JP6901283B2 - Moored floating body sway reduction device and moored floating body - Google Patents

Moored floating body sway reduction device and moored floating body Download PDF

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JP6901283B2
JP6901283B2 JP2017040480A JP2017040480A JP6901283B2 JP 6901283 B2 JP6901283 B2 JP 6901283B2 JP 2017040480 A JP2017040480 A JP 2017040480A JP 2017040480 A JP2017040480 A JP 2017040480A JP 6901283 B2 JP6901283 B2 JP 6901283B2
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floating body
pulley group
resistance
mooring
sway
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織田　幸伸
幸伸 織田
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Taisei Corp
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Description

本発明は、水上に浮いた状態で係留される係留浮体の動揺低減装置及び係留浮体に関するものである。 The present invention relates to a device for reducing sway of a moored floating body and a moored floating body that are moored while floating on water.

海上や湖上などの水上に浮いた状態で係留される作業船や浮き桟橋は、波浪によって横揺れや縦揺れなどの動揺が生じるため、その動揺を低減させるための装置が開発されている。 Workboats and floating piers moored while floating on the water, such as on the sea or lake, are subject to sway such as rolling and pitching due to waves, and devices have been developed to reduce the sway.

例えば特許文献１では、係留索で係留される浮体構造物の下部に、平板状構造物を係留索と連結した連結部材を介して吊り下げることで、係留浮体構造物の横揺れや縦揺れによって平板状構造物が上下方向に移動するようにしている。 For example, in Patent Document 1, by suspending a flat plate-like structure from the lower part of a floating structure moored by a mooring rope via a connecting member connected to the mooring rope, the mooring floating structure is caused by rolling or pitching. The flat plate-like structure is designed to move in the vertical direction.

この平板状構造物が上下方向に移動する際に受ける鉛直方向の付加荷重や粘性減衰力による抵抗力は、浮体構造物の横揺れや縦揺れに対して作用することになり、動揺を低減させることができる。 The resistance force due to the vertical additional load and the viscous damping force received when the flat plate-shaped structure moves in the vertical direction acts on the rolling and pitching of the floating structure, and reduces the shaking. be able to.

特開２００６−１２３８４８号公報Japanese Unexamined Patent Publication No. 2006-1283848

しかしながら平板状構造物が上下方向に移動する際の流体抵抗力は速度の２乗に比例するため、浮体構造物の動揺周期が長くなる場合、平板状構造物の移動速度が小さく、動揺を低減するための充分な抵抗力を確保することができない。 However, since the fluid resistance force when the flat plate-shaped structure moves in the vertical direction is proportional to the square of the velocity, when the shaking period of the floating structure is long, the moving speed of the flat plate-shaped structure is small and the shaking is reduced. It is not possible to secure sufficient resistance to do so.

そこで、本発明は、長周期の動揺であっても充分に低減可能な係留浮体の動揺低減装置及び係留浮体を提供することを目的としている。 Therefore, an object of the present invention is to provide a sway reducing device for a moored floating body and a moored floating body that can sufficiently reduce even a long-period sway.

前記目的を達成するために、本発明の係留浮体の動揺低減装置は、水上に浮いた状態で係留される係留浮体の動揺低減装置であって、前記係留浮体の側方から水中に吊り下げられる抵抗部と、前記抵抗部に一端が接続される連結線材と、前記係留浮体の側方に取り付けられて前記抵抗部の上方で前記連結線材の方向を転換させる転換部と、前記転換部から離隔した位置の前記係留浮体の側方に取り付けられる定滑車群と、前記定滑車群の下方に配置される動滑車群と、前記動滑車群に接続されて水底に着底させる錘部とを備え、前記連結線材は、前記転換部で方向転換された後に前記定滑車群を通って前記動滑車群に架け渡され、前記定滑車群と前記動滑車群との間で複数回の架け渡しがされて前記定滑車群側又は前記動滑車群側に端部が接続されることを特徴とする。 In order to achieve the above object, the sway reducing device of the moored floating body of the present invention is a sway reducing device of the moored floating body moored while floating on water, and is suspended from the side of the moored floating body into water. A resistance portion, a connecting wire having one end connected to the resistance portion, a conversion portion attached to the side of the mooring float to change the direction of the connecting wire above the resistance portion, and a separation from the conversion portion. It is provided with a fixed pulley group attached to the side of the moored floating body at the position, a moving pulley group arranged below the fixed pulley group, and a weight portion connected to the moving pulley group and landed on the bottom of the water. After the direction is changed at the conversion portion, the connecting wire rod is bridged to the moving pulley group through the fixed pulley group, and is bridged a plurality of times between the fixed pulley group and the moving pulley group. The end portion is connected to the fixed pulley group side or the moving pulley group side.

