Fire-resistant structure for joints between exterior wall panels

Abstract

To provide a fire-resistant joint structure that can improve the fire resistance of joints between exterior wall panels, such as sandwich panels, with a simple configuration. [Solution] A fire-resistant structure for the joint (21) between adjacent exterior wall panels (1) on the left and right, wherein vertical furring strips (3) for holding the exterior wall panels are arranged within the joint, and the vertical furring strips integrally include an outdoor flange portion (31) that covers the outdoor surface of the exterior wall panel, an indoor flange portion (32) that covers the indoor surface of the exterior wall panel, and a connecting portion (33) that connects the outdoor flange portion and the indoor flange portion.

Description

Technical Field

[0001] The present invention relates to a fire-resistant structure at a joint portion between outer wall panels, and particularly to a fire-resistant structure at a vertical joint portion between outer wall panels whose both sides on the outdoor side and the indoor side are covered with steel plates.

Background Art

[0002] In a building, it is well-known to provide a fire-resistant structure in a gap (vertical joint portion) between adjacent outer wall panels in the left-right direction. For example, Japanese Patent Application Laid-Open No. 2001-98663 (Patent Document 1) attaches a thermally expandable fire-resistant material to an end face on the vertical joint portion side of an outer wall panel, and then seals the vertical joint portion with a joint material.

[0003] By the way, in a steel-frame building such as a logistics facility, an outer wall panel having a metal sandwich structure may be used. This outer wall panel has both sides on the outdoor side and the indoor side covered with steel plates. A fire-resistant structure at a vertical joint portion between this type of outer wall panel (hereinafter also referred to as a "sandwich panel") is proposed in Japanese Patent Application Laid-Open No. 2016-94790 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2016-113838 (Patent Document 3).

[0004] The fire-resistant structure of Patent Document 2 is characterized by including a non-combustible heat-insulating material arranged over the entire width between adjacent barrel edges through the vertical joint portion, and a heat-insulating material pressing member for pressing the non-combustible heat-insulating material in a pressed state.

[0005] The fire-resistant structure of Patent Document 3 is characterized in that a plate-shaped pressing member straddling the vertical joint portion is attached to the back surfaces of adjacent outer wall panels on the left and right, a fire-resistant material is interposed on the indoor side inside the vertical joint portion, and a sealing member is interposed on the outdoor side.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] Because sandwich panels have a steel plate covering the exterior surface, the steel plate deforms when heated from the outside, causing the edges to warp (lift). In this case, the vertical joints expand, and flames penetrate into the interior of the exterior wall panel, which tends to accelerate the combustion of the core material. Therefore, it is thought that suppressing the warping of the steel plate from the exterior side will lead to an improvement in the fire resistance of the vertical joints. This point is not disclosed in Patent Documents 2 and 3.

[0008] The present invention was made to solve the above-mentioned problems, and its objective is to provide a joint fire-resistant structure that can improve the fire resistance of vertical joints between exterior wall panels such as sandwich panels with a simple configuration. [Means for solving the problem]

[0009] To solve the above problems, the fire-resistant joint structure between exterior wall panels according to the present invention is a fire-resistant structure for the joint between adjacent exterior wall panels on the left and right, wherein vertical furring strips for holding the exterior wall panels are arranged within the joint. The vertical furring strips integrally include an outdoor flange portion that covers the outdoor surface of the exterior wall panel, an indoor flange portion that covers the indoor surface of the exterior wall panel, and a connecting portion that connects the outdoor flange portion and the indoor flange portion.

[0010] Preferably, the vertical purlins are made of H-shaped steel.

[0011] Preferably, the vertical furring strips are made up of two channel steel sections joined together at their web portions.

[0012] Preferably, the channel steel has a lip portion provided at the tip of the outdoor flange portion. A gap is formed between the outdoor flange portion and the outdoor surface of the exterior wall panel, and the lip portion closes the gap.

[0013] Preferably, a space is provided between the connecting portion and the side end surface of the exterior wall panel.

[0014] Preferably, a heat-expandable fire-resistant material is provided in the space.

[0015] Preferably, the protruding length from the connecting portion of the indoor flange is greater than the protruding length from the connecting portion of the outdoor flange.

