JP6282998B2 - Support legs for buildings and double floor structure - Google Patents

Description

  The present invention relates to a support leg for a building particularly suitable for an apartment house such as an apartment or an apartment, and a double floor structure using the same.

Flooring is generally used in apartment houses such as apartments and apartments. The floor structure of this apartment is roughly classified into, for example, a directly pasted floor structure and a dry double floor structure.
Of these, the direct-attached floor structure refers to a floor in which carpets, PVC sheets, or wood finishing materials are directly attached to a concrete floor as a base. In particular, a construction method that forms a floor structure in which a wooden finish (flooring) is directly stretched on the underlying concrete is called a direct construction method.
Also, the dry double floor structure is a so-called laying floor structure, which is a structure in which a steel bundle with anti-vibration rubber is directly attached to a plywood, with the joist floor and the joist being omitted. .

In recent years, the need for comfort has become increasingly apparent, and higher sound insulation performance has been demanded. For this reason, the specifications for constructing a double floor structure on a reinforced concrete slab (hereinafter also referred to as “RC slab”) having a thickness exceeding 150 to 200 mm have become standard in the above-mentioned apartment houses.
In flooring finishes for apartment buildings, it is important to take measures against sound insulation from the lower floor against impact sounds generated by falling objects on the upper floor, and the floor impact sound reduction performance of the flooring material is light weight impact and weight with different characteristics. Performance against impact is required at the same time.
For example, in the report of the “Examination Committee on Representation Method of Floor Impact Sound Reduction Performance of Flooring Materials” published in March 2008 (Nippon Building Research Institute), lightweight floor impact sound and heavy floor impact Test items for two types of impact sounds such as sound are described (see Non-Patent Document 1).
In this test item, a reduction amount lower limit value for each frequency is provided, and the grades are divided into five grades as ΔLL grades for light floor impact sounds and four grades as ΔLH grades for heavy floor impact sounds.

  On the other hand, for example, in Patent Document 1 below, a shaft assembly including long joists through vibration-proof rubber as support legs is formed on a floor slab, and a block made of a sound absorbing material is arranged between the long joists. A double floor structure has been proposed.

JP-A-6-10492

Japan Building Research Institute, “Acoustic Tests-About the Grade Notation Method for Floor Impact Noise Reduction Performance (ΔL Grade)”, [Search April 1, 2015], Internet <URL: http: / /www.gbrc.or.jp/contents/test_research/acoustic/sound04.html>

In recent years, however, the nuclear family has become more and more important, with the emphasis on privacy protection and sound insulation of daily life. The above-mentioned floor structure is a structure that is often used in places that require underfloor piping, such as kitchens and corridors. Although it has a certain effect on the insulation of lightweight impact sounds, it is effective against heavy impact sounds. Since it concentrates on thin feet, there is no effect, and on the contrary, the sound may be louder than the directly pasted floor.
Further, in Patent Document 1 described above, it can be said that a certain vibration proofing / sound insulation performance can be achieved by using a vibration proof rubber and further adopting a structure in which a glass wool sound absorbing material is interposed. However, even if such a configuration is adopted, it cannot be said that vibration and sound insulation is sufficient for, for example, living sounds such as human footsteps and falling heavy objects, and impact sounds, resulting in higher sound insulation and control for buildings. Tremor is desired continuously.

  The present invention has been made in consideration of the above-described circumstances, and is a completely new construction method different from the conventional direct-bonding floor construction method and dry sound insulation double floor construction method, and it is highly capable of insulating sound generated such as impact sound and living sound. It is an object of the present invention to provide a building support leg and a double floor structure that can be used.

In order to solve the above-mentioned problems, a building support leg according to an embodiment of the present invention is (1) a building support leg in which an advanced vibration damping material is installed on a plate piece, wherein the advanced vibration damping is provided. The buffer material includes a polyurethane resin obtained by mixing and curing a polyol component and an organic polyisocyanate, and the polyurethane resin has a functional group number of 2.4 to 3.0 when the total amount of the polyol component is 100 parts by weight. , 99.5 to 90 parts by weight of a polyol having a molecular weight of 3000 to 6000, 0.5 to 10 parts by weight of a secondary or tertiary higher monoalcohol, and a substance represented by the following chemical formulas (1) to (4) 1.0 to 4.0 parts by weight of a stabilizer containing is contained, and the loss coefficient tan δ of the polyurethane resin is 0.2 or more.

  In the building support leg described in (1) or (2) above, (3) the polyurethane resin preferably has a rubber hardness of 30 or less.

  Furthermore, in order to solve the said subject, the double floor structure concerning one Embodiment of this invention is a building in any one of said (1)-(4) arrange | positioned on a floor slab and the said floor slab. And a floor base material and a floor finish material disposed on the building support leg.

