JP2014114689A - Floor impact sound reduction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor structure having elasticity for attenuating impact sounds, that is to say, both a lightweight floor impact sound (a sound of a falling spoon) and a heavy floor impact sound (a jump-up-and-down sound), by stacking cushioning materials.SOLUTION: A floor structure includes an upper layer material 1 of a first sponge-based foam, an intermediate layer material 2 that has a cell space of a honeycomb material filled with a communication-cell rigid phenol foam material, and a lower layer material 5 of a second sponge-based foam. The floor structure is configured as a laminated structure in which the three layers are wholly integrated together. In the floor structure, the hardness of the first sponge-based foam is higher than that of the second sponge-based foam.

Description

  The present invention relates to a laminated structure in which a honeycomb material is used as a core material, and both surfaces of the honeycomb material are sandwiched between elastic foams in order to reduce floor impact sound.

In apartment buildings, walking sounds and falling sounds that are transmitted from the upper floor to the lower floor are noises of concern to residents. Recent houses have a structure in which the interior of the room easily reflects due to the improvement in airtightness, and troubles such as floor impact sounds or instrument noise tend to increase. The types of floor impact sounds are classified into light floor impact sounds “dropping sounds from spoons” and heavy floor impact sounds “children jumping and running around”.

As standard, there is JISA1418 “Measurement method of floor impact sound insulation performance of buildings”. Based on this test method, the Architectural Institute of Japan has established application grades and display scales of sound insulation performance for each building and room use. It has become the standard.

In the floor impact noise countermeasure technology, it is not difficult to reduce the light floor impact noise, but no excellent method has been developed for the heavy floor impact noise countermeasure. At present, practical improvements (lamination of cushioning materials) have been added to the representative methods such as “straight tension method” and “dry sound insulation double floor”, but the complaints have not been resolved. Further, the problem is to reduce the impact sound, to simplify the structure and reduce the weight, to reduce the thickness, to improve the workability and to satisfy the price at the same time, and a new technology is required.

2. Description of the Related Art Conventionally, there is a double floor on which a floor finishing material is arranged on a basic floor (slab) by forming a space with a joist and a baseboard. However, the problem that the impact sound applied to the floor propagates from the joisting board and the baseboard and from the wall to which they come into contact without being attenuated has not been solved.

Specifically, a floor support leg is provided on the foundation surface (floor slab), and flooring is laid on the support leg, so that anti-vibration measures are taken at the floor support leg part, and for tension adjustment of compression and tension type A method for attenuating floor impact sound by providing a vibration isolator damper and a vibration isolator on a support leg is disclosed (Patent Document 1). In this disclosed technology, the floor material is composed of a decorative panel for finishing from the indoor surface, a plywood underlay, and a base plate of particle board. There is no.

In addition, support legs (hollow bolts) are laid on the foundation floor via elastic pedestals, and the flooring is supported by the support legs with a laminate structure of flooring, grooved wood, felt, and board, and the impact sound is supported by the support legs. A technique of blocking by providing flexibility with a base material and a grooved wood material and a felt part structure is disclosed (Patent Document 2). In this disclosed technique, the formation of the groove becomes a point of flexibility, and it is devised not to be broken at the groove part, and the entire structure is a floating floor (double structure), but propagates through the flooring material. A technique for damping impact noise is not disclosed.

Moreover, the technique of the floor board with plasticity is disclosed as a countermeasure of the floor impact sound as a floor board structure which does not employ | adopt a double structure (patent document 3). In this disclosed technology, in order to give plasticity to the floorboard, groove processing is performed on the floorboard substrate, and a soft resin sheet and a nonwoven fabric / buffer material are adhered to the front and back of the substrate, thereby increasing the plasticity and preventing damage. Plasticity is said to be able to cope with unevenness (unevenness) on the floor. However, a technique for attenuating impact sound that propagates through a floor board is not disclosed.

Japanese Patent No. 4009488 Japanese Patent No. 4099082 JP-A-8-82079

According to the techniques disclosed in Patent Documents 1 and 2, the floor structure is a double structure (floating floor) having a space under the floor, and in order to reduce the impact noise, the combination of the support leg and the laminated part of the floor board member, to the material Ingenuity such as groove processing is made. Even if this is effective in reducing the impact sound, there is no countermeasure for the attenuation of the impact sound propagating through the flooring. Other problems to be solved include problems such as insufficient strength due to grooving, heavy structure, complicated construction process (high price), and increased floor thickness and narrowed living space due to the installation of support legs. is there.

