JP6430171B2 - Anti-vibration material for floating floor structures - Google Patents

Description

  The present invention relates to a vibration isolator for a floating floor structure disposed between a structure and a floor.

  After placing a vibration isolator on the floor slab, placing the ready-mixed concrete on this anti-vibration material, the floating floor structure made by the wet floatation method that forms the concrete floorboard is the sound insulation of the floor in the building It is used to improve the performance (see, for example, Patent Document 1). The vibration isolator disclosed in Patent Document 1 uses a shock absorber made of a plate-like polystyrene foam as a mold, and supports the load at the time of placing the ready-mixed concrete with the shock absorber. After the ready-mixed concrete is hardened to become a floor board, the vibration isolator is attached to the floor board including the load of the floor board itself by an elastic body made of rubber that is inserted in holes formed in the shock absorber and dispersed. Such a load is mainly supported.

JP 2006-37503 A

  Since the buffer occupies a large area in the vibration isolator, it is necessary to prevent vibration from being transmitted through the buffer. Therefore, as in Patent Document 1, after a polystyrene foam is foam-molded at a high expansion ratio, a 400-mm-thickness material is pressurized and compressed to 20 mm, and the pressure is released to restore the thickness to 160 mm. By performing crushing, the spring property is lost and the dynamic spring constant is lowered. As described above, the polystyrene foam has high spring property and a sufficient sound insulation effect cannot be obtained if the raw material is foam-molded.

  That is, the present invention has been proposed in order to suitably solve these problems related to the prior art, and an object of the present invention is to provide a vibration isolator for a floating floor structure having an excellent sound insulation effect.

In order to overcome the above-mentioned problems and achieve the intended purpose, the vibration isolator for floating floor structure of the invention according to claim 1 of the present application,
A support body that is disposed on the structure so as to be spaced apart from each other and supports the load of the floor body that is placed on the structure body and the load applied to the floor body, and the space between the support bodies is filled. In the anti-vibration material for floating floor structure, which is disposed on the structure body and is composed of a buffer body that supports the load of the concrete material forming the floor body by curing,
The support is composed of a polyurethane foam having a hardness capable of supporting the load, and the buffer is composed of a flexible polyurethane foam having an open cell structure ,
The buffer body is softer than the support body in the measured value based on JIS K6400-2D method when a specimen having a thickness of 25 mm is compressed 5 mm from the original thickness, and the thickness of the concrete material is reduced. The dynamic spring constant is set to 11.0 × 10 ⁶ N / m ³ or less under the condition that the load corresponding to the corresponding concrete material is supported and the hardness according to the thickness of the concrete material is satisfied. is set up,
Furthermore the buffer body, its density lower than the support, and the Moto set in the range of ^{20kg / m 3 ~60kg / m 3} , the dynamic spring constant is ^{0.4 × 10 6 N / m 3} ~ The gist is that it is in the range of 11.0 × 10 ⁶ N / m ³ .
According to the first aspect of the present invention, by using a flexible polyurethane foam having an open cell structure as a buffer, a concrete material can be used without adjusting the physical properties by changing the cell structure by complicated physical processing such as crushing. It is possible to achieve both the hardness capable of supporting the load of 2 and the setting of the dynamic spring constant low under this hardness condition. That is, the buffer can appropriately support the load of the concrete material until the concrete material is placed and solidified as a floor body. In addition, the buffer body is set to be softer than the support body in the measurement value based on the JIS K6400-2D method when the hardness of the test body having a thickness of 25 mm is compressed from the original thickness by 5 mm. It does not interfere with the anti-vibration action of the body. And since the dynamic spring constant is low, a buffer can suppress that a vibration is transmitted between a structure and a floor body via this buffer. In addition, the flexible polyurethane foam that forms the buffer does not need to be set at a low density in order to achieve a low dynamic spring constant, and does not interfere with the vibration-proofing action of the support and does not have a low density. It can be set and can be adjusted without difficulty to a hardness that can support the load of the concrete material.

