JP7319152B2 - cushioning material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cushioning material arranged under a floor slab, and more specifically to a cushioning material arranged between a floor slab and a beam that supports the floor slab from below vertically.

Conventionally, in buildings, cushioning materials such as thin felt and foamed polyethylene have been provided between beams and floor slabs. This cushioning material can prevent rubbing noise caused by contact between the beam and the floor slab, and can absorb unevenness between the beam and the back surface of the floor slab, but does not have the effect of reducing floor impact noise.

On the other hand, various elastic bodies such as rubber have been studied for a long time as countermeasures for reducing floor impact noise. In order to obtain the effect of reducing floor impact noise, elastic bodies such as rubbers have been studied mainly in terms of hardness and amount of deformation.

As such a cushioning material, in Patent Document 1, it is arranged between a floor base plate and a support structure member, and on one side or both sides, belt-shaped peaks and grooves are alternately formed in the long side direction. A sound deadening member is disclosed.

Japanese Patent Application Laid-Open No. 2005-16103 (published on January 20, 2005)

However, the soundproof member disclosed in Patent Document 1 has a problem that the effect of reducing floor impact noise is low because the heights of the peaks formed in three rows are substantially the same.

One aspect of the present invention has been made in view of the above problems, and an object thereof is to realize a cushioning material that is more effective in reducing floor impact noise than conventional products.

In order to solve the above-described problems, a cushioning material according to an aspect of the present invention is a cushioning material arranged to support a floor slab from below in a vertical direction, the cushioning material comprising a base portion extending along the floor slab; A first convex portion protruding from an opposing surface of the base facing the floor slab and extending along the longitudinal direction of the base, and two second protrusions protruding from the opposing surface and extending along the longitudinal direction of the base. and a convex portion are integrally extruded, the first convex portion is formed between the two second convex portions, and the height of the first convex portion is equal to the height of the two It is higher than the height of the second protrusion, and the hardness of the first protrusion is less than the hardness of the two second protrusions.

According to the above configuration, the height of the first protrusion formed between the two second protrusions is higher than the height of the two second protrusions. Therefore, in a state where the floor slab is placed on the upper side of the cushioning material, the first convex portion is vertically compressed to a greater extent than the second convex portion, and is elastically deformed to a greater extent. In this state, the first convex portion is securely brought into close contact with the floor slab by the repulsive force caused by the reaction to the elastic deformation.

Therefore, when an impact force is applied to the floor slab, the impact is reliably transmitted to the first convex portion. When the floor slab is placed on the first convex portion, the first convex portion is not hard enough to support the floor slab by itself, so it is flexibly compressed and deformed, and the floor slab is brought into close contact with the second convex portion. Since the second convex portion is hard enough to support the floor slab without undergoing significant compression deformation, the floor slab does not move vertically downward any further. Therefore, the floor slab is in close contact with both the first convex portion, which is greatly compressed and deformed, and the second convex portion, which is hardly deformed. It will be impacted adjacent to the lengthwise direction. As described above, the structure is such that members having different impact reduction effects are reliably combined to exhibit their effects.

In addition, the first protrusion may be elastically deformed by following the magnitude and direction of the impact force more than the second protrusion, and the impact force different from the second protrusion that has no or a small amount of deformation due to compression It exhibits the effect of reducing As a result, floor impact noise can be effectively reduced.

In addition, according to the above configuration, when the floor slab is placed on the upper side of the cushioning material, the first protrusion produces a greater amount of compression than the second protrusion. Compared to the case where the height of the second protrusion is the same, the first protrusion can be brought into contact with the floor slab more reliably. The first projection is formed between two second projections of the same height, and the second projection is made of a material so hard that it hardly deforms even if it receives an impact from above the floor slab. As a result, the weight of the floor slab or a load greater than the weight of the floor slab does not compress and deform the first projection in a biased manner. Therefore, it is possible to realize a cushioning material having an enhanced function as a supporting member.

