KR100754988B1 - Sound absorbing member and manufacturing method for the same - Google Patents

Abstract

The sound absorbing member of the present invention is repeatedly formed in the process of pressing the lightweight aggregate paste is formed of a plurality of layers, the lightweight aggregate paste is characterized in that the dry lightweight aggregate paste prepared by mixing light aggregate with cement and water.

According to the present invention, it is possible to obtain the advantage that the sound absorbing performance of the sound absorbing member is improved.

In addition, since the small voids in the lightweight aggregate and the relatively large voids between the lightweight aggregates can be maintained intact even when the sound-absorbing member is completed without being damaged, the sound-absorbing performance is improved, and the soundproofing effect is obtained while the area is reduced during installation. Can be.

In addition, the strength is improved by using a light aggregate, but the chemical stability is high, the service life is long.

In addition, since the lightweight aggregate paste is laminated in a plurality of layers during the manufacturing process of the sound absorbing member, it is possible to obtain a high sound absorbing effect while increasing the strength of the sound absorbing member.

Sound absorbing member

Description

Sound absorbing member and manufacturing method of the sound absorbing member {Sound absorbing member and manufacturing method for the same}

1 is a view illustrating a mixing process of each member constituting the sound absorbing member according to the present invention.

2 is a diagram schematically illustrating a structure of a sound absorbing member molding machine.

3 is a view for explaining a process of forming a sound absorbing member by the sound absorbing member molding machine.

<Explanation of symbols for main parts of the drawings>

11: box 12: mold 13: bottom 14: first vibration source

15 pressurization source 16 second vibration source

The present invention relates to a sound absorbing member and a method for manufacturing the sound absorbing member, and more particularly, to a sound absorbing member manufactured with light weight aggregate as a main component and a method for manufacturing the sound absorbing member. More specifically, the present invention relates to a sound absorbing member and a method for manufacturing the sound absorbing member in which the sound absorbing efficiency of the light weight aggregate is maximized and the strength of the completed sound absorbing member is increased.

In modern society, the amount of movement of people and cargo is high, and traffic volume is increasing accordingly. Representative examples of the means of transportation include vehicles, railroads, and aircrafts, and since the aircraft is a means of transportation, the problem of noise does not arise much, but the problem of generating a lot of noise as vehicles and railways is a means of transporting the ground. have. For example, people living in the vicinity of highways are disturbing their daily lives because of the noise generated by vehicles traveling at high speeds, and the situation is the same on ordinary roads.

In order to solve the noise problem, it is common to install soundproof walls around the road, and these soundproof walls prevent the noise generated during the operation of the transportation means from being absorbed or reflected and transmitted to the surroundings. However, since these soundproof walls do not have high sound absorption performance, the size of the soundproof walls is increasing in recent years, and the demand for new soundproof walls is increasing.

Briefly, the types of sound barriers that have been used in the past are introduced.

In recent years, the most popular soundproof walls include aluminum soundproof walls, which are provided with uneven parts of a certain standard for scratches, transparent soundproof walls made of transparent resin, and lightweight concrete soundproof walls made of lightweight aggregate. .

In more detail, each of the soundproof walls described above, the aluminum soundproof wall is made of aluminum and noise is absorbed or reflected by the uneven parts while a plurality of uneven parts are provided on the inner side facing the transportation means. To be absorbed. However, the aluminum soundproof wall has a disadvantage in that the appearance of the dust is contaminated due to the dust in the air over time, and the noise absorption rate is lowered because it blocks the transmission of noise of the means of transportation in a mainly reflective manner.

In addition, the transparent sound barrier has the advantage of being easy to manufacture, but the problem is that the appearance is contaminated as the use time becomes longer, and this also absorbs the noise in a way that the reflection of the noise, so that the source absorbs the noise and eliminates There is a disadvantage that can not. Furthermore, since the aluminum soundproof wall and the transparent soundproof wall are inferior in chemical stability, there is a problem that the properties of the product change as the use time becomes longer.

The use of lightweight concrete soundproof walls is expected to improve the above problems. The lightweight concrete soundproof wall is a method of using a flaw member after mixing the assembled lightweight aggregate with cement to produce a panel of a certain size.

However, the light weight concrete soundproof wall has a problem in that the performance of the light weight aggregate is degraded due to the degradation of the performance of the light weight aggregate while manufacturing the assembled lightweight aggregate in the form of a rectangular panel. This is a problem that occurs when the characteristics of porous lightweight aggregates are not properly grasped, and the sound absorbing effect is remarkably inferior due to the problem that a plurality of voids formed in the interior of the lightweight aggregates are filled during the manufacturing process of the sound absorbing member. Is caused. Not only this, but also a case where a relatively large gap formed in the gap between the light weight aggregates is remarkably filled by the occlusal member such as cement. This problem is more lethal because the lightweight concrete soundproof wall is operated in a way that directly absorbs the noise, unlike other soundproof walls.

