JP3511545B2 - Water float and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a farming raft for oysters and the like,
The present invention relates to a floating float attached to aquaculture cages and floating piers, and a method for manufacturing the float.

[0002]

2. Description of the Related Art Conventionally, a float made of resin has a hollow inside as a float for water of this type (Actual Kaihei 2-123496).
No.), in which the inside of the float is filled with foamed resin
3-180129), those using styrofoam as the foaming resin (Shokai Sho-49-132590, Suikaihei 3-109994) and the like are known.

[0003]

In the structure in which the inside of the float is hollow, when the float is damaged and the hermeticity cannot be maintained, the buoyancy may decrease due to the water immersion, or the buoyancy may completely disappear. Occur. Also, when Styrofoam is filled in the float, the buoyancy does not immediately decrease due to water immersion, but during long-term use, the volume is reduced by being crushed by water pressure or external impact, and buoyancy is reduced. There is a problem of decrease.

The float is generally formed of resin into a hollow hermetically sealed body, but there is a problem that the air inside the float is expanded and the float is deformed or ruptured when exposed to hot weather before construction.

The present invention has been made in order to solve such a problem, and is capable of stably holding buoyancy for a long period of time, strong against impact, and even when the air inside the float thermally expands. Provided is a float for water, which does not deform or break, and a method for producing the float.

[0006]

[0007]

A float for water according to the present invention (Claim 1 ) comprises a float body made of a hollow body made of a resin, and a plurality of flexible bodies filled in the float body. In a float for water comprising an air balloon made of a resin film, the float body is composed of two float divided bodies having openings, and the float divided bodies are filled with a plurality of the air balloons and the openings are formed. Is sealed with a flexible resin film,
The opening portions are overlapped with each other and the two float divided bodies are joined together. Since each float division body is sealed with the resin film, even if water is infiltrated from the joint portion of the float division body, the invasion of water is blocked here and does not enter the resin float division body.

In the present invention (claim 2 ), the above 2
A gap space is formed between the resin films, and
The coupling portion of the opening is formed so as to face the clearance space. As a result, even if water enters from the joint portion of the opening, the invading seawater stays in the gap and does not enter the float division body.

In the present invention (claim 3 ), the float body is formed of a thermoplastic resin reinforced with glass fibers, and the resin film is formed of a thermoplastic resin. With this structure, the resin film is bonded to the opening of the float divided body by heat welding.

Further, in the method for manufacturing a float for water according to the present invention (claim 4 ), two float divided bodies having openings are filled with a plurality of air balloons, and the openings are formed into a flexible resin film. After sealing by sealing, the openings are superposed and joined together.

[0011]

1 to 3, reference numeral 1 is a float body having a substantially cylindrical shape, and two float divided bodies 2 and 2 are joined to each other to form a hollow body. The float splits 2 and 2 have a thickness of about 3 reinforced with glass fiber.
A 5 mm to 5 mm thermoplastic plate is used. Reference numeral 3 denotes an opening portion of the float divided body 2, and 4 denotes a collar portion having a step formed on the edge of the opening portion 3. Here, the inner side having different steps is referred to as an inner collar portion 4a, and the outer side is referred to as an outer collar portion 4b. Also, the step is
It is about 5 mm to 1 cm. The outer flange portions 4b, 4b of the two float divided bodies 2, 2 are overlapped with each other, and the bolt 5
And the nut 6 for connection. The plurality of air balloons 7, 7 ... Are filled in the float divided bodies 2, 2 and are formed of a flexible resin film. Reference numerals 8 and 8 denote flexible resin films that cover the openings 3 and 3. The peripheral portions of the resin films are welded to the inner flange portions 4a and 4a to seal the insides of the float divided bodies 2 and 2.

A method of manufacturing a float for water having the above structure will be described. The float division bodies 2 and 2 are formed by a press forming method or a vacuum forming method. That is, in the case of the press molding method, a thermoplastic resin sheet containing glass fibers is heated and softened, and this is placed on a mold having a semi-cylindrical shape and pressed. When using the vacuum forming method,
Instead of pressing, a vacuum is drawn from a plurality of pores formed on the surface of the mold, and the heat-softened resin sheet is forced to follow the surface of the mold. The float divided bodies 2, 2 thus formed are filled with air balloons 7, 7, ... To the vicinity of the openings, and then the openings 3 are covered with a resin film 8. The size of the peripheral portion of the resin film 8 is set so as to ride on the inner collar portion 4a. At this portion, the resin film 8 is welded to the float division body 2 and the float filled with the air balloons 7, 7, .... The inside of the split body 2 is completely sealed. Thermal welding or high frequency welding can be used for this welding. After that, the two float division bodies 2 and 2 are overlapped so that the openings 3 and 3 face each other, and the outer collar portions 4b and 4 are formed.
b is connected with a bolt 5 and a nut 6. For this connection, instead of the bolt 5 and the nut 6, heat welding or high frequency welding can be used. In this case, since a slight gap is formed in the joint portion, a portion that is not welded or a region where the weld width is narrowed can be formed.

