JPS5934578Y2 - 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, a floating breakwater propagates 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 have the following types: (1) Measures the dissipation of wave energy through friction, vortex formation, etc.

(2) Something that uses wave reflection.

(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, for example, there is one that gives motion to a floating body using a mechanical mechanism and dissipates waves by giving a specific phase difference to that motion (Japanese Patent Publication No. 53-26266), which Due to its large size, large-scale mechanical equipment is required, making it difficult to put it into practical use.

In addition, a passive agitation control tank is installed inside the floating body, and it agitates with a specific phase difference to dissipate waves (Japanese Patent Laid-Open No. 53-1
15533, Japanese Patent Application Laid-Open No. 115534/1983), but this has the disadvantage that the floating wave bank has a relatively deep draft, requires a large mooring force, and the reflected waves are also large.

The present invention has been devised in view of the above, and embodiments thereof will be described below based on the drawings.

Reference numeral 1 denotes a bottomless box-shaped tank, the interior of which is divided into three parts by left and right partition walls 2A and 2B in the traveling direction X of the incident wave.

A suitable number of ventilation holes 4 are formed in the top plate 3a of the central tank chamber 3A, and the left and right tank chambers 3B and 3C are communicated with each other via a communication pipe 5 provided between their upper portions.

As shown in the figure, one side wall of the box-shaped tank 1, that is, the outer wall 6A on the side receiving the incident wave, has a curvature that extends in the direction of incident wave propagation X, and its lower end (submerged end) A hollow floating body 7A is provided so as to extend inward of the tank chamber 3B.

The other outer wall 6B is configured as a vertical flat plate, and a hollow floating body 7B is provided at its lower end (submerged end) so as to project outward from the tank chamber 3C.

According to such a structure, an incident wave is reflected at the front surface of the outer wall 6A having a certain curvature, and the rest is transmitted, but the reflected wave is larger than that by a simple vertical wall.

Therefore, the wave transmittance is reduced and the wave-dissipating effect is improved.

The waves transmitted through the outer wall 6A are transmitted to the tank chambers 3B, 3A, 3.
C, but at that time, tank rooms 3B, 3. A,
The water column in 3C moves up and down, and the air flow passing through the ventilation hole 4 and the communication pipe 5 encounters a certain resistance, so energy dissipation occurs, and wave energy is absorbed by that amount.

Therefore, the waves transmitted through the other outer wall 6B become smaller.

Since the floating bodies 7A and 7B are both submerged under the water surface, the water line area becomes small.

Therefore, the force of the waves that the floating wavebank itself receives is reduced, the oscillation is reduced, and the draft is reduced.

This is advantageous in keeping the mooring force small, and it is possible to effectively attenuate the up-and-down, lateral, etc. of the floating wave bank only by the submerged suspended sinker.

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

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

(2) Since the draft can be made shallow, the mooring force can be reduced.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of the implementation of the present invention. 1... Box-shaped tank, 2A, 2B... Compartment wall, 3A, 3B, 3C... Tank room, 4...
...Vent hole, 5...Communication pipe, 6A, 6B.
...Outside wall, 7A, 7B...Floating body, X.
...Incoming wave traveling direction.

Claims (1)

[Scope of utility model registration request] It comprises a bottomless box-shaped tank and a floating body integrally provided at the submerged ends of the left and right outer walls of this tank, and the outer walls that receive incident waves have a curvature extending in the direction of propagation of the incident waves. A floating wave levee characterized in that the floating body on the outer wall is configured to extend inwardly from the tank, and the floating body on the other outer wall is configured to extend outwardly from the tank.