Tight frame and method for constructing roof structure

Abstract

To provide a roof material which can be easily constructed while increasing the strength of the roof material.SOLUTION: The tight frame (3) includes a pair of inclined surfaces (33), a top part (31), a fitting jaw part (34), a projection part (35), and a first locking part (361), and the projection part is formed by cutting and raising a part of a plate member forming the top part.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present invention relates to a roofing material, a tight frame, a roof structure, and a method for constructing a roof structure. [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 roof structure including a pair of retaining clip members, a tight frame, and a retaining clip member, each of which has a pair of engaging edges with a substantially triangular cross section. The retaining clip member has an upright portion formed on the upper surface of the retaining clip member and a pair of hook-shaped engaging portions. During construction, the folded plates are positioned so that the engaging edges of the plates to be joined together are positioned above the engaging portions, and the plates are joined together and attached to the tight frame by being stepped on from above. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-183487 Summary of the Invention [Problem to be solved by the invention]

[0005] In the prior art described above, the engaging edge of one of the folding plates (hereinafter referred to as "one engaging edge") is formed in a similar shape to but smaller than the engaging edge of the other folding plate (hereinafter referred to as "the other engaging edge"). Furthermore, openings are formed in the lower parts of the one engaging edge and the other engaging edge for inserting and fitting the joining members. As described above, by stepping on the folding plate during construction, the locking portion of the tight frame is inserted and fitted into the opening of one of the folding plates, and the one engaging edge is inserted and fitted into the opening of the other folding plate. In this way, the folding plates are attached to the tight frame in a joined state.

[0006] However, in the above-mentioned configuration, one engaging edge is elastically deformed in order to insert the other engaging edge into the other engaging edge. Therefore, it is considered that such fitting by stepping on is not easy. Furthermore, since the tight frames are arranged at a predetermined interval on the beam, if they are stepped on in a place where no tight frames are arranged, the lower folded plate will bend downward, making it difficult to join. As such, the roof structure of the conventional technology has the problem of poor workability.

[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 installed while increasing the strength of the roofing material. [Means for solving the problem]

[0008] In order to solve the above problems, a tight frame in one embodiment of the present disclosure comprises a pair of inclined surfaces, a top portion located between the pair of inclined surfaces, a pair of engaging jaw portions provided on the pair of inclined surfaces and engaging with two roof materials, a protrusion formed protruding from the top portion and holding the two roof materials when fastened together with the two roof materials, and a first hooking portion protruding from the protrusion portion, wherein the protrusion portion is formed by cutting out a portion of the plate member forming the top portion.

[0009] According to the above-mentioned configuration, the folded plate can be firmly joined directly to the tight frame without using retaining clips, thereby improving the joining strength. Furthermore, since no retaining clips are used, costs can be reduced, the effort required for attaching retaining clips can be eliminated, and workability can be improved.

[0010] Furthermore, by forming the protrusions by cutting and raising a part of the tight frame, it is possible to achieve roughly the same thickness as the tight frame and provide the same rigidity as the tight frame. This also reduces the number of parts and manufacturing processes, cutting costs, and ensuring a certain level of joint strength compared to attachment using welding or fastening members.

[0011] The protrusion may restrain movement of a bottom seam formed at one end of the roofing material by engaging at least a portion of the bottom seam.

[0012] According to the above configuration, even if the folded plates are stepped on, the positions of the folded plates do not shift and they can be easily fitted together.

[0013] The protrusion may further include a second hook portion that protrudes from the protrusion in a direction different from that of the first hook portion.

[0014] According to the above configuration, the folded plate can be directly and firmly joined to the tight frame.

