Fire-resistant structure and reinforcement for joint part of exterior wall panel

Abstract

To improve fire resistance of building exterior walls using sandwich panels.SOLUTION: A fire-resistant structure of joint parts (21) of an exterior wall panel includes a first joint member (4) arranged on the exterior side of the joint part, a second joint member (5) arranged on the interior side of the joint part, and a fastener (6). The first joint member integrally includes an exterior covering part (42) that covers the joint part and an exterior abutment part (41) that contacts the exterior surface of the exterior wall panel. The second joint member integrally includes an interior covering part (52) that covers the joint part and an interior abutment part (51) that contacts the interior surface of the exterior wall panel. The fastener connects the exterior covering part and the interior covering part that face each other at the joint part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant structure and reinforcement for joints of exterior wall panels, and more particularly to a fire-resistant structure and reinforcement for joints of exterior wall panels covered with steel plates on both the indoor and outdoor sides. [Background technology]

[0002] Metal sandwich exterior wall panels are sometimes used in steel-frame buildings such as logistics facilities. These exterior wall panels are covered with steel plates on both the indoor and outdoor sides. A fire-resistant joint structure for this type of exterior wall panel (hereinafter also referred to as a "sandwich panel") is proposed in JP 2016-94790 A (Patent Document 1).

[0003] The fire-resistant structure of Patent Document 1 is characterized by having non-combustible insulation material arranged across the entire width between adjacent furring strips via vertical joints, and an insulation material holding member that holds down the non-combustible insulation material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-94790 A (Patent No. 6511252) Summary of the Invention [Problem to be solved by the invention]

[0005] Because the exterior surface of a sandwich panel is covered with steel plates, when heated from the exterior, the steel plates thermally deform, causing the edges to warp (lift up). In this case, the joints tend to expand, accelerating the combustion of the core material inside, so even if non-combustible sealant is filled into the joints (vertical joints), the fire resistance is insufficient.

[0006] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a fire-resistant joint structure that can improve the fire resistance performance of joints between exterior wall panels such as sandwich panels with a simple configuration.

[0007] Another object is to provide a reinforcing tool that can be applied to joints between exterior wall panels. [Means for solving the problem]

[0008] A joint fireproof structure according to one aspect of the present invention is a fireproof structure for a joint of an exterior wall panel, and includes a first joint member arranged on the outdoor side of the joint, a second joint member arranged on the indoor side of the joint, and a fastener. The first joint member integrally includes an outdoor covering portion that covers the joint and an outdoor abutting portion that contacts the outdoor surface of the exterior wall panel. The second joint member integrally includes an indoor covering portion that covers the joint and an indoor abutting portion that contacts the indoor surface of the exterior wall panel. The fastener connects the outdoor covering portion and the indoor covering portion that face each other at the joint, with the outdoor abutting portion and the indoor abutting portion clamping the end of the exterior wall panel in the thickness direction.

[0009] Preferably, the first joint member has a hat-shaped cross section, and the outdoor covering portion is formed by a convex portion that protrudes further toward the indoor side than the pair of outdoor abutting portions.

[0010] Preferably, the second joint member has a hat-shaped cross section, and the indoor covering portion is configured by a convex portion that protrudes further toward the outdoor side than the pair of indoor abutting portions.

[0011] Preferably, a heat insulating space is provided between the exterior covering portion of the first joint member and the interior covering portion of the second joint member. The heat insulating space is desirably located closer to the exterior in the thickness direction of the exterior wall panel.

[0012] More preferably, the joint fire-resistant structure further comprises a thermally expandable fire-resistant material disposed in the heat-insulating space and attached to the covering portion of the first joint member or the facing portion of the second joint member.

[0013] Preferably, the indoor contact portion of the second joint member is fixed to the furring strip, and the second joint member also serves as a waterproofing material.

[0014] In a configuration in which the exterior wall panel is a sandwich panel covered with steel plates on both the outdoor and indoor sides, the outdoor abutment portion of the first joint member contacts the end surface of the outdoor steel plate of the sandwich panel, and the indoor abutment portion of the second joint member contacts the end surface of the indoor steel plate of the sandwich panel.

