Fire resistant structure of vertical joint portion, and fire resistant tool

Abstract

To provide a fire resistant structure of a vertical joint portion and a fire resistant tool suitable for a building using an exterior wall panel with a panel frame.SOLUTION: A fire resistant structure for a vertical joint portion 3 between exterior wall panels 1 having a panel frame 10 comprises a plate member 40 having fire resistant properties and covering a gap between neighboring panel frames 10, 10 in a left-right direction from an indoor side, and a fastening member 50 fastening the plate member 40 to the panel frame 10 by sandwiching, in the thickness direction, a flange 111 at an indoor side of a groove-shaped vertical frame 11 in the panel frame 10 and the plate member 40 abutting a surface of the flange.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant structure and a fire-resistant device for a vertical joint, and more particularly to a fire-resistant structure and a fire-resistant device for a vertical joint between exterior wall panels having a panel frame. [Background technology]

[0002] In the prefabricated construction method, exterior wall panels are manufactured in a factory by attaching exterior materials to a panel frame, and then multiple exterior wall panels are assembled at the construction site. The exterior wall of the building is formed by placing interior materials on the indoor side of the exterior wall panels arranged left and right. During the above assembly process, gaps (vertical joints) are created between the exterior wall panels. These gaps become a weak point in terms of fire resistance, allowing heat to enter in the event of a fire occurring indoors or outdoors, so measures must be taken to prevent this.

[0003] JP 2018-80578 A (Patent Document 1) discloses a technology in which a fire-resistant material or the like is interposed in the vertical joints between adjacent exterior wall panels on the left and right, a pressure member is placed across the vertical joints from the indoor side, and the pressure member is fixed to the exterior wall panel with a fixing device, with sealing tape interposed between the pressure member and the exterior wall panel (the steel plate on the indoor side). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2018-80578 Summary of the Invention [Problem to be solved by the invention]

[0005] The exterior wall panel of Patent Document 1 has a metal sandwich structure, and therefore it is difficult to apply the fire-resistant structure of Patent Document 1 to an exterior wall panel having a panel frame.

[0006] In buildings that use exterior wall panels with panel frames, there is a need for technology that can effectively prevent heat from entering the interior (or escaping to the exterior) through gaps between adjacent panel frames.

[0007] The present invention has been made to solve such problems, and its purpose is to provide a fire-resistant structure and fire-resistant equipment for vertical joints that are suitable for buildings that use exterior wall panels with panel frames. [Means for solving the problem]

[0008] The fire-resistant structure of the vertical joint portion in the present invention is a fire-resistant structure of the vertical joint portion between exterior wall panels having a panel frame, and comprises a plate member having fire resistance and covering the gap between adjacent panel frames in the left-right direction from the indoor side, and a fastening member that fastens the plate member to the panel frame by sandwiching the plate member and the indoor-side flange portion of the groove-shaped vertical frame in the panel frame in the thickness direction.

[0009] Preferably, the fastening member is formed in an approximately U-shape and has a first abutment portion that abuts against the surface of the plate member and a second abutment portion that abuts against the back surface of the flange portion, and the plate member is fastened to the panel frame by the elastic force of at least one of the first abutment portion and the second abutment portion.

[0010] Preferably, the device further comprises a support member attached to the channel-shaped horizontal frame and supporting the plate member from below.

[0011] Preferably, the support member includes a first hooking portion that hooks onto one lower horizontal frame of adjacent panel frames on the left and right, a second hooking portion that hooks onto the other lower horizontal frame of the adjacent panel frames, and a support portion that is connected to the first hooking portion and the second hooking portion and on which the underside of the plate member is placed.

[0012] Preferably, the device further includes a fastener for fastening the first contact portion and the plate member together.

[0013] Preferably, the pair of left and right fastening members are arranged facing each other so as to have an overlapping portion where the first contact portions of the fastening members overlap, and the fastener passes through the overlapping portion.