  According to the present invention, it is possible to significantly improve the workability as compared with conventional products that require fixing with screws and bolts, and it is possible to highly suppress the generated sound such as impact sound and living sound. Become.

It is the side view which showed the double floor structure 1 which concerns on 1st Embodiment of this invention. (A) is the side view which showed the support leg 3 for double floors which concerns on 1st Embodiment. (B) is a perspective view which shows the structure of the board piece 31 and the advanced damping buffer 32 among the support legs 3 for double floors which concern on 1st Embodiment. (C) is a perspective view showing the configuration of a plate piece 31 having a recess C and an advanced vibration damping material 32. It is a top view which shows the example of an arrangement | sequence of the particle board 4 installed on the support leg 3 for double floors. It is a table | surface which shows the composition of the high damping buffer 32, its characteristic, and a test result. It is a table | surface which shows the composition of the high damping buffer 32, its characteristic, and a test result. It is the graph which compared each damping performance with respect to the impact in a conventional product and the advanced damping buffer 32. It is a figure which shows the result of the 30-kg sand bag impact test in the floor structure using the high damping buffer 32. It is a figure which shows the result of the load test in the floor structure using the advanced damping buffer material. It is a figure which shows the result of the local bending test in the floor structure using the advanced damping buffer material. It is a figure which shows the measurement position at the time of performing an intensity | strength performance test. It is a figure which shows the result of the floor impact sound reduction performance test in the floor structure using the advanced damping buffer 32. It is a figure which shows the floor structure at the time of the test of floor impact sound reduction performance. (A) is a perspective view which shows the structure of the board piece 31 and the advanced damping buffer 32 which concern on a modification. (B) is a perspective view which shows the structure of the board piece 31 and the advanced damping buffer 32 which concern on a modification.

DESCRIPTION OF EMBODIMENTS Hereinafter, a building support leg according to the present invention and a double floor structure using the same will be described with reference to the accompanying drawings as an example. For convenience of explanation, the X direction, the Y direction, and the Z direction are appropriately defined in the following explanation, but it goes without saying that the scope of rights of the present invention is not reduced.
<< First Embodiment >>

FIG. 1 is a side view showing a double floor structure 1 according to the first embodiment.
A double floor structure 1 according to the first embodiment is laid on a double floor support leg 3 (building support leg) disposed on a floor slab 2 and an upper surface of the double floor support leg 3. The particle board 4, the floor base material 5, and the floor finishing material 6 are included.
The double floor structure 1 can be applied mainly to apartment houses such as apartments and apartments, and buildings such as schools, government offices, and facilities, and is particularly suitable for apartment houses such as apartments. As will be apparent from the following examples, the present invention can be applied to various buildings, for example, a detached house.

  The floor slab 2 can be exemplified by the above-described RC slab and the like. For example, the floor slab 2 is made of concrete and laid in a space in the side wall 8 of the building, and has a thickness of about 13 cm to 25 cm. The material constituting the floor slab 2 is composed of cement, aggregate, water, admixture, and the like, and the blending ratio is appropriately adjusted according to the target strength, durability, workability, and the like. “Floor slab” usually refers to the floor structure between the upper floor and the lower floor when there is a lower floor, but the foundation slab placed at the top of the foundation when there is no lower floor is also in this embodiment. It is included in the “floor slab”.

The particle board 4 is a kind of wood board that is obtained by mixing a small piece of wood with an adhesive and heat-compressing it. Depending on the cutting size of wood, it is classified into oriented strand board, medium density fiber board and the like. The particle board 4 has a thickness of, for example, about 9 mm to 30 mm, and is connected to a plate piece 31 of a double floor support leg 3 to be described later via a known fastening screw or adhesive. Note that the particle board 4 is not necessarily required in the present embodiment and can be omitted as appropriate. In this case, the plate piece 31 of the double floor support leg 3 and the floor base material 5 are connected to each other by a known fastening screw or adhesive. Connected through the agent.
The floor base material 5 is configured by, for example, stacking two hard gypsum boards having a thickness of 12.5 mm and further stacking a 12 mm-thick plywood thereon. Various thicknesses of the floor base material 5 are set depending on the degree of rigidity of the floor, but a structural plywood having a thickness of 24 mm or 28 mm may be used. Moreover, you may make it provide heat insulation with rigidity by combining the floor base material 5 with a heat insulating material.

