JPH07329880A - Anti-rolling device for floating body type structure - Google Patents

Abstract

PURPOSE:To reduce rolling of a floating body type structure especially in its mooring state concerning the floating body the structure used in a building, a plant, etc. CONSTITUTION:A hydrodynamic damper 10 is provided to reduce rolling of a floating body type structure 1 moored to a mooring pole 3 through a fender 2, the damper 10 is furnished with a casing 19 filled with working fluid and a revolving arm 11 capable of relatively carrying out reciprocal revolution 14, and a head end engagement element 11a of the revolving arm 11 is devised to be horizontally guided along a guide rail 12. When rolling 9 by wind 4 and a wave 5 is caused on a structure 1, a revolution axis 15 integrated with the revolving arm 11 is reciprocally revolved and flowing resistance of the working fluid is generated on an orifice of an rocking member in the casing 19, and the rolling 9 of the structure 1 is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating structure applied to a floating building or plant, a floating pier, etc., and other general floating structures, and more particularly to reducing the shaking in a moored state. The present invention relates to a vibration control device for a floating structure.

[0002]

2. Description of the Related Art FIG. 4 (plan view) and FIG. 5 (elevation view) show a mooring state of a conventional floating structure. Figures 4 and 5
As shown in FIG. 5, the conventional floating structure 1 is only moored to the mooring columns 3 via the fenders 2, and is not provided with sufficient vibration damping means.

[0003]

The floating structure 1 moored under natural environmental conditions is subjected to external forces such as wind 4 and waves 5. Due to the influence of the external force, lateral vibration 8 and lateral vibration 9 occur in the floating structure 1. Since the floating structure 1 is locked by the fender 2 in the vicinity of the water surface 7, the horizontal motion in the upper layer portion of the floating structure 1 becomes large due to the rolling 9. The sway 9 has a natural period (usually about several seconds), and if motion near this natural period is triggered during a windstorm, the floating structure 1 will vibrate violently and its operating rate will decrease. ing. Further, in order to suppress the horizontal motion in the upper layer portion of the floating structure 1 due to the rolling motion 9 within the allowable range, the rise of the floating structure 1 is hindered, which is a factor that impairs its economical efficiency.

The present invention is intended to solve the above-mentioned problems, and it is possible to sufficiently suppress the sway of a floating structure moored to a mooring column due to wind force or wave force. It is an object of the present invention to provide an anti-swing device for a floating structure, which is capable of increasing the number of layers and improving the operating rate.

[0005]

In order to achieve the above-mentioned object, the swinging device for a floating structure according to the present invention is intended to reduce the shaking of a floating structure moored to a mooring column through a fender. , A fluid damper installed between the mooring column and the floating structure, the damper having a casing filled with a working fluid therein, and a horizontal rotary member penetrating the casing in a liquid-tight manner. A moving shaft, a swing member that partitions the inside of the casing into a plurality of fluid chambers, and can swing in association with the reciprocating rotation of the rotating shaft in association with the rotating shaft, and the plurality of fluid chambers. An orifice formed in the rocking member to regulate the flow of the working fluid between them, and a rotating arm having a proximal end fixed to the rotating shaft outside the casing,
A guide rail that guides the engaging element at the tip of the rotating arm in a substantially horizontal direction. One of the floating structure and the mooring column is provided with the casing, and the other is provided with the guide rail. It is characterized by being done.

Further, in the floating structure type vibration damping device of the present invention, the casing is formed as a cylindrical body having a substantially horizontal central axis, and the rotating shaft is disposed along the central axis. The swing member is fixed to the rotary shaft and is formed as a rotary blade that can slide along the inner peripheral surface of the cylindrical body, and is fixed to the inner wall of the casing and slidably contacts the rotary shaft. The fluid chamber is partitioned by the fixed partition wall and the rotating blade.

Further, in the vibration damping device for a floating structure according to the present invention, the casing is formed as a vertical cylindrical body, and the swing member is a piston capable of swinging up and down along a vertical inner wall surface of the casing. It is characterized in that it is provided with an engaging arm whose tip is pivotally attached to the piston and whose base end is fixed to the rotary shaft.

[0008]

In the above-described swinging device for a floating structure according to the present invention,
When the floating structure moored to the mooring column via the fender begins to sway due to wind force, etc., the rotating arm of the damper reciprocates with respect to the casing of the damper while the engaging element at its tip is guided horizontally along the guide rail. Since the movement is performed, the rocking member that is linked to the rotary shaft also rocks in the casing, and the regulated movement of the working fluid is performed between the fluid chambers in the casing through the orifice. . At this time, the circulation resistance (viscous resistance) of the working fluid generated at the orifice suppresses the reciprocating rotation of the rotating arm, and accordingly, the motion of the floating structure is reduced.

