JP3697091B2

JP3697091B2 - Floating body sway reduction device

Info

Publication number: JP3697091B2
Application number: JP32801998A
Authority: JP
Inventors: 亮西垣; 洋一山口; 正己松浦
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1998-11-18
Filing date: 1998-11-18
Publication date: 2005-09-21
Anticipated expiration: 2018-11-18
Also published as: JP2000142569A

Description

【０００１】
【発明の属する技術分野】
この発明は、水上に浮かぶ浮桟橋、浮倉庫、作業船、浮駐車場等の浮体構造物（以下、浮桟橋等という）浮体が入射波によって動揺するのを低減する浮体の動揺低減装置に関する。
【０００２】
【従来の技術】
図１４は浮桟橋等の浮体の動揺低減装置として提案されたものの一例である。図１４に示すように、浮体ｅの波上側及び波下側に水面下張出部材ｇを固設し、この水面下張出部材ｇに波方向に対して直角方向に離間して複数個の減揺浮体ｈを配置した。これら減揺浮体ｈは、水面下張出部材ｇにヒンジｉを介して回動自在に取付け、減揺浮体ｈが入射波を受けると、ヒンジｉを支点として揺動して吸収し、浮体ｅに伝わる入射波を減衰するようになっている。
【０００３】
【発明が解決しようとする課題】
しかしながら、浮体ｅだけのものと、浮体ｅに設けた水面下張出部材ｇにヒンジｉを介して減揺浮体ｈを設けたものとの浮体ｅが受けるロール振幅を実験によって求めたところ、両者に差異がほとんどなく、波周期によっては、減揺浮体ｈを設けたものの方がロール振幅が大きくなるという問題があり、減揺浮体ｈを設けても入射波を減衰できないことが判った。
【０００４】
この発明は、前記事情に着目してなされたもので、その目的とするところは、浮体に設けた簡単な構造の部材によって効率良く消波でき、使用範囲の波周期において動揺を低減できる浮体の動揺低減装置を提供することにある。
【０００５】
【課題を解決するための手段】
この発明は、前記目的を達成するために、請求項１は、水上に浮かぶ浮体本体の少なくとも波上側の側部下端に、該浮体本体の底面より下方に延びる鉛直板を、前記浮体本体と通水可能な間隔を存して固設したことを特徴とする浮体の動揺低減装置にある。
【０００６】
請求項２は、請求項１の前記鉛直板を上下動可能に設けたことを特徴とする。
【０００７】
【発明の実施の形態】
以下、この発明の各実施の形態を図面に基づいて説明する。
【０００８】
図１は第１の実施形態を示し、（ａ）は浮桟橋等の浮体１の側面図、（ｂ）は（ａ）の矢印Ｂ−Ｂ方向から見た図である。浮体１は、例えば鋼板によって直方体形状に構成し、内部には密閉された複数の浮き室（図示しない）が設けられている。そして、浮き室が発生する浮力によって浮体１は水上に浮かんでいる。なお、２は浮体１の喫水線を示し、３は波の方向を示す。
【０００９】
浮体１の波上側１ａ及び波下側１ｂには水面下張出部材４ａ，４ｂが固設されている。この水面下張出部材４ａ，４ｂの先端上面には波方向に回動自在なヒンジ５を介して減揺浮体６が取付けられている。
【００１０】
減揺浮体６は中空箱体形状で、ヒンジ５を支点として波方向に傾斜しても浮力によって垂直方向に戻るようになっている。さらに、減揺浮体６の外側には水面を貫通する鉛直板７が固設されている。なお、本実施形態においては、減揺浮体６及び鉛直板７が浮体１の全幅に亘って設けられているが、浮体１の幅方向（紙面に直角方向）に複数個に分割し、所定間隔を存して配置してもよい。