The floor finish 6 is made of wood flooring (flooring, cork, etc.), fiber flooring (carpet, sisal, etc.), or synthetic resin flooring (cushion flooring such as foamed flooring made of vinyl chloride resin) Known floor finishing materials such as plastic sheets having excellent wear resistance and chemical resistance can be used. The design and material are appropriately selected according to the client's preference. For example, a single plate flooring or a composite flooring with a thickness of 12 mm can be used.
In addition, in the hollow space sandwiched between the floor slab 2 and the particle board 4, a telecommunication cable, equipment piping, and the like can be appropriately disposed.
In the present embodiment, the baseboard 7 is provided on the side wall 8 with a predetermined gap from the floor finish 6.

Next, FIG. 2 shows a double floor support leg 3 as a building support leg according to the first embodiment. In the following, the double floor support leg 3 will be described as an example of application of the building support leg of the present invention. However, the building support leg of the present invention is used for various structures such as support of heavy objects other than the floor. Applicable to support.
In the present embodiment, as shown in FIG. 2 (a), the double-floor support leg 3 has an advanced vibration damping material 32 on the exposed surface (for example, one location in the center) of the plate piece 31 made of a wood-based material. Is arranged. In addition, the board piece 31 is not limited to 1 sheet | seat, You may be comprised by two or more arbitrary sheets. When two or more plate pieces 31 are used, these plate pieces 31 are fixed to each other with an adhesive or the like.

A plurality of the double-floor support legs 3 are arranged on the floor slab 2 so that the highly damping cushioning material 32 is in direct contact with the upper surface of the floor slab 2. And the particle board 4 mentioned above is installed on the support leg 3 for double floors arrange | positioned on the floor slab 2. As shown in FIG.
In addition, although this embodiment demonstrates using the example in which the highly damping buffer material 32 of the support leg 3 for double floors contacts the floor slab 2 directly, it is not limited to this aspect, For example, via a board piece etc. It may be installed on the floor slab 2.

Next, FIG. 3 shows an arrangement example of the particle boards 4 installed on the double floor support legs 3.
As apparent from FIG. 3, in the present embodiment, a plurality of double floor support legs 3 are arranged on the floor slab 2 (not shown in FIG. 3), and on the double floor support legs 3. A plurality of particle boards 4 are arranged with a predetermined gap therebetween.
The size of the predetermined gap is, for example, about 5 mm to 15 mm, and is 10 mm in this embodiment. In FIG. 3, double floor support legs 3 are arranged so as to correspond to the four corners of the particle board 4 to support the particle board 4.

Returning to FIG. 2, the description of the detailed structure of the double-floor support leg 3 of this embodiment will be continued.
As shown in FIG.2 (b), the plate piece 31 which comprises the support leg 3 for double floors is the dimension of length and width, for example, L3 = L4 = 60 mm-100 mm. In this embodiment, L3 = L4 = 90 mm.
The sizes of L3 and L4 are not limited to the above and can be arbitrarily set. Further, the values of L3 and L4 may not be the same value, but may be rectangular by changing these values. Further, the shape of the plate piece 31 is not limited to a rectangle such as the above-described square or rectangle, and may be a circle or an ellipse depending on the case.
The height (Z direction) of the plate piece 31 is not particularly limited, but is preferably about 5 mm to 25 mm, for example. In the present embodiment, the height of the plate piece 31 is 20 mm.

  The highly damping cushioning material 32 constituting the double-floor support leg 3 has, for example, vertical and horizontal sides (L1 and L2) of approximately 30 to 50 mm and a thickness t of approximately 1 to 20 mm, preferably 3 to 10 mm. It has become. In this embodiment, L1 = L2 = 40 mm and t = 10 mm. As described above, the advanced vibration damping material 32 has a rectangular parallelepiped shape, but needless to say, the shape is not limited to the above shape. That is, the advanced vibration damping material 32 may have different sizes of L1 and L2, or may have a cylindrical shape or an elliptical column shape.

  In addition, although this embodiment demonstrated the form which mounts the high damping buffer 32 on the flat surface of the board piece 31, it is not limited to this aspect. For example, as shown in FIG. 2 (c), a recess C having a predetermined depth may be formed in the center of the plate piece 31, and the advanced vibration damping material 32 may be disposed in the recess C. The depth of the concave portion C is preferably about half to ¼ of the thickness t of the advanced vibration damping buffer 32, for example.

  The advanced vibration damping buffer 32 is made of the following material, so that the loss coefficient tan δ is 0.2 or more.

That is, the advanced vibration damping material 32 includes a polyurethane resin obtained by mixing (chemical reaction) and curing an alcohol component (polyol component) and an organic polyisocyanate. In this polyurethane resin, when the total amount of polyol components is 100 parts by weight, 99.5 to 90 parts by weight of polyol having a functional group number of 2.4 to 3.0 and a molecular weight of 3,000 to 6,000, 0.5 to 10 parts by weight of a secondary or tertiary higher monoalcohol is contained.
In addition, the polyurethane resin said by this embodiment is the concept also including the soft polyurethane resin mentioned later and a polyurethane gel.

