JP3366563B2 - Buoyancy adjustable float - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buoyancy adjusting type float which is particularly suitable as an additional float for an oyster raft.

[0002]

2. Description of the Related Art Conventionally, when oysters are cultivated, a wire having a large number of shells to which juveniles are attached is suspended from the rafts in the sea. FIG. 4 and FIG. 5 show an oyster raft 1 having a conventional structure, which has a diameter of about 10 cm and a length of about 10 m.
It is often made by assembling a and 2b with a wire (not shown) or the like in a lattice shape. That is, 40 to 50 horizontal bamboos 2a are arranged at an interval of about 45 cm, and moso bamboo 2b for pressing is arranged at an interval of about 3 m, and the float 3 is fixed by connecting them with a wire or the like. Then, from a space formed between the horizontal bamboo 2a and the pressing bamboo 2b, a wire 5 having a large number of fixed shells 4, 4, ... With oyster fry (not shown) attached is suspended in the sea.

Usually, at the beginning of aquaculture, the adhesion of juveniles to the shell 4 is weak, and when the raft 1 shakes due to waves, tides, etc.,
This juvenile may be shaken off the shell 4. Therefore, it is desirable that the raft 1 be as stationary as possible at this time, and the freeboard is set low.

However, since the oyster becomes heavier as it grows, the buoyancy as it is becomes insufficient, and it is necessary to increase the float on the way. As a method therefor, conventionally, a method has been adopted in which the raft 1 is lifted up by a crane and the float is inserted below the raft 1 and the float is inserted. As the float, a float made of Styrofoam and having a certain buoyancy is generally used.

A float having a floating structure is also known as a float for fishing nets, cages, piers, etc.
No. 49). In this publication, a water inlet / outlet is provided in the float, seawater is injected into the float, and the buoyancy is adjusted according to the amount, and a structure in which a pipe is formed in a protruding shape at the water inlet / outlet is disclosed. There is.

[0006]

In the method of lifting one end of the raft with the crane and inserting the float into the lower surface of the raft as described above, a large bending force is applied to the frame of the raft (usually made by connecting Moso bamboo with wires). There is a risk that this will be broken or the shape of the entire frame will be deformed due to the addition of force. There is also a problem that the work is large-scale and troublesome.

On the other hand, it is also possible to use the float-sink structure float disclosed in the above publication and move the float to the lower part of the raft while reducing the buoyancy to increase the buoyancy at a predetermined position and tie it to the float.

However, since this kind of additional float may be rolled or thrown during transportation or mounting on a raft, if the float has a protrusion, it may be damaged. Therefore, it is not preferable to provide the water inlet / outlet with a tubular protrusion structure or to provide a protrusion portion on the float as disclosed in the above publication.

The present invention has been made in view of the above points, and an object of the present invention is to provide a buoyancy-adjustable float having a structure that is unlikely to be damaged even if it is rolled or thrown down.

[0010]

A buoyancy adjusting type float according to a first aspect of the present invention is formed on a float main body composed of a cylindrical hollow body whose both end faces are swollen, and a circumferential surface of the float main body. A supply / exhaust valve installed in the recess so as not to extend outside the circumferential surface, and a water supply / drainage opening formed in the float circumferential surface at a position opposite to the recess, A mooring hole formed at a position recessed from the surface at the valve-side end of the float body.

In the float having such a structure, the movement is performed by rolling. At that time, since the float is a hollow cylindrical body and has no protrusion, it is easy to roll.
Also, since the valve is installed in the recess, even if you roll the float, it is unlikely that it will collide with other objects,
There is little risk of damage.

