JP2817669B2 - Method of strengthening composite plate, composite plate and formwork using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a composite plate obtained by laminating a plurality of plates, and a composite plate and a form material using the same. It is suitable.

[0002]

2. Description of the Related Art In the construction work of a building using concrete, when constructing a wall surface or a floor surface by casting concrete, a concrete casting form material (hereinafter referred to as a control panel) using a plate material in advance. Is assembled into a predetermined shape, concrete is poured along the control panel, and after the concrete is solidified, the control panel is removed to obtain an intended concrete casting surface. For this control panel, a veneer veneer is usually bonded with an adhesive, that is, a normal plywood is used. This is mainly to achieve a balance between weight reduction for ease of handling and on-site processing and high strength required since the control panel surface is directly a concrete casting surface. For example, in the case of constructing an outer wall of a building, the outer wall of the building is separated by a distance corresponding to a predetermined outer wall thickness.
A plurality of control panels are provided, concrete is poured between the two control panels and solidified, and after the solidification, the control panel is removed to obtain a desired concrete placing surface. At this time, in order to prevent the control panel from bending due to the weight of the concrete, a reinforcing material such as a square bar is usually backed.

[0003]

However, from the viewpoints of environmental protection and protection of forest resources in recent years, various alternative plywoods have been proposed and put into practical use in place of conventional plywood for the purpose of reducing the consumption of wood. . However, such alternative plywood has the following problems. As one of the alternative plywoods, there is a sandwich structure in which a foamable resin such as urethane is sandwiched between two wood veneers. When such alternative plywood is bent, compressive stress acts on the inner surface of the bend and tensile stress acts on the outer surface. And since the general wood veneer used for the substitute plywood does not have enough strength or elasticity to absorb this stress, the inner surface is bent and approaches the outer surface, and the outer surface is torn To try to absorb this stress, and eventually 2
Sometimes it breaks. Here, if bending stress can be absorbed in the thickness direction of the plywood when a bending stress is applied, a high-strength plywood that does not easily break or bend can be realized. However, the substitute plywood cannot absorb this stress at all because the inside is a foamable resin. Here, as a measure of strength, when comparing the Young's modulus of conventional ordinary plywood and the alternative plywood, the ordinary
In the alternative plywood, it is 30,000-35,000 kgf / cm ² , while it is 0000-70,000 kgf / cm ^2.
cm ² , indicating that the strength of the alternative plywood is extremely low. Here, the Young's modulus is R, the radius of curvature of the neutral plane of bending, M is the bending moment acting on the straight section, E is the Young's modulus, and the moment of inertia of the cross section around the intersection line between the cross section and the neutral plane. Assuming that I is a value obtained from the bending rigidity EI obtained by the following equation EI = MR.

Accordingly, when such an alternative plywood is used, many backing reinforcements are required to withstand the weight of the concrete. In this case, even if the consumption of timber is reduced as a control panel, the consumption of the backing reinforcing material is greatly increased, so that the consumption of the timber is increased. Moreover, since wood veneers are widely used for general alternative plywood due to requirements for workability such as nailing and strength, it has not been possible to further reduce the amount of wood used to zero.

Although the strength can be improved by providing a honeycomb structure between the two wood veneers, the cost is greatly increased, so that the feasibility is low.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional control panel and strengthens a composite board material capable of significantly increasing the strength as compared with the conventional alternative plywood while reducing the amount of wood used. It is an object of the present invention to provide a method, a composite plate material and a form material using the same. In the present invention, the particle size is larger than the interval between the plate materials between the plurality of plate materials.
Intervening inorganic porous particles including inorganic porous particles,
By filling and curing the synthetic resin in the gap generated between the plate materials, an external force acting to narrow the interval between the plate materials,
This can be realized by a method of reinforcing a composite member to be absorbed by the inorganic porous particles. And, as a composite plate material by this strengthening method, between these plate materials,
With inorganic porous particulates containing large inorganic porous particulates intervals by Rimotsubu diameter is interposed, the synthetic resin becomes filled structure into the gap occurring between the plate material, and as the form member, Between multiple plates, the particle size is larger than the interval between these plates.
The structure is such that the inorganic porous particles including the large inorganic porous particles are interposed, and the gap formed between the plate members is filled with the synthetic resin.