[0015] A reinforcement according to one aspect of the present invention is a reinforcement to be applied to a joint portion of an exterior wall panel, and includes the above-mentioned first joint member, second joint member, and fastener. [Effects of the Invention]

[0016] According to the present invention, the fire resistance of the joints between exterior wall panels can be improved with a simple configuration.

[0017] Furthermore, when the exterior wall panel is a sandwich panel covered with steel plates on both the indoor and outdoor sides, the first joint member can press down the edge of the outdoor steel plate adjacent to the joint, preventing the edge of the steel plate from lifting up due to thermal deformation of the outdoor steel plate when heated from outside. This allows the edge of the outdoor steel plate to be reinforced by the first joint member, improving the fire resistance of the joint between the sandwich panels. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a front view schematically showing a building exterior wall that employs a joint fireproof structure according to an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view schematically showing a joint fire-resistant structure according to an embodiment of the present invention. [Figure 3] 1 is a perspective view schematically showing a joint fireproof structure according to an embodiment of the present invention; [Figure 4]10 is a cross-sectional view schematically showing a joint fireproof structure according to a modified example of an embodiment of the present invention, illustrating another example of the configuration of a reinforcing member. FIG. [Figure 5] FIG. 10 is a cross-sectional view schematically showing a joint fireproof structure according to a modified example of an embodiment of the present invention, showing a state during heating. [Figure 6] 10A and 10B are diagrams showing still another configuration example of a reinforcing tool. [Figure 7] FIG. 1 is a front view schematically showing a known building exterior wall to which sandwich panels are applied. [Figure 8] FIG. 1 is a front view showing a schematic diagram of a known joint structure between sandwich panels. [Figure 9] FIG. 1 is a schematic diagram for explaining the fire resistance of a known joint structure. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0020] <About the overview> First, an outline of the fire-resistant structure of the joints between exterior wall panels will be described. In this embodiment, a fire-resistant structure in the case where sandwich panels are used as exterior wall panels will be described.

[0021] FIG. 1 is a front view (viewed from the outdoor side) showing a state in which a reinforcing element 3 is installed in a joint (vertical joint) 21 between sandwich panels 1. FIG. 2 is a cross-sectional view schematically showing the fire-resistant structure of the joint, showing an enlarged cross section of part II surrounded by a dashed line in FIG. 1. In these figures, arrow A1 indicates the vertical direction of the sandwich panel 1, and arrow A2 indicates the width direction (left-right direction) of the sandwich panel 1. Arrow A3 in FIG. 2 indicates the indoor side of the depth direction of the sandwich panel 1.

[0022] First, we will briefly explain the arrangement and basic structure of the sandwich panel 1. As shown in Figure 1, a plurality of sandwich panels 1 are aligned in the up-down direction (vertical direction) and the left-right direction (horizontal direction) to form the exterior wall of a building. Vertical joints 21 (see Figure 7 described later) are formed between the left and right sandwich panels 1, and horizontal joints 22 are formed between the upper and lower sandwich panels 1.

[0023] As shown in Fig. 2, sandwich panel 1 is an exterior wall panel covered on both the outdoor and indoor sides with steel plates 11, 12 (shown by thick lines in Fig. 2 etc.). Core material 13 of sandwich panel 1 is made of an organic heat insulating material such as rock wool, and is integrated with steel plates 11, 12. In other words, steel plates 11, 12 are bonded to core material 13. Thickness dimension D1 of sandwich panel 1 in this embodiment is relatively large, and is assumed to be, for example, about 100 mm.