Furthermore, when the size and area of the sound absorbing member are smaller than that of the sound absorbing member operated in another manner, the sound absorbing performance deterioration of the light weight concrete soundproof wall has a disadvantage of causing more problems.

The present invention proposes a sound absorbing member and a method of manufacturing the sound absorbing member having a light weight aggregate as a main component and the sound absorption performance is improved. In particular, the sound absorbing member and the method of manufacturing the sound absorbing member to improve the sound absorbing performance by the small voids in the light aggregate and the relatively large gap between the light aggregate is improved while the area is reduced during installation.

In addition, the present invention proposes a sound absorbing member and a method of manufacturing the sound absorbing member, in which the strength is improved and the chemical stability is increased by using the light aggregate.

Sound absorbing member according to the present invention for achieving the above object is repeatedly formed in the process of pressing the lightweight aggregate paste is formed of a plurality of layers, the lightweight aggregate paste is a dry lightweight manufactured by mixing lightweight aggregate with cement It is characterized in that the aggregate.

According to another aspect of the present invention, there is provided a method of manufacturing a sound absorbing member, comprising: putting a lightweight aggregate paste into a box and pressing the die by means of a mold; And putting the secondary lightweight secondary aggregate into the secondary lightweight secondary aggregate paste.

According to the present invention, there is an advantage in that the performance of the sound absorbing member is improved, and the soundproof wall is reduced in size because of excellent sound absorbing performance, and the strength of the sound absorbing member is increased.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the accompanying embodiments, and those skilled in the art who understand the spirit of the present invention easily suggest other embodiments included in the scope of the same idea by adding, changing, deleting, and adding components. It may be said that this is also included within the scope of the present invention.

The sound absorbing member of the present invention is characterized in that the light weight aggregate is used as a main component, and the light weight aggregate is molded in a predetermined shape required by the properties of the sound absorbing member after being mixed in a predetermined manner with a predetermined bonding material and additives. . Specifically, the present invention is characterized by the inventors propose the compounding ratio of each member and the compounding process of each member to have the best sound absorption efficiency, the optimum strength by a number of experiments.

Table 1 describes the mixing ratio of the sound absorbing member according to the present invention.

TABLE 1

material Volume (m ³ ) Mass (kg) Lightweight aggregate 1.11 m ³ ± 3% - cement - 200kg ± 3% Color pigment - 1.00kg ± 3% Fiberglass - 0.83kg ± 3% water - 100kg ± 3%

Referring to Table 1, the sound absorbing member according to the present invention is manufactured by mixing and curing the light aggregate, cement, color pigment, glass fiber and water in a predetermined ratio.

The amount of each of the sub-materials constituting the sound-absorbing member may be 3% to the predetermined amount as described in Table 1 above. If it is over or below the proposed range, it will not be possible to obtain desirable properties. For example, the volume of the light weight aggregate is preferably to have a volume of 1.11m ³ , in which case the weight of the light weight aggregate is the light weight aggregate reaches 1.5 ~ 1.6, so the mass is 1.665kg to 1.776kg To this. If, when the volume of the light aggregate does not reach the volume of the other members are mixed as shown in Table 1, the cement paste reaches the internal voids of the light aggregate, the voids inside the light aggregate is filled or the inside of the light aggregate Problems such as smaller voids may occur. Furthermore, when the volume of the light weight aggregate is larger than this, cement may not be coated on the light weight aggregate as a whole, and thus the strength of the sound absorbing member may be lowered.

Hereinafter, each member mentioned above is explained in more detail.

First, lightweight aggregates are aggregates that are lighter in weight than ordinary aggregates, and include natural lightweight aggregates, artificial lightweight aggregates, and industrial by-products. It is produced by molding and then reassembling and expanding during firing. In the present invention, it is characterized by using an artificial lightweight aggregate using inflated shale. Hereinafter, the manufacturing process of the inflated shale used directly in the sound absorbing member of the present invention will be described in detail.

