Soundproofing fittings and suspended ceiling structure

Abstract

To provide a highly versatile and highly sound-insulating metal fitting applicable to diverse types of suspended ceiling structures.SOLUTION: A sound-insulating metal fitting 2 is fitted on an end of a brace 8 of a suspended ceiling structure 1 having a ceiling joist receiving part 14 and a ceiling joist 15 that are suspended from a floor slab 11. Furthermore, the sound-insulating metal fitting includes a first member fixed on the ceiling joist receiving part 14, a second member fixed on a bottom end of the brace, and a sound insulating function part interposed between the first and second members. Here, one of the first and second members is formed in a columnar shape while the other is formed in a cylindrical form that surrounds the columnar-shaped member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sound-insulating metal fitting that is attached to the end of an inclined member of a suspended ceiling structure having a ceiling substrate suspended from a structural body such as a building, and to the suspended ceiling structure to which the metal fitting is attached. [Background technology]

[0002] For example, as disclosed in Patent Documents 1-3, earthquake-resistant reinforcement metal fittings are known that reinforce suspended ceiling structures having rafter supports and rafters suspended from building structures such as floor slabs or beams at the intersections between the rafter supports and rafters. Here, in addition to conventional steel-based ceilings formed by rafter supports and rafters, various types of ceiling substrates known as system ceilings are known as suspended ceiling structures.

[0003] The suspended ceiling structures disclosed in Patent Documents 1 to 3 have earthquake-resistant braces placed inside the ceiling. Specifically, the lower ends of four diagonally placed braces are connected to a single earthquake-resistant reinforcing bracket attached to the intersection of the rafter support and the rafter.

[0004] Furthermore, as disclosed in Patent Document 4, vibration-isolating members are sometimes placed to prevent noise caused by vibrations generated by vehicle traffic, walking, etc. in the structure supporting the suspended ceiling being transmitted to the ceiling panels via the suspension bolts and braces. This document discloses a configuration in which vibration-isolating hangers are attached midway on the suspension bolts, and vibration-isolating members are attached midway on the braces. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4963484 [Patent Document 2] Patent No. 4845212 [Patent Document 3] Patent No. 6290167 [Patent Document 4] Japanese Patent Application Laid-Open No. 2009-2435 Summary of the Invention [Problem to be solved by the invention]

[0006] However, while the earthquake resistance performance of earthquake-resistant reinforced ceilings has been confirmed, the reality is that the sound insulation performance that is added as an additional function has not been sufficiently confirmed through experiments.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sound-insulating metal fitting that is highly versatile and applicable to a variety of suspended ceiling structures, and that has high sound insulation properties, as well as a suspended ceiling structure to which the metal fitting is attached. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the sound-insulating fitting of the present invention is a sound-insulating fitting that is attached to the end of an inclined member of a suspended ceiling structure having a ceiling substrate suspended from a structure, and comprises a first member that is fixed to the ceiling substrate or the structure, a second member that is fixed to the end of the inclined member, and a sound-insulating functional part that is interposed between the first member and the second member, and is characterized in that one of the first member and the second member is formed in a columnar shape and the other is formed in a tubular shape that surrounds the first member.

[0009] Here, the first member and the second member may be configured such that one of them has a shaft portion formed in a columnar shape at the center of a flat plate portion, and the other has a sheath tube portion formed in a cylindrical shape surrounding the periphery of the shaft portion, and a vibration-damping material serving as the sound-insulating functional portion is interposed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the sheath tube portion, and acoustic insulation is provided between the flat plate portion and the end face of the sheath tube portion. Also, it is preferable that the sheath tube portion is provided with attachment pieces for connecting the ends of the plurality of diagonal members.

[0010] The invention also provides a suspended ceiling structure having a ceiling substrate suspended from a structure, the suspended ceiling structure comprising any of the sound-insulating metal fittings described above and a diagonal member having one end fixed to the sound-insulating metal fitting, the diagonal member connecting the structure and the ceiling substrate via the sound-insulating metal fitting. Here, the ceiling substrate may be suspended by a suspension bolt equipped with an anti-vibration hanger. [Effects of the Invention]

[0011] The sound-insulating metal fittings of the present invention, configured as described above, are attached to the ends of diagonal members in a suspended ceiling structure with a ceiling substrate such as a conventional steel-based ceiling. That is, the first member of the sound-insulating metal fitting is attached to the ceiling substrate, and the other, the second member, is attached to the end of the diagonal member. A sound-insulating functional part is then provided between the first and second members.

[0012] In this way, if it is interposed between the end of the diagonal member and the ceiling substrate, it can be installed regardless of the shape of the diagonal member, making it highly versatile and applicable to various suspended ceiling structures to improve sound insulation.

[0013] Furthermore, such sound-insulating metal fittings can be easily manufactured by covering the shaft portion formed in the center of the flat plate with a sheath tube portion and placing vibration-damping material between the shaft portion and the sheath tube portion.