The technique disclosed in Patent Document 3 is different from the techniques disclosed in Documents 1 and 2 in that it is not a double structure having an air layer, but is common in that it does not take measures to attenuate the impact sound that propagates through the flooring. . Another problem to be solved is that the wood material needs to be grooved to prevent impact noise, which makes the laminated structure complicated and troublesome.

Further, the frequency band of the impact sound differs between the light floor impact sound (spoon falling sound) and the heavy floor impact sound (jumping sound). Therefore, it is necessary to consider light floor impact sound countermeasures and heavy floor impact sound countermeasures separately, but there is no disclosure of technology regarding the underlayer that can commonly handle two types of floor impact sounds.

The present invention has been made in view of the above problems, and is an upper layer material made of a first sponge-based foam, an intermediate layer material in which a cell space of a honeycomb material is filled with an open cell hard phenol foam material, and a second sponge-based foam. The upper layer material and the intermediate layer material were fixed with an adhesive applied to the end portion of the honeycomb material, and the intermediate layer material and the lower layer material were applied to the entire surface of the intermediate layer material or the lower layer material. In the laminated structure in which the entire three layers are integrated by being fixed with an adhesive, the hardness of the first sponge foam is higher than the hardness of the second sponge foam. The object is achieved by a floor structure with elastic characteristics of impact sound attenuation.

  The underlying layer (impact sound attenuating layer) is shared as an upper layer material, an intermediate layer material, and a lower layer material, and at the same time integrated to give elasticity (flexibility, plasticity) to the entire structure. The upper layer material is made of a material having a relatively high hardness and density in order to provide functions such as impact sound absorption, impact dispersion, vibration dispersion, vibration suppression, prevention of unnatural sinking (a fluffy feeling) during walking, and light weight. Specifically, sponge material is selected, and hardness, compression hardness, compression set, density, thickness, and material are optimized. In particular, the response to the fluffy feeling can be realized by the balance of the thickness of the upper layer material and the honeycomb material surface strength of the intermediate layer material in addition to the selection of hardness, compression hardness, compression set and density.

  The intermediate layer material has functions such as surface strength to support the upper layer material, rigidity as a core material that receives floor load, structure that disperses impact sound, vibration suppression of the upper layer material, sound absorption structure, light weight / substitution of groove structure, etc. Required. In order to achieve this, a honeycomb material is used, and the honeycomb material has material, strength, cell diameter, appropriate adhesion to the upper and lower layer material surfaces, open cell hard phenol foam material filling the cell space, and appropriate filling, etc. An important option. The flexibility (plasticity) obtained from the groove structure described in Patent Document 3 can be realized by a combination of an intermediate layer material having a honeycomb material as a core and an elastic layer of an upper layer material and a lower layer material in the structure of the present invention. .

  The lower layer material is required to have functions such as impact sound absorption, impact dispersion, vibration dispersion, vibration suppression, and non-land response. In addition, since the upper layer material is a layer having a relatively high hardness and rigidity, the lower layer material is a soft layer having a relatively low hardness and density as a residual sound attenuation layer. Specifically, a sponge material is selected as the lower layer material, and selection of hardness, compression hardness, density, thickness, and material is an important technique. Since the lower layer material is a surface in contact with the foundation surface (floor foundation / foundation floor) which is the floor foundation, it is necessary to cope with unevenness of the foundation surface, and flexibility is also required from this aspect.

The specimen 1 in Table-8 is the structure shown in FIG. 1, and the specimen A having a hardness of 35 shown in Table-1 was used as the upper layer material. When this performance is applied to the grades described in the “Building Sound Insulation Performance Standards and Design Guidelines (Architectural Institute of Japan)” guidelines, light impact sound is L-40, a special grade of application grade, and heavy impact sound is evaluated as heavy flooring. The second grade of application grade was obtained with L-55. This result is the performance which can exert an effect in the present improvement in which the sound insulation performance of a general apartment is constructed in the range of L-55 to L-65.

  In addition, the structure of the present invention shown in FIG. 1 has a light impact sound of L-40 to 45, weight impact, based on the sound insulation performance results of test specimens 1 to 5 shown in Table-8 (35 and 45 in the upper layer material hardness of Table 4). With the sound, L-55 was obtained regardless of the finishing material (test bodies 4 and 5 in Table 4), and a result that can be used in common as an underlayer was obtained.

By adopting the structure of the present invention, the weight of 9 kg (JIS is 7.5 kg), the cell of the honeycomb material of the intermediate layer, and the upper layer material and the lower layer material were not damaged in 10 tire drop tests. In addition, it was confirmed that the honeycomb cell, the upper layer material and the lower layer material were not damaged and the structure had stable durability even when the foot test was performed 1,000 times under the conditions of weight 70 kg and shoe size 26. The upper layer material and the lower layer material are elastic materials, have a load absorbing action, and the compressive strength of the honeycomb material of the intermediate layer is 9.8 kg · f / cm ² , so that surface strength is produced. Although it is such a material having strength resistance, the processing is simple enough to be performed with a cutter knife or a power tool.

