JP2006103449A - Rocking reduction device for floating body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rocking reduction device for a floating body structure capable of suppressing rocking such as not only rolling and pitching but also vertical rocking against waves in a wide range, not requiring a large amount of reinforcement members and capable of easy relocation. <P>SOLUTION: A rocking reduction plate member 12 is hung down on the lower part of a floating body structure 11 through a connection member 13 within a slight distance from a sea bottom S or a predetermined distance for landing. Thereby, a mass corresponding to an additional mass such as the vertical rocking, rolling and pitching of the floating body structure 11 is largely increased and a natural period of each rocking can be set to a longer period side. An amplitude in rocking is reduced by increasing the viscous damping force of vertical rocking, rolling, pitching, front/rear rocking, left/right rocking and yawing. Further, the hung down rocking reduction plate member 12 is rolled up on the bottom of the floating body structure 11 and the structure can be moved with reduced resistance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a floating structure sway reduction device, a floating port facility such as a floating pier, a work ship used for offshore construction such as a floating crane, and a floating structure such as a work floating body used for various uses in coastal areas. This is designed to reduce the vertical, horizontal, vertical, forward / backward, left / right, and bow motions.

  Conventionally, various types of floating structures have been used. For example, in floating piers, which are floating port facilities, to improve ride comfort for passengers and workers, and to improve work efficiency and efficiency during unloading and loading. Moreover, in the work boats used for offshore construction, reduction of the sway due to waves is a major issue in order to improve the construction operation rate.

  Various proposals have been made for reducing the fluctuation of such a floating structure. For example, in Patent Document 1, as shown in FIG. The thing which reduces fluctuation by attaching so that it protrudes in is disclosed.

  Further, as shown in FIG. 12, Patent Document 2 discloses a technique that reduces shaking by attaching a combination of a vertical plate 2 and a horizontal plate 3 to a side surface of a body of a floating body 1.

  Further, as shown in FIG. 13, Patent Document 3 discloses a technique for reducing fluctuations by coupling the underwater plate 5 in parallel with the draft line from the bottom surface of the floating body 1 through the rod-shaped connecting member 4. .

  Further, in Patent Document 4, as shown in FIG. 14, vibration is reduced by attaching the connecting member 4 and the flat plate 5 so as to vibrate in a pendulum manner before and after the floating body 1 via the rotary joint 6. Is disclosed.

Furthermore, in Patent Document 5, as shown in FIG. 15, a wave-dissipating device is configured by a flat plate 7 arranged in a step shape in water, and a plurality of floating bodies 1 are provided on the upper surface side of the step-like flat plate 7. A frame body 8 assembled in a lattice shape on the lower surface side of the flat plate 7 and an anti-vibration plate 9 attached to the lower surface of the frame body 8 to reduce the fluctuation of the mega float is disclosed.
JP 2002-37184 A Japanese Patent Laid-Open No. 2004-58691 JP-A-8-324484 Japanese Patent Laid-Open No. 2003-212185 Japanese Patent Laid-Open No. 2002-250020

  However, in the structure of Patent Document 1, there is a problem that the vibration reduction effect by the vertical plate 2 is small, and there is a problem that it is effective only for rolling and pitching, and the vertical plate 2 to the lower part of the floating body 1 is increased in order to increase the vibration reduction effect. When the amount of protrusion is increased, when the water depth is shallow, there arises a problem that the floating body 1 cannot be installed due to interference with the seabed.

  Further, in the structure of Patent Document 2, since a horizontal plate 3 protruding horizontally to the side of the floating body 1 is provided, if it is applied to a work ship, it cannot be pushed by a tugboat or applied to a floating bridge. Then, there is a problem of interference with the hull to be moored. Furthermore, when such a vertical plate 2 and a horizontal plate 3 are combined, there is a problem that the wave period that can reduce the fluctuation is limited and it is not possible to deal with a wide range of wave periods.

  Further, in the structures of Patent Documents 3 to 5, since the underwater plate 5 and the vibration reducing plate 9 are attached to the lower part of the floating body 1 and the flat plate 7 via the rod-like connecting member 4 and the lattice-like frame body 8, the supporting strength There is a problem that a large reinforcing member is required to ensure the above. Furthermore, when the floating body 1 is moved, there is a problem that the connecting member 4, the frame body 8, and the like increase in resistance, and a larger tug is required as compared with the case of the ordinary floating body 1 alone. Further, when the draft is deepened by the amount of the connecting member 4 and the frame body 8 and interferes with the bottom of the sea, and cannot be applied to a shallow sea area. There is a problem that large-scale refurbishment or the like is required especially when trying to apply to existing floating bodies.

