JPH10231566A - Sound absorbing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance strength by providing a porous concrete part formed by kneading aggregate and a cement group binder and molding it, and a high strength concrete part with tendons embedded in high strength concrete. SOLUTION: Aggregate is formed of crushed material of unglazed brick, crushed stone of natural pumice and burned beads of waste plastic, waste glass, or the like. The aggregate is kneaded with a cement group binder and molded on a slab from the from a porous concrete part 1 with parts 4a of cavities 4 continuous in the lengthwise direction of a concrete plate body. A plurality of tendons 3 such as prestressing wires are disposed in a tensed state on the porous concrete part 1, and high strength concrete is placed in the form the embed the tendons 3. After the concrete is hardened, the tendons 3 are cut to impart presser, and a high strength concrete part 2 is formed to form a sound absorbing plate 5 with the cavities 4. Strength can therefore be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing plate used for a floor or a wall in a concrete structure.

[0002]

2. Description of the Related Art Conventionally, a sound-absorbing plate has a specially connected hole inside by mixing an appropriate amount of aggregate having a fixed particle size into an unsaturated polyester resin to form a hardened material, thereby obtaining a sound-absorbing characteristic. Sound absorbing material for high-quality concrete boards (Japanese
-23101) and a plurality of concave portions formed on the back surface of the porous concrete plate to enclose the air storage space, and a hole communicating from the concave portion to the surface of the concrete plate is provided, so that the workability is high, and A sound absorbing plate having a high sound absorbing property up to a low frequency region (Japanese Patent Application Laid-Open No. Hei 8-13644) is known.

[0003]

Although these sound absorbing plates use porous concrete, they are usually considered to be used for walls, so that sound absorbing performance is enhanced and strength is improved for floors. There is no known character.
A sound absorbing plate using a resin or the like as a binder has poor durability against ultraviolet rays and the like, cannot be used outdoors, and has no fire resistance. Furthermore, the latter concrete system in the conventional example has a problem that the area of the continuous holes effective for sound absorption is low relative to the entire wall surface, so that the sound absorption is low and the strength is low, so that it cannot be used with a long material. .

As described above, the conventional sound absorbing plate made of a porous concrete plate has a problem to be solved in improving strength and workability.

[0005]

The gist of the present invention for solving the above-mentioned problems of the sound-absorbing plate according to the present invention is to provide at least a porous concrete portion of a porous hardened material formed by kneading an aggregate and a cement binder. And a high-strength concrete part in which a plurality of tendon members for prestress are embedded in high-strength concrete.

The high-strength concrete portion is sandwiched between porous concrete portions to form a sandwich; a plurality of cavities continuous in the longitudinal direction of the sound absorbing plate are arranged in parallel in the high-strength concrete. A part of the continuous cavity is provided in the porous concrete portion, and a plurality of the continuous cavities are provided in parallel in the high-strength concrete; It is one selected from crushed bricks, crushed natural pumice stones, sludge fired beads, fired beads such as waste plastic or waste glass, and styrene foam beads.

According to the sound-absorbing plate of the present invention, high-frequency sound is mainly absorbed in the porous porous concrete portion, and the high-strength concrete portion strongly resists a load. Not only can it be used for a long time, but it can also be used as a long floor material whose ceiling surface has sound absorbing performance. Also, by arranging the porous concrete portion in a sandwich shape, a sound absorbing effect is exerted on both sides of the wall. Further, by providing continuous cavities in high-strength concrete, low-frequency sound is absorbed. By making the aggregate selected from wood chips and the like, the sound absorbing performance can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a sound absorbing plate according to the present invention will be described in detail with reference to the drawings. In the first embodiment of the present invention, as shown in FIG. 1, at least a porous hardened porous concrete section 1 formed by kneading an aggregate and a cement-based binder, and a high-strength concrete. It comprises a high-strength concrete part 2 in which a plurality of tendons 3 for stress are embedded.

[0009] The porous concrete section 1 is one in which aggregate is kneaded with a cement-based binder and molded on a horizontal slab form (bed) in a factory. At this time, a part 4a of the cavity 4 which is continuous in the longitudinal direction of the concrete plate body
To form The porous concrete section 1 mainly absorbs sound in a high frequency region.

In order to form a part 4a of the cavity 4, a porous concrete is slab-molded by using a setting machine which moves in the machine direction while pouring concrete from a setting port into a formwork. When casting into a frame, a plurality of shapes for a long hole having the same shape as the cavity 4 are arranged side by side in the horizontal direction near the casting hole, and the lower portion of the shape is inserted into the upper portion of the porous concrete. And forming a part 4a of the cavity 4 in the upper part of the concrete cast at the lower part of the long hole shape material while casting concrete.

The tension member 3 is, for example, a PC steel wire,
A required tension is previously provided by a jack provided between the abutments provided at both ends in the longitudinal direction of the slab formwork. In the embodiment shown in FIG. 1, the upper surface of the high-strength concrete portion 2 is a floor surface, and the lower surface of the porous concrete portion 1 is a ceiling surface of a lower floor, whereby a tensile force acts on a lower portion of the high-strength concrete portion 2. Therefore, the tendon 3 is disposed below the high-strength concrete section 2.

The high-strength concrete part 2 is, for example,
After the porous concrete portion 1 is formed, a plurality of the tension members 3 are tensioned, a plurality of the tension members 3 are erected between the abutments, and a high-strength concrete is cast by a concrete casting machine while using a long hole forming member forming the cavity 4. It is cast on the porous concrete part 1 from the casting hole and is formed by an immediate removal method.

After the high-strength concrete portion 2 is formed and hardened in this way, the tendon 3 is cut at a predetermined location, a prestress is applied to the concrete plate, and the concrete plate is released from the slab form. Is formed. Alternatively, the high-strength concrete portion 2 may be cast first, and the porous concrete portion 1 may be cast thereon, and then turned over after completion.

The sound absorbing plate 5 is used as a wall material or a flooring material having soundproofing properties, so that high-frequency sound is absorbed by the porous concrete portion 1 and a part thereof is provided in the porous concrete portion 1. The cavity 4 absorbs the low-frequency sound transmitted from the porous concrete portion 1 and is excellent in sound absorption, and is sound-insulated by the high-strength concrete portion 2 to be a plate material excellent in both sound absorption and sound insulation. . In addition, the high-strength concrete portion 2 and the tendon 3 alleviate the tensile force acting on the sound absorbing plate 5 by the heavy object with prestress, thereby improving the proof stress. The presence of the cavity 4 also reduces the weight of the sound absorbing plate 5 and improves the efficiency of transportation and laying work.

As shown in FIG. 2, the second embodiment of the present invention differs from the first embodiment in that the tension members 3 are arranged in a staggered manner with the cavity 4 interposed therebetween. This is an embodiment in which is formed. The cavity 4 may be provided only inside the high-strength concrete part 2 or a part of the cavity 4 may be provided in the porous concrete part 1, but is preferably provided in the porous concrete part 1. Therefore, the sound is effectively propagated to the cavity 4 so as to absorb the low frequency sound.

In general, the porous concrete portion 1 has high sound absorption, but low sound insulation, and the high strength concrete portion 2 has high sound insulation but low sound absorption. Therefore,
As in the second embodiment, it is used when sound absorption is required but high sound insulation is required. Further, the cavity 4 can be made smaller and the thickness of the sound absorbing plate can be appropriately adjusted with respect to the required amounts of the sound absorption and the sound insulation.

In the staggered arrangement of the tendon members 3 in