[0015] In order to solve the above problems, a construction method for a roof structure according to one aspect of the present disclosure is a construction method for a roof structure for attaching folded plates to a tight frame, the construction method including: a bottom seam positioning step for hooking and holding a bottom seam formed on a first folded plate onto a protrusion formed on the top of the tight frame; a fitting portion fitting step for pressing the bottom of the first folded plate from above downward so that a fitting protrusion of the first folded plate fits into a fitting jaw of the tight frame and the bottom seam fits into the protrusion; an upper seam positioning step for positioning a second folded plate adjacent to the first folded plate so that the upper seam of the second folded plate covers the lower seam; and a seam fastening step for seam fastening the upper seam together with the bottom seam and the protrusion. [Effects of the Invention]

[0016] According to one aspect of the present invention, it is possible to provide a roofing material that can be easily installed while increasing the strength of the roofing material. [Brief explanation of the drawings]

[0017] [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 front view of the folded plate shown in FIG. 1. [Figure 3] FIG. 3 is an example of a perspective view of the folded plate shown in FIG. 2. [Figure 4] FIG. 3 is an example of a front view of the upper seam of the folded plate shown in FIG. 2. [Figure 5] FIG. 3 is an example of a front view of the bottom seam of the folded plate shown in FIG. 2. [Figure 6] FIG. 2 is a front view of the tight frame shown in FIG. 1. [Figure 7] FIG. 7 is a plan view of an example of the tight frame shown in FIG. 6. [Figure 8] FIG. 7 is an example of a side view of the tight frame shown in FIG. 6. [Figure 9] FIG. 7 is a perspective view of the tight frame shown in FIG. 6. [Figure 10] FIG. 7 is a perspective view of another example of the tight frame shown in FIG. 6. [Figure 11] FIG. 2 is a diagram showing the state in which the folded plate shown in FIG. 1 is attached to a tight frame. [Figure 12] 2 is a diagram illustrating a method for joining the folded plate and the tight frame shown in FIG. 1. FIG. [Figure 13] 12 is an enlarged view showing an example of the fastening portion shown in FIG. 11. FIG. [Figure 14] FIG. 10 is an example of a front view of a tight frame according to a second embodiment of the present invention. [Figure 15] FIG. 15 is a plan view of an example of the tight frame shown in FIG. 14. [Figure 16] FIG. 15 is a perspective view of the tight frame shown in FIG. 14. [Figure 17] FIG. 15 is a perspective view of another example of the tight frame shown in FIG. 14. DETAILED DESCRIPTION OF THE INVENTION

[0018] [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 fixed to a roof substrate such as a beam 4.

[0019] <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, making it suitable for use as a roofing material for large buildings such as factories, warehouses, and gymnasiums. Furthermore, damage caused by strong winds such as typhoons has been increasing in recent years, so there is a strong demand for a roof structure 1 with high wind pressure resistance.

[0020] As shown in Figure 1, the folded plate 2 has a top portion 21, a bottom portion 22, a pair of inclined portions 23, a pair of fitting portions 24, and a seam fastening portion 25. At the seam fastening portion 25, the folded plate 2, adjacent folded plates 2A, and protrusions 35 of the tight frame 3 described below are joined by seam fastening. As a result, the roof structure 1 has mountain-shaped top portions 21 and valley-shaped bottom portions 22 alternately arranged in succession.

[0021] Between the two top portions 21 and bottom portions 22 of the folded plate 2, a pair of inclined portions 23 are formed, which connect the top portion 21 and the bottom portion 22 and continue from the top portion 21 and the bottom portion 22.

[0022] A pair of fitting portions 24 that fit with the tight frame 3 are formed between the seam fastening portion 25 and the inclined portion 23. The fitting portions 24 have fitting protrusions 241 that fit with fitting jaw portions 34 formed on the tight frame 3.

[0023] Furthermore, to prevent condensation, a thin heat insulating sheet (not shown) may be attached to the back (lower side) of the folded plate 2. The heat insulating sheet may have a thickness of, for example, about 4.0 mm, and may be attached to the back side of the steel plate with an adhesive or the like before the steel plate is folded and formed. The heat insulating sheet is made of, for example, resin.

[0024] The folded plate 2 is installed on the beams 4 via the tight frames 3. The tight frames 3 are attached to the upper surface of the roof substrate such as the beams 4 by fastening means such as welding or bolts. The tight frames 3 are formed with a continuous peak (top) 31 and a valley 32 so as to follow the shape of the folded plate 2, and are equipped with a connecting portion (inclined surface) 33 consisting of an inclined surface that connects the peak 31 and the valley 32.

[0025] As described above, the tight frame 3 is provided with a fitting jaw portion 34 at the upper part of the connecting portion 33, which fits into the fitting portion 24 of the folded plate 2 to attach the folded plate 2. The fitting jaw portion 34 is configured as a pair and includes fitting jaw portions 34a and 34b.