In the invention according to claim 2, wherein the support is the density of a high density polyurethane foam of ether in the range of ^{100kg / m 3 ~800kg / m 3} , the dynamic spring constant is 15 × ¹⁰ 6 N / The gist is in the range of m ^{3 to} 500 × 10 ⁶ N / m ³ .
According to the invention which concerns on Claim 2 , the vibration-proof effect by this support body can be improved by using a high-density polyurethane foam as a support body. Moreover, water resistance can be improved by using an ether type as a polyurethane foam which makes a support body.

The gist of the invention according to claim 3 is that the buffer body is formed so that one of surfaces facing the structure body and the floor body has an uneven shape.
According to the invention of claim 3 , since the contact area between the buffer and the structure or the floor can be reduced, it is possible to suppress vibration from being transmitted between the structure and the floor via the buffer. can do. In addition, the hardness of the buffer body can be easily adjusted by the uneven shape.

  According to the vibration isolator for floating floor structure according to the present invention, it is easy to use at the time of constructing a floor body, and the sound insulation effect can be improved.

It is a perspective view of the vibration isolator for floating floor structures which concerns on the suitable Example of this invention. It is explanatory drawing of the floating floor structure using the vibration isolator for floating floor structures which concerns on an Example.

  Next, preferred embodiments of the vibration isolator for floating floor structure according to the present invention will be described below with reference to the accompanying drawings. In the following description, the vibration isolator for floating floor structure is simply referred to as a vibration isolator.

  As shown in FIG. 2, the floating floor structure includes a floor structure 22 (structure) such as a concrete slab that constitutes a building frame, a vibration isolator 10 placed on the floor structure 22, and the anti-vibration material. The floor 20 is supported by the vibration member 10 so as to overlap the upper side of the floor structure 22. The floating floor structure is supported by the vibration isolator 10 in a state where the floor body 20 is separated from the floor structure 22, and the floor structure 22 is sandwiched between the floor structure 22 and the floor body 20. The vibration is prevented from being propagated between the floor 22 and the floor 20. Here, in the floating floor structure, after the vibration isolator 10 is disposed on the floor structure 22, the concrete floor body 20 is made by placing ready-mixed concrete (concrete material) on the vibration isolator 10. It is made by the wet floating floor method. That is, the anti-vibration material 10 defines a bottom surface of the floor body 20 when placing the ready-mixed concrete in the construction process, and also serves as a formwork that supports the ready-mixed concrete until it becomes the floor body 20. It is functioning. It should be noted that a functional material such as a synthetic resin sheet 24 having a waterproof property such as polystyrene having a thickness of about 0.1 mm and a plastic cardboard 26 having a thickness of about 5 mm is interposed between the vibration isolator 10 and the floor 20. You may lay it on. As in the embodiment, the synthetic resin sheet 24 is laid on the vibration isolator 10 and the plastic corrugated cardboard 26 is laid on the synthetic resin sheet 24 so that the ready-mixed concrete forming the floor body 20 is placed. The workability at the time can be improved.

The vibration isolator 10 is disposed on the floor structure 22 so as to be spaced apart from each other, and supports a plurality of supports 14 that support the load of the floor 20 and the load applied to the floor 20 together. It is basically composed of a buffer body 12 disposed on the floor structure 22 so as to fill the space between the bodies 14 and supporting the load of the ready-mixed concrete forming the floor body 20. The anti-vibration material 10 is spread between the floor structure 22 and the floor body 20, and the thickness is set according to the required performance and the like, and is often in the range of 25 mm to 50 mm. In addition, the thickness of the support body 14 and the thickness of the buffer body 12 are the same. In the vibration isolator 10, the arrangement and the number of the supports 14 are set according to the load and the load that can be supported by one support 14, and the natural frequency (dynamic frequency) is used to support the load. The area occupied by the support 14 that makes it difficult to reduce the target spring constant) is made as small as possible. The vibration isolator 10 is set so that a plurality of supports 14 are distributed on the floor structure 22 and 4 to 16 supports 14 are located per 1 m ^{2 of the} floor 20. . Further, the vibration isolator 10 has adjacent support bodies 14 arranged in a square shape, and a plurality of support bodies 14 are arranged in a matrix, and the intervals between the support bodies 14 that are vertically adjacent to each other are the same. Are set so that the intervals between the adjacent supports 14 are the same. Here, the anti-vibration material 10 is formed with a hole 16 penetrating in the thickness direction in the plate-like buffer body 12 according to the outer shape of the support body 14, and the support body 14 is fitted into the hole portion 16 to support the vibration-proof material 10. The body 14 is positioned in the horizontal direction.