According to a second aspect of the buoyancy adjusting type float, the buoyancy adjusting type float is used as an additional float for an rafting raft. When installing it, connect the air supply and exhaust tube to the valve, first open the valve and exhaust it, inject seawater into the float body from the water supply and drainage opening, move it in the sea with almost zero buoyancy, and place it at the specified location on the raft frame. Located below. Next, air is supplied from the valve, and seawater in the float body is drained from the water supply / drain opening to increase buoyancy. Then, when a predetermined buoyancy is reached, the valve is tightened, a wire or the like is passed through the mooring hole, and fixed to the raft frame. Then remove the tube from the valve. At this time, since the mooring hole and the valve are located at the same position in the longitudinal direction of the float, when mooring the mooring hole as the upper side, the valve is on the upper side and opening and closing operations are easy, and the water supply / drainage opening is on the lower side. Outflow of air inside is blocked.

In the buoyancy-adjustable float according to the third aspect of the invention, the float body is made of a polyolefin thermoplastic resin. Since this polyolefin-based thermoplastic resin is chemically extremely stable, its durability is maintained even when it is exposed to sunlight or immersed in the sea for a long time, and adhesion of marine organisms such as shells and seaweeds is suppressed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 10 denotes a float body composed of a hollow cylindrical body whose both end faces are bulged in an arcuate cross section, and is made of a polyolefin thermoplastic resin such as polyethylene (PE) resin. It 11, 11,
A groove formed circumferentially at an appropriate interval in the middle of the cylindrical body portion serves to reinforce the shape of the float main body 10 and to pass a wire when fixing it to the frame of the raft.

Here, the float body 10 is manufactured by rotational molding. That is, the PE resin was put into a pair of molds having a cavity of the shape of the float body 10, the mold was heated to melt the resin, and the mold was rotated to form a PE resin layer having a constant thickness on the inner surface of the cavity. After that, it is naturally cooled and further cooled with cooling water, and the mold is divided to take out the float body 10 as a molded product.

Reference numeral 12 is a recess formed in the circumferential surface of the float body 10 and has a slanted side wall 13. Reference numeral 14 is a valve formed substantially vertically on the side wall 13 of the recess 12,
It is connected to a detachable air tube (not shown) and controls opening and closing of supply and exhaust of air sent through an air compressor (not shown). This valve 14
The position and the size of the valve 14 are set so as not to protrude from the circumferential surface of the cylindrical body.

Numeral 15 is a position on the circumferential surface of the float body 10 opposite to the recess 12, that is, the recess 12
When the position of the valve 14 and the position of the valve 14 are upward, the water supply / drainage opening is formed on the lower side. The opening 15 is positioned so as to be displaced toward either one of the end portions. The opening 15 is provided at such a shifted position in order to facilitate the outflow of water inside when the float is raised to the land. That is, if the float body 10 is inclined so that the opening 15 side is downward, drainage is facilitated.

Reference numeral 16 denotes a valve 1 of the float body 10.
In the pair of recesses formed on the same side as the side where 4 is located, that is, on the upper end portion, holes are bored in the side walls of the recesses 16, 16 which face each other, and the pipe 17 is inserted through these holes. And glued and fixed. A mooring hole 18 is formed by this pipe 17. By closing the hole with the pipe 17,
The watertightness of the float body 10 in this portion is maintained.

Here, as an example of the dimensions of the float body 10, the diameter of the cylindrical body is 75 cm, the height is 130 cm,
The width of the groove 11 is 3 cm, the depth is 2 cm, the interval is 74 cm, the curvature of the end bulging surface is 75 cm, the wall thickness is 6 cm, and the depth of the recess 12 is 9 c.
m, the diameter of the water supply / drainage opening 15 (circular) is 10 cm, the length of the pipe 17 is 15 cm, and the inner diameter of the mooring hole 18 can be 2.5 cm.

Now, the method of using the float of the present invention having the above-mentioned structure will be described. In the float, first, the valve 14 is opened while floating on the sea surface, and the float main body 1
The buoyancy is reduced by inflowing seawater into 0. In this state, as shown in FIG. 3, it is moved below the raft frame (Moso bamboo) 19. This movement is performed by the worker at the mooring hole 1
This is done by pulling this through a rope 20 on the 8.

