Anti-vibration material for floating bed

Abstract

To provide a vibration-proof material for floating floors that can reduce the load during lifting and transportation and can reduce costs in a wet floating floor structure. [Solution] A floating floor vibration-proofing material 1 is arranged on a floor slab 4 and comprises a plate-shaped buffer body 2 in contact with the underside of the holding concrete 5 and a plate-shaped vibration insulator 3 in contact with the side of the holding concrete 5. The buffer body 2 and the vibration insulator 3 are made of the same material and arranged in contact with each other. The floating floor vibration-proofing material 1 is made of a single type of polyolefin resin foam, is a plate-shaped material with a thickness of 10 to 15 mm, and has a dynamic spring constant of 9×10 7 ~18×10 7 N / (m 2 ·m).

Description

[Technical field]

[0001] The present invention relates to a vibration-isolating material for floating floors that absorbs vibrations of a floating floor in a wet floating floor structure of a building such as an apartment building. [Background technology]

[0002] In buildings such as apartment buildings, floor impact sounds generated by residents on upper floors include light impact sounds such as knocks and clangs with a vibration frequency of 125 Hz or more, and heavy impact sounds such as thumps and thuds with a vibration frequency of less than 125 Hz. Anti-vibration technologies for these floor impact sounds are described in, for example, Patent Documents 1 to 3.

[0003] Patent Document 1 describes a floating floor structure in which a floating floor layer is laid on a concrete slab floor via a buffer layer made of a buffer material and a standing insulation material, the buffer material having a thickness of 25 to 60 mm and a load capacity of 250 kg / m 2 The dynamic spring constant per unit area measured under the conditions is 0.8 to 4.8 × 10 6 N / (m 2 A floating floor structure is disclosed, which is characterized in that it is formed from expanded polypropylene.

[0004] Patent Document 2 discloses a floating floor structure in which a buffer body is placed on a floor slab and a floor section is placed on the buffer body so that the load of the floor section is supported via the buffer body, characterized in that the buffer body is made of a polypropylene-based resin foam and a water-resistant elastic body that has smaller creep deformation than the foam.

[0005] Patent Document 3 describes a vibration-proof material for a floating floor structure, which is composed of supports arranged on a structure at a distance from each other and supporting a live load, which is a combination of the load of a floor body placed on the structure and the load applied to the floor body, and a buffer body arranged on the structure so as to fill the gaps between the supports and supports the load of a concrete material that forms the floor body when hardened. The supports are made of polyurethane foam having a hardness that can support the live load, and the buffer body is made of soft polyurethane foam, and the hardness of the buffer body is set to be softer than the supports and capable of supporting the load of the concrete material according to the thickness of the concrete material, and the buffer body has a dynamic spring constant of 11.0×10 under the condition that the hardness according to the thickness of the concrete material is satisfied. 6 N / (m 2 The present invention discloses a vibration-proof material for a floating floor structure, characterized in that the vibration-proof material is set to be equal to or less than 1.0 m. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 6-45963 [Patent Document 2] JP 2002-294997 A [Patent Document 3] JP 2016-44394 A Summary of the Invention [Problem to be solved by the invention]

[0007] The invention of Patent Document 1 is limited to using foamed polypropylene as a cushioning material in a wet floating floor structure, but since the thickness is 25 to 60 mm, there is a problem in that lifting and transporting it is burdensome and costly.

[0008] The invention of Patent Document 2 describes that in a wet-type floating floor structure, the lower limit of the cushioning body is preferably 10 mm, and particularly 20 mm. However, there is a problem in that the cushioning body is made of a polypropylene resin foam and a water-resistant elastomer that has less creep deformation than the foam, which increases the cost.

[0009] The invention in Patent Document 3 states that the thickness of the vibration-proof material in a wet floating floor structure is 25 to 50 mm. The vibration-proof material is composed of a buffer body that supports the load of the fresh concrete and a support body that supports the live load on the floor material, which creates problems such as burdens on lifting and transporting, and is costly.

