Seam-type folded-plate roof joint structure

Abstract

To provide a seam-type folded-plate roof joint structure capable of more easily joining roof materials.SOLUTION: A seam-type folded-plate roof joint structure 1 includes a joint material 10 for connecting opposed end parts of roof materials 2, 3 in a state of juxtaposing the roof materials 2, 3 being seam type folded-plate roofs so as to be opposed in the longitudinal direction. The joint material 10 includes an upper overlapping part 11 fitted to the end of the roof material 3 in a state of overlapping the upper side of the end of the roof material 3, a lower overlapping part 12 fitted to the end of the roof material 2 in a state of overlapping the lower side of the end of the roof material 2, and a slope part 13 extending in the short direction of the roof materials 2, 3 so as to partition the upper overlapping part 11 and the lower overlapping part 12, and connecting the upper overlapping part 11 and the lower overlapping part 12 located at different positions when viewed from the longitudinal direction. The roof materials 2, 3 extend in a uniform shape in the longitudinal direction, and are formed in the same cross-sectional shape cut along the short direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seam-type folded plate roof joint structure. [Background technology]

[0002] The joint structure of the folded plate roof panels described in Patent Document 1 connects the first and second folded plate roof panels by installing the above-water end of the second folded plate roof panel in a recess formed in the below-water end of the first folded plate roof panel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-010645 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, it is necessary to use a press molding machine to form recesses in the connection ends of the folded-plate roof panels (see paragraph 0040 of Patent Document 1), which is time-consuming. The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a seam-type folded-plate roof joint structure that allows roof materials to be joined more easily. [Means for solving the problem]

[0005] In order to achieve the above object, the seam-type folded plate roof joint structure of the present invention is a seam-type folded plate roof. The seam-type folded plate roof joint structure is provided with a joint material that connects the opposing ends of the first and second roofing materials when the first and second roofing materials are arranged opposite each other in the longitudinal direction, and the joint material has an upper overlapping portion that fits into the end of the first roofing material when overlapping the upper side of the end of the first roofing material, and a lower overlapping portion that fits into the end of the second roofing material when overlapping the lower side of the end of the second roofing material, and a boundary portion that extends in the short direction of the first and second roofing materials to separate the upper overlapping portion and the lower overlapping portion, and connects the upper overlapping portion and the lower overlapping portion, which are in different positions when viewed from the long direction, and the first and second roofing materials extend in a uniform shape in the long direction, and the cross-sectional shapes when cut along the short direction are formed to be identical to each other. [Effects of the Invention]

[0006] According to the present invention, roofing materials can be joined more easily. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is an exploded perspective view of a roof material and a seam-type folded-plate roof joint structure according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a state in which roofing materials are joined by a joint material according to one embodiment of the present invention. FIG. [Figure 3] 1 is a cross-sectional view of a roof material and a seam-type folded-plate roof joint structure according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] A seam-type folded-plate roof joint structure according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, the seam-type folded-plate roof joint structure 1 comprises a joint material 10 that connects two roof materials 2, 3 in their longitudinal direction, a retaining clip support material 20, a tight frame 30, and retaining clips 41, 42.

[0009] Each roofing material 2, 3 is a square-seam folded-plate roofing structure that has a uniform shape in the longitudinal direction and has the same shape when viewed in the longitudinal direction. Adjacent roofing materials 4, 5 (see Figure 3), which are also square-seam folded-plate roofing structures, are connected to both sides of the short sides of roofing materials 2, 3. Roofing materials 2, 3 are aligned in the longitudinal direction, and the opposing ends of roofing materials 2, 3 are connected by joint material 10. For example, roofing material 2 is located above water and roofing material 3 is located below water, so rainwater flows from roofing material 2 to roofing material 3.

[0010] As shown in FIG. 1, the roofing material 2 includes an upper seam portion 2A, a lower seam portion 2B, a bottom wall portion 2C, and side wall portions 2D and 2E. The bottom wall portion 2C has a flat plate shape along the short dimension direction and the long dimension direction, and has a rectangular plate shape that is long in the long dimension direction. The side walls 2D and 2E are erected on both edges of the bottom wall 2C in the short dimension direction and are inclined so as to extend outward in the short dimension direction as they extend upward. The upper ends of the side walls 2D and 2E are bent in a direction parallel to the bottom wall 2C so as to extend outward in the short dimension direction.

