Corrugated roof

Abstract

To provide a corrugated roof capable of appropriately reducing low-frequency sounds.SOLUTION: A damping material 50 containing granular material 54 is interposed in a gap formed between a first corrugated roof 14 and a second corrugated roof 16 positioned below the first corrugated roof 14. This reduces vibration of the second corrugated roof 16 by absorbing vibrational energy transmitted to the second corrugated roof 16 by the granular material 54. Consequently, sound in the low-frequency range associated with the vibration of the second corrugated roof 16 can be appropriately reduced by the damping material 50.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to sound insulation of a folded-plate roof having a concave-convex shape. [Background technology]

[0002] Folded-plate roofs (also called semi-folded roofs) are sometimes used on buildings such as arenas, factories, and logistics facilities. A folded-plate roof is a roof formed by folding metal plates with a thickness of approximately 0.6 to 1.2 mm into an uneven shape. It is known that in buildings equipped with such folded-plate roofs, the impact sound caused by, for example, raindrops hitting the roof is transmitted into the building. Therefore, structures that block such sounds transmitted into the building (hereinafter referred to as sound-insulating structures) have been proposed. Examples of such sound-insulating structures include attaching glass wool to one side of a folded-plate roof, attaching a vibration-damping sheet to a folded-plate roof, applying vibration-damping paint to a folded-plate roof, and using a double- or triple-layered folded-plate roof.

[0003] Furthermore, Patent Document 1 discloses a technology for ensuring sound insulation in a folded-plate roof in which a resin foam sheet is laminated on one side of a metal plate by forming irregularities in the resin foam sheet and filling the recesses of the irregular shape with granular material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-345661 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the case of a folded-plate roof with a sound-insulating structure, such as the technology described in Patent Document 1, although high-frequency sounds are reduced, low-frequency sounds are not sufficiently reduced, and there is room for improvement.

[0006] The present invention has been made to solve the above problems, and its purpose is to provide a folded plate roof that can appropriately reduce sound in the low frequency range. [Means for solving the problem]

[0007] The corrugated plate roof according to the first aspect comprises a first corrugated plate roof formed in an uneven shape, a second corrugated plate roof also formed in an uneven shape and arranged below the first corrugated plate roof so as to overlap the first corrugated plate roof, a fixing device that connects the first corrugated plate roof and the second corrugated plate roof while forming a gap between the first corrugated plate roof and the second corrugated plate roof, and a vibration-damping material that includes granular material and is interposed in the gap between the first corrugated plate roof and the second corrugated plate roof.

[0008] For example, when raindrops collide with the first folded-plate roof, the first folded-plate roof vibrates, and the vibrations are transmitted to the second folded-plate roof via the fasteners, generating noise. This noise also occurs in the low-frequency range. In contrast, according to the first aspect, a damping material containing granular material is interposed between the first folded-plate roof and the second folded-plate roof, so that the vibration energy transmitted to the second folded-plate roof is absorbed by the damping material, thereby reducing the vibration of the second folded-plate roof. As a result, the damping material can appropriately reduce noise in the low-frequency range caused by the vibration of the second folded-plate roof.

[0009] In the second aspect, it is desirable that the folded-plate roof of the first aspect further comprises the following feature: That is, the folded-plate roof according to the second aspect further comprises a fiber-based sound-absorbing material interposed in the gap between the first folded-plate roof and the second folded-plate roof. According to the second aspect, by absorbing high-frequency sounds with the fiber-based sound-absorbing material, it is possible to appropriately reduce high-frequency sounds as well.

[0010] In the third aspect, it is desirable that the folded plate roof of the first or second aspect further comprises the following feature. That is, in the folded plate roof according to the third aspect, the damping material is arranged in the recess of the second folded plate roof. According to the third aspect, since the damping material is arranged in the recess of the second folded plate roof, construction is facilitated and workability is improved.

[0011] In a fourth aspect, it is desirable that the folded-plate roof of any one of the first to third aspects further comprises the following feature. That is, in the folded-plate roof according to the fourth aspect, the vibration-damping material comprises granular material having a specific gravity in the range of 0.9 to 2.5 and a particle size in the range of 0.5 mm to 6.0 mm, and a bag for containing the granular material. According to the fourth aspect, since the granular material is contained in the bag, the construction of the folded-plate roof is facilitated and workability is improved. Furthermore, by setting the specific gravity and particle size of the granular material within the above ranges, the granular material can efficiently absorb the vibration energy transmitted to the second folded-plate roof, thereby improving the sound insulation of the folded-plate roof.

