JP7144665B2 - Soundproof floor structure and floor soundproofing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof floor structure and a floor soundproofing method capable of reducing heavy floor impact noise from upper floors in a multi-story building (multi-story building).

Conventionally, it has been difficult to take countermeasures against impact noise (particularly heavy floor impact noise) from upper floors, because it depends on the natural frequency of the building frame such as the underfloor material. As a countermeasure, a wet-type floating floor structure is known in which an insulating material such as glass wool is applied to the underfloor and a heavy material such as concrete is applied thereon. However, even the wet floating floor structure does not provide sufficient soundproofing against heavy floor impact noise. On the other hand, a method of attaching a dynamic damper (dynamic vibration absorber), which absorbs and attenuates the floor impact noise by its own vibration, to the underfloor material has also been proposed.

Japanese Patent Application Laid-Open No. 2001-49781 (Patent Document 1) describes a floor structure in which a plurality of floor joists are attached across opposing floor beams, and a floor material is attached on the floor joists. A floor structure is disclosed in which fixtures are attached to the side surfaces of joists, and weights are suspended from the fixtures via dampers. This document describes that when the floor joist vibrates, the weight vibrates through the fixture and the damper, and the vibration of the weight vibrates the floor joist through the damper and the fixture, thereby attenuating the vibration. Have been described. As the damper, a damper in which a sealed container formed of a rubber plate and a metal plate is filled with a viscous liquid such as silicone oil, lubricating oil, or vegetable oil is described. A disk-shaped damper is described as the dynamic damper, and this disk-shaped dynamic damper is attached to a fixture with a shaft formed at the center of the disk.

However, this damper has a complicated structure and low productivity. Furthermore, the weight is large, the handleability is low, and the soundproofing in the low frequency range is not sufficient.

Japanese Patent Application Laid-Open No. 2016-191298 (Patent Document 2) discloses that a plate-shaped soundproofing material is restrained by a connector while facing the surface of the underfloor material and separated from the surface of the underfloor material. A soundproof floor construction is disclosed. A laminate of a soft layer containing asphalt and a hard layer made of metal is described as the plate-like soundproof material. This floor structure is suitable for damping heavy floor impact sounds of about 5 to 50 Hz.

However, this soundproof floor structure does not have sufficient damping properties, especially in wooden buildings. In addition, since the soundproof plate used is fastened to the underfloor material, it is difficult to work from the lower floor. The workability of the floor structure is low because it is connected to

JP 2001-49781 A (claims, paragraphs [0015] [0016] [0036] [0037], FIGS. 7 to 8, FIG. 12) JP 2016-191298 A (claims, paragraph [0079])

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a soundproof floor structure and a floor soundproofing method capable of reducing heavy floor impact noise with high workability.

Another object of the present invention is to provide a soundproof floor structure and a floor soundproofing method that can maintain soundproofing for a long period of time and have excellent durability.

Still another object of the present invention is to provide a soundproof floor structure and a floor soundproofing method capable of reducing heavy floor impact noise from upper floors in a multi-story wooden building with a simple structure.

The inventors of the present invention have made intensive studies to achieve the above object, and as a result, have found that a soundproof plate including a soft layer with a high specific gravity containing an elastic body and a hard layer laminated and bonded to at least one surface of the soft layer It is possible to reduce heavy floor impact noise with high workability by restraining the material to the floor beams and/or floor joists via the connectors with a partial area of the plate surface attached to the connectors. He found the headline and completed the present invention.

The soundproof floor structure of the present invention comprises a plurality of floor beams including one or more sets of floor beams that face each other with a gap and are parallel to each other in the length direction, and the floor beams that intersect the floor beams between the opposing floor beams. and a plate-shaped soundproof material that is restrained by the floor joist and/or the floor joist via a connector, and a part of the plate surface of which is attached to the connector. A soundproof floor structure comprising: a soft layer in which the plate-like soundproof material contains an elastic body and has a specific gravity of 1.5 or more; and a hard layer laminated and joined to at least one surface of the soft layer including. The plate-like soundproof material may be restrained by the floor joists. In the soundproof floor structure, a plurality of floor joists are spanned in parallel at intervals between opposing floor joists, a plate-shaped soundproof material is disposed between the adjacent floor joists, and two or more may be fixed to the floor joist with a connector. The plate-like soundproof material may have a rectangular plate surface, and the length direction of the plate surface may be parallel to the length direction of the floor joists. The plate-like soundproofing material may be fixed to the connector at both ends in the length direction of the plate surface. The connectors are fixed by being bridged between the adjacent floor joists so as to cross over the floor joists, and the plate-like soundproofing material is placed on the connectors and fixed. may have been In the plate-like soundproof material, the area ratio of the region where the connector is mounted may be 50% or less of the entire plate surface. The plate-shaped soundproof material is a laminate of a soft layer containing asphalt as an elastic body and a hard layer formed of metal and laminated and bonded to one side of the soft layer, and has a natural frequency of 5 to 50 Hz. may have The soundproof floor structure may be a floor structure of a wooden building.

In the present invention, a plurality of floor beams including one or more sets of floor beams facing each other with a space in parallel with the length direction, and a bridge between the facing floor beams crossing the floor beams A soundproofing method for a floor including a floor joist and a floor joist, wherein a part of a plate surface of a plate-shaped soundproofing material is attached to a connector so that the plate-shaped soundproofing material is connected to the floor through the connector. A soft layer containing an elastic body and having a specific gravity of 1.5 or more is laminated and joined to at least one surface of the soft layer as the plate-shaped soundproofing material while restrained to the beam and/or the floor joist. Also included is a method of soundproofing using a soundproofing material that includes a hard layer coated with a hard layer.

In the present invention, a plate-like soundproof material including a high-specific-gravity soft layer containing an elastic body and a hard layer laminated and bonded to at least one surface of the soft layer is provided with a connecting member at a part of the plate surface. Since it is restrained by the floor beam and/or the floor joist via the connecting member in a state where it is attached to the floor, it is possible to reduce heavy floor impact noise with high workability. In addition, if the plate-shaped soundproofing material is restrained to the floor joists by connecting a connector between the adjacent floor joists, it is not only easy to install, but also the soundproofing can be maintained for a long time and the durability is improved. can. In addition, it is possible to reduce heavy floor impact noise from the upper floors of a multi-story wooden building with a simple structure.