【００１１】
前述のように構成された鉛直板７を有する減揺浮体６を備えた浮体１によれば、水上に浮かした状態で、波上側から入射波が鉛直板７に加わると、鉛直板７と一体に減揺浮体６がヒンジ５を支点として矢印方向に傾き、減揺浮体６の浮力による復原力が入射波の力に勝ると、減揺浮体６はヒンジ５を支点として矢印と反対方向に戻り、この繰り返しによって浮体１の入射波の影響を低減できる。
【００１２】
図２は第１の実施形態の変形例１であり、浮体１の波上側１ａだけに水面下張出部材４ａを設け、この水面下張出部材４ａにヒンジ５を介して鉛直板７を有する減揺浮体６を設けたものであり、作用は第１の実施形態と同様である。
【００１３】
図３は第１の実施形態の変形例２であり、浮体１の波下側１ｂだけに水面下張出部材４ｂを設け、この水面下張出部材４ｂにヒンジ５を介して鉛直板７を有する減揺浮体６を設けたものであり、作用は第１の実施形態と同様である。
【００１４】
図４は第２の実施形態を示し、第１の実施形態と同一構成部分は同一番号を付して説明を省略する。本実施形態は、浮体１の上端部と減揺浮体６の上端部との間をコイルバネ等の弾性部材８によって連結し、浮体１と減揺浮体６の動揺の固有周期を略等しくしたものである。なお、減揺浮体６の内部に水またはウエイトを設置し、浮力を調整して固有周期を略等しくしてもよい。
【００１５】
図５は第３の実施形態を示し、第１の実施形態と同一構成部分は同一番号を付して説明を省略する。本実施形態は、浮体１の波上側１ａだけに水面を貫通して浮体１の底面１ｃより下方に延びる鉛直板７を固設したものである。
【００１６】
前述のように構成された鉛直板７を浮体１の波上側１ａに固設し、浮体１を水上に浮かした状態で、波上側から入射波が鉛直板７に加わると、鉛直板７が入射波による浮体１の回転運動（ローリング）を抑制するため、浮体１の入射波の影響を低減できる。
【００１７】
図６は第４の実施形態を示し、第１の実施形態と同一構成部分は同一番号を付して説明を省略する。本実施形態は、浮体１の波上側１ａ及び波下側１ｂの底面１ｃに下方に延びる鉛直板９ａ，９ｂを上下動可能に設けたものである。鉛直板９ａ，９ｂはヒンジ１０を介して浮体１の底面１ｃに波方向に回動可能であり、ヒンジ１０には鉛直板９ａ，９ｂを水平または垂下状態でロックできるロック機構（図示しない）が設けられている。
【００１８】
従って、矢印Ｂ方向が波上側の場合には鉛直板９ａをヒンジ１０を支点として回動して垂下し、鉛直板９ｂをヒンジ１０を支点として回動して水平に倒すことができ、矢印Ｃ方向が波上側の場合には、逆に鉛直板９ｂを垂下し、鉛直板９ａを水平に倒すことができ、第４の実施形態と同様の作用がある。
【００１９】
図７は第４の実施形態の変形例を示し、浮体１の波上側１ａ及び波下側１ｂの側面１ｄに浮体１の底面１ｃより下方に延びる鉛直板１１ａ，１１ｂを上下動可能に設けたものである。浮体１の側面１ｃには上下方向にガイドレール１２が設けられ、このガイドレール１２には鉛直板１１ａ，１１ｂが上下方向にスライド自在に設けられている。鉛直板１１ａ，１１ｂにはストッパピン１３が突設され、ガイドレール１２の端部１４に当接してストロークが規制されるようになっている。
【００２０】
従って、矢印Ｂ方向が波上側の場合には鉛直板１１ａを下方にスライドして浮体１の底面１ｃより下方に垂下し、鉛直板１１ｂを上方にスライドして浮体１の側面１ｄに格納することができ、矢印Ｃ方向が波上側の場合には、逆に鉛直板１１ｂを垂下し、鉛直板１１ａを格納することができ、第５の実施形態と同様の作用がある。
【００２１】
