Reinforcing structure for exterior wall panel

Abstract

To provide a reinforcing structure of vertically fitted sandwich panels (external wall panels).SOLUTION: A reinforcing structure for an exterior wall panel (1) which includes an outdoor-side steel plate (11) and a core member (13) and which is mounted by being fitted in a vertical direction, the reinforcing structure including a fastening member (3) which is inserted from an outdoor side in a side edge portion (18) of the exterior wall panel along a vertical joint (21) between the exterior wall panels and which fastens the outdoor-side steel plate to furring strips (14), and a cover member (4) which covers the fastening member from the outdoor side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforcing structure for exterior wall panels, and more particularly to a reinforcing structure for exterior wall panels that are fitted together in the vertical direction. [Background technology]

[0002] Exterior wall panels (hereinafter also referred to as "sandwich panels"), which are covered with steel plates on both the indoor and outdoor sides, are sometimes laid horizontally to form the exterior walls of buildings.

[0003] As a reinforcing structure for sandwich panels, for example, Japanese Patent Laid-Open Publication No. 6-146435 (Patent Document 1) discloses a vertical joint structure comprising a decorative cover and a locking body, each of which has an inverted hat-shaped cross section, and a joiner, also of which has a hat-shaped cross section. It describes how covering the vertical joint with two components, the locking body and the decorative cover, improves waterproofing, and how interposing a fire-resistant insulating material between the locking body and the joiner improves fire resistance, etc., of the vertical joint.

[0004] Furthermore, Japanese Patent Laid-Open Publication No. 3-13660 (Patent Document 2) discloses a technique in which multiple battens are fixed to a building frame with their longitudinal directions horizontal, and then a sandwich panel is fitted between the rising portions of the battens spaced apart in the vertical direction, and the four corners of the panel are fixed with fasteners. It is stated that the inclusion of the battens improves fire resistance, etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-146435 [Patent Document 2] Japanese Patent Application Publication No. 3-13660 Summary of the Invention [Problem to be solved by the invention]

[0006] One type of sandwich panel is one that fits together vertically. Specifically, a protrusion is formed on the upper end surface of the lower panel, and a groove that accepts the protrusion is formed on the lower end surface of the upper panel. In this case, the upper corners of the lower panel are fixed to the furring strip with screws, and then the grooves of the upper panel are fitted onto the protrusions of the lower panel to form a row of sandwich panels.

[0007] Because sandwich panels have a steel plate covering the exterior surface, when heated from the exterior, the steel plate thermally deforms, causing the edges to warp (lift up). In the above-mentioned type of panel, only the top edge of the exterior steel plate is fixed with screws, so the exterior steel plate can warp significantly at the side edges of the panel along the vertical joints. As a result, the core material inside the panel burns early, resulting in insufficient fire resistance.

[0008] The sandwich panel structure of Patent Document 1 does not disclose fixing the panel to the furring strip from the exterior side with screws or the like, and would be insufficient to prevent warping of the exterior steel plate due to heating.

[0009] The sandwich panel structure of Patent Document 2 has a rising portion of the batten interposed between the upper and lower panels, and therefore cannot be applied to sandwich panels of the type that fit together vertically.

[0010] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a reinforcing structure for sandwich panels that are fitted together vertically. [Means for solving the problem]

[0011] The reinforcing structure for exterior wall panels of the present invention has an exterior steel plate and a core material, and is attached by fitting in the vertical direction, and is equipped with fastening members that are inserted from the exterior side at the side edge portions of the exterior wall panels along the vertical joints between the exterior wall panels to fasten the exterior steel plate to the furring strips, and a cover member that covers the fastening members from the exterior side.

[0012] Preferably, a plurality of fastening members are provided along the vertical direction.

[0013] Preferably, the cover member has a recess that is recessed toward the outdoor side (protrudes toward the indoor side) and is inserted into the vertical joint, and the recess is filled with a sealant.

[0014] Preferably, the reinforcing structure of the exterior wall panel has a hat-shaped cross-sectional shape and further includes a cover receiving member whose protrusion protruding to the outside is inserted into a vertical joint, and the tip of the protrusion and the recess of the cover member are joined at the vertical joint.

