JPS6028966B2 - Wave breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wave-dampening paddle that uses two transparent bodies to provide an effective wave-dampening effect on waves with a wide range of periods.

In general, it is necessary to maintain calm inside a port to avoid problems with ship navigation.

In this case, wave-dissipating levees using upright wave-dissipating structures are particularly desired today in order to improve the quality of ports, such as the effective use of space within the harbor and the conservation of water quality. Some wave-dissipating paddles of this type utilize upright transparent bodies.

This method utilizes the fact that when a wave passes through a transparent body, the energy of the wave is attenuated before and after the passage, thereby increasing the wave-dissipating effect. The issue here is the wave dissipation method using such an upright transparent body. By the way, considering that actual waves are irregular waves with various periods, it is necessary to obtain an effective wave-dissipating effect for waves with a wide period.

In this regard, conventional devices of this type have the disadvantage that because the wave period range in which they can exert an effective wave-dissipating effect is narrow, they cannot adequately respond to actual incoming waves and cannot keep the inside of the port sufficiently calm. there were. This invention was made in consideration of the above points, and is based on the premise of improving the quality of ports, such as effective use of port space and water quality conservation. exerts an effective wave-dissipating effect,
The purpose is to provide a wave dissipation system that can keep the harbor sufficiently calm. First, to describe the characteristics of this invention, in this invention, two upright arm-shaped transmitting bodies are constructed in front of the rear wall under predetermined conditions, thereby synergistically producing treetop waves. It is characterized by this point. below,
The contents of the present invention will be explained in detail with reference to the drawings.

Before describing the content of this invention, I would like to introduce the underlying technology and clarify the gist of this invention by comparing it with it.

Prerequisite technology A wave-dissipating system that uses one transparent body and one retarding section.

As shown in Fig. 1, an upright arm-shaped transparent body T is placed facing forward in the direction of wave incidence (arrow direction in the figure), and an upright impedance is placed behind it at a predetermined distance. A transparent rear wall W is arranged.

Therefore, behind the transparent body T, a water retarding portion U with a length of 100 mm is formed. When waves enter from the front of the transparent body T as shown by the arrow, a difference occurs between the water level in front of the transparent body T and the water level in the water retarding section U, and as a result, seawater flows inside the transparent body T.

This transparent body T' is provided with a permeation hole A of a predetermined size, and when seawater passes through this permeation hole A, it is forced to suddenly contract or expand rapidly, and a vortex is generated at this time. This causes the energy of the waves to be attenuated.In addition to the approaching waves, the return waves reflected on the rear wall W are also attenuated in the same way, or cancel each other out with the approaching waves. The effect depends on the porosity of the transparent body T (area ratio occupied by the transparent hole A portion when viewed from the front), the width b of the transparent body T (the length of the transparent hole A), and the size of the water retarding part U (length). S) That becomes an important factor.

For example, if t b is 8% of the installation water depth h, the porosity of the transmitting body T = 0.1 to 0.3 and the ratio (b + 〆)/L of the overall width of the wave-dissipating channel to the wavelength L, FIG. 2 shows how the wave reflectance KR changes.

In order to normally be considered calm, it is desirable that the reflectance KR is 0.3 or less, and considering this point and looking at Figure 2, we find that ko=0.2, and (b+evening)/L;0. 18-0.19
It can be seen that in the case of , an effective wave-dampening effect is exhibited.

However, as is clear from this figure, the range of wavelengths that exhibit an effective wave extinction effect is narrow, and if the wavelength is shorter than the above value,
Even if it becomes longer (toward the right side of the vertical axis in the figure) or becomes longer (towards the left side of the machine axis in the figure), the reflectance KR increases rapidly and the wave-dissipating effect decreases. Therefore, it can be seen that this is insufficient to deal with waves of a wide range of wavelengths that actually attack. Contents of this invention A wave-dissipating system using two transparent bodies and two retarding parts.

In the wave dissipation method of this invention, as shown in FIG.
With its front facing in the direction of wave incidence (the direction of the arrow in the figure), there is a first transparent body T, with a predetermined distance 2 behind it, a second transparent body T2, and a 2 predetermined distance 2 behind it. Three non-transparent rear walls W are arranged in parallel.