The expandable shale artificial lightweight aggregate has a crush type and a re-constitution type, and the crush type has a natural appearance without additional processing on the appearance after crushing the expandable shale ore to a certain particle size. Whereas the product is produced by firing as it is, the reassembly type is processed to the expanded shale ore in the form of fine powder and then reassembled to form a certain particle size and shape, and then produced by firing. The reassembling type expandable artificial light weight aggregate can be manufactured in various sizes and has a high absorption effect of noise because the predetermined shape and the arrangement of the internal pores are very stable. In addition, the artificial lightweight aggregate may be used particles of various circular diameters ranging from 2 to 4, 4 to 8, 8 to 16 millimeters.

In the embodiment of the present invention, it is preferable to use reassembled expandable artificial light weight aggregate. However, even in the case of using other types and types of lightweight aggregates, there is a slight decrease in sound absorption performance, of course, the effect of sound absorption can be obtained.

The cement can be used as a general Portland cement as a bonding material for bonding the light weight aggregates together in a paste mixed with water.

The color pigment is intended to give its own color to the sound absorbing member. When various colors are provided to the sound absorbing member by the color pigment, the sound absorbing member is provided in more various colors, and when the sound absorbing members having various colors to be separated are collected in a predetermined pattern, the shape and shape may be eventually formed. It can be a vital energy for a dry road environment.

The glass fiber plays a role similar to that of reinforcing concrete in reinforced concrete, and serves to reinforce the strength of the sound absorbing member. In more detail, the glass fiber is a fibrous material manufactured by various methods such as mechanically stretching a glass in molten state. The glass fiber is non-burning, hygroscopic, has excellent chemical durability, and has high tensile strength. It is strong, has low elongation, high electrical insulation, small wear resistance, and good heat insulation and sound insulation. And the diameter of glass fiber reaches the unit of micrometer. Since the glass fibers are used together with the bonding material of the sound absorbing member, the strength of the bonding material is enhanced, and thus, the strength of the sound absorbing member can be improved.

The water is a material that mixes solid materials, such as cement, if the water is too much as described previously, the cement penetrates into the internal pores of the lightweight aggregate to block or shrink the pores to reduce the sound absorption efficiency May be generated, if too small, the cement is not mixed as a whole may cause a problem that the strength of the sound absorbing member is lowered. The numerical values suggested in Table 1 above suggest optimal conditions for solving these problems.

The various subsidiary materials as suggested in Table 1 are pasted through a certain step, and the mixing step prevents blockage or breakage of large pores formed in the gap between the small aggregates and the light aggregates within the light aggregate. This is a step proposed in order to prevent the strength degradation of the lightweight aggregate.

1 is a view illustrating a mixing process of each member constituting the sound absorbing member according to the present invention.

Referring to Figure 1, first, the lightweight aggregate is added to the stirrer (1), wherein the stirrer is preferably applied to the horizontal stirrer to rotate horizontally, which is a large drop in the mixing of the light aggregate and the bonding material in the vertical stirrer This is because the light aggregate is broken. After the light aggregate is introduced, a predetermined amount of water is first introduced (2). As such, after the first water is introduced, the stirrer is operated to perform primary mixing (3).

In this case, the amount of water initially added amounts to 20 to 30% of the total amount of water required. Thus, the amount of water initially added is an amount that wets the outer surface of the lightweight aggregate, and the water inside the voids of the lightweight aggregate is water. This is to ensure that evenly injected cement to the outer surface of the lightweight aggregate evenly does not flow. In other words, a small amount of water to be added primarily forms a membrane on the outside of the opening to prevent the opening formed in the interior of the lightweight aggregate to communicate with the outside, and the water is evenly wetted on the outer surface of the lightweight aggregate. The cement is used to float on the outer surface of the lightweight aggregate.

In addition, the light weight aggregate should be stored in a dry place, because in the state where the light aggregate is absorbed moisture during storage, the water is later leaked out during stirring to flow the cement into the light aggregate to prevent voids.

After the water is evenly spread on the outer surface of the light aggregate, cement is added (4), and water is additionally added (5). As such, after cement and water are added, secondary mixing is performed by the stirrer (6).

In this case, the secondary water is 70-80% of the total water, and the necessary water is added as a whole. Secondary water input is the amount necessary to carry out the cement mixing action, which is the amount necessary to form the cement paste. However, the amount of cement added as the bonding material is about 200 kg and the amount of water is about 100 kg, which is the ratio of cement to dry cement paste. The cement paste is more of a fluid solid state than a liquid state as a whole. Therefore, even if you hold the light weight aggregate in the hand, it is preferable that the cement paste does not stick to the hand.