[0011] The upper seam portion 2A is located at the upper end of the side wall portion 2D, on the outer side in the short length direction, and has a shape that covers an upper seam portion 12A (described later) of the joint material 10 from above, that is, a U-shape that opens downward. The lower seam portion 2B is located at the upper end of the side wall portion 2E, on the outside in the short dimension direction, and has a shape that fits into the inside of the lower seam portion 12B of the joint material 10 described later, i.e., a C-shape that opens inward in the short dimension direction. Like the roofing material 2, the roofing material 3 includes an upper seam portion 3A, a lower seam portion 3B, a bottom wall portion 3C, and side wall portions 3D and 3E.

[0012] As shown in FIG. 1, the joint material 10 includes an upper overlapping portion 11, a lower overlapping portion 12, and a slope portion 13. The joint material 10 is manufactured by pressing a single metal plate. Each overlapping portion 11, 12 has the same shape as the roofing materials 2, 3 when viewed in the longitudinal direction, but is a different size. Each overlapping portion 11, 12 includes an upper seam portion 11A, 12A, a lower seam portion 11B, 12B, a bottom wall portion 11C, 12C, and side wall portions 11D, 11E, 12D, 12E. The longitudinal length of the joint material 10 is shorter than the longitudinal length of the roofing materials 2, 3, and is formed by the length of the two opposing ends of the roofing materials 2, 3. For example, the longitudinal length of each roofing material 2, 3 is 10 m to 30 m, while the length of the joint material 10 is 10 cm to 30 cm. The length of the joint material 10 is set, for example, to 1 / 300 to 1 / 30 of the length of each of the roof materials 2, 3. The upper overlapping portion 11 and the lower overlapping portion 12 have the same length in the longitudinal direction.

[0013] The lower overlap portion 12 is shaped to fit along the underside of the end of the roofing material 2, and in the assembled state, the upper seam portion 12A fits into the upper seam portion 2A, and the lower seam portion 12B embraces the lower seam portion 2B from the outside. In more detail, as shown in Figure 3, the upper seam portion 12A, side walls 12D, 12E, and bottom wall 12C of the lower overlap portion 12 are positioned along the underside of the upper seam portion 2A, side walls 2D, 2E, and bottom wall 2C of the roofing material 2, and the bottom seam portion 12B of the lower overlap portion 12 is positioned along the outer surface of the bottom seam portion 2B of the roofing material 2.

[0014] The upper overlap portion 11 is shaped to fit along the upper surface of the end of the roofing material 3, and in the assembled state, the upper seam portion 3A fits into the upper seam portion 11A, and the lower seam portion 11B is held from the outside by the lower seam portion 3B. In more detail, the upper seam portion 11A, side walls 11D, 11E, and bottom wall 11C of the upper overlap portion 11 are positioned along the upper surfaces of the upper seam portion 3A, side walls 3D, 3E, and bottom wall 3C of the roofing material 3, and the lower seam portion 11B of the upper overlap portion 11 is positioned along the inner surface of the lower seam portion 3B of the roofing material 3. As shown in FIG. 2, in the assembled state, the lower overlapping portion 12 is covered and hidden by the end of the roofing material 2, and the upper overlapping portion 11 covers and hides the end of the roofing material 3.

[0015] The upper seam portion 11A is U-shaped and fits along the outer surface (upper surface) of the upper seam portion 3A, and the upper seam portion 12A is U-shaped and fits along the inner surface (lower surface) of the upper seam portion 2A. Therefore, the upper seam portion 11A is formed to be one size larger (the thickness of the joint material 10 plus a margin) than the upper seam portion 12A when viewed in the longitudinal direction. The bottom seam portion 11B is U-shaped and fits along the inner surface of the bottom seam portion 3B (the surface surrounded on three sides by the bottom seam portion 3B), and the bottom seam portion 12B is U-shaped and fits along the outer surface of the bottom seam portion 2B (the surface exposed to the retaining clip support material 20). For this reason, the bottom seam portion 12B is formed to be one size larger (the thickness of the joint material 10 plus a margin) than the bottom seam portion 11B when viewed in the longitudinal direction. In addition, the bottom wall portion 12C and the side wall portions 12D, 12E are formed to be one size larger (the thickness of the joint material 10 plus a margin) than the bottom wall portion 11C and the side wall portions 11D, 11E when viewed in the longitudinal direction.