Hereinafter, the inorganic porous particles will be described.
As described above, the present invention, in a broad sense, by interposing a granular material between a plurality of plate members, when a bending stress is applied to the composite plate member, absorbs this stress in its thickness direction, thereby easily bending or bending. It is intended to realize a high-strength composite plate material without any trouble. Here, the following points are required as characteristics of the granular material. When the inner surface is bent due to the bending stress and a force is generated to approach the outer surface, the granular material has sufficient strength to absorb the stress. For this,
This is naturally required in terms of stress absorption. When the inner surface is bent due to bending stress and a force is generated to approach the outer surface, the granular material does not penetrate into the plate material to break through the plate material. Regarding this, it is clear that if the granular material itself has a pointed portion or is a very hard material, no matter how high the strength of itself, it does not lead to improvement in the strength of the composite plate as a whole. is there. However, since this point is determined by the balance with the strength and hardness of the plate material, it is not determined only by the physical properties of the granular material. There is no weight increase due to the interposition of granular materials. From the viewpoint of the actual working conditions at the construction site, the fact that it is heavier than the current ordinary plywood and alternative plywood reduces the workability,
Of course, it must not be. Excellent compatibility with the synthetic resin to be filled. If the familiarity with the synthetic resin filled between the granular material and the plate material is poor, as a result, the adhesiveness between the granular material and the synthetic resin is reduced,
There will be a gap between the two. As described above, when a gap is formed, stress concentrates on the portion, and the portion is eventually broken into two. Also, as described above, the interval between these plate materials
Inorganic porous containing inorganic porous particles with a larger particle size than
Granules are interposed, and appropriate pressure is applied to the surface of both plates
Large inorganic porous granules
To some extent to increase the contact area between the plates
Can be.

In order to satisfy the above conditions, the following physical properties are required as a granular material. A) By having a large contact area with the plate material when the powder has sufficient mechanical strength as a granular material, and at least when the inner surface is bent due to bending stress and a force to approach the outer surface is generated. Have a shape that does not break into the plate material and break through the plate material. Alternatively, it must have physical properties such that the contact area can be increased by a certain degree of deformation when the above-mentioned force is applied. And, as described above, the physical properties of the granular material must be compatible with the physical properties of materials generally used as plate materials from wood to metal and the like. B) Density or apparent density that does not increase the weight of plywood. C) The contact area with the synthetic resin must be large.

Therefore, in the present invention, the inorganic porous granular material is selected as having the above-mentioned physical properties (a), (a) and (c).

The following can be exemplified as each material that can be used in the present invention. First, as a plate material, a wood plate, a bamboo plate, a metal plate or a reinforced synthetic resin plate, or a plate material using wood and a synthetic resin can be used. Here, the wood board is made from veneer (single veneer), laminated plywood, fiber materials such as straw or wood, waste pulp from papermaking, etc. as raw materials.
A fiberboard or the like made into a plate by adding an adhesive or the like to this can be exemplified. Here, as plywood, JAS (Japanese Agricultural Standards)
Plywood, special plywood, structural plywood, concrete formwork plywood, scaffold plywood, flame-retardant plywood, fire door plywood, etc.

As the bamboo plate, a single plate obtained by thermocompression bonding and molding a long or chip-shaped bamboo material using an adhesive such as a phenol resin, or a plurality of such single plates are laminated so that their fiber directions intersect. Similarly, a laminated plate thermocompressed and molded using an adhesive such as a phenol resin, or a single plate or a laminated plate laminated with melamine-impregnated paper or a single veneer alone or in combination is exemplified. it can.

