JP5383440B2 - Soundproof foot member for double floor and double floor - Google Patents

Description

  The present invention relates to a soundproof foot member for a double floor that supports an upper floor in a double floor in which an upper floor is constructed on a lower floor such as a concrete slab such as a reinforced concrete structure.

  FIG. 9 shows a double floor equipped with a conventional soundproof foot member. Conventionally, a double floor is known in which a plurality of receiving plates 6 (bundle plates or joists) are arranged side by side on a lower floor 7 such as a concrete slab, and an upper floor 8 is pasted thereon. The upper floor 8 is usually composed of a lower pasting material 8a such as particle board and a finishing material 8b such as flooring. The receiving plate 6 includes a square-shaped bundle plate, an elongated plate-like joist, and the like, and the foot member protruding downward is attached to the central portion in the case of the bundle plate and at least two locations near both ends in the case of the joist. . The foot member is a support bolt 5 having a cushion material 3 attached to the lower end thereof, and is screwed to a receiving nut 61 attached to a wooden receiving plate 6. A groove is formed on the upper end surface of the support bolt 5, and the height can be adjusted by rotating it from above with a screwdriver. The cushion material 3 is a rubber lump, and is attached to the support bolt 5 by fitting the lower end portion of the support bolt 5 to a mounting portion recessed on the upper surface. Such a soundproof foot member reduces the transmission (sound) of the upper floor to the lower floor.

  Further, Patent Document 1 below discloses a soundproof foot member having improved soundproof performance as compared with the conventional soundproof foot member. This is made up of an upper member, a lower member made of an elastic material such as rubber having a recess having a diameter larger than that of the upper member on the upper surface, and a generally cylindrical shape to be externally fitted to the lower member. An outer fitting member having a supporting film provided in the horizontal direction with the outer peripheral portion attached thereto. The support film comes into contact with the upper surface of the lower member while the outer fitting member is fitted on the lower member, and the upper member is supported on the support film and on the recess. The sound of the upper floor is transmitted to the lower floor via the upper member, the support film, and the lower member, but since the upper member is supported on the support film just like riding on a hammock, the vibration of the upper member is supported by the support film. It is absorbed by the vibrations and is difficult to transmit to the lower member.

JP 2003-328539 A

Sounds transmitted from the upper floor to the lower floor include light impact sounds and heavy impact sounds. Light impact sounds are mainly based on normal life sounds, and heavy impact sounds are caused by special actions such as the sound of a child running around and the sound generated when an object is dropped.
The sound insulation performance of the double floor itself is based on the fact that the floor is constructed on the upper floor against the volume measured on the lower floor by generating noise directly on the upper floor concrete floor (lower floor) with a tamping machine etc. Evaluate how much the sound volume measured on the lower floor is reduced by generating noise, and it is expressed as a “floor impact noise reduction performance grade” based on a certain standard. The light impact sound is represented by “ΔLL value”, and the heavy impact sound is represented by “ΔLH value”.

The conventional soundproof foot members described above are excellent in the performance of reducing lightweight impact sound, but the weight impact sound is hardly reduced.
Among the heavy impact sounds, in particular, noise in the 63 Hz band feels most uncomfortable for residents. However, when a double floor is constructed, generally the noise in the 63 Hz band increases compared to the case of a concrete floor directly. The sound insulation performance has been improved by appropriately selecting the thickness, shape (contact area, etc.) or hardness of the cushioning material, but no matter how much such parameters are devised by trial and error, the weight impact in the 63 Hz band is improved. It was difficult to reduce the sound.

  This invention makes it a subject to reduce the noise of the 63 Hz band which a resident feels most unpleasant than the conventional double floor.

[Claim 1]
The present invention provides a double-floor soundproof foot member having a support bolt for supporting the upper floor of the double floor and a soundproofing device mounted on the lower floor and installed on the lower floor.
Having a flange at the lower end of the support bolt;
The soundproofing device is a cylindrical pedestal having a through hole, a cushion material and a pressure nut are sequentially stacked from below, and the support bolt is inserted into the through hole.
The upper surface of the flange portion of the support bolt abuts around the through hole on the lower surface of the pedestal portion, and the cushion material is forcibly compressed between the pedestal portion and the pressure nut by tightening the pressure nut.
A double-floor soundproof foot member, characterized in that an annular protrusion is formed on the lower surface of the pedestal portion, so that the support bolt can be displaced downward when a load is applied from above. is there.

[Claim 2]
In addition, the present invention provides a double-floor soundproof foot member having a support bolt that supports the upper floor of the double floor and a soundproofing device that is installed on the lower floor and installed on the lower floor.
The soundproofing device is a cylindrical pedestal portion having a through hole, a cushion material, and a pressure nut having a female screw hole are sequentially stacked from below, and a fastening bolt is inserted into the through hole and screwed into the female screw hole. Yes,
The upper surface of the flange portion of the tightening bolt comes into contact with the periphery of the through hole in the lower surface of the pedestal portion, and the cushioning material is forcibly compressed between the pedestal portion and the pressure nut by tightening the pressure nut. ,
By forming an annular protrusion on the lower surface of the pedestal portion, the tightening bolt can be displaced downward when a load is applied from above,
The soundproof foot member of a double floor, wherein the support bolt is mounted on a mounting portion on an upper surface of the pressure nut.

It has been discovered that noise in the 63 Hz band can be greatly improved by previously compressing and deforming the cushion material.
The cushion material may be any material having excellent elasticity, such as a synthetic resin, natural rubber, or a soft resin such as an elastomer, and the hardness is suitably about Hs 55 degrees to Hs 75 degrees. It is desirable that the compression rate be about 80% to 90%.

[Claim 3]
According to the present invention, the pedestal portion includes an upper pedestal plate and a lower pedestal plate support. The pedestal plate is made of a hard material such as plastic or metal, and the diameter of the through hole is larger than the diameter of the support bolt. 3. The double floor soundproof foot member according to claim 1, wherein the base plate support is made of an elastic body such as rubber, and the diameter of the through hole is larger than the diameter of the flange portion of the support bolt. .

  When the pedestal is composed of a hard pedestal plate and an elastic pedestal receiving plate, the hard pedestal plate ensures compression of the cushioning material, and the elastic pedestal receiving plate has a higher frequency than the 63 Hz band. The impact sound reduction performance can be further improved.

[Claim 4]
Further, the present invention is the soundproof foot member for a double floor according to claim 3, wherein the pedestal plate support is harder than the cushion material.

  If the hardness of the pedestal plate holder is smaller than the hardness of the cushion material, the effect of reducing the noise in the 63 Hz band may be reduced, and the sinking of the upper floor when a load is applied to the upper floor increases, which is not preferable. The hardness of the base plate holder is suitably about Hs 65 degrees to Hs 80 degrees.

[Claim 5]
The present invention also provides a soundproof foot member for a double floor according to any one of claims 1 to 4, wherein a sound insulation sheet having an outer diameter larger than the outer diameter of the soundproofing tool is sandwiched between the cushion material and the pressure nut. It is.

  By providing the sound insulation sheet, the sound insulation effect can be improved. As the sound insulating sheet, a rubber sheet having a thickness of about 6 mm to 12 mm, a soft plastic sheet, and the like are appropriate.

[Claim 6]
Moreover, this invention is the double floor characterized by having supported the upper floor by the sound-insulating foot member in any one of Claims 1-5.

According to the present invention, noise in the 63 Hz band can be significantly improved by compressing and deforming the cushion material in advance.
In addition, the sinking of the upper floor when a load is applied to the upper floor is reduced, the uncomfortable feeling when walking on the upper floor is eliminated, and the inclination of the upper floor when heavy furniture is installed is also reduced.

It is a section explanatory view of a soundproof foot member and a double floor of an example. 1 is a cross-sectional explanatory view of a soundproofing device 1. 3 is a bottom view of a base plate 21. FIG. 3 is a top view of the cushion material 3. FIG. 3 is a top view of the pressure nut 4. FIG. It is a section explanatory view of soundproofing equipment 1a. It is a section explanatory view of soundproofing equipment 1b. It is a section explanatory view of soundproofing tool 1c. It is a section explanatory view of the conventional soundproof foot member.

  FIG. 1 is a cross-sectional explanatory view of a soundproof foot member and a double floor according to the embodiment, and FIG.

The soundproof foot member shown in FIGS. 1 and 2 includes a support bolt 5 and a soundproofing device 1 provided at the lower end thereof.
The support bolt 5 is made of plastic or metal (in this embodiment, made of plastic having a diameter of 16 mm), and a flange portion 5a is integrally formed at the lower end.

The soundproofing device 1 is formed by sequentially stacking a cylindrical pedestal portion 2 having a through hole, a cushion material 3 and a pressure nut 4 from below, and the support bolt is inserted into the through hole.
The pedestal portion 2 includes a pedestal plate 21 and a pedestal plate support 22.
The pedestal plate 21 is made of a hard material such as plastic or metal (in this embodiment, a disc-shaped plastic plate having a diameter of 40 mm), and a through hole 21a through which a support bolt is inserted is formed at the center. The upper surface of the flange portion 5a is an abutting surface 21b that abuts, and an annular protrusion 21c is formed around the lower surface so as to protrude downward. (Figure 3)
The base plate holder 22 is made of synthetic rubber having an Hs hardness of 70 degrees, has a donut plate shape with a diameter of 40 mm, and a thickness of 8 mm, and is positioned with an annular protrusion 21c of the base plate fitted into the central through hole 22a. . Therefore, the diameter of the through hole 22a is larger than the diameter of the flange portion 5a of the support bolt and the outer diameter of the annular protrusion 221c. The base plate support 22 functions as an annular ridge, and the support bolt can be displaced downward when a load is applied from above.

  The cushion material 3 is made of synthetic rubber having an Hs hardness of 65 degrees, has a cylindrical shape with an outer diameter of 28 to 40 mm and a thickness of 30 mm, and has a through hole 3 a through which the support bolt 5 is inserted at the center, and a bulging portion 3 b at the outer periphery. Is formed. (Fig. 4)

  The pressure nut 4 is made of plastic or metal (in this embodiment, made of a disk-shaped plastic having a diameter of 40 mm), and a through hole 4a (female screw hole) into which the support bolt 5 is screwed is formed at the center, and the lower end is a cushioning material. The flange 4b has a large diameter so that 3 can be sufficiently compressed, and four ribs 4c for reinforcement are formed on the upper surface thereof in the radial direction. (Fig. 5)

  By tightening the pressure nut 4 downward, the cushion material 3 is forcibly compressed between the pedestal 2 and the pressure nut 4, and the thickness thereof is compressed and deformed from 30 mm to 25 mm.

The soundproof foot members of FIGS. 1 and 2 are arranged at appropriate intervals on the lower floor 7 such as a concrete slab, and the upper floor 8 is constructed on the upper portion of the support bolt 5.
The upper part of the support bolt 5 is screwed to a receiving nut 61 attached to a wooden, plastic or metal receiving plate 6 (in this embodiment, a wooden bundle plate). A groove (not shown) is formed on the upper end surface of the support bolt 5, and the height of the receiving plate can be adjusted by rotating it from above with a screwdriver or the like.
An upper floor 8 is attached to the upper surface of the receiving plate 6. The upper floor 8 is made of a particle board undercoat material 8a and a flooring finish material 8b.

The soundproofing device 1a in FIG. 6 is obtained by sandwiching a soundproofing sheet 9 between the cushion material 3 and the pressure nut 4 in the embodiment of FIG. 2, and the other configurations are the same as the soundproofing device 1 in FIG.
The material of the sound insulation sheet 9 is a sheet formed by mixing asphalt and iron powder.

  The soundproofing device 1b of FIG. 7 is obtained by integrally molding the pedestal portion 2 of the embodiment of FIG. 2 with plastic. An annular ridge 2a is integrally formed on the outer peripheral portion of the lower surface so that the support bolt 5 can be displaced downward when a load is applied from above.

The soundproofing device 1 in FIG. 8 includes a pedestal 2, a cushion material 3, a pressure nut 4, and a fastening bolt 10.
The pedestal portion 2 includes a pedestal plate 21 and a pedestal plate support 22.
The pedestal plate 21 is made of a hard material such as plastic or metal, and a through hole through which the fastening bolt 10 is inserted is formed at the center. A lower surface around the through hole is a contact surface with which the upper surface of the flange portion 10a of the fastening bolt 10 contacts. An annular projection is formed protruding downward around the periphery.
The base plate receiver 22 is made of synthetic rubber, has a donut plate shape, and is positioned by fitting an annular protrusion of the base plate into the central through hole 22a. The base plate support 22 functions as an annular ridge, and the tightening bolt can be displaced downward when a load is applied from above.
The cushion material 3 is made of a cylindrical synthetic rubber.

The pressure nut 4 is made of plastic or metal, and has a female screw hole in the center where the fastening bolt 10 is screwed. In this embodiment, the female screw hole is a through hole, but it is not necessarily required to be a through hole.
A mounting portion 4 d for mounting the support bolt is recessed in the upper portion of the pressure nut 4. The support bolt 5 is inserted into and supported by the mounting portion 4d, and the small diameter portion 5b at the lower end is inserted into the female screw hole of the pressure nut. The shape of the mounting portion is not limited to this embodiment, and any shape may be used as long as it can be supported by mounting a support bolt.

  By tightening the pressure nut 4 downward, the cushion material 3 is forcibly compressed between the pedestal 2 and the pressure nut 4, and the thickness thereof is compressed and deformed from 30 mm to 25 mm.

  In the present embodiment, the rotation of the support bolt is facilitated when the support bolt is rotated with a screwdriver or the like from above in order to adjust the height of the receiving plate, as compared with the soundproofing devices 1, 1a, 1b. .

For the example of FIG. 1 and the comparative example (conventional example) of the structure of FIG. 9, the reduction amount of heavy impact sound (Table 1) and the reduction amount of lightweight impact sound (Table 2) were measured.
As can be seen in Table 1, the amount of reduction in the weight impact sound is significantly higher in the example than in the comparative example in the 63 Hz band. Above the 125 Hz band, the example is slightly lower than the comparative example, but the weight impact sound of the 63 Hz band has a much greater effect on human hearing than the other bands. It can be said that the reduction amount of the weight impact sound is significantly higher than that of the comparative example.
Moreover, as can be seen in Table 2, the amount of reduction in lightweight impact sound was almost the same between the example and the comparative example.

1, 1a, 1b, 1c Soundproofing equipment 2 Base part 2a Annular ridge 21 Base board 22 Base board holder 3 Cushion material 4 Pressure nut 5 Support bolt 5a Flange part 5b Small diameter part 6 Base plate 61 Receiving nut 7 Lower floor 8 Upper floor 9 Sound insulation sheet 10 Tightening bolt 10a Flange

Claims (6)

In the soundproof foot member of the double floor having a support bolt that supports the upper floor of the double floor and a soundproofing device that is installed on the lower floor and installed on the lower floor,
Having a flange at the lower end of the support bolt;
The soundproofing device is a cylindrical pedestal having a through hole, a cushion material and a pressure nut are sequentially stacked from below, and the support bolt is inserted into the through hole.
The upper surface of the flange portion of the support bolt abuts around the through hole on the lower surface of the pedestal portion, and the cushion material is forcibly compressed between the pedestal portion and the pressure nut by tightening the pressure nut.
A double-floor soundproof foot member, wherein an annular ridge is formed on the lower surface of the pedestal portion so that the support bolt can be displaced downward when a load is applied from above. In the soundproof foot member of the double floor having a support bolt that supports the upper floor of the double floor and a soundproofing device that is installed on the lower floor and installed on the lower floor,
The soundproofing device is a cylindrical pedestal portion having a through hole, a cushion material, and a pressure nut having a female screw hole are sequentially stacked from below, and a fastening bolt is inserted into the through hole and screwed into the female screw hole. Yes,
The upper surface of the flange portion of the tightening bolt comes into contact with the periphery of the through hole in the lower surface of the pedestal portion, and the cushioning material is forcibly compressed between the pedestal portion and the pressure nut by tightening the pressure nut. ,
By forming an annular protrusion on the lower surface of the pedestal portion, the tightening bolt can be displaced downward when a load is applied from above,
The double-floor soundproof foot member, wherein the support bolt is mounted on a mounting portion on an upper surface of the pressure nut.   The pedestal portion is composed of an upper pedestal plate and a lower pedestal plate support, the pedestal plate is made of a hard material such as plastic or metal, and the diameter of the through hole is larger than the support bolt diameter and smaller than the flange portion, The double floor soundproof foot member according to claim 1 or 2, wherein the pedestal plate support is made of an elastic body such as rubber, and the diameter of the through hole is larger than the diameter of the flange portion of the support bolt.   The soundproof foot member for a double floor according to claim 3, wherein the pedestal plate support has a hardness higher than that of the cushion material.   The soundproof foot member for a double floor according to any one of claims 1 to 4, wherein a sound insulation sheet having an outer diameter larger than the outer diameter of the soundproofing tool is sandwiched between the cushion material and the pressure nut.   A double floor, wherein the upper floor is supported by the soundproof foot member according to any one of claims 1 to 5.

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