[0016] The slope portion 13 has an inclined surface connecting the upper overlap portion 11 and the lower overlap portion 12. The slope portion 13 forms the boundary between the upper overlap portion 11 and the lower overlap portion 12 and is formed over the entire area of the joint material 10 in the short direction. The slope portion 13 includes an upper seam connecting portion 13a connecting the upper seam portions 11A and 12A, a lower seam connecting portion 13b connecting the lower seam portions 11B and 12B, and a main body connecting portion 13c connecting the bottom wall portion 11C and the side wall portions 11D and 11E to the bottom wall portion 12C and the side wall portions 12D and 12E. The upper seam connecting portion 13a is formed so that the cross-sectional shape when cut along the short direction gradually increases from the upper seam portion 12A toward the upper seam portion 11A. Bottom seam connecting portion 13b is formed so that the cross-sectional shape when cut along the short length direction gradually becomes smaller from bottom seam portion 12B to bottom seam portion 11B. Main body connecting portion 13c is formed so that the cross-sectional shape when cut along the short length direction gradually becomes smaller from bottom wall portion 12C and side wall portions 12D, 12E to bottom wall portion 11C and side wall portions 11D, 11E. The inclination angle of slope portion 13 is an acute angle, for example, 20° to 40°, with respect to the direction in which rainwater flows down within roof materials 2, 3. 2, the sloped portion 13 allows the side wall portions 2D and 11D, the side wall portions 2E and 11E, and the bottom wall portions 2C and 11C to be positioned on approximately the same plane, thereby reducing steps at the joints. In addition, the sloped portion 13 prevents foreign matter contained in rainwater from accumulating.

[0017] As shown in Figures 1 and 3, the tight frame 30 is a metal fitting that supports the roofing materials 2, 3, 4, and 5 and the joint material 10 from below. The tight frame 30 is a corrugated plate with alternating peaks 35 and valleys 36 in the short dimension. The valleys 36 extend in the short dimension and are fixed to the mounting surface, such as a beam. When viewed in the long dimension, the peaks 35 are in the shape of an isosceles triangle with a substantially flat apex. Each peak 35 is located within a cavity between the side walls of the roofing materials 2, 3, 4, and 5 that are lined up in the short dimension.

[0018] As shown in the enlarged view of FIG. 3, the mountain portion 35 includes a convex portion 31 and a mounting portion 32 having a positioning shaft portion 33 . The installation portion 32 has a plate shape extending in the long and short directions. The convex portion 31 is located adjacent to the installation portion 32 in the short direction and has a convex shape upward relative to the installation portion 32. The positioning shaft portion 33 is a cylindrical screw shaft that is installed on the upper surface of the installation portion 32 .

[0019] As shown in FIGS. 1 and 3, the retaining clip support member 20 is elongated in the longitudinal direction and is fixed to the upper surface of the mountain portion 35. The retaining clip support member 20 comprises multiple plate portions 21 to 25 that are connected in different directions. Specifically, the retaining clip support member 20 comprises end plate portions 21 and 25, main plate portions 22 and 24, and a connecting plate portion 23. The main plate portion 22 is located on the upper surface of the convex portion 31. The main plate portion 24 is located on the upper surface of the installation portion 32. The connecting plate portion 23 extends in the height direction to connect the main plate portions 22 and 24. The end plate portions 21 and 25 are located at both ends of the retaining clip support member 20 in the short dimension direction and extend along the inclined wall portions of the peak portions 35, preventing the retaining clip support member 20 from shifting in position in the short dimension direction. Recesses 20a that fit into the tops of the peak portions 35 are formed on the undersides of the retaining clip support member 20 (plate portions 21 to 25) across the entire short dimension. In FIG. 1, the recess 20a is illustrated as a bulge in the retaining clip support member 20 when viewed from above.

