Ceiling structure

Abstract

To improve workability of a ceiling structure having a sound absorption function.SOLUTION: A ceiling structure 100 includes: a plurality of small beams 110 bridged between upper side large beams 50; a plurality of support members 120 which are bridged between the small beams 110 and are provided at intervals in a beam direction of the small beams 110; a plurality of box members 210 which are aligned in a longitudinal direction of the support members 120 between the support members 120, have a plurality of holes 228 formed in a bottom part 226 constituting a ceiling surface, and have opened upper surfaces; and a plurality of sound absorption parts 202 which are provided in each of the plurality of box members 210 and are composed of a sound absorption material.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a ceiling structure. [Background technology]

[0002] Patent Document 1 discloses a technology relating to sound-absorbing interior materials that are applied to indoor ceilings, walls, etc. to exhibit sound-absorbing functions. In this prior art, the sound-absorbing interior material is constructed by laminating and integrating a sound-absorbing material layer onto the back surface of a punched metal sheet that has a large number of through-holes.

[0003] Patent Document 2 discloses a technology relating to a laminate used as a soundproof / fireproof wall for a house, a building, etc. In this prior art, a fireproof laminate provided with sound absorption properties has a base material made of punched metal and a non-combustible or flame-retardant fibrous sound-absorbing material layer laminated on one or both sides of the base material, and the air permeability of the sound-absorbing material layer is set to 200 cm 3 / cm 2 It is adjusted to less than a second.

[0004] Patent Document 3 discloses a technology relating to a sound-absorbing structure for reducing road traffic noise, etc. In this prior art, the sound-absorbing structure has a layer of glass wool with a low bulk density arranged on the sound source side as a sound-absorbing material, and a layer of glass wool with a high bulk density arranged behind it. The bulk density of both glass wool layers is 16 to 32 kg / m 3 and the bulk specific gravity ratio is 1:1.3~2.

[0005] Patent Document 4 discloses a roof structure, particularly a roof structure using a deck plate that is excellent in fire resistance, heat insulation, sound insulation, and ease of installation. In this prior art, the roof structure is constructed by sequentially laminating sheathing boards, heat insulation material, and waterproofing material on a deck plate fixed to a beam or purlin. The sheathing boards are made of hard wood wool cement boards or hard wood chip cement boards, and the heat insulation material has a thickness of more than 50 mm. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 1-275824 [Patent Document 2] Japanese Patent Application Publication No. 9-111911 [Patent Document 3] Japanese Patent Application Publication No. 11-6223 [Patent Document 4] Japanese Patent Application Laid-Open No. 2016-928 Summary of the Invention [Problem to be solved by the invention]

[0007] There are known ceiling structures that provide sound absorption by providing sound-absorbing materials to the ceiling. However, for example, providing sound-absorbing materials to a large, high-positioned ceiling in an exhibition hall or other large space requires the installation of scaffolding at high altitudes, which increases costs and makes installation difficult, leading to delays in the construction process. Therefore, improvements in installation efficiency are needed.

[0008] In view of the above, an object of the present invention is to improve the ease of construction of a ceiling structure having sound-absorbing properties. [Means for solving the problem]

[0009] The first aspect is a ceiling structure comprising a plurality of small beams suspended between main beams, a plurality of support members suspended between the small beams and spaced apart in the beam direction of the small beams, a plurality of box members arranged in a line between the support members in the longitudinal direction of the support members, each of which has a plurality of holes formed in its bottom and an open top, and a plurality of sound-absorbing sections each made of sound-absorbing material and arranged within each of the box members.

[0010] In the ceiling structure of the first aspect, sound passes through multiple holes formed in the bottom of the box member that forms the ceiling surface, and is absorbed by the sound-absorbing section made of sound-absorbing material. In this way, because the box member has multiple holes formed in the bottom, it is possible to form the sound-absorbing section by constraining the sound-absorbing material without impairing the sound-absorbing performance.

[0011] In addition, since the box members are arranged side by side between the support members that are hung between the small beams, workability is good.In addition, since the box members are arranged side by side between the support members that are hung between the small beams, work can be done from above, and work from below at high places, for example, is not necessary, so workability is good.

[0012] The second aspect is a ceiling structure according to the first aspect, comprising a board material provided on a plurality of the sound-absorbing sections, and a sound-absorbing layer provided on the board material and made of sound-absorbing material.

[0013] In the second aspect of the ceiling structure, board materials are provided on the multiple sound-absorbing sections, and a sound-absorbing layer made of sound-absorbing material is further provided on the board materials. Therefore, sound that passes through the sound-absorbing sections is absorbed and blocked by the board materials and the sound-absorbing layer.