[0026] The tight frame 3 also has protrusions 35 that are connected together with the folding plates 2, 2A by the seam fastening portions 25. Details of the fitting of the folding plates 2, 2A with the tight frame 3 and the protrusions 35 will be described later.

[0027] 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.

[0028] 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 (toward the roof apex, hereinafter referred to as the "depth direction") perpendicular to the direction of the working width W (shown in Figure 2) 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 2. 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.

[0029] <Folded plate> 2 is an example of a front view of the folded plate 2, FIG. 3 is an example of a perspective view of the folded plate 2, FIG. 4 is an example of a front view of the upper seam 26 of the folded plate 2, and FIG. 5 is an example of a front view of the lower seam 27 of the folded plate 2. The folded plate 2 of the first embodiment will be described in detail based on FIGS. 2 to 5.

[0030] 2 and 3, the folded plate 2 is formed by bending a single steel plate. The folded plate 2 has a pair of mountain-shaped peaks 21a and 21b at both ends in the direction of the working width W, and a valley-shaped bottom 22 at approximately the center of the folded plate 2.

[0031] Furthermore, a pair of inclined portions 23a, 23b are formed between the tops 21a, 21b and the bottom 22, respectively, connecting the tops 21a, 21b and the bottom 22. The inclined portions 23a, 23b are formed so as to be continuous with the tops 21a, 21b and the bottom 22, respectively.

[0032] An upper seam 26 is formed on the top portion 21a, and a lower seam 27 is formed on the top portion 21b. The upper seam 26 of the folded plate 2 engages with the lower seam 27 formed on the adjacent folded plate 2A and the protrusion 35 of the tight frame 3, and the folded plate 2 is firmly joined to the adjacent folded plate 2A and tight frame 3 by being fastened.

[0033] In this way, by joining the folded plates 2, 2A and the protrusions 35 by seaming, a roof structure 1 is formed in which a plurality of tops 21 and a plurality of bottoms 22 are formed alternately and continuously, as shown in Figure 1.

[0034] The folding plate 2 also has a fitting protrusion 241a at the fitting portion 24a located between the upper seam 26 and the inclined portion 23a, which fits with the fitting jaw portion 34a of the tight frame 3. The fitting portion 24b located between the lower seam 27 and the inclined portion 23b also has a fitting protrusion 241b that fits with the fitting jaw portion 34b. The fitting protrusion 241a and the fitting protrusion 241b are configured as a pair.

[0035] 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.

[0036] 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.

[0037] (Upper and lower edges) As described above, an upper seam 26 is formed on the top 21a of the folding plate 2, and a lower seam 27 is formed on the top 21b. The upper seam 26 of the folding plate 2 engages with the lower seam 27 formed on the adjacent folding plate 2A and the protrusion 35 of the tight frame 3, and the folding plate 2 is connected to the folding plate 2A by being fastened.

[0038] As shown in Figures 2 and 3, before being fastened, the opening on the lower side of the upper seam 26 is open enough to allow the lower seam 27 to be freely inserted. As shown in Figure 4, after being fastened, the opening on the lower side of the upper seam 26 is closed (narrowed) enough to prevent the lower seam 27 from slipping out. As shown in Figures 4 and 5, the upper seam 26 and the lower seam 27 are formed to have different shapes. Specifically, for example, after being fastened, the upper seam 26 has a substantially trapezoidal outer shape, and the lower seam 27 has a substantially triangular outer shape.

[0039] (Upper lip) 4, the upper seam 26 has a pair of arc-shaped corners 263a, 263b on its upper surface. An opening 264 is formed at the bottom of the upper seam 26, into which the lower seam 27 and the protrusion 35 of the tight frame 3 are inserted during construction.

[0040] The upper seam 26 is formed with a pair of first and second bottom hooking portions 261 and 262 that are hooked onto hooking portions 36 (see FIG. 13) formed on the protrusions 35 of the tight frame 3. Note that "hooking" means to hook and fasten or to fix.

[0041] As shown in FIG. 13, the hooking portion 36 of the tight frame 3 includes a pair of a first hooking portion 361 and a second hooking portion 362.