[0020] Furthermore, the retaining clip support material 20 includes two support shafts 27, 28 and a positioning hole 26. The positioning hole 26 is a round hole formed in the center of the main plate portion 24 extending in the longitudinal direction, and through which the positioning shaft 33 passes. The positioning hole 26 is located opposite the slope portion 13 (the center portion of the joint material 10 in the longitudinal direction) in the short direction. With the positioning shaft 33 passing through the positioning hole 26, a nut (not shown) is screwed onto the positioning shaft 33, thereby fixing the retaining clip support material 20 to the installation portion 32 of the ridge portion 35 of the tight frame 30.

[0021] The two support shafts 27, 28 are cylindrical screw shafts that are located at both ends in the longitudinal direction of the upper surface of the main plate 24 and extend in the height direction. The two support shafts 27, 28 support retaining clips 41, 42, and nuts 45 are screwed onto each of them to fix the retaining clips 41, 42 to the retaining clip support material 20. The support shaft 27 is located at the center of the upper overlapping portion 11 in the longitudinal direction, and the support shaft 28 is located at the center of the lower overlapping portion 12 in the longitudinal direction.

[0022] The retaining clip 41 is formed so as to suspend the bottom seam portions 2B and 12B that are fitted together while overlapping each other, and the retaining clip 42 is formed so as to suspend the bottom seam portions 3B and 11B that are fitted together while overlapping each other. The retaining clips 41 and 42 have the same shape. The retaining clips 41, 42 include a hook portion 43 for hooking onto the bottom seam portions 2B, 12B or 3B, 11B, and a fixing portion 44 that is fixed to the retaining clip support material 20. The fixing portion 44 has a hole through which the support shafts 27, 28 pass, and is located on the upper surface of the main plate portion 24. The fixing portion 44 is fixed to the upper surface of the main plate portion 24 by screwing a nut 45 (see the enlarged view in FIG. 3) onto the support shafts 27, 28. The hook portion 43 is connected to the fixing portion 44 and is bent into an inverted V shape so that the upper ends of the lower seam portions 2B, 12B or 3B, 11B can be hooked therein.

[0023] Next, a method for joining two roof materials 2, 3 using the seam-type folded-plate roof joint structure 1 will be described. The valley portion 36 of the tight frame 30 is fixed to the surface to be constructed, such as a beam, and a retaining clip support material 20 is attached to one of the multiple peak portions 35 of the tight frame 30, which is the joint between the two roof materials 2, 3. Then, as shown in Figure 1, first, roofing material 3 is installed on the surface to be installed. Then, the upper overlapping portion 11 of joint material 10 is fitted onto the upper surface of the end of roofing material 3 via a waterproof coating. Next, the end of roofing material 2 is fitted onto the upper surface of the lower overlapping portion 12 of joint material 10 via a waterproof coating. When installing roofing materials 2, 3 and joint material 10, the upper seam portions 2A, 3A, 11A, 12A of roofing materials 2, 3 and joint material 10 are placed from above over the bottom seam portion 4B (see Figures 2 and 3) of the adjacent roofing material 4 that has already been installed.

[0024] Additionally, the overlapping bottom seam portions 2B, 12B or 3B, 11B are supported by retaining clips 41, 42. In this state, as shown in Figures 2 and 3, the top seam portion 5A of the adjacent roofing material 5 is placed over the bottom seam portions 2B, 12B and 3B, 11B from above. Then, by using a seam tightening machine (not shown) to tighten the top seam portions 2A, 3A, 11A, 12A to the bottom seam portion 4B, and the top seam portion 5A to the bottom seam portions 2B, 3B, 11B, 12B, the roofing materials 2, 3, 4, 5 can be integrated. In addition, the adjacent roof materials 4, 5 may also be made up of two roof materials, similar to the roof materials 2, 3, and connected by another seam-type folded-plate roof joint structure 1. In this case, multiple seam-type folded-plate roof joint structures 1 are arranged in the short length direction. Furthermore, the seam-type folded-plate roof joint structure 1 may be applied to a newly constructed roof material, or may be applied to a roof material that is constructed to cover an existing roof.

