JPH0596119U - Submarine - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a submerged dike that has a high wave-dissipating effect and is easy to construct. [Structure] A pile 2 provided on a water bottom, a support plate 3 fixed to the pile, a deformable bag body 4 attached to the support plate 3, and a piston 5 arranged substantially horizontally below the water surface.
A submarine consisting of a piston 5 depending on the fluctuation of the wave.
Fluctuates up and down, canceling the waves. [Effect] A sufficient wave-dissipating effect can be obtained regardless of the tide difference. Also, a submerged dike can be easily constructed even on the water bottom of soft ground.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a submerged dike arranged in water. In particular, it relates to submerged dikes with a high wave-dissipating effect.

[0002]

[Prior Art]

 Conventionally, there is a submerged dike in which a kamaboko-shaped bag that is filled with fluid to eliminate waves is fixed to the sea floor. (See JP-A-1-83704 and JP-A-1-83705)

[0003]

[Problems to be solved by the device]

 The conventional one has the following problems. <a> The conventional dam body needs to have a sufficiently large width in order to enhance the wave-dissipating effect. <B> The crest level of the conventional levee body is a certain height from the bottom of the water, and when the water level rises due to the tide level, sufficient wave-dissipating effect cannot be obtained against fluctuations. <C> When installing on soft ground, it was necessary to improve the ground or devise measures to reduce the ground reaction force.

[0004]

[Purpose of the present invention]

 An object of the present invention is to provide a submerged dike having a simple structure and a high wave-dissipating effect. Furthermore, it aims to provide a submerged dike that can obtain a sufficient wave-dissipating effect regardless of the difference in tide level. Furthermore, it is to provide a submerged dike that can be easily constructed even on the bottom of soft ground.

[0005]

[Means for solving problems]

 The present invention relates to a submerged bank, in which a stake provided on the bottom of the water, a support plate fixed to the stake, a piston arranged substantially horizontally below the water surface above the support plate, the support plate and the support plate. A bag attached to the piston, a fluid is sealed in the bag, and the piston is vertically movable with respect to the support plate. The submerged bank and the bag are donut-shaped. And the upper part of the pile is arranged in the donut shape.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an example of the submerged bank 1 of the present invention. <A> Submerged dike 1 Submerged dike 1 is installed offshore such as a beach and a marina, and is submerged in water so as not to damage the scenery and used as a breakwater. As a result, the rough seas can be extinguished offshore, making it the best beach for beaches and marinas. For example, it is installed on the line offshore in parallel with the coastline. The submerged bank 1 is composed of a pile 2 buried in the seabed, a support plate 3 held by the pile, a bag body 4, and a piston 3.

<B> Pile 2 The pile 2 is vertically buried in the seabed as a foundation of the submerged bank 1. Since the pile is used as the foundation of the submerged dike 1, even if the ground at the bottom of the water is soft, all that is required is to drive the pile, and no special work such as ground improvement is required. As the pile 2, for example, a steel pipe with corrosion prevention is used, and it is necessary to withstand waves and corrosion. . <C> Support Plate 3 The support plate 3 is fixed to the pile 1. The shape may be, for example, a disk shape having a hole through which the pile 1 penetrates. If the cross-sectional shape of the pile 1 is uneven as shown in FIG. 3, the holes of the support plate 3 are formed so as to mesh with the unevenness. As a result, the support plate 3 can be prevented from rotating around the pile.

