Tight frames for double corrugated metal roofs and double corrugated metal roofs

Abstract

To improve the sound insulation performance of double-layered corrugated metal roofs. [Solution] The tight frame for a double-folded roof of the present invention is a tight frame that is tightened and fixed from the outside of the two lower chord members by a connecting fitting that engages with each of the two lower chord members that are seamed together and also engages with the two upper chord members that are seamed together above the two lower chord members, and is characterized by comprising: at least one pair of leg members fixed to a base material; a locking member fixed to the upper end of the pair of leg members and having a linking portion that engages with each of the two lower chord members that are seamed together; and a vibration damping member disposed from the upper surface of the locking member to the linking portion and pressed against the two lower chord members that are tightened by the connecting fitting.

Description

Technical Field

[0001] The present invention relates to a tight frame for a double-folded plate roof and a double-folded plate roof used when constructing a double-folded plate roof.

Background Art

[0002] As a method of constructing roofs for factories, warehouses, stores, etc., there is a known method of butting and joining two adjacent metal folded plate roof materials using roof receivers (tight frames) fixed at regular intervals to a roof base such as a beam (see Patent Document 1).

[0003] In a roof using a folded plate roof material (hereinafter referred to as a folded plate roof), not only does the folded plate roof material lift due to the influence of wind pressure caused by strong winds, but the roof material itself may also deform. Therefore, in order to improve the strength of the folded plate roof material, for example, one or a plurality of small stepped portions are provided on the inclined side plate portion of the folded plate roof material, a large stepped portion protruding toward the base side is provided at the lower end portion of the inclined side plate portion, a stepped portion protruding upward is provided at the base portion, etc. are adopted (see Patent Document 2). By using a folded plate roof material having such a configuration, the strength of the folded plate roof material becomes high, and it is possible to suppress the lifting of the folded plate roof material and the deformation of the folded plate roof material in the folded plate roof.

[0004] By the way, as a folded plate roof, for example, there is a double-folded plate roof. The double-folded plate roof has a structure in which, for example, a heat insulating material is laid between a folded plate roof material (lower chord material) butted and joined using a tight frame and a folded plate roof material (upper chord material) butted and joined using a roof receiver (joining fitting) above it.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] Incidentally, in double-layered corrugated metal roofs, the upper chord material is susceptible to thermal deformation due to sunlight exposure, and this thermal deformation is prone to generating abnormal noises. Such thermal deformation and the resulting abnormal noises can be suppressed by using the corrugated metal roofing material disclosed in Patent Document 2. However, the corrugated metal roofing material disclosed in Patent Document 2 does not completely suppress the aforementioned thermal deformation and the resulting abnormal noises, so further improvement in noise reduction performance is required for double-layered corrugated metal roofs.

[0007] The present invention aims to provide a tight frame for a double-folded metal roof and a double-folded metal roof that can improve the sound insulation performance of the double-folded metal roof. [Means for solving the problem]

[0008] From one perspective, the tight frame for a double corrugated roof of the present invention is a tight frame for a double corrugated roof that is fastened and fixed from the outside of two lower chord members that are to be seamed together by a connecting fitting that engages with each of the two lower chord members that are to be seamed together and also engages with two upper chord members that are to be seamed together above the two lower chord members, and is characterized by comprising: at least one pair of leg members fixed to a base material; a locking member fixed to the upper end of the pair of leg members and having a connecting portion that engages with each of the two lower chord members that are to be seamed together; and a vibration damping member disposed from the upper surface of the locking member to the connecting portion and pressed against the two lower chord members that are to be fastened together by the connecting fitting.

[0009] Furthermore, the lower chord and upper chord members are folded plate roofing materials having a base, inclined side plate sections that rise diagonally from each of the widthwise ends of the base, horizontal sections that extend from each of the upper ends of the inclined side plate sections, an inner seam fitting section and an outer seam fitting section erected on each of the horizontal sections, and an overhang section that extends from the horizontal section to the inclined side plate section toward the base. Preferably, the overhang section engages with the connecting section of the locking member when the two lower chord members are seamed together, and presses against the vibration damping member when the two lower chord members are tightened from the outside with the joining fitting.

[0010] Furthermore, it is preferable that the inclined side plate portion has at least one small step portion in the height direction of the inclined side plate portion, or at least one large step portion that is connected to the base portion and protrudes toward the base portion.

