JPH0721686Y2 - Sound insulation concrete panels and walls - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a sound insulation concrete panel and a sound insulation wall used for walls of buildings.

"Prior Art" Conventionally, as a wall body used in a concrete building structure, a single-layer concrete wall made of cast-in-place concrete or two relatively thin sets of concrete panels are arranged at intervals. Hollow sound insulation walls are known.

By the way, when the wall thickness is increased in order to increase the transmission loss (TL) of the wall body, there may be a valley portion where the TL value is smaller than the theoretical value indicated by the mass law. (See Figure 11). The cause of such valleys is considered to be due to the resonance phenomenon in which the wavelength of the sound obliquely incident on the wall surface and the wavelength of the propagating bending vibration of the plate caused by it coincide with each other. It is called the coincidence effect. The frequency range in which such a coincidence effect occurs is called the coincidence range. And is inversely proportional to the square root of Young's modulus.

From the above, heavy (high density), soft (small Young's modulus), thin (thin plate thickness) material has a high critical frequency, and conversely, light, hard, thick material has a low critical frequency. You can see. Especially for materials with a thickness of 50 mm or more due to manufacturing or work problems, such as lightweight concrete, the limit frequency is 100 to 1
Since it is at 000Hz, it may cause problems with sound insulation.

Therefore, recently, as shown in FIG. 12, a plurality of reinforcing ribs 2 which are parallel to each other are formed on one surface of a concrete panel 1 used as a wall body to form thick peaks and thin valleys. By providing the portions alternately, the single concrete panel 1 has the characteristics of two types of walls with different wall thicknesses, thereby dispersing the coincidence region into two frequency regions and reducing the coincidence effect at a specific wavelength. Attempts were also made.

[Problems to be Solved by the Invention] However, in the concrete panel 1 provided with the reinforcing ribs 2 as described above, there is no means for reducing the coincidence effect itself in principle. The coincidence effect may not be effectively attenuated depending on various conditions such as the wall thickness and the distance between the reinforcing ribs 2. In addition, the above concrete panel 1
Can be thought of as having multiple grooves formed on one side of a thick concrete panel with a uniform wall pressure, so it is possible to obtain a high sound insulation effect even if it is lighter than a concrete panel with a uniform thickness. However, since the groove is formed in one direction, the strength is reduced, and in order to secure the required strength, reinforcement with a wire mesh or the like was essential.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sound insulating concrete panel and a sound insulating wall which can reduce the coincidence effect in principle and which is light and has high strength.

"Means for Solving the Problem" The sound insulating concrete panel of the present invention is a concrete panel reinforced by a plurality of reinforcing ribs, wherein one surface has a plurality of damping ribs each having a flat surface with a predetermined width. A plurality of reinforcing ribs are formed in parallel with each other at a predetermined interval, and a plurality of reinforcing ribs are formed in a thin portion between the respective damping ribs so as to span the damping ribs, and between the top portions of adjacent damping ribs. The inner dimension is set smaller than 1/4 wavelength of the wavelength corresponding to the critical frequency of the coincidence effect, and the outer dimension between the tops of the damping ribs is set larger than the above 1/4 wavelength. It is a thing.

In addition, another sound-insulating concrete panel of the present invention is a concrete panel reinforced by a plurality of reinforcing ribs,
A plurality of damping ribs each having a flat surface with a predetermined width dimension on one surface are formed in parallel with each other at a predetermined interval, and the thin ribs between the respective damping ribs are stretched between the damping ribs. With a plurality of reinforcing ribs formed on the inner side, the inner dimension between the tops of the adjacent damping ribs is set to be smaller than 1/8 of the wavelength corresponding to the limit frequency of the coincidence effect,
In addition, the outer dimension between the tops of the damping ribs is set to be larger than the above 1/8 wavelength.

Furthermore, another sound-insulating concrete panel of the present invention is a concrete panel reinforced by a plurality of reinforcing ribs, wherein a plurality of vibration damping ribs whose one surface is a flat surface having a predetermined width dimension are parallel to each other. A plurality of reinforcing ribs are formed at intervals, and a plurality of reinforcing ribs are formed so as to span the damping ribs in the thin portion between the damping ribs, and the inner dimension between the tops of the adjacent damping ribs is , 1/12 wavelength of the wavelength corresponding to the limit frequency of the coincidence effect is set, and the outer dimension between the tops of the damping ribs is the above.
It is set larger than 1/12 wavelength.

