JP7485342B2 - Manufacturing method of building material panels - Google Patents

Description

The present invention relates to a method for manufacturing building material panels (wall materials) used for the interior and exterior of buildings, and more specifically, to a method for manufacturing building material panels that form the walls, ceilings, etc. of buildings and have a mortar layer formed on one side that has a surface appearance similar to that of exposed concrete.

From the perspective of interior design, the interior walls of buildings are typically left exposed concrete, but constructing exposed concrete walls inside an existing building requires detailed load and structural calculations, and involves extensive interior construction work involving pouring concrete inside the building, which is time-consuming, laborious, and costly.
As a means for solving such problems, Patent Document 1 proposes a building material panel (wall material) having a mortar layer with a concrete-like exposed surface on one side that constitutes an interior wall surface. This building material panel has a cement material layer (mortar layer) formed on the upper surface of a base plate, and the surface of this cement material layer is formed into a rough concrete surface. Simply by attaching this building material panel to a wall surface in an existing building with screws or the like, a concrete-like exposed surface can be created.

Patent Document 1 shows that a building panel is manufactured as follows. In this manufacturing method (the manufacturing method described in Figures 5 and 6 of the document), a base plate x constituting a building panel and a pressure plate y facing the base plate x are used as a formwork. The base plate x is arranged vertically, and the pressure plate y is arranged facing the base plate x in a low-front, high-rear shape, that is, inclined so that the lower side is close to the base plate x and the upper side is away from the base plate x. Then, mortar is poured between the base plate x and the pressure plate y, and the pressure plate y is rotated toward the base plate x side with the lower side as a fulcrum. The document states that by arranging the pressure plate y in this way at an angle and rotating the pressure plate y toward the base plate x side with the lower side as a fulcrum after pouring the mortar, the air between the base plate x and the pressure plate y is expelled upward, which has the effect of preventing the inclusion of air bubbles and the like in the mortar and producing a high-quality product. The mortar poured between the base plate x and the pressure plate y is then cured, and after the mortar has hardened, the pressure plate y is removed, resulting in a building panel with a surface that looks like exposed concrete.

Japanese Patent Application Laid-Open No. 63-255445

However, the method for producing the building material panel described in the cited document 1 has the following problems.
Since mortar is a high-density material, in order to hold the mortar poured between the base plate x and the pressure plate y in an upright state, it is necessary to firmly connect the base plate x and the pressure plate y with bolts to maintain a specified distance, but in order to do so, it is necessary to drill holes for the bolts in the base plate x and the pressure plate y, which is a complicated and time-consuming process and also deteriorates the appearance of the product. In addition, in order to pour mortar between the base plate x and the pressure plate y, it is necessary to seal the gaps at least on both ends, which is a complicated and time-consuming process.

In addition, since the building material panel is attached and fixed to an existing wall or ceiling, it is required to be lightweight. Therefore, it is desirable to make the overall thickness including the mortar layer thin (preferably 10 mm or less), and for this purpose, it is necessary to form the mortar layer thin and uniform in thickness on the base plate (base board). In addition, in order to form a mortar layer with a surface appearance like exposed concrete, it is necessary that the unevenness (such as the grain of the board) on the surface of the formwork ("pressing plate y" in the manufacturing method of Patent Document 1) is properly transferred to the surface of the mortar layer. According to the knowledge of the inventor, in order to satisfy these, it is necessary to apply a load to the base plate (base board) to press the mortar onto the base plate and to press the mortar onto the formwork surface, and it is not possible to form a thin and uniform mortar layer pressed onto the base plate by simply pouring mortar between the base plate x and the pressing plate y as in the manufacturing method of Patent Document 1, and the unevenness of the formwork surface is not properly transferred to the surface of the mortar layer. Therefore, the manufacturing method of Patent Document 1 cannot produce a building material panel that is thin and lightweight and has an excellent surface appearance that resembles exposed concrete.

The object of the present invention is therefore to solve the problems of the prior art as described above, and to provide a manufacturing method for building material panels that form the walls, ceilings, etc. of buildings, on one side of which a mortar layer with a surface appearance similar to that of exposed concrete is formed, and which can efficiently manufacture building material panels that are thin and lightweight and have an excellent surface appearance similar to that of exposed concrete with high productivity.

The manufacturing method of the present invention solves the above problems by spreading mortar inside a flat formwork, fitting a base board into the formwork so that it adheres closely to the mortar, and then curing the mortar while applying a load to the base board. The gist of the method is as follows.

