JP2020165124A - Ceiling vibration isolation material and ceiling vibration isolation structure - Google Patents

Abstract

To provide a ceiling vibration isolation material and a ceiling vibration isolation structure having a vibration isolation property against floor impact sound in a wide range of frequency band without depending on weight.SOLUTION: A ceiling vibration isolation material 10 laid over opposing ceiling backing materials 20 in the ceiling backing materials 20 supporting a ceiling surface material 40 comprises: a hat material 3 of a hat shape in a front view in which left and right L-shaped locking pieces 1 locked to the ceiling backing materials 20 and a bottom piece 2 connecting the left and right locking pieces 1 are integrated; and a vibration isolators 5 which is attached to each of the right and left sides of the bottom surface 2a of the bottom piece 2 and is brought into contact with the ceiling surface material 40 in a compressed state within a compression ratio of 10% to 20%.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ceiling vibration isolator and a ceiling vibration isolator structure.

The floor impact sound of the upper floor of the building is propagated to the ceiling of the lower floor below through the floor of the upper floor, and the floor impact sound is radiated to the lower floor by exciting the ceiling of the lower floor. To. The floor impact sound includes a heavy floor impact sound of about 63 Hz and a lightweight floor impact sound of about 256 Hz to 500 Hz.

For example, a ceiling surface material made of gypsum board or the like is fastened to a ceiling base material (field edge, field edge receiver, etc.) assembled in a grid pattern, and the ceiling base material is a hanging tree hanging from a floor beam. Be supported. Of the ceiling surface materials, the vibration of the portion directly fastened to the ceiling base material is suppressed, but the portion between the grid-shaped ceiling base materials that is not directly fastened tends to vibrate.

Therefore, there is a measure to dispose a ceiling vibration isolator made of a relatively heavy sound insulation sheet on the entire back surface of the ceiling surface material. In this way, a heavy sound insulation sheet is arranged on the entire upper surface of the ceiling surface material. It is known that even if it is installed, the floor impact noise cannot always be reduced. Further, disposing the sound insulation sheet on the entire surface leads to an increase in material cost, which is not preferable from the viewpoint of construction cost. Further, if the weight of the ceiling vibration isolator becomes too heavy due to the heavy sound insulation sheet, it may lead to a weight burden on the structural frame of the building. A similar problem may occur in a measure for reducing vibration of the ceiling surface material by applying a reinforced gypsum board or the like to the ceiling surface material to increase the weight of the ceiling surface material itself. Therefore, a ceiling vibration isolator with excellent vibration isolation performance that can effectively reduce both heavy floor impact noise and lightweight floor impact noise while arranging a lightweight ceiling vibration isolator with as small an area as possible. The development of a ceiling vibration isolation structure is desired.

Here, a dynamic damper having a central portion corresponding to a heavy floor impact sound and two left and right end portions corresponding to a lightweight floor impact sound has been proposed for the ceiling base material. The dynamic damper consists of a mass body (referred to as the first mass body) locked to the left and right field edges and a mass body (referred to as the second mass body) placed as a weight above the center position of the first mass body. ). This first mass body is divided into three regions in the longitudinal direction, a second mass body is placed above the central region, and below each region, it is mutually divided corresponding to each region. An elastic body is attached. It is said that the left and right regions where the second mass body is not loaded can reduce the lightweight floor impact sound, and the central region where the second mass body is loaded can reduce the heavy floor impact sound (see, for example, Patent Document 1). ).

JP-A-2018-28177

According to the dynamic damper described in Patent Document 1, heavy floor impact noise can be reduced in the central region, and lightweight floor impact noise can be reduced in the left and right end regions. By the way, in general, a vibration-proof material tuned to, for example, about 256 Hz to 500 Hz so as to reduce a lightweight floor impact sound resonates at about 63 Hz in terms of vibration-proof design, so that a heavy floor impact sound of about 63 Hz can be obtained. May have an adverse effect. In the dynamic damper described in Patent Document 1, since the region for reducing the lightweight floor impact sound is set in a relatively wide range at the left and right ends in this way, a solid body with a heavy floor impact sound of around 63 Hz. It can be a propagation path. Further, in the central region for reducing the heavy floor impact sound, since the second mass body is placed on the first mass body, the weight of the anti-vibration material becomes heavier, and the weight of the vibration isolator becomes heavier with respect to the structural frame of the building. It involves issues such as the burden of weight.

