Sound insulation structure

Abstract

To provide a sound insulation structure capable of enhancing sound insulation performance without compromising vibration isolation properties of suspended ceilings.SOLUTION: A sound insulation structure comprises: a first accommodating recess 50 which is formed in a long shape extending in a direction intersecting with a direction of extension of a joist (first horizontal member) 20 and accommodates a first end 21 of the plurality of joists 20; and a resiliently deformable cushioning material 70 provided between the first accommodating recess 50 and a first wall surface 5a. The first accommodating recess 50 has a first side plate portion 51 extending vertically while contacting the cushioning material 70, and a first extension portion 52 projecting from the first side plate portion 51 toward an opposite side of the first wall surface 5a. At least one first end 21 of the plurality of joists 20 is fixed to the first extension portion 52 at a distance from the first side plate portion 51.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a sound insulation structure. In construction

Background Art

[0002] Conventionally, in a double ceiling structure such as a general residence where a suspended ceiling having a soffit and a soffit receiving member for supporting the soffit is provided on a lower floor, in order to prevent vibrations and impact sounds generated on the floor of the upper floor from being transmitted to the lower floor, a method of hanging with a vibration isolator interposed therebetween, or a sound insulation structure is formed by interposing a vibration isolator between the soffit and the wall surface facing the soffit. Here, generally, a clearance (gap) for allowing horizontal movement of the soffit is intentionally provided between the soffit and the wall surface of the vibration isolation suspended ceiling.

[0003] On the other hand, in a double ceiling structure provided with a suspended ceiling having a soffit member disclosed in Patent Document 1 on a lower floor, a vibration isolator such as vibration isolation rubber is interposed between the end portion on the wall surface side of the soffit member and the wall surface, and the soffit holding member for receiving the end portion of the soffit is fixed to the surface of the wall portion with a fastener such as a nail or a screw.

[0004] Further, Patent Document 2 discloses a ceiling (vibration isolation suspended ceiling) capable of suppressing vibration transmission by a vibration isolator suspended from the floor of the upper floor. The vibration isolation suspended ceiling includes a suspension mechanism supported by the floor material of the upper floor via a floor beam, and a ceiling base supported by the suspension mechanism. Further, the ceiling base is connected to the floor material by a connection mechanism provided separately from the suspension mechanism. When a relative displacement occurs in the vertical direction between the ceiling base and the floor material of the upper floor while the ceiling base is suspended from the floor material of the upper floor by the suspension mechanism, the connection mechanism generates a reaction force in a direction that prevents its deformation in response to the relative displacement in the vertical direction between the floor constituent member and the ceiling base. The reaction force generated by the connection mechanism can attenuate the vibration of the ceiling base and enhance the sound insulation performance.

Prior Art Documents

Patent Documents

[0005] ​ [Patent Document 1] Japanese Patent Publication No. 2003-336345 [Patent Document 2] Japanese Patent Publication No. 2014-237972 [Overview of the project] [Problems that the invention aims to solve]

[0006] Incidentally, with vibration-isolating suspended ceilings, the ceiling substrate, which has joists and joist supports, undergoes relative vertical displacement with respect to the flooring of the upper floor at an arbitrary period, thereby suppressing the transmission of vibrations from the upper floor to the lower floor ceiling in the target frequency range. At the same time, the process of vibration transmission from the upper floor to the ceiling also includes transmission through the walls from the floor, and it is necessary to suppress this vibration transmission by causing the ceiling substrate to undergo relative horizontal displacement with respect to the floor structure. However, if the ceiling substrate is fixed (attached) at its ends to the surrounding walls or part of the floor structure, preventing it from moving vertically and horizontally, a disadvantage arises in that sufficient vibration isolation effect cannot be obtained and sound insulation performance is reduced.

[0007] Therefore, the present invention provides a sound insulation structure that can improve sound insulation performance without impairing the vibration damping properties of a suspended ceiling. construction The purpose is to provide it. [Means for solving the problem]

[0008] To address the above problems, the sound insulation structure of the present invention is a suspended ceiling structure having a plurality of first horizontal members extending horizontally and suspended from the structure of a building, and is a sound insulation structure provided between the wall surface of the structure and the plurality of first horizontal members facing each end of the plurality of first horizontal members, and comprises a first receiving recess formed in an elongated shape extending in a direction intersecting the extension direction of the first horizontal members and accommodating the ends of the plurality of first horizontal members, and an elastically deformable cushioning material provided between the first receiving recess and the wall surface, wherein the first receiving recess has a first side plate portion that is in contact with the cushioning material and extends in the vertical direction, and a first extension portion that protrudes from the first side plate portion to the side opposite to the wall surface, and at least one end of the plurality of first horizontal members is fixed to the first extension portion at a distance from the first side plate portion.