[0015] Preferably, the reinforcing structure of the exterior wall panel further includes a cover fastening member arranged in the vertical joint and fixed to the side end face of the exterior wall panel, and the cover fastening member and the recess of the cover member are joined at the vertical joint.

[0016] Preferably, as another form of the cover fastening member, the reinforcing structure of the exterior wall panel further comprises a cover fastening member that abuts against the exterior steel plate, is fixed by a fastening member, and has a recess that is inserted into the vertical joint, and the recess of the cover fastening member and the recess of the cover member are joined.

[0017] Preferably, a closing member is provided to seal the gap between the side edge of the cover member and the exterior-side steel plate.

[0018] Preferably, the cover member extends to cover the fastening members of the upper exterior wall panel and the fastening members of the lower exterior wall panel. [Effects of the Invention]

[0019] According to the present invention, the exterior steel plate of an exterior wall panel (sandwich panel) that is fitted and installed in the vertical direction is fastened to the furring strips with fastening members, which makes it possible to suppress warping of the exterior steel plate due to heating. In addition, because the fastening members are covered with cover members, it is possible to prevent deterioration of the design and waterproofing properties, and also to prevent direct heating within the vertical joints. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a front view showing a schematic view of an exterior wall panel according to each embodiment of the present invention, viewed from the outdoor side. [Figure 2] FIG. 10 is a vertical cross-sectional view schematically showing the state in which the exterior wall panel is fixed to the furring strip. [Figure 3] 1 is a horizontal cross-sectional view schematically showing a reinforcement structure according to a first embodiment of the present invention. [Figure 4] 10(A) and 10(B) are horizontal cross-sectional views each showing a schematic diagram of a procedure for attaching the reinforcement structure according to the first embodiment. [Figure 5] FIG. 10 is a horizontal cross-sectional view schematically showing a reinforcement structure according to a second embodiment of the present invention. [Figure 6] 10(A) and 10(B) are horizontal cross-sectional views each showing a schematic diagram of a procedure for attaching the reinforcement structure according to the second embodiment. [Figure 7] FIG. 10 is a horizontal cross-sectional view schematically showing a reinforcement structure according to a third embodiment of the present invention. [Figure 8] 10A to 10C are horizontal cross-sectional views schematically showing the procedure for attaching the reinforcement structure according to the third embodiment. [Figure 9] FIG. 1 is a front view schematically showing a known building exterior wall to which sandwich panels are applied. [Figure 10] 1(A) and 1(B) are horizontal cross-sectional views each showing a schematic view of the exterior wall of the known building. [Figure 11] FIG. 2 is a schematic diagram for explaining the fire resistance of the exterior wall of the known building. DETAILED DESCRIPTION OF THE INVENTION

[0021] 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.

[0022] <About sandwich panels> In the embodiment of the present invention, a known sandwich panel (hereinafter referred to as "panel") is used as an exterior wall panel. First, the arrangement and basic configuration of this panel will be described with reference to Figs. 9 and 10. In Fig. 9, 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, in Fig. 10, arrow A3 indicates the indoor side of the depth direction of the sandwich panel 1. This is also true for the other figures.

[0023] As shown in Figure 9, a building exterior wall 100 is constructed by aligning a plurality of panels 1 in the up-down direction (vertical direction) and the left-right direction (horizontal direction). Vertical joints 21 are formed between the left and right panels 1, and horizontal joints 22 are formed between the upper and lower panels 1. The panels 1 that are continuous in the up-down direction are connected by fitting a ridge formed on the upper end surface of the lower panel 1 with a groove formed on the lower end surface of the upper panel 1 that receives the ridge. This fitting will be described later.

[0024] Fig. 10(A) shows an enlarged cross section of the portion XA enclosed by the dashed line in Fig. 9, and Fig. 10(B) shows an enlarged cross section taken along line XB-XB in Fig. 9. As shown in these figures, panel 1 is an exterior wall panel covered on both the outdoor and indoor sides with steel plates 11 and 12, indicated by thick lines. Core material 13 of panel 1 is made of an organic heat insulating material such as polyisocyanurate foam, and is integrated with steel plates 11 and 12 (adhered to core material 13). The thickness of panel 1 is relatively large, expected to be, for example, about 100 mm.

