JPH0723539U - Architectural panel - Google Patents

Abstract

(57) [Summary] [Purpose] Lightweight and strong, easy to handle when transporting or removing after placing concrete, the skin surface of the concrete layer can be satisfactorily finished, and repair is easy and repeated use is possible. Provide a concrete formwork panel with a long service life. [Structure] A laminate 1 is formed by a core material layer 12 made of a thermosetting synthetic resin foam and a reinforcing layer 13 made of a synthetic resin layer reinforced by glass fibers. An outer skin layer 14 made of wax or a thermoplastic resin is formed on the surface of the reinforcing layer 13. Since the magnitude of the bending strength can be changed by adjusting the density of the thermosetting synthetic resin foam, it is possible to provide the bending strength suitable as a concrete formwork panel or other building materials.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a building panel that can be used as a building material such as a concrete formwork.

[0002]

[Prior art]

 Conventionally, plywood with a thickness of about 12 mm (veneer plywood) has been commonly used for concrete formwork as a building material, but this product is notable for corrosion deterioration and damage after repeated use 2-3 times. It is obliged to dispose of it, and it is said that it is not in line with the recent trend toward resource conservation.

On the other hand, FRP panels for concrete formwork are known from Japanese Utility Model Publication No. 58-156839. This FRP panel can exhibit the same bending strength as that of the above plywood when its thickness is made equal to that of the above plywood. However, since the FRP panel is heavy for its thickness, it is difficult to handle.

Therefore, the applicant of the present application has proposed, in Japanese Patent Application No. 3-17718, a concrete formwork panel in which a synthetic resin layer containing glass fibers is formed into a porous structure having open cells. According to this product, the weight can be reduced by the porous synthetic resin layer, the weight is lighter than the thickness, and the handleability is remarkably improved from the FRP panel described above in terms of weight, and at the same time, it is equivalent to the above plywood. It was possible to satisfy the strength required for the concrete formwork when the thickness was set, that is, the same strength as the plywood. This revealed that the panel for concrete formwork proposed by Japanese Utility Model Application No. 3-17718 can be used as a substitute for plywood.

The glass fiber-containing synthetic resin layer used in this panel contains glass short fibers throughout and is manufactured by the following method. That is, a powdered or granular thermoplastic resin such as polypropylene or polyethylene, a glass short fiber, a foaming agent and water are mixed to prepare a foam dispersion liquid in which fine bubbles are dispersed. The liquid is dehydrated by making paper on a porous support such as a net in the same way as paper making used in the papermaking field, drying the resulting sheet, laminating the required number of sheets, and hot pressing to solidify. Then, a non-breathable sheet body is obtained, and the non-breathable sheet body is reheated to be thermally expanded and pressed in a mold to perform stamping molding. In this stamping molding process, the sheet bodies laminated in the mold are fused and integrated, and at the same time, the glass short fibers that are forcibly compressed and deformed by the solidification after the hot pressing are restored to some extent. Due to the restoration of such short glass fibers, the synthetic resin forming the sheet expands following the deformation of the glass fibers. By undergoing such a process, the sheet body is molded to have a constant thickness and shape smaller than the thickness when it is freely expanded without restriction, and the synthetic resin layer has a large number of thin open cells communicating with the front and back. It becomes porous.

[0006]

[Problems to be solved by the device]

 However, the concrete formwork panel proposed by the applicant of the present application in Japanese Patent Application No. 3-17718 is manufactured through the complicated and special process as described above, and the manufacturing cost is high. was there. In addition, there was a limit to the weight reduction to obtain the same strength as plywood, and there was still room for improvement.

The present invention has been made in view of the above problems. Although it has the same strength as the concrete formwork panel previously proposed by the applicant of the present invention, it is cheaper in manufacturing cost. It is an object of the present invention to provide a construction panel that can be used as various building materials by promoting the reduction of weight and weight and can be a substitute for the plywood explained at the beginning when it is used as a panel for concrete formwork.

[0008]

[Means for Solving the Problems]

 The construction panel of the invention according to claim 1 is a reinforcement made of a synthetic resin containing reinforcing fibers such as glass fibers on both sides of a core material layer made of a thermosetting synthetic resin foam such as a urethane resin foam. It is a laminated body in which the layers are laminated and integrated.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the construction panel has an outer skin layer formed of a synthetic resin layer containing no reinforcing fibers or a coating layer on the surface of the reinforcement layer. It is something that

According to a third aspect of the construction panel of the invention, in the first aspect or the second aspect, the laminated body is surrounded by a frame body arranged at an outer peripheral edge portion thereof. It is a thing.

