JP2000027125A - SOUND ABSORBING BODY FOR PURIFYING NOx AND SOUND- ABSORBING AND SOUND-INSULATING STRUCTURE USING THE SAME - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound-absorbing material, which is lightweight, cost of which is reduced and which has high sound-absorbing characteristics and NOx purification efficiency, and a sound-absorbing and sound-insulating structure utilizing the sound- absorbing material. SOLUTION: In a sound-absorbing material for purifying NOx, an optical reactive injurious-substance removing coating agent containing the hydrolytic product of a metallic alkoxyd and a reactive semiconductor is atomized onto the surface section of a base material, in which 100 pts.vol. cement past, which is obtained by mixing and agitating 35-50 pts.wt. water to a substance, in which a 0.5-1 pts.wt. inorganic thickener represented by a substance, in which a hormite mineral is water-granulated and changed into powder, 5-20 pts.wt. calcium aluminate fine-grain lightweight aggregate and a 0.1-0.5 pts.wt. cement water-reducing agent represented by a melamine sulfonated condensate are compounded with 100 pts.wt. cement, is mixed uniformly with 300-600 pts.vol. ultra-light weight aggregate having 2-8 mm grain size acquired by pulverizing a foamed synthetic-resin cured substance and placed into forms and cured, in 0.2-0.3 micrometer thickness. The sound-absorbing and sound-insulating structure is constituted by combining the sound-absorbing material with a sound-insulating body made of concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a NOx purifying sound absorber suitably used for walls of, for example, expressways and motorways, and both a sound absorber and a sound insulator using the NOx purifying sound absorber. The present invention relates to a sound absorbing / sound insulating structure capable of exhibiting a function.

[0002]

2. Description of the Related Art Conventionally, for example, panels using glass wool or rock wool,
Those using concrete blocks are used.
That is, the former is one in which a sound absorbing material such as glass wool or rock wool is filled and arranged between a metal sound insulating plate and a perforated plate, and has both a sound absorbing function by the glass wool and a sound insulating function by the sound insulating plate. I have. On the other hand, the latter is formed by laminating a large number of concrete blocks having open cells in contact with the front surface of a concrete wall having a sound insulation function, and has a sound absorbing effect by the open cells formed on the surface and inside of the concrete block. It can be demonstrated.

[0003]

However, since the former uses a large number of parts and uses a metal plate or wool which is troublesome to manufacture, there is a certain limit in reducing the cost. The latter, on the other hand, makes the concrete blocks relatively small, as is well known, due to the increased weight. Therefore, there is a problem that a large number of man-hours are required for the lamination work on site. In addition, since the open cells are uniform, it has been pointed out that the thickness of the product is increased in order to ensure sound absorption on the low frequency side. In view of such a situation, a porous lightweight concrete block using a lightweight aggregate such as perlite or vermiculite has been developed, but the appearance of a lighter and cheaper sound absorbing material is desired. On the other hand, these sound-absorbing materials absorb sound, but sacrifice ventilation by forming walls. NOx
(Nitrogen oxides) tend to stay. As a result, the concentration of NOx in the air increased, resulting in a poor environment.

[0004]

In order to solve the above-mentioned problems, the present invention uses an ultralight aggregate having a particle size of 2 to 8 mm obtained by crushing a cured foamed synthetic resin as an aggregate. A photocatalytic coating agent is uniformly applied to a substrate obtained by uniformly coating these ultralight aggregates with an inorganic material and bonding them in a point contact state.To realize such a structure, cement is used. As a paste, with respect to 100 parts by weight of cement, 0.5 to 1 part by weight of an inorganic thickener typified by granulating and powdering formite mineral, calcium aluminate based fine aggregate 5 to 5 parts by weight 20 parts by weight, cement water reducing agent 0.1 represented by melamine sulfonation condensation
Water to 35 parts by weight
Spraying the surface of the base material obtained by mixing and stirring at 50 to 50 parts by weight with the photoreactive harmful substance removing coating agent containing the hydrolysis product of the metal alkoxide and the reactive semiconductor so as to have a predetermined thickness. It is characterized by being applied.

[0005] Further, the present invention provides, as an aggregate, a particle size of 2 to 8 mm obtained by crushing and heating a cured foamed synthetic resin.
A photocatalyst coating agent is uniformly applied to a substrate obtained by uniformly coating these ultralight aggregates with an inorganic material and bonding them in a point contact state. As a cement paste, 0.5 to 1 part by weight of an inorganic thickener represented by a powder obtained by granulating a formite mineral with respect to 100 parts by weight of cement with respect to 100 parts by weight of cement, calcium aluminate 35-80 parts by weight of water is mixed and mixed with 5-20 parts by weight of a fine-grain lightweight aggregate and 0.1-0.5 parts by weight of a cement water reducing agent represented by melamine sulfonation condensation. The surface of the substrate obtained by spraying a photoreactive harmful substance removal coating agent containing a hydrolysis product of a metal alkoxide and a reactive semiconductor to a predetermined thickness. Features and That.

