Wall panel

Abstract

To provide a wall panel that can improve fire resistance of a wooden non-bearing wall.SOLUTION: A wall panel for constructing a non-bearing wall of a building includes a first wood layer that is formed of wood and arranged on one side in the thickness direction of the wall panel, a second wood layer that is formed of wood and arranged on the other side in the thickness direction of the wall panel, and an intermediate wood layer that is formed of wood and arranged between the first and second wood layers; at least either the first wood layer or the second wood layer has a flame-retardant portion impregnated at least inside with flame retardant.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a wall panel for constructing a non-load-bearing wall of a building. [Background technology]

[0002] Conventionally, various efforts have been made to improve the fire resistance of wooden walls. For example, Patent Document 1 discloses a wooden structural material that includes a load-bearing layer made of wood sufficient to support a long-term load, a fire-retardant layer arranged on the periphery of the load-bearing layer, and a burn-off layer made of wood arranged on the periphery of the fire-retardant layer. Patent Document 2 discloses a wooden building member that includes a structural part that receives a load, a covering part that covers the periphery of the structural part, and an insulating part that is layered between the structural part and the covering part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-036457 A [Patent Document 2] JP 2007-046286 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, walls may include non-load-bearing walls that are considered not to bear load as part of the structure of a building. However, the techniques disclosed in Patent Documents 1 and 2 are intended for those that are considered to bear load (structural members), and are not intended for non-load-bearing walls. In addition, non-load-bearing walls differ from load-bearing walls in terms of the structural performance and fire resistance required of a building. For this reason, it is economically unreasonable to provide non-load-bearing walls with fire resistance equivalent to that of load-bearing walls.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a wall panel that can improve the fire resistance of a wooden non-load-bearing wall. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the wall panel of the present disclosure is a wall panel for constituting a non-load-bearing wall of a building, comprising: a first wood layer arranged on one side in the thickness direction of the wall panel and made of wood; a second wood layer arranged on the other side in the thickness direction of the wall panel and made of wood; and an intermediate wood layer arranged between the first wood layer and the second wood layer and made of wood, wherein at least one of the first wood layer and the second wood layer has a flame-retardant portion impregnated at least inside with a flame retardant.

[0007] In order to achieve the above-mentioned object, the wall panel of the present disclosure is a wall panel for constituting a non-load-bearing wall of a building, comprising: a first wood layer arranged on one side of the wall panel in a thickness direction and formed of wood; a second wood layer arranged on the other side of the wall panel in the thickness direction and formed of wood; an intermediate wood layer arranged between the first wood layer and the second wood layer and formed of wood; and a non-combustible layer attached to at least one of the surface of the first wood layer opposite to the intermediate wood layer side and the surface of the second wood layer opposite to the intermediate wood layer side and formed of a non-combustible material. Effect of the Invention

[0008] According to the wall panel of the present disclosure, the fire resistance of a non-load-bearing wooden wall can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a building having a first exterior wall constituted by a wall panel according to one embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a schematic configuration of a wall panel according to one embodiment. [Diagram 3] FIG. 2 is a diagram illustrating a schematic configuration of an inner layer according to one embodiment. [Figure 4] FIG. 4 is an enlarged view for explaining a configuration of a recess according to an embodiment. [Diagram 5] FIG. 11 is a diagram showing a schematic configuration of a wall panel according to another embodiment. [Figure 6] FIG. 2 is a diagram for explaining an example of a configuration of a fireproof layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a wall panel according to an embodiment of the present disclosure will be described with reference to the drawings. The embodiment shows one aspect of the present disclosure, and does not limit the present disclosure. The embodiment can be arbitrarily modified within the scope of the technical idea of ​​the present disclosure.