ここで、前記抵抗部は、上端側より下端側の面積が小さい構成とすることができる。また、前記抵抗部は、上端側が平面で下端側が先細る曲面であることが好ましい。 Here, the resistance portion may have a configuration in which the area on the lower end side is smaller than that on the upper end side. Further, it is preferable that the resistance portion has a flat surface on the upper end side and a curved surface on the lower end side.

そして、係留浮体の発明は、上記いずれかに記載の係留浮体の動揺低減装置が、両側にそれぞれ取り付けられたことを特徴とする。 The invention of the mooring floating body is characterized in that the sway reducing devices of the mooring floating body according to any one of the above are attached to both sides, respectively.

このように構成された本発明の係留浮体の動揺低減装置及び係留浮体は、係留浮体から水中に吊り下げられる抵抗部と水底に着底させる錘部とを連結線材で繋ぐ際に、係留浮体の側方に取り付けられる定滑車群と動滑車群との間で複数回の架け渡しを行わせる。 The mooring float reducing device and the mooring floating body of the present invention configured in this way are of the mooring floating body when the resistance portion suspended from the mooring floating body and the weight portion landing on the water bottom are connected by a connecting wire. Make multiple bridges between the fixed pulley group and the moving pulley group attached to the side.

このため、抵抗部が上下方向に移動する速度による流体抵抗力が、定滑車群と動滑車群との間で連結線材を架け渡した回数に基づいて２乗倍、増加され、長周期の動揺であっても充分に低減させることができるようになる。 Therefore, the fluid resistance force due to the speed at which the resistance portion moves in the vertical direction is squared and increased based on the number of times the connecting wire is laid between the fixed pulley group and the moving pulley group, resulting in long-period shaking. Even if it is, it can be sufficiently reduced.

また、抵抗部を上端側より下端側の面積が小さい構成とすることで、抵抗部が上方に移動する際の抵抗を大きく、抵抗部が下方に移動する際の抵抗は小さくすることができる。このような抵抗部の形状は、半球状体のような上端側が平面で下端側が先細る曲面にすることで、容易に実現することができる。 Further, by configuring the resistance portion to have a smaller area on the lower end side than the upper end side, it is possible to increase the resistance when the resistance portion moves upward and decrease the resistance when the resistance portion moves downward. Such a shape of the resistance portion can be easily realized by forming a curved surface such as a hemispherical body in which the upper end side is flat and the lower end side is tapered.

本実施の形態の動揺低減装置が取り付けられた作業船の構成を説明する斜視図である。It is a perspective view explaining the structure of the work boat to which the sway reduction device of this embodiment is attached. 動揺低減装置の詳細な構成を説明する斜視図である。It is a perspective view explaining the detailed structure of the sway reduction apparatus. 動揺低減装置に作用する力と速度を示した説明図である。It is explanatory drawing which showed the force and speed acting on the sway reduction device. 動揺低減装置の収容方法を説明する斜視図である。It is a perspective view explaining the accommodating method of the sway reduction device.

以下、本発明の実施の形態について図面を参照して説明する。図１は、本実施の形態の動揺低減装置２が両側に取り付けられた係留浮体となる作業船１の構成を説明する斜視図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating a configuration of a work boat 1 serving as a mooring floating body to which the sway reducing device 2 of the present embodiment is attached to both sides.

この作業船１には、海洋工事で使用される大型クレーン船などの作業バージなどが該当する。また、水上に浮いた状態となる浮き桟橋などが係留浮体であってもよい。 The work boat 1 corresponds to a work barge such as a large crane vessel used in offshore construction. Further, a floating pier or the like that floats on the water may be a moored floating body.

