Joint structure of building material panel

Abstract

To provide a joint structure of building material panels that can provide effective fire protection for joint portions of building material panels.SOLUTION: A joint structure of building material panels having a sandwich structure in which a core material 13 is sandwiched between two face materials 11, 12 and in which joint ends 30, 40 are joined to each other by a concave-convex fit. A first fire-resistant member 71 is arranged at one surface side of a panel 1 and a second fire-resistant member 72 is arranged at the other surface side of the panel 1 at a joint portion 20 where the joint ends 30, 40 face each other. The first fire-resistant member 71 and the second fire-resistant member 72 are spaced apart in a thickness direction of the panel 1.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a joining structure of building material panels that constitute walls, roofs, etc. of a building.

Background Art

[0002] In some cases, the outer walls, partition walls, roofs, etc. of factories, warehouses, etc. are easily constructed by joining a plurality of panels. For example, a metal sandwich panel in which a core material having fire resistance or heat insulation is sandwiched between facing materials made of two thin metal plates is excellent in airtightness, fire resistance function, or heat insulation function, and has good workability.

[0003] As a structure for joining such panels, a form in which a convex portion formed at the joining end portion on the other end side is fitted into a groove-shaped concave portion formed at the joining end portion on one end side is known (Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, walls, roofs, etc. made of this type of building material panel may be required to have a fire prevention function in the event of a fire. For example, by arranging a fire-resistant member at the joint (joint) between building material panels, measures are taken to block flames and hot air passing through the joint and suppress damage caused by fire.

[0006] An object of the present invention is to provide a joining structure of building material panels capable of realizing effective fire prevention measures for joints of building material panels.

Means for Solving the Problems

[0007] (1) The joining structure of the building material panel of the present invention has a sandwich structure in which a core material is sandwiched between two facing materials, and is a joining structure of building material panels in which joining ends joined to each other by uneven fitting are joined. On one side of the building material panel of the joining portion where the joining ends face each other, a first fireproof member for closing the joining portion is arranged, and on the other side of the building material panel, a second fireproof member for closing the joining portion is arranged, and the first fireproof member and the second fireproof member are separated from each other in the thickness direction of the building material panel.

[0008] (2) In the joining structure of the building material panel of the present invention, the first fireproof member and the second fireproof member include a form in which they are displaced in the plane direction of the building material panel.

[0009] (3) In the joining structure of the building material panel of the present invention, at least one of the first fireproof member and the second fireproof member is a seal-like member, and includes a form in which it is adhesively arranged on the building material panel.

[0010] (4) In the joining structure of the building material panel of the present invention, at least one of the first fireproof member and the second fireproof member is in a state of paint, and includes a form in which it is applied and arranged on the building material panel.

[0011] (5) In the joining structure of the building material panel of the present invention, the core material includes a form in which it is either an inorganic core material made of an inorganic material or an organic core material made of an organic material.

Effect of the Invention

[0012] According to the present invention, it is possible to provide a joining structure of a building material panel capable of realizing effective fire prevention measures for the joining portion of the building material panel.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a part of the outer wall 5 configured by joining a plurality of building material panels 1 (hereinafter, simply abbreviated as panel 1) according to the embodiment. The panel 1 has a rectangular shape. The panel 1 is incorporated in a horizontally stretched state with its longitudinal direction along the horizontal direction. FIG. 2 shows a cross section along the longitudinal direction of the panel 1 in the state of being incorporated as the outer wall 5. FIG. 3 is a longitudinal sectional view showing a state in which the upper and lower joining ends 30 and 40 of a pair of panels 1 joined in the vertical direction are joined. In FIGS. 1 to 3, the outdoor X side of the outer wall 5 and the indoor Y side of the outer wall 5 are respectively shown.

[0015] As shown in FIG. 2, the panel 1 is a metal sandwich panel in which a core material 13 having a predetermined thickness is sandwiched between a front surface material 11 and a back surface material 12 made of a thin metal plate. The front surface material 11 and the back surface material 12 are respectively adhered to both surfaces of the core material 13 by an adhesive. As the adhesive, it is selected according to the materials of the front surface material 11, the back surface material 12, and the core material 13, and for example, a resin-based adhesive such as a urethane-based adhesive or an epoxy-based adhesive is used. The panel 1 has the front surface material 11 arranged on the outdoor X side and the back surface material 12 arranged on the indoor Y side. Hereinafter, the outdoor X side may be referred to as the front surface side, and the indoor Y side may be referred to as the back surface side.