[0011]

[Action]

 In the construction panel according to the first aspect of the present invention, the core material layer exhibits heat insulating properties, and the core material layer and the reinforcing layer each exhibit large bending strength, whereby the bending strength as a whole is enhanced. Since the fiber-reinforced reinforcing layer may be non-foamed, a kind of powdered or granular thermoplastic resin, glass short fibers, a foaming agent, and water are mixed to form a foam in which fine bubbles are dispersed. A dispersion liquid is prepared, and the foamed dispersion liquid is made on a porous support such as a net and dehydrated in the same manner as in papermaking in the papermaking field. After drying the obtained sheet body, one sheet or By simply undergoing the process of stacking a plurality of sheets, heat-pressing them and continuously solidifying to obtain a non-breathable sheet body, it becomes possible to manufacture without the stamping molding mentioned above, which is the core material. Combined with the use of thermosetting synthetic resin foam, which is cheaper than a reinforcing layer such as urethane resin foam in the layer, it helps to reduce the manufacturing cost.

Further, since the core material layer, which occupies most of the weight of the entire panel, is made of the thermosetting synthetic resin foam which is light in itself, the weight is reduced as a whole.

In the building panel of the invention according to the second aspect, since the outer layer of the synthetic resin layer containing no reinforcing fiber or the coating layer is formed on the surface of the reinforcing layer, the outer layer is used to supplement the outer layer. The exposed reinforcing fibers are coated on the surface of the strong layer. Therefore, when this panel is used as a concrete form panel, the outer layer prevents the concrete layer from anchoring the reinforcing fibers in the reinforcement layer, and the panel is separated from the concrete layer. Not only is the property improved, but the surface of the outer skin layer becomes the mold surface, and the skin surface of the concrete layer is finished smoothly.

In the building panel according to the third aspect of the present invention, the impact applied to the laminated body including the core material layer and the reinforcing layer when dropped from a high place is applied to the outer peripheral edge portion of the laminated body. It is relieved by the frame body arranged at.

[0015]

【Example】

 FIG. 1 is a schematic perspective view of a building panel P according to an embodiment of the invention of claims 1 and 3, FIG. 2 is an explanatory view showing a cross section with the panel partially omitted, and FIG. FIG. 4 is a partially enlarged explanatory view, FIG. 4 is a schematic perspective view of a building panel P according to an embodiment of the invention of claims 2 and 3, and FIG. 5 is an exploded perspective view showing corner members and side members of a frame body. FIG. 6 is an exploded perspective view showing a modified example of a corner member, and FIG. 7 is an explanatory view showing an example of a method for manufacturing a laminated body.

In FIG. 1, reference numeral 1 is a laminated body, and 2 is a frame body which is arranged at an outer peripheral edge portion of the laminated body 1 and surrounds the laminated body 1.

As shown in FIG. 2, the laminated body 1 is composed of a core material layer 12 having a rectangular shape in plan view and reinforcing layers 13 and 13 laminated and integrated on both surfaces of the core material layer 12. The core layer 12 is made of thermosetting synthetic resin foam. As the thermosetting synthetic resin foam for forming the core material layer 12, urethane resin foam can be preferably used, and as an alternative, epoxy resin foam or the like can be used. The reinforcing layer 13 is made of synthetic resin containing reinforcing fibers, and the glass fibers used as the reinforcing fibers in this embodiment are short glass fibers having a short fiber length. The reinforcing fibers include short glass fibers and carbon fibers. It is possible to use various reinforcing fibers such as stainless steel fiber and copper fiber. It is also possible to use a continuous mat in which long glass fibers are spirally wound and laminated.

