JP2003104284A - Float - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float exhibiting an enhanced vibration damping function having a hollow part and used for giving buoyancy to a structure on the water. SOLUTION: The hollow part is divided into three by providing a buoyancy generation space in the hollow part, and a first water filling space and a second water filling space adjacent to the buoyancy generation space are formed. A first water conveyance hole for conveying and draining water into and from the first water filling space is communicated to the first water filling space, and a first vent hole for conveying and exhausting air into and from the first water filling space is communicated to the first water filling space. A second water conveyance hole for conveying and draining the water into and from the second water filling space is communicated to the second water filling space, and a second vent hole for conveying and exhausting the air into and from the second water filling space is communicated to the second water filling space. The respective water conveyance holes and the respective vent holes are in a size whereby going in and out of the water and the air into and from the first water filling space and the second water filling space is restricted to some degree.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float used for imparting buoyancy to a floating structure such as a floating jetty to levitate it.

[0002]

2. Description of the Related Art Conventionally, in ports, rivers, lakes and marshes,
To moor vessels such as yachts and pleasure boats,
A floating structure such as a floating jetty that is floated on the water is often used.

Such a floating pier is provided with a deck on the upper surface, and a plurality of floats are arranged below the deck, and the float is raised and lowered in accordance with the elevation of the water surface, so that the deck surface is always kept on the water surface. It is designed so that it can be exposed above.

[0004]

However, in the case of such a floating pier, however, the pier receives a navigational wave generated by a person walking or passing by, or a large wave generated by a strong wind, and If the natural period of the and the natural period of the floating pier match, the floating pier will shake violently,
Alternatively, swinging may be sustained for a long time, and there is a problem that the comfort and safety of the floating pier cannot be ensured.

Therefore, the inventor of the present application conducts research to develop a float capable of improving the comfort and safety of a floating structure by making the float itself have a vibration damping function to resist shaking. It was the invention.

[0006]

The float of the present invention is a float having a hollow portion used for imparting buoyancy to a floating structure, and the buoyancy generation space is provided in the hollow portion. The hollow part is divided into three parts by the space,
A first water injection space and a second water injection space that are adjacent to the buoyancy generation space are formed, and the first water injection space has a first water passage hole for passing water into and draining water from the first water injection space. And the first ventilation hole for ventilating and exhausting air into the first water injection space are communicated, and the second water injection space also communicates water into the second water injection space. It is a float in which the second water holes for draining water are communicated with each other, and the second air holes for venting and exhausting air into the second water injection space are communicated with each other.

Further, it is also characterized by the following points. That is, the buoyancy space should be tapered downward in the floating state. The first water passage is provided near the boundary between the first water injection space and the buoyancy generation space, the first ventilation hole is also provided near the boundary between the first water injection space and the buoyancy generation space, and the second water passage is Second
Provided near the boundary between the water injection space and the buoyancy generation space,
The second ventilation hole should also be provided near the boundary between the second water injection space and the buoyancy generation space. Buoyancy material must be installed in the buoyancy space.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the float of the present invention, the inside of a mere hollow float is usually divided into three spaces, that is, a buoyancy generation space, a first water injection space, and a second water injection space. There is something. In particular, by providing a buoyancy generation space in the approximate center of the hollow portion, the hollow portion is divided into a buoyancy generation space, a first water injection space, and a second water injection space. The space and the second water injection space are respectively located on both wings of the buoyancy generation space.

The first water injection space and the second water injection space are
It is desirable to have a symmetrical shape across the buoyancy generation space, and in the cross section of the float formed by a plane that is substantially parallel to the draft surface, not only are the cross-sectional areas of the first water injection space portion and the second water injection space portion equal, , When the cross section is rotated 180 ° with the graphic center of the cross section as the center of rotation,
It is desirable that the cross-sectional shape of the first water injection space and the cross-sectional shape of the second water injection space have rotational symmetry such that they match each other.