[0014] The fire-resistant device of the present invention is a fire-resistant device that is applied to vertical joints between exterior wall panels having panel frames, and includes a plate member that has fire-resistant properties and is used to cover the gap between adjacent panel frames in the left-right direction from the indoor side, and a fastening member that, when installed, fastens the plate member to the panel frame by sandwiching the plate member and the indoor-side flange of the groove-shaped vertical frame in the panel frame in the thickness direction. [Effects of the Invention]

[0015] According to the present invention, it is possible to improve the fire resistance performance of vertical joints between exterior wall panels having panel frames. [Brief explanation of the drawings]

[0016] [Figure 1] (A) is a diagram showing a schematic view of the exterior wall of a building, and (B) is an enlarged view of the area surrounded by line B in FIG. 1(A). [Figure 2] 1 is a rear view schematically showing an exterior wall panel to which fastening members and support members according to the first embodiment are attached. FIG. [Figure 3] 2. (A) is a cross-sectional view taken along line IIIA-IIIA in FIG. 2, and (B) is an enlarged view of the area surrounded by line IIIB in FIG. [Figure 4] 1A is a plan view of the fastening member of the first embodiment, and FIG. 1B is a perspective view of the fastening member. [Figure 5] 1A is a front view of the support member, FIG. 1B is a perspective view of the support member, and FIG. 1C is a perspective view showing the attached state of the support member. [Figure 6] 10A to 10C are cross-sectional views schematically illustrating a process of attaching a fastening member. [Figure 7] FIG. 10 is a rear view schematically showing an exterior wall panel to which a fastening member according to a second embodiment is attached. [Figure 8]7A is a cross-sectional view taken along line VIIIA-IIIA in FIG. 7, (B) is an enlarged view of the area surrounded by line VIIIB in FIG. 7, and (C) is a cross-sectional view schematically showing a modified example of the fastening method of the fastening member of embodiment 2. [Figure 9] 10A to 10C are cross-sectional views schematically illustrating a step of attaching the fastening member of the second embodiment. [Figure 10] 10A to 10C are cross-sectional views schematically illustrating a step of attaching the fastening member of the second embodiment. [Figure 11] FIG. 1 is a cross-sectional view schematically showing a known fireproof structure of a gap (vertical joint portion) between panel frames. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] <Outline of exterior wall structure> Fig. 1(A) is a cross-sectional view showing a schematic configuration of a known exterior wall 100. In Fig. 1 and other figures, the width direction (left-right direction) of the exterior wall 100 is indicated by arrow X, and the depth direction is indicated by arrow Y. The outdoor side across the exterior wall 100 is indicated by symbol S1, and the indoor side is indicated by symbol S2. In Fig. 2 and other figures, the height direction (up-down direction) of the exterior wall panel 1 is indicated by arrow Z.

[0019] The exterior wall 100 is, for example, an exterior wall of a building (such as a house) constructed by a prefabricated method, and divides an indoor space. The exterior wall 100 has an exterior wall panel 1 arranged on the outdoor side and an interior material 2 arranged on the indoor side.

[0020] As shown in Figure 1(B), the exterior wall panel 1 has exterior materials 18 attached to a groove-shaped panel frame 10 filled with insulation panels 14 via external insulation material 15 and furring strips 16. Sealant 19 is applied to the gaps between adjacent exterior materials 18, 18 in the left-right direction. Adjacent panel frames 10, 10 are spaced apart from each other in the left-right direction, leaving gaps 3 between them. Sealant 19 is applied to the gaps between adjacent exterior materials 18, 18 in the left-right direction. The gaps 3 between the panel frames and the gaps between the exterior materials are included in the vertical joints.

[0021] An interior material 2 is disposed at a position indoors away from the exterior wall panel 1. The interior material 2 is fixed to studs 22. An air layer S3 is formed between the exterior wall panel 1 and the interior material 2.

