Construction method of sound insulation structure

Abstract

To provide a construction method of sound insulation structure capable of enhancing sound insulation performance without damaging vibration resistance of a hanging ceiling.SOLUTION: A construction method of sound insulation structure includes: a mounting step of mounting a buffer material 70 elastically deformable along a crossing direction crossing the extension direction of a ceiling joist part 20 with respect to a first wall surface 5a; a temporary fixing step of temporarily fixing a first side plate part formed in a long shape extending in the crossing direction, coming into contact with the buffer material 70, and extending in the vertical direction, and a first storage recess part 50 having a first extension part protruding to the opposite side from the first wall surface 5a from the first side plate part, and for storing end parts of the plurality of ceiling joist parts 20 to the first wall surface 5a via the buffer material 70 by compressing the buffer material 70 to predetermined thickness by a first fixing member 72; and a permanent fixing step of fixing at least one end part of the plurality of ceiling joist parts 20 to the first extension part having an interval with the first side plate part, and of removing a spacer 71 and the first fixing member 72.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a sound-insulating structure. [Background technology]

[0002] In the past, in double ceiling structures such as those found in ordinary houses, where a suspended ceiling with a rafter and rafter support material supporting the rafter is installed on the lower floor, methods have been used to prevent vibrations and impact sounds generated on the floor above from being transmitted to the lower floor, such as by suspending the ceiling with an intervening vibration-isolating material, or by placing an intervening vibration-isolating material between the rafter and the wall surface facing the rafter to create a soundproof structure. Generally, a clearance (gap) is intentionally provided between the rafter of the vibration-isolating suspended ceiling and the wall surface to allow the rafter to move horizontally.

[0003] On the other hand, in the double ceiling structure disclosed in Patent Document 1, in which a suspended ceiling with furring strips is provided on the lower floor, vibration-damping materials such as vibration-damping rubber are interposed between the wall-side ends of the furring strips and the wall surface, and the furring strip retaining materials that support the ends of the furring strips are fixed to the surface of the wall with fasteners such as nails or screws.

[0004] Furthermore, Patent Document 2 discloses a ceiling (vibration-isolating suspended ceiling) that can suppress vibration transmission using vibration-isolating materials suspended from the floor of the upper floor. The vibration-isolating suspended ceiling is configured with a suspension mechanism supported by floor beams on the floor material of the upper floor, and a ceiling substructure supported by the suspension mechanism. The ceiling substructure is connected to the floor material by a connecting mechanism provided separately from the suspension mechanism. When the ceiling substructure is suspended from the floor material of the upper floor by the suspension mechanism and displaces vertically relative to the floor material of the upper floor, the connecting mechanism generates a reaction force in a direction that prevents the deformation in accordance with the vertical relative displacement between the floor-constituting members and the ceiling substructure. The reaction force generated by the connecting mechanism attenuates vibrations in the ceiling substructure, thereby improving sound insulation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-336345 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-237972 Summary of the Invention [Problem to be solved by the invention]

[0006] In a vibration-isolating suspended ceiling, the ceiling substructure, which includes the rafters and rafter supports, undergoes vertical displacement relative to the floor material of the upper floor at a given frequency, thereby suppressing the transmission of vibrations from the upper floor to the ceiling of the lower floor in the target frequency range. At the same time, the process of vibration transmission from the upper floor to the ceiling also includes vibrations transmitted from the floor to the wall. To prevent this, it is necessary to suppress the transmission of vibrations by, for example, causing the ceiling substructure to undergo horizontal displacement relative to the floor structure. However, if the ceiling substructure is fixed (secured) at its edges to the surrounding walls or parts of the floor structure, preventing it from moving vertically and horizontally, the vibration-isolating effect is insufficient, resulting in a decrease in sound insulation performance.

[0007] Therefore, an object of the present invention is to provide a construction method for a sound-insulating structure that can improve the sound-insulating performance without impairing the vibration-proofing properties of a suspended ceiling. [Means for solving the problem]

[0008] In response to the above-mentioned problems, the construction method of the soundproof structure of the present invention is a construction method of a soundproof structure in a suspended ceiling structure having a plurality of first horizontal members extending horizontally and suspended from the structural body of a building, the construction method being a method of constructing a soundproof structure that is provided between the wall surface of the structural body that faces each end of the plurality of first horizontal members and the plurality of first horizontal members, the construction method comprising the steps of: attaching an elastically deformable cushioning material to the wall surface along a transverse direction that intersects with the extension direction of the first horizontal members; a temporary fixing step of temporarily fixing a first accommodating recess that is formed in an elongated shape extending in the transverse direction, 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 opposite side of the wall surface, and that accommodates the ends of the plurality of first horizontal members, to the wall surface with a first fixing member while the cushioning material is compressed to a predetermined thickness; and a main fixing step of fixing at least one end of the plurality of first horizontal members to the first extension portion at a distance from the first side plate portion and then removing the first fixing member.