Further, the first water injection space is made to communicate with a first water passage hole for water passage and drainage of water into the first water injection space, and at the same time, air is introduced into the first water injection space. The first vent hole for ventilation and exhaust is connected,
The second water injection space is made to communicate with a second water passage hole for water passage and drainage of water into the second water injection space,
A second vent hole for ventilating and exhausting air into the second water injection space is communicated. These water holes and vent holes are set to sizes that limit the flow rates of water and air that flow into and out of the first water injection space and the second water injection space.

Therefore, when the float is floated on the water surface, the float floats in a state of being settled down by its own weight to some extent, and as a result, the first water injection space and the second water injection hole are provided in the first water injection space and the second water injection space. Water will infiltrate through the water holes and will accumulate to the same height as the draft surface.

The amount of water that enters the first and second water injection spaces and the height of the draft surface depend on the size and shape of the buoyancy generation space. In addition, the size and shape of the buoyancy generation space are set so as to be the height of the required draft surface.

The water accumulated in the first water injection space and the second water injection space is almost independent of the water around the float and is not directly affected by the water around the float. When the float tries to move following the movement of water around it, it acts as a resistance and exerts a vibration damping function.

In addition, the amount of water stored in the first water injection space and the second water injection space, and the first water passage hole and the second water passage hole, so that the vibration damping function can be surely exhibited. The sizes of the first ventilation hole and the second ventilation hole are set. Usually, about 1/10 to 1/3 of the volume of the first water injection space and the second water injection space is desirable. However, because the shape of the first water injection space and the second water injection space has an influence on the damping function of the water stored in the first water injection space and the second water injection space, The amount of water stored in the second water injection space depends on the shapes of the first water injection space and the second water injection space, and the sizes of the first water passage hole, the second water passage hole, the first ventilation hole, and the second ventilation hole. The size and shape of the buoyancy generation space are also set according to this.

The float of the present invention is most suitable for use in a floating jetty. The width dimension of the float is set so as to be approximately the same as or slightly smaller than the width dimension of the deck of the floating jetty, and the extension direction of the deck is also set. And float first
The floats are arranged along the deck so that the extending directions of the water injection space and the second water injection space are substantially parallel to each other.

By arranging the float in this manner, the swing of the deck in the extension direction, that is, the pitching of the deck is suppressed by the rigidity of the deck itself, while the swing of the deck in the width direction, that is, the rolling of the deck. Will be controlled by the first and second water injection spaces, and it will be a floating jetty with very little shaking.

That is, when rolling occurs in the deck and the float, one of the first water injection space and the second water injection space, which is the first water injection space here for convenience of explanation,
The first water injection space portion is in a state of being relatively floated above the draft surface, and the other second water injection space portion is in a state of being relatively submerged from the water draft surface, as compared with the time of non-rolling.

Then, after a predetermined time, the reverse state occurs,
When the first water injection space part floats above the draft surface, the buoyancy acting on the first water injection space part decreases, and
Due to the weight of the water in the water injection space, a force that pushes it down is relatively generated in the first water injection space portion, which opposes the rolling motion.

On the other hand, when the second water injection space portion is sunk from the draft surface, the buoyancy acting on the second water injection space portion becomes relatively large, so that the second water injection space portion will be pushed upward. The force to move is generated relatively, and resists the movement of rolling.

In this way, the forces against the movement of the rolling act on the first water injection space and the second water injection space, respectively, so that the rocking due to the rolling can be damped as much as possible. Is. In particular, since no movable part is provided and only water existing in the surroundings is used, the cost is low and maintenance-free, and the maintenance cost is also low. It can be greatly reduced.

In order to enhance the damping function against rolling as described above, the first water injection space and the second water injection space must be independent of each other. Further, by making the first water injection space and the second water injection space independent of each other, the occurrence of the rocking of the float due to the motion of water respectively generated in the first water injection space and the second water injection space The water injection space and the second water injection space can cancel each other out, and the effect of suppressing the occurrence of rocking can also be obtained.