The structure of FIG. 1 has a thickness of 16 mm, is composed of three layers, and is thin and lightweight with a weight of 1.3 kg / m ² .
This underlayer was confirmed to have a heat insulation property of 0.043 W / m · k (measuring temperature 23 ° C.) by the JIS A1412-2 method.

In general, in the case of a wooden flooring material, in a long-term moisture environment, the adhesive layer deteriorates and peeling occurs in the laminated portion, resulting in a sizzling. As a countermeasure, the foam material mainly composed of closed-cell polyolefin resin having a thickness of 5 mm, which is not breathable in this structure, is adhered to the back surface of the flooring material, so that the moisture supply is cut off, and the wood part It will not be affected and will be a measure to prevent delamination.

The foam material mainly composed of closed-cell polyolefin resin used for the upper layer material and lower layer material is flexible and stretches (elongation 120-140%). It has the function of damping the upper layer material and lower layer material against shaking.

Cross section of the entire underlayer (laminated body of upper layer material, intermediate layer material, lower layer material) Figure with the finishing material (carpet) laminated to the structure of Fig. 1 Figure when constructing the structure of Fig. 2 continuously Figure constructed with one finishing material (carpet) on multiple sheets of the structure shown in Fig. 1. Figure of the flooring material of the finishing material laminated on the structure of FIG. The figure which arranged and constructed the structure of Drawing 5 continuously. Figure constructed with commercially available standard flooring material on the structure of Fig. 1 A figure showing how to assemble a commercially available flooring material (Yu) and the nail usage position "Reference curve that defines the reference frequency characteristics of sound insulation grade related to floor impact sound level" defined by JIS (Architectural Institute of Japan) Lightweight impact sound test (tapping machine) cutoff performance Weight impact sound test (bang machine) cutoff performance

The upper layer material directly subjected to impact is C-hardness 45, compression hardness 0.15 MPa, compression set 3.3% (24H), elongation 140%, density 100 kg / m ³ , 5 mm thick closed cell polyolefin -Based foam material (Mitsuku Foam FR-15: Mifuku Kogyo), C hardness 35, compression hardness 0.08MPa, compression set 2.7% (24H), elongation 190%, density 100kg / M ³ and a foam material (mixed foam V-15: Mifuku Kogyo Co., Ltd.) containing 5 mm thick closed cell polyolefin resin as a main component is used. These selected characteristics are also effective in reducing the impact sound and eliminating the fluffiness when walking.

The intermediate layer material is a honeycomb material layer filled with an open cell hard phenol foam material having a sound absorbing function. In addition to attenuating the propagation impact sound of the upper layer material, the fluffy feeling of the upper layer material is suppressed by the fine cell surface of the honeycomb material, thereby providing a strength layer that supports the upper layer material. The honeycomb material has a density of 52 kg / m ³ , a cell diameter of 8.5 mm, a compressive strength of 9.8 kg · f / cm ² , and a roll core S-85 (Japanese feather core product, paper material). The thickness of the honeycomb material is 7 mm. However, if the thickness is 7 mm or more, the attenuation is further improved. Therefore, the thickness can be changed according to use conditions (for example, when piping or wiring is required inside the underlayer). The thickness of the structure of the present invention can be freely adjusted using a honeycomb material. The honeycomb material is not limited to paper, and may be a resin impregnated material, metal, or resin. As a basis for selecting a cell diameter of 8.5 mm and a compressive strength of 9.3 kg · f / cm ² , it is strong enough to withstand nailing.

  The upper layer material and the intermediate layer material are laminated by an emulsion adhesive applied only to the end of the honeycomb material. The bonding portion is only the contact portion with the upper layer material applied to the end portion of the honeycomb material.

Normally (floor of aircraft etc.) honeycomb material cells are used in a space state, but in the present invention, a solid phenol foam material having a density of 20 kg / m ³ with open cells is absorbed into the honeycomb material space portion having a thickness of 7 mm. In order to increase the damping effect, to prevent buckling when a load is applied, and to prevent the lower layer material from being recessed in the honeycomb cell portion of the space due to the load. The open-celled rigid phenolic foam material used here is a foam material that is normally used as Kenzan (for ikebana). It is water-absorbent and allows moisture in the emulsion adhesive used to bond the upper layer material to the intermediate layer material. The cellular hard phenol foam material is instantly absorbed as it is filled into the honeycomb material.