[0009] Here, in the temporary fixing step, it is preferable that a spacer having a thickness in the extension direction is disposed between the wall surface and the first accommodating recess, and the buffer material is compressed by pressing the first accommodating recess until the thickness of the buffer material in the extension direction matches the thickness of the spacer. Also, in the main fixing step, it is preferable that the position of the first fixing member disposed along the intersecting direction does not overlap with the position where the first horizontal member is to be accommodated. [Effects of the Invention]

[0010] Thus, the construction method for a sound-proofing structure of the present invention comprises an attachment process for attaching an elastically deformable cushioning material to a wall surface along a transverse direction that intersects the extension direction of the first horizontal member; a temporary fixing process for temporarily fixing a first accommodating recess that is formed in an elongated shape extending in the transverse direction, has a first side plate portion that contacts the cushioning material and extends in the vertical direction, and a first extension portion that protrudes from the first side plate portion to the opposite side of the wall surface, and accommodates the ends of multiple first horizontal members, to the wall surface with a first fixing member while the cushioning material is compressed to a predetermined thickness; and a final fixing process for fixing at least one end of the multiple first horizontal members to the first extension portion at a distance from the first side plate portion and then removing the first fixing member.

[0011] That is, after the first fixing member temporarily fixes the first accommodating recess to the wall surface via the buffer material, the first fixing member is removed, so that the first accommodating recess remains movable and is attached to the wall surface of the structure without any gaps, thereby preventing sound leakage without compromising vibration isolation.

[0012] Furthermore, in the temporary fixing step, if a spacer having a thickness in the extension direction is disposed between the wall surface and the first accommodating recess, and the buffer material is compressed by pressing the first accommodating recess until the thickness of the buffer material in the extension direction matches the thickness of the spacer, the first accommodating recess compresses the buffer material until the thickness matches the thickness of the spacer, thereby applying a desired repulsive force from the buffer material to the first accommodating recess. Therefore, a desired repulsive force from the buffer material can be obtained easily, stably, and reliably.

[0013] Furthermore, if the first fixing member is placed in a position that does not overlap with the position where the first horizontal member is housed in the intersecting direction in this fixing process, the position where the first fixing member is placed and the position where the first fixing member is attached and detached are different. Therefore, the first fixing member can be easily removed even after the first horizontal member has been housed. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a plan view of a suspended ceiling structure to which a sound-insulating structure according to an embodiment of the present invention is applied. [Figure 2] FIG. 2 is a cross-sectional view taken along the arrow AA in FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view taken along the arrow BB in FIG. [Figure 4] 10 is an enlarged perspective view showing a state in which the edge portion is accommodated in the first accommodating recess. FIG. [Figure 5] 1A to 1C are explanatory diagrams showing the steps of a construction method for a sound-insulating structure according to an embodiment. [Figure 6] 1A to 1C are explanatory diagrams showing the steps of a construction method for a sound-insulating structure according to an embodiment. [Figure 7] FIG. 10 is a view for explaining end treatment of the first accommodating recess. [Figure 8] 10A and 10B are diagrams illustrating another example of end treatment of the first accommodating recess. [Figure 9] 1 is a model of a sound insulation structure according to an embodiment. [Figure 10] 10 is a graph showing the relationship between vibration ratio and vibration transmissibility. [Figure 11] FIG. 1 is an explanatory diagram comparing the experimental results of two evaluation specimens. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a construction method for a sound-insulating structure according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a plan view of a suspended ceiling structure 1 to which a sound-insulating structure according to an embodiment of the present invention is applied, and Figs. 2 and 3 are cross-sectional views of the suspended ceiling structure 1.

[0016] The suspended ceiling structure 1 is installed on the ceiling of a typical wooden house, for example. The ceiling structure of this embodiment can be applied to both existing suspended ceilings and newly installed suspended ceilings.