Further, in the float according to the present invention, the buoyancy space is tapered downward in the floating state. As a result, in the float of the present invention, the buoyancy does not increase at a constant rate as the float sinks, but the buoyancy can be increased as much as the float sinks. As a result, the following effects can be obtained.

For example, when a deck is arranged on the float to form a floating pier and a load is applied to the float from above by a person passing on the deck, the float tries to sink by the load. .

At this time, since the draft surface rises as the float sinks, water newly invades into the first water injection space and the second water injection space from the first water passage hole and the second water passage hole, respectively. Then, it tries to raise the water level of the water stored in the first water injection space and the second water injection space to the draft surface.
Along with this, the air located above the first water injection space and the second water injection space is discharged from the first ventilation hole and the second ventilation hole, respectively, as water enters.

First in the first water injection space and in the second water injection space
When water gradually invades from the water passage hole and the second water passage hole, buoyancy decreases by replacing the part that was air until now with water, but with the sinking of the float the draft surface of the buoyancy generation space. The buoyancy is increased due to the increase of the lower volume, and the increase and decrease of these buoyancy are balanced, and the float floats in a state of being settled by a required amount.

As described above, since the portion that was air is replaced by water, the buoyancy is relatively gradually decreased immediately after the load is applied, so that the float can be gradually settled and the load is increased. It is possible to suppress an increase in the vertical swing of the float caused by the addition of the force, and it is possible to quickly attenuate the float.

On the other hand, on the contrary, when the load acting on the float is removed, a large amount of vertical movement is caused by attempting to levitate with a normal float, but in the case of the float of the present invention. , Although it starts to float when the load is removed, it is possible to suppress the fact that the floating force is weakened due to the presence of water in the first water injection space and the second water injection space, causing a large vertical movement of the float. You can

In addition, when the float rises with the removal of the load, the draft surface lowers, and with the drop of the draft surface, the water in the first water injection space and the water in the second water injection space becomes 2 The water is gradually drained from the water passage, and at that time,
From the first vent hole and the second vent hole to the first water injection space and the second
Air is sent into the water injection space.

Since the float floats as the water is drained from the first water injection space and the second water injection space, the float can be floated relatively slowly, and a large vertical movement is generated in the float. Can be suppressed.

As described above, the buoyancy space is tapered downward in the floating state, so that a load is applied to the float, or
The vertical swing of the float that occurs when the load is removed from the float can be quickly attenuated and stabilized.

In particular, the first water passage is provided near the boundary between the first water injection space and the buoyancy generation space, and the first ventilation hole is also provided near the boundary between the first water injection space and the buoyancy generation space.
The second water passage hole is provided near the boundary between the second water injection space and the buoyancy generation space, and the second ventilation hole is also provided near the boundary between the second water injection space and the buoyancy generation space. The 2 water holes can always be in contact with water, while the first ventilation hole and the second ventilation hole can be always in contact with the atmosphere, and the first water injection space and the second water injection space Water can be surely injected and discharged into the water, and the water injection speed and the water discharge speed can be adjusted by the number of the first water passage holes and the second water passage holes and the opening area. .

In the buoyancy generating space, a buoyant material, such as urethane foam or styrofoam, which tends to generate a large buoyancy because of its low specific gravity is arranged. That is, by arranging the buoyancy material in the buoyancy generation space, it is possible to prevent the buoyancy generated by the accumulation of water in the buoyancy generation space from decreasing. When the buoyancy member is not provided, the buoyancy generation space is an empty closed space so that buoyancy can be generated.

Embodiments of the present invention will be described below with reference to the drawings. The floats of the embodiments described below are all floats used for floating piers.
However, it can be used for other purposes.
When it is used for other purposes, it may have an external shape suitable for the purpose.

