Fireproof structure of building exterior wall and fireproof reinforcing tool

Abstract

To improve the fire resistance of a building external wall using a sandwich panel.SOLUTION: The fire-resistant structure includes a connecting member (3) that connects lower end portions (11e, 12c) of an outdoor side steel sheet (11) and an indoor side steel sheet (12) to each other, the outdoor side steel sheet (11) and the indoor side steel sheet (12) being disposed at a fitting portion of the outer wall panel (1) and spaced apart from each other in an inward-outward direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant structure and fire-resistant reinforcement for building exterior walls, and in particular to a fire-resistant structure and fire-resistant reinforcement for joints between exterior wall panels (so-called sandwich panels) whose exterior and interior sides are covered with steel plates, and [Background technology]

[0002] Metal sandwich exterior wall panels are often used in steel-frame buildings such as logistics facilities. These exterior wall panels are covered on both sides with an exterior steel plate and an interior steel plate. A fire-resistant joint structure for this type of exterior wall panel (hereinafter referred to as "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] Japanese Patent Application Laid-Open No. 2016-94790 Summary of the Invention [Problem to be solved by the invention]

[0005] Typically, the exterior and interior steel plates of a sandwich panel are not connected to each other, but are independently bonded to the core material. Furthermore, the sandwich panels are only attached to the upper edges of the furring strips, and are attached by fitting multiple sandwich panels together vertically. Therefore, when heated from the exterior side, the exterior steel plate undergoes thermal deformation, causing the side and bottom edges of the exterior steel plate to lift up from the core material. When the exterior steel plate lifts up (opens), the vertical and horizontal joints widen, which tends to accelerate the combustion of the core material. Therefore, even if non-combustible sealants are filled into the joints (vertical and horizontal 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 structure that can improve the fire resistance performance of building exterior walls using sandwich panels. [Means for solving the problem]

[0007] A fire-resistant structure for a building exterior wall according to one aspect of the present invention is a fire-resistant structure for a building exterior wall in which a plurality of exterior wall panels, each having a core material covered with an exterior steel plate and an interior steel plate, are attached by fitting them together in the vertical direction, and the structure is provided with connecting members that are arranged at the fitting points of the exterior wall panels and connect the lower ends of the exterior steel plate and the interior steel plate that are spaced apart from each other in the inward and outward directions.

[0008] Preferably, the connecting member has a substantially U-shaped cross section and is fixed to both the exterior-side steel plate and the folded-back portion of the interior-side steel plate exposed at the lower end surface of the exterior wall panel.

[0009] Preferably, the fire-resistant structure of the building exterior wall includes a horizontal joint member that is disposed in a horizontal joint space formed by the overlapping portion of the upper exterior wall panel and the lower exterior wall panel, and is fixed to the upper end of the lower exterior wall panel.

[0010] It is desirable that the horizontal joint member extend along the width direction of the exterior wall panel, and that a fastening member for fixing the upper end of the lower exterior wall panel to the furring strip penetrate the horizontal joint member.

[0011] The horizontal joint member has a main body portion that contacts the exterior steel plate and an upper flange that protrudes from the upper end of the main body portion toward the exterior side, and it is also desirable that a thermally expandable fire-resistant material be attached to the upper flange.

[0012] The fire-resistant structure of the building exterior wall further includes a vertical joint member fixed to the side edge of the exterior steel plate and fastened to the furring strip. Preferably, the vertical joint member is made of at least a pair of angle members.