Further, the present invention combines the above-mentioned NOx purifying sound absorbing body with a concrete sound insulating body to provide a sound absorbing and high NOx purifying efficiency.
It is intended to provide a sound insulation structure. That is,
The invention of the sound absorbing / sound insulating structure corresponds to the invention of a product exclusively utilizing the specific properties of the sound absorbing body.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The NOx purifying sound absorber according to the present invention comprises 0.5 parts of an inorganic thickener represented by powder of formite mineral powdered with respect to 100 parts by weight of cement. To 1 part by weight, 5 to 20 parts by weight of calcium aluminate-based fine lightweight aggregate, and 0.1 to 0.5 part by weight of a cement water reducing agent represented by a melamine sulfonated condensate. 100 parts by weight of cement paste obtained by mixing and stirring 35 to 50 parts by weight of water is mixed with an ultralight aggregate 30 having a particle size of 2 to 8 mm obtained by crushing a cured foamed synthetic resin.
A photoreactive harmful substance removing coating containing a hydrolysis product of a metal alkoxide and a reactive semiconductor on a surface portion of a base material obtained by uniformly mixing the mixture with 0 to 600 parts by volume, driving into a mold, and curing. It has a NOx purification function obtained by spraying the agent to a thickness of 0.2 to 0.3 micrometers.

Further, the NOx purifying sound absorber according to the present invention is characterized in that for 100 parts by weight of cement, 0.5 to 1 inorganic thickener represented by powdery granulated formite mineral is used. Water is added to a mixture prepared to be 5 parts by weight, 5 to 20 parts by weight of calcium aluminate-based fine aggregate, 0.1 to 0.5 part by weight of a cement water reducing agent represented by a melamine sulfonated condensate. 100 parts by volume of the cement paste obtained by mixing and stirring 35 to 80 parts by weight is uniformly mixed with 300 to 600 parts by volume of an ultralight aggregate having a particle size of 2 to 8 mm obtained by crushing and heating a cured foamed synthetic resin. Mix,
A photoreactive harmful substance removing coating agent containing a hydrolysis product of a metal alkoxide and a reactive semiconductor is applied to a surface portion of a substrate obtained by driving into a mold and curing.
It has a NOx purification function obtained by spraying so as to have a thickness of about 0.3 μm (μm).

That is, in this NOx purifying sound absorbing body, the cement paste is applied to the surface of each ultralight aggregate in an amount of 0.5 to 2 mm.
The thickness of the cured body is cast into a mold, and cured by being cast on the surface of the base material molded so that continuous voids are 20 to 40% of the cured body.
Spray photocatalytic coating agent, average film thickness 0.2 ~
The thickness is set to 0.3 μm.

The photocatalyst coating agent is a photoreactive harmful substance removing coating agent containing a reactive semiconductor using an inorganic metal alkoxide hydrolysis product as a binder. Examples of the reactive semiconductor include anatase type titanium oxide. In this way, the base material is uniformly coated with the cement paste and formed by bonding the ultralight aggregate in a point contact state, and after curing, the open cell voids are within 20 to 40% of the product volume. It is molded. Further, since the photoreactive harmful substance removing coating agent has the same viscosity as water and the coating film has a thickness of 0.2 to 0.3 μm, it does not fill the voids of the base material, and
It is applied to a concave portion having a depth of 3 mm. Then, by reacting with the light incident into the concave portion and by passing air through the base material, NOx purification is higher than that in a case where a photoreactive harmful substance removing coating material is applied to a dense and smooth member. Efficiency can be obtained.

The inorganic thickener in the base material provides the cement paste with adhesion and viscosity,
The cement paste is used to coat the ultralight aggregate surface to a uniform thickness. The reason for using 0.5 to 1 part by weight of the inorganic thickener with respect to 100 parts by weight of cement is that if the amount is less than 0.5 part by weight, the surface of the ultralight aggregate is appropriately coated with cement paste. If the amount exceeds 1 part by weight, the coating thickness becomes excessively large and the porosity becomes unduly small.