[0034]

Embodiments (First Embodiment) FIG. 1 is a float of the first embodiment.
2 is a perspective view of F1, FIG. 2 is a cross-sectional view taken along line X1-X1 of FIG.
FIG. 3 is a partially cutaway perspective view of the float F1 of the first embodiment.

The float F1 has a substantially rectangular upper surface 11a, a lower surface 11b, a front surface 11c, a rear surface 11d, and a left side surface 11 respectively.
It is a hollow substantially rectangular body surrounded by e and the right side surface 11f. In particular, the upper surface 11a and the lower surface 11b are made to be substantially parallel to the horizontal plane when floated on the water surface. Further, in this embodiment, the upper surface 11a and the lower surface 11b are substantially rectangular.

When constructing a floating jetty, the front surface 11c and the rear surface 11d of each float F1 are arranged side by side so as to face each other, and a deck (not shown) is provided on the top surface 11a of the floats F1 arranged. It is made a floating pier by arranging. The distance between the left side surface 11e and the right side surface 11f is set to be substantially equal to the width dimension of the deck.

In the present embodiment, the float F1 is an FRP box made of FRP. However, the float F1 is not limited to the FRP and may be made of a combination of concrete, wooden and plastic plate materials.

The inside of the float F1 has a first separating wall 12 and a second separating wall.
It is divided into three by arranging the separation wall 13 and
A space sandwiched between the separation wall 12 and the second separation wall 13 is used as a buoyancy generation space 14. Further, the space adjacent to the first separation wall 12 side of the buoyancy generation space 14 is referred to as a first water injection space 15, and the space adjacent to the buoyancy generation space 14 to the first separation wall 12 side is referred to as a second water injection space 16.

That is, the buoyancy generation space 14 and the first water injection space
15 and the second water injection space 16 are substantially parallel to the extension direction of the deck, and the first water injection space 15 and the second water injection space 16 are located on both wings of the buoyancy generation space 14.
That is, the buoyancy generation space 14 makes the first water injection space 15 and the second water injection space 16 in a non-communication state.

In the present embodiment, the first separation wall 12 and the second separation wall 13 have their end portions on the upper surface 11a side positioned at the end portions of the same upper surface 11a, as shown in the sectional view of FIG. Lower surface 11b
The side is located closer to the inside of the float F1 than the end of the lower surface 11b, and the buoyancy generation space 14 has an inverted trapezoidal shape. That is, the buoyancy generation space 14 is tapered downward in the levitation state.

Particularly, the distance between the left side surface 11e and the right side surface 11f is H
Then, the lower surfaces 11b of the first and second separation walls 12 and 13
The end on the side is at a position that is about 10% of H, that is, about 0.1 × H inward from the end of the lower surface 11b.

A plurality of first water passage holes 15a are provided in the lower surface 11b surrounding the first water injection space 15 near the first separation wall 12, and a plurality of first water holes 15a are provided at the upper end of the left side surface 11e surrounding the first water injection space 15. The first ventilation hole 15b is provided so that water can be passed through and drained into the first water injection space 15 through the first water passage hole 15a. The first separation wall 12 is a boundary between the buoyancy generation space 14 and the first water injection space 15, and the first ventilation hole 15b is near the first separation wall 12.

Similarly, a plurality of second water passage holes 16a are provided in the lower surface 11b surrounding the second water injection space 16 in the vicinity of the second separation wall 13, and at the upper end of the right side surface 11f surrounding the second water injection space 16. A plurality of second ventilation holes 16b are provided so that water and water can be discharged into the second water injection space 16 through the second water holes 16a. The second separation wall 13 is a boundary between the buoyancy generation space 14 and the second water injection space 16, and the second ventilation hole 16b is near the second separation wall 13.

Further, in this embodiment, the styrofoam 17 is arranged in the buoyancy generation space 14. In addition, by forming the styrofoam 17 in an inverted trapezoidal shape in advance and disposing the styrofoam 17 in the inner space of the float F1, the first water injection space without providing the first separation wall 12 and the second separation wall 13. You may make it form 15 and the 2nd water injection space 16. Further, instead of the Styrofoam 17, other buoyancy material may be used.