[0022] In the event of a fire indoors or outdoors, the gaps 3 (vertical joints) between adjacent panel frames become a path for heat to enter, making them a weak point in terms of fire resistance. To overcome this weakness, it is considered effective to block the path for heat to enter. Specifically, as shown in Figure 1(B), it is considered effective to place fire-resistant material in the area α where the air layer S3 and the gap 3 are connected, thereby blocking the gap 3.

[0023] <Publicly known fire-resistant structures> 11 shows a known fire-resistant structure in which a flexible fiber-based thermal insulation material 9 is placed in an area including the area α. As the fiber-based thermal insulation material 9, for example, glass wool or rock wool is used. The fiber-based heat insulating material 9 is sandwiched and disposed between the studs 22 on the indoor S2 side and the panel frames 10, 10. The fiber-based thermal insulation material 9 is fastened to the panel frame by attaching a member with claws (not shown) to the flange 111 on the indoor side S2 of each panel frame 10 and piercing the claws into the fiber-based thermal insulation material 9. Alternatively, it can be fastened to the surface (indoor side) of the flange 111 with double-sided tape.

[0024] Although flexible fiber-based insulation 9 can be easily attached to panel frames, it is prone to losing its shape during a fire and may not meet the required fire resistance. Therefore, it is desirable to use a hard board member, such as gypsum board, which has higher fire resistance and is less likely to lose its shape during a fire, as a fire-resistant material to seal the gaps (vertical joints) between panel frames. However, the above-mentioned attachment methods (nails or double-sided tape) cannot secure hard board members to panel frames.

[0025] Therefore, in this embodiment, a structure that allows a hard plate member to be fastened to a panel frame and that also allows for easy fastening will be described below.

[0026] <First Embodiment> The fire-resistant structure of a vertical joint according to the first embodiment of the present invention will be described with reference to FIGS. The exterior wall panel 1 in Fig. 3(A) is similar to the exterior wall panel 1 in Fig. 1(B), in that exterior material 18 is attached to a panel frame 10 via external insulation material 15 and furring strips 16. The panel frame 10 is rectangular, consisting of a pair of left and right vertical frames 11, 11 and a pair of top and bottom horizontal frames 12, 12 (Fig. 2), and an insulation panel 14 is filled into the rectangular compartment. 2 and 3 show only a portion (side portion) of the exterior wall panels 1, 1 adjacent in the left-right direction. Vertical beams 101 and horizontal beams 102 are attached to the panel frame 10. The vertical frame 11 is groove-shaped and has a flange 111 on the indoor S2 side and a flange 112 on the outdoor S1 side.

[0027] As shown in FIGS. 2 and 3, the fire-resistant structure of this embodiment includes a hard plate member 40 having fire resistance, a fastening member 50, and a support member 60.

[0028] (Regarding plate materials) The plate member 40 has higher fire resistance than fibrous insulation materials such as rock wool. The plate member 40 is hard. Typically, the plate member 40 is made of gypsum board or calcium silicate board. As shown in FIG. 3(A), the plate member 40 has a rectangular cross section and a thickness equivalent to that of the exterior material 18, for example, and covers the gap 3 between adjacent panel frames 10, 10 in the left-right direction from the indoor side S2. In other words, the plate member 40 is arranged so as to close the gap 3 formed between adjacent vertical frames 11, 11 in the left-right direction from the indoor side. The thickness (depth direction) of the plate member 40 is set within the range of 9 mm to 50 mm, for example.

[0029] As shown in Fig. 2, the plate members 40 extend vertically between a pair of upper and lower horizontal frames 12 along the gap 3. In this embodiment, a plurality of plate members 40 of a predetermined length are arranged continuously in the vertical direction. The vertical length of one plate member is, for example, about 900 mm, and the width length is, for example, about 100 mm. Each plate member 40 is in surface contact with the entire indoor surface of the adjacent vertical frames 11, 11.