[0017] 2 and 3, a plurality of vibration-proof suspension bolts 3 serving as suspension members are suspended at intervals from the underside of the floor slab 2 of the upper floor, which constitutes the structural body of the building, and a soffit support portion (second horizontal member) 30 is suspended from the lower end of each vibration-proof suspension bolt 3. A plurality of soffit support portions (first horizontal members) 20 are attached to the lower side of each soffit support portion 30 so as to extend in a direction intersecting with the soffit support portion 30. In the following description, the extension direction of the soffit portion 20 is defined as the X direction, the extension direction of the soffit support portion 30 is defined as the Y direction, and the up-down direction is defined as the Z direction.

[0018] The vibration-proof hanging bolt 3 is composed of an upper bolt 31 located on the floor side, a lower bolt 32 located on the ceiling side, and a pair of vibration-proof materials 33 located between the upper bolt 31 and the lower bolt 32. The upper bolt 31 is a member that connects the vibration-proof material 33 to the floor slab 2, and the lower bolt 32 is a member that connects the vibration-proof material 33 to the joist support portion 30. The vibration-proof material 33 is made of, for example, elastic rubber, polyurethane, silicone, spring, etc., but is not limited to these.

[0019] In this way, the slab frame 20 or slab frame support 30 is provided on the lower side of the floor slab 2 via vibration-isolating material 33. Note that the vibration-isolating material 33 does not have to be provided on either the upper bolt 31 side or the lower bolt 32 side.

[0020] As shown in Figure 1, the siding portion 20 and the siding support portion 30 are provided on the lower side of the floor slab 2 in an intersecting state, as shown in Figures 2 and 3. The siding portion 20 is provided between a pair of opposing first wall surfaces 5a, and both ends are accommodated in the first storage recess 50. The siding support portion 30 is provided between a pair of opposing second wall surfaces 5b, and both ends are accommodated in the second storage recess 60.

[0021] Cushioning material 70 is attached to the first wall surface 5a and the second wall surface 5b. The sill portion 20 is attached to the first wall surface 5a via the first accommodating recess 50 and the cushioning material 70. The sill support portion 30 is attached to the second wall surface 5b via the second accommodating recess 60 and the cushioning material 70.

[0022] 2, the second accommodating recess 60 is configured to have a second side plate portion 61 that contacts the cushioning material 70 and extends in the vertical direction, and a second extending portion 62 that protrudes from the second side plate portion 61 to the side opposite the second wall surface 5b. Also, as shown in Fig. 3, the first accommodating recess 50 is configured to have a first side plate portion 51 that contacts the cushioning material 70 and extends in the vertical direction, and a first extending portion 52 that protrudes from the first side plate portion 51 to the side opposite the first wall surface 5a.

[0023] As shown in Fig. 3, a ceiling material 4 such as gypsum board is attached to the underside of the rough edge portion 20. This ceiling material 4 is a member that forms the ceiling surface. Sound-insulating material 4a is provided between the ceiling material 4 and the first wall surface 5a and the second wall surface 5b.

[0024] 4 is an enlarged perspective view showing the state in which the edge portion 20 is accommodated in the first accommodating recess 50. In the following, the case in which the edge portion 20 is accommodated in the first accommodating recess 50 will be described, but the same applies to the case in which the edge portion receiving portion 30 is accommodated in the second accommodating recess 60.

[0025] As shown in Fig. 4, an elastically deformable cushioning material 70 is attached to the first wall surface 5a. The cushioning material 70 is an elastic backing material or sealing material made of, for example, vibration-isolating rubber, a vibration-damping sheet, or a porous sound-absorbing material. The cushioning material 70 has a 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. Note that the cushioning material 70 may be made up of multiple members arranged at intervals in the horizontal direction.

[0026] The first accommodating recess 50 is an elongated member extending horizontally. The first accommodating recess 50 extends along the cushioning material 70 and is attached to the cushioning material 70. The first accommodating recess 50 accommodates the first end 21 of the edge portion 20.

[0027] The first extension portion 52 is composed of a pair of protruding pieces 52a, 52b that protrude from the first side plate portion 51 toward the edge portion 20, and the first accommodating recess 50 is formed in a U-shape when viewed from the side by the first side plate portion 51 and the pair of protruding pieces 52a, 52b.

[0028] The first accommodating recess 50 is fixed to the wall 5 by a plurality of first fixing members 72. Each of the plurality of first fixing members 72 is arranged at a position on the first side plate 51 along the extension direction (Y direction) of the first accommodating recess 50 so as not to overlap with the edge portion 20.