[0025] 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 adhered 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.

[0026] Furring strips 14 are arranged on the indoor side of the panels 1, and the upper corners of each panel 1 are fixed to the furring strips 14 with fasteners 15 such as screws. Regarding the installed (fitted) state of the panels 1, referring to area A indicated by the dashed line in Figure 2, the fasteners 15 are concealed by downward protrusions 1b formed at the lower end of the upper panel 1. The downward protrusions 1b overlap inward and outward with recesses 1a formed at the upper end of the lower panel 1. As shown in Figure 9, the portions of the recesses 1a that are not covered by the downward protrusions 1b of the upper panel 1 (exposed portions) form horizontal joints 22.

[0027] On the other hand, consecutive panels 1 in the left-right direction do not overlap, and the gap between two adjacent panels 1 in the left-right direction forms a vertical joint 21. In an embodiment of the present invention, furring strips 14 are arranged at positions (joint centers) corresponding to the vertical joints 21. The furring strips 14 are typically square steel, and their exterior side surfaces 14a form the mounting surface. The above-mentioned fasteners 15 are inserted into the ends of the recessed portions 1a (upper ends) of the panels 1 and fixed to the exterior side surfaces 14a of the furring strips 14.

[0028] As shown in Figure 10, the vertical joints 21 between the panels 1 are filled with a sealing material 131 (including, for example, a heat insulating material similar to the core material 13, or a wet or dry sealing material). In addition, a sheet-like or thin-plate-like water-stop material (hereinafter referred to as "sheet-like water-stop material") 132 is provided on the back side (indoor side) of the panel 1. The sheet-like water-stop material 132 is attached to the entire outdoor side surface 14a of the furring strip 14.

[0029] As shown in FIG. 11(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. As shown in FIG. 11(B), the ends 11a of the outdoor steel plate 11 on both sides of the vertical joint 21 rise up and 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 the vertical joint 21 is filled with a sealing material 131, the heat from burning the core material 13 may reach the back side of the 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 panel 1 and the outdoor-side side surface 14a (sheet-like water-stop material 132) of the furring strip 14.

[0030] In contrast, the reinforcing structure of the exterior wall panel in the present invention can suppress the lifting (thermal deformation) of the end 11a of the outdoor steel plate 11 when heated by reinforcing and fixing (fastening) the outdoor steel plate 11 to the furring strip at the side edge of the panel 1 along the vertical joint 21 with fastening members.

[0031] <Outline of reinforcement structure> The configuration of the building exterior wall 10 shown in Fig. 1, which is common to all the embodiments, will be described. Similar to the arrangement and basic configuration of the panels 1 shown in Fig. 9, the building exterior wall 10 is configured by arranging a plurality of panels 1 (exterior wall panels 1) in an aligned manner in the up-down direction (vertical direction) and the left-right direction (horizontal direction) as shown in Fig. 1.

[0032] As shown in FIG. 2, vertically continuous panels 1 are connected by fitting a ridge 16a formed on the upper end surface 16 of the lower panel 1 with a groove 17a formed on the lower end surface 17 of the upper panel 1 that receives the ridge. After the lower panel 1 is installed in a predetermined position, it is fixed to the furring strip 14 by a fastener 15 that penetrates the upper end of the exterior steel plate 11. The head of the fastener 15 is concealed by a downward protrusion 1b formed on the lower end of the upper panel 1. Note that in FIG. 2, to make it easier to see how the panels 1 are fitted together, the steel plates 11 and 12 of only the lower panel 1 are shown in bold. The upper end surface of the core material 13 (or the waterproof film attached to the upper end surface) is exposed between the two ridges 16a of the panel 1, and the lower end surface of the core material 13 (or the waterproof film attached to the lower end surface) is exposed between the two grooves 17a of the panel 1.