FIG. 1 is a schematic plan view showing an example of the soundproof floor structure of the present invention. 2 is a schematic side view of the soundproof floor structure of FIG. 1. FIG. FIG. 3 is a schematic side view showing an example of the plate-like soundproof material of the present invention. FIG. 4 is a schematic plan view showing another example of the soundproof floor structure of the present invention. FIG. 5 is a schematic plan view showing still another example of the soundproof floor structure of the present invention.

[Soundproof floor structure]
Hereinafter, the soundproof floor structure of the present invention will be described with reference to the drawings as necessary. FIG. 1 is a schematic plan view showing an example of the soundproof floor structure of the present invention, and FIG. 2 is a schematic side view of the soundproof floor structure of FIG.

This soundproof floor structure has a framework in which floor joists 3 are spanned between floor beams 4 facing each other perpendicularly to the floor beams 4 at intervals. , has a rectangular surface shape, the length direction of the plate surface is arranged parallel to the length direction of the floor joist 3, and both ends in the length direction are fixed with the couplings 2. are restrained (restrained and fixed) to two adjacent floor joists 3.

Specifically, as shown in FIG. 1, the connectors 2 are spanned between adjacent floor joists 3 at intervals, and the connectors 2 in FIG. As shown in FIG. 2, which is a side view, the connector 2 includes a long plate-like portion 2a and sidewalls extending perpendicularly to the plate surface from both longitudinal ends of the plate-like portion 2a. and the portion 2b. That is, each of the connecting members 2 has a U-shape in a side view in which both ends in the longitudinal direction are bent perpendicularly to the plate surface in each long plate, and the side wall portions 2b at both ends are adjacent to each other. It is fixed to the side surface of the floor joist 3 with a common connector such as a screw (not shown).

As shown in FIG. 1, the floor beams 4 and the floor joists 3 are both long plate-shaped, and the longitudinal direction is arranged perpendicular to gravity. , the plate surface is arranged parallel to the direction of gravity (although not shown, the plate surface of the floor joists 4 is also arranged parallel to the direction of gravity as with the floor joists 3). ). Also, the floor beam 4 and the floor joist 3 are fixed by a conventional connector (not shown).

A plate-like soundproofing material 1 is placed on the central part of the plate-like parts 2a of the two connectors 2 fixed to the floor joists 3, with both ends in the longitudinal direction of the plate-like soundproofing material 1 being in contact with each other. In the plate-like soundproof material 1 and the plate-like portion 2a of the connector 2, two holes spaced apart in the longitudinal direction of the plate-like portion 2a are used to form the bolt and nut mechanism 2c. A plate-like soundproof material 1 is fixed to a plate-like portion 2 a of a connector 2 .

Further, the plate-like soundproof material 1 is a laminate of a soft layer 1a and a hard layer 1b, and is fixed to the connector 2 by bringing the soft layer 1a into contact with the plate-like portion 2a of the connector 2. As shown in FIG. Specifically, in this example, the plate-shaped soundproof material 1 is laminated and joined to a soft layer 1a containing an elastic body and having a specific gravity of 1.5 or more and one surface (upper surface) of the soft layer 1a. It has a two-layer laminated structure formed with the hard layer 1b formed by the hard layer 1b.

Since the plate-like soundproof material 1 has the soft layer 1a, it has a predetermined flexibility. Therefore, as shown in FIG. 1, the plate-like soundproofing material 1 is partially fixed by the connecting tool 2 (a part of the plate-like soundproofing material 1 is connected to the floor joists 3 via the connecting tool 2). structure that can move (vibrate) by floor impact sound (vibration of floor beams and/or floor joists) propagated through open areas (non-connected parts) that are not fixed by connectors. have. That is, in the present invention, the floor impact sound propagated from the floor beams and/or floor joists to the plate-shaped soundproofing material via the connectors can be reduced by the damping effect unique to the plate-shaped soundproofing material. Floor impact noise can be reduced by damping (absorbing) the vibration of the material itself.

(1) Plate-shaped soundproof material The plate-shaped soundproof material may have a soft layer and a hard layer laminated and bonded to at least one surface of the soft layer. is not limited to the mode in which is laminated, and may be a mode in which hard layers are laminated on both sides of the soft layer. FIG. 3 is a schematic side view showing another example of the plate-like soundproof material of the present invention. The plate-like soundproof material 11 includes a soft layer 11a containing an elastic body and having a specific gravity of 1.5 or more, and first and second hard layers 11b1 and 11b2 laminated and joined to both surfaces of the soft layer 11a. It has a three-layer laminated structure formed by Among these laminated structures, the two-layer structure is preferable because the vibration of the floor joist can be transmitted directly to the soft layer via the connecting fixtures, and the soundproofing can be improved, and the shear deformation between the hard layer and the soft layer can be increased. From this point of view, it is particularly preferable to fix the soft layer of the two-layer structure by bringing it into contact with the connector.

The shape of the plate-shaped soundproof material is not particularly limited as long as it is plate-shaped, and examples thereof include polygonal shapes such as rectangles and squares, circular shapes, elliptical shapes, multilobed shapes, and star shapes. Among these, a rectangular shape and a quatrefoil shape (cross shape) are preferable because flexibility is easily imparted by fixing with a connector and the desired natural frequency is easily adjusted, and floor beams and / or floor joists ( A rectangular shape is particularly preferable because it is easy to restrain between adjacent floor joists.

The size of the surface shape of the plate-shaped soundproof material (in the case of an anisotropic shape such as a rectangle, the average diameter of the major axis and the minor axis) is about 100 mm or more, for example, 100 to 2000 mm, preferably 200 to 1000 mm (for example, 300 to 300 mm). 800 mm), more preferably about 400 to 700 mm (especially 500 to 600 mm). In the present invention, the natural frequency can be easily adjusted by changing the size of the soundproof material. If the size is too small, there is a risk that the soundproofing will deteriorate.