[0011] Furthermore, it is preferable that the base portion has a projection that protrudes upward from the center in the width direction.

[0012] Furthermore, a double-folded metal roof from another perspective is characterized by having the above-mentioned tight frame for the double-folded metal roof, a lower chord member that engages with a locking member when the seams are fastened, a connecting fitting that fastens and fixes the lower chord member to a vibration damping member by fastening it through the seam fastening portion of the lower chord member, and an upper chord member that engages with the connecting fitting when the seams are fastened above the lower chord member.

[0013] In this case, it is preferable that an insulating material is placed between the lower chord and the upper chord. [Effects of the Invention]

[0014] According to this disclosure, it is possible to improve the sound insulation performance of double-layered corrugated metal roofs. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic cross-sectional view showing an example of a double-layered corrugated metal roof as described in this embodiment. [Figure 2] This is a perspective view showing an example of the configuration of corrugated metal roofing material. [Figure 3] It is a front view showing an example of the structure of a folded plate roof material. [Figure 4] (a) is a front view of the tight frame, (b) is a plan view of the tight frame, and (c) is a right side view of the tight frame. [Figure 5] (a) is a perspective view showing the state before attaching the vibration damping sheet to the locking member of the tight frame, and (b) is a view showing the state after attaching the vibration damping sheet to the locking member of the tight frame. [Figure 6] It is a front view showing the state where the tight frame is fixed to the roof base. [Figure 7] It is a front view showing the state where the lower chord member is caulked and fastened to the tight frame. [Figure 8] It is a front view showing the state where the joint fitting is fixed to the caulked and fastened part of the lower chord member. [Figure 9] (a) is a plan view of the double-folded plate roof used in the verification experiment, and (b) is a cross-sectional view taken along the -A' line in (a).

Embodiments for Carrying Out the Invention

[0016] Hereinafter, the structure of the folded plate roof shown in this embodiment will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the structure of a double-folded plate roof.

[0017] As shown in FIG. 1, the double-folded plate roof 10 includes a plurality of folded plate roof materials 13A caulked and joined to the double-folded plate roof tight frames 12, 12 fixed to the roof base 11, a plurality of folded plate roof materials 13B caulked and joined to the fittings 14, 14 fixed to the caulked and joined portions of adjacent folded plate roof materials 13A, and a heat insulating material 15 laid between these folded plate roof materials 13A, 13B. The folded plate roof materials 13A, 13B are formed by bending a rectangular metal plate. Here, the roof base 11 corresponds to the base material described in the claims. In the following description, the double-folded plate roof tight frame 12 is simply referred to as the tight frame 12.

[0018] In the following description, the folded-plate roof member 13A is referred to as the lower chord member 13A, and the folded-plate roof member 13B is referred to as the upper chord member 13B, respectively. Also, the fitting 14 fixed to each of the butting joints of two adjacent lower chord members 13A is referred to as the joining fitting 14.

[0019] Next, the lower chord member 13A and the upper chord member 13B will be described. The lower chord member 13A and the upper chord member 13B are made of folded-plate roof members 13 having the same shape.

[0020] As shown in FIGS. 2 and 3, the folded-plate roof member 13 is formed by bending a rectangular metal plate. The folded-plate roof member 13 has a base portion 21, inclined side plate portions 22 and 23, horizontal portions 24 and 25, an outer butting side fitting portion 26, and an inner butting side fitting portion 27. The working width P1 of the folded-plate roof member 13 is, for example, 0.5 m.

[0021] The base portion 21 has a central stepped portion 21a protruding upward at the center in the width direction (the middle direction in FIG. 2) of the base portion 21. This central stepped portion 21a extends along the longitudinal direction (the ridge direction in FIG. 2) of the folded-plate roof member 13. Note that the central stepped portion 21a does not necessarily need to be provided on the base portion 21. Also, instead of providing the central stepped portion 21a on the base portion 21, it is also possible to provide a central concave portion.

[0022] The inclined side plate portions 22 and 23 extend so as to incline in a direction away from the base portion 21 from each of both ends in the middle direction. At the lower end portions in the extending direction of the inclined side plate portions 22 and 23, large stepped portions 22a and 23a continuous with the base portion 21 are provided. Also, at the central portions in the extending direction of the inclined side plate portions 22 and 23, small stepped portions 22b and 23b are provided. In the present embodiment, the case where one small stepped portion 22b and 23b is provided is illustrated, but it is also possible to provide two or more small stepped portions 22b and 23b.