[0014] Furthermore, if multiple mounting pieces are provided on the sheath pipe section, sound-insulating metal fittings can be placed at points where multiple diagonal members such as braces are concentrated, allowing a single fitting to provide sound-insulating functionality to multiple diagonal members.

[0015] In a suspended ceiling structure suspended from a structural member, sound insulation can be easily achieved by attaching sound-insulating fittings to the ends of the diagonal members connecting the structural member to the ceiling substrate. In particular, when the ceiling substrate is suspended by suspension bolts equipped with vibration-isolating hangers, the diagonal members do not bear the weight of the ceiling panels, etc., so the sound-insulating performance of the vibration-isolating hangers can be fully demonstrated. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a side view illustrating the configuration of the suspended ceiling structure of the present embodiment. [Figure 2] FIG. 2 is a perspective view illustrating the configuration of a suspended ceiling structure. [Figure 3] FIG. 2 is an exploded perspective view illustrating the configuration of the sound-insulating metal fitting according to the present embodiment. [Figure 4] FIG. 2 is an explanatory diagram showing the configuration of the outer member of the sound-insulating metal fitting. [Figure 5] FIG. 1 is a perspective view illustrating the configuration of a sound-insulating metal fitting according to an embodiment of the present invention. [Figure 6] FIG. 2 is an exploded perspective view illustrating the configuration of the reinforcing metal fitting. [Figure 7] FIG. 2 is a perspective view illustrating the configuration of a reinforcing metal fitting. [Figure 8] FIG. 10 is a perspective view illustrating a state in which a reinforcing metal fitting is attached to an intersection portion. [Figure 9] FIG. 10 is a plan view illustrating the state in which the sound-insulating metal fitting is attached to the reinforcing metal fitting. [Figure 10] FIG. 10 is a cross-sectional view taken along the arrow AA in FIG. 9. [Figure 11] 10 is a cross-sectional view taken along the arrow BB in FIG. 9. [Figure 12] 1 is an explanatory diagram showing a schematic diagram of the state of the suspended ceiling structure of the present embodiment. FIG. [Figure 13] FIG. 1 is an explanatory diagram showing, in model form, four evaluation test specimens used in an experiment conducted to confirm the sound insulation properties of the suspended ceiling structure of this embodiment. [Figure 14]FIG. 1 is an explanatory diagram comparing the experimental results of two evaluation specimens. [Figure 15] FIG. 10 is an explanatory diagram comparing the experimental results of two other evaluation specimens. [Figure 16] 1 is an explanatory diagram showing a schematic configuration of a suspended ceiling structure according to a first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 are diagrams illustrating the configuration of a suspended ceiling structure 1 according to this embodiment. Figures 3 to 5 are diagrams illustrating the configuration of a sound-insulating metal fitting 2 according to this embodiment.

[0018] The suspended ceiling structure 1 is installed in various buildings, such as gymnasiums, assembly halls, public facilities that serve as bases for disaster emergency response measures, buildings, etc. The suspended ceiling structure 1 of this embodiment can be applied to both existing suspended ceilings and newly constructed suspended ceilings.

[0019] As shown in Figure 1, multiple suspension bolts 13 are hung at intervals from the underside of the floor slab 11 and beams that form the structural body of the building, and the siding support part 14 that forms the ceiling substructure is hung from the hanger 131 at the lower end of the suspension bolt 13 that serves as the suspension member.

[0020] 2, the siding members 15 that constitute the ceiling underlayment are attached at intervals in the axial direction of the siding support members 14, facing in a direction that is approximately perpendicular to the siding support members 14. Note that, although this embodiment will be described using as an example a ceiling underlayment formed by the siding support members 14 and the siding members 15, application is not limited to this. For example, the sound-insulating fittings 2 of this embodiment can also be applied to a system ceiling equipped with a ceiling underlayment made of T-bars arranged in a lattice pattern.

[0021] A ceiling board 16 such as a gypsum board is attached to the underside of the rough edge 15. As shown in Fig. 1, if the end 16a of the ceiling board 16 is spaced apart from the wall surface 12 of the building by a predetermined distance or more, the end 16a can be prevented from being pressed against the wall surface 12 and being damaged by shaking during an earthquake.

[0022] In this embodiment, a case will be described in which diagonal members such as braces are placed in a manner that does not impair sound insulation for earthquake reinforcement of a suspended ceiling suspended by suspension bolts 13 equipped with vibration-isolating hangers 7. In short, even if sound insulation is ensured by suspending with suspension bolts 13 equipped with vibration-isolating hangers 7, if the braces placed afterwards do not have sound insulation properties, those braces will become sound bridges and the sound insulation provided by the vibration-isolating hangers 7 will be impaired.

[0023] As shown in Figure 2, the suspended ceiling structure 1 of this embodiment comprises a pair of braces 8, 8 as diagonal members in the soffit support direction, arranged in an approximately V-shape in side view along the axial direction of the soffit support portion 14, which is the first component of the ceiling substructure, and a pair of braces 8, 8 as diagonal members in the soffit direction, arranged in an approximately V-shape in side view along the axial direction of the soffit portion 15, which is the second component of the ceiling substructure.