In particular, in the case of a rectangular shape, the aspect ratio of the major axis to the minor axis (major axis/minor axis) may be 1.5 or more, for example 1.5 to 10, preferably 2 to 8 (eg 3 to 6). , more preferably about 3.5 to 5 (especially 3.7 to 4.5). If the aspect ratio is too small, the effect derived from the rectangular shape may be reduced.

The area ratio of the area where the connector is attached (connection area or connection part that contacts or connects with the connector) is 50% to the entire plate surface (not the surface area, but the entire surface or back surface) of the plate-shaped soundproof material. % or less, for example 1 to 50%, preferably 2 to 30% (eg 3 to 20%), more preferably 5 to 15% (particularly 8 to 12%). If the size of the connecting region is too large, the flexibility of the plate-shaped soundproofing material may be reduced, and the effect of reducing floor impact noise may be reduced, or it may be difficult to attenuate vibrations in the target frequency range. On the other hand, if it is too small, it may be difficult to firmly fix (restrain) the plate-shaped soundproof material to the floor beam and/or the floor joist.

The form of the connection part (connecting part) with the connecting tool can be appropriately selected according to the connection method. For example, when fixing using a combination of screws, bolts and nuts good. The number of connecting holes may be 1 or more, for example, 1 to 10, preferably 2 to 8, more preferably 3 to 6.

The position of the connecting portion (connecting position) can be appropriately selected according to the shape of the plate surface, and is not limited to the end portion. There may be. Moreover, it may be a combination of two or more selected from end portions, substantially central portions, and middle portions. In particular, even when the board surface is rectangular, it is not limited to both ends, and may be substantially in the center or in the middle. Both end portions are preferable because they can improve the soundproofing properties, can easily impart an appropriate mass to the plate-shaped soundproofing material (especially the soundproofing material for wooden objects to be detected), and can improve the soundproofing properties.

In this specification and the scope of claims, both ends of the connection position are not limited to strict ends, but may be a minute area that does not affect the damping performance due to vibration of the plate-shaped soundproof material. There may be regions outside the ends to which the material is attached where the connecting portion is not attached.

In FIG. 4, the connecting positions are both ends, but among the adjacent floor joists 23a and 23b bridged between the floor beams 24 facing each other with a gap, only one floor joist 23a is provided with a plate-shaped soundproof material. 21 is a schematic plan view in which 21 is restrained; FIG. This example is the same as the soundproof floor structure shown in FIG. 1 except that the length of the connector 22 is shortened and the plate-like soundproof material is restrained only to one floor joist 23a. Even if the plate-shaped soundproofing material is restrained only on one floor joist, it is possible to provide the same level of soundproofing as a structure in which the plate-shaped soundproofing material is restrained on both floor joists. Therefore, it is preferable to have a structure in which plate-like soundproofing materials are fixed to both floor joists.

The plate-like soundproofing material may be restrained to the floor joist shown in FIG. From the viewpoint of being easily affected by vibration and being able to improve soundproofing, it is preferable to restrain the floor joists, and particularly preferable to restrain by connecting a connector between adjacent floor joists.

In the plate-shaped soundproofing material restrained by the floor joist, if the plate-shaped soundproofing material has a rectangular shape, the arrangement direction of the plate-shaped soundproofing material is not particularly limited, and the direction perpendicular to the length direction of the floor joist Although it may be arranged in a diagonal direction, it is preferable to arrange it in a direction parallel to the length direction of the floor joist because the length of the plate-shaped soundproofing material can be increased and the soundproofing can be improved. .

In the plate-shaped soundproofing materials restrained by the adjacent floor joists, the arrangement position of the plate-shaped soundproofing materials should be between the adjacent floor joists. It is preferably arranged in the central part between the joists.

The number of plate-shaped soundproofing materials arranged with respect to the floor area may be 1 or more per tatami mat (1.62 m ² ), for example, 1 to 3, preferably 1.5 to 2.5, and more preferably. may be two. FIG. 5 is a schematic plan view of two plate-shaped soundproof materials 31 fixed to one floor joist 33 bridged between floor beams 34 facing each other with a space therebetween. This example is the same as the soundproof floor structure shown in FIG. 1, except that the number of plate-shaped soundproof materials restrained by one floor joist is doubled. Compared with the embodiment shown in FIG. 1, the embodiment shown in FIG. 5 can double the number of plate-like soundproof materials, and can improve sound insulation.

In the plate-shaped soundproofing material constrained by the floor joist, when a single plate-shaped soundproofing material is constrained to one floor joist, it is possible to improve the soundproofing, so the length of the floor joist in the length direction It is preferable to fasten the plate-like soundproof material substantially in the center. On the other hand, as in the embodiment shown in FIG. 5, when a plurality of plate-shaped soundproofing materials are restrained to one floor joist, since the soundproofing can be improved, the plate-shaped The plate-like soundproofing materials may be restrained so that the soundproofing materials are arranged at regular intervals.

The thickness (average thickness) of the plate-shaped soundproof material is, for example, about 1 to 20 mm, preferably 3 to 18 mm, more preferably 5 to 15 mm (especially 8 to 12 mm). If the thickness is too thin, the soundproofing properties may deteriorate, and if it is too thick, the handleability and workability may deteriorate.

(1a) Soft layer The soft layer has a specific gravity of 1.5 or more (eg, 1.5 to 4), for example, 2 to 4, preferably 2.2 to 3.6, more preferably 2.3 to 3.5. (especially 2.5 to 3.4). If the specific gravity is too small, the soundproofing properties of the plate-like soundproofing material against heavy floor impact noise may be lowered.

The soft layer has moderate elasticity and may have a Young's modulus of less than 1 GPa, for example 0.01 to 0.9 GPa, preferably 0.02 to 0.5 GPa, more preferably 0.03 to 0.03 GPa. It is about 0.3 GPa (especially 0.05 to 0.2 GPa). If the Young's modulus is too high, the material may become too hard and the soundproofing properties may deteriorate.

In this specification and the scope of claims, the Young's modulus is determined according to JIS K7171 "Plastics-Determination of flexural properties", and this value is used as the Young's modulus.

