JP2024043762A - Vibration isolation material and vibration isolation floor structure - Google Patents

Abstract

To provide a vibration isolation material and a vibration isolation floor structure that can reduce an amount of material used for the vibration isolation material, reduce burden during manufacturing, and improve sound insulation performance.SOLUTION: A vibration isolation material 40 is a linear vibration isolation material 40, which is placed between a floor plate 60 on the upper floor of a building and a beam 10 supporting the floor plate 60, having a base portion 41 with a flat cross-sectional shape orthogonal to the longitudinal direction and one convex portion 42 protruding upward from the upper surface 41a of the base portion 41 and narrower than the width of the base portion 41.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vibration isolating material and a vibration isolating floor structure.

Floor impact noise on the upper floors of a building is transmitted through the upper floors to the ceiling of the lower floor below, where it is excited and radiated to the floor below. This floor impact noise includes heavy floor impact noise and light floor impact noise.

Conventional vibration-proof floor structures are formed, for example, by attaching a strip-shaped vibration-proof material to the upper surface of a steel beam (H-shaped steel, channel steel, etc.) and placing floor panels that form the floor of the upper floor on top of the vibration-proof material (see, for example, Patent Documents 1 and 2). This floor panel is a dry floor panel (dry floor), and one example is an ALC (autoclaved light weight concrete) floor panel (ALC panel). For example, when the floor receives a heavy floor impact sound, the elasticity of the vibration-proof material on the steel beam reduces the frequency of the heavy floor impact sound, thereby demonstrating sound insulation performance.

The upper surface of the vibration-proof material described in Patent Documents 1 and 2 has an uneven shape. This uneven shape has multiple protrusions in the width direction that intersects with the longitudinal direction of the beam.

The smaller the spring constant of the vibration-proofing material (the softer the material is), the greater the effect of reducing the frequency of floor impact noise. However, a small spring constant also reduces the load-bearing capacity of the vibration-proofing material, making it difficult to support relatively heavy floorboards. In addition, a small spring constant also makes it easier for creep to progress in the vibration-proofing material, making it difficult to achieve stable sound insulation performance over time.

JP 2001-182207 A Japanese Patent Application Publication No. 2005-16103

In the floor structures described in Patent Documents 1 and 2, the greater the surface pressure of the vibration-proof material that supports the floorboards, the smaller the spring constant can be, so even when the floorboards are supported linearly, they are supported by the upper surface of the convex portion, which has a small contact area. However, in conventional structures in which multiple convex portions are formed in the width direction, the amount of material required to manufacture the vibration-proof material increases, and the burden of forming the uneven shape during manufacturing becomes an issue.

The present invention was made in consideration of the above problems, and aims to provide a vibration-proof material and vibration-proof floor structure that can reduce the amount of material used for the vibration-proof material, reduce the burden during manufacturing, and improve sound insulation performance.

In order to achieve the above object, one aspect of the vibration isolating material according to the present invention is as follows:
A linear vibration-proofing material arranged between a floorboard on the upper floor of a building and a beam supporting the floorboard,
a base portion with a flat cross-sectional shape perpendicular to the longitudinal direction;
It is characterized by having one convex part that protrudes upward from the upper surface of the base part and has a width narrower than the width of the base part.

According to this aspect, since only one convex portion protruding upward from the base portion is provided, a simple structure can be achieved compared to a configuration having multiple convex portions. This allows the material of the vibration-proof material to be reduced and the burden during manufacturing to be reduced. In addition, the width of the convex portion is narrower than the width of the base portion, and by receiving the floor board with such a convex portion, the surface pressure on the upper surface of the convex portion can be increased. This allows the sound insulation performance to be improved. In addition, since the lower surface of the base portion, which is wider than the convex portion, can be used as the installation surface and placed on the beam, the vibration-proof material can be prevented from shifting in position relative to the beam. By preventing the vibration-proof material from shifting in position, the floor board placed on the vibration-proof material can be prevented from shifting in position. Therefore, it is not necessary to adjust the placement of the floor board again after placing the floor board once. In this aspect, since the width of the convex portion is narrower than the width of the base portion, it is easy to identify the position in the width direction when placing the floor board at the construction site. This allows the floor board to be placed with high precision relative to the vibration-proof material. In addition, in this embodiment, even if the protruding portion becomes worn due to long-term use, the base portion can still support the floorboard.