[0012] The calcium aluminate-based fine lightweight aggregate is used for a role as a viscous aid, and for the purpose of reducing the weight of the cement paste and suppressing cracking. The reason why the ground material is used as the ultra-light aggregate is that the cement paste adheres better than when using a bead-like material having a smooth surface. There is an advantage that it is hard to separate from

When it is desired to further improve the durability of the paste such as water resistance and adhesion, a water-dispersible resin solution, particularly a polymer resin emulsion represented by an acrylic resin emulsion, is added to a cement weight of 5%. It is desirable to mix up to 15%. Further, when it is desired to mix the cement paste and the ultra-light aggregate obtained by grinding particularly homogeneously, an anionic surfactant such as alkylnaphthalene sulfonate, or a nonionic surfactant is further added to the paste composition. It is preferable to mix a foaming agent composed of an activator so that the amount of bubbles inside is 5 to 15%. That is, when such a foaming agent is introduced, the cement paste can be made into a soft cream-like one into which a large number of fine bubbles are introduced. Therefore, when the cement paste and the ultralight aggregate are kneaded, the cement paste is rich in adhesiveness, and the entire outer surface of the ultralight aggregate can be uniformly coated with the cement paste. Becomes In addition, it is possible to more reliably eliminate the problem that only the ultralight aggregate is unevenly distributed on the upper portion due to a difference in specific gravity from the cement paste.

Further, in order to reinforce the entire formed NOx purifying sound absorber, it is preferable to provide a reinforcing mesh inside. The reinforcing mesh is preferably set in the mold when the cement paste is driven into the mold. Regarding the material, a synthetic resin mesh represented by polypropylene or the like or a metal mesh such as stainless steel is particularly preferable in terms of durability and ease of handling.

In view of the importance of resource recycling for the purpose of preserving the global environment, it is desirable to crush styrene foam waste generated in large quantities without interruption to obtain ultralight aggregates. The sound-absorbing / sound-insulating structure of the present invention using the above-described NOx purifying sound-absorbing body includes a concrete sound-insulating body having a concave portion on one side, and the NOx purifying structure provided in the concave portion of the sound insulating body. And a sound absorber.
It is suitably used for soundproof walls and the like.

In this case, in order to expect a sound-absorbing effect utilizing a resonance phenomenon in addition to the sound-absorbing effect based on the flow resistance of the open cells, the depth of the concave portion is determined by the thickness of the NOx purifying sound-absorbing body. It is also desirable to set a large value and to form a cavity between the inner surface of the NOx purifying sound absorber and the bottom surface of the concave portion facing the inner surface. Furthermore, if a part or all of the formed cavity is filled with a sound absorbing member such as glass wool or rock wool, the frequency band of the sound to be absorbed can be expanded.

In order to facilitate the assembling and to simplify the replacement work when the NOx purifying sound absorber is damaged, a plurality of sound insulators are vertically stacked to form a wall. In the form of a plate, the concave portion is provided so as to be open at one of the upright surface and the upper end surface of the sound insulator, and the NOx purifying sound absorber is slidably engaged with the concave portion from the upper end surface side. Good to put.

In order to simplify the structure,
It goes without saying that the above-mentioned NOx purification sound absorber may be simply attached to one surface of the concrete sound insulator.

[0019]

EXAMPLE 1 A cubic meter of ultra-light aggregate having a particle size of 3 mm or less after pulverization after heat treatment was added with 280 to 320 liters of cement paste mixed with an adhesive, mixed, and cured to form a worm-like, that is, cement paste. Was coated on the surface of each grain of the ultralight aggregate with a thickness of 0.5 to 2 mm to obtain a 50 mm thick plate (panel) -like base material bonded in a point contact state. Therefore, the base material has fine continuous voids at a rate of 20 to 40% of its volume. Styrofoam waste was used as the ultralight aggregate.

On the surface of the above-mentioned base material, Taynock CZP-221 (a commercial product) is a photoreactive harmful substance removing coating agent in which 3% of anatase type titanium oxide ultrafine powder is mixed using a metal alkoxide hydrolysis product as a binder. (Taki Kagaku Co., Ltd.) was applied by spraying to obtain a NOx purifying sound absorber having a NOx absorbing function. By applying the photoreactive harmful substance removing coating agent by spraying in this manner, a coating layer having an average thickness of 0.2 to 0.3 μm is formed almost uniformly over the entire surface without filling the voids of the substrate. Formed.

As shown in Table 1, the NOx purifying sound absorbing body exhibited an extremely high NOx purifying rate and a good sound absorbing performance. The sound absorption coefficient was measured by a method using normal incidence using a specimen having a diameter of 99.8 mm (JIS A140
5: Method of measuring the normal incidence sound absorption coefficient of building materials by the in-pipe method)
Is an average value of a sound having a frequency of 300 to 2000 Hz. Further, the NOx purification rate was determined by placing a test sample (200 × 200 mm, thickness 5
0 mm), air having a NOx concentration of 1 ppm was introduced, and the NOx concentration at the inlet and the outlet was measured.