[0013] A fire-resistant reinforcement according to another aspect of the present invention is a fire-resistant reinforcement applied to the joints of exterior wall panels having a core material covered with an outdoor steel plate and an indoor steel plate, and is equipped with a connecting member that is placed at the fitting point of the exterior wall panels and connects the lower ends of the outdoor steel plate and the indoor steel plate that are spaced apart in the inward and outward directions. [Effects of the Invention]

[0014] According to the present invention, the opening of the exterior steel plate during heating is suppressed, thereby improving the fire resistance of the building exterior wall using the sandwich panel. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram showing a schematic view of a horizontal joint structure of a building exterior wall according to an embodiment of the present invention. FIG. [Figure 2] 1 is a cross-sectional view schematically showing a mounting structure of a connecting member according to an embodiment of the present invention. [Figure 3] FIG. 2 is a perspective view showing a connecting member according to the embodiment of the present invention. [Figure 4] 1 is a cross-sectional view schematically showing a mounting structure of a horizontal joint member in an embodiment of the present invention. [Figure 5] FIG. 2 is a perspective view showing a horizontal joint member according to an embodiment of the present invention. [Figure 6] FIG. 1 is a schematic diagram for explaining the fire resistance of a joint structure (horizontal joint) according to an embodiment of the present invention. [Figure 7]1 is a diagram showing a schematic view of a vertical joint structure of a building exterior wall according to an embodiment of the present invention. FIG. [Figure 8] 1 is an exploded cross-sectional view showing an example of the configuration of a vertical joint member in an embodiment of the present invention. FIG. [Figure 9] FIG. 2 is a schematic front view of the structure of the exterior wall of the building. [Figure 10] FIG. 1 is a diagram showing a schematic diagram of the basic structure of a vertical joint in a building exterior wall. [Figure 11] FIG. 1 is a diagram showing a schematic diagram of the basic structure of a horizontal joint in a building exterior wall. [Figure 12] FIG. 1 is a schematic diagram illustrating the fire resistance of a known joint structure (vertical joint). [Figure 13] FIG. 1 is a schematic diagram illustrating the fire resistance of a known joint structure (horizontal joint). DETAILED DESCRIPTION OF THE INVENTION

[0016] 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.

[0017] <About sandwich panels> First, the basic structure of the sandwich panel 1 will be briefly described with reference to Figures 9 to 11. Figure 9 is a schematic front view of the structure of a building exterior wall. Figure 10 is a diagram showing the basic structure of a vertical joint 21 of the building exterior wall, and is an enlarged cross-section of the area X enclosed by a dashed line in Figure 9. Figure 11 is a diagram showing the basic structure of a horizontal joint 22 of the building exterior wall, and is an enlarged cross-section of the area XI enclosed by a dashed line in Figure 9. In these figures, the vertical direction of the sandwich panel 1 is indicated by arrow A1, and the width direction (left-right direction) of the sandwich panel 1 is indicated by arrow A2. Furthermore, arrow A3 in Figure 10 indicates the indoor side.

[0018] As shown in Figure 9, a building exterior wall is constructed by arranging multiple sandwich panels 1 in an up-down (vertical) and left-right (horizontal) alignment. Vertical joints 21 are formed between the left and right sandwich panels 1, and horizontal joints 22 are formed between the upper and lower sandwich panels 1.

[0019] As shown in Figure 10, 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 Figure 2, etc.). Core material 13 of sandwich panel 1 is made of an organic heat insulating material such as polyisocyanurate foam, and is integrated with outdoor-side steel plate 11 and indoor-side steel plate 12. Outdoor-side steel plate 11 and indoor-side steel plate 12 are bonded to core material 13. The thickness of sandwich panel 1 is relatively large, for example, about 100 mm.

[0020] The side end 11a of the outdoor steel plate 11 adjacent to the vertical joint 21 is bent into an L shape, and the bent piece 11b abuts or is close to (or in some cases is bonded to) a part of the side end surface 13a of the core material 13. On the other hand, the side end of the indoor steel plate 12 is not bent, and the remaining part of the side end surface 13a of the core material 13 is exposed.

[0021] As shown in Figure 11, sandwich panels 1, which are continuous in the vertical direction, are assembled by fitting upper end portions 10a and lower end portions 10b together. Generally, the upper end portion 10a of the sandwich panel 1 is formed with a protrusion 15a that protrudes upward, and the lower end portion 10b is formed with a groove 15b that receives the protrusion 15a. Two protrusions 15a and two grooves 15b are provided.