The support 14 is a block-like product made of polyurethane foam, and can adopt an appropriate shape such as a cylinder or a prism. Support 14, the range of density of ^{100kg / m 3 ~800kg / m 3} , preferably a high density urethane foam is in the range of ^{150kg / m 3 ~750kg / m 3} , use of such high density urethane foam Thus, suitable vibration isolation performance can be obtained. When the density is lower than 100 kg / m ³ , it becomes difficult to provide the support 14 with sufficient hardness to support the load, and when the density is higher than 800 kg / m ³ , the support 14 becomes too hard and has a required prevention. It becomes difficult to obtain vibration performance. Support 14, in the density ^range, it is possible to hardness capable of supporting the loading weight in the range of ^{35kN / m 3 ~750kN / m 3} . And the support body 14 has a dynamic spring constant in the range of 15 × 10 ⁶ N / m ^{3 to} 500 × 10 ⁶ N / m ³ , and by using the high-density urethane foam in the above-described density range, The dynamic spring constant can be made relatively low while securing the hardness capable of supporting the spring.

  The density in this case is a value based on JIS K7222, and the hardness is a value measured in accordance with the JIS K6400-2D method when a 25 mm-thick specimen is compressed 5 mm from the original thickness. is there. In addition, the dynamic spring constant referred to in this case is obtained by testing a specimen having a thickness of 25 mm based on the measurement method defined in JIS A6321. The hysteresis loss rate in this case is a value measured by the JIS K6400-2D method.

The buffer body 12 is a plate-like object made of a flexible polyurethane foam, and is filled in a space other than the part where the support body 14 is disposed on the floor structure 22. The buffer body 12 according to the embodiment is configured by arranging panels formed in a plane rectangular shape side by side on the floor structure 22 and is made of flexible polyurethane foam. Therefore, the buffer body 12 is implemented according to the planar shape of the floor structure 22. It is also possible to cut easily on site. The shock absorber 12 is set so that its hardness is softer than that of the support 14 (hardness of the support 14> hardness of the shock absorber 12), and is set to be at least 0.18 N / cm ² or more. . That is, the buffer body 12 only needs to have a minimum hardness capable of supporting the ready-mixed concrete forming the floor body 20, and the ready-made concrete corresponding to the thickness of the ready-mixed concrete placed on the buffer body 12 is used. It is set to support the load per unit area of concrete. When 80 mm of ready-mixed concrete is placed on the buffer 12, the surface pressure applied to the buffer 12 is 180 kg / m ² (1765 N / m ² ), so the hardness of the buffer 12 is 0.18 N / If it is cm ^2, ready-mixed concrete can be supported. Similarly, when 150 mm of ready-mixed concrete is placed on the shock absorber 12, the surface pressure applied to the shock absorber 12 is 345 kg / m ² (3383 N / m ² ), and therefore the hardness of the shock absorber 12 is 0. If it is 34 N / cm ^2, ready-mixed concrete can be supported. In the floating floor structure, the floor body 20 is generally defined in a thickness range of 80 mm to 150 mm, that is, the hardness of the buffer body 12 is in a range of 0.18 N / cm ^{2 to} 0.34 N / cm ^2. It is set according to the thickness of the ready-mixed concrete that forms the floor body 20. Moreover, it is preferable that the buffer body 12 is excellent in the shape restoration property which is restored to the shape before compression when the compression is released, and the hysteresis loss rate is preferably 35% or less.