[0022]

[Table 1]

As the substrate, those described below can be used. The cement paste and the ultralight aggregate were blended and kneaded, and the mixture was poured into a mold to obtain a plate-shaped base material. Details of the cement paste and the ultra-light aggregate are as follows. Nine kinds of cement pastes were prepared as shown in Table 2 below. That is,
In Table 1, P-2 is a mixture of cement, water, fine lightweight sand that is a calcium aluminate-based fine lightweight aggregate, formite powder that is an inorganic thickener, and a water reducing agent. P-1 is a cement paste that is kneaded while being entrained, and P-1, P-3, and P-4 are further mixed with a foaming agent, and kneaded into a soft cream. 5, P-6, P-7
Is obtained by further adding an acrylic resin emulsion which is a water-dispersible resin liquid. P-8 and P-9 are:
The water-cement ratio was changed without using a foaming agent.
The units in the table are parts by weight.

[0024]

[Table 2]

As ultra-light aggregates, P-1 to P-6 are:
Styrofoam waste material has a particle size of 8mm by crusher
Using Styrofoam crushed sand pulverized to become the following, P-7 to P-9 coarsely pulverized waste of Styrofoam by a crusher, and crushed Styrofoam secondary to 8 mm or less by a crusher again with heat-treated Styrofoam It uses sand. Crushed styrene foam crushed sand or crushed and heat-treated styrofoam crushed sand was uniformly mixed with the cement paste, and the mixture was poured into a mold to obtain 15 types of base materials as shown in Table 3.

[0026]

[Table 3]

[0027] Here, A, B,
C shows that A is good, B can be molded even if it is a little rough, and C shows that it takes a lot of time to hold down the molding and is defective. When the calcium aluminate-based fine aggregate exceeds 20% of the weight of the cement, the strength of the base material is remarkably reduced, the viscosity of the paste is also reduced, and the paste becomes lumpy and molding is difficult.

The amount of the fine bubbles in the paste is also 1
If it exceeds 5%, the strength is greatly reduced, and the surface of the cured product is undesirably powdery. Next, the mixing ratio of the styrene foam crushed sand or the crushed and heat-treated styrene foam crushed sand to the paste component is excellent in that the volume ratio of 1: 3 to 1: 4 uniformly forms continuous voids, It is also stable in terms of strength. On the other hand, when the ratio is less than 1: 3, the porosity extremely decreases,
Not preferred. As for the sound absorption performance as a base material, a block type thing has a continuous porosity of preferably 25% to 35%.
%, There is much interference due to the styrene-containing mortar, and the efficiency due to fine continuous voids is good. The results obtained in consideration of these facts are the above examples.

The sound absorbing performance of these substrates is shown in Table 4 below. The numerical values in the table indicate the results measured by the reverberation room method defined in JIS A1409, that is, the reverberation room method sound absorption coefficient. The NOx purifying sound absorber having a thickness of 50 mm was used.

[0030]

[Table 4]

Embodiment Regarding Sound Absorbing / Sound Insulating Structure In the embodiment shown in FIGS. 1 to 4, a sound absorbing / sound insulating structure 1 for constructing a soundproof wall 2 or the like of a highway using the above-described sound absorbing body. It is composed. That is, as shown in FIGS. 1 and 2, the sound absorbing / sound insulating structure 1 includes a sound insulating body 4 having a concave portion 3 on one surface and a concave portion 3 of the sound insulating body 4.
And a NOx purifying sound absorbing body 5 mounted on the vehicle.

The sound insulator 4 has a prestressed concrete structure or a reinforced concrete structure, has a rectangular shape elongated left and right, and has a groove-shaped concave portion 3 opened on one surface and both right and left end surfaces. I have. The concave portion 3 has a dovetail shape in which the vertical width of the opening end is set slightly smaller than the vertical width of the bottom portion, and has the same composition as described in the first or second embodiment in the concave portion 3. Eggplant N
An Ox purifying sound absorber 5 is provided. That is, NOx
The sound absorbing body 5 for purification uses the sound insulating body 4 instead of a mold, and directly kneads a cement-based mortar and an ultralight aggregate into the recessed part 3, and on the surface of the hardened base material, TYNOC CZP-22, a photoreactive harmful substance removing coating agent containing 3% of anatase type titanium oxide ultrafine powder mixed with a metal alkoxide hydrolysis product as a binder
1 (trade name: manufactured by Taki Kagaku Co., Ltd.) is applied by spraying. An insert nut 7 used for temporarily screwing a hook 6 for lifting the sound absorbing / sound insulating structure during transportation or construction is embedded in the upper surface and the lower surface of the sound insulating body 4. I have.