[1] A method for manufacturing a building material panel in which a mortar layer (b) having a surface appearance like exposed concrete is formed on one side ( _a0 ) of a base board (a) using a formwork (1) having a bottom plate portion (2) on which mortar is spread and a side wall portion (3) erected around the bottom plate portion (2),
A step ( _A ) of applying a mortar bonding adhesive (d) to one side ( _a0 ) of a base board (a) having an anchor member (c) for strengthening mortar bonding fixed thereto;
A process (B) of pouring mortar (e) into the formwork (1) placed with the bottom plate portion (2) facing upward, and spreading the mortar (e) in layers on the bottom plate portion (2);
a step (C) of fitting the base board (a) subjected to the step (A) into the formwork (1) in which the mortar (e) has been spread in a layer on the bottom plate portion (2) in the step (B) and adhering one side (a ₀ ) of the base board (a) to the upper surface of the mortar (e);
a step (D) of placing a pressure plate (4) on the base board (a) fitted into the formwork (1) in the step (C) and applying a load to the pressure plate (4) by a load applying means (5) to press the base board (a) against the mortar (e) while curing the mortar (e);
The method for manufacturing a building material panel is characterized by having a step (E) of removing the building material panel having a concrete-like mortar layer (b) formed on one side ( _a0 ) of the base board (a) from the formwork (1) after the curing in the step (D) is completed.

[2] A method for producing a building material panel, characterized in that in the above-mentioned manufacturing method [1], before pouring the mortar (e) into the formwork (1) in step (B), a release agent (f) for facilitating release of the solidified mortar layer (b) is applied to at least an upper surface of the bottom plate portion (2) in the formwork (1).
[3] A method for manufacturing a building material panel according to the above-mentioned [1] or [2], characterized in that in the step (D), a load is applied to the pressure plate (4) by a load-applying means (5) equipped with a restraining member (6) that restrains the pressure plate (4) in the formwork thickness direction and presses it against the base board (a), and a holding means (7) that holds the restraining member (6) in that state.
[4] In the manufacturing method of the above [3], the restraining member (6) is composed of restraining members (6a) and (6b) that sandwich the formwork (1) together with the pressing plate (4) from above and below to restrain it,
A method for manufacturing a building material panel, wherein the holding means (7) is composed of fastening bolts and nuts (7x) that fasten and tighten the upper and lower restraining members (6a), (6b).

[5] In the manufacturing method of the above [4], bolt insertion holes (10) are formed at both longitudinal ends of the formwork (1), and bolt insertion holes (60a), (60b) are formed at both longitudinal ends of the restraining members (6a), (6b),
In step (D), with the formwork (1) and the pressure plate (4) sandwiched between the restraining members (6a), (6b), the bolts of the fastening bolts and nuts (7x) are inserted into the bolt insertion holes (10) and the bolt insertion holes (60a), (60b), and the fastening bolts and nuts (7x) are fastened and tightened to apply a load to the pressure plate (4) in the thickness direction of the formwork. This is a method for manufacturing a building material panel.
[6] The manufacturing method for a building material panel according to the above [4] or [5], wherein the restraining members (6a), (6b) each consist of a plurality of steel members.

[7] The method for producing a building material panel according to any one of the above-mentioned [1] to [6], wherein in the step (D), the mortar (e) is cured in an atmosphere at 50 to 100°C.
[8] A method for manufacturing a building material panel, in any one of the manufacturing methods [1] to [7] above, characterized in that an anchor member (c) for strengthening mortar adhesion is fixed to one side ( _a0 ) of the base board (a) before the adhesive (d) is applied in the step (A).
[9] The manufacturing method for a building material panel according to any one of the manufacturing methods [1] to [8] above, wherein the shape of the upper surface of the bottom plate portion (2) of the formwork (1) and the shape of the base board (a) are non-planar.
[10] The method for producing a building material panel according to any one of the above [1] to [9], wherein the mortar (e) contains a granular material having a lower specific gravity than the mortar.

The manufacturing method of the present invention allows efficient production of thin, lightweight building material panels with an excellent surface appearance that resembles exposed concrete, with high productivity. The present invention allows the building material panels to be made thin and lightweight, so they can be handled in the same way as commercially available building material boards (e.g., calcium silicate board, plasterboard, etc.) and can be easily attached and installed in various locations such as walls and ceilings.