[0024] The upper end of the brace 8 is fixed to the top of the hanging bolt 13 via a mounting bracket 81. Meanwhile, a reinforcing bracket 3, which will be described later, is attached to the intersection 17A between the siding support portion 14 and the siding portion 15. The lower end of the brace 8 is then attached to the sound-insulating bracket 2 attached to the reinforcing bracket 3.

[0025] As shown in Figure 3, the sound-insulating metal fittings 2 are mainly composed of an inner member 21 which serves as the first or second member, an outer member 22 which serves as the second or first member, and a vibration-damping material 23 which serves as a sound-insulating functional part interposed between the inner member 21 and the outer member 22.

[0026] The inner member 21 includes a shaft portion 212 formed in a columnar shape at the center of a flat plate portion 211. Fig. 4 shows a plan view and two side views of the inner member 21. The inner member 21 includes the flat plate portion 211 that is rectangular in plan view, such as a square, and the shaft portion 212 that protrudes upward from the center of the flat plate portion 211.

[0027] Bolt holes 215 are drilled in each corner of the flat plate portion 211. These bolt holes 215 are holes for fixing the inner member 21 to a reinforcing metal fitting 3, which will be described later. The shaft portion 212 of the inner member 21 can be formed, for example, from a rectangular steel pipe. In addition, by closing the upper end opening of the square steel pipe with an upper cover portion 213, the rigidity of the shaft portion 212 can be increased.

[0028] 3, a square cylindrical vibration-damping material 23 is attached around the shaft portion 212 of the inner member 21. The vibration-damping material 23 is formed of vibration-damping rubber or the like. The vibration-damping material 23 does not have to be formed in a square cylindrical shape, and may be formed, for example, in a rectangular sheet shape that is attached to each of the four side surfaces of the shaft portion 212.

[0029] The outer member 22 is formed in a cylindrical shape surrounding the shaft portion 212 of the inner member 21 and the vibration-damping material 23, and is mainly composed of a square cylindrical sheath tube portion 221 and a plurality of mounting pieces 222 for attaching the lower end of the brace 8.

[0030] The mounting pieces 222 extend from the corners of the sheath tube portion 221, and the extension directions of the four mounting pieces 222 intersect at right angles at the center of the sheath tube portion 221. In addition, the mounting pieces 222 are each drilled with a mounting hole 222a into which a fixing bolt or the like is inserted.

[0031] 5 shows a perspective view of the sound-insulating metal fittings 2 with the vibration-damping material 23 and the outer member 22 attached to the inner member 21. When the suspended ceiling structure 1 is in its normal state, a gap is generated between the lower end surface of the sheath pipe portion 221 of the outer member 22 and the upper surface of the flat plate portion 211 of the inner member 21, providing acoustic insulation.

[0032] The size of the sheath tube portion 221 is set according to the thickness of the vibration-damping material 23 to be interposed between it and the shaft portion 212. By interposing the vibration-damping material 23 between the outer peripheral surface of the shaft portion 212 and the inner peripheral surface of the sheath tube portion 221, it is possible to suppress the transmission of micro-vibrations and the like between the brace 8 and the reinforcing metal fitting 3. In short, as long as acoustic insulation is achieved between the brace 8 and the reinforcing metal fitting 3, a simple gap may be provided between the shaft portion 212 and the sheath tube portion 221.

[0033] The following provides an example of the details of the reinforcing metal fittings 3 used to attach the sound-insulating metal fittings 2 to the intersections 17A between the soffit receiving portions 14 and 15. The sound-insulating metal fittings 2 are not limited to being attached to the soffit receiving portions 14 via the reinforcing metal fittings 3, but can be adapted to any suspended ceiling by modifying the reinforcing metal fittings appropriately according to the components of the ceiling substrate. Furthermore, regardless of the type of suspended ceiling, the interposition of the reinforcing metal fittings 3 can increase the joint strength of the intersections 17A.

[0034] As shown in Figures 6 to 8, the reinforcing metal fittings 3 are attached to the intersection 17A between the sill support portion 14 and the sill portion 15. The lower ends of the braces 8 are connected to the reinforcing metal fittings 3 via the sound-insulating metal fittings 2.

[0035] The sill support portion 14 onto which the hanger 131 of the hanging bolt 13 is hooked is formed in a roughly U-shape in cross section, as shown in Figure 6, by an upper flange 141 that forms the upper end surface of a roughly horizontal plane, a lower flange 142 that is roughly parallel to it, and a web 143 that is roughly vertical and connects the side edges of the upper flange 141 and the lower flange 142.

[0036] On the other hand, the siding part 15 fixed to the siding support part 14 is formed by a bottom part 153, side wall parts 152, 152 rising from both sides of the bottom part 153, and lip parts 151, 151 bent twice inward from the upper edges of each of the side wall parts 152, 152. In other words, a steel material having a generally U-shaped cross section and having lip parts 151, 151 can be used for the siding part 15. In addition, the lip part 151 is formed by the upper surface and the hanging surface into a generally L-shaped cross section facing horizontally.