As the metal plate, a plate made of a material having a certain degree of strength or a general steel plate can be used. Examples include steel sheets for products and surface-treated steel sheets.

As the reinforced synthetic resin plate, those reinforced with various fiber materials can be used, and carbon fibers, aramid fibers, polyethylene fibers, polyarylate fibers, alumina fibers, silicon carbide fibers, silicon nitride fibers are used as the reinforcing fibers. Fibers, boron fibers, glass fibers and the like can be used.

Further, when used as a composite board in building materials and the like, a colored zinc plated steel sheet certified as Noncombustible No. 1041, a vinyl chloride resin metal laminated board certified as Noncombustible No. 1052, a noncombustible (roof) 1001)
No. 1131 (colored aluminum), non-combustible No. 1141 (color aluminum) and non-combustible No. 1142 (color aluminum) S) Colored aluminum, non-combustible No. 1006 (painted stainless steel sheet) and non-combustible No. 1026 (vibration damping stainless steel sheet) stainless steel sheet, non-combustible No. 1017 (asbestos calcium silicate plate backing enamel) Examples thereof include an enameled steel sheet certified as No. 1018 (enameled steel sheet) and noncombustible No. 1018 (enameled steel sheet), and a titanium wrought material approved as noncombustible No. 1019.

[0015] As for the plate material using wood and synthetic resin, for example, waste wood and waste material of vinyl chloride resin are crushed,
After being melted at a high temperature, it is poured into a molding die and extruded at a high pressure to form a plate.In addition to waste vinyl chloride resin, automobile waste such as polyethylene terephthalate, polycarbonate, polypropylene, and paint Synthetic resin waste such as sludge can be exemplified.

As the inorganic porous granular material, the above-mentioned a), a), and
Any material having the physical properties of c) can be used and is not particularly limited, but specifically, those having the following physical properties are suitable. In order to provide the above physical properties (a), (a) and (c), the present invention uses an inorganic porous granular material.
In order to be porous, the apparent density of the granular material must be lower than the true density. However, in practice, many inorganic porous materials are obtained by sintering powder after granulation, or pressing and molding powder to form granules. If there are no voids in the interior, the physical properties described in a) above cannot be obtained, and therefore, it is desirable to set the apparent density within a range of about 1% to 80% of the true density. Specific materials include the following.

For example, gyrolite-type crystal CaO,
A granulated body of calcium silicate powder containing SiO ₂ as a main component, having a diameter of 1 mm or more, arbitrarily set, a true density of about 2.52 g / cm ³ and an apparent density of 0.1 to 0.3 g / cm ^3.
About ³ cm3.

A granular material obtained by granulating coal ash powder collected after burning in a coal boiler or the like after granulating it with water or the like, and forming SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , and Na ₂ O. ,
It contains components such as K ₂ O, CaO, and MgO, and has a true density of about 3
g / cm ³ or more, the apparent density is 1.3 to 1.4 g / cm
^{About 3} things.

Heat treatment of natural shale and day rock to remove moisture content to make the shale and day rock porous and to make the apparent density 1.1 to 1.0
It is about 1.4 g / cm ³ .

Naturally occurring zeolite family minerals such as analcite (meteorite), fudanite (pyroxene), stillbalt (bazite), natrolite (sodalite), tomsonite (tomsonite), rhomontite (turbite). (Tectosilicate mineral) as it is, heat-treated as it is or fired after granulation of the powder to make it porous by removing the water content.

[0021] A powder obtained by crushing the skin of a seed of a grass plant such as a rice husk into a powder form, and then pressing it into a granular shape. In particular, since rice hulls contain about 10% of a silicon component, if they are formed into granules by pressure molding, relatively high mechanical strength can be obtained.

The porous volcanic ejecta and its powder are granulated and
Regardless of whether they are molded, or other natural or artificial products, they are granular materials made of inorganic materials and have an apparent density lower than the true density.