Therefore, behind the first permeable body T, there is formed a first water retarding part U with a length length, and behind the second permeable body T2, a second water retarding part U2 with a length length 2 is formed. When waves are incident on these front surfaces, the energy of the waves is attenuated at two locations, the first and second transmitters T, L.

The principle of wave dissipation is the same as in the case of the above-mentioned [base technology].
Therefore, the wave-dissipating effect includes the porosity of the first and second transmitting bodies T, , T2, the width of the first and second transmitting bodies T, , L (the width of the transmitting hole A and the transmitting hole length of A2) q, Q, size of first and second water retarding parts U,, U2 (
The length) is an important factor, and it is necessary to select these values appropriately. In an actual example, at the installation water depth h, q = 0.08 to 0.1, and wide ≧ Qt (q + evening,
)/(Q〆2)=〇. 75 ~ 1.0.

・2～〇・4・So2 =〇.・~0.2,go,>go2
It was found that the maximum wave-dissipating effect can be obtained if each value is determined to satisfy the following relationship. Some examples are shown in FIG. 4 for reference. This is the case where b,=Q=0.0 orbit ~ ,=0.3 2 =0.1, and (b
Reflectance KR using Tobata, ) no (Q Toso 2) as a parameter
This is what is shown. However, the horizontal axis is the total width of the wave-dissipating wave ×=
b, Tobata, 10Q Tobata 2 and the ratio of wavelength L x/L. Comparing this Figure 4 with the above-mentioned Figure 2, it is clear that ×/L is large, that is, the wavelength is shortened. The range will be quite wide. On the other hand, for waves with a small X/L, that is, a long wavelength, (b+〆.)/(b2Toyu2)=0.75
If it is selected to be ~1.0, the range of wavelengths in which KR is 0.3 or less becomes slightly larger. As a practical matter, in a port with an inland sea atmosphere, there are not many waves with long wavelengths, and even if it were necessary to deal with it, it can be seen that it can be covered by increasing the value of X. In other words, what can be seen from Fig. 4 is that even if the value of x is small, that is, the width of the wave-dissipating groove is decreased by 4, there is a sufficiently effective wave-dissipating effect for waves with a fairly wide range of wavelengths. It means that you can get it.

Therefore, it becomes possible to effectively utilize the port space without taking up the space of the Enami Green. The gist of the present invention has been explained above, and the specific content thereof will be further described below. [Specific contents of this invention] [
See Figures 3 and 5] The two transparent bodies T,, T2
are upright wall-like structures, each constructed on a foundation C.

In that case, a caisson-type structure made of one-piece concrete may be fine, but since it will be used in areas where wave force is relatively weak, such as ports, a block structure is better because turning can be done easily. The first and second transmitting bodies T, L are constructed by stacking the first transmitting block B and the second transmitting block B2, respectively.This stacking method, as shown in FIG. When viewed from the front, they are arranged in a houndstooth check pattern, with the transparent holes A and B corresponding to each other.The transparent holes A and B may be provided in the block B itself, or if the blocks B are stacked one on top of the other. Sometimes the blocks B may be formed between adjacent blocks, and in the case shown in Fig. 5, the transparent holes A are provided to serve as both blocks. As a result, the transmission holes A, are uniformly distributed on the wall surface of the transmission body T, and the wave energy attenuation effect by the transmission body T is uniformly performed over the entire surface. Compared to the case where they are stacked in a grid pattern, the reflectance KR does not change much even if the wave height of the incident wave changes.In addition to obtaining these advantages, it is also advantageous in terms of structural strength. (The same applies to the transmission hole.) In this way, by constructing each part at a predetermined distance, the wave-dissipating frame is constructed.

Next, the most preferred example of the wave-dissipating bank according to the present invention will be described. This wave-dissipating bank is constructed by stacking wave-dissipating blocks 1 shown in FIGS. 6 to 8 in the form of an upright wall.

