KR20110004024U - Assembling type Buoy - Google Patents

Abstract

The present invention relates to an assembled buoy, in detail, the assembled buoy is a buoyancy buoy, a buoyancy portion having an air layer filled with air therein and a coupling groove of the coupling body on the outer surface of the buoyancy portion. Unit body having a coupling projection to be inserted, the coupling body of the unit body is inserted, the coupling body having a coupling groove, consisting of a fastening means for fastening the unit body and the coupling body, the coupling protrusion in the unit body The assembly is characterized in that the air is inserted into the coupling groove in the coupling body, the unit body is completed by being coupled to the coupling body by the fastening means.

      Assembled type, Sphere, Unit body, Coupling, Coupling body, Fastening means

Description

Assembling type Buoy}

The present invention relates to an assembled float.

In general, floats are floats on the surface of the water. Also called buoy or buoy. The floats are used in positions to direct the course to help the ship navigate safely. Buoys are also used to warn of the presence of nautical hazards, such as reefs and sinking ships. In addition, floats are also used to indicate the location of objects in water, such as fishing gear and anchors. In addition, the ball is used to fix the net installed in a certain range to fish, waste and algae.

These buoys are buoyant to float on the sea, and they are fixed to the bottom of the seabed or a heavy load that can be fixed by means of an instrument that can be suspended. Dangling instruments include chains and wires.

Flags may be installed on the floats to identify them. In addition, the sub-ball may be provided with a variety of transmission and reception objects that can be identified by an electronic signal, and may be provided with an equalizing device that emits light so that it can be identified at night.

The general sphere is made of a foamed resin material obtained by foam molding a synthetic resin. The foamed resin material generates voids due to the gas introduced during the foaming of the synthetic resin. The foamed resin with voids thus generated has a buoyancy which can float on water. These foamed resins are buoyant due to internal voids and do not require a space for air storage. In addition, even if the foamed resin is partially damaged, there is an advantage that the buoyancy is generated in the remaining portion does not buried in the water.

However, the foamed resin is weak in strength because voids are formed therein. In other words, when the external impact of the foamed resin is transmitted, the impact propagates between the pores of the foamed resin and is easily broken. Therefore, the ball | bowl using the foamed resin with weak strength is short in time of replacement.

In addition, a buoy formed of a foamed resin floating in the sea is partially broken by waves. The foamed resin has voids in the interior, so that the binding force between internal tissues is poor. As a result, the waves hitting the float side continuously erode the foamed resin having a weak binding force. Foamed resins that fall off by erosion pollute the sea. In addition, the erosion-rich buoyancy is reduced buoyancy can not float in the water. Therefore, the replacement should be frequent.

In recent years, the conventional mouth is made of a synthetic resin material in which air is injected into the interior using a blow molding method. The conventional mouthpiece is manufactured integrally with the synthetic resin material in the state in which air is injected by the blow molding machine. The conventional buoys manufactured integrally have buoyancy by air filled therein. Compared with the foamed resin material, the conventional ball has a strong strength and does not cause erosion, and thus has a long service life.

However, since the conventional floats are formed integrally, it is difficult to have great buoyancy. That is, since the buoys are made integrally, if a large buoyancy is required, the buoys should be made largely integrally so as to have an air filled area that meets the necessary buoyancy. Accordingly, the manufacturing cost is increased due to the expansion of the blow molding machine.

In addition, conventional floats have been difficult to produce to increase the volume in order to increase buoyancy. In order to produce a volume-enhanced float, a heated synthetic resin material is supplied to the blow molding machine so as to deform the shape. In this way, by injecting air into the interior of the synthetic resin material supplied to the blow molding machine is made in the air filled state inside. At this time, when the volume produced in the mouth increases, it is difficult to maintain the temperature of the synthetic resin material as a whole during air filling. As a result, the heated synthetic resin material is lowered in part temperature, and is fixed at the lowered temperature part. That is, the synthetic resin material supplied to the blow molding machine was hardened in the form where the temperature was lowered or stuck to the molding machine, so that it was difficult to be processed in the correct form.