図８は第５の実施形態を示し、第１の実施形態と同一構成部分は同一番号を付して説明を省略する。本実施形態は、浮体１の甲板１ｅに波上側１ａ及び波下側１ｂに、減揺浮体６及び鉛直板７の上方まで延出する延長甲板１５が設けられている。この延長甲板１５の先端部には減揺浮体６及び鉛直板７の可動範囲の外側で、しかも水面を貫通して鉛直板７の下端近傍まで延長する通水可能な部材１７が垂下して設けられている。
【００２２】
通水可能な部材１７は、網状部材、多孔板、スリット板、格子部材または適当な間隔に設けた長尺部材であり、入射波は通水可能な部材１７を通過するときに破砕され、波浪エネルギが減衰され、減揺浮体６及び鉛直板７を浮体１の入射波の影響を低減できる。また、延長甲板１５により甲板面積を広くでき、部材１７に船舶等が接岸できる。
【００２３】
図９（ａ）（ｂ）は第６の実施形態を示し、第１の実施形態と同一構成部分は同一番号を付して説明を省略する。本実施形態は、浮体１の波上側１ａ及び波下側１ｂの底面１ｃに間隔１８ａ，１８ｂを存して下方に延びる鉛直板１９ａ，１９ｂを固設したものである。すなわち、浮体１の底面１ｃ両側部には下方に延びる適当間隔の支持部材２０が設けられ、この一対の支持部材２０に鉛直板１９ａ，１９ｂが固定されている。
【００２４】
これにより図５と同様に浮体１の動揺が抑制される。なお、間隔の作用であるが、この隙間がないと、水は浮体底面と隙間のない板との間に閉じ込められ、あたかも単純な箱型浮体のように減揺効果のないものとなるが、隙間があると水が通過するのでそのような逆効果は防止される。
【００２５】
図１０（ａ）（ｂ）は第６の実施形態の変形例を示し、浮体１の波上側１ａ及び波下側１ｂに波上側及び波下側に水面下で水平に延びる支持部材２１を適当間隔で設け、この支持部材２１に浮体１の底面１ｃより下方に延びる鉛直板２２ａ，２２ｂを固設し、浮体１と鉛直板２２ａ，２２ｂとの間に間隔２３ａ，２３ｂを設けたものである。
【００２６】
これにより図５と同様に浮体１の動揺が抑制される。なお、間隔の作用であるが、この隙間がないと、水は浮体底面と隙間のない板との間に閉じ込められ、あたかも単純な箱型浮体のように減揺効果のないものとなるが、隙間があると水が通過するのでそのような逆効果は防止される。
【００２７】
なお、第２〜第６の実施形態においても、第１の実施形態に述べたことと同様に減揺浮体及び鉛直板または鉛直板を浮体の幅方向（紙面と直角方向）に複数個に分割し、所定間隔を存して配置してもよい。このように構成することにより、浮体の斜め方向からの入射波に対しても効果的である。
【００２８】
次に、模型浮体を用いた実験結果について説明する。図１１は浮体１にヒンジ付減揺浮体を取付けた実験である。横軸が波周期（sec）であり、縦軸が浮体のRoll振幅／波振幅（deg/m）である。Ａ曲線は、浮体１だけであり、Ｂ曲線は、浮体１の波上側にヒンジ５を介して減揺浮体６を取付け、この減揺浮体６に鉛直板７を取付けた図２に相当するものであり、Ｃ曲線は、浮体１の波上側及び波下側にヒンジ５を介して減揺浮体６を取付け、この減揺浮体６に鉛直板７を取付けた図１に相当するものである。
【００２９】
この実験結果によれば、減揺浮体６に鉛直板７を取付けた図２に相当するもの、及び浮体１の波上側及び波下側に鉛直板７を有した減揺浮体６を取付けた図１に相当ものは、Ｂ，Ｃ曲線で示すように、波周期の広い範囲、特に通常の浮桟橋における波周期４〜６秒の範囲で入射波を減衰させ、浮体１のロール振幅を低減できることが分かった。
【００３０】
次に、図１２は浮体１に鉛直板７を固設した実験である。横軸が波周期（sec）であり、縦軸が浮体のRoll振幅／波振幅（deg/m）である。Ａ曲線は、浮体１だけであり、Ｄ曲線は、浮体１の波上側に鉛直板７を固設した図５に相当するものである。
【００３１】
この実験結果によれば、浮体１の波上側に鉛直板７を取付けたものは、Ｄ曲線で示すように、入射波を減衰させ、浮体１のロール振幅を低減できることが分かった。
【００３２】