When there is a beam that supports the floor slab from the vertical lower side, the cushioning material of the present invention is installed between the beam and the floor slab, and the base of the cushioning material extends along the extension direction of the beam. .

Further, in the cushioning material according to one aspect of the present invention, the first protrusion is made of a foam rubber material, and the two second protrusions are made of a hard rubber material. According to the above configuration, when the floor slab is placed on the cushioning material, the first convex portion made of foamed rubber material is elastically deformed greatly, and the floor slab can be securely brought into close contact with the second convex portion. can. As a result, the effect of reducing floor impact noise is higher than when the first protrusion is not made of foamed rubber.

Further, in the cushioning material according to one aspect of the present invention, the rebound resilience of the two second projections is 15% or less. According to the above configuration, while maintaining a high floor impact noise reduction effect, the floor slab support performance by the two second protrusions is further enhanced.

Further, in the cushioning material according to one aspect of the present invention, the first protrusion has a specific gravity of 0.8 or less. According to the above configuration, since the first protrusion made of the foamed rubber material is sufficiently soft, the impact absorption capability due to the elastic action of the first protrusion is good while maintaining a high floor impact noise reduction effect.

Further, in the cushioning material according to one aspect of the present invention, the first protrusion is formed of NBR (acrylonitrile butadiene rubber) or EPDM (ethylene-propylene-diene copolymer rubber), and the two second protrusions The convex portion is made of NBR or EPDM. According to the above configuration, a high effect of reducing floor impact noise is exhibited.

Further, in the cushioning material according to an aspect of the present invention, the first convex portion has a cross-sectional shape that is perpendicular to the extending direction thereof, and the cross-sectional shape of the cross section becomes wider from the tip of the first convex portion toward the root. In addition, the side surface of the first convex portion in the extending direction is inclined. According to the above configuration, the area of the boundary surface between the first convex portion and the base portion is larger than, for example, when the side surface of the first convex portion in the extending direction is not inclined. Therefore, the anchoring effect is further enhanced, and peeling of the first protrusion from the base is further suppressed.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, there is an effect that it is possible to realize a cushioning material that is more effective in reducing floor impact noise than conventional products.

It is a longitudinal section showing the structure of the floor structure concerning one embodiment of the present invention. (a) is a longitudinal sectional view showing the structure of an example of a cushioning material according to an embodiment of the present invention, (b) is a longitudinal sectional view showing the structure of another example of the cushioning material, (c) is a longitudinal sectional view showing the structure of still another example of the cushioning material, and (d) is a longitudinal sectional view showing the structure of still another example of the cushioning material. 3 is a perspective view of the cushioning material shown in FIG. 2(c); FIG. It is a longitudinal cross-sectional view which shows a mode when the cushioning material shown to (c) of FIG. 2 is arrange|positioned between a beam and a floor slab.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. In this specification, the upper side of the paper surface of the drawings is referred to as "upper", and the lower side of the paper surface is referred to as "lower".

[Floor structure]
As shown in FIG. 1, in a floor structure 1 according to an embodiment of the present invention, cushioning materials 4a (as well as cushioning materials 4b, 4c, and 4d, which will be described later) are arranged between floor slabs 2 and beams 3. It has a structure that As a building having this floor structure 1, for example, a building constructed by laying concrete floor slabs 2 over beams 3 can be exemplified.

The floor slab 2 forms the foundation of the floor structure 1 . Selected from the group consisting of mineral floor slabs, wood floor panels and composite floor panels. Specifically, inorganic floor slabs made of ALC floor slabs, PC floor slabs, hollow extruded cement floor slabs, etc., wooden floor panels made by combining wood materials, plywood, particle boards, wooden materials such as joists, concrete gypsum boards, ALC, It can be selected from the group consisting of inorganic materials such as hollow extruded cement boards, metal materials such as steel plates and steel materials, and composite floor panels in which various sound absorbing materials are arbitrarily combined. The beam 3 supports the floor slab 2 vertically from below.