The secondary or tertiary higher monoalcohol is preferably sec-stearyl alcohol.
Further, the advanced vibration damping material 32 may include a polyurethane resin having adhesiveness with a rubber hardness of 30 or less. Furthermore, in this case, the polyurethane resin is preferably a polyurethane resin having a tackiness of 5 or more. From the above, it is most desirable that the highly vibration-damping cushioning material 32 includes a polyurethane resin having adhesiveness with a rubber hardness of 5 or more and 30 or less.
The “rubber hardness” is a numerical value as a result of measurement using a spring type rubber hardness meter according to JIS K6301.

The polyurethane resin of the present embodiment is an adhesive having excellent heat resistance obtained by quantitatively reacting a polyol blend partially using a secondary or tertiary higher monoalcohol as a tackifier and an organic polyisocyanate. Includes polyurethane resin.
By appropriately selecting the main component polyol, higher monoalcohol and / or organic polyisocyanate from among a myriad of candidates, for example, the hardness, mechanical strength, adhesive strength, etc. of the resulting resin By adjusting, it is possible to obtain polyurethane resins having various properties of adhesiveness.

  Polyols as main components include polyoxypolyalkylene polyols, but other polyols such as known polyester-based polyols, polytetramethylene polyoxyglycols, castor oil-based polyols, and ε- A caprolactone-based polyol, β-methyl-δ-valerolactone-based polyol, carbonate-based polyol, or the like may be used, and two or more of these may be used in combination.

  As described above, the main component polyol preferably has a functional group number of 2.4 to 3.0 and a molecular weight of 3,000 to 6,000. When the number of functional groups is less than 2.4, the resin is likely to be an uncured resin. When the number of functional groups is greater than 3 in this molecular weight range, the rubber hardness is greater than 30, and the adhesiveness is lacking. If the number of functional groups is between 2.4 and 3.0, there is no particular problem. However, the higher the functional group number, the higher the rubber hardness of the polyurethane resin, and the lower the adhesiveness. Further, the lower the number of functional groups, the lower the hardness of the polyurethane resin.

In addition, when the average molecular weight is less than 3,000, the rubber hardness is higher than 30, and at the same time, the adhesion performance is lowered, which is not preferable. When the molecular weight is larger than 6,000, the reaction does not proceed sufficiently. The obtained polyurethane resin lacks heat resistance and is not preferred.
There is no particular problem if the average molecular weight is between 3,000 and 6,000, but the lower the polyurethane, the higher the rubber hardness of the polyurethane resin and the lower the tackiness. Moreover, the higher the average molecular weight, the lower the hardness of the polyurethane resin and the higher the tackiness.

As the aforementioned polyoxypolyalkylene polyol, a known compound obtained by ring-opening addition polymerization of alkylene oxide using a low molecular weight active hydrogen compound as an initiator can be used.
The low molecular weight active hydrogen compounds mentioned here include polyhydric alcohols having 2 to 3 functional groups such as water, ethylene glycol, propylene glycol, diethylene glycol, butanediol, hexanediol, glycerin, or trimethylolpropane. Can do. It is also possible to use a mixture of two or more of these.

The secondary or tertiary higher monoalcohol as a partial component of the polyol is suitable for imparting adhesiveness to the highly vibration-damping buffer material 32. These monoalcohols are preferably soluble in the main component polyol.
Examples of the polyols corresponding to these include 2-ethylhexyl alcohol, sec-stearyl alcohol, α-terpineol, diacetone alcohol, and caprylic alcohol.

The amount of these monools used ranges from 0.5 to 10 parts by weight of the monool with respect to 99.5 to 90 parts by weight of the main component polyol when the total amount of polyol components is 100 parts by weight. preferable. When the amount of monool used is less than 0.5 parts by weight, the increase in the tackiness of the resulting polyurethane resin is scarce, and when it exceeds 10 parts by weight, the average number of functional groups of the polyol is reduced, which is preferable because of lack of heat resistance. Absent.
If the amount of monool used is in the range of 0.5 to 10 parts by weight, there is no particular problem. However, the smaller the amount used, the higher the hardness of the polyurethane resin and the lower the adhesiveness. Moreover, the higher the amount used, the lower the hardness and the stronger the adhesiveness.

The average number of functional groups of the polyol mixture is preferably 2.4 or more. When the average number of functional groups is less than 2.4, curing is likely to be poor, and even if a polyurethane resin is obtained, heat resistance is poor, which is not preferable.
The organic polyisocyanate is an organic compound having two isocyanate groups in one molecule and having an isocyanate group reactive to the hydroxyl group of the above-mentioned polyol.