On the other hand, the sound insulation wall of the present invention is composed of two sets of wall portions configured by connecting a plurality of any of the above sound insulation concrete panels, and the wall portions are arranged in parallel with a predetermined space between them. In a sound insulation wall with a hollow portion provided in each of the sound insulation concrete panels, connecting ribs protruding in the same direction as the vibration damping ribs are formed at both end portions of each sound insulating concrete panel, and the connecting ribs at both end portions are directed toward the hollow portion. The sound insulation concrete panels are connected by connecting the connecting ribs.

"Operation" In the sound insulation concrete panel of the present invention, the inner dimension between the tops of the adjacent damping ribs is set to be smaller than 1/4 wavelength of the wavelength corresponding to the limit frequency of the coincidence effect, and between the tops. Since the outer dimension of is set to be larger than the above 1/4 wavelength, when a sound wave in the coincidence region is incident, the peaks and nodes of the bending wave propagating inside the sound insulation concrete panel are simultaneously formed by each damping rib. As a result, the reduction of the transmission loss due to the coincidence effect is suppressed, and the sound insulation performance is improved.

Similarly, in the other two types of sound insulation concrete panels of the present invention, the peaks and nodes of the bending waves propagating inside the concrete panels are simultaneously suppressed by the respective damping ribs (in this case, among the respective damping ribs, Every other or every two damping ribs suppress the peaks and nodes, and the reduction of the transmission loss due to the coincidence effect is suppressed, and the sound insulation performance is improved.

On the other hand, in the sound insulation wall of the present invention, since it is composed of a wall portion configured by connecting a plurality of any of the above sound insulation concrete panels, a decrease in transmission loss due to the coincidence effect is suppressed, and the two wall portions are combined. Is provided,
Moreover, since the wall portions are arranged in parallel at a predetermined interval and the hollow portion is provided between them, the sound insulation performance is improved and the weight is reduced as compared with the single-layer sound insulation wall.
Furthermore, in this sound insulation wall, each sound insulation concrete panel can be self-supported by forming connection ribs projecting in the same direction as the vibration damping ribs at both ends of each sound insulation concrete panel. Therefore, by connecting the sound-insulating concrete panels by connecting the connecting ribs to each other in a state where the connecting ribs are directed to the hollow portion, the assembly can be easily performed without studs and the appearance is also good.

[Embodiment] Hereinafter, a first embodiment of the sound insulating concrete panel of the present invention will be described with reference to FIGS. 1 to 4.

A plurality of sound insulation concrete panels 3 of this embodiment are connected to form a sound insulation wall.
As shown in the figure, the connecting rib 4 is formed in a rectangular shape at both ends thereof and protrudes to one surface, and a vibration suppressing rib 5 extending in the vertical direction along the one surface and a lateral direction. A plurality of reinforcing ribs 6 extending in parallel to each other are provided in parallel with each other at a predetermined interval, and these ribs are formed in a lattice shape orthogonal to each other.

Then, in this sound-insulating concrete panel 3, as shown in FIG. 3, the top portions 7 of the respective damping ribs 5 are flat surfaces having a predetermined width dimension, and the top portions 7 of the respective neighboring damping ribs 5, 5 are formed. , The internal dimension l ₁ between 7 is set smaller than 1/4 wavelength of the wavelength corresponding to the critical frequency of the coincidence effect,
Moreover, the outer dimension l ₂ between the tops 7, 7 is set to be larger than the above-mentioned 1/4 wavelength.

Here, the dimensions of the sound insulation concrete panel 3 that satisfies such conditions will be described with reference to specific examples.

For example, a wall thickness of 15m made of normal concrete (specific gravity 2.3)
Taking a concrete panel of m as an example, the limit frequency of the coincidence effect is 800 Hz, so if the speed of sound is 340 m / s, the wavelength of the bending wave that resonates with the limit frequency is 42.5 cm, of which 1/4 wavelength is about It will be 10.6 cm. Therefore, the inner dimension l ₁ between the tops 7, 7 of the adjacent damping ribs 5, 5 is
If the outer dimension l ₂ is set to 10.6 cm or more and the outer dimension l ₂ is set to 10.6 cm or more, the above condition is satisfied. In order to satisfy such a condition, for example, when the core dimensions of each damping rib 5, 5 are set to 100 mm, the height of the damping rib 5 is set to about 35 mm, The width of the top portion 7 may be about 30 mm, and if necessary, tapering on both sides of each damping rib 5 (and both sides of each reinforcing rib 6) facilitates demolding during manufacturing. Is desirable.