[0010] The present invention has been devised in view of these problems, and its object is to provide a vibration-proof material for floating floors that can reduce the load during lifting and transportation in wet floating floor structures and reduce costs. [Means for solving the problem]

[0011] The vibration-isolating material for a floating floor according to claim 1 is disposed on a floor slab and comprises a plate-shaped buffer body in contact with the underside of the holding concrete, and a plate-shaped vibration insulator in contact with the side of the holding concrete, the buffer body and the vibration insulator being made of the same material and disposed in contact with each other, the vibration-isolating material for a floating floor being formed of a single type of polyolefin-based resin foam, being in the form of a plate having a thickness of 10 to 15 mm, The dynamic spring constant is 15.2 x 10 when the thickness is 12.5 mm. 7 N / (m 2 ·m) It is characterized in that:

[0012] Claim 2 The vibration-proof material for a floating floor described in claim 1 is characterized in that the polyolefin resin foam is a high-density polyethylene resin foam or a polypropylene resin foam. Effect of the Invention

[0013] The vibration-proofing material for floating floors of the present invention is not intended to provide a vibration-proofing effect against conventional heavy-weight impact sounds or light-weight impact sounds, but is an invention that is specialized in vibration-proofing light-weight impact sounds, without expecting a vibration-proofing effect against heavy-weight impact sounds with vibration frequencies of less than 125 Hz, such as children jumping around. The cushioning material for the vibration-proofing material for floating floors of the present invention is not a cushioning material made of at least two types of materials, one with vibration-proofing properties and one with load-bearing properties, as is commonly used, but is formed from a single type of polyolefin-based resin foam, and is thinner than the typical thickness of 25 mm to 50 mm, which has the effect of reducing costs and weight, thereby reducing the load during lifting and transportation.

[0014] In addition, the dynamic spring constant of the single type of polyolefin resin foam of the floating floor vibration-proof material is increased, so that the floating floor vibration-proof material can withstand a load of 800 kg / m2, taking into account the combined load of the concrete support and the live load of people, etc. 2 It has a load-bearing capacity capable of supporting up to 125 Hz, and also has vibration-isolating properties that prevent the transmission of light impact sounds with a frequency of 125 Hz or more, such as the sound of an adult walking, to the floor slab.

[0015] Furthermore, since no gap is created between the plate-shaped buffer body in contact with the underside of the holding concrete and the plate-shaped vibration insulator in contact with the side of the holding concrete, vibration is prevented from being transmitted directly to structural members such as columns, beams, or floor slabs, thereby preventing a reduction in the vibration-damping effect of the buffer body. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an explanatory diagram of a wet-type floating floor structure using the floating floor vibration-proof material of the present invention. [Diagram 2] 1A and 1B are explanatory diagrams of a buffer body, in which (a) is an explanatory diagram in a plan view, and (b) is an explanatory diagram in a front view of the buffer body as viewed from the arrow A in (a). [Diagram 3] 1A is an explanatory diagram of a vibration isolator, in which (a) is an explanatory diagram from a plan view, (b) is an explanatory diagram of a front view of arrow B in (a), and (c) is an explanatory diagram of a side view of arrow C in (a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Currently, in the construction industry, an important goal is to construct cushioning materials that have vibration-damping properties against both heavy and light impact noise in order to provide a quiet environment for residents, and technology is being developed for cushioning materials that have vibration-damping properties against both heavy and light impact noise.

[0018] The Ministry of Internal Affairs and Communications predicts that in 2050, households with married couples and children will account for approximately 18%, single parent households with children for approximately 11%, married couple households for approximately 19%, single person households for approximately 42%, and other households for approximately 10%, with elderly single person households accounting for approximately 55% of single person households. Based on the above prediction, it can be predicted that households without children will account for approximately 61 to 71%.

[0019] The inventor predicted that in the near future, heavy impact sounds with vibration frequencies below 125 Hz, such as those caused by children jumping, will hardly occur in buildings such as apartment buildings, and only light impact sounds with vibration frequencies of 125 Hz or more, such as those caused by adults walking, will occur.The inventor came up with the idea that if heavy impact sounds were excluded from the scope of floor impact sound vibration prevention measures and the measures were limited to light impact sounds, the load during lifting and transportation could be reduced and costs could be reduced, and he came up with the floating floor vibration prevention material 1 of the present invention.

