JPH042124B2 - - Google Patents
Info
- Publication number
- JPH042124B2 JPH042124B2 JP4156686A JP4156686A JPH042124B2 JP H042124 B2 JPH042124 B2 JP H042124B2 JP 4156686 A JP4156686 A JP 4156686A JP 4156686 A JP4156686 A JP 4156686A JP H042124 B2 JPH042124 B2 JP H042124B2
- Authority
- JP
- Japan
- Prior art keywords
- fixed wall
- floating body
- reflectance
- waves
- incident
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Revetment (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、港湾等に設置される、反射率の低
い防波堤に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a breakwater with low reflectance installed in a harbor or the like.
港湾等に設置される防波堤は、従来、入射して
くる波をそのまま単純にはね返すように構成され
ている。このため、防波堤に当つた波の反射波
と、防波堤への入射波とが重合して、水面変動が
大になる問題が生じていた。
BACKGROUND ART Breakwaters installed in ports and harbors have conventionally been constructed to simply reflect incoming waves as they are. For this reason, the reflected waves of the waves hitting the breakwater and the waves incident on the breakwater overlap, resulting in a problem of large water surface fluctuations.
近年、港湾における諸機能の拡張や整備が進め
られて港湾内における自然海浜が消失しつつあ
る。この結果、港湾内のほぼ四方から反射波が生
ずるようになつてきたため、従来の防波堤では、
港湾内の水域を静穏に保持させることができず。
船舶の航行や係留に悪影響が生ずるようになつて
きた。 In recent years, natural beaches within ports are disappearing due to the expansion and development of various functions at ports. As a result, reflected waves are now generated from almost all directions within the port, so conventional breakwaters
The waters within the port could not be kept calm.
This has begun to have a negative impact on ship navigation and mooring.
このため、波の反射率（反射波高／入射波高）
の小さい防波堤の開発が要望されており、これに
関する研究が種々なされ、既に各種の低反射率の
防波堤が提案されている。しかしながら、今まで
に提案されている低反射率の防波堤は、周期の短
い入射波に対しては有効に機能するものの、周期
の長い入射波になると反射率が大きくなり、所期
の機能が発揮されない問題があつた。 Therefore, the wave reflectance (reflected wave height/incident wave height)
There is a demand for the development of breakwaters with a small reflectance, and various studies have been conducted in this regard, and various breakwaters with low reflectivity have already been proposed. However, although the breakwaters with low reflectivity that have been proposed so far function effectively against incident waves with a short period, their reflectance increases when the incident waves have a long period, and the desired function cannot be achieved. I had a problem that didn't work.
従つて、この発明の目的は、周期の短い入射波
に対しても、また、周期の長い入射波に対して
も、効率的に波の反射率を低減することができ、
港湾内を静穏に保持することのできる防波堤を提
供することにある。
Therefore, an object of the present invention is to be able to efficiently reduce wave reflectance for both short-cycle and long-cycle incident waves;
The objective is to provide a breakwater that can keep the inside of a harbor calm.
この発明は、水域に設置された固定壁の前方
に、波の入射方向に向け、前記固定壁から所定間
隔をあけて浮体を配置し、前記固定壁と前記浮体
とを、複数本の連結体により連結し、前記連結体
と前記固定壁および前記浮体とを、各々水平の軸
により上下方向に回動自在に軸着したことに特徴
を有するものである。
In this invention, a floating body is arranged in front of a fixed wall installed in a body of water at a predetermined distance from the fixed wall in the direction of incidence of waves, and the fixed wall and the floating body are connected to each other by a plurality of connected bodies. The connecting body, the fixed wall, and the floating body are each connected by a horizontal axis so as to be rotatable in the vertical direction.
〔発明の構成〕
次に、この発明を図面を参照しながら説明す
る。第１図は、この発明の一実施態様を示す概略
正面図である。図面に示すように、水域に水底１
から築造された固定壁２の前方には、矢印に示す
ように入射する波３の入射方向に向け、固定壁２
から所定間隔Ａをあけて、固定壁２とほぼ平行
に、前記間隔Ａと同じ長さの幅Ｂを有する所定長
さの浮体５が配置されている。浮体５は、水面４
上に浮ぶポンツーン形状のものその他例えば特公
昭59−646号公報に示されるような特殊形状のも
の等を適宜使用する。[Structure of the Invention] Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view showing one embodiment of the present invention. As shown in the drawing, there is a water bottom 1 in the water area.
In front of the fixed wall 2 constructed from
A floating body 5 of a predetermined length and having a width B equal to the distance A is arranged substantially parallel to the fixed wall 2 at a predetermined distance A from the fixed wall 2. The floating body 5 is on the water surface 4
A pontoon-shaped one floating on the top or a special-shaped one as shown in Japanese Patent Publication No. 59-646 may be used as appropriate.
固定壁２と浮体５とは、両者間に所定間隔Ａが
保たれるような複数本の棒状の剛性を有する連結
体６によつて連結されている。固定壁２と複数本
の連結体６の各々の一端とは、水平の軸７によつ
て上下方向に回動自在に軸着され、浮体５と複数
本の連結体６の各々の他端とは、水平の軸８によ
つて上下方向に回動自在に軸着されている。 The fixed wall 2 and the floating body 5 are connected by a plurality of rod-shaped rigid connecting bodies 6 such that a predetermined distance A is maintained between them. One end of each of the fixed wall 2 and the plurality of connecting bodies 6 is rotatably fixed in the vertical direction by a horizontal shaft 7, and the other end of each of the floating body 5 and the plurality of connecting bodies 6 is is rotatably mounted on a horizontal shaft 8 in the vertical direction.
