JP2001010697A - Structural panel and liquid-storing tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structural panel which is lightweight, strong, and excellent in corrosion resistance and chemical resistance and also excellent in dimensional stability and adaptable to fabricating a structure in a simple way even though the structure is large in a size, and to provide a liquid storing tank built up of such structural panels. SOLUTION: An intermediate layer 4 made of a punched metal is interposed between a surface layer 2 and a reverse side layer 3, both of which are made of fiber reinforce plastics, and a panel is molded so that the surface layer 2 and the reverse side layer 3 are connected together through holes 5 of the punched metal. Since the surface layer 2 and the reverse side layer 3 are satisfactorily stuck to the punched metal and supported therewith at the time of molding, a dimensional stability and a stability in keeping the shape are sufficiently ensured during the setting shrinkage of the fiber reinforced plastics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural panel used for assembling a liquid storage tank such as a water storage tank, a fire protection water tank and a gasoline tank, and more particularly, to an assembly using the structural panel. Liquid storage tank.

[0002]

2. Description of the Related Art Conventionally, liquid storage tanks such as water storage tanks, fire prevention water tanks and gasoline tanks are often large, so that it is difficult to transport and install tanks manufactured in factories to the site. Since then, it is manufactured by assembling steel structural panels or ring segments locally. However, since the steel liquid storage tank has poor corrosion resistance and chemical resistance, for example, fiber reinforced plastic (FRP)
So-called FSF tank (FRP-
The use of Steel-FRP tanks is becoming widespread.

[0003]

However, in the FSF tank, since the FRP is lined on the steel plate, the surface of the steel plate is subjected to a surface treatment such as sandblasting in order to secure the adhesion at the interface between the steel plate and the FRP. However, there is a problem in that it requires time and effort, and the number of working steps increases, leading to an increase in cost.

The present invention has been made in order to solve such problems, and it is an object of the present invention to be lightweight and high-strength, have excellent corrosion resistance and chemical resistance, and have high dimensional stability. An object of the present invention is to provide a structural panel which can be easily assembled even with a good and large-sized structure, and a liquid storage tank using the structural panel.

[0005]

In order to achieve the above object, an invention according to claim 1 is a structural panel,
An intermediate layer made of punched metal is interposed between the surface layer and the back surface layer made of fiber reinforced plastic, and the surface layer and the back layer are continuously formed through the holes of the punched metal. It is characterized by:

According to such a configuration, at the time of molding, the fiber reinforced resin for forming the front layer and the back layer is continuous with each other through the holes of the punching metal. Are molded in a state where they are in close contact with each other. Therefore, the surface layer and the back surface layer are formed while being supported by the punching metal in such a close contact state.

According to a second aspect of the present invention, an intermediate layer made of a punched metal is interposed between a front layer and a back layer made of a fiber-reinforced plastic, and a hole in the punched metal has a reinforcing fiber. And the front surface layer and the back surface layer are continuously formed via holes of the punching metal.

According to such a configuration, at the time of molding, the fiber reinforced resin for forming the front layer and the back layer is continuous with each other through the holes of the punching metal. Are molded in a state where they are in close contact with each other. In this case, depending on the molding conditions and the like, only the resin of the surface layer and the back layer may penetrate into the holes of the punched metal, and the reinforcing fibers may not easily enter the holes. Although the adhesion between the back layer and the punched metal may be reduced, in the present invention, since the reinforcing fibers are positively filled in the holes of the punched metal, for example, the resin of the surface layer and the back layer is not filled. Even if only the permeation into the holes of the punched metal, the filled reinforcing fibers are impregnated with the resin in the holes. Therefore, such a defect is effectively prevented.

[0009] The invention described in claim 3 is the first invention.
Alternatively, in the invention described in Item 2, at least a part of the peripheral end is a connecting portion that can be coupled to the peripheral end of the structural panel adjacent to each other.

According to such a configuration, since the peripheral end of the structural panel is a connecting portion for connecting the structural panels as they are, a separate connecting portion is not provided, and the structure is simplified. , Each structural panel can be connected.