図１では、作業船１を簡略的に長方形の板状で図示している。この作業船１は、水底Ｇから離隔した水面Ｗに浮いた状態で係留される。そして、長方形状の作業船１の両側の長辺の略中央に、それぞれ動揺低減装置２，２が対峙した状態で取り付けられる。 In FIG. 1, the work vessel 1 is simply shown in the shape of a rectangular plate. The work vessel 1 is moored while floating on the water surface W separated from the bottom G. Then, the sway reducing devices 2 and 2 are attached to each other in a state of facing each other at substantially the center of the long sides on both sides of the rectangular work boat 1.

本実施の形態の動揺低減装置２は、作業船１の側部１１から水中に吊り下げられる抵抗部３と、連結線材となる係留ワイヤ４と、係留ワイヤ４の方向を転換させる転換部としての回転体５と、作業船１の側部１１に取り付けられる定滑車群６と、定滑車群６の下方に配置される動滑車群７と、動滑車群７に接続されて水底Ｇに着底させる錘部８とによって、主に構成される。 The sway reduction device 2 of the present embodiment serves as a resistance portion 3 suspended from the side portion 11 of the work vessel 1 into water, a mooring wire 4 serving as a connecting wire, and a conversion portion for changing the direction of the mooring wire 4. The rotating body 5, the fixed pulley group 6 attached to the side portion 11 of the work vessel 1, the moving pulley group 7 arranged below the fixed pulley group 6, and the moving pulley group 7 are connected to the bottom G. It is mainly composed of a weight portion 8 to be made to be formed.

抵抗部３は、図２に示すように、水中を上下方向に移動した際に流体抵抗を発生させるもので、上端３１は抵抗を受けやすいように平面状に形成される。図２には、上端３１が円柱を切断した円形面で下端３２が半球状となる抵抗部３を示している。 As shown in FIG. 2, the resistance portion 3 generates fluid resistance when moving in the vertical direction in water, and the upper end 31 is formed in a flat shape so as to be susceptible to resistance. FIG. 2 shows a resistance portion 3 in which the upper end 31 is a circular surface obtained by cutting a cylinder and the lower end 32 is hemispherical.

抵抗部３の下端３２側を先細る曲面に形成することで、抵抗部３が下方向に移動した際に受ける流体抵抗を低減させることができる。すなわち、抵抗部３が下方向に移動する際の流体抵抗が大きすぎると、係留ワイヤ４の張力が非常に小さくなったり弛んだりして動揺低減装置２が機能しなくなるのを調整することができる。 By forming the lower end 32 side of the resistance portion 3 into a tapered curved surface, it is possible to reduce the fluid resistance received when the resistance portion 3 moves downward. That is, if the fluid resistance when the resistance portion 3 moves downward is too large, it is possible to adjust that the tension of the mooring wire 4 becomes very small or loosens and the sway reducing device 2 does not function. ..

この抵抗部３の上端３１には、係留ワイヤ４の一方の端部４１が接続される。そして、端部４１が抵抗部３に接続された係留ワイヤ４は、鉛直方向の上方に向けて延伸され、回転体５によって水平方向に方向転換される。 One end 41 of the mooring wire 4 is connected to the upper end 31 of the resistance portion 3. Then, the mooring wire 4 whose end portion 41 is connected to the resistance portion 3 is stretched upward in the vertical direction and is changed in the horizontal direction by the rotating body 5.

回転体５は、抵抗部３の上方で作業船１の側部１１に取り付けられて、係留ワイヤ４を円滑に鉛直方向から水平方向又は水平方向から鉛直方向に送り出すことができる構成となっている。そして、水平方向に向けられた係留ワイヤ４の水平部４２は、定滑車群６に向けて延伸される。 The rotating body 5 is attached to the side portion 11 of the work boat 1 above the resistance portion 3 so that the mooring wire 4 can be smoothly sent out from the vertical direction to the horizontal direction or from the horizontal direction to the vertical direction. .. Then, the horizontal portion 42 of the mooring wire 4 directed in the horizontal direction is extended toward the fixed pulley group 6.

定滑車群６は、作業船１の側部１１に沿って回転体５から離隔した位置に設置される。定滑車群６は、枠部６２の内空に複数の定滑車６１，・・・が配置されており、枠部６２を介して作業船１の側部１１に取り付けられる。 The fixed pulley group 6 is installed at a position separated from the rotating body 5 along the side portion 11 of the work boat 1. In the fixed pulley group 6, a plurality of fixed pulleys 61, ... Are arranged in the air inside the frame portion 62, and are attached to the side portion 11 of the work vessel 1 via the frame portion 62.