In other words, this wave-dissipating block 1 includes the first transmission block B, the second transmission block B2, and the rear wall block B3 formed by blocking the non-transmission rear wall W.
, B2, B3, Nagasaso, and Tsunagimura 2, 3 of Yu 2
It is connected and integrated. In this case, it goes without saying that the blocks B, , B2, and B3 correspond to each other in the horizontal direction. Each part of the wave-dissipating block 1 has a structure made up of horizontal and vertical flat plates, and can also be constructed by connecting flat panels. In this way, the elements constituting the first transmitting body T, the second transmitting body L, and the non-transmissive rear wall W (each block ear, B2, B3) are attached to the wave-dissipating block 1 itself.
In addition to incorporating , the placement relationship is also set, so
The desired wave-dissipating structure can be easily constructed by simply stacking the wave-dissipating blocks 1.

In addition, the parts indicated as T,, U,, T2, U2, and W in FIGS. 6 to 8 are the first transparent body T, the first water retarding part U, and These are the parts that constitute the second permeable body T2, the second water retarding part U2, and the impermeable rear wall W, respectively.
As explained above, according to the present invention, waves are dissipated by arranging two upright wall-shaped transmitting bodies under predetermined conditions, so that waves with a wide range of periods that actually attack can be dissipated. It has an effective wave-dissipating effect against water, and can keep the inside of the harbor sufficiently calm.

In addition, the wave-dissipating structure to achieve this can be an upright structure with a narrow width, so it has the effect of effectively utilizing the port space and improving the quality of the port, such as preserving water quality. play. Brief explanation of the drawings - Figure 1 shows the technology on which this invention is made, namely 1.
A cross-sectional view to explain the details of the wave-dissipating method using two transparent bodies and one water retarding section, Fig. 2 is a characteristic diagram showing the wave-dissipating effect of the method, and Fig. 3 shows the wave-dissipating principle of this invention. 4 is a characteristic diagram showing the wave-dissipating effect according to the present invention, FIG. 5 is a front view as seen from the front side where the waves of FIG. 3 are incident, and FIG. 6 is the wave-dissipating effect according to the present invention. FIG. 7 is a perspective view of a wave-dissipating block for constructing a wave-dissipating block, FIG. 7 is a plan view thereof, and FIG. 8 is a side view thereof.

T. ...First transparent body, T2...Second transparent body, U
．． ...G...first water retarding part, U2...second water retarding part, W...impermeable rear wall, B,...first permeable block, B2...second permeable Block "B3... Rear block, C... Foundation, 1... Wave-dissipating block, 2,3... Connecting material.

Figure 1 Figure 2 Figure 3 Figure 5 Figure 7 Figure 8 Figure 4 Figure 6

Claims (1)

[Claims] 1. With the front surface facing the wave incident direction, the porosity ε_1,
Upright wall-shaped first transparent body T_1 having a transparent hole length b_1
is constructed by stacking blocks, and a predetermined distance l_
A second transparent body T_2 having a porosity ε_2 and a transparent body width b_2 is constructed by stacking blocks in the same way as the first transparent body T_1, and an upright opaque body T_2 is spaced apart by a predetermined distance l_2 behind the first transparent body T_1. Build a wall W and set these as l_1=0.2~0.4, ε_2=0.1~0.2
, ε_1>ε_2, b_1≧b_2, (b_1+l_1
)/(b_2+l_2)=0.75 to 1.0, in which the non-transparent rear wall W is made to correspond to the first and second transparent bodies T_1 and T_2. In addition to building a block stacked structure, these three
Two blocks B_1, B_2, B_3 are connected by connecting members 2, 3 having predetermined lengths l_1 and l_2 to form an integral wave-dissipating block 1, and this integral wave-dissipating block 1 is stacked in the form of an upright wall. A wave-dissipating device characterized by a built-in structure. 2. The wave-dissipating block 1 according to claim 1, wherein each part of the wave-dissipating block 1 has a structure in which horizontal and vertical flat plates are combined. 3 The first and second transmitting bodies T_1 and T_2 are respectively a first transmitting block B_1 and a second transmitting block B_2.
, and the first transparent block B_
2. The wave-dissipating structure according to claim 1, wherein the first and second transmission blocks B_2 are stacked in a houndstooth pattern that corresponds to each other when viewed from the front.