roofing materials

Abstract

To provide a roof material which has improved strength and which can be easily molded.SOLUTION: A roof material (2) comprises a pair of seam fastening parts (26), a bottom part (22) and a pair of inclined parts (23). The inclined part includes a fitting part (24) fitted with a tight frame (3), a first inclined portion (51), a second inclined portion (52), a first folded surface part (55), a third inclined portion (53), a fourth inclined portion (54) and a second folded surface part (56).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to roofing materials. [Background technology]

[0002] A roof structure constructed by connecting multiple folded plates formed by bending a single steel plate is known in the prior art. The multiple folded plates are installed on the beams using a tight frame attached to the beams. This type of roof structure is strong because it is made of folded plates, and is lighter than tile roofs, etc., so it has high earthquake resistance and is easy to install. For this reason, it is suitable for use on the roofs of large buildings such as factories and warehouses.

[0003] For example, Patent Document 1 listed below discloses a seam-engaged thin folded plate roof component in which peak flat portions and valley flat portions (bottom portions) are formed alternately and in series, with rising portions (inclined portions) formed continuously between the peak flat portions and valley flat portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3223928 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional technology, the flat peaks and flat valleys are separated from the rising portions by a single bent portion, and no other bent portions are formed except for the seam portion. Normally, the more bent portions there are, the stronger the folded plate becomes, but in the conventional technology, the fewer bent portions there are, the lower the strength becomes.

[0006] To prevent deformation and damage to folded-plate roofs due to strong winds, etc., it is necessary to increase the strength of the folded plates used as roofing materials. However, if many bent portions are carelessly formed in the folded plates, problems such as an increase in the number of forming processes in the roll forming machine, a decrease in dimensional accuracy, and an increase in manufacturing costs occur.

[0007] One aspect of the present invention has been made in consideration of the above problems, and has an object to provide a roofing material that can be easily formed while increasing the strength of the roofing material. [Means for solving the problem]

[0008] In order to solve the above problem, a roofing material in one embodiment of the present disclosure comprises a pair of seam fastening portions located at both ends in the working width direction, a bottom portion located between the pair of seam fastening portions, and a pair of inclined portions extending at an angle between the pair of seam fastening portions and the bottom portion, and the inclined portions include a fitting portion that fits into a tight frame, a first inclined portion connected to the fitting portion and extending at an angle, a second inclined portion located closer to the bottom than the first inclined portion and extending at an angle, a first folded surface portion whose connection with the first inclined portion is a valley fold when viewed from above and whose connection with the second inclined portion is a mountain fold when viewed from above, a third inclined portion extending at an angle, a fourth inclined portion connected to the bottom and extending at an angle, and a second folded surface portion whose connection with the third inclined portion is a valley fold when viewed from above and whose connection with the fourth inclined portion is a mountain fold when viewed from above.

[0009] According to the above configuration, since two folded portions, that is, the first folded surface portion and the second folded surface portion, are provided, the strength of the folded plate can be improved. The first folded surface portion may be located closer to the mating portion than the center between the lower end of the mating portion and the bottom portion in the height direction, and the second folded surface portion may be located closer to the bottom portion than the center between the lower end of the mating portion and the bottom portion in the height direction. When the space between the lower end of the fitting portion and the bottom portion is divided into three equal parts in the height direction into an upper section located on the fitting portion side, a central section, and a lower section located on the bottom side, the first folded surface portion may be located in the upper section, and the second folded surface portion may be located in the lower section.

[0010] According to the above configuration, by forming the first folded surface portion close to the fitting portion, it is possible to make it difficult for the angle between the fitting portion and the first inclined portion to deform. Also, by forming the second folded surface portion close to the bottom, it is possible to make it difficult for the angle between the bottom and the fourth inclined portion to deform. This makes it easier to maintain the shape of the entire folded plate when subjected to negative pressure loads such as strong winds, and makes it difficult for the fitting with the tight frame to come off. The first folded surface portion and the second folded surface portion may each have a length of 1 cm or more. The first folded surface portion and the second folded surface portion may be inclined so that liquid flows toward the bottom portion. According to the above configuration, rainwater or the like that has accumulated on the first folded surface portion and the second folded surface portion can be guided to the bottom portion. An angle of the first folded surface portion relative to the first inclined portion and an angle of the first folded surface portion relative to the second inclined portion may be equal to or greater than an angle of the first folded surface portion relative to the bottom portion.