[Buffer material]
The cushioning material 4a is formed of a viscoelastic body and arranged between the floor slab 2 and the beam 3 to reduce floor impact noise. As a result, the cushioning material 4 a reduces the impact force when the impact is applied to the floor slab 2 , and suppresses the vibration transmission of the impact force to the beam 3 .

The cushioning material 4a is formed by integrally extruding a first convex portion 6a and a second convex portion 5, which will be described later.

Specifically, the cushioning material 4a has a structure in which structures with the same cross-sectional shape are continuous in the longitudinal direction (direction from the front side to the back side) (see FIG. 3), and is manufactured by continuous extrusion molding. be done. That is, the cushioning material 4a is manufactured by simultaneous (integral) extrusion molding of the first convex portion 6a, the second convex portion 5 and the base portion 7 (the first convex portion 6a, the second convex portion 5 and the base portion 7 are different). Even if it is raw material, it is manufactured by co-extrusion molding). More specifically, the cushioning material 4a is integrated with a large pressure when ejected from the mouthpiece, and no adhesive is used.

The cushioning material 4a has a second projection 5, a first projection 6a, and a base 7, like the cross-sectional shape shown in FIG. The second protrusions 5 are provided at both ends of a flat base 7, and the first protrusions 6a are provided therebetween. The cross section shown in FIG. 1 is a cross section perpendicular to the extending direction of the cushioning material 4a.

The base portion 7 extends along the extending direction of the beams 3 of the cushioning material 4a (the direction from the front side to the back side of the drawing), and the bottom surface of the base portion 7 contacts the tip surface 31 of the beams 3 . Also, the base portion 7 is made of a hard rubber material which will be described later.

The first convex portion 6a protrudes from the facing surface of the base portion 7 facing the floor slab 2 and extends along the longitudinal direction of the base portion 7 (the depth direction with respect to the paper surface of FIG. 2). The tip surface of 6a is in contact with the lower surface of floor slab 2. As shown in FIG.

The first convex portion 6a is made of a foamed rubber material (sponge material), and examples of its constituent material include acrylonitrile butadiene rubber (NBR) and ethylene-propylene-diene copolymer rubber (EPDM). However, the constituent material of the first convex portion 6a is not limited to this. For example, the constituent material of the first convex portion 6a includes natural rubber (NR), chloroprene rubber (CR), butyl rubber, recycled rubber, ethylene-propylene copolymer, ethylene-propylene multi-component copolymer, polyisobutylene, and partially crosslinked rubber. At least one polymer component selected from the group consisting of butyl rubber and thermoplastic elastomers can be exemplified.

Thus, by forming the first protrusions 6a from a sponge-like foam rubber material, the first protrusions 6a are more likely to be elastically deformed than the second protrusions 5 are formed from a solid hard rubber material. Therefore, the effect of reducing the floor impact noise is higher than that in which the first convex portion 6a is not made of the foamed rubber material. The hardness of the first convex portion 6 a should be less than the hardness of the two second convex portions 5 , and the first convex portion 6 a is preferably softer than the second convex portion 5 .

Here, the terms hard and soft refer to the magnitude of deformation when compressed with the same force. It is said to be low and soft. This is due to the difference in hardness of the material, the difference in the structure including the shape, for example, the difference between hollow and solid shapes, and whether the material is sponge-like foam or solid. The amount of deformation during compression can be changed by a difference or a combination thereof.

Further, the specific gravity of the first convex portion 6a is preferably 0.8 or less, more preferably around 0.7. As a result, the first protrusions 6a made of foamed rubber material are sufficiently soft, and the elastic action of the first protrusions 6a has a good impact absorbing ability.

The second convex portion 5 protrudes from the surface of the base portion 7 facing the floor slab 2 and extends along the longitudinal direction of the base portion 7 . are in contact with The cushioning material 4a of this embodiment has two second projections 5. As shown in FIG. A groove is formed between the two second protrusions 5 . The first protrusion 6 a is formed in a groove between two second protrusions 5 . Although the base portion 7 and the second convex portion 5 are integrally made of the same material, they can be molded separately and combined.

