JP2001348985A - Damping member for wooden unit building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damping member for a wooden unit building, which is capable of preventing the slippage and falling of a steel plate even though it is installed to a vertical surface and also eliminating the transmission of floor impact sound from the upstairs to the downstairs by interposing and inserting a plurality of the building units between side surfaces of a floor structural body of neighboring upstair building units of the wooden unit building formed by assembling plural building units in the up-down and horizontal directions. SOLUTION: The damping member for erecting the wooden unit building is formed with alternately laminated bodies of cross-linking acrylic-based resin layers 18a and plate-shaped layer 18b, a tensile elastic modulus of the cross- linking acrylic-based resin is 0.1 to 10 MPa, a loss tangent (tan δ) is more than 0.2, and the insoluble matter of tetrahydrofuran is higher than 50 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping material for a wooden unit building.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping structure of a floor structure employed in a unit building, for example, a rubber damping material having rubber elasticity is interposed between girders of units constituting buildings adjacent to each other. By doing so, a method has been proposed in which the vibration at the time of floor impact is attenuated by the elastic deformation of the damping material, and the floor impact sound generated on the upper floor is reduced from being transmitted to the lower floor (JP-A-8-302829). Gazette).

However, in the above method, since the floor impact noise reduction level differs depending on the type of the vibration damping material having rubber elasticity, the impact noise level reduction effect described in the embodiment is 1d.
In B, the weight floor impact sound level L65 specified in JIS A1419 was the limit.

[0004] Further, since the steel plate constituting the vibration damping material is installed in the vertical direction, the steel plate may slip down due to its own weight. Furthermore, if the gap between the side surfaces of the floor structure of adjacent building units is large, the connection between the building units and the damping material becomes insufficient, and the efficiency of transmitting the vibration of the building unit upon floor impact to the damping material is reduced. In some cases, the effect of reducing the floor impact sound level was insufficient.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wooden unit building formed by assembling a plurality of building units vertically and horizontally, between the side surfaces of a floor structure of an adjacent upper-floor building unit. By inserting it, even if it is constructed on a vertical surface, there is no slippage of the steel plate, the floor impact sound of the upper floor is reduced to be transmitted to the lower floor, and the wooden floor that can increase the heavy floor impact sound level to L60 An object of the present invention is to provide a vibration damping material for a system unit building.

[0006]

According to the present invention, there is provided a vibration damping material for a woody unit building, which comprises a plurality of building units vertically and horizontally assembled in an upper floor building unit adjacent to a woody unit building. A vibration damping material interposed between the side surfaces of the floor structure, which is formed from an alternating laminate of a crosslinked acrylic resin layer having a thickness of 0.5 to 10 mm and a hard plate-like layer having a thickness of 0.1 to 3 mm, The laminate has at least two crosslinked acrylic resin layers, the crosslinked acrylic resin has a tensile modulus of 0.1 to 10 MPa, a loss tangent (tan δ) of 0.2 or more, and a tetrahydrofuran-insoluble component. Is 50% by weight
It is characterized by the above.

Hereinafter, the present invention will be described in detail. The vibration damping material of the present invention is formed of an alternate laminate of a crosslinked acrylic resin layer 18a and a plate-like layer 18b, for example, as shown in a schematic sectional view of FIG. The cross-linked acrylic resin layer 18a is preferably laminated on both outermost layers. The number of layers of the crosslinked acrylic resin layer 18a and the hard plate-like layer 18b is appropriately determined according to a required level of a heavy impact sound level or the like.

[0008] The thickness of the hard plate-like layer is limited to 0.1 to 3 mm. When the thickness is less than 0.1 mm, the flexural rigidity of the damping material becomes low, and the vibration of the building unit at the time of floor impact cannot be sufficiently attenuated. Because of the heavy weight, handling during construction deteriorates.

Examples of the material used for the hard plate-like layer include a metal plate such as an iron plate, a stainless plate and an aluminum plate; a synthetic resin plate such as polyethylene, polypropylene and vinyl chloride resin; and an inorganic material plate such as slate. It is used, but is economically a rust-proof iron plate, for example, a galvanized rolled steel plate.