The present invention has been made in view of the above problems, and provides a ceiling vibration isolator and a ceiling anti-vibration structure having vibration isolation against floor impact sound in a wide frequency band without depending on weight. It is an object.

In order to achieve the above object, one aspect of the ceiling vibration isolator according to the present invention is
In the ceiling base material that supports the ceiling surface material, it is a ceiling vibration isolator that is bridged over the ceiling base material that faces the ceiling.
A front-view hat-shaped hat material in which the left and right L-shaped locking pieces locked to the ceiling base material and the bottom piece connecting the left and right locking pieces are integrated.
It is characterized by having a vibration-proof material which is attached to two places on the left and right of the bottom surface of the bottom piece and is brought into contact with the ceiling surface material in a state of being compressed in a compression ratio of 10% to 20%. ..

According to this aspect, the anti-vibration material is brought into contact with the ceiling surface material in a state of being compressed in a compression ratio of 10% to 20%, so that the ceiling surface due to the floor impact sound of the upper floor When the material vibrates, the compressed vibration-proof material elastically deforms while following the vibration of the ceiling surface material, effectively reducing the vibration of the ceiling surface material caused by the floor impact sound on the upper floor. Can be done. For example, in a state where the hat material is laid over the ceiling base material, the ceiling surface material has a compression ratio of 10% to 20% (for example, a number as the compression amount) of the vibration isolator attached to the bottom surface of the hat material. It can be attached to the ceiling base material in a compressed state (about mm). That is, in the ceiling anti-vibration material of this embodiment, when the hat material is laid over the ceiling base material, the anti-vibration material is pressed by the ceiling surface material and the anti-vibration material is compressed in the range of 10% to 20%. As described above, the height of the locking piece of the hat material and the thickness of the anti-vibration material are set.

The anti-vibration material has a thickness of about several mm to a dozen mm, and therefore it is difficult to set the compression ratio to less than 10%. Further, if the compression rate exceeds 20%, the vibration isolator is compressed too much and the responsiveness to vibration deteriorates, so that it is difficult to obtain sufficient vibration isolation. For these reasons, the compressibility of the anti-vibration material is specified in the range of 10% to 20%. Here, for example, a steel hat material or a relatively hard resin hat material is applied to the hat material, and it is preferable that the hat material has a certain weight. This is because it is difficult to obtain sufficient anti-vibration properties when the anti-vibration material is compressed and the hat material is too light and warps upward.

At the construction stage where the hat material is laid over the ceiling base material, the locking piece is locked to the ceiling base material, but the ceiling surface material is attached to the ceiling base material, and the vibration isolator is lowered by the ceiling surface material. At the stage of completion of construction, which is pressed from the ceiling and compressed at a predetermined compression rate, the locking piece may be kept locked to the ceiling base material, or the locking piece may be lifted from the ceiling base material. It may be in a state. Since the ceiling anti-vibration material has a locking piece, not only can the ceiling anti-vibration material be locked to the ceiling base material during construction, but also it is possible to prevent the ceiling anti-vibration material from falling during an earthquake, for example.

In addition, the method of attaching the ceiling surface material to the ceiling base material is generally that after attaching the ceiling surface material at the end of the ceiling, a new ceiling surface material is attached to the installed ceiling surface material so as to align the joints. While sliding it, fasten it to the ceiling base material. If the anti-vibration material is attached to one place (for example, the center position) on the bottom surface of the bottom piece of the hat material, one anti-vibration material is attached when the ceiling surface material is slid and fastened as described above. When it is dragged laterally from the sliding ceiling surface material, it receives a shearing force, and the vibration isolator tends to have a distribution of compression amount (or compression ratio) for each part. If there is a distribution of the amount of compression (or compression ratio) for each part of the anti-vibration material, the anti-vibration material may not exhibit its initial anti-vibration performance. Therefore, in the ceiling anti-vibration material of this embodiment, the shearing applied to the ceiling surface material that is fastened while sliding is provided by attaching the anti-vibration material to the left and right two places on the bottom surface of the bottom piece of the hat material. By distributing the force to the two left and right anti-vibration materials, the distribution of the amount of compression (or compression rate) due to the shearing force of each anti-vibration material can be reduced, and the initial anti-vibration performance of the anti-vibration material can be guaranteed. I have to.