The sound insulating member 4 and the NOx purifying sound absorbing member 5 may of course be manufactured separately and combined in the final step. FIGS. 3 and 4 show an example of a case where a soundproof wall 2 is constructed by using a plurality of the sound absorbing / sound insulating structures 1. The soundproof wall 2 has H-shaped supports 8 in plan view having concave grooves 8a on both sides thereof erected at predetermined intervals along the road. For example, six sound absorbing / sound insulating structures 1 are provided between the respective supports 8. , The supporting columns 8 corresponding to the both end portions 1a.
In a state fitted in the concave groove 8a. In FIG. 1, the left half of the sound absorbing / sound insulating structure 1 is N
The illustration of the Ox purifying sound absorber 5 is omitted.

The sound absorbing / sound insulating structure 101 shown in FIGS.
Comprises a sound insulating body 4 similar to that described above, a NOx purifying sound absorbing body 5, and a decorative plate 110 for covering and covering the NOx purifying sound absorbing body 5. The decorative plate 110 is made of, for example, sheet metal and has a louver portion 110 having air permeability.
a, and the upper end and the lower end thereof are screws 110b.
And is fixed to the front surface of the sound insulating body 4. FIG.
In the right half of the sound absorbing / sound insulating structure 101, the decorative plate 110 is omitted.

The sound absorbing / sound insulating structure 201 shown in FIGS.
Is obtained by separately manufacturing and combining the sound insulator 204 and the NOx purifying sound absorber 205. That is, on the upper and lower inner surfaces of the groove-shaped concave portion 203 of the sound insulating body 204,
A ridge 203a having a V-shaped cross section is formed, and a concave groove 205a having a V-shaped cross section is formed on both upper and lower end surfaces of the NOx purifying sound absorbing body 205. The NOx purifying sound absorbing body 205 is slid into the concave portion 203 of the sound insulating body 204 from one end in the longitudinal direction such that the ridge 203a is fitted into the concave groove 205a. .

The sound absorbing / sound insulating structure 201 is provided with the sound insulating body 2
04 is set to be larger than the thickness of the NOx purifying sound absorbing body 205.
x Inner surface 205b of purifying sound absorber 205 and inner surface 205b
Cavity 2 between the recess 203 and the bottom surface 203b of
10 are formed. When the cavity 210 is unnecessary, it is a matter of course that the thickness of the NOx purifying sound absorbing body 205 and the depth of the recess 203 may be set substantially equal. Further, a part or all of the cavity 210 may be filled with an existing sound absorbing member such as glass wool or rock wool. By filling the sound absorbing member in this way, the NOx purifying sound absorbing body 20 is filled.
5 alone can absorb sound in a band wider than the frequency band of the sound absorbed.

The sound absorbing / sound insulating structure 3 shown in FIGS.
01 is the same as that shown in FIGS.
And the NOx purifying sound absorber 305 are separately manufactured and combined. That is, the sound insulator 304 is
The plurality of recesses 303 are formed by one of the upright surface 304 a and the upper end surface 3.
The NOx purifying sound absorber 305 is slidably engaged with each of the recesses 303 from the upper end surface 304b side. Protrusions 303a having a V-shaped cross section are formed on both left and right inner surfaces of each of the concave portions 303 of the sound insulator 304, and a cross-section V is formed on both left and right end surfaces of each NOx purifying sound absorber 305. A concave groove 305a is formed. Then, each NOx purifying sound absorbing body 305 is inserted into the concave groove 305a by the ridge 303a.
And the upper end surface 304 of the sound insulating body 304
The sliding engagement is performed from the side b into the corresponding concave portion 303.

The sound absorbing / sound insulating structure 301 is also used as the sound insulating body 3.
04 is set to be larger than the thickness of the NOx purifying sound absorber 305.
x Inner surface 305b of purifying sound absorber 305 and inner surface 305b
Cavity 3 between the bottom surface 303b of the concave portion 303 facing the
10 are formed. In FIG. 10, the left half of the sound absorbing / sound insulating structure 301 is a NOx purifying sound absorbing body 305.
Are omitted from the drawing. Also in this embodiment, the cavity 3
10 is unnecessary, the NOx purifying sound absorber 305 is used.
It is needless to say that the thickness dimension of the concave portion 303 and the depth dimension of the concave portion 303 may be set substantially equal.

The sound absorbing / sound insulating structure 401 shown in FIG.
A NOx purifying sound absorber 405 is provided on one flat surface of the sound insulator 404.
Is added by an appropriate method, and the structure can be simplified.