この定滑車群６の複数の定滑車６１，・・・は、すべて同じ回転軸６３を中心に回転する。すなわち複数の定滑車６１，・・・は、同軸で並列に配置される。そして、例えば一番、作業船１に近接した位置の定滑車６１に係留ワイヤ４の水平部４２が架けられて、鉛直方向に方向転換される。 The plurality of fixed pulleys 61, ... Of the fixed pulley group 6 all rotate around the same rotation shaft 63. That is, the plurality of fixed pulleys 61, ... Are arranged coaxially and in parallel. Then, for example, the horizontal portion 42 of the mooring wire 4 is hung on the fixed pulley 61 at the position closest to the work boat 1 and the direction is changed in the vertical direction.

一方、動滑車群７も、回転軸７３を回動支持させる枠部７２，７２間に、複数の動滑車７１，・・・が配置される。この動滑車群７の複数の動滑車７１，・・・は、すべて同じ回転軸７３を中心に回転する。すなわち複数の動滑車７１，・・・は、同軸で並列に配置される。 On the other hand, in the moving pulley group 7, a plurality of moving pulleys 71, ... Are arranged between the frame portions 72, 72 that rotationally support the rotating shaft 73. The plurality of moving pulleys 71, ... Of the moving pulley group 7 all rotate around the same rotation shaft 73. That is, the plurality of moving pulleys 71, ... Are arranged coaxially and in parallel.

動滑車群７の枠部７２，７２は、錘部８の上面８１に接続される。錘部８は、抵抗部３によって発生させる流体抵抗力によっても、水底Ｇから浮き上がらない重量を備えていればよい。 The frame portions 72, 72 of the moving pulley group 7 are connected to the upper surface 81 of the weight portion 8. The weight portion 8 may have a weight that does not rise from the bottom G even by the fluid resistance force generated by the resistance portion 3.

ここで、定滑車群６と動滑車群７との間で、複数回の架け渡しが行われる係留ワイヤ４の部分を、往復部４３と呼ぶこととする。往復部４３では、定滑車群６の最も作業船１の側部１１に近い位置の定滑車６１で方向転換された係留ワイヤ４が、真下に対峙する動滑車群７の動滑車７１に向けて延伸される。 Here, the portion of the mooring wire 4 in which the fixed pulley group 6 and the moving pulley group 7 are bridged a plurality of times is referred to as a reciprocating portion 43. In the reciprocating portion 43, the mooring wire 4 turned by the fixed pulley 61 located at the position closest to the side portion 11 of the work vessel 1 of the fixed pulley group 6 is directed toward the moving pulley 71 of the moving pulley group 7 facing directly below. It is stretched.

最初の動滑車７１で折り返された係留ワイヤ４は、２番目に側部１１に近い位置の定滑車６１で折り返され対峙する位置の動滑車７１に架け渡される。往復部４３では、このようにして定滑車群６と動滑車群７との間で、往復の架け渡しが繰り返される。 The mooring wire 4 folded back by the first moving pulley 71 is folded back by the fixed pulley 61 at the position second closest to the side portion 11 and bridged over the moving pulley 71 at the opposite position. In the reciprocating section 43, the reciprocating transfer is repeated between the fixed pulley group 6 and the moving pulley group 7 in this way.

そして、本実施の形態では、最終的に係留ワイヤ４の他方の端部４４を、定滑車群６の枠部６２の下面に設けられた接続部６４に接続する。なお、端部４４を錘部８の上面８１など動滑車群７側に接続する構成とすることもできる。 Then, in the present embodiment, finally, the other end 44 of the mooring wire 4 is connected to the connecting portion 64 provided on the lower surface of the frame portion 62 of the fixed pulley group 6. The end portion 44 may be connected to the moving pulley group 7 side such as the upper surface 81 of the weight portion 8.

次に、本実施の形態の動揺低減装置２及びそれが取り付けられた作業船１の作用について説明する。 Next, the operation of the sway reducing device 2 of the present embodiment and the work boat 1 to which the sway reducing device 2 is attached will be described.