  In this structure, foam material mainly composed of non-vented closed cell polyolefin resin is used for the upper layer material and lower layer material, so the intermediate layer material is hermetically sealed, which is important for curing the emulsion adhesive. An open cell rigid phenolic foam material is required as an absorbent material. Note that a water-absorbing foam is not required unless an emulsion system is used for the adhesive. In the case where the effect of sound absorption and vibration suppression is not required, a closed cell foam material may be used.

Further, when the honeycomb material is not subjected to water-resistant treatment, the honeycomb material is softened by the moisture of the emulsion adhesive. When the open cell hard phenol foam material is filled in the honeycomb material cell, a pressure of 6 to 8 ton / m ² is applied. At the time of this pressurization, if the moisture of the adhesive contains moisture in the honeycomb material, the honeycomb material is softened, the strength of the honeycomb material is reduced, the honeycomb material thickness is reduced, and at the same time, the bubbles of the open cell hard phenol foam material are compressed, I will crush it. For this reason, in order to absorb the moisture of the adhesive instantly and not to reduce the honeycomb strength, it is effective to interpose the open cell hard phenol foam material having an excellent absorption function.

Further, the honeycomb material of the intermediate layer material also plays a role of impact strength attenuation and impact sound dispersion with respect to the lower layer material. When the cell diameter of the paper honeycomb material (without resin impregnation) is 13 mm, the cell (space condition without foam filling) buckled in a tire drop test with a weight of 9 kg and a foot test with a weight of 70 kg, but abnormal with a cell diameter of 8.5 mm There was no.

The lower layer material is a layer that attenuates the residual sound of the impact sound by the upper layer material and the intermediate layer material. It is also a surface that contacts the base surface (slab), and has the role of adjusting unevenness of the base surface. As this condition, in the present invention, a foam material mainly composed of closed-cell polyolefin resin is softer than the upper layer material, C hardness 20, compression hardness 0.04 MPa, compression set 5.6% (24H), elongation 120% , Density 35 kg / m ³ , thickness 4 mm (Sanwa processing, Sanperca 2501NNN) was selected. The balance between hardness and density is important, and appropriateness was confirmed from the examination range to a hardness of 20 to 28 and a density of 30 to 80 kg / m ³ .

Laminating the lower layer material and the intermediate layer material is made of an acrylic / urethane adhesive (manufactured by Soken Chemical Co., Ltd. ) applied to the entire surface of the foam material mainly composed of closed-cell polyolefin resin of the lower layer material, and the honeycomb material and the filled foam material Adhere the entire surface. Vibration suppression of the foam material mainly composed of closed-cell polyolefin-based resin can be realized by whole surface adhesion.
The lower layer material and the base surface (slab) which is the floor are adhered to each other, thereby realizing the vibration damping function of the foam material mainly composed of the lower layer material polyolefin resin.

  A finishing material 8 is adhered to the upper layer material 1 shown in FIG. Finishing materials include carpets and mats for lightweight impact sounds, and carpets, tiles, flooring and tatami for heavy impact sounds. Since the underlayer of the structure of FIG. 1 has a high impact sound attenuation effect, one type of underlayer can be used for two types of impact sounds, a lightweight impact sound and a heavy impact sound. As a result, the range of selection of finishing materials is expanded.

The combination of the underlayer and the finishing material will be described. When a carpet is used as the finishing material, there is a method of FIG. 2 in which the size of the base layer is adjusted to the size of the carpet of the commercially available material, and the finishing material 8 and the base layer are bonded in advance, and the structure of FIG. Adhere side by side as in 3. Alternatively, there is a method in which the base layer shown in FIG. 1 is adhered and arranged on the base surface, and finished with a single sheet using a carpet (may be jutan) suitable for the room size after completion. Further, by bonding the finishing material 8 and the base surface 12 to the upper layer material and the lower layer material of the base layer in FIG. 1 with a double-sided tape or an adhesive (an upper layer material with an adhesive and a lower layer material may be used in advance), The upper layer material and the lower layer material can exhibit a damping function.

  In some cases, a flooring material is used as the finishing material. The standard dimensions of commercially available materials are 300 × 1, 820 mm, thicknesses of 12 mm, 15 mm, etc. In order to suppress the propagation of impact sound, it is preferable to divide in the horizontal direction, and for the thickness, a thin flooring material is selected in order to make use of the damping and damping function of the underlayer. As shown in FIG. 5, the flooring material 10 is pre-adhered to the base layer of FIG. 1, arranged on the base surface, and diagonally nailed with the nail 11 and fixed to the base surface 12. In this case, the adhesive 9 may be used in combination in order to increase the vibration damping effect of the base surface 12 and the lower layer material 5. The flooring material 10 is connected by the male solid 13 in FIG. 8, but when there is no male solid 13, a silicone caulking material is applied to the joint of the flooring material 10 and the joint of the flooring material 10 is stabilized by an adhesive force.