Also, the buffer member 12 is in the range of density of ^{20kg / m 3 ~60kg / m 3} , is preferably set in the range of ^{25kg / m 3 ~50kg / m 3} . When the density is lower than 20 kg / m ³ , it is difficult to provide the buffer body 12 with sufficient hardness to support the ready-mixed concrete, and when the density is higher than 60 kg / m ³ , the buffer body 12 becomes too hard and has a required motion. It becomes difficult to obtain a reasonable spring constant. Incidentally, the buffer member 12 is in the density range, it is possible to hardness in the range of 0.18N ^/ cm ² ~0.34N ^/ cm 2 in accordance with the thickness of the fresh concrete. The buffer 12 is set so that its dynamic spring constant is 11 × 10 ⁶ N / m ³ or less, and even if the buffer 12 has a hardness of 0.34 N / cm ² , 11 × 10 A low dynamic spring constant of ⁶ N / m ³ or less can be achieved, and the dynamic spring constant is set to 11 × 10 ⁶ N / m ³ by setting an appropriate hardness according to the thickness of the floor body 20. Can also be greatly reduced. That is, the shock absorber 12 can use flexible polyurethane foam and can have a dynamic spring constant in the range of 0.4 × 10 ⁶ N / m ^{3 to} 11 × 10 ⁶ N / m ³ to support the ready-mixed concrete. The dynamic spring constant can be lowered while securing the possible hardness.

  The buffer body 12 is obtained by cutting a raw material of a flexible polyurethane foam that is foamed and molded 2-4 times under atmospheric pressure into a required size, and is a soft material that maintains the cell structure and density during foam molding. Consists of polyurethane foam. In other words, the shock absorber 12 destroys a part of the cell membrane (framework) such as crushing and other foam breaking treatment that compresses and recovers the foam raw material obtained by the slab foaming method, The physical properties are not changed, and the foam-formed raw material can be used simply by cutting it out to the required dimensions. The cell structure of the buffer 12 has an open cell structure in which bubbles communicate with each other.

  The buffer body 12 is formed such that one of the surfaces facing the floor structure 22 and the floor body 20 has an uneven shape. In the buffer body 12 of the embodiment, the lower surface facing the floor structure 22 has an uneven shape, the lower end of the uneven portion of the uneven shape is in contact with the floor structure 22, and the uneven portion of the uneven shape is the floor structure. 22 to be spaced apart. The uneven shape of the buffer 12 is formed so that the convex portions and the concave portions are arranged in a regular or irregular pattern. In the buffer body 12 of the embodiment, the irregular pattern with a regular pattern is formed by profile processing. The concave-convex shape of the buffer body 12 of the embodiment is such that the convex portions are arranged at regular intervals in the horizontal and vertical directions, and the concave portions are provided between the four convex portions adjacent in the vertical and horizontal directions. The convex portions of the row and the row adjacent to the row in the vertical direction are shifted from each other. The convex portion is formed so as to taper toward the protruding end (downward) side. In addition, the concave portion is formed so as to become narrower toward the closed end (ceiling) side, and the concave portion in the embodiment opens in substantially the same shape as the outer shape of the convex portion. The uneven shape of the shock absorber 12 is formed according to the ready-mixed concrete load (the thickness of the floor body 20) supported by the shock absorber 12, and the ready-mixed concrete load set is the hardness of the shock absorber 12 with both sides flat. When the load is smaller than the load that can be supported, the hardness of the buffer body 12 is lowered by providing an uneven shape. In this way, the bumper 12 is adjusted to a hardness that can support the raw concrete load at a minimum by the uneven shape, such as the pitch of the unevenness in the uneven shape and the height from the bottom of the concave portion to the protruding end of the convex portion Depending on the setting, hardness can be adjusted with a relatively high degree of freedom. In addition, in the buffer body 12 of an Example, it sets so that the height of an uneven | corrugated shape may become 1/5 in the thickness of this buffer body 12 (refer FIG. 2). That is, if the load that can be supported by the hardness of the shock absorber 12 with both flat surfaces is substantially the same as the ready-mixed concrete load, the shock absorber 12 with flat surfaces is used without forming an uneven shape. Can do.