In addition, the conventional floats have to be made of a large weight of the synthetic resin material so that the volume is enlarged in order to increase the buoyancy, it was difficult to handle the synthetic resin material molded in the heated state. That is, it was difficult to blow a large amount of synthetic resin material by blowing air in the blow molding machine while maintaining a constant temperature so that the shape is deformed. In order to enlarge the volume, air is blown with a heavy-weight synthetic resin material supplied. At this time, air must be supplied until a large volume is reached quickly so that deformation of the mouth can be minimized. Accordingly, when the volume of the mouth and the weight of the synthetic resin material are increased, a large amount of high pressure compressed air is needed at a time, and the size of the inlet for introducing the same must be large. There is a limit to the supply amount of compressed air and thus the size of the inlet port through which air is introduced. In other words, if the compressed air is temporarily supplied excessively, the volume is not constant to increase and the thickness of the mouth is changed. Also, if the inlet is too large, the sealing operation cannot be performed after the air is filled. Therefore, the conventional floats cannot be made larger than a predetermined volume, so that it is difficult to increase buoyancy.

In addition, the conventional floats are manufactured integrally with the air filled therein, so that the buoyancy is temporarily lost when the internal air flows due to some damage. That is, there is a problem in that the air filled in the interior is temporarily discharged to the damaged portion, and water is introduced into the outside by the difference in the discharged air pressure to lose buoyancy.

Therefore, there is a problem not only expensive economic burden but also technically difficult to produce large floats for obtaining large buoyancy.

The problem to be solved by the present invention is that by assembling a plurality of unit body to the coupling body through the fastening means is completed one assembly-type ball, through which the user can adjust the size of the ball according to the desired buoyancy size, By making it possible to increase the float according to the needs of the place where the user can be used, the user can be assembled assembling buoys, the molding to produce a large float to be used, especially when you want a large buoyancy is a large size desired through this design The molding cost is reduced by the formation of the buoys, and even if one of the unit bodies coupled to the coupling body through the fastening means is broken and the buoyancy decreases, the remaining unit bodies are connected to the coupling body through the fastening means and float as buoyancy bodies. The function as a float can be maintained and complemented, and it is stable, and only the damaged unit body can be replaced. It is possible to provide an efficient assembly structure in terms of economic feasibility.

Assembled buoy according to an embodiment of the present invention, in the buoy with buoyancy, having a buoyancy portion having an air layer filled with air therein and having a coupling protrusion inserted into the coupling groove of the coupling body on the outer surface of the buoyancy portion; Unit body, the coupling body of the unit body is inserted, the coupling body having a coupling groove, characterized in that consisting of the fastening means for fastening the coupling unit and the unit body, the coupling protrusion in the unit body to the coupling body It is inserted and closing the air in the coupling groove, which is completed by the unit body is coupled to the coupling body by the fastening means, is an assembled sub-ball.

Specifically, in the buoyancy buoy, the buoyancy portion having an air layer filled with air therein and the coupling projection is a coupling projection coupling hole while having a coupling protrusion inserted into the coupling groove of the coupling body on the outer surface of the buoyancy portion. A unit body having a coupling groove having a coupling groove into which the coupling protrusion in the unit body is inserted, the coupling body having a coupling groove coupling hole in the coupling groove, and the coupling protrusion of the unit body being inserted into the coupling groove of the coupling body. A bolt for coupling the unit body and the coupling body by connecting a nut while closing the air, the coupling protrusion coupling hole in the coupling protrusion of the unit body and the coupling groove coupling hole in the coupling groove of the coupling body, and the bolt. Is connected to the unit body and the nut is configured to fasten the coupling body, the unit body and the coupling body is made of a synthetic resin integral , It may be a built-up float.

And the assembled buoy, in the buoyancy buoys, buoyancy buoys, buoyancy portion having an air layer filled with air inside and the engaging projection inserted into the coupling groove of the coupling body on the outer surface of the buoyancy portion. The unit body having a coupling body having a coupling groove into which the coupling protrusion in the unit body is inserted, the coupling protrusion on the outer peripheral surface of the coupling protrusion of the unit body includes a coupling groove on the inner wall of the coupling body of the coupling body. Thus, the fastening protrusion is fastened to the fastening groove while closing the air, consisting of a fastening means consisting of concave-convex (凹凸), the unit body and the coupling body may be made of an integral part, made of synthetic resin.

In addition, the assembled buoy is a buoyancy buoy, a buoyancy portion filled with an air layer therein and a unit body having a coupling protrusion inserted into the coupling groove of the coupling body on the outer surface of the buoyancy portion, the coupling in the unit body A coupling body having a coupling groove, into which a protrusion is inserted, includes a screw thread on an outer circumferential surface of the coupling protrusion of the unit body, and a thread groove on an inner wall of the coupling groove of the coupling body. Consists of a fastening means consisting of a screw thread and a screw groove, which is fastened to the groove, the unit body and the coupling body may be an assembled sub-ball, made of an integral synthetic resin.