[0020] The vibration-proof material for a floating floor 1 of the present invention is used in a wet-type floating floor structure, and as shown in FIG. 1, is disposed on a floor slab 4, and comprises a plate-shaped buffer body 2 in contact with the underside of a holding concrete 5, and a plate-shaped vibration insulator 3 in contact with the side of the holding concrete 5. The buffer body 2 and the vibration insulator 3 are made of the same material and disposed in contact with each other. The vibration-proof material for a floating floor 1 is formed of a single type of polyolefin resin foam, is plate-shaped with a thickness t of 10 to 15 mm, and has a dynamic spring constant of 9×10 7 ~18×10 7 N / (m 2 ·m).

[0021] The floating floor vibration-proofing material 1 is provided on the floor slab 4 and includes the plate-shaped buffer body 2 having a size of, for example, 900 mm×1200 mm as shown in FIG. 2(a) and (b) in contact with the underside of the holding concrete 5, and the plate-shaped vibration insulator 3 having a size of, for example, 900 mm×150 mm or 1200 mm×150 mm as shown in FIG. 3(a) to (c) in contact with the side of the holding concrete 5. The size of the buffer body 2 or the vibration insulator 3 can be set arbitrarily according to the construction site. The floating floor vibration-proofing material 1 has vibration-proofing properties that prevent the transmission of vibration from the holding concrete 5 side to the floor slab 4 side, and has load-bearing properties against the holding concrete 5 and live load. The live load means a load loaded on the holding concrete 5, such as furniture or flooring material.

[0022] The buffer 2 and the vibration insulator 3 are made of the same material, and are arranged in contact with each other so as to block the transmission path of vibration from the holding concrete 5 to the floor slab 4, columns, or other structural members 6. As a result, no gap is generated between the buffer 2 and the vibration insulator 3, and vibration generated in the holding concrete 5 is not transmitted directly to the structural members 6 such as columns, beams, or the floor slab 4, and the buffer 2 and the vibration insulator 3 attenuate the vibration to a level that is not disturbing to people, and transmits the vibration to the floor slab 4.

[0023] The floating floor vibration-proof material 1 is made of a single type of polyolefin resin foam, has a plate shape with a thickness t of 10 to 15 mm, and has a dynamic spring constant of 9×10 7 ~18×10 7 N / (m 2 The polyolefin resin foams include, for example, polyethylene resin foams such as high-density polyethylene resin foams, and polypropylene resin foams. All of them have a closed cell structure, have a low water absorption rate of 0.01% or less, and are excellent in water resistance. All of them are lightweight because they have a specific gravity of 1.0 or less.

[0024] Generally, increasing the flexibility of the buffer body to improve the vibration-proofing properties of the floating floor vibration-proofing material 1 reduces the load-bearing capacity to support the holding concrete 5 and the live load, and increasing the hardness or strength of the buffer body to improve the load-bearing capacity of the floating floor vibration-proofing material 1 tends to reduce the vibration-proofing properties. Also, for floating floor vibration-proofing materials 1 made of the same material, as the thickness t becomes thinner, the amount of deformation relative to the load decreases, and the vibration-proofing properties decrease. As the thickness t becomes thicker, the amount of deformation relative to the load increases, and the vibration-proofing properties also increase.

[0025] The thickness t of the floating floor vibration-proof material 1 is 10 to 15 mm, preferably 11 to 13 mm, and more preferably 12 to 12.5 mm, and the thickness t is generally set to be approximately 50% or more thinner than the thickness of the buffer body 2, which is 25 to 50 mm. If the thickness t of the buffer body 2 is less than 10 mm, the natural frequency of the buffer body 2 increases, and the vibration-proofing properties against light impact noise with a frequency of about 125 Hz decrease, and if the thickness t of the buffer body 2 exceeds 15 mm, the effect of reducing costs decreases.