The reinforcing layer 13 has a composition similar to that of the fiber-reinforced plastic structure proposed in JP-A-60-158227. As the reinforcing layer 13 containing short glass fibers, it is possible to use the one manufactured by the method according to the manufacturing method of the publication. That is, a powdery or granular thermoplastic resin, glass short fibers, a foaming agent, and water are mixed to prepare a foaming dispersion liquid in which fine bubbles are dispersed, and the foaming dispersion liquid is used in the papermaking field. It is preferable to use, as the reinforcing layer 13, a non-breathable sheet body obtained by making a sheet body on a porous support such as a net, dehydrating the sheet body in the same manner as the paper making, drying the obtained sheet body, and then continuously solidifying it by hot pressing. it can. When the reinforcing layer 13 having a large thickness is obtained, a plurality of sheet bodies are laminated and heat-pressed to form a non-breathable sheet body having a required thickness, and the non-breathable sheet body is formed from the non-breathable sheet body. Can be used for. In addition, it is also possible to use an extruded sheet body in which a resin and glass short fibers are mixed.

The synthetic resin plate (described later) for forming the reinforcing layer 13 thus obtained is non-foamed, has excellent bending strength, and has impact resistance improved by the reinforcing fiber. As the synthetic resin for forming the reinforcing layer 13, a thermoplastic resin such as polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate or nylon can be used. When these thermoplastic resins are used, the lightweightness of the building panel P is maintained, and when the panel P is used as a concrete formwork panel, the surface of the reinforcing layer 13 that serves as a mold surface. The peelability between the concrete and the concrete layer becomes good. When glass short fibers are used as the reinforcing fibers, glass short fibers having a thickness of 5 to 20 μm and a length of 7 to 50 mm are 20 to 60% by weight (preferably 30 to 60% by weight), and the balance is thermoplastic. It is recommended to use resin. If the content of short glass fibers is too low when this manufacturing method is used, the reinforcing layer 13 may have insufficient strength, and if the content of short glass fibers is too high, the bonding properties of the short glass fibers to each other may increase. May become weaker and strength may decrease. The flow of synthetic resin during pressing becomes poor. When the length of the glass short fibers is shorter than 7 mm, the reinforcing effect is weakened, and when it is longer than 50 mm, the mixing becomes difficult to be uniform.

As a sheet body that can be suitably used in such a manufacturing method, there is, for example, KP sheet (trade name) manufactured by Capela Sheet Co., Ltd., which has a PP content of 70 to 60% by weight and a short glass fiber. A sheet having a thickness of 1 to 5 mm containing 30 to 40% by weight.

FIG. 7 is an explanatory view showing an example of a method for manufacturing the laminated body 1. In this manufacturing method, a lower mold D, an upper mold U, and a peripheral mold S are used as shown in the figure, and two molds containing reinforcing fibers for forming the reinforcing layers 13, 13 are formed in these molds. The resin plates 13a, 13a are arranged to face each other with a predetermined space. When using the frame 2 (described later), the synthetic resin plates 13a, 13a are superposed on the protrusions 23a, 23a (described later) of the frame 2 and the synthetic resin plates 13a, 13a are arranged at predetermined intervals. Placed opposite to each other. Then, a stock solution of thermosetting synthetic resin such as urethane resin containing a required amount of a foaming agent is injected into the facing space between the two synthetic resin plates 13a, 13a to foam (injection foaming). By doing so, the reinforcing layers 13, 13 made of the synthetic resin plates 13a, 13a are laminated and integrated on both sides of the core layer 12 made of a thermosetting synthetic resin foam. In the case of such injection molding, an adhesive is evenly applied to the respective opposing surfaces of the synthetic resin plates 13a, 13a in advance, and the action of the adhesive causes the core material layer 12 and the reinforcing layers 13, 13 to be separated from each other. It is desirable to improve the bondability. As an adhesive that can be used for this purpose, a polyolefin resin primer having a polar group introduced therein, particularly a modified polypropylene primer having chlorine introduced therein is preferably used.

By the way, the strength of the laminated body 1, specifically, the bending strength depends on the density of the thermosetting synthetic resin foam forming the core material layer 12, and this density is different when the above-mentioned injection foaming is performed. It can be adjusted by the injection amount of the thermosetting synthetic resin stock solution. Therefore, when the laminated body 1 is manufactured by the above-mentioned injection foaming, there is an advantage that the bending strength of the laminated body 1 can be easily adjusted according to the purpose of use. Moreover, the nail holding force when the nail is driven into the laminate 1 can be adjusted by changing the injection amount of the thermosetting synthetic resin stock solution. When the building panel P using a urethane resin foam as a thermosetting synthetic resin foam is used for a concrete formwork panel, the density of the urethane resin foam is 0.25 g / cm ³ or more, preferably 0.3 g. If it is not less than / cm ³ , satisfactory bending strength can be obtained. If the filling rate is too high, not only the manufacturing cost will rise, but also the function of maintaining the heat insulation performance of the core material layer 12 will be impaired. Taking this into consideration, the density is preferably 0.5 g / cm ³ or less.