  There is also a method in which a plurality of base layers of, for example, about 300 × 600 mm are bonded to the base surface 12 in advance on the base surface, and then finished with a flooring material 10a having a commercial size of 300 × 1, 820 mm. In this case, the flooring material 10a can be assembled by the method shown in FIG. The flooring material 10a may be fixed with a nail or in combination with adhesion.

  When the adhesive and the honeycomb material are flammable by themselves, the honeycomb material is sandwiched between a foam material containing a combustible paper honeycomb material and an adhesive with a non-breathable, non-breathable closed-cell polyolefin resin. Both sides can be flame retardant. Further, as a countermeasure for flame retarding on the surface of the edge of the honeycomb material of the intermediate layer material, the honeycomb material is positioned so as to be inside the open cell hard phenol foam material that does not ignite. As a result, it is possible to realize a structure in which oxygen is blocked, and it is possible to pass the material combustion test for railway vehicles.

FIG. 1 shows the underlayer structure of the present invention. The upper layer material 1 is a foam material mainly composed of a closed cell polyolefin resin having a thickness of 5 mm, a density of 100 kg / m ³ , and a C hardness of 45. The intermediate layer material is a paper-type honeycomb material having a thickness of 7 mm and a cell size of 8.5 mm. 2 is composed of a layer in which a honeycomb material cell is filled with a water-absorbing open-celled hard phenol foam material 3 having a thickness of 7 mm and a density of 20 kg / m ³ , and the lower layer material 5 has an independent thickness of 4 mm and a density of 35 kg / m ³ . It consists of a foam material whose main component is cellular polyolefin resin. The upper layer material 1 and the honeycomb material 2 are bonded with an ethylene-vinyl acetate copolymer emulsion adhesive 4 applied only to the tip of the honeycomb material cell, and the adhesion between the lower layer material 5 and the honeycomb material 2 is applied to the entire surface of the lower layer material 5. Bonded with acrylic / urethane adhesive.

As material selection, the upper layer material was examined under the test conditions shown in Table-1. As a result, for the foam material mainly composed of the closed cell polyolefin-based resin of the upper layer material 1, specimens A and B were selected from the test results of Table 1. The superiority or inferiority of the test specimens A and B could be confirmed from the results of the lightweight floor impact test and the heavy floor impact test in the test using the facilities of a public institution.
The evaluation conditions are as follows.
Falling object shape: Resin tire type
Weight / Diameter: 300g / 100φ (width = 25mm)
Drop height: 500mm Ground condition: 21mm plywood (room 2nd floor condition)

The fluffy feeling in the test body B is not felt at a thickness of 5 mm, but is felt when the thickness is 10 mm. The appropriate thickness is in the range of 4-8 mm. It was appropriate that the hardness was 30 to 40 and the density was 90 to 130 kg / m ³ which was slightly wider than the range shown in Table 1.

The honeycomb material 2 of the intermediate layer material needs the surface strength to support the upper layer material, and the cell diameter that causes this was selected in the test of Table-2, and the test body (2) was selected as the base of the structure in FIG. . Furthermore, whether or not the condition (2) is acceptable can be confirmed from a lightweight floor impact test and a heavy floor impact test using a test facility of a public institution.
The evaluation conditions are as follows.
Falling object shape: Commercial tire
Weight / Diameter: 9kg, 250mm (width = 150mm)
Drop height: 850mm
Air pressure: 2.4 kg / cm ²
Base condition: 300mm concrete
Number of drops: 10 times
Honeycomb material / thickness: paper (no resin impregnation), 7 mm
Honeycomb cell filling: No open cell rigid phenolic foam filling (space condition)

  For honeycomb materials, the cell shape may be round, triangular, square, hexagonal or more. The material may be metal, resin, paper, paper impregnated with resin, or the like. In the honeycomb material in which the resin is impregnated with paper to increase the strength, the cell does not buckle even if the cell diameter is 13 mm. Considering the balance between the upper layer material and the lower layer material, the appropriate range of the cell diameter is 6-9 mm from the commercially available material in terms of cell buckling measures and foam filling properties. This is also an appropriate range for countermeasures against puncture destruction.