[0011] <Building> Fig. 1 is a diagram showing a schematic configuration of a building 200 including a first exterior wall 100A formed of a wall panel 1 according to an embodiment. In the embodiment shown in Fig. 1, the building 200 includes an exterior wall 100, a roof 102, and a plurality of floors 104 arranged at intervals along a vertical direction D1. Specifically, the building 200 is an eight-story building built on a ground G. The building structure of the building 200 is not particularly limited, and any building structure such as wood, steel frame, reinforced concrete, or steel reinforced concrete may be used.

[0012] The building 200 is surrounded by an exterior wall 100 and a roof 102, forming an interior space 201. The exterior wall 100 includes an inner wall surface 106 facing the interior space 201 of the building 200, and an exterior wall surface 108 facing an exterior space 203 of the building 200.

[0013] In the embodiment illustrated in Fig. 1, the building 200 includes a first exterior wall 100A (100) and a second exterior wall 100B (100). The first exterior wall 100A is a non-load-bearing wall that is considered to be part of the structure of the building 200 and does not bear load (is not considered effective in terms of structural design). The first exterior wall 100A may be formed of one wall panel 1, which will be described later, or may be formed by connecting multiple wall panels 1 to each other.

[0014] The second exterior wall 100B is a load-bearing wall among the walls of the building 200 that is considered to bear the load as part of the structure of the building 200, and resists both horizontal forces due to earthquakes and the like, and vertical forces due to the weight of the building 200 and the like. The second exterior wall 100B may be connected to the roof 102 and the floor 104 via beams 112, or may be connected to the roof 102 and the floor 104 without the beams 112.

[0015] 1, the building 200 further includes an inner wall 110 (partition wall) that divides the inner space 201 and is a non-load-bearing wall. Note that the building 200 may include an inner wall (partition wall) that divides the inner space 201 and is a load-bearing wall.

[0016] <Wall Panel> (composition) The configuration of a wall panel 1 according to one embodiment will be described. Fig. 2 is a diagram showing a schematic configuration of a wall panel 1 according to one embodiment. As described above, the wall panel 1 constitutes a non-load-bearing wall (first exterior wall 100A) of a building 200. Such a wall panel 1 includes a first wood layer (outer layer 2), a second wood layer (inner layer 4), and an intermediate wood layer 6, as shown in Fig. 2.

[0017] The outer layer 2 is disposed on one side (the outer space 203 side) of the thickness direction D2 of the wall panel 1. Specifically, the outer layer 2 is disposed facing the outer space 203 of the building 200. The outer layer 2 is formed of wood W. Specifically, the outer layer 2 is formed of a wood material in which a plurality of long pieces of wood W are stacked on top of each other along the short side direction of the wood W, so-called NLT (Nail Laminated Timber), so as to have a board shape. In one embodiment, the fiber direction D3a of the wood W forming the outer layer 2 extends along the up-down direction D1. In some embodiments, the outer layer 2 is formed of laminated wood or CLT (Cross Laminated Timber).

[0018] In one embodiment, as illustrated in FIG. 2, the outer layer 2 has a weather-resistant paint 10 applied to a surface 8 on the outer space 203 side. The weather-resistant paint 10 is not particularly limited, but may be, for example, a paint containing a silicone resin. The weather-resistant paint 10 has transparency so that the wood W forming the outer layer 2 can be seen. In the present disclosure, the surface 8 of the outer layer 2 faces the outer space 203, and the back surface 20 of the outer layer 2 faces the intermediate wood layer 6. Although not shown, in some embodiments, the outer layer 2 has a metal plate (e.g., Galvalume Steel Plate (registered trademark)) attached to the surface 8 instead of or together with the weather-resistant paint 10. The weather-resistant paint 10 is not limited to a transparent paint, and may be a color paint.

