JPS61233111A - Caisson breakwater - Google Patents
Caisson breakwaterInfo
- Publication number
- JPS61233111A JPS61233111A JP7268085A JP7268085A JPS61233111A JP S61233111 A JPS61233111 A JP S61233111A JP 7268085 A JP7268085 A JP 7268085A JP 7268085 A JP7268085 A JP 7268085A JP S61233111 A JPS61233111 A JP S61233111A
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- front leg
- leg
- seat plate
- vertical
- 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.)
- Granted
Links
Landscapes
- Revetment (AREA)
Abstract
Description
【発明の詳細な説明】 （Ｍ業上の分野） 本発明はケーソン防波堤の改良に関する。[Detailed description of the invention] (M business field) The present invention relates to improvements in caisson breakwaters.
（従来技術の問題点）
従来、一般に用いられていたケーソン防波堤は、第三図
図示のような中空の立方体のものの内部に、中詰として
栗石、土砂が使われているものであつ喪。この構成のケ
ーソンには、波を受けると、ケーソン底面と栗石の間の
間＠全通じて波の圧力の伝達が行なわれて揚圧力か発生
する。津波のように周期の長い波では、第四図図示のよ
うに、この揚圧力が長方形の分布形に近いものとなり、
ケーソン防波堤に於て通常の設計に用いらｎている三角
形分布（第五図番■）とは異ってくる。このため、ケー
ソンは前面の壁に作用する波圧と、この揚圧力によって
転倒または「づれ」と云う危険な事態が起ると云う問題
点がめった。(Problems with the prior art) The caisson breakwater that has been commonly used in the past is a hollow cube as shown in Figure 3, with chestnut stone and earth and sand used as filler. When a caisson with this configuration receives waves, wave pressure is transmitted throughout the space between the bottom of the caisson and the rock, generating uplift pressure. In waves with long periods such as tsunamis, this uplift force has a nearly rectangular distribution shape, as shown in Figure 4.
This is different from the triangular distribution (Figure 5, No. ■) that is normally used in the design of caisson breakwaters. For this reason, the caissons often faced the problem of overturning or ``slipping'' due to the wave pressure acting on the front wall and the uplift force.
（本発明の目的）
本発明位、従来のケーソン防波堤の前記欠点を解決する
のに最も遥切なものｔ得んとすること金目的とする。(Object of the present invention) The object of the present invention is to obtain the most significant solution to the above-mentioned drawbacks of the conventional caisson breakwater.
（問題点を解決するための手段）
第−図１のように、ケーソン防波堤の底部に作用する揚
圧力の減少のためにケーソンに前脚αＧを設は且つ訳前
脚の前端部には垂直縦隔壁（１７を突設し、以て波によ
る水粒子の移動をケーソン下面へ伝達するのを防ぐと共
に、該前脚（１１１の処よ月０込んでいた圧力波をよ下
方向の水の出入の埃象に陽き換えるための水抜き孔（３
）をケーソン座面板（５ンの前脚近接個崩に設け、以て
該水抜き孔（３）より後方に於けるケーソン下面に作用
する揚圧力１−＊少させたのである。(Means for solving the problem) As shown in Figure 1, a front leg αG is installed on the caisson in order to reduce the uplift force acting on the bottom of the caisson breakwater, and a vertical bulkhead is installed at the front end of the front leg. (17 is installed protrudingly to prevent the movement of water particles caused by waves from being transmitted to the lower surface of the caisson. Drainage hole for changing the sun to the elephant (3
) was installed on the caisson seat plate (5 inches) near the front leg, thereby reducing the uplift force acting on the lower surface of the caisson behind the drain hole (3) by 1-*.