[0023] Furthermore, the upper ends of the inclined side plate portions 22 and 23 in the extending direction are provided with overhang portions 22c and 23c that extend toward the base portion 21. The overhang portions 22c and 23c engage with the tight frame 12 or the joining fitting 14 when adjacent folded plate roofing materials 13 are joined by seam fastening.

[0024] In this embodiment, in addition to providing a central step portion 21a in the base portion 21, the strength of the corrugated roofing material 13 is improved by providing small step portions 22b, 23b and large step portions 22a, 23a in each of the inclined side plate portions 22, 23. However, at least one of the central step portion 21a, small step portions 22b, 23b, and large step portions 22a, 23a may be omitted.

[0025] The horizontal section 24 is provided so as to slope downward from the outer seam fitting section 26 toward the inclined side plate section 22. Similarly, the horizontal section 25 is provided so as to slope downward from the inner seam fitting section 27 toward the inclined side plate section 23. This prevents water from entering the area where the inner seam fitting section 27 and the outer seam fitting section 26 are joined together when two adjacent corrugated roofing materials are joined together by seam fastening.

[0026] The outer seam fitting portion 26 is fitted to the outside of the inner seam fitting portion 27 of the adjacent corrugated roofing material 13. At this time, the overhang portion 22c, which is continuous with the outer seam fitting portion 26 via the horizontal portion 24, and the overhang portion 23c, which is continuous with the inner seam fitting portion 27 of the adjacent corrugated roofing material 13 via the horizontal portion 25, are locked to the locking member 32 of the tight frame 12 or the locking member 52 of the connecting fitting 14.

[0027] The outer seam fitting portion 26 is formed by bending one end of a metal plate multiple times. The inner seam fitting portion 27 is formed by bending the other end of a metal plate multiple times. The outer seam fitting portion 26 and the inner seam fitting portion 27 are not limited to the shape shown in Figure 3, for example, as long as the outer seam fitting portion 26 fits into the inner seam fitting portion 27 of the adjacent folded roofing material 13 when the two adjacent folded roofing materials 13, 13 are engaged by seam fastening.

[0028] As shown in Figures 4(a), 4(b), and 4(c), the tight frame 12 is a fitting for joining the lower chord members 13A, 13A to the roof base 11. The tight frame 12 has a frame body 31 whose center in the longitudinal direction is bent upward, and a locking member 32 that is fixed to a protruding portion of the frame body 31.

[0029] In this embodiment, a tight frame 12 is illustrated, which has a frame body 31 that is bent upward in the center in the longitudinal direction and a locking member 32 that is fixed to the bent portion of the frame body 31. However, it is also possible to use a tight frame in which a frame body has multiple such bent portions provided at predetermined intervals and a locking member is fixed to each of the multiple bent portions.

[0030] The frame body 31 is composed of a pair of leg members 31a and 31b and a connecting portion 31c that connects the upper ends of the pair of leg members 31a and 31b. In a side view, the frame body 31 is a so-called mountain-shaped member with its central portion protruding upward. The lower ends of the pair of leg members 31a and 31b are provided with tongue-shaped pieces 31d and 31e that bend outward. These tongue-shaped pieces 31d and 31e are provided to fix the tight frame 12 to the roof base 11. Although not shown in the illustration, the tongue-shaped pieces are provided with through holes through which screws are inserted, for example.

[0031] The locking member 32 is a member that is fixed to the upper ends of a pair of leg members 31a and 31b, that is, to the connecting portion 31c that connects the upper ends of the pair of leg members 31a and 31b. The locking member 32 is a cap-shaped member with a recess 32a formed therein. The connecting portion 31c of the frame body 31 is fixed in contact with the bottom surface of the recess 32a. Methods for fixing the locking member 32 to the connecting portion 31c of the frame body 31 include, for example, fixing it using bolts 34 and nuts 35, or welding the locking member to the connecting portion 31c. Figure 4 illustrates a case in which the frame body 31 and the locking member 32 are fixed together with bolts 34 and nuts 35, with the connecting portion 31c of the frame body 31 in contact with the bottom surface of the recess 32a of the locking member 32.