[0011] The invention described in claim 4 is the same as the claim 3.
Wherein at least a part of a peripheral end of the intermediate layer is exposed from the front surface layer and the back surface layer, and an exposed portion of the intermediate layer is bonded to an exposed portion of an adjacent intermediate layer. It is characterized by being a possible connection part.

According to such a configuration, since a part of the intermediate layer is used as a connecting portion for connecting the structural panels as they are, no separate connecting portion is provided, and each of the structural layers can be provided with a simple structure. Panels can be connected.
Moreover, since the exposed portion of the steel punching metal constitutes the connecting portion, the connecting portion can be formed thin, and the rigidity of the connecting portion of each structural panel can be sufficiently increased.

The invention described in claim 5 is the third invention.
In the invention described in the above, at least a part of the peripheral end portion is formed only by the front surface layer and the back surface layer without the intermediate layer being interposed, and formed only by the front surface layer and the back surface layer. The connecting portion is formed by forming a bent portion in a bent shape.

According to such a configuration, since the connecting portion is formed by bending only the front surface layer and the back surface layer, it is not necessary to bend the rigid intermediate layer.
The connecting portion can be formed with a simple configuration.

According to a sixth aspect of the present invention, there is provided a liquid storage tank, which is assembled by the structural panel according to any one of the first to fifth aspects.

According to such a structure, since a structural panel which is lightweight and high in strength and has good dimensional stability is used, even a large liquid storage tank can be dimensioned by simple assembly on site. It can be manufactured with high accuracy.

[0017]

FIG. 1 is a schematic perspective view showing an embodiment of a liquid storage tank according to the present invention. In FIG. 1, a liquid storage tank 11 is used as a water storage tank, a fire prevention water tank, a gasoline tank, and the like. A square-plate-shaped structural panel 1 has a top surface, a bottom surface, a front surface, and a back surface. 6 sheets (3 sheets x 2 rows), 4 sheets each (2 sheets x 2 rows) are used on the right and left sides,
Assembled in a rectangular box shape. In addition, FIG.
This is for explaining the main configuration of the appearance of the liquid storage tank 11, and details are omitted. Further, for example, if the structural panel 1 has a size of about 2.1 m square, it is used as the liquid storage tank 11 having a capacity of 100 m ³ .

FIG. 2 is a sectional view taken along the line AA of one embodiment of the structural panel shown in FIG. 1, FIG. 3 is a conceptual view of a main part for explaining the internal structure of the structural panel shown in FIG. FIG. 4 is an enlarged sectional view taken along line BB of one embodiment of the structural panel shown in FIG. 1, and FIG. 5 is a cross-sectional view of one embodiment of the structural panel shown in FIG.
6 is a cross-sectional view taken along line DD of one embodiment of the structural panel shown in FIG. 1. Next, the structural panel of the present embodiment will be described with reference to FIGS.

As shown in FIGS. 2, 3 and 5, this structural panel 1 has a flat surface layer 2 made of fiber reinforced plastic, a flat back layer 3 also made of fiber reinforced plastic, The intermediate layer 4 is composed of a flat plate-shaped punching metal and an intermediate layer 4 interposed between the surface layer 2 and the backside layer 3. It is formed continuously through the hole 5.

As shown in FIGS. 2 and 5, the front surface layer 2 and the back surface layer 3 are superposed on the intermediate layer 4 and the entire surface thereof, and the peripheral ends thereof are adjacent to each other.
And a connecting portion 6 that can be connected to the peripheral end of the connecting portion. More specifically, for example, when connecting a plurality of structural panels 1 on the same plane, the structural panel 1 shown in FIG. 2 is used. That is, in the structural panel 1 shown in FIG. 2, the connecting portion 6 has a cross section substantially L extending outward in a direction perpendicular to the longitudinal direction (lateral direction) of the structural panel 1.
The free end portion 7 is bent in the shape of a letter.
In addition, connection bolt insertion holes 8 are respectively formed. In order to connect the structural panels 1 on the same plane by the structural panel 1 shown in FIG.
As shown in the figure, in a state where the structural panels 1 are arranged on the same plane and the free ends 7 of the connecting portions 6 are in contact with each other,
A bolt 9 is inserted from the bolt insertion hole 8 of one free end portion 7 to the bolt insertion hole 8 of the other free end portion 7, and the nut 1
What is necessary is just to connect by fixing at 0.