When the width of the floating pier deck is large, the float F1 also increases accordingly.
It may be difficult to transport the float F1 itself. Therefore, as shown in FIG. 4, a left float F1-1 and a right float F1-2, each of which has a shape obtained by dividing the left side face 11e and the right side face 11f into two parts, may be provided in pairs.

In this case, by arranging the left float F1-1 along the left end of the deck and the right float F1-2 along the right end of the deck, the integral float F1
The same effect as can be obtained.

(Second Embodiment) FIG. 5 is a perspective view of a float F2 of the second embodiment, and FIG. 6 is a sectional view taken along line X2--X2 of FIG. The float F2 of the second embodiment has a substantially columnar outer shape of the float F1 of the first embodiment, which has a substantially rectangular shape.

That is, the float F2 has a substantially circular upper surface 21a, a lower surface 21b, an upper surface 21a and a lower surface 21b.
It is a hollow substantially circular column surrounded by a peripheral surface 21c connecting with. The upper surface 21a and the lower surface 21b are arranged to be substantially parallel to the horizontal plane when floated on the water surface.

Then, as in the case of the first embodiment, by arranging the first separating wall 22 and the second separating wall 23 inside the float F2, the hollow part of the float F2 is divided into three parts. A buoyancy generation space is a space sandwiched between the first separation wall 22 and the second separation wall 23.
I am going to set it to 24. In addition, the first of the buoyancy space 24
The space adjacent to the separation wall 22 side is the first water injection space 25, and the space adjacent to the buoyancy generation space 24 on the first separation wall 22 side is the second water injection space 26. In particular, as shown in the sectional view in FIG.
The first separation wall 22 and the second separation wall 23 are arranged so that the buoyancy generation space 24 is tapered downward in the floating state.

Furthermore, a plurality of first water passage holes 25a are provided near the first separation wall 22 on the lower surface 21b surrounding the first water injection space 25, and the first separation wall on the upper surface 21a which surrounds the first water injection space 25. A first ventilation hole 25b is provided in the vicinity of 22, and the first ventilation hole 25a is provided through the first water passage hole 25a.
Water is allowed to flow and drain into the water injection space 25.

Similarly, a plurality of second water passage holes 26a are provided in the lower surface 21b surrounding the second water injection space 26 in the vicinity of the second separation wall 23, and the second separation of the upper surface 21a surrounding the second water injection space 26 is performed. A second ventilation hole 26b is provided near the wall 23, and a second ventilation hole 26a
Water is allowed to flow and drain into the water injection space 26.

Reference numeral 27 in FIG. 6 denotes a styrofoam provided in the buoyancy generation space 24. Similar to the case of the first embodiment,
A buoyancy material other than the polystyrene foam 27 may be used.

(Third Embodiment) FIG. 7 is a perspective view of a float F3 of the third embodiment, and FIG. 8 is a sectional view taken along line X3-X3 of FIG. The float F3 of the third embodiment is an embodiment of the float of the present invention in which the buoyancy generation space is maximized to support a heavy object.
In order to facilitate comparison with the case of the first embodiment, the outer shape of the float F3 of the third embodiment is the same as that of the float F3 of the first embodiment.
Matched to the outer shape of F1.

That is, like the float F1 of the first embodiment, the float F3 of the third embodiment has a substantially rectangular upper surface 31a, a lower surface 31b, a front surface 31c, a rear surface 31d, and a left side surface 31e. And a right side surface 31f to form a hollow substantially rectangular body.

Also in this embodiment, the float F3
By arranging the first separating wall 32 and the second separating wall 33 inside, the hollow part of the float F3 is divided into three, and the first separating wall 32
A space sandwiched between the second separation wall 33 and the second separation wall 33 is defined as a buoyancy generation space 34. In addition, the space adjacent to the first separation wall 32 side of the buoyancy generation space 34 is referred to as a first water injection space 35, and the first buoyancy generation space 34
The space adjacent to the separation wall 32 side is the second water injection space 36.