[0033] As shown in FIG. 1, in addition to fixing devices 15, fastening members 3 (typically screws or tapping screws) are provided at side edge portions 18 of panel 1 along vertical joints 21. Also, a cover member 4 is provided to cover the fastening members 3 and vertical joints 21 from the exterior side. In order to show the vertical joints 21, the cover member 4 is partially omitted from the illustration. As shown in FIG. 2, the fastening members 3 fasten the exterior-side steel plate 11 to the furring strips 14. Note that the cover member 4 is omitted from FIG. 2.

[0034] As shown in Figure 1, a plurality of fastening members 3 are provided in the vertical direction. If the dimensions of one panel 1 are, for example, a height (vertical) L1 of 1000 mm and a width (horizontal) L2 of approximately 3000 to 6000 mm, the pitch L3 between the upper and lower fastening members 3 is set to, for example, a range of 200 to 300 mm. Furring strips 14 (Figure 2) are provided on the indoor side of the panel 1 along the vertical joints 21. The furring strips 14 are provided spaced apart on the left and right, and the pitch between the furring strips is, for example, approximately 1000 to 2000 mm.

[0035] The cover member 4 extends so as to cover the fastening members 3 of the upper panel 1 and the fastening members 3 of the lower panel 1. That is, the cover member 4 extends vertically across the horizontal joints 22. For example, one long cover member 4 may be provided for three or four panels arranged vertically. Covering the horizontal joints 22 with the cover member 4 is expected to further suppress warping of the exterior-side steel plate 11.

[0036] Note that Figure 1 only shows the fastening members 3 and fixtures 15 provided on the side edge 18 along the vertical joint 21 between the left and right panels 1, and does not show the fastening members 3 and fixtures 15 along the opposite side edge.

[0037] <First Embodiment> (Overall structure) The reinforcement structure according to this embodiment will be described with reference to Figures 3 and 4. Panel 1 has an exterior-side steel plate 11, an interior-side steel plate 12, and a core material 13, and is attached by fitting them together in the vertical direction (Figure 2). Fastening members 3 are inserted from the exterior side into side edge portions 18 of panel 1 along vertical joints 21 between the left and right panels 1, 1, and fasten the exterior-side steel plate 11 to furring strips 14. Fastening members 3 are covered from the exterior side by cover members 4. Cover members 4 are joined to cover receiving members 5 within the vertical joints 21.

[0038] (About the cover material) The cover member 4 has a hat-shaped cross section as shown in FIG. 3 and other figures. Therefore, a generally U-shaped recess 41 recessed toward the outdoor side (protruding toward the indoor side) and a pair of left and right side edge covering portions 42 connected to the outdoor end of the recess 41 are integrally formed. The recess 41 is inserted into the vertical joint 21. That is, the recess 41 has a bottom 41a and a pair of side portions 41b. The bottom 41a is positioned to close the vertical joint 21, and the side portions 41b are positioned to be in surface contact with and / or adjacent to the bent piece 11b of the outdoor-side steel plate 11 and the side end surface 13a of the core material 13. The recess 41 is filled with a wet or dry sealing material 131. The sealing material 131 is covered by a fire-resistant sealant 91 from the outdoor side.

[0039] The side edge covering portion 42 covers the fastening member 3 from the exterior side, and a folded portion 42a is formed at the free end (the end not connected to the recess 41). In Figure 3 and other figures, the space α in which the head of the fastening member 3 is housed is shown exaggerated. A closing material 92 may be provided to seal the gap between the side edge portion (folded portion 42a) of the cover member 4 and the exterior-side steel plate 11. The closing material 92 is typically a standard water-stopping material such as a packing, but may also be used in combination with a wet sealant as needed to form the closing material 92. Note that the free end is bent as the folded portion 42a, which provides great strength.