[0042] The first bottom hooking portion 261 on the tip side of the upper seam 26 is hooked by the first hooking portion 361 of the tight frame 3, and the second bottom hooking portion 262 on the bottom 22 side of the upper seam 26 is hooked by the second hooking portion 362 of the tight frame 3. In this way, the upper seam 26 is joined to the tight frame 3.

[0043] Returning to FIG. 4, the first bottom hooking portion 261 and the second bottom hooking portion 262 are formed so that their vertical positions differ from each other after they are seamed. Specifically, after they are seamed, the first bottom hooking portion 261 is positioned a predetermined length (L) below the second bottom hooking portion 262. The predetermined length L corresponds, for example, to the thickness of the third bottom hooking portion 271 of the bottom seam 27. The second bottom hooking portion 262 is hooked by the second hooking portion 362 of the tight frame 3 (FIG. 13). In contrast, the first bottom hooking portion 261 is hooked by the first hooking portion 361 of the tight frame 3 via the third bottom hooking portion 271 of the bottom seam 27.

[0044] (Lower) 5, the bottom seam 27 has a substantially triangular outer shape and includes a pair of oblique sides 273a, 273b. An opening 274 is formed at the bottom, into which the protrusion 35 of the tight frame 3 is inserted during construction.

[0045] 13, the bottom seam 27 is formed with a third bottom hooking portion 271 that hooks onto the hooking portion 36 formed on the protrusion 35 of the tight frame 3. The bottom seam 27 is hooked onto the tight frame 3 in a manner different from that of the top seam 26.

[0046] Specifically, as described above, the first bottom hooking portion 261 of the upper seam 26 is hooked by the first hooking portion 361 of the tight frame 3, and the second bottom hooking portion 262 is hooked by the second hooking portion 362 of the tight frame 3.

[0047] On the other hand, as described above, the lower seam 27 has the third bottom hooking portion 271 hooked by the first hooking portion 361 of the tight frame 3, but unlike the upper seam 26, it does not have a portion that is hooked from below by the second hooking portion 362.

[0048] This allows the bottom seam 27 to have a large opening 274 for inserting the protrusion 35. Also, unlike the first bottom hooking portion 261 and the second bottom hooking portion 262 of the top seam 26, the bottom seam 27 does not have a neck portion 265 that clamps the protrusion 35 from both sides. Therefore, simply by hooking the bottom seam 27 onto the protrusion 35 of the tight frame 3 from above, the protrusion 35 can be fitted into the bottom seam 27 without applying a large force.

[0049] The lower seam 27 is formed in a generally triangular shape, tapering upward. Furthermore, since it does not have a neck portion 265, when the upper seam 26 is fitted to the lower seam 27 from above, it can be easily rotated around the tip of the protrusion 35, making it easier to fit the upper seam 26. This allows the generally triangular top of the lower seam 27 to be easily inserted into the opening 264 of the upper seam 26 and fitted together.

[0050] <Tight frame> Next, the tight frame 3 of the first embodiment will be described in detail.

[0051] Figure 6 is an example of a front view of the tight frame 3, Figure 7 is an example of a plan view of the tight frame 3, Figure 8 is an example of a side view of the tight frame 3, Figure 9 is an example of an oblique view of the tight frame 3 seen from above, and Figure 10 is another example of an oblique view of the tight frame 3 seen from below.

[0052] The tight frame 3 will be described in detail with reference to Figures 6 to 10. The tight frame 3 is formed from a single steel plate by bending the steel plate and cutting and raising a portion of the steel plate.

[0053] (Protrusions and latches) The tight frame 3 has a protrusion 35 that is connected together with the folded plates 2, 2A at the seam fastening portion 25. The protrusion 35 is formed by cutting out a part of the peak portion 31 of the tight frame 3 and protruding from the peak portion 31 (top portion) of the tight frame 3. The protrusion 35 holds the folded plates 2, 2A in the seam fastened state.

[0054] In this way, a part of the steel plate of the tight frame 3 is used to form the protrusion 35, and by fastening the protrusion 35 to the upper seam 26 and the lower seam 27, a retaining clip function is added to the tight frame 3 itself. The retaining clip function is the function of attaching the folded plate 2 to the tight frame 3 via the retaining clip. Note that the retaining clip requires a means of fastening to the tight frame, and the strength of the fastening means can limit the joining strength between the folded plate and the tight frame.