本実施の形態の作業船１は、図１に示すように、船体の両側に対峙するように動揺低減装置２，２が取り付けられた状態で使用される。使用時には、錘部８，８の下面は水底Ｇに着底されている。 As shown in FIG. 1, the work boat 1 of the present embodiment is used in a state where the sway reducing devices 2 and 2 are attached so as to face each other on both sides of the hull. At the time of use, the lower surfaces of the weight portions 8 and 8 are landed on the bottom G of the water.

一方、係留ワイヤ４は、往復部４３及び水平部４２を含めて張った状態（張力のある状態）となっている。この状態で、例えば作業船１が波浪を受けて横揺れや縦揺れをし、作業船１の片側の側部１１が浮き上がると、動滑車群７が錘部８の重量で移動しないため、抵抗部３が上方に移動することになる。 On the other hand, the mooring wire 4 is in a stretched state (tensioned state) including the reciprocating portion 43 and the horizontal portion 42. In this state, for example, when the work vessel 1 receives waves and rolls or pitches, and the side portion 11 on one side of the work vessel 1 rises, the moving pulley group 7 does not move due to the weight of the weight portion 8, and thus resistance. The part 3 will move upward.

この状態を図で説明するのが図３である。ここでは、作業船１が速度ｖで上方に移動したと仮定している。そうすると、抵抗部３は、（ｎ+１）ｖの速度で上方に移動することになる。 This state is illustrated in FIG. Here, it is assumed that the work vessel 1 has moved upward at a speed v. Then, the resistance portion 3 moves upward at a speed of (n + 1) v.

また、係留ワイヤ４には、張力Ｔが発生している。このため、往復部４３では、ｎＴという下向きの力が発生している。ここで、ｎは、定滑車群６と動滑車群７との間で架け渡しが繰り返された回数を示している。例えば、定滑車６１から垂下された係留ワイヤ４が動滑車７１で折り返されて定滑車群６の位置まで戻るとｎ＝２となる。 Further, a tension T is generated in the mooring wire 4. Therefore, a downward force called nT is generated in the reciprocating portion 43. Here, n indicates the number of times that the bridge between the fixed pulley group 6 and the moving pulley group 7 is repeated. For example, when the mooring wire 4 hanging from the fixed pulley 61 is folded back by the moving pulley 71 and returned to the position of the fixed pulley group 6, n = 2.

係留ワイヤ４に張力Ｔが発生しているだけで、動揺低減装置２が取り付けられた作業船１の側部１１には、抵抗部３側と錘部８側とを合計した（ｎ+１）Ｔの力が作用する。 Only the tension T is generated in the mooring wire 4, and the resistance portion 3 side and the weight portion 8 side are totaled on the side portion 11 of the work vessel 1 to which the sway reduction device 2 is attached (n + 1). The force of T acts.

さらに、抵抗部３が上方に移動すると、上端３１の平面が受ける流体抵抗による力が作用することになる。ここで、上下方向に移動する面に作用する力は、速度の２乗に比例することが知られている。 Further, when the resistance portion 3 moves upward, a force due to the fluid resistance received by the flat surface of the upper end 31 acts. Here, it is known that the force acting on the surface moving in the vertical direction is proportional to the square of the velocity.

そこで、抵抗部３が係留ワイヤ４により直接作業船１の側部１１に取り付けられた場合（以下、「単純接続」と呼ぶ。）の抵抗力をＴ０とし、これとの比較により本実施の形態の動揺低減装置２による抵抗力の増加について説明する。 Therefore, when the resistance portion 3 is directly attached to the side portion 11 of the work vessel 1 by the mooring wire 4 (hereinafter, referred to as “simple connection”), the resistance force is set to T0, and the present embodiment is compared with this. The increase in resistance due to the shaking reducing device 2 will be described.

作業船１の側部１１が速度ｖで上昇すると、単純接続の場合、抵抗部３はｖの速度で上方に移動する。このとき、係留ワイヤ４に働く張力はＴ０＝αｖ２であり、抵抗力もＴ０となる。ここでαは、抵抗部３の形状によってきまる定数である。 When the side portion 11 of the work vessel 1 rises at a speed v, the resistance portion 3 moves upward at a speed v in the case of a simple connection. At this time, the tension acting on the mooring wire 4 is T0 = αv 2 , and the resistance force is also T0. Here, α is a constant determined by the shape of the resistance portion 3.

