Vibration-proof material for floating floor

Abstract

To provide a vibration-proof material for a floating floor capable of reducing loads in lifting and transportation, and reducing costs in wet floating floor structure.SOLUTION: A vibration-proof material 1 for a floating floor is provided with a plate-like shock absorber 2 placed on a floor slab 4, in contact with an under surface of pressing concrete 5, and a plate-like vibration insulator 3 in contact with a side surface of the pressing concrete 5. The shock absorber 2 and the vibration insulator 3 are made of the same material and disposed in contact with each other. The vibration-proof material 1 for a floating floor is formed of a single type of polyolefin resin foam, has a plate shape with a thickness of 10 to 15 mm, and has a dynamic spring constant of 9×107 to 18×107 N / (m2 m).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a floating floor vibration-damping material that damps 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 noises caused by residents on upper floors include light impact noises such as knocks and clangs with a frequency of 125 Hz or more, and heavy impact noises such as thuds and thuds with a frequency of less than 125 Hz. Vibration isolation technologies for these floor impact noises 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 insulating material, in which the buffer material has a thickness of 25 to 60 mm and can withstand a load mass of 250 kg / m 2 The dynamic spring constant per unit area measured under the conditions is 0.8~4.8×10 6 N / (m 2 A floating floor structure is disclosed, which is characterized by being 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 less creep deformation than the foam.

[0005] Patent Document 3 describes a vibration-isolating material for a floating floor structure that is composed of supports that are arranged spaced apart from each other on a structure and support a live load that is the sum of the load of a floor body placed on the structure and the load acting on the floor body, and buffers that are arranged on the structure so as to fill the gaps between the supports and support the load of the concrete material that forms the floor body when hardened. The supports are made of polyurethane foam that has a hardness that can support the live load, and the buffers are made of soft polyurethane foam, and the hardness of the buffers is set to be softer than the supports and can support the load of the concrete material in accordance with the thickness of the concrete material, and the dynamic spring constant is 11.0 × 10 under the condition that the hardness is set to be in accordance with the thickness of the concrete material. 6 N / (m 2 The present invention discloses a vibration-damping material for a floating floor structure, characterized in that it is set to have a vibration-damping strength of 1.0 m or less. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 6-45963 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-294997 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-44394 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 buffer material in a wet floating floor structure, but the thickness is 25 to 60 mm, which causes problems such as a burden on lifting and transportation and high costs.

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

[0009] The invention of Patent Document 3 states that the thickness of the vibration-damping material in a wet floating floor structure is 25 to 50 mm, and since the vibration-damping 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, there was a problem that lifting and transportation was burdensome and costly.

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

[0011] The floating floor vibration-isolating material according to claim 1 is a floating floor vibration-isolating material that is disposed on a floor slab and includes a plate-shaped buffer body that contacts the underside of the holding concrete and a plate-shaped vibration insulator that contacts the side of the holding concrete, wherein the buffer body and the vibration insulator are disposed in contact with each other and made of the same material, and the floating floor vibration-isolating material is formed from a single type of polyolefin resin foam, is plate-shaped with a thickness of 10 to 15 mm, and has a dynamic spring constant of 9 x 10 7 ~18×10 7 N / (m 2 ·m).

[0012] The vibration-proof material for a floating floor according to claim 1 is characterized in that in claim 1, the polyolefin resin foam is a high-density polyethylene resin foam or a polypropylene resin foam. [Effects of the Invention]

[0013] The vibration-damping material for floating floors of the present invention is not intended to provide vibration-damping effects against either heavy-weight or light-weight impact noise as in the past, but is an invention that is specialized in vibration-damping against light-weight impact noise, without expecting vibration-damping effects against heavy-weight impact noise with a vibration frequency of less than 125 Hz, such as that of children jumping around.The buffer body of the vibration-damping material for floating floors of the present invention is not a buffer body that is generally constructed from at least two types of material, one with vibration-damping properties and one with load-bearing properties, but is formed from a single type of polyolefin resin foam, and is thinner than the general thickness of 25 mm to 50 mm, thereby achieving the effects of reducing costs and weight, and reducing the load when lifting and transporting.