[0019] The inner layer 4 is disposed on the other side (the inner space 201 side) of the thickness direction D2 of the wall panel 1. Specifically, the inner layer 4 is disposed facing the inner space 201 of the building 200. This inner layer 4 is formed of wood W. Like the outer layer 2, the inner layer 4 is formed of NLT so as to have a board shape. In one embodiment, the fiber direction D3b of the wood W forming the inner layer 4 extends along the vertical direction D1. In some embodiments, the inner layer 4 is formed of laminated lumber or CLT. The outer layer 2 and the inner layer 4 may be formed of wood W of the same tree species, or may be formed of wood W of different tree species. In the present disclosure, the surface 14 of the inner layer 4 faces the inner space 201, and the back surface 16 of the inner layer 4 faces the intermediate wood layer 6.

[0020] The intermediate wood layer 6 is disposed between the outer layer 2 and the inner layer 4 in the thickness direction D2. The intermediate wood layer 6 is formed of wood W. The intermediate wood layer 6 is formed of NLT to have a board shape, similar to the outer layer 2 and the inner layer 4. In one embodiment, the fiber direction D3c of the wood W forming the intermediate wood layer 6 extends along the thickness direction D2 and intersects with the fiber direction D3a of the outer layer 2 and the fiber direction D3b of the inner layer 4. In one embodiment, the outer layer 2, the inner layer 4, and the intermediate wood layer 6 each have the same size in the thickness direction D2, for example, 20 mm. In some embodiments, the intermediate wood layer 6 is formed of sawn board, laminated timber, or CLT. The outer layer 2, the inner layer 4, and the intermediate wood layer 6 may each be formed of wood W of the same tree species, or may each be formed of wood W of different tree species. For example, the outer layer 2 and the inner layer 4 are made of Scots pine, and the middle wood layer 6 is made of Japanese cedar.

[0021] In one embodiment, the intermediate wood layer 6 is adhered to a back surface 16 opposite to the front surface 14 on the inner space 201 side (the other side in the thickness direction D2) of the inner layer 4 via a flame-retardant adhesive 12. Furthermore, the intermediate wood layer 6 is adhered to a back surface 20 opposite to the front surface 8 of the outer layer 2 via a flame-retardant adhesive 12. The flame-retardant adhesive 12 is, for example, a resorcinol resin-based adhesive or an aqueous polymeric isocyanate-based adhesive.

[0022] As shown in FIG. 2, the inner layer 4 according to the present disclosure has a flame retardant portion 30 impregnated with a flame retardant X formed therein. The flame retardant X is, for example, a phosphorus-based flame retardant, a nitrogen-based flame retardant, a phosphorus-nitrogen-based flame retardant, or a boric acid-based flame retardant. In one embodiment, the flame retardant portion 30 is located on the inner space 201 side of the inner layer 4. In one embodiment, the inner layer 4 also has a flame retardant portion 30 formed on the surface 14. Although not shown, in some embodiments, a flame retardant film formed of the flame retardant X is provided on the surface 14 of the inner layer 4.

[0023] FIG. 3 is a diagram showing a schematic configuration of the inner layer 4 according to one embodiment, as viewed from the inner space 201 side of the building 200. In one embodiment, as shown in FIG. 3, the inner layer 4 has a plurality of recesses 24 having openings 22 on the surface 14 on the inner space 201 side. The plurality of recesses 24 are formed on the surface 14 of the inner layer 4 at a density of 500 to 10,000 pieces / m2. Preferably, the plurality of recesses 24 are formed on the surface 14 of the inner layer 4 at a density of 1,000 to 5,000 pieces / m2. The openings 22 of the recesses 24 have a rectangular shape and are elongated along the fiber direction D3b of the inner layer 4. Note that the present disclosure does not limit the openings 22 of the recesses 24 to a rectangular shape. In some embodiments, the openings 22 of the recesses 24 have an oval shape such as an ellipse. In some embodiments, the openings 22 of the recesses 24 have a longitudinal shape along a direction (left-right direction D4) perpendicular to the fiber direction D3b of the inner layer 4.