Further, when the casing is formed as a horizontal cylindrical body and the rotary shaft is provided with rotary blades that slide along the inner peripheral surface of the horizontal cylinder, the floating structure is shaken. When the rotary shaft reciprocally rotates relative to the cylindrical body, the rotary blade also reciprocates along the inner peripheral wall of the cylindrical body, and the working fluid in the orifice formed in the rotary blade is Due to the flow resistance, the sway of the floating structure can be efficiently suppressed.

Further, in the case where the casing is formed as a vertical cylindrical body, and the rotating shaft is linked to the piston that reciprocally slides along the vertical inner wall surface of the cylindrical body through the engaging arm. When the rotating shaft reciprocally rotates relative to the cylindrical body due to the shaking of the floating structure, the piston also reciprocates up and down in the cylindrical body, and the orifice formed in the piston. The flow resistance of the working fluid in 1 suppresses the sway of the floating structure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an anti-swing device for a floating structure as a first embodiment of the present invention, and FIG. FIG. 3 is an enlarged vertical cross-sectional view showing a portion thereof, and FIG. 3 is a vertical cross-sectional view showing a main portion of a vibration control device for a floating structure as a second embodiment of the present invention, corresponding to FIG.

First, the first embodiment of the present invention will be described. As shown in FIG. 1, also in this embodiment, the floating structure 1 floating on the water surface 7 is moored to the mooring column 3 via the fender 2. ing. A fluid damper 10 is installed between the mooring column 3 and the floating structure 1 so as to reduce the rolling 9 of the floating structure 1 due to the external force of the wind 4 and the waves 5.

The damper 10 is provided with a casing 19 which is filled with a working fluid such as oil or water and is mounted and fixed on the floating structure 1, and a damper attached to the casing 19 and rotatable relative to each other. The moving arm 11 and the engaging member 11 at the tip of the rotating arm 11
A is guided horizontally along a guide rail 12 mounted and fixed on the upper surface of the mooring column 3. As shown in FIG. 2, the casing 19 is formed as a cylindrical body having a horizontal central axis, and the rotary shaft 15 horizontally arranged along the central axis of the casing 19 has an end wall of the casing 19. Is penetrated in a liquid-tight manner, and the base end of the rotating arm 11 is fixed to the rotating shaft 15 outside the casing 19.

Inside the casing 19, there is provided a swinging member 16 as a swinging blade capable of swinging (reciprocatingly swinging) in association with the rotary shaft 15 as the rotary shaft 15 reciprocates. In this embodiment, the swing member 16 is fixed to the rotary shaft 15. The rocking member 16 is fixed to the inner wall of the casing 19 and the fixed partition wall 19a slidably contacting the rotating shaft 15 together with the casing.
The inside of 19 is partitioned into a plurality of fluid chambers 18. Also, the swing member
An orifice 17 is formed in the fluid passage 16 so that the fluid chambers 18 communicate with each other.

Since the floating structure type vibration damping device according to the first embodiment is constructed as described above, when the rolling structure 9 rolls on the floating structure 1 due to an external force, the casing 19 moves up and down 13. As a result, the rotating arm 11 makes a reciprocating rotation 14 with respect to the casing 19 while horizontally reciprocating the engaging element 11a at the tip thereof along the guide rail 12.

Therefore, the swinging member that is associated with the rotating shaft 15
16 also swings in the casing 19, so that the regulated movement of the working fluid is performed between the fluid chambers 18 in the casing 19 through the orifices 17. At that time, the orifice
Due to the flow resistance of the working fluid generated at 17, the reciprocating rotation of the rotating arm 15 is suppressed, and the fluctuation of the floating structure 1 is suppressed accordingly.

In this way, the fluctuation of the floating structure 1 due to the wind force or the like is reduced, so that the operating rate of the structure 1 can be increased and the height of the structure can be increased. In the first embodiment, the casing 19 of the damper 10 is mounted and fixed on the floating structure 1, and the engaging element at the tip of the rotating arm 11 thereof.
The guide rail 12 for guiding 11a is placed and fixed on the mooring column 3, but conversely, the casing 19 is placed and fixed on the mooring column 3 so that the guide rail 12 is placed and fixed on the floating structure 1. May be.

Next, a description will be given of a vibration control device for a floating structure according to a second embodiment of the present invention. FIG. 3 shows a main part of the device corresponding to FIG. 2. As shown in FIG. Also in the case of this embodiment, the casing 19 of the damper is mounted and fixed on a floating structure not shown. A guide rail that can horizontally guide an engaging element (not shown) at the tip of the rotating arm 11 is mounted and fixed on the mooring column.