次に、図１３は浮体１にヒンジ付減揺浮体を取付け、浮体１の上下方向の振幅（Heave振幅）を測定した実験である。横軸が波周期（sec）であり、縦軸が浮体のHeave振幅／波振幅（m/m）である。ａ曲線は、浮体１だけであり、ｂ曲線は、浮体１の波上側及び波下側にヒンジ５を介して減揺浮体６を取付け、両減揺浮体６に鉛直板７を取付けた図１に相当するものである。
【００３３】
この実験結果によれば、浮体１の波上側及び波下側に鉛直板７を有した減揺浮体６を取付けた図１に相当するものは、波周期が４〜６secで入射波を減衰させ、浮体１のHeave振幅を低減できることが分かった。
【００３４】
【発明の効果】
以上説明したように、請求項１によれば、浮体本体の少なくとも波上側の側部下端に、該浮体本体の底面より下方に延びる鉛直板を、前記浮体本体と通水可能な間隔を存して固設したことを特徴とする。
従って、波上側から入射波が鉛直板に加わると、鉛直板が入射波による浮体本体のローリングを抑制するため、浮体本体の入射波の影響を低減でき、簡単な構造で、浮体本体の揺れを低減できるという効果がある。
さらに、鉛直板と浮体本体との間に通水可能な間隔を設けることにより、入射波が間隔をくぐり抜け、その波高が徐々に減衰され、浮体が受ける影響を低減できるという効果がある。つまり、前記間隔がないと、水は浮体底面と間隔のない板との間に閉じ込められ、あたかも単純な箱型浮体のように減揺効果のないものとなるが、間隔があると水が通過するのでそのような逆効果は防止される。
請求項２によれば、鉛直板を上下動可能に設けたことにより、浮体が受ける波の方向に対して鉛直板の位置を切替えることができるという効果がある。
【図面の簡単な説明】
【図１】この発明の第１の実施形態を示し、（ａ）は浮体の動揺低減装置の側面図、（ｂ）は（ａ）の矢印Ｂ−Ｂ方向から見た図。
【図２】同実施形態の変形例１を示す浮体の動揺低減装置の側面図。
【図３】同実施形態の変形例２を示す浮体の動揺低減装置の側面図。
【図４】この発明の第２の実施形態を示す浮体の動揺低減装置の側面図。
【図５】この発明の第３の実施形態を示す浮体の動揺低減装置の側面図。
【図６】この発明の第４の実施形態を示す浮体の動揺低減装置の側面図。
【図７】同実施形態の変形例を示す浮体の動揺低減装置の側面図。
【図８】この発明の第５の実施形態を示す浮体の動揺低減装置の側面図。
【図９】この発明の第６の実施形態を示し、（ａ）は浮体の動揺低減装置の側面図、（ｂ）は（ａ）の矢印Ｄ方向から見た図。
【図１０】同実施形態の変形例を示し、（ａ）は浮体の動揺低減装置の側面図、（ｂ）は（ａ）の矢印Ｅ方向から見た図。
【図１１】ヒンジ付減揺浮体を備えた浮体のRoll振幅の実験例を示す図。
【図１２】鉛直板を備えた浮体のRoll振幅の実験例を示す図。
【図１３】ヒンジ付減揺浮体を備えた浮体のHeave振幅を測定した実験例を示す図。
【図１４】従来の減揺浮体を備えた浮体を示し、（ａ）は側面図、（ｂ）は（ａ）の矢印Ｆ方向から見た図。
【符号の説明】
１…浮体
４a，４ｂ…水面下張出部材
６…減揺浮体
７…鉛直板
１８ａ、１８ｂ…間隔
１９…鉛直板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floating body sway reduction device for reducing floating body structures (hereinafter referred to as floating pier bridges) such as floating piers, floating warehouses, work boats, and floating parking lots floating on water from being shaken by incident waves.