  The present invention has been made in view of the problems of the prior art, and can suppress not only rolling and pitching but also other vertical shaking and the like, and can suppress shaking for a wide range of waves. An object of the present invention is to provide a fluctuation reducing device for a floating structure that does not require a large amount of reinforcing members and can be easily moved.

  As a result of intensive studies to solve the above-mentioned problems of the conventional technology, the floating structure can be swayed vertically, horizontally, and vertically by hanging the plate member from the seabed with a slight space. Can be increased dramatically, the natural period of each oscillation can be set to the long period side, up and down, roll, pitch, forward and backward, left and right of the floating structure The present inventors have found that the amplitude when swinging by increasing the viscous damping force of bow swing can be reduced, and the present invention has been completed.

  That is, according to the first aspect of the present invention, the fluctuation reducing device for a floating structure according to the first aspect of the present invention suspends the fluctuation reducing plate member within a predetermined distance from the seabed via a connecting member at the lower part of the floating structure. It is characterized by being lowered.

  According to the fluctuation reducing device for a floating structure, the floating structure is suspended from the bottom of the floating structure within a predetermined distance from the seabed to a slight distance or by suspending the fluctuation reducing plate member via a connecting member. Can be dramatically increased, and the natural period of each oscillation can be set to the long period side. By increasing the viscous damping force of shaking, longitudinal shaking, forward / backward shaking, left / right shaking, and bow shaking, it becomes possible to reduce the amplitude when shaking. In addition, the suspended fluctuation reducing plate member can be moved around the bottom of the floating structure with less resistance.

  Furthermore, the fluctuation reducing device for a floating structure according to the present invention is configured such that, in addition to the above-described configuration, the connecting member is a linear member such as a chain, a wire, or a rope, and the position of the fluctuation reducing plate member by the linear member is Winding / feeding means that can be adjusted, or the sway reduction plate member is divided into one or a plurality having a size equal to or less than the water line area of the floating structure, The sway reduction plate member may be suspended from the seabed at a distance within 1/4 of the sum of the short sides of the sway reduction plate member.

  In addition to the above-described configurations, the fluctuation reducing device for a floating structure according to the present invention may be configured such that the fluctuation reducing plate member is suspended from the bottom of the sea, or is suspended from the fluctuation reducing plate member at the sea bottom. A penetrating member that penetrates may be provided, or the fluctuation reducing plate member may be configured to be in close contact with the lower surface of the floating structure when the floating structure is moved.

  Furthermore, the fluctuation reducing device for a floating structure according to the present invention is provided with distance detecting means for detecting a distance from the seabed in the fluctuation reducing plate member, in addition to the above-described components, and the fluctuation reducing plate based on the detection signal. The suspension position of the member is set, the control means for automatically adjusting the suspension position by controlling the winding / feeding means based on the detection signal of the distance detection means, or the fluctuation reducing plate member, It can also be made to suspend so that it may straddle a some floating body structure via a connection member.

  According to the fluctuation reducing device for a floating structure according to claim 1 of the present invention, the fluctuation reducing plate member is suspended from the bottom of the floating structure within a predetermined distance from the seabed via a connecting member. Since it has been lowered, it is possible to dramatically increase the additional mass of floating structures such as vertical, horizontal, and vertical vibrations, and set the natural period of each oscillation to the long period side. In addition, it is possible to reduce the amplitude when the floating structure is shaken by increasing the viscous damping force of vertical, horizontal, vertical, forward / backward, left / right, and bow swings. Further, the suspended vibration reduction plate member can be moved around the bottom of the floating structure with less resistance.

  Furthermore, according to the fluctuation reducing device for a floating structure according to claim 2 of the present invention, the connecting member is constituted by a linear member such as a chain, a wire, or a rope, and its winding / feeding means. The position of the reduction plate member from the sea bottom can be easily adjusted, and the reduction plate member can be connected to the floating structure without requiring a reinforcing member. Moreover, in invention of Claim 3, by making the said vibration reduction board member into 1 thru | or plurality as the magnitude | size of the water line area of the said floating body structure thru | or the same or less, it has a fluctuation reduction effect. While being able to adjust with the area of a fluctuation reduction board member, it can respond easily to shapes, such as an unevenness | corrugation and inclination of a seabed part. Furthermore, in the invention according to claim 4, since the fluctuation reducing plate member is suspended at a distance within 1/4 of the sum of the short sides of the fluctuation reducing plate member from the seabed, the fluctuation reducing plate member If there is one sheet, the length of one short side, and in the case of multiple sheets, it is within ¼ of the total length including one short side of each sway reduction plate member. Can be increased, and the viscous damping force can be increased.