[0024] In one embodiment, as shown in Fig. 3, the multiple recesses 24 include a first recess 24A (24) and a second recess 24B (24) adjacent to the first recess 24A in the vertical direction D1. If the direction perpendicular to the vertical direction D1 on the paper surface of Fig. 3 is the horizontal direction D4, the first recess 24A and the second recess 24B are shifted from each other (do not overlap) in the horizontal direction D4. In some embodiments, the first recess 24A and the second recess 24B at least partially overlap each other in the horizontal direction D4.

[0025] In one embodiment, as shown in FIG. 3, the plurality of recesses 24 include a plurality of first recesses 24A that are spaced apart from each other along the left-right direction D4 and overlap each other in the up-down direction D1. Similarly, the plurality of recesses 24 include a plurality of second recesses 24B that are spaced apart from each other along the left-right direction D4 and overlap each other in the up-down direction D1. The plurality of first recesses 24A and the plurality of second recesses 24B are offset from each other in the up-down direction D1. Thus, in one embodiment, the plurality of recesses 24 are arranged over the entire surface 14 of the inner layer 4.

[0026] FIG. 4 is an enlarged view for explaining the configuration of the recess 24 according to one embodiment, and is a cross-sectional view obtained by cutting a part of the inner layer 4 along the up-down direction D1 of the inner layer 4. In one embodiment, as shown in FIG. 4, the flame-retardant portion 30 is formed at least around the recess 24. The flame-retardant portion 30 is also formed on the surface of the recess 24. When the thickness of the inner layer 4 is t1 and the depth of the recess 24 is d, 0.1 < d / t1 < 0.7 is satisfied.

[0027] (Function and Effect) The function and effect of the wall panel 1 according to one embodiment will be described. According to one embodiment, the flame-retardant portion 30 is formed inside and on the surface 14 of the inner layer 4 of the wall panel 1. Therefore, the fire resistance of the first outer wall 100A, which is a non-load-bearing wooden wall, can be improved.

[0028] According to one embodiment, since the wall panel 1 constitutes a non-load-bearing wall of the building 200, unlike the case of constituting a load-bearing wall of the building 200, the intermediate wooden layer 6 can be designed without being restricted by structural design. And since the flame-retardant portion 30 is formed inside the inner layer 4, the intermediate wooden layer 6 can be thinned, the wall panel 1 can be thinned, or the weight can be reduced by the amount of improvement in the fire resistance of the wall panel 1 due to the formation of the flame-retardant portion 30.

[0029] According to one embodiment, the wall panel 1 is applied to the first exterior wall 100A, and the flame retardant portion 30 is located closer to the inner space 201 of the building 200 than the intermediate wood layer 6. Therefore, when a fire breaks out in the inner space 201 of the building 200, the fire will affect the inner layer 4 including the flame retardant portion 30, the intermediate wood layer 6, and the outer layer 2 in that order, making it easier to achieve a predetermined fire resistance performance (e.g., not burning down within 30 minutes when a fire breaks out) of the first exterior wall 100A. In addition, the outer layer 2 faces the outer space 203 of the building 200, and the inner layer 4 faces the inner space 201 of the building 200. In other words, the fire resistance of the first exterior wall 100A, which has wood W visible on both sides (wood W is visible on both sides), can be improved.

[0030] According to one embodiment, the structure of the wood W forming the inner layer 4 is destroyed by forming a plurality of recesses 24 on the surface 14 of the inner layer 4. This promotes impregnation of the flame retardant X from the surface 14 of the inner layer 4 to the inside, and the formation of the flame retardant portion 30 is quickly performed. This allows the productivity of the wall panel 1 to be improved.

[0031] Although the formation of the recesses 24 on the surface 14 of the inner layer 4 can promote the impregnation of the flame retardant X from the surface 14 of the inner layer 4 to the inside, if there are too many recesses 24, there is a risk that the manufacturing cost of the wall panel 1 will increase. According to one embodiment, the multiple recesses 24 satisfy a density of 500 to 10,000 pcs / m2, so that the productivity of the wall panel 1 can be increased while suppressing an increase in the manufacturing cost of the wall panel 1.