[0040]

The sound absorber for purifying NOx according to the present invention is obtained by crushing a foamed synthetic resin such as styrene foam, and crushing and heating the foamed synthetic resin. The aggregate has a structure in which the aggregate is uniformly wrapped by the hardened material of the cement paste and is connected to each other in a point contact state.
It is provided at a rate of about 40% and has a surface area of 0.1%.
It has a coating layer of a photoreactive harmful substance removing coating agent of 2 to 0.3 μm. Therefore, according to the present invention, it is extremely lightweight and easy to handle, and
An object of the present invention is to provide a NOx purifying sound absorber having excellent sound absorbing characteristics and a NOx purifying function. Therefore, the NOx purifying sound absorber according to the present invention can be suitably used for a soundproof wall of a highway, etc., and even in a place with a large traffic volume, the deterioration of the environment due to NOx is reliably and efficiently performed. Can be prevented. Also, such N
The sound absorbing material for purifying Ox has fire resistance because each ultralight aggregate is uniformly coated with the inorganic cement paste.

Further, those further mixed with a water-dispersible resin such as an acrylic resin not only can improve the adhesive strength of the cement paste, but also have particularly good water resistance and are suitable for outdoor use. It becomes something.
Further, when using a cement paste in which the proportion of air bubbles mixed with an anionic surfactant such as an alkyl naphthalene sulfonate or a non-ionic surfactant is 5 to 15%, In particular, a large amount of air can be entrained finely, and can be kneaded into a soft cream. Therefore, the specific gravity of the cement paste can be made as small as possible, and even if an ultra-light aggregate is added and kneaded therein, the cement paste is rich in adhesive strength, The problem that the ultralight aggregate is biased upward due to the difference in specific gravity can be effectively suppressed, and when using hard styrene that has been heat-treated, the paste is substantially uniformly adhered to the styrene surface. When the continuous voids are not filled with the paste, the high-quality NOx purifying sound absorber in which the ultralight aggregate is uniformly dispersed can be obtained.

If a synthetic resin mesh or a metal mesh is provided inside, the strength of the NOx purifying sound absorbing body can be increased, so that the handling becomes easier and it is formed into a relatively thin shape. It can also be put to practical use. The use of Styrofoam waste as an ultra-light aggregate not only makes it possible to effectively use waste resources that are in short supply, but is not only economically advantageous but also contributes to the preservation of the global environment. Gain.

Further, by combining such a NOx purifying sound absorbing body with a concrete sound insulating body, a suitable sound absorbing / sound insulating structure having a NOx purifying function can be constructed for constructing a soundproof wall or the like on an expressway. Becomes possible. By using such a NOx purifying sound absorber, the weight of the sound absorbing / sound insulating structure itself can be reduced, so that not only transportation and construction can be facilitated, but also a tall soundproof wall can be easily constructed. Can be.

Such a sound absorbing / sound insulating structure uses open cells formed in a cement composition of a NOx purifying sound absorbing body,
Although it can be used as a flow resistance inducing means for exerting a sound absorbing effect, a cavity can be formed between the inner surface of the NOx purifying sound absorber and the bottom surface of the concave portion facing the inner surface. If this is the case, the cavity can be used as a resonance space for silencing the sound by utilizing the resonance action. Therefore, by appropriately selecting the volume of the cavity, it is possible to particularly improve the soundproofing effect against sound of a specific frequency.

A concave portion of the sound insulator is provided so as to be open on one of the upright surface and the upper end surface of the sound insulator, and the NOx purifying sound absorber is slidably engaged with the concave portion from the upper end surface. In this case, each NOx purifying sound absorber can be fixed to the sound insulator so as not to fall off only by stacking a plurality of sound insulators. In addition, when a specific NOx purifying sound absorber is damaged, the damaged NOx purifying sound absorber can be replaced with a new one simply by slightly lifting the upper sound absorbing / sound insulating structure. Therefore, it is possible to construct a soundproof wall that is easy to maintain as well as to construct.

[Brief description of the drawings]

FIG. 1 is a front view partially showing another embodiment of the present invention;

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is an overall plan view showing the embodiment.

FIG. 4 is an overall front view showing the embodiment.

FIG. 5 is a front view partially showing another embodiment of the present invention;

FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5;

FIG. 7 is an overall front view showing the embodiment.

FIG. 8 is a front view showing a still further embodiment of the present invention with a part being omitted;

FIG. 9 is an enlarged sectional view taken along line CC in FIG. 8;

FIG. 10 is a front view showing a still further embodiment of the present invention with a part being omitted;

FIG. 11 is a partial plan view showing the embodiment.

12 is a sectional view taken along line DD in FIG.

FIG. 13 is an overall front view showing the embodiment.