これに対し、本実施の形態の動揺低減装置２の場合、抵抗部３は（ｎ+１）ｖの速度で上方に移動することになるため、係留ワイヤ４に働く張力はＴ＝α（ｎ+１）２ｖ２、すなわちＴ＝（ｎ+１）２Ｔ０となり、ｎ＋１本の係留ワイヤ４により（ｎ+１）３Ｔ０の抵抗力が作業船１の側部１１に働くことになる。 On the other hand, in the case of the sway reducing device 2 of the present embodiment, the resistance portion 3 moves upward at a speed of (n + 1) v, so that the tension acting on the mooring wire 4 is T = α (n). +1) 2 v 2 , that is, T = (n + 1) 2 T0, and n + 1 mooring wires 4 exert a resistance force of (n + 1) 3 T0 on the side portion 11 of the work vessel 1.

このように抵抗部３の移動速度を増加させることができる構成であれば、作業船１の移動速度が小さくても、速度の２乗に比例して作用する力を利用して効率的に作業船１の動揺を低減させることが可能となる。 If the moving speed of the resistance portion 3 can be increased in this way, even if the moving speed of the work vessel 1 is small, the work can be performed efficiently by utilizing the force acting in proportion to the square of the speed. It is possible to reduce the sway of the ship 1.

係留中は作業船１の動揺の低減に使用される動揺低減装置２は、作業船１の航行時などには不要となる。その場合は、抵抗部３を作業船１上に引き上げて、係留ワイヤ４の端部４１を抵抗部３の上端３１から外し、図４に示すようにウインチ９に付け替える。 The sway reduction device 2 used to reduce the sway of the work vessel 1 while moored is not required when the work vessel 1 is sailing. In that case, the resistance portion 3 is pulled up onto the work vessel 1, the end portion 41 of the mooring wire 4 is removed from the upper end 31 of the resistance portion 3, and is replaced with a winch 9 as shown in FIG.

そして、ウインチ９を稼動させて係留ワイヤ４を巻き取ると、水底Ｇから錘部８が離陸して、作業船１の側部１１に近接した位置まで引き上げることが容易にできる。 Then, when the winch 9 is operated and the mooring wire 4 is wound up, the weight portion 8 takes off from the bottom G and can be easily pulled up to a position close to the side portion 11 of the work vessel 1.

このように構成された本実施の形態の作業船１の動揺低減装置２は、作業船１から水中に吊り下げられる抵抗部３と水底Ｇに着底させる錘部８とを係留ワイヤ４で繋ぐ際に、作業船１の側方に取り付けられる定滑車群６と動滑車群７との間で複数回ｎの架け渡しを行わせる。 The sway reduction device 2 of the work boat 1 of the present embodiment configured in this way connects the resistance portion 3 suspended from the work boat 1 into the water and the weight portion 8 landed on the bottom G by a mooring wire 4. At this time, the fixed pulley group 6 and the moving pulley group 7 attached to the side of the work vessel 1 are to be bridged a plurality of times.

このため、抵抗部３が上下方向に移動する速度（ｎ+１）ｖによる流体抵抗力が、定滑車群６と動滑車群７との間で係留ワイヤ４を架け渡した回数ｎに基づく（ｎ＋１）の２乗倍、増加され、長周期の動揺であっても充分に低減させることができるようになる。 Therefore, the fluid resistance force due to the speed (n + 1) v at which the resistance portion 3 moves in the vertical direction is based on the number of times n of the mooring wires 4 are laid between the fixed pulley group 6 and the moving pulley group 7 ( It is increased by the square of n + 1), and even long-period sway can be sufficiently reduced.

すなわち波浪によって作業船１に長周期の横揺れや縦揺れが起きる場合、単純接続では作業船１の側部１１の上下動の速度ｖが小さくなるので、抵抗部３が上下方向に移動する速度も小さくなる。 That is, when a long-period rolling or pitching occurs in the work vessel 1 due to waves, the speed v of the vertical movement of the side portion 11 of the work vessel 1 becomes small in the simple connection, so that the speed at which the resistance portion 3 moves in the vertical direction. Also becomes smaller.