[0032] Conventionally, as a method for impregnating the inside of wood W with a flame retardant X, there is a method of pressurizing and injecting the flame retardant X into wood W placed in a canister. However, when applying the pressurized injection method, a large-sized facility such as a canister for decompressing and pressurizing the wood is required. In contrast, in this embodiment, the flame retardant X is applied to the surface 14 of the inner layer 4 on which a plurality of recesses 24 are formed (insing treatment is applied), so that the inner layer 4 including the flame retardant portion 30 can be manufactured without pressurized injection. Therefore, according to one embodiment, a plurality of recesses 24 satisfying a density of 500 to 10,000 pieces / m2 are formed on the surface 14 of the inner layer 4 (insing treatment is applied), so that a large-sized facility for decompressing and pressurizing is not required, and the facility can be made compact.

[0033] Furthermore, when the flame retardant X is injected into the wood W under pressure, in addition to the time required for the pressure injection, a long drying time for the wood W after the chemical injection is required, which lengthens the manufacturing period of the inner layer 4 including the flame retardant portion 30. In contrast, according to an embodiment in which the incising process is performed, the inner layer 4 is manufactured by forming a plurality of recesses 24 and applying the flame retardant X thereto. The presence of the plurality of recesses 24 can also significantly shorten the drying time, thereby shortening the manufacturing period of the inner layer 4. Note that the present disclosure does not limit the manufacturing of the inner layer 4 to applying the flame retardant X after the incising process. In some embodiments, the inner layer 4 is manufactured by applying the flame retardant X without performing the incising process.

[0034] The inner layer 4 formed of the wood W often has a longitudinal shape along the fiber direction D3b of the inner layer 4. According to one embodiment, the opening 22 of the recess 24 has a longitudinal shape along the fiber direction D3b of the inner layer 4, so that the fiber direction D3b of the inner layer 4 and the longitudinal direction of the opening 22 of the recess 24 are aligned with each other, thereby making it possible to easily form the recess 24 in the inner layer 4. For example, when forming the recess 24 in the inner layer 4, the number of times the inner layer 4 is passed between a pair of rotating crushing blades can be reduced.

[0035] According to one embodiment, the flame retardant X contains a phosphorus-based flame retardant, a nitrogen-based flame retardant, a phosphorus-nitrogen-based flame retardant, or a boric acid-based flame retardant, so that when a fire occurs, the thermal decomposition of the wood W forming the inner layer 4 can be delayed. To explain in detail using an example in which the flame retardant X is a phosphorus-nitrogen-based flame retardant, when a fire occurs, the phosphorus component forms a carbonized layer before the thermal decomposition of the wood W of the inner layer 4. Furthermore, the nitrogen component foams, dilutes the flammable gas, and expands the carbonized layer. Therefore, it is possible to provide a first exterior wall 100A (non-load-bearing wall) that can protect the members (the outer layer 2 and the intermediate wood layer 6) of the wall panel 1 located on the outer space 203 side from the flame retardant portion 30.

[0036] In one embodiment, as illustrated in Fig. 2, the flame-retardant portion 30 is located on the inner space 201 side of the inner layer 4 (inside and surface 14 of the inner layer 4), but the present disclosure is not limited to this form. The flame-retardant portion 30 may be formed at least inside the inner layer 4.

[0037] According to one embodiment, the intermediate wood layer 6 is bonded to the back surface 16 of the inner layer 4 and the back surface 20 of the outer layer 2 via a flame-retardant adhesive 12. This allows both the outer layer 2 and the inner layer 4 to be bonded to the intermediate wood layer 6, and increases the fire resistance of the first exterior wall 100A. Furthermore, since the intermediate wood layer 6 is made of wood W, it is possible to improve adhesion to the outer layer 2 and the inner layer 4 and to more closely integrate the outer layer 2 and the inner layer 4, compared to when the intermediate wood layer 6 is made of a noncombustible material M, as described below. According to one embodiment, a weather-resistant paint 10 is applied to the surface 8 of the outer layer 2, which makes it possible to suppress damage to the outer layer 2 due to weather.