[0029] In addition, the first extension portion 52 may have only one of the protruding pieces 52a, 52b, and the first accommodating recess 50 may be configured in an L-shape when viewed from the side by the first side plate portion 51 and one of the pair of protruding pieces 52a, 52b.

[0030] Next, each step of the construction method for the soundproof structure will be described with reference to Figures 5 and 6. Note that, although the step of accommodating the fringe portion 20 in the first accommodating recess 50 will be described below, the step of accommodating the fringe support portion 30 in the second accommodating recess 60 is also performed through a similar procedure. Also, although the description will be given for one end of the fringe portion 20, the same applies to the other end.

[0031] 5, the elastically deformable cushioning material 70 is attached to the first wall surface 5a in a transverse direction (Y direction) that intersects with the extension direction (X direction) of the edge portion 20, which is the first horizontal member (attachment step). That is, in step 1, the cushioning material 70 is adhered with an adhesive or the like to the first wall surface 5a at a position at the same height as the intended attachment position of the first accommodating recess 50.

[0032] Next, in steps 2 and 3, with the cushioning material 70 compressed to a predetermined thickness, the first accommodating 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 extension direction (X direction) of the edge portion 20 is disposed between the first wall surface 5a and the first accommodating recess 50, and the cushioning material 70 is compressed by pressing the first accommodating recess 50 until the thickness of the cushioning material 70 matches the thickness of the spacer 71 in the extension direction of the edge portion 20.

[0033] The spacer 71 arranged between the first side plate portion 51 and the first wall surface 5a is a member that is thinner than the buffer material 70, and may be any member that is a flat plate-like member having a predetermined thickness, such as a steel plate, a wooden plate, a plastic plate, etc.

[0034] 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 the cushioning material 70. The first side plate portion 51 continues to press the cushioning material 70 until the thickness of the cushioning material 70 matches the thickness of the spacer 71. The first fixing member 72 only needs to be attached at a position that does not overlap with the position where the edge portion 20 is disposed in the extension direction of the first accommodating recess 50. In other words, the position of the first fixing member 72 that is disposed along the extension direction of the first accommodating recess 50 only needs to be a position that does not overlap with the position where the edge portion 20 is to be accommodated.

[0035] The temporary fixing steps of steps 2 and 3 may be performed with the edge portion 20 already accommodated in the first accommodating recess 50. However, the fixing of the edge portion 20 and the first side plate portion 51 by the second fixing member 73 is performed after the temporary fixing steps are completed.

[0036] In the next step 4, the edge portion 20 is accommodated in a position that does not overlap with the position where the first fixing member 72 is arranged in the extension direction of the first accommodating recess 50. That is, as shown in step 4 of Figure 6, the edge portion 20 is accommodated in the first accommodating recess 50 that is fixed to the first wall surface 5a.

[0037] Here, when the edge portion 20 is accommodated in the first accommodation recess 50, the first end portion 21 of the edge portion 20 is disposed at a distance from the first side plate portion 51. In addition, the edge portion 20 is fixed to the lower protruding piece 52b protruding from the first side plate portion 51 by the second fixing member 73.

[0038] In this way, the first end portion 21 is positioned at a distance from the first side plate portion 51 because the dimension in the extension direction of the fringe portion 20 is smaller than the dimension between the first wall surfaces 5a, and this dimensional difference makes it easier to accommodate the fringe portion 20 in the first accommodating recess 50.

[0039] In the next step 5, the first end 21 of at least one of the plurality of edge portions 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 (main fixing step). In short, it is sufficient that at least one edge portion 20 of the plurality of edge portions 20 is fixed to the first accommodating recess 50.

[0040] Furthermore, the spacer 71 and the first fixing member 72 are removed, since they are no longer necessary due to the first accommodating recess 50 being fixed to the edge portion 20. Note that the first fixing member 72 is positioned so as not to overlap with the edge portion 20 in the direction in which the first accommodating recess 50 extends, and therefore the first fixing member 72 can be easily removed.

[0041] In the final step 6, the ceiling material 4 extending in the extension direction (X direction) of the furring strip 20 and in the intersecting direction (Y direction) intersecting the extension direction is fixed to the lower side of the furring strip 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.

[0042] It is desirable that the sound-insulating material 4a be an elastic filler such as an elastic sealing material, but any elastic material that can seal the gap between the ceiling material 4 and the first wall surface 5a may be used.