[0025] (effect) According to the embodiment described above, the following effects are achieved. (1) The hip-jointed folded-plate roof joint structure 1 includes a joint material 10 that connects the opposing ends of roofing materials 2 and 3, which are examples of first and second roofing materials that are hip-jointed folded-plate roofs, arranged facing each other in the longitudinal direction. The joint material 10 includes an upper overlapping portion 11 that fits over the end of roofing material 3, which is an example of the first roofing material, while overlapping the upper side of the end of roofing material 3; a lower overlapping portion 12 that fits over the lower side of the end of roofing material 2, which is an example of the second roofing material, while overlapping the lower side of the end of roofing material 2; and a slope portion 13 that extends in the transverse direction of the roofing materials 2 and 3 to separate the upper overlapping portion 11 from the lower overlapping portion 12 and is an example of a boundary portion that connects the upper overlapping portion 11 and the lower overlapping portion 12, which are located at different positions when viewed in the longitudinal direction. The roofing materials 2 and 3 extend in a uniform shape in the longitudinal direction, and have the same cross-sectional shape when cut along the transverse direction. According to this configuration, by using the joint material 10, when joining the roof materials 2, 3, there is no need to process the connecting ends of the roof materials 2, 3, and the roof materials 2, 3 can be joined more easily. Furthermore, by transporting the roofing materials 2 and 3 to the work site and joining the roofing materials 2 and 3 at the work site with the joint material 10, it is possible to accommodate the roofs of large buildings.

[0026] (2) The roofing materials 2, 3 are provided with upper seam portions 2A, 3A, which are located at one end in the short dimension (left side in Figures 1 and 2) and are an example of a first upper seam portion that is U-shaped or C-shaped and opens downward, and lower seam portions 2B, 3B, which are located at the other end in the short dimension (right side in Figures 1 and 2) and are an example of a first lower seam portion that is U-shaped or C-shaped and opens inward in the short dimension. The upper overlap portion 11 is provided with upper seam portion 11A, which is an example of a second upper seam portion that fits into the upper seam portion 3A of the roofing material 3 so as to cover the upper seam portion 3A of the roofing material 3 from above, and lower seam portion 11B, which is an example of a second lower seam portion that is located at one end in the short dimension and fits inside the lower seam portion 3B of the roofing material 3. The lower overlap portion 12 is located at one end in the short length direction and comprises an upper seam portion 12A, which is an example of a third upper seam portion that fits inside the upper seam portion 2A of the roofing material 2, and a lower seam portion 12B, which is an example of a third lower seam portion that is located at the other end in the short length direction and fits outside the lower seam portion 2B of the roofing material 2. According to this configuration, the joint material 10 can be tightly fitted to the roof materials 2 and 3, and the two roof materials 2 and 3 can be integrated by the joint material 10. Since the two roof materials 2, 3 are integrated via the joint material 10, the roof materials 2, 3 can be easily handled as an integrated part at the work site.

[0027] (3) The seam-type folded-plate roof joint structure 1 comprises a tight frame 30 having a peak 35, a retaining clip support member 20 fixed to the upper surface of the peak 35 and extending in the longitudinal direction, and retaining clips 41, 42, which are examples of first and second retaining clips fixed to both ends of the retaining clip support member 20. The retaining clip 42 supports the bottom seam portion 3B of the roof material 3 and the bottom seam portion 11B of the joint material 10 in an overlapping and fitted state, and the retaining clip 41 supports the bottom seam portion 2B of the roof material 2 and the bottom seam portion 12B of the joint material 10 in an overlapping and fitted state. According to this configuration, when joining two roof materials 2, 3 with the joint material 10, there is no need to prepare a plurality of tight frames 30. Therefore, the configuration can be made simpler.

[0028] (4) Roofing material 2 is located above the waterline relative to roofing material 3. Slope portion 13 is located opposite the underwater edge of roofing material 2 and connects the upper surface of bottom wall portion 12C of lower overlapping portion 12 and the upper surface of bottom wall portion 11C of upper overlapping portion 11 with an inclined surface. With this configuration, even if rainwater containing foreign matter such as soil and sand flows, the foreign matter is less likely to accumulate because it flows downstream via slope portion 13. Specifically, rainwater containing foreign matter flows in the following order: bottom wall portion 2C → slope portion 13 → bottom wall portion 11C → bottom wall portion 3C.