[0038] A wall panel 1A according to another embodiment will be described. Fig. 5 is a diagram showing a schematic configuration of the wall panel 1A according to another embodiment. In the embodiment shown in Fig. 5, the wall panel 1A has a noncombustible layer 120 instead of the flame-retardant portion 30 of the wall panel 1 described with reference to Fig. 2. In the embodiment shown in Fig. 5, the same components as those in the above-mentioned embodiment are given the same reference symbols, and their description will be omitted.

[0039] In the embodiment illustrated in FIG. 5, the noncombustible layer 120 is attached to the surface 14 of the inner layer 4. This noncombustible layer 120 covers the entire surface 14 of the inner layer 4. The noncombustible layer 120 is formed of a noncombustible material M, and may be, for example, a gypsum board formed mainly of gypsum, or a noncombustible sheet. The noncombustible layer 120 includes a plurality of first plate-shaped members 122 attached to the surface 14 of the inner layer 4, and a second plate-shaped member 124 located on the opposite side of the first plate-shaped member 122 from the inner layer 4 side in the thickness direction D2. The plurality of first plate-shaped members 122 include a lower first plate-shaped member 122 and an upper first plate-shaped member 122 located above the lower first plate-shaped member 122. The second plate-shaped member 124 is arranged so as to overlap both the lower first plate-shaped member 122 and the upper first plate-shaped member 122 in the vertical direction D1. Although not shown, in some embodiments, a fire-retardant layer 120 is attached to surface 14 of outer layer 2 .

[0040] According to the configuration illustrated in Fig. 5, the wall panel 1A includes a non-combustible layer 120 attached to the surface 14 of the inner layer 4. This improves the fire resistance of the wooden non-load-bearing wall. Furthermore, according to the configuration illustrated in Fig. 5, the lower first plate-like member 122 and the upper first plate-like member 122 are connected to each other via the second plate-like member 124, so that the non-combustible layer 120 can stand on its own. In particular, even if the portion of the wall panel 1A closer to the intermediate wood layer 6 than the non-combustible layer 120 is damaged by fire, the non-combustible layer 120 can stand on its own.

[0041] FIG. 6 is a diagram for explaining an example of the configuration of the noncombustible layer 120, and the noncombustible layer 120 is viewed from the inner space 201 side. In the embodiment illustrated in FIG. 6, the noncombustible layer 120 includes six first plate-shaped members 122 and two second plate-shaped members 124. The six first plate-shaped members 122 are arranged in two stages in the vertical direction D1. The lower stage of the six first plate-shaped members 122 includes three first plate-shaped members 122A, 122B, and 122C arranged along the left-right direction D4. The three first plate-shaped members 122A, 122B, and 122C are arranged at the same positions as each other in the vertical direction D1. The upper stage of the six first plate-shaped members 122 includes three first plate-shaped members 122D, 122E, and 122F arranged along the left-right direction D4. The three first plate-shaped members 122D, 122E, 122F are disposed at the same positions relative to one another in the up-down direction D1.

[0042] The first plate-shaped member 122A and the first plate-shaped member 122D are arranged to be in the same position as each other in the left-right direction D4. The first plate-shaped member 122B and the first plate-shaped member 122E are arranged to be in the same position as each other in the left-right direction D4. The first plate-shaped member 122C and the first plate-shaped member 122F are arranged to be in the same position as each other in the left-right direction D4.

