JP2005239157A - Swinging reduction device of floating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swinging reduction device of a floating body capable of reducing the swinging relative to the incident wave of the floating body. <P>SOLUTION: Underwater overhanging members 4a, 4b overhanging the over-wave side and down-wave side from the wall surface of the floating body 1, are provided on the floating body 1 floating on the water. The swinging reduction device of the floating body has a vertical plate 7 extending downward from the bottom surface of the floating body 1 at the outside of the underwater overhanging members 4a, 4b, and the attenuating floating bodies 6 divided into a plurality of pieces in the orthogonal direction to the wave direction are turnably mounted in the wave direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  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.

  FIG. 15 shows an example of a device proposed as a device for reducing fluctuation of a floating body such as a floating pier. As shown in FIG. 15, a water surface projecting member g is fixed on the wave upper side and wave lower side of the floating body e, and the water surface projecting member g is spaced apart 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.

  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.

  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.

  In order to achieve the above object, according to the first aspect of the present invention, in the floating body main body floating on the water, a water surface lowering member that protrudes outward on the wave upper side and wave lower side from the wall surface of the floating body main body is provided. A vertical plate extending below the bottom surface of the floating body main body is provided outside the underwater projecting member, and an anti-vibration floating body divided into a plurality of parts in a direction perpendicular to the wave direction is rotatably attached to the wave direction. The present invention provides a floating body sway reduction device.

  A second aspect of the present invention is characterized in that the natural periods of the fluctuations of the floating body main body and the anti-sway floating body according to the first aspect are substantially equal.

  As described above, according to the first and second aspects, the water surface projecting member that protrudes outward from the wall surface of the floating body is provided on the wave upper side and the wave lower side, and the vertical plate is provided on the water surface projecting member. It is characterized by that. Therefore, the underwater overhang member has the effect of stabilizing the floating body, and by providing a vertical plate on the underwater overhang member, when an incident wave is applied to the vertical plate from the wave upper side, the vibration is integrally reduced with the vertical plate. When the floating body is tilted and the restoring force due to the buoyancy of the anti-swaying floating body exceeds the force of the incident wave, the anti-swaying floating body returns to the opposite direction, and the effect of the incident wave on the floating body can be reduced by repeating this.

  Embodiments of the present invention will be described below with reference to the drawings.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  As a result, the swinging of the floating body 1 is suppressed as in FIG. In addition, although it is an effect | action of the space | interval 18, if this clearance gap does not exist, water will be confined between a floating body bottom face and a board without a clearance gap, and it will become a thing without a rocking effect like a simple box type floating body. If there is a gap, such a reverse effect is prevented because water passes.

  FIG. 10 shows a first modification of the sixth embodiment, in which a vertical plate 19 extending downward with a space 18 is fixed at the intermediate portion of the bottom surface 1c of the floating body 1 in the front-rear direction. The operation is the same as in the sixth embodiment.

  11 (a) and 11 (b) show a second modification of the sixth embodiment, in which a support member 21 extending horizontally below the water surface is provided on the wave upper side 1a and wave lower side 1b of the floating body 1 on the wave upper side and wave lower side. The 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 the intervals 23a and 23b are provided between the floating body 1 and the vertical plates 22a and 22b. is there.

  As a result, the swinging of the floating body 1 is suppressed as in FIG. In addition, although it is an effect | action of the space | interval 18, if this clearance gap does not exist, water will be confined between a floating body bottom face and a board without a clearance gap, and it will become a thing without a rocking effect like a simple box type floating body. If there is a gap, such a reverse effect is prevented because water passes.

  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.

  Next, experimental results using the model floating body will be described. FIG. 12 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.

  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.

  Next, FIG. 13 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.

  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.

  Next, FIG. 14 shows an experiment in which a swinging floating body with a hinge 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.

  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.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of this invention is shown, (a) is a side view of the floating body sway reducing apparatus, (b) is the figure seen from the arrow BB direction of (a). The side view of the fluctuation reduction apparatus of the floating body which shows the modification 1 of the embodiment. The side view of the fluctuation reduction apparatus of the floating body which shows the modification 2 of the embodiment. The side view of the fluctuation reduction apparatus of the floating body which shows 2nd Embodiment of this invention. The side view of the fluctuation reduction apparatus of the floating body which shows the 3rd Embodiment of this invention. The side view of the fluctuation reduction apparatus of the floating body which shows 4th Embodiment of this invention. The side view of the fluctuation reduction apparatus of the floating body which shows the modification of the embodiment. The side view of the fluctuation reduction apparatus of the floating body which shows 5th Embodiment of this invention. The 6th Embodiment of this invention is shown, (a) is a side view of the floating body sway reducing device, and (b) is a view seen from the direction of arrow D in (a). The side view of the fluctuation reduction apparatus of the floating body which shows the modification 1 of the embodiment. The modification 2 of the embodiment is shown, (a) is a side view of a sway reduction device for a floating body, (b) is a view seen from the arrow E direction of (a). The figure which shows the experimental example of Roll amplitude of the floating body provided with the swinging floating body with a hinge. The figure which shows the experimental example of Roll amplitude of the floating body provided with the vertical board. The figure which shows the experiment example which measured the Heave amplitude of the floating body provided with the swinging floating body with a hinge. The floating body provided with the conventional rocking | fluctuation floating body is shown, (a) is a side view, (b) is the figure seen from the arrow F direction of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Floating body, 4a, 4b ... Underwater projecting member, 6 ... Anti-vibration floating body, 7 ... Vertical plate

Claims (2)

  A floating body that floats on the water is provided with a water surface extending member that protrudes outward from the wall surface of the floating body to the wave upper side and wave surface, and is provided outside the water surface extending member and below the bottom surface of the floating body. An apparatus for reducing swaying of a floating body, characterized in that an antiswaying floating body having an extended vertical plate and divided into a plurality of parts in a direction perpendicular to the wave direction is rotatably mounted in the wave direction.   2. The apparatus according to claim 1, wherein the natural periods of the oscillation of the floating body and the reduced floating body are substantially equal.

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