[0011] According to the above configuration, the angle is less likely to deform when subjected to negative pressure, and the shapes of the first folded surface portion and the first and second inclined portions can be easily maintained. The first and second inclined portions may be parallel to each other.

[0012] According to the above configuration, in the folding plate forming process using a roll forming machine, it is easy to manage roll adjustments and the like, and folding plates can be manufactured cheaply and easily. In addition, when subjected to negative pressure loads such as strong winds, by aligning the angles of each part, stress is easily transmitted uniformly and continuously, and the strength of the folding plate can be stabilized. In addition, by aligning the angles of the inclined parts, the aesthetic appearance of the folding plate can be improved. The first folded surface portion and the second folded surface portion may be parallel to each other.

[0013] According to the above configuration, in the folding plate forming process using a roll forming machine, it is easy to manage roll adjustments and the like, and folding plates can be manufactured cheaply and easily. In addition, when subjected to negative pressure loads such as strong winds, by aligning the angles of each part, stress is easily transmitted uniformly and continuously, and the strength of the folding plate can be stabilized. In addition, by aligning the angles of the inclined parts, the aesthetic appearance of the folding plate can be improved. The second inclined portion and the third inclined portion may be parallel to and directly connected to each other. [Effects of the Invention]

[0014] According to one aspect of the present invention, it is possible to provide a roofing material that is easily moldable while increasing the strength of the roofing material. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a front view showing an example of the appearance of a roof structure according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an example of a perspective view of the folded plate shown in FIG. 1. [Figure 3] FIG. 2 is an example of a front view of the folded plate shown in FIG. 1. [Figure 4] 2 is a diagram illustrating a first folded surface portion and a second folded surface portion shown in FIG. 1. FIG. [Figure 5] FIG. 2 is a diagram illustrating the angles of each part of the folded plate shown in FIG. 1. [Figure 6] 2 is a diagram illustrating the angle of the first folded surface portion shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Embodiment 1] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, an example of a roof structure 1 will be described in which folded plates 2 used as roof materials are connected by seam fastening and fitting, the folded plates 2 are attached to a tight frame 3, and the tight frame 3 is then fixed to a roof substrate such as a beam 4.

[0017] However, the present invention is not limited to this, and can be applied to various types of roofing materials, such as overlapping folded plate roofing materials in which folded plates are fixed to a tight frame with fastening members such as nuts and bolts, snap-fastening folded plate roofing materials in which folded plates are fixed to a tight frame via retaining clips, and cap-fitting folded plate roofing materials in which folded plates are fixed by covering the connecting portions with caps.

[0018] <Roof structure> FIG. 1 is a front view showing an example of the appearance of a roof structure 1 according to a first embodiment of the present invention. As shown in FIG. 1, the roof structure 1 is a metal roof structure including a plurality of interconnected folded plates 2 and a tight frame 3. The folded plate 2 is formed, for example, by bending a single steel plate having a thickness of approximately 0.6 mm to 1.0 mm using a roll forming machine or the like. The folded plate 2 has high bending rigidity and is stronger than a single steel plate used as is, and is therefore suitable for use as a roofing material for large buildings such as factories, warehouses, and gymnasiums. Furthermore, in recent years, damage caused by strong winds such as typhoons has been increasing, and therefore there is a strong demand for a roof structure 1 with high wind pressure resistance.

[0019] As shown in Fig. 1, the folded plate 2 has a pair of top portions 21, a bottom portion 22, a pair of inclined portions 23, a pair of fitting portions 24, and a pair of fastening portions 26. The folded plate 2 is installed on a beam 4 via a tight frame 3. Details of the folded plate 2 will be described later.