(Effects of Example)
Next, the effect | action of the vibration isolator 10 for floating floor structures which concerns on an Example is demonstrated. The anti-vibration material 10 uses a flexible polyurethane foam as the buffer body 12 to maintain the cell structure at the time of foam molding without adjusting the physical properties by changing the cell structure by complicated physical processing such as crushing. In this state, it is possible to achieve both the hardness capable of supporting the load of the ready-mixed concrete and the setting of the dynamic spring constant low under this hardness condition. That is, the buffer body 12 can appropriately support the load of the ready-mixed concrete until the ready-mixed concrete is placed and hardened as the floor body 20. Further, since the buffer body 12 is set to be softer than the support body 14, it does not disturb the vibration-proofing action of the support body 14. And since the buffer body 12 has a low dynamic spring constant, it can suppress that a vibration is transmitted between the structure 22 and the floor body 20 via this buffer body 12. FIG.

The flexible polyurethane foam that forms the buffer 12 does not require a high foaming ratio and a low density to achieve a low dynamic spring constant of 11 × 10 ⁶ N / m ³ or less. Hardness that can be supported and dynamic spring constant can be set in the range of 0.4 × 10 ⁶ N / m ^{3 to} 11 × 10 ⁶ N / m ³ , so just cut out the raw material to the required dimensions Can be used. That is, in order to obtain the buffer body 12, it is not necessary to perform an operation for changing the cell structure, the skeleton, or the like of the flexible polyurethane foam, such as crushing or other foam breaking treatment. Further, the buffer body 12 is set to a minimum hardness capable of supporting the ready-mixed concrete according to the thickness of the ready-mixed concrete, so that it does not interfere with the vibration-proofing action of the support 14.

The high-density polyurethane foam forming the support 14 has a density in a range capable of supporting a load and has a dynamic spring constant in the range of 15 × 10 ⁶ N / m ^{3 to} 500 × 10 ⁶ N / m ^3. . That is, the support 14 of the vibration isolator 10 can have a relatively low dynamic spring constant while ensuring the hardness capable of supporting the load. For this reason, by using a high-density polyurethane foam as the support 14, it is possible to improve the vibration isolation effect of the support 14. Moreover, water resistance can be improved by using an ether type as the polyurethane foam which comprises the support body 14. FIG.

  Since the vibration isolator 10 has an uneven shape on the lower surface of the buffer body 12, the contact area between the buffer body 12 and the structure body 22 or the floor body 20 can be reduced, and vibration is transmitted through the buffer body 12. It is possible to suppress the transmission between the floor structure 22 and the floor body 20. Moreover, the buffer body 12 can control hardness by forming an unevenness | corrugation, and can be easily adjusted to appropriate hardness according to the thickness of ready-mixed concrete. Accordingly, propagation of vibrations through the buffer body 12 can be more suitably prevented by using a flexible polyurethane foam having a smaller dynamic spring constant. Thus, the buffer body 12 can adjust the hardness without changing the cell structure of the flexible polyurethane foam, the blending of the cells, and the like by providing the uneven shape.

  Since the vibration isolator 10 has a configuration in which the support body 14 is fitted into the hole 16 provided in the shock absorber 12, the support body 14 is positioned in the horizontal direction by the shock absorber 12. It can be installed and the workability at the time of construction of the floor 20 is good.