The foam material mainly composed of closed-cell polyolefin-based resin of the lower layer material 5 is a layer that further attenuates the propagation residual sound, and also serves to adjust the unevenness of the base surface (slab), so it is more flexible than the upper layer material 1. Material is required, hardness 20, compression hardness 0.04MPa, compression set 5.6% (24H), elongation 120%, density 35kg / m ³ , thickness 3-8mm suitable for fluffy feeling measures It is. The foam material mainly composed of the closed-cell polyolefin resin has hardness and compression hardness, and is more flexible than the upper layer material.

  The lower layer material 5 that requires moderate hardness and flexibility has a risk that the foam may break and break at the cells of the honeycomb material when a load is applied for a long time from above. As a countermeasure, selection of the honeycomb material cell diameter of the intermediate layer material is important. In the example, the honeycomb tip having a cell diameter of 13 mm was stuck in the lower layer material, and the honeycomb tip having a cell diameter of 8.5 mm was not stuck in the lower layer material. By reducing the honeycomb material cell diameter and increasing the total number of cells, strength is not added to the lower layer material. Therefore, a commercially available material (roll core S-85, Nippon Feather Core product, paper material) having a fine cell diameter of 8.5 mm was selected.

The open-celled hard phenol foam material filled in the honeycomb material space has sound absorption and vibration control effects, and a water-absorbing open-celled hard phenol foam material having a density of 20 kg / m ³ was selected. The foam thickness is equal to the honeycomb thickness or about minus 0.5 to 1.0 mm. The reason for adopting open-cell water-absorbing rigid phenol foam is the utilization of the function of absorbing the moisture of the ethylene-vinyl acetate copolymer emulsion adhesive in addition to sound absorption and vibration control.

  Both sides of the intermediate layer material in FIG. 1 are surrounded by a foam material mainly composed of a non-ventilated closed-cell polyolefin resin, and there is no moisture absorbent layer, and the ethylene-vinyl acetate copolymer emulsion-based adhesive is cured. Does not promote. By interposing a water-absorbing foam, moisture is instantaneously absorbed and curing is promoted. Further, the structure in which the bubbles communicate with each other also has an effect as a resin odor absorbing material of the emulsion adhesive. The moisture and odor are held in a state of being enclosed in the open cell rigid phenol foam material. The residual moisture absorbed contributes to flame retardancy of the paper honeycomb material and adhesive during combustion.

Also, when using a paper honeycomb that has not been subjected to water-resistant treatment, it also serves as a water-absorbing foam material. When the open cell rigid phenol foam material is filled in the honeycomb material cell, the pressure is applied at 6 to 8 ton / m ² . Under this pressure condition, the honeycomb material portion to which the adhesive is applied is softened by moisture. Simultaneously with filling, the open-celled rigid phenol foam material instantly absorbs moisture from the foam and does not decrease the strength of the honeycomb material.

The upper layer material 1 is a foam material mainly composed of a closed-cell polyolefin-based resin, and is generally difficult to bond. Therefore, it is necessary to select an appropriate adhesive 4 that enables bonding. In the present invention, it is necessary to apply an adhesive only to the cell end portion of the honeycomb material 2 and adhere it to the surface of the upper layer material 1. For this reason, EVA resin (ethylene-vinyl acetate copolymer emulsion system) emulsion adhesive (Aika Industry: Avon AE-126) suitable for foam materials mainly composed of polyolefin resin was selected. For the adhesion between the lower layer material 5 and the honeycomb material 2 and the open cell hard phenol foam material 3, an acrylic / urethane adhesive 5 applied to the entire surface of the foam material mainly composed of closed cell polyolefin resin was selected. .

  FIG. 2 is a diagram in which a 4 mm carpet (bonding configuration: 2 mm polypropylene fiber mat + 2 mm polyvinyl chloride) is bonded as a finishing material 8 to the surface on the indoor (walking) side of the upper layer material 1 of FIG. 1. It is. The surface used for light floor impact noise (spoon drop sound) countermeasures is not limited to carpet. The factor that determines the light floor impact sound level is the hardness (Young's modulus) of the finishing material surface. Under the living environment, the finishing material is selected based on the feeling of fluffiness when walking.

  When using a flooring material as a finishing material, it is important to select a thickness. If it is thin, the impact sound is attenuated and reduced by the underlying layer, but the fluffy feeling increases. When it is thick, the impact sound becomes loud, but the fluffy feeling decreases. Therefore, it is important to select a minimum thickness that eliminates the fluffy feeling. In the test of Table 3, it was concluded that the flooring material thickness to be combined with the underlayer requires a minimum of 12 mm from the test of Table-3. This test is a test for selecting a flooring finishing material to be used for a light floor impact test and a heavy floor impact test of a public engine test.