[0020] The tight frame 3 is attached to the upper surface of the roof substrate, such as the beams 4, by fastening means such as welding or bolts. The tight frame 3 has peaks 31 and valleys 32 formed continuously to follow the shape of the folded plate 2, and is equipped with connecting portions 33 consisting of inclined surfaces that connect the peaks 31 and valleys 32.

[0021] The tight frame 3 is provided with a pair of fitting jaws 34 at the upper part of the connecting portion 33, which are fitted with the fitting portions 24 of the folded plate 2 to attach the folded plate 2. The tight frame 3 also has protrusions 35 that are fastened together with the folded plate 2 and adjacent folded plates 2A at the seam fastening portion 26.

[0022] In this way, the folded plates 2, 2A and the tight frame 3 are joined at the fitting portions 24 and the seam fastening portions 26, so that the roof structural body 1 can obtain high joint strength.

[0023] In the first embodiment, the belt-shaped tight frame 3 is described, in which the peaks 31 and valleys 32 are continuously formed. However, the invention is not limited to this, and the tight frame 3 may be a tight frame having one peak 31 and a pair of connecting portions 33 on both sides of the peak 31, thereby forming a pair of beam fixing portions. In this case, a plurality of tight frames may be attached to the beam 4 in a line. The beams 4 are roof underlayment made of steel frames or the like, and the tight frame 3 is attached to the top surface by welding or bolts. Multiple beams 4 are arranged in a direction (the direction toward the roof apex, hereinafter referred to as the "depth direction") perpendicular to the working width W (shown in Figure 3) of the folded plates 2. This prevents deformation or damage to the folded plates 2 along the depth direction. The working width refers to the width of the actually usable portion of the width of the folded plates 2, excluding the portion that overlaps with adjacent folded plates 2A. In other words, the working width indicates the width per folded plate 2 in the roof structure 1 in the direction in which the multiple folded plates 2 are combined. <Folded plate> Fig. 2 is an example of a perspective view of the folding plate 2, and Fig. 3 is an example of a front view of the folding plate 2. The folding plate 2 of the first embodiment will be described in detail with reference to Figs.

[0024] 2 and 3, the folded plate 2 is formed by bending a single steel plate. The folded plate 2 has a pair of top portions 21a, 21b, a bottom portion 22, a pair of seam portions 26a, 26b, and a pair of inclined portions 23a, 23b. The pair of inclined portions 23a, 23b has a pair of fitting portions 24a, 24b.

[0025] In this specification, when a pair of members such as a pair of apexes 21 or a pair of inclined portions 23 are to be distinguished from one another, they are written with an a or b, for example, as apexes 21a and 21b. When they are to be described collectively without being distinguished from one another, they are written without an a or b, for example, as apex 21.

[0026] The pair of seam fastening portions 26a, 26b are located at both ends of the folding plate 2 in the working width W direction and are formed on the pair of apexes 21a, 21b, respectively. The bottom portion 22 is formed in a valley shape between the seam fastening portions 26a, 26b.

[0027] The seam fastening portions 26a formed on the folding plate 2, the seam fastening portions 26b formed on the adjacent folding plates 2A, and the protrusions 35 of the tight frame 3 are seam fastened to one another. This forms the roof structure 1 having tops 21 and bottoms 22 alternately and continuously.

[0028] The pair of inclined portions 23a, 23b are formed so as to extend obliquely between the bottom portion 22 and the fastening portions 26a, 26b, respectively.

[0029] The pair of fitting portions 24a, 24b protrude in a direction approaching each other (towards the bottom portion 22), and fit into a pair of fitting jaw portions 34 formed on the tight frame 3, respectively.

[0030] A recess 22a is formed in the approximate center of the bottom 22 of the folding plate 2. The recess 22a functions as a rib and is formed to reinforce the folding plate 2.