[0016] Preferably, the exterior wall panel is a sandwich panel in which both the exterior and interior sides are covered with steel plates. [Effects of the Invention]

[0017] According to the present invention, the fire resistance performance of the vertical joints between exterior wall panels can be improved with a simple configuration.

[0018] Furthermore, in the case where the exterior wall panel is a sandwich panel with both the exterior and interior sides covered with steel plates, the edge of the exterior steel plate adjacent to the vertical joint can be pressed down by the exterior flange, thereby suppressing the lifting of the steel plate edge due to thermal deformation of the exterior steel plate when heated from the outside. As a result, the edge of the exterior steel plate can be reinforced by the exterior flange, thereby improving the fire resistance of the vertical joint between the sandwich panels. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic front view showing a building exterior wall employing a fire-resistant joint structure according to Embodiment 1 of the present invention. [Figure 2](A) is a cross-sectional view schematically showing the joint part refractory structure according to Embodiment 1, and (B) is a cross-sectional view schematically showing the case where the thermally expandable refractory is attached to the web part in the same structure. [Figure 3] It is a perspective view schematically showing the attachment state of the joint part refractory structure according to Embodiment 1 to the building frame. [Figure 4] It is a cross-sectional view schematically showing the joint part refractory structure according to a modification of Embodiment 1. [Figure 5] It is a front view schematically showing a building outer wall adopting the joint part refractory structure according to Embodiment 2 of the present invention. [Figure 6] (A) is a cross-sectional view schematically showing the joint part refractory structure according to Embodiment 2, and (B) is a cross-sectional view schematically showing the joint part refractory structure according to a modification of Embodiment 2. [Figure 7] It is a front view schematically showing a known building outer wall to which a sandwich panel is applied. [Figure 8] It is a front view schematically showing a known joint part structure between sandwich panels. [Figure 9] It is a schematic diagram for explaining the fire resistance performance of a known joint part structure.

Embodiments for Carrying Out the Invention

[0020] Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their description will not be repeated.

[0021] <Known joint part refractory structure> First, referring to FIGS. 7 to 9, an outline of a known refractory structure of a vertical joint part between outer wall panels will be described. In the same refractory structure, a sandwich panel is adopted as the outer wall panel.

[0022] Figure 7 is a front view (viewed from the outside) showing multiple sandwich panels 1 arranged. Figure 8 is a schematic cross-sectional view showing the fire-resistant structure of the joint, and shows an enlarged view of the cross section VIII enclosed by the dashed line in Figure 7. In Figure 7 and other 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. In Figure 8 and other figures, arrow A3 indicates the indoor side of the depth direction of the sandwich panel 1.

[0023] First, the basic configuration and arrangement of the sandwich panel 1 will be explained. As shown in Figure 7, multiple sandwich panels 1 are arranged in a vertical and horizontal direction to form the exterior wall of the building. A vertical joint 21 is formed between the left and right sandwich panels 1, and a horizontal joint 22 is formed between the upper and lower sandwich panels 1.

[0024] As shown in Figure 8, the sandwich panel 1 is an exterior wall panel in which both the outdoor and indoor sides are covered with steel plates 11 and 12 (shown by thick lines in Figure 8, etc.). The core material 13 of the sandwich panel 1 is made of an organic insulation material such as urethane and is integrated with the steel plates 11 and 12. In other words, the steel plates 11 and 12 are bonded to the core material 13.

[0025] The end portion 11a of the outdoor steel plate 11 (hereinafter referred to as the "outdoor steel plate") adjacent to the vertical joint 21 is bent into an L-shape, and the bent portion 11b is bonded to a part of the side end surface 13a of the core material 13. On the other hand, the end portion 12a of the indoor steel plate 12 (hereinafter referred to as the "indoor steel plate") is not bent, and the remaining part of the side end surface 13a of the core material 13 is exposed.