[0009] Here, it is desirable that the cushioning material is provided in an elastically deformed state between the first side plate portion and the wall surface of the first accommodating recess. Furthermore, it is desirable that the static friction coefficient between the first side plate portion and the cushioning material be 0.7 or less. Moreover, it is desirable that a friction-reducing member be provided between the first accommodating recess and the cushioning material.

[0010] Furthermore, the first horizontal member comprises a plurality of second horizontal members extending in the intersecting direction, an elongated second receiving recess that accommodates the ends of the plurality of second horizontal members and extends in the extending direction, and an elastically deformable cushioning material provided between the second receiving recess and the wall surface, wherein the second receiving recess has a second side plate portion that is in contact with the cushioning material and extends in the vertical direction, and a second extending portion that protrudes from the second side plate portion to the side opposite to the wall surface, and it is desirable that at least one end of the plurality of second horizontal members is fixed to the second extending portion at a distance from the second side plate portion. Moreover, it is desirable that a ceiling material extending in the extending direction and the intersecting direction is provided below the first horizontal member, and that a sound insulation material is placed between the ceiling material and the wall surface.

[0011] The present invention relates to a method for constructing a sound-insulating structure in a suspended ceiling structure having a plurality of first horizontal members extending horizontally and suspended from the structure of a building, wherein the sound-insulating structure is provided between the wall surface of the structure and each end of the plurality of first horizontal members, and the plurality of first horizontal members, comprising: an attachment step of attaching an elastically deformable buffer material to the wall surface along an intersecting direction that intersects the extension direction of the first horizontal members; a temporary fixing step of temporarily fixing a first receiving recess, which is formed in an elongated shape extending in the intersecting direction, in contact with the buffer material and extending vertically, and has a first side plate portion that protrudes from the first side plate portion to the side opposite to the wall surface, and which accommodates the ends of the plurality of first horizontal members, to the wall surface with a first fixing member while the buffer material is compressed to a predetermined thickness; and a final fixing step of fixing at least one end of the plurality of first horizontal members to the first extending portion at a distance from the first side plate portion, and then removing the first fixing member.

[0012] In the temporary fixing step, it is desirable to place a spacer having thickness in the extending direction between the wall surface and the first receiving recess, and to compress the cushioning material by pressing it against the first receiving recess in the extending direction until the thickness of the cushioning material matches the thickness of the spacer. Furthermore, in the main fixing step, it is desirable that the position of the first fixing member, which is arranged along the intersecting direction, does not overlap with the position where the first horizontal member is housed. [Effects of the Invention]

[0013] As described above, the sound insulation structure of the present invention is formed in an elongated shape extending in a direction intersecting the extension direction of the first horizontal member, and comprises a first receiving recess that accommodates the ends of a plurality of first horizontal members, and an elastically deformable cushioning material provided between the first receiving recess and the wall surface, the first receiving recess having a first side plate portion that is in contact with the cushioning material and extends in the vertical direction, and a first extending portion that protrudes from the first side plate portion toward the side opposite to the wall surface, and at least one end of the plurality of first horizontal members is fixed to the first extending portion at a distance from the first side plate portion.

[0014] As a result, the first receiving recess is connected to the wall surface of the structure via the buffer material, without being fixed to the wall. In short, the first receiving recess remains movable, while the buffer material prevents any gaps from forming between it and the wall surface of the structure. Therefore, sound leakage can be prevented without compromising the vibration isolation of the suspended ceiling. Furthermore, it is possible to prevent vibrations from being transmitted from the wall surface to the ceiling.

[0015] In particular, if the cushioning material is provided in an elastically deformed state between the first side plate portion of the first housing recess and the wall surface, the airtightness between the first housing recess and the cushioning material can be improved. Therefore, the sound leakage prevention effect can be further improved.

[0016] Furthermore, if the static friction coefficient between the first side plate and the cushioning material is 0.7 or less, friction is less likely to occur between the first side plate and the cushioning material, making it easier for the first receiving recess to move vertically and further improving vibration damping.

[0017] Furthermore, if a friction-reducing member is provided between the first accommodating recess and the cushioning material, friction between the first side plate and the cushioning material can be prevented. Consequently, the first accommodating recess becomes easier to move in the vertical direction, further improving vibration damping.

[0018] Furthermore, the sound insulation structure comprises a plurality of second horizontal members extending in intersecting directions, a long second accommodating recess, and an elastically deformable cushioning material provided between the second accommodating recess and the wall surface. The second accommodating recess has a second side plate portion that contacts the cushioning material and extends in the vertical direction, and a second extension portion that protrudes from the second side plate portion toward the side opposite the wall surface. If at least one end of the plurality of second horizontal members is fixed to the second extension portion at a distance from the second side plate portion, the second horizontal members extending in intersecting directions can be attached to the wall surface of the structure without gaps while maintaining a movable state, thereby preventing sound leakage without impairing vibration damping.