For the crosslinked acrylic resin layer, it is preferable to use a crosslinked acrylic resin plate, the thickness of which is limited to 0.5 to 10 mm, preferably 1 to 5 mm.
It is. If the thickness of the cross-linked acrylic resin layer is less than 0.5 mm, the vibration of the building unit at the time of floor impact cannot be sufficiently attenuated, so that the floor impact sound reduction level is lowered, and
If it exceeds 0 mm, manufacturing becomes difficult.

The crosslinked acrylic resin layer has a tensile modulus of 0.1 to 10 MPa and a loss tangent (tan δ) of 0.2 or more. Tensile modulus and loss tangent (tan)
If δ) is out of the above range, it becomes impossible to sufficiently reduce the floor impact sound level. The tensile modulus and the loss tangent (tan δ) are values measured by a dynamic viscoelasticity test.

The acrylic resin is preferably a polymer obtained by polymerizing an alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms as a main component, more preferably an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms. ) Acrylate. Examples of such an alkyl (meth) acrylate include ethyl acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isooctyl (meth) acrylate.

The acrylic resin is an alkyl (meth)
An acrylate may be obtained by copolymerizing an unsaturated monomer other than the alkyl (meth) acrylate.
Examples of the unsaturated monomer copolymerizable with the alkyl (meth) acrylate include carboxy group-containing vinyl monomers such as acrylic acid, itaconic acid, and maleic acid; 2-hydroxy (meth) acrylate, 2-hydroxypropyl (meth) acrylate And hydroxyl-containing (meth) acrylate monomers such as acrylonitrile, N-vinylpyrrolidone, and N-vinylcaprolactam.

A crosslinked acrylic resin is used in order to keep the tensile elastic modulus and the loss tangent (tan δ) of the acrylic resin within the above ranges. The acrylic resin,
The component ratio between the alkyl (meth) acrylate and the unsaturated monomer is preferably from 80:20 to 97: 3 (weight ratio). In order to crosslink the acrylic resin, the alkyl (meth) acrylate and the unsaturated monomer are used. It is preferable to add a cross-linking agent at the polymerization stage to cross-link polymer chains constituting the acrylic resin.

As the cross-linking agent, it is preferable to use a vinyl monomer having two or more radically polymerizable double bonds in the molecule. Examples of such a vinyl monomer include hexanediol di (meth) Examples include acrylate, (poly) ethylene glycol (meth) acrylate, (poly) propylene glycol (meth) acrylate, and pentaerythritol di (meth) acrylate.

When a monomer containing a carboxyl group or a hydroxyl group is used as a component of the acrylic resin, it is preferable to use an isocyanate compound, an aziridine compound, or an epoxy compound as a crosslinking agent. Specific examples of the crosslinking agent include tolylene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HMDI), 1,6-hexamethylene diethylene urea, and 1,5-pentamethylene diethylene urea. , Ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether and the like.

The gel fraction represented by tetrahydrofuran (hereinafter referred to as THF) insolubles in the crosslinked acrylic resin is limited to 50% by weight or more. THF insoluble content is 50
When the amount is less than the weight%, the hard plate-like layer constituting the vibration damping material of the present invention may slip off.

A filler such as glass balun, glass beads, polyolefin beads, or fly ash may be added to the above-mentioned crosslinked acrylic resin within a range that does not adversely affect the tensile modulus and loss tangent (tan δ).

The above-mentioned crosslinked acrylic resin plate can be produced by various production methods, but is preferably produced by ultraviolet curing. Specifically, first, a photopolymerization initiator (for example, 2,
2-dimethoxy-2-phenylacetophenone) is added, and the resulting ultraviolet-curable composition is freed of dissolved oxygen by an inert gas (such as nitrogen). Next, the ultraviolet curable composition was cast on a release-treated polyethylene terephthalate (hereinafter referred to as PET) film, and immediately thereafter, a release-treated PET film was coated thereon to block air (oxygen). Thereafter, the crosslinked acrylic resin plate is obtained by irradiating ultraviolet rays to cure.