[0012] The granules may contain at least one main material selected from the group consisting of synthetic resin and synthetic rubber, and the synthetic resin may be at least one selected from the group consisting of PVC, PP, LDPE, HDPE, PS, ABS, PET, soft PVC, olefin elastomer, styrene elastomer, polyester elastomer, urethane elastomer, polybutadiene elastomer, and polyamide elastomer. The synthetic rubber may be at least one selected from the group consisting of styrene-butadiene rubber, butadiene rubber, butyl rubber, notryl rubber, and ethylene-propylene rubber.

[0013] The fiber-based sound absorbing material may be at least one selected from the group consisting of glass wool, rock wool, urethane foam, and polyester. [Effects of the Invention]

[0014] According to the present invention, a folded-plate roof that can appropriately reduce sounds in the low-frequency range can be provided. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing the overall structure of a folded plate roof. [Figure 2] FIG. 2 is an enlarged perspective view of a portion of the folded-plate roof of FIG. 1. [Figure 3] FIG. 1 is a perspective view of a folded plate constituting the first folded plate roof. [Figure 4] FIG. 2 is a front view of the folded plate roof as seen from the X direction in FIG. 1. [Figure 5] FIG. 2 is a schematic perspective view showing the external structure of the vibration-damping material. [Figure 6] FIG. 6 is a diagram showing a cross section taken along the line AA in FIG. 5, and is a schematic cross-sectional view showing a part of the internal structure of the vibration-damping material. [Figure 7] FIG. 3 is a perspective view showing the state in which the first folded plate roof and glass wool are removed from FIG. 2. [Figure 8] FIG. 1 is an external view showing the overall structure of a rainfall noise test device. [Figure 9] FIG. 10 is a diagram showing the measurement results of sound transmission loss measured using a rain noise test device. [Figure 10] The figure shows the results of measuring rainfall noise using a rainfall noise measuring device. [Figure 11] 11A and 11B are diagrams showing the structures of a single folded-plate roof, a double folded-plate roof, and a triple folded-plate roof, which correspond to the comparative examples of FIGS. 9 and 10. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Embodiment Mode] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall structure of a folded-plate roof 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an enlarged view of a portion of the lower right portion of the folded-plate roof 10 in FIG. 1. The folded-plate roof 10 is applicable not only to relatively large buildings such as arenas, factories, and logistics facilities, but also to medium-sized or small buildings such as stores and warehouses. The folded-plate roof 10 may also be applied to residential buildings where people live.

[0017] As shown in FIGS. 1 and 2, the folded-plate roof 10 is a double-layered folded-plate roof consisting of two unevenly formed folded-plate roofs stacked one above the other. The folded-plate roof 10 is supported by multiple roof underlayments 8a-8c arranged below the folded-plate roof 10. Each of the roof underlayments 8a-8c is composed of a longitudinally shaped steel frame. The roof underlayments 8a-8c are stacked in three vertical tiers, perpendicular to each other in a plan view. The multiple roof underlayments 8a (8b or 8c) are arranged horizontally at predetermined intervals. Each of the roof underlayments 8a-8c may be composed of, for example, hollow rectangular timber or an I-beam with an I-shaped cross section. In FIGS. 1 and 2, the X direction corresponds to the longitudinal direction of the roof underlayment 8b, the Y direction corresponds to the longitudinal direction of the roof underlayment 8a, and the Z direction corresponds to the vertical direction. Hereinafter, the X direction in FIGS. 1 and 2 will be referred to as the longitudinal direction of the folded-plate roof 10, and the Y direction in FIGS. 1 and 2 will be referred to as the width direction of the folded-plate roof 10.

[0018] A tight frame 12 shown in Figure 2 is attached to the upper surface of the roof underlayment 8a. Note that in Figure 2, part of the tight frame 12 is exposed by removing a portion of the folded-plate roof 10. The tight frame 12 is attached along the longitudinal direction of the roof underlayment 8a (i.e., the width direction or Y direction of the folded-plate roof 10). The tight frame 12 may be attached to the roof underlayment 8a by welding, or may be attached via fasteners such as bolts and nuts.