[0031] Furthermore, if the length of the bottom portion 22 expands due to heat, the bottom portion 22 will bulge upward or downward and deform by the expanded length. In this case, if the recesses 22a are formed, the direction in which the bottom portion 22 bulges can be guided downward, which is the same direction as the bulging direction of the recesses 22a. Therefore, the deformation direction of the bottom portion 22 can be controlled, and each bottom portion 22 can be prevented from deforming in an arbitrary direction. The pair of inclined portions 23a, 23b includes a pair of first inclined portions 51a, 51b, a pair of second inclined portions 52a, 52b, a pair of third inclined portions 53a, 53b, and a pair of fourth inclined portions 54a, 54b in addition to the pair of fitting portions 24. The pair of inclined portions 23a, 23b further includes a pair of first folded surface portions 55a, 55b, a pair of second folded surface portions 56a, 56b, and a pair of fitting portion lower ends 25a, 25b.

[0032] <Folding section> Generally, the more bent portions there are, the more the bending rigidity and strength of the folded plate 2 are improved. The folded plate 2 of this embodiment has two bent portions, the first folded surface portion 55 and the second folded surface portion 56, thereby improving the strength of the folded plate 2.

[0033] FIG. 4 is a diagram illustrating a first folded surface portion 55 and a second folded surface portion 56 provided on the inclined portion 23 of the folded plate 2, and FIG. 5 is a diagram illustrating the angles of each portion of the folded plate 2.

[0034] The folded plates 2 are formed to be substantially symmetrical with each other except for a pair of seam fastening portions 26. For convenience of explanation, the following will describe the inclined portion 23a on the left side of the folded plate 2 shown in Fig. 3. Unless otherwise specified, the inclined portion 23b on the right side of the folded plate 2 is configured to be substantially symmetrical with the inclined portion 23a on the left side.

[0035] As shown in FIGS. 4 and 5, the inclined portion 23 includes a first inclined portion 51, a second inclined portion 52, a third inclined portion 53, a fourth inclined portion 54, a first folded surface portion 55, and a second folded surface portion 56.

[0036] The first inclined portion 51 has one end connected to the fitting portion 24 at the fitting portion lower end 25 and extends continuously from the fitting portion 24 .

[0037] The second inclined portion 52 is located closer to the bottom 22 side than the first inclined portion 51 and extends at an angle.

[0038] The third inclined portion 53 is located closer to the bottom 22 than the second inclined portion 52 and extends at an incline. In this embodiment, the third inclined portion 53 is formed parallel to the second inclined portion 52 and directly connected to it. In other words, the third inclined portion 53 is substantially the same portion as the second inclined portion 52. However, this is not limiting, and a configuration in which a third folded surface portion is provided between the second inclined portion 52 and the third inclined portion 53 may also be used.

[0039] The fourth inclined portion 54 has one end connected to the bottom portion 22 and extends continuously from the bottom portion 22 .

[0040] The fitting portion lower end 25 is the lower end of the fitting portion 24, and connects the fitting portion 24 and the first inclined portion 51. As will be described in detail later, when the folded plate 2 is subjected to a negative pressure load due to strong winds, the stress can be transmitted to the fitting portion lower end 25. This prevents the fitting portion lower end 25 from biting into the fitting jaw portion 34 of the tight frame 3, causing the fitting between the folded plate 2 and the tight frame 3 to come loose.

[0041] The first folded surface portion 55 is formed between the first inclined portion 51 and the second inclined portion 52. When viewed from above, the connection portion of the first folded surface portion 55 with the first inclined portion 51 is formed as a valley fold (X1), and the connection portion with the second inclined portion 52 is formed as a mountain fold (Y1). In other words, the first folded surface portion 55 has folded portions X1 and Y1 at both ends, and the width L1 of the first folded surface portion 55 (the length between the folded portions X1 and Y1) is formed to be approximately 1 cm to 3 cm. The width L1 of the first folded surface portion 55 may be 1 cm or more.