The above-described production method by ultraviolet curing not only has excellent safety because it is a solventless process, but also has a thickness of 0.5.
It is possible to manufacture a crosslinked acrylic resin plate having a thickness exceeding 1 mm with high productivity.

In the alternate laminate, a crosslinked pressure-sensitive adhesive is preferably used in order to alternately laminate and fix the crosslinked acrylic resin layer and the hard plate-like layer. As the cross-linkable pressure-sensitive adhesive, a gel fraction represented by a THF-insoluble component of 5 is used.
It is preferable to use an adhesive of 0% by weight or more. Either an acrylic or rubber-based cross-linkable pressure-sensitive adhesive can be used. However, from the viewpoint of easy design of THF-insoluble components and durability, acrylic It is preferable to use a crosslinked type pressure-sensitive adhesive of a system.

The above-mentioned cross-linkable pressure-sensitive adhesive may be directly applied to the cross-linked acrylic resin layer and the hard plate-like layer and laminated.
A sheet-type adhesive obtained by casting a solvent-type or emulsion-type cross-linkable pressure-sensitive adhesive on release paper may be attached and laminated. Further, the crosslinked acrylic resin layer and the hard plate-like layer may be laminated by a hot melt type adhesive.

The thickness of the crosslinked pressure-sensitive adhesive applied is 20
１００100 μm is preferable, and it is preferable to apply it to the entire surface to be coated. When the coating thickness is less than 20 μm, the reliability of adhesion is reduced. When the coating thickness is more than 100 μm, the productivity of the alternate laminate is deteriorated.

When the vibration of the building unit at the time of floor impact is transmitted to the vibration damping material composed of the above-mentioned alternate laminate, the hard plate-like layer becomes a constraining layer, and the vibration is efficiently converted to an acrylic resin layer having a high vibration damping property. Can tell. In addition, since it is a laminate with a hard plate-like layer, the rigidity of the entire adjacent building unit can be increased, the initial vibration level at the time of floor impact can be suppressed, and the floor impact sound level is reduced. growing.

The outermost layers of the above-mentioned alternate layered body are, for example, shown in FIG.
As shown in the figure, a plate 21 larger than the size of the alternate laminate 18 is attached and inserted between the beams (not shown) of the building units adjacent to each other, and then the beams of both units and the plate 21 are nailed. Alternatively, the vibration of the building unit at the time of floor impact can be reliably transmitted to the vibration damping material by fixing with a screw. When the alternate laminates 18 are fixed to both beams, nailing or screwing is performed on the end of the plate 21 to which the alternate laminates 18 are not attached (the portion indicated by the mark x in FIG. 3). A plywood, a thin metal plate, or the like is used for the plate 21.

(Operation) In the present invention, a vibration damping material in which a crosslinked acrylic resin layer having rubber elasticity is laminated is interposed between floor girders of a floor structure of an adjacent upper floor building unit. Vibration at the time of floor impact of the upper-floor building unit is reduced by attenuating energy due to rubber elastic viscoelastic deformation of the damping material provided between the floor girders. Therefore, the floor impact sound on the upper floor is extremely low in the room on the lower floor. Since this vibration is absorbed between the floor girders, which are the main skeleton of the building unit, the vibration of the entire building unit is absorbed, and the efficiency is improved as compared with the conventional method of partially absorbing floor beams or the like.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

FIG. 4 is a perspective view showing the entire structure of a unit building to which the wood-based unit building damping material of the present invention is applied. FIG. 5 is a perspective view showing a frame structure of each building unit constituting the wooden unit building, FIG. 6 is an exploded perspective view showing a method of attaching a damping material between floor girders, and FIG.
4 shows a floor structure on an upper floor in a unit building, and FIG.
FIG. 3 is a cross-sectional view taken along line AA of FIG.