Here, the foamable synthetic resin includes polystyrene foam, polyethylene foam, rigid polyurethane foam, flexible polyurethane foam, rigid vinyl chloride foam, urea foam, phenol foam, acrylic foam, cellulose acetate foam, and other plastic foams. Can be illustrated. As a method for obtaining a foam, generally known methods can be applied. As examples, three types of foaming methods of polyurethane foam, urea foam, and phenol foam are listed below as typical examples.

The polyurethane foam is obtained from raw materials such as a polyol, an excess diisocyanate, a cross-linking agent, a foaming agent, a catalyst, and a cell size adjusting agent.
Other decomposable organic foaming agents such as freon, methylene dichloride, pentane, air introduced during mechanical mixing, and the like are used. When water is used as the cross-linking agent and the foaming agent, the ratio of urea bonds in the resin increases, so that a combination of Freon and the like is preferable to obtain a good-quality foam. Silicone resins and emulsifiers can be used for the cell size regulator, and amines and organotin compounds can be used for the catalyst.

For urea foam, the viscosity is 100
To 100 parts of a viscous urea-formaldehyde aqueous solution (resin content: 50 to 90%) of about 0 cp, 2 to 30 parts of a foaming agent such as propane, butane, butene, hexane, methyl chloride, and freon are added at a low temperature or in a closed container. Disperse,
After adding the acid catalyst in the presence of the emulsifier, the temperature is raised to 15-115 [deg.] C to obtain. Alternatively, the urea resin precondensate containing an emulsifier may be discharged while mechanically foaming while mixing a hydrochloric acid solution with an in-situ foaming machine.

The phenol foam is obtained by mixing a curing agent under stirring and applying or filling the target portion while creaming while blowing air into the resol type initial condensate with a whisk. Further, about 1% of sodium bicarbonate may be added when creaming to help foaming. According to this method, the composition is quickly cured after the addition of the curing agent, and becomes a foam having a density of about 0.016 to 0.401 g / cm ³ . As the oxidation catalyst, benzenesulfonic acid, toluenesulfonic acid, sulfuric acid, phosphoric acid, or the like is used. If a volatile foaming agent such as Freon 11 is blended, foaming is caused by the heat of reaction, so that initial foaming is not required. Also Bak
Phenolic resins suitable for foaming, such as elite's BVR-18873, are also commercially available, but a tough foam is produced by copolymerizing 5 parts of polyamide obtained from adipic acid and hexamethylenediamine with 85 parts of resole. Polyvinyl alcohol, vinyl chloride resin can be 5 to 5
About 20 parts can be blended to supplement toughness, elasticity and the like. In general, when a thermosetting resin is foamed at a high magnification, it becomes brittle, so that it may be foamed at a low magnification of 10 times or less.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The composite plate material and the formwork material according to the present invention are made of the above-mentioned materials, inorganic porous particles are interposed between a plurality of plate materials, and synthetic resin is filled in a gap formed between the plate materials. Is filled. That is, the plate material has a structure in which the inorganic porous granular material and the synthetic resin are sandwiched. According to the present invention, a), b), and
The physical properties of c) are satisfied by the inorganic porous granules, and as a result, the following properties are obtained. That is, the inorganic porous granular material is literally porous, has a rough inner surface, and has a strength capable of sufficiently absorbing stress, and thus directly contributes to improving the bending strength of the composite plate material. In addition, by filling the gap generated between the plate materials with the synthetic resin, the interposed inorganic porous granular material is prevented from falling, and a plurality of the plate materials are bonded to each other to form a single composite plate material. As a result, the consumption of wood is reduced, and the shear strength of the composite board is further improved. The inorganic porous granular material absorbs the stress by the following action when a force that bends the inner surface to approach the outer surface is generated by the bending stress in the composite plate material. Along with the generation of the stress, the inorganic porous granular material is subjected to a force for crushing itself. However, since the inorganic porous granular material is an inorganic material, it has sufficient strength by itself and does not easily collapse. However, when a larger force is applied, the inorganic porous granular material itself is crushed, but at this time, the external force is absorbed by crushing the void existing on the rough inner surface, and the entire inorganic porous granular material is Large changes in shape are unlikely to occur. In addition, since the contact area with the plate is increased with a slight change in the outer shape due to the collapse of the void, the inorganic porous particles do not sink into the plate or break through the plate.