 As the fastening means for coupling the unit body and the coupling body, an integral fastening means such as a wire or a wedge may be used.

In addition, the coupling body may be an assembled buoy which is a coupling body having a buoyancy part including an air layer therein by blow molding.

On the other hand, the synthetic resin constituting the unit body and the bonding body is polyethylene (LDPE & HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), styrene acrylic By any one of nitrile butadiene (ABS) resins and nylon (PA), mixtures of aliphatic co-polymers and aliphatic polyester co-polymers (PET- Aliphatic-Co-Polymers) and mixtures of two or more thereof It may be a prefabricated float, which is a synthetic resin consisting of the selected group.

In addition, the synthetic resin constituting the unit body and the bonding body is a mixture of a polyester (PET) and an aliphatic copolymer (Aliphatic-Co-Polymer) and an aliphatic polyester copolymer (PET-) having an air layer therein by blow molding. Aliphatic-Co-Polymer) may be an assembled ball consisting of any one. In addition, the material forming the unit body may be a degradable plastic.

In addition, the synthetic resin constituting the unit body and the coupling body may be an assembled float that is a degradable plastic.

Assembled buoy according to an embodiment of the present invention is a buoy with buoyancy, the overall function of the buoy is a plurality of unit body that serves as a buoyancy body of a small size is coupled through the coupling body to form a large float Where a large ball is needed, it can perform the same function as a single big ball, and various shapes of the ball can be manufactured according to the number of units of the unit body, and the capacity can be easily adjusted and used according to the intended use. Since it can be applied in various forms, there is an advantage to expand the versatility. This has the advantage that the blow molding cost is reduced when the production of large floats is required.

In addition, there was an environmental problem because the small sized spheres used in the prior art were stacked on the coast due to a typhoon, etc., and the small sized spheres having the function of buoyancy body were recycled and assembled to the coupling body. Since it is possible to make molds, there is a great effect on the environment, such as reducing production costs and preserving the ecosystem.

In addition, the assembly-type float made by assembling a plurality of unit bodies does not lose buoyancy if the whole unit is not broken as the other unit body has buoyancy even if one or more unit bodies loses buoyancy due to breakage. Therefore, the stability is improved.

In addition, the assembly-type float according to the present embodiment can be replaced for each unit body as a plurality of unit bodies are coupled, and the effect is to increase the service life is made of a synthetic resin stronger than the foam resin. .

In addition, the granules according to the present embodiment can be molded by selecting from the material of the synthetic resin according to the use purpose and shape, increase the strength in winter, or select the synthetic resin that is naturally decomposed to increase the functionality There is this.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Like parts are designated by like reference numerals throughout the specification.

Then, the assembly-shaped float according to an embodiment of the present invention looks at with reference to FIGS.

1 is a perspective view showing the assembly-shaped float according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line I-I of Figure 1, Figure 3 is an exploded perspective view showing the assembled portion of Figure 1, Figure 4 is 1 is a perspective view of an embodiment showing another shape to which the assembled float of FIG. 1 may be applied.

1 to 4, the assembled buoy 900 according to an embodiment of the present invention includes a unit body 100, a coupling body 200, and a fastening means 300.

Looking at the specific content for the implementation of the invention with reference to Figure 3, the unit body 100 includes a buoyancy portion 120 and the outer surface of the unit body is filled with an air layer 110 therein includes a coupling projection (130) And, the coupling protrusion has a size that can be inserted while being sealed in the coupling groove 230 in the coupling body, and the coupling protrusion 130 passes through the inside in a straight direction from the top of the coupling protrusion circumference to the lower portion of the circumference It has a coupling protrusion coupling hole 140 to penetrate, the diameter of the coupling protrusion coupling hole has a diameter of the size of the air layer is sealed while being engaged with the nut 320 is engaged with the diameter of the bolt 310 is a fastening means. The coupling body has a coupling groove 230, the coupling groove passing through the coupling groove in a linear direction from the upper side of the outer wall of the coupling groove and the lower coupling groove coupling penetrating from the inner wall of the coupling groove 241 to the lower outer wall It has a ball 242. The coupling protrusion 130 is inserted while the air is sealed in the coupling groove 230 in the coupling body, the fastening means bolt 310 from the upper coupling groove coupling hole 241 from the coupling protrusion coupling hole 140 and the lower Passing through the coupling groove coupling hole 242 is connected to the nut 320 is assembled while closing the air. Through the coupling relationship as described above, the plurality of unit bodies 100 are coupled to the coupling body 200, thereby completing the assembly-type float 900 of a desired size.