[0040] (About the cover support part) The cover receiving member 5 has a hat-shaped cross section. Therefore, a generally inverted U-shaped protrusion 51 protruding toward the outdoor side and a pair of left and right indoor contact portions 52 connected to the indoor-side end of the protrusion 51 are integrally formed. The indoor contact portions 52 are in surface contact with the indoor-side steel plate 12, and a fastening member 3 passes through them. The protrusion 51 is inserted into the vertical joint 21. That is, the protrusion 51 has a tip portion 51a and a pair of side portions 51b, and the tip portion 51a is arranged to close the vertical joint 21, and the side portions 51b are in surface contact with or adjacent to the side end surface 13a of the core material 13. At the vertical joint 21, the tip portion 51a of the protrusion 51 and the recess 41 (bottom portion 41a) of the cover member 4 are joined (fastened) by a fastener 81. The length of the cover receiving member 5 in the up-down direction (direction along the vertical joint) is not particularly limited, and it may extend over the entire length of the panel 1 or may be provided intermittently.

[0041] (Procedure for installing the reinforcement structure) First, as shown in Figure 4 (A), with a sheet-shaped waterproof material 132 sandwiched between the outdoor side surface 14a of the furring strip 14 and the cover receiving member 5, the cover receiving member 5 is fixed to the furring strip 14 with fasteners 82.

[0042] Next, as shown in Figure 4(B), the panel 1 is fixed to the furring strip 14 by the fasteners 15 at a position where the side portion 51b of the cover receiving member 5 and the side end face 13a of the core material 13 of the panel 1 are in surface contact or close to each other. The fasteners 15 penetrate the outdoor steel plate 11 (recessed portion 1a (Figure 2)), core material 13, indoor steel plate 12, cover receiving member 5 (indoor contact portion 52), sheet-like water-stopping material 132, and the outdoor side surface 14a of the furring strip 14.

[0043] Thereafter, below the fixing device 15 (at the back of the page), the fastening member 3 penetrates from the exterior side through the panel 1, cover receiving member 5, sheet-like water-stopping material 132, and the exterior-side surface 14a of the furring strip 14, reinforcing and fixing the panel 1 to the furring strip 14. In this way, the exterior-side steel plate 11 is fastened to the furring strip 14. Note that in Figure 4(B), the fixing device 15 and the fastening member 3 are shown with their installation positions shifted to the left and right to make them easier to see, but as shown in Figure 1, the fixing device 15 and the fastening member 3 may also be aligned in a straight line.

[0044] After reinforcing and fixing with the fastening members 3, the cover member 4 is attached from the outdoor side. Specifically, the recess 41 is placed within the vertical joint 21, and the bottom 41a of the recess 41 and the tip 51a of the cover receiving portion 51 abut against each other, and the side 41b of the recess 41 is in surface contact and / or close to the bent piece 11b of the outdoor-side steel plate 11 and the side end face 13a of the core material 13. Then, the recess 41 and the tip 51a are fastened together with the fastener 81. In this way, as shown in FIG. 1 , the cover member 4 covers the fastening members 3 and the vertical joint 21 from the outdoor side. Note that the bottom 41a and the tip 51a may be positioned close to each other without abutting against each other.

[0045] 3, a sealing member 131 and a fire-resistant sealant 91 are provided in the recess 41, and a closing member 92 is provided in the gap between the folded portion 42a and the exterior steel plate 11. According to this embodiment, the exterior steel plate 11 is fastened to the furring strips 14 by the fastening members 3, which makes it possible to suppress warping of the exterior steel plate 11 when heated.

[0046] <Embodiment 2> (Overall structure) The reinforcement structure according to this embodiment will be described with reference to Figures 5 and 6. Panel 1 has an exterior-side steel plate 11, an interior-side steel plate 12, and a core material 13, which are fitted together in the vertical direction (Figure 2). Fastening members 3 are inserted from the exterior side into side edge portions 18 of panel 1 along vertical joints 21 between the left and right panels 1, 1, and fasten the exterior-side steel plate 11 to furring strips 14. Fastening members 3 are covered from the exterior side by cover members 4. Cover members 4 are joined to and positioned within vertical joints 21 with base materials 6 (cover fastening members).