[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 800 kg / m, taking into account the total load of the concrete support and the live load of people, etc. 2 It has the load-bearing capacity to support up to 100kg, and also has vibration-damping properties that prevent the transmission of light impact sounds with a frequency of 125Hz or more, such as the sound of an adult walking, to the floor slab.

[0015] Furthermore, since there is no gap between the plate-shaped buffer body that contacts the underside of the holding concrete and the plate-shaped vibration insulator that contacts the side of the holding concrete, vibrations are prevented from being transmitted directly to the main body such as columns, beams, or floor slabs, which has the effect of not reducing the vibration-damping effect of the buffer body. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a wet-type floating floor structure using the floating floor vibration-proof material of the present invention. [Figure 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 arrow A in (a). [Figure 3] 1A and 1B are explanatory diagrams of a vibration insulator, in which (a) is an explanatory diagram of 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 INVENTION

[0017] Currently, in the construction industry, an important goal is to construct shock absorbers that have vibration-damping properties against both heavy and light impact noise in order to provide a quiet environment for residents, and technological developments are being made into shock absorbers that have vibration-damping properties against both heavy and light impact noise.

[0018] The Ministry of Internal Affairs and Communications predicts that by 2050, households consisting of a married couple and their children will account for approximately 18%, single-parent households will account for approximately 11%, married couple households will account for approximately 19%, single-person households will account for approximately 42%, and other households will account for approximately 10%, with approximately 55% of single-person households being elderly single-person households. Based on this 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 noises with a frequency of less than 125 Hz, such as those caused by children jumping, will hardly be generated in buildings such as apartment buildings, and only light impact noises with a frequency of 125 Hz or more, such as those caused by adults walking, will be generated.He came up with the idea that if heavy impact noises were excluded from the scope of floor impact noise vibration isolation measures and the floor impact noise vibration isolation measures were limited to light impact noises, the load during lifting and transportation could be reduced and costs could be reduced, and he came up with the floating floor vibration isolation material 1 of the present invention.

[0020] The floating floor vibration-proof material 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, and the buffer body 2 and the vibration insulator 3 are disposed in contact with each other and made of the same material, and the floating floor vibration-proof material 1 is formed from 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-damping material 1 is disposed on the floor slab 4 and contacts the underside of the holding concrete 5. The plate-shaped buffer 2 has dimensions of, for example, 900 mm x 1200 mm, as shown in Figures 2(a) and 2(b), and contacts the underside of the holding concrete 5. The plate-shaped vibration isolator 3 has dimensions of, for example, 900 mm x 150 mm or 1200 mm x 150 mm, as shown in Figures 3(a) to 3(c), and contacts the side of the holding concrete 5. The size of the buffer 2 or the vibration isolator 3 can be set arbitrarily to suit the construction site. The floating floor vibration-damping material 1 has vibration-damping properties that prevent vibration from propagating from the holding concrete 5 to the floor slab 4, and is capable of withstanding the holding concrete 5 and live load. The live load refers to the load placed on the holding concrete 5, such as furniture or flooring.

[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, and other structural elements 6. As a result, no gap is created between the buffer 2 and the vibration insulator 3, and vibrations generated in the holding concrete 5 are not transmitted directly to the structural elements 6, such as columns, beams, or the floor slab 4, but are transmitted to the floor slab 4 after being attenuated by the buffer 2 and the vibration insulator 3 to a level that is not noticeable to people.

[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-based resin foams include, for example, polyethylene-based resin foams such as high-density polyethylene resin foams, and polypropylene-based resin foams. All of these have closed cell structures, have low water absorption rates of 0.01% or less, are excellent in water resistance, and are lightweight with specific gravities of 1.0 or less.