The frame 2 can be made of a synthetic resin such as polyethylene, polypropylene, vinyl chloride, polycarbonate, ABS or the like. The frame body 2 in the illustrated example is formed of four corner members 21 and four side members 25. As shown in FIG. 5, in the corner member 21, the overlapping surface 22 with the end surface of the corner portion of the laminated body 1 is formed by the curved portion 22a and the flat portions 22b, 22b on both sides thereof. Further, a perforated flange 23 is integrally provided on the overlapping surface 22, and projections 23a, 23a are integrally provided on both upper and lower sides of the perforated flange 23 at regular intervals. 24 is a hole. The side member 25 is straight, and a perforated flange 27 is integrally projectingly provided on the overlapping surface 26 with the end face of the laminated body 1, and the perforated flange 27 is fixed on both upper and lower sides. The protrusions 27a and 27a are integrally provided at intervals. 28 is a hole.

The frame body 2 is fixed to the laminated body 1 so as to surround the outer peripheral edge portion of the laminated body 1 as shown in FIG. Further, as described with reference to FIG. 7, it is desirable that the frame body 2 be assembled in the mold together with the synthetic resin plates 13a and 13a when the foaming of the core material layer is performed. As shown in FIG. 3, the thermosetting synthetic resin foam of the core material layer 12 is filled in the holes 28 of the flange 27 to enhance the bondability between the side member 22 and the core material layer 12. The same applies to the corner member 21. It is desirable that the laminated body 1 and the frame body 2 are bonded together with an adhesive.

In this way, the building panel P in which the outer peripheral edge portion of the laminated body 1 is surrounded by the frame body 2 made of a synthetic resin body is subjected to an impact applied to the laminated body 1 when it falls from a high place, for example. Is alleviated by Particularly, as described in FIG. 5, when the corner member 21 has a curved portion 22a on the overlapping surface 22 and the curved portion 22a overlaps the end surface of the corner portion of the laminate 1, the impact applied to the corner member 21 is increased. Since the curved portions 22a of the overlapping surface 22 are dispersed in a wide range of the corner portion of the laminated body 1, local stress is less likely to be applied to the laminated body 1, which is It helps prevent defects and cracks. Further, since the corner member 21 is also an integral body, it is less likely to crack. Further, since the frame body 2 surrounds the laminated body 1, the bending strength and the bending elastic modulus as a building panel are synergistically improved.

The property that the impact force is less likely to be applied to the laminate 1 by the frame body 2 as described above is a property useful as a panel for concrete formwork that is often handled roughly in high places. The panel P is also suitable for use as a concrete formwork panel from the viewpoint of impact resistance. The corner member 21 may be a right-angled triangle in a plan view as shown in FIG. 6, which also exerts an impact dispersion action. Moreover, since the property of the frame body 2 to improve the bending strength and the bending elastic modulus contributes to the improvement of the basic strength of the concrete formwork panel, it should be a panel with no problem in practical use. Come on.

When the thickness of the building panel P is set to about 12 mm, it becomes equal to the thickness of the plywood as the concrete formwork panel described at the beginning. In that case, if the thickness of the core material layer 12 is about 10 mm and the thickness of each of the reinforcing layers 13, 13 is about 1 mm, the bending strength of the building panel P can be made comparable to the plywood. In addition, the bending elastic modulus can be made to have no problem in practical use, and this building panel P can be replaced with plywood as a panel for concrete formwork. Further, cutting and nailing can be performed in the same manner as plywood, and the panel members can be easily bonded to each other, and a seamless large panel can be manufactured. In addition, what is used as a concrete formwork panel will be about the same size as the conventional plywood when the length and width dimensions are set to about 1800 × (600 to 900) mm.

The building panel P according to the embodiment shown in FIG. 4 is one in which an outer skin layer 14 is formed on both surfaces of the above-mentioned laminated body 1, that is, on the surfaces of the reinforcing layers 13, 13. Other points are the same as those described with reference to FIGS. 1 to 3 and 5 to 7.