In order to increase the rate of industrial production of a unit building, a single building is preliminarily divided into several units and factory-produced, and these are constructed and constructed at a construction site.
It is a building that is assembled. That is, as shown in FIG. 4, the unit building is provided with a plurality of lower-floor building units 2a, 2b,... Floor building unit 2a,
The upper-floor building units 3a, 3b,.
・ ・ Assemble with corresponding arrangement. The building units 2a, 3a,... Vertically and horizontally adjacent to each other are connected to each other, and
The roof units 4a, 4b,
... is attached. Partition walls are provided in the upper-floor building units (3a, 3b) and the lower-floor building units 2a, 2b constructed and assembled in this manner, thereby forming each room portion such as a living room, a dining room, and a bedroom.

The building units 2a, 2b, 3
a and 3b are formed by combining a plurality of structural materials into a substantially rectangular parallelepiped shape so as to be transportable. That is, the upper-floor building units 3a and 3b and the lower-floor building units 2a and 2b
As shown in FIG. 5, pillars 5, 5, 5, 5 made of 2 × 4 (two-by-four) wood are erected at the four corners. Pillars 5 and 5 facing each other
2 and 10 (two-by-ten) wood girder floor girders 6 and 6 are disposed between the lower end portions of the pillars. X4 timber floor girders 7, 7 are provided.

On the other hand, girders 8 and 8 made of 2 × 4 wood are arranged between the upper ends of the columns 5 and 5 facing each other in the X direction among the columns 5 and 5 that are erected. In addition, between the upper ends of the pillars 5 and 5 opposed to each other in the Y direction, there are provided girder ceiling girders 9 and 9 made of 2 × 4 wood. A stud 1 is provided between each of the girder floor girders 6 and the girder ceiling girders 8 opposing each other.
0 is interposed.

A plurality of floor beams 11, 11,... Made of wood are provided between a pair of opposite girders 6 and 6.
They are arranged at a predetermined interval in the X direction.
Further, a plurality of joists 14, 1 are provided above the floor beams 11, 11,.
Are arranged at a predetermined interval from each other in the Y direction. On the other hand, a pair of girders 8 and 8
Are interposed at a predetermined interval in the X-direction. A ceiling panel (not shown) is adhered to the lower surface of each ceiling beam 17, thereby forming the ceiling of the building unit.

As described above, the building units 2a, 3a,... Of the lower and upper floors having such a structure are placed on the foundations 1, 1,. As shown in FIG. 7, each of the building units 2a, 3a,.
・ ・ Connect the floor members 16 of the floor structure to each other to complete the unit building. In the completed unit building, the building unit 3a on the upper floor adjacent on the girder side
As shown in FIG. 6, a girder floor girder 6 forming one building unit 3a (3a) and a girder floor girder 6 forming the other building unit 3a (3a) are located between 3a (3b, 3b). Are arranged opposite to each other with a predetermined space (about 20 mm in this example), and three damping members D, D, D are provided between these girder floor girders 6, 6 at a predetermined interval. It is inserted by opening. As the vibration damping material D, a material obtained by laminating structural plywood on both outermost layers of the alternate laminate shown in FIG. 3 was used.

Similarly, between the building units 3a and 3b on the upper floor adjacent on the wife side, the girder bridge 7 constituting one building unit 3a and the girder bridge 7 constituting the other building unit 3b are formed. , A predetermined space (in this example, about 20 m
m), two damping members D, D are interposed between these girder beams 7, 7 at a predetermined interval.

Example 1 Preparation of Crosslinked Acrylic Resin Board 85 parts by weight of n-butyl acrylate, 15 parts by weight of acrylic acid, hexanediol diacrylate (crosslinking agent)
08 parts by weight, 0.1 part by weight of 2,2-dimethoxy-2-phenylacetophenone (photopolymerization initiator) and 3 parts by weight of a thickener to prepare an ultraviolet-curable composition, and then dissolve oxygen with nitrogen gas. Was removed, cast on a release-treated PET film, and further covered with a release-treated PET film, and rolled to a thickness of 3 mm. Subsequently, the PET film was cured by irradiating it with ultraviolet light from a chemical lamp to produce a crosslinked acrylic resin plate. This crosslinked acrylic resin plate was cut into a size of 15 cm × 70 cm to obtain a crosslinked acrylic resin plate used as a vibration damping material.