これに対して、本実施の形態の動揺低減装置２であれば、往復部４３の係留ワイヤ４の本数をｎ本に増やすことで抵抗部３の速度を（ｎ+１）ｖに増加させる。この結果、（ｎ+１）３倍の力が作業船１の側方に作用することになって、長周期の横揺れや縦揺れなどの作業船１の動揺を効率的に低減させることができる。 On the other hand, in the sway reducing device 2 of the present embodiment, the speed of the resistance portion 3 is increased to (n + 1) v by increasing the number of mooring wires 4 of the reciprocating portion 43 to n. As a result, (n + 1) three times the force acts on the side of the work vessel 1, and it is possible to efficiently reduce the sway of the work vessel 1 such as long-period rolling and pitching. it can.

そして、動揺低減装置２によって作用させる流体抵抗力の大きさは、定滑車群６に配置する定滑車６１の数、及び動滑車群７に配置する動滑車７１の数を変更することで、容易に調整することができる。 The magnitude of the fluid resistance exerted by the sway reducing device 2 can be easily determined by changing the number of fixed pulleys 61 arranged in the fixed pulley group 6 and the number of moving pulleys 71 arranged in the moving pulley group 7. Can be adjusted to.

動揺低減装置２を両側に取り付けることによって作業船１の長周期の横揺れや縦揺れが低減できれば、揺れの影響で作業が中止になることが多い大型クレーン船などの稼働率を向上させることができる。 If the long-period rolling and pitching of the work vessel 1 can be reduced by attaching the sway reduction devices 2 on both sides, it is possible to improve the operating rate of large crane vessels, etc., whose work is often canceled due to the influence of the sway. it can.

また、抵抗部３を上端３１側より下端３２側の面積が小さい半球状体などの構成とすることで、抵抗部３が上方に移動する際の抵抗は上端３１の平面による抵抗によって大きくなり、抵抗部３が下方に移動する際の抵抗は先細る球面によって小さくすることができる。 Further, by configuring the resistance portion 3 as a hemispherical body having a smaller area on the lower end 32 side than the upper end 31 side, the resistance when the resistance portion 3 moves upward is increased by the resistance due to the plane of the upper end 31. The resistance when the resistance portion 3 moves downward can be reduced by the tapered spherical surface.

このような抵抗部３の形状は、半球状体に限定されるものではなく、上端側が平面で下端側が流線形で先細る曲面にすることもできる。このように下方に移動する際の抵抗を小さくすることで、係留ワイヤ４の張力が低減しすぎて弛んでしまうような状態の発生を防ぐことができる。 The shape of the resistance portion 3 is not limited to a hemispherical body, and may be a curved surface having a flat upper end side and a streamlined lower end side. By reducing the resistance when moving downward in this way, it is possible to prevent the occurrence of a state in which the tension of the mooring wire 4 is excessively reduced and becomes loose.

このような動揺低減装置２は、既存の作業船１の側部１１に、回転体５及び定滑車群６を固定するだけで、簡単に取り付けることができる。また、往復部４３の係留ワイヤ４の本数ｎによって流体抵抗力を増加させることができるので、抵抗部３を取り扱いが容易な大きさに抑えることができる。 Such a sway reducing device 2 can be easily attached only by fixing the rotating body 5 and the fixed pulley group 6 to the side portion 11 of the existing work boat 1. Further, since the fluid resistance force can be increased by the number n of the mooring wires 4 of the reciprocating portion 43, the resistance portion 3 can be suppressed to a size that is easy to handle.

さらに、動揺低減装置２を機能させるための設置及び撤去は、ウインチ９を使用して錘部８及び動滑車群７を降ろしたり、引き上げたりするだけで行うことができるので、所望する場所及び期間で簡単に実行できる。 Further, the installation and removal for the function of the sway reducing device 2 can be performed only by lowering or pulling up the weight portion 8 and the moving pulley group 7 using the winch 9, so that the desired place and period can be obtained. Easy to do with.

以上、図面を参照して、本発明の実施の形態を詳述してきたが、具体的な構成は、この実施の形態に限らず、本発明の要旨を逸脱しない程度の設計的変更は、本発明に含まれる。 Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent that the gist of the present invention is not deviated are described in the present invention. Included in the invention.

例えば、前記実施の形態では、半球状体の抵抗部３を使用する場合について説明したが、これに限定されるものではなく、例えば平板状の抵抗部を水平に吊り下げる構成とすることもできる。 For example, in the above-described embodiment, the case where the hemispherical resistance portion 3 is used has been described, but the present invention is not limited to this, and for example, a flat plate-shaped resistance portion may be suspended horizontally. ..