[0026] A wet or dry non-combustible sealant 131 is filled into the vertical joints 21 between the sandwich panels 1. In addition, a sheet-like or thin plate-like waterproofing material 132 is provided on the back side (indoor side) of the sandwich panels 1. The waterproofing material 132 is attached to the entire mounting surface 14a of the furring strips 14. Note that in Figure 8, a gap is provided between the sealant 131 and the side end surface 13a of the core material 13 for ease of understanding.

[0027] The sandwich panels 1, which are continuous in the vertical direction, are connected by fitting their upper and lower ends together. For example, a projection is formed on the upper end surface, and a groove is formed on the lower end surface to receive the projection (not shown). A furring strip 14 is placed on the indoor side of the sandwich panels 1, and the upper end of each sandwich panel 1 is fixed to the furring strip 14 with fasteners 15 such as screws.

[0028] In the installed state of the sandwich panel 1, the fastener 15 is concealed by the downward projection 1b formed at the lower end of the upper sandwich panel 1. The downward projection 1b overlaps in the inward and outward directions with the recess 1a formed at the upper end of the sandwich panel 1. As shown in Figure 7, the portion of the recess 1a that is not covered by the downward projection 1b of the upper sandwich panel 1 (the exposed portion) forms the horizontal joint 22.

[0029] On the other hand, the sandwich panels 1, which are continuous in the left-right direction, do not overlap, and the gap between two adjacent sandwich panels 1 in the left-right direction forms a vertical joint 21. A furring strip 14 is positioned at the position corresponding to the vertical joint 21 (joint center). The furring strip 14 is typically made of square steel, with the outdoor side forming the mounting surface 14a. The aforementioned fastener 15 is passed through the end of the recessed portion 1a (upper end) of the sandwich panel 1 and fixed to the mounting surface 14a of the furring strip 14.

[0030] Next, with reference to Figure 9, the phenomena that occur when the sandwich panel 1 is heated will be briefly explained. As shown in Figure 9(A), when the exterior wall of the building is heated from the outside, the exterior steel plate 11 warps over time due to thermal deformation, and as shown in Figure 9(B), the ends 11a of the exterior steel plate 11 on both the left and right sides of the vertical joint 21 lift up away from the core material 13.

[0031] In this case, the gap between the lifted outer edge 11a of the outer steel plate 11 and the core material 13 becomes a passage for heat, promoting the combustion of the core material 13. Therefore, even if a non-combustible sealant 131 is filled in the vertical joint 21, the heat from the combustion of the core material 13 may reach the back side of the sandwich panel 1 and cause a fire on the indoor side. Specifically, flames may erupt from the tiny gap between the indoor steel plate 12 of the sandwich panel 1 and the mounting surface 14a (waterproofing material 132) of the furring strip 14.

[0032] In contrast, as described below, the fire-resistant joint structure in the embodiment of the present invention uses vertical furring strips to suppress the lifting (thermal deformation) of the end portion 11a of the outdoor steel plate 11 when heated.

[0033] <Embodiment 1> The fire-resistant joint structure according to Embodiment 1 will be described with reference to Figures 1 to 4. Figure 1 is a front view (viewed from the outside) showing a state in which multiple sandwich panels 1 are arranged. Figure 2(A) is a schematic cross-sectional view showing the fire-resistant joint structure, and shows an enlarged view of the cross section of part IIA enclosed by the dashed line in Figure 1. A part of the vertical furring strips 3 is arranged within the vertical joint 21. The basic configuration and arrangement of the sandwich panels 1 in this embodiment are the same as the basic configuration and arrangement of the known sandwich panels 1 described above, so the explanation will not be repeated.

[0034] (Vertical furring strips) In this embodiment, the vertical furring strip 3 is a stud attached to the building structure such as a beam. In the installed state, the vertical furring strip 3 integrally includes an outdoor flange portion 31 that covers the outdoor surface of the sandwich panel 1, an indoor flange portion 32 that covers the indoor surface of the sandwich panel 1, and a web portion (connecting portion) 33 that connects the outdoor flange portion 31 and the indoor flange portion 32. The plate thickness of the indoor and outdoor flange portions 31, 32 and the web portion 33 is thicker than the indoor and outdoor steel plates 11, 12, for example, about 5.0 to 8.0 mm.