THF-insoluble content of crosslinked acrylic resin plate The above crosslinked acrylic resin plate was cut into small pieces to obtain about 0.2 g.
Was immersed in 50 g of THF, and shaken for one day and night. Next, the mixture was filtered through a 200-mesh wire gauze. The insolubles remaining on the wire gauze were dried in an exhaust air oven at 110 ° C., the weight of the insolubles was measured, and the THF insolubles were calculated from the following formula. Indicated. THF insoluble matter (% by weight) = [dry weight of insoluble matter (g) /
Weight of cut material (g)] x 100

Tensile modulus and loss of crosslinked acrylic resin plate
Loss tangent (tan δ) The tensile elastic modulus and loss tangent (tan δ) of the crosslinked acrylic resin plate were measured by a dynamic viscoelasticity test at a frequency of 30 Hz and a temperature of 20 ° C, and shown in Table 1.

Preparation of Crosslinked Acrylic Pressure-Sensitive Adhesive 95 parts by weight of n-butyl acrylate, 5 parts by weight of acrylic acid, 0.5 of azobisisobutyronitrile (polymerization initiator)
100 parts by weight of ethyl acetate and 100 parts by weight of ethyl acetate were placed in a separable flask, and the temperature was raised to 80 ° C. to carry out polymerization. Obtained. Next, 0.1 part by weight of hexamethylene diethylene urea is mixed with 100 parts by weight of the solvent-type acrylic pressure-sensitive adhesive (solid content), and the high-quality release paper subjected to release treatment has a thickness of 50 μm after drying. After drying, a crosslinked acrylic pressure-sensitive adhesive was prepared by drying in an exhaust air oven at 110 ° C.

The cross-linkable acrylic pressure-sensitive adhesive is free from THF.
Matter dipped in the cross-linked weighed an acrylic pressure sensitive adhesive about 0.2 g 50 g of THF, was filtered through a 200 mesh wire net after overnight shaking, the insoluble matter remaining on the wire net 11
After drying in an exhaust air oven at 0 ° C. and measuring the dry weight, the THF-insoluble content was calculated from the following formula and shown in Table 1. THF insoluble matter (% by weight) = [dry weight of insoluble matter (g) /
Weight of adhesive (g)] × 100

Preparation of Damping Material A cross-linked pressure-sensitive adhesive was applied to both sides of the cross-linked acrylic resin plate (15 cm × 70 cm), and then one of the release papers was peeled off to laminate a galvanized steel sheet having a thickness of 1 mm. . Further, a cross-linked acrylic resin plate (15 cm x 70 cm) with a cross-linked pressure-sensitive adhesive applied to both sides of the galvanized steel sheet
Was repeated to obtain an alternate laminate in which four layers of crosslinked acrylic resin plates and three layers of galvanized steel sheets were alternately laminated. The release papers on the outermost layers on both sides of this alternate laminate were peeled off, and two pieces of structural plywood having a thickness of 2.5 mm × 20 cm × 80 cm were stuck together so as to fit in the longitudinal direction. And 7 indicate D)
Was prepared.

With respect to the vibration damping material, the following items were evaluated for performance, and the results are shown in Table 1.

(1) Evaluation of heat resistance After the above alternately laminated body was left standing in an oven at 40 ° C. for one month in a state of standing in the vertical direction, the slip of the galvanized steel sheet or the crosslinked acrylic resin sheet was visually observed. The presence or absence was observed.

(2) Measurement of heavy floor impact sound level Regarding the unit building with damping material interposed, JIS A
The floor impact sound level downstairs was measured according to 1418.
The impact sound generated when the heavy impact source 19 shown in FIG. 7 is dropped freely from the height of 90 cm onto the floor 16 and the heavy impact source strikes the floor 16 vertically is shielded in the lower floor room. Was measured with a sound level meter. As shown in FIG. 3, the damping material D is nailed at a portion (indicated by a cross) where the alternate laminate of the structural plywood is not attached, so that the girder floor girder of the building unit and the wife Fixed to the floor girders.

(Example 2) The alternate laminated body without the structural plywood obtained in Example 1 was used as a vibration damping material, and this vibration damping material was used as a girder floor girder and a girder floor girder, and a crosslinked acrylic feeling was used. It was pasted using a pressure-sensitive adhesive. In addition, in order to close the gap between the floor girders, 1
A 5 mm-thick structural plywood was inserted, and this portion was screwed to draw the gap between the girders.