Another aspect of the ceiling vibration isolator according to the present invention is characterized in that the hardness of the anti-vibration material is in the range of 1 degree to 20 degrees.

According to this aspect, since the hardness of the anti-vibration material is in the range of 1 degree to 20 degrees, it can be easily compressed in the above-mentioned range of 10% to 20% of the compressibility at the time of construction, and the anti-vibration property is improved. An excellent ceiling vibration isolator can be formed. The hardness of the anti-vibration material is more preferably in the range of 1 degree to 5 degrees, even in the range of 1 degree to 20 degrees.

Further, in another aspect of the ceiling vibration isolator according to the present invention, the hat material is a steel hat material, and the thickness of the hat material is in the range of 3.2 mm to 4.5 mm.

According to this aspect, since the hat material is a steel hat material and its thickness is in the range of 3.2 mm to 4.5 mm, the hat material has an appropriate weight, and the ceiling is installed at the construction stage. The anti-vibration material can be compressed in the above range of 10% to 20% by the hat material that is only locked to the base material. Further, since the hat material is not too light, the hat material is suppressed from warping upward when the vibration isolator is compressed, and sufficient vibration isolation by the vibration isolator is guaranteed.

Moreover, one aspect of the ceiling vibration isolation structure according to the present invention is
It has a ceiling surface material, a ceiling base material that supports the ceiling surface material, and the ceiling vibration isolator that is bridged over the ceiling base material that faces the ceiling surface material.
The anti-vibration material is in contact with the ceiling surface material in a state of being compressed to a compression ratio of 10% to 20%.

According to this aspect, since the anti-vibration material is in contact with the ceiling surface material in a state of being compressed in a compression ratio of 10% to 20%, the ceiling surface material is caused by the floor impact sound of the upper floor. When vibrated, the compressed anti-vibration material elastically deforms while following the vibration of the ceiling surface material, and the ceiling surface material due to the floor impact sound (heavy floor impact sound and lightweight floor impact sound) in a wide frequency band. Vibration can be effectively suppressed. Here, the vibration isolator is compressed in the range of 10% to 20%, and by tuning the vibration isolator around 63 Hz, which is the frequency band of heavy floor impact sound, the frequency and vibration transmission rate of the sound. Based on the general relationship between, for example, a lightweight floor impact sound in a frequency band of about 256 Hz to 500 Hz can also be vibration-proofed.

In addition, another aspect of the ceiling vibration isolation structure according to the present invention is characterized in that the hat material is fixed to the ceiling base material.

According to this aspect, since the locking piece of the hat material and the ceiling base material are fixed with screws, nails, etc., rattling between the hat material and the ceiling base material when the ceiling base material vibrates. The generation of sound can be suppressed. When the hat material is thick and relatively heavy, the locking piece may come into contact with the ceiling base material in a state where the vibration isolator is pressed against the ceiling surface material and compressed. In such a case, if the locking piece is simply locked to the ceiling base material, there is a concern that a rattling noise may be generated between the two, and thus this rattling noise is suppressed.

As can be understood from the above description, according to the ceiling vibration isolating material and the ceiling anti-vibration structure of the present invention, it is possible to isolate the floor impact sound in a wide frequency band without depending on the weight.