The outer skin layer 14 is formed of a synthetic resin layer or a coating layer containing no reinforcing fiber. The synthetic resin layer and the coating layer here include not only synthetic resin but also wax such as ester of high saturated fatty acid or high unsaturated fatty acid and alcohol and hydrocarbon, resin, lactone, steroid, etc.・ Vegetable wax, paraffin and ground wax are also included.

When the synthetic resin used to form the outer skin layer 14 is a thermoplastic resin such as polypropylene, polyethylene, or polyvinyl chloride, a sheet made of these resins is prepared in advance, and the resin sheet is formed. It is possible to integrate it with a thermosetting synthetic resin foam after it has been laminated and integrated on a synthetic resin plate by laminating or hot pressing. When the synthetic resin is a thermosetting resin such as urethane or epoxy, a commercially available normal temperature or thermosetting urethane paint or epoxy paint is directly applied to the surface of the reinforcing layer 13 or via a primer. Apply and cure at room temperature or in a heating oven. With respect to the synthetic resin outer skin layer 14 thus formed, the synthetic resin of the outer skin layer 14 is entangled with the reinforcing fibers contained in the reinforcing layer 13 and further adhered by a primer, so that the outer skin layer 14 and the reinforcing layer 13 are And are firmly joined, and the situation in which the outer skin layer 14 is easily peeled off is extremely unlikely to occur. This property is useful as a panel for concrete formwork.

When the outer skin layer 14 is made of wax, the wax is applied by pressing a wax mass softened by heating against the surface of the reinforcing layer 13 of the laminate 1 and smoothing it with a roll. It is possible to adopt a method of finishing. In addition, a method in which heat-melted wax (molten wax) is dropped in a thin layer state from the wax supply box and applied on the surface of the moving laminate 1, and the applied surface is pressed by a roll or the like to finish the surface, After uniformly dispersing wax powder on the surface of the reinforcing layer 13 of the laminate 1 and heating or softening or melting the same, the coated surface is pressed with a roll or the like to finish the surface smoothly, or the wax is subjected to the fluid immersion method or It is also possible to adopt a method in which it is attached to the surface of the reinforcing layer 13 by a powder coating method and then melted in a heating furnace. In addition to that, a method such as brush painting may be used.

The outer skin layer 14 formed in this manner is also entangled with the reinforcing fibers contained in the reinforcing layer 13, so that the outer skin layer 14 and the reinforcing layer 13 are firmly bonded, and the outer skin layer 14 is formed. It is extremely unlikely that it will come off easily.

When the outer skin layer 14 containing no reinforcing fibers is formed on the surface of the reinforcing layer 13 as described above, the reinforcing fibers exposed on the surface of the reinforcing layer 13 are completely covered by the outer skin layer 14. Therefore, the reinforcing fibers do not come into contact with the skin when the panel P is handled. Also, when used as a concrete formwork panel, the reinforcing fiber is not anchored to the concrete that has been placed. Further, the surface of the panel P is provided with good slipperiness, and due to the slipperiness, concrete flows well during concrete pouring, and it is easy to obtain a concrete layer having a uniform density. Even if it is rubbed, it has an advantage that the friction is almost eliminated due to the above-mentioned good slidability. Further, when the panel is removed after the casting, the concrete layer and the panel P are easily separated without adhering, and the surface condition of the concrete layer is smooth and the finish is excellent. The wear resistance of the outer skin layer 14 is further improved by using the wax in which the polyolefin resin is mixed, and the wear resistance and elasticity of the outer skin layer 14 are formed by using the wax in which the polyolefin resin and rubber are mixed. And improve.

As described above, when the outer skin layer 14 of the panel P is formed of wax or thermoplastic resin, when the outer skin layer 14 is scraped by concrete, the skin skin layer 14 is scraped before the next use. By filling the part with wax or thermoplastic resin and applying pressure with a member with a smooth surface while heating with hot air, etc., it becomes easy to integrate with the original outer skin layer 14 and it is possible to easily carry out restoration treatment. By doing so, the number of times of repeated use increases. The same repairing process can be applied to the case where the nail driving mark left on the panel P is closed to prepare for the next use.