[0030] (Regarding fastening parts) 4 has a first contact portion 51, a second contact portion 52, and a connecting portion 53 that connects the first contact portion 51 and the second contact portion 52. The fastening member 50 is a piece-like member, and is formed, for example, by bending a thin metal plate into a substantially U-shape (a substantially U-shape). The material of the fastening member 50 is preferably spring steel. In order to make the shape of the fastening member 50 easier to understand, the thickness of the fastening member 50 is exaggerated in Figure 3(A) and shown as being approximately the same thickness as the panel frame 10 (e.g., 2.3 mm), but in reality it is thinner than the panel frame 10, e.g., approximately 1 mm to 1.5 mm.

[0031] The connecting portion 53 extends linearly and is formed so that its length in the depth direction is slightly longer than the combined thickness of the flange portion 111 of the vertical frame 11 and the thickness of the plate member 40. The connecting portion 53 has a back surface 53b that abuts against the side surface 43 of the plate member 40 when fastened, and a front surface 53a on the opposite side. An opening 56 is formed on the opposite side of the connecting portion 53 (the right side of the drawing).

[0032] 4, the first contact portion 51 is connected to the connecting portion 53 at the base end 511 and extends linearly in the left-right direction. The first contact portion 51 has a front surface 51a that faces the indoor side when fastened, and a back surface 51b that faces the outdoor side when fastened. The second contact portion 52 is continuous with the connecting portion 53 at the base end portion 521. The second contact portion 52 has a back surface 52b that faces the indoor side when fastened, and a front surface 52a that faces the outdoor side when fastened. The first contact portion 51 is formed to be longer in the left-right direction than the second contact portion 52. In this embodiment, the length of the first contact portion 51 in the left-right direction is equal to or greater than one-third of the width (left-right direction) dimension of the plate member 40.

[0033] The back surface 51b of the first contact portion 51 and the back surface 52b of the second contact portion 52 face each other. In this embodiment, the second contact portion 52 is formed so as to approach the first contact portion 51. That is, the distance between the back surface 51b of the first contact portion 51 and the back surface 52b of the second contact portion 52 decreases with increasing distance from the connecting portion 53.

[0034] More specifically, in the unloaded state, the distance L1 between the second contact portion 52 and the first contact portion 51 is shorter than the length L2 in the depth direction of the connection portion 53. Due to this shape, the second contact portion 52 functions as a leaf spring, and therefore, when fastened as described below, the second contact portion 52 exerts an elastic force (restoring force) toward the indoor side. For convenience in attaching and detaching the fastening member 50, it is desirable to provide a folded piece at the tip 51e of the first contact portion 51 and the tip 52e of the second contact portion 52.

[0035] (About support members) 2 and 3(B), the support member 60 supports the plate member 40 from below. As shown in Fig. 5, the support member 60 is made of a single metal plate and has a first hooking portion 61 hooked to the lower horizontal frame 12 of one of the left and right adjacent panel frames 10, 10, a second hooking portion 62 hooked to the lower horizontal frame 12 of the other left and right adjacent panel frame, a mounting portion 63 connected to the first hooking portion 61 and the second hooking portion 62, and a reinforcing portion 64 connected to the mounting portion 63 in the depth direction and extending downward.

[0036] The first hooking portion 61 and the second hooking portion 62 are bent into an L-shape and have insertion portions 61a and 62a, respectively. The first hooking portion 61 and the second hooking portion 62 are connected in the left-right direction via a mounting portion 63. The mounting portion 63 has a horizontal upper surface (mounting surface). The mounting portion 63 has depth and is connected to a reinforcing portion 64 at a side edge 63a on the indoor side.