[0014] A third aspect is a ceiling structure described in the second aspect, in which the sub-beam is made of H-shaped steel, the support member is attached to a mounting member provided on the underside of the lower flange of the sub-beam, and the board material is hung over the lower flange of the sub-beam.

[0015] In the ceiling structure of the third aspect, a box member is attached to a support member attached to a mounting member provided below the bottom flange of the sub-joist made of H-shaped steel, and the board material is placed on the top surface of the bottom flange of the subjoist, making it easy to install the board material on top of the sound-absorbing section. Therefore, compared to, for example, cases where a separate member is provided to attach the board material, workability is good. [Effects of the Invention]

[0016] According to the present invention, the ease of construction of a ceiling structure having sound absorbing properties is improved. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a plan view of a building to which an embodiment of the ceiling structure is applied before the ceiling is installed. [Figure 2]1 is a cross-sectional view taken along the Y direction of a building to which an embodiment of the ceiling structure is applied. [Figure 3] 1 is an enlarged cross-sectional view of a main part of a ceiling structure according to an embodiment, taken along the X direction. [Figure 4] 1 is an enlarged cross-sectional view of a main part of a ceiling structure according to an embodiment, taken along the Y direction. [Figure 5] FIG. 2 is an exploded perspective view of a box member of a sound absorbing unit of a ceiling structure according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] <Embodiment> The ceiling structure of one embodiment of the present invention will be described. Two directions perpendicular to the horizontal direction are the X direction and the Y direction, and are indicated by arrows X and Y, respectively. The vertical direction perpendicular to the X direction and the Y direction is the Z direction, and is indicated by arrow Z.

[0019] [structure] First, a specific structure of the ceiling structure of one embodiment will be described.

[0020] The building 10 to which the ceiling structure 100 of this embodiment shown in Figure 2 is applied is an exhibition hall with a large exhibition space 11 inside. However, buildings to which the present invention is applied are not limited to exhibition halls. At the upper end of this building 10, a steel-framed truss structure 20 extending along the X direction is provided at intervals in the Y direction (see also Figure 1). The truss structure 20 of this embodiment is composed of upper girders 50 as upper chord members, lower girders 30 as lower chord members, diagonal members 24, and beam members 26, which are arranged at intervals in the vertical direction. In this embodiment, the upper girders 50 and lower girders 30 are made of H-shaped steel, but this is not limited to this.

[0021] Furthermore, the ceiling 102 to which the ceiling structure 100 is applied is located at a high position above the floor surface 12, approximately 30 m above the floor surface 12 in this embodiment. Furthermore, the roof 104 is provided on the upper girders 50 and the ceiling 102. Note that in Figure 2, the ceiling 102, the roof 104, and joists 110 (described later) are not shown.

[0022] As shown in Fig. 1, steel beams 110 extending in the Y direction are suspended between upper girders 50 spaced apart in the Y direction. A plurality of beams 110 are provided spaced apart in the X direction. Fig. 1 is a plan view of the structure before a sound-absorbing unit 200, which will be described later, is installed.

[0023] As shown in FIG. 3, the sub-beam 110 of this embodiment is made of an H-shaped steel having an upper flange 112, a lower flange 116, and a web 114.

[0024] Here, the upper girder 50 and the sub-beam 110 may be joined in any manner, but in this embodiment they are joined as follows.

[0025] As shown in Figures 1 and 4, a gusset plate 60 is welded to the upper flange 52, lower flange 56 (see Figure 4) and web 54 of the upper girder 50, and the gusset plate 60 and a rib plate 62 (see Figure 1) sandwich the web 114 of the sub-girder 110 and are bolted together.

[0026] As shown in Fig. 1, support members 120 are suspended in the X direction between the bottom flanges 116 of adjacent sub-joists 110 (see Figs. 3 and 4). The support members 120 are also spaced apart in the Y direction (see also Fig. 4). As shown in Fig. 4, in this embodiment, the support members 120 are made of C-channel steel, but the present invention is not limited to this.

[0027] As shown in FIG. 3 , in this embodiment, the support member 120 is attached to a mounting member 150 that is joined, or in this embodiment, welded, to the lower surface 116A of the lower flange 116 of the sub-beam 110. The mounting member 150 has an inverted T shape with a mounting portion 154 along the horizontal direction (X direction) and a joint portion 152 that protrudes upward from the middle of the mounting portion 154. The joint portion 152 of the mounting member 150 is joined to the lower surface 116A of the lower flange 116 of the sub-beam 110. The support member 120, which is made of C-channel steel, is inserted into the mounting portion 154 of the mounting member 150. In this embodiment, the mounting portion 154 of the mounting member 150 and the support member 120 are fastened together with screws 156.