FIG. 1 is a partially cutaway perspective view showing an example of a building material panel produced by the method of the present invention. Cross-sectional view of the building material panel in FIG. 1 in the thickness direction. FIG. 1 is a perspective view showing an example of a formwork used in manufacturing a building material panel in the method of the present invention. An explanatory diagram showing step (A) in one embodiment of the method of the present invention. FIG. 1 is an explanatory diagram showing step (B) in one embodiment of the method of the present invention. An explanatory diagram showing step (C) in one embodiment of the method of the present invention. An explanatory diagram showing step (D) in one embodiment of the method of the present invention. FIG. 8 is a plan view partially showing a state in which a load is applied to the pressing plate by the load applying means in step (D) of FIG. 7 . 8 is a cross-sectional view taken along the line D-D of FIG. An explanatory diagram showing step (E) in one embodiment of the method of the present invention. In one embodiment of the present invention, when a building material panel having a circular cross section is manufactured, a longitudinal sectional view of a formwork in step (D) is shown.

1 and 2 are schematic diagrams showing an example of a building panel manufactured by the method of the present invention, where FIG. 1 is a partially cutaway perspective view and FIG. 2 is a cross-sectional view in the thickness direction.
This building material panel has a mortar layer b having a surface appearance like exposed concrete formed on one side _a0 of a base board a, and an anchor material c for strengthening the adhesion of the mortar is fixed to one side _a0 of the base board a, and the mortar layer b is formed through this anchor material c. The building material panel in Fig. 1 has a flat rectangular shape, but is not limited to this and may have any shape. There is no particular limit to the thickness of the building material panel, but it is preferable that it is 10 mm or less from the viewpoint of weight reduction as described later.
3 shows an example of a form used in manufacturing a building panel in the method of the present invention, and this form 1 is rectangular in plan view and includes a bottom plate 2 on which poured mortar e is spread, and a side wall 3 erected around (the outer peripheral edge portion) this bottom plate 2. Since a base board a is fitted into this form 1, the bottom plate 2 has approximately the same shape and size as the base board a. The form 1 (bottom plate 2) may have any planar shape depending on the planar shape of the building panel to be manufactured.

At least the surface portion of the bottom plate 2 of the formwork 1 that comes into contact with the mortar e is made of a natural plate material, and the unevenness (wood grain, etc.) of the surface of the natural plate material is transferred to the surface of the mortar layer b, giving the surface appearance of the mortar layer b an exposed concrete look. Therefore, the entire bottom plate 2 may be made of a natural plate material. In addition, it is preferable to paint the surface of the natural plate material in order to make the surface of the mortar layer b smooth.
In this embodiment, as described below, mortar e is poured into the formwork 1 and spread out, a base board a is set on top of it, and a pressure plate 4 is set on top of that, and in this state, a load is applied from above to the pressure plate 4 by the load application means 5 to cure the mortar e, so that the upper surface of the pressure plate 4 set on the base board a needs to be positioned higher than the upper end of the side wall 3. For this reason, it is preferable that [height h of the side wall 3 inside the formwork] - [thickness of the interior panel to be manufactured (thickness of mortar e + thickness of base board a)] < [thickness of the pressure plate 4].

An embodiment of the manufacturing method of the present invention using the mold 1 shown in FIG. 3 will be described below.
4 to 10 show an embodiment of a manufacturing method of the present invention in the order of steps.
First, as shown in FIG. 4, a base board a having an anchor member c for strengthening mortar adhesion fixed to one side _a0 is prepared, and an adhesive d for mortar adhesion is applied to one side _a0 of this base board a (step (A)).
The type of base board a to be used is not particularly limited as long as it is a non-combustible board that can be adhered to mortar and fixed to a wall, etc., and examples of such boards include calcium silicate board, plaster board, MDF board (board made from cardboard), etc. The thickness of the base board a is usually about 5 to 10 mm, and from the viewpoint of making the thickness of the entire panel thin (for example, to a thickness of 10 mm or less) in order to reduce weight, a thickness of about 3 to 6 mm is preferable.
The building material panel of the present invention can be used not only for the interior of a building, but also for the exterior of a building, for example by attaching and fixing it to the exterior wall surface. In this case, it is preferable to use, as the base board a, for example, one of the various boards mentioned above that has been coated with or impregnated with a primer or the like to improve water resistance and weather resistance.