In the case where one ends of a plurality of structural panels 1 are connected at right angles, the structural panel 1 shown in FIG. 5 is used. That is, in the structural panel 1 shown in FIG. 5, the connecting portion 6 on one end side is formed to be bent outward at 45 ° with respect to the longitudinal direction (lateral direction) of the structural panel 1. The bent free end portion 7 is provided with a bolt insertion hole 8 for connection. Then, in order to connect one end of each structural panel 1 orthogonally by the structural panel 1 shown in FIG. 5, as shown in FIG. The bolt 9 is inserted from the bolt insertion hole 8 of the one free end 7 to the bolt insertion hole 8 of the other free end 7 in a state where the free end 7 of the connecting portion 6 is opposed to the contact. The connection may be made by fixing with a nut 10.

FIG. 7 is a sectional view taken along the line AA of another embodiment of the structural panel shown in FIG. 1, and FIG. 8 is a line BB of another embodiment of the structural panel shown in FIG. Enlarged sectional view, FIG.
Is a cross-sectional view taken along line CC of another embodiment of the structural panel shown in FIG. 1, and FIG. 10 is an enlarged cross-sectional view taken along line DD of another embodiment of the structural panel shown in FIG. Next, a structural panel of an embodiment different from the structural panel shown in FIGS. 2 to 6 will be described with reference to FIGS.

In the structural panel 1 shown in FIGS. 7 to 10, as shown in FIGS. 7 and 9, the front surface layer 2 and the back surface layer 3 are superposed on the intermediate layer 4 and the entire surface thereof. The peripheral end of 4 is exposed from the surface layer 2 and the back layer 3, and the exposed portion of the intermediate layer 4 is a connecting portion 6 that can be connected to the exposed portions of the intermediate layer 4 adjacent to each other. More specifically, for example, a plurality of structural panels 1
Are connected on the same plane, the structural panel 1 shown in FIG. 7 is used. That is, FIG.
In the structural panel 1 shown in FIG. 1, the connecting portions 6 of the intermediate layer 4 protruding from both ends of the front surface layer 2 and the back surface layer 3 face outward in a direction perpendicular to the longitudinal direction (lateral direction) of the intermediate layer 4. Each of the bent free ends 7 is formed with a bolt insertion hole 8 for connection. And by the structural panel 1 shown in FIG.
To connect the structural panels 1 on the same plane,
As shown in FIG. 8, in a state where the structural panels 1 are arranged on the same plane and the free ends 7 of the connecting portions 6 are in contact with each other, the bolt insertion holes 8 of the one free end 7 are provided. Then, the bolt 9 may be inserted into the bolt insertion hole 8 of the other free end portion 7 from the other end and fixed by a nut 10 for connection. In addition, by forming an overlay layer 12 made of fiber reinforced plastic on the inside of the connecting portion and covering the connecting portion 6, corrosion of the connecting portion 6 made of steel is prevented, and watertightness of the connecting portion is ensured. .

In the case where one ends of a plurality of structural panels 1 are connected at right angles, the structural panel 1 shown in FIG. 9 is used. That is, in the structural panel 1 shown in FIG. 9, the connecting portion 6 of the intermediate layer 4 protruding from one end side of the front surface layer 2 and the back surface layer 3 is outside the longitudinal direction (lateral direction) of the intermediate layer 4. The bent free end portion 7 is formed with a bolt insertion hole 8 for connection. Then, in order to connect one end of each structural panel 1 orthogonally by the structural panel 1 shown in FIG. 9, as shown in FIG.
Are arranged orthogonally to each other, and the free ends 7 of the connecting portions 6 are
In a state where the bolts 9 are opposed to each other in a contact state, bolts 9 are inserted from the bolt insertion holes 8 of the one free end portion 7 to the bolt insertion holes 8 of the other free end portion 7, and the bolts 9 are fixed by the nuts 10. I just need. In addition, an overlay layer 12 made of fiber reinforced plastic is formed on the inside of the connecting portion, and the connecting portion 6 is formed.
, The corrosion of the connecting portion 6 made of steel is prevented, and the watertightness of the connecting portion is ensured.