[0037] 5(C) shows a state in which the support member 60 is attached to horizontally adjacent horizontal frames 12, 12, and the plate member 40 is placed on the placement portion 63. The support member 60 is attached so that the horizontal frame 12 is sandwiched between the insertion portion 61a and the reinforcing portion 64. The indoor S2 side surface of the insertion portion 61a of the first hooking portion 61 abuts against the outdoor S1 side surface of one of the horizontal frames 12 adjacent to it on the left and right. Similarly, the indoor S2 side surface of the insertion portion 62a of the second hooking portion 62 abuts against the outdoor S1 side surface of the other horizontal frame 12 adjacent to it on the left and right.

[0038] The outdoor S1 side surface of the reinforcing portion 64 abuts against the indoor S2 side surfaces of the horizontal frames 12, 12 adjacent to each other on the left and right. The reinforcing portion 64 covers the gap 3 from the indoor S2 side, contributing to improved fire resistance. The first hooking portion 61 is bent forward at the upper edge of one of the horizontal frames 12, and similarly, the second hooking portion 62 is bent forward at the upper edge of the other horizontal frame 12. The lower surface 44 of the plate member 40, which is set up approximately vertically, is placed on a placement portion 63 that is connected to the first hooking portion 61 and the second hooking portion 62. This allows the weight of the plate member 40 to be supported.

[0039] The fastening member 50 and the support member 60 constitute a fixture for fixing the plate member 40 to adjacent panel frames (vertical frames) on the left and right.

[0040] <How to install fastening parts> As shown in Fig. 6, first, a plate member 40 that is long in the vertical direction is placed between the flanges 111, 111 on the indoor S2 side of adjacent vertical frames 11, 11 so as to close the communication portion between the gap 3 and the air layer S3 (see area α in Fig. 1(b)). The left-right tips of adjacent flanges 111 and the left-right width of the plate member 40 are the same. In other words, the tips of the flanges 111 and the side surface 43 of the plate member 40 are arranged flush with each other.

[0041] This arrangement causes the rear surface 42 of the plate member 40 to abut (come into surface contact with) the surface 11a of the flange portion 111 (vertical frame 11). (Step 1) Although not shown, prior to arranging the plate member 40, a support member 60 is attached between the adjacent lower horizontal frames 12, 12 on the left and right. When arranging the plate member 40 in step 1, the plate member 40 is placed on the placement portion 63 of the support member 60.

[0042] Next, the fastening member 50 is attached from the side of the plate member 40. The second contact portion 52 is inserted between the indoor flange portion 111 (vertical frame 11) and the heat-insulating panel 14. Then, while pressing the tip portion 52e of the second contact portion 52 against the back surface 11b of the flange portion 111, the opening 56 (FIG. 3(A)) of the fastening member 50 is widened, and the fastening member 50 is attached so that the plate member 40 and the flange portion 111 are sandwiched between the first contact portion 51 and the second contact portion 52. (Step 2)

[0043] The fastening member 50 is fastened to the plate member 40 and the vertical frame 11 so that the front surface 41 of the plate member 40 abuts against the back surface 51b of the first abutment portion 51, the back surface 11b of the flange portion 111 abuts against the back surface 52b of the second abutment portion 52, and the side surface 43 of the plate member 40 abuts against the back surface 53b of the connecting portion 53. (Step 3)

[0044] In this embodiment, since the fastening member 50 is attached with the opening 56 widened, the second contact portion 52 functions as a leaf spring, and an elastic force (restoring force) acts in a direction approaching the first contact portion 51. This restoring force causes the second contact portion 52 and the first contact portion 51 to clamp the plate member 40 and the vertical frame 11. The side surface 43 of the plate member 40 and the tip of the flange portion 111 are flush with each other and abut against the connecting portion 53, so that a sufficient clamping force is exerted. Although the second contact portion is shaped to exert a restoring force, the first contact portion may be shaped to exert a restoring force, or both the first contact portion and the second contact portion may be shaped to exert a restoring force.

[0045] According to this embodiment, the plate member 40 is held only by clamping with the fastening members 50 and by support with the support members 60, so there is no need to use fasteners such as screws, and the construction burden is reduced.

