JP2003342937A - Floating wave-absorbing bank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floating wave-absorbing bank capable of improving wave-absorbing efficiency by dissipating not only waves of comparatively short period but also waves of a comparatively long period, constituting a floating body and a mooring member at a low cost in a small scale. <P>SOLUTION: In the wave-absorbing bank 10, the floating body 11 being floated from the surface of the water (a) and breaking waves in the case of small waves is moored and constituted so as to be submerged near the surface of the water (a) in the case of large waves, and a recessed section 11a shallow- water breaking waves c2 at the comparatively long period flowing in under the submerged state in the vicinity of the surface of the water (a) in the case of large waves is formed to the floating body 11. In the wave-absorbing bank 10, the upper section 11b of the recessed section 11a of the floating body 11 is floated from the surface of the water (a) and breaks waves c1 of comparatively short period in the case of small waves. In the bank 10, the whole recessed section 11a of the floating body 11 is submerged near the surface of the water (a) in large waves, and waves c2 of comparatively long period flowing in under the submerged state are broken by the recessed section 11a in shallow water. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating breakwater provided at a predetermined position on the surface of water for extinguishing waves.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a floating breakwater which is provided at a predetermined position on the surface of water along the coast and eliminates generated waves. This floating breakwater is generally configured by a floating body formed so that it can float on the water surface, and moored to the bottom of the water by a mooring member.

[0003]

In the conventional rectangular floating wave breakwater, although the wave cancellation efficiency is generally good for waves of a relatively short period at the time of small waves, comparison with that at the time of large waves is generally made. In order to improve the wave-dissipating efficiency even for long-period waves, it was necessary to increase the width of the floating body and construct it on a large scale. Since the mooring force of the floating body increases as the size of the floating body increases, the mooring member needs to be thick and expensive. That is, in the case of dealing with not only waves having a relatively short period at the time of small waves but also waves having a relatively long period at the time of large waves, there is a drawback that the floating body and the mooring member become large-scale and expensive. there were.

In view of the above circumstances, an object of the present invention is to construct a floating body and a mooring member at a small scale and at a low cost, and at the same time, not only a wave having a relatively short period during a small wave but also a wave having a relatively long period during a large wave. The purpose of the present invention is to provide a floating breakwater capable of extinguishing waves and improving the efficiency of wave breaking.

[0005]

In order to solve the above-mentioned problems, the invention described in claim 1 has, for example, FIGS.
As shown in (b), it is a floating wave breakwater 10 formed by mooring a floating body 11 that floats from the water surface a and breaks into waves during small waves so that it can be submerged near the water surface a during large waves.
In addition, the concave portion 11 that collapses the wave (wave c2 having a relatively long period) flowing in the water in the vicinity of the water surface a at the time of a large wave into shallow water.
The feature is that a is provided.

According to the first aspect of the invention, in the floating breakwater, the floating body floats above the surface of the water and breaks the wave with respect to a wave having a relatively short period during small waves. In this floating breakwater, the floating body is submerged in the vicinity of the surface of the water during a large wave, and in this submerged state, waves of a relatively long period are collapsed in shallow water by the concave portion. Therefore, the floating breakwater can eliminate not only waves having a relatively short period during small waves but also waves having a relatively long period during large waves. Then, in the event of large waves, the floating body is submerged in water, so that the resistance received from a wave having a relatively long period becomes small, and the mooring force of the mooring member is reduced. In other words, while constructing the floating body and mooring members on a small scale and at low cost, it is possible to reliably eliminate not only relatively short-cycle waves during small waves but also relatively long-cycle waves during large waves to improve wave-elimination efficiency. It becomes possible.

The invention described in claim 2 is, for example, as shown in FIG.
As shown in (a) and FIG. 1 (b), in the floating breakwater 10 according to claim 1, the floating body 11 can be rotated by being pushed by a wave (a wave c2 having a relatively long cycle). It is characterized by being moored in tension.

According to the second aspect of the present invention, the tensioned mooring floating body is pushed and rotated by the wave having a relatively long period at the time of a large wave, so that the floating body can be easily and reliably brought near the water surface. Submerge. Therefore, it is possible to easily and reliably extinguish a wave having a relatively long period during a large wave.

The invention according to claim 3 is, for example, as shown in FIG.
As shown in (a) and FIG. 1 (b), in the floating breakwater 10 according to claim 2, the floating body 11 is further provided with a buoyant body 11d.

According to the third aspect of the invention, buoyancy is generated by the buoyant body in the submerged floating body in the vicinity of the water surface during large waves. As a result, the floating body floats above the water surface due to the buoyancy of the buoyancy body when the floating body is submerged in the vicinity of the water surface during a large sea wave. The floating body that floats above the water surface breaks the incoming waves. By the way, the floating body floating from the water surface is submerged in the vicinity of the water surface again by being rotated by being pushed by a wave having a relatively long period. That is, during a large wave, the floating body alternately repeats a state in which a relatively long-period wave that is submerged in the vicinity of the water surface and collapses in shallow water, and a state in which the wave that floats above the water surface and breaks in is broken. As a result, it becomes possible to further improve the wave-dissipating efficiency during large waves.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a floating breakwater according to the present invention will be described below in detail with reference to FIGS. 1 (a) and 1 (b). In FIG. 1, reference numeral 10 indicates a floating breakwater.