[0016] The materials of the front side material 11 and the back side material 12 are not limited. For example, various color steel plates, fluorine steel plates, PVC steel plates, galvanized steel plates (registered trademark), stainless steel plates such as SUS, etc., and thin plates having elasticity with a thickness of about 0.35 to 1.2 mm are used. The core material 13 of the embodiment is an inorganic core material made of an inorganic material, and rock wool is used. Specifically, a binder resin such as a phenolic resin is impregnated at an appropriate ratio, and for example, rock wool compressed to a high density of about 120 to 220 kg / m 3 is used. The core material 13 is pre-formed into a panel shape according to the sizes of the respective facing materials 11 and 12, and is disposed between the facing materials 11 and 12 and adhered to the inner surfaces of these facing materials 11 and 12.

[0017] The overall dimensions of the panel 1 are arbitrary and are adapted to the outer wall 5 to be constructed. For example, the dimension in the longitudinal direction (the lateral direction on the outer wall 5): about 900 to 12000 mm, the dimension in the short direction (the longitudinal direction on the outer wall 5): about 400 to 1200 mm, and the thickness: about 25 to 300 mm.

[0018] The joint ends 30 and 40 of the panel 1 are, that is, the upper first joint end 30 and the lower second joint end 40. The first joint end 30 and the second joint end 40 are joined to form a joint portion 20 where these joint ends 30 and 40 face each other. The joint portion 20 includes a joint formed between the joint ends 30 and 40.

[0019] As shown in FIGS. 2 and 3, the first joint end portion 30 has a first protrusion 31, a second protrusion 32, and a first groove portion 33 between the first protrusion 31 and the second protrusion 32. The first protrusion 31 and the second protrusion 32 are ridges extending along the longitudinal direction of the first joint end portion 30 (the front-back direction of the paper surface in FIGS. 2 and 3). The first protrusion 31 and the second protrusion 32 are arranged at intervals in the panel thickness direction (the left-right direction in FIGS. 2 and 3). The first protrusion 31 is arranged on the surface side (outdoor X side) rather than the central portion of the panel thickness, and the second protrusion 32 is arranged on the back side (indoor Y side) rather than the central portion of the panel 1 thickness. The first protrusion 31 and the second protrusion 32 both protrude upward, that is, in the joint direction which is the side of the second joint end portion 40.

[0020] On the surface side of the first joint end portion 30, a front side step portion 39 for reducing the thickness is formed. The first protrusion 31 continuous with the front side step portion 39 is formed by the front side surface material 11 extending in the joint direction and then bending inward and being folded back 180° in the direction opposite to the joint direction. Further, the front side surface material 11 extends inward from the first protrusion 31 and covers the end face of the core material 13. The first protrusion 31 is formed by the front side surface material 11 that overlaps doubly. The bottom of the first groove portion 33 is formed by the end portion of the front side surface material 11.

[0021] On the back side of the first joint end portion 30, a back side step portion 34 for reducing the thickness is formed. The back side surface of the back side step portion 34 is formed by the back side surface material 12.

[0022] The second protrusion 32 is formed by a back side surface material 12 that extends in the joint direction and then bends inward by 90°, and a core material 13 covered by the back side surface material 12. The inner surface of the core material 13 of the second protrusion 32 is exposed.

[0023] The first protrusion 31 and the second protrusion 32 are arranged offset from each other in the joint direction (the vertical direction). And the protruding length in the joint direction is longer for the second protrusion 32 than for the first protrusion 31. Further, in terms of thickness, the thickness of the second protrusion 32 is larger than the thickness of the first protrusion 31.

[0024] As shown in FIG. 3, the second joint end portion 40 has a structure that fits into the first joint end portion 30 with unevenness. That is, the second joint end portion 40 has a second groove portion 42 into which the first protrusion 31 fits, a third groove portion 43 into which the second protrusion 32 fits, and a third protrusion 44 that fits into the first groove portion 33. Further, the second joint end portion 40 has a first cover portion 45 on the front surface side and a second cover portion 46 on the back surface side. The third protrusion 44, the first cover portion 45, and the second cover portion 46 are ridges extending along the longitudinal direction of the second joint end portion 40 (the front-back direction of the paper surface in FIG. 3).