  Moreover, according to the fluctuation reducing apparatus for a floating structure according to claim 5 of the present invention, the installation effect of the fluctuation reducing plate member is further enhanced by suspending the fluctuation reducing plate member on the bottom of the sea. In addition, it is only necessary to install the connecting member so that it does not sag. Further, in the invention according to claim 6, by providing the sway reduction plate member with a penetrating member that penetrates into the seabed, the sway reduction plate member has a holding force with respect to the horizontal movement of the floating structure. It can have a function as an anchor. Further, in the invention according to claim 7, since the fluctuation reducing plate member is configured to be able to come into close contact with the lower surface of the floating structure during the movement of the floating structure, there is almost no increase in resistance during the movement. Can move.

  Further, according to the fluctuation reducing device for a floating structure according to claim 8 of the present invention, the fluctuation reducing plate member is provided with distance detecting means for detecting a distance from the seabed, and the fluctuation reduction is performed based on the detection signal. Since the suspension position of the plate member is set, the fluctuation reducing plate member can be installed within a predetermined distance from the seabed by the detection signal of the distance detection means. In the invention according to claim 9, since the control means for automatically adjusting the hanging position by controlling the winding / feeding means based on the detection signal of the distance detecting means is provided, It can be installed within a predetermined distance from the seabed. Furthermore, in the invention described in claim 10, the fluctuation reducing plate member can be suspended so as to straddle a plurality of floating structures via the connecting member, and the number of connecting members can be reduced to simplify the apparatus. Can be achieved.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
1 to 4 relate to an embodiment in which the apparatus for reducing fluctuation of a floating structure according to the present invention is applied to a floating body, FIG. 1 is a schematic configuration diagram in a normal use state, and FIG. 2 is a schematic configuration diagram in a movement state. FIG. 3 is a schematic configuration diagram of the usage state at the inclined seabed, and FIG. 4 is a schematic configuration diagram of the usage state with the bottom.

  The fluctuation reducing device 10 for a floating structure is used as a floating structure, for example, to reduce the fluctuation of the floating body 11, and the flat structure 12 is a wire as a connecting member as a fluctuation reducing plate member downward from the floating body 11. 13 and a winch 14 serving as a winding / feeding-out means, and does not approach the seabed S within a predetermined distance L from the seabed S, and is installed by being bottomed as shown in FIG.

  As a result, the flat structure 12 is suspended in the lower part of the floating body 11 with the sea bottom S and a slight space, and is suspended by the wire 13 and the winch 14. Corresponding ones can be dramatically increased, and each natural period can be set to the long period side away from the normal wave period, and fluctuations can be suppressed for a wide range of waves. .

  In particular, by suspending the flat structure 12 suspended from the lower part of the floating body 11 on the seabed S so that the wire 13 does not sag, it is possible to further increase the amount corresponding to the added mass and reduce the fluctuation. The effect can be further increased.

  Further, in the floating structure vibration reduction device 10, the flat structure 12 increases the viscous damping force of the floating body 11, such as vertical, horizontal, vertical, forward / backward, left / right, and bow. Reduce the swing amplitude when. The effect of reducing the amplitude of the shaking can be further increased by making the flat structure 12 settle on the seabed S so that the wire 13 does not sag.

  In such a floating structure vibration reduction device 10, as shown in FIG. 1, for example, two flat structures 12 and 12 are suspended from the short side of the floating body 11. The flat plate-like structure 12 as the reduction plate member only needs to secure a total area that is the same as or smaller than the water line area of the floating body 11 (the area of the horizontal cross section at the waterline) as the size of the flat plate structure. The configuration is not limited to 12 and 12, but may be configured by one flat structure 12 or a larger number of flat structures as shown in FIG.

  Further, the flat structure 12 may be constituted by a single solid plate, a plate shape with a frame made of a plate material and a reinforcing material, or a hollow box shape, which is necessary. In addition to metal materials, synthetic resin materials can be used as long as strength and corrosion resistance can be secured. Furthermore, the plate-like structure 12 as the fluctuation reducing plate member does not necessarily have to be a rectangular plate shape. If the plate-like structure is a wide plate shape, a flat plate-like structure can be perforated, an uneven shape or a comb shape. The surface shape may be any shape.