[0032] The locking member 32 has connecting portions 32b and 32c that protrude outward. The connecting portions 32b and 32c are locked to the protruding portion 23c of one corrugated roofing material 13A and the protruding portion 22c of the other corrugated roofing material 13A, respectively, when the adjacent lower chord members 13A, 13A are engaged in seam fastening.

[0033] As shown in Figures 5(a) and 5(b), a vibration damping sheet 41 is attached to the locking member 32 from its upper surface 32d to the connecting portion 32b, 32c. The method for attaching the vibration damping sheet 41 to the locking member 32 can be any appropriate method, such as using an adhesive sheet or an adhesive. Here, the vibration damping sheet 41 corresponds to the vibration damping member described in the claim.

[0034] The vibration damping sheet 41 may be made of a glass fiber mixture consisting of, for example, alumina borosilicate glass, an inorganic filler, an acrylic resin, a polyester resin, and a paint additive. Alternatively, the vibration damping sheet 41 may be made of a resin composition consisting of, for example, styrene-isoprene block copolymer, inorganic powder, and a polyolefin resin. In this case, examples of inorganic powders include metal oxides such as iron oxide, titanium oxide, and magnesium oxide, granular metals, mineral powders such as clay, talc, mica, and quartz powder, glass fibers, glass powder, calcium carbonate, and gypsum.

[0035] Returning to Figure 1, the connecting fitting 14 is a fitting for joining the upper chord member 13B to the lower chord member 13A. The connecting fitting 14 has a pair of clamping pieces 51a, 51b and a locking member 52. The upper ends of the pair of clamping pieces 51a, 51b are connected. The pair of clamping pieces 51a, 51b are connected to the adjacent lower chord members 13A, 13A by gripping the position directly above the locking member 32 of the tight frame 12 at the seam-fastening portion. The distance between the pair of clamping pieces 51a, 51b is adjusted by a bolt 53 and a nut 54.

[0036] The locking member 52 has connecting portions 52a and 52b that protrude outward. The connecting portions 52b and 52c are locked to the protruding portion 23c of one corrugated roofing material 13B and the protruding portion 22c of the other corrugated roofing material 13B, respectively, when the adjacent upper chord members 13B, 13B are engaged in seam fastening.

[0037] The insulation material 15 is, for example, glass wool. The density of glass wool is, for example, 10 kg / m³. 3 The above materials are used. In addition, the insulation material 15 may be used as a single layer of 100 mm thick glass wool, or as two layers of 50 mm thick glass wool.

[0038] Next, a method for constructing the double-layered corrugated metal roof 10 will be described. As shown in Figure 6, the tight frames 12 are fixed to the roof substrate at predetermined intervals in the direction of the beams and the direction of the eaves and ridge. At this time, vibration damping sheets 41 may be attached to the locking members 32 of the tight frames 12 in advance, or the vibration damping sheets 41 may be attached to the locking members 32 of each tight frame 12 after the tight frames 12 have been fixed to the roof substrate 11.

[0039] Subsequently, multiple lower chord members 13A are laid on the roof base 11 in the girder direction. At this time, of the two adjacent lower chord members 13A, the overhang portion 23c of the inclined side plate portion 23 of one lower chord member 13A engages with the connecting portion 32b of the locking member 32 of the tight frame 12. Also, the overhang portion 22c of the inclined side plate portion 22 of the other lower chord member 13A engages with the connecting portion 32c of the locking member 32 of the tight frame 12. At this time, the inner seam fitting portion 27 of one lower chord member 13A fits into the outer seam fitting portion 26 of the other lower chord member 13A. In this state, the outer seam fitting portion 26 of the other lower chord member 13A is seamed into the inner seam fitting portion 27 of the one lower chord member 13A (see Figure 7). In this way, two lower chord members 13A that are adjacent to each other in the girder direction are seamed into each other.

[0040] When the adjacent lower chord member 13A is engaged by seam fastening, the connecting fitting 14 is fixed directly above the seam fastened portion S. In addition, insulation material 15 is laid on the lower chord member 13A. Finally, the upper chord member 13B is laid in the direction of the girder.

