JPH0410923B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling waves, etc., and more particularly to a method for controlling waves, etc. without damaging the landscape.

[Prior art and its problems] Conventionally, breakwaters made of caissons, offshore breakwaters made of submerged breakwaters, wave-dissipating blocks, etc. are often used to protect against waves on relatively shallow coasts. The drawback is that the design needs to be adapted to natural conditions, which increases the scale of the structure and increases construction costs and construction time.

Therefore, proposals have been made to reduce waves, etc. by arranging several cylindrical cells or steel pipe piles (Utility Model Application Publication No. 156926/1983,
159417, Japanese Patent Application Laid-open No. 159417 and JP-A-59-206524), considering changes in tide level, wave height, etc., the wave-dissipating effect is greater near the sea level, so the pile head is usually designed to protrude above the sea level. Become. Therefore, there was a problem that it did not match the natural landscape.

[Object of the Invention] Therefore, the object of the present invention is to provide a method for controlling waves, etc., which is economical without the need for designing for excessive wave loads, and which does not harm the natural landscape. .

[Means for Solving the Problems] The present inventor has conducted intensive studies to solve the above-mentioned excessiveness, and as a result, has arrived at the present invention.

That is, the method for controlling waves, etc. according to the present invention is a method for controlling waves, etc. by driving a plurality of steel pipes into the seabed and arranging them, in which a floating pipe is placed above the steel pipes and can move up and down a predetermined distance inside or outside the steel pipes. established,
The floating tube is characterized by being raised and lowered according to the tide level.

The present invention will be explained in detail below.

In the present invention, the method of arranging the plurality of steel pipes driven into the seabed is not particularly limited, and in addition to the descriptions in the above-mentioned publications, Japanese Patent Application Laid-Open No. 59-206508 and Japanese Utility Model Application No. 53-147537
No. 54-106030, etc. can be referred to. For example, a plurality of rows may be arranged in parallel or diagonally at right angles to the waves, or may be arranged in a staggered manner with respect to the waves. The number of rows of steel pipes is preferably two or more, but the wave-dissipating effect is significant if at least one steel pipe is present in the direction of wave propagation. The spacing between the steel pipes is determined in relation to the wavelength at the location where they are to be installed, but from the viewpoint of wave-dissipating effects, it is preferable that the spacing be small.

In the present invention, "making the floating pipe rise and fall according to the tide level" means that it is sufficient to make the floating pipe rise and fall at least according to the ebb and flow of the tide, and does not necessarily mean that the floating pipe can be made to rise and fall according to the ebb and flow of the waves. This means that there is no need to move up and down.

The structure of the pile used in the present invention will be explained based on FIG. 1.

FIG. 1 is a schematic sectional view showing one example of the structure of a pile used in the present invention, and FIG. 2 is a schematic sectional view showing another example of the structure of a pile used in the present invention.

In FIG. 1, 1 is a steel pipe driven into the submarine ground 2. A hole 3 through which seawater passes is provided in the outer peripheral portion of the steel pipe 1. The diameter of the pore 3 may be such that it is not easily clogged by, for example, algae. The lower part of the steel pipe 1 may be open, but it is preferably closed as shown.

4 is a floating tube which can be moved up and down a predetermined distance above the steel tube 1 inside or outside the steel tube 1, and forms a float whose upper part is sealed and a space 4A is formed inside.
5 is a weight for adjusting the tip of the floating tube 4 so that it is approximately equal to the sea level WL. Reference numeral 6 denotes a stopper, which limits the floating amount of the floating tube and prevents the floating tube from falling off. 7 is a locking portion provided on the floating tube 4.

Note that the floating pipe 4 is not limited to steel, and may be made of synthetic resin or the like having excellent impact resistance. In this case, if the floating pipe 4 is designed so that all of it is accommodated within the steel pipe 1, it will be easy to drive the piles.

As a result of the above configuration, when waves come from the right side as shown in the figure, a wave-dissipating effect is exerted,
Moreover, the floating pipe 4 rises and falls according to the ebb and flow of the tide. Further, the tip of the floating tube 4 may be designed to move up and down depending on the height of the waves. Furthermore, by painting the entire or upper part of the floating pipe 4 in the same color as seawater, the scenery can be better maintained.

Next, another example of the structure of the pile used in the present invention will be explained based on FIG. The structure shown in the figure is steel pipe 1
A floating tube is installed on the outside of the tube so that it can be moved up and down a predetermined distance.

In the figure, a sealed float 4A is formed on the upper outer periphery of the floating tube 4, and a weight 5 is formed on the lower outer periphery of the floating tube 4. A hole 3 through which seawater passes is formed in the upper part of the floating pipe 4, and is not formed in the steel pipe 1. Other parts with the same reference numerals as in FIG. 1 have the same configuration, so their explanation will be omitted.

By arranging one or more rows of piles having the above configuration against waves, the waves can be interfered with and dissipated. In addition, a continuous wall may be constructed by using steel pipe sheet piles to narrow the distance between the piles.

Although one embodiment of the present invention has been described above,
The present invention is not limited to this. For example, if necessary, the tip of the floating tube may be slightly submerged below the sea surface, and a "buoy" or the like may be provided above it. Further, the shape of the pile is not limited to a cylinder, but may be a square pillar with an internal cavity.
Furthermore, it is also possible to combine the method of the present invention with conventional offshore breakwaters.

It is also known that the corrosion rate of seawater on steel is usually highest in the splash zone or tidal zone, and is relatively slow in seawater. Therefore, by making the upper part movable, only the upper movable part that corrodes the fastest can be replaced, and the life of the entire structure of the pile can be extended at low cost.

[Effects of the Invention] According to the present invention, since the floating tube is made to rise and fall according to the tide level, the buoyancy of the floating tube can be adjusted to move the top end of the floating tube up and down in accordance with the vertical movement of seawater. It is also possible to arrange steel pipe piles that appear to be permanently submerged in seawater. Therefore, the wave-dissipating structure can be constructed without changing the natural landscape in any way. Therefore, on coastlines like the Enshu Sea facing the open ocean, where swimming is dangerous due to tidal currents and wave heights,
It is possible to develop a recreation zone where sea bathing is possible.

If swimming, etc. is suspended only during abnormal times such as typhoons, there is no need to take into account the maximum height of waves to be controlled, and it is economical because there is no need to design with excessive wave loads. be.

In addition, the coast, which was previously unusable due to waves, will now be able to be used more widely, such as by making it possible to set up an intermediate nursery for seedlings for cultivation and fishing.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing one example of the structure of a pile used in the present invention, and FIG. 2 is a schematic sectional view showing another example of the structure of a pile used in the present invention. 1: steel pipe, 2: submarine ground, 3: hole through which seawater passes,
4: Float pipe, 4A: Space (float), 5: Weight, 6:
Stopper, 7: Locking part.

Claims (1)

[Claims] 1 In a method of controlling waves, etc. by driving a plurality of steel pipes into the seabed and arranging them, a floating pipe is provided above the steel pipe that can be moved up and down a predetermined distance inside or outside the steel pipe, and the floating pipe is moved according to the tide level. A method for controlling waves, etc., characterized by causing them to rise and fall.