The type of anchor member c is not particularly limited as long as it can exert a physical anchor function to bond and hold mortar e to the base board a, and for example, one or more mesh-like metal members such as metal lath, wire mesh, expanded metal, wire lath, etc. can be used. This anchor member c is attached and fixed to the entire surface of one side _a0 of the base board a using a tacker or the like. Then, an adhesive d (primer) for mortar adhesion is applied to the entire surface of one side _a0 of the base board a to which this anchor member c is attached and fixed. The adhesive d can be applied by any method, such as application with an application roller or spraying. As the adhesive d, a commercially available adhesive for mortar can be used.

Before or after the above step (A), as shown in FIG. 5, mortar e is poured into the formwork 1 placed flat with the bottom plate portion 2 facing upward, and the mortar e is spread in layers on the bottom plate portion 2 (step (B)).
The thickness of the mortar e is not particularly limited, but is usually about 3 to 10 mm, and is preferably about 3 to 6 mm, particularly from the viewpoint of making the overall panel thickness thin (for example, 10 mm or less) for weight reduction. The method of spreading the mortar e in layers is not particularly limited, but a mortar trowel or the like is usually used. It is preferable to spread the mortar e in a layer that is as uniform and smooth as possible.

There is no particular restriction on the type of cement used in the mortar e, but polymer cement is particularly preferred. For example, a mortar in which polymer cement and fine aggregate (such as sand) are mixed with an admixture (such as a mortar adhesion enhancer) as necessary can be used. It is also preferable to add a hardening accelerator to the mortar e. Furthermore, in order to reduce the weight of the building material panel, an appropriate amount of low-density granular material (granular material with a lower specific gravity than the original mortar) may be added to the mortar e. There is no particular restriction on the type of granular material to be added, but examples include perlite with a particle size of 5 mm or less (preferably about 3 to 5 mm). The content (addition amount) of the granular material may be at a level that does not cause problems in the properties and strength of the mortar layer b.
In step (B), before pouring the mortar e into the formwork 1, it is preferable to apply a release agent f to at least the bottom plate portion 2 in the formwork 1 in order to assist in the release of the solidified mortar layer b. As the release agent f, release oil or the like can be used.

Next, as shown in FIG. 6, the base board a subjected to the above step (A) is fitted into the formwork 1 in which the mortar e has been spread in a layer on the bottom plate portion 2 in the above step (B), and one surface _a0 of the board (the surface to which the anchor member c is fixed) is brought into close contact with the upper surface of the mortar e (step (C)).
Next, as shown in FIG. 7, a pressure plate 4 is placed on the base board a fitted into the formwork 1 in the above step (C), and a load is applied to the pressure plate 4 by a load application means 5 to press the mortar e and the base board a together while curing the mortar e (step (D)).
The pressure plate 4 is used to apply a load evenly to the base board a, and is made of a plate material such as plywood or building material board. The pressure plate 4 in this embodiment is approximately the same size as the base board a, and is fitted into the formwork 1 from above the base board a. As described above, in this state, the upper surface level of the pressure plate 4 is located above the upper end of the side wall portion 3 of the formwork 1.

The load applying means 5 can be of any type or structure as long as it can apply a load to the pressure plate 4 as uniformly as possible, but a simple load applying means 5 can be one that includes, for example, a restraining member 6 that restrains the pressure plate 4 in the form thickness direction and presses it against the base board a, and a holding means 7 that holds the restraining member 6 in that state. An example of such a load applying means 5 is one in which the restraining member 6 is composed of restraining members 6a, 6b that sandwich and restrain the formwork 1 together with the pressure plate 4 from above and below, and the holding means 7 is composed of fastening bolts and nuts 7x that fasten and tighten the upper and lower restraining members 6a, 6b.

This embodiment also uses such a load applying means 5, and the restraining members 6a, 6b are each composed of a plurality of steel members. Figure 8 is a plan view partially showing the state in this embodiment in which a load is applied to the pressure plate 4 by such a load applying means 5, and Figure 9 is a cross-sectional view taken along the line D-D of Figure 8.
A plurality of bolt insertion holes 10 are formed at both longitudinal ends of the formwork 1 at a predetermined interval in the width direction of the formwork, and bolt insertion holes 60a, 60b are also formed at both longitudinal ends of each of the steel frames which are the restraining members 6a, 6b.
In this load applying means 5, a plurality of steel members, which are the restraining members 6a, 6b, are placed on the presser plate 4 and below the formwork 1, respectively, so that the restraining members 6a, 6b sandwich the formwork 1 together with the presser plate 4 from above and below. In this state, the bolts of the fastening bolts and nuts 7x are inserted into the bolt insertion holes 10 and the bolt insertion holes 60a, 60b, and the fastening bolts and nuts 7x fasten and tighten the restraining members 6a, 6b. In other words, by sandwiching and tightening the formwork 1 together with the presser plate 4 from above and below with the restraining members 6a, 6b, a load is applied to the presser plate 4 in the formwork thickness direction.