[0022] The convex shape of the outdoor-side protrusion 15a is formed by the folded portion 11d of the upper end portion 11c of the outdoor-side steel plate 11, and the convex shape of the indoor-side protrusion 15a is formed by the folded portion 12b of the upper end portion 12a of the indoor-side steel plate 12. The upper end surface 13c of the core material 13 (or a waterproof film attached to the upper end surface 13c of the core material 13) is exposed between the two protrusions 15a. The concave shape of the outdoor-side groove 15b is formed by the folded portion 11f of the lower end portion 11e of the outdoor-side steel plate 11, and the concave shape of the indoor-side groove 15b is formed by the folded portion 12d of the lower end portion 12c of the indoor-side steel plate 12. The lower end surface 13b of the core material 13 (or a waterproof film attached to the lower end surface 13b of the core material 13) is exposed between the two grooves 15b.

[0023] In the installed state, the upper end 10a of the sandwich panel 1 is fixed to the furring strip 14 with fastening members 16 such as screws. The furring strip 14 is typically made of square steel, and its exterior-facing side forms the mounting surface 14a. In the installed state of the sandwich panel 1, the head 16h of the fastening member 16 (hereinafter referred to as the "screw head") is housed in the horizontal joint space S and is concealed by a downward protrusion 1c formed in the lower end 10b of the upper sandwich panel 1. The downward protrusion 1c overlaps in the inward / outward direction with a recess 1a formed in the upper end 10a of the sandwich panel 1, and the horizontal joint space S in this embodiment is the space (gap) between the downward protrusion 1c and the recess 1a.

[0024] As shown in FIG. 10 , adjacent sandwich panels 1 do not overlap, and the gap between two adjacent sandwich panels 1 forms a vertical joint 21. A furring strip 14 is positioned at a location corresponding to the vertical joint 21 (the joint center). In known fire-resistant joint structures, a sealing material 131 (e.g., a similar insulating material to the core material 13 or a wet or dry sealing material) fills the vertical joint 21 between sandwich panels 1. Also, as shown in FIG. 10 , a sheet-like or thin-plate-like water-stopping material 132 may be 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 shown between the sealing material 131 and the side end surface 13a of the core material 13 in FIG. 10 .

[0025] As shown in FIG. 12(A), when the exterior wall of a building is heated from the outdoor side, the outdoor steel plate 11 warps over time due to thermal deformation, and as shown in FIG. 12(B), the side edge 11a of the outdoor steel plate 11 rises away from the core material 13. In this case, the gap between the raised side edge 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 sealing material 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 on the indoor side. 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.

[0026] 13, at the lower end 10b of the sandwich panel 1, the lower end 11e of the exterior steel plate 11 rises from the core material 13, expanding the horizontal joint space S. At the upper end 10a of the sandwich panel 1, the upper end 11c of the exterior steel plate 11 rises from the core material 13 in areas other than those fixed by the fastening members 16. This allows heat to enter through the horizontal joint space S, accelerating combustion of the core material 13 (as indicated by the dashed arrow).

[0027] In contrast, the fire-resistant structure of the building exterior wall in this embodiment is equipped with a "fire-resistant reinforcement" that improves the fire resistance of the joints by suppressing opening (lifting) of the exterior-side steel plate 11 at the joints (vertical joints 21 and horizontal joints 22). The fire-resistant reinforcement will be described in detail below.

[0028] <Configuration example of fire-resistant reinforcement for horizontal joints> An example of the configuration of a fire-resistant reinforcing tool for a horizontal joint 22 in this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram schematically showing the structure of a horizontal joint 22 in the exterior wall of a building, and corresponds to Fig. 11 described above.

[0029] As shown in Figure 1, the fire-resistant reinforcement includes a "connecting member 3" that is placed at the fitting point between the upper and lower sandwich panels 1, and a "horizontal joint member 4" that is placed in the horizontal joint space S formed by the overlapping portion between the upper sandwich panel 1 and the lower sandwich panel 1.