On the other hand, even if the stirring is carried out in the state in which the water and cement is secondary, the cement paste cannot be introduced into the interior voids of the lightweight aggregate. This is not only a state in which the water is immersed in the outer surface of the lightweight aggregate by the primary mixing and no water is injected into the internal voids, and the internal voids of the lightweight aggregate are protected by a water film, and also in the secondary mixing step (6). This is because the cement film does not flow into the water film. In addition, the dry cement paste is in a state in which the amount of water is absolutely insufficient, so that the cement paste is not further introduced into the interior pores of the lightweight aggregate.

On the other hand, before performing the secondary mixing step (6), the color pigment and the glass fiber may be in the state of being pre-injected, but more preferably, the color pigment and glass fibers forming a fine powder does not agglomerate with each other and is light weight aggregate It is preferred to be introduced after the secondary mixing step 6 has been completed in order to spread out throughout the whole (7).

After the color pigment and the glass fiber is put into the third mixing (8), the color pigment and the glass fiber are mixed with the light aggregate as a whole to give the color of the light aggregate and increase the strength of the light aggregate.

By the above-described process, the production of the whole mixture constituting the light aggregate is completed. Thereafter, the process of molding the light weight aggregate in the paste state is put in a predetermined mold.

FIG. 2 is a view schematically illustrating a structure of a molding machine, and FIG. 3 is a view illustrating a process of molding by a molding machine. Referring to FIGS. 2 and 3, the sound absorbing member is molded in more detail. do.

The molding apparatus for lightweight aggregate includes a box 11, a lower plate 13 that blocks the bottom of the box 11, and a mold 12 that blocks the top surface of the box 16. Since the mold 12 is formed with a bone having a predetermined shape, the mold 12 is pressed by the mold 12 to form a sound absorbing member, and then a bone and a floor having a predetermined shape are formed on the surface of the sound absorbing member. Sound absorption efficiency by the sound absorbing member is to be improved.

In addition, the lower plate 13 is preferably made of another article that is separated from the box 11 in order to allow the lightweight aggregate to fall through the lower surface of the box 11 after the molding of the lightweight aggregate is completed. After the production of the lightweight aggregate is completed by this configuration, the lower plate 13 is removed, so that the lightweight aggregate inside the box 11 may be removed. Of course, the shape of the box 11 and the lower plate 13 and the mold 12 may vary depending on the shape of the lightweight aggregate required.

Since the second vibration source 16 is connected to the box 11, and the vibration applied from the second vibration source 16 is applied to the box 11, the lightweight aggregate in the paste state in the box 11. Light aggregate may be evenly distributed of the box 11 by the vibration applied after the input. The vibration generated by the second vibration source 16 is capable of adjusting the frequency, because the amount of vibration required and the input amount of the light aggregate is different depending on the state of the light weight aggregate paste. Therefore, it is desirable to allow the frequency to be adjusted to the optimum state.

In addition, the first vibration source 14 is connected to the mold 12, and the vibration generated from the first vibration source 14 is applied to the mold 12. Under such vibration conditions, when the mold 12 vibrates after the frame 12 touches the lightweight aggregate, the vibration is applied to the lightweight aggregate through the mold, especially between the lightweight aggregates in the interior of the lightweight aggregate paste. The advantage is that the spacing is adjusted and the distribution is uniform.

On the other hand, the frequency of the vibration generated by the first vibration source 14 is higher than the frequency of the vibration generated by the second vibration source 16. This is because the vibration generated by the first vibration source 14 has a major influence on the surface of the lightweight aggregate so that the surface of the sound absorbing member is uniformly adjusted, whereas the vibration generated by the second vibration source 16 is light Aggregate is to spread evenly inside the box 11 because the role is different. In addition, when a large amount of vibration generated from the vibration source as a whole, since a number of voids formed inside the sound absorbing member is blocked, the absorption efficiency of noise decreases, so that an appropriate amount of vibration is applied to prevent such a phenomenon. It is important.

In addition, a pressurizing source 15 is connected to the mold 12, and the mold 12 is pushed downward by the pressurizing source 15, and is light-weighted by pressure applied downward by the mold 12. Aggregate may be manufactured in a predetermined shape to shape the sound absorbing member.

3 illustrates in detail the process of molding the sound absorbing member after the lightweight aggregate paste is added. First, lightweight aggregate is first injected (21). After the first lightweight aggregate is input, the mold 12 is pressed downward by operating the pressure source 15 in a state where vibration is applied by the first vibration source 14 and the second vibration source 16. (22). At this time, the frequency of the vibration applied by the second vibration source 14 is applied for a low and short time and then terminates the operation. The vibrations applied by the first vibration source 14 are continuously applied while the mold 12 is pushed toward the box 16 by the pressure source 15.