The second convex portion 5 is made of a hard rubber material, and NBR or EPDM can be exemplified as its constituent material, but the material is not limited to this. For example, the constituent material of the second convex portion 5 includes natural rubber (NR), chloroprene rubber (CR), butyl rubber, recycled rubber, ethylene-propylene copolymer, ethylene-propylene multi-component copolymer, polyisobutylene, partially cross-linked At least one polymer component selected from the group consisting of butyl rubber and thermoplastic elastomers can be exemplified.

When the floor slab 2 is placed on the cushioning material 4a, the first protrusions 6a are compressed more than the second protrusions 5. For example, the first protrusions 6a and the second protrusions 5 are compressed. The floor slab 2 can be reliably supported by the first projections 6a as compared with the case of the same height. If the first convex portion 6a and the second convex portion 5 were of the same height, the floor slab 2 would be supported by the second convex portion 5, and the first convex portion 6a would only be in contact with the floor slab 2 and would be in close contact with the floor slab 2. do not. In addition, it is conceivable that the floor slab 2 may be separated from the floor slab 2 depending on molding variations, and there is a concern that it may not be supported reliably.

If the first convex portion 6a and the base portion 7 are made of different materials, for example, if the first convex portion 6a is EPDM and the hard rubber is NBR, compatibility is poor and good adhesion (welding) cannot be expected. In this case, since they are likely to separate from each other, it has not been assumed by those skilled in the art to manufacture a product by integrally molding a foam rubber material and a hard rubber material. In this respect, the cushioning material 4a is formed so that the first convex portion 6a made of foamed rubber material made of EPDM and the base portion 7 made of hard rubber made of NBR have a large boundary surface area. 6a is formed, and since the first projection 6a and the base 7 are integrally extruded at the same time, they are firmly integrated by the pressure in the mouthpiece of the extruder and are difficult to separate from each other.

Moreover, it is preferable that the impact resilience of the two second projections 5 is 15% or less. Thereby, the impact reduction effect of the floor slab 2 by the two second projections 5 is further enhanced. Here, the modulus of rebound resilience is an index representing the energy absorbed by a material when an object collides with it. The modulus of rebound resilience is the ratio of energy possessed by an object at the time of impact and rebound when a falling object of a given mass and height collides with the test piece. Note that the rebound resilience can be measured under the standard conditions specified in JIS-K-6255.

Next, FIG. 2(a) is a longitudinal sectional view showing the structure of the cushioning material 4a described above. As shown in the figure, the height h2 of the first protrusion 6a is higher than the height h3 of the second protrusion 5. As shown in FIG. The second protrusions 5 protrude from both ends of the base 7 and both have the same height. Here, the projection length h1 of the first projection 6a from the second projection 5 is approximately 1/2 to 1/3 times h3.

Further, as shown in the figure, between the side surface of the first convex portion 6a extending in the extending direction of the beam 3 and the surface of the second convex portion 5 facing the side surface of the first convex portion 6a, a floor is provided. There is a gap S that can accommodate the volume of the first convex portion 6a pressed and compressed by the plate 2 .

A tip surface 9a of the first projection 6a of the cushioning material 4a is substantially planar. Further, the cross-sectional area of the first convex portion 6a in a cut view defined in a direction (horizontal direction) parallel to the tip surface 9a is substantially constant from the tip to the root of the first convex portion 6a. The side surface of the projection 6a in the extending direction is upright.

(Effect of cushioning material 4a)
In the cushioning material 4a described above, the height h2 of the first protrusion 6a formed between the two second protrusions 5 is higher than the height h3 of the two second protrusions 5. As shown in FIG. Therefore, when the floor slab 2 is placed on the upper side of the cushioning material 4a, the first projections 6a are more strongly compressed vertically downward than the second projections 5, and are elastically deformed to a greater extent. In this state, the first convex portion 6a is securely brought into close contact with the floor slab 2 by the repulsive force caused by the reaction to the elastic deformation.