[0042] The second folded surface portion 56 is formed between the third inclined portion 53 and the fourth inclined portion 54. When viewed from above, the connection portion of the second folded surface portion 56 with the third inclined portion 53 is formed as a valley fold (X2), and the connection portion with the fourth inclined portion 54 is formed as a mountain fold (Y2). In other words, the second folded surface portion 56 has bent portions X2 and Y2 at both ends, and the width L2 of the second folded surface portion 56 (the length between the bent portions X2 and Y2) is formed to be approximately 1 cm to 3 cm. The width L2 of the second folded surface portion 56 may be 1 cm or more.

[0043] In addition, the first folded surface portion 55 and the second folded surface portion 56 are inclined so that liquid flows toward the bottom 22 side, and rainwater and the like that accumulates in the first folded surface portion 55 and the second folded surface portion 56 can be guided to the bottom 22.

[0044] (position) As shown in FIG. 4, when the space between the lower end 25 of the fitting portion and the bottom 22 is divided into two equal parts in the height direction into an upper part H1 that is closer to the fitting portion 24 than the center and a lower part H2 that is closer to the bottom 22 than the center, the first folded surface part 55 is located in the upper part H1 and the second folded surface part 56 is located in the lower part H2.

[0045] Furthermore, when the distance between fitting portion lower end 25 and bottom portion 22 is divided into three equal sections in the height direction, namely, an upper section P1 on the fitting portion 24 side, a central section P2, and a lower section P3 on the bottom 22 side, it is more preferable that first folded surface portion 55 is formed to be located in upper section P1. Second folded surface portion 56 is formed to be located in lower section P3.

[0046] In this way, by forming the first folded surface portion 55 in a position close to the fitting portion 24, it is possible to make it difficult for the angle between the fitting portion 24 and the first inclined portion 51 to deform. Also, by forming the second folded surface portion 56 in a position close to the bottom portion 22, it is possible to make it difficult for the angle between the bottom portion 22 and the fourth inclined portion 54 to deform. Also, this makes it easier to maintain the shape of the entire folded plate 2 when subjected to a negative pressure load such as a strong wind, and makes it difficult for the fitting with the tight frame 3 to come off.

[0047] (tilt angle) 5, the inclination angles relative to the horizontal line are θ1 for first inclined portion 51, θ2 for third inclined portion 53, and θ3 for fourth inclined portion 54. In this case, the inclination angles θ1, θ2, and θ3 are all formed to be approximately 45 to 55 degrees, more preferably approximately 50 to 53 degrees. In other words, the inclination angles θ1, θ2, and θ3 are approximately the same, and the first inclined portion 51, third inclined portion 53, and fourth inclined portion 54 are formed to be approximately parallel to one another.

[0048] The inclination angles of first folded surface portion 55 and second folded surface portion 56 relative to the horizontal line are θ5 for first folded surface portion 55 and θ6 for second folded surface portion 56. In this case, the inclination angles θ5 and θ6 are both formed to be approximately 18 degrees to 25 degrees, more preferably approximately 21 degrees to 23 degrees. In other words, the inclination angles θ5 and θ6 are approximately the same, and first folded surface portion 55 and second folded surface portion 56 are formed to be approximately parallel to each other.

[0049] In this way, the folded plate 2 is formed so that the first inclined portion 51, the third inclined portion 53, and the fourth inclined portion 54 are approximately parallel to each other, and the first folded surface portion 55 and the second folded surface portion 56 are approximately parallel to each other.

[0050] This facilitates roll adjustment and other management during the forming process of the folded plate 2 using a roll forming machine, allowing for inexpensive and easy production of the folded plate 2. Furthermore, as will be described in detail later, when subjected to a negative pressure load (force from below) such as strong winds, aligning the angles of each portion makes it easier for stress to be uniform from the inclined portion 23 to the lower end 25 of the mating portion. Furthermore, the force applied to the bottom portion 22 from below is more easily transmitted to the lower end 25 of the mating portion along the extension direction of the first inclined portion 51, the second inclined portion 52, the third inclined portion 53, and the fourth inclined portion 54. This prevents deformation (bending) of the inclined portion 23. Furthermore, this applies a force to the lower end 25 of the mating portion in a direction along the first inclined portion 51. This force acts in a direction that causes the lower end 25 of the mating portion to bite into the underside of the mating jaw 34. This makes it less likely for the mating portion 24 to come off the mating jaw 34 due to a negative pressure load.