Further, since the inorganic porous granular material is porous, a large contact area with the synthetic resin to be filled can be obtained, so that the familiarity between the two is improved and the adhesiveness is improved. As a result, no gap is formed between the granular material and the synthetic resin, and when bending stress or shear stress is applied, stress is not concentrated in one place, and strength can be improved. Become.

Next, the embodiment of the present invention will be described in detail. FIG. 1 shows a partial cross-sectional view of a composite plate 1 of the present invention configured as a control panel. In the illustrated example, the inorganic porous particles 5, 5a, 5b are interposed between two plate members 3a, 3b, and these plate members 3a, 3b are interposed.
The gap between a and 3b is filled with the synthetic resin 7. A frame member 11 having a locking portion 9 for preventing the composite board 1 from coming off is mounted on the end face of the composite board 1 to prevent the end face from flowing out from the end face when the end face is finished and the synthetic resin 7 is filled. The frame member 11 is also preferably made of a synthetic resin having an appropriate strength from the viewpoint of weight reduction, but it goes without saying that other materials can be appropriately selected. Also, the relationship between the thickness of the plate members 3a, 3b and the outer diameter of the inorganic porous particulate matter 5, 5a, 5b, the interposing density thereof, and the like are merely examples in the embodiment. It is not limited in any way by the illustrated example.

The composite board 1 is manufactured by the following procedure. The following manufacturing process is an example of a control panel and will be described with reference to FIG.
First, a sheet material 3b is laid in a jig 15 having a depth of the entire thickness of the control panel and a frame member 11 is mounted on an outer peripheral portion thereof along an inner side surface 17 of the jig 15. In this state, the end of the plate 3b is brought into contact with the step 13 of the frame member 11 shown in FIG. Also, the frame member 11
An injection port 19 for injecting the synthetic resin 7 later is provided in at least one of the positions.

Next, the inorganic porous granules 5, 5a, 5b are spread on the surface of the plate 3b at an appropriate density. At this time, the amount and density of the inorganic porous particulate matter 5, 5a, 5b become important. That is, the inorganic porous granular materials 5, 5a, 5
When b is unevenly distributed, in a portion where the density is low, the strength of the control panel is reduced as described in the above section of the operation. Therefore, the inorganic porous particles 5, 5a, 5
It is desirable that b be randomly scattered or regularly scattered at substantially constant intervals. In order to sprinkle randomly, uneven distribution can be prevented by using, for example, a sieve, and in order to sprinkle regularly, a net having approximately the same size as the plate material 3b is spread within a range that does not hinder the fluidity of the synthetic resin 7 to be injected later. In addition, for example, a method of dropping the inorganic porous particulates 5, 5a, 5b into the mesh while vibrating the whole is possible. Further, as another method for regularly sowing, a jig 15 in which the plate member 3b and the frame member 11 are loaded is used.
Are moved in the direction of the long side thereof, and are arranged in a line in the direction of the short side by, for example, an appropriate supply means.
It is also possible to drop a and 5b. When the inorganic porous granular materials 5, 5a, 5b are spread, the plate material 3b
An adhesive substance such as an adhesive may be applied to the surface of the plate member 3b so that the inorganic porous particles 5, 5a, 5b do not roll due to the inclination or the like.