The evaluation conditions are as follows.
Flooring material base: Fig. 1 Structure Falling object shape: Resin tire type Weight / Diameter: 300g, 100φ (width = 25mm)
Drop height: 300mm
Ground condition: 21mm plywood (room 2nd floor condition)

  FIG. 3 shows a diagram in the case of constructing a structure using the carpet shown in FIG. 2 on site. A commercially available carpet 500 × 500 mm is used, and the base layer of FIG. 1 matched to the dimensions is adhered and arranged as shown in FIG. In addition, the base layer and the finishing material are not limited to the same size, but a plurality of small base layers (for example, 500 × 500 mm, 300 × 300 mm, etc.) are first applied to the base surface, and the finishing material has a size suitable for the room There is also a case of FIG. 4 where finishing is performed with a single-layer 8a carpet or jutan. The base surface and the base layer are bonded together for damping the base layer and the base surface. The finishing method is also best secured by bonding.

  FIG. 5 is a view in which the flooring material 10 is bonded to the upper layer material of the underlayer of FIG. The dimensions of the commercially available flooring material 10 are 300 × 1, 820 mm as standard, and the thickness is 12 mm, 15 mm. In terms of ease of handling during construction and the point of blocking the propagation of impact sound, the commercially available flooring material 10 is preferably cut short and divided. FIG. 5 is a view in which a flooring material having a size of 300 × 910 mm and a thickness of 12 mm is bonded to the base layer. At the site, the structures of FIG. 5 are arranged as shown in FIG. 6 and fixed with the nail 11 and the adhesive 9. There are also ways of just nails or just gluing. If silicone caulking 14 is used at the joint of the structure shown in FIG. 4, the seam is bonded, and the whole is integrated to eliminate the step.

  As a construction method of the flooring material using 300 × 1, 820 mm which is not divided, as shown in FIG. 7, the base layer of a short 300 × 600 mm of FIG. 1 is first applied to the base surface 12, and 300 × 1, A regular commercial flooring material 10a having a length of 820 mm is finished by a male method indicated by reference numeral 13. Although the flooring material may be incorporated in the case of FIGS. 5 and 6 in which the male method of reference numeral 13 is not used, the assembling method (standard of commercially available material) shown in reference numeral 13 of FIG. 8 is used. The base surface is fixed to the base surface 12 by using only the nail or a combination of the nail and an adhesive.

  This base layer can also finish the code | symbol 10 part of FIG. 5 with a tatami surface material. One tatami mat is 1,760 x 880 mm, but it is 880 x 440 mm, which is an easy-to-use semi-tatami unit. It was. When this base layer material was used, the traditional manufacturing method may be used, and the finishing of the tatami surface can be improved with the recent sewing method, and the walking sensation is also excellent. In some cases, the tatami surface and the upper layer material 1 are bonded.

  Based on the results of the material selection described above, the ground layer shown in Fig. 1 was manufactured, and the test equipment for floor impact sound countermeasures based on the conditions shown in Table 4 was tested using a public institution (Nippon Building Research Laboratory) test facility. . In the test samples 1 and 2, the hardness of the upper layer material is appropriate, in the test samples 2 and 3, the intermediate layer thickness is appropriate, and in the test samples 4 and 5, the difference in finishing material based on the hardness 45 of the test sample 2 is shown. investigated. This comparative test was carried out by a lightweight impact sound test (tapping machine) and a weight impact sound test (bang machine) described in JIS A1419 (Architectural Institute of Japan) to evaluate the specimen. The test conditions are shown in Table 4 below, and the floor impact sound reduction results are described below.

  A light impact sound test (using a tapping machine) and a Table-6 heavy impact sound test (using a bung machine) were conducted to evaluate the sound insulation grade of the floor impact sound reduction level of the test specimen. The results of Table-5 and Table-6 were obtained. Light impact sound is falling sound of a spoon or the like, and heavy impact sound is a jumping sound of a child. The data below is the volume value when the base surface (no treatment) and this test specimen are attached.

  FIG. 9 is an application grade standard curve defined by the Architectural Institute of Japan in JIS A1419. FIG. 10 and FIG. 11 show only the result of the test body 1 from the results of Tables 5 and 6 together with FIG. On the other hand, between the reference curve and the grade in FIG. 9, there are “sound insulation performance standards and design guidelines for buildings” shown in Table 7 defined by the Architectural Institute of Japan.

When the results of the test body 1 of FIGS. 10 and 11 are applied to Table-7, and the same applies to the test bodies 2 to 5, the grades of Table-8 are obtained.