FIG. 14 is an enlarged cross-sectional view corresponding to FIG. 2, showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sound absorption / sound insulation structure 1a ... Side end part 2 ... Soundproof wall 3 ... Concave part 4 ... Sound insulation 5 ... Sound absorber 6 ... Hook fitting 7 ... Insert nut 8 ... Strut 8a ... Concave groove 101 ... Sound absorption / sound insulation structure 110: decorative board 110a: louver part 110b: screw 201: sound absorbing / sound insulating structure 203: concave part 203a: ridge 203b: bottom surface 204: sound insulating body 205: sound absorbing body 205a: concave groove 205b ... inner surface 210: cavity 301: sound absorbing・ Sound insulation structure 303 ... Concave part 303a ... Protrusion ridge 304 ... Sound insulation body 304a ... Standing surface 304b ... Top surface 305 ... Sound absorber 305a ... Concave groove 310 ... Cavity 401 ... Sound absorption / sound insulation structure 404 ... Sound insulation body 405 ... Sound absorber

[Procedure amendment]

[Submission date] July 28, 1999 (July 7, 1999
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

As the substrate, those described below can be used. The cement paste and the ultralight aggregate were blended and kneaded, and the mixture was poured into a mold to obtain a plate-shaped base material. Details of the cement paste and the ultra-light aggregate are as follows. Nine kinds of cement pastes were prepared as shown in Table 2 below. That is,
In Table 2 , P-2 is a mixture of cement, water, fine lightweight sand as a calcium aluminate-based fine lightweight aggregate, formite powder as an inorganic thickener, and a water reducing agent. P-1 is a cement paste that is kneaded while being entrained, and P-1, P-3, and P-4 are further mixed with a foaming agent and kneaded into a soft cream shape. 5, P-6, P-7
Is obtained by further adding an acrylic resin emulsion which is a water-dispersible resin liquid. P-8 and P-9 are:
The water-cement ratio was changed without using a foaming agent.
The units in the table are parts by weight.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

The sound insulator 4 has a prestressed concrete structure or a reinforced concrete structure, has a rectangular shape elongated left and right, and has a groove-shaped concave portion 3 opened on one surface and both right and left end surfaces. I have. The concave portion 3 has a dovetail shape in which the vertical width of the opening end is set slightly smaller than the vertical width of the bottom portion. The concave portion 3 has the same configuration as that described in the embodiment of the NOx purifying sound absorber in the concave portion 3. The NOx purifying sound absorber 5 having an appropriate composition is provided. That is, the NOx purifying sound absorbing body 5 uses the sound insulating body 4 instead of a mold, and directly kneads a cement-based mortar and an ultralight aggregate into the recessed part 3 to form a hardened base material surface. In the part, using a hydrolysis product of metal alkoxide as a binder, Taynock CZP-221 (trade name: manufactured by Taki Kagaku Co., Ltd.), a photoreactive harmful substance removing coating agent mixed with 3% of anatase type titanium oxide ultrafine powder , Formed by spraying. An insert nut 7 used for temporarily screwing a hook 6 for lifting the sound absorbing / sound insulating structure during transportation or construction is embedded in the upper surface and the lower surface of the sound insulating body 4. I have.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

The sound absorbing / sound insulating structure 101 shown in FIGS.
It includes a similar sound insulating member 4 as described above, in addition to the NOx purifying sound absorber 5 consists comprises a decorative plate 110 to cover the sound absorber 5 for the NOx purification. The decorative plate 110 is made of, for example, sheet metal and has a louver portion 110 having air permeability.
a, and the upper end and the lower end thereof are screws 110b.
And is fixed to the front surface of the sound insulating body 4. FIG.
In the right half of the sound absorbing / sound insulating structure 101, the decorative plate 110 is omitted.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG. 1 is a front view partially showing an embodiment of the present invention;

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/86 G10K 11/16 DA G10K 11/16 11/162 (72) Inventor Setsuharu Hideshima Kanagawa 4-1111-1 Matsumicho, Kanagawa-ku, Yokohama-shi 406 Towa Myorenji Corp. (72) Inventor Kazuya Nishimura 3-12-14, Wakaizumi, Honjo-shi, Saitama (72) Inventor Koji Noguchi Umezu Owana, Ukyo-ku, Kyoto-shi, Kyoto, Japan 6-6 Bamachi Arashiyama Royal Heights Building No. 3 1003 (72) Inventor Kojiro Yuki 2-10-22 Misonocho, Kodaira-shi, Tokyo (72) Inventor Koichi Nagase 4466-15F, Izumi-cho, Izumi-ku, Yokohama-shi, Kanagawa Prefecture Terms (reference) 2D001 AA01 CA01 CB01 CD02 CD04 2E001 AA02 AA04 AA08 AB03 AB05 AB07 AB08 AC03 AG01 BA00 4D002 AA12 AC10 BA03 BA04 DA47 DA70 EA02 EA05 GA01 GB08 GB12 HA10 5D061 AA06 AA11 AA13 AA11 DD11