FIG. 11 is a sectional view taken along line AA of another embodiment of the structural panel shown in FIG. 1. FIG. 12 is a sectional view taken along line BB of another embodiment of the structural panel shown in FIG. Enlarged sectional view,
FIG. 13 is a cross-sectional view of another embodiment of the structural panel shown in FIG.
14 is a cross-sectional view taken along line DD of another embodiment of the structural panel shown in FIG. 1. Next, FIG.
Referring to FIG. 14 to FIG. 14, a description will be given of a structural panel according to an embodiment different from the structural panels shown in FIGS. 2 to 6 and the structural panels shown in FIGS.

The structural panel 1 shown in FIGS. 11 to 14
As shown in FIGS. 11 and 13, the surface layer 2 and the back surface layer 3 are superposed on the intermediate layer 4 and the entire surface thereof, while the peripheral edge portion is formed on the surface without the intermediate layer 4 interposed therebetween. The connection portion 6 is formed by only the layer 2 and the back surface layer 3, and a portion formed by only the surface layer 2 and the back surface layer 3 is formed by bending.
More specifically, for example, when connecting a plurality of structural panels 1 on the same plane, the structural panel 1 shown in FIG. 11 is used. That is, in the structural panel 1 shown in FIG. 11, the connecting portion 6 formed only from the front surface layer 2 and the back surface layer 3 faces outward in a direction perpendicular to the longitudinal direction (lateral direction) of the structural panel 1. L
The free end portion 7 is bent in the shape of a letter.
In addition, connection bolt insertion holes 8 are respectively formed. In order to connect the respective structural panels 1 on the same plane by the structural panel 1 shown in FIG. 11, as shown in FIG. 6 with the free ends 7 facing each other in a contact state, the bolt 9 is inserted from the bolt insertion hole 8 of the one free end 7 to the bolt insertion hole 8 of the other free end 7, and a nut 10 is inserted. What is necessary is just to connect by fixing with.

In the case where one ends of a plurality of structural panels 1 are connected at right angles, the structural panel 1 shown in FIG. 13 is used. That is, in the structural panel 1 shown in FIG. 13, the connecting portion 6 at one end formed only from the front surface layer 2 and the back surface layer 3 has an outward direction 45 with respect to the longitudinal direction (lateral direction) of the structural panel 1. The connecting end of the bent free end portion 7 is formed with a bolt insertion hole 8 for connection. Then, in order to connect one end of each structural panel 1 orthogonally by the structural panel 1 shown in FIG. 13, as shown in FIG. The bolt 9 is inserted from the bolt insertion hole 8 of the one free end 7 to the bolt insertion hole 8 of the other free end 7 in a state where the free end 7 of the connecting portion 6 is opposed to the contact. The connection may be made by fixing with a nut 10.

In the structural panel 1 of the embodiment as shown in FIGS. 2 to 14 described above, the fiber reinforced plastic forming the surface layer 2 and the back layer 3 is obtained by impregnating a reinforcing fiber with a resin. Can be obtained by curing. As the reinforcing fiber as a raw material, a known fiber can be used without any particular limitation, and examples thereof include glass fiber, carbon fiber, silica fiber, and alumina fiber. Preferably, a glass fiber is used. Further, the form of the reinforcing fiber may be a known form without any particular limitation, and examples thereof include a chopped strand mat and a roving cloth. Also, as the resin as a raw material, a known resin can be used without any particular limitation, and examples thereof include an unsaturated polyester resin, an epoxy resin, a vinyl ester resin, and a phenol resin. Preferably, an unsaturated polyester resin is used.