[0002]
[Prior art]
FIG. 14 is an example of what was proposed as an apparatus for reducing the shaking of a floating body such as a floating pier. As shown in FIG. 14 , a water surface projecting member g is fixed on the wave upper side and wave lower side of the floating body e, and a plurality of the water surface lower projecting members g are separated from each other in a direction perpendicular to the wave direction. An anti-vibration floating body h is arranged. These anti-vibration floating bodies h are rotatably attached to the underwater overhanging member g via hinges i. When the anti-vibration floating bodies h receive an incident wave, they are oscillated and absorbed with the hinge i as a fulcrum. The incident wave transmitted to is attenuated.
[0003]
[Problems to be solved by the invention]
However, when the amplitude of the roll received by the floating body e of the floating body e alone and the underwater overhanging member g provided on the floating body e through the hinge i is determined by experiment, There was a problem that depending on the wave period, there was a problem that the roll amplitude was larger in the case where the reduced floating body h was provided, and it was found that the incident wave could not be attenuated even if the reduced floating body h was provided.
[0004]
The present invention has been made paying attention to the above circumstances, and the object of the present invention is to provide a floating body that can be efficiently wave-dissipated by a member having a simple structure provided on the floating body and can reduce fluctuations in the wave period of the use range. It is to provide a vibration reduction device.
[0005]
[Means for Solving the Problems]
The present invention, in order to achieve the above object, according to claim 1, at least the waves upper side the lower end of the floating body floating on water, the vertical plate extending downward from the bottom surface of the該浮body, said floating body and passing The present invention is a floating body sway reduction device characterized in that it is fixed with a space allowing water .
[0006]
A second aspect is characterized in that the vertical plate according to the first aspect is provided so as to be movable up and down .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
1A and 1B show a first embodiment, in which FIG. 1A is a side view of a floating body 1 such as a floating bridge, and FIG. 1B is a view seen from the direction of arrows BB in FIG. The floating body 1 is formed in a rectangular parallelepiped shape with, for example, a steel plate, and a plurality of sealed floating chambers (not shown) are provided inside. And the floating body 1 floats on the water by the buoyancy which a floating chamber generate | occur | produces. In addition, 2 shows the water line of the floating body 1, and 3 shows the direction of a wave.
[0009]
On the wave upper side 1 a and the wave lower side 1 b of the floating body 1, underwater overhang members 4 a and 4 b are fixed. An anti-vibration floating body 6 is attached to the upper surface of the distal end of each of the underwater projecting members 4a and 4b via a hinge 5 that is rotatable in the wave direction.
[0010]
The anti-vibration floating body 6 has a hollow box shape, and returns to the vertical direction by buoyancy even if it tilts in the wave direction with the hinge 5 as a fulcrum. Further, a vertical plate 7 penetrating the water surface is fixed outside the anti-sway floating body 6. In the present embodiment, the anti-vibration floating body 6 and the vertical plate 7 are provided over the entire width of the floating body 1, but are divided into a plurality of parts in the width direction of the floating body 1 (perpendicular to the plane of the drawing). May be arranged.
[0011]
According to the floating body 1 provided with the anti-vibration floating body 6 having the vertical plate 7 configured as described above, when an incident wave is applied to the vertical plate 7 from the wave upper side in a state of floating on the water, it is integrated with the vertical plate 7. When the anti-swaying floating body 6 tilts in the direction of the arrow with the hinge 5 as a fulcrum and the restoring force due to the buoyancy of the anti-swaying floating body 6 surpasses the force of the incident wave, the anti-swaying floating body 6 returns to the direction opposite to the arrow with the hinge 5 as the fulcrum. By repeating this, the influence of the incident wave of the floating body 1 can be reduced.
[0012]
FIG. 2 shows a first modification of the first embodiment, in which a water surface projecting member 4 a is provided only on the wave-side 1 a of the floating body 1, and the water surface projecting member 4 a has a vertical plate 7 via a hinge 5. An anti-sway floating body 6 is provided, and the operation is the same as that of the first embodiment.