[0019] In addition, when a ceiling material that extends in the extending direction and the intersecting direction is provided below the first horizontal member, and a sound insulation material is arranged between the ceiling material and the wall surface, it is possible to suppress vibration transmission from the upper floor while blocking the radiated sound and transmitted sound from the upper floor, and to further improve the sound insulation performance of the sound insulation structure.

[0020] In addition, the construction method of the sound insulation structure includes an attachment step of attaching a buffer material that is elastically deformable to the wall surface along the intersecting direction that intersects the extending direction of the first horizontal member, and a first side plate portion that is formed in a long shape extending in the intersecting direction, contacts the buffer material, and extends in the vertical direction, and a first extension portion that protrudes from the first side plate portion to the side opposite to the wall surface, and a first accommodation recess that accommodates the ends of a plurality of first horizontal members. A temporary fixing step of temporarily fixing the wall surface to the wall surface by a first fixing member in a state where the buffer material is compressed to a predetermined thickness, and a main fixing step of fixing at least one end of a plurality of first horizontal members to the first extension portion at an interval from the first side plate portion and then removing the first fixing member.

[0021] That is, after the first accommodation recess is temporarily fixed to the wall surface via the buffer material by the first fixing member, when the first fixing member is removed, the first accommodation recess is attached to the wall surface of the structure without gaps while maintaining a movable state. Therefore, sound leakage can be prevented without impairing the anti-vibration performance.

[0022] In addition, in the temporary fixing step, when a spacer having a thickness in the extending direction is arranged between the wall surface and the first accommodation recess, and the first accommodation recess is pressed until the thickness of the buffer material coincides with the thickness of the spacer in the extending direction to compress the buffer material, the first accommodation recess compresses the buffer material until it coincides with the thickness of the spacer, and an arbitrary repulsive force is applied to the first accommodation recess from the buffer material. Therefore, an arbitrary repulsive force from the buffer material can be easily, stably, and surely obtained. [[ID=~13]]

[0023] Furthermore, in this fixing process, if the first fixing member is positioned in a location that does not overlap with the position where the first horizontal member is housed along the intersecting direction, the position where the first fixing member is positioned and the position where the first fixing member is attached and detached will be different. Therefore, even after the first horizontal member has been housed, the first fixing member can be easily removed. [Brief explanation of the drawing]

[0024] [Figure 1] This is a plan view of a suspended ceiling structure to which a sound insulation structure according to an embodiment of the present invention is applied. [Figure 2] This is a cross-sectional view taken in the direction of arrow AA in Figure 1. [Figure 3] This is a cross-sectional view taken in the direction of arrow BB in Figure 1. [Figure 4] This is a magnified perspective view showing the ceiling joist portion housed in the first recessed area. [Figure 5] This is an explanatory diagram showing each step of the construction method for the sound insulation structure according to the embodiment. [Figure 6] This is an explanatory diagram showing each step of the construction method for the sound insulation structure according to the embodiment. [Figure 7] This is a diagram illustrating the end treatment of the first receiving recess. [Figure 8] This figure illustrates another example of end treatment for the first receiving recess. [Figure 9] This is a model of a sound insulation structure according to the embodiment. [Figure 10] This graph shows the relationship between vibration ratio and vibration transmittance. [Figure 11] This is an explanatory diagram comparing the experimental results of two evaluation test specimens. [Modes for carrying out the invention]

[0025] Hereinafter, a sound insulation structure and a construction method for the sound insulation structure according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a plan view of a suspended ceiling structure 1 to which the sound insulation structure according to an embodiment of the present invention is applied, and Figures 2 and 3 are cross-sectional views of the suspended ceiling structure 1.

[0026] The suspended ceiling structure 1 is, for example, installed in the ceiling of a typical wooden house. The ceiling structure of this embodiment can be applied to both existing suspended ceilings and newly installed suspended ceilings.

[0027] As shown in Figures 2 and 3, multiple vibration-damping suspension bolts 3 are suspended at intervals from the underside of the upper floor slab 2, which forms the structural element of the building, and a furring strip support (second horizontal member) 30 is suspended from the lower end of each vibration-damping suspension bolt 3. Multiple furring strips (first horizontal members) 20 are attached to the lower side of each furring strip support 30 so as to extend in a direction intersecting the furring strip support 30. In the following description, the extension direction of the furring strip 20 is referred to as the X direction, the extension direction of the furring strip support 30 as the Y direction, and the vertical direction as the Z direction.