[0032]

Here, as an embodiment of the control panel, for example, plate members 3a and 3b each having a size of 1800 mm × 600 mm and a thickness of 3 mm and made of plywood laminated with veneers, and an apparent density of 1.3 to 1.4 g / Using inorganic porous granular materials 5, 5a, 5b of about ³ cm ³ , the gap between the plate members 3a, 3b is 6 m.
In the case of m, 1.2 kg of the inorganic porous granular material 5, 5a, 5b having a particle size of 5 mm to 7 mm is preferably scattered. The size of the control panel is 1800 mm x 900
There are various sizes including mm, and the amount to be spread may be appropriately set according to the combination of these areas, the fluidity of the injected synthetic resin 7, and the like.

Subsequently, the inorganic porous granules 5, 5a,
Another plate 3a is placed on the plate 3b on which 5b is scattered. At this time, the end of the plate member 3a is also connected to the frame member 1 shown in FIG.
It is in a state of being placed on the first step portion 13.

Next, the jig 1 is placed on the plate 3a.
5 is set in a pressurizing device, and an inflow port for the synthetic resin 7 is secured, and a frame member 11 is mounted on the end face. The foamable synthetic resin described above as a synthetic resin is injected from the injection port 19 provided in the frame member 11 while applying appropriate pressure to the surfaces of the two plate members 3a and 3b by a pressurizing device. The gap between 3a and 3b is filled. Here, polyurethane foam is easy to handle as a synthetic resin, and when filling polyurethane foam, it is preferable to inject the base material and the foaming agent while mixing them with a mixing nozzle or the like. It is also conceivable that the injection of the synthetic resin 7 pushes the inorganic porous granules 5, 5a, 5b farther from the inlet 19, but the inorganic porous granules 5, 5a, 5 5b, as described in the section of the means for solving the above-mentioned problem, is not porous, and thus has a non-smooth surface. Therefore, the shape is not a true sphere, and it is not easily pushed or moved by an appropriate hook between the surfaces of the plate members 3a and 3b. In order to achieve such an effect, the plate material 3 made of plywood in which veneers are stacked is used.
When the interval between a and 3b is set to 6 mm, as described above, the inorganic porous granules 5, 5a, and 5 having a particle size of 5 mm to 7 mm are used.
It is preferable to use b. The foamable synthetic resin may be any of a foamed resin injected while foaming, a foamed resin after injection, and a foamed resin before injection.

When the pressure is applied, some or all of the inorganic porous granular materials 5, 5a, 5b may be crushed to some extent to increase the contact area with the plate material 3. According to this, for example, as shown in the figure, for example, the gap between the two plate members 3 is substantially the same as the particle size of the inorganic porous granular material 5, and the large-diameter inorganic porous granular material 5a is pressed by pressure. The structure is such that a part thereof is crushed and the contact area with the plate members 3a and 3b is increased.

The control of the gap between the two plate members 3a and 3b can be performed by separately providing a suitable gap control means on the outer peripheral portion or the like. For example, as shown in the example of FIG.
Can be used as this gap control means, and as a gap control means, a separate spacer (not shown) may be arranged on the inner surfaces of the plate members 3a and 3b at an appropriate density and spacing. it can.