(Vibration test)
Tests for natural frequencies were performed on the vibration isolator 10 of Experimental Examples 1 to 6 and Comparative Examples 1 and 2 corresponding to the above-described Examples. The conditions of the support 14 and the buffer 12 in Experimental Examples 1 to 6 and Comparative Examples 1 and 2 are as shown in Table 1. In the vibration isolator 10 of the experimental example and the comparative example, a prismatic support 14 is fitted into a hole 16 that is formed in the buffer 12 so as to penetrate in the thickness direction in accordance with the outer shape of the support 14. Here, Experimental Examples 1 to 6 and Comparative Examples 1 and 2 are spaced apart so that the four supports 14 are spaced by 250 mm in the vertical direction and 500 mm in the horizontal direction and positioned at the corners of the rectangle. The support bodies 14 arranged in the horizontal direction are spaced from the short sides of the buffer bodies 12 extending in the vertical direction by a distance of 250 mm, and the support bodies 14 arranged in the vertical direction from the long sides of the buffer bodies 12 extending in the horizontal direction. They are arranged with an interval of 125 mm. The shock absorbers 12 of Experimental Examples 1 and 2 have an uneven bottom surface, and the shock absorbers 12 of Experimental Examples 3 to 6 and Comparative Examples 1 and 2 are flat. In addition, the uneven | corrugated shape of the buffer body 12 in Experimental example 1 and 2 is 1/5 in the uneven | corrugated shape height in the thickness of the buffer body 12. FIG. Further, in the uneven shape, the pitch is set to 30 mm, the interval between the recesses and recesses adjacent in the vertical direction and the horizontal direction, and the interval between the protrusions adjacent to each other in the vertical direction and the horizontal direction is 30 mm. . Experimental Examples 1 to 6 and Comparative Examples 1 and 2 use a support 14 made of a high-density polyurethane foam having the physical properties shown in Table 1 and a buffer 12 made of a flexible polyurethane foam having the physical properties shown in Table 1. ing. In addition, the support body 14 of Experimental Examples 1, 2, 5 and 6 and Comparative Examples 1 and 2 uses BF-300 manufactured by Inoac Corporation, and the support bodies 14 of Examples 3 and 4 are manufactured by Inoac Corporation. BF-400 was used. The buffer body 12 of Experimental Examples 1 and 2 uses ECA-P4 manufactured by Inoac Corporation, and the buffer body 12 of Experimental Examples 3 and 4 uses ECA manufactured by Inoac Corporation, and the buffer bodies of Experimental Examples 5-6. 12 uses LR-40M manufactured by Inoac Corporation, the buffer body 12 of Comparative Example 1 uses EFD manufactured by Inoac Corporation, and the buffer body 12 of Comparative Example 2 uses EPM-70 manufactured by Inoac Corporation. Used.

In the vibration test, a concrete block (length 500 mm × width 1000 mm × thickness 10 mm: weight 115 kg (equivalent to 230 kg / m ² )) matched to the planar shape of the test specimen was used in Experimental Examples 1-7 and Comparative Examples 1 and 2. Placed on the test body, for Experimental Examples 1, 2, 5, 6 and Comparative Examples 1 and 2, two 40 kg iron plates were placed on this concrete block, and the loading load was 195 kg (390 kg / m was set to ² equivalent). in contrast, the experimental examples 3 and 4, by placing an iron plate so as to 230kg on concrete block, setting the live load to 345 kg (690 kg / ^{m 2} or equivalent) Then, the vibration test was performed for each of the example and the comparative example to obtain the natural frequency, which was determined based on the measurement method defined in JIS A6321. Without performing ring or the like, and those determined from the measured displacement transmissibility natural vibration as the vibration source. Table 1 shows the results.

As shown in Table 1, according to Experimental Examples 1 to 6, which are examples of the present invention, the natural frequency can be suppressed to 18 Hz or less. The range of the natural frequency is lower than that of Comparative Example 2 using the buffer 12 having a dynamic spring constant of 11.0 × 10 ⁶ N / m ³ or more, and it can be confirmed that vibration is difficult to transmit. In Comparative Example 1 in which the hardness of the shock absorber 12 is set to 0.15 N / cm ² , the shock absorber 12 is greatly deformed under the load of the concrete block and the iron plate, and the value of the natural frequency is unknown. . In comparison with Comparative Example 1 and Comparative Example 2 in Experimental Example 1-6, the density range of the buffer body 12 it can be seen that it is preferable to ^{20kg / m 3 ~60kg / m 3} .