[0025] The second groove portion 42 is formed between the first cover portion 45 and the third protrusion 44. In the second joint end portion 40, the front surface material 11 extends a predetermined length in the joining direction toward the first joint end portion 30 and then bends inward, and further folds back 180° to form the first cover portion 45. The front surface material 11 forming the first cover portion 45 continuously forms the second groove portion 42 and the third protrusion 44. The bottom of the second groove portion 42 is formed by the front surface material 11. The third protrusion 44 is formed by the front surface material 11 extending in the joining direction from the bottom of the second groove portion 42 and then folding back 180°. The first cover portion 45 is continuous with the surface of the panel 1.

[0026] In the second joint end portion 40, the back surface material 12 extends a predetermined length in the joining direction and then bends inward, and further folds back 180° to form the second cover portion 46. The third groove portion 43 is disposed between the second cover portion 46 and the third protrusion 44. The third groove portion 43 is formed surrounded by the second cover portion 46 and the exposed inner surface of the core material 13, and the bottom 43a of the third groove portion 43 is mainly formed by the back surface material 12. The second cover portion 46 is continuous with the back surface of the panel 1.

[0027] The second groove portion 42 and the third groove portion 43 are displaced from each other in the joining direction (vertical direction), and the third groove portion 43 is formed so as to be located above the second groove portion 42. Similarly, the first cover portion 45 and the second cover portion 46 are displaced from each other in the joining direction, and the second cover portion 46 is formed so as to be located above the first cover. Although the first cover portion 45 and the second cover portion 46 are displaced from each other in the joining direction, a part of each, that is, the upper part of the first cover portion 45 and the lower part of the tip of the second cover portion 46 overlap each other in the panel thickness direction.

[0028] As shown in FIG. 3, the outer wall 5 shown in FIG. 1 is fixed to the horizontal body edge 55 with a screw member 50 such as a tapping screw at the upper joining end portion 30 of the panel 1 standing in a horizontally stretched posture, and then the lower second joining end portion 40 of the panel 1 to be installed on the upper side is fitted to this joining end portion 30. By repeating this construction and assembling a plurality of panels 1 upward, the outer wall 5 is constructed.

[0029] The screw member 50 penetrates the first joining end portion 30 from the front side step portion 39 to the back side and is screwed into the horizontal body edge 55 and fastened. The head portion 50a of the screw member 50 is fastened with the front side step portion 39 as a seating surface.

[0030] In a state where the first joining end portion 30 and the second joining end portion 40 are joined, the first protruding portion 31 of the first joining end portion 30 fits into the second groove portion 42 of the second joining end portion 40, and the third protruding portion 44 of the second joining end portion 40 fits into the first groove portion 33 of the first joining end portion 30. In this fitted state, the third protruding portion 44 elastically abuts against the inner surface of the first protruding portion 31. The first cover portion 45 of the second joining end portion 40 is in a state of being accommodated in the front side step portion 39 of the first joining end portion 30. This first cover portion 45 covers the first protruding portion 31 and the head portion 50a of the screw member 50. As a result, the head portion 50a of the screw member 50 is not exposed, and the appearance from the outdoor X side becomes flat.

[0031] In addition, in a state where the first joint end portion 30 and the second joint end portion 40 are joined, the second protrusion 32 of the first joint end portion 30 fits into the third groove portion 43 of the second joint end portion 40. When fitting in this way, the second cover portion 46 elastically abuts against the surface of the back stepped portion 34. As a result, the second cover portion 46 elastically abuts against the root portion of the second protrusion 32.

[0032] Here, in the present embodiment, a water stop material 61 is disposed at the bottom of the second groove portion 42 of the second joint end portion 40. A part of the water stop material 61 is compressed by the tip of the first protrusion 31 that fits into the second groove portion 42 and is deformed from its original state. The water stop material 61 fills the gap of the joint portion 20. The water stop material 61 fills the gap to ensure water tightness and air tightness. For example, a generally well-known material such as a silicon-based sealing material or butyl rubber is used. The water stop material 61 is disposed on the surface side (outdoor X side) at the joint portion 20.