[0028] The vibration-damping suspension bolt 3 comprises an upper bolt 31 located on the floor side, a lower bolt 32 located on the ceiling side, and a pair of vibration-damping materials 33 located between the upper bolt 31 and the lower bolt 32. The upper bolt 31 is a member that connects the vibration-damping material 33 to the floor slab 2, and the lower bolt 32 is a member that connects the vibration-damping material 33 to the ceiling joist support portion 30. The vibration-damping material 33 is made of, for example, elastic rubber, polyurethane, silicone, spring, etc., but is not limited to these.

[0029] Thus, a furring strip 20 or furring strip support 30 is provided on the lower side of the floor slab 2 via a vibration-damping material 33. Note that the vibration-damping material 33 may not be provided on either the upper bolt 31 side or the lower bolt 32 side.

[0030] As shown in Figure 1, the furring strip 20 and the furring strip support 30 are intersecting and are provided on the lower side of the floor slab 2, as shown in Figures 2 and 3. The furring strip 20 is provided between a pair of opposing first wall surfaces 5a, and both ends are housed in the first housing recess 50. The furring strip support 30 is provided between a pair of opposing second wall surfaces 5b, and both ends are housed in the second housing recess 60.

[0031] Cushioning material 70 is attached to the first wall surface 5a and the second wall surface 5b. The furring strip 20 is attached to the first wall surface 5a via the first receiving recess 50 and the cushioning material 70. The furring strip support 30 is attached to the second wall surface 5b via the second receiving recess 60 and the cushioning material 70.

[0032] As shown in Figure 2, the second accommodating recess 60 is configured to have a second side plate portion 61 that is in contact with the cushioning material 70 and extends in the vertical direction, and a second extension portion 62 that protrudes from the second side plate portion 61 to the side opposite to the second wall surface 5b. Also, as shown in Figure 3, the first accommodating recess 50 is configured to have a first side plate portion 51 that is in contact with the cushioning material 70 and extends in the vertical direction, and a first extension portion 52 that protrudes from the first side plate portion 51 to the side opposite to the first wall surface 5a.

[0033] As shown in Figure 3, ceiling material 4, such as gypsum board, is attached to the lower surface of the ceiling joist 20. This ceiling material 4 forms the ceiling surface. Sound insulation material 4a is provided between the ceiling material 4 and the first wall surface 5a and the second wall surface 5b.

[0034] Figure 4 is an enlarged perspective view showing the state in which the ceiling joist portion 20 is housed in the first housing recess 50. In the following description, the case in which the ceiling joist portion 20 is housed in the first housing recess 50 will be explained, but the same applies to the case in which the ceiling joist support portion 30 is housed in the second housing recess 60.

[0035] As shown in Figure 4, an elastically deformable cushioning material 70 is attached to the first wall surface 5a. The cushioning material 70 is an elastic backer material or sealing material composed of, for example, vibration-damping rubber, vibration-damping sheet, porous sound-absorbing material, etc. The cushioning material 70 has thickness in the direction protruding from the first wall surface 5a (X direction) and extends uniformly in the horizontal direction (Y direction) along the first wall surface 5a. The cushioning material 70 may be composed of multiple members arranged at intervals in the horizontal direction.

[0036] The first receiving recess 50 is a member formed in an elongated shape that extends horizontally. The first receiving recess 50 extends along the cushioning material 70 and is attached to the cushioning material 70. The first receiving recess 50 accommodates the first end portion 21 of the furring strip 20.

[0037] The first extension portion 52 is composed of a pair of protruding pieces 52a and 52b that project from the first side plate portion 51 toward the furring strip portion 20, and the first receiving recess 50 is formed in a U-shape in side view by the first side plate portion 51 and the pair of protruding pieces 52a and 52b.

[0038] The first accommodating recess 50 is fixed to the wall portion 5 by a plurality of first fixing members 72. Each of the plurality of first fixing members 72 is positioned along the extending direction (Y direction) of the first accommodating recess 50 in a location that does not overlap with the furring strip portion 20 of the first side plate portion 51.

[0039] The first extension portion 52 may have only one of the protruding pieces 52a and 52b, and the first receiving recess 50 may be configured in an L-shape in side view by the first side plate portion 51 and one of the pair of protruding pieces 52a and 52b.

[0040] Next, with reference to Figures 5 and 6, each step of the construction method for the sound-insulating structure will be explained. In the following, the step in which the joist portion 20 is housed in the first housing recess 50 will be explained, but the step in which the joist support portion 30 is housed in the second housing recess 60 will be carried out using the same procedure. Also, the explanation will focus on one end of the joist portion 20, but the same procedure will apply to the other end.