[0047] (About the cover fastening material) In this embodiment, a pair of substantially L-shaped base members 6 constitute the cover fastening member. The base members 6 are arranged within the vertical joints 21 (at a position midway in the thickness direction of the panel 1) and fixed to the side end faces of the panel 1. Specifically, the base member 6 is integrally formed with a surface contact portion 61 inserted between the side end face 13a of the core member 13 and the bent piece 11b of the exterior-side steel plate 11, and a support portion 62 extending from the indoor-side end of the surface contact portion 61 toward the vertical joints 21. The length dimension of the base members 6 in the up-down direction (the direction along the vertical joints 21) is not particularly limited, and they may extend over the entire length of the panel 1 or may be provided intermittently.

[0048] The left and right base materials 6, 6 are arranged so that the support portions 62 overlap. At the vertical joint 21, the recess 41 (bottom 41a) of the cover member 4 overlaps the outdoor-side support portion 62 of the overlapping support portions 62. The bottom 41a is joined to both support portions 62 by fasteners 81A. A sealing member 131A is provided between the indoor-side support portion 62 and the sheet-like water-stopping material 132. Note that other configurations (cover members, etc.) of this embodiment are the same as those of embodiment 1, and therefore description thereof will not be repeated.

[0049] (Procedure for installing the reinforcement structure) As shown in Figure 6(A), the surface contact portion 61 of the base material 6 is inserted between the bent piece 11b of the exterior-side steel plate 11 and the side end surface 13a of the core material 13, and the surface contact portion 61 and the bent piece 11b are fastened together with fasteners 82A. Although not shown, the base material 6 on the left side of the paper in Figure 5 is also attached to the panel 1 in a similar manner. Note that in this embodiment, the surface contact portion 61 is inserted between the bent piece 11b and the side end surface 13a, but the surface contact portion 61 may also be attached to the surface of the bent piece 11b on the vertical joint 21 side.

[0050] With the left and right panels 1 placed on the furring strips 14 (water-stop sheet 132) so that the support portions 62, 62 of the left and right base materials 6 overlap each other in the depth direction, the panels 1 are fixed to the furring strips 14 from the outdoor side using fasteners 15. The fasteners 15 penetrate the outdoor steel plate 11 (recessed portion 1a (Figure 2)), core material 13, indoor steel plate 12, water-stop sheet 132, and outdoor side surface 14a of the furring strip 14.

[0051] Thereafter, below the fixing device 15 (toward the back of the page), the fastening member 3 penetrates the panel 1, the sheet-like water-stopping material 132, and the furring strip 14 (outdoor-side surface 14a) from the outdoor side, reinforcing and fixing the panel 1 to the furring strip 14. In other words, the fastening member 3 fastens the outdoor-side steel plate 11 to the furring strip 14. As in the first embodiment, the fixing device 15 and the fastening member 3 are shown shifted in their left and right positions.

[0052] After reinforcing and fixing with the fastening members 3, the cover member 4 is attached from the outdoor side. Specifically, the recess 41 is placed inside the vertical joint 21, and the bottom 41a of the recess 41 is positioned so that it abuts against the outdoor-side support portion 62 of the base material 6. Then, the recess 41 and the overlapping support portions 62 are fastened together with fasteners 81A. In this way, as shown in FIG. 1, the cover member 4 covers the fastening members 3 and the vertical joint 21 from the outdoor side.

[0053] As shown in Figure 5, a sealing member 131 and a fireproof sealing material 91 are provided in the recess 41, and a closing material 92 is provided in the gap between the folded portion 42a and the exterior steel plate 11. In addition, another sealing member 131A is provided between the support portion 62 of the base material 6 and the sheet-like water-stopping material 132. According to this embodiment, the cover fastening member (base material 6) that supports the cover member 4 can be formed in advance before being placed on the furring strip 14 of the panel 1, improving workability.

[0054] <Third Embodiment> (Overall structure) 7 and 8, a reinforcement structure according to this embodiment will be described. Panel 1 has an exterior-side steel plate 11, an interior-side steel plate 12, and a core material 13, which are fitted together in the vertical direction (FIG. 2). In this embodiment, a cover base 7 (cover fastening member) is provided between the exterior-side steel plate 11 and cover member 4. Cover member 4 is joined to and positioned within vertical joint 21 with cover base 7. Fastening members 3 are inserted from the exterior side through cover base 7 and side edge portions 18 of panel 1 along vertical joint 21 between left and right panels 1, 1, to reinforce and fix panel 1 to furring strips 14. In other words, the exterior-side steel plate 11 is fastened to the furring strips 14. Fastening members 3 and cover base 7 are covered from the exterior side by cover member 4.