[0046] Although the fastening member 50 is shown in the figure as a representative example when attached from the left side of the page, when attached from the opposite side, the same steps are carried out symmetrically on both sides.

[0047] (Example of fastening parts placement) It is desirable that a plurality of fastening members 50 are attached to one plate member 40. In Fig. 2, two fastening members 50, 50 are arranged apart from each other in the height direction for one plate member 40, with one fastening member attached to each left and right side of the plate member 40. It is desirable to provide a fastening member 50 near the boundary 40a between plate members 40, 40 adjacent in the height direction. The number and arrangement of fastening members 50 can be selected as appropriate. For example, a plurality of fastening members may be provided in a staggered pattern on one plate member, or a pair of fastening members may be provided at the same height.

[0048] <Embodiment 2> Second Embodiment A fire-resistant structure for a vertical joint according to a second embodiment of the present invention will be described with reference to FIGS. The exterior wall panel 1 and the plate member 40 in this embodiment are similar to those in the first embodiment, and description thereof will not be repeated.

[0049] (Regarding fastening parts) As shown in FIG. 8(A), a pair of fastening members 50A are provided on the left and right sides, and one fastening member 50A (on the left side of the drawing) has a first abutment portion 51 and a second abutment portion 52. The back surface 51b of the first abutment portion 51 abuts against the front surface 41 of the plate member 40, and the back surface 52b of the second abutment portion 52 abuts against the back surface 11b of one of the vertical frames 11 (the flange portion 111). The first abutment portion 51 of this embodiment is formed longer in the left-right direction than the first abutment portion 51 of the first embodiment, and extends to a position beyond the gap 3. The first abutment portion 51 is at least half the width (left-right direction) of the plate member 40.

[0050] The other fastening member 50A (on the right side of the drawing) has the same shape as the first fastening member 50A and is provided bilaterally symmetrically. The other fastening member 50A has a first abutment portion 51 and a second abutment portion 52. The back surface 51b of the first abutment portion 51 abuts against the front surface (on the indoor S2 side) of the first abutment portion 51 of the first fastening member 50A, and the back surface 52b of the second abutment portion 52 abuts against the back surface 11b of the other vertical frame 11 (flange portion 111). The other fastening member 50A sandwiches the flange portion 111 of the other vertical frame 11, the plate member 40, and the first fastening member 50A in the thickness direction.

[0051] The pair of left and right fastening members 50A, 50A are arranged facing each other in the area indicated by the dashed line β so that the tip ends 51e, 51e of each first abutment portion 51, 51 overlap each other at an overlapping portion 54, and are fastened together by a fastener 7 described later. In order to make it easier to understand the relative positions of the respective members, a gap is illustrated between the rear surface 51b of the other first contact portion 51 and the front surface 41 of the plate member 40.

[0052] In order to overlap both tip portions 51e, 51e, it is preferable that the tip portions are not folded back as in the first embodiment but are made straight. Other configurations of the fastening member of this embodiment are similar to those of the fastening member of the first embodiment, and description thereof will not be repeated.

[0053] 7, it is desirable that the fastening member 50A be provided so as to cover the boundary 40a between the plate members 40, 40 that are successively arranged in the vertical direction, thereby reducing the number of parts.

[0054] 7 and 8(B), it is desirable that the connection portions 53, 53 of a pair of fastening members 50A attached to the lower end of the plate member 40 abut against the upper edges of a pair of horizontal frames 12, 12 so as to be able to support the weight of the plate member 40. This eliminates the need to prepare support members of different shapes, and allows the plate member 40 to be supported with one type of fastening member, thereby reducing the number of parts.

[0055] Furthermore, the first contact portion and / or the second contact portion do not have to have a shape that exerts an elastic force (restoring force). That is, the first contact portion and the second contact portion may have a shape that makes them parallel to each other.