（作 用）
本発明に於ては、ケーソン圧面−＼の揚圧力を減少させ
るためにケーソンに前脚−ヲ設け、且つ前脚部の前端に
垂直な縦隔壁（１）ｔつけ、波による水粒子の移動をケ
ーソンの下面へ伝達するのを防ぐようにしたのでおるが
、このことは波動の伝造距離七長（すると共に、圧力の
伝達がｍｔａｔ縦隔壁（１）の処で曲るようにして行わ
れることによる圧力の伝達損失を生じせしめ、揚圧力の
減少’に＊したのである。之と共に、前脚（１１）の水
平部分（４）の個所は、波圧による下向きの力を受ける
ことになり、ケーソン全転倒させようとする波圧のモー
メントと逆のモーメントが起ることになって、ケーソン
の安定化に役立つのである。(Function) In the present invention, in order to reduce the uplift force on the caisson pressure surface, the caisson is provided with a front leg, and a vertical bulkhead (1) is attached to the front end of the front leg to prevent water particles caused by waves. This is to prevent the transmission of the wave movement to the lower surface of the caisson. This caused a loss in pressure transmission, resulting in a decrease in uplift force.At the same time, the horizontal portion (4) of the nose landing gear (11) was subjected to downward force due to wave pressure. This creates a moment opposite to the moment of wave pressure that would cause the caisson to topple over, which helps stabilize the caisson.
更に、前述の通り、水抜き孔（３）ｒｃ、前脚αυの処
たら廻り込んできた圧力波を、丞抜き孔（３）ｔ−通じ
た水の出入の現象におきかえることにより、この水抜き
孔（３）より後方のケーソン座面板（５〕に作用する揚
圧力ｔ−Ｍ少させるものでるる。Furthermore, as mentioned above, by replacing the pressure waves that have entered the water drain hole (3) rc and the front leg αυ with the phenomenon of water flowing in and out through the water drain hole (3) t, this water drain can be reduced. This reduces the lift force t-M acting on the caisson seat plate (5) rearward of the hole (3).
第六図は、本発明に於ける前記の波圧の作用の説明図、
第七図乃至県九図はケーソン下面にか＼る揚圧力の説明
図である。FIG. 6 is an explanatory diagram of the effect of the wave pressure in the present invention,
Figures 7 to 9 are explanatory diagrams of the uplift force exerted on the lower surface of the caisson.
第六図に於て、ＡＢはケーソン下面を示し、前脚Ｑｌの
存在によりＡに近い個７９１に前脚ａｔ押えようとする
波圧がか−っていることか囚示さｎる。In FIG. 6, AB indicates the lower surface of the caisson, and it can be seen that due to the presence of the front leg Ql, the wave pressure trying to suppress the front leg is applied to the part 791 near A.
第七図は、従来の第三図■示の如きケーソンの下面にか
−る揚圧力を示したものである。FIG. 7 shows the uplift force exerted on the lower surface of the conventional caisson as shown in FIG.
第八図は、前脚部垂直縦隔壁（１）をつけて水抜き孔（
３）を設けない場合のケーソンの下面にか＼る揚圧力を
示したものである。Figure 8 shows the vertical bulkhead (1) attached to the front leg and the drainage hole (
3) shows the uplift force on the lower surface of the caisson when it is not installed.
第九図は、水抜き孔（３）を設は且つ前脚部垂直縦隔壁
（１）を設けた本発明の場合のケーソンの下面にか＼る
揚圧力１示したものである。FIG. 9 shows the uplift force 1 exerted on the lower surface of the caisson in the case of the present invention, which is provided with a drain hole (3) and a vertical longitudinal bulkhead (1) in the front leg.
（！ｉ！施例）
第−乃至二一は本発明の実施例を示したものである。ケ
ーソン防波堤の全高〔１扛ケ一ソン下面の全長（ソと略
々等しい長さで
Ｈ＝Ｌ＝約Ｓ〜１０米
第−図図示のように、ケーソン座面板（５）、前脚部水
平ｆｆ１１（４）及び前脚部垂直縦隔壁（１）韮にケー
ソン下面の補強用横隔壁（２）にて囲まれた部分に鉱栗
石ｔ″詰めるのである。この栗石は、石とし、後方部の
方はｔｏ−２ｏ＠径程匿の比較的大径の栗石とするのが
好ましい。このように栗石ｔｇめるときは、波による圧
力の伝達を拡散させると云う効果かめる。(!i!Example) Nos.- to 21 show examples of the present invention. The total height of the caisson breakwater [1] The total length of the lower surface of the caisson (approximately equal to the length H = L = approximately S ~ 10 meters - As shown in the diagram, the caisson seat plate (5), front leg horizontal ff11 (4) and the vertical vertical bulkhead of the front leg (1), the area surrounded by the reinforcing horizontal bulkhead (2) on the lower surface of the caisson is filled with quartzite. It is preferable to use a relatively large-diameter chestnut stone with a to-2o diameter.When the chestnut stone is cut in this way, the effect of diffusing the transmission of pressure due to waves can be seen.