[0033] In addition, in the present embodiment, a first fireproof member 71 and a second fireproof member 72 that close the joint portion 20 are disposed at the joint portion 20.

[0034] The first fireproof member 71 is disposed at the bottom of the first groove portion 33 in the first joint end portion 30. A part of the first fireproof member 71 is compressed by the third protrusion 44 of the second joint end portion 40 that fits into the first groove portion 33 and is deformed from its original state.

[0035] The second fireproof member 72 is disposed at the bottom of the third groove portion 43 in the second joint end portion 40. The tip of the second protrusion 32 of the first joint end portion 30 is in close contact with the second fireproof member 72.

[0036] The first fireproof member 71 and the second fireproof member 72 are disposed in the thickness direction of the panel 1. The first fireproof member 71 is disposed on the surface side (outdoor X side: one surface side) of the panel 1, and the second fireproof member 72 is disposed on the back surface side (indoor Y side: one surface side) of the panel 1. And the water stop material 61 is disposed on the surface side rather than the first fireproof member 71.

[0037] The first refractory member 71 and the second refractory member 72 are separate members and are spaced apart in the thickness direction of the panel 1 (the left - right direction in FIG. 3). Further, the first refractory member 71 and the second refractory member 72 are displaced in the surface direction of the panel (the up - down direction in FIG. 3). In the present embodiment, the first refractory member 71 is disposed below the second refractory member 72.

[0038] As the first refractory member 71 and the second refractory member 72, any material may be used as long as it has a function of closing the joint portion 20 during a fire to prevent flames and hot air from penetrating through the joint portion 20. For example, a resin that foams upon heating or a thermally expandable foam material containing graphite is preferably used. Examples of this type of airtight foam material include a seal - like member and a material in the form of a paint. In the case of the seal - like member, it is disposed by being adhered to the panel 1. In the case of the paint, it is disposed by being applied to the panel 1. Either one of the first refractory member 71 and the second refractory member 72 may be a seal - like member and the other may be a paint, both may be seal - like members, or both may be paints. In any case, when this type of airtight foam material is heated to a predetermined temperature during a fire and foams, even if deformation occurs at the joint portion 20, it follows the deformation to close the gap of the joint portion 20 and prevent flames and hot air from penetrating through the joint portion 20.

[0039] According to the panel joint structure of the above - described embodiment, on the front - side of the panel 1 of the joint portion 20 where the joint ends 30 and 40 face each other, the first refractory member 71 that closes the joint portion 20 is disposed, and on the back - side of the panel 1, the second refractory member 72 that closes the joint portion 20 is disposed, and the first refractory member 71 and the second refractory member 72 are spaced apart in the thickness direction of the panel 1.

[0040] As a result, each of the fire-resistant members 71 and 72 is close to the front surface side or the back surface side of the panel 1. Therefore, during a fire, heat is quickly transmitted to one or both of the fire-resistant members, and the fire-resistant function is quickly exerted. Further, since the fire-resistant members 71 and 72 are arranged so as to be separated in the thickness direction and the plane direction of the panel 1 and have an amount sufficient to close the gap of the joint portion 20, a sufficient fire-resistant function is exerted. Furthermore, when each of the fire-resistant members 71 and 72 is an airtight foam material, it is possible to provide a sufficient space for allowing foaming between the two, and thus a sufficient fire-resistant function is also exerted by this.

[0041] When each of the fire-resistant members 71 and 72 is in the state of a seal-like member or paint, the effect that it is easy to arrange the fire-resistant members 71 and 72 at desired positions can be obtained. For example, even if the surface to be arranged is bent or is in a thin groove shape, it is easy to arrange, and particularly in the case of paint, this effect is easily obtained remarkably.

[0042] Next, another embodiment of the present invention will be described with reference to FIGS. 4 to 6. FIG. 4 is a cross-sectional view of a building material panel 100 (hereinafter simply abbreviated as panel 100) according to another embodiment. FIG. 5 is a cross-sectional view showing a joint structure in which joint end portions extending in the vertical direction on both side portions of the panel 100 are joined. In both FIGS. 4 and 5, the left-right direction is the width direction of the panel 100, and each of the left and right side portions has a joint end portion. FIG. 6 is a view showing a modification in which the form of a water stop member 161 described later is changed. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified, and mainly the points different from the above embodiment will be described. FIGS. 4 to 6 show the outdoor X side (front surface side) and the indoor Y side (back surface side).