[0030] (About connecting parts) 2 and 3, a configuration example of the connecting member 3 will be described. Fig. 2 is a cross-sectional view that schematically shows the mounting structure of the connecting member 3. Fig. 3 is a perspective view that shows the connecting member 3.

[0031] The connecting member 3 is a member that connects the lower ends 11e, 12c of the outdoor-side steel plate 11 and the indoor-side steel plate 12, which are spaced apart in the inward-outward direction, and is typically made of a metal plate-like member with a substantially U-shaped cross section. Both ends of the connecting member 3 are fixed to both the outdoor-side and indoor-side folded-back portions 11f, 12d that are exposed on the lower end surface of the sandwich panel 1. This connects and fixes the lower ends 11e, 12c of the outdoor-side steel plate 11 and the indoor-side steel plate 12. The plate thickness of the connecting member 3 is, for example, about 0.5 to 1.5 mm.

[0032] From the viewpoint of workability, it is desirable that the connecting member 3 is a long member extending along the width direction (horizontal direction) of the sandwich panel 1, as shown in Fig. 3. From the viewpoint of preventing thermal bridges, the connecting member 3 may be divided into multiple pieces in the width direction. Specifically, the piece-shaped connecting members 3 may be arranged at intervals along the width direction.

[0033] In the installed state, the connecting member 3 includes a horizontal portion 311 extending inward and outward between the groove portions 15b, 15b formed in the lower end portion 10b of the sandwich panel 1, an outdoor rising portion 312 rising upward from the outdoor side edge of the horizontal portion 311 and inserted into the groove portion 15b, and an indoor rising portion 313 rising upward from the indoor side edge of the horizontal portion 311 and inserted into the groove portion 15b.

[0034] The outdoor rising portion 312 contacts or is close to the side surface of the groove portion 15b (the folded portion 11f of the outdoor-side steel plate 11), and the indoor rising portion 313 contacts or is close to the side surface of the groove portion 15b (the folded portion 12d of the indoor-side steel plate 12). In this embodiment, the outdoor rising portion 312 has a bent portion 314 at its upper end, and the bent portion 314 contacts or is close to the bottom surface of the groove portion 15b.

[0035] The connecting member 3 is fastened to the folded portions 11f, 12d of the outdoor-side steel plate 11 and the indoor-side steel plate 12 by fasteners 32, 33, respectively. The fasteners 32, 33 are typically screws (tapping screws). One of the fasteners, 32, fastens and fixes the outdoor rising portion 312 of the connecting member 3 to the folded portion 11f of the outdoor-side steel plate 11. In this embodiment, the fastener 32 passes through the bent portion 314 from below and is fastened to the bottom surface of the groove portion 15b.

[0036] The other fastener 33 fastens and fixes the indoor rising portion 313 of the connecting member 3 to the folded portion 12d of the indoor-side steel plate 12. In this embodiment, the fastener 33 passes through the indoor rising portion 313 from the indoor side and is fastened to the side surface of the groove portion 15b. As shown in FIG. 1 , the fastener 33 is desirably installed from the indoor side with the upper sandwich panel 1 and the lower sandwich panel 1 fitted together. In other words, the fastener 33 is passed from the indoor side through the downward protrusion 1c formed on the indoor side of the upper sandwich panel 1, the protrusion portion 15a of the lower sandwich panel 1, and the indoor rising portion 313 of the connecting member 3, in that order.

[0037] 3, pilot holes 310 for inserting fasteners 32 may be provided in advance in the bent portions 314 of the connecting member 3. The upper and lower sandwich panels 1 are assembled with the connecting member 3 attached to the lower end portions 10b of the sandwich panels 1 by the fasteners 32, and the fastening work of the fasteners 33 is carried out with the upper and lower sandwich panels 1 fitted together. In the attached state, the outdoor rising portion 312 and the indoor rising portion 313 of the connecting member 3 clamp the edge of the folded portion 11f of the outdoor-side steel plate 11 and the edge of the folded portion 12d of the indoor-side steel plate 12 in the inward and outward directions.