[0037] As shown in Figures 6-8, the reinforcing bracket 3 is mainly composed of a first bracket 4 that is fixed to the sill support portion 14 located above, and a second bracket 5 that is placed across the first bracket 4 and fixed to the sill portion 15.

[0038] The first metal fitting 4 is mainly composed of a bent portion 41 located in the center and spanning the sill receiving portion 14, a notched portion 42 formed at the bottom so that the sill portion 15 can be fitted into it, and a screw material 43 as a joining means for fixing the first metal fitting 4 to the sill receiving portion 14.

[0039] 6, the bent portion 41 is formed in a generally gate-shaped cross section so as to cover the siding support portion 14 from above. In other words, the bent portion 41 is formed in a shape that covers both sides of the upper flange 141 and the web 143 of the siding support portion 14.

[0040] The lower portion of the bent portion 41 is provided with a notch 42 cut into a shape that allows the upper portion of the edge portion 15 to fit therein. In other words, the notch 42 surrounds the upper and both sides of the edge portion 15.

[0041] The bent portion 41 formed in this manner is placed on the upper flange 141 of the sill receiving portion 14, and the cutout portion 42 is fitted into the sill portion 15 below it, thereby placing the first fitting 4 on the upper end of the side wall portions 152, 152.

[0042] Furthermore, on both sides of the bent portion 41, screws 43, 43 are continuously passed through the web 143 of the soffit receiving portion 14 and the first metal fitting 4 to join them together. As a result, the first metal fitting 4 is fixed to the soffit receiving portion 14.

[0043] In this way, by using the screws 43 that penetrate both the first metal fitting 4 and the siding support 14 as the joining means, a strong joint can be achieved due to the shear resistance of the screws 43. In other words, if the screws 43 that penetrate the first metal fitting 4 are screwed directly into the web 143 of the siding support 14, a strong joint can be achieved that does not slip between the siding support 14 and the first metal fitting 4. In this state, even if the siding support 14 and the siding support 15 are not joined, movement of the first metal fitting 4 in directions other than the axial direction of the siding support 15 is limited.

[0044] Furthermore, ribs 44, 44 protrude from both axial edges of the sill receiving portion 14 of the first fitting 4 in a direction substantially parallel to the axial direction of the sill portion 15. These ribs 44, 44 can increase the rigidity of the first fitting 4, which is manufactured by bending a plate material such as a steel plate.

[0045] In this way, the second fitting 5 is placed over the first fitting 4 attached to the siding support portion 14. The second fitting 5 has a pair of plate portions (51, 52) that face each other across one lip portion 151 of the siding portion 15.

[0046] The pair of plate portions (51, 52) are formed of steel plates or the like with central grooves 511, 521 so that they can straddle the soffit receiving portion 14. Here, the plate portion arranged on the lip portion 151 side (inside the soffit portion 15) is referred to as the lip portion side plate portion 51, and the plate portion arranged on the outside of the soffit portion 15 is referred to as the stop plate portion 52.

[0047] The pair of plate portions (51, 52) are provided with stage portions 53A, 53B extending in opposite directions from the upper edges of the respective plates to form flat surfaces while contacting the upper flange 141 that forms the upper end surface of the sill support portion 14. Here, the flat surface provided on the lip portion side plate portion 51 is referred to as stage portion 53A, and the flat surface provided on the stop plate portion 52 is referred to as stage portion 53B.

[0048] The stage portion 53A is formed with a recess 532A that continues to the groove 511 provided in the center of the lip side plate portion 51 so that the siding support portion 14 can be straddled. On the other hand, the stage portion 53B is formed with a recess 532B that continues to the groove 521 provided in the center of the stop plate portion 52 so that the siding support portion 14 can be straddled.

[0049] The recesses 532A, 532B provided in each of the pair of stage portions 53A, 53B form a continuous rectangular space as shown in Fig. 7. The space formed by these recesses 532A, 532B accommodates the upper surface of the bent portion 41 of the first fitting 4. In short, the stage portions 53A, 53B and the upper surface of the bent portion 41 form a wide, approximately flush rectangular plane on the soffit support portion 14.

[0050] Mounting holes 531 are drilled in the vertical direction near the corners of the wide rectangular plane formed by the pair of stage portions 53A, 53B so as to protrude from the upper flange 141. In this embodiment, an example will be described in which four mounting holes 531 are provided at each corner.

[0051] 6 and 7, a hook portion 512 having a generally V-shaped configuration in side view is provided on the lower portion of the lip side plate portion 51. The hook portion 512 is provided at a position where it can be hooked onto the lip portion 151 from below.

[0052] The hook portion 512 is formed by cutting a rectangular portion of the lower part of the lip side plate portion 51 into the upper and both side edges and tilting it toward the lip portion 151 (see FIG. 10).