The punching metal as the intermediate layer 4 is a steel plate in which a large number of holes are perforated in an aligned state. Examples of the material include iron, stainless steel, and aluminum. But 30-80%
Is preferred. In addition, the punched metal does not need to be subjected to a special surface treatment for improving the adhesion to the fiber reinforced plastic forming the surface layer 2 and the back surface layer 3. Can be used. Of course, a surface treatment such as sand blasting may be performed. When such a treatment is performed, the surface layer 2 and the back surface layer 3 can be more firmly adhered to the punching metal.

The structural panel 1 of such an embodiment can be formed by a known method such as hand lay-up, spray-up, resin injection, and resin transfer molding.

In the case of molding by hand lay-up or spray-up, for example, first, a reinforcing fiber is impregnated with a resin to form a prepreg of the backside layer 3, and then punching for forming the intermediate layer 4 thereon. A metal is stacked, and a reinforcing fiber is further stacked thereon, and the reinforcing fiber is impregnated with a resin to form a prepreg of the surface layer 2. In the molding of the prepreg, the resin impregnated in the reinforcing fibers to form the back surface layer 3 enters the holes 5 of the punching metal due to the heavy pressure of the punching metal, or is reinforced to form the surface layer 2. The resin impregnated into the fibers drips into the holes 5 of the punching metal due to the weight of the resin, so that the resin for forming the surface layer 2 and the back surface layer 3 is filled in the holes 5 of the punching metal. Next, in such a state, the surface layer 2 and the back surface layer 3 are cured by a curing method (room temperature curing or heat curing) corresponding to the resin.
The structural panel 1 that is continuous through the holes 5 of the punched metal of the intermediate layer 4 can be formed.

In the case of molding by resin injection or resin transfer molding,
First, a reinforcing fiber for forming the backside layer 3 is arranged in a mold, a punching metal for forming the intermediate layer 3 is stacked thereon, and a surface layer 2 is further formed thereon. After laying the reinforcing fibers, the resin is pressed into the mold by clamping. The press-fitted resin is impregnated into the reinforcing fibers for forming the surface layer 2 and impregnated into the reinforcing fibers for forming the back layer 3 through the holes 5 of the punching metal. The holes 5 are also filled. Next, in such a state, the surface layer 2 and the back layer 3 are cured by a curing method (room temperature curing or heat curing) corresponding to the resin.
However, it is possible to form the structural panel 1 that is continuous through the holes 5 of the punching metal of the intermediate layer 4.

In such a molding, it is necessary to fill the holes 5 of the punching metal for forming the intermediate layer 3 with reinforcing fibers before laminating the surface layer 2 or the back layer 3. Is preferred. In the above-mentioned molding method, especially in resin injection and resin transfer molding, depending on molding conditions and the like, the surface layer 2
In some cases, only the resin for forming the back layer 3 penetrates into the holes 5 of the punched metal, and the reinforcing fibers hardly enter the holes 5. By filling, even if the surface layer 2
In addition, even if only the resin of the back layer 3 penetrates the holes 5 of the punched metal, the resin is impregnated into the reinforcing fibers already filled in the holes 5, so that such a problem is effectively prevented. be able to.

In any of the above-mentioned molding methods, the connecting portion 6 of the structural panel 1 of the embodiment shown in FIGS. What is necessary is just to shape and form the surface layer 2 and the back surface layer 3 according to this, and about the structural panel 1 of embodiment shown in FIG. 7 thru | or FIG. The peripheral end of the layer 4 may be shaped in a predetermined shape in advance, and at the time of molding, the intermediate layer 4 may be molded such that the peripheral end of the intermediate layer 4 is exposed from the surface layer 2 and the back surface layer 3. For the structural panel 1 of the embodiment shown in FIGS. 11 to 14, the plate-shaped punching metal is used as it is without shaping the peripheral end of the intermediate layer 4, and only the surface layer 2 and the rear surface layer 3 are predetermined. It should be bent in the shape of

The front layer 2, the back layer 3, and the intermediate layer 4
Are appropriately selected depending on the purpose and use. For example, when lightness is important, the thickness of the surface layer 2 and the back surface layer 3 is secured so that the rigidity of the structural panel 1 is ensured by reinforced plastic. The thickness of the intermediate layer 4 may be larger than the thickness of the intermediate layer 4, and when the strength is important, the thickness of the intermediate layer 4 is adjusted so that the rigidity of the structural panel 1 is ensured by punching metal. What is necessary is just to make it larger than the thickness of 2 and the back surface layer 3.