[0041] First, in step 1 of Figure 5, an elastically deformable cushioning material 70 is attached to the first wall surface 5a along the intersecting direction (Y direction) that intersects with the extension direction (X direction) of the first horizontal member, the furring strip 20 (attachment step). That is, in step 1, the cushioning material 70 is attached to the first wall surface 5a at the same height as the first accommodating recess 50 that is to be attached, using an adhesive or the like.

[0042] Next, in steps 2 and 3, with the cushioning material 70 compressed to a predetermined thickness, the first receiving recess 50 is temporarily fixed to the first wall surface 5a by the first fixing member 72 (temporary fixing step). In addition, a spacer 71 having a thickness in the extending direction (X direction) of the furring strip 20 is placed between the first wall surface 5a and the first receiving recess 50, and the cushioning material 70 is compressed by pressing the first receiving recess 50 until the thickness of the cushioning material 70 matches the thickness of the spacer 71 in the extending direction of the furring strip 20.

[0043] The spacer 71, positioned between the first side plate portion 51 and the first wall surface 5a, is a member thinner than the cushioning material 70, and can be any flat plate-shaped member having a predetermined thickness, such as a steel plate, wooden board, or plastic plate.

[0044] As the first fixing member 72 moves toward the first wall surface 5a, the first side plate portion 51 moves toward the first wall surface 5a and presses against the cushioning material 70. The pressure on the cushioning material 70 by the first side plate portion 51 continues until the thickness of the cushioning material 70 matches the thickness of the spacer 71. The first fixing member 72 should be installed in a position that does not overlap with the position where the furring strip 20 is positioned in the extending direction of the first housing recess 50. That is, the position of the first fixing member 72, which is positioned along the extending direction of the first housing recess 50, should not overlap with the position where the furring strip 20 is housed.

[0045] Note that the temporary fixing steps in steps 2 and 3 may be performed with the joist portion 20 already fitted into the first receiving recess 50. However, the fixing of the joist portion 20 and the first side plate portion 51 by the second fixing member 73 shall be performed after the temporary fixing steps are completed.

[0046] In the next step 4, the furring strip 20 is accommodated in a position that does not overlap with the position where the first fixing member 72 is located in the extending direction of the first accommodating recess 50. That is, as shown in step 4 of Figure 6, the furring strip 20 is accommodated in the first accommodating recess 50, which is fixed to the first wall surface 5a.

[0047] In this configuration, when the joist portion 20 is housed in the first receiving recess 50, the first end portion 21 of the joist portion 20 is positioned at a distance from the first side plate portion 51. The joist portion 20 is also fixed to the lower protruding piece 52b that extends from the first side plate portion 51 by the second fixing member 73.

[0048] Thus, the first end portion 21 is positioned at a distance from the first side plate portion 51 because the dimension of the furring strip portion 20 in the extending direction is smaller than the dimension between the first wall surfaces 5a. This dimensional difference makes it easier to accommodate the furring strip portion 20 in the first receiving recess 50.

[0049] In the following step 5, at least one first end portion 21 of the multiple furring strips 20 is fixed to the first extension portion 52 at a distance from the first side plate portion 51, and then the spacer 71 and the first fixing member 72 are removed (this fixing step). In short, it is sufficient that at least one of the multiple furring strips 20 is fixed to the first receiving recess 50.

[0050] Furthermore, the spacer 71 and the first fixing member 72, which become unnecessary after the first receiving recess 50 is fixed to the ceiling joist 20, are removed. Note that the first fixing member 72 is positioned in a location that does not overlap with the ceiling joist 20 in the direction in which the first receiving recess 50 extends, so the first fixing member 72 can be easily removed.

[0051] In the final step 6, the ceiling material 4 extending in the direction of extension of the ceiling joist 20 (X direction) and in the direction of intersection with the extension direction (Y direction) is fixed to the lower side of the ceiling joist 20 by the third fixing member 74. A sound-insulating material 4a is provided between the ceiling material 4 and the first wall surface 5a.

[0052] The sound insulation material 4a is preferably an elastic filler such as an elastic sealant, but any elastic material that can seal the gap between the ceiling material 4 and the first wall surface 5a may be used.

[0053] Through the above procedure, multiple elongated joists 20 are attached to the first wall surface 5a via the first receiving recess 50. This allows the force acting from the joists 20 to the cushioning material 70 to be transmitted uniformly and stably, compared to the case where only the multiple joists 20 individually press against the cushioning material 70. In short, since the load can be applied more broadly from the joists 20 to the first wall surface 5a, variations due to construction accuracy can be reduced.