[0019] When viewed from the X direction, the tight frame 12 is formed with an uneven shape that matches the uneven shape of the folded-plate roof 10. Specifically, the tight frame 12 has valley portions 12a that are fixed to the roof underlayment 8a while contacting the upper surface of the roof underlayment 8a, and peak portions 12b that are formed to protrude from the upper surface of the roof underlayment 8a. The valley portions 12a and peak portions 12b are formed alternately and continuously along the longitudinal direction of the roof underlayment 8a (i.e., the width direction of the folded-plate roof 10). The peak portions 12b are formed in a trapezoidal shape when viewed from the X direction. A retaining clip 12c is fixed to the upper base of the trapezoidal shape of the peak portions 12b via a fastener such as a bolt or nut.

[0020] The folded plate roof 10 includes a first folded plate roof 14, a second folded plate roof 16 arranged below the first folded plate roof 14, and a plurality of fasteners 18 that connect the first folded plate roof 14 and the second folded plate roof 16 while forming a predetermined gap G between the first folded plate roof 14 and the second folded plate roof 16. The first folded plate roof 14 and the second folded plate roof 16 are arranged to overlap each other while forming a gap G in the vertical direction.

[0021] When viewed from the X direction, the first folded-plate roof 14 has an uneven shape in which recesses 14a (valleys) and protrusions 14b (ridges) are alternately formed in the width direction of the folded-plate roof 10. When viewed from the X direction, the recesses 14a and protrusions 14b are each formed in a trapezoidal shape. Figure 3 is a perspective view of a folded plate 20 that constitutes the first folded-plate roof 14. The first folded-plate roof 14 is formed by connecting a plurality of longitudinally formed folded plates 20 shown in Figure 3 to adjacent folded plates 20.

[0022] The folded plate 20 includes a bottom 20a, a pair of inclined portions 20b, 20c sloping outward from both left and right ends of the bottom 20a, a first shoulder 20d extending parallel to the bottom 20a from the upper end of the inclined portion 20b, and a second shoulder 20e extending parallel to the bottom 20a from the upper end of the inclined portion 20c. The recess 14a of the first folded plate roof 14 is formed by including the bottom 20a and a portion of the pair of inclined portions 20b, 20c. The protrusion 14b of the first folded plate roof 14 is formed by including a portion of the pair of inclined portions 20b, 20c, the first shoulder 20d, and the second shoulder 20e.

[0023] The folded plate 20 further includes a first connection portion 20f and a second connection portion 20g. The first connection portion 20f and the second connection portion 20g are crimped together in a state where one folded plate 20 is overlapped with the second connection portion 20g of another adjacent folded plate 20 so that the upper portion of the first connection portion 20f is covered by the second connection portion 20g of another adjacent folded plate 20. This connects the first connection portion 20f and the second connection portion 20g.

[0024] When viewed from the X direction, the second folded plate roof 16 has an uneven shape in which recesses 16a (valleys) and protrusions 16b (mountains) are alternately formed. When viewed from the X direction in FIG. 1, the recesses 16a and protrusions 16b are each formed in a trapezoidal shape. The first folded plate roof 14 and the second folded plate roof 16 may have the same shape so that they overlap in the vertical direction. In this case, the second folded plate roof 16 is also formed by connecting multiple folded plates 20 shown in FIG. 3 to adjacent folded plates 20.

[0025] In addition, in the region where the tight frame 12 is provided in the longitudinal direction of the folded-plate roof 10, the first connection portion 20f and the second connection portion 20g are crimped together with the retaining clip 12c of the tight frame 12 sandwiched between the first connection portion 20f and the second connection portion 20g of the second folded-plate roof 16. This fixes the second folded-plate roof 16 to the tight frame 12.

[0026] The multiple fasteners 18 are metal fittings (fixing fittings) that connect the first folded-plate roof structure 14 and the second folded-plate roof structure 16 while forming a vertical gap G between them. The lower part of each fastener 18 is connected to the convex portion 16b of the second folded-plate roof structure 16. The upper part of each fastener 18 is connected to the convex portion 14b of the first folded-plate roof structure 14. Specifically, a retaining clip (not shown) is attached to the upper part of the fastener 18, and with the retaining clip sandwiched between the first connecting portion 20f and the second connecting portion 20g of the first folded-plate roof structure 14, the first connecting portion 20f and the second connecting portion 20g are crimped to each other. Furthermore, each fastener 18 may be attached to the same position in the longitudinal direction of the folded-plate roof structure 10 as the tight frame 12 is attached.