  The distance L from the seabed portion S of the flat structure 12 as such a fluctuation reducing plate member is an all flat shape in which one short side b1 and b2 of each flat structure 12 suspended from the floating body 11 is added. When the width B (= b1 + b2) of the structure is set, (L =) B / 4 or less, that is, by setting the bottom to 0 to B / 4 at the maximum, a high vibration reduction effect can be obtained.

  That is, in a tank experiment using a model, the distance L between the seabed S and the plate that is the flat structure 12 is 0 (bottom), B / 32, B / 4, and a plate for comparison. FIG. 7 shows an example of the result of measuring the swinging of the floating body in the case of none (the horizontal axis is ω: angular frequency (rad / sec), the vertical axis is Ζ / ζ: vertical swing response value (cm / Cm)), the case of roll is shown in FIG. 8 (the horizontal axis is ω: angular frequency (rad / sec), and the vertical axis is Φ / ζ: roll response value (deg / cm)).

As can be seen from FIGS. 7 and 8, the effect of reducing the sway by the plate-like structure plate is large when the horizontal axis ω is small and the cycle is long, and the effect is greater as the distance L from the bottom becomes smaller. .

Also, in rolling, as shown in FIG. 8, when the plate, which is a plate-like structure, is separated from the bottom (comparison between a solid line and an alternate long and short dash line), the peak of the natural period is obtained when the plate is suspended. It can be seen that there is a fluctuation reduction effect due to the shift to the long period side, but the natural period peak also decreases with the increase of the fluctuation reduction effect by bringing the plate closer to the seabed S.

From such an experimental result, the distance L between the flat structure 12 as the fluctuation reducing plate member and the seabed S is within a range of B / 4 according to the fluctuation condition required by the use application of the floating body 11 or the like. And set it.

  In the floating structure vibration reduction device 10, the flat structure 12 is suspended by the wire 13 and the winch 14 as the fluctuation reducing plate member, so that the wire 13 is wound up or fed out by the winch 14. This makes it possible to easily adjust the hanging position of the flat structure 12.

Therefore, as shown in FIG. 3, when the seabed S is inclined, the length of the wire 13 is adjusted by the winch 14 to suspend the flat structure 12 in parallel with the inclined surface S1. It becomes easy, and can be installed without impairing the vibration reduction effect. Further, as shown in FIG. 4, when the flat structure 12 is bottomed at the sea bottom S, the length of the wire 13 is adjusted by the winch 14 so that the wire 13 is not slackened. The structure 12 can be installed.

Further, in the fluctuation reducing device 10 of the floating structure, a distance sensor 15 such as an ultrasonic sensor is provided as a distance detecting means for detecting the distance L from the seabed S to the flat structure 12 which is a fluctuation reducing plate member. Then, a detection signal is input to the control device 16 as a control means for controlling the winch 14, the distance is displayed on the display unit 17, and the winch 14 is automatically controlled.

Accordingly, the detection result of the distance sensor 15 can be read from the display unit 17 and the winch 14 can be manually operated to adjust the installation position of the flat structure 12, and the winch 14 can be automatically controlled by the control device 16. The installation position of the flat structure 12 can also be automatically adjusted.

As a result, not only can the flat structure 12 be installed at an arbitrary water depth, but the flat structure 12 can be always installed at a predetermined position with respect to fluctuations in tide level, etc. It can be adjusted by changing the position of the structure 12.

Further, in the floating structure vibration reduction device 10, when the floating body 11 is to be moved, as shown in FIG. 2, the flat structure 12, which is a fluctuation reducing plate member, is brought into close contact with the bottom of the floating body 11. Further, by winding up with the winch 14, the resistance at the time of movement can be greatly reduced, and towing can be performed with a towing force almost the same as when towing only the floating body 11.

  In addition, when it is not necessary to move the floating body 11 which is a floating body structure and is always installed in the same position, as shown in FIG. 6, the flat structure 12 is directly suspended by the wire 13 which is a connecting member. In addition, the winch 14 may be omitted, and the structure can be further simplified and the cost can be reduced.

  Moreover, in this fluctuation reducing device 10 for a floating structure, the case where the wire 13 is used as a connecting member that connects and suspends the floating body 11 and the flat structure 12 that is a fluctuation reducing plate member has been described as an example. It is not limited to 13, and a string-like member such as a chain or a rope may be used, or a rod-like highly rigid member may be used.