Further, in the case of this embodiment, as shown in FIG. 8, the upper end of the first separating wall 32 is brought into contact with the left side surface 31e, and in particular, the height dimension of the float F3 is T. At this time, the upper end of the first separation wall 32 contacts the left side surface 31e at a position where the height from the lower surface 31b is 0.4 × T.

The lower end of the first separating wall 32 has a lower surface 31b.
In particular, when the width dimension of the float F3 is H, the lower end of the first separating wall 32 is a lower surface at a position inside by 0.05 × H from the end of the lower surface 31b. It makes contact with 31b.

Similarly, the upper end of the second separating wall 33 is the right side surface.
When the height of the float F3 is T, the upper end portion of the second separation wall 33 has the right end at the position where the height from the lower surface 31b is 0.4 × T. Face 31
It makes contact with f.

The lower end of the second separating wall 33 has a lower surface 31b.
In particular, when the width dimension of the float F3 is H, the lower end of the first separating wall 32 is located at a position inside by 0.05 × H from the end of the lower surface 31b.
It makes contact with b.

This is the shape of the first water injection space 35 and the second water injection space 36 when the buoyancy generation space 34 is maximized. Even in this case, the buoyancy generation space 34 faces downward in the floating state. It is designed to be tapered.

Further, a plurality of first water passage holes 35a are provided in the lower surface 31b surrounding the first water injection space 35 in the vicinity of the first separation wall 32, and the first left side surface 31e of the left side surface 31e which surrounds the first water injection space 35 is formed. A first vent hole 35b is provided in the vicinity of the separation wall 32 so that water can be passed through and drained into the first water injection space 35 through the first water passage hole 35a.

Similarly, a plurality of second water passage holes 36a are provided in the lower surface 31b surrounding the second water injection space 36 in the vicinity of the second separation wall 33, and the second right side surface 31f surrounding the second water injection space 36 is provided with a second A second ventilation hole 36b is provided in the vicinity of the separation wall 33 so that water can be passed through and drained into the second water injection space 36 through the second water passage hole 36a.

Reference numeral 37 in FIG. 8 is also Styrofoam provided in the buoyancy generation space 34. Similar to the case of the first embodiment,
A buoyancy material other than the polystyrene foam 37 may be used.

(Fourth Embodiment) FIG. 9 is a perspective view of a float F4 of the fourth embodiment, and FIG. 10 is a sectional view taken along line X4-X4 of FIG. FIG. 11 is a use state reference diagram. The float F4 of the fourth embodiment is the float of the present invention, which has a high ability to suppress the above-mentioned rolling.

In order to further suppress the rolling, the first water injection space and the second water injection space are compared with the buoyancy generation space.
It is desirable to increase the volume of the water injection space, and the fourth embodiment shows a float F4 having a buoyancy generation space shape, a first water injection space shape, and a second water injection space shape having the highest ability to suppress rolling. There is something.

Like the float F1 of the first embodiment, the float F4 of the fourth embodiment has a substantially rectangular upper surface 41a.
A lower surface 41b, a front surface 41c, a rear surface 41d, a left side surface 41e,
It is a hollow substantially rectangular body surrounded by the right side surface 41f. The upper surface 41a and the lower surface 41b are arranged to be substantially parallel to the horizontal plane when floated on the water surface.

Also in this embodiment, the float F4
By arranging the first separation wall 42 and the second separation wall 43 inside, the hollow part of the float F4 is divided into three, and the first separation wall 42
A space sandwiched between the second separation wall 43 and the second separation wall 43 is defined as a buoyancy generation space 44. Further, the space adjacent to the first separation wall 42 side of the buoyancy generation space 44 is referred to as a first water injection space 45, and the first buoyancy generation space 44
The space adjacent to the separation wall 42 side is defined as the second water injection space 46.