Therefore, when an impact force is applied to the floor slab 2, the first convex portion 6a reliably transmits the impact force, and exerts a unique impact reduction effect. It is also conceivable that the impact force is effectively absorbed by elastically deforming according to the magnitude and direction of the impact force.

[Modification 1]
Next, based on (b) of FIG. 2, the structure of the cushioning material 4b of Modification 1 will be described. The tip surface 9a of the first convex portion 6b of the cushioning material 4b of this modification has a substantially planar shape like the cushioning material 4a. However, in the vicinity of the base of the first convex portion 6b of the cushioning material 4b of this modified example, the cross-sectional area of the first convex portion 6b in a cut view defined in a direction (horizontal direction) parallel to the tip surface 9a is The side surface 8a of the first protrusion 6b in the extending direction is inclined so as to widen from the top of the first protrusion 6b toward the root. That is, it expands toward the base of the cross-sectional shape shown in FIG. Also, the adhesive surface at the base of the first projection 6b extends substantially to fill the groove. As a result, the area of the bonding surface at the base of the first protrusion 6b is increased, so that when the first protrusion 6a and the base 7 are integrally extruded at the same time, the physical anchoring effect is enhanced, and the first protrusion is Detachment of the portion 6b from the base portion 7 is further suppressed.

[Modification 2]
Next, based on (c) of FIG. 2, the structure of the cushioning material 4c of Modification 2 will be described. As shown in the figure, the height h2 of the first projection 6c is higher than the height h3 of the two second projections 5. As shown in FIG. Here, the projection length h1 of the first projection 6c from the second projection 5 is about 1/2 to 1/3 times h3.

The tip surface 9b of the first projection 6c of the cushioning material 4c of this modification has a substantially curved surface shape. Further, in the vicinity of the base of the first convex portion 6c of the cushioning material 4c of this modified example, the cross-sectional area of the first convex portion 6c in a cut view defined in a direction parallel to the horizontal plane is above the first convex portion 6c. The side surface 8b of the first convex portion 6c in the extending direction is inclined so as to widen as it approaches the root. That is, it expands toward the base of the cross-sectional shape shown in FIG. Further, the adhesive surface at the base of the first convex portion 6c extends almost to the full extent of the groove, similar to the cushioning material 4b. As a result, as with the cushioning material 4b, the cushioning material 4c has a large adhesive surface area at the base of the first protrusion 6c. A physical anchoring effect is enhanced, and peeling of the first convex portion 6c from the base portion 7 is suppressed.

In addition, the first convex portion 6c has a constricted structure in which the middle part is narrower and narrower than the other parts. Therefore, with the floor slab 2 placed on the cushioning material 4c, the deflection of the first convex portion 6c can be sufficiently absorbed. Further, as a result, even if the first protrusion 6c is pressed or pulled, the force is not directly transmitted to the joint portion between the root of the first protrusion 6c and the base portion 7, and the first protrusion 6c is pulled from the base portion 7. Peeling can be suppressed.

[Modification 3]
Next, based on (d) of FIG. 2, the structure of the cushioning material 4d of Modification 3 will be described. The cushioning material 4d of this modified example has a structure in which both ends 8c of the base of the first convex portion 6c are inserted inside the second convex portion 5, respectively. The structure is different from that of material 4c. The cushioning material 4d having the structure as described above can further suppress peeling of the first convex portion 6c from the base portion 7. As shown in FIG.

Although not shown, each of the ends 8c of the root may have a shape that branches upward, downward, or vertically with respect to the horizontal direction. As a result, peeling of the first convex portion 6c from the base portion 7 can be suppressed more effectively than the cushioning material 4c of the second modification.

Also, the structure in which both ends 8c of the base of the first convex portion 6c are inserted inside the second convex portion 5 shown in the cushioning material 4d of Modification 3 can be applied to the cushioning material 4b of Modification 1. can be done.

