JP2554145B2 - Deepwater Floating Breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a deepwater floating breakwater.

[Conventional technology]

In order to ensure the calmness of specific sea areas such as aquaculture farms and yacht harbors, the installation of bottom-type breakwaters is considered to be the most reliable, but construction technology, construction costs, or construction costs due to the topographical conditions and water depth of the sea area or Floating type breakwaters (floating breakwaters) may be adopted because of the necessity of removal and relocation.

In the floating breakwater, a floating body part that floats on the water surface and cancels the wave,
Various structures have been manufactured or proposed in the past, including a mooring device portion for fixing a floating body portion to a predetermined position, but roughly classified into a pontoon type and a vibration control type.

First, in the pontoon type, as shown in the side view of FIG. 2, a box-shaped floating body 01 made of steel or concrete having a rectangular cross section is connected to an anchor 03 on the seabed by a mooring line 02 made of a chain or a wire. ing. In this floating wave breakwater, the incident wave 04 is reflected on the front surface of the floating body 01, and the transmitted wave 05 is attenuated by the energy consumption due to the up-and-down shaking of the floating body, so that the wave canceling action is performed.

Further, in the shaking control type, as shown in FIG. 3, very short waves are reflected by the outer wall of the floating body, and relatively short waves are made of steel floating body.
The movement of water inside 01 adjusts the sway of floating body 01 due to the wave, suppresses transmitted wave 05 by using the phase difference between the incident wave 04 and the wave created by floating body 01, and the long wave uses the ups and downs of the floating body The energy loss of water flowing in and out from the bottom of the mooring line is the same as the pontoon type.
It is moored to the undersea anchor 03 via 02.

[Problems to be Solved by the Invention]

However, since all floating breakwaters of this type are moored to anchors on the seabed by mooring lines,
The hem of the mooring structure expands greatly, so when the water depth is large,
The horizontal distance between the floating body and the anchor becomes very large, resulting in the following problems.

(1) The quantity of mooring lines increases.

(2) The area occupied by the mooring equipment will increase, which will affect the free navigation of navigating vessels.

(3) Due to the large skirts of the mooring equipment, it is not possible to install the mooring equipment close to the sea area that should be calmed down, so the length or radix of the floating breakwater increases.

The present invention has been proposed in view of the above circumstances, and the mooring structure does not become large even when the water depth is large, and the cost is low and the economical deep water depth is eliminated, which eliminates the influence on ships navigating in the vicinity. The purpose is to provide a breakwater.

[Means for solving the problem]

To this end, the present invention relates to a horizontally elongated cubic floating body which floats on the sea surface and attenuates the transmitted wave by consuming the energy of the incident wave by reflection of the incident wave, eddy, friction and movement of the floating body; It comprises a horizontal weight having almost the same width and the same length as the floating body, and a mooring line that is stretched loosely in the sea in a wide skirt and anchors the weight to a plurality of anchors laid on the seabed. Characterize.

[Action]

According to such a configuration, the horizontal expansion of the mooring device is only due to the portion of the mooring line obliquely installed in a loosely mooring manner between the weight and the anchor, and therefore is affected by the water depth. Since it disappears, it is possible to solve the problem of the skirt expansion of the mooring device due to the increase in water depth as described above.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view thereof.

In the above figure, 01 is a pontoon type floating body having a rectangular cross section and having an oblong rectangular parallelepiped shape, which reflects a part of an incident wave 04 and attenuates a transmitted wave 05. The floating body 01 has a horizontal cuboid weight 07 suspended in water by a vertical suspension line 06 consisting of a plurality of chains or wires suspended at its front and rear ends, and the weight 07 is stretched widely. A plurality of mooring lines 02 are used for relaxing mooring to a plurality of anchors 03 sunk on the seabed.

Although the pontoon type is used as the floating body in this embodiment, any type of floating body intended for a floating breakwater can be used conventionally. However, consideration must be given to increase the buoyancy corresponding to the weight of the weight 07.

〔The invention's effect〕

Such a deep-water floating breakwater acts as a conventional floating breakwater, and the horizontal distance between the floating breakwater and the anchor on the seabed does not increase with increasing water depth. Therefore, the following effects can be obtained.

(1) The mooring device only needs to lengthen the length of the suspension line according to the water depth. By the way, the length of the mooring line is required to be 2-3 times the depth of the water in the conventional floating breakwater.

(2) Since the mooring line stretched wide at the bottom is only between the weight and the anchor suspended inside near the seabed, the area of the sea area occupied by the mooring device does not increase.

(3) Accordingly, the floating breakwater itself can be installed close to the calming target sea area.

(4) It is conceivable to omit the mooring line by sinking the weight itself as a sinker on the seabed and using the suspension line as a tension leg to pull the floating body with a strong tension. Since it is immovable in the vertical direction, the wave-dissipating action using the up-and-down motion of the floating body is also lost, so it is not a good idea from a comprehensive viewpoint as a deep-water floating wave breakwater.

In short, according to the present invention, a horizontally elongated cubic floating body which floats on the sea surface and attenuates the transmitted wave by consuming the energy of the incident wave by reflection of the incident wave, vortex formation, friction and movement of the floating body, and is suspended from the floating body. A horizontal weight having substantially the same width and the same length as the floating body, and a mooring line which is stretched loosely in the sea to anchor the weight to a plurality of anchors laid on the seabed. As a result, the mooring structure does not become large even if the water depth is large, and an economical deep water floating breakwater with a bottom cost that eliminates the influence on ships traveling in the vicinity is obtained. Therefore, the present invention is extremely useful industrially. Is.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention. 2 and 3 are side views showing known floating breakwaters, respectively. 01 …… Floating body, 02 …… Mooring line, 03 …… Anchor, 04…
… Incoming wave, 05 …… Transmitted wave, 06 …… Suspension line, 07 ……
Weight.

Claims (1)

(57) [Claims] 1. An oblong cubic floating body which floats above the sea surface and attenuates the transmitted wave by consuming the energy of the incident wave by reflection of the incident wave, eddy, friction and movement of the floating body, and the floating body suspended from the floating body. A horizontal weight having almost the same width and the same length as the above, and a mooring line which is stretched loosely in the sea to anchor the weight to a plurality of anchors laid on the seabed. Deep water floating breakwater.