[0028] The height of the upper surface 125 of the support member 120 is adjusted so as to be approximately the same height as the upper surface 116B of the lower flange 116 of the joist 110. Note that in Fig. 3, the height of the upper surface 125 of the support member 120 is shown lower than it actually is, since the thickness of the flange 222 of the box member 210 of the sound absorbing unit 200, which will be described later, is shown thicker than it actually is.

[0029] As shown in Fig. 4, sound absorbing units 200 are provided on support members 120 that are suspended between small beams 110 (see also Fig. 3). The sound absorbing units 200 are arranged in the X and Y directions. The sound absorbing units 200 are also made up of a box member 210 (see Fig. 5) with an open top, and a sound absorbing section 202 that is provided inside the box member 210 and is made of sound absorbing material such as glass wool, rock wool, and urethane foam.

[0030] As shown in FIG. 5, the box member 210 of this embodiment is made of metal and includes a box body 220 having an inverted hat-shaped cross section, and end covers 230 that form the side surfaces.

[0031] The box body 220 is configured to have a flange portion 222, a vertical wall portion 224, and a bottom portion 226. A plurality of holes 228 are formed uniformly on one surface of the bottom portion 226. In this embodiment, the holes 228 are formed by punching. In other words, the bottom portion 226 is made of punched metal (perforated metal).

[0032] The end cover 230 has a flange portion 232, a side wall portion 234, and a folded portion 236 folded inward. The folded portion 236 of the end cover 230 is then placed on the inner surfaces of the vertical wall portion 224 and the bottom portion 226 of the box body 220 and fastened with screws 240 to form the box member 210. Note that although the screws 240 are fastened from the outside in FIG. 5, they may also be fastened from the inside.

[0033] As shown in Fig. 4, the flange portion 222 of the box body 220 constituting the sound absorbing unit 200 is placed on the upper surface portion 125 of the support member 120 made of C-channel steel and fastened together with a board material 300 (described later) with screws (see also Fig. 3). Furthermore, the sound absorbing units 200 adjacent to each other in the X direction have the flange portions 232 of the end covers 230 overlapped and fastened together with screws.

[0034] In this embodiment, the ceiling 102 is made up of a plurality of sound absorbing units 200 arranged in the X and Y directions, and the bottom 226 of the box member 210 forms the ceiling surface.

[0035] 3, a board material 300 is placed on the upper surface 116B of the lower flange 116 of the sub-joists 110 and is hung between the sub-joists 110. It is also placed on the flange 222 on the upper surface 125 of the support member 120, and is fastened to the support member 120 together with the flange 22 with screws as described above.

[0036] 3 and 4, in this embodiment, the board material 300 is configured by stacking two reinforced gypsum boards 302A and 302B, but is not limited to this. However, it is desirable that the board material 300 has excellent heat insulation and sound insulation properties. A sound absorbing layer 310 made of sound absorbing materials such as glass wool, rock wool, and urethane foam is provided on the board material 300.

[0037] Therefore, there is a gap between the sound absorbing portion 202 of the sound absorbing unit 200 and the board material 300, and a space, that is, an air layer 290 (see FIG. 4) is formed between the two.

[0038] 3 and 4, a roof 104 is provided on top of the joists 110 and the upper girder 50 (see FIG. 4). Therefore, the board material 300 and the sound absorbing layer 310 are provided in the space 292 between the sound absorbing part 202 of the sound absorbing unit 200 and the roof 104 provided on top of the upper girder 50.

[0039] The roof 104 of this embodiment is fixed onto a tubular steel frame 400 (see FIG. 3) with a generally rectangular cross section that is hung across the upper flanges 112 of the joists 110. The roof 104 of this embodiment is also constructed by laminating a corrugated deck plate 410 (see FIG. 4), sheathing boards 412, heat insulating material 414, and a waterproof sheet 416, but is not limited to this.

[0040] [Construction method] Next, an example of the construction method will be described.

[0041] As shown in Fig. 3, a mounting member 150 is welded in advance to the underside 116A of the bottom flange 116 of the sub-beam 110 made of H-shaped steel. As shown in Fig. 3, a support member 120 made of C-channel steel is attached to the mounting member 150 and fixed with screws, so that the support member 120 spans between the sub-beams 110. The plan view of Fig. 1 shows the state after the construction process up to this point has been completed.

[0042] 3, the flange portions 222 of the box body 220 of the box member 210 that constitutes the sound absorbing unit 200 are placed on top of the support member 120. The flange portions 232 of adjacent end covers 230 are also overlapped. Note that the box member 210 has the box body 220 and the end covers 230 assembled in advance.