[0013]
FIG. 3 shows a second modification of the first embodiment, in which a water surface projecting member 4 b is provided only on the wave lower side 1 b of the floating body 1, and a vertical plate 7 is attached to the water surface projecting member 4 b via a hinge 5. The anti-vibration floating body 6 which has is provided, and an effect | action is the same as that of 1st Embodiment.
[0014]
FIG. 4 shows a second embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, the upper end of the floating body 1 and the upper end of the anti-swaying floating body 6 are connected by an elastic member 8 such as a coil spring, and the natural periods of the oscillations of the floating body 1 and the anti-swaying floating body 6 are substantially equal. is there. In addition, water or a weight may be installed inside the anti-sway floating body 6 and the buoyancy may be adjusted to make the natural period substantially equal.
[0015]
FIG. 5 shows a third embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, a vertical plate 7 that penetrates the water surface and extends downward from the bottom surface 1 c of the floating body 1 is fixedly provided only on the wave-side 1 a of the floating body 1.
[0016]
When the vertical plate 7 configured as described above is fixed to the wave upper side 1a of the floating body 1 and the floating body 1 is floated on the water, when the incident wave is applied to the vertical plate 7 from the wave upper side, the vertical plate 7 is incident. Since the rotational movement (rolling) of the floating body 1 due to the wave is suppressed, the influence of the incident wave of the floating body 1 can be reduced.
[0017]
FIG. 6 shows a fourth embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, vertical plates 9a and 9b extending downward are provided on the wave upper side 1a of the floating body 1 and the bottom surface 1c of the wave lower side 1b so as to be movable up and down. The vertical plates 9a and 9b can be rotated in a wave direction to the bottom surface 1c of the floating body 1 via the hinge 10, and the hinge 10 has a lock mechanism (not shown) that can lock the vertical plates 9a and 9b in a horizontal or hanging state. Is provided.
[0018]
Therefore, when the arrow B direction is the wave upper side, the vertical plate 9a can be pivoted about the hinge 10 and suspended, and the vertical plate 9b can be pivoted about the hinge 10 to fall horizontally. When the direction is the wave-side, the vertical plate 9b can be hung down and the vertical plate 9a can be tilted horizontally, which has the same effect as in the fourth embodiment.
[0019]
FIG. 7 shows a modification of the fourth embodiment. Vertical plates 11a and 11b extending below the bottom surface 1c of the floating body 1 are provided on the side surface 1d of the wave upper side 1a and the wave lower side 1b of the floating body 1 so as to be movable up and down. Is. A guide rail 12 is provided in the vertical direction on the side surface 1c of the floating body 1, and vertical plates 11a and 11b are provided on the guide rail 12 so as to be slidable in the vertical direction. A stopper pin 13 protrudes from the vertical plates 11a and 11b and comes into contact with the end portion 14 of the guide rail 12 so that the stroke is regulated.
[0020]
Therefore, when the direction of arrow B is on the wavefront side, the vertical plate 11a is slid downward to hang downward from the bottom surface 1c of the floating body 1, and the vertical plate 11b is slid upward and stored in the side surface 1d of the floating body 1. When the arrow C direction is the wave upper side, the vertical plate 11b can be suspended and the vertical plate 11a can be retracted, which is the same as that of the fifth embodiment.
[0021]
FIG. 8 shows a fifth embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, the deck 1 e of the floating body 1 is provided with the extended deck 15 that extends to above the anti-vibration floating body 6 and the vertical plate 7 on the wave upper side 1 a and the wave lower side 1 b. A water-permeable member 17 that extends outside the movable range of the anti-sway floating body 6 and the vertical plate 7 and extends through the water surface to the vicinity of the lower end of the vertical plate 7 hangs down from the tip of the extension deck 15. It has been.