[0038] 1, when the upper and lower sandwich panels 1 are fitted together, the horizontal portions 311 of the connecting member 3 are sandwiched between the upper and lower end surfaces of the upper and lower sandwich panels 1. The heads (screw heads) of the fasteners 32 are housed in the gaps between the protrusions 15a of the lower sandwich panel 1 and the grooves 15b of the upper sandwich panel 1.

[0039] The arrangement pitch of the fasteners 32, 33 along the width direction of the sandwich panel 1 is desirably smaller than the arrangement pitch of the furring strips 14. The arrangement pitch of the fasteners 32, 33 can be set, for example, in the range of 1 / 2 to 1 / 10 of the arrangement pitch of the furring strips 14.

[0040] The connecting member 3 may have a shape other than a U-shape as long as it has a shape and size that correspond to the uneven shape of the lower end surface of the sandwich panel 1.

[0041] (Regarding horizontal joint components) An example of the configuration of the horizontal joint member 4 will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is a cross-sectional view that schematically shows the mounting structure of the horizontal joint member 4. Fig. 5 is a perspective view that shows the horizontal joint member 4.

[0042] The horizontal joint member 4 is fixed to the outdoor surface of the upper end portion 11c of the outdoor-side steel plate 11. The horizontal joint member 4 is typically made of a metal plate-like member having a substantially U-shaped cross section. As shown in FIG. 5, the horizontal joint member 4 is preferably an elongated member extending along the width direction (horizontal direction) of the sandwich panel 1. The plate thickness of the horizontal joint member 4 is, for example, about 0.5 to 1.5 mm.

[0043] The horizontal joint member 4 has a size that can be accommodated in the horizontal joint space S shown in Figure 1, and is fixed to the recessed portion 1a. The horizontal joint member 4 includes a vertical portion 411 that extends in the up-down direction, and flanges 412, 413 that protrude from the upper and lower edges of the vertical portion 411 to the outdoors.

[0044] The horizontal joint member 4 is fastened to the upper end portion 11c of the exterior steel plate 11 by a fastener 42 that penetrates the vertical portion 411. The fastener 42 is typically a screw. As shown in Fig. 5, the horizontal joint member 4 may be provided in advance with a pilot hole 410 for inserting the fastener 42.

[0045] The upper and lower sandwich panels 1 are assembled with the horizontal joint members 4 fixed in place by the fixing devices 42. Note that the fastening members 16 for fixing the upper end portions 10a of the sandwich panels 1 to the furring strips 14 penetrate the horizontal joint members 4. As a result, the horizontal joint members 4 are firmly fastened to the furring strips 14, and therefore also function as pressing members for pressing down the upper end portions 11c of the exterior-side steel plates 11 from the exterior side.

[0046] As shown in FIG. 1, when the upper and lower sandwich panels 1 are fitted together, the horizontal joint member 4 is housed in the horizontal joint space S. The lower flange 413 of the horizontal joint member 4 extends to the back surface of the covering portion 1b, and the horizontal joint space S is closed from below by the lower flange 413. It is desirable that the upper flange 412 also extends to the back surface of the covering portion 1b. In addition, as shown in FIG. 4, it is desirable that a thermally expandable fire-resistant material 43 be attached to the upper surface of the upper flange 412.

[0047] (Fire resistance of horizontal joints) The horizontal joints 22 of the building exterior wall are provided with the above-mentioned connecting members 3 and horizontal joint members 4. As shown in Fig. 6, when heating is applied from the outside, the horizontal joint members 4 can suppress heat input from the horizontal joint space S of the horizontal joint 22 to the fitting portion of the sandwich panel 1. Furthermore, even if the horizontal joint space S expands due to thermal deformation of the exterior-side steel plate 11 and heat penetrates into the horizontal joint space S, the thermally expandable fire-resistant material 43 will foam, thereby delaying the heat input to the fitting portion of the sandwich panel 1.