The soft layer may contain an elastic body having the above Young's modulus, but it preferably contains a filler in addition to a binder component as an elastic body in order to increase the specific gravity and improve soundproofing.

Examples of binder components include bituminous substances such as asphalt, synthetic resins, rubbers and elastomers. These binder components can be used alone or in combination of two or more. In order for the binder component to exhibit a damping effect, it is usually preferable that the mass per unit area is 4 kg / m ² or more. It is preferable that the binder component contains asphalt in terms of a large effect. The asphalt is not particularly limited, and general asphalt such as natural asphalt, straight asphalt, and petroleum asphalt such as blown asphalt can be used. These asphalts can be used alone or in combination of two or more.

Furthermore, the binder component may contain a soft resin or elastomer component in addition to the asphalt in order to impart flexibility to the soft layer. Examples of soft resin or elastomer components include polyolefins, vinyl polymers (polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate, copolymer, ethylene-ethyl acrylate copolymer, etc.), polyamide, polyester, synthetic rubber (polybutadiene, polyisoprene, styrene-butadiene copolymer, etc.), natural rubber, rosin-based resin (natural rosin, modified rosin, etc.) etc. These soft resin or elastomer components can be used alone or in combination of two or more. Among these soft resin or elastomer components, styrene-diene copolymers such as styrene-butadiene block copolymers are preferred.

In the soft layer, the ratio of the soft resin or elastomer component is, for example, 0 to 100 parts by mass, preferably 1 to 80 parts by mass, and more preferably about 3 to 50 parts by mass with respect to 100 parts by mass of asphalt.

As the filler, an organic filler may be used, but an inorganic filler is preferable because of its high specific gravity. Examples of inorganic fillers include metal particles (powder) of iron, copper, tin, zinc, nickel, stainless steel, iron oxide, ferric oxide, ferric oxide, ferrite, tin oxide, zinc oxide, zinc white, Metal oxide particles such as copper oxide and aluminum oxide, metal salt particles such as barium sulfate, calcium sulfate, aluminum sulfate, calcium sulfite, calcium carbonate, calcium bicarbonate, barium carbonate, and magnesium hydroxide, steelmaking slag, mica, clay, Talc, wollastonite, diatomaceous earth, silica sand, mineral particles such as pumice powder, and the like.

These fillers (particularly inorganic fillers) can be used alone or in combination of two or more. Among these inorganic fillers, iron particles, various iron oxide particles, steelmaking slag particles, (bi)calcium carbonate particles, and the like are preferable.

The shape of the filler (inorganic filler in particular) may be particulate, powdery, amorphous, fibrous, etc., preferably particulate or powdery. The average particle size of the inorganic filler is, for example, about 0.5 mm or less (eg, 0.01 to 0.5 mm), preferably about 0.2 mm or less (eg, 0.05 to 0.2 mm). The use of such a finely divided filler improves molding processability when manufacturing vibration damping materials, and allows a large amount of filler to be uniformly dispersed and blended in the asphalt base material. can improve the areal density and thermal stability of

The ratio of the filler (especially inorganic filler) is, for example, 100 to 2000 parts by mass, preferably 200 to 1800 parts by mass, and more preferably about 300 to 1500 parts by mass with respect to 100 parts by mass of the binder component (especially asphalt). If the amount of the filler is too small, the vibration damping and sound insulating effect will be reduced. The amount of filler is preferably adjusted so that the surface density of the soft layer is 4 kg/m ² or more (especially 8 kg/m ² or more).

When the soft layer contains asphalt, the soft layer is formed of a viscoelastic layer containing asphalt and a fiber layer laminated on at least one side (especially both sides) of the viscoelastic layer from the viewpoint of handleability. It may be a laminate.

The fiber layer may contain a fiber aggregate, but is usually a fabric formed of the fiber aggregate. Fabrics include, for example, woven fabrics, knitted fabrics, nets, paper, and non-woven fabrics. Among these, nonwoven fabrics are preferable from the viewpoint of productivity, adhesion to the damping layer, and the like.

The nonwoven fabric may contain fibers, and examples of fibers include natural fibers (cotton, hemp, etc.), regenerated fibers (rayon, etc.), semi-synthetic fibers (cellulose ester fibers, etc.), synthetic fibers [polyolefin fibers (polyethylene fiber, polypropylene fiber, etc.), styrene fiber, tetrafluoroethylene fiber, acrylic fiber, vinyl alcohol fiber (ethylene vinyl alcohol fiber, etc.), polyester fiber (polyethylene terephthalate, polyethylene naphthalate, etc.) _2-4 alkylene arylate fiber, wholly aromatic polyester fiber such as liquid crystal polyester fiber, etc.), polyamide fiber (aliphatic polyamide fiber such as polyamide 6, polyamide 66, wholly aromatic polyamide fiber such as aramid fiber, etc. ), polyurethane fibers, etc.], inorganic fibers (carbon fibers, glass fibers, etc.), and the like.

These fibers can be used alone or in combination of two or more. Among these fibers, cellulosic fibers such as cotton and rayon, polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyester fibers such as polyethylene terephthalate fibers, and polyamide fibers such as polyamide 6 fibers are widely used. , polypropylene fibers, and polyester fibers (especially polyester fibers) are preferred.

The average fineness of the fibers is about 0.1 denier or more, and may be, for example, about 0.1 to 5 denier, preferably 0.2 to 4 denier, more preferably about 0.5 to 3 denier. If the fineness is too small, the strength may decrease.

The average fiber length of the fibers may be, for example, 10 to 150 mm, preferably 20 to 80 mm, and more preferably about 30 to 60 mm. may From the viewpoint of strength and the like, the nonwoven fabric is preferably a long-fiber nonwoven fabric.

The nonwoven fabric may have a basis weight of 10 g/m ² or more (eg, about 10 to 500 g/m ² ), for example, 10 to 100 g/m ² , preferably 20 to 80 g/m ² , more preferably 25 to 60 g/m 2 . ² (particularly 30 to 50 g/m ² ). If the basis weight is too small, even if a fiber layer is provided, the effect of improving the handling of the asphalt-containing viscoelastic layer may be reduced.