[0035] The vertical furring strip 3 is made of H-shaped steel. Specifically, the vertical furring strip 3 has a web portion 33 that extends linearly in the depth direction within the vertical joint portion 21, a pair of outdoor flange portions 31, 31 that protrude from the web portion 33 on both the left and right sides on the outdoor side, and a pair of indoor flange portions 32, 32 that protrude from the web portion 33 on both the left and right sides on the indoor side.

[0036] Specifically, the outdoor flange portion 31 extends linearly in the left-right direction and includes a portion 31a that contacts the end 11a of the outdoor steel plate 11 and a portion 31b that does not contact the end 11a. The indoor flange portion 32 extends linearly in the left-right direction and includes a portion 32a that contacts the end 12a of the indoor steel plate 12 and a portion 32b that does not contact the end 12a. The web portion 33 is integrally connected to both portions 31b and 32b.

[0037] In other words, the ends of the sandwich panel 1 (the ends 11a and 12a of the indoor and outdoor steel plates 11 and 12) are held in place by being sandwiched from the inside and outside by a pair of outdoor flange portions 31 and a pair of indoor flange portions 32. A sheet-like waterproofing material, etc. (not shown) may be provided between the outdoor flange portion 31 and the end 11a of the outdoor steel plate 11. Similarly, a sheet-like waterproofing material, etc. (not shown) may be provided between the indoor flange portion 32 and the end 12a of the indoor steel plate 12. In other words, the indoor and outdoor flange portions 31 and 32 are in direct or indirect contact with the indoor and outdoor steel plates 11 and 12.

[0038] As shown in Figure 2(B), a heat-expandable fire-resistant material 8 may be provided in the space α1 between the web portion 33 and the side end surface 10a of the sandwich panel 1. The heat-expandable fire-resistant material 8 is a tape-like or sheet-like product that expands several times when heated to a high temperature of, for example, 200 degrees Celsius or higher. The heat-expandable fire-resistant material 8 may be attached to the web portion 33 as shown in Figure 2(B), or it may be attached to the side end surface 10a.

[0039] (Example of sandwich panel installation) Referring to Figure 3, an example of how to install sandwich panel 1 will be explained. Note that the dimensions of sandwich panel 1 are, for example, a height of 60-100 cm and a thickness of 5-10 cm.

[0040] First, multiple vertical furring strips 3 are arranged intermittently along the left-right direction, and the indoor flange portions 32 are fixed to the beam 7 via fasteners 6 such as angle materials. Note that the vertical furring strips 3 may also be attached to the beam 7 by welding.

[0041] Next, the sandwich panel 1, which has been lifted by a crane or the like, is dropped from above between the adjacent vertical furring strips 3, 3 on the left and right. At this time, the left and right ends of the exterior wall panel 1 are inserted between the outdoor flange portion 31 and the indoor flange portion 32.

[0042] Fasteners 15, such as screws, are attached to the recessed portions 1a (left and right ends) at the upper end of the sandwich panel 1, thereby fastening the recessed portions 1a to the indoor flange portion 32 and fixing the sandwich panel 1 to the vertical furring strip 3.

[0043] Subsequently, another sandwich panel 1 is similarly dropped between the left and right vertical furring strips 3 above the fixed sandwich panel 1, and the two sandwich panels 1,1 are positioned vertically such that the downward projection 1b formed at the lower end of the other sandwich panel 1 and the recessed portion 1a of the already fixed sandwich panel 1 overlap in the inward and outward directions. In this way, multiple sandwich panels 1 are aligned vertically along the vertical furring strips 3.

[0044] The recessed portion 1a may be fixed to the indoor flange portion 32 by attaching the fastener 15 at an angle, avoiding the outdoor flange portion 31. Alternatively, a hole may be drilled in the portion of the outdoor flange portion 31 corresponding to the attachment point of the fastener 15, and the fastener 15 may be attached by passing a tool (such as a drill driver bit) through the hole.

[0045] Alternatively, as shown in Figure 4, the protrusion length L2 of the indoor flange portion 32 from the web portion 33 may be greater than the protrusion length L1 of the outdoor flange portion 31 from the web portion 33. In this case, since the indoor flange portion 32 protrudes outward in the left-right direction more than the outdoor flange portion 31, it becomes easier to attach the fastener 15 to the recessed portion 1a from the outdoor side.