It is a perspective view of the ceiling vibration isolation material which concerns on embodiment. It is a construction process drawing of the ceiling vibration isolation structure which concerns on embodiment, and is the figure which shows the state which the ceiling vibration isolation material is locked with the ceiling base material. FIG. 2 is a view taken along the line III in FIG. It is a construction process drawing of the ceiling vibration isolation structure following FIG. 2, and is the figure which shows the state which the ceiling surface material is attached to the ceiling base material while sliding in the lateral direction. It is a construction process drawing of the ceiling vibration isolation structure following FIG. 4, and is the figure which shows the state which the ceiling surface material is attached to the ceiling base material, and the ceiling vibration isolation structure is formed. (A) is a front view showing an embodiment in which the ceiling vibration isolator is not fixed to the ceiling base material, and (b) is a front view showing an embodiment in which the ceiling vibration isolator is fixed to the ceiling base material. Is.

Hereinafter, the ceiling anti-vibration material and the ceiling anti-vibration structure according to the embodiment will be described with reference to the attached drawings. In the present specification and drawings, substantially the same components may be designated by the same reference numerals to omit duplicate explanations.

[Ceiling anti-vibration material according to the embodiment]
First, the ceiling vibration isolator according to the embodiment will be described with reference to FIG. Here, FIG. 1 is a perspective view of the ceiling vibration isolator according to the embodiment. In the explanation of the ceiling vibration isolator, FIG. 2 and the like will be referred to as appropriate. In the ceiling vibration isolator 10 shown, the left and right L-shaped locking pieces 1 that are locked to the ceiling base material 20 (see FIG. 2) and the bottom piece 2 that connects the left and right locking pieces 1 are integrated. It has a front-view hat-type hat material 3 and anti-vibration materials 5 attached to the left and right sides of the bottom surface 2 of the bottom piece 2.

The hat material 3 is made of steel and is relatively heavy. As will be described in detail below, when the vibration isolator 5 is pressed by the ceiling surface material from below, the hat material 3 and the ceiling surface material provide the vibration isolator. It has a weight sufficient to compress 5 at a predetermined compression rate. The thickness t1 of the hat material 3 is in the range of 3.2 mm to 4.5 mm, and since the hat material 3 is a steel member having a thickness t1 in this range, it has the above-mentioned appropriate weight. In addition to the steel member, the hat material 3 may be a resin member that is relatively hard and has an appropriate weight.

The anti-vibration material 5 is set so as to come into contact with the ceiling surface material 40 (see FIG. 5) in a state of being compressed in a compression ratio of 10% to 20%. The anti-vibration material 5 is formed of a foaming resin such as urethane foam, rubber, or the like. As an example, the dimensions of the anti-vibration material 5 are such that t3 × t4, which is a plane dimension, is about 20 mm × 40 mm, and the thickness t2 is about 20 mm. In the form where the thickness t2 is 20 mm, the vibration isolator 5 is compressed by 2 mm to 4 mm when the compression ratio is compressed in the range of 10% to 20%.

Further, the hardness of the vibration isolator 5 is set in the range of 1 degree to 20 degrees. The hardness of the anti-vibration material 5 formed of urethane foam or the like is measured using a durometer based on the JIS standard. There are two methods for measuring the hardness of urethane foam, which is an example of the material of the vibration isolator 5, a physical test method for a thermosetting polyurethane elastomer molded product of JIS K 7312 and JIS K 6400. In this embodiment, there are two methods. For example, from the viewpoint of mainly using urethane foam with a low foaming ratio of 5 times or less, based on JIS K 7312, which is the same measurement method as elastomer, C type or F type of Asker rubber hardness tester (durometer) is used. The hardness of the vibration isolator 5 is measured. As a supplementary description, JIS K 6400 is generally applied to urethane foam or the like having a foaming ratio of more than 20 times.

When the hardness of the anti-vibration material 5 is in the range of 1 degree to 20 degrees, the anti-vibration material 5 is likely to be compressed in the above-mentioned compression ratio of 10% to 20% at the time of construction.