[0041] At this time, of the two adjacent upper chord members 13B, the overhang portion 23c of the inclined side plate portion 23 of one upper chord member 13B engages with the connecting portion 52a of the locking member 52 of the connecting fitting 14. Also, the overhang portion 22c of the inclined side plate portion 22 of the other upper chord member 13B engages with the connecting portion 52b of the locking member 52 of the connecting fitting 14. At this time, the inner seam side fitting portion 27 of one upper chord member 13B of the two adjacent upper chord members fits into the outer seam side fitting portion 26 of the other upper chord member 13B. In this state, the outer seam side fitting portion 26 of the other upper chord member 13B is seamed into the inner seam side fitting portion 27 of the one upper chord member 13B. As a result, the double corrugated plate roof 10 is constructed (see Figure 1).

[0042] As described above, a vibration damping sheet 41 is attached to the locking member 32 of the tight frame 12. Therefore, when the two lower chord members 13A, which are adjacent to each other in the girder direction, are engaged by seam fastening, the vibration damping sheet 41 is held in a state of being pressed against the overhang portion 23c of the inclined side plate portion 23 and the overhang portion 22c of the inclined side plate portion 22 of the lower chord member 13A. As a result, although the vibration of the upper chord member 13B is transmitted to the joint fitting 14, the vibration damping sheet 41 attached to the locking member 32 of the tight frame 12 absorbs the vibration, preventing it from being transmitted to the lower chord member 13A. In other words, the generation of vibration in the lower chord member 13A is reduced, making it possible to improve noise reduction performance.

[0043] Finally, the results of a verification experiment regarding noise reduction performance are shown. As shown in Figures 9(a) and 9(b), the verification experiment involved dropping a steel ball 130 from above a double-layered corrugated roof 120 manufactured inside a box body 110 with an internal space of 1m x 1m. The impact sound generated when the steel ball 130 hit the double-layered corrugated roof 120 was recorded from the inside of the double-layered corrugated roof 120 using a microphone 140, and the sound pressure level was calculated from the recorded impact sound. The double-layered corrugated roof 120 used is the same double-layered corrugated roof 10 as in this embodiment. That is, the effective width of the corrugated roofing material used in the double-layered corrugated roof 120 is 0.5m. In this double-layered corrugated roof 120, the positions of the locking members 32 of the tight frame 12 are in four locations: regions A1, A2, A3, and A4. Here, the distance between regions A1 and A2, and the distance between regions A3 and A4, are the same (for example, 0.5 m).

[0044] The steel ball 130 was dropped from the center C1 of the upper surface of the double-layered corrugated roof 120. The height at which the steel ball 130 was dropped was 75 cm above the double-layered corrugated roof 120. In the verification experiment, the peak sound pressure level at the moment the dropped steel ball 130 first hits the double-layered corrugated roof 120 was measured. Therefore, the peak sound pressure level when the steel ball 130 bounces off the double-layered corrugated roof 120 and falls towards the double-layered corrugated roof 120 again and hits it was not measured.

[0045] Furthermore, the sound pressure level calculated from the recorded collision sound used an A-weighting pattern, which weights frequencies within the range of human hearing (for example, around 1000 Hz). Below, we will discuss the frequency range in which humans are most likely to perceive noise, for example, the 250-8 kHz range.

[0046] Examples 1 and 2 below describe cases using a double-layered corrugated roof with vibration damping sheets 41 attached to the tight frame 12. The verification results for Examples 1 and 2 are shown in Tables 1 and 2. Example 1 illustrates the case where a steel ball is dropped five times. Similarly, Example 2 illustrates the case where a steel ball is dropped five times. The "difference" in Tables 1 and 2 indicates the difference from the average values ​​in the comparative examples shown in Table 3, which will be described later.

[0047] [Table 1]

[0048] [Table 2]

[0049] Furthermore, as a comparative example, Table 3 shows the verification results using a double-folded plate roof without the vibration damping sheet 41 attached to the tight frame 12. The comparative example shows the case where a steel ball was dropped five times.

[0050] [Table 3]

[0051] First, let's explain the noise level results. In the comparative example, the noise levels were 95.9 dB, 95.5 dB, 96.2 dB, 96.2 dB, and 95.7 dB, with an average of 95.9 dB. On the other hand, in Example 1, the noise levels were 94.0 dB, 94.0 dB, 93.5 dB, 93.8 dB, and 93.8 dB, with an average of 93.8 dB. Therefore, it was found that the noise level in Example 1 was 2.1 dB lower than the noise level in the comparative example.

[0052] Furthermore, the noise levels in Example 2 were 93.1 dB, 93.9 dB, 93.6 dB, 93.5 dB, and 94.0 dB, with an average of 93.6 dB. Therefore, it was found that the noise level in Example 2 was 2.3 dB lower than the noise level in the comparative example.