  The results in Table 8 show that the test body 1 is in the special grade in the lightweight impact sound test, and the others are in the first grade. In the weight impact sound test, all of the specimens were second grade. What can be read from this result indicates that if the foundation layer in FIG. 1 is excellent in reducing floor impact sound as in the structure of the present invention, the result does not depend on the type of finishing material. From this result, the problem to be solved was achieved.

As a flame retardant measure, the combustible paper honeycomb material 2 and the adhesives 4 and 6 are sandwiched between foam materials 1 and 5 mainly composed of a flame-retardant and non-breathable closed-cell polyolefin resin as shown in FIG. Oxygen can be shut off and no ignition occurs. Further, in this structure, the edge surface of the combustible paper honeycomb material is the inside (FIG. 1A) of the open-celled hard phenol foam material 3 that does not ignite, and is not exposed to the outside. As a result, the direct oxygen supply to the combustible paper honeycomb material and the adhesive is cut off, and the honeycomb material and the adhesive are not ignited during combustion.

DESCRIPTION OF SYMBOLS 1 Foam material whose upper layer material is mainly composed of closed cell polyolefin resin 2 Intermediate layer material honeycomb material 3 Open-cell hard phenol foam material 4 Adhesive between upper layer material and intermediate layer material 5 Lower layer material hardness is low Foam material mainly composed of closed-cell polyolefin resin 6 Adhesive for intermediate layer material and lower layer material 7 Adhesive for finishing material 8 Finishing material (carpets: 2 mm polypropylene fiber + 2 mm polyvinyl chloride)
8a Room size finishing material (carpets)
9 Base Surface (Slab) and Underlayer Adhesive 10 Divided Flooring Floor Finishing Material 10a Commercial Fixed Flooring Floor Finishing Material 11 Nail 12 Base Surface 13 Commercially Available Standard Flooring Flooring Finishing Material 14 Silicone Caulking Adhesive A Open-celled rigid phenolic foam edge (honeycomb material inside open-celled rigid phenolic foam)

Claims (8)

It consists of an upper layer material made of the first sponge-based foam, an intermediate layer material in which the cell space of the honeycomb material is filled with a hard phenol foam material, and a lower layer material made of the second sponge-based foam, and the upper layer material and the intermediate layer material are The above-mentioned honeycomb material is bonded and fixed with an adhesive applied to the end portion thereof, and the intermediate layer material and the lower layer material are bonded and fixed with an adhesive applied to the entire surface of the intermediate layer material or the lower layer material. In a laminated structure in which all three layers are integrated, the floor having the elastic characteristic of impact sound attenuation, characterized in that the hardness of the first sponge foam is higher than the hardness of the second sponge foam. Structure. 2. The floor structure according to claim 1, wherein the sponge foam of the upper layer material is a foam material mainly composed of closed-cell polyolefin resin and has a hardness of 30 to 40 and a density of 90 to 130 kg / m ³ . The lower layer material is a foam material mainly composed of closed-cell polyolefin resin, and has a hardness of 20 to 28 and a density of 30 to 80 kg / m ^3. The floor structure according to claim 1, wherein the honeycomb material has a cell diameter of 6 to 9 mm. 2. The floor structure according to claim 1, wherein the foam material filled in the honeycomb material cell has water absorption and odor absorption properties, and has open-cell bubbles that retain the absorbed water and odor in the material. Floor structure characterized by rigid phenolic foam material 2. The floor structure according to claim 1, wherein an adhesive that adheres and fixes the foam material mainly composed of closed-cell polyolefin-based resin of the upper layer material and the intermediate layer material is an emulsion adhesive, The adhesive that adheres and fixes the foam material of the lower layer material, which is mainly composed of closed-cell polyolefin resin, the honeycomb material of the intermediate layer material, and the open-celled hard phenol foam material, is an acrylic / urethane adhesive. Characteristic floor structure The floor structure according to claim 1, wherein the upper layer material, the intermediate layer material, and the lower layer material are integrated, and the upper layer material is finished with a flooring or a carpet material on a surface opposite to the intermediate layer material. Floor structure characterized by bonding and fixing materials 2. The floor structure according to claim 1, wherein the honeycomb material is combustible made of paper, and the sponge foam of the upper layer material and the lower layer material is a closed-cell polyolefin-based material that is flame-retardant and has no air permeability. A foam material mainly composed of a resin, wherein the rigid foam of the intermediate layer material is open-celled hard phenol foam that does not ignite, and the edge surface of the intermediate layer material has a honeycomb material surface of the open-celled hard fail foam Floor structure characterized by being inside the material The floor structure according to claim 1, wherein the thickness of the upper layer material is 4 to 8 mm and the thickness of the lower layer material is 3 to 8 mm.