Moreover, in another aspect of the present invention,
The convex portion is provided at a width center position of the base portion.

According to this embodiment, the distance between the fulcrums of the vibration-proofing material in the longitudinal direction of the floorboard can be increased compared to conventional structures in which the entire top surface of the vibration-proofing material is supported on both ends or on the entire width of the floorboard. This allows the natural frequency (resonance frequency) of the floorboard to be reduced, improving sound insulation performance. By increasing the distance between the fulcrums of the vibration-proofing material, the floorboard can be made to flex more easily, improving sound insulation performance.

Moreover, in another aspect of the present invention,
The convex portion is provided at a position offset to one side in the width direction of the base portion.

According to this embodiment, the distance between the fulcrums of the vibration-proofing material in the longitudinal direction of the floorboard can be increased further in the width direction compared to conventional structures in which the entire top surface of the vibration-proofing material is supported on both ends. This makes it possible to reduce the natural frequency (resonance frequency) of the floorboard and improve sound insulation performance.

In another aspect of the present invention,
The protrusion is characterized in that it is provided on the inside of an end in the width direction of the base portion.

The "inner side" here refers to the inner side in the width direction of the vibration isolating material, which is closer to the center position in the width direction. In other words, in a beam of H-shaped steel, the side closer to the web is the outside, and the side closer to the widthwise end of the beam is the inside. According to this aspect, compared to a structure in which the ends of the base part and the convex part overlap in the width direction of the vibration isolator, the convex part is arranged inside the outer end of the base part. Therefore, the possibility that the end of the floorboard will be arranged so as to overlap the upper surface of the convex portion is reduced. Since the edge of the floorboard is placed outside the top surface of the convex part of the vibration isolator, the entire top surface of the convex part can receive the floorboard, and the surface pressure on the convex part of the vibration isolator can be maintained appropriately. can do.

In another aspect of the present invention,
The protrusion and the base are integrally formed from a foamed rubber material.

According to this embodiment, by using a foamed rubber material containing many air bubbles, the apparent hardness of the rubber can be reduced while maintaining strength by using a viscoelastic material to which sufficient reinforcing material has been added, and a vibration-proof material that can reduce floor impact noise can be provided.

Further, one aspect of the vibration-proof floor structure according to the present invention is as follows:
A vibration-proof floor structure comprising a floor plate on an upper floor of a building and a beam supporting the floor plate,
The vibration isolating material described above is disposed on the beam, and the floorboard is supported by the convex portion.

According to this aspect, since only one convex portion protruding upward from the base portion is provided, a simple structure can be achieved compared to a configuration having multiple convex portions. This allows the material of the vibration-proof material to be reduced and the burden during manufacturing to be reduced. In addition, the width of the convex portion is narrower than the width of the base portion, and by receiving the floor board with such a convex portion, the surface pressure on the upper surface of the convex portion can be increased. This allows the sound insulation performance to be improved. In addition, since the lower surface of the base portion, which is wider than the convex portion, can be used as the installation surface and placed on the beam, the vibration-proof material can be prevented from shifting in position relative to the beam. By preventing the vibration-proof material from shifting in position, the floor board placed on the vibration-proof material can be prevented from shifting in position. Therefore, it is not necessary to adjust the placement of the floor board again after placing the floor board once. In this aspect, since the width of the convex portion is narrower than the width of the base portion, it is easy to identify the position in the width direction when placing the floor board at the construction site. This allows the floor board to be placed with high precision relative to the vibration-proof material. In addition, in this embodiment, even if the protruding portion becomes worn due to long-term use, the base portion can still support the floorboard.

In another aspect of the present invention,
In the width direction, an end of the protruding portion closer to the center of the beam is disposed so as to overlap an end of the base portion closer to the center of the beam.

According to this aspect, the distance between the fulcrums of the vibration isolators in the longitudinal direction of the floorboard can be further increased compared to the conventional structure in which the vibration isolators are supported on the entire upper surface or both ends of the upper surface in the width direction. Thereby, the natural frequency (resonance frequency) of the floorboard can be reduced, and the sound insulation performance can be improved. Furthermore, since the ends of the base portion and the end portions of the convex portion are aligned, manufacturing is easier compared to a configuration in which the end portions of the base portion and the end portions of the convex portion are not aligned. In addition, if the end of the base and the end of the protrusion are aligned, the position of the end of the protrusion can be easily identified in the width direction, so the position when placing the floorboard can be easily determined. easy to identify. Therefore, the floorboards can be placed with high precision.