[0029] The present invention is not limited to the above-described embodiments and drawings. Modifications (including the omission of components) can be made as appropriate within the scope of the present invention. An example of a modification will be described below.

[0030] (Variation) In the above embodiment, the retaining clip support member 20 of the seam-type folded-plate roof joint structure 1 may be omitted. In this case, the retaining clips 41 and 42 may be fixed to different tight frames 30, respectively.

[0031] In the above embodiment, the roofing materials 2, 3 and the joint material 10 are of the square seam type, but they may be of a type other than the square seam type, for example, they may be of the round seam type or the half round seam type. In the above embodiment, the slope portion 13 may be a step portion having a step difference. In the above embodiment, either one of the upper seam portions 11A, 12A and the lower seam portions 11B, 12B of the joint material 10 may be omitted. [Explanation of symbols]

[0032] 1... Seam-type folded plate roof joint structure, 2, 3... Roof material, 2A, 3A, 5A, 11A, 12A... Upper seam section, 2B, 3B, 4B, 11B, 12B... Lower seam section, 2C, 3C, 11C, 12C... Bottom wall section, 2D, 2E, 3D, 3E, 11D, 11E, 12D, 12E... Side wall section, 4, 5... Adjacent roof material, 10... Joint material, 13... Throw 1. retaining clip portion, 20... retaining clip support material, 20a... recess, 21, 25... end plate portion, 22, 24... main plate portion, 23... connecting plate portion, 26... positioning hole, 27, 28... support shaft portion, 30... tight frame, 31... convex portion, 32... installation portion, 33... positioning shaft portion, 35... peak portion, 36... valley portion, 41, 42... retaining clip, 43... hook portion, 44... fixing portion, 45... nut

Claims

1. The roof structure is provided with a joint material that connects the opposing ends of the first and second roof materials, which are seam-type folded plate roofs, in a state where the first and second roof materials are arranged so as to face each other in the longitudinal direction, The joint material is an upper overlapping portion that fits onto the end of the first roof material in a state where it overlaps the upper side of the end of the first roof material; a lower overlapping portion that fits onto the end of the second roof material in a state where it overlaps the lower side of the end of the second roof material; a boundary portion extending in the short direction of the first and second roofing materials so as to separate the upper overlap portion and the lower overlap portion, and connecting the upper overlap portion and the lower overlap portion at different positions when viewed from the long direction; The first and second roofing materials extend in a uniform shape in the long dimension direction, and cross-sectional shapes cut along the short dimension direction are formed to be identical to each other. Seam-type folded plate roof joint structure.

2. The first and second roofing materials are A first upper seam portion located at one end side in the short length direction and having a U-shape that opens downward; a first lower seam portion located on the other end side in the short length direction and having a U-shape that opens toward the inside in the short length direction; The upper overlapping portion is A second upper seam portion is located on one end side in the short length direction and fits into the first upper seam portion of the first roofing material so as to cover the first upper seam portion of the first roofing material from above; a second bottom seam portion located on the other end side in the short length direction and fitted inside the first bottom seam portion of the first roofing material; The lower overlapping portion is a third upper seam portion located on one end side in the short length direction and fitted inside the first upper seam portion of the second roofing material; a third bottom seam portion located on the other end side in the short length direction and fitted to the outside of the first bottom seam portion of the second roofing material; The seam-type folded plate roof joint structure according to claim 1.

3. The seam-type folded plate roof joint structure is a tight frame having a mountain portion; a retaining clip support member fixed to an upper surface of the mountain portion and extending in the longitudinal direction; a first retaining clip and a second retaining clip fixed to both ends of the retaining clip support member; The first retaining clip supports the first bottom seam portion of the first roof material and the second bottom seam portion of the joint material in an overlapping and fitted state, The second retaining clip supports the first bottom seam portion of the second roof material and the third bottom seam portion of the joint material in an overlapping and fitted state. The seam-type folded plate roof joint structure according to claim 2.

4. The second roofing material is located above the water than the first roofing material, The boundary portion is located opposite the underwater edge of the second roofing material and is a slope portion that connects the upper surface of the bottom wall portion of the lower overlapping portion and the upper surface of the bottom wall portion of the upper overlapping portion with an inclined surface. The seam-type folded plate roof joint structure according to any one of claims 1 to 3.

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