JPH0762331B2 - Wave control mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave control mechanism applicable to, for example, a breakwater.

[0002]

2. Description of the Related Art Conventional breakwaters have a structure in which weirs of appropriate weight are arranged in a line from the seabed to the surface of the sea, and the wave pressure is used to directly block the total pressure of the waves, and the phase difference between the amplitudes is used to generate waves. Mainly known were structures with attenuating structures.

[0003]

A breakwater having a structure in which the weir of the appropriate weight is linearly arranged from the seabed to the surface of the sea is as follows.
Since almost all the energy of the waves acts on the structure directly as pressure, the structure is heavy and large in scale, and construction of breakwaters in soft ground and deep water requires construction time and cost. It was Further, even in the structure of the breakwater using the phase difference of the amplitude, it becomes large in order to exert the attenuation effect, and the construction of the breakwater on the soft ground or in the deep water area causes a large economical burden. However, there was a problem in that there were cases where construction became difficult. The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a wave control mechanism which has a sufficient wave preventing effect and can also reduce the weight of a structure.

[0004]

The wave control mechanism according to the present invention, which is in line with the above object, has a top surface and a bottom surface that bulge smoothly from the front portion to the rear intermediate portion, and the rear intermediate portion has a maximum thickness. The streamlined horizontal blades, the thickness of which is smooth and sharply reduced from the rear intermediate portion to the rear end, are stacked in a plurality of stages with a gap so that they are located on the water surface, the water surface, and the water. There is.

[0005]

In order to explain the function of the wave control mechanism of the present invention in detail, the functions of the wave and the breakwater will be considered, for example. A wave is a phenomenon in which a swing consisting of a circular motion of water particles propagates and has kinetic energy and potential energy but does not convey a substance. Also, the calmness of the harbor is affected by the vertical movement of the water surface due to the amplitude movement of the waves. From this, it is conjectured that if the breakwater can control waves only for vertical fluctuations of the water surface, the wave pressure acting on the breakwater can be reduced without impairing the function of the breakwater, and the breakwater can be made smaller and lighter. . For this reason, in the wave control mechanism according to the present invention, a plurality of horizontal blades are overlapped with each other with a certain gap, and the vertical surface is spaced from the front to the rear intermediate part on the water surface, on the water, and in the water where the waves propagate. The waves are gradually passed between the horizontal wings over the course of each of the waves, and the upper and lower sides of the wave amplitude of the horizontal wings are restrained, and pressure is applied to the amplitude motion due to the propagation force of the waves and the gradual narrowing of the interval by the horizontal wings. , We decided to control the waves by distorting the amplitude of the waves and smoothly converting the amplitude motion into a horizontal motion. When a wave (amplitude) passes between the horizontal wings, the vertical motion of the amplitude motion is constrained between the horizontal wings, and the wave propagation force and the passage area of the wave by the horizontal wings gradually narrows. Exerts pressure on the swing motion. When pressure is applied to the wave amplitude motion, the amplitude is distorted and the amplitude is smoothly converted into horizontal motion. The movement of water converted into horizontal movement is gentle due to the streamlined shape of the rear part of the horizontal wing. In addition, the wave control mechanism of the present invention has a substantially streamlined shape that does not become a resistance to the movement of the water converted from the amplitude movement to the flow (horizontal movement). The horizontal component of energy will not work. Therefore, if the wave control mechanism of the present invention is applied to, for example, a breakwater, the breakwater body of the breakwater can be reduced in size and weight.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a sectional view of a wave control mechanism according to an embodiment of the present invention, and FIG. 2 is a detailed sectional view of a horizontal blade used in the wave control mechanism. As shown in FIG. 2, the cross section becomes substantially streamlined due to metal such as reinforced concrete, stainless steel, iron, etc., and plastic, and the cross section length varies depending on the place of use, but it is 5 to 60 m (preferably 20 to 40 m). The width is about 10 to 60 m, and a required number of long horizontal blades 12 provided with through holes 10 and 11 at an appropriate pitch are manufactured. And the through hole 1
The support columns 13 and 14 made of reinforced concrete having a predetermined length to be inserted into the 0 and 11 are manufactured in advance, assembled in a factory or on site, and arranged linearly in a predetermined sea to form a breakwater. The support columns 13 and 14 are connected to the through holes 10 and 1, respectively.
1, the through holes 1 are attached to, for example, support columns 13 and 14 in order to keep the horizontal blades 12 at a predetermined interval.
A concrete pipe having a diameter larger than 0 or 11 is used.

Since the horizontal wings 12 are arranged as described above,
As shown in FIG. 1a, the incoming wave amplitude motion changes from circular motion to lateral elliptical motions b and c as it moves from the wide front part to the rear intermediate part, and further rear part. As it moves toward, it is pushed by the horizontal wing whose width is gradually narrowed and changes into horizontal motion d. This means that on a water surface with a free surface, propagating motion of a waveform (amplitude) occurs due to movement of an object, etc., but even if an object is moved in water where the upper and lower surfaces are suppressed by water pressure, it will remain on the water surface. When no wave is generated in the wave and the amplitude motion of the wave is observed in the water tank of the wave experiment, the movement of water particles shows a circular motion on the water surface where the free surface exists.
This can be proved by the fact that the circular motion changes to the elliptic motion to the horizontal motion as the water pressure increases as the water depth decreases. Furthermore, the above effect was also confirmed in a wave experiment using a model, and it can be seen that the wave is converted into horizontal motion when passing through the breakwater, and the wave can be prevented. In the above embodiment, in order to reduce the pressure received per unit area, it is possible to fix the support pillars on the base, which facilitates construction on soft ground.

[0008]

As is apparent from the above description, the wave control mechanism according to the present invention has a function of converting the wave amplitude motion into a horizontal motion. Therefore, when applied to a breakwater, the breakwater of the breakwater Since the body can be made smaller and lighter, it is easy to construct a breakwater on soft ground or in deep water where construction is difficult and the economic burden is large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a breakwater to which a wave control mechanism according to an embodiment of the present invention is applied.

FIG. 2 is a partially cutaway perspective view of a horizontal wing.

[Explanation of symbols]

 10 Through Holes 11 Through Holes 12 Horizontal Blades 13 Support Pillars 14 Support Pillars

Claims (1)

[Claims] 1. The upper surface side and the lower surface side of the front portion to the rear intermediate portion bulge smoothly, the rear intermediate portion has a maximum thickness, and the thickness is smooth and abrupt from the rear intermediate portion to the rear end. A wave control mechanism characterized in that a plurality of substantially horizontal streamlined horizontal blades are stacked in multiple layers with a gap so that they are located on the water surface, the water surface, and the water.