Next, a test piece (horizontal width × vertical width × thickness = 30 mm × 300 mm × 12 mm) including a core material layer, a reinforcing layer, and an outer skin layer was prepared, and a urethane resin foam forming the core material layer was filled. Table 1 shows measured values of the filling rate and the bending properties. The measured values of bending strength, bending elasticity, etc. are values measured based on JIS K 7203 at a fulcrum distance of 200 mm and a bending speed of 5 mm / min. In addition, the table also shows measured values of bending properties of plywood as a panel for concrete formwork. The core material layer had a thickness of 9.6 mm, the reinforcing layer had a thickness of 1.0 mm, and the outer skin layer had a thickness of 0.2 mm.

[0036]

[Table 1]

According to Table 1, in the building panel, when the urethane filling rate becomes higher, the bending strength and bending elasticity also increase accordingly. When the urethane filling rate is 0.3 or more, the bending strength is comparable to that of plywood. It has no size. Also, the bending elastic modulus is about half that of plywood, but it has been confirmed that there is no problem in actual use. Furthermore, in terms of delamination strength, this building panel is remarkably excellent, and the shore surface hardness is 10% stronger, and it is less likely to be damaged by stones. Furthermore, the weight of the concrete formwork panel is slightly more than 20% lighter, which shows that it is excellent in handling and workability. In Table 1, the delamination strength for building panels is the strength to withstand delamination between the core layer and the reinforcing layer, or between the reinforcing layer and the skin layer, and the delamination strength for plywood is laminated. The strength between the plates is such that they can withstand peeling.

[0038]

[Effect of device]

 The construction panel according to the invention of claim 1 is lightweight and easy to handle, and even if it is about the same thickness as the plywood as the concrete formwork panel described at the beginning, it is about the same as the plywood. Bending strength can be provided. Therefore, the building panel of the present invention can be used as a concrete formwork panel as a substitute for plywood. Further, the building panel of the present invention adjusts the bending strength and the bending elastic modulus by changing the foaming degree of the thermosetting synthetic resin foam such as the urethane resin foam forming the core material layer. Therefore, there is an advantage that not only the concrete formwork panel but also the bending strength required for each of various building materials can be provided.

Although the building panel of the invention of claim 2 uses the fiber-reinforced synthetic resin as the reinforcing layer, the reinforcing fiber in the reinforcing layer is prevented from coming into contact with the skin. Handleability is improved. In addition, when this building panel is used as a concrete formwork panel, the action of the outer skin layer not only makes it extremely easy to remove (remove) from the placed concrete layer, but also to make concrete. The skin surface of the layer can be finished well, the number of times that it can be used repeatedly increases dramatically, and it is in line with the recent trend of resource conservation.

According to the construction panel of the invention of claim 3, the impact applied to the laminate forming the main body when dropped from a high place is mitigated by the frame made of synthetic resin. At such times, it becomes difficult for the laminate to crack or chip. Therefore, this building panel is suitable for use as a concrete formwork panel that is often handled roughly.

[Brief description of drawings]

1 is a schematic perspective view of a building panel P according to an embodiment of the invention of claims 1 and 3;

FIG. 2 is an explanatory view showing a section of the panel with a part thereof omitted.

FIG. 3 is an explanatory diagram in which a part of FIG. 2 is enlarged.

FIG. 4 is a schematic perspective view of a building panel P according to an embodiment of the invention of claims 2 and 3.

FIG. 5 is an exploded perspective view showing a corner member and a side member of the frame body.

FIG. 6 is a perspective view showing a modified example of the corner member.

FIG. 7 is an explanatory view showing an example of a method for manufacturing a laminated body.

[Explanation of symbols]

 P Building panel 1 Laminated body 2 Frame body 12 Core material layer 13 Reinforcement layer 14 Skin layer

Claims (3)

[Scope of utility model registration request] 1. A laminate in which a reinforcing layer made of a synthetic resin containing a reinforcing fiber such as glass fiber is laminated on both surfaces of a core layer made of a thermosetting synthetic resin foam such as a urethane resin foam. A building panel characterized by consisting of a body. 2. The outer layer formed of a synthetic resin layer containing no reinforcing fibers or a coating layer is formed on the surface of the reinforcing layer.
The described building panel. 3. The building panel according to claim 1 or 2, wherein the laminated body is surrounded by a frame body arranged at an outer peripheral edge portion of the laminated body.