Nonwoven fabrics can be prepared by a conventional method, for example, a process of forming a web containing the above fibers and a process of bonding the web. It can be prepared by processing, spunlace, needle punch, stitch bond method, and the like. Among these methods, the spunbond method is preferable from the viewpoint of strength and the like. In particular, the nonwoven may be a polyester spunbond nonwoven.

The thickness (average thickness) of the fiber layer (each layer when laminated on both sides) may be 0.05 mm or more, for example 0.1 to 1 mm, preferably 0.15 to 0.7 mm, more preferably 0.1 mm to 0.7 mm. It is about 2 to 0.5 mm. If the thickness of the fibrous layer is too thin, the handleability of the viscoelastic layer may deteriorate.

The soft layer may contain additives. Additives include, for example, stabilizers (heat stabilizers such as copper compounds, ultraviolet absorbers, light stabilizers, antioxidants, etc.), fillers (fine particles, etc.), thickeners, foaming agents, flame retardants, plasticizers, agents, antistatic agents, coloring agents, surfactants, dispersants, lubricants, crystallization rate retardants, lubricants, antibacterial agents, insect repellents (anticides, mite control agents, etc.), preservatives (antifungal agents, etc.) ), matting agents, heat storage agents, fragrances, fluorescent whitening agents, wetting agents, and the like. These additives can be used alone or in combination of two or more. The proportion of the additive is 50% by mass or less, preferably 0.01 to 30% by mass, more preferably about 0.1 to 10% by mass, relative to the entire soft layer.

The method for producing the soft layer is not particularly limited. For example, the viscoelastic layer containing asphalt can be produced by heating and mixing asphalt and filler (especially inorganic filler) and molding the mixture into a plate. When blending a soft resin or elastomer component, a filler (especially an inorganic filler) may be added to the premixed mixture of the asphalt and the soft resin or elastomer component. When laminating a fiber layer, the fiber layer may be laminated on the molten viscoelastic layer.

The thickness (average thickness) of the soft layer is, for example, about 1 to 15 mm, preferably about 2 to 12 mm (eg, 3 to 10 mm), more preferably about 5 to 9 mm (especially 7 to 8.5 mm). Furthermore, the thickness (average thickness) of the soft layer is 1 to 20 times the thickness (average thickness) of the hard layer (when the hard layers are laminated on both sides of the soft layer, the thickness of each layer), preferably 3 to 15 times. times, more preferably about 5 to 13 times (especially 8 to 12 times). If the thickness of the soft layer is too thin, the soundproofing property may deteriorate, and if it is too thick, the handleability and workability may deteriorate.

(1b) Hard layer The hard layer may be harder than the soft layer, and may have a Young's modulus of 1 GPa or more, for example, 1 to 500 GPa, preferably 50 to 400 GPa, more preferably 100 to 300 GPa (especially 150 to 250 GPa). If the Young's modulus is too small, the strength will decrease and the soft layer will not be supported firmly, so there is a risk that the soundproofing will decrease.

The hard layer may be formed of a hard material having the above Young's modulus, and is usually formed of an inorganic material such as metal, gypsum, glass, ceramic, or carbon material, or an organic material such as plastic or wood material. Among these materials, metals, plastics, and wood materials are widely used because of their excellent strength and handling properties.

The material of the metal is not particularly limited, and examples thereof include aluminum, iron, nickel, copper, and chromium. The metal may be the single metal or an alloy of the metal (for example, stainless steel, steel, etc.). Furthermore, the surface of the metal may be subjected to a plating treatment such as zinc plating for rust prevention treatment. Among these, iron-containing metals are commonly used, and plated iron is preferred.

Examples of plastics include conventional hard plastics such as (meth)acrylic resins, polypropylene resins, hard vinyl chloride resins, polyesters, polycarbonates, polyamides, polyacetals, and the like. Among these plastics, (meth)acrylic resins such as polymethyl(meth)acrylate and polypropylene resins such as polypropylene are widely used.

Examples of wood materials include solid wood, plywood (laminated wood board), wood fiber board (MDF, particle board, oriented strand board, insulation board, etc.).

Among these, metals such as iron are preferable because they have high strength and mass and can improve the bearing capacity and soundproofing properties of the soft layer.

The thickness (average thickness) of the hard layer can be selected from a range of about 0.1 to 5 mm (especially 0.2 to 3 mm), but when the hard layer is made of metal, it is preferably 0.2 to 1.2 mm. , More preferably about 0.3 to 1 mm (especially 0.5 to 0.9 mm), and when the hard layer is made of plastic, preferably 0.5 to 2 mm, more preferably 0.7 to 1 mm 0.5 mm. If the thickness of the hard layer is too thin, the soundproofing properties may deteriorate and the strength for supporting the soft layer may be insufficient.

The hard layer is not limited to being laminated on both sides of the soft layer, and may be laminated on at least one side of the soft layer. When the hard layer is laminated on one side of the soft layer, the hard layer may be laminated on either side. It is preferably arranged on the upper side. Among these, it is particularly preferable to form the hard layer on one side of the soft layer because it can improve soundproofing with a simple structure.

The hard layer and the soft layer are joined to such an extent that the hard layer and the soft layer can vibrate together when floor impact sound propagates through the plate-like soundproof material. The joining of both layers is not particularly limited as long as both layers can be integrated, and a conventional method, for example, a method of joining using an adhesive or pressure-sensitive adhesive, nails, screws, bolts, clips or other engaging means (fixing a method of joining using a tool), and the like. Among these methods, it is preferable to use an adhesive to interpose an adhesive layer between the hard layer and the soft layer because the bonding can be performed by a simple method.

Usable adhesives include, for example, epoxy adhesives, urethane adhesives, ethylene-vinyl acetate adhesives, silicone adhesives, and the like. Of these, silicone-based adhesives (for example, modified silicone-based adhesives, etc.) are preferred from the viewpoint of adhesiveness and the like. The adhesive is preferably an adhesive that does not contain a solvent that dissolves the elastic body of the soft layer.