[0024] Generally, if the flexibility of the buffer is increased in an attempt to improve the vibration-proofing properties of the floating floor vibration-proofing material 1, the load-bearing capacity to support the holding concrete 5 and the live load decreases, and if the hardness or strength of the buffer is increased in an attempt to improve the load-bearing capacity of the floating floor vibration-proofing material 1, the vibration-proofing properties tend to decrease. 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 25 to 50 mm thickness of the buffer body 2. 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 around 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-isolating material for a floating floor 1 is made thinner by about 50% or more than the general thickness, but the strength of the vibration-isolating 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 has been increased to 9×10 7 N / (m 2 If it is less than 18 × 10 7 N / (m 2 If it exceeds 1 / 2 m, 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 m), a high-density polyethylene resin foam, which has a higher density and is superior in hardness and strength than a low-density polyethylene resin foam, or a polypropylene resin foam, which has rigidity, is used, since a low-density polyethylene resin foam has high vibration-proofing properties due to its low density and flexibility but low load-bearing capacity, making 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 approximately 150 mm, and in the Example, the thickness of the holding concrete 5 is 150 mm and the thickness t of the floating floor vibration-damping material 1 is 12.5 mm. In Comparative Example 1, the thickness of a buffer body that is generally used but has little history of use is 25 mm and the thickness of the holding concrete 5 is 125 mm. In Comparative Example 2, the thickness of a buffer body that is generally used is 50 mm and the thickness of the holding concrete 5 is 100 mm. 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 Example, 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 was calculated using the formula shown in Equation 1.

[0031]

number

[0032] [Table 2]

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

[0034] Next, using 7% as the damping ratio of the polypropylene resin foam and the value obtained by dividing the generated frequency by the natural frequency as the frequency ratio, the vibration transmissibility was calculated using Equation 2 for Example, Comparative Example 1, and Comparative Example 2, and the vibration damping effect was calculated using Equation 3. The results for Example are shown in Table 3, those for Comparative Example 1 in Table 4, and those for Comparative Example 2 in Table 5.

[0035]

number

[0036]

number

[0037] [Table 3]

[0038] [Table 4]

[0039] [Table 5]

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

[0041] From Tables 3 to 5, it can be seen that when the thickness of the buffer 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 buffer 2 is 25 mm, the vibration transmissibility is large for heavy impact sounds with a frequency of 63 Hz, providing 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; and when the thickness of the buffer 2 is 12.5 mm, the vibration transmissibility is large for heavy impact sounds with a frequency of 63 Hz, providing 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] Another method for determining vibration-damping effectiveness is generally known: a frequency ratio of less than √2 is a resonance region, and a frequency ratio of √2 or more is a vibration-damping region. Thus, when the thickness t of the buffer 2 in the example was 12.5 mm, the frequency ratio for a heavy-impact sound with a frequency of 63 Hz was 0.91, which was less than √2 and was determined to be in the resonance region, but for a light-impact sound with a frequency of 125 Hz, the frequency ratio was 1.85, which was greater than √2 and was in the vibration-damping region, and it was determined that a vibration-damping effect was present. On the other hand, when the thickness t of the buffer 2 in comparative example 1 was 25 mm, the frequency ratio for a heavy-impact sound with a frequency of 63 Hz was 1.28, which was greater than √2 and was in the vibration-damping region, and for a light-impact sound with a frequency of 125 Hz, the frequency ratio was 2.55, which was greater than √2 and was in the vibration-damping region, indicating a vibration-damping effect.

[0043] From the results of the vibration-damping effect indicated by the vibration transmissibility and the vibration-damping effect amount, and the results of determining whether the frequency ratio is in the resonance region of less than √2 or the vibration-damping region of √2 or more, it was shown that only when the thickness t of the buffer 2 of the example is 12.5 mm, no vibration-damping effect can be expected in the resonance region for heavy-duty impact noise with a frequency of 63 Hz, but the buffer is in the vibration-damping region and has a vibration-damping effect for light-duty impact noise with a frequency of 125 Hz or more. The same effect as in the example can be expected for thicknesses of 10 to 15 mm, preferably 11 to 13 mm, and more preferably 12 to 12.5 mm, which are within ±2.5 mm of the thickness t of 12.5 mm.

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

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

Claims

1. A floating floor vibration-proofing material that is disposed on a floor slab and includes a plate-shaped buffer body that contacts the underside of the holding concrete, and a plate-shaped vibration insulator that contacts the side of the holding concrete, The buffer body and the vibration insulator are made of the same material and are arranged in contact with each other, The vibration-proof material for floating floors is It is made of a single type of polyolefin resin foam, has a thickness of 10 to 15 mm, and is in the form of a plate with a dynamic spring constant of 9 x 10 ７ ~18 x 10 ７ N / (m ２ ・m) A vibration-damping material for a floating floor.

2. 2. The vibration-damping material for a floating floor according to claim 1, wherein the polyolefin-based resin foam is a high-density polyethylene resin foam or a polypropylene resin foam.

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