[0043] Then, as shown in FIG. 4, sound absorbing material is filled into each box member 210 from above (from the upper opening) to form sound absorbing section 202.

[0044] The sound absorbing units 200 are arranged between the support members 120 in the longitudinal direction of the support members 120, i.e., in the X direction. As for the construction method, the sound absorbing sections 202 may be formed after all the box members 210 have been installed, or the sound absorbing sections 202 may be formed sequentially while the box members 210 are being installed.

[0045] 3, the board material 300 is placed on the upper surface 116B of the flange 116 of the joist 110 from above, and fastened with screws. Then, a sound absorbing material is laid on the board material 300 to form the sound absorbing layer 310.

[0046] As described above, the sound absorbing unit 200 is completed by attaching the box member 210 to the support member 120 and then filling it with sound absorbing material, but this is not limited to this. For example, the sound absorbing material may be filled in the box member 210 beforehand to form the sound absorbing unit 200, and the sound absorbing unit 200 may then be attached to the support member 120. Alternatively, the box member 210 and the box main body 220 may be assembled separately. In other words, the box main body 220 may first be attached to the support member 120, and the end cover 230 may be fastened with screws 240 to the box main body 220 attached to the support member 120.

[0047] [Action and effect] Next, the operation and effects of this embodiment will be described.

[0048] In the ceiling structure 100 of this embodiment, sound generated in the exhibition space 11 passes through multiple holes 228 formed in the bottom 226 that constitutes the ceiling surface of the box member 210, and is absorbed by the sound absorbing section 202. In this way, because the box member 210 has multiple holes 228 formed in the bottom 226, the sound absorbing section 202 can be formed by constraining the sound absorbing material without impairing the sound absorbing performance. Furthermore, the box member 210 suppresses deformation of the sound absorbing section 202 due to water absorption, etc., so the sound absorbing effect can be stably exerted.

[0049] Furthermore, since the box members 210 are arranged side by side between the support members 120 that are hung between the small beams 110, workability is good. Furthermore, since the box members 210 are arranged side by side between the support members 120 that are hung between the small beams 110, work can be done from above. Furthermore, the sound absorbing material can be filled in through the opening at the top of the box members 210 to form the sound absorbing section 202.

[0050] Furthermore, because the box body 220 of the sound absorbing unit 200 has an inverted hat-shaped cross section, by placing the flange portion 222 of the sound absorbing unit 200 on the support member 120, the lower end of the support member 120 and the bottom portion 226 of the sound absorbing unit 200 can be made flush or nearly flush with each other. Therefore, when viewed from below, the appearance of the ceiling 102 is neat with few irregularities, improving the design of the ceiling 102.

[0051] Here, the building 10 of this embodiment is an exhibition hall with a large exhibition space 11 inside. Furthermore, the ceiling 102 is located high above the floor 12. It is difficult to work from below a ceiling that is located in such a large space and at such a high altitude. However, as mentioned above, the ceiling structure 100 of this embodiment is preferable because it allows work only from above, eliminating the need for work from below.

[0052] Furthermore, other than the support member 120 made of C-channel steel, no significant additional components are required, and workability can be improved while ensuring sound insulation and sound absorption.

[0053] Furthermore, in the ceiling structure 100 of this embodiment, board materials 300 are provided at intervals on the sound absorbing sections 202 of the multiple sound absorbing units 200, and a sound absorbing layer 310 made of sound absorbing material is further provided on the board materials 300. In other words, the configuration is such that the board materials 300 and the sound absorbing layer 310 are located on the sound absorbing sections 202 with an air layer 290 sandwiched between them. Therefore, sound and the like that passes through the sound absorbing sections 202 is absorbed and blocked by the air layer 290, the board materials 300, and the sound absorbing layer 310. Note that providing the air layer 290 improves sound absorption, particularly in the mid-to-low frequency range.

[0054] Furthermore, by making the sound absorbing unit 200 box-shaped, it is possible to easily provide an air layer 290 between the sound absorbing portion 202 and the board material 300, which is important for sound absorption.

[0055] From another perspective, the board material 300 and the sound absorbing layer 310 are provided in the space 292 between the sound absorbing unit 200 and the roof 104 provided on the upper girder 50. Therefore, the sound that passes through the sound absorbing section 202 is blocked and absorbed by the air layer 290, the board material 300, and the sound absorbing layer 310, effectively preventing sound from leaking outdoors.