[0043] As shown in FIG. 4, the panel 100 is a metal sandwich panel in which a core material 13 with a predetermined thickness is sandwiched between a front surface material 11 and a back surface material 12 made of thin metal sheets. The panel 100 has a first joint end portion 30 and a second joint end portion 40 that are joined to each other with concavo-convex joints. As shown in FIG. 5, the first joint end portion 30 and the second joint end portion 40 are joined to form a joint portion 120 where these joint end portions 30 and 40 face each other. The joint portion 120 includes a joint formed between the joint end portions 30 and 40.

[0044] On the first joint end portion 30, a convex portion 131 extending along the longitudinal direction of the first joint end portion 30 (the front-back direction of the paper surface in FIG. 4) is formed. Further, on the end surface of the convex portion 131, an inner concave portion 132 having a reverse trapezoidal cross-section extending along the convex portion 131 is formed. The convex portion 131 is formed by reducing the thickness of the panel 100 from both sides in the thickness direction (the up-down direction in FIG. 4). The inner concave portion 132 is disposed at the center in the thickness direction of the panel 100. The portion of the convex portion 131 excluding the inner concave portion 132 is covered by the respective surface materials 11 and 12. The inner concave portion 132 is formed by processing the core material 13. The first joint end portion 30 has an end surface 135 where the core material 13 is exposed without being covered by the surface materials 11 and 12. This end surface 135 includes the bottom surface of the inner concave portion 132.

[0045] In the second joint end portion 40, a groove-shaped recess 141 extending along the longitudinal direction of the second joint end portion 40 (the front-back direction of the paper surface in FIG. 4) is formed. Further, on the bottom of the recess 141, an inner convex portion 142 having a trapezoidal cross-section extending along the longitudinal direction is formed. The recess 141 is formed by the projecting pieces 11a and 12a of the facing materials 11 and 12 that respectively project outward in the width direction of the panel 100. The inner convex portion 142 in the recess 141 is formed by processing the core material 13. Each of the projecting pieces 11a and 12a is formed by folding back the respective widthwise end portions of the facing materials 11 and 12 inward. The inner convex portion 142 is disposed at the center in the thickness direction of the panel 100. The projecting height of the inner convex portion 142 is smaller than the projecting length of each of the projecting pieces 11a and 12a, and the inner convex portion 142 does not project outward in the width direction from the recess 41. The second joint end portion 40 has an end face 145 where the core material 13 is exposed without being covered by the facing materials 11 and 12. The end face 145 includes the surface of the inner convex portion 142.

[0046] As shown in FIG. 5, the first joint end portion 30 of the other panel 100 adjacent to one panel 100 (the left side in FIG. 5) is fitted into the second joint end portion 40 of the one panel 100, and a pair of panels 100 are joined in the lateral direction. Specifically, the convex portion 131 of the first joint end portion 30 is fitted into the recess 141 of the second joint end portion 40, and the inner convex portion 142 of the second joint end portion 40 is fitted into the inner recess 132 of the first joint end portion 30. Thereby, the panels 100 are joined in the lateral direction.

[0047] Here, in this embodiment, a water stop material 161 for closing the joint portion 120 is disposed at the joint portion 120. The water stop material 161 is disposed between the first joint end portion 30 and the second joint end portion 40 and in contact with the bottom surface of the inner recess 132 and the tip surface of the inner convex portion 142, filling the gap of the joint portion 20. As the water stop material 161, the same one as the water stop material 61 in the above embodiment is used.

[0048] Also, in this embodiment, a first fireproof member 171 for closing the joint portion 20 and a second fireproof member 172 are disposed at the joint portion 20.

[0049] The first fireproof member 171 is disposed between the protruding end surface on the surface side (outdoor X side: one surface side) of the convex portion 131 at the first joint end portion 30 and the bottom portion on the surface side of the concave portion 141 at the second joint end portion 40.

[0050] The second fireproof member 172 is disposed between the protruding end surface on the back surface side (indoor Y side: the other surface side) of the convex portion 131 at the first joint end portion 30 and the bottom portion on the back surface side of the concave portion 141 at the second joint end portion 40.