[0048] Furthermore, even if the outdoor-side steel plate 11 is deformed and lifts up from the core material 13, the lower end 11e (folded portion 11f) of the outdoor-side steel plate 11 and the lower end 12c (folded portion 12d) of the indoor-side steel plate 12 are restrained by the connecting member 3, so that the opening of the lower end 11e of the outdoor-side steel plate 11 can be suppressed. In addition, because the connecting member 3 covers the lower end surface of the core material 13, burning of the core material 13 at the lower end 10b of the sandwich panel 1 can be suppressed.

[0049] 4, if a metal tape 5 made of aluminum or the like is attached to the upper end surface of the sandwich panel 1, it is also possible to suppress combustion of the core material 13 at the upper end 10a of the sandwich panel 1. The metal tape 5 is attached across the upper end 11c (folded portion 11d) of the outdoor steel plate 11 and the upper end 12a (folded portion 12b) of the indoor steel plate 12.

[0050] <Configuration example of fire-resistant reinforcement for vertical joints> An example of the configuration of a fire-resistant reinforcing tool for a vertical joint 21 in this embodiment will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a diagram schematically showing the structure of a vertical joint 21 in an exterior wall of a building, and corresponds to Fig. 10 described above. Fig. 8 is an exploded cross-sectional view showing an example of the configuration of a vertical joint member 6.

[0051] As shown in Figures 7 and 8, the fire-resistant reinforcement includes a "vertical joint member 6" fixed to the side end 11a of the outdoor steel plate 11 and fastened to the furring strip 14, a "metal tape 7" that seals the gap between the vertical joint member 6 and the indoor steel plate 12, and a sheet-like "thermally expandable fire-resistant material 8" attached to the mounting surface 14a of the furring strip 14.

[0052] (Vertical joint components) As shown in Fig. 8, the vertical joint member 6 is composed of at least a pair of angle members 60 fixed to each of the left and right sandwich panels 1. The angle members 60 are metal plate members bent into a substantially L-shape. The thickness of the angle members 60 is also, for example, about 0.5 to 1.5 mm.

[0053] The angle member 60 includes a main body 61 extending inward and outward along the side end face of the sandwich panel 1, and a bent portion 62 formed by bending the indoor-side end of the main body 61 at approximately 90 degrees. The outdoor-side end of the main body 61 is overlapped with the bent piece 11b of the side end 11a of the outdoor-side steel plate 11, and this portion is fixed with a fastener 63 such as a screw. If the bent piece 11b of the outdoor-side steel plate 11 is not bonded to the core material 13, the outdoor-side end of the main body 61 may be inserted between the bent piece 11b and the core material 13 and fixed, as shown in the drawing.

[0054] The bent portions 62 are positioned flush with the indoor-side steel plate 12. In the installed state, the bent portions 62 of the left and right angle irons 60 are overlapped with each other. Fixing devices 64 such as screws are fixed to the furring strips 14 so as to pass through the overlapping portions of the bent portions 62. As a result, the side end portions 11a (bent pieces 11b) of the outdoor-side steel plate 11 are fastened to the furring strips 14 by the vertical joint members 6.

[0055] The angle iron 60 is a long member extending in the vertical direction, and typically extends from the upper end to the lower end of the sandwich panel 1. As a result, the exposed portion of the core material 13 is covered with the angle iron 60. Note that, from the viewpoint of preventing thermal bridges, the angle iron 60 may be divided in the vertical direction. Specifically, a plurality of piece-shaped angle irons 60 may be arranged at intervals in the vertical direction.

[0056] As shown in FIG. 7, in the attached state, it is desirable that the space between the left and right angle members 60 be filled with a sealing member 131 containing a wet or dry sealant.

[0057] (Regarding metal tape and thermal expansion fireproofing material) The metal tape 7 shown in Fig. 8 is an adhesive tape made of a metal material such as aluminum. The metal tape 7 is attached across the bent portion 62 of the angle iron 60 and the interior steel plate 12. The metal tape 7 is applied before the sandwich panel 1 is fixed to the furring strips 14.