[0055] (About the cover fastening material) In this embodiment, the cover base 7 constituting the cover fastening member has a hat-shaped cross section. Therefore, a substantially U-shaped base recess 71 recessed toward the outdoor side (protruding toward the indoor side) and a pair of left and right fixing portions 72 connected to the outdoor-side end of the base recess 71 are integrally formed. The fixing portions 72 are in surface contact with the outdoor-side steel plate 11 and are fixed to the outdoor-side steel plate 11 by fastening members 3. The base recess 71 has a base bottom portion 71a and a pair of base side portions 71b. The base bottom portion 71a is positioned to close the vertical joint 21, and the base side portions 71b are positioned to be in surface contact with and / or adjacent to the bent piece 11b of the outdoor-side steel plate 11 and the side end surface 13a of the core material 13.

[0056] The base recess 71 of the cover base 7 is inserted into the vertical joint 21, and the recess 41 of the cover member 4 is attached so as to fit into this base recess 71. That is, the base bottom 71a of the base recess 71 and the bottom 41a of the cover member 4 (recess 41) are in surface contact, and the base side 71b of the cover base 7 and the side 41b of the cover member 4 (recess 41) are in surface contact. The base bottom 71a of the base recess 71 and the bottom 41a of the recess 41 are joined (fastened) together by fasteners 81B.

[0057] The fixing portion 72 of the cover substrate 7 and the side edge covering portion 42 of the cover member 4 are spaced apart, forming a space α1 (shown exaggerated) for receiving the head of the fastening member 3. The length dimension of the cover substrate 7 in the vertical direction (the direction along the vertical joint 21) is not particularly limited, and may extend over the entire length of the panel 1, or may be provided intermittently. In other words, the cover substrate 7 may be a piece that is attached with a pair of fastening members 3, or may be long enough to be attached in the vertical direction with multiple pairs of fastening members 3. Note that other configurations of this embodiment (cover member, etc.) are the same as those of embodiment 1, and therefore description thereof will not be repeated.

[0058] (Procedure for installing the reinforcement structure) As shown on the bottom of Figure 8, the left and right panels 1 are placed on the furring strips 14 (water-stop sheet 132) with a gap that will form the vertical joint 21, and the panels 1 are fixed to the furring strips 14 from the outdoor side using fasteners 15. The fasteners 15 penetrate the outdoor steel plate 11 (recessed portion 1a (Figure 2)), core material 13, indoor steel plate 12, water-stop sheet 132, and outdoor side surface 14a of the furring strips 14.

[0059] Then, as shown in the upper part of FIG. 8 , the base recess 71 of the cover base 7 is fitted into the vertical joint 21, and the fastening portion 72 is in surface contact with the exterior-side steel plate 11. The cover base 7 is then attached to the panel 1 from the exterior side using fastening members 3. The fastening members 3 penetrate the fastening portions 72, the panel 1, the sheet-like water-stop material 132, and the furring strips 14 (exterior-side surfaces 14a) to reinforce and fix the panel 1 to the furring strips 14. The cover member 4 is then attached from the exterior side so that the recess 41 of the cover member 4 fits into the base recess 71 of the cover base 7, and the bottom 41a of the recess 41 and the base bottom 71a of the base recess 71 are fastened together with fasteners 81B ( FIG. 7 ). In this embodiment, the reinforcing and fixing using the fastening members 3 and the attachment of the cover base 7 are performed simultaneously, improving workability. Note that, as in the first embodiment, the left and right positions of the fastening members 15 and the fastening members 3 are shifted.

[0060] Although not shown, the cover member 4 is attached from the outdoor side so that the base recess 71 overlaps the recess 41 of the cover member 4. The base bottom portion 71a of the base recess 71 and the bottom portion 41a of the cover member 4 are fastened together with fasteners 81B.