Further, as shown in FIG. 10, the first separating wall
The upper end of 42 is made to contact the upper surface 41a,
In particular, when the width dimension of the float F4 is H, the upper end of the first separation wall 42 is in contact with the upper surface 41a at a position inside by 0.35 × H from the end of the upper surface 41a.

The lower end of the first separating wall 42 is the lower surface 41b.
In particular, when the width dimension of the float F3 is H, the lower end of the first separation wall 42 is the lower surface at a position inside 0.475 × H from the end of the lower surface 41b. It makes contact with 41b.

Similarly, the upper end of the second separating wall 43 is the upper surface 41.
In particular, when the width dimension of the float F4 is set to H, the upper end of the second separation wall 43 is located at the position inside 0.35 × H from the end of the upper surface 41a.
It makes contact with 41a.

The lower end of the second separating wall 43 is the lower surface 41b.
In particular, when the width dimension of the float F4 is H, the lower end of the second separation wall 43 is the lower surface at a position inside by 0.475 × H from the end of the lower surface 41b. It makes contact with 41b.

This is the buoyancy generation space 44, the first water injection space 45, and the second water injection space that have the highest ability to suppress rolling.
46 shape, even in this case, buoyancy space 44
However, in the levitated state, it is tapered downward.

Further, a plurality of first water passage holes 45a are provided near the first separation wall 42 on the lower surface 41b surrounding the first water injection space 45, and the first separation wall on the upper surface 41a which surrounds the first water injection space 45. A first ventilation hole 45b is provided in the vicinity of 42, and the first ventilation hole 45a is provided through the first water passage hole 45a.
Water can be passed and drained into the water injection space 45.

Similarly, a plurality of second water passage holes 46a are provided in the lower surface 41b surrounding the second water injection space 46 in the vicinity of the second separation wall 43, and the second separation of the upper surface 41a surrounding the second water injection space 46 is performed. A second ventilation hole 46b is provided in the vicinity of the wall 43, and the second ventilation hole 46a is provided through the second water passage hole 46a.
Water can be passed and drained into the water injection space 46.

Reference numeral 47 in FIG. 8 is also Styrofoam provided in the buoyancy generation space 44. Similar to the case of the first embodiment,
A buoyancy material other than the polystyrene foam 47 may be used.

The above-mentioned floats F1, F2, F3 and F4 are not only used individually, but as shown by using the float F4 of the fourth embodiment in FIG. They may be combined and used as the synthetic float f.

In this case, the floats F1, F2, F3, F4 of the present invention
If the width is 30% or more of the entire float, the above vibration damping function can be sufficiently exerted. That is, FIG.
As shown in 1, when the width of the synthetic float f is L,
The width of the float F1, F2, F3, F4 portion of the present invention may be 0.3 × L or more.

The buoyancy generation space, the first water injection space, the second
The shape of the water injection space is not limited to the shapes of the first embodiment, the third embodiment, and the fourth embodiment, and the fourth embodiment described above is used.
It may be any shape between the shape of the float F4 of the embodiment and the shape of the float F3 of the third embodiment. However, in any case, the buoyancy space must be tapered downward in the levitated state.

[0079]

According to the first aspect of the present invention, the buoyancy generating space is provided in the hollow portion to divide the hollow portion into three parts, and the first water injection space adjacent to the buoyancy generating space is provided. A second water injection space is formed, and a first water injection space is
The first water passage for communicating and draining water into the first water injection space is communicated with, and the first air hole for performing ventilation and exhaust of air into the first water injection space is provided. The second water injection space is communicated with the second water injection hole for communicating water into and out of the second water injection space, and the air is vented into the second water injection space. By connecting the second ventilation hole for exhausting air, when the float is floated on water, it is possible to obtain a damping effect by the water that has entered the first water injection space and the second water injection space, It is possible to provide a float that has less shaking and can quickly damp shaking even if shaking occurs.

According to the second aspect of the present invention, the buoyancy generation space is tapered downward in the floating state, so that when the load is applied to the float or the float is acted on. The vertical swing of the float that occurs when the existing load is removed can be quickly attenuated.

According to the third aspect of the present invention, the first water passage is provided near the boundary between the first water injection space and the buoyancy generation space, and the first ventilation hole is also formed at the boundary between the first water injection space and the buoyancy generation space. The second water passage is provided near the boundary between the second water injection space and the buoyancy generation space, and the second ventilation hole is also provided near the boundary between the second water injection space and the buoyancy generation space. , Can be performed while limiting the inflow of water into the first water injection space and the second water injection space and the outflow of water from the first water injection space and the second water injection space to some extent,
It is possible to prevent the effect of dampening the swing accompanying the movement of water from being hindered.

According to the invention described in claim 4, since the buoyancy material is arranged in the buoyancy generation space, it is possible to prevent the infiltration of water into the buoyancy generation space and the reduction of the accumulated buoyancy. Therefore, it is possible to always obtain reliable buoyancy.

[Brief description of drawings]

FIG. 1 is a perspective view of a float according to a first embodiment.

FIG. 2 is a sectional view taken along line X1-X1 of FIG.

FIG. 3 is a partially cutaway perspective view of the float of the first embodiment.

FIG. 4 is a perspective view showing another embodiment of the float according to the first embodiment.

FIG. 5 is a perspective view of a float according to a second embodiment.

FIG. 6 is a sectional view taken along line X2-X2 of FIG.

FIG. 7 is a perspective view of a float according to a third embodiment.

8 is a sectional view taken along line X3-X3 of FIG.

FIG. 9 is a perspective view of a float according to a fourth embodiment.

10 is a cross-sectional view taken along line X4-X4 of FIG.

FIG. 11 is a reference diagram showing a usage state of the float of the fourth embodiment.

[Explanation of symbols]

F1, F2, F3, F4 float 11a, 21a, 31a, 41a Top surface 11b, 21b, 31b, 41b bottom surface 11c, 31c, 41c front 11d, 31d, 41d rear 11e, 31e, 41e Left side 11f, 31f, 41f Right side 12,22,32,42 1st separation wall 13,23,33,43 Second separation wall 14,24,34,44 Buoyancy space 15,25,35.45 First water injection space 16,26,36,46 Second water injection space 15a, 25a, 35a, 45a 1st water passage hole 15b, 25b, 35b, 45b 1st ventilation hole 16a, 26a, 36a, 46a Second water passage hole 16b, 26b, 36b, 46b 2nd ventilation hole 17,27,37,47 Styrofoam

Claims (4)

[Claims] 1. A float having a hollow portion used for imparting buoyancy to a floating structure, wherein a buoyancy generation space is provided in the hollow portion to divide the hollow portion into three parts, and the buoyancy A first water-filling space and a second water-filling space adjacent to the occurrence space are formed, and a first water-filling hole is provided in the first water-filling space for passing water into and draining the first water-filling space. While communicating
The first ventilation hole for ventilating and exhausting air into the first water injection space is communicated with the second water injection space, and the second water injection space is also provided with water passage and drainage. While communicating the second water passage,
A float characterized in that a second vent hole for ventilating and exhausting air into the second water injection space is communicated. 2. The float according to claim 1, wherein the buoyancy space is tapered downward in a floating state. 3. The first water passage is provided near the boundary between the first water injection space and the buoyancy generation space, and the first ventilation hole is also provided near the boundary between the first water injection space and the buoyancy generation space. The water passage hole is provided near the boundary between the second water injection space and the buoyancy generation space, and the second ventilation hole is also provided near the boundary between the second water injection space and the buoyancy generation space. The float according to Item 2. 4. The float according to claim 1, wherein a buoyant material is arranged in the buoyancy generation space.