JP2013079557A - Movable tsunami buffer weir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable breakwater which eliminates a complicated mechanism and operation, utilizes natural forces well, and operates with higher reliability.SOLUTION: A breakwater is constituted of a structure made of light material plates and a framework. The structure connects one shaft horizontal column 3 of the framework to an installation surface on a seabed by a hinge form, rises by buoyancy of light materials of the other floating horizontal column 4, plates 1, 2 on front and rear faces, vertical columns 5, and the like and force of waves, like a door mounted on the installation surface with the shaft horizontal column 3 as a revolving shaft, and functions as the breakwater in accordance with water level. The structure is created in a size facilitating handling and easily keeping strength, and a plurality of structures are arranged at intervals in parallel with a target coastline (at target positions of the coastline). The structure rises approximately in the vertical direction and thereafter it is maintained at its position by buoyancy, thus serving as then breakwater. The structure functions as a weir by buoyancy also against backwash, and a plurality of structures are installed in plurality of rows to cope with a large-scale tsunami.

Description

It relates to breakwaters that are installed to prevent damage such as inundation caused by waves from the sea such as tsunamis and high waves.

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. Further, the movable type that has been invented so far is operated by a complicated device by installing an air chamber or the like, and the material cost and the construction cost increase, and the reliability is not necessarily high.

Patent Publication 2010-101097

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.

In order to save material costs, we considered a movable breakwater that uses light materials and functions as a breakwater instead of a fixed one. The mechanism required to make the movable structure function as a breakwater is highly reliable, and a mechanism that provides sufficient operating force is required. The buoyancy when the structure is submerged in water is suitable. Invented to utilize.
From these points, we have devised a mechanism that works effectively and functions sufficiently as a breakwater.

In the present invention, since light and environmentally friendly materials are mainly used, inexpensive material costs and construction costs are sufficient. This device is movable, installed face down on the ground, etc., and in the event of an emergency, it rises with the power of buoyancy and rushing waves in the rushing water and acts as a breakwater, so it does not get in the way of the eyes, There is also an effect of weakening the power of, and a wave-breaking effect corresponding to the height of the rising weir can be achieved.
Moreover, since it functions as a weir by buoyancy against a pulling wave, it helps to reduce disasters.
Moreover, since it can also be set up in the sand, it can prevent a disaster in a scenic area without obstructing the scenery.

FIG. 1 is a structural diagram of a structure (Boseki) according to the present invention. FIG. 2 is an installation view of the present invention. FIG. 3 is a diagram showing an operation when buffering a tsunami according to the present invention. FIG. 4 is an installation assumption diagram corresponding to the large-scale tsunami of the present invention.

The structure is made of a light material board and frame. One pillar of the structure frame is connected to the installation surface in a hinge form, and the structure itself rises like a door attached to the installation surface (using buoyancy and wave forces to weaken the power of waves) Depending on the water level, it functions as a breakwater.
・ Since the structure is easy to handle and has a size that can maintain strength, it is difficult to play the role of a breakwater for a whole coastline with a single structure. Therefore, in order to fulfill the function as a unified breakwater, it is possible to arrange a plurality of structures parallel to the target coastline (at the target position of the coastline) with a certain gap. (See Figure 4)
・ The structure is made of light materials, and it is unrealistic to give it the strength to completely suppress a strong tsunami. Make some gaps between the bodies, and give them some flexibility so that they can lean to the mountain side. As a result, some water enters the land side from the breakwater, but since the movement of most tsunamis up to the height of the weir can be suppressed, a corresponding effect can be expected.
・ Due to the strength of the structure, it is not possible to give a row of structures a very high breakwater effect. A large-scale tsunami can be handled by installing the structures in multiple rows at some distance. (See Figure 4)

1. Mountain board: A board that stands on the mountain side during operation and has confidentiality and strength.
2. Sea plate: A plate that stands on the sea side during operation, and has an opening for taking in water that pushes up to the upper part, and an opening for extracting sand and rubble coming into the lower part. Axial horizontal column: A horizontal column that becomes the installation surface side during operation, and is joined in hinges to joints at multiple locations (three or more points) provided on the ground surface.
4). Floating horizontal column: A horizontal column that floats on the water during operation, and also has the role of preventing sand and debris from invading the structure during normal times (keep the structure as hollow as possible).
5. Vertical pillar: A pillar that moves vertically during operation, and increases the strength of the pile and sea plate. Hinge type joint: A part that connects the horizontal shaft and the installation surface, and is fixed to the installation surface with a pile. Give strength so that it will not slip or come off when it is flooded.

Claims (4)

It is a movable tsunami buffer weir that uses light materials for the structure and rises using the power of buoyancy and waves when it enters the water to reduce the power of the tsunami. The main structure is a light material frame sandwiched between light material plates, shaped like a door, and installed along the ground or wall. (Thus, less material is required, and the situation at the time of installation does not obstruct the landscape. If a material that does not adversely affect the environment is adopted, it is environmentally friendly from multiple viewpoints.) The structure takes in the water that rushes into it first, increases its weight, and improves its strength. (Thus, it is not necessary to fill the entire structure with the material, and the material cost can be reduced.) The structure gains buoyancy naturally by entering the water when the water comes in, the sea side part starts to rise, and the gravity of the water taken in is also used as the water level rises Then, the energy of the tsunami that rushes later is consumed, and it rises until the sea side becomes vertical. After the water level reaches the same level as the weir, it continues to function as a weir while maintaining a nearly vertical position by buoyancy.

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