[0043] By the above procedure, the plurality of elongated edge portions 20 are attached to the first wall surface 5a via the first accommodating recess 50. This allows the force acting from the edge portions 20 to the cushioning material 70 to be transmitted more uniformly (evenly) and stably than when only the plurality of edge portions 20 press against the cushioning material 70 alone. In short, since the load can be applied from the edge portions 20 to the first wall surface 5a in a more planar manner, variation due to construction accuracy can be reduced.

[0044] 7 is a diagram illustrating the end treatment of the first accommodating recess 50. When the edge portion 20 is accommodated in the first accommodating recess 50, the first side plate portion 51 of the first accommodating recess 50, which is U-shaped in side view, comes into surface contact with the first wall surface 5a via the buffer material 70.

[0045] In order to properly handle vertical impacts from the floor structure above when the first accommodating recess 50 is in contact with the buffer material 70, it is desirable that the first accommodating recess 50 be smooth relative to the buffer material 70. In other words, it is desirable that frictional force above a certain level does not act between the first accommodating recess 50 and the buffer material 70.

[0046] Here, assuming that the impact force input to the ceiling due to an impact from the floor structure above is F, the force required to deflect the buffer material 70 by a predetermined amount is F', and μ is the coefficient of static friction occurring between the first storage recess 50 and the buffer material 70, the condition under which the ceiling substrate will be displaced vertically relative to the floor structure is as follows: F<μF' The following relation holds true.

[0047] Here, if the conditions for effective vibration isolation performance of the ceiling are that the impact force input to the floor structure is greater than that of a person walking and the natural frequency of the buffer material 70 is approximately 10 Hz or less, then the static friction coefficient μ should desirably be 0.7 or less. This can be achieved by forming the first side panel portion 51 with a smooth metal surface such as iron, and forming the buffer material 70 from vibration-isolating rubber, vibration-damping sheet, or porous sound-absorbing material (such as glass wool or rock felt), or by covering the surface of the buffer material 70 with a nonwoven fabric or the like. Note that the static friction coefficient μ should desirably be as small as possible, and may be 0.1 or less.

[0048] In order to ensure smoothness between the first accommodating recess 50 and the buffer material 70, it is desirable to provide a friction reduction member 75 between the first accommodating recess 50 and the buffer material 70 as shown in Fig. 8. The friction reduction member 75 may be made of a polytetrafluoroethylene resin material such as Teflon (registered trademark), which has a low coefficient of friction. The friction reduction member 75 may be fixed to either the first accommodating recess 50 side or the buffer material 70 side with an adhesive or the like.

[0049] Fig. 9 is a schematic diagram showing a theoretical model of a conventional sound insulation structure, and Fig. 10 is a graph showing the relationship between vibration ratio and vibration transmissibility. As shown in Fig. 9, in the conventional theoretical model, the mass of the ceiling material 4 is m, the spring constant of the vibration-isolating suspension bolt 3 is K, and the viscous resistance is C1. In addition to these, a new resistance C2 is added in the end treatment. Note that the resistance C2 controlled in the present invention is the friction force μF'. The ratio of the impact force F1 input to the ceiling material 4 to the force F2 transmitted to the floor structure, i.e., the vibration transmissibility in the vertical direction between the floor structure and the ceiling, can be expressed by the following equation (1):

number

[0050] The damping ratio ζ and the vibration ratio η can be expressed by the following equations (2) and (3), respectively.

number

number

number

[0051] In addition, the horizontal vibration transmissibility between the wall and ceiling can be expressed by the following equation (5).

number

[0052] The natural frequency of the buffer material 70 can be expressed by the following equation (6).

number

[0053] 10, as the damping ratio ζ increases, the amplification at the resonant frequency decreases and the vibration-damping effect also decreases. Therefore, in order to reduce variations due to the construction accuracy when attaching the rough edge portion 20 to the first wall surface 5a and to reliably obtain the vibration-damping effect, it is necessary to increase the vibration ratio η so that the vibration transmissibility is below a certain level, that is, to ensure that the cushioning material 70 has an arbitrary deflection amount so that the natural frequency of the cushioning material 70 is below a certain level, and in addition, it is necessary to satisfy the condition of the static friction coefficient μ necessary to keep the friction force between the first housing recess 50 and the cushioning material 70, which occurs when ensuring the deflection amount of the cushioning material 70, below a certain level.