Moreover, in another aspect of the present invention,
The above-mentioned vibration isolating material is arranged on the beam,
The end of the convex portion closer to the center of the beam is arranged to be shifted away from the center of the beam from the end of the base portion closer to the center of the beam.

In this embodiment, compared to a structure in which the ends of the base and convex portions overlap in the width direction of the vibration-proofing material, the convex portion is positioned more inward than the outer end of the base portion. This reduces the risk that the end of the floorboard will be positioned to overlap the upper surface of the convex portion. Because the end of the floorboard is positioned more outward than the upper surface of the convex portion of the vibration-proofing material, the floorboard can be supported by the entire upper surface of the convex portion, and the surface pressure at the convex portion of the vibration-proofing material can be appropriately maintained.

As can be understood from the above description, according to the present invention, it is possible to reduce the amount of materials used for vibration isolating materials, reduce the burden during manufacturing, and improve sound insulation performance. Anti-vibration materials and anti-vibration floor structures can be provided.

FIG. 2 is an exploded perspective view of a portion of an example of a floor structure of a building according to the first embodiment. FIG. 1 is a longitudinal cross-sectional view of an example of a floor structure of a building according to a first embodiment. 1 is a longitudinal cross-sectional view of a vibration-proof material according to a first embodiment. FIG. FIG. 2 is a plan view of the vibration isolating material according to the first embodiment. FIG. 2 is a vertical cross-sectional view of an example of the floor structure of the building according to the first embodiment, and is a vertical cross-sectional view showing vibration-proofing materials on beams arranged apart in the longitudinal direction of the floorboards. FIG. 11 is a vertical cross-sectional view of an example of a floor structure of a building according to a second embodiment. FIG. 6 is a longitudinal cross-sectional view showing a vibration-proof material according to a second embodiment. FIG. 7 is a longitudinal cross-sectional view showing a vibration isolator according to a third embodiment.

Hereinafter, vibration-proof floor structures according to each embodiment will be described with reference to the attached drawings. Note that in this specification and the drawings, substantially the same constituent elements may be given the same reference numerals to omit redundant explanation.

[Floor structure of building according to first embodiment]
First, an example of the floor structure of a building according to the first embodiment will be described with reference to FIGS. 1 to 5. Here, FIG. 1 is a partially exploded perspective view of an example of the floor structure of a building according to the first embodiment. FIG. 2 is a longitudinal sectional view of an example of the floor structure of a building according to the first embodiment. FIG. 3 is a longitudinal cross-sectional view of the vibration isolating material according to the first embodiment. FIG. 4 is a plan view of the vibration isolating material according to the first embodiment. FIG. 5 is a longitudinal cross-sectional view of an example of the floor structure of a building according to the first embodiment, and is a vertical cross-sectional view showing vibration-proofing materials on beams arranged apart in the longitudinal direction of the floorboard. FIG. 1 shows the vibration isolating material 40 and the floor plate 60 on one side of the beam 10, and omits the illustration of the other vibration isolating material 40 and the floor plate 60. Furthermore, various mat materials constituting the floor 50 are shown in FIG. It is omitted. Moreover, in FIGS. 3 and 4, the beam 10 and the floorboard 60 are shown with imaginary lines. Further, in each figure, arrows indicating the X-axis direction, Y-axis direction, and Z-axis direction are appropriately illustrated as three directions orthogonal to each other. The Y-axis direction is along the longitudinal direction of the beam 10. The X-axis direction is along the width direction that intersects the longitudinal direction of the beam 10. The Z-axis direction is along the vertical direction.

The illustrated floor structure (vibration-proof floor structure) 100 of a building includes a floor 50 on an upper floor (for example, the second or third floor) of the building, and a beam 10 that supports the floor 50. The illustrated beam 10 is formed of an H-section steel having a web 11, an upper flange 12, and a lower flange 13.