[0046] (Effects and Benefits) According to this embodiment, the left and right ends of the sandwich panel 1 are held in place by the outdoor flange portion 31 and the indoor flange portion 32, so that even when heated from the outdoor side, the lifting of the end 11a due to thermal deformation of the outdoor steel plate 11 can be suppressed. As a result, heat input into the gap between the end 11a of the outdoor steel plate 11 and the core material 13 can be suppressed, and flames can be prevented from igniting on the back side (indoor side) of the sandwich panel 1, as shown in Figure 9(B).

[0047] Furthermore, because the vertical joint 21 is sealed from both the inside and outside by the indoor and outdoor flange portions 31 and 32 of the vertical furring strip 3, there is no need to provide separate special hardware to improve the fire resistance of the vertical joint 21. This reduces the number of parts, leading to cost reduction and improved work efficiency. In addition, because the vertical furring strip 3 attached to the building structure and the sandwich panel 1 are arranged on the same line, the thickness of the building's exterior wall can be reduced, making the interior space larger.

[0048] <Embodiment 2> The fire-resistant joint structure according to Embodiment 2 will be described with reference to Figures 5 and 6. Figure 5 is a front view (viewed from the outside) showing a state in which vertical furring strips 3A are provided in the vertical joint 21 between sandwich panels 1. Figure 6(A) is a schematic cross-sectional view showing the fire-resistant joint structure, and shows an enlarged cross-section of the portion VIA enclosed by the dashed line in Figure 5. In the following, only the differences from Embodiment 1 will be described, and the same configuration as in Embodiment 1 will not be repeated.

[0049] In Embodiment 1 described above, a vertical furring strip 3 made of H-shaped steel was explained. However, in this embodiment, as shown in Figure 6(A), the vertical furring strip 3A is constructed by joining two channel steel sections 4, 4 back to back. The thickness of the channel steel section 4 is thicker than the indoor and outdoor steel plates 11, 12, for example, about 1.6 to 6.0 mm. The vertical furring strip 3A can be constructed by joining commercially available channel steel sections.

[0050] Each channel steel section 4 integrally includes an outdoor flange section 41 that covers the outdoor surface of the sandwich panel 1, an indoor flange section 42 that covers the indoor surface of the sandwich panel 1, and a web section 43 that connects the outdoor flange section 41 and the indoor flange section 42.

[0051] In this embodiment, the connecting portion 33A is formed by joining two web portions 43, 43 together. This joining can be done, for example, by pre-welding the web portions 43 together in the factory, or by assembling them on-site with the web portions 43 joined together with bolts (joining stitches).

[0052] The vertical furring strip 3A has a connecting portion 33A that extends linearly in the depth direction within the vertical joint portion 21, a pair of outdoor flange portions 41, 41 that protrude to the left and right from the connecting portion 33A on the outdoor side, and a pair of indoor flange portions 42, 42 that protrude to the left and right from the connecting portion 33A on the indoor side.

[0053] Specifically, the outdoor flange portion 41 extends linearly in the left-right direction and includes a portion 41a that contacts the end 11a of the outdoor steel plate 11 and a portion 41b that does not contact the end 11a. The indoor flange portion 42 extends linearly in the left-right direction and includes a portion 42a that contacts the end 12a of the indoor steel plate 12 and a portion 42b that does not contact the end 12a. The connecting portion 33A is integrally connected to portions 41b and 42b.

[0054] (Other examples of vertical furring strip configurations) Figure 6(B) schematically shows a vertical furring strip 3B according to a modified example of this embodiment. In this modified example, the vertical furring strip 3B is constructed by joining two lipped channel steel (C-shaped steel) 5,5 back to back.

[0055] Each C-shaped steel section 5 integrally includes an outdoor flange section 51 that covers the outdoor surface of the sandwich panel 1, an indoor flange section 52 that covers the indoor surface of the sandwich panel 1, and a web section 53 that extends linearly in the depth direction within the vertical joint section 21 and connects the outdoor flange section 51 and the indoor flange section 52.