In the sound-insulating concrete panel 3 having such a structure, when a sound wave in the coincidence region is incident, the peaks and nodes of the bending wave propagating inside the sound-insulating concrete panel 3 are simultaneously suppressed by the respective damping ribs 5. As a result, reduction in transmission loss due to the coincidence effect is suppressed, and sound insulation performance is improved. Further, in the case of the sound insulating concrete panel 3 of this embodiment, as shown in FIGS. 1 and 2, the reinforcing ribs 6 are also provided at the same intervals as the vibration damping ribs 5, so that the respective reinforcing ribs are provided. Also with No. 6, the reduction of the transmission loss due to the coincidence effect is suppressed, and thereby the sound insulation performance is further improved. Moreover, since the sound insulating concrete panel 3 has the connecting ribs 4 formed at both ends thereof, the sound insulating concrete panel 3 itself has a self-sustaining structure, and by connecting the connecting ribs 4 to each other, You can easily assemble the sound insulation wall without studs.

In the sound insulating concrete panel 3, the inner dimension l ₁ is set smaller than 1/4 wavelength of the wavelength corresponding to the limit frequency of the coincidence effect, and the outer dimension l ₂ is 1/4 wavelength. However, in the sound insulation concrete panel 3 of this embodiment, the inner dimension is
l ₁ may be set smaller than 1/8 wavelength of the wavelength corresponding to the limit frequency of the coincidence effect, and external dimension l ₂ may be set larger than 1/8 wavelength. ₁
The outer dimension l ₂ may be set smaller than the 1/12 wavelength and larger than the 1/12 wavelength.

FIG. 4 shows a graph comparing the transmission loss of the sound insulation concrete panel 3 of this example with the transmission loss of the conventional concrete panel without the vibration damping rib 5.

According to this graph, in the case of the conventional concrete panel without the vibration damping rib 5, the transmission loss is lower than the theoretical value of the mass law in the frequency range of 600Hz or higher, and obviously due to the coincidence effect especially near 1kHz. Although the transmission loss is considered to be reduced, in the case of the sound insulation concrete panel 3 in which the plurality of damping ribs 5 are provided at the intervals satisfying the above-mentioned conditions, the coincidence also in the above-mentioned frequency range. The decrease in transmission loss due to the effect is not seen, and the trajectory is almost the same as the theoretical value of mass law.

In the case of manufacturing such a sound insulating concrete panel 3, concrete may be simply poured into a mold or may be manufactured by a press molding method, but in the case of mass production, a mold roller is used. It is desirable to manufacture by extrusion by using such as.

The concrete used as the material for the sound insulation concrete panel 3 may be ordinary concrete, but it is preferable to use lightweight concrete such as ALC (lightweight cellular concrete). When the sound insulation concrete panel 3 is made of lightweight concrete,
Since it is lightweight, it is easy to transport and also has good workability.

In addition, the sound insulation concrete panel 3 made of ordinary concrete or lightweight concrete in this way
Since its one surface is reinforced by the damping ribs 5 and the reinforcing ribs 6, it is not necessary to reinforce using a wire mesh or the like unlike a conventional concrete panel, and even if no reinforcing material is used. Although good, it is desirable to mix vinylon fibers in the case of reinforcement, for example, when the soundproof concrete panel 3 is used as a partition wall. Further, when the sound insulating concrete panel 3 is used as an outer wall of a building or the like, steel fiber, glass fiber, carbon fiber or the like may be mixed into the sound insulating concrete panel 3, particularly in the case of a large size. It can be reinforced with metal lath, wire mesh, etc.

FIG. 5 is a view showing a sound insulating concrete panel according to a second embodiment of the present invention.

In the sound-insulating concrete panel 3a of this embodiment, a plurality of ribs extending in the left-right direction are used as the vibration damping ribs 5, and the reinforcing ribs 6 laid between the respective vibration damping ribs 5 are staggered. .

FIG. 6 is a view showing a sound insulation concrete panel according to a third embodiment of the present invention.

In the sound-insulating concrete panel 3b of this embodiment, the vibration damping ribs 5 and the reinforcing ribs 6 are formed in a lattice shape orthogonal to each other while being inclined.

FIG. 7 is a view showing a sound insulation concrete panel according to a third embodiment of the present invention.