[0058] The thermally expandable fire-resistant material 8 is attached to substantially the entire mounting surface 14a of the furring strip 14. In the mounted state, the thermally expandable fire-resistant material 8 contacts the metal tape 7.

[0059] (Fire resistance of vertical joints) The vertical joints 21 of the building exterior wall are provided with the above-mentioned vertical joint members 6, metal tape 7, and thermally expandable fire-resistant material 8. When heated from the outside, the vertical joint members 6 fasten the side end portions 11a (bent pieces 11b) of the exterior-side steel plates 11 to the furring strips 14, preventing the side end portions 11a from lifting up.

[0060] Furthermore, even if heat penetrates deep into the vertical joint 21, the metal tape 7 seals the gap between the vertical joint member 6 and the indoor steel plate 12, and the expanded thermally expandable fire-resistant material 8 fills the gap between the thermally deformed indoor steel plate 12 and the core material 13, thereby slowing down the progress of combustion of the internal core material 13.

[0061] As described above, the building exterior wall of this embodiment has the above-mentioned fire-resistant reinforcement provided in the joints, so that it is possible to achieve the desired fire resistance performance (or approach the desired fire resistance performance) even if the insulation performance of the core material 13 of the existing sandwich panel 1 is relatively low.

[0062] 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]

[0063] 1 sandwich panel, 3 connecting member, 4 horizontal joint member, 5,7 metal tape, 6 vertical joint member, 8,43 thermal expansion fireproof material, 11 exterior steel plate, 12 interior steel plate, 13 core material, 14 furring strip, 15a protrusion portion, 15b groove portion, 16 fastening member, 21 vertical joint, 22 horizontal joint, 60 angle member, S horizontal joint space.

Claims

1. A fire-resistant structure for a building exterior wall in which a plurality of exterior wall panels, each having a core material covered with an outdoor steel plate and an indoor steel plate, are fitted together in the vertical direction and attached, A fire-resistant structure for a building exterior wall, comprising a connecting member that is arranged at the fitting point of the exterior wall panels and connects the lower ends of the exterior steel plate and the indoor steel plate that are spaced apart in the inward and outward directions.

2. 2. A fire-resistant structure for a building exterior wall as described in claim 1, wherein the connecting member has an approximately U-shaped cross section and is fixed to both the outdoor steel plate exposed on the lower end surface of the exterior wall panel and the folded portion of the indoor steel plate.

3. 2. A fire-resistant structure for a building exterior wall according to claim 1, further comprising a horizontal joint member disposed in a horizontal joint space formed by an overlapping portion between an upper exterior wall panel and a lower exterior wall panel, and fixed to an upper end of the lower exterior wall panel.

4. The horizontal joint member extends along the width direction of the exterior wall panel, 4. A fire-resistant structure for a building exterior wall according to claim 3, wherein a fastening member for fixing the upper end of the lower exterior wall panel to a furring strip penetrates the horizontal joint member.

5. The horizontal joint member has a main body portion that contacts the exterior-side steel plate and an upper flange that protrudes from an upper end of the main body portion to the exterior side, 4. The fire-resistant structure for a building exterior wall according to claim 3, wherein a thermally expandable fire-resistant material is attached to the upper flange.

6. The fire-resistant structure for a building exterior wall according to claim 1, further comprising a vertical joint member fixed to a side end of the exterior steel plate and fastened to a furring strip.

7. 7. The fire-resistant structure for a building exterior wall according to claim 6, wherein the vertical joint member is formed of at least a pair of angle members.

8. A fire-resistant reinforcement applied to the joints of exterior wall panels whose core material is covered with an outdoor steel plate and an indoor steel plate, A fire-resistant reinforcement device comprising a connecting member that is arranged at the fitting point of the exterior wall panel and connects the lower ends of the outdoor steel plate and the indoor steel plate that are spaced apart from each other in the inward and outward directions.

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