[0053] 6 to 8, an insertion hole 513 is drilled above the hook portion 512, and a bolt portion 54 passes through the insertion hole 513, sandwiching the lip portion 151. The bolt portion 54 passes from the lip portion side plate portion 51 toward the insertion hole 523 of the retaining plate portion 52, and a nut is attached to the tip that protrudes toward the retaining plate portion 52.

[0054] 8, a washer 55 formed of a rectangular (approximately square) steel plate or the like is disposed on the head side of the bolt 54. That is, the fastening force introduced between the lip side plate 51 and the retaining plate 52 by tightening the bolt 54 is transmitted through the contact surface between the washer 55 and the lip side plate 51.

[0055] 10, ribs 514 may be formed to protrude from the side edges of the lip side plate 51 in order to restrict the rotation of the washer 55. In this case, ribs 514, 514 protrude from both axial edges of the siding 15 of the lip side plate 51 in a direction substantially parallel to the axial direction of the siding support 14. The ribs 514, 514 can increase the rigidity of the lip side plate 51, which is manufactured by bending a plate material such as a steel plate.

[0056] Furthermore, as shown in Figure 8, rib portions 522, 522 can be extended from both axial edges of the sill portion 15 of the retaining plate portion 52 in a direction approximately parallel to the axial direction of the sill support portion 14 to increase rigidity.

[0057] When a fastening force is introduced between the plate portions (51, 52) by the bolt portion 54, the lip portion 151 is crushed, and the second fitting 5 is fixed to the edge portion 15. In other words, when the fastening force of the bolt portion 54 is transmitted to the lip portion side plate portion 51 via the washer portion 55, the lip portion 151 in contact therewith is deformed and crushed.

[0058] The second fitting 5 is crimped by the introduced fastening force and the deformed lip portion 151, and movement of the siding portion 15 in the axial direction is restricted. In addition, the lip side plate portion 51 and the stop plate portion 52, which are formed in a gate shape and straddle the first fitting 4 and the siding support portion 14, also restrict movement of the siding portion 15 of the second fitting 5 in the axial direction.

[0059] Furthermore, although not shown, it is preferable that the first metal fitting 4 fixed to the sill support portion 14 and the second metal fitting 5 straddling the first metal fitting 4 and fixed to the sill portion 15 are joined by an integration means.

[0060] For example, a joining piece may protrude substantially perpendicularly from the lip side plate portion 51 and be positioned along the outer surface of the bent portion 41 of the first fitting 4, and screws may be screwed in as a means for joining the first fitting 4 and the second fitting 5. In particular, by using multiple screws as a means for joining the first fitting 4 and the second fitting 5 together, the joining strength is increased compared to when they are joined together with a single screw, and the unity of the two can be further improved.

[0061] In this way, the intersection 17A between the sill receiving portion 14 and the sill portion 15 can be fixed by the highly rigid reinforcing metal fitting 3. Simply by attaching this reinforcing metal fitting 3, the joint strength of the intersection 17A is increased and reinforced.

[0062] In addition, the stage portions 53A, 53B of the reinforcing bracket 3, to which force from the brace 8 is transmitted, are in contact with the upper flange 141 of the soffit support portion 14, so even if a load acts from above, it can be supported by the reaction force of the soffit support portion 14.

[0063] 2, reinforcing clips 6 and clips 61 are attached to intersections other than intersection 17A where reinforcing bracket 3 is attached. Reinforcing clip 6 can connect siding support portion 14 and siding portion 15 more firmly than a normal clip 61 attached to an intersection between siding support portion 14 and siding portion 15 where reinforcing bracket 3 is not attached.

[0064] The sound-insulating metal fitting 2 is attached to the stage portions 53A and 53B of the reinforcing metal fitting 3 attached to the intersection 17A in the above manner. Figures 9 to 11 are plan views and cross-sectional views illustrating the state in which the sound-insulating metal fitting 2 is attached to the reinforcing metal fitting 3.

[0065] Bolt holes 215 are drilled in the corners of the flat plate portion 211 of the inner member 21 that constitutes the lower part of the sound-insulating metal fitting 2 at positions that overlap with the mounting holes 531 of the stage portions 53A and 53B (see FIG. 5). The inner member 21 can be fixed to the reinforcing metal fitting 3 by passing a bolt 24 through the bolt hole 215 and the mounting hole 531 (see FIG. 8) and fastening it with a nut 241. If the mounting holes 531 of the stage portions 53A and 53B have an internal thread groove, the inner member 21 can be fixed by the bolt 24 that is screwed in from above, without using a nut.

[0066] The mounting pieces 222 of the outer member 22, which are attached so as to surround the shaft portion 212 of the inner member 21, extend from each corner portion of the sheath tube portion 221 of the outer member 22 in the axial direction of the sill receiving portion 14 and the sill portion 15, respectively.

[0067] 10 and 11, arm members 82 are attached obliquely to the mounting pieces 222 extending in the axial direction by bolts 821. The lower ends of the braces 8 are joined to the arm members 82.