A floating breakwater 10 according to the present invention is shown in FIG.
As shown in FIGS. 1 (a) and 1 (b), a floating body 11 capable of floating on the water surface a, and a weight body 12a having the floating body 11 attached to a water bottom b.
The mooring member 12 moored to, the buoyant body 11d provided on the floating body 11, and the like are roughly configured.

The floating body 11 is made of concrete so as to have a hollow portion having a hermetically sealed structure inside, and as shown in FIG. Is formed to the length of.

The floating body 11 has a concave portion 1 when the wave is small.
An upper part 1b of a is floated above the water surface a, and a lower part 1c is submerged in water. The mooring member 12
Is a combination of wires, and the weight 12a is a concrete block.

The buoyant body 11d is made of a rubber compound, wood, plastic, or steel material having a hollow portion, and is provided on the upper portion of the floating body 11 opposite to the concave portion 1a.
The floating body 11 can float from the water surface a by itself, but the floating ability from the water surface a is improved by including the buoyant body 11d.

The operation of the floating breakwater 10 constructed as above will be described below.

The floating body 11 is moored by a mooring member 12 in a tensioned state to a weight body 12a bottomed on a water bottom b so that the upper portion 1b of the concave portion 1a floats above the water surface a during small waves. As a result, the floating body 1 during small waves
1 breaks the wave c1 having a relatively short period by the upper portion 1b of the concave portion 1a.

As the wave condition increases, the lower part 1c of the concave portion 1a of the floating body 11 has a wave c of a relatively long period.
By being pushed by 2, the mooring point 1 by the mooring member 12
It rotates about 2b. By the way, the floating body 11
Since it is tensioned and moored by the mooring member 12, the entire concave portion 1a is submerged in the vicinity of the water surface a by the rotational movement.

As a result, at the time of large waves, a shallow water portion d having a small distance from the water surface a is formed between the entire concave portion 1a and the water surface a. Then, the wave c2 having a relatively long period that has flowed into the shallow water portion d collapses in the shallow water and disappears. Here, the shallow water collapse is, for example, as shown in FIG. 2, when the wave w is located at a shallow depth, the wave w cannot be retained and collapse. (See 1 to 6 in FIG. 2)

Since the entire concave portion 1a is submerged in the vicinity of the water surface a, the resistance that the floating body 11 receives from the wave c2 having a relatively long period is reduced, and the mooring force of the mooring member 12 is reduced. .

Further, buoyancy acts on the floating body 11 submerged by the buoyancy body 11d. As a result, the floating body 11 changes from a state in which the entire concave portion 1a is submerged in the vicinity of the water surface a to a state in which the upper portion 1b of the concave portion 1a floats above the water surface a. And, the upper part 1 of the concave portion 1a that floats above the water surface a
The wave c1 having a relatively short period is broken by b.

By the way, the concave portion 1a that floats above the water surface a
The upper part 1b of the above is swung by being pushed by the wave c1 having a relatively long cycle, and is submerged in the vicinity of the water surface a again. That is,
In the case of large waves, the entire concave portion 1a of the floating body 11 is the water surface a
A state in which a relatively long-period wave c2 that is submerged in the vicinity and flows in is collapsed in shallow water, and a state in which the upper portion 1b of the concave portion 1a floats above the water surface a and breaks the inflowing wave are alternately repeated.
As a result, it becomes possible to further improve the wave-dissipating efficiency during large waves.

As described above, the following effects can be obtained in this embodiment. In the floating breakwater 10, the upper portion 1b of the concave portion 1a of the floating body 11 floats above the water surface a and breaks the wave c1 having a relatively short period during small waves. In the floating breakwater 10, the entire concave portion 1a of the floating body 11 is submerged in the vicinity of the water surface a during a large wave, and the relatively long-period wave c2 flowing in this submerged state is collapsed in shallow water by the concave portion 1a. Therefore, the floating breakwater 10 is not limited to the wave c1 having a relatively short period during small waves,
It is also possible to extinguish the wave c2 having a relatively long period during a large wave. Then, in the case of large waves, the floating body 11 is submerged in water, so that the resistance received from a wave having a relatively long period becomes small,
The mooring force of the mooring member 12 is reduced. That is, the floating body 11
While configuring the mooring member 12 at a small scale and at low cost,
Not only the wave c1 having a relatively short period at the time of a small wave but also the wave c2 having a relatively long period at the time of a large wave can be surely extinguished, and the wave extinction efficiency can be improved.

The tensioned mooring body 11 is pushed and rotated by the wave c2 having a relatively long period at the time of large waves, so that it is easily and reliably submerged in the vicinity of the water surface a. Therefore, it is possible to easily and surely eliminate the wave c2 having a relatively long period during a large wave.