The thickness (average thickness) of the adhesive layer is, for example, about 1 to 2000 μm, preferably about 15 to 1000 μm, more preferably about 50 to 500 μm (particularly about 100 to 300 μm). If the thickness of the adhesive layer is too thin, the adhesive strength will decrease, and there is a risk that the soft layer and the hard layer will separate during vibration.

(2) Floor beams and floor joists Usual floor beams and floor joists can be used as the floor beams and floor joists. It is bridged by The interval between adjacent floor joists can be selected from a range of about 100 to 1500 mm depending on the type of building. In general, they are arranged at intervals of about 910 mm.

The material of the floor beams and floor joists may be either an inorganic material or an organic material.

Examples of inorganic materials include metallic materials (eg, aluminum, iron, stainless steel, steel, etc.) and metallic compound materials (eg, gypsum, calcium silicate, glass, etc.). These inorganic materials can be used alone or in combination of two or more. Among these inorganic materials, metallic materials such as iron and aluminum are preferable.

Examples of organic materials include wood materials [e.g., solid wood, plywood (laminated wood board), laminated wood, wood fiber board (medium density fiberboard MDF, particle board, oriented strand board, insulation board, etc.), etc. ], hard fiber board (heat-set needle felt, paper board, etc.), synthetic resin materials (e.g., polyethylene, polypropylene, polystyrene, polyvinyl chloride resin, polymethyl methacrylate, polyester, polycarbonate, polyamide, etc.), etc. mentioned. These organic materials can be used alone or in combination of two or more. Among these organic materials, wood materials are preferable because they can achieve both lightness and strength.

Among these, wood materials such as solid wood and metal materials such as iron are widely used, and wood materials having both lightness and strength are preferable.

The shape of the floor joist may be any long shape that can be spanned over the surrounding frames (pillars) under the floor of the room for forming the floor and can support the flat plate-shaped underfloor material. The cross-sectional shape (cross-sectional shape perpendicular to the longitudinal direction) of the floor joist includes, for example, a hollow or solid quadrangular shape (square, rectangular, trapezoidal, etc.), an I-shape, a U-shape, and the like. Among these, it is preferable to use a solid and square cross-sectional shape (rectangular cross-sectional shape) such as a square or rectangular shape. The cross-sectional shape of the floor joist is also the same as the cross-sectional shape of the floor joist, including preferred embodiments.

The width of the floor beams and floor joists is, for example, about 10 to 500 mm, preferably 20 to 100 mm, more preferably 30 to 50 mm (especially 35 to 40 mm). The thickness (height) of the floor beams and floor joists is, for example, about 10 to 500 mm, preferably 50 to 400 mm, more preferably 100 to 300 mm (especially 200 to 250 mm).

(3) Connectors Connectors are interposed between the floor beams and/or floor joists and the plate-shaped soundproofing material, and connect a partial region of the floor beams and/or the floor joists and the plate-shaped soundproofing material. It is not particularly limited as long as the floor beam and/or the floor joist and the plate-shaped soundproofing material can be restrained (fastened or fixed) by joining (connecting) a partial area of the surface, and floor beams and floor joists A commonly used connector can be used depending on the material of the plate-like soundproof material.

The connecting member may be made of any material as long as it can firmly fix the plate-shaped soundproofing material to the underfloor material and transmit floor impact sound (vibration of floor beams and/or floor joists) to the plate-shaped soundproofing material. Although the hard materials exemplified in the above section can be used, wood materials such as plywood and metals are widely used, and metals containing iron are preferable because of their high strength and rigidity.

As a connection method using a connector, for example, a connection hole is formed in a plate-shaped soundproof material, and a conventional connector (a connector having a connection structure having a bolt-nut mechanism, etc.) is used by using the connection hole. , screws, etc.), and if the surface of the plate-shaped soundproofing material or underfloor material is made of metal, it is fixed by welding with a connector made of metal (such as a metal pillar). It is also possible to use a method such as

The shape of the connector is not particularly limited as long as it can connect a partial area of the floor beam and/or floor joist and a partial area of the plate-shaped soundproofing material. In order to improve the strength and durability, a side view U-shape formed by a long plate-like portion and side wall portions extending perpendicularly to the plate surface from both ends in the longitudinal direction of the plate-like portion. Shape is preferred. In the U-shape, the side walls may extend upward or downward with respect to the plate surface. It is preferable to let The length of the plate-like portion can be selected according to the spacing of the floor joists, and the height of the side wall portion can be appropriately selected according to the thickness of the floor joists.

(4) Underfloor material In the soundproof floor structure of the present invention, an underfloor material may be arranged on the floor joist that spans between the floor beams facing each other. As the underfloor material, various underfloor materials can be used according to the type of building. Examples of the underfloor material include concrete slabs in reinforced concrete buildings, lightweight foamed (cellular) concrete (such as ALC concrete, which is lightweight cellular concrete cured in an autoclave), deck concrete, precast concrete, and the like. Examples include wooden floors used in traditional wooden houses. In the present invention, since the soundproofing plate is fixed to the floor beam and/or the floor joist, it is not necessary to fix the soundproofing plate to the underfloor material such as ALC concrete. It does not reduce the workability of

In addition, underfloor materials can be used on concrete slabs and wooden floors, as well as tatami floors, plastic boards, plywood, wooden boards, paper, woven or non-woven fabric sheets, inorganic boards (gypsum boards, calcium silicate boards, etc.), and metals. A plate or the like may be laminated. Considering fire resistance, it is preferable to use a gypsum board.

[Soundproofing method]
In the soundproofing method of the present invention, a plurality of floor beams including one or more sets of floor beams that face each other with a gap and that are parallel to each other in the length direction, and a pair of floor beams intersecting perpendicularly to the floor beams between the opposing floor beams. In the floor including the floor joists spanned by the floor joists, by attaching a part of the plate surface of the plate-shaped soundproof material to the connector, the plate-shaped soundproof material is connected to the floor joist via the connector and/or by restraining the floor joist to the floor joists, the floor impact sound propagated from the floor beams and/or the floor joists to the plate-like soundproofing material via the connector is converted into the vibration energy of the plate-like soundproofing material, soundproof the

In the soundproofing method of the present invention, floor impact noise in a wide frequency range can be reduced by adjusting the natural frequency of the plate-shaped soundproofing material. In particular, since the plate-like soundproofing material includes a soft layer with a high specific gravity, it may have a natural frequency suitable for damping heavy floor impact noise. Specifically, the natural frequency of the plate-like soundproof material may be, for example, 1 to 100 Hz, preferably 5 to 50 Hz, more preferably 8 to 40 Hz (especially 10 to 30 Hz).