[0027] Fig. 4 is a front view of the folded-plate roof 10 as viewed from the X direction in Fig. 2. As shown in Fig. 4, glass wool 40 and vibration-damping material 50 are interposed in the gap G between the first folded-plate roof 14 and the second folded-plate roof 16.

[0028] The glass wool 40 is laid in the space formed by the gap G between the first folded-plate roof 14 and the second folded-plate roof 16, excluding the space where the vibration-damping material 50 and the fasteners 18 are arranged. The glass wool 40 has excellent heat insulation and sound absorption properties. Note that instead of the glass wool 40, other fibrous sound-absorbing materials with excellent heat insulation and sound absorption properties, such as rock wool, urethane foam, or polyester, may be used. Note that the glass wool 40 corresponds to the fibrous sound-absorbing material of the present invention.

[0029] The damping material 50 is disposed in the space formed by the gap G between the first folded-plate roofing member 14 and the second folded-plate roofing member 16, below the glass wool 40. Specifically, the damping material 50 is disposed so as to follow the shape of the recess 16a of the second folded-plate roofing member 16.

[0030] Next, the structure of the damping material 50 will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a schematic perspective view showing the external structure of the damping material 50, and Fig. 6 is a cross-sectional view taken along line AA in Fig. 5, which is a schematic cross-sectional view showing part of the internal structure of the damping material 50.

[0031] As shown in Figures 5 and 6, the vibration-damping material 50 includes a rectangular bag 52 and granular material 54 filled (contained) in the bag 52. The bag 52 is, for example, a resin tube with edge portions 52a formed by heat-sealing the openings at both ends of the bag 52. The material of the bag 52 is not particularly limited, but may be, for example, a film of polyethylene, polypropylene, or polyethylene terephthalate. Of these, flexible polyethylene is preferred. Furthermore, the bag 52 may be made of a nonwoven fabric.

[0032] 5, ventilation holes 52c having a diameter smaller than that of granular material 54 filled therein are formed in storage section 52b of bag 52. A plurality of ventilation holes 52c are formed, and air can pass through ventilation holes 52c to circulate between the inside and outside of bag 52.

[0033] The diameter of the vent hole 52c may be smaller than the particle size of the granular material 54, and is usually about 0.5 to 2.0 mm.

[0034] The granular material 54 filled inside the bag 52 contains, in its composition, at least one main material selected from synthetic resin and synthetic rubber. Furthermore, the specific gravity of the granular material 54 is adjusted to 0.9 to 2.5 (more preferably 1.2 to 2.2), and the particle size is 0.5 mm to 6.0 mm (more preferably 1.0 mm to 5.0 mm).

[0035] Examples of synthetic resins that can be used include PVC (polyvinyl chloride), PP (polypropylene), LDPE (low density polyethylene), HDPE (high density polyethylene), PS (polystyrene), ABS (acrylonitrile-butadiene-styrene copolymer), PET (polyethylene terephthalate), soft PVC, olefin-based elastomers, styrene-based elastomers, polyester-based elastomers, urethane-based elastomers, polybutadiene-based elastomers, and polyamide-based elastomers.

[0036] As synthetic rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), butyl rubber (IIR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), etc. can be used.

[0037] In addition to the above-mentioned main materials, the granular material 54 may contain secondary materials such as plasticizers, fillers (fillers for adjusting specific gravity), and fiber materials. Furthermore, the granular material 54 may be inorganic granular material such as perlite, natural glass foam, and sand.

[0038] The filling rate of the granular material 54 inside the bag 52 is adjusted to 30% to 90% by volume (more preferably 40% to 80% by volume). Note that the above filling rate is the volume ratio of the granular material 54 to the maximum volume of the bag 52.

[0039] Fig. 7 is a perspective view showing the state in which the first folded-plate roof 14 and the glass wool 40 have been removed from Fig. 2. As shown in Fig. 7, the multiple damping materials 50 are arranged without gaps along the concave shape of the recess 16a of the second folded-plate roof 16, and are also arranged without gaps along the longitudinal direction of the folded-plate roof 10.