従つて、浮体５は、入射波３の波高に従つて上
下動するが、同時に浮体５を固定壁２に取り付け
る連結体６の両端の軸７および８を中心とする、
連結体６および浮体５の上下回動によつて、浮体
５の動揺には位相差が生ずる。この結果、動揺に
よつて発生する波と入射波とは互いに干渉しあう
ので、水面４を静穏な状態にすることができる。 Therefore, the floating body 5 moves up and down according to the wave height of the incident wave 3, but at the same time about the axes 7 and 8 at both ends of the coupling body 6 that attaches the floating body 5 to the fixed wall 2.
The vertical movement of the connecting body 6 and the floating body 5 causes a phase difference in the motion of the floating body 5. As a result, the waves generated by the agitation and the incident waves interfere with each other, making it possible to keep the water surface 4 in a calm state.
上述したように、この発明によれば、浮体５は
入射波３に対して位相差を有して動揺するので、
反射率（反射波高／入射波高）を効果的に低減す
ることができる。 As described above, according to the present invention, the floating body 5 oscillates with a phase difference with respect to the incident wave 3.
The reflectance (reflected wave height/incident wave height) can be effectively reduced.
第２図は、この発明による反射率の特性を示す
グラフである。図面において、縦軸は反射率KT
を示し、横軸は（浮体の幅Ｂ／入射波の波長Ｌ）
を示す。図面からわかるように、この発明によれ
ば、入射波３の波長Ｌ即ち入射波３の周期が長く
なつても、反射率KTは大きくならず、反射率KT
を効果的に低減することができる。 FIG. 2 is a graph showing reflectance characteristics according to the present invention. In the drawing, the vertical axis is the reflectance K T
, and the horizontal axis is (width B of floating body/wavelength L of incident wave)
shows. As can be seen from the drawings, according to the present invention, even if the wavelength L of the incident wave 3, that is, the period of the incident wave 3 becomes longer, the reflectance K T does not increase, and the reflectance K T
can be effectively reduced.
以上述べたように、この発明によれば、港湾等
に設置される防波堤において、周期の短い入射波
に対しても、また、周期の長い入射波に対して
も、効果的に波の反射率を低減することができ、
固定壁２に対し連結体６から伝達される力は、固
定壁２に対する接続点である軸７の一点に集中す
るので、設計を合理的に行なうことができ、既設
の防波堤に対しても適用が可能である等、多くの
優れた効果がもたらされる。
As described above, according to the present invention, in a breakwater installed in a port, etc., the wave reflectance can be effectively reduced for both short-cycle incident waves and long-cycle incident waves. can be reduced,
Since the force transmitted from the connecting body 6 to the fixed wall 2 is concentrated at one point on the shaft 7, which is the connection point to the fixed wall 2, the design can be done rationally, and it can also be applied to existing breakwaters. Many excellent effects can be brought about, such as the possibility of
第１図はこの発明の防波堤一実施例態様を示す
概略正面図、第２図はこの発明の防波堤による反
射率の特性を示すグラフである。図面において、
１…水底、２…固定壁、３…波、４…水面、５
…浮体、６…連結体、７，８…軸。
FIG. 1 is a schematic front view showing an embodiment of the breakwater of the present invention, and FIG. 2 is a graph showing the reflectance characteristics of the breakwater of the present invention. In the drawing, 1...water bottom, 2...fixed wall, 3...wave, 4...water surface, 5
...Floating body, 6... Connecting body, 7, 8... Axis.
Claims (1)
方向に向け、前記固定壁から所定間隔をあけて浮
体を配置し、前記固定壁と前記浮体とを、複数本
の連結体により連結し、前記連結体と前記固定壁
および前記浮体とを、各々水平の軸により上下方
向に回動自在に軸着したことを特徴とする防波
堤。1. A floating body is placed in front of a fixed wall installed in a body of water at a predetermined distance from the fixed wall in the direction of wave incidence, and the fixed wall and the floating body are connected by a plurality of connecting bodies. A breakwater, characterized in that the connecting body, the fixed wall, and the floating body are each pivotably attached to a horizontal shaft so as to be freely rotatable in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4156686A JPS62202105A (en) | 1986-02-28 | 1986-02-28 | breakwater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4156686A JPS62202105A (en) | 1986-02-28 | 1986-02-28 | breakwater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62202105A JPS62202105A (en) | 1987-09-05 |
| JPH042124B2 true JPH042124B2 (en) | 1992-01-16 |
Family
ID=12611993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4156686A Granted JPS62202105A (en) | 1986-02-28 | 1986-02-28 | breakwater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62202105A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7100317B2 (en) * | 2018-06-14 | 2022-07-13 | 国立大学法人九州大学 | Overpass suppression device |
-
1986
- 1986-02-28 JP JP4156686A patent/JPS62202105A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62202105A (en) | 1987-09-05 |
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