  Although not shown in the drawings, the floating structure sway reduction device 10 is used by towing the floating body 11 to a predetermined installation sea area, and then anchoring the floating body 11 with a mooring member such as a chain.

According to the fluctuation reducing device 10 of the floating structure structured as described above, the flat structure 12 as the fluctuation reducing plate member is suspended from the floating body 11 and installed within a predetermined distance L from the seabed S. The mass and the viscous damping force are greatly increased, and the rolling, vertical, vertical, forward / backward, left / right, and bow of the floating body 11 can be suppressed to a very small level.

  Moreover, by making the flat structure 12 settle to the seabed S, the above-mentioned sway reduction effect can be further increased, and the holding power against horizontal movement can be obtained by the flat structure 12 that has been settled. As a result, the anchoring member such as the anchoring chain for anchoring the floating body 11 can be made thin.

  Furthermore, in the fluctuation reducing device 10 for the floating structure, the flat structure 12 that is a fluctuation reducing plate member is a simple mechanism that is suspended from the floating body 11 with a wire 13 or the like and suspended at or near the seabed S. There is little need to modify the floating structure, and it can be easily applied to existing floating structures.

Moreover, even if the water depth in the sea area where the floating body 11 is installed changes, it can be easily coped with by adjusting the length of the wire 13 or the like that suspends the plate-like structure 12 that is a fluctuation reducing plate member. When the winch 14 as means is provided, the installation position of the flat structure 12 can be adjusted more easily.

Furthermore, by adjusting the distance L from the seabed S of the flat structure 12 that is a fluctuation reducing plate member, the fluctuation reduction amount can be adjusted, and the fluctuation state of the floating body 11 can be adjusted. .

Further, by lifting the flat structure 12 that is the suspended vibration reduction plate member so as to be in close contact with the bottom of the floating body 11, the resistance when moving the floating body 11 can be reduced, and the floating body can be easily towed. Become.

Further, by dividing the flat structure 12 which is a fluctuation reducing plate component into a plurality of parts and installing them, the distance L from the seabed S can be increased even when the seabed S is inclined or uneven. It becomes easy to hold within the predetermined range, and the sway reduction effect can be ensured regardless of the topography of the seabed S.

  Further, if the installation position of the flat structure 12 is automatically adjusted by providing the distance sensor 15 and the control device 16, the distance L of the seabed S can be kept constant even when there is a change in the tide level. And the effect of reducing shaking can be kept constant.

  By installing such a sway reduction device 10 for floating structures, floating port facilities such as floating piers, work vessels used for offshore construction such as floating cranes, working floats used for various uses in coastal areas, etc. For example, in the floating pier, which is a floating port facility, the ride quality of passengers and workers can be improved. It is possible to improve workability during loading and increase efficiency, and it is also possible to improve the operation rate of work vessels used for offshore construction.

Next, another embodiment of the present invention will be described with reference to FIG.
In the floating structure vibration reduction device 10A, a flat plate-like structure 12A, which is a fluctuation reducing plate member, is suspended so as to span a plurality of floating bodies 11, 11A, and each floating body 11, 11A also has a flat plate-like structure. 12 is suspended.

  Other configurations for suspending the flat structure 12A so as to straddle the plurality of floating bodies 11, 11A are various, such as the distance L from the seabed S and the use of a winch, as in the embodiment described above. You may make it comprise by correspondence.

  According to such an apparatus for reducing the vibration of a floating structure 10A, the same effect as that of the above embodiment can be obtained, and the number of the fluctuation reducing plate members for the plurality of floating bodies 11, 11A can be reduced to simplify the structure. Can be

  Further, if the flat structures 12 and 12A, which are the vibration reduction plate members, are settled, a horizontal holding force is generated, and a mooring member such as a mooring chain or a mooring line mooring the floating bodies 11 and 11A is generated. It is also possible to reduce the number of wires, making it easier to route.

Next, still another embodiment of the present invention will be described with reference to FIG.
In this floating structure vibration reduction device 10 </ b> B, a function as an anchor is added to a flat plate structure 12 that is a fluctuation reduction plate member suspended from the floating body 11, and the bottom surface of each flat plate structure 12 is provided. A plurality of pile members 18 such as steel pipes protruding downward as penetrating members penetrating the seabed S are attached.