[0054] Figure 7 is a diagram illustrating the end treatment of the first receiving recess 50. When the furring strip 20 is housed in the first receiving recess 50, the first side plate portion 51 of the first receiving recess 50, which is formed in a U-shape in side view, makes surface contact with the first wall surface 5a via the cushioning material 70.

[0055] When the first recessed portion 50 is in contact with the cushioning material 70, it is desirable that the first recessed portion 50 be smooth relative to the cushioning material 70 in order to properly handle vertical impacts from the floor structure above. In other words, it is desirable that no frictional force exceeding a certain level acts between the first recessed portion 50 and the cushioning material 70.

[0056] Here, if F is the impact force applied to the ceiling by an impact from the floor structure above, F' is the force required to deflect the cushioning material 70 by a predetermined amount, and μ is the coefficient of static friction between the first receiving recess 50 and the cushioning material 70, then the conditions under which the ceiling substrate experiences relative vertical displacement with respect to the floor structure are: F < μF' The following relationship holds true.

[0057] Here, assuming that the conditions for effective vibration isolation of the ceiling are that the impact force input to the floor structure is greater than or equal to that of human walking, and the natural frequency of the cushioning material 70 is about 10 Hz or less, it is desirable that the static friction coefficient μ be 0.7 or less. This can be achieved by making the first side plate portion 51 a smooth metal surface such as iron, forming the cushioning material 70 from vibration-damping rubber, vibration-damping sheet, and porous sound-absorbing material (such as glass wool or rock felt), or by covering the surface of the cushioning material 70 with nonwoven fabric or the like. It is desirable that the static friction coefficient μ be as small as possible, and may be 0.1 or less.

[0058] Furthermore, in order to ensure smoothness between the first recessed area 50 and the cushioning material 70, it is desirable to provide a friction-reducing member 75 between the first recessed area 50 and the cushioning material 70, as shown in Figure 8. As the friction-reducing member 75, for example, a tetrafluoroethylene resin material such as Teflon (registered trademark) with a low coefficient of friction may be used. The friction-reducing member 75 can be fixed to either the first recessed area 50 side or the cushioning material 70 side with an adhesive or the like.

[0059] Figure 9 is a schematic diagram showing a theoretical model of a conventional sound insulation structure, and Figure 10 is a graph showing the relationship between the vibration ratio and the vibration transmission coefficient. As shown in Figure 9, in the conventional theoretical model, the mass of the ceiling material 4 is m, the spring constant of the vibration-damping suspension bolt 3 is K, and the viscous resistance is C1, and in addition to these, a resistance C2 newly provided in the end treatment is added. In this invention, the resistance C2 to be controlled is the frictional force μF'. The ratio of the impact force F1 input to the ceiling material 4 and the force F2 transmitted to the floor structure, that is, the vertical vibration transmission coefficient between the floor structure and the ceiling, can be expressed by the following equation (1).

number

[0060] Furthermore, the damping ratio ζ and the vibration ratio η can be expressed by the following equations (2)-(3).

number

number

number

[0061] Furthermore, the horizontal vibration transmission coefficient between the wall and the ceiling can be expressed by the following equation (5).

number

[0062] Furthermore, the natural frequency of the cushioning material 70 can be expressed by the following equation (6).

number

[0063] Here, as shown in Figure 10, as the damping ratio ζ increases, the amplification at the resonant frequency decreases and the vibration isolation effect also decreases. For this reason, in order to reduce variations due to construction accuracy when attaching the furring strip 20 to the first wall surface 5a and to reliably obtain a vibration isolation effect, the vibration ratio η was increased so that the vibration transmission coefficient was below a certain level. That is, it was necessary to secure an arbitrary amount of deflection for the cushioning material 70 so that the natural frequency of the cushioning material 70 is below a certain level, and in addition, it was necessary to satisfy the condition of the static friction coefficient μ required to keep the frictional force between the first receiving recess 50 and the cushioning material 70, which occurs when securing the amount of deflection of the cushioning material 70, below a certain level.

[0064] Figure 11 is an explanatory diagram comparing the experimental results of two evaluation test specimens. Here, an experiment was conducted comparing the sound insulation structure according to this embodiment with a conventional ceiling structure fixed to a wall surface.

[0065] In the experiment, vibration-damping hanger material with vibration-damping rubber having a dynamic spring constant of 150 N / mm was used as the vibration-damping suspension bolt 3, a material consisting of two layers of 12.5 mm thick gypsum board was used as the ceiling material 4, a silicone product was used as the sound insulation material 4a, and a rock wool-based felt material with a static friction coefficient of approximately 0.3 was used as the cushioning material 70. In addition, the ceiling joist section 20, the first receiving recess 50, the ceiling joist support section 30, and the second receiving recess 60 were each made from long pieces of sheet metal formed by bending.