[0024] An end 11a of the outdoor-side steel plate 11 (hereinafter referred to as the "outdoor-side steel plate") adjacent to the vertical joint 21 is bent into an L shape, and the bent piece 11b is bonded to a part of the side end surface 13a of the core material 13. On the other hand, an end 12a of the indoor-side steel plate (hereinafter referred to as the "indoor-side steel plate") 12 is not bent, and the remaining part of the side end surface 13a of the core material 13 is exposed. A fire-resistant plate material such as gypsum board may be attached to the side end surface 13a of the core material 13. The end 12a of the indoor-side steel plate 12 may also be bent into an L shape.

[0025] Vertically connected sandwich panels 1 are connected by fitting their upper and lower ends together. For example, a protrusion is formed on the upper end surface, and a groove for receiving the protrusion is formed on the lower end surface (not shown). A furring strip 14 is disposed on the interior side of the sandwich panel 1, and the upper end of each sandwich panel 1 is fixed to the furring strip 14 with a fastener 15 such as a screw. When the sandwich panels 1 are installed, the fastener 15 is concealed by a downward protrusion 1b formed on the lower end of the upper sandwich panel 1. The downward protrusion 1b overlaps a recess 1a formed on the upper end of the sandwich panel 1 in the inward / outward direction. As shown in Figure 1 , the portion of the recess 1a not covered by the downward protrusion 1b of the upper sandwich panel 1 (exposed portion) forms a horizontal joint 22.

[0026] On the other hand, consecutive sandwich panels 1 do not overlap in the left-right direction, and the gap between two adjacent sandwich panels 1 in the left-right direction forms a vertical joint 21. In this embodiment, furring strips 14 are arranged at positions (joint centers) corresponding to the vertical joints 21. The furring strips 14 are typically square steel, and the side facing the exterior forms the mounting surface 14a. The above-mentioned fasteners 15 are passed through the end of the recessed portion 1a (upper end) of the sandwich panel 1 and fixed to the mounting surface 14a of the furring strips 14.

[0027] Here, comparative examples of the fire-resistant structure of the vertical joint 21 in this embodiment are shown in FIGS. 7 and 8. FIGS. 7 and 8 correspond to FIGS. 1 and 2, respectively, and FIG. 8 shows an enlarged cross-section of portion VIII enclosed by a dashed line in FIG. 7. As shown in FIGS. 7 and 8, in known joint structures, a wet or dry non-combustible sealant 131 is filled in the vertical joint 21 between sandwich panels 1. Also, as shown in FIG. 8, a sheet-like or thin-plate-like water-stopping material 132 is provided on the back side (indoor side) of the sandwich panel 1. The water-stopping material 132 is attached to the entire mounting surface 14a of the furring strip 14. For ease of understanding, a gap is provided between the sealant 131 and the side end surface 13a of the core material 13 in FIG. 8.

[0028] In this case, when the exterior wall of a building is heated from the outdoor side as shown in FIG. 9(A), the outdoor steel plate 11 warps over time due to thermal deformation. As shown in FIG. 9(B), the ends 11a of the outdoor steel plate 11 on both sides of the vertical joint 21 rise up away from the core material 13. In this case, the gap between the raised ends 11a of the outdoor steel plate 11 and the core material 13 becomes a heat path, promoting combustion of the core material 13. Therefore, even if a non-combustible sealant 131 is filled in the vertical joint 21, the heat from burning the core material 13 may reach the back side of the sandwich panel 1 and cause a flame to break out indoors. Specifically, a flame may break out from a tiny gap between the indoor-side steel plate 12 of the sandwich panel 1 and the mounting surface 14a (waterstop material 132) of the furring strip 14.

[0029] In contrast, the fire-resistant structure of this embodiment is provided with reinforcing members 3 applied to the vertical joints 21, thereby making it possible to suppress lifting (thermal deformation) of the ends 11a of the exterior-side steel plates 11 during heating. The reinforcing members 3 will be described in detail below.

[0030] <Example of reinforcement configuration> An example of the configuration of a reinforcing member 3 according to this embodiment will be described with reference to Figures 2 and 3. Figure 3 is a perspective view that schematically shows the fire-resistant structure of the joints between sandwich panels 1.