(Impact sound test)
With respect to the vibration isolator 10 of Experimental Examples 7 and 8, the floor impact sound level reduction amount was measured in the laboratory, and the cutoff performance was tested. Here, the floor impact sound level reduction amount is measured according to JIS A1440-1, “Measurement method of floor impact sound level reduction amount of floor finishing structure on concrete floor in laboratory—Part 1: Method by standard lightweight impact source” and This was performed based on JIS A1440-2 “Measurement method of floor impact sound level reduction of floor finishing structure on concrete floor in laboratory—Part 2: Method using standard weight impact source”. The vibration isolator 10 of Experimental Examples 7 and 8 is formed with a support 14 made of high-density polyurethane foam and a buffer 12 made of soft polyurethane foam with the dimensions shown in Table 2, and the support 14 adjacent in the vertical direction is 450 mm. Six support members 14 were arranged at intervals, and eight support members 14 were arranged in the lateral direction so that the support members 14 adjacent in the horizontal direction with respect to the six support members 14 had an interval of 448 mm. Note that the column located at the end of the support 14 in the horizontal direction is 177 mm away from the short side of the buffer 12 extending in the vertical direction, and the row located at the end of the support 14 in the vertical direction is horizontal. 177.5 mm away from the long side of the buffer 12 extending in the direction. Moreover, as for the buffer body 12 of Experimental example 7 and 8, the lower surface is uneven | corrugated shape. In addition, the uneven | corrugated shape of the buffer body 12 in Experimental example 7 and 8 is 1/5 in the uneven | corrugated shape height in the thickness of the buffer body 12. FIG. Further, in the concavo-convex shape, the pitch is set to 30 mm, and the interval between the concave portions and the concave portions adjacent in the vertical direction and the horizontal direction, and the interval between the convex portions and the convex portions adjacent in the vertical direction and the horizontal direction are 30 mm, respectively. As the support 14 of Experimental Examples 7 and 8, BF-300 manufactured by Inoac Corporation was used. As the buffer body 12 of Experimental Examples 8 and 9, ECA manufactured by Inoac Corporation was used. And the vibration isolator 10 of Experimental example 7 and 8 was spread | laid on the concrete standard floor (thickness 200mm) by the wall type structure prescribed | regulated to JIS A1440-1 appendix JC and JIS A1440-2 appendix C. Later, a ready-made reinforced concrete panel was placed on the vibration isolator 10.

The amount of floor impact sound level reduction by a light impact source is measured in the state where the floor impact sound level measured from the surface of a standard concrete floor, the reverberation time of the sound receiving room, and the vibration isolator 10 of Experimental Examples 7 and 8 are applied. The normalized standard sound level was obtained from the floor impact sound level and the reverberation time of the receiving room, and the floor impact sound level reduction amount ΔL was calculated by the following equation.
ΔL = L _n0 −L _n
L _n = L _i +10 log (A / A ₀ )
L _n0 : Normalized floor impact sound level (dB) on the surface of a standard concrete floor
L _n : Normalized floor impact sound level (dB) in a state where the vibration isolator 10 is applied
A: Equivalent sound absorption area of the laboratory (m ² )
A ₀ : standard equivalent sound absorption area (10 m ² )
T: Laboratory reverberation time (seconds)
V: Laboratory volume (m ³ )
The target frequency was set to the center frequency 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 Hz of the 1/3 octave band. From these results, the synthesized value of the octave band of 125, 250, 500, 1000, 2000 Hz was obtained. The results are shown in Table 3.

The amount of floor impact sound level reduction by the heavy impact source is the floor impact sound level (L _{i, Fmax, s} ) of the standard concrete floor and the floor impact in the state where the vibration isolator 10 of Experimental Examples 7 and 8 is applied. The sound level (L _{i, Fmax, r} ) was measured, and the floor impact sound level reduction amount ΔL _H was calculated by the following equation.
ΔL _H = L _{i, Fmax, s} −L _{i, Fmax, r}
The target frequency is 1/3 octave band center frequency 50,63,80,100,125,160,200,250,315,400,500,630Hz, and from those results, octave of 63,125,250,500Hz The composite value of the band was determined. The results are shown in Table 4.

  As shown in Tables 3 and 4, in Experimental Examples 7 and 8, which are examples of the present invention, it was confirmed that an effect of satisfactorily reducing floor impact sound was obtained. Moreover, it can be confirmed that Experimental Example 7 has an excellent reduction effect of lowering the floor impact sound level, which is the target value, by two ranks (1 rank down by 5 dB down).