As an example of the organic polyisocyanate, general aromatic, aliphatic and alicyclic compounds can be used. For example, there are tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), liquid modified MDI, xylidene diisocyanate (XDI), hexamethylene diisocyanate (HDI), cyclohexyl diisocyanate and isophorone diisocyanate, and TDI and MDI are particularly preferable.
These organic polyisocyanates can be used alone or in combination of two or more.

Furthermore, organic polyisocyanate can be reacted with polyols less than the theoretical amount using a known technique and used as a prepolymer having an active isocyanate group at the terminal. When used as a prepolymer, the reaction between the polyol compound and the organic polyisocyanate easily proceeds reliably, and a homogeneous polyurethane resin is easily obtained.
These prepolymers should have an active isocyanate group remaining amount of 2% by weight or more, preferably 2.5 to 15% by weight at the terminal. When the remaining amount of the terminal active isocyanate group is less than 2% by weight, the liquid viscosity of the prepolymer becomes high, which hinders the production of the polyurethane resin. If the remaining amount of the terminal active isocyanate group is 2% by weight or more, there is no particular problem, but if it exceeds 15% by weight, the effect of using it as a prepolymer is reduced.

When the polyol mixture and the organic polyisocyanate are chemically reacted, the equivalent ratio of the isocyanate group (NCO) of the isocyanate to the hydroxyl group (OH) of the polyol, that is, NCO / OH is preferably 0.95 to 1.05.
When this equivalent ratio exceeds 1.05, the resulting polyurethane resin has poor adhesiveness, and it is difficult to obtain a polyurethane resin having a stable rubber hardness. It is not preferable because of lack of properties.

  Here, in performing the urethanization reaction between the organic polyisocyanate and the polyol, an appropriate urethanization catalyst can be used. As this urethanization catalyst, known catalysts such as tertiary amine compounds and organometallic compounds can be used. For example, triethylenediamine, N, N′-dimethylhexamethylenediamine, N, N′-dimethylbutanediamine, lead octylate, dibutyltin laurate and the like are suitable. However, the use of this urethanization catalyst is not an essential requirement.

Moreover, the component shown below can be added to the composition for comprising the polyurethane resin of this embodiment.
That is, a plasticizer can be first added to the composition. This plasticizer can be mixed only to less than 15 parts by weight per 100 parts by weight of the total amount of polyol and isocyanate as main components. When this plasticizer is added, the hardness of the polyurethane resin obtained decreases as the amount added increases.

  Therefore, the addition of this plasticizer makes it possible to control the hardness of the polyurethane resin to some extent. However, when 15 parts by weight or more of a plasticizer is added, the mechanical properties of the polyurethane resin are impaired, the heat resistant temperature is lowered, and breathing due to the plasticizer is liable to occur. Examples of applicable plasticizers include ordinary plasticizers for polyurethane resins, such as dioctyl phthalate, dibutyl phthalate, trischloroethyl phosphate, trischloropropyl phosphate, and the like.

  Moreover, in order to improve the durability and stability of the polyurethane resin, as a stabilizer, a heat stabilizer, an antioxidant, a filler, or the like is used alone or in combination of two or more as long as there is no problem. You can also Further, in addition to those described above, pigments, dyes, flame retardants, antifoaming agents, dispersants, surfactants, moisture adsorbents, and the like can be added as appropriate.

Further, in order to improve the durability of the polyurethane resin, the polyurethane resin as the highly vibration-damping buffer material 32 has, for example, the following chemical formulas (1) to (4) when the total amount of alcohol components is 100 parts by weight as described above. It is preferable to add only 1.0 to 4.0 parts by weight of a stabilizer containing a substance represented by If it is less than 1.0, the durability is deteriorated. On the other hand, if it exceeds 4.0, the effect is not changed and it is not economical.

Thus, the polyol and the organic polyisocyanate used as raw materials are mixed at a normal temperature or in a heated state. When the additive is mixed, it may be mixed with the polyol in advance or added at the time of mixing the main component.
For example, the above-mentioned components are sufficiently mixed and then degassed under vacuum, poured into a mold at room temperature to 120 ° C., and a urethanization reaction is caused at room temperature to 120 ° C. for 2 days to 2 hours. Thereafter, the polyurethane resin of the present embodiment is obtained by taking out from the mold.

<Example of Advanced Damping Buffer 32>
Hereinafter, specific examples of the advanced vibration damping material 32 of the present embodiment will be described.
In the present example, as the highly vibration-damping buffer material 32, a polyurethane-based composition obtained by the reaction of a polyol mixture and an organic polyisocyanate was prepared for nine types A to I according to the prescription amounts shown in FIGS. did. Among these, BF, H, and I are examples, and A and G are comparative examples. Further, the results obtained by conducting predetermined tests on these nine kinds of compositions are shown in FIGS.
The materials shown in FIGS. 4 and 5 are as follows.