<D> Bag Body 4 The bag body 4 is made of a deformable film, and the lower portion thereof is fixed onto the support plate 3. As an example, the bag body 4 has a donut shape, and the pile 1 can be inserted into the center thereof. For the bag body 4, a flexible and highly durable material is selected. The inside of the bag body 4 is filled with a deformable medium, for example, a gas such as air or a liquid. Then, the bag body 4 is crushed or expanded vertically depending on the fluctuation of the wave. <E> Piston 5 The piston 5 is provided on the upper portion of the bag body 4 and moves up and down with respect to the support plate 3 according to the deformation of the bag body 4. Therefore, the piston 5 is constantly kept approximately horizontal. As an example, the piston 5 is a plate-shaped member and has a hole through which the pile 2 penetrates in the central portion. Then, the doughnut-shaped bag body 4 expands and compresses only in the vertical direction, and accordingly the piston 5 moves vertically. Further, even if the pile does not penetrate inside, the piston 5 and the support plate 3 may be connected by a pipe slidable inside the bag body so that the piston 5 does not shift laterally.

The operation of the submerged bank 1 will be described below with reference to FIGS. 4 to 6. <B> Operation corresponding to tide level The submerged dike 1 is arranged below the water surface, and the piston 5 on the upper part of the bag body 4 is constantly located near the water surface. At high tide, the bag body 4 is deformed so as to extend upward, and the piston 5 rises near the water surface. On the other hand, when the tide is low, the bag body 3 is deformed so as to contract downward, and similarly the piston 5 is lowered to near the water surface. Since the piston 5 is always present near the surface of the water, it is always strongly influenced by the waves, and as a result, the effect of canceling the waves is great.

<B> Principle of Wave-Dissipation FIG. 4 shows the principle of wave-dissipation when the piston 5 does not move up and down. When the incident wave 11 collides with the submerged dike 1, a reflected wave 12 is generated and interferes with the incident wave 11. As a result, the incident wave 11 and the reflected wave 12 interfere with each other on the offshore side, and the weakened transmitted wave 13 occurs on the shore side. When the piston 1 vibrates up and down, a wave as shown in FIG. 5 is generated. That is, the target oscillating wave 14 is generated on the offshore side and the shore side. Therefore, in practice, when the incident wave 11 travels from offshore, it collides with the submerged dike 1 to generate a reflected wave 12, and the movement of water by the incident wave 11 moves the piston 5 up and down. As a result, a synthetic wave as shown in FIG. 6 is generated. The incident wave 11, the reflected wave 12 and the vibration wave 14 interfere with each other on the offshore side, and the transmitted wave 13 and the vibration wave 14 interfere with each other on the shore side. As a result, the wave-dissipating effect is enhanced on the shore side. In addition, when the peak of the incident wave 11 passes through the submerged bank 1, the piston 5 of the submerged bank 1 is lifted up, and the height from the water surface to the piston 5 is reduced. Therefore, the breakwater is easily broken on the submerged dike, energy loss occurs, and the incident wave is weakened.

[0011]

[Effect of the device]

 As described above, the present invention can obtain the following special effects. <a> The width of the levee body is not so large, and a simple structure can be expected to have a sufficient wave-dissipating effect. <B> Since the piston moves up and down, the wave-dissipating effect can be obtained regardless of the tide difference. <C> Since the structure is set on piles, it can be installed on soft ground or without sufficient ground improvement. <D> Because it is on the seabed, even if it is installed offshore such as a beach or marina, it does not damage the scenery.

[Brief description of drawings]

FIG. 1 is a side view of a submerged dike in an extended state.

FIG. 2 is a side view of the submerged dike in a contracted state.

FIG. 3 is a top view of the submerged dike.

FIG. 4 is an explanatory diagram of wave cancellation by a reflected wave.

FIG. 5 is an explanatory view of wave generation due to movement of a submerged dike.

FIG. 6 is an explanatory view of wave breaking by a submerged dike.

Claims (2)

[Scope of utility model registration request] 1. In a submerged dike, a pile provided on the water bottom, a support plate fixed to the pile, a piston arranged above the support plate and below the water surface, and attached to the support plate and the piston. A submerged dike, characterized in that the bag is sealed with a fluid, and the piston is vertically movable with respect to the support plate. 2. The submerged dike according to claim 1, wherein the bag body has a donut shape, and the upper part of the pile is arranged in the donut shape.