In the structural panel 1 of the embodiment described above, the resin for forming the front surface layer 2 and the back surface layer 3 is continuous with each other through the holes 5 of the punching metal during molding. The surface layer 2 and the back surface layer 3 are formed while the layer 2 and the back surface layer 3 and the punching metal are in close contact with each other while being supported by the punching metal. Therefore, for example, even without performing a surface treatment such as sand blasting, the resin is molded while ensuring sufficient dimensional stability and shape retention during curing shrinkage of the resin. In addition, the structural panel 1 having excellent corrosion resistance and chemical resistance and excellent dimensional stability can be realized at low cost.

When the holes 5 of the punching metal are filled with reinforcing fibers in advance, the holes 5 of the punching metal are surely filled with the fiber reinforced resin. Since it is molded in a state of being more closely adhered to the punching metal, the dimensional stability and shape retention during curing shrinkage of the fiber reinforced resin can be more sufficiently ensured, and therefore, with a simple configuration, Lighter and higher strength, excellent corrosion and chemical resistance,
Moreover, a structural panel having good dimensional stability can be realized at low cost.

In the structural panel 1 shown in FIGS. 2 to 6, the peripheral end of the structural panel 1 is used as a connecting portion 6 for connecting the structural panels 1 as it is. Each structural panel 1 can be connected with a simple configuration without providing the 6. In addition, since the punching metal made of steel is interposed in the connecting portion 6, the rigidity of the connecting portion of each structural panel 1 can be sufficiently increased. In particular, for example, as shown in FIG.
When the connecting portion 6 bent in a letter shape is fixed by bolts 9 and nuts 10, the bending moment acting on each free end portion 7 becomes extremely large. Therefore, sufficient strength can be ensured at the connection portion without designing such as increasing the thickness of each free end portion 7 as in the case of forming only with fiber reinforced plastic.

In the structural panel 1 shown in FIGS. 7 to 10, a part of the intermediate layer 4 is left as it is in each structural panel 1.
Are connected to each other, so that each structural panel 1 can be connected with a simple configuration without providing the connecting portion 6 separately. In addition, since the punching metal made of steel forms the connecting portion 6 as it is, the rigidity of the connecting portion of each structural panel 1 can be sufficiently increased. In particular, for example, as shown in FIG.
When the connecting portion 6 bent in a letter shape is fixed by the bolts 9 and the nuts 10, the bending moment acting on each free end portion 7 becomes very large. However, such connecting portion 6 is formed of steel. Therefore, sufficient strength can be ensured at the connecting portion without designing such as increasing the thickness of each free end portion 7 as in the case of forming with fiber reinforced plastic. In addition, in the structural panel 1 shown in FIGS. 7 to 10, the connecting portion of each structural panel 1 can be formed thinner than the structural panel 1 shown in FIGS. 2 to 6. Can be sufficiently increased.

Further, in the structural panel 1 shown in FIGS. 11 to 14, only the surface layer 2 and the back surface layer 3 at the peripheral end of the structural panel 1 are bent to form the connecting portion 6.
Is formed, there is no need to bend the rigid intermediate layer 4, that is, a plate-shaped punching metal can be used as it is, and the connecting portion 6 can be formed with a simple configuration.

Accordingly, the liquid storage tank 11 of the above-described embodiment uses a lightweight and high-strength structural panel 1 having good dimensional stability, so that the large liquid storage tank 11 can be used. Even if it is, it can be manufactured with high dimensional accuracy by simple assembly on site.