After the first vibration / pressurization is completed by the above-described process, the mold 12 is moved upwards, and then a light weight aggregate paste mold is secondly introduced into the box 11 (23). As such, when the second light weight aggregate is input again, the light aggregate is continuously stacked above the first light weight aggregate.

As such, the process of putting the light weight aggregate into the second side again on the upper side of the first molded light weight aggregate is performed in order to satisfy the thickness required in the condition of the light weight aggregate. This is because the pressure applied by 12) is not transmitted to the lower side as a whole, and if the pressure is not transmitted in this way, the light weight aggregate paste does not aggregate and the strength is weakened. Furthermore, this is a further required process as it is provided dry so that the voids in the lightweight aggregate paste are preserved.

As described above, after the second light weight aggregate is input, secondary vibration and pressure are performed (24). At this time, the vibration by the second vibration source 16 is not applied but only the pressure by the first vibration source 14 is applied. The vibration is not applied by the second vibration source 16 as described above because if the vibration is applied again by the second vibration source 16, the bonding and the shape between the first and the first aggregated lightweight aggregate particles may be damaged. to be.

After the secondary vibration and pressurization is performed, the lower plate 13 is removed to remove and move the sound absorbing member formed in the box 11 (25). The moved sound absorbing member hardens through the curing process (26). When the sound absorbing member is cured, the whitening phenomenon should not be generated on the surface of the sound absorbing member, which is not preferable because the color of the sound absorbing member formed by the color pigment is changed when the whitening phenomenon occurs on the surface of the sound absorbing member. This is because the strength decrease of the sound absorbing member occurs. In order to prevent such whitening phenomenon, it is preferable that the moisture in the curing chamber of the sound absorbing member is kept low, the ventilation is sufficiently performed, and the curing is quick by heat.

According to the present invention as proposed, since the internal voids of the sound absorbing member are sufficiently maintained in the internal voids of the lightweight aggregate or the gap between the light aggregates, the sound absorbing performance of the sound absorbing member is sufficiently maintained. Can be. Furthermore, since the joining member connecting the lightweight aggregates can be sufficiently connected to the gap between the lightweight aggregates, there is an advantage that the strength of the sound absorbing member can also be sufficiently maintained.

The invention may further have other embodiments that fall within the scope of the same idea, for example, the process of vibration in the primary vibration / pressure process may not be necessary. In particular, the vibration applied by the second vibration source 16 may not be applied, which means that when the amount of lightweight aggregate paste introduced into the box 11 is small, the lightweight aggregate is dared into the box 11. Not only do not need to spread evenly, but because the vibration applied to a small amount of lightweight aggregate, the voids of the lightweight aggregate may be blocked.

In addition, in the present invention, it is described that the input and vibration / pressure step of the light aggregate is performed twice, but is not limited to this may be performed three or more times to produce a thicker sound absorbing member.

According to the present invention, it is possible to obtain the advantage that the sound absorbing performance of the sound absorbing member is improved.

In addition, since the small voids in the lightweight aggregate and the relatively large voids between the lightweight aggregates can be maintained intact even when the sound-absorbing member is completed without being damaged, the sound-absorbing performance is improved, and the soundproofing effect is obtained while the area is reduced during installation. Can be.

In addition, the strength is improved by using a light aggregate, but the chemical stability is high, the service life is long.

In addition, since the lightweight aggregate paste is laminated in a plurality of layers during the manufacturing process of the sound absorbing member, it is possible to obtain a high sound absorbing effect while increasing the strength of the sound absorbing member.

Claims (5)

Putting the lightweight aggregate paste into a box and pressurizing it first by a mold; And Method of manufacturing a sound absorbing member comprising the step of further pressing the secondary light weight aggregate paste into the secondary secondary light weight aggregate paste. The method of claim 1, A second vibration source and a first vibration source are respectively connected to the box and the mold to apply vibration to the box and the mold, respectively. At least in the secondary pressing step, the vibration is applied only by the first vibration source. The method of claim 2, The vibration frequency of the vibration applied by the first vibration source is higher than the vibration frequency of the vibration applied by the second vibration source, the frequency of the second vibration source is a manufacturing method of the sound absorbing member is adjustable. Light weight aggregate paste is repeatedly carried out in the process of pressing to form a plurality of layers, The lightweight aggregate paste is a sound absorbing member that is a dry lightweight aggregate paste manufactured by mixing lightweight aggregate with cement and water. The method of claim 4, wherein The light-weight aggregate paste is a sound absorbing member that is further added color pigments and glass fibers.

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