JP6142461B2 - Improved underwater tsunami mitigation facilities - Google Patents

Description

In order to buffer the power of waves from the sea, such as tsunamis and high waves, it is an equipment installed underwater that has been improved so that it can be easily maintained.

Until now, tsunami protection breakwaters were mainly fixed types using concrete with reinforcing bars, which were large-scale and had huge material and construction costs.
The movable tsunami mitigation equipment that has been invented so far is operated by a complicated device, such as by installing an air chamber, which increases material costs and construction costs, and is not necessarily highly reliable.
In addition, facilities for lightening tsunami mitigation by floating in water have been developed, but the installation method is complicated and involves a lot of construction, which is not economical.

Patent Publication 2010-101097 Patent Publication 7-1119129 JP2013-217173A

To reduce enormous material and construction costs for fixed breakwaters.
Avoid complicated ingenuity and operations required for other movable breakwaters, and ensure that operations can be performed with high reliability by using natural power.
Because it is installed in water using natural materials such as round bamboo, the structure is likely to be corroded and weakened. Therefore, it is easy to replace even under the conditions of underwater installation, and it is regularly maintained to increase durability. about.

To reduce the power of the tsunami to the coast as much as possible, we considered reducing the tsunami underwater. Manufactured with natural materials such as round bamboo and wood that floats in the water, and the buoyancy makes it stand like a wall in the water, buffering the tsunami and reducing disasters.
Marutake has a space inside, and even if water is taken into that space, it can float in the water, so water can be taken in actively, increasing the weight and strength, and increasing the tsunami mitigation effect. An intake port is provided.
On the other hand, Marutake is a natural material, and it will corrode and weaken when kept in water for a long time. Therefore, as a countermeasure against this, a measure that can be easily replaced is added to suppress corrosion and provide durability.

In the present invention, since light and environmentally friendly natural materials such as round bamboo and wood are used, inexpensive material costs and construction costs are sufficient. This facility is centered on a floating body and is installed in the form of a wall in the water. The force of the wave that pushes it in is divided into the force that moves the floating body and the force that lifts the water, thereby buffering and reducing the power of the tsunami.
For the problem that natural materials corrode in water and become weak, by providing regular replacement and drying, a more durable facility is provided.

FIG. 1 is a structural diagram of a breaker cage of the present invention. FIG. 2 is an installation view of the present invention. FIG. 3 is a structure installation diagram corresponding to a coastal facility in the present invention. FIG. 4 is an operation diagram at the time of tsunami mitigation according to the present invention. FIG. 5 is a breakwater maintenance and replacement diagram.

The structure is manufactured in a squid shape by connecting light natural materials such as round bamboo with wires (including strong fiber strings such as cocoons). Redundancy is provided by connecting with 3 or more wires so that it will continue to function even if one breaks. Since the wire is connected through a ring-shaped anchor fitting embedded in the seabed, the coral-like structure spreads into the wall state in the sea due to its buoyancy. One structure is 5-10m long, and when it is spread like a wall in the sea, the length is longer than the sea depth, and the surplus is spread to the sea surface. Increase and last. (See Fig. 1 and Fig. 2)
Individual structures cannot be made very large structures due to limitations such as the length of the material. Therefore, when protecting the coastline widely, a plurality of structures are installed. Actually, as shown in FIG. 3, a plurality of layers are installed in a staggered pattern on the coastline.
The main function of the structure to buffer the power of waves such as tsunami is performed by the following two points.
One point is that the floating body, which is a structural body, is submerged deeply into the sea by the waves, and the traveling direction of the waves is upward, so that the weight of the floating water also reduces the force that the waves travel. Another point is that the force of wave travel is reduced by the amount of resistance when the water passes between the structures. See FIG.
On the other hand, since natural materials such as round bamboo are used in water for a long time, the structure is liable to corrode and weaken. To prevent this, the structure installed in the water is periodically taken out and replaced. The structure taken out is dried on land to prevent corrosion, and reused to improve durability. In order to perform these as equipment maintenance, the wire is extended by a length equivalent to the sea depth so that it can be easily exchanged on the surface of the water. In this maintenance and exchange, an auxiliary float is connected in place of the replaced breakwater, and the newly installed breakwater is maintained in a wall shape. This auxiliary float also acts as a resistance when the tsunami is inundated, so it can also be used for tsunami mitigation.
Moreover, since these facilities float on the sea, they can also be used as auxiliary facilities for preventing drowning accidents by bathers and anglers.

1. Breakwater: A 5-10m long rod-like or columnar structure made of light natural materials such as round bamboo. Wire: A wire mainly composed of fiber cords that connect structures, and is strong and resistant to seawater
2. Make the wire extra long for the same length as the sea depth, connect a new breakwater when replacing it, sink it, make the old breakwater rise, and make it easier to remove. Anchor bracket: A ring-shaped bracket that connects the entire structure through the wire. It is embedded in the seabed, and when the tsunami hits it, the whole breakwater can be strong enough to withstand the tsunami.
4). Auxiliary float: Since the wire is not fixed for maintenance replacement of the breakwater, the float is installed to balance so that the wire will not move and the breakwater will not function normally. When tsunami inundation occurs, it has resistance to inundation and has a function to reduce disasters.

Claims (1)

A wave breaker, which is a structure made of light natural materials such as round bamboo in a cage shape , is spread in the wall state underwater by its buoyancy, and the water that is taken into the structure and the internal space of the structure due to the tsunami Tsunami mitigation equipment that reduces the power of tsunami by moving the tsunami through the gap of the ridge of the structure and reducing its force by friction or changing the direction of travel. Extend the wire connecting the coral as much as it returns to the sea surface through the anchor fittings installed on the seabed, and normally, an auxiliary float is installed ahead of it, and the natural material used in the structure Improved underwater with an auxiliary float that can be easily replaced by removing the auxiliary float and connecting a new breakwater when the corrosion has progressed and maintenance is needed, and pulling out the old breakwater. Tsunami mitigation facilities

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