  In addition, the structure other than attaching the pile member 18 as a penetrating member that adds a function as an anchor to the flat structure 12 is the distance L from the seabed S, as in the above-described two embodiments. , Whether or not a winch is used, or a flat structure straddling a plurality of floating bodies may be used.

  According to such a sway reduction device 10B for a floating structure, the sway reduction effect similar to that of the above embodiment is achieved, and the pile member 18 is penetrated into the seabed S as a penetration member attached to the flat structure 12. By doing so, it is possible to obtain a greater horizontal holding force than when the flat structure 12 is bottomed, and a mooring member 19 such as a mooring chain or mooring line mooring the floating body 11. Can be made thin. And until this pile member 18 remove | deviates from the seabed part S, the rocking | fluctuation of the floating body 11 can be suppressed with the holding force, and after the pile member 18 remove | deviates from the seabed, it is the flat form installed in the seabed part S vicinity. The fluctuation reduction effect by the structure 12 can be obtained and the fluctuation of the floating body 11 can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the normal use condition concerning one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic block diagram of the movement state concerning one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic block diagram of the use condition in the inclined seabed part concerning one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the use condition which was settled according to one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic block diagram of the normal use condition concerning other one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic block diagram of the normal use condition concerning further another embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a graph of the vertical shaking reduction which shows the result of the water tank experiment which applied the shaking reduction apparatus of the floating body structure of this invention to the floating body. It is a graph of rolling reduction which shows the result of the water tank experiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic block diagram of the use state which made the bottom concerning one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to several floating bodies. It is a schematic block diagram of the normal use condition concerning other one Embodiment which applied the fluctuation reduction apparatus of the floating body structure of this invention to the floating body. It is a schematic side view of the conventional fluctuation reducing device for a floating structure. It is a schematic perspective view of the conventional fluctuation reducing device for a floating structure. It is a schematic perspective view of the conventional fluctuation reducing device for a floating structure. It is a schematic perspective view of the conventional fluctuation reducing device for a floating structure. It is a schematic side view of the conventional fluctuation reducing device for a floating structure.

Explanation of symbols

10, 10A, 10B Fluctuation reduction device for floating structure 11, 11A Floating body (floating structure)
12, 12A flat structure (sway reduction plate member)
13 Wire (connection member)
14 winches (winding and feeding means)
15 Distance sensor (distance detection means)
16 Control device (control means)
17 Distance display 18 Pile member (penetration member)
19 Mooring line (Mooring member)
S Seabed S1 Slope (Seabed)
L Predetermined distance from seabed B B Width of all flat structures b1, b2 Width of one short side of each flat structure

Claims (10)

  A fluctuation reducing device for a floating structure, wherein the fluctuation reducing plate member is suspended within a predetermined distance from the seabed via a connecting member at a lower part of the floating structure.   The connecting member is constituted by a linear member such as a chain, a wire, or a rope, and is provided with winding / feeding means that can adjust the position of the vibration reduction plate member by the linear member. The apparatus for reducing vibration of a floating structure according to claim 1.   The floating structure according to claim 1 or 2, wherein the fluctuation reducing plate member has a size equal to or less than a water line area of the floating structure and is divided into one or more. Sway reduction device.   The floating body according to any one of claims 1 to 3, wherein the fluctuation reducing plate member is hung from the seabed at a distance within 1/4 of a sum of one short side of the fluctuation reducing plate member. Structure shake reduction device. The apparatus for reducing a fluctuation of a floating structure according to any one of claims 1 to 4, wherein the fluctuation reduction plate member is suspended from the bottom of the sea.   6. The fluctuation reducing device for a floating structure according to claim 5, wherein the fluctuation reducing plate member is provided with a penetrating member penetrating into the seabed.   The fluctuation reducing device for a floating structure according to any one of claims 1 to 6, wherein the fluctuation reducing plate member is configured to be able to come into close contact with a lower surface of the floating structure when the floating structure is moved. The distance reduction means which detects the distance with a seabed part is provided in the said fluctuation reduction board member, The suspension position of the said fluctuation reduction board member is set based on this detection signal, Any one of Claims 1-7 characterized by the above-mentioned. A device for reducing fluctuation of a floating structure according to claim 1.   9. The apparatus for reducing sway of a floating structure according to claim 8, further comprising control means for automatically adjusting a suspension position by controlling the winding / feeding means based on a detection signal of the distance detecting means. The apparatus for reducing sway of a floating structure according to any one of claims 1 to 9, wherein the sway reduction plate member is suspended so as to straddle a plurality of floating structures via a connecting member.

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