The natural frequency of the plate-like soundproofing material may be controlled, for example, by adjusting the size and thickness of the plate-like soundproofing material and the connecting position of the connector. For example, in the method of adjusting the size and thickness of the plate-shaped sound-insulating material, the natural frequency may be adjusted to be large by increasing the thickness of the soft layer. By doing so, the natural frequency may be adjusted to be low. In the method of adjusting the connection position of the connector, for example, the length of the rectangular shape may be changed by eccentrically moving the connection position of the rectangular plate-shaped soundproof material in the longitudinal direction from the central portion.

In the present invention, by combining these methods, the plate-like soundproof material can be adjusted to the desired natural frequency. Among these methods, from the viewpoint of excellent soundproofing (especially soundproofing of wooden buildings), workability, and durability, both ends of the rectangular plate-shaped soundproofing material in the length direction are restrained with connectors, A method of adjusting to a predetermined size and thickness is preferred.

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples. The evaluation of the examples was measured by the method shown below.

[Natural vibration]
A 20 mm thick particle board is fixed with bolts to an iron table (dimensions: 1000 × 1000 mm, mass: 86 kg) on a vibration generator ("G-5230NS" manufactured by Shinken Co., Ltd.), 38×450×thickness 19 mm), fixed with screws on a particle board, and the natural frequency (Hz) of the specimen was measured. The excitation conditions were an acceleration of 0.5 G, a swept sine wave with a frequency range of 5 to 200 Hz, and a sweep speed of 1 oct/min, and the acceleration was measured using an FFT analyzer and a vibration pickup. A vibration pickup was attached to the center of the specimen, and the frequency at maximum acceleration was taken as the natural frequency.

[Floor impact sound test on 2x4 construction floor]
A two-by-four construction floor was constructed in the opening (dimensions 2740 x 3650 mm) of the acoustic laboratory (volume 61.6 m ³ , floor slab thickness 250 mm), and the sound source had the standard weight impact characteristics specified in JIS A 1418-2: 2000. The floor impact sound level was measured at 5 impact points and 5 sound receiving points. In addition, in the two-by-four construction floor, the floor is composed of floor joists: 210 materials [455 mm interval], tongue plywood 15 mm thick, and the independent ceiling is composed of ceiling joists: 206 materials, gypsum board 12.5 mm thick, Glass wool of 50 mm [density: 24 kg/m ³ ] was inserted in the space above the ceiling.

[Example 1]
A modified silicone resin adhesive (Konishi "For High-Performance Concrete" manufactured by Co., Ltd.) was applied with a bar coater so that the thickness after curing was 0.3 mm. Further, a galvanized iron plate (900 mm long×200 mm wide×0.8 mm thick) was laminated on the uncured adhesive, and the adhesive was cured to produce a plate-shaped soundproof material.

[Example 2]
A plate-shaped soundproof material was manufactured in the same manner as in Example 1, except that iron plates were laminated on both sides.

[Example 3]
A modified silicone resin adhesive was applied to one surface (upper side) of an asphalt damping material (length 710 mm, width 210 mm, thickness 8 mm) with a bar coater so that the thickness after curing was 0.3 mm. Further, a galvanized iron plate (700 mm long×200 mm wide×0.8 mm thick) was laminated on the uncured adhesive, and the adhesive was cured to produce a plate-shaped soundproof material.

[Example 4]
A plate-shaped soundproof material was manufactured in the same manner as in Example 3, except that iron plates were laminated on both sides.

[Example 5]
A modified silicone resin adhesive was applied to one surface (upper side) of an asphalt damping material (length 510 mm, width 210 mm, thickness 8 mm) with a bar coater so that the thickness after curing was 0.3 mm. Further, a galvanized iron plate (500 mm long×200 mm wide×0.8 mm thick) was laminated on the uncured adhesive, and the adhesive was cured to produce a plate-shaped soundproof material.

[Example 6]
A plate-shaped soundproof material was manufactured in the same manner as in Example 5, except that iron plates were laminated on both sides.

Table 1 shows the results of measuring the natural frequencies of the plate-shaped soundproof materials obtained in Examples 1 to 6.

As is clear from the results in Table 1, the eigenfrequency of the plate-shaped soundproofing material of the present invention can correspond to the eigenfrequency of the underfloor material and floor joists by adjusting each parameter. When constructed, it is possible to take measures against heavy floor impact noise.

[Example 7]
On both sides of the asphalt-based damping material (“Asphalt Sheet” manufactured by Nanao Industries Co., Ltd., specific gravity 2.8, length 820 mm x width 190 mm x thickness 8 mm), a modified silicone resin adhesive (manufactured by Konishi Co., Ltd. “High For Performance Concrete”) was applied with a bar coater so that the thickness after curing was 0.3 mm. Further, a galvanized iron plate (length 810 mm, width 180 mm, thickness 0.8 mm) was laminated on the uncured adhesive, and the adhesive was cured to produce a plate-shaped soundproof material. Two holes (intervals of 65 mm - 60 mm - 65 mm) are formed at positions 65 mm from both ends along lines extending in the width direction at positions of 30 mm and 790 mm in the length direction of the resulting plate-shaped soundproof material. Thus, a total of four holes were formed. Iron U-shaped angle (a U-shaped connecting tool when viewed from the side, the length of the plate-shaped part is 355 mm, the height of both side walls extending vertically from both ends of the plate-shaped part is 50 mm, the width is 50 mm, and the thickness is 3.2 mm ) along the longitudinal axis of the plate-shaped part, two holes (147.5 mm - 60 mm - 147.5 mm intervals) are formed at positions 147.5 mm from both ends, and the plate-shaped soundproof material The holes of the U-shaped angle correspond to each other, and the two U-shaped angles are fixed to the plate-shaped soundproofing material with bolts and nuts. A total of 12 U-shaped angles were fixed to produce a plate-shaped soundproofing material, and by fixing the side walls of the steel U-shaped angles to the floor joist of the two-by-four construction method floor using screws, the floor joist Two plate-shaped soundproofing materials were detained.