[0061] 7, a sealing member 131 and a fireproof sealing material 91 are provided in the recess 41, and a closing material 92 is provided in the gap between the folded portion 42a and the exterior-side steel plate 11. In addition, another sealing member 131B is provided between the base bottom portion 71a and the sheet-like water-stopping material 132.

[0062] According to each embodiment, the exterior-side steel plate 11 is reinforced and fixed (fastened) by the fastening members 3 in addition to the fixing devices 15, thereby suppressing warping of the exterior-side steel plate 11. Furthermore, the provision of the cover members 4 makes it possible to further suppress warping.

[0063] In addition, because the cover member 4 covers the fastening members 3 from the exterior side, the heads of the fastening members 3 are not exposed, and the design is not impaired. Furthermore, the cover member 4 helps to prevent a decrease in waterproofing and to prevent flames from penetrating the vertical joints 21.

[0064] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope.

[0065] For example, the cover receiving member 5 of the first embodiment may be combined with the cover base 7 of the third embodiment, and the cover member 4, the cover base 7, and the cover receiving member 5 may be fastened together with fasteners at the vertical joint 21. In this case, it is expected that warping of the exterior steel plate 11 can be further suppressed.

[0066] Furthermore, in each embodiment, three fastening members 3 are provided below fixture 15, but the number of fastening members may be at least one. [Explanation of symbols]

[0067] 1 exterior wall panel (sandwich panel, panel), 11 outdoor side steel plate, 12 indoor side steel plate, 14 furring strip, 15 fixing device, 18 side edge portion, 21 vertical joint, 22 horizontal joint, 3 fastening member, 4 cover member, 41 recess, 42 side edge covering portion, 5 cover receiving member, 51 convex portion, 52 indoor abutment portion, 6 base material (cover fastening member), 61 surface contact portion, 62 support portion, 7 cover base (cover fastening member), 71 base recess, 72 fixing portion, 81 fastener, 91 fireproof sealant, 92 closing material, 100 building exterior wall, 131 sealing member, 132 sheet-shaped water stop material

Claims

1. A reinforcement structure for an exterior wall panel that has an outdoor steel plate and a core material and is fitted and attached in the vertical direction, a fastening member that is inserted from the exterior side at the side edge portion of the exterior wall panel along the vertical joint between the exterior wall panels and fastens the exterior side steel plate to the furring strip; A reinforcing structure for an exterior wall panel comprising: a cover member that covers the fastening member from the outdoor side.

2. The reinforcing structure for an exterior wall panel according to claim 1 , wherein a plurality of the fastening members are provided along the vertical direction.

3. The cover member has a recess that is recessed toward the outdoor side and is inserted into the vertical joint, The reinforced structure of an exterior wall panel according to claim 1 , wherein the recess is filled with a sealant.

4. Further provided is a cover receiving member having a hat-shaped cross section and a protrusion protruding to the outdoor side that is inserted into the vertical joint, The reinforcement structure for an exterior wall panel according to claim 3 , wherein a tip end of the protrusion and a recess of the cover member are joined at the vertical joint.

5. Further provided is a cover fastening member disposed in the vertical joint and fixed to the side end surface of the exterior wall panel, The reinforcing structure for an exterior wall panel according to claim 3 , wherein the cover fastening member and the recess of the cover member are joined at the vertical joint.

6. a cover fastening member that abuts against the exterior steel plate, is fixed by the fastening member, and has a recess that is inserted into the vertical joint; The reinforcing structure for an exterior wall panel according to claim 3 , wherein the recess of the cover fastening member and the recess of the cover member are joined together.

7. The reinforcement structure for an exterior wall panel according to any one of claims 3 to 6, further comprising a closing material for sealing a gap between the side edge of the cover member and the exterior steel plate.

8. 3. The reinforcing structure for exterior wall panels according to claim 2, wherein the cover member extends so as to cover the fastening members of the upper exterior wall panel and the fastening members of the lower exterior wall panel.

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