[0053] Next, we will explain the octave band level in A-weighted characteristics. In the comparative example, the band levels were 87.1dB on average at 250Hz, 88.4dB on average at 500Hz, 90.6dB on average at 1kHz, 85.9dB on average at 2kHz, 81.4dB on average at 4kHz, and 73.3dB on average at 2kHz.

[0054] In Example 1, the band levels averaged 85.5 dB at 250 Hz, 84.9 dB at 500 Hz, 88.3 dB at 1 kHz, 83.7 dB at 2 kHz, 78.1 dB at 4 kHz, and 72.3 dB at 8 kHz. In other words, each band level in Example 1 was lower than each band level in the comparative example. In particular, it was found that the band levels in Example 1 decreased significantly from 500 Hz to 4 kHz.

[0055] In Example 2, the band levels averaged 85.4 dB at 250 Hz, 84.7 dB at 500 Hz, 88.0 dB at 1 kHz, 83.7 dB at 2 kHz, 78.0 dB at 4 kHz, and 72.4 dB at 8 kHz. In other words, in Example 2, as in Example 1, it was found that the band levels decreased significantly, particularly from 500 Hz to 4 kHz.

[0056] In other words, in a double-layered corrugated metal roof with vibration damping sheets 41 attached to the tight frame 12, the noise level was lower compared to a double-layered corrugated metal roof without vibration damping sheets 41 attached to the tight frame 12. Furthermore, it was found that the band level in the range of frequencies within the range of human hearing (for example, around 1000 Hz) was also reduced. Thus, it was found that attaching vibration damping sheets 41 to the tight frame 12 in a double-layered corrugated metal roof improves noise reduction performance.

[0057] <Summary of effects> The tight frame for a double-folded corrugated roof of this embodiment is a tight frame 12 that is tightened and fixed from the outside of the two lower chord members 13A, 13A that are to be seamed together by a connecting fitting 14 that engages with each of the two lower chord members 13A, 13A that are to be seamed together and also engages with the two upper chord members 13B, 13B that are to be seamed together above the two lower chord members 13A, 13A, and is characterized by having at least one pair of leg members 31a, 31b fixed to the roof base 11, a locking member 32 fixed to the upper ends of the pair of leg members 31a, 31b and having connecting portions 32b, 32c that engage with each of the two lower chord members 13A, 13A that are to be seamed together, and a vibration damping sheet 41 that is arranged from the upper surface of the locking member 32 to the connecting portions 32b, 32c and is pressed against the two lower chord members 13A, 13A that are to be tightened by the connecting fitting 14.

[0058] According to this, vibrations that occur when thermal deformation occurs in the upper chord members 13B, 13B are absorbed by the vibration damping sheet 41, so the sound generated as a result of these vibrations is reduced. As a result, the sound insulation performance of the double-layered corrugated metal roof can be improved compared to conventional designs.

[0059] Furthermore, the lower chord members 13A, 13A and the upper chord members 13B, 13B each consist of a base portion 21, inclined side plate portions 22, 23 that rise diagonally from each of the widthwise ends of the base portion 21, horizontal portions 24, 25 that extend outward from each of the upper ends of the inclined side plate portions 22, 23, an outer seam fitting portion 26 and an inner seam fitting portion 27 erected on each of the horizontal portions 24, 25, and inclined from the horizontal portions 24, 25. The corrugated metal roofing material 13 has overhangs 22c and 23c that extend toward the base portion 21 towards the side plate portions 22 and 23, and the overhangs 22c and 23c engage with the connecting portions 32b and 32c of the locking member 32 when the two lower chord members 13A and 13A are joined together, and press against the vibration damping sheet 41 when the two lower chord members 13A and 13A are tightened from the outside by the joining fittings 14.

[0060] According to this, vibrations caused by the thermal deformation of the upper chord members 13B, 13B are transmitted to the vibration damping sheet 41 via the connecting fitting 14 and absorbed by the vibration damping sheet 41. As a result, the sound generated by the thermal deformation of the upper chord members 13B, 13B can be reduced, and the noise reduction performance can be improved.