[0066] Here, in both the case of the heavy impact source shown in Figure 11(a) and the case of the lightweight impact source shown in Figure 11(b), it can be seen that the reduction in vibration acceleration level is greater in the sound insulation structure according to this embodiment compared to the conventional ceiling structure. The conventional ceiling structure used in the experiment had the same component configuration as the components described above, with the ceiling base (furring strips 20) fixed to the wall surface. In summary, in this embodiment, by attaching the elongated furring strips 20, formed via the first receiving recess 50, to the first wall surface 5a using the above construction procedure, variations due to construction accuracy were reduced, and the vibration isolation effect was improved by increasing the amount of deflection of the cushioning material 70 and reducing the natural frequency f0.

[0067] As described above, the sound insulation structure according to this embodiment is formed in an elongated shape extending in a direction intersecting the extension direction of the furring strip (first horizontal member) 20, and comprises a first receiving recess 50 that accommodates the first ends 21 of a plurality of furring strips 20, and an elastically deformable cushioning material 70 provided between the first receiving recess 50 and the first wall surface 5a. The first receiving recess 50 has a first side plate portion 51 that is in contact with the cushioning material 70 and extends in the vertical direction, and a first extension portion 52 that protrudes from the first side plate portion 51 to the side opposite to the first wall surface 5a, and at least one first end 21 of the plurality of furring strips 20 is fixed to the first extension portion 52 at a distance from 51.

[0068] As a result, the first receiving recess 50 is attached to the first wall surface 5a of the wall portion 5 constituting the floor slab (structure) 2 via the cushioning material 70, without being fixed in place. In short, the first receiving recess 50 is attached to the first wall surface 5a while maintaining a state in which it can move vertically relative to the first wall surface 5a, and is pressed against the first wall surface 5a without any gaps. Therefore, sound leakage can be prevented without impairing the vibration isolation of the suspended ceiling. Furthermore, it is possible to prevent vibrations from being transmitted from the wall surface to the ceiling side.

[0069] In particular, if the cushioning material 70 is provided between the first side plate portion 51 of the first housing recess 50 and the first wall surface 5a in a state of stable elastic deformation to an arbitrary thickness (amount of deformation), vibrations transmitted from the wall surface to the ceiling can be effectively damped. Furthermore, the airtightness between the first housing recess 50 and the cushioning material 70 can be improved. Consequently, the effect of preventing sound leakage can be further enhanced.

[0070] Furthermore, if the static friction coefficient between the first side plate portion 51 and the cushioning material 70 is 0.7 or less, friction is less likely to occur between the first side plate portion 51 and the cushioning material 70. Therefore, the first receiving recess 50 can move more easily in the vertical direction, further improving vibration damping.

[0071] Furthermore, if a friction-reducing member 75 is provided between the first accommodating recess 50 and the cushioning material 70, friction between the first side plate portion 51 and the cushioning material 70 can be prevented. Consequently, the first accommodating recess 50 becomes easier to move in the vertical direction, further improving vibration damping.

[0072] Furthermore, the sound insulation structure comprises a plurality of furring strip support parts (second horizontal members) 30 extending in a direction intersecting the extension direction of the furring strip 20, a long second receiving recess 60, and an elastically deformable cushioning material provided between the second receiving recess 60 and the second wall surface 5b. The second receiving recess 60 has a second side plate portion 61 that is in contact with the cushioning material and extends in the vertical direction, and a second extension portion 62 that protrudes from the second side plate portion 61 to the side opposite the second wall surface 5b. If at least one end of the plurality of furring strip support parts 30 is fixed to the second extension portion 62 at a distance from the second side plate portion, the furring strip support parts 30 extending in a direction intersecting the extension direction of the furring strip 20 can be attached to the second wall surface 5b of the wall portion 5 without gaps while maintaining a movable state. Therefore, sound leakage can be prevented without impairing vibration damping.

[0073] Furthermore, if a ceiling material 4 is provided below the ceiling joist 20, and a sound insulation material 4a is placed between the ceiling material 4 and the first wall surface 5a and the second wall surface 5b, then radiated and transmitted sound from the upper floor can be blocked from reaching the lower floor room. Therefore, the sound insulation performance of the sound insulation structure can be further improved.