[Ceiling anti-vibration structure according to the embodiment]
Next, with reference to FIGS. 2 to 6, the ceiling vibration isolation structure according to the embodiment will be described together with the construction direction thereof. Here, FIG. 2 is a construction process diagram of the ceiling vibration isolation structure according to the embodiment, and is a diagram showing a state in which the ceiling vibration isolation material is locked to the ceiling base material, and FIG. 3 is a diagram showing FIG. It is a view of the arrow in the direction of III. Further, FIG. 4 is a construction process diagram of the ceiling anti-vibration structure following FIG. 2, which shows a state in which the ceiling surface material is attached to the ceiling base material while sliding in the lateral direction. Further, FIG. 5 is a construction process diagram of the ceiling anti-vibration structure following FIG. 4, showing a state in which the ceiling surface material is attached to the ceiling base material to form the ceiling anti-vibration structure.

As shown in FIG. 2, below the floor material 30 on the upper floor, a field edge 20 which is a ceiling base material constituting the ceiling on the lower floor is arranged. More specifically, as shown in FIG. 3, a plurality of field edges 20 are arranged in parallel in the horizontal direction at predetermined intervals, and extend in a direction orthogonal to each field edge 20. The field edge receiver 25 is fixed to each field edge 20 with a screw or the like. The field edge receiver 25 is hung from a floor beam (not shown) formed of a shaped steel material such as H-shaped steel via a hanging tree (not shown) such as a hanging bolt. The field edge 20 and the field edge receiver 25 are formed of a shaped steel material such as a wooden crosspiece or a channel steel. Further, the floor material 30 is formed of, for example, an ALC (Autoclaved Lightweight Concrete) plate or the like.

The ceiling anti-vibration material 10 is locked by the left and right locking pieces 1 of the hat material 3 constituting the ceiling anti-vibration material 10 with respect to the left and right field edges 20 arranged at predetermined intervals. Is temporarily fastened to the field edge 20. In FIG. 2, in a state where the ceiling vibration isolator 10 is locked to the field edge 20, the lower end of the vibration isolator 5 projects downward from the lower surface 20a of the field edge 20, and the protruding length t5 is the compression described above. It is a length that satisfies the rate of 10% to 20%. For example, in the form where the thickness t2 of the vibration isolator 5 is 20 mm, the protrusion length t5 is 2 mm to 4 mm, which corresponds to a compression rate of 10% to 20%. That is, in a state where the hat material 3 is stretched over the field edge 20, the anti-vibration material 5 is compressed by the ceiling surface material 40 (see FIG. 5) so as to be compressed in the range of 10% to 20%. The height t6 of the locking piece 1 of the hat material 3 and the thickness t2 of the anti-vibration material are set.

As shown in FIGS. 2 and 3, after a plurality of ceiling anti-vibration materials 10 are bridged to each field edge 20, as shown in FIG. 4, the ceiling surface material 40 formed of gypsum board or the like is used. Attach it to the edge 20. Here, the method of attaching the ceiling surface material 40 is generally new to the attached ceiling surface material 40 by aligning the joints after attaching the ceiling surface material 40 at the end of the ceiling shown on the left side of FIG. The ceiling surface material 40 is slid diagonally in the X direction and fastened to the field edge 20.

At this time, since the lower end of the vibration isolator 5 projects slightly downward from the lower surface of the field edge 20, the vibration isolator 5 is compressed by a predetermined amount when the ceiling surface material 40 is fastened to the field edge 20. Can be done. Here, if the anti-vibration material 5 is attached to one place (for example, the central position) of the bottom surface 2a of the bottom piece 2 of the hat material 3, when the ceiling surface material 40 is slid and fastened as described above. In addition, when one anti-vibration material 5 is dragged laterally from the sliding ceiling surface material 40, it receives a shearing force S, and the anti-vibration material 5 tends to have a compression ratio distribution for each part. If the compression ratio is distributed for each part of the vibration isolator 5, the vibration isolator 5 may not exhibit the initial vibration isolation performance.

Therefore, in the illustrated ceiling vibration isolator 10, the anti-vibration material 5 is attached to the left and right two places of the bottom surface 2a of the bottom piece 2 of the hat material 3, so that the ceiling surface material 40 is fastened while sliding. By distributing the shearing force S to be applied to the two left and right anti-vibration materials 5, the distribution of the compression ratio due to the shearing force S of each anti-vibration material 5 can be reduced, and the initial anti-vibration performance of the anti-vibration material 5 can be improved. It is possible to guarantee.