[0031] As shown in Figures 2 and 3, the reinforcing element 3 includes a first joint member 4 and a second joint member 5 arranged facing each other in the depth direction across the vertical joint 21, and a fastener 6 that connects (fastens) the first joint member 4 and the second joint member 5.

[0032] The first and second joint members 4, 5 are both made of metal (non-combustible) plates that are long in the vertical direction (see FIG. 1 ), and their thickness is, for example, equal to or greater than the thickness of the steel plates 11, 12 of the sandwich panel 1. The width dimension of the first and second joint members 4, 5 is typically approximately the same as the width dimension of the mounting surface 14a of the furring strip 14. Note that the material of the first and second joint members 4, 5 is not limited to metal, as long as it is a hard member that has fire resistance. Furthermore, the first and second joint members 4, 5 are not limited to being formed in a plate shape.

[0033] (First joint member) The first joint member 4 is disposed on the outdoor side of the vertical joint 21. The first joint member 4 integrally includes a covering portion (outdoor covering portion) 42 that covers the vertical joint 21 and a contact portion (outdoor contact portion) 41 that comes into surface contact with the surface of the end portion 11a of the outdoor-side steel plate 11.

[0034] 2 and 3, the first joint member 4 in this embodiment has a hat-shaped cross section. Therefore, the first joint member 4 is composed of a pair of contact portions 41 and a covering portion 42 that is connected to the inner ends in the width direction of the pair of contact portions 41 (ends on the vertical joint 21 side) and is formed in a U-shape.

[0035] In the installed state, the covering portion 42 is composed of a convex portion that protrudes further toward the indoor side than the pair of abutting portions 41, and is housed within the vertical joint 21. Therefore, when the first joint member 4 is viewed from the outdoor side, a concave portion is formed by the covering portion 42. The covering portion 42 is composed of a pair of side portions 42a that are in surface contact with or close to the end face of the sandwich panel 1 (typically, the bent piece 11b of the outdoor-side steel plate 11), and a tip portion 42b that is perpendicular to (intersects) the end face.

[0036] By configuring the first joint member 4 as described above, the L-shaped plate portion consisting of the abutment portion 41 and side portion 42a of the first joint member 4 can be snugly fitted over (overlapped) the end portion 11a (including the bent piece 11b) of the outdoor steel plate 11 bent into an L shape of the sandwich panel 1.

[0037] The protruding length L1 (recess depth as viewed from the outdoor side) of the covering portion 42 shown in FIG. 3 is preferably less than 50% of the thickness dimension D1 (FIG. 2) of the sandwich panel 1. Furthermore, the protruding length L1 of the covering portion 42 is preferably equal to or greater than the depth L4 (FIG. 2) of the horizontal joint 22 of the sandwich panel 1. This prevents rainwater and heat from entering the insulation space 7 (described below) located on the indoor side of the covering portion 42 through the horizontal joint 22. The depth L4 of the horizontal joint 22 is, for example, approximately 20% to 30% of the thickness dimension D1 of the sandwich panel.

[0038] (Second joint member) The second joint member 5 is disposed on the indoor side of the vertical joint 21. The second joint member 5 integrally includes a covering portion (indoor covering portion) 52 that covers the vertical joint 21 and a contact portion (indoor contact portion) 51 that comes into surface contact with the surface of the end portion 12a of the indoor-side steel plate 12.

[0039] 2 and 3, the second joint member 5 in this embodiment also has a hat-shaped cross section. Therefore, the second joint member 5 is composed of a pair of contact portions 51 and a covering portion 52 that is connected to the inner ends in the width direction (ends on the vertical joint 21 side) of the pair of contact portions 51 and is formed in a U-shape.

[0040] In the installed state, the covering portion 52 is composed of a convex portion that protrudes toward the exterior side beyond the pair of abutting portions 51 and is housed within the vertical joint 21. Therefore, when the second joint member 5 is viewed from the indoor side, a concave portion is formed by the covering portion 52. The covering portion 52 is composed of a pair of side portions 52a that are in surface contact with or close to the end surface of the sandwich panel 1 (the bent piece 11b of the exterior-side steel plate 11 or the side end surface 13a of the core material 13), and a tip portion 52b that is perpendicular to (intersects) the end surface. From the perspective of preventing thermal bridges, it is desirable that the covering portion 52 not come into contact with the bent piece 11b of the exterior-side steel plate 11.