[0056] In this example as well, the connecting portion 33B is formed by joining two web portions 53, 53 together. The vertical furring strip 3B has a pair of outdoor flange portions 51, 51 that protrude to the left and right from the connecting portion 33B on the outdoor side, and a pair of indoor flange portions 52, 52 that protrude to the left and right from the connecting portion 33B on the indoor side.

[0057] The outdoor flange portion 51 and the outdoor steel plate 11 are spaced apart from each other in the depth direction, and a gap α21 is formed between them. A lip portion 541 is integrally provided with the outdoor flange portion 51 on the left and right sides of the outdoor flange portion 51. The lip portion 541 extends toward the outdoor steel plate 11 and contacts the end portion 11a of the outdoor steel plate 11. In this way, the gap α21 is closed by the lip portion 541.

[0058] The indoor flange portion 52 and the indoor steel plate 12 are spaced apart in the depth direction, and a gap α22 is formed between them. A lip portion 542 is integrally provided with the indoor flange portion 52 on the left and right sides of the indoor flange portion 52. The lip portion 542 extends toward the indoor steel plate 12 and contacts the end portion 12a of the indoor steel plate 12. In this way, the gap α22 is closed by the lip portion 542.

[0059] In this modified example, the ends 11a and 12a of the indoor and outdoor steel plates 11 and 12 are held in place by the indoor and outdoor lip portions 541 and 542. Furthermore, the gap α21 on the outdoor side acts as an insulating layer of air against heating from the outdoor side.

[0060] Therefore, when heating from the outside, heat conduction to the outdoor steel plate 11 is suppressed, and the lifting of the end portion 11a due to thermal deformation of the outdoor steel plate 11 can be reduced. Furthermore, this lifting can be suppressed by the lip portion 541. Note that on the indoor side of the vertical furring strip 3B, the lip portion 542 may not be provided, and the indoor flange portion 52 may extend in contact with the indoor steel plate 12, as shown in Figure 6(A). Note that the configurations of this example and the embodiments described above may be combined as appropriate.

[0061] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of Symbols]

[0062] 1 Exterior wall panel (sandwich panel), 10a side end face, 11 exterior steel plate, 11a end, 12 interior steel plate, 12a end, 15 fastener, 21 vertical joint, 22 horizontal joint, 3 (3A, 3B) vertical furring strip, 31 (41, 51) exterior flange, 32 (42, 52) interior flange, 33 (43, 53) web (connecting part)

Claims

1. A fire-resistant structure in the joint between adjacent exterior wall panels, The vertical furring strips for holding the exterior wall panel are arranged within the joint. The vertical furring strip integrally includes an outdoor flange portion that covers the outdoor surface of the exterior wall panel, an indoor flange portion that covers the indoor surface of the exterior wall panel, and a connecting portion that connects the outdoor flange portion and the indoor flange portion, forming a fire-resistant joint structure between exterior wall panels.

2. The fire-resistant joint structure between exterior wall panels according to claim 1, wherein the vertical furring strips are made of H-shaped steel.

3. The fire-resistant joint structure between exterior wall panels according to claim 1, wherein the vertical furring strip is composed of two channel steel sections joined together.

4. The channel steel has a lip portion provided at the tip of the outdoor flange portion, The fire-resistant joint structure between exterior wall panels according to claim 3, wherein a gap is formed between the exterior flange portion and the exterior surface of the exterior wall panel, and the gap is closed by the lip portion.

5. The fire-resistant joint structure between exterior wall panels according to claim 1, wherein a space is provided between the connecting portion and the side end surface of the exterior wall panel.

6. The fire-resistant joint structure between exterior wall panels according to claim 5, wherein a heat-expandable fire-resistant material is provided in the space.

7. The fire-resistant joint structure between exterior wall panels according to claim 1, wherein the protrusion length of the indoor flange portion from the connecting portion is greater than the protrusion length of the outdoor flange portion from the connecting portion.

8. The fire-resistant joint structure between exterior wall panels according to any one of claims 1 to 7, wherein the exterior wall panel is a sandwich panel in which both the outdoor and indoor sides are covered with steel plates.

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