[0051] In addition, by aligning the angles of each part of the inclined portion 23, the aesthetic appearance of the folded plate 2 can be improved.

[0052] As described above, the inclination angles θ5 and θ6 are formed to be approximately 20 to 25 degrees, and the inclination angles θ1, θ2, and θ3 are formed to be approximately 45 to 55 degrees. Thus, the inclination angles θ5 and θ6 of the first folded surface portion 55 and the second folded surface portion 56 are approximately half the inclination angles θ1, θ2, and θ3 of the first inclined portion 51, the third inclined portion 53, and the fourth inclined portion 54. In other words, the first folded surface portion 55 and the second folded surface portion 56 are formed to be more gently inclined than the first inclined portion 51, the third inclined portion 53, and the fourth inclined portion 54.

[0053] When the folding plate 2 has the first folding surface portion 55 and the second folding surface portion 56, the first folding surface portion 55 diagonally connects the first inclined portion 51 and the second inclined portion 52, and the second folding surface portion 56 diagonally connects the third inclined portion 53 and the fourth inclined portion 54. Therefore, if the specifications such as the working width do not change, the dimensions of the rigid plate required to form the inclined portion 23 and the bottom portion 22 can be shortened compared to when the first folding surface portion 55 and the second folding surface portion 56 are not provided.

[0054] Generally, the width of commercially available steel plates is fixed, so when the required dimension is shortened, there is a margin in the width direction of the steel plate. This margin in the dimension of the steel plate can be used, for example, to increase the height of the folded plate 2 (the length from the underside of the bottom portion 22 to the upper surface of the top portion 21).

[0055] Normally, as the height of the folded plate 2 increases, the moment of inertia increases, improving the rigidity (cross-sectional performance). For this reason, by providing the first folded surface portion 55 and the second folded surface portion 56, the height of the folded plate 2 can be increased by using the excess steel plate, further increasing the strength of the folded plate 2.

[0056] To achieve the above effect, the inclination angles θ5 and θ6 of the first folded surface portion 55 and the second folded surface portion 56 are set to approximately half the inclination angles θ1, θ2, and θ3 of the first inclined portion 51, the third inclined portion 53, and the fourth inclined portion 54. In addition, the widths L1 and L2 of the first folded surface portion 55 and the second folded surface portion 56 are set to approximately 1 cm to 3 cm.

[0057] This allows the width of commercially available steel plates to be distributed efficiently and effectively, while increasing the height of the ridges and increasing the strength of the folded plate 2, and the strength of the inclined portion 23 can be increased by the first folded surface portion 55 and the second folded surface portion 56.

[0058] In this way, by providing the first folded surface portion 55 and the second folded surface portion 56, it is possible to produce a folded plate 2 that is easy to form, has high wind pressure resistance, and is strong.

[0059] (bottom end of fitting) When the folded plate 2 is subjected to a negative pressure load (force from below) such as a strong wind, the bottom 22 and the inclined portion 23 below the lower end 25 of the fitting portion bulge outward (upward) from the building due to the wind pressure, making the folded plate 2 more likely to come off the fitting jaw portion 34 of the tight frame 3.

[0060] As described above, in the folded plate 2, the first folded surface portion 55 is located close to the fitting portion 24, so the angle between the fitting portion 24 and the first inclined portion 51 is less likely to deform. In addition, the second folded surface portion 56 is located close to the bottom portion 22, so the angle between the bottom portion 22 and the fourth inclined portion 54 is less likely to deform. This makes it easier to maintain the overall shape of the inclined portion 23 of the folded plate 2.

[0061] Therefore, even if the folding plate 2 receives a force pushing up the bottom 22 from below due to negative pressure, the bottom 22 and the inclined portion 23 below the lower end 25 of the fitting portion are prevented from deforming and bulging outward, making it easier to maintain the overall shape.