In the sound-insulating concrete panel 3c of this embodiment, the damping ribs 5 are formed to extend in the left-right direction, and the reinforcing ribs 6 spanned between the damping ribs 5 are oblique to the damping ribs 5. It is formed in a tilted state.

Next, as an embodiment of the sound insulation wall of the present invention, the above-mentioned first
A sound insulation wall constructed by using the sound insulation concrete panel 3 of the embodiment will be described with reference to FIGS. 8 to 10.

In the sound insulation wall of this embodiment, as shown in FIG. 8, two sets of wall portions 8 formed by connecting a plurality of sound insulation concrete panels 3 are arranged in parallel at a predetermined interval, and a hollow portion therebetween. Insulation fiber 10 is provided on each of the sound insulation concrete panels 3, and each of the sound insulation concrete panels 3 has a connecting rib 4 at both ends thereof.
Is connected to the hollow portion 9 by connecting the connecting ribs 4 to each other.

And, as shown in FIG. 9, both ends of this sound insulation wall are
The connecting ribs 4 and 4 of the sound insulation concrete panels 3 and 3 located at both ends of the wall portions 8 and 8 closely adhere to the side surfaces of the structural material 11 (pillar or outer wall, etc.) of the building, and the connecting ribs 4 and Four
Caulking 12 is applied on the outside of.

In this sound insulation wall, since the sound insulation concrete wall 3 is formed by connecting a plurality of sound insulation concrete panels 3, a decrease in transmission loss due to the coincidence effect is suppressed, and two sets of the wall parts 8 are provided and those wall parts are provided. Since 8 and 8 are arranged in parallel at a predetermined interval and the heat insulating fiber 10 is provided in the hollow portion 9 between them, the sound insulation performance is improved and the weight is reduced as compared with the single-layer sound insulation wall. Moreover,
In this sound insulation wall, since each sound insulation concrete panel 3 can stand on its own, the sound insulation concrete panel 3 is connected by connecting the connection ribs 4 with the connection rib 4 facing the hollow portion. By doing so, it is easy to assemble without studs, and the appearance is also good.

FIG. 10 shows a graph comparing the transmission loss of a sound insulation wall constructed by using the sound insulation concrete panel 3 of the present invention and the transmission loss of a sound insulation wall constructed by a conventional concrete panel without the damping rib 5. .

According to this graph, it can be seen that the sound insulation wall constructed by using the sound insulation concrete panel 3 of the present invention has improved sound insulation performance as compared with the sound insulation wall constructed by the conventional concrete panel without the vibration damping ribs 5. .

In this embodiment, the sound insulating concrete panel of the present invention constitutes the sound insulating wall, but the sound insulating concrete panel of the present invention can be widely used not only as the sound insulating wall but also as a material for the outer wall. In that case, connecting ribs may be formed on all four ends of the sound insulating concrete panel, or no connecting ribs may be provided at all.

"Effect of device" According to the sound insulation concrete panel of this device, the inner dimension between the tops of the adjacent damping ribs is set smaller than 1/4 wavelength of the wavelength corresponding to the limit frequency of the coincidence effect, and Since the outer dimension between the tops is set to be larger than the above 1/4 wavelength, when a sound wave in the coincidence region is incident, the peaks and nodes of the bending wave propagating inside the sound insulation concrete panel are suppressed. The ribs can simultaneously suppress the sound loss, thereby suppressing the decrease in transmission loss due to the coincidence effect and improving the sound insulation performance.

Similarly, also in the other two types of sound insulation concrete panels of the present invention, the peaks and nodes of the bending waves propagating inside can be simultaneously suppressed by the respective damping ribs (in this case, among the respective damping ribs, Since every other or every two damping ribs suppress the peaks and nodes, these sound-insulating concrete panels 3 can also suppress a decrease in transmission loss due to the coincidence effect, thereby improving sound-insulating performance. it can.

In addition, since these three types of sound insulation concrete panels are reinforced with vibration damping ribs and reinforcing ribs, even if lightweight concrete is used as a material to reduce the weight, steel fiber or wire mesh No need to use stiffeners.

On the other hand, according to the sound insulation wall of the present invention, since it is composed of a wall portion formed by connecting a plurality of any of the above sound insulation concrete panels, it is possible to suppress the reduction of the transmission loss due to the coincidence effect and at the same time, the wall portion. Since two sets are provided, and the wall portions are arranged in parallel at a predetermined distance and a hollow portion is provided therebetween, it is possible to improve the sound insulation performance and to reduce the weight compared with a single-layer sound insulation wall. it can. Moreover, in this sound insulation wall, since the connection ribs protruding in the same direction as the vibration damping ribs are formed at both ends of each sound insulation concrete panel, each sound insulation concrete panel can be self-supporting by itself. Therefore, by connecting the sound insulation concrete panels by connecting the connecting ribs in a state where the connecting rib is directed to the hollow portion, it is possible to easily assemble without studs,
In addition, a good appearance can be obtained.