[0055] This allows the folded plate 2 to be firmly joined directly to the tight frame 3 without using retaining clips, improving the joining strength. In addition, because no retaining clips are used, costs can be reduced, the effort required to attach retaining clips can be eliminated, and workability can be improved.

[0056] The hook portion 36 of the protrusion 35 includes a first hook portion 361 that protrudes from the protrusion 35 in a predetermined direction, and a second hook portion 362 that protrudes from the protrusion 35 in a direction different from that of the first hook portion 361.

[0057] The first hooking portion 361 hooks the bottom seam 27 and the top seam 26 via the bottom seam 27. On the other hand, the second hooking portion 362 hooks the top seam 26 but does not hook the bottom seam 27 (see FIG. 13).

[0058] In the above example, the hook portion 36 includes the first hook portion 361 and the second hook portion 362, but this is not limiting and the hook portion 36 may include only one hook portion 36. Even with only one hook portion 36, high joining strength can be obtained by fastening together with the upper seam 26 and the lower seam 27.

[0059] This allows one hook portion 36 to be formed to protrude from the protrusion 35 in a required direction depending on the direction in which the roofing material is laid.

[0060] (Cut and Raise) The fitting jaw portion 34, protrusion portion 35, and hooking portion 36 of the tight frame 3 are integrally formed with the steel plate that constitutes the tight frame 3, and are formed, for example, by cutting out a portion of the steel plate that constitutes the tight frame 3 using louver processing, etc.

[0061] As a result, the fitting jaw portion 34, the protrusion portion 35, and the hook portion 36 have substantially the same plate thickness as the tight frame 3 having a predetermined rigidity, and can be provided with the same rigidity as the tight frame 3.

[0062] Furthermore, by configuring the fitting jaw portion 34, the protrusion portion 35, and the hook portion 36 from the steel plate that configures the tight frame 3, it is possible to reduce the number of parts and manufacturing processes, thereby reducing costs. This also makes it possible for the tight frame 3 of this embodiment to ensure higher joining strength compared to when the protrusion portion 35 and the hook portion 36 are attached to the tight frame by welding or fastening members.

[0063] <Fitting of folded plate and tight frame> FIG. 11 is a diagram showing the state in which the folded plate 2 is attached to the tight frame 3. The folded plate 2 and the tight frame 3 are firmly joined to each other by both the seam fastening portion 25 and the fitting portion 24. This improves the joining strength of the joint. Even if the fitting portion 24 comes loose due to negative pressure load during strong winds such as a typhoon, the joint between the folded plate 2 and the tight frame 3 by the seam fastening portion 25 remains, preventing the folded plate 2 from coming completely off the tight frame 3.

[0064] The fitting protrusion 241 of the folding plate 2 is formed slightly larger than the fitting jaw 34 so as to fit the shape of the fitting jaw 34 formed by protruding from the connecting portion 33 of the tight frame 3. This makes it possible to easily fit the fitting protrusion 241 of the folding plate 2 into the fitting jaw 34 of the tight frame 3.

[0065] Due to the configuration of the above-mentioned seam tightening portion 25 and fitting portion 24, the seam tightening portion 25 and the fitting portion 24 can be easily fitted together by the worker pressing the folding plates 2, 2A, etc. from above, for example by stepping on them, during construction, thereby improving construction efficiency.

[0066] <Construction method> 12 is a diagram illustrating a method for joining the folded plates 2, 2A to the tight frame 3. In the roof structural body 1 of the first embodiment, the work of attaching the folded plates 2 to the tight frame 3 can be easily performed during construction.

[0067] Specifically, as shown in Fig. 12, first, the worker hooks the bottom seam 27 of the folding plate 2 onto the protrusion 35 of the tight frame 3 to hold it in place (bottom seam placement step). The description will be given assuming that the top seam side (not shown) of the folding plate 2 is already seam fastened.

[0068] Next, the worker steps on the bottom 22 of the folding plate 2 from above to below, so that the fitting protrusion 241 of the folding plate 2 fits into the fitting jaw 34 of the tight frame 3 (fitting portion fitting step). As a result, the bottom seam 27 (third bottom hooking portion 271) also fits into the protrusion 35 (first hooking portion 361).