[Example 8]
A modified silicone resin adhesive was applied to one side (upper side) of an asphalt damping material (length 870 mm, width 210 mm, thickness 8 mm) using a bar coder so that the thickness after curing was 0.3 mm. Further, a galvanized iron plate (length 860 mm×width 200 mm×thickness 0.8 mm) was laminated on the uncured adhesive, and the adhesive was cured to produce a plate-shaped soundproof material. It was restrained to a floor joist in the same manner as in Example 7, except that the obtained plate-shaped soundproof material was used.

[Example 9]
The plate-like soundproofing materials were fixed to the floor joists in the same manner as in Example 8, except that a total of six plate-like soundproofing materials were used.

[Comparative Example 1]
In the same manner as in Example 7, only the steel U-shaped angle was fastened to the floor joist without using the plate-like soundproof material.

[Comparative Example 2]
Two holes (65mm-60mm-65mm interval). The holes of the iron Z-shaped angle correspond to the plate-shaped soundproofing material having four holes obtained in Example 7, and the two iron Z-shaped angles are fixed to the plate-shaped soundproofing material with bolts and nuts. did. A total of 12 Z-shaped angles were fixed to form a plate-shaped soundproofing material, and the 30 mm vertical portions of the iron Z-shaped angles were fixed at equal intervals to plywood tongues of the two-by-four construction method floor using screws.

Table 2 shows the results of measuring the floor impact sound levels in Examples 7-9 and Comparative Examples 1-2. Table 2 also shows the results of evaluation in terms of the amount of reduction from the floor impact sound level in a blank (an example in which no plate-like soundproofing material and angles are used) in the 63 Hz band.

As is clear from the results in Table 2, in the two-by-four construction floor, a greater reduction effect was observed when the plate-shaped soundproofing material was restrained to the floor joists rather than to the plywood. Moreover, it was recognized that the amount of reduction greatly changed by changing the dimensions although the configuration was the same. Furthermore, it was confirmed that the iron U-shaped angle between the floor joists alone did not have a significant reduction effect, and that the plate-shaped soundproofing material contributed greatly to the reduction effect.

In particular, in Example 8, a reduction amount of 5.2 dB was observed. The amount of weight floor impact sound level reduction of 5 dB or more in the 63 Hz band is ΔLH-4, which is the highest grade in the “ΔLH grade” widely used as a method of classifying the reduction performance of floor impact noise for floor materials, and is remarkable. I was able to confirm the soundproofing performance.

The soundproof floor structure of the present invention can be used for the floor structure of buildings such as condominiums, buildings, and general houses. It can be used as a floor structure for the above floors, and it can significantly improve workability, durability, and soundproofing. It is particularly useful as a floor structure for floors of two or more floors (especially two-by-four construction floors).

DESCRIPTION OF SYMBOLS 1, 11, 21, 31... Plate-shaped soundproof material 1a, 11a... Soft layer 1b, 11b1, 11b2... Hard layer 2, 22... Connector 2a... Plate-like part 2b... Side wall part 2c... Bolt nut mechanism 3, 23a, 23b, 33... Floor joist 4... Floor beam

Claims (7)

a plurality of floor beams including one or more sets of floor beams that face each other with a distance parallel to each other in the longitudinal direction;
a floor joist bridged between the floor beams facing each other across the floor beams ;
A soundproof floor structure including a plate-shaped soundproof material that is restrained by the floor joist via a connector and has a partial area of the plate surface attached to the connector,
The connector is fixed by crossing over the floor joists between the adjacent floor joists, and the plate-like soundproof material is placed on the connector and fixed. and
In the plate-shaped soundproof material, the area ratio of the region where the connector is attached is 50% or less with respect to the entire plate surface,
A soundproof floor structure in which the plate-shaped soundproof material includes a soft layer containing an elastic body and having a specific gravity of 1.5 or more and a hard layer laminated and joined to at least one surface of the soft layer. A plurality of floor joists are spanned in parallel and spaced apart between opposing floor joists, a plate-shaped soundproofing material is disposed between the adjacent floor joists, and two or more connectors connect the floor joists with each other. 2. The soundproof floor structure according to claim 1 , wherein the soundproof floor structure is fixed to a joist. 3. The soundproof floor structure according to claim 2 , wherein the plate-like soundproof material has a rectangular plate surface, and the lengthwise direction of the plate surface is parallel to the lengthwise direction of the floor joists. 4. The soundproof floor structure according to claim 3 , wherein the plate-like soundproof material is fixed to the connecting members at both longitudinal ends of the plate surface. The plate-shaped soundproofing material is a laminate of a soft layer containing asphalt as an elastic body and a hard layer formed of metal and laminated and bonded to one side of the soft layer, and has a natural frequency of 5 to 50 Hz. The soundproof floor structure according to any one of claims 1 to 4 . The soundproof floor structure according to any one of claims 1 to 5 , which is a floor structure of a wooden building. a plurality of floor beams including one or more sets of floor beams that face each other with a distance parallel to each other in the longitudinal direction;
a floor joist bridged between the floor beams facing each other across the floor beams ;
A soundproofing method for a floor including a plate-shaped soundproofing material restrained by the floor joist via a connector and having a partial area of the plate surface attached to the connector ,
The connector is fixed by crossing over the floor joists between the adjacent floor joists, and the plate-shaped soundproof material is placed on the connector and fixed,
In the plate-shaped soundproof material, adjusting the area ratio of the region where the connector is attached to 50% or less of the entire plate surface ,
A soundproofing method using, as the plate-shaped soundproofing material, a soundproofing material comprising a soft layer containing an elastic body and having a specific gravity of 1.5 or more and a hard layer laminated and joined to at least one surface of the soft layer. .

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