(1) Polyol ■ "* 1" in Fig. 4: Polyoxypolypropylene triol (molecular weight 4,000)
■ "* 8" in Fig. 5: Polyoxypolypropylene (terminal partial ethylene) triol (molecular weight 6,500)
(2) Monool ■ “* 2” in FIG. 4 and “* 9” in FIG. 5: sec-stearyl alcohol (3) Isocyanate ■ “* 3” in FIG. 4 and “* 10” in FIG. : Prepolymer obtained by reacting diphenylmethane diisocyanate and polyoxypolypropylenetriol (molecular weight 5,000) (residual amount of terminal active isocyanate group: 9.1% by weight)
(4) Other additives ■ "* 4" in Fig. 4 and "* 11" in Fig. 5: Dibutyltin laurate ■ "* 5" in Fig. 4 and "* 12" in Fig. 5: Products Name EVERSORB S02 (Taiwan Yoko Chemical Industry Co., Ltd.)
■ “* 6” in FIG. 4 and “* 13” in FIG. 5: Product name Silicon antifoaming agent SAG471 (NIPPON UNIKA)
■ "* 7" in Fig. 4 and "* 14" in Fig. 5: Synthetic zeolite powder

In the tables shown in FIG. 4 and FIG. 5, the units of the numerical values in the “polyol”, “isocyanate”, “catalyst”, “stabilizer”, and “antifoam” columns indicate parts by weight.
The “rubber hardness” is a numerical value as a result of measurement using a spring type rubber hardness meter according to JIS K6301.
The “vibration resistance (tan δ)” is a numerical value as a result of measurement in a bending test of a test piece of 30 × 5 × 2 mm with a measuring instrument “Dynamic Mechanical-cal Thermal Analyzer: Polymer Laboratories”.
The “impact absorption rate” is “x”, which is the instantaneous maximum impact value (kg) received by a 1-ton load cell under a steel plate when a 535 g steel ball is naturally dropped from a height of 690 mm onto a steel plate of 5 mm. From the impact value (“y” kg) received by a 10 mm-thickness measurement object in the same test, the impact absorption rate is a numerical value [= (1−y / x) × 100%)]. .

“Heat resistance” is evaluated as “D” when degradation occurs visually within 7 days after exposure to a predetermined temperature, “C” when degradation occurs within 7 days to 30 days, “C”, 31 days to 90 days Evaluations for the day were evaluated in 4 grades: “B”, and those with no abnormality after 90 days were evaluated, “A”.
“Adhesive strength (g / 10 mm)” is a numerical value as a result of measurement in a 180 ° peel tensile test using a stainless steel plate as an adherend.
“Compression creep characteristic” is an evaluation of the shape when the compression is released after a predetermined period (eg, 365 days) has elapsed by applying 10% compression strain under a prescribed temperature (eg, 80 ° C.) environment. . More specifically, “x” indicates that the distortion is 1 mm or more after releasing the compression, and “◯” indicates that the distortion is less than 1 mm.

The reaction was started by mixing the above materials with a homogenizer (3000 rpm / min) for 60 seconds according to the formulation shown in the table, and the mixture was degassed in vacuum.
Further, the mixture was poured into an open mold made of silicon, and the reaction was continued for a predetermined time at a predetermined temperature shown in FIGS. 4 and 5, followed by demolding. A composition (high damping buffer) was obtained.

<Evaluation of sound insulation, durability, impact resistance and floor impact sound reduction>
The advanced vibration damping material 32 has significantly improved sound insulation and vibration damping performance (soundproofing function) against impact sound compared to conventional products.
That is, according to the double-floor support leg 3 according to the present embodiment, it is possible to significantly reduce the generated sound such as the impact sound and the living sound by providing the advanced vibration damping cushioning material 32.
Below, an example of the experimental result regarding the support leg 3 for double floors is shown.

(Demonstration experiment 1)
FIG. 6 is a graph comparing the vibration damping performance of the high vibration damping cushioning material 32 of the double-floor support leg 3 according to the present embodiment with respect to the impact of a conventional product (such as natural rubber or sponge).
In this figure, the vertical axis represents acceleration (mm / s ² ) and the horizontal axis represents time (s), and the graph indicated by the dotted line corresponds to the conventional product, and the graph indicated by the solid line is the altitude control. It corresponds to the vibration damping material 32.
In the experiment, the conventional dry double floor structure was defined as “conventional”, and the double floor structure using the highly damping cushioning material 32 having a thickness of 10 mm was defined as “present invention”. For example, a structural plywood having a thickness of 12 mm was placed on these upper surfaces, and the vibration damping characteristics when a predetermined impact was applied to the structural plywood were compared.

