JPS6224567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating breakwater applied to temporary breakwaters in aquaculture fishing grounds, fishing ports, construction sites, etc.

Conventionally, as this type of floating wave bank, JP-A-55-3349
In the publication, a large number of buoyancy generating bodies made of foamed polystyrene solid bodies of spherical or other arbitrary shapes or spherical hollow plastic bodies are placed in an outer envelope through which water can flow, with appropriate spaces formed between them. A wave-dissipating float that is housed in

The conventional wave-dissipating float dissipates wave energy by causing turbulence in the flow of waves passing through the outer envelope using the buoyant force generating body housed within the outer envelope. Since the generating body is composed of a solid body of expanded polystyrene or a spherical plastic hollow body, the natural period cannot be adjusted, and it is not necessarily expected that the wave-dissipating effect will be responsive to the conditions of the water area where the floating wave levee is installed. Can not do it.

The present invention has been proposed to solve these problems, and includes a plurality of flexible tubes that can adjust the amount of water and air inside the box frame with window holes on the outer circumferential surface. The purpose of the floating wave dyke is to create an improved floating wave dyke with good wave-dissipating efficiency that can be expected to have a wave-dissipating effect in any water area. It is in the point of providing.

The floating wavebank according to the present invention can be used in a required water area,
The air bladder is made to float approximately perpendicular to the direction of wave propagation, and the box frame is moored to the underwater base via anchor cables.

As mentioned above, in the floating wavebank according to the present invention, since the window hole is bored in the outer peripheral surface of the box frame,
A portion of the wave hits the outer peripheral surface of the box frame and is reflected, and a portion of the wave generates a vortex when it passes through the window hole and enters the box frame, and energy is dissipated.

At this time, since a flexible air envelope is installed inside the box frame, the waves that enter the box frame are reflected and at the same time there is a phase difference between them and the waves on the outside of the box frame. This phase difference causes a wave-dissipating effect.

In addition, the plurality of flexible air bladders installed inside the box frame move as waves enter the box frame, disturb the free water inside the box frame, and also disturb the free water inside the box frame. A phase-difference wave cancellation effect is performed. At this time, by appropriately adjusting the amount of water and air in each of the air sacs, making the natural period of each air sac different, and causing a shift in the motion response of the air sac due to waves, phase difference wave cancellation becomes more effective. can be carried out in a specific manner.

In addition, as mentioned above, phase difference wave dissipation can be performed by the movement of the entire floating wavebank floating on the water surface, and in this case, as mentioned above, the amount of water and air in each of the air bladders is By adjusting this, it is possible to make the floating wavebank have a natural period that is optimal for phase difference wave cancellation.

In this way, the floating wavebank according to the present invention not only has an excellent wave-dissipating effect in any water area by adjusting the natural period of each of the air bladders, but also can be prefabricated and can be used on water. The present invention has many advantages, such as being able to be connected and attached by itself, does not require a special manufacturing yard, has low manufacturing costs, and when repairing, the function can be restored to its original state simply by replacing the damaged part. It has the following advantages.

The present invention will be described below with reference to the illustrated embodiments.

1 is a rectangular box frame, and a large number of window holes 2 are bored in the outer peripheral surface of the box frame 1.

Between opposing frame pieces of the box frame 1, a plurality of flexible air bladders 3, such as rubber tubes whose internal water and air volumes can be adjusted, are attached to form a floating wave bank.

Depending on the wavelength and wave height, the air envelope bodies 3 are arranged in a single layer as shown in FIG. 2, or in multiple layers as shown in FIG. 3. As shown in FIGS. 4 and 5, by adjusting the amount of water inside the air bladder, it is arranged in a partially curved shape.

In the floating wavebank constructed as described above, each air bladder 3 is arranged on the water surface so as to be substantially perpendicular to the direction of wave travel, and is moored to an anchor on the underwater base via an anchor rope 4. be.

Therefore, a part of the wave is reflected by the outer peripheral surface of the box frame 1, and a part of the wave causes turbulence when it passes through the window hole 2 and enters the box frame 1, and energy is dissipated. The wave-dissipating effect is carried out.

Further, a phase difference is generated between the waves entering the box frame 1 due to the air envelope 3 disposed within the box frame 1 and the waves on the outer surface of the box frame 1, and a wave-dissipating action is performed. On the other hand, as the waves enter the box frame 1, the air sac 3 moves and disturbs the free water inside the box frame 1.
Waves entering the box frame 1 are subjected to phase difference cancellation.

At this time, by appropriately adjusting the amount of water and air in each of the air sacs 3 and shifting the natural period of each of the sacs 3, a shift is caused in the motion response of each sac 3 to the waves. In this way, phase difference cancellation can be carried out more effectively.

In addition, phase difference wave dissipation can be achieved by the movement of the entire wave-dissipating levee floating on the water surface, and in this case as well, by adjusting the amount of water and air in the air bladder 3, the position of the floating levee can be adjusted. It is possible to provide an optimal natural period for phase difference cancellation.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to the above-described embodiments, and can be modified in various ways without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway slope view of one embodiment of a floating wavebank according to the present invention, FIG. 2 is a longitudinal cross-sectional view thereof, and FIGS. 3 and 4 are views of other embodiments, respectively. An example longitudinal sectional view, FIG. 5 is a partial longitudinal sectional side view of FIG. 4. 1... Box frame, 2... Window hole, 3... Air sac body.

Claims (1)

[Claims] 1. A floating wave levee, characterized in that a plurality of flexible air bladders capable of adjusting the amount of internal water and air are attached to a box frame with a window hole bored in the outer peripheral surface.