[0041] The protruding length L2 (recess depth as viewed from the indoor side) of the covering portion 52 shown in Figure 3 is desirably longer than the protruding length L1 of the covering portion 42 of the first joint member 4. Therefore, the protruding length L2 of the covering portion 52 may be 50% or more of the thickness dimension D1 (Figure 2) of the sandwich panel 1. Note that, as a modified example not shown, the protruding length L1 of the covering portion 42 of the first joint member 4 and the protruding length L2 of the covering portion 52 of the second joint member 5 may be equal to each other.

[0042] (insulated space) It is desirable to provide a heat insulating space 7 between the covering portion 42 of the first joint member 4 and the covering portion 52 of the second joint member 5. In this embodiment, the tip portion 42b of the first joint member 4 and the tip portion 52b of the second joint member 5 are spaced apart from each other, and the gap (space) between them forms the heat insulating space 7. The heat insulating space 7 is part of the internal space of the vertical joint 21.

[0043] The sum of the protruding length L1 of the covering portion 42 and the protruding length L2 of the covering portion 52 is shorter than the thickness dimension D1 of the sandwich panel 1 by the depth length L3 of the insulation space 7. As an example, the depth length L3 of the insulation space 7 shown in Figure 3 is set in the range of 5% to 30% of the thickness dimension D1 (Figure 2) of the sandwich panel 1.

[0044] In this embodiment, the protruding length L2 of the covering portion 52 is greater than the protruding length L1 of the covering portion 42, and therefore, as shown in FIG. 2, the insulating space 7 is located closer to the outdoors in the thickness direction of the sandwich panel 1.

[0045] (fasteners) The fastener 6 is formed, for example, by a tapping screw. As shown in Fig. 3, the fastener 6 is installed from the exterior side and screwed into the tip portion 42b of the first joint member 4 and the tip portion 52b of the second joint member 5. The fastener 6 fastens the tip portions 42b, 52b together while the abutting portion 41 of the first joint member 4 and the abutting portion 51 of the second joint member 5 clamp the end of the sandwich panel 1 in the thickness direction.

[0046] (Reinforcement installation method) A method for installing the reinforcing member 3 in the vertical joint 21 will be briefly described with reference to Fig. 3. In Fig. 3, the furring strips 14 are shown by imaginary lines.

[0047] When constructing the exterior wall of a building, before assembling the sandwich panel 1, the second joint member 5 is temporarily fastened to the furring strip 14. Specifically, the backsides of the pair of contact portions 51, 51 of the second joint member 5 are temporarily adhered to the mounting surface 14a of the furring strip 14 with double-sided tape or the like. The temporary fastening of the second joint member 5 may be performed in a factory. Furthermore, without being limited to temporary fastening, the second joint member 5 may also be permanently adhered to the mounting surface 14a by welding or the like.

[0048] In this embodiment, the vertical joint 21 can be sealed from the exterior side by the second joint member 5. This allows the second joint member 5 to function as a water-stopping material, similar to the water-stopping material 132 shown in the known fire-resistant structure. In other words, the second joint member 5 is a mounting fixture for attaching the first joint member 4 to the vertical joint 21, and also serves as a water-stopping material.

[0049] When assembling the sandwich panel 1, the second joint member 5 is temporarily fastened to the furring strip 14, so the sandwich panel 1 is positioned by butting the end surface against the side surface 52a of the second joint member 5, and the upper end is fixed to the mounting surface 14a with the fastener 15 (see Figures 1 and 2). Note that, as exaggeratedly shown in Figure 2 etc., there may be a small gap between the end surface of the sandwich panel 1 and the side surface 52a of the second joint member 5.