[0022]
The water-permeable member 17 is a net-like member, a perforated plate, a slit plate, a lattice member, or a long member provided at an appropriate interval. The incident wave is crushed when passing through the water-permeable member 17, The energy is attenuated, and the influence of the incident wave of the floating body 1 can be reduced in the rocking floating body 6 and the vertical plate 7. In addition, the deck area can be increased by the extension deck 15, and a ship or the like can come into contact with the member 17.
[0023]
9A and 9B show a sixth embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, vertical plates 19a and 19b extending downward with spaces 18a and 18b are fixedly provided on the bottom surface 1c of the wave upper side 1a and the wave lower side 1b of the floating body 1. That is, support members 20 with appropriate intervals extending downward are provided on both sides of the bottom surface 1 c of the floating body 1, and the vertical plates 19 a and 19 b are fixed to the pair of support members 20.
[0024]
As a result, the swinging of the floating body 1 is suppressed as in FIG. Although it is the action of intervals, this is no gap, the water is trapped between the floating bottom and no gap plate, but becomes no swinging motion reducing effect as if it were a simple box-type floating body If there is a gap, such a reverse effect is prevented because water passes.
[0025]
Figure 10 (a) (b) shows a modification of the sixth embodiment, appropriate support members 21 extending horizontally under the surface waves upper 1a and wave lower 1b floating body 1 on the wave top and the wave bottom side Vertical plates 22a and 22b extending downward from the bottom surface 1c of the floating body 1 are fixed to the support member 21, and intervals 23a and 23b are provided between the floating body 1 and the vertical plates 22a and 22b. .
[0026]
As a result, the swinging of the floating body 1 is suppressed as in FIG. Although it is the action of intervals, this is no gap, the water is trapped between the floating bottom and no gap plate, but becomes no swinging motion reducing effect as if it were a simple box-type floating body If there is a gap, such a reverse effect is prevented because water passes.
[0027]
In the second to sixth embodiments as well, as described in the first embodiment, the anti-vibration floating body and the vertical plate or the vertical plate are divided into a plurality in the width direction of the floating body (perpendicular to the plane of the paper). However, they may be arranged with a predetermined interval. Such a configuration is also effective for incident waves from an oblique direction of the floating body.
[0028]
Next, experimental results using the model floating body will be described. FIG. 11 shows an experiment in which a swinging floating body with a hinge is attached to the floating body 1. The horizontal axis is the wave period (sec), and the vertical axis is the roll amplitude / wave amplitude (deg / m) of the floating body. The curve A corresponds only to the floating body 1, and the curve B corresponds to FIG. 2 in which the anti-vibration floating body 6 is attached to the wave upper side of the floating body 1 via the hinge 5 and the vertical plate 7 is attached to the anti-vibration floating body 6. The curve C corresponds to FIG. 1 in which the anti-vibration floating body 6 is attached to the wave upper side and wave lower side of the floating body 1 via the hinge 5 and the vertical plate 7 is attached to the anti-vibration floating body 6.
[0029]
According to this experimental result, a figure corresponding to FIG. 2 in which the vertical plate 7 is attached to the anti-vibration floating body 6, and a diagram in which the anti-vibration floating body 6 having the vertical plate 7 is attached to the wave upper side and wave lower side of the floating body 1. The equivalent of 1 can attenuate the roll amplitude of the floating body 1 by attenuating the incident wave over a wide range of wave periods, especially in the range of 4 to 6 seconds in the normal floating pier, as shown by the B and C curves. I understood.
[0030]
Next, FIG. 12 shows an experiment in which the vertical plate 7 is fixed to the floating body 1. The horizontal axis is the wave period (sec), and the vertical axis is the roll amplitude / wave amplitude (deg / m) of the floating body. The A curve is only the floating body 1, and the D curve corresponds to FIG. 5 in which the vertical plate 7 is fixed on the wave upper side of the floating body 1.
[0031]
According to this experimental result, it was found that the vertical plate 7 attached to the wave upper side of the floating body 1 can attenuate the incident wave and reduce the roll amplitude of the floating body 1 as indicated by the D curve.