Further, as the vibration isolator 5, a material having a thickness t2 of about several mm to a dozen mm is applied. Therefore, since it is difficult to set the compression rate to less than 10% in terms of accuracy, the lower limit of the compression rate is defined as the above 10%. Further, when the anti-vibration material 5 is compressed at a compression rate of more than 20%, the anti-vibration material 5 is compressed too much and the responsiveness to the vibration of the ceiling surface material 40 deteriorates, so that it is difficult to obtain sufficient anti-vibration properties. Therefore, the upper limit of the compression rate is set to 20% as described above.

As shown in FIG. 5, by fixing the ceiling surface material 40 to the field edge 20 with screws or the like, the vibration isolator 5 is pressed by the ceiling surface material 40 from below with a pressing force P, and at the same time. By being pressed by the shared load W of the weight of the hat material 3 from above, the ceiling anti-vibration structure 50 is formed in contact with the ceiling surface material 40 in a state of being compressed to a compression ratio of 10% to 20%. Will be done. The space G1 between the floor material 30 and the ceiling surface material 40 may be filled with glass wool, rock wool, or the like to form a heat insulating material layer.

Here, the locking piece 1 of the hat material 3 constituting the ceiling vibration isolator 10 is not fixed to the field edge 20 which is the ceiling base material as shown in FIG. 6A. Alternatively, it may be fixed by a screw or the like as shown in FIG. 6B.

When the anti-vibration material 5 is pressed by the ceiling surface material 40 from below, when the locking piece 1 is not fixed to the field edge 20 as shown in FIG. 6A, the hat material 3 When the pressing force P is larger than the shared load W of the weight, the ceiling vibration isolator 10 is slightly lifted upward, and a slight gap G2 may be formed between the locking piece 1 and the field edge 20. Here, since the thickness t1 of the hat material 3 is in the range of 3.2 mm to 4.5 mm, and the hat material 3 is a steel member having a thickness t1 in this range and has an appropriate weight, the hat material 3 The anti-vibration material 5 is compressed in step 3, and a compressed state can be formed in a compression ratio of 10% to 20%.

On the other hand, when the ceiling vibration isolator 10 is pressed upward by the pressing force P from below, if the pressing force P is smaller than the shared load W of the weight of the hat material 3, the weight of the hat material 3 The locking piece 1 does not rise from the field edge 20. In such a case, if the locking piece 1 is simply locked to the field edge 20, the vibration is propagated to the ceiling surface material 40 through the floor material 30 on the upper floor, and the ceiling surface material 40 is excited. When this is done, there is a concern that a rattling noise may be generated between the locking piece 1 and the field edge 20. Therefore, as shown in FIG. 6B, by fixing the locking piece 1 and the field edge 20 with a fixing means 60 such as a screw, this rattling noise can be suppressed.

According to the ceiling anti-vibration structure 50, the anti-vibration material 5 is in contact with the ceiling surface material 40 in a compressed state in the range of 10% to 20%, which is caused by the floor impact noise on the upper floor. When the ceiling surface material 40 vibrates, the compressed vibration isolator 5 elastically deforms while following the vibration of the ceiling surface material 40, resulting in floor impact sound in a wide frequency band (heavy floor impact sound to light weight). The vibration of the ceiling surface material 40 due to the floor impact sound up to the floor impact sound) can be effectively suppressed. Here, the vibration isolator 5 is compressed in a compression ratio of 10% to 20%, and by tuning the vibration isolator 5 to around 63 Hz, which is the frequency band of heavy floor impact sound, the frequency and vibration of the sound. Based on the general relationship between transmission rates, light-weight floor impact sounds in the frequency band of, for example, about 256 Hz to 500 Hz can also be vibration-proofed.