[0050] The contact portion 51 of the second joint member 5 is sandwiched (without any gap) between the back surface of the sandwich panel 1 (the end portion 12a of the indoor-side steel plate 12) and the mounting surface 14a of the furring strip 14. The fixing device 15 shown in Figure 2, together with the upper end portion of the sandwich panel 1, permanently fixes the contact portion 51 of the second joint member 5 to the furring strip 14.

[0051] When the sandwich panel 1 is assembled, the covering portion 52 of the second joint member 5 is inserted into the vertical joint 21 between two adjacent sandwich panels 1. In this state, the covering portion 42 of the first joint member 4 is inserted into the vertical joint 21, and the abutting portion 41 is brought into close contact with the end 11a of the exterior steel plate 11 of the sandwich panel 1. Because the width of the covering portion 42 of the first joint member 4 is set to approximately match the joint width of the vertical joint 21 (the same applies to the covering portion 52 of the second joint member 5), the side portion 42a of the covering portion 42 and the bent piece 11b of the exterior steel plate 11 are in contact (or close proximity). This stabilizes the posture of the long first joint member 4, which is long in the vertical direction.

[0052] With the covering portion 51 of the first joint member 4 inserted into the vertical joint 21, the fastener 6 is installed from the exterior side. The fastener 6 is screwed into the tip portion 42b of the first joint member 4 and then the tip portion 52b of the second joint member 5, in that order. As a result, the first joint member 4 and the second joint member 5 are connected to each other by the tightening force of the fastener 6, and the distance between them is maintained constant (the distance is prevented from expanding). The fasteners 6 are installed at multiple locations in the vertical direction, as shown in FIG. 1.

[0053] The sum of the protruding length L1 of the covering portion 42 and the protruding length L2 of the covering portion 52 is shorter than the thickness dimension D1 of the sandwich panel 1, so when the fasteners 6 are tightened, the abutting portions 41 of the first joint member 4 and the abutting portions 51 of the second joint member 5 clamp the ends of the sandwich panel 1 in the thickness direction. In other words, the abutting portions 41 of the first joint member 4 are pressed against both end portions 11a of the exterior steel plate 11 of the sandwich panel 1.

[0054] As shown in Figure 2, when viewed from the outdoor side, the head 6a of the fastener 6 is housed in the recess of the covering portion 42 of the first joint member 4. Therefore, the first joint member 4 and the second joint member 5 can be connected without the head 6a getting in the way.

[0055] It is desirable to fill the recesses of the covering portion 42 with a wet or dry sealant (not shown). This can prevent or suppress the intrusion of rainwater through the through-holes of the fastener 6. Furthermore, by making the surface of the sealant flush with the surface of the abutting portion 41 of the first joint member 4, the design of the entire exterior wall of the building can be improved.

[0056] In this embodiment, both the first joint member 4 and the second joint member 5 are hat-shaped, and both covering portions 42, 52 are inserted into the vertical joint 21, so that even in a thick sandwich panel 1 with a thickness dimension D1 of about 100 mm, the fasteners 6 can properly connect the two metal fittings 4, 5. In other words, the first joint member 4 can be properly attached to the outdoor side of the vertical joint 21 without being directly fixed to the sandwich panel 1 or the furring strip 14.

[0057] <Effects of reinforcement tools> The fire resistance of the building exterior wall (sandwich panel 1) in which the above-described reinforcing tool 3 is applied to the vertical joint 21 will be described.

[0058] As shown in FIG. 2, a pair of abutment portions 41 of the first joint member 4 are in surface contact with the ends 11a of the exterior-side steel plate 11 located on both sides of the vertical joint 21. In addition, the fasteners 6 maintain a constant distance between the first joint member 4 and the second joint member 5 (preventing them from separating from each other). This prevents the end 11a of the exterior-side steel plate 11 from lifting due to thermal deformation, even when heated from the exterior side. This reduces heat input to the gap between the end 11a of the exterior-side steel plate 11 and the core material 13, preventing flames from breaking out on the back side (indoor side) of the sandwich panel 1, as shown in FIG. 9(B).