[Brief description of drawings]

1 to 7 are views for explaining a sound insulation concrete panel of the present invention, FIG. 1 is a perspective view of the sound insulation concrete panel of the first embodiment, FIG. 2 is a rear view of the same, and FIG.
2 is a sectional view taken along the line AA in FIG. 2, FIG. 4 is a graph comparing the transmission loss thereof with a conventional concrete panel, FIG. 5 is a rear view of the sound insulating concrete panel of the second embodiment, and FIG. The back view of the sound insulation concrete panel of 3rd Example, 7th
The figure is a back view of the sound insulating concrete panel of the third embodiment. 8 to 10 are views for explaining the sound insulation wall of the present invention. FIG. 8 is a plan sectional view of the sound insulation wall, FIG. 9 is a sectional view of the main part thereof, and FIG. 10 shows its transmission loss. It is a graph compared with the conventional sound insulation wall. FIG. 11 is a graph explaining the coincidence effect. FIG. 12 is a perspective view showing an example of a conventional sound insulation concrete panel. 3 ... Sound insulation concrete panel, 4 ... Connecting rib, 5 ...
… Vibration damping ribs, 6 …… Reinforcing ribs, 7 …… Top part, 8 …… Wall part, 9 …… Hollow part, 10 …… Insulating fiber, 11 …… Structural material, 12
…… Caulking.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Teruo Kondo 2-1-16 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Nobuyuki Tanaka 2--16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takeshi Morita 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) Reference JP-A-55-85750 (JP, A)

Claims (4)

[Scope of utility model registration request] 1. A concrete panel reinforced by a plurality of reinforcing ribs, wherein a plurality of damping ribs, each of which has a top portion of a flat surface having a predetermined width dimension, are formed parallel to each other at a predetermined interval, and each of them is formed. A plurality of reinforcing ribs are formed in the thin part between the damping ribs so as to span the damping ribs, and the inner dimension between the tops of adjacent damping ribs corresponds to the critical frequency of the coincidence effect. The sound insulation concrete panel is characterized in that it is set to be smaller than 1/4 wavelength of the wavelength to be controlled, and the outer dimension between the tops of the damping ribs is set to be larger than the above 1/4 wavelength. 2. A concrete panel reinforced by a plurality of reinforcing ribs, wherein a plurality of damping ribs each having a top portion of a flat surface having a predetermined width dimension are formed in parallel with each other at a predetermined interval on one surface thereof. A plurality of reinforcing ribs are formed in the thin part between the damping ribs so as to span the damping ribs, and the inner dimension between the tops of adjacent damping ribs corresponds to the critical frequency of the coincidence effect. The sound insulation concrete panel is characterized in that it is set to be smaller than 1/8 wavelength of the wavelength to be set, and the outer dimension between the tops of the damping ribs is set to be larger than the above 1/8 wavelength. 3. A concrete panel reinforced with a plurality of reinforcing ribs, wherein a plurality of damping ribs each having a top portion of a flat surface having a predetermined width dimension are formed in parallel with each other at predetermined intervals on one surface of the panel. A plurality of reinforcing ribs are formed in the thin part between the damping ribs so as to span the damping ribs, and the inner dimension between the tops of adjacent damping ribs corresponds to the critical frequency of the coincidence effect. The sound insulation concrete panel is characterized in that it is set to be smaller than 1/12 wavelength of the wavelength to be controlled, and the outer dimension between the tops of the damping ribs is set to be larger than the above 1/12 wavelength. 4. A pair of wall portions formed by connecting a plurality of the sound insulation concrete panels according to claim 1, 2 or 3, wherein the wall portions are arranged in parallel at a predetermined interval and between them. In a sound insulating wall having a hollow portion provided in each of the sound insulating concrete panels, connecting ribs projecting in the same direction as the vibration damping ribs are formed at both end portions of each sound insulating concrete panel, and the connecting ribs at both end portions are directed to the hollow portion. The sound insulation wall is characterized in that each sound insulation concrete panel is connected by connecting the connecting ribs.