[0069] Next, the worker places the folding plate 2A so that the upper seam 26 of the folding plate 2A covers the lower seam 27 of the folding plate 2 (upper seam placing step).

[0070] Next, the worker fastens the upper seam 26 of the folding plate 2A together with the lower seam 27 of the folding plate 2 (fastening step). After this, the above steps are repeated. In this way, the folding plates 2, 2A and the tight frame 3 can be easily joined, and the folding plates 2, 2A can be attached to the tight frame 3.

[0071] <Positioning> As described above, in the "bottom seam positioning step," the bottom seam 27 of the folding plate 2 is hooked onto the protrusion 35 of the tight frame 3. At this time, the inner wall of the approximately triangular apex of the bottom seam 27 is engaged with the upper tip of the protrusion 35, thereby restricting movement of the bottom seam 27. As a result, the folding plate 2 is held in a positioned state by the protrusion 35.

[0072] The lower seam 27 is hooked on the protrusion 35, which prevents the folding plate 2 from escaping laterally (towards the bottom 22). Even if the folding plate 2A is stepped on, the folding plate 2 does not shift in its lateral position, and the folding plates 2, 2A, and the protrusion 35 can be easily fitted together, improving workability.

[0073] <Waterproof> 13 is an enlarged view showing an example of the seam fastening portion 25. As described above, the upper seam 26 and the lower seam 27 are formed to have different shapes. Specifically, for example, the upper seam 26 has a substantially trapezoidal outer shape, and the lower seam 27 has a substantially triangular outer shape.

[0074] As shown in FIG. 13, the upper seam 26 has a pair of corners 263a, 263b on the upper surface, and the lower seam 27 has a pair of oblique sides 273a, 273b.

[0075] When the upper seam 26 and the lower seam 27 are fastened together, a pair of corners 263a and 263b are arranged at a distance from each other at positions facing the pair of oblique sides 273a and 273b.

[0076] As a result, a plurality of spaces 28 are formed between the pair of oblique sides 273a, 273b and the pair of corners 263a, 263b, which prevents capillary action within the fastened portion 25 and prevents rainwater and the like from entering the fastened portion 26.

[0077] It is also possible to place a waterproof sheet, a waterproofing agent, or the like in the space 28 to more effectively prevent the intrusion of rainwater, etc.

[0078] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the first embodiment, and the description thereof will not be repeated.

[0079] FIG. 14 is an example of a front view of a tight frame 3A according to embodiment 2 of the present invention, FIG. 15 is an example of a plan view, FIG. 16 is an example of an oblique view seen from above, and FIG. 17 is another example of an oblique view seen from below.

[0080] The tight frame 3A will be described with reference to Figures 14 to 16. The tight frame 3A differs from the tight frame 3 of the first embodiment in that a fitting head 31A is attached to the mountain portion 31 so as to cover the mountain portion 31.

[0081] The fitting head 31A has a pair of fitting jaws 34A protruding to the left and right, and a protrusion 35A and a hooking portion 36A at the top. The fitting jaws 34A fit with the fitting protrusions 241 of the folding plate 2, and the protrusions 35A are fastened to the upper seam 26 and the lower seam 27.

[0082] The protrusion 35A and the latching portion 36A are formed by cutting and raising a part of the fitting head 31A.

[0083] Unlike the tight frame 3, the fitting head 31A is not formed integrally with the tight frame 3, but is formed separately and attached to the mountain portion 31 by caulking or the like.

[0084] By making the fitting head 31A a separate structure, the fitting head 31A can be attached to and used with tight frames of various standards and sizes. This allows the protrusion 35A to be fastened to the upper seam 26 and the lower seam 27 even with existing tight frames, improving the joining strength.

[0085] [Means for solving the problem] In order to solve the above problems, a roofing material in one embodiment of the present disclosure comprises an upper seam located at one end in the working width direction, a lower seam located at the other end, a bottom portion located between the upper seam and the lower seam, and a pair of inclined portions extending at an angle between the upper seam, the lower seam, and the bottom portion, wherein the upper seam has a first bottom hooking portion that is hooked by seam fastening to a first hooking portion that protrudes from a protrusion formed on the top of the tight frame, and the bottom seam has a third bottom engaging portion that is hooked to the first hooking portion, but does not have a bottom hooking portion that hooks from below onto the protrusion on the opposite side to the first hooking portion.