[0032]
Next, FIG. 13 is an experiment in which a swinging floating body with hinges is attached to the floating body 1 and the vertical amplitude (Heave amplitude) of the floating body 1 is measured. The horizontal axis is the wave period (sec), and the vertical axis is the Heave amplitude / wave amplitude (m / m) of the floating body. The curve a is only the floating body 1, and the curve b is shown in FIG. 1 in which the anti-vibration floating body 6 is attached to the wave upper side and wave lower side of the floating body 1 via the hinge 5 and the vertical plate 7 is attached to both the anti-vibration floating bodies 6. It is equivalent to.
[0033]
According to this experimental result, the one corresponding to FIG. 1 in which the anti-vibration floating body 6 having the vertical plate 7 is attached on the wave upper side and wave lower side of the floating body 1 attenuates the incident wave with a wave period of 4 to 6 seconds. It was found that the Heave amplitude of the floating body 1 can be reduced.
[0034]
【The invention's effect】
As described above, according to the first aspect, the vertical plate extending below the bottom surface of the floating body is provided at least at the lower end of the wave-side side portion of the floating body so as to allow water to pass through the floating body. It is characterized by being fixed.
Therefore, when an incident wave is applied to the vertical plate from the wave upper side, the vertical plate suppresses rolling of the floating body due to the incident wave, so that the influence of the incident wave on the floating body can be reduced, and the floating body can be shaken with a simple structure. There is an effect that it can be reduced.
Furthermore, by providing a space that allows water to flow between the vertical plate and the floating body, the incident wave passes through the space, the wave height is gradually attenuated, and the effect of the floating body can be reduced. In other words, if there is no space, water is confined between the bottom surface of the floating body and a plate with no space, and there is no anti-vibration effect like a simple box-type floating body. Therefore, such an adverse effect is prevented.
According to claim 2, by providing the vertical plate so as to be movable up and down, there is an effect that the position of the vertical plate can be switched with respect to the direction of the wave received by the floating body.
[Brief description of the drawings]
1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a side view of a floating body sway reduction device, and FIG. 1B is a view seen from the direction of arrows BB in FIG.
FIG. 2 is a side view of a floating body sway reducing device showing a first modification of the embodiment.
FIG. 3 is a side view of a floating body sway reduction device showing a second modification of the embodiment;
FIG. 4 is a side view of a floating body sway reduction device showing a second embodiment of the present invention.
FIG. 5 is a side view of a floating body sway reduction device showing a third embodiment of the present invention.
FIG. 6 is a side view of a floating body sway reducing device showing a fourth embodiment of the present invention.
FIG. 7 is a side view of a floating body shaking reduction device showing a modification of the embodiment;
FIG. 8 is a side view of a floating body shaking reduction device showing a fifth embodiment of the present invention;
9A and 9B show a sixth embodiment of the present invention, in which FIG. 9A is a side view of a floating body sway reducing device, and FIG.
10A and 10B show a modification of the embodiment, in which FIG. 10A is a side view of a floating body sway reduction device, and FIG. 10B is a view seen from the direction of arrow E in FIG.
FIG. 11 is a diagram showing an experimental example of Roll amplitude of a floating body provided with a hinged rocking floating body.
FIG. 12 is a diagram showing an experimental example of Roll amplitude of a floating body provided with a vertical plate.
FIG. 13 is a diagram showing an experimental example in which the Heave amplitude of a floating body provided with a hinged rocking floating body was measured.
14A and 14B show a floating body having a conventional anti-sway floating body, where FIG. 14A is a side view, and FIG. 14B is a view as seen from the direction of arrow F in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Floating body 4a, 4b ... Water surface lowering member 6 ... Anti-vibration floating body 7 ... Vertical board 18a, 18b ... Space | interval 19 ... Vertical board

Claims

At least the waves upper side the lower end of the floating body floating on water, floating body, characterized in that a vertical plate extending downward from the bottom surface of the該浮body was fixed by presence of the floating body and passing water capable intervals Sway reduction device.

2. The floating body sway reduction device according to claim 1, wherein the vertical plate is provided so as to be movable up and down .