Next, FIG. 3 shows a perspective view of the cushioning material 4c described above. As shown in the figure, the cushioning material 4c is a long product that extends from the front side toward the back side (the same applies to the cushioning materials 4a, 4b, and 4d). In this way, after the cushioning material 4c is manufactured in a long shape, it is cut to a required length for use. It should be noted that the cushioning material 4c may be finely cut and used.

Further, as shown in the figure, in the cushioning material 4c, a substantially semi-cylindrical first convex portion 6c extends from the front side toward the back side.

If the base portion 7 of the cushioning material 4c is made of NBR and the first convex portion 6c is made of EPDM, and these are formed into a long product by simultaneous (integral) extrusion molding, compatibility between the two materials is poor, and simultaneous extrusion and press molding are required. Although the first convex portion 6c and the base portion 7 are not adhered to each other by sulfur, a strong adhesion state is formed by the simultaneous (integral) extrusion molding as described above, and the adhesive surface at the base of the first convex portion 6c is substantially grooved. Due to the full expansion, peeling of the first convex portion 6c from the base portion 7 is suppressed. The second convex portion 5 is made of the same hard rubber as the base portion 7, and the base portion 7, the first convex portion 6c, and the second convex portion 5 are all extruded simultaneously (integrally).

Next, FIG. 4 shows a state in which the cushioning material 4c is arranged between the beam 3 and the floor slab 2. As shown in FIG. As shown in the figure, the first convex portion 6c is elastically deformed and compressed. It is accommodated in the gap S formed between the side surface extending in the direction and the surface of the second convex portion 5 facing the side surface of the first convex portion 6c. As a result, the deformed state in which the first convex portion 6c is compressed is kept constant.

(Performance test results)
Impact sound absorption performance (sound insulation performance) was measured according to JIS-A-1418-2, using a bung machine as the impact source and measuring heavy floor impact noise. In the floor structure 1 shown in FIG. 1, five locations on the floor slab 2 were vibrated, and the test was conducted at five receiving points.

The soundproofing member of the conventional product (see Patent Document 1) had poor impact sound absorption performance at a frequency of 63 Hz, and was rated as LH-70 due to this performance. improved to LH-65 grade (LH-65 grade or higher in the entire range of 63 to 2000 Hz). The LH-grade is a grade indicating the degree of sound insulation.

From the above, it was proved that the cushioning material 4a according to the embodiment of the present invention has improved impact sound absorbing performance as compared with the conventional product.

[Additional notes]
The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

1 floor structure 2 floor slab 3 beams 4a to 4d cushioning material 5 second protrusions 6a to 6c first protrusion 7 bases 8a, 8b side surfaces 9a, 9b tip surface

Claims (5)

A cushioning material arranged to support the floor slab from the vertical lower side,
a base extending along the floor slab;
a first projection projecting from a surface of the base facing the floor slab and extending along the longitudinal direction of the base;
Two second protrusions projecting from the facing surface and extending along the longitudinal direction of the base are integrally extruded,
The first protrusion is formed between the two second protrusions,
The height of the first protrusion is higher than the height of the two second protrusions,
The hardness of the first protrusion is less than the hardness of the two second protrusions,
The side surface of the first protrusion in the extending direction is such that the cross-sectional shape of the cross section perpendicular to the extending direction of the first protrusion becomes wider as it approaches the root from the tip of the first protrusion. Inclined cushioning. The first convex portion is formed of a foamed rubber material,
2. The cushioning material according to claim 1, wherein said two second protrusions are made of a hard rubber material. 3. The cushioning material according to claim 1, wherein the two second projections have a rebound resilience of 15% or less. 3. The cushioning material according to claim 2, wherein the specific gravity of the first protrusion is 0.8 or less. The first convex portion is made of NBR or EPDM,
The cushioning material according to any one of claims 1 to 4, wherein the two second protrusions are made of NBR or EPDM.

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