Buoyancy is generated by the buoyant body 11d on the floating body 11 in the submerged state at the time of large waves. As a result, in the event of a large wave, the floating body 11 has its entire concave portion 1a submerged in the vicinity of the water surface a, and the buoyancy of the buoyant body 11d causes the upper portion 1b of the concave portion 1a to float above the water surface a. The upper portion 1b of the concave portion 1a that floats above the water surface a breaks the incoming wave. By the way, the upper portion 1b of the concave portion 1a that has floated above the water surface a is submerged in the vicinity of the water surface a again by being rotated by being pushed by the wave c2 having a relatively long period. That is, in the case of a large wave, the floating body 11 has a state in which the entire concave portion 1a is submerged in the vicinity of the water surface a to cause a relatively long-period wave c2 to collapse in shallow water, and the upper portion 1b of the concave portion 1a floats above the water surface a. And the state of breaking the inflowing wave is alternately repeated. As a result, it becomes possible to further improve the wave-dissipating efficiency during large waves.

The present invention is not limited to the present embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

For example, in the present embodiment, the floating body 1
No. 1 is such that the upper portion 1b of the concave portion 1a of the floating body 11 floats above the water surface a in the case of small waves and the floating body 11 in the case of large waves.
The entire concave portion 1a is configured to be submerged near the water surface a. However, for example, by considering the positions of the centers of gravity of the floating body 11 and the buoyancy body 11d, the concave portion 11a of the floating body 11 can be obtained even in the case of small waves or almost no waves.
It can also be configured so that the whole is submerged. When configured in this way, although the wave breaking performance of the floating breakwater 10 is somewhat reduced, this floating breakwater 10 is used as a structure having a wave breaking performance equivalent to that of the small artificial reefs arranged in double. It is also possible to use.

[0028]

According to the first aspect of the present invention, in the floating breakwater, the floating body floats above the water surface and breaks the wave with a relatively short period during small waves. In this floating breakwater, the floating body is submerged in the vicinity of the surface of the water during a large wave, and in this submerged state, waves of a relatively long period are collapsed in shallow water by the concave portion. Therefore, the floating breakwater can eliminate not only waves having a relatively short period during small waves but also waves having a relatively long period during large waves. Then, in the event of large waves, the floating body is submerged in water, so that the resistance received from a wave having a relatively long period becomes small, and the mooring force of the mooring member is reduced. In other words, while constructing the floating body and mooring members on a small scale and at low cost, it is possible to reliably eliminate not only relatively short-cycle waves during small waves but also relatively long-cycle waves during large waves to improve wave-elimination efficiency. It becomes possible.

According to the invention described in claim 2, claim 1
Of course, the same effect as the invention described in (1) can be obtained, and the tensioned mooring floating body is pushed and rotated by the wave of a relatively long period during a large wave, so that the floating body can be easily and reliably moved. Submerged near the water surface. Therefore, it is possible to easily and reliably extinguish a wave having a relatively long period during a large wave.

According to the invention of claim 3, claim 1
Alternatively, it is of course possible to obtain the same effect as that of the invention described in item 2, and the buoyancy force is generated by the buoyancy body in the submerged floating body near the water surface during a large wave. As a result, the floating body floats above the water surface due to the buoyancy of the buoyancy body when the floating body is submerged in the vicinity of the water surface during a large sea wave. The floating body that floats above the water surface breaks the incoming waves. By the way, the floating body floating from the water surface is submerged in the vicinity of the water surface again by being rotated by being pushed by a wave having a relatively long period. That is, during a large wave, the floating body alternately repeats a state in which a relatively long-period wave that is submerged in the vicinity of the water surface and collapses in shallow water, and a state in which the wave that floats above the water surface and breaks in is broken. As a result, it becomes possible to further improve the wave-dissipating efficiency during large waves.

[Brief description of drawings]

FIG. 1A is a sectional view showing a floating breakwater in the case of a wave having a relatively short period, and FIG. 1B is a sectional view showing a state in the case of a wave having a relatively long period.

FIG. 2 is a schematic cross-sectional view showing how waves break down in shallow water.

[Explanation of symbols]

10 Floating breakwater 11 floating body 11a concave portion 11d Buoyant body 12 Mooring members a water surface c1 Wave with relatively short period c2 Wave with relatively long period

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tadashi Fukumoto             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Hidenori Nishida             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Tsuyoshi Hashimoto             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation F-term (reference) 2D018 BA21

Claims (3)

[Claims] Claims: 1. A floating breakwater in which a floating body that floats from the water surface during small waves and breaks waves is moored so that it can be submerged near the water surface during large waves, and the floating body is provided near the water surface during large waves. Floating breakwater, which is provided with a concave portion that collapses the waves that flow in underwater in shallow water. 2. The floating breakwater according to claim 1, wherein the floating body is tensioned so as to be pivotally movable by being pushed by a wave. 3. The floating breakwater according to claim 1, wherein the floating body is further provided with a buoyancy body.