In the second embodiment, in particular, the casing 19 is formed as a vertical cylindrical body, and the piston 20 as a swinging member provided inside the casing 19 is the casing 19.
It can swing up and down along the vertical inner wall surface of the. A horizontal rotary shaft that penetrates the casing 19 in a liquid-tight manner
The outer end of 15 is fixed to the base end of the rotating arm 11 outside the casing 19, and the engaging arm 15 whose tip is pivotally attached to the piston 20.
The base end of a is integrally fixed to the rotary shaft 15.

In this way, the inside of the casing 19 is partitioned into the plurality of fluid chambers 18 by the piston 20, and the orifice 17 is provided so that the fluid chambers 18 communicate with each other.
Formed in 20.

With the above-mentioned structure, in the case of the second embodiment, when the rotating arm 11 reciprocally rotates 14 relative to the casing 19 as a cylindrical body due to the motion of the floating structure,
The piston 20 also moves up and down 21 in the casing 19,
The flow resistance of the working fluid in the orifice 17 formed in the piston 20 suppresses the sway of the floating structure, and thus the operation of the floating structure is performed in the same manner as in the first embodiment. It is possible to obtain effects such as an improvement in the rate and an increase in the number of layers.

[0022]

As described in detail above, according to the vibration control device for a floating structure of the present invention, the following effects can be obtained. (1) When the floating structure is shaken by an external force, the tip engaging element of the rotary arm of the fluid damper installed between the structure and the mooring column is guided horizontally along the guide rail. As a result, the rotary arm reciprocally rotates relative to the damper casing, causing a flow resistance (viscous resistance) of the working fluid at the orifice of the swing member in the casing, which results in a floating structure. It is possible to accurately suppress the shaking of an object. (2) According to the above item (1), it is possible to increase the operating rate of the floating structure and increase the height of the structure. (3) When the damper casing is formed as a substantially horizontal cylindrical body and the swinging member in the casing is formed as a rotary vane with an orifice, a sufficient swinging effect can be obtained with a simple structure. Like (4) Even when the damper casing is formed as a vertical tubular body and the swing member is formed as a piston that swings up and down, a sufficient swinging effect can be obtained with a simple structure.

[Brief description of drawings]

FIG. 1 is a side view showing a vibration control device for a floating structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view showing a main part of the apparatus shown in FIG.

FIG. 3 is a vertical cross-sectional view showing a main part of a vibration control device for a floating structure according to a second embodiment of the present invention, corresponding to FIG.

FIG. 4 is a plan view showing a mooring state of a conventional floating structure.

FIG. 5 is an elevational view of the floating structure of FIG.

[Explanation of symbols]

 1 Floating Structure 2 Fender 3 Mooring Column 4 Wind 5 Wave 7 Water Surface 8 Left / Right Shake 9 Roll 10 Damper 11 Rotating Arm 11a Engager 12 Guide Rail 13 Vertical Shaking 14 Reciprocating Rotation 15 Rotating Shaft 15a Engaging Arm 16 Rotating blade 17 Orifice 18 Fluid chamber 19 Casing 19a Partition wall 20 Piston 21 Vertical reciprocating motion

Claims (3)

[Claims] 1. A fluid damper provided between the mooring column and the floating structure to reduce the sway of the floating structure moored to the mooring column via a fender. A damper has a casing filled with a working fluid, a horizontal rotary shaft penetrating the casing in a liquid-tight manner, and a reciprocating rotary shaft of the rotary shaft while partitioning the inside of the casing into a plurality of fluid chambers. Accordingly, a swinging member that can swing together with the rotation shaft, an orifice formed in the swinging member to restrict the flow of the working fluid between the plurality of fluid chambers, and the outside of the casing. And a guide rail that guides the engaging element at the tip of the rotating arm in a substantially horizontal direction.
An anti-sway device for a floating structure, wherein the casing is provided on one of the floating structure and the mooring column, and the guide rail is provided on the other. 2. The rocking device for a floating structure according to claim 1, wherein the casing is formed as a cylindrical body having a substantially horizontal central axis, and the rotating shaft is arranged along the central axis. At the same time, the swing member is fixed to the rotary shaft to form a rotary blade that can slide along the inner peripheral surface of the cylindrical body, and is fixed to the inner wall of the casing. A swinging device for a floating structure, characterized in that the fluid chamber is partitioned by a fixed partition wall that slidably contacts with the rotary blade and the rotary vane. 3. The rocking device for a floating structure according to claim 1, wherein the casing is formed as a vertical cylindrical body, and the rocking member rocks vertically along a vertical inner wall surface of the casing. Of a floating structure, which is formed as a movable piston, and has an engaging arm having a distal end pivotally attached to the piston and a proximal end fixed to the rotating shaft. apparatus.