[0061] Furthermore, the inclined side plate sections 22 and 23 have at least one of either one of the following: one or more small stepped sections 22b and 23b in the height direction of the inclined side plate sections 22 and 23, or large stepped sections 22a and 23a that are connected to the base section 21 and project toward the base section 21. In addition, the base section 21 has a central stepped section 21a in the center in the width direction that projects toward upward.

[0062] For example, the strength of the corrugated roofing material can be increased by providing at least one of the following: one or more small steps 22b, 23b in the height direction of the inclined side plate sections 22, 23, or large steps 22a, 23a that are connected to the base section 21 and protrude toward the base section 21, or by providing a central step section 21a at the base section. In this case, when used as upper chord members 13B, 13B, there is the advantage that thermal deformation is less likely to occur, but there is the disadvantage that the noise generated due to thermal deformation becomes louder. However, by providing the vibration damping sheet 41 on the locking member 32 of the tight frame 12, the vibrations associated with thermal deformation are absorbed, and the noise generated is reduced. In other words, it has the exceptional effect of improving noise reduction performance.

[0063] Furthermore, the double-folded plate roof of the present invention comprises the tight frame 12 described above, lower chord members 13A, 13A that engage with the locking member 32 when the seams are fastened, a connecting fitting 14 that fastens and fixes the lower chord members 13A, 13A via the seam fastening portion S, thereby pressing the vibration damping sheet 41 against the lower chord members 13A, 13A, and upper chord members 13B, 13B that engage with the connecting fitting 14 when the seams are fastened above the lower chord members 13A, 13A.

[0064] According to this, vibrations caused by the thermal deformation of the upper chord members 13B, 13B are transmitted to the vibration damping sheet 41 via the connecting fitting 14 and absorbed by the vibration damping sheet 41. As a result, the sound generated by the thermal deformation of the upper chord members 13B, 13B can be reduced, and the noise reduction performance can be improved. [Explanation of Symbols]

[0065] 10 Double-layered corrugated metal roof 11 Roof underlayment 12 Tight frames for double-layer corrugated metal roofs 13. Corrugated metal roofing materials 13A Lower String 13B Upper chord material 14. Connecting hardware 15. Insulation 21 Base 22,23 Slanted side plate 22a,23a Large step part 22b,23b Small step part 22c,23c Overhang 31 Frame body 32 Locking member 32b, 32c Linkage section 41 Vibration damping sheet 52 Locking member

Claims

1. A tight frame for a double corrugated metal roof, which is fastened and secured from the outside of the two lower chord members that are to be seamed together, by a connecting fitting that engages each of the two lower chord members that are to be seamed together, and also engages the two upper chord members that are to be seamed together above the two lower chord members, At least one pair of leg members fixed to the base material, A locking member having a connecting portion that is fixed to the upper end of the pair of leg members and engages with each of the two lower chord members that are crimped together, A vibration damping member is provided, which is arranged from the upper surface of the locking member to the connecting portion and is pressed against the two lower chord members that are tightened by the connecting fitting, A tight frame for a double-layered corrugated metal roof, characterized by having the following features.

2. The lower chord and upper chord are corrugated metal roofing materials having a base, inclined side plate sections rising diagonally from each of the widthwise ends of the base, horizontal sections extending from each of the upper ends of the inclined side plate sections, inner seam fitting sections and outer seam fitting sections erected on each of the horizontal sections, and overhanging sections extending from the horizontal sections to the inclined side plate sections toward the base. The overhang portion engages with the connecting portion of the locking member when the two lower chord members are joined together, and presses against the vibration damping member when the two lower chord members are tightened from the outside by the joining fitting, as described in claim 1, for a double corrugated roof tight frame.

3. The tight frame for a double corrugated roof according to claim 2, characterized in that the inclined side plate has at least one small step portion in the height direction of the inclined side plate, or a large step portion that is connected to the base portion and protrudes toward the base portion.

4. The tight frame for a double corrugated metal roof according to claim 2, characterized in that the base portion has a projection that protrudes upward from the center in the width direction.

5. A tight frame for a double corrugated metal roof according to any one of claims 1 to 4, A lower chord member that engages with the locking member when crimped, A connecting fitting that fastens and secures the lower chord member to the vibration damping member via the crimped portion of the lower chord member, An upper chord member that engages with the aforementioned joint fitting when crimped above the lower chord member, A double-layered corrugated metal roof characterized by having the following features.

6. The double corrugated metal roof according to claim 5, characterized in that an insulating material is provided between the lower chord member and the upper chord member.

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