed of a mooring device 8 for mooring the main body 1 and the floating body 10 that are integrated.

The main body 1 is provided with a vertical plate 2 extending over the entire length of the main body 1 at the center position in the width direction, and on each side of the vertical plate 2, a support frame 11 with an appropriate interval is interposed to form an abbreviated cross-sectional shape. A shelf board 3 is attached, and the vertical board 2 and the shelf board 3 having an abbreviated cross section form a cavity 6 for storing seawater.

Therefore, the shelf board 3 has a horizontal board portion 31 whose tip is connected to the vertical board 2.
The space between the tip of the horizontal plate part 31 and the vertical plate 2 connects the above-mentioned cavity 6 and the seawater inlet/outlet passage 5 described below at the innermost side thereof. It constitutes an opening 7.

Further, at the bottom of each of the shelf boards 3, a guide plate 4 inclined upwardly toward the inside of the main body 1 is attached to the lower part of the vertical plate 2 via one side thereof, and support frames 1 are provided at appropriate intervals.
1 is supported by a vertical board 2 and a shelf board 3.

Thus, the guide plate 4 and the horizontal plate portion 31 of the shelf board 3 form a seawater inlet/outlet passage 5 which has an opening 51 on the outside of the main body 1 and narrows upwardly toward the inner side of the main body 1.

The floating body 10 is attached to both longitudinal ends of the main body 1 constructed as described above.

Further, the mooring device 8 is connected to both sides of each floating body 10, and the mooring device 8 allows the main body 1 and the floating body 10 to be connected to the opening 51 outside the lower part of the main body 1 of the passage 5
The upper edge, that is, the horizontal plate part 31 of the shelf plate 3 having the abbreviated cross section is floating on the sea so that it is located near the sea level in a still water state.

The floating wavebank according to the present invention can be made to have a desired length by arranging the main body 1 and the floating body 10 alternately and continuously.

Next, the operation of the floating wavebank according to the above embodiment will be explained.

First, the ice blocks accompanying the incident wave flow into the cavity 6 through the opening 51, the passage 5, and the opening 7, and also flow out of the main body 1 through the opposite path. As a result, the floating wave dam body moves with a delay in the phase of the incident wave, and this movement consumes the energy of the incident wave and dissipates the wave.

Further, when the ice block moves in and out of the cavity 6, a wave-dissipating effect can be obtained due to the energy loss t.

Incidentally, when the ice blocks flow into and out of the cavity 6, the lower surface of the horizontal plate portion 31 and the guide plate 4 serve as a rectifying plate.

In addition, the horizontal force due to the incident wave acts on the floating wavebank main body with a time lag in the rising plate part 32, guide plate 4, and vertical plate 2, and as mentioned above, energy loss occurs when moving in and out of the hollow part 6. As a result, the wave force acting on the body is reduced, and therefore the mooring force on the body is reduced.

FIG. 4 shows the transmittance of incident waves of the floating wave dyke according to the present invention in comparison with that of the conventional floating wave dyke.

As is clear from this figure, according to the present invention, the transmittance of incident waves can be greatly improved compared to the conventional one, and good wave extinction efficiency can be obtained even for relatively long-period waves. be able to.

The floating wavebank of the present invention as described above is composed of a main body 1 for wave dissipation, a floating body 10 for floating the main body 1, and a mooring device 8. A seawater inlet/outlet passage 5 is provided with an opening 51 and an inclined bottom surface that narrows toward the inside of the main body 1, and communicates with the upper part of the main body 1 through an opening 7 for seawater circulation at the innermost side of the passage 5. A cavity 6 for storing seawater is provided, and the main body 1 is floated on the sea by the floating body 10 and the mooring device 8 so that the upper edge of the seawater entrance/exit opening 51 is located near the still water surface 9. It can be easily floated at a desired location on the sea, has effective wave-dissipating efficiency even for relatively long-period waves, and has a simple structure and can be manufactured at an extremely low cost. It has the great advantage of being able to greatly contribute to the contemporary demands of expanding the use of the ocean.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the floating wavebank according to the present invention, in which FIG. 1 is an explanatory diagram schematically showing a cross section of the main body, and FIG. 2 is similar to FIG. 1. FIG. 3 is a perspective view showing a more specific embodiment. FIG. 4 shows the transmittance of incident waves of the floating wavebank according to the present invention in comparison with that of the conventional one. In the figure, 1 is a main body, 5 is a passage, 6 is a cavity, 7 is an opening, 8 is a mooring device, 10 is a floating body, and 51 is an opening.

Claims (1)

[Claims] 1 Consists of a main body for wave dissipation, a floating body for floating the main body, and a mooring device, and the lower part of the main body has a seawater inlet/outlet opening that opens on the outside and narrows toward the inside of the main body with an inclined bottom surface. In addition to providing a passage, the upper part of the main body is provided with a cavity for storing seawater that communicates through an opening for seawater circulation at the innermost side of the passage, and the main body is arranged such that the upper edge of the opening for seawater inflow and outflow is near the still water surface. A floating wave levee, characterized in that it is floated on the sea by the floating body and a mooring device so that the floating body and mooring device can be positioned.