[0043] The two second plate-shaped members 124 include a left second plate-shaped member 124A (124) arranged along the left-right direction D4, and a right second plate-shaped member 124B (124) arranged on the right side of the second plate-shaped member 124A in the left-right direction D4. The right side in the left-right direction D4 refers to the right side on the paper surface of FIG. 6. Each of the left second plate-shaped member 124A and the right second plate-shaped member 124B is arranged so as to overlap with a common first plate-shaped member 122. In the embodiment illustrated in FIG. 6, the common first plate-shaped member 122 is both the first plate-shaped member 122B and the first plate-shaped member 122E. In some embodiments, each of the multiple first plate-shaped members 122 and the multiple second plate-shaped members 124 is arranged in a staggered manner when viewed from the thickness direction D2. In the embodiment illustrated in FIG. 6, at least one second plate-shaped member 124 covers a portion of the multiple first plate-shaped members 122, but at least one second plate-shaped member 124 may cover the entirety of the multiple first plate-shaped members 122.

[0044] The contents described in each of the above embodiments can be understood, for example, as follows.

[0045] [1] The wall panel (1) according to the present disclosure is A wall panel for constituting a non-load-bearing wall of a building (200), A first wood layer (2) is arranged on one side of the wall panel in the thickness direction (D2) and is made of wood (W); A second wood layer (4) is arranged on the other side of the wall panel in the thickness direction and is made of wood; an intermediate wood layer (6) disposed between the first wood layer and the second wood layer and formed of wood; At least one of the first wood layer and the second wood layer is formed with a flame retardant portion (30) impregnated with a flame retardant (X) at least inside.

[0046] According to the configuration described in [1] above, the wall panel has a flame-retardant portion formed inside at least one of the first and second wood layers, which improves the fire resistance of the wooden non-load-bearing wall.

[0047] Furthermore, according to the configuration described in [1] above, since the wall panel constitutes a non-load-bearing wall of a building, the intermediate wood layer can be made thin without being subject to structural design restrictions, unlike when the wall panel constitutes a load-bearing wall of a building. Furthermore, since a flame-retardant portion is formed inside at least one of the first and second wood layers, the intermediate wood layer can be made thinner by the amount of the improvement in fire resistance of the wall panel due to the formation of the flame-retardant portion, making it possible to make the wall panel thinner and lighter.

[0048] [2] In some embodiments, in the configuration described in [1] above, The first wood layer is arranged facing the outer space (203) of the building, The second wood layer is arranged facing the inner space (201) of the building, The flame-retardant portion is formed inside the second wood layer.

[0049] According to the configuration described in [2] above, the wall panel is applied to an exterior wall. The flame-retardant portion is located closer to the interior space of the building than the intermediate wood layer, so that when a fire breaks out in the interior space of the building, the fire will affect the flame-retardant portion and the intermediate wood layer in that order, making it easier to achieve a predetermined fire resistance performance for the exterior wall (for example, not burning down within 30 minutes when a fire breaks out). Furthermore, according to the configuration described in [2] above, it is possible to improve the fire resistance of an exterior wall that has visible wood on both sides (wood is exposed).

[0050] [3] In some embodiments, in the configuration described in [2] above, The second wood layer has a plurality of recesses (24) recessed from a surface (14) on the inner space side, The flame retardant portion is formed at least around the recess.

[0051] According to the configuration described in [3] above, by forming recesses on the surface of the second wood layer, the structure of the wood that forms the second wood layer is destroyed, and the impregnation of the flame retardant from the surface to the inside of the second wood layer is promoted, thereby improving the productivity of the wall panel.

[0052] [4] The wall panel according to the present disclosure is A wall panel (1A) for constituting a non-load-bearing wall of a building, A first wood layer is arranged on one side of the wall panel in the thickness direction and is made of wood; A second wood layer is arranged on the other side of the wall panel in the thickness direction and is made of wood. an intermediate wood layer disposed between the first wood layer and the second wood layer and formed of wood; The insulating layer (120) is attached to at least one of the surface of the first wood layer opposite the intermediate wood layer side and the surface of the second wood layer opposite the intermediate wood layer side, and is formed from a non-combustible material (M).