As a result, as shown in FIG. 6, in the conventional product, the damping characteristic after the impact is not so good, and it can be seen that the vibration still remains large even 0.35 seconds after the impact is applied.
On the other hand, it can be seen that the advanced vibration damping material 32 of the present embodiment exhibits a vibration isolation effect of approximately 50% or more compared to the conventional product 0.35 seconds after the impact is applied.
In other words, the advanced vibration damping material 32 has improved vibration proofing performance by 50% or more compared to the conventional product, and shows the results that are remarkable and remarkable as compared with the conventional product. ing.

(Verification test 2)
Next, the result of the strength performance test in the floor structure using the advanced vibration damping material 32 according to the first embodiment is shown in FIGS. This strength performance test was conducted in accordance with a standard based on the “quality criteria for equipment” published by the Urban Renewal Organization (UR Urban Organization).
More specifically, “30 kg sand bag impact test” (FIG. 7) and “loading load test”, which are strength performance tests applied to “double floor base materials” defined in “equipment quality criteria”. (FIG. 8) and “local bending test” (FIG. 9) were evaluated.
FIG. 10 shows a measurement position when the strength performance test based on the above-mentioned “equipment quality judgment standard” is performed. For example, “I1” to “I3” in FIG. 7 correspond to the positions “I1” to “I3” indicated by black circles in FIG. In this strength performance test, a 12 mm thick plywood T is used on a 10 mm thick advanced vibration damping material 32.

As a result, as apparent from FIG. 7, no abnormality was observed in the 30 kg sand bag impact test. In other words, it can be said that the advanced vibration damping cushion 32 can maintain high characteristics in terms of impact resistance against dropping of heavy objects.
Next, as is clear from FIG. 8, it can be seen that the high performance can be maintained well below the determination standard defined in the strength performance test for the load test.
As can be seen from FIG. 9, it can be seen that high performance can be maintained even for the local bending test, which is significantly lower than the criteria determined in the strength performance test.
As described above, the floor structure using the advanced vibration damping cushion 32 according to the first embodiment has a performance that surpasses the “equipment quality criteria” published by the Urban Renewal Agency (UR City Organization). It has been demonstrated that

Next, FIG. 11 shows a test result of floor impact sound reduction performance in the advanced vibration damping material 32 according to the first embodiment.
This test is based on the “Classification of floor impact sound reduction performance of floor materials” shown in the report of the “Examination Committee on Expression Method of Floor Impact Sound Reduction Performance of Floor Materials” mentioned above (Japan Building Research Institute). The test was conducted in accordance with the test items of the lightweight floor impact noise reduction performance and the heavy floor impact noise reduction performance based on the “Guidelines”. The guideline is an indication of a new floor impact sound reduction performance that replaces the estimated L class used so far, when the JIS standard that defines the measurement method of floor impact sound level reduction was revised in 2007. Motivation to introduce the system increased.
In other words, the provisions of JIS A1440-1 and 1440-2 revised in 2007 are limited to the measurement to obtain the floor impact sound level reduction amount that is information for each frequency, and the performance is regarded as a single evaluation amount from the result. There was no stipulation on how to display the grade.
Against such a background, the guidelines described above were presented by the Japan Architecture Research Institute.
The floor impact sound level reduction test in the present embodiment is also performed based on JIS A 1440-1 (light floor impact sound reduction performance) and JIS A 1440-2 (heavy floor impact sound reduction performance). The “slab data” in the table refers to a value obtained by measuring the floor impact sound of the slab alone, and the numerical values in the table indicate good or bad based on this slab data.
FIG. 12 shows the floor structure during the test of floor impact sound reduction performance. As shown in FIG. 12, in this impact test, an advanced vibration damping material 32 having a length of 40 mm × width of 40 mm × thickness of 5 mm is mounted as a two-layer structure (total thickness is 10 mm) on a slab having a thickness of 150 mm. Furthermore, a plate piece 31 having a length of 72 mm × width of 72 mm × thickness of 12 mm was placed on the two-layered highly damping buffer material 32.
Then, a special high specific polymerization plate for MP floor having a thickness of 15 mm was used as the floor base material 4, and a flooring having a thickness of 12 mm was used as the floor finishing material 5. The floor finish height was 49 mm, and the skirting board was a skirting board 2 mm float and fin baseboard.

  As a result, as is clear from FIG. 11, the heavy floor impact sound reduction performance is shown to be high in a general dry double floor, such as a negative value of 63 Hz, which is a positive value. In addition, the light floor impact noise reduction performance is shown to be high performance such as a positive value at 500 Hz, 1 KHz, 2 KHz, etc. on the high frequency side.

