JPH047219Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a floating breakwater that is moored and installed offshore at deep or medium depths.

(Prior art) Conventionally, floating breakwaters have been constructed by floating an air tank-shaped float on the water surface and mooring it to the seabed with an anchor, and the float resists the up and down movement of waves to block the progress of the waves. Monoya (Jitsukai 49-79039
No.) A similar float with wave shielding plates etc. protruding above and below (Special Publication No. 14029/1972) is known.

(Problems that the invention aims to solve) Conventional floating breakwaters have a structure in which the anchors prevent the floating from rising, so there are problems with the reliability of mooring, and the range of waves that can be dissipated is limited. The problem was that sufficient wave-dampening effects could not be obtained throughout the year.

In consideration of these conventional problems, the present invention aims to provide a floating breakwater that can achieve almost the same wave-dissipating effect as a gravity-type breakwater installed on the seabed, and also has sufficient mooring reliability. .

(Means for Solving the Problems) The configuration of the present invention for solving the above-mentioned problems includes an inclined wall rotatably connected to a mooring foundation constructed on the seabed, The wall has its front face facing the wave propagation side, its upper side tilted backwards, its upper end protruding above the water surface, and its lower end extending close to the seabed. The floating breakwater is provided with a buoyant body formed integrally with the inclined wall on the upper rear surface.

(Function) In this floating breakwater, the waves that hit the front of the sloped wall that slopes backward go up that slope, consume their own energy, and when they return,
It fills the trough of the next wave or collides with the crest of the next wave to attenuate its energy.

In addition, at this time, the wave force is divided into horizontal direction and vertical downward direction on the buoyant body, and the buoyant force of the buoyant body opposes this, and only horizontal force acts on the mooring foundation. .

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

This floating breakwater consists of a mooring foundation constructed on the seabed.
have. In this foundation 1, a concrete foundation 1b is integrally provided on the upper surface of a foundation pile 1a buried in the seabed, and a mooring tool 2a constituting a hinge 2 is protruded from the upper surface of the concrete foundation 1b.

The lower end of the inclined wall 3 is moored to this mooring base body 1 . The inclined wall 3 is made of concrete and has a mooring fitting 2b protruding from its lower end surface, which is connected as a rotatable hinge 2 to the above-mentioned mooring fitting 2a, so that the lower end of the inclined wall 3 is on the seabed. It has been extended to Kinbo.

In addition, the inclined wall 3 has its upper end inclined toward the rear at an angle of approximately 30° with respect to the horizontal, and is formed with a length such that its upper end protrudes above the water surface enough to dissipate waves even at high tide. A wave return 4 is integrally molded at the upper end.

A hollow floating body 5 is integrally formed on the back surface of the inclined wall 3.

This buoyancy body 5 is shaped so as to have a buoyancy that allows the inclined wall 3 to maintain an angle of approximately 30 degrees at the above-mentioned tide level state.

The wave-resistant structure composed of the inclined wall 3 and the buoyant body 5 constructed in this manner is constructed in a caisson yard, a dry dock, a graveyard, a floating dock, etc.

Once built, the structure is self-floating and transported by tugboat or loaded onto a barge.

This is launched at the installation site and hingedly connected to the mooring foundation 1. The interior of the wave-resistant structure will be divided into watertight compartments, and will be able to sink and float by pouring in water.

In addition, in the above-mentioned embodiment, the inclined wall and the buoyant body are constructed of concrete, but they may also be constructed of steel, or they may be made with unevenness on the inclined surface to dissipate waves. It's good.

The balance of force against wave force on a floating breakwater constructed in this way can be explained with reference to Figure 2. In the figure, H is the resultant force of the horizontal buoyant force, h is the water depth α・h is the position of action of the horizontal wave force, and W is the point of action of the horizontal wave force. Weight U is the buoyancy force acting on the structure e is the distance between the points of application of weight and buoyancy Rh is the horizontal reaction force of the foundation Rv is the vertical reaction force of the foundation hu is the height at which the buoyancy force acts.

In this case, the horizontal force balance is H-Rh=O, so Rh=H. The vertical force balance is U-W+Ru=O, so Ru=W-U. The moment balance around the hinge point is Hαh. −Uhucotθ+W(hucotθ−e)=O, so U=Hαh/hutanθ+(1−e/hutanθ)W Now, suppose h≒hu=10m H=60t/m α=0.7 θ=30° e=0 , the required buoyancy at this time is U=60×0.7×0.577+W=24.2+W (t/m).

(Effects of the invention) The floating breakwater of the invention is constructed as described above, with the inclined wall lying backward with the front facing the wave propagation side and supported by the buoyant body on the back, and the lower end near the seabed. By extending the mooring to the mooring foundation on the seabed, the wave force acts on the mooring foundation in a horizontal direction and in a downward direction on the buoyant body. The reliability of the mooring was significantly increased as no upward force was applied to the foundation, and the wave dissipation effect on the slope in front of the slope wall was similar to that of a gravity-type breakwater, allowing it to be used over a wide area. This results in a good wave-dissipating effect against waves of high wave height.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention.
The figure is a longitudinal cross-sectional view, and FIG. 2 is a diagram showing the balance of forces. 1... Mooring foundation body, 2... Hinge, 3... Inclined wall, 5... Buoyant body.

Claims (1)

[Scope of utility model registration request] It is equipped with a sloped wall rotatably connected to a mooring foundation built on the seabed, and the sloped wall has its front face facing the advancing side of the waves and its upper side tilted backwards. The length is such that it does not protrude above the water surface, and the lower end extends to the vicinity of the seabed.
A floating breakwater comprising a buoyant body formed integrally with the inclined wall on the upper rear surface of the inclined wall.