There is no particular limit to the number of steel members constituting the restraining members 6a, 6b, as long as they are able to apply a uniform load to the pressure plate 4 in the width direction; however, when manufacturing panels of general size, it is preferable to have three or more of each.
The mortar e may be cured at room temperature, but since the mortar e is sealed in the formwork 1, it is difficult to solidify, and it takes time to solidify at room temperature. For this reason, in order to promote the solidification of the mortar e and its adhesion to the base board a from the viewpoint of productivity, it is preferable to cure the mortar e for a predetermined period of time, preferably 6 hours or more, in an atmosphere of about 50°C to 100°C, preferably about 70°C to 90°C. For example, the formwork is placed in a drying chamber, and hot air of about 70°C to 90°C is introduced into the chamber to cure the mortar e for about 8 to 15 hours.
After the curing process in step (D) is completed, the building material panel having the mortar layer b having a surface appearance like exposed concrete formed on one side _a0 of the base board a is removed from the formwork 1 as shown in FIG. 10 (step (E)).

The manufacturing method of the present invention is also capable of producing building material panels having a non-planar shape. In this case, a formwork 1 having a non-planar upper surface of the bottom plate portion 2 and a non-planar base board a (and further a pressure plate 4) are used.
Fig. 11 shows an embodiment for manufacturing a building material panel having an arc-shaped cross section, and shows the vertical cross sections of the formwork 1, mortar e, base board a, etc. in step (D). In this embodiment, the bottom plate portion 2 of the formwork 1, the base board a, and the pressure plate 4 all have an arc-shaped cross section, the mortar e is spread along the arc-shaped upper surface of the bottom plate portion 2, the base board a and the pressure plate 4 are placed on top of it in that order, and a load is applied by the load application means 5 as shown in Figs. 8 and 9. The other configurations are the same as those of the embodiments shown in Figs. 4 to 10.
To produce a base board a with an arc-shaped cross section, for example, a material that deforms when wetted with water (e.g., an MDF board) is used as the base board a, and the water-soaked base board a is pressed against the upper surface (arc surface) of the bottom plate portion 2 of the formwork 1 in advance to deform it, and then dried in this deformed state.

In the manufacturing method of the building material panel of the present invention described above, mortar e is poured into the formwork 1 laid flat and spread in layers, and then the base board a with the anchor member c fixed to one side _a0 and the adhesive d applied thereto is fitted into the formwork 1 to be in close contact with the mortar e, and then the mortar is cured while applying a load to the base board a with the pressing plate 4 and the load applying means 5, so that a thin and uniform thickness mortar layer b pressed against the base board a can be formed, and thus a thin and lightweight building material panel can be manufactured, for example, a building material panel with a thickness of 10 mm or less can be manufactured. In addition, since the mortar e is cured while applying a load to the base board a, the unevenness (such as the grain of the board) of the bottom plate portion 2 of the formwork 1 is appropriately transferred to the surface of the mortar layer b, and a building material panel with an excellent surface appearance like exposed concrete can be manufactured. Therefore, a building material panel that is thinner, lighter, and has an excellent appearance like exposed concrete can be manufactured than the building material panel manufactured by the manufacturing method of Patent Document 1.

Furthermore, the manufacturing method of the present invention can be carried out using simple equipment consisting of a flat-laying formwork 1, a pressure plate 4, and a load-applying means 5, and since the work efficiency is significantly higher than that of the manufacturing method of Patent Document 1, etc., the building material panels can be manufactured efficiently with high productivity, and therefore manufacturing costs can be kept low.
The building material panel manufactured by the manufacturing method of the present invention is used as a panel to be attached and fixed to, for example, walls, ceilings, pillars, beams, etc. inside and outside a building. The building material panel is attached and fixed, for example, by an adhesive and nails or screws.
The size of one building material panel is arbitrary, but may be, for example, about 600 to 630 mm×1500 mm. This building material panel can be easily cut with a circular saw or the like.
Since the building material panel produced by the method of the present invention is thin and lightweight as described above, it can be handled in the same way as commercially available building material boards (e.g., calcium silicate board, plaster board, etc.), and is easy to handle and has excellent workability.