However, as still another method of controlling the gap, as described above, the inorganic porous particles 5, 5a, 5b
Is classified to some extent so as to have a particle size distribution of, for example, 5 mm to 7 mm, and a small amount of the large-sized inorganic porous granular material 5a mixed therein is crushed at the time of pressurization as described above. Depending on the average diameter of the inorganic porous granular material 5,
The gap between a and 3b can also be controlled. This is because most of the inorganic porous granules having the average diameter have a high ratio of those having the average diameter because the inorganic porous granules are classified, so that a small amount of the large-diameter inorganic porous granules 5a are crushed. The object 5 utilizes the fact that there are many points of contact with the plate members 3a and 3b so that the object 5 is not easily crushed. Further, in the case where a plate made of plywood obtained by stacking veneers on the plate members 3a and 3b is used, and this method is employed, even if the large-diameter inorganic porous granular material 5a is embedded in the plate members 3a and 3b, the large-diameter inorganic There is no problem if the porous granular material 5a breaks through the plate members 3a and 3b and is exposed from the surfaces thereof, or if the surfaces of the plate members 3a and 3b are not significantly uneven. Rather, it is desirable that a slight amount of indentation be generated because the contact area between the inorganic porous granular material 5a and the plate members 3a and 3b can be increased. Therefore, when the particle size distribution of the inorganic porous granular material 5 is extremely uniform, it is considered that almost all of the inorganic porous granular material 5 is slightly weighed into the plate members 3a and 3b. On the other hand, there is a case where the inorganic porous granular material 5b having a smaller diameter than the average diameter is mixed, but there is no particular problem if the mixing ratio is low.

Then, the synthetic resin 7 is kept under pressure for a certain period of time until the foaming and hardening of the synthetic resin 7 is completed, and the plate members 3a, 3b and the synthetic resin 7 are integrally bonded. Finally, the injection port of the synthetic resin 7 is closed as required, and a release material from which concrete is easily peeled off is applied or adhered to the surface as needed, thereby completing the control panel. Here, the application and affixing operation of the release material may be performed in advance before setting the plate materials 3a and 3b on the jig 15. In this example, the plate members 3a,
Although an example using two 3b is shown, it goes without saying that three or more can be used.

The composite plate 1 of the present invention (having a thickness of 3
mm of veneer is stacked between two plywoods, and an inorganic porous granular material 5 having an apparent density of 1.3 to 1.4 g / cm ³ and a particle size of 5 to 7 mm is applied at a density of 1.1 kg / m ² . Sprinkle,
Polyurethane foam filled to 0.83 kg / m ² ) was compared with a conventional product. As a result, it became 42,620-57,140 kgf / cm ² , and it was confirmed that the strength was significantly improved as compared with the conventional alternative plywood. This value is slightly inferior to the conventional ordinary plywood, but superior to the conventional alternative plywood. The backing reinforcing material (bar member described later) required when using the composite plywood of the present invention requires a little extra compared to conventional ordinary plywood, but requires less than the alternative plywood. In terms of cost, the use of ordinary plywood was comparable to that of conventional plywood, and it was confirmed that the cost was significantly reduced as compared with the use of alternative plywood.

When the present invention is used as a concrete frame material (control panel), it is conceivable to attach the cross member 21 to the back surface as shown in FIG. This is installed to prevent the board from bending when the concrete is poured. In the illustrated example, the nail 2
By hitting 3, the main structure of the formwork 25 in which the crosspiece 21 is fixed to the composite board 1 is shown. FIG. 4 is a plan view of the crosspiece 21 viewed from the mounting side, in which the crosspiece 21 is mounted around the composite plate 1 and in the plane. At this time, as shown in FIG. 3, the step portions 13 of all the frame members 11 are made longer, and the composite plate 1
If the nail 23 that penetrates through the step portion, it is possible to more reliably prevent the frame member 11 from falling off, and even if the form material 25 is handled with a little rough handling, the form material 25 Does not break easily. Therefore, it is based on the actual condition of the construction site. Further, as shown in FIG. 5, a wood screw 27 may be used instead of the nail 23. As for the material of the crosspiece member 21, synthetic resin is preferable in view of repeated use and cost. For example, extrusion molding may be performed using a material such as polypropylene, polyamide, polyvinyl chloride, or polyethylene to form a rod having a hollow structure as shown in FIG. With the hollow structure, the crosspiece member 21 is lightweight and has high strength. If this synthetic resin is foamed, further weight reduction and cost reduction can be achieved. A preferable range of the expansion ratio is 1.3 times to 1.6 times.
If it is smaller than this, the weight increases and the cost also increases. Conversely, if it is larger than this, the strength decreases, which is not preferable. In addition, when the direct sunlight of midsummer shines on the beam member 21, the temperature of the beam itself rises to 50 to 60 ° C, and there is a concern that the strength may be reduced or deformed. Therefore, in order to prevent this, a filler such as mica, glass fiber, carbon fiber or the like may be included in the synthetic resin.