[0086] According to the above configuration, the lower seam can have a large opening for inserting the protrusion. Also, unlike the first and second bottom hooks of the upper seam, the lower seam does not have neck portions that sandwich the protrusion from both sides. This makes it easy to fit the protrusion into the lower seam.

[0087] The top seam may include a second bottom hook portion that is hooked onto a second hook portion that protrudes on the opposite side from the first hook portion.

[0088] The upper seam may have a pair of corners on its upper surface, and the lower seam may have a pair of oblique sides, and when the upper seams and lower seams of the multiple roof materials are fastened to each other, the pair of corners may be arranged at a distance from each other in a position opposite the pair of oblique sides.

[0089] According to the above configuration, multiple spaces are formed between the pair of oblique sides and the pair of corners. This prevents capillary action within the seam and prevents rainwater and other water from entering the seam. Furthermore, by placing a waterproof sheet, waterproofing agent, etc. in the spaces, the intrusion of rainwater and other water can be prevented more effectively.

[0090] The upper seam and the lower seam may be formed to have different shapes when fastened together.

[0091] In a seamed state, the upper seam may have a generally trapezoidal outer shape, and the lower seam may have a generally triangular outer shape.

[0092] According to the above configuration, the lower seam is formed in a generally triangular shape and is tapered upward, so that the top of the generally triangular shape of the lower seam can be easily inserted into and fitted into the opening of the upper seam.

[0093] In addition, the lower seam can be hooked onto the protrusion of the tight frame, and the inner wall of the approximately triangular apex of the lower seam can be engaged with the upper tip of the protrusion, preventing the lower seam from moving. This allows the folded plates to be easily fitted together without shifting position even if they are stepped on.

[0094] The first bottom hook portion and the second bottom hook portion may be formed to be at different positions in the vertical direction.

[0095] The roof structure may comprise a plurality of the above roof materials and a plurality of tight frames, and each tight frame may comprise a pair of inclined surfaces, a top located between the pair of inclined surfaces, a pair of engaging jaws provided on the pair of inclined surfaces and engaging with two roof materials, a protrusion formed to protrude from the top and holding the two roof materials when fastened together with the two roof materials, and a first hooking portion protruding from the protrusion.

[0096] 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]

[0097] 1 Roof structure 2. Folded plate (roofing material) 3 Tight Frame 22 Bottom 23 Slope 26 Upper saddle 27 Lower 31 Mountain (top) 33 Connecting part (slanted surface) 35 Protrusion 261 First bottom latch 262 Second bottom latch 263a, 263b corner 271 Third bottom latch 273a, 273b hypotenuse 361 First latch 362 Second latch

Claims

1. A pair of inclined surfaces; an apex portion located between the pair of inclined surfaces; A pair of fitting jaws provided on the pair of inclined surfaces and fitting with two roof materials; a protrusion formed to protrude from the top and to hold the two roofing materials in a state where the two roofing materials are fastened together; a first latch portion protruding from the protrusion, A tight frame characterized in that the protrusion is formed by cutting out and raising a part of the plate member that forms the top.

2. The tight frame described in claim 1, characterized in that the protrusion portion restrains movement of the bottom seam by engaging at least a portion of the bottom seam formed at one end of the roof material.

3. 3. The tight frame according to claim 1, wherein the protrusion further comprises a second hooking portion protruding from the protrusion in a direction different from that of the first hooking portion.

4. A construction method for a roof structure in which a folded plate is attached to a tight frame, A bottom seam arrangement step in which the bottom seam formed on the first folding plate is hooked and held on a protrusion formed on the top of the tight frame; A fitting portion fitting step in which the fitting protrusion of the first folding plate is fitted into the fitting jaw portion of the tight frame by pressing the bottom portion of the first folding plate from above downward, and the lower seam is fitted into the protrusion portion; An upper seam arrangement step of arranging the second folding plate so that the upper seam of the second folding plate adjacent to the first folding plate covers the lower seam; and a seam fastening step of seam fastening the upper seam together with the lower seam and the protrusion.

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