[0062] As a result, the force due to the negative pressure load is transmitted to the lower end 25 of the fitting portion via the bottom 22 and the inclined portion 23 below the lower end 25 of the fitting portion, and the lower end 25 of the fitting portion that receives the force bites into the underside of the fitting jaw portion 34 of the tight frame 3.

[0063] This actually strengthens the connection between the lower end 25 of the fitting portion and the fitting jaw portion 34 of the tight frame 3, making it possible to prevent the fitting between the folding plate 2 and the tight frame 3 from coming loose.

[0064] (Folded surface part and inclined part) 6 is a diagram illustrating the angle of the first folded surface portion 55. As shown in Fig. 6, the angle θ21 of the first folded surface portion 55 with respect to the first inclined portion 51 and the angle θ22 of the first folded surface portion 55 with respect to the second inclined portion 52 may be equal to or greater than the angle θ23 of the first folded surface portion 55 with respect to an imaginary line Q1 parallel to the bottom portion 22. The relationship between the second folded surface portion 56, the third inclined portion 53, and the fourth inclined portion 54 may be similar.

[0065] This makes it difficult for the angles θ21 and θ22 to deform when subjected to negative pressure, and makes it easier to maintain the shapes of the first folded surface portion 55 and the first and second inclined portions 51 and 52. This makes it easier to maintain the shape of the entire inclined portion 23, and prevents the fitting between the folded plate 2 and the tight frame 3 from coming loose.

[0066] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0067] 2. Folded plate (roofing material) 3 Tight Frame 22 Bottom 23 Slope 24 Fitting part 25 Lower end of mating 26 Seam fastening part 51 1st slope section 52 2nd slope section 53 Third slope section 54 4th slope section 55 1st folding surface 56 2nd folding surface P1 Upper section P2 Central section P3 Lower Section

Claims

1. A pair of seam fastening portions located at both ends in the working width direction; a bottom portion located between the pair of fastening portions; a pair of inclined portions extending obliquely between the pair of fastening portions and the bottom portion, The inclined portion is a fitting portion that fits into the tight frame; a first inclined portion connected to the fitting portion and extending at an incline; a second inclined portion located closer to the bottom than the first inclined portion and extending at an angle; a first folded surface portion in which a connecting portion with the first inclined portion is a valley fold when viewed from above, and a connecting portion with the second inclined portion is a mountain fold when viewed from above; a third inclined portion extending obliquely; a fourth inclined portion connected to the bottom portion and extending at an incline; a second folded surface portion having a connecting portion with the third inclined portion that is a valley fold when viewed from above, and a connecting portion with the fourth inclined portion that is a mountain fold when viewed from above; Including, When the space between the lower end of the fitting portion and the bottom portion is divided into three equal parts in the height direction into an upper section located on the fitting portion side, a central section, and a lower section located on the bottom side, the first folded surface portion is located in the upper section, The roofing material, wherein the second folded surface portion is located in the lower section.

2. A pair of seam fastening portions located at both ends in the working width direction; a bottom portion located between the pair of fastening portions; a pair of inclined portions extending obliquely between the pair of fastening portions and the bottom portion, The inclined portion is a fitting portion that fits into the tight frame; a first inclined portion connected to the fitting portion and extending at an incline; a second inclined portion located closer to the bottom than the first inclined portion and extending at an angle; a first folded surface portion in which a connecting portion with the first inclined portion is a valley fold when viewed from above, and a connecting portion with the second inclined portion is a mountain fold when viewed from above; a third inclined portion extending obliquely; a fourth inclined portion connected to the bottom portion and extending at an incline; a second folded surface portion having a connecting portion with the third inclined portion that is a valley fold when viewed from above, and a connecting portion with the fourth inclined portion that is a mountain fold when viewed from above; Including, The roofing material, wherein the angle of the first folded surface portion relative to the first inclined portion and the angle of the first folded surface portion relative to the second inclined portion are equal to or greater than the angle of the first folded surface portion relative to the bottom portion.

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