この効果を、丈に著しいものにするために前記ケーソン
座面板（５）の、前記水抜き孔（３）のめる個庖よりも
少許後方に水平方向の水流通孔（刀のある隔壁板（６）
を突設することが更に好ましい。これにより水抜き孔（
３）による前述の「よ万へ圧力を抜いてしまう」と云９
作用を更に大きくできる。災際には、この水流通孔（７
）のめる隔壁板（６）の個所よりも後方に、前記の１０
−２０１ｉｌ！径程度の比較的大径の栗石を詰めるよう
にする。之によりケーソンへの圧力の減少上針るのであ
る。図中、（８）は後脚であってケーソンの安定化に役
立つものである。In order to make this effect more noticeable in length, there is a horizontal water flow hole (partition plate (6) with a sword) in the caisson seat plate (5) a little rearward than the hole in which the water drain hole (3) is inserted. )
It is more preferable to protrude. This allows the water drain hole (
3) The above-mentioned ``I will release the pressure to Yoman'' 9
The effect can be further increased. In the event of a disaster, this water distribution hole (7
) The above-mentioned 10
-201il! Fill it with relatively large-diameter chestnut stone. This reduces the pressure on the caisson. In the figure, (8) is a rear leg that helps stabilize the caisson.
この後脚（８）は、ケーソン座面板（５）から之と同一
水平面上に所要長延在させて成るものである。This rear leg (8) extends a required length from the caisson seat plate (5) on the same horizontal plane.
（発明の効果） 以上述べてきたように、本発明によれば。(Effect of the invention) As described above, according to the present invention.
比較的に簡単な４１１！成で極めて竪牢なケーソン防波
堤上経済的に得ることができると云う大き７！時長がめ
る。411 is relatively easy! A large 7 that can be obtained economically on a very vertical caisson breakwater! It's long time.
第一図は本発明に係るケーソン防波堤の実施例ｔ−示し
た一部切欠の断面俳面図、第二図は同上のＸ−Ｘ＠断面
平面図。
第三■は従来のケーソンの側面図、
第四図は陶土のケーソンに於ての津波のような長周期波
の及ぼす揚圧力の説明図。
第五図は従来のケーソンの設計のときに使用される揚圧
力の説明図。
第六図は波圧に関する説明図。
第七−乃至第九図は揚圧力に関する説明図、第十図は第
一図における隔壁板（６）などの正面図、
（υは前脚部縦隔壁
（２）はケーソン下面の補強用横隔壁
（３）は水抜き孔
（４１Ｉａ、前脚部水平部
（５）はケーソン座面板
（６）は隔壁板
（７）は水流通孔 ・
（８）は後脚
α呻は前脚
籍許出膳人 荻 ａｉｌＩＩ３
（発 明 名 ）
代理人 ９Ｐ理士 暑 見 敏
手続補正書印発）
昭和６０年５月１６日
特許庁長官 志 賀 学 殿
１、事件の表示
昭和６０年特許願第７２１，８０号
荻 原 国 宏
４、代理人
５、補正命令の日付
昭和 年 月 日
６、補正の対象
適正な図面
７、補正の内容
別紙の通りFig. 1 is a partially cutaway sectional view showing an embodiment of the caisson breakwater according to the present invention, and Fig. 2 is a sectional plan view taken along line X-X of the same. Figure 3 is a side view of a conventional caisson, and Figure 4 is an explanatory diagram of the uplift force exerted by long-period waves such as a tsunami on a china clay caisson. Figure 5 is an explanatory diagram of the uplift force used when designing a conventional caisson. Figure 6 is an explanatory diagram regarding wave pressure. Figures 7 to 9 are explanatory diagrams regarding uplift force, Figure 10 is a front view of the bulkhead plate (6), etc. in Figure 1, (υ is the vertical bulkhead of the front leg (2) is the horizontal bulkhead for reinforcing the lower surface of the caisson. (3) is a water drain hole (41Ia), the horizontal part of the front leg (5) is the caisson seat plate (6), and the bulkhead plate (7) is the water flow hole; Ogi ail II3 (Invention name) Agent 9P Physician Satoshi Natsumi Procedural amendment signed) May 16, 1985 Director General of the Patent Office Manabu Shiga 1, Indication of the case 1985 Patent Application No. 721,80 Ogi Kunihiro Hara 4, Agent 5, Date of amendment order: Showa, month, day 6, Appropriate drawing to be amended 7, Contents of amendment as attached.