[0068] The arm material 82 is formed in a generally L-shaped cross section for attaching the lower ends of the braces 8. In this way, the lower ends of the four braces 8 arranged in two directions in a generally V-shape when viewed from the side can be attached together to a single sound-insulating metal fitting 2.

[0069] Furthermore, by interposing the sound-proofing metal fittings 2, it is possible to prevent vibrations and sounds generated on the structural body side, such as the floor slab 11, from being transmitted via the braces 8 to the space below the ceiling boards 16. Conversely, it is also possible to prevent sounds generated in the space below the ceiling boards 16 from being transmitted via the braces 8 to upper floors, etc.

[0070] Furthermore, by providing the sound-insulating brackets 2 to the reinforcing brackets 3 attached to the intersection 17A between the siding support 14 and the siding 15, the installation locations are consolidated, reducing the number of parts used and improving workability. In other words, compared to the case where vibration-damping members are interposed in each of the four braces 8, it is only necessary to install the sound-insulating brackets 2 in one location at the intersection 17A, which significantly reduces the number of parts and is therefore more rational.

[0071] Next, the state of the sound-insulating fittings 2 will be explained with reference to the schematic diagram of the construction procedure for the suspended ceiling structure 1 shown in Figure 12. The suspended ceiling structure 1, which is suspended by suspension bolts 13, which are elastic axial force members, can be represented as a model in which the suspension bolts 13 and braces 8 are set by axial stiffness.

[0072] The state shown on the left side of Figure 12 is a model of the state before the ceiling board 16 is attached to the siding (not shown) supported by the siding support 14 that forms the ceiling foundation. Here, the overall axial stiffness of the hanging bolt 13 is set as a series connection of hanging members with axial stiffness 2k1 sandwiching the vibration-proof hanger 7 with low axial stiffness k3, and the vertical component of the axial stiffness of the brace 8 is k 2v Here, as shown in the enlarged view on the left, the connection between the brace 8 and the ceiling substrate is premised on the presence of sound-insulating metal fittings 2.

[0073] In normal construction procedures, when a ceiling board 16 is attached to the ceiling substrate suspended from the floor slab 11 in this state and a weight W is added, the ceiling substrate will sink by δ. The resistance of the suspension bolt 13 at this time is r1, the resistance of the vibration-proof hanger 7 is r3, and the vertical component of the resistance of one brace 8 is r 2v / 2.

[0074] As shown in the enlarged view on the right side of Figure 12, after the ceiling panel 16 has been attached, the state of the sound-insulating metal fittings 2 is such that the outer member 22 is spaced apart from the inner member 21, and only the vibration-damping material 23 can be interposed between the inner member 21 and the outer member 22. In other words, acoustic insulation is achieved between the inner member 21 and the outer member 22, and it can be said that sound insulation can be ensured by interposing the sound-insulating metal fittings 2 between the brace 8 and the joist support portion 14.

[0075] Next, an experiment conducted to confirm the sound insulation properties of the suspended ceiling structure 1 of this embodiment will be described. The tests were carried out in a floor impact sound testing room (box-type reverberation chamber). The floor impact sound testing room is a two-story testing room separated by a 200mm thick cast-in-place concrete slab, with the test specimen placed on the lower floor (the space below the slab).

[0076] The vibration isolation performance of the ceiling is evaluated based on the damping performance of the vibration acceleration generated when the upper floor slab (corresponding to the floor slab 11) is vibrated with an impact hammer. Specifically, the vertical vibration acceleration of the underside of the floor slab 11 and the top surface of the ceiling board 16 is measured simultaneously, and the transfer function between the two is experimentally determined for evaluation.

[0077] The vibration isolation performance is expressed as the relative value of the transfer function between the two and the 1 / 3 octave vibration acceleration level. Figure 13 shows models of the four evaluation specimens used in the experiment. Figure 13(a) shows a suspended ceiling structure 1 of this embodiment, in which sound-insulating metal fittings 2 are attached to the lower ends of the braces 8 and vibration-isolating hangers 7 are also provided on the suspension bolts 13 (evaluation specimen a: this embodiment).

[0078] Figures 13(b), (c), and (d) are evaluation test specimens for comparison, with Figure 13(b) showing a suspended ceiling suspended only by suspension bolts 13 equipped with vibration-isolating hangers 7 (evaluation test specimen b: general vibration-isolating ceiling). Figure 13(c) shows a general earthquake-resistant suspended ceiling with normal suspension bolts 13 and braces 8 (evaluation test specimen c: general earthquake-resistant ceiling), and Figure 13(d) shows a suspended ceiling with suspension bolts 13 equipped with vibration-isolating hangers 7 and normal braces 8 (evaluation test specimen d: normal brace vibration-isolating ceiling).

[0079] Fig. 14 is an explanatory diagram comparing the experimental results of evaluation specimen a (this embodiment) and evaluation specimen d (normal braced vibration-isolated ceiling), while Fig. 15 is an explanatory diagram comparing the experimental results of evaluation specimen b (general vibration-isolated ceiling) and evaluation specimen c (general earthquake-resistant ceiling).