[0041]

As described above, according to the present invention, the following excellent effects can be obtained. When an inorganic porous granular material is interposed between a plurality of sheet materials, when a force is generated that causes the inner surface to bend and approach the outer surface due to bending stress, a) increase the contact area with the sheet material B) Also, the contact area can be increased by a certain degree of deformation of the inorganic porous granular material itself when the above-mentioned force is applied, and c) further filling Due to the main function of having excellent adhesiveness to the synthetic resin, the strength of the composite plate material can be greatly improved. Therefore, according to the present invention, the number of repetitive use as a formwork material (panel) for concrete casting is greatly increased, so that the running cost is significantly lower than that of conventional ordinary plywood. Further, compared with the conventional alternative plywood, the number of backing reinforcing materials is reduced, resulting in a significant cost reduction. As described above, since it is excellent in strength, the number of times of repeated use is increased, so that it is significant in terms of effective use of resources and extremely social. In addition, high strength can be obtained by inorganic porous granules even if strength is not obtained by plate materials such as bamboo board and fiber board alone, and nails due to high hardness such as board materials and metal plates using wood and synthetic resin. Even if the material is difficult to pass through, it is possible to use a thin plate through which nails can easily pass, and it is possible to compensate for the decrease in strength due to the use of the thin plate with the inorganic porous granular material. growing. At the same time, this leads to a reduction in the consumption of timber resources, which is extremely significant from the viewpoint of nature conservation. Furthermore, the present invention is not limited to the mere reuse of industrial waste, but also has the aspect of creating another new value from industrial waste. It is something with. The present invention can be applied to a wide range of uses such as building materials, bookshelves and other heavy shelves, and office equipment, and can obtain extremely high strength while having the same thickness as the conventional one. Yes, and its use is very extensive.

[Brief description of the drawings]

FIG. 1 is a sectional view of a principal part for explanation showing a structural example of a composite plate material of the present invention.

FIG. 2 is an exploded perspective view for explaining a method of manufacturing a composite plate according to the present invention.

FIG. 3 is a cross-sectional view of a main part for explanation showing an example of the structure of a form material of the present invention.

FIG. 4 is an explanatory view showing a structural example of a form material of the present invention.

FIG. 5 is a cross-sectional view of a main part for explanation showing a structural example of a form material of the present invention.

FIG. 6 is an explanatory view showing the structure of a cross member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite board material 3a, 3b Board material 5, 5a, 5b Inorganic porous granular material 7 Synthetic resin 9 Locking part 11 Frame member 13 Step part 15 Jig 17 Inner surface of jig 19 Injection port 21 Bar member 23 Nail 25 Form Material 27 Wood screw

Claims (3)

(57) [Claims] 1. The method according to claim 1, wherein the distance between the plurality of plate members is a distance between the plate members .
By interposing inorganic porous granules including inorganic porous granules having a large particle size, filling the gaps between the plate materials with synthetic resin and curing, the external force acting to narrow the space between the plate materials is reduced. And a method for reinforcing a composite member to be absorbed by the inorganic porous granular material. 2. The method according to claim 1, wherein a distance between the plurality of plate members is equal to a distance between the plate members .
A composite plate material comprising an inorganic porous granular material including an inorganic porous granular material having a large particle size, and a synthetic resin filled in a gap formed between the plate materials. 3. The method according to claim 1, wherein a distance between the plurality of plate members is determined.
A mold material characterized in that an inorganic porous granular material including an inorganic porous granular material having a large particle size is interposed and a gap formed between plate materials is filled with a synthetic resin.