Claims (3)
ためにケーソンに前脚を設け且つ該前脚の前端部には垂
直縦隔壁を突設すると共に、該前脚の処より廻り込んで
きた圧力波を上下方向の水の出入の現象に置き換えるた
めの水抜き孔をケーソン座面板の前脚近接個所に設けた
ことを特徴とするケーソン装置(1) In order to reduce the uplift force acting on the bottom of the caisson breakwater, a front leg is provided on the caisson, and a vertical vertical bulkhead is protruded from the front end of the front leg, and the pressure wave that comes around from the front leg is A caisson device characterized in that a water drain hole is provided at a location near the front leg of the caisson seat plate to replace the phenomenon of water inflow and outflow in the vertical direction.
て、ケーソン座面板、前脚部水平部及び前脚部垂直縦隔
壁並にケーソン下面の補強用横隔壁にて囲まれた部分に
詰める栗石は、前脚部の方は３〜７糎径程度の比較的小
径の栗石とし、後方部の方は１０〜２０糎径程度の比較
的大径の栗石となしたことを特徴とするケーソン装置(2) In the caisson device according to claim 1, the area surrounded by the caisson seat plate, the horizontal part of the front leg, the vertical vertical bulkhead of the front leg, and the reinforcing horizontal bulkhead on the lower surface of the caisson is stuffed. A caisson device characterized in that the front leg part has a relatively small diameter chestnut stone of about 3 to 7 diameters, and the rear part has a relatively large diameter chestnut stone of about 10 to 20 diameters.
て、前記ケーソン座面板の、前記水抜き孔のある個所よ
りも少許後方に水平方向の水流通孔のある隔壁板を突設
したことを特徴とするケーソン装置(3) In the caisson device according to claim 1, a partition plate having a horizontal water flow hole is provided protruding from the caisson seat plate a little further back than the location where the water drain hole is located. A caisson device characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7268085A JPS61233111A (en) | 1985-04-08 | 1985-04-08 | Caisson breakwater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7268085A JPS61233111A (en) | 1985-04-08 | 1985-04-08 | Caisson breakwater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61233111A true JPS61233111A (en) | 1986-10-17 |
| JPH0410921B2 JPH0410921B2 (en) | 1992-02-26 |
Family
ID=13496327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7268085A Granted JPS61233111A (en) | 1985-04-08 | 1985-04-08 | Caisson breakwater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61233111A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003082635A (en) * | 2001-09-12 | 2003-03-19 | Taisei Corp | Gravity structure |
| JP2009114689A (en) * | 2007-11-05 | 2009-05-28 | Kobe Steel Ltd | Construction method for revetment structure |
| JP2013029012A (en) * | 2011-11-22 | 2013-02-07 | Penta Ocean Construction Co Ltd | Caisson foundation stand for restoring caisson type breakwater and restoration method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935423U (en) * | 1982-08-27 | 1984-03-05 | 三菱重工業株式会社 | Water-stopping structure at the bottom of underwater structures |
-
1985
- 1985-04-08 JP JP7268085A patent/JPS61233111A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935423U (en) * | 1982-08-27 | 1984-03-05 | 三菱重工業株式会社 | Water-stopping structure at the bottom of underwater structures |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003082635A (en) * | 2001-09-12 | 2003-03-19 | Taisei Corp | Gravity structure |
| JP2009114689A (en) * | 2007-11-05 | 2009-05-28 | Kobe Steel Ltd | Construction method for revetment structure |
| JP2013029012A (en) * | 2011-11-22 | 2013-02-07 | Penta Ocean Construction Co Ltd | Caisson foundation stand for restoring caisson type breakwater and restoration method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0410921B2 (en) | 1992-02-26 |
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