[0040] The following describes the results of measuring sound (rain noise) using a rain noise measuring device 100 described below for the folded-plate roof 10 configured as above. Figure 8 is an external view showing the overall structure of the rain noise measuring device 100 used for the measurements. The rain noise measuring device 100 is a device that artificially causes rain to fall on a test specimen (folded-plate roof) inside a building 102 made of reinforced concrete, and measures the sound generated during this process.

[0041] The building 102 comprises a rain chamber 106 and a sound receiving chamber 108, separated by a wall 104. The rain chamber 106 is located directly above the sound receiving chamber 108. A rain making device 110 is installed in the rain chamber 106. The rain making device 110 can make rain fall at a preset rainfall [mm / h], raindrop size [mm], and falling speed [m / s].

[0042] The test specimen, a folded-plate roof 10, is placed directly below the rainfall device 110, between the rain chamber 106 and the sound receiving chamber 108. Specifically, a part of the wall 104 separating the rain chamber 106 and the sound receiving chamber 108 has an opening, and the folded-plate roof 10 is placed to cover this opening. In addition, a wooden floor 114 is provided between the wall 104 and the folded-plate roof 10 to adjust the opening.

[0043] A plurality of microphones 112 are arranged in the sound receiving room 108. The plurality of microphones 112 are devices that detect sounds generated in the sound receiving room 108.

[0044] Fig. 9 shows the measurement results of sound transmission loss [dB] measured using the above-mentioned rainfall noise measuring device 100. Fig. 10 shows the measurement results of sound pressure level [dB] of rainfall noise measured using the rainfall noise measuring device 100. The larger the sound transmission loss, the higher the sound insulation of the folded-plate roof 10, and the lower the sound pressure level, the higher the sound insulation.

[0045] 9 and 10 show the measurement results of Comparative Examples 1 to 3 for the folded-plate roof 10 (Example). In FIGS. 9 and 10, the single-layer folded-plate roof (Comparative Example 1) corresponds to a structure consisting of one (single-layer) folded-plate roof 120a shown in FIG. 11(a). The double-layer folded-plate roof (Comparative Example 2) corresponds to a structure consisting of two (double-layer) folded-plate roofs 120a and 120b shown in FIG. 11(b), with only glass wool 122 interposed between the folded-plate roofs 120. The triple-layer folded-plate roof (Comparative Example 3) corresponds to a structure consisting of three (triple-layer) folded-plate roofs 120a to 120c shown in FIG. 11(c), with glass wool 122 interposed between each of the folded-plate roofs 120a to 120c. The Examples correspond to the folded-plate roof 10 equipped with the vibration-damping material 50 described above. The same material as the first folded-plate roof 14 is used for the folded-plate roofs 120a to 120c, and the same material as the glass wool 40 is used for the glass wool 122.

[0046] As shown in Figure 9, Comparative Example 2 (double folded-plate roof), Comparative Example 3 (triple folded-plate roof), and Example (folded-plate roof 10) have greater sound transmission loss than Comparative Example 1 (single folded-plate roof) in all frequency ranges. In other words, Comparative Examples 2, 3, and the Example have higher sound insulation than Comparative Example 1. Furthermore, in the low frequency range of 125 Hz or less, the Example has greater sound transmission loss than Comparative Examples 2 and 3, confirming that it has higher sound insulation.

[0047] Furthermore, as shown in FIG. 10, Comparative Example 2 (double folded-plate roof), Comparative Example 3 (triple folded-plate roof), and Example (folded-plate roof 10) have lower sound pressure levels in all frequency ranges than Comparative Example 1 (single folded-plate roof). That is, it was confirmed that Comparative Example 2, Comparative Example 3, and Example have reduced noise caused by rainfall compared to Comparative Example 1. Furthermore, in the low frequency range of 125 Hz or less, the Example has a lower sound pressure level than Comparative Examples 2 and 3. This confirms that sound in the low frequency range is appropriately reduced by the vibration-damping material 50. Furthermore, in the high frequency range, although the Example has a higher sound pressure level than Comparative Example 3, it is the second lowest value after Comparative Example 3, ensuring sound insulation even in the high frequency range. Furthermore, since the Example has one fewer roof panel than Comparative Example 3, the manufacturing cost and weight are lower than Comparative Example 3.