Then, after moving to a predetermined position of the frame 19, the rope 20 is connected to the frame 19, a tube (not shown) is connected to the valve 4, the valve 14 is opened, and the air from the compressor is floated. 10 is supplied. When the buoyancy of the float body 10 increases and the upper portion thereof comes into contact with the frame 19, the wire 21 is wound around the groove 11 to firmly fix the float body 10 to the frame 19. After that, air is further sent into the float body 10 to increase its buoyancy. When the buoyancy reaches a predetermined value, the valve 4 is closed and the tube is removed.

Thus, the installation of one additional float is completed, and the required number of floats are installed in the same manner.
Thereafter, the adjustment of the buoyancy of the float is increased or decreased as necessary. In this case, since the raft usually sinks as the oyster grows, air is supplied to the float to increase its buoyancy. In addition, when waves occur on the sea surface such as a typhoon, you can take measures to suppress the sway of the raft by removing the air from the float and lowering the freeboard.

[0024]

As described above, according to the first aspect of the present invention.
According to this, since the valve and the water supply / drainage opening are provided in the float body, the buoyancy can be adjusted by increasing or decreasing the amount of air in the float body after the float body is installed on the sea surface.

According to the invention, the float body is
It consists of a hollow cylindrical body with bulging both end surfaces, the valve is housed in a recess formed in the float body so that it does not protrude outward, and the mooring hole is formed in a position recessed from the surface. Body surface There are no corners or protrusions on the body. Therefore, the float can be rolled and can be easily handled during transportation or installation. That is, even if the float is rolled, there is almost no danger of the valve colliding with an external object, and even if it is handled roughly, such as throwing it down, there will be no accident that the corner is chipped or the projection is broken, It rarely receives fatal damage such as breakage. Therefore, the structure can be strong against external impact.

Further, according to the present invention, since the valve and the mooring hole are located on the same side on the surface of the float body, when the mooring hole is faced up and connected to the frame of the raft, the valve is also positioned above. It will be easier to open and close.

According to claim 2 of the present invention, when the weight applied to the raft is different between the beginning and the end of the aquaculture, such as the oyster farming raft (the weight gradually increases in the case of oysters), Effective as a float.

Further, according to claim 3 of the present invention, the use of the olefinic thermoplastic resin as the material of the float body does not impair the durability even when it is floated on the sea surface for a long time. Also, the adhesion of marine organisms such as shells is suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view of a buoyancy adjustment type float according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing a state in which a float is fixed to a raft.

FIG. 4 is a perspective view showing a general structure of an oyster raft.

FIG. 5 is a side view showing a general structure of an oyster raft.

[Explanation of symbols] 1 raft raft 2a, 2b Moso bamboo 3 floats 4 shells 10 float body 11 grooves 12 recess 13 Side wall 14 valves 15 Water supply and drainage opening 16 recess 17 Pipe 18 Mooring hole 19 frames 20 rope 21 wires

Front Page Continuation (72) Inventor Shinji Fujimoto 1-8 Yokogawa Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Morten Co., Ltd. (56) Reference JP-A-52-16399 (JP, A) JP-A-7-123883 (JP, A) S. 47-31356 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01K 61/00 A01K 75/04 B63B 22/00

Claims (3)

(57) [Claims] 1. A float main body made of a cylindrical hollow body whose both end surfaces are bulged, and a float main body which is installed in a recess formed in the circumferential surface of the float main body so as not to protrude outside the circumferential surface. A water supply / exhaust valve, a water supply / drainage opening formed in the float circumferential surface at a position opposite to the recess, and formed at a position recessed from the surface at the valve side end of the float body. Buoyancy adjustable float with a mooring hole. 2. The buoyancy adjusting float according to claim 1, wherein the buoyancy adjusting float is used as an additional float for an oyster raft. 3. The buoyancy adjusting type float according to claim 1 or 2, wherein the float body is made of a polyolefin thermoplastic resin.