The coupling body 200 is not integrally formed with the unit body 100 and is an independent component of each other. Unit body 100 and the coupling body 200 is made of a synthetic resin.

The synthetic resins mentioned above are polyethylene (LDPE & HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyester (PET), styrene acrylonitrile butadiene (ABS) resin and nylon (PA), a mixture of aliphatic copolymers (Aliphatic-Co-Polymers) and aliphatic polyester copolymers (PET- Aliphatic-Co-Polymers), and any one or more thereof. . That is, it may be selected and used in the above-described synthetic resin group according to the use purpose and installation place of the assembled buoy 900.

In addition, the synthetic resin may be a degradable plastic.

Synthetic resin is a kind of high molecular compound and does not rot. When an incorruptible resin is thrown into the ocean, it destroys the food chain of fish, algae, and seaweed. In addition, when the resin is embedded in the ground, polluting the soil by preventing smooth air communication. In order to solve this pollution problem, degradable plastics that have been decomposed in a natural state have been developed. Degradable plastics may be classified into biodegradable plastics that are decomposed into microorganisms and photodegradable plastics that are decomposed by ultraviolet rays. Therefore, after the predetermined period, the unit body 100 and the coupling body 200 are decomposed plastics that are naturally decomposed, thereby minimizing environmental destruction even after disposal.

In addition, the unit body 100 may be molded by blow molding. Blow molding according to this is determined according to the shape of the unit body 100 to be molded. A blow molding machine that can be molded according to a predetermined shape and size is adopted, and a mold is installed accordingly. The inside of the provided mold is supplied with a synthetic resin heated to a temperature at which the shape can be deformed. After the synthetic resin is supplied, air is injected to form the air layer 110. At this time, the air is injected into the position where the engaging projection 130 is formed to protrude in the outward direction of the unit body 100. When air is injected, the heated synthetic resin is expanded to form the buoyancy portion 120 having the air layer 110 formed therein by a mold. When the molding of the unit body 100 is finished, the coupling protrusion 130 is formed by protruding and bonding the air injection portion outward while closing the air layer 110 into which air is injected. Therefore, the unit body 100 may be manufactured by blow molding so that the position at which the air is injected is bonded to the protrusion to form the coupling protrusion 130.

Bolts that are fastening means by means of a general drill tool, etc. through the inside of the coupling protrusions 130 through the inside without passing through the air layer 110 from the outer upper portion of the coupling protrusion 130 in the unit body manufactured as described above Coupling protrusion coupling hole 140 is formed according to the size of (310).

When the unit body is molded through a mold, the coupling protrusion 130 may be formed in the coupling protrusion 130, and the unit body may be manufactured using synthetic resin as a material using a blow molding method.

In addition, the coupling body 200 may be manufactured so that an air layer is not formed by a blow molding method through a mold, and the material may be a polyester that may be manufactured in a form most suitable for molding through a mold. The synthetic resin may be made of any one of a mixture of polyester (PET) and aliphatic copolymer (Aliphatic-Co-Polymer) and aliphatic polyester copolymer (PET- Aliphatic-Co-Polymer). Aliphatic copolymers are mixed with polyesters to increase cold resistance. When manufacturing a mold to determine the number of unit body 100 to be coupled to fit the desired size of the ball, the coupling body 200 having a coupling groove 230 that can be inserted into the coupling protrusion 130 suitable for the number Produce a mold, but the coupling groove 230 in the coupling body to produce a mold to be molded into a protrusion, the coupling groove on the coupling groove of the coupling body is formed through the mold to match the diameter of the bolt upper coupling groove The upper coupling groove coupling hole 241 is formed through the coupling groove in the lower coupling groove coupling hole 242 penetrating to the lower portion of the outer coupling groove inside the coupling groove. In addition, when the mold is manufactured, the upper coupling groove coupling hole 241 and the lower coupling groove coupling hole 242 may be formed in the coupling groove 230 to manufacture the coupling body 200 using the synthetic resin. have.

In addition, the coupling body 200 may be manufactured by blow molding to form an air layer therein, and at this time, the integral polyester to have an air layer inside by blow molding so that an air layer is formed inside the coupling body. (PET). That is, polyester which can be produced in a form most suitable for blow molding may be used as a synthetic resin, and the synthetic resin is a mixture of polyester (PET) and aliphatic copolymer (Aliphatic-Co-Polymer) and aliphatic polyester copolymer ( PET-Alphatic-Co-Polymer). Aliphatic copolymers are mixed with polyesters to increase cold resistance. The thermal properties of the polyester remain undeformed at temperatures from -60 ° C to + 150 ° C. In extreme climates and glacial landforms, ocean water temperatures can drop below -60 ° C. Thus, in order to prevent deformation of the assembled buoy 900, the aliphatic copolymer may be mixed with polyester, or the cold resistance may be increased by using a synthetic resin containing the aliphatic copolymer in the preparation of the polyester. Therefore, deformation of the assembled buoy 900 may be prevented due to temperature decrease, and thus life may be increased.

Here, in the present specification, for convenience of description, the unit body 100 has a shape having an air layer 110 by blow molding and is formed to form a coupling protrusion, and the coupling body 200 is a unit body 100. All molding methods that may have a coupling groove 230 to be inserted are included, and may be molded by blow molding to have an air layer inside the coupling body. The coupling protrusion 130 of the unit body is inserted into the coupling groove 230 of the coupling body 200, in which the coupling groove is formed in the unit body and the coupling body is formed in the coupling groove of the unit body. It also includes the form. That is, the use of the coupling protrusion and the coupling groove through both substitutions will be apparent to those skilled in the art, and the unit body 100 and the coupling body 100 to be formed are each included in the technical idea of the present specification even if a molding method is used in addition to blow molding. It is apparent to those skilled in the art.

The fastening means 300 includes a bolt 310 and a nut 320 for fastening the unit body 100 to the coupling body 200. Bolt 310 is the upper coupling groove coupling hole 241 in the coupling groove 230 of the coupling body and the coupling protrusion coupling hole 140 in the coupling protrusion of the unit body and the lower coupling groove coupling in the coupling groove of the coupling body It is inserted into the ball 242 and closed with air closing through the nut 320. The fastening means is fastened at each of the parts connected to the coupling groove of the coupling body of the unit body for manufacturing the assembled buoy 900.

The material of the fastening means may be made of any synthetic resin or metal material.

It looks at with reference to Figure 5 of the assembled buoy with another fastening in one embodiment of the present invention described above.

5 is an exploded perspective view illustrating another fastening means of the assembled buoy of FIG. 4, wherein the unit body 100 is connected to the coupling body 200, and then is an exploded perspective view of the assembled buoy 900 completed through other fastening means. .

Referring to Figure 5, the unit body 100 includes a buoyancy portion 120 and the coupling protrusion 130 on the outer surface of the unit body filled with the air layer 110 therein, the coupling protrusion is coupled to the coupling body 200 It has a size that can be inserted while being sealed in the coupling groove 230, the coupling protrusion has a fastening protrusion 311 on the coupling projection circumference, the coupling body 200 has a coupling groove 230, The inner wall of the coupling groove 230 has a fastening groove 321, the fastening protrusion 311 and the fastening groove 321 is a fastening means of the assembled sub-ball. The unit body is connected to the coupling body is that the coupling protrusion 130 of the unit body is inserted into the coupling groove 230 in the coupling body and the coupling protrusion 311 and the coupling groove 321 in the coupling groove of the coupling protrusion. It is assembled by closing the air by the coupling principle of irregularities. Through the coupling relationship as described above, the plurality of unit bodies 100 are coupled to the coupling body 200, thereby completing the assembly-type float 900 of a desired size.

One embodiment of the present invention described above looks at with reference to Figure 6 of the assembled buoy with another fastening portion.

6 is an exploded perspective view showing still another fastening means of the assembled subassembly of FIG. That is, after the unit body 100 is connected to the coupling body 200 is an exploded perspective view of the assembled buoy 900 is completed through another fastening means.

Looking at Figure 6, the unit body 100 includes a buoyancy portion 120 and the coupling protrusion 130 on the outer surface of the unit body filled with an air layer 110 therein, the coupling protrusion 130 is coupled to the coupling body It has a size that can be inserted while being sealed in the coupling groove 230, the coupling protrusion has a thread 312 on the coupling protrusion circumference, the coupling body 200 has a coupling groove 230, the The inner wall of the coupling groove 230 has a screw groove 322, the screw thread 312 and the screw groove 322 is a fastening means of the assembled sub-ball. The unit body is connected to the coupling body is that the coupling protrusion 130 of the unit body is inserted into the coupling groove 230 in the coupling body, the thread 310 in the coupling protrusion air in the screw groove 320 in the coupling groove Close the unit body is fastened to the coupling body. Through the coupling relationship as described above, the plurality of unit bodies 100 are coupled to the coupling body 200, thereby completing the assembly-type float 900 of a desired size.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Of the right.

1 is a perspective view showing the assembled buoy according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II of FIG. 1. FIG.

Figure 3 is an exploded perspective view showing the assembling section of Figure 1;

4 is a perspective view of an embodiment showing another shape to which the assembled float of FIG. 1 may be applied.

5 is an exploded perspective view showing another fastening means of the assembled float of FIG.

Figure 6 is an exploded perspective view showing another fastening means of the assembled buoy of FIG.

* Description of the symbols for the main parts of the drawings *

100: unit body 110: air layer

120: buoyancy portion 130: engaging projection

140: coupling projection coupling hole 200: coupling body

230: coupling groove 240: coupling groove coupling hole

241: upper coupling groove coupling hole 242: lower coupling groove coupling hole

300: fastening means 310: bolt

311: fastening protrusion 312: thread

320: nut 321: fastening groove

322: screw groove 900: assembly section

Claims (5)

In buoyancy buoys, A unit body having a buoyancy portion having an air layer filled with air therein and a coupling protrusion inserted into the coupling groove of the coupling body on an outer surface of the buoyancy portion, Coupling body having a coupling groove, the coupling protrusion of the unit body is inserted, Consists of the fastening means for fastening the unit body and the coupling body, The coupling protrusion in the unit body is inserted into the coupling groove in the coupling body to close the air, characterized in that the unit body is completed by being coupled to the coupling body by a fastening means, Prefabricated floats. In buoyancy buoys, A unit body having a buoyancy portion having an air layer filled therein and an outer surface of the buoyancy portion having a coupling protrusion inserted into a coupling groove of the coupling body while the coupling protrusion has a coupling protrusion coupling hole; A coupling body having a coupling groove coupling hole in the coupling groove while having a coupling groove into which the coupling protrusion in the unit body is inserted; The coupling protrusion of the unit body is inserted into the coupling groove of the coupling body, and the coupling protrusion coupling hole in the coupling protrusion of the unit body and the coupling groove coupling hole in the coupling groove of the coupling body are connected to the nut while closing the air. Bolts for fastening the unit body and the coupling body, and It is composed of a nut which is connected to the bolt and fastening the unit body and the coupling body, The unit body and the coupling body is characterized in that consisting of a single synthetic resin, Prefabricated floats. In buoyancy buoys, A unit body having a buoyancy portion having an air layer filled with air therein and a coupling protrusion inserted into a coupling groove of the coupling body on an outer surface of the buoyancy portion, A coupling body having a coupling groove into which the coupling protrusion in the unit body is inserted; The outer circumferential surface of the coupling body of the unit body includes a fastening protrusion, and the inner wall of the coupling groove of the coupling body includes a fastening groove, and the fastening protrusion is fastened to the fastening groove while closing the air. Consists of fastening means, The unit body and the coupling body is characterized in that consisting of a single synthetic resin, Prefabricated floats. In buoyancy buoys, A unit body having a buoyancy portion filled with an air layer therein and an outer surface of the buoyancy portion having a coupling protrusion inserted into a coupling groove of the coupling body; A coupling body having a coupling groove into which a coupling protrusion in the unit body is inserted, A fastening means consisting of a screw thread and a screw groove comprising a screw thread on the outer circumferential surface of the coupling body of the unit body and a screw groove on the inner wall of the coupling groove of the coupling body, the screw thread being coupled to the screw groove while closing air. It consists of The unit body and the coupling body is characterized in that consisting of a single synthetic resin, Prefabricated floats. The method according to any one of claims 1 to 4, The coupling body is assembled body, characterized in that the coupling body having a buoyancy part including an air layer therein by blow molding.

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