An anti-vibration material 40 is disposed on the upper surface 12a of the upper flange 12 of the beam 10. The anti-vibration material 40 is strip-shaped and is disposed continuously along the longitudinal direction of the beam 10. The longitudinal direction of the anti-vibration material 40 is aligned with the longitudinal direction of the beam 10. The anti-vibration material 40 is a linear anti-vibration material disposed between the floorboards 60 of the upper floor and the beams 10 that support the floorboards 60.

3, the vibration-proof material 40 has a base portion 41 and a protruding portion 42. The cross-sectional shape of the base portion 41 perpendicular to the longitudinal direction is flat. The cross-sectional shape of the base portion 41 may be rectangular. The width of the base portion 41 along the X-axis direction is greater than the thickness along the Z-axis direction. The base portion 41 includes an upper surface 41a and a lower surface 41b. The lower surface 41b is the surface closer to the upper flange 12 of the beam 10, and the upper surface 41a is the surface closer to the floor plate 60. The width W41 of the base portion 41 may be, for example, 40 mm. The thickness T41 of the base portion 41 may be, for example, 4 mm. The thickness T41 is the length from the upper surface 41a to the lower surface 41b.

The protrusion 42 protrudes upward from the upper surface 41a of the base portion 41. The cross-sectional area of the protrusion 42 is smaller than the cross-sectional area of the base portion 41. The protrusion 42 has an upper surface 42a. The upper surface 42a of the protrusion 42 is located above the upper surface 41a of the base portion 41.

The convex portion 42 is provided at the center position (width center position) of the base portion 41 in the width direction. The width W42 of the convex portion 42 may be, for example, 10 mm. The thickness T42 of the convex portion 42 may be, for example, 4 mm. The thickness T40 of the vibration isolator 40 may be 8 mm. The thickness T42 is the length from the upper surface 41a of the base portion 41 to the upper surface 42a of the convex portion 42. The thickness T40 is the length from the lower surface 41b of the base portion 41 to the upper surface 42a of the convex portion 42.

As shown in Figures 1 and 2, the upper flange 12 of the beam 10 has ends 12c and 12d extending in the longitudinal direction. End 12c is the end on one side in the width direction of the beam 10, and end 12d is the end on the other side. As shown in Figures 3 and 4, the base portion 41 has ends 41c and 41d extending in the longitudinal direction. Ends 41c and 41d are spaced apart in the width direction. The protruding portion 42 has ends 42c and 42d extending in the longitudinal direction. Ends 42c and 42d are spaced apart in the width direction.

An end 41c of the base portion 41 is located close to the ends 12c and 12d of the upper flange 12, and an end 41d of the base portion 41 is located close to the web 11 of the beam 10. An end 42c of the convex portion 42 is disposed close to the end 41c of the base portion 41, and an end 42d of the convex portion 42 is disposed close to the end 41d of the base portion 41.

As shown in FIG. 1, multiple floor panels 60 are arranged in the longitudinal direction of the beam 10. The longitudinal direction of the floor panels 60 is a direction that intersects with the longitudinal direction of the beam 10. As shown in FIG. 2 and FIG. 5, the longitudinal end 60a of the floor panels 60 is supported by the vibration-proof material 40. The longitudinal end 60a of the floor panels 60 is supported by the beam 10 via the vibration-proof material 40. The vibration-proof material 40 is sandwiched between the floor panels 60 and the upper flange 12 in the vertical direction.

The end surface 60b of the floor plate 60 is a surface that intersects with the longitudinal direction of the floor plate 60 and is along the Y-Z plane. The end surface 60b of the floor plate 60 is included in the end portion 60a that is along the longitudinal direction of the beam 10.

As shown in FIG. 2, in the width direction of the beam 10, a gap is formed between the floor plate 60 arranged on one side and the floor plate 60 arranged on the other side. Similarly, in the width direction of the beam 10, a gap is formed between the vibration-proof material 40 arranged on one side and the vibration-proof material 40 arranged on the other side.

In the width direction of the beam 10, the gap between the protruding portions 42 of the vibration-proof material 40 is wider than the gap between the end faces 60b of the floor plate 60. The floor plate 60 is placed on the upper surface 42a of the protruding portion 42.

For the vibration isolating material 40, for example, in addition to rubber, a viscoelastic material such as a rubber-like elastomer or resin is used. Examples of constituent materials include ethylene-propylene-diene copolymer rubber (EPDM), acrylonitrile butadiene rubber (NBR), and urethane (polyurethane), but are not limited to natural rubber (NR) and chloroprene rubber. (CR), butyl rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR), recycled rubber, polyisobutylene, partially crosslinked butyl rubber, and thermoplastic elastomers such as olefin thermoplastic elastomers and styrene thermoplastic elastomers. At least one selected polymer component can be exemplified. Also, these foams (sponges) can be used. These foams are an example of foamed rubber materials.

It is believed that reducing floor impact noise is more effective when the hardness of the vibration-proofing material 40 is low. However, if one were to try to achieve this with a solid material without air bubbles, the Type A durometer (based on JIS K6253) measurement would be predicted to be around 30, and since sufficient strength is required to support the floor, it would be extremely difficult to maintain a hardness of around 30 while adding sufficient reinforcing material to obtain that strength. Therefore, by adopting a foam (sponge) containing many air bubbles, it is possible to provide an ideal vibration-proofing material 40 that can reduce floor impact noise by lowering the apparent rubber hardness while maintaining strength through the use of a viscoelastic material to which sufficient reinforcing material has been added.

In addition, the vibration-proof material 40 can be manufactured integrally with the protrusion 42 and base 41 from foamed rubber material, for example, by extrusion molding.

The floor 50 has a number of dry floor panels 60 and a floor mat 70 laid on top of the multiple floor panels 60 laid horizontally. The floor panels 60 may be the ALC floor panels described above or precast concrete floor panels (PCa floor panels, PCa panels), etc.

The illustrated floor mat 70 is formed by laminating double soundproof mats 71 and 72, a particle board 73, and a floor mat 74.

Next, a method for constructing the floor structure 100 of a building will be described. First, the columns and beams 10, which are the structural body of the building, are constructed on-site. Vibration-proof materials 40 are placed on the upper surface 12a of the upper flange 12 of the beam 10. For example, the vibration-proof materials 40 can be attached to the upper flange 12 using double-sided tape. The vibration-proof materials 40 are arranged alternately and continuously along the longitudinal direction of the beam 10.

Note that the vibration isolating material 40 may be bonded to the beam 10 using an adhesive, for example, or may be attached to the beam 10 by other methods. The vibration isolating material 40 may simply be placed on the upper surface 12a of the upper flange 12.

After attaching the vibration isolating material 40 to the beam 10, a plurality of floorboards 60 are arranged. A plurality of floorboards 60 are placed on the vibration isolator 40. An end 60a of the floorboard 60 is supported by the vibration isolator 40. The lower surface of the end portion 60a of the floorboard 60 contacts the upper surface 42a of the convex portion 42 of the vibration isolator 40. Note that another object may be interposed between the upper surface 42a of the convex portion 42 of the vibration isolating material 40 and the lower surface of the floorboard 60.

When placing the floorboard 60, the convex portion 42 of the vibration-proof material 40 on the beam 10 can be used as a marker to position the floorboard 60 relative to the convex portion 42. Since the vibration-proof material 40 has only one convex portion 42 in the width direction, the convex portion 42 is easy to see. For example, the floorboard 60 can be positioned so that the edge of the convex portion 42 and the edge of the floorboard 60 are parallel.

Next, the floorboard 60 is fixed to the beam 10. The floorboard 60 is fixed to the beam 10 using, for example, fixtures, bolts, nuts, and the like. Other methods may be used for fixing the floorboard 60 to the beam 10. After the floorboard 60 is fixed, a floor mat 70 is laid on the floorboard 60.

In addition, in the construction method for the floor structure 100 of a building, the order of construction can be changed as appropriate. For example, the vibration-proof material 40 may be attached to the beams 10 in advance at a factory. The beams 10 with the vibration-proof material 40 attached thereto may be transported to the site, and then the beams 10 may be constructed on site.

According to the vibration isolating material 40 according to the present embodiment, only one convex portion 42 protruding upward from the base portion 41 is provided in the width direction, compared to a structure having a plurality of convex portions 42. , it can have a simple structure. Thereby, it is possible to reduce the amount of material used for the vibration isolating material 40, and the burden during manufacturing can be reduced. Further, the width W42 of the convex portion 42 is narrower than the width W42 of the base portion 41, and by receiving the floorboard 60 with such a convex portion 42, the surface pressure on the upper surface 42a of the convex portion 42 can be increased. Thereby, it is possible to improve sound insulation performance.

Further, since the lower surface 41b of the base portion 41, which is wider than the convex portion 42, can be placed on the upper flange 12 of the beam 10 as the installation surface, it is possible to prevent the vibration isolator 40 from shifting with respect to the beam 10. . By preventing the vibration isolating material 40 from shifting, the floorboard 60 placed on the vibration isolating material 40 can be prevented from shifting. Therefore, after the floorboard 60 is placed once, there is no need to adjust the arrangement of the floorboard 60 again.

Moreover, in the vibration isolating material 40, since the width W42 of the convex portion 42 is narrower than the width W41 of the base portion 41, it is easy to specify the position in the width direction when placing the floorboard 60 at the construction site. Thereby, the floorboard 60 can be accurately placed with respect to the vibration isolating material 40. Further, in this aspect, even when the convex portion 42 becomes sagging due to long-term use, the floorboard 60 can be supported by the base portion 41.

[Second embodiment]
Next, a floor structure 100B including a vibration isolating material 40B according to a second embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a longitudinal sectional view of an example of the floor structure of a building according to the second embodiment. FIG. 7 is a longitudinal cross-sectional view showing a vibration isolating material according to a second embodiment.

The vibration-proof material 40B according to the second embodiment shown in Figures 6 and 7 differs from the vibration-proof material 40 according to the first embodiment in that the arrangement of the convex portions 42B is different. In the description of the second embodiment, descriptions similar to those of the first embodiment above will be omitted.

As shown in FIG. 6, the building floor structure 100B according to the second embodiment includes vibration-proof material 40B. The vibration-proof material 40B has a base portion 41 and a protruding portion 42B. The protruding portion 42B is provided at a position offset to one side in the width direction of the base portion 41. The protruding portion 42B is disposed at a position that is offset from the center position in the width direction of the base portion 41. When placed on the upper flange 12 of the beam 10, the protruding portion 42B is disposed at a position closer to the web 11 in the width direction of the beam 10 than the end 12c.

In plan view, the end 42d of the convex portion 42B is arranged to overlap the end 41d of the base portion 41.

The floor structure 100B including the vibration-proof material 40B according to the second embodiment has the same effect as the floor structure 100 according to the first embodiment. In the floor structure 100B according to the second embodiment, the convex portion 42B is disposed closer to the web 11, which is the center of the beam 10, than the center of the base portion 41 in the width direction of the beam 10. According to the floor structure 100B, the distance between the fulcrums of the vibration-proof material 40B in the longitudinal direction of the floor board 60 can be further increased compared to the conventional structure in which the vibration-proof material is supported on the entire surface or both ends of the upper surface in the width direction of the beam 10. This makes it possible to reduce the natural frequency (resonance frequency) of the floor board 60 and improve the sound insulation performance. The distance between the fulcrums of the vibration-proof material 40B is the distance between the convex portions 42B in the X-axis direction.

In addition, in the floor structure 100B according to the second embodiment, in the width direction of the beam 10, the end 42d of the convex portion 42B closer to the web 11, which is the center position of the beam 10, is closer to the web 11 of the base portion 41. It is arranged so as to overlap the end 41d of. In the floor structure 100B having such a configuration, the end 41d of the base portion 41 and the end 42d of the convex portion 42B are aligned, so compared to a structure in which the end of the base portion and the end of the convex portion are not aligned. Therefore, it is easy to manufacture. Furthermore, when the end 41d of the base portion 41 and the end 42d of the convex portion 42B are aligned, the position of the end 42d of the convex portion 42B can be easily identified in the width direction of the beam 10. This makes it easy to specify the position when placing the floorboard 60. Therefore, the floorboard 60 can be arranged with high precision.

[Third embodiment]
Next, a floor structure including a vibration isolating material 40C according to a third embodiment will be described with reference to FIG. FIG. 8 is a longitudinal sectional view showing a vibration isolating material according to a third embodiment. A vibration isolating material 40C according to the third embodiment shown in FIG. 8 differs from a vibration isolating material 40B according to the second embodiment in that the arrangement of convex portions 42C is different. In the description of the third embodiment, descriptions similar to those of the first and second embodiments above will be omitted. The floor structure 100 may include a vibration isolator 40C instead of the vibration isolators 40 and 40B.

The vibration isolator 40C has a base portion 41 and a convex portion 42C. The convex portion 42C is provided at a position offset to one side in the width direction of the base portion 41. When placed on the upper flange 12 of the beam 10, the convex portion 42C is located closer to the web 11 than the end 12c in the width direction of the beam 10.

In plan view, the end 42d of the convex portion 42C is provided inside the end 41d of the base portion 41. The "inside" here refers to the inner side in the width direction of the vibration isolating material 40C, which is closer to the center position in the width direction.

The floor structure including the vibration-proof material 40C according to the third embodiment has the same effect as the floor structures 100 and 100B according to the first and second embodiments. Compared to a structure in which the ends 41d and 42d of the base portion 41 and the protruding portion 42 overlap in the width direction of the vibration-proof material 40C, the protruding portion 42C is arranged inside the outer end 41d of the base portion 41. Therefore, the risk that the end surface 60b of the floor plate 60 is arranged to overlap the upper surface 42a of the protruding portion 42C is reduced. Since the end surface 60b of the floor plate 60 is arranged outside the upper surface 42a of the protruding portion 42 of the vibration-proof material 40C, the floor plate 60 can be received by the entire upper surface 42a of the protruding portion 42C, and the surface pressure at the protruding portion 42C of the vibration-proof material 40C can be appropriately maintained.

Note that the configurations described in the above embodiments may be combined with other components, and the present invention is not limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately according to the application form.

[Modification]
In the above embodiment, the vibration-proof material 40 and the floor plate 60 are arranged so as to be in contact with each other, but the floor plate 60 may be supported by the vibration-proof material 40 via, for example, a support metal. In addition, the vibration-proof material 40 is not limited to being arranged on the upper surface 12a of the upper flange 12 of the beam 10, and may be arranged on a support metal attached to the beam 10.

In addition, in the above embodiment, an H-shaped steel is used as the beam 10, but the beam 10 is not limited to an H-shaped steel. For example, the beam 10 may be a square steel pipe or a piece of wood with a rectangular cross section.

10: Beam (H-shaped steel)
11: Web 12: Upper flange 12a: Upper surface 12c: End 12d: End 13: Lower flange 40, 40B, 40C: Vibration isolating material 41: Base portion 41a: Upper surface 41b: Lower surface 41c: End 41d: End 42, 42B, 42C : Convex part 42c: Edge 42d: Edge 50: Floor 60: Floor board 60a: Edge 60b: End surface 60c: Edge 70: Floor mat 71, 72: Soundproof mat 73: Particle board 74: Floor mat 100, 100B: Floor structure (proof shaking bed structure)
T40: Thickness of vibration isolating material T41: Thickness of base portion T42: Thickness of convex portion W41: Width of base portion W42: Width of convex portion X: X-axis direction (width direction of vibration isolating material)
Y: Y-axis direction (longitudinal direction of vibration isolating material)
Z: Z-axis direction

Claims (8)

A linear vibration-proof material disposed between a floor plate of an upper floor of a building and a beam supporting the floor plate,
A base portion having a flat cross-sectional shape perpendicular to the longitudinal direction;
A vibration-proof material comprising: a protrusion protruding upward from an upper surface of the base portion and having a width narrower than a width of the base portion. The vibration isolating material according to claim 1, wherein the convex portion is provided at a width center position of the base portion. The vibration isolating material according to claim 1, wherein the convex portion is provided at a position offset to one side in the width direction of the base portion. The vibration-proofing material according to claim 3, characterized in that the protrusion is provided inside the widthwise end of the base portion. The vibration-proof material according to claim 1, characterized in that the protrusion and the base are integrally formed from a foamed rubber material. A vibration-proof floor structure comprising a floor plate on an upper floor of a building and a beam supporting the floor plate,
A vibration-isolating floor structure, characterized in that the vibration-isolating material according to any one of claims 1 to 5 is arranged on the beam, and the floor plate is supported by the convex portion. 7. An end of the convex portion closer to the center of the beam is arranged so as to overlap an end of the base portion closer to the center of the beam in the width direction. Anti-vibration floor structure. The vibration isolating material according to claim 3 is disposed on the beam,
An end of the convex portion closer to the center of the beam is disposed offset from an end of the base portion closer to the center of the beam in a direction away from the center of the beam. The vibration-proof floor structure according to item 6.

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