[0026] The thickness of the vibration-proof material for a floating floor 1 is made thinner by about 50% or more than the general thickness. However, the strength of the vibration-proof material for a floating floor 1 must be strong enough to support the load of the holding concrete 5 and the live load. For example, the dynamic spring constant of Patent Document 1 is set to 0.8 to 4.8 × 10 6 N / (m 2 m) and 11.0×10 6 N / (m 2 m) Dynamic spring constant greater than 9×10 7 ~18×10 7 N / (m 2 The dynamic spring constant is increased to 9×10 7 N / (m 2 If it is less than 18×10 7 N / (m 2 If it exceeds 100 mm, the vibration-proofing property will decrease.

[0027] The dynamic spring constant of the floating floor vibration-proof material 1 is 9×10 7 ~18×10 7 N / (m 2In order to achieve a hardness satisfying the requirement of 0.1-m, a high-density polyethylene resin foam having a higher density and excellent hardness and strength than a low-density polyethylene resin foam, or a polypropylene resin foam having rigidity, is used, since a low-density polyethylene resin foam has a high vibration-proofing property due to its low density and flexibility but a low load-bearing property and therefore makes it difficult to support the holding concrete 5 and the live load.

[0028] Next, the examples and comparative examples are compared. As a prerequisite for the comparison, the vertical distance between the upper surface of the floor slab 4 and the lower surface of the holding concrete 5 is about 150 mm, the thickness of the holding concrete 5 is 150 mm and the thickness t of the floating floor vibration-proof material 1 is 12.5 mm in the example, the thickness of the holding concrete 5 is 25 mm, which is the thickness of a buffer body that is generally used but has a low usage record, and the thickness of the holding concrete 5 is 125 mm, and the thickness of the holding concrete 5 is 50 mm, which is the thickness of the buffer body that is generally used most often, and the thickness of the holding concrete 5 is 100 mm in the comparative example 2. As a result, the mass of the holding concrete 5 becomes the value shown in Table 1.

[0029] [Table 1]

[0030] The vibration-proof materials in the embodiment, comparative example 1, and comparative example 2 are made of the same type of polypropylene resin foam, and the thickness t is different, so the dynamic spring constants are different, as shown in Table 2. The natural frequency is 800 kg / m 2 As number It was calculated using the formula shown in 1.

[0031]

number

[0032] [Table 2]

[0033] Comparing the amount of deflection from Table 2, it is shown that the amount of deflection in the embodiment is 0.05 mm, and the load-bearing capacity against the load of the holding concrete 5 and the live load is sufficient.

[0034] Next, the damping ratio of the polypropylene resin foam was set to 7%, and the value obtained by dividing the generated frequency by the natural frequency was set as the vibration frequency ratio. The vibration transmissibility was calculated for the example, comparative example 1, and comparative example 2. number 2, and the vibration-proof effect amount is calculated. number The results were obtained by the method described above. Table 3 shows the results for the Example, Table 4 shows the results for Comparative Example 1, and Table 5 shows the results for Comparative Example 2.

[0035]

number

[0036]

number

[0037] [Table 3]

[0038] [Table 4]

[0039] [Table 5]

[0040] From Tables 3 to 5, it is shown that the closer the frequency is to 1000Hz for light impact sounds, the smaller the difference in the vibration-proofing effect is, even if there is a difference in the thickness t of the buffer 2, and when the frequency is 63Hz for heavy impact sounds, the difference in the vibration-proofing effect is also larger if there is a difference in the thickness t of the buffer 2. This shows that it is difficult to significantly change the vibration-proofing properties for frequencies approaching 1000Hz for light impact sounds by changing the thickness t of the buffer 2, but in the vicinity of the border between the region of heavy impact sounds with frequencies less than 125Hz and the region of light impact sounds with frequencies of 125Hz or more, it is possible to significantly change whether the buffer 2 has vibration-proofing properties or not for vibrations generated in the holding concrete 5 by changing the thickness t of the buffer 2.