[0048] [effect] When raindrops caused by rainfall collide with the first folded-plate roof 14, the vibration energy caused by the collision is transmitted to the second folded-plate roof 16 via the fixing device 18, causing the second folded-plate roof 16 to vibrate and generate noise. In response to this, the vibration-damping material 50 containing granular material 54 is interposed between the first folded-plate roof 14 and the second folded-plate roof 16, so the vibration energy transmitted to the second folded-plate roof 16 is transmitted to the granular material 54, causing the granular material 54 to vibrate. As a result, the vibration energy is absorbed by the granular material 54, reducing the noise caused by the vibration of the second folded-plate roof 16. Furthermore, while noise caused by this rainfall also occurs in the low-frequency band, this noise is appropriately reduced by the vibration-damping material 50.

[0049] Furthermore, since glass wool 40 has a high sound absorption property for high-frequency sounds, by interposing glass wool 40 in addition to vibration-damping material 50 between first folded-plate roofing 14 and second folded-plate roofing 16, it is possible to appropriately reduce high-frequency sounds as well. Furthermore, since granular material 54 is filled into bags 52 and placed in recesses 16a of second folded-plate roofing 16 while still filled in said bags 52, construction is facilitated and workability is improved. Furthermore, by setting the specific gravity of the granular material to be in the range of 0.9 to 2.5 and the particle size to be in the range of 0.5 mm to 6.0 mm, vibration energy transmitted to second folded-plate roofing 16 can be efficiently absorbed by granular material 54, thereby improving the sound insulation of the folded-plate roofing 10.

[0050] [Variations] In the above embodiment, the damping material 50 is arranged in the recessed portion 16a of the second folded-plate roof 16, but it may also be arranged in the protruding portion 16b of the second folded-plate roof 16. In other words, the damping material 50 may be arranged without gaps in the width direction of the folded-plate roof 10, similar to the glass wool 40.

[0051] In the above embodiment, the damping materials 50 are arranged without gaps along the longitudinal direction of the folded-plate roof 10, but they do not have to be arranged without gaps along the longitudinal direction. In other words, adjacent damping materials 50 in the longitudinal direction of the folded-plate roof 10 may be arranged with a predetermined gap between them.

[0052] In the above embodiment, the folded plate roof 10 is a double folded plate roof, but it may also be a triple folded plate roof with one more roof plate added. In this case, the vibration-damping material 50 may be interposed between the middle folded plate roof and the bottom folded plate roof of the three folded plate roofs.

[0053] In the above embodiment, the concave and convex shapes of the first folded plate roof 14 and the second folded plate roof 16 are both trapezoidal, but the concave and convex shapes may be formed in a circular arc.

[0054] In the above embodiment, the granular material 54 is filled in the bags 52, but the present invention is not limited to the embodiment in which the granular material 54 is contained in the bags 52. For example, by erecting a plurality of partition plates at predetermined intervals in the recess 16a of the second folded plate roof 16, a plurality of granular material storage chambers may be formed along the longitudinal direction of the recess 16a, and the granular material 54 may be filled in each of these granular material storage chambers.

[0055] In the above embodiment, the first folded plate roof 14 and the second folded plate roof 16 are both formed from the same folded plate 20, but the shapes of the folded plates 20 may be different as long as the first folded plate roof 14 and the second folded plate roof 16 can be arranged to overlap each other. [Explanation of symbols]

[0056] 14: First folded plate roof 16: Second folded plate roof 16a: Recess 18: Fixtures 40: Glass wool (fiber sound-absorbing material) 50: Vibration damping material 52: Bag 54: Granules G: Gap

Claims

1. A first folded plate roof formed in an uneven shape; A second folded plate roof formed in an uneven shape and arranged below the first folded plate roof so as to overlap the first folded plate roof; A fixing device that connects the first folded plate roof and the second folded plate roof while forming a gap between the first folded plate roof and the second folded plate roof; A folded plate roof comprising: a vibration-damping material including granular material and interposed in the gap between the first folded plate roof and the second folded plate roof.

2. The folded plate roof according to claim 1, further comprising a fiber-based sound-absorbing material interposed in the gap between the first folded plate roof and the second folded plate roof.

3. The folded plate roof according to claim 1 or 2, wherein the vibration-damping material is arranged in a recess of the second folded plate roof.

4. The vibration-damping material comprises: the granular material having a specific gravity in the range of 0.9 to 2.5 and a particle size in the range of 0.5 mm to 6.0 mm; and a bag for accommodating the granular material. The folded plate roof according to claim 1.

Images