Comparative Example 1 A crosslinked acrylic resin plate was obtained in the same manner as in Example 1 except that the amounts of n-butyl acrylate and acrylic acid were changed to 75 parts by weight and 25 parts by weight, respectively. Thereafter, a damping material D was produced in the same manner as in Example 1 using this crosslinked acrylic resin plate.

Comparative Example 2 Except that the amount of hexanediol diacrylate was changed to 0.02 parts by weight,
After obtaining a crosslinked acrylic resin plate in the same manner as in Example 1,
Using this crosslinked acrylic resin plate, a vibration damping material D was produced in the same manner as in Example 1.

Comparative Example 3 Five cross-linked acrylic resin plates were laminated using the same cross-linked acrylic pressure-sensitive adhesive as in Example 1 without using any steel sheet at all to obtain a vibration damping material.

The alternate laminates and damping materials obtained in Example 2 and Comparative Examples 1 to 3 were subjected to performance evaluation of the same items as in Example 1, and the results are shown in Table 1.

[0049]

[Table 1]

[0050]

According to the present invention, the damping material for a wooden unit building according to the present invention has the above-mentioned structure. Even when the damping material is installed on a vertical surface, the steel plate does not slip and the floor impact sound of the upper floor is transmitted to the lower floor. , And the heavy floor impact sound level can be increased to L60. In particular, when plywood is provided on both sides of the wood-based unit building damping material and fixed to the building unit by nailing, the floor impact sound at 63 Hz can be reduced by 4 dB.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a vibration damping material of the present invention.

FIG. 2 is a perspective view showing a state in which plate members are provided on both sides of a damping member.

FIG. 3 is a plan view showing a nailing or screwing portion of a plate material.

FIG. 4 is a perspective view showing the entire structure of a unit building to which the damping material is applied.

FIG. 5 is a perspective view showing a frame structure of each building unit constituting the wooden unit building.

FIG. 6 is an exploded perspective view showing a method of attaching a vibration damping material between floor girders.

FIG. 7 shows an upper floor structure of a unit building;
FIG. 5 is a sectional view taken along line AA of FIG. 4.

[Explanation of symbols]

 2a, 2b Lower-floor unit building 3a, 3b Upper-floor unit building 6 Girder floor girder (floor girder) 7 Gast floor girder (floor girder) 8 girder ceiling girder 9 Girder ceiling girder 16 Floor material 18 Damping material 18a Cross-linked acrylic type Resin layer 18b Plate-like layer D Damping material

Claims (4)

[Claims] 1. A vibration damping material inserted between the side surfaces of a floor structure of an adjacent upper-floor building unit of a wooden unit building formed by assembling a plurality of building units vertically and horizontally. A cross-linked acrylic resin layer having a thickness of 0.5 to 10 mm and a hard plate-like layer having a thickness of 0.1 to 3 mm are alternately laminated, and the laminate has at least two cross-linked acrylic resin layers, The crosslinked acrylic resin has a tensile modulus of 0.1 to 10 MPa, a loss tangent (tan δ) of 0.2 or more, and a tetrahydrofuran-insoluble content of 50% by weight.
A vibration damping material for a wooden unit building, which is characterized by the above. 2. The vibration damping material for a wood-based unit building according to claim 1, wherein the crosslinked acrylic resin layer is formed from an ultraviolet cured product of an acrylic resin. 3. A crosslinked pressure-sensitive adhesive in which a crosslinked acrylic resin layer and a hard plate layer have a tetrahydrofuran insoluble content of 50% by weight or more in an alternate laminate of a crosslinked acrylic resin layer and a hard plate layer. The vibration damping material for a wooden unit building according to claim 1 or 2, wherein the vibration damping material is laminated. 4. A plate having a size larger than that of the alternating laminate is attached to both sides of the alternate laminate of the crosslinked acrylic resin layer and the hard plate-like layer.
The damping material for a wooden unit building according to any one of the above.