[0054] 11 is an explanatory diagram comparing the experimental results of two evaluation specimens. Here, an experiment was conducted to compare the sound insulation structure according to this embodiment with a conventional ceiling structure fixed to a wall surface.

[0055] In the experiment, vibration-isolating hanger material with vibration-isolating rubber having a dynamic spring constant of 150 N / mm was used as the vibration-isolating hanging bolt 3, a material consisting of two layers of 12.5 mm thick gypsum board material was used as the ceiling material 4, a silicone product was used as the sound-proofing material 4a, and rock wool felt material with a static friction coefficient of around 0.3 was used as the buffer material 70. Furthermore, long materials formed by bending steel plate were used for the rafter portion 20, first storage recess 50, rafter support portion 30, and second storage recess 60.

[0056] Here, it can be seen that in both the case of a heavy impact source shown in Fig. 11(a) and the case of a light impact source shown in Fig. 11(b), the sound insulation structure according to this embodiment reduces the vibration acceleration level more than the conventional ceiling structure. The conventional ceiling structure used in the experiment had the same component configuration as the above-mentioned components, with the ceiling underlayment (rough edge portion 20) fixed to the wall surface. As described above, in this embodiment, by attaching the elongated rough edge portion 20 to the first wall surface 5a via the first housing recess 50 using the above-mentioned construction procedure, variation due to construction accuracy is reduced, and the vibration-damping effect is improved by increasing the deflection of the buffer material 70 and reducing the natural frequency f0.

[0057] In this way, the sound-proofing structure of the embodiment is formed in an elongated shape extending in a direction intersecting the extension direction of the rough edge portions (first horizontal members) 20, and comprises a first accommodating recess 50 that accommodates the first end portions 21 of the multiple rough edge portions 20, and an elastically deformable cushioning material 70 that is provided between the first accommodating recess 50 and the first wall surface 5a, and the first accommodating recess 50 has a first side plate portion 51 that contacts 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 the first wall surface 5a, and the first end portion 21 of at least one of the multiple rough edge portions 20 is fixed to the first extension portion 52 at a distance from 51.

[0058] As a result, the first storage recess 50 is attached to the first wall surface 5a of the wall portion 5 constituting the floor slab (structure) 2 via the buffer material 70 in an unfixed state. In other words, the first storage recess 50 is attached to the first wall surface 5a in a pressed state with no gaps while maintaining a state in which it can move up and down relative to the first wall surface 5a. Therefore, sound leakage can be prevented without compromising the vibration-proofing properties of the suspended ceiling. It is also possible to prevent vibrations from being transmitted from the wall surface to the ceiling.

[0059] In particular, if the buffer material 70 is provided between the first side plate portion 51 of the first accommodating recess 50 and the first wall surface 5a in a state where it is stably elastically deformed to a desired thickness (deformation amount), it is possible to accurately damp vibrations propagating from the wall surface to the ceiling. Also, it is possible to improve the adhesion between the first accommodating recess 50 and the buffer material 70. Therefore, it is possible to further improve the effect of preventing sound leakage.

[0060] Furthermore, when the static friction coefficient between the first side plate portion 51 and the buffer material 70 is 0.7 or less, friction is unlikely to occur between the first side plate portion 51 and the buffer material 70. Therefore, the first accommodating recess 50 can move more easily in the up and down direction, further improving vibration damping properties.

[0061] Furthermore, if a friction reducing member 75 is provided between the first accommodating recess 50 and the cushioning material 70, it is possible to prevent friction from occurring between the first side plate portion 51 and the cushioning material 70. This makes it easier for the first accommodating recess 50 to move in the up and down direction, further improving vibration damping properties.

[0062] The soundproofing structure also includes a plurality of sill support members (second horizontal members) 30 extending in a direction intersecting the extension direction of the sill members 20, a long second housing recess 60, and an elastically deformable cushioning material provided between the second housing recess 60 and the second wall surface 5b. The second housing recess 60 has a second side plate 61 that contacts the cushioning material and extends in the vertical direction, and a second extending portion 62 that protrudes from the second side plate 61 to the side opposite the second wall surface 5b. When at least one end of the plurality of sill support members 30 is fixed to the second extending portion 62 at an interval from the second side plate, the sill support member 30 extending in a direction intersecting the extension direction of the sill members 20 is attached to the second wall surface 5b of the wall 5 without any gaps while remaining movable. This prevents sound leakage without impairing vibration-proofing properties.

[0063] Furthermore, if a ceiling material 4 is provided below the siding 20 and sound-insulating material 4a is placed between the ceiling material 4 and the first and second walls 5a and 5b, radiated and transmitted sound from the upper floors can be blocked from reaching the lower floors. This further improves the sound-insulating performance of the sound-insulating structure.

[0064] In addition, the construction method of the soundproof structure includes an attachment process of attaching an elastically deformable cushioning material 70 to the first wall surface 5a along a transverse direction that intersects with the extension direction of the rough edge portions 20; a temporary fixing process of compressing the cushioning material 70 to a predetermined thickness using a first fixing member 72 to temporarily fix a first accommodating recess 50 that is formed in an elongated shape extending in the transverse direction, 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 opposite side of the first wall surface 5a, and accommodates the ends of the multiple rough edge portions 20; and a main fixing process of fixing at least one end of the multiple rough edge portions 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.

[0065] That is, after the first accommodating recess 50 is temporarily fixed to the first wall surface 5a via the buffer material 70 by the first fixing member 72, the spacer 71 and the first fixing member 72 are removed, whereby the first accommodating recess 50 is attached to the first wall surface 5a of the wall portion 5 without any gaps while maintaining a movable state. Therefore, sound leakage can be prevented without impairing vibration-proofing properties.

[0066] Furthermore, in the temporary fixing step, a spacer having a thickness in the extension direction is disposed between the first wall surface 5a and the first accommodating recess 50, and when the first accommodating recess 50 is compressed against the buffer material 70 until the thickness of the buffer material 70 in the extension direction matches the thickness of the spacer, the first accommodating recess 50 compresses the buffer material 70 until the thickness matches the thickness of the spacer, thereby applying a repulsive force from the buffer material 70 to the first accommodating recess 50. This makes it possible to reliably obtain the repulsive force from the buffer material 70. This makes it possible to accurately damp vibrations propagating from the wall surface to the ceiling.

[0067] In addition, in this fixing process, if the position of the first fixing member 72 arranged along the cross direction is set to a position that does not overlap with the position where the fringe portion 20 is accommodated, the position where the first fixing member 72 is arranged and the position where the first fixing member 72 is attached and detached are different. Therefore, even after the fringe portion 20 is accommodated, the first fixing member 72 can be easily removed.

[0068] Each embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to these embodiments, and design changes that do not deviate from the gist of the present invention are included in the present invention. [Explanation of symbols]

[0069] 1: Suspended ceiling structure 2: Floor slab (structure) 3: Anti-vibration hanging bolt 31: Upper bolt 32: Lower bolt 33: Vibration isolating material 4: Ceiling material 4a: Sound insulation material 5: Wall 5a: 1st wall 5b: Second wall 20: Rough edge (first horizontal member) 21 :First end 30: Rafter support (second horizontal member) 50: First storage recess 51:First side plate part 52: 1st extension part 60: Second storage 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 material

Claims

1. In a suspended ceiling structure having a plurality of first horizontal members suspended from a structural body of a building and extending in a horizontal direction, a construction method for a sound insulation structure provided between the plurality of first horizontal members and a wall surface of the structural body facing each end of the plurality of first horizontal members, comprising: an attachment step of attaching an elastically deformable buffer material to the wall surface along a direction intersecting the extending direction of the first horizontal member; a temporary fixing process in which a first accommodating recess, which is formed in an elongated shape extending in the intersecting direction, has a first side plate portion that contacts the buffer material and extends in the vertical direction, and a first extending portion that protrudes from the first side plate portion to the side opposite the wall surface, and which accommodates ends of the plurality of first horizontal members, is temporarily fixed to the wall surface with a first fixing member in a state in which the buffer material is compressed to a predetermined thickness; a final fixing process in which 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, and then the first fixing member is removed.

2. In the temporary fixing step, a spacer having a thickness in the extending direction is disposed between the wall surface and the first accommodating recess, 2. The method for constructing a sound-insulating structure according to claim 1, wherein the buffer material is compressed by pressing the first accommodating recess until a thickness of the buffer material in the extension direction becomes equal to a thickness of the spacer.

3. 3. The sound-proofing structure construction method according to claim 1, wherein in the main fixing process, the position of the first fixing member arranged along the intersecting direction is set so as not to overlap with the position where the first horizontal member is accommodated.

Images