(Example of change)
The present invention is not limited to the configuration described above, and can be modified as follows, for example.
(1) The concrete material in the present invention is a so-called concrete material in a broad sense mainly composed of cement, water, and aggregate. Therefore, in the embodiment, an example in which ready-mixed concrete (mainly sand and gravel is used as an aggregate) is used as the concrete material, but is not limited to ready-mixed concrete. For example, raw mortar (mainly sand is an aggregate) can be used as the concrete material. In addition, since raw mortar has light specific gravity compared with raw concrete, it can support a load appropriately with the vibration isolator which concerns on this invention.
(2) In the embodiment, the example in which the supports are arranged in a matrix is given. However, the supports may be arranged so as to support the load, and may be arranged irregularly, for example.
(3) The anti-vibration material for floating floor structure of the present invention can be adopted as long as it is a structure disposed between the structure and the floor. For example, the foundation of a building such as a building or a housing complex, an entrance, It can also be applied to subway and pit type parking lots.
(4) In the example, the example in which the concavo-convex shape is provided on the body by profile processing is given, but the method for forming the concavo-convex shape is not particularly limited. You may form uneven | corrugated shape in both surfaces of the surface facing a floor body in a buffer, and the surface facing a floor structure. Moreover, you may use a flat buffer body, without forming uneven | corrugated shape in a buffer body.
(5) In the examples, a quadrangular prism-shaped support is described as an example, but the shape of the support is not particularly limited as long as it can support a load. For example, the bottom may be a circular or elliptical columnar support, and the bottom may be a prismatic support such as a triangle or pentagon.

(Appendix)
The present application includes the following technical ideas.
A plurality of supports (14) that support the load of the floor body (20) and the load applied to the floor body (20) and a space between the plurality of supports (14) are disposed. In the vibration isolator for floating floor structure constituted by the buffer body (12) that supports at least the load of the concrete material forming the floor body (20) by hardening,
The support (14) and the buffer (12) are made of polyurethane foam,
The support (14) has a density of 100 kg / m ³ or more and a hardness of 35 kN / m ³ or more.
The buffer (12) has a density and hardness lower than those of the support (14), and a dynamic spring constant measured based on JIS A6321 is 11.0 × 10 ⁶ N / m ³ or less. An anti-vibration material for floating floor structures, characterized by
According to this, since the density and hardness of the buffer are set lower than those of the support, the vibration isolating action of the support is not disturbed. And since the dynamic spring constant of a buffer is low, it can suppress that a vibration is transmitted through this buffer.

10 vibration isolator (vibration isolator for floating floor structure), 12 shock absorbers, 14 support bodies, 20 floor bodies,
22 Floor structure (structure)

Claims (3)

A support body that is disposed on the structure so as to be spaced apart from each other and supports the load of the floor body that is placed on the structure body and the load applied to the floor body, and the space between the support bodies is filled. In the anti-vibration material for floating floor structure, which is disposed on the structure body and is composed of a buffer body that supports the load of the concrete material forming the floor body by curing,
The support is composed of a polyurethane foam having a hardness capable of supporting the load, and the buffer is composed of a flexible polyurethane foam having an open cell structure ,
The buffer body is softer than the support body in the measured value based on JIS K6400-2D method when a specimen having a thickness of 25 mm is compressed 5 mm from the original thickness, and the thickness of the concrete material is reduced. The dynamic spring constant is set to 11.0 × 10 ⁶ N / m ³ or less under the condition that the load corresponding to the corresponding concrete material is supported and the hardness according to the thickness of the concrete material is satisfied. is set up,
Furthermore the buffer body, its density lower than the support, and the Moto set in the range of ^{20kg / m 3 ~60kg / m 3} , the dynamic spring constant is ^{0.4 × 10 6 N / m 3} ~ An anti-vibration material for a floating floor structure characterized by being in the range of 11.0 × 10 ⁶ N / m ³ . Said support, the density of a high density polyurethane foam of ether in the range of ^{100kg / m 3 ~800kg / m 3} , the dynamic spring constant is ^{15 × 10 6 N / m 3} ~500 × 10 6 N / vibration-proof material for floating floor structure of claim 1 Symbol placement is in the range of m ^3. The buffer body, one face facing the structure and the floor body, vibration-proof material for floating floor structure of claim 1, wherein is formed so as to be uneven.

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