In the embodiment described above, when a plurality of structural panels 1 are connected on the same plane, for example, as shown in FIG. 2, FIG. 7 and FIG. Is bent in a substantially L-shaped cross section, but for example, a shape as shown in FIG. 15 may be used. That is, in the structural panel 1 shown in FIG. 15, the peripheral end portion is not bent at all, but is continuously formed in a plate shape. In order to connect the respective structural panels 1 on the same plane by the structural panel 1 shown in FIG. 15, as shown in FIG. In a state where the free ends 7 of the 6 are abutted with each other, an overlay layer 12 made of fiber reinforced plastic with a punching metal interposed is formed inside the free end 7, and the two abutted connecting portions 6 may be connected by covering them. .

Further, for example, one having a shape as shown in FIG. 17 may be used. That is, in the structural panel 1 shown in FIG. 17, the connecting portions 6 of the intermediate layer 4 protruding from both ends of the front surface layer 2 and the back surface layer 3 are substantially S-shaped along the longitudinal direction (lateral direction) of the intermediate layer 4. Each of the bent free ends 7 has a connecting bolt insertion hole 8 formed therein. Then, in order to connect the structural panels 1 on the same plane by the structural panel 1 shown in FIG. 17, as shown in FIG. The bolts 9 are inserted from the bolt insertion holes 8 of the one free end 7 to the bolt insertion holes 8 of the other free end 7 in a state where the free ends 7 of the 6 are overlapped in a vertical contact state. The connection may be made by fixing with a nut 10. In addition, an overlay layer 12 made of fiber reinforced plastic is formed on the inside and outside of the connecting portion, and by covering the connecting portion 6, corrosion of the connecting portion 6 made of steel is prevented and watertightness of the connecting portion is reduced. Secure.

Further, in the present invention, the connecting portion 6 is not limited to these shapes, but may be any shape as long as it can be connected to the connecting portions 6 adjacent to each other. It may be directly fixed to the connecting portion 6, and the connecting means may be, for example, welding or the like in addition to the connection using the bolt and the nut.

Further, regarding the shape of the structural panel 1,
The shape is not limited to a square plate shape, such as a rectangular plate shape and a circular plate shape, and may be a curved plate shape. Therefore, the assembled liquid storage tank 11
Is not limited to a rectangular box shape, but may be a cylindrical shape or the like. Furthermore, the structural panel of the present invention can be used without particular limitation even when assembling structures other than the liquid storage tank.

In the embodiment described above, the inside of the liquid storage tank 11 is used as the surface layer 2 and the outside is used as the back layer 3.
However, in the present invention, any one of the surface layer 2 and the back layer 3 may be used.
And the kind of resin of the back layer 3 may be appropriately selected,
Depending on the purpose and use, the type of the resin of the surface layer 2 and the type of the resin of the back surface layer 3 may be different.

[0047]

As described above, according to the first aspect of the present invention, at the time of molding, the surface layer and the back surface layer are supported by the punching metal in a state in which they are in good contact with the punching metal. Because it is molded while being processed, for example, without applying surface treatment such as sandblasting,
Dimensional stability and shape retention during curing shrinkage of the fiber reinforced resin can be sufficiently ensured. Therefore, with a simple configuration, it is possible to realize a structural panel that is lightweight, has high strength, is excellent in corrosion resistance and chemical resistance, and has good dimensional stability at low cost.

According to the second aspect of the present invention, since the fibrous reinforcing resin is reliably filled even in the holes of the punching metal, the surface layer and the back surface layer are in better contact with the punching metal. Molded. Therefore, the dimensional stability and shape retention during curing shrinkage of the fiber reinforced resin can be more sufficiently ensured, and therefore, with a simple configuration, it is lighter and stronger, and has excellent corrosion resistance and chemical resistance. Moreover, a structural panel having good dimensional stability can be realized at low cost.

According to the third aspect of the present invention, since the peripheral end of the structural panel is a connecting portion for connecting each structural panel as it is, there is no need to separately provide a connecting portion. With a simple configuration, each structural panel can be satisfactorily connected.

According to the fourth aspect of the present invention, since a part of the intermediate layer serves as a connecting portion for connecting each structural panel as it is, there is no need to provide a separate connecting portion and a simple structure. Thereby, the structural panels can be connected well. In addition, since the exposed portion of the steel punching metal forms the connecting portion as it is, the connecting portion can be formed thin, and the rigidity of the connecting portion of each structural panel can be sufficiently increased.