In the float having the above construction, when the float is constructed, the float divided bodies 2, 2, the air balloons 7, 7, ..., The resin films 8, 8 are conveyed to the installation site in a divided state. Since the float division bodies 2 and 2 for transportation have a shape obtained by cutting a cylindrical body in half, they can be stacked and the transportation efficiency can be improved. The float is assembled at the installation site. At the time of this assembling, the work is relatively easy because a heat welding device or a high frequency welding device is sufficient.

The assembled float main body 1 may be temporarily placed at the installation site and may be exposed to high temperatures under the hot sun. In such a case, since the inside of the float division body 2 is sealed, the air inside expands thermally. Thus, as shown by the broken line in FIG.
Expands and absorbs the expansion pressure, so that the float division body 2 is not deformed or ruptured. At this time, the gap space is narrowed due to the expansion of the resin film 8,
The air in this space is discharged to the outside through the gap between the connecting portions of the float split bodies 2, 2.

[0015]

EXAMPLE As the material of the float division body 2, a sheet having a thickness of about 4 mm in which polypropylene resin which is a thermoplastic resin is reinforced with a long glass fiber mat is used. This sheet
If two layers of long glass fiber mats are sandwiched between three layers of polypropylene resin, mechanical strength comparable to that of metal,
It has impact resistance and excellent moldability. It is also suitable as a material for floats because it is lightweight. After molding, the float body 1 has a diameter of 71 cm, a length of 110 cm, and a wall thickness of 3
It is formed in a hollow cylindrical shape of mm.

As a material for the air balloons 7, ..., A polyethylene / polyethylene terephthalate laminate film having excellent flexibility and high mechanical strength can be used. At the time of manufacturing, air-filled air balloons are formed by thermocompression-bonding air into a cylindrical film at predetermined intervals while cutting the pressure-bonded portions. Fig. 4 shows an example of this, and the dimensions are, for example, 5c in the vertical direction.
m, width 8 cm, thickness of bulge can be about 3 cm. The strain rate of these air balloons 7, 7, ... Is 80% at a load of 100 kg and about 90% at a load of 200 kg. Even if 1500 kg is added, the strain rate reaches close to 100% but did not burst. As a material for the resin film 8, a polyethylene resin film having a thickness of 0.5 to 1.0 mm is suitable. This is because this resin is a chemically stable material, and therefore it does not deteriorate even when wet with seawater or the like, and has excellent mechanical strength such as impact resistance.

[0017]

According to the present invention (Claim 1), the float main body is composed of two float divided bodies, and each float divided body is sealed with a resin film at its opening, so that the float divided body is formed. Water ingress into the body is prevented double with the air balloon, and buoyancy is maintained stable.

[0018]

Further, according to the present invention (claim 2 ), since the joint portion of each float division body faces the gap space formed by the two resin films covering the opening, Even if seawater or the like enters, the seawater only stays in this gap space, does not enter the float division body, and there is no fear that the buoyancy will decrease. In addition, even if the air inside the float body is thermally expanded by being exposed to hot weather during construction, etc., the resin film that closes the opening of the float split body swells and absorbs it, so the float body is deformed or destroyed by the thermal expansion pressure. The accident of doing is prevented.

According to the present invention (Claim 3 ), each float body is made of a thermoplastic resin reinforced with glass fiber, and the resin film is made of the same thermoplastic resin film. Welding is easy and its strength is strong. Therefore, the airtightness of the float divided body incorporating the air balloon is improved.

According to the present invention (claim 4 ), two float divided bodies are filled with a plurality of air balloons, the openings of the float divided bodies are sealed with a resin film, and then the float divided bodies are superposed. Since they are connected, the construction is easy, and therefore the divided parts can be transported to the construction site and assembled. The float body is generally a hollow body after assembly and has a large bulk, and normally the transportation efficiency and the like are extremely poor. However, the above method solves this problem.

[Brief description of drawings]

FIG. 1 is a perspective view of a floating float for water 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 for explaining an assembled state of the float divided body.

FIG. 4 is a perspective view showing an air balloon.

[Explanation of symbols]

1 ... Float body 2 ... Float division 3 ... Opening 4 ………… Tsubabe 4a ………… Inner collar part 4b ......... Outer collar part 5 ......... Bolt 6 ...... nuts 7 ... Air balloon 8 ... Resin film

Claims (4)

(57) [Claims] 1. A float for water, comprising a float body made of a hollow body made of resin and an air balloon made of a plurality of flexible resin films filled in the float body, wherein the float body is , With opening
Consists of two float divisions,
The openings are filled with a plurality of the air balloons.
The part is sealed with a flexible resin film,
Mouth portions are overlapped and the above two float divisions are joined.
Water for the float formed by With a gap space is formed wherein between the two resin films, water float according to claim 1, wherein coupling portions of the opening facing the the clearance space Wherein the float body, the resin film with formed in reinforced thermoplastic resin with glass fibers, which are formed of a thermoplastic resin according to claim 1 or
2 float for water 4. A water surface in which two float divided bodies each having an opening are filled with a plurality of air balloons, the openings are sealed with a flexible resin film, and then the openings are superposed and combined with each other. Float manufacturing method