[0056] (About fasteners) As shown in Fig. 8(A), the fastener 7 penetrates both first contact portions 51, 51 (tip portions 51e, 51e) at the overlapping portion 54 and further penetrates the plate member 40. The fastener 7 is, for example, a screw, and is screwed so that the tip portion 71 reaches the gap 3. Because the fastener 7 is installed only at the position of the gap 3, it is possible to avoid screwing into the flange portion 111 of the vertical frame 11, which is thicker than the first contact portion 51, thereby reducing the installation burden. The fastener 7 need not necessarily penetrate the plate member 40 as long as it can fasten both first contact portions 51, 51 and the plate member 40 together.

[0057] The fastening members 50A (a pair of left and right members or either one) and the fastener 7 constitute a fixture for fixing the plate member 40 to adjacent panel frames (vertical frames) on the left and right.

[0058] <How to install fastening parts> As shown in FIG. 9, first, a plate member 40 is placed between adjacent vertical frames 11, 11 (gap 3) so as to close the communication portion between the gap 3 and the air layer S3 (see area α in FIG. 1(b)). This placement brings the back surface 42 of the plate member 40 into contact with the surface 11a of each vertical frame 11. (Step 1)

[0059] Next, the fastening member 50A is attached from one side of the plate member 40. The second contact portion 52 is inserted between the indoor-side flange 111 (vertical frame 11) and the heat-insulating panel 14. While pressing the tip portion 52e of the second contact portion 52 against the back surface 11b of the indoor-side flange 111, the opening 56 (FIG. 3(A)) of the fastening member 50A is widened, and the fastening member 50A is attached so that the plate member 40 and flange 111 are sandwiched between the first contact portion 51 and the second contact portion 52. (Step 2)

[0060] The fastening member 50A is attached to the plate member 40 so that the surface 41 of the plate member 40 abuts against the back surface 51b of the first abutment portion 51, the back surface 11b of the flange portion 111 abuts against the back surface 52b of the second abutment portion 52, and the side surface 43 of the plate member 40 abuts against the back surface 53b of the connecting portion 53. (Step 3)

[0061] After the fastening member 50A (hereinafter referred to as the first fastening member) is attached in step 3, another fastening member 50A (hereinafter referred to as the second fastening member) is attached from the other side of the plate member 40. As in step 2, the second contact portion 52 is inserted between the indoor flange 111 (vertical frame 11) and the heat insulating panel 14. While pressing the tip 52e of the second contact portion 52 against the back surface 11b of the flange 111 of the vertical frame, the opening of the rear fastening member 50A is widened and attached (step 4).

[0062] The rear fastening member 50A is attached so that the tip end 51e of the front fastening member 50A and the tip end 51e of the rear fastening member 50A overlap at an overlapping portion 54. This attachment causes the front surface (indoor S2 side) of the first contact portion 51 of the front fastening member 50A to abut against the back surface 51b of the first contact portion 51 of the rear fastening member 50A, the back surface 52b of the second contact portion 52 of the rear fastening member 50A to abut against the back surface 11b of the flange portion 111, and the back surface 53b of the connecting portion 53 to abut against the side surface 43 of the plate member 40. In this way, the rear fastening member 50A clamps the flange portion 111, the plate member 40, and the first contact portion 51 of the front fastening member 50A. (Step 5)

[0063] At the overlapping portion, the first contact portion 51 of the first fastening member 50A, the first contact portion 51 of the second fastening member 50A, and the plate member 40 are fastened together by the fastener 7. The fastener 7 penetrates both first contact portions 51, 51 and the plate member 40, and its tip portion 71 reaches the gap 3. (Step 6) Although the process of attaching the fastening member 50A from the left side of the page first is illustrated, if the fastening member is to be attached from the opposite side first, the same process is carried out with the left and right sides reversed.