According to the fifth aspect of the present invention, the connection portion is formed by the intermediate layer without bending the rigid intermediate layer while securing the rigidity sufficiently. It is possible to realize a structural panel with a simple configuration and lower cost.

According to the sixth aspect of the present invention, a large liquid storage tank having excellent corrosion resistance and chemical resistance can be manufactured with simple assembly and high dimensional accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of a liquid storage tank of the present invention.

FIG. 2 is an AA view of one embodiment of the structural panel shown in FIG.
It is a line sectional view.

FIG. 3 is a conceptual diagram of a main part for describing an internal structure of the structural panel shown in FIG. 1;

FIG. 4 is a sectional view of one embodiment of the structural panel shown in FIG. 1;
It is a line expanded sectional view.

FIG. 5 is a cross-sectional view of one embodiment of the structural panel shown in FIG. 1;
It is a line sectional view.

FIG. 6 is a DD of one embodiment of the structural panel shown in FIG. 1;
It is a line expanded sectional view.

FIG. 7 is a cross-sectional view of another embodiment of the structural panel shown in FIG.
FIG. 3 is a sectional view taken along line A.

FIG. 8 is a cross-sectional view of another embodiment of the structural panel shown in FIG.
It is a B line expanded sectional view.

FIG. 9 is a cross-sectional view of another embodiment of the structural panel shown in FIG.
It is a C line sectional view.

FIG. 10 is a perspective view of another embodiment of the structural panel shown in FIG. 1;
FIG. 4 is an enlarged sectional view taken along line D.

FIG. 11 shows A of another embodiment of the structural panel shown in FIG.
FIG. 4 is a cross-sectional view taken along a line A.

FIG. 12 is a cross-sectional view of another embodiment of the structural panel shown in FIG.
FIG. 4 is an enlarged cross-sectional view taken along line B.

FIG. 13 shows another embodiment of the structural panel shown in FIG.
FIG. 4 is a sectional view taken along line C of FIG.

FIG. 14 shows another embodiment of the structural panel shown in FIG.
FIG. 4 is an enlarged sectional view taken along line D.

FIG. 15 is a side sectional view of a structural panel of an embodiment different from the structural panel of the embodiment shown in FIGS. 2, 7 and 11;

FIG. 16 is an enlarged sectional view showing a connection state of the structural panel of the embodiment shown in FIG.

FIG. 17 is a side cross-sectional view of a structural panel of an embodiment different from the structural panel of the embodiment shown in FIGS. 2, 7, 11 and 15;

18 is an enlarged cross-sectional view showing a connection state of the structural panel of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structural panel 2 Front layer 3 Back layer 4 Intermediate layer 5 Punched metal hole 6 Connection part 11 Liquid storage tank

Claims (6)

[Claims] 1. An intermediate layer made of a punched metal is interposed between a front layer and a back layer made of a fiber-reinforced plastic, and the front layer and the back layer are continuous through holes in the punched metal. A structural panel, characterized by being formed in the form of a panel. 2. An intermediate layer made of a punched metal is interposed between a front layer and a back layer made of a fiber reinforced plastic, wherein holes in the punched metal are filled with reinforcing fibers and And a structural panel, wherein the back surface layer is formed continuously through holes of the punching metal. 3. The structural component according to claim 1, wherein at least a part of the peripheral edge portion is a connecting portion that can be coupled to the peripheral edge portion of the structural panel adjacent to each other. panel. 4. At least a part of a peripheral end portion of the intermediate layer is exposed from the front surface layer and the back surface layer, and an exposed portion of the intermediate layer can be combined with an exposed portion of an adjacent intermediate layer. The structural panel according to claim 3, wherein the structural panel is the connecting portion. 5. At least a part of a peripheral end portion is formed only by the surface layer and the back surface layer without the intermediate layer being interposed, and formed only by the surface layer and the back surface layer. The portion is formed by bending, whereby the connecting portion is formed,
A structural panel according to claim 3. 6. A liquid storage tank which is assembled by the structural panel according to claim 1. Description: