JP3878987B2 - Structure between the upper floor and the lower ceiling of a house - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of the upper and lower parts of a house.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a wooden house having two or more floors, it has been a problem that residents downstairs are inconvenienced by sounds made by residents on the floor. The above sounds include walking sounds such as slippers from walking, impact sounds due to lightweight objects such as table dragging sounds (light floor impact sounds), and impact sounds due to heavy objects such as children's jumping sounds (heavy floor impact sounds) In particular, heavy floor impact noise is a problem in Japan.
[0003]
On the other hand, conventionally, as a sound insulation structure for a house floor, it is known to attach a sound insulation material to the back surface of the floor panel. However, wood-based houses have a lower barrier against heavy-floor impact sound than concrete-based houses due to the peculiar nature of wood, so this measure against heavy floor impact sounds has not been easy. In addition, there is a problem that the work of attaching the sound insulating material is troublesome when it is attempted at the construction site.
[0004]
Furthermore, recent floor wall materials have been required to have heat insulation properties in terms of cooling and heating efficiency.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and has a structure of a portion between the upper floor and the lower ceiling of a house that has a high effect of reducing heavy floor impact noise, can provide heat insulation to a house, and is easy to construct. It is to provide.
[0006]
[Means for Solving the Problems]
That is, the invention of claim 1 sprays urethane foam raw material on the joists constituting the upper floor in a wooden house of two or more floors and the floor base material rear surface disposed on the joists, and the joists and floor foundations are sprayed. This invention relates to a structure of a portion between an upper floor and a lower ceiling of a house, characterized in that an underfloor urethane foam that is closely integrated with the material and foamed is provided on the back surface of the floor base material between the joists.
[0007]
Further, the invention of claim 2 is directed to the back surface of the ceiling material, wherein a urethane foam raw material is blown onto the back surface of the ceiling material in the lower floor of a wooden house of two or more floors and is foamed in close contact with the ceiling material. The present invention relates to the structure of the part between the upper floor and the lower ceiling of the house characterized by being provided.
[0008]
The invention of claim 3 is characterized in that the urethane foam has a closed cell ratio measured by ASTM D 2856 of 10% or less and a density measured by JIS K 7222 of 5 to 20 kg / m ^3. Or, it relates to the structure of the part between the upper floor and the lower ceiling of the three houses.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view showing the structure of a portion between an upper floor and a lower ceiling of a house according to one embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing an outline at the time of partial construction between the upper floor and the lower ceiling of FIG. 3 is a partial cross-sectional view showing an outline of the structure in another embodiment, FIG. 4 is a partial cross-sectional view showing an outline of a partial construction between the upper floor and the lower floor ceiling of FIG. 3, and FIG. 5 is a measurement of heavy floor impact sound. It is a graph which shows a result.
[0010]
In the embodiment of the present invention shown in FIG. 1, the structure between the upper floor and the lower floor of the house is a joist 11 constituting the floor 10 of the upper floor (for example, the second floor of a two-storey house) in a wooden house having two or more floors. 2 and a back surface 13 of the floor base material 12 disposed on the joist 11, and a foamed urethane foam material is sprayed onto the joist 11 and the floor base material 12 as shown in FIG. The back urethane foam P <b> 1 is provided on the floor base material back surface 13 between the joists 11. Thus, since the floor back urethane foam P1 is foam-molded on the floor base material back surface 13 and the joist 11 surface, the floor base material back surface 13 and the joist 11 surface can be covered in series without gaps, High sound insulation and heat insulation effect can be obtained.
[0011]
The joists 11 are installed at predetermined intervals between large beams (not shown), and a floor base material 12 is disposed on the joists 11. The floor base material 12 is made of an appropriate material such as plywood. A floor surface material 14 such as flooring is laminated on the surface of the floor base material 12. Further, a ceiling material 15 on the lower floor (for example, the first floor in a two-story house) is suspended from the joist 11 via a suspension tree (not shown).
[0012]
In the construction of the underfloor urethane foam P1, first, the floor base material 12 is fixed and disposed on the joists 11 on the upper floor (downstairs ceiling). Thereafter, as shown in FIG. 2, the urethane foam material is sprayed and foamed on the joists 11 and the floor base material back surface 13 from the downstairs side. When the foam molding of the underfloor urethane foam P1 is completed, the ceiling material 15 is attached from the downstairs side. The code | symbol 19 shows the nozzle of a well-known spray type discharge apparatus (construction apparatus for on-site foaming).
[0013]
The other embodiment shown in FIG. 3 has a structure in which a urethane foam raw material is sprayed on the back surface 16 of the ceiling material 15 to provide a ceiling-back urethane foam P2 that is closely integrated with the ceiling material 15 and foamed. Become. Thus, since the urethane foam P2 on the back of the ceiling is directly foam-molded on the back surface 16 of the ceiling material, it is highly adhered to the ceiling material 15 and has high sound insulation and heat insulation effects.
[0014]
In this structure, as shown in FIG. 4, after the joist 11 of the floor portion on the upper floor (for example, the second floor) is constructed, the ceiling material 15 on the lower floor (for example, the first floor) is first suspended from the joist 11. The urethane foam raw material is sprayed from the upper floor (for example, the second floor) side and foamed to the lower ceiling material back surface 16 of the lower floor to form the ceiling back urethane foam P2. Thereafter, the floor base material 12 on the upper floor (for example, the second floor) is attached to the joists 11, and the floor surface material 14 is disposed on the floor base material 12.
[0015]
As yet another aspect, an underfloor urethane foam P1 is provided on the floor base material 12 and joists 11 on the floor, and the ceiling back urethane foam is provided on the ceiling material 15 on the lower floor facing the floor base material 12 on the floor. P2 may be provided. Thus, if the foam body directly foam-molded is provided in both the floor base material 12 and the ceiling material 15, it will become excellent in a sound-insulation and a heat insulation effect.
[0016]
The urethane foams P1 and P2 formed by being sprayed on the floor base material back surface 13 or the ceiling material back surface 16 have a closed cell ratio measured by ASTM D 2856 of 10% or less, and a density measured by JIS K 7222 is 5. An open cell type rigid urethane foam of ˜20 kg / m ³ is preferred.
[0017]
By setting the closed cell ratio to 10% or less, particularly 7% or less, and further 5% or less, sound easily enters the cell and is efficiently attenuated in the cell, so that soundproofing is further enhanced. . In addition, the density is 5 to 20 kg / m ³ , further 5 to 15 kg / m ³ , which is much lower than that of a normal urethane foam. The load is reduced. In order to obtain the density, the cell diameters of the urethane foams P1 and P2 are set to 0.15 to 0.3 mm, particularly 0.15 to 0.25 mm, and further 0.15 to 0.2 mm. It is preferable to make it considerably larger than the cell type rigid polyurethane foam.
[0018]
Moreover, the thickness of this foam P1, P2 is made into the appropriate value according to the space | interval between the joist 11 and the ceiling material 15, and it is excellent in the soundproofing effect and heat insulation effect, so that thickness is large. The gap between the floor base material 12 on the second floor and the ceiling material 15 on the first floor in a general house is 40 cm at the maximum, but if the foams P1 and P2 have a thickness of 1 cm or more, a sound insulation effect can be obtained.
[0019]
Next, a measurement experiment of a heavy floor impact sound performed for the embodiment of the present invention will be described. The structure between the upper floor and the lower ceiling used in this experiment is the structure shown in FIG. 1, that is, the joist 11 and the floor base material 12 (plywood having a thickness of 30 mm) constituting the second floor in a two-story wooden house. The following urethane foam raw material having an open cell structure is sprayed and foamed to form the urethane foam P1 having physical properties with a thickness of 3 to 4 cm.
[0020]
The urethane foam raw material is blended in such a way that the polyol is 100 parts by weight of a polypropylene glycol polyether polyol (manufactured by Sanyo Chemical Co., Ltd., trade name “No. 33”), and triethylenediamine (manufactured by Sankyo Air Products Co., Ltd., trade name). "DABCO 33LV") 2 parts by weight, as a foam stabilizer, linear polysiloxane-polyoxyalkylene copolymer (manufactured by Toray Dow Corning Silicone Co., Ltd., trade name "SH-190") 1 part by weight, as a flame retardant Trischloropropyl phosphate (manufactured by Daihachi Chemical Co., Ltd., trade name “TMCPP” 60 parts by weight, water 25 parts by weight, polyisocyanate polymer MDI (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name “Millionate MR-100”) 207 The resulting foam is ASTM. Closed cell content as measured by 2856 6%, density measured by JIS K 7222 is 11 kg / ^{m 3,} the cell size was 0.06 mm.
[0021]
The measurement method of heavy floor impact sound is based on the provisions of the measurement method of floor impact sound level at the construction site of the building (JIS A 1418), using a heavy floor impact sound generator (SATSUKIISEAKUSYO BM) Installed in the center of the. The heavy floor impact sound was measured using two precision sound level meters (RION NL-11 NL-14) in the sound receiving room on the first floor.
[0022]
The graph shown in FIG. 5 shows the first floor room (example sound receiving room) in the above-described embodiment in which the urethane foam raw material is sprayed to form the back floor urethane foam P1, and the first floor composed of the structure that has not been constructed. It represents the measurement result of the heavy floor impact sound level in the room (comparative sound receiving room). In the graph, the solid line represents the weight impact sound level of the example sound receiving chamber, and the broken line represents the weight impact sound level of the comparative example sound receiving chamber.
[0023]
From this result, the lower room (example sound receiving room) of the embodiment having the structure of the invention has a wider frequency range from 125 Hz to 4 KHz than the lower room (comparative sound receiving room) of the comparative example. It was confirmed that the heavy floor impact sound level was about 10 dB.
[0024]
【The invention's effect】
As illustrated and described above, according to the invention of claim 1, since the foam is closely integrated with the urethane foam, the joist and the back surface of the floor base material, the sound on the floor is efficiently insulated. And has a heat insulating effect. Moreover, since the foam can be formed by spraying, on-site construction is also easy.
[0025]
According to the invention of claim 2, since the urethane foam is tightly integrated with the back surface of the ceiling material, the sound on the floor can be efficiently insulated and also has a heat insulating effect. Moreover, since the foam can be formed by spraying, on-site construction is also easy.
[0026]
Moreover, according to the invention of Claim 3, the sound insulation and heat insulation in the structure of Claims 1 and 2 can be made higher.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a structure of a portion between an upper floor and a lower ceiling of a house according to one embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing an outline of partial construction between the upper floor and the lower ceiling of FIG. 1;
FIG. 3 is a partial cross-sectional view schematically showing a structure of a portion between an upper floor and a lower ceiling in another embodiment.
4 is a partial cross-sectional view showing an outline at the time of partial construction between the upper floor and the lower ceiling in FIG. 3;
FIG. 5 is a measurement result of a heavy floor impact sound level for an example and a comparative example.
[Explanation of symbols]
10 Floor 11 on the floor 11 joist 12 floor base material 13 floor base material back surface 15 ceiling material 16 ceiling material back surface

Claims (3)

Urethane foam raw material was sprayed on the joists constituting the upper floor in the wooden house of two or more floors and the back surface of the floor base material disposed on the joists, and the foam and the floor joists were closely integrated with the joists and the floor base material. A structure of a portion between an upper floor and a lower ceiling of a house, characterized in that an underfloor urethane foam is provided on the back surface of the floor base material between the joists. In a residential house characterized by providing a urethane foam on the back of the ceiling material, which is foamed by blowing and foaming urethane foam raw material onto the back of the ceiling material in the lower floor of a wooden house on two or more floors. The structure between the upper floor and the lower ceiling. 4. The upper floor of a house according to claim 1, wherein the urethane foam has a closed cell ratio measured by ASTM D 2856 of 10% or less and a density measured by JIS K 7222 of 5 to 20 kg / m ^3. And the structure of the part between the downstairs ceiling.

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