[0064] (Variation) As shown in Fig. 8(C), the fastening member 50A of this embodiment does not need to be two overlapping members, and may be attached to only one side of the plate member 40. A first contact portion 51 extending beyond the gap 3 in the left-right direction is fastened to the plate member 40 by a fastener 7. Also, like the fastening member 50 of Fig. 2, a plurality of fastening members 50A may be arranged in a staggered pattern.

[0065] 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. For example, the first contact portion, the second contact portion, and the connecting portion are not limited to being linear, and may be wavy, etc. The width of the plate member may be slightly shorter or longer than the distance between the left and right ends of the two flanges on the indoor side. Furthermore, the term "board member" does not completely exclude fiber-based insulation materials; if such fiber-based insulation materials have the same hardness as gypsum boards, etc., and can retain their shape in the event of a fire, they are included in the board members of the present invention.

[0066] According to the present invention, the fire resistance of the vertical joints of the exterior wall panels is improved by covering the gaps between the panel frames with hard plate members that can maintain their shape for a long time when heated. Furthermore, in ZEH-compatible wall structures, even when glass wool is laid between the insulation panels and interior materials, high fire resistance can be achieved by sealing the gaps between the panel frames with hard plate members.

[0067] 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]

[0068] 100 exterior wall, 1 exterior wall panel, 10 panel frame, 11 vertical frame, 11a vertical frame surface, 11b vertical frame back surface, 12 horizontal frame, 12a horizontal frame surface, 12b horizontal frame back surface, 14 insulation panel, 15 exterior insulation material, 16 furring strip, 18 exterior material, 2 interior material, 22 stud, 3 vertical joint portion, 40 plate member, 41 surface, 42 back surface, 43 side, 44 underside, 50 (50A) fastening member, 51 first abutment portion, 52 second abutment portion, 53 connection portion, 54 overlap portion, 60 support member, 7 fastener, 71 tip portion

Claims

1. A fire-resistant structure for vertical joints between exterior wall panels having panel frames, a plate member having fire resistance and covering the gap between adjacent panel frames in the left-right direction from the indoor side; A fire-resistant structure of a vertical joint portion comprising a fastening member that fastens the plate member to the panel frame by sandwiching the plate member and the indoor flange portion of the groove-shaped vertical frame in the panel frame in the thickness direction.

2. the fastening member is formed in a substantially U-shape and has a first abutting portion that abuts against the front surface of the plate member and a second abutting portion that abuts against the back surface of the flange portion, The fire-resistant structure for a vertical joint according to claim 1 , wherein the plate member is fastened to the panel frame by an elastic force of at least one of the first abutment portion and the second abutment portion.

3. 3. The fire-resistant structure of claim 1, further comprising a support member attached to a channel-shaped horizontal frame and supporting the plate member from below.

4. The support member is a first hooking portion that hooks onto one lower horizontal frame of the left and right adjacent panel frames; a second hooking portion that hooks onto the other lower horizontal frame of the adjacent panel frames; The fire-resistant structure of claim 3 , further comprising: a rest portion connected to the first hook portion and the second hook portion, on which the lower surface of the plate member is placed.

5. the fastening member has a first contact portion that contacts the front surface of the plate member and a second contact portion that contacts the back surface of the flange portion, The fire-resistant structure for a vertical joint according to claim 1 , further comprising a fastener for fastening the first abutment portion and the plate member together.

6. The pair of left and right fastening members are arranged facing each other so as to have overlapping portions where the first abutment portions overlap each other, The fire-resistant structure of claim 5 , wherein the fastener penetrates the overlapping portion.

7. A fire-resistant device applied to a vertical joint between exterior wall panels having a panel frame, a plate member having fire resistance and configured to cover the gap between adjacent panel frames in the left-right direction from the indoor side; and a fastening member that, in an installed state, fastens the plate member to the panel frame by sandwiching the plate member and the indoor flange portion of the groove-shaped vertical frame of the panel frame in the thickness direction.

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