[0080] The experimental results of evaluation specimen a (this embodiment: Figure 14) and evaluation specimen b (general vibration-isolating ceiling: Figure 15) have in common the fact that they have a resonance peak at around 10 Hz. Furthermore, the experimental results of evaluation specimen a and evaluation specimen b have a positive acceleration level difference, and they share a band in which sound insulation is ensured. In other words, it can be said that evaluation specimen a has sound insulation performance on a par with that of a general vibration-isolating ceiling.

[0081] On the other hand, the experimental results for evaluation specimen c (general earthquake-resistant ceiling: Figure 15) showed that the acceleration level difference was negative, particularly in the high-frequency range (for example, the range above 31.5 Hz), and sound insulation was not achieved across almost the entire range. Furthermore, the experimental results for evaluation specimen d (normally braced vibration-proof ceiling: Figure 14) showed that sound insulation was impaired in part of the high-frequency range. It is presumed that in this frequency range, the normally placed braces 8 acted as sound bridges, impairing the effectiveness of the vibration-proof hangers 7. Furthermore, if connections were made using a method other than the sound-proof metal fittings 2 of this embodiment, the braces 8 would bear a significant portion of the weight of the ceiling panels 16, which would reduce the weight burden on the vibration-proof hangers and thereby reduce sound insulation performance.

[0082] Next, the operation of the sound-insulating metal fittings 2 and the suspended ceiling structure 1 of this embodiment will be described. The sound-insulating metal fittings 2 of this embodiment configured as described above are attached to the ends of braces 8 of a suspended ceiling structure 1 having joist support parts 14 and joist parts 15 that form the ceiling substrate. That is, the inner member 21 of the sound-insulating metal fitting 2 is attached to the joist support parts 14, and the other outer member 22 is attached to the lower end of the brace 8. Then, between the inner member 21 and the outer member 22, there are provided vibration-damping materials 23 that function as sound-insulating functional parts, and spacing, or simple spacing.

[0083] In this way, if the sound-insulating fittings 2 are interposed between the ends of the braces 8 and the sill support portions 14 (ceiling substructure), the system can be applied to various suspended ceilings, for example, where the braces 8 are placed on the ceiling substructure of a system ceiling using fittings other than the reinforcing fittings 3, making it highly versatile.

[0084] Furthermore, as described above, the sound insulation performance of the sound-insulating fittings 2 and suspended ceiling structure 1 of this embodiment has been confirmed through experiments, and it can be said that the sound insulation performance of various suspended ceiling structures can be easily improved.

[0085] In addition, such sound-insulating metal fittings 2 can be easily manufactured by covering the shaft portion 212 formed in the center of the flat plate portion 211 with the sheath tube portion 221 and interposing vibration-damping material 23 between the shaft portion 212 and the sheath tube portion 221.

[0086] Furthermore, since multiple mounting pieces 222 are provided on the sheath tube portion 221, by interposing a sound-insulating metal fitting 2 at a location where braces 8 are gathered from four directions, for example, a single fitting can be used to impart sound-insulating functionality to four braces 8.

[0087] In a suspended ceiling structure 1 suspended from a structural body such as a floor slab 11, sound insulation function can be easily ensured by attaching sound-insulating fittings 2 to the ends of the braces 8 connecting the floor slab 11 and the joist support portion 14.

[0088] In particular, when the ceiling substrate is suspended by a suspension bolt 13 equipped with an anti-vibration hanger 7, if the sound-insulating fitting 2 of this embodiment has a configuration in which the anti-vibration material 23 is interposed between the shaft portion 212 and the sheath tube portion 221, the brace 8 will not bear the weight of the ceiling panel 16. The anti-vibration hanger 7 of the suspension bolt 13 is designed to provide sufficient sound insulation performance even when the weight of the ceiling panel 16 is acting on it, so if a sound-insulating fitting 2 is used in which the brace 8 does not bear even a portion of the weight of the ceiling panel 16, the sound-insulating performance of the anti-vibration hanger 7 can be fully demonstrated.

[0089] Furthermore, by attaching sound-insulating fittings 2 to intersection 17A via reinforcing fittings 3, the brace 8 is connected to intersection 17A via reinforcing fittings 3, thereby increasing earthquake resistance, and since sound-insulating fittings 2 are interposed between the vibrations of the brace 8 and the ceiling panel 16, sound-insulating function can be ensured.

[0090] In other words, earthquake resistance and sound insulation can be efficiently improved simply by attaching reinforcing metal fittings 3 to the intersection 17A between the siding support 14 and the siding 15 and connecting the four braces 8 to the reinforcing metal fittings 3 via sound-insulating metal fittings 2. Furthermore, it has been confirmed through experiments that sufficient earthquake resistance and sound insulation can be ensured. [Example]

[0091] The following describes another embodiment of the sound-proof metal fitting 2 according to the above-described embodiment. The same terms or symbols are used to describe parts that are the same as or equivalent to those described in the above-described embodiment.