[0074] Furthermore, the construction method for the sound-insulating structure includes an attachment step of attaching a cushioning material 70 that is elastically deformable along an intersecting direction that intersects with the extension direction of the furring strip 20 to the first wall surface 5a; a temporary fixing step of compressing the cushioning material 70 to a predetermined thickness using a first fixing member 72 and temporarily fixing the first receiving recess 50, which is formed in a long shape extending in the intersecting direction and has a first side plate portion that contacts the cushioning material 70 and extends in the vertical direction, and a first extension portion that protrudes from the first side plate portion to the side opposite to the first wall surface 5a and accommodates the ends of a plurality of furring strips 20, to the first wall surface 5a via the cushioning material 70; and a final fixing step of fixing at least one end of a plurality of furring strips 20 to the first extension portion at a distance from the first side plate portion, and then removing the spacer 71 and the first fixing member 72.

[0075] Specifically, after the first receiving recess 50 is temporarily fixed to the first wall surface 5a via the cushioning material 70 by the first fixing member 72, the spacer 71 and the first fixing member 72 are removed, thereby attaching the first receiving recess 50 to the first wall surface 5a of the wall 5 without any gaps while maintaining a movable state. Therefore, sound leakage can be prevented without impairing vibration damping.

[0076] Furthermore, in the temporary fixing process, a spacer having thickness in the extending direction is placed between the first wall surface 5a and the first receiving recess 50, and the first receiving recess 50 is compressed relative to the cushioning material 70 until the thickness of the cushioning material 70 matches the thickness of the spacer in the extending direction. As a result, the first receiving recess 50 compresses the cushioning material 70 until it matches the thickness of the spacer, thereby applying a repulsive force from the cushioning material 70 to the first receiving recess 50. Therefore, it is possible to reliably obtain a repulsive force from the cushioning material 70. This makes it possible to accurately dampen vibrations transmitted from the wall surface to the ceiling side.

[0077] Furthermore, in this fixing process, if the position of the first fixing member 72, which is arranged along the intersecting direction, does not overlap with the position where the ceiling joist portion 20 is housed, then the position where the first fixing member 72 is placed and the position where the first fixing member 72 is attached and detached are different. Therefore, even after the ceiling joist portion 20 has been housed, the first fixing member 72 can be easily removed.

[0078] Although various embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design modifications that do not depart from the spirit of the present invention are included in the present invention. [Explanation of Symbols]

[0079] 1: Suspended ceiling structure 2: Floor slab (structural element) 3: Vibration-damping suspension bolts 31: Upper bolt 32: Lower bolt 33: Vibration isolating material 4: Ceiling materials 4a: Sound insulation material 5: Wall 5a: 1st wall 5b: Second wall 20: Ceiling joist section (first horizontal member) 21 :First end 30: Joist support section (second horizontal member) 50: First accommodating recess 51:First side plate part 52: 1st extension part 60: Second housing recess 61:Second side plate part 62:Second extension part 70: Cushioning material 71: Spacer 72: First fixing member 73: Second fixing member 75: Friction-reducing member

Claims

1. In a suspended ceiling structure having a plurality of first horizontal members extending horizontally and suspended from the building structure, a sound insulation structure is provided between the wall surface of the structure facing each end of the plurality of first horizontal members and the plurality of first horizontal members, A first receiving recess is formed in an elongated shape extending in an intersecting direction that intersects the extending direction of the first horizontal member, and accommodates the ends of the plurality of first horizontal members, The device comprises an elastically deformable cushioning material provided between the first accommodating recess and the first wall surface to which the first accommodating recess is fixed, The first receiving recess has a first side plate portion that is in contact with the cushioning material and extends in the vertical direction, and a first extension portion that protrudes from the first side plate portion toward the side opposite to the first wall surface. At least one end of the plurality of first horizontal members is fixed to the first extension portion at a distance from the first side plate portion. A sound-insulating structure characterized in that the static friction coefficient between the first side plate and the cushioning material is 0.7 or less.

2. The sound insulation structure according to claim 1, characterized in that the cushioning material is provided in an elastically deformed state between the first side plate portion and the first wall surface of the first accommodating recess.

3. A plurality of second horizontal members extending in the aforementioned intersecting direction, The ends of the plurality of second horizontal members are accommodated in the elongated second accommodating recess that extends in the extension direction, The device comprises an elastically deformable cushioning material provided between the second accommodating recess and the second wall surface to which the second accommodating recess is fixed, The second receiving recess has a second side plate portion that is in contact with the cushioning material and extends in the vertical direction, and a second extension portion that protrudes from the second side plate portion toward the side opposite to the second wall surface. The sound insulation structure according to claim 1 or 2, characterized in that at least one end of the plurality of second horizontal members is fixed to the second extension portion at a distance from the second side plate portion.

4. Below the first horizontal member, ceiling material is provided that extends in the extension direction and the intersecting direction. The sound insulation structure according to claim 3, characterized in that a sound insulation material is placed between the ceiling material and the first wall surface or the second wall surface.

Images