[0056] Furthermore, in the ceiling structure 100 of this embodiment, the box member 210 is provided on the support member 120 attached to the mounting member 150 provided on the underside 116A of the bottom flange 116 of the beam 110 made of H-shaped steel, and the board material 300 is placed on the top side 116B of the bottom flange 116 of the beam 110, so that the board material 300 can be easily provided at a distance above the sound absorbing portion 202 of the sound absorbing unit 200. Therefore, compared to, for example, a case where a separate member is provided to attach the board material 300, workability is improved.

[0057] <Other> The present invention is not limited to the above embodiment.

[0058] For example, in the above embodiment, the box member 210 has the plurality of holes 228 formed only in the bottom 226, but this is not limited to this. The holes 228 may also be formed in the vertical wall portion 224 and the side wall portion 234. Furthermore, in the above embodiment, the holes 228 are formed by punching, but this is not limited to this. For example, the bottom or the entire box member may be made of a mesh member, such as a wire mesh. In other words, the mesh of the wire mesh becomes the plurality of holes that allow sound to pass through.

[0059] Also, for example, in the above embodiment, board materials 300 are provided at intervals on the sound absorbing portions 202 of the multiple sound absorbing units 200, and a sound absorbing layer 310 made of sound absorbing material is further provided on this board material 300. In other words, the board material 300 and the sound absorbing layer 310 are located on the sound absorbing portions 202 with an air layer 290 sandwiched between them. However, this configuration is not limited to this. The sound absorbing portions 202 may be formed by filling the sound absorbing material up to the top end of the sound absorbing unit 200 (box member 210), and there may be no or almost no gap between the sound absorbing portions 202 and the board material 300. Note that even in this configuration with no or almost no air layer 290, the sound absorbing portions 202 are thick, so they can absorb mid- to low-frequency sounds.

[0060] Furthermore, for example, in the above embodiment, the girder is the upper girder 50 that constitutes the truss frame 20, but this is not limited to this. A sub-girder may be placed across the lower girder 30 that constitutes the truss frame 20, and a support member may be provided on this sub-girder to attach the sound-absorbing unit 200.

[0061] Furthermore, for example, in the above embodiment, the building 10 to which the ceiling structure 100 is applied is an exhibition hall having a large exhibition space 11 inside, but this is not limited to this. The present invention can be applied to any building. For example, the ceiling structure of the present invention can be applied to buildings that do not have a truss frame.

[0062] Furthermore, for example, in the above embodiment, the building 10 to which the present invention is applied is a steel-framed building, but the present invention is not limited to this. For example, the present invention can also be applied to buildings made of steel-framed reinforced concrete, reinforced concrete and wood, or a combination of these.

[0063] Furthermore, the present invention can be embodied in various forms without departing from the spirit of the present invention. [Explanation of symbols]

[0064] 50 Upper girder (example of girder) 100 Ceiling structure 110 Small beam 116 Lower flange 120 Support member 150 Mounting material 202 Sound absorbing section 210 Box material 226 Bottom 228 holes 300 board material 310 Sound-absorbing layer

Claims

1. There are several small beams spanning between the main beams, A plurality of support members are provided between the sub-beams and spaced apart in the beam direction of the sub-beams; a plurality of box members arranged between the support members in a longitudinal direction of the support members, the box members having a plurality of holes formed in the bottom and an open top, the box members forming a ceiling surface; a plurality of sound absorbing sections each provided in the plurality of box members and made of a sound absorbing material; Equipped with the box member has a first flange portion that protrudes from a top of a side wall portion that rises from the bottom portion toward the support member, and a second flange portion that protrudes in a longitudinal direction of the support member, The first flange portion is placed on the support member, The second flange portion is overlapped with the adjacent second flange portion, and both end portions thereof are placed on the support member. Ceiling structure.

2. A plurality of small beams spanning between the main beams; A plurality of support members are provided between the sub-beams and spaced apart in the beam direction of the sub-beams; a plurality of box members arranged between the support members in a longitudinal direction of the support members, the box members having a plurality of holes formed in the bottom and an open top, the box members forming a ceiling surface; a plurality of sound absorbing sections each provided in the plurality of box members and made of a sound absorbing material; a board material provided on the plurality of sound absorbing portions; a sound absorbing layer provided on the board material and made of a sound absorbing material; A ceiling structure equipped with

3. The small beam is made of H-shaped steel, The support member is attached to a mounting member provided on the lower surface of the lower flange of the sub-beam, The board material is hung over the lower flange of the small beam. The ceiling structure according to claim 2.

4. The support member is made of C-channel steel, The first flange portion is placed on the upper surface of the support member, and the bottom and the lower surface of the support member are flush or approximately flush with each other. The ceiling structure according to claim 1 .

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