[0059] Furthermore, since an insulating space 7 is provided between the covering portion 42 of the first joint member 4 and the covering portion 52 of the second joint member 5 located within the vertical joint 21, heat transfer from the first joint member 4 to the second joint member 5 can be suppressed. In other words, the first joint member 4 and the second joint member 5 do not form a thermal bridge. Furthermore, since the insulating space 7 is positioned closer to the exterior in the thickness direction of the sandwich panel 1, heat transfer can be suppressed in the early stages of heating.

[0060] <Other examples of reinforcement configurations> FIG. 4 is a diagram schematically showing a joint fireproof structure according to a modified example of the present embodiment, and is a cross-sectional view showing a state in which a reinforcing element 3A is attached to a vertical joint 21.

[0061] Reinforcing device 3A shown in Fig. 4 includes the configuration of reinforcing device 3 described above, as well as a thermally expandable fire-resistant material 8. Thermally expandable fire-resistant material 8 is a tape- or sheet-like product that expands several times when heated to a high temperature of, for example, 200°C or higher.

[0062] The thermally expandable fire-resistant material 8 is attached to the entire surface (outdoor surface) of the second joint member 5. Therefore, a portion 8a of the thermally expandable fire-resistant material 8 provided at the tip 52b of the second joint member 5 is exposed to the insulating space 7 in the vertical joint 21. In a normal state (unheated state), the portion 8a of the thermally expandable fire-resistant material 8 is separated from the tip 42b of the first joint member 4.

[0063] According to this modification, even if the first joint member 4 becomes hot due to heat generated outdoors, the thermally expandable fire-resistant material 8 (8a) located in the insulation space 7 will foam early, allowing the entire insulation space 7 to be filled with the fire-resistant material 8. As a result, an insulation layer made of the thermally expandable fire-resistant material 8 is formed between the covering portion 42 (tip portion 42b) of the first joint member 4 and the covering portion (tip portion 52b) of the second joint member 5, thereby further improving heat resistance compared to the above embodiment.

[0064] Furthermore, in this modified example, since the thermally expandable fire-resistant material 8 is also in contact with the end surface of the sandwich panel 1, even if the side end surface 13a of the core material 13 exposed to the vertical joint 21 begins to burn over time, the missing parts of the core material 13 can be filled with the expanded fire-resistant material 8 (see Figure 5), which is expected to have a combustion-retarding effect on the core material 13.

[0065] Furthermore, since the thermally expandable fire-resistant material 8 has a portion 8b that is sandwiched between the abutment portion 51 of the second joint member 5 and the indoor steel plate 12 of the sandwich panel 1, it is possible to effectively prevent flames from breaking out through the tiny gap between the indoor steel plate 12 of the sandwich panel 1 and the abutment portion 51 of the second joint member 5.

[0066] Although it is desirable that the thermally expandable fire-resistant material 8 be provided on the entire surface of the second joint member 5 as shown in Fig. 4, it is sufficient that it has at least a portion 8a facing the insulating space 7. That is, as in the reinforcing member 3B shown in Fig. 6(A), the thermally expandable fire-resistant material 8 may be attached only to the tip portion 52b of the covering portion 52 of the second joint member 5.

[0067] In this way, it is sufficient that the thermally expandable fire-resistant material 8 is disposed at least in the thermally insulated space 7. Therefore, as in the reinforcing member 3C shown in FIG. 6(B), the thermally expandable fire-resistant material 8 may be attached to the covering portion 42 side of the first joint member 4 facing the thermally insulated space 7.

[0068] <Other> Although an example has been shown in which the first joint member 4 and the second joint member 5 of the above-mentioned reinforcing device 3 (3A to 3C) are both formed from hat-shaped plate material, either the first joint member 4 or the second joint member 5 may be formed from a flat plate material.