As is clear from these experimental results, the effects of the double-floor support leg 3 and the double-floor structure 1 having the advanced vibration-damping cushioning material 32 that achieves high levels of vibration-proofing (sound insulation) performance and durability are as follows. Well demonstrated.
Note that the above experimental results are examples showing the usefulness of the present invention, and it goes without saying that other significant effects can be obtained in a load test, a local bending test, a lightweight floor impact test, a heavy floor impact test, and the like. Yes.

The first embodiment of the present invention has been described above, but various modifications can be made to the above-described embodiments without departing from the spirit of the present invention.
≪Modification≫
For example, in each of the embodiments described above, an example is shown in which one high vibration damping buffer material 32 is disposed at the center of the plate piece 31, but instead of this, a plurality of high vibration damping buffer materials 32 are provided as shown in FIG. May be arranged on one plate piece 31.
In the modification shown in FIG. 13A, the four high vibration damping buffer materials 32 are arranged at the four corners of the rectangular plate piece 31.
In addition to the arrangement of the height damping buffer 32 at the corners of the rectangular plate piece 31, for example, as shown in FIG. 13B, there are a total of four heights near the center of each piece of the rectangular plate piece 31. A vibration damping cushion 32 may be disposed.
Moreover, you may combine 1st Embodiment and the modification which were mentioned above suitably in the range which does not deviate from the meaning of this invention.

≪Effect of the present invention with respect to conventional structure≫
As described above, the present invention is a completely new construction method that is different from the conventional direct-bonding floor construction method and the dry sound insulation double floor construction method.
(1) Advantages over conventional straight-line construction (direct flooring method with wooden floor)-Compared to the fact that the wooden floor direct-bonding flooring method is a solid floor that does not have cushioning material, so sound insulation performance cannot be secured. In the present invention, the sound insulation performance of heavy impact sound is high due to the impact damping effect of the advanced vibration damping cushioning material 32. The construction period can be shortened because the construction can proceed even if the concrete (floor slab 2) surface is not completely dried. Point ・ There is an air layer between concrete (floor slab 2) and floor material (particle board 4 etc.), so heat insulation performance is high (warm) ・ Because there is the air layer, it is from concrete (floor slab 2) The point that the floor material (particle board 4 etc.) is not easily damaged by moisture. The point that the foot is hard to get tired due to the damper effect by the high damping material 32. The conventional double floor structure (dry sound insulation double floor method) More excellent points ・ High shock-absorbing capacity of the high-impact damping material 32, so that the sound-insulating effect of heavy impact sound is great. ・ By using the highly-damping shock-absorbing material 32, the height of the floor finish is reduced to 50 mm or less. Because it is possible to secure a large ceiling height and make it a spacious indoor space ・ By using the advanced damping buffer material 32, the floor finish height can be reduced to 50 mm or less, so conventional dry sound insulation It is possible to save a space of 70 mm or more with respect to the finished height (120 mm, etc.) of the double floor construction method, and it is possible to construct a high-rise apartment with the same height and a larger number of floors. The construction period for that is unnecessary and the construction period can be shortened

  As described above, the present invention is suitable for manufacturing a high-quality building support leg and a double floor structure having high sound insulation performance and durability, and a building including these.

1,11 Double floor structure 2 Floor slab 3, 3 'Support leg for double floor (support leg for building)
4 Particleboard 5 Floor base material 6 Floor finishing material 7 Skirting board 8 Side wall 9 Additional cushioning material 31 Plate piece 32 Advanced vibration damping cushioning material 34 Insertion material C Concavity

Claims (4)

It is a support leg for a building in which an advanced vibration damping material is installed on the board piece,
The advanced vibration damping material is
Including a polyurethane resin obtained by mixing and curing a polyol component and an organic polyisocyanate;
The polyurethane resin, when the total amount of the polyol component is 100 parts by weight,
99.5 to 90 parts by weight of a polyol having a functional group number of 2.4 to 3.0 and a molecular weight of 3000 to 6000, a secondary or tertiary higher monoalcohol of 0.5 to 10 parts by weight, and the following chemical formula (1 ) To (4) 1.0 to 4.0 parts by weight of a stabilizer containing the structural formula,
A support leg for a building, wherein the polyurethane resin has a loss coefficient tan δ of 0.2 or more.
  The building support leg according to claim 1 or 2, wherein the polyurethane resin has a rubber hardness of 5 or more.   The support leg for buildings according to any one of claims 1 to 3, wherein the polyurethane resin has a rubber hardness of 30 or less. Floor slabs,
The building support leg according to any one of claims 1 to 4, which is disposed on the floor slab,
A double floor structure comprising: a floor base material and a floor finish material disposed on the building support legs.