[0051] The first fireproof member 171 and the second fireproof member 172 are arranged in the thickness direction of the panel 100. The first fireproof member 171 is disposed on the surface side (outdoor X side: one surface side) of the panel 1, and the second fireproof member 72 is disposed on the back surface side (indoor Y side: one surface side) of the panel 1. And the waterstop member 161 is disposed between the fireproof members 171 and 172.

[0052] The first fireproof member 171 and the second fireproof member 172 are separate members and are spaced apart in the thickness direction (vertical direction in FIG. 5) of the panel 100.

[0053] As the first fireproof member 171 and the second fireproof member 172, those similar to the first fireproof member 71 and the second fireproof member 72 of the above embodiment are used.

[0054] According to the joint structure of the panel of this embodiment, the first fireproof member 171 that closes the joint portion 20 is disposed on the surface side of the panel 100 at the joint portion 120 where the joint end portions 30 and 40 face each other, and the second fireproof member 172 that closes the joint portion 120 is disposed on the back surface side of the panel 100. The first fireproof member 171 and the second fireproof member 172 are spaced apart in the thickness direction of the panel 1.

[0055] As a result, each of the fire-resistant members 171 and 172 is close to the front surface side or the back surface side of the panel 100. Therefore, during a fire, heat is quickly transmitted to one or both of the fire-resistant members, and the fire-resistant function is quickly exerted. Further, since the fire-resistant members 171 and 172 are arranged so as to be separated from each other in the thickness direction of the panel 100 and have an amount sufficient to close the gap of the joint portion 120, a sufficient fire-resistant function is exerted. Furthermore, when each of the fire-resistant members 171 and 172 is an airtight foam material, it is possible to provide a sufficient space for allowing foaming between the two, and thus a sufficient fire-resistant function is also exerted by this.

[0056] When each of the fire-resistant members 171 and 172 is in the state of a sealing member or paint, an effect that it is easy to arrange the fire-resistant members 171 and 172 at desired positions can be obtained. For example, even if the surface to be arranged is bent or is in a narrow groove shape, it is easy to arrange, and particularly in the case of paint, it is easy to remarkably obtain the effect.

[0057] FIG. 6 shows a modification of the water stop material 161 arranged at the joint portion 120 of the above-described other embodiment. In this case, the water stop material 161 is arranged in a state of filling the entire area of the gap surrounded between the joint end portions 30 and 40 facing each other and between the first fire-resistant member 171 and the second fire-resistant member 172. According to this, the water stop effect by the water stop material 161 can be further improved.

[0058] As described above, a plurality of embodiments according to the present invention have been described. However, the present invention is not limited to these embodiments, and any form including the configuration of the present invention is also included in the present invention.

[0059] For example, the core material 13 may be an organic core material made of an organic material. Examples of the organic core material include organic resin foam materials such as polyurethane foam, polyisocyanurate foam, phenol foam, and polystyrene.

Description of Reference Numerals

[0060] 1, 100... Building material panel 11... Front surface material (face material) 12… Inner surface material (surface material) 13… Core material 20, 120… Joint 30… First joint end (joint end) 40… Second joint end (joint end) 71, 171… First fireproof member 72, 172… Second fireproof member

Claims

1. A joining structure of a building material panel having a sandwich structure with a core material sandwiched between two facing materials, wherein joining ends joined to each other by uneven fitting are joined, on one side of the building material panel of the joint portion where the joining ends face each other, a first fireproof member for closing the joint portion is arranged, on the other side of the building material panel, a second fireproof member for closing the joint portion is arranged, and the first fireproof member and the second fireproof member are spaced apart in the thickness direction of the building material panel. A joining structure of a building material panel, characterized in that.

2. The joining structure of the building material panel according to claim 1, characterized in that the first fireproof member and the second fireproof member are displaced in the plane direction of the building material panel.

3. The joining structure of the building material panel according to claim 1 or 2, characterized in that at least one of the first fireproof member and the second fireproof member is a seal-like member and is adhesively arranged on the building material panel.

4. The joining structure of the building material panel according to claim 1 or 2, characterized in that at least one of the first fireproof member and the second fireproof member is in a state of paint and is applied and arranged on the building material panel.

5. The joining structure of the building material panel according to claim 1, characterized in that the core material is either an inorganic core material made of an inorganic material or an organic core material made of an organic material.

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