[0069] In addition, in this embodiment, the outdoor steel plate 11 of the sandwich panel 1 has a bent piece 11b at the end 11a, but the above-mentioned reinforcing element 3 (3A to 3C) can also be applied to sandwich panels that do not have the bent piece 11b.

[0070] Furthermore, in this embodiment, a fire-resistant structure in which a sandwich panel is used as an exterior wall panel has been described, but even in the case of exterior wall panels other than sandwich panels, the reinforcement 3 can prevent flames from spreading to the back side (indoor side). Therefore, the reinforcement 3 can be suitably applied to exterior wall panels that use, for example, ceramic siding as an exterior facing material.

[0071] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0072] 1 Exterior wall panel (sandwich panel), 3, 3A, 3B, 3C Reinforcement, 4 First joint member, 5 Second joint member, 6 Fastener, 7 Insulation space, 8 Thermal expansion fireproof material, 11 Outdoor steel plate, 12 Indoor steel plate, 13 Core material, 14 Furring strip, 21 Vertical joint, 22 Horizontal joint, 41 Outdoor abutment part, 42 Indoor covering part, 51 Indoor abutment part, 52 Indoor covering part.

Claims

1. A fire-resistant structure at the joints of exterior wall panels, a first joint member that is disposed on the outdoor side of the joint portion and integrally includes an outdoor covering portion that covers the joint portion and an outdoor abutment portion that contacts the outdoor surface of the exterior wall panel; a second joint member that is disposed on the indoor side of the joint portion and integrally includes an indoor covering portion that covers the joint portion and an indoor abutment portion that contacts the indoor surface of the exterior wall panel; A fire-resistant structure for joints of exterior wall panels, comprising a fastener that connects the outdoor covering portion and the indoor covering portion that face each other at the joint.

2. The first joint member has a hat-shaped cross section, 2. The fire-resistant structure for joints of an exterior wall panel according to claim 1, wherein the exterior covering portion is configured by a protrusion that protrudes toward the interior side beyond the pair of exterior abutment portions.

3. The second joint member has a hat-shaped cross section, 3. The fire-resistant structure of a joint portion of an exterior wall panel according to claim 1, wherein the indoor covering portion is configured by a convex portion that protrudes toward the outdoor side beyond the pair of indoor abutment portions.

4. 2. The fire-resistant joint structure of an exterior wall panel according to claim 1, wherein a heat insulating space is provided between the exterior covering portion of the first joint member and the interior covering portion of the second joint member.

5. The fire-resistant structure of the joint portion of the exterior wall panel described in claim 4, further comprising a thermally expandable fire-resistant material arranged in the insulation space and attached to the outdoor covering portion of the first joint member or the indoor covering portion of the second joint member.

6. 6. The fire-resistant structure for joints of an exterior wall panel according to claim 4, wherein the heat-insulating space is located closer to the exterior in a thickness direction of the exterior wall panel.

7. The indoor abutment portion of the second joint member is fixed to a furring strip, The fireproof joint structure of an exterior wall panel according to claim 1 , wherein the second joint member also serves as a water-stopping material.

8. The exterior wall panel is a sandwich panel covered with steel plates on both the outdoor and indoor sides, 2. A fire-resistant structure for a joint portion of an exterior wall panel according to claim 1, wherein the outdoor abutment portion of the first joint member contacts the end surface of the outdoor steel plate of the sandwich panel, and the indoor abutment portion of the second joint member contacts the end surface of the indoor steel plate of the sandwich panel.

9. A reinforcing tool applied to the joint of an exterior wall panel, a first joint member that is disposed on the outdoor side of the joint portion in an attached state and integrally includes an outdoor covering portion that covers the joint portion and an outdoor abutment portion that contacts the outdoor surface of the exterior wall panel; a second joint member that is disposed on the indoor side of the joint portion in an attached state and integrally includes an indoor covering portion that covers the joint portion and an indoor abutment portion that contacts the indoor surface of the exterior wall panel; A reinforcement comprising a fastener that connects the outdoor covering portion and the indoor covering portion that face each other at the joint portion.

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