[0092] In the above embodiment, the case where the sound-insulating metal fittings 2 are attached to the lower ends of the braces 8 has been described, but the present invention is not limited to this. For example, it can also be used as in the suspended ceiling structure 1A shown schematically in Figure 16. That is, in the suspended ceiling structure 1A of this Example 1, the sound-insulating metal fittings 2 are interposed when the upper ends of the braces 8 are fixed to the tops of the suspension bolts 13 on the structural body side. With this arrangement, the suspension bolts 13 can also be used as the shafts 212 of the sound-insulating metal fittings 2.

[0093] In this way, sound insulation between the upper and lower floors can be ensured simply by placing sound-insulating metal fittings 2 on one end of the brace 8, which transmits vibrations and sound. Furthermore, the brace to which the sound-insulating metal fittings 2 can be attached at its end is not limited to those arranged in a V-shape, but may also be a brace that is a single diagonal member or a brace arranged in an X-shape. The other configurations and effects are substantially the same as those of the above embodiment, and therefore the description thereof will be omitted.

[0094] The embodiments and examples of the present invention have been described in detail above with reference to the drawings. However, the specific configurations are not limited to these embodiments or examples, and design changes that do not deviate from the gist of the present invention are included in the present invention.

[0095] For example, in the above embodiment, the case where the inner member 21 is the first member and the outer member 22 is the second member is described, but this is not limited to this, and the inner member 21 can also be the second member fixed to a brace 8 or the like, and the outer member 22 can be the first member fixed to a floor slab 11 or the like.

[0096] In addition, in the above embodiment, a mounting piece 222 for connecting the end of the brace 8 to the corner of the sheath pipe portion 221 is described, but this is not limited to this, and the side edge of the mounting piece can also be fixed to the side of the sheath pipe portion.

[0097] Furthermore, in the above embodiment, a configuration has been described in which the rectangular parallelepiped shaft portion 212 is surrounded by a square tubular sheath tube portion 221, but this is not limited to this, and the configuration may also be such that a cylindrical or polygonal prism-shaped shaft portion is surrounded by a cylindrical or polygonal tubular sheath tube portion.

[0098] Furthermore, in the above embodiment, a configuration was described in which vibration-damping material 23 is interposed between the outer peripheral surface of shaft portion 212 and the inner peripheral surface of sheath tube portion 221, but this is not limited to this, and there may simply be an air gap between the outer peripheral surface of the shaft portion and the inner peripheral surface of the sheath tube portion. [Explanation of symbols]

[0099] 1,1A: Suspended ceiling structure 11: Floor slab (structure) 13: Hanging bolt 14: Roof joist support (ceiling base) 15: Rough edge (ceiling base) 2: Sound-insulating metal fittings 21: Inner member (first member or second member) 211: Flat plate part 212: Shaft section 22: Outer member (second member or first member) 221: Sheath tube 222: Mounting piece 23: Vibration-proof material (sound-insulating function part) 8: Brace (diagonal member)

Claims

1. In a suspended ceiling structure having a ceiling substrate suspended from a structural body via a suspension bolt equipped with an anti-vibration hanger, a sound-insulating metal fitting is attached to the lower end of a diagonal member whose upper end is fixed to the upper part of the suspension bolt, A first member fixed to the ceiling substrate; a second member fixed to a lower end of the diagonal member; a sound-insulating function portion interposed between the first member and the second member, The first and second members are formed such that one is columnar and the other is cylindrical and surrounds the first, and a vibration-damping material that serves as the sound-insulating functional part is interposed between them, so that the weight of the ceiling panel attached to the ceiling substrate is borne by the hanging bolt equipped with the vibration-damping hanger, which has an overall axial rigidity higher than the axial rigidity of the vibration-damping material, causing the first member to sink below the second member.

2. One of the first member and the second member has a shaft portion formed in a columnar shape at the center of a flat plate portion, and the other has a sheath tube portion formed in a cylindrical shape surrounding the periphery of the shaft portion, 2. The sound-insulating metal fitting according to claim 1, wherein a vibration-isolating rubber is interposed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the sheath tube portion, and acoustic insulation is provided between the flat plate portion and the end face of the sheath tube portion.

3. 3. The sound-insulating metal fitting according to claim 2, wherein the sheath pipe portion is provided with mounting pieces for connecting the lower ends of the plurality of diagonal members.

4. A suspended ceiling structure having a ceiling substrate suspended from a structural body via suspension bolts equipped with vibration-isolating hangers, The sound-insulating metal fitting according to any one of claims 1 to 3, a diagonal member having a lower end fixed to the sound-insulating metal fitting, The structure and the ceiling underlayment are connected via the hanging bolt, the diagonal member whose upper end is fixed to the top of the hanging bolt, and the sound-insulating metal fittings, A suspended ceiling structure characterized in that the first member sinks more than the second member as the weight of the ceiling panel attached to the ceiling substructure is borne by the hanging bolt equipped with the vibration-damping hanger, whose overall axial rigidity is higher than the axial rigidity of the vibration-damping material.

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