JPS5934579Y2 - floating wave bank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a floating wavebank, and its purpose is to obtain an inexpensive and high-performance floating wavebank.

Floating breakwaters have the advantages of not interfering with seawater exchange, being able to be constructed even at deep water depths, and being easy to move and remove, so they are said to protect offshore marine structures and coastal aquaculture and fishing grounds from waves in the open ocean. used for such purposes.

However, unlike a gravity-type embankment-type breakwater, which prevents waves from traveling through complete reflection, floating breakwaters propagate as transmitted waves, except for a portion of the incident waves that become reflected waves.

Therefore, in order to improve the performance of floating wavebanks, an important issue is how to keep the wave transmittance low.

The floating wave breakers that have been proposed so far are of the following types: (1) Measures the dissipation of wave energy through friction, vortex formation, etc.

(2) Something that uses the reflection of waves.

(3) A type that utilizes interference between waves generated by the movement of a floating body and incident waves.

(4) A combination of the above (1) to (3).

Three of these can control the motion of the floating body to eliminate waves, and it has been proven by wave-making theory that ideally both reflected waves and transmitted waves will be zero.

As this type of floating wave dam, there is one (Japanese Patent Publication No. 53-26266) that dissipates waves by imparting motion to a floating body using a mechanical mechanism and making that motion have a specific phase difference. Increasing the size requires large-scale mechanical equipment, making it difficult to put it into practical use.

In addition, a passive agitation control tank is installed inside the floating body, and waves are dissipated by agitation with a specific phase difference (Japanese Patent Laid-Open No. 531155
33, Japanese Patent Application Laid-open No. 53-115534), but this has the drawback that the draft of the floating wave bank is relatively deep, requiring a large mooring force, and the reflected waves are also large.

The present invention has been devised in view of the above, and one embodiment thereof will be described below.

In the figure, 1 is a concrete bottomed tank;
This is constructed to be elongated in a direction perpendicular to the wave traveling direction A, and is floated on the ocean in this direction.

That is, this bottomed tank 1 has a long box shape, and
Solid projecting parts 2, 2 projecting outward are integrally provided at the submerged ends (lower ends) of the left and right side walls IA, IA.

These projecting parts 2, 2 are configured to be long along the edge of the submerged end part, and the outer peripheral surface thereof is a circular arc surface 2A in cross-sectional view.
, 2A.

According to the floating breakwater, the bottomed tank 1 ensures the buoyancy of the floating breakwater itself.

According to this configuration, the projecting portions 2, 2 are the left and right side walls IA of the bottomed tank 1.

1A, so when it is shaken by an incident wave, these projecting parts 2, 2 work to reduce wave-making resistance, just like the bow valve of a ship.

Then, a divergent wave is generated by the movement of the projecting parts 2, 2, and this divergent wave interferes with the reflected wave and the transmitted wave, and these waves are dissipated.

Furthermore, since it is made of concrete, it not only improves its durability, but also increases its weight, making ballast water and sinkers unnecessary for offshore installation.

Note that if the bottomed tank 1 is configured with a pibrid structure that is a composite structure of concrete and steel, the durability will be further improved and the tank will be sturdy.

As described above, the present invention provides the following effects.

(1) Although it has a simple configuration and is easy to handle, a high performance and highly durable floating wavebank can be obtained.

(2) Since the draft can be made shallow, no mooring force is required, or even if mooring force is required, it can be made small.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of an embodiment of the present invention. 1... Bottomed tank, 1A... Bottomed tank side wall, 2... Overhang, 2... Arc surface.

Claims (1)

[Scope of utility model registration request] A floating wave bank consisting of a hollow bottomed concrete tank, characterized in that solid overhangs projecting outward are integrally provided at the submerged ends of the left and right side walls of the tank.