[0053] According to the configuration described in [4] above, the wall panel has a non-combustible layer attached to at least one of the surfaces of the first wood layer and the second wood layer, thereby improving the fire resistance of the wooden non-load-bearing wall.

[0054] [5] In some embodiments, in the configuration described in [4] above, The first wood layer is arranged facing the exterior space of the building, The non-combustible layer includes a plurality of first plate-shaped members (122) attached to the surface of the second wood layer, and at least one second plate-shaped member (124) located on the opposite side of the first plate-shaped members from the second wood layer in the thickness direction, The at least one second plate-shaped member is disposed so as to overlap each of the at least two first plate-shaped members.

[0055] According to the configuration described in [5] above, the two first plate-shaped members are connected to each other via the second plate-shaped member, so that the fire-retardant layer can be made to stand on its own.

[0056] [6] In some embodiments, in the configuration described in [5] above, Each of the plurality of second plate-shaped members is disposed so as to overlap a common first plate-shaped member.

[0057] According to the configuration described in [6] above, the fireproof layer can be made to stand on its own more firmly. [Explanation of symbols]

[0058] 1 Wall panel (one embodiment) 1A Wall Panel (Another Embodiment) 2 outer layer 4 Inner layer 6 Intermediate woody layer 8. Outer surface 10 Weather-resistant paint 12 Flame retardant adhesives 14 Surface of the inner layer 16 Back side of inner layer 20 Back of outer layer 22 Aperture 24 Recess 24A First recess 24B Second recess 30 Flame Retardant Section 100 Exterior Wall 100A First outer wall 100B Second outer wall 102 Roof 104 Beds 106 Inner Wall 108 Exterior wall 110 Interior wall 112 Beam 120 Fireproof layer 122 First plate-shaped member 124 Second plate-shaped member 200 Buildings 201 Inner Space 203 Outside space D1 Vertical direction D2 Thickness direction D3a Fiber direction of outer layer D3b Fiber direction of inner layer D3c Fiber direction of middle wood layer D4 Left / right direction G ground M Noncombustible material W wood X Flame retardant

Claims

1. A wall panel for constituting a non-load-bearing wall of a building, A first wood layer is arranged on one side of the wall panel in a thickness direction and is made of wood; A second wood layer is arranged on the other side of the wall panel in the thickness direction and is made of wood. an intermediate wood layer disposed between the first wood layer and the second wood layer and formed of wood; At least one of the first wood layer and the second wood layer has a flame retardant portion impregnated with a flame retardant at least inside. Wall panel.

2. The first wood layer is arranged facing the exterior space of the building, The second wood layer is arranged facing the interior space of the building, The flame-retardant portion is formed inside the second wood layer.

2. The wall panel of claim 1.

3. The second wood layer has a plurality of recesses formed therein that are recessed from a surface facing the inner space, The flame retardant portion is formed at least around the recess.

3. The wall panel of claim 2.

4. A wall panel for constituting a non-load-bearing wall of a building, A first wood layer is arranged on one side of the wall panel in a thickness direction and is made of wood; A second wood layer is arranged on the other side of the wall panel in the thickness direction and is made of wood. an intermediate wood layer disposed between the first wood layer and the second wood layer and formed of wood; a non-combustible layer attached to at least one of a surface of the first wood layer opposite to the intermediate wood layer side and a surface of the second wood layer opposite to the intermediate wood layer side, the non-combustible layer being made of a non-combustible material; Wall panel.

5. The first wood layer is arranged facing the exterior space of the building, The non-combustible layer includes a plurality of first plate-shaped members attached to the surface of the second wood layer, and at least one second plate-shaped member located on the opposite side of the first plate-shaped members from the second wood layer in the thickness direction, The at least one second plate-like member is disposed so as to overlap each of the at least two first plate-like members.

5. A wall panel according to claim 4.

6. Each of the second plate-like members is disposed so as to overlap a common first plate-like member.

6. A wall panel according to claim 5.

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