また、前記実施の形態では、回転体５を方向の転換部として説明したが、これに限定されるものではなく、少ない摩擦抵抗で連結線材の方向を転換できる部材であれば、回転しなくてもよい。 Further, in the above-described embodiment, the rotating body 5 has been described as a direction changing portion, but the present invention is not limited to this, and any member capable of changing the direction of the connecting wire with a small frictional resistance does not rotate. May be good.

１ 作業船（係留浮体）
１１ 側部（側方）
２ 動揺低減装置
３ 抵抗部
３１ 上端
３２ 下端
４ 係留ワイヤ（連結線材）
４１，４４ 端部
４３ 往復部
５ 回転体（転換部）
６ 定滑車群
６１ 定滑車
７ 動滑車群
７１ 動滑車
８ 錘部 1 Work boat (mooring float)
11 Side (side)
2 Shaking reduction device 3 Resistance 31 Upper end 32 Lower end 4 Mooring wire (connecting wire)
41, 44 End 43 Reciprocating part 5 Rotating body (converting part)
6 Fixed pulley group 61 Fixed pulley 7 Moving pulley group 71 Moving pulley 8 Weight part

Claims (4)

水上に浮いた状態で係留される係留浮体の動揺低減装置であって、
前記係留浮体の側方から水中に吊り下げられる抵抗部と、
前記抵抗部に一端が接続される連結線材と、
前記係留浮体の側方に取り付けられて前記抵抗部の上方で前記連結線材の方向を転換させる転換部と、
前記転換部から離隔した位置の前記係留浮体の側方に取り付けられる定滑車群と、
前記定滑車群の真下に配置される動滑車群と、
前記動滑車群に接続されて水底に着底させる錘部とを備え、
前記連結線材は、前記転換部で方向転換された後に、張った状態で水平方向に延伸されて前記定滑車群を通って前記動滑車群に架け渡され、前記定滑車群と前記動滑車群との間で複数回の架け渡しがされて前記定滑車群側又は前記動滑車群側に端部が接続されることを特徴とする係留浮体の動揺低減装置。 It is a device for reducing the sway of a moored floating body that is moored while floating on the water.
A resistance part suspended from the side of the mooring float and a resistance part suspended in water.
A connecting wire whose one end is connected to the resistance portion and
A conversion portion attached to the side of the mooring floating body to change the direction of the connecting wire above the resistance portion, and a conversion portion.
A group of fixed pulleys attached to the side of the mooring floating body at a position separated from the conversion portion, and
A group of moving pulleys located directly below the group of fixed pulleys,
It is provided with a weight portion that is connected to the moving pulley group and landed on the bottom of the water.
After the direction is changed at the conversion portion, the connecting wire rod is stretched in a stretched state in the horizontal direction and bridged to the moving pulley group through the fixed pulley group, and the fixed pulley group and the moving pulley group. A device for reducing sway of a mooring floating body, characterized in that an end portion is connected to the fixed pulley group side or the moving pulley group side by being bridged a plurality of times. 前記抵抗部は、上端側より下端側の面積が小さいことを特徴とする請求項１に記載の係留浮体の動揺低減装置。 The rocking reduction device for a moored floating body according to claim 1, wherein the resistance portion has a smaller area on the lower end side than the upper end side. 前記抵抗部は、上端側が平面で下端側が先細る曲面であることを特徴とする請求項２に記載の係留浮体の動揺低減装置。 The rocking reduction device for a moored floating body according to claim 2, wherein the resistance portion has a flat surface on the upper end side and a curved surface on the lower end side. 請求項１乃至３のいずれか一項に記載の係留浮体の動揺低減装置が、両側にそれぞれ取り付けられたことを特徴とする係留浮体。 A mooring floating body according to any one of claims 1 to 3, wherein the sway reducing device for the mooring floating body is attached to both sides of the mooring floating body.
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JPS51151985A (en) * 1975-06-20 1976-12-27 Mitsubishi Heavy Ind Ltd Flo ating structure mooring method
JPS5932586A (en) * 1982-08-17 1984-02-22 Hitachi Zosen Corp Mooring apparatus for buoyant body
US4748927A (en) * 1985-11-01 1988-06-07 Bujacich John S Means and a method for positioning a stabilizer on a boat
JP5194203B2 (en) * 2008-01-23 2013-05-08 国立大学法人神戸大学 Floating mooring device
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