REFERENCE SIGNS LIST 1 Formwork 2 Bottom plate 3 Side wall 4 Pressing plate 5 Load applying means 6, 6a, 6b Restraining member 7 Holding means 7x Fastening bolt/nut 10 Bolt insertion hole 60a, 60b Bolt insertion hole a Base board a ₀ One side b Mortar layer c Anchor member d Adhesive e Mortar f Release agent

Claims (10)

A method for manufacturing a building material panel having a mortar layer (b) having a surface appearance like exposed concrete formed on one side ( _a0 ) of a base board (a) using a formwork (1) having a bottom plate portion (2) on which mortar is spread and a side wall portion (3) erected around the bottom plate portion (2), comprising:
A step ( _A ) of applying a mortar bonding adhesive (d) to one side ( _a0 ) of a base board (a) having an anchor member (c) for strengthening mortar bonding fixed thereto;
A process (B) of pouring mortar (e) into the formwork (1) placed with the bottom plate portion (2) facing upward, and spreading the mortar (e) in layers on the bottom plate portion (2);
a step (C) of fitting the base board (a) subjected to the step (A) into the formwork (1) in which the mortar (e) has been spread in a layer on the bottom plate portion (2) in the step (B) and adhering one side (a ₀ ) of the base board (a) to the upper surface of the mortar (e);
a step (D) of placing a pressure plate (4) on the base board (a) fitted into the formwork (1) in the step (C) and applying a load to the pressure plate (4) by a load applying means (5) to press the base board (a) against the mortar (e) while curing the mortar (e);
The method for manufacturing a building material panel is characterized by having a step (E) of removing the building material panel having a concrete-like mortar layer (b) formed on one side ( _a0 ) of the base board (a) from the formwork (1) after the curing in the step (D) is completed. The method for manufacturing a building material panel according to claim 1, characterized in that, before pouring the mortar (e) into the formwork (1) in step (B), a release agent (f) is applied to at least the upper surface of the bottom plate portion (2) in the formwork (1) to aid in the release of the solidified mortar layer (b). The method for manufacturing a building panel according to claim 1 or 2, characterized in that in step (D), a load is applied to the pressure plate (4) by a load applying means (5) equipped with a restraining member (6) that restrains the pressure plate (4) in the formwork thickness direction and presses it against the base board (a), and a holding means (7) that holds the restraining member (6) in that state. The restraining member (6) is composed of restraining members (6a) and (6b) which sandwich and restrain the formwork (1) together with the pressing plate (4) from above and below,
4. The method for manufacturing a building panel according to claim 3, wherein the holding means (7) is composed of fastening bolts and nuts (7x) for fastening and tightening the upper and lower restraining members (6a), (6b). Bolt insertion holes (10) are formed at both longitudinal ends of the formwork (1), and bolt insertion holes (60a), (60b) are formed at both longitudinal ends of the restraining members (6a), (6b),
The manufacturing method of a building material panel according to claim 4, characterized in that in the step (D), while the restraining members (6a), (6b) sandwich the formwork (1) together with the pressing plate (4) from above and below, the bolts of the fastening bolts and nuts (7x) are inserted into the bolt insertion holes (10) and the bolt insertion holes (60a), (60b), and the restraining members (6a), (6b) are fastened and tightened with the fastening bolts and nuts (7x), thereby applying a load to the pressing plate (4) in the formwork thickness direction. The method for manufacturing a building panel according to claim 4 or 5, characterized in that the restraining members (6a) and (6b) are each made of multiple steel members. The method for manufacturing a building panel according to any one of claims 1 to 6, characterized in that in step (D), the mortar (e) is cured in an atmosphere of 50 to 100°C. The method for manufacturing a building material panel according to any one of claims 1 to 7, characterized in that in step (A), an anchor member (c) for strengthening mortar adhesion is fixed to one side (a ₀ ) of the base board (a) before the adhesive (d) is applied thereto. The method for manufacturing a building material panel according to any one of claims 1 to 8, characterized in that the shape of the top surface of the bottom plate portion (2) of the formwork (1) and the shape of the base board (a) are non-planar. The method for manufacturing a building material panel according to any one of claims 1 to 9, characterized in that the mortar (e) contains granular material having a lower specific gravity than the mortar.

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