[0041] From Tables 3 to 5, when the thickness of the cushioning body 2 is 50 mm, the vibration transmissibility is small for both heavy impact sounds with a frequency of 63 Hz and light impact sounds with a frequency of 125 Hz or more, providing a vibration-damping effect; when the thickness of the cushioning body 2 is 25 mm, the vibration transmissibility is large for heavy impact sounds with a frequency of 63 Hz and there is no vibration-damping effect, but the vibration transmissibility is small for light impact sounds with a frequency of 125 Hz or more, providing a vibration-damping effect; when the thickness of the cushioning body 2 is 12.5 mm, the vibration transmissibility is large for heavy impact sounds with a frequency of 63 Hz and there is no vibration-damping effect, but the vibration transmissibility is small for light impact sounds with a frequency of 125 Hz or more, providing a vibration-damping effect.

[0042] In addition, as another method of judging the vibration-proof effect, it is generally known that a frequency ratio less than √2 is a resonance region, and a frequency ratio of √2 or more is a vibration-proof region. In this case, when the thickness t of the buffer 2 in the embodiment is 12.5 mm, the frequency ratio for a heavy impact sound of 63 Hz is 0.91, which is less than √2, and it is judged to be a resonance region, but the frequency ratio for a light impact sound of 125 Hz is 1.85, which is √2 or more, which is a vibration-proof region, and it was judged that there is a vibration-proof effect. On the other hand, when the thickness t of the buffer 2 in the comparative example 1 is 25 mm, the frequency ratio for a heavy impact sound of 63 Hz is 1.28, which is √2 or more, which is a vibration-proof region, and the frequency ratio for a light impact sound of 125 Hz is 2.55, which is √2 or more, which is a vibration-proof region, and it was shown that there is a vibration-proof effect.

[0043] From the results of the vibration-proofing effect shown by the vibration transmissibility and the vibration-proofing effect amount, and the results of judging whether the vibration frequency ratio is in the resonance region of less than √2 or the vibration-proof region of √2 or more, it was shown that only when the thickness t of the buffer 2 of the embodiment is 12.5 mm, the vibration-proofing effect cannot be expected in the resonance region for heavy impact sounds with a frequency of 63 Hz, but the vibration-proofing effect can be expected for light impact sounds with a frequency of 125 Hz or more. The same effect as in the embodiment can be expected for the thickness t of 10 to 15 mm, preferably 11 to 13 mm, more preferably 12 to 12.5 mm, which is within ±2.5 mm from the center of 12.5 mm.

[0044] Therefore, the plate is made of a single type of polyolefin resin foam, has a thickness of 10 to 15 mm, and has a dynamic spring constant of 9 × 10 7 ~18×10 7 N / (m 2 The floating floor vibration-proof material 1, which is 0.4-1.0 mm in diameter, is harder and thinner than conventional vibration-proof materials, and therefore has a vibration-proofing effect against light impact sounds with frequencies of 125 Hz or more. This can make a significant contribution to reducing the cost of construction for childless households, whose numbers are predicted to increase in the near future. [Explanation of symbols]

[0045] 1 Vibration isolation material for floating floor 2 Buffer 3. Vibration Isolators 4. Floor slab 5. Reinforced concrete 6 skeleton

Claims

1. A vibration-proofing material for a floating floor, comprising: a plate-shaped buffer body disposed on a floor slab and in contact with the underside of the holding concrete; and a plate-shaped vibration insulator in contact with the side of the holding concrete, The buffer body and the vibration insulator are made of the same material and are disposed in contact with each other, The vibration-proof material for a floating floor is The vibration-proof material for floating floors is formed from a single type of polyolefin-based resin foam, has a plate shape with a thickness of 10 to 15 mm, and has a dynamic spring constant of 15.2 x 107 N / (m2·m) when the thickness is 12.5 mm.

2. 2. The vibration-proof material for a floating floor according to claim 1, characterized in that the polyolefin resin foam is a high-density polyethylene resin foam or a polypropylene resin foam.

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