Claims (12)

[Claims] 1. An inorganic thickener represented by a powder obtained by granulating a formite mineral in an amount of 0.5 to 1 part by weight with respect to 100 parts by weight of cement, and a calcium aluminate-based fine lightweight aggregate. 5 to 20 parts by weight, 0.1 to 0.5 parts by weight of a cement water reducing agent represented by a melamine sulfonated condensate,
100 parts by volume of a cement paste obtained by mixing and stirring 35 to 50 parts by weight of water into a mixture prepared so as to obtain an ultralight aggregate 300 having a particle size of 2 to 8 mm obtained by crushing a cured foamed synthetic resin. A coating agent for removing photoreactive harmful substances comprising a hydrolysis product of a metal alkoxide and a reactive semiconductor on a surface portion of a base material obtained by uniformly mixing the mixture into up to 600 parts by volume, driving into a mold, and curing. 0.2 to 0.3
NO obtained by spraying to a micrometer thickness
A NOx purification sound absorber having an x purification function. 2. 100 parts by weight of cement, 0.5 to 1 part by weight of an inorganic thickener represented by powdery granulation of formite mineral, calcium aluminate based fine aggregate 5 to 20 parts by weight, 0.1 to 0.5 parts by weight of a cement water reducing agent represented by a melamine sulfonated condensate,
100 parts by volume of a cement paste obtained by mixing and stirring 35 to 80 parts by weight of water with a mixture prepared so as to obtain a particle size of 2 to 8 m obtained by crushing and heating a cured foamed synthetic resin.
m ultra-light aggregate of 300-600 parts by volume, uniformly mixed, driven into a mold, and cured on the surface of the substrate,
Having a NOx purification function obtained by spraying a photoreactive harmful substance removing coating agent containing a hydrolysis product of a metal alkoxide and a reactive semiconductor so as to have a thickness of 0.2 to 0.3 μm. N characterized by
Ox purification sound absorber. 3. The cement paste according to claim 1, further comprising 5 to 15 parts by weight of a water-dispersible resin liquid such as acrylic resin added to 100 parts by weight of cement. 3. The sound absorber for purifying NOx according to 1 or 2. 4. The cement paste is further mixed with an anionic surfactant such as an alkylnaphthalene sulfonate or a foaming agent comprising a nonionic surfactant in the above-mentioned paste composition. The method according to claim 1, wherein the value is adjusted to be 15%.
4. The NOx purifying sound absorber according to 2 or 3. 5. A reinforcing mesh internally provided, wherein the reinforcing mesh is a synthetic resin mesh represented by polypropylene or the like set in the mold when the cement paste is poured into the mold, or The NOx purifying sound absorber according to claim 1, 2, 3, or 4, which is a metal mesh such as stainless steel. 6. The NOx purifying sound absorber according to claim 1, wherein the ultralight aggregate is obtained by crushing waste material of styrofoam. 7. The NOx purifying sound absorber according to claim 2, wherein the ultralight aggregate is obtained by crushing and heating a waste material of styrofoam. 8. A sound insulator made of concrete having a concave portion on one surface, and disposed in the concave portion of the sound insulator.
A sound absorbing / sound insulating structure comprising the NOx purifying sound absorbing body according to 2, 3, 4, 5, 6, or 7. 9. A depth dimension of the concave portion is set to be larger than a thickness dimension of the NOx purifying sound absorber, and a gap between an inner surface of the NOx purifying noise absorber and a bottom surface of the concave portion facing the inner surface. The sound absorbing / sound insulating structure according to claim 8, wherein a cavity is formed. 10. The sound absorbing / sound insulating structure according to claim 9, wherein a sound absorbing member is filled in a part or the whole of the cavity. 11. A sound insulating body having a plate-like shape configured so as to be able to form a wall by stacking a plurality of sound insulating bodies in a vertical direction, wherein said recessed portion is opened on one of a rising surface and an upper end surface of said sound insulating body. The sound absorbing / sound insulating structure according to claim 8, 9 or 10, wherein the NOx purifying sound absorbing body is slidably engaged with the concave portion from the upper end surface side. 12. A sound insulator made of concrete, and a sound insulator provided on one surface of the sound insulator.
A sound absorbing / sound insulating structure, comprising: the NOx purifying sound absorbing body according to any one of the preceding claims.