[Experiment 1 to verify the vibration acceleration reduction level]
The present inventors have produced the ceiling vibration isolator shown in FIG. 1 having a plurality of types of anti-vibration materials, and produced the ceiling anti-vibration structure shown in FIG. 5 including each ceiling anti-vibration material to provide each ceiling vibration isolation material. An experiment was conducted to verify the vibration acceleration reduction level in the structure. Here, a plurality of types of ceiling vibration isolation structures are formed by changing the compressibility of the vibration isolator between 10% and 20% and changing the hardness of the vibration isolator at 1, 5, and 20 degrees. did. Table 1 below shows the dimensions, compressibility, hardness, and vibration acceleration reduction level of the vibration-proof material that forms each ceiling vibration-proof structure. The vibration acceleration reduction level in Table 1 indicates the acceleration level to be reduced with respect to the vibration acceleration in the reference benchmark, and therefore, the numerical values are expressed in minus.

From Table 1, when the compressibility of the anti-vibration material is 10% or 20% (compression rate is in the range of 10% to 20%), and when the hardness of the anti-vibration material is in the range of 1 to 20 degrees. It has been demonstrated that the vibration acceleration reduction level is an extremely high reduction level of 20 dB or more with respect to the reference vibration acceleration level. From this result, it can be defined that a ceiling vibration isolator structure in which the vibration isolator having a hardness in the range of 1 degree to 20 degrees is compressed in the compression ratio range of 10% to 20% is a desirable structure.

[Experiment 2 to verify the vibration acceleration reduction level]
Furthermore, the present inventors have conducted experiments to verify the vibration acceleration reduction level in each ceiling vibration isolation structure by prototyping a plurality of types of ceiling vibration isolation structures by changing the thickness of the hat material. Here, the thickness of the hat material was set to three types of 4.5 mm, 3.2 mm, and 2.3 mm. Table 2 below shows the dimensions, compression ratio, hardness, thickness of the hat material, and vibration acceleration reduction level of the vibration-proof material forming each ceiling vibration-proof structure.

From Table 2, in Example 9 in which the thickness of the hat material is 2.3 mm, the vibration acceleration reduction level is 19.9 dB, which is close to 20 dB with respect to the reference vibration acceleration level, and the thickness of the hat material is 4. In Examples 7 and 8 of 5 mm and 3.2 mm, the vibration acceleration reduction level was 20 dB or more, which was an extremely high reduction level with respect to the reference vibration acceleration level. From this result, it can be defined that the thickness of the hat material is preferably in the range of 2.3 mm to 4.5 mm and is preferably in the range of 3.2 mm to 4.5 mm.

Other embodiments may be obtained in which other components are combined with respect to the configurations listed in the above embodiments, and the present invention is not limited to the configurations shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

1: Locking piece 2: Bottom piece, 2a: Bottom surface 3: Hat material, 5: Anti-vibration material, 10: Ceiling anti-vibration material, 20: Ceiling base material (field edge), 25: Field edge receiver, 30: Floor material (ALC version), 40: Ceiling surface material (gypsum board), 50: Ceiling anti-vibration structure, 60: Fixing means

Claims (5)

In the ceiling base material that supports the ceiling surface material, it is a ceiling vibration isolator that is bridged over the ceiling base material that faces the ceiling.
A front-view hat-shaped hat material in which the left and right L-shaped locking pieces locked to the ceiling base material and the bottom piece connecting the left and right locking pieces are integrated.
It is characterized by having a vibration-proof material which is attached to two places on the left and right of the bottom surface of the bottom piece and is brought into contact with the ceiling surface material in a state of being compressed in a compression ratio of 10% to 20%. , Ceiling anti-vibration material. The ceiling vibration isolator according to claim 1, wherein the hardness of the anti-vibration material is in the range of 1 degree to 20 degrees. The ceiling vibration isolator according to claim 1 or 2, wherein the hat material is a steel hat material, and the thickness of the hat material is in the range of 3.2 mm to 4.5 mm. It has a ceiling surface material, a ceiling base material that supports the ceiling surface material, and a ceiling vibration isolator according to any one of claims 1 to 3 that spans the ceiling base material that faces the ceiling surface material.
A ceiling anti-vibration structure, characterized in that the anti-vibration material is in contact with the ceiling surface material in a state of being compressed to a compression ratio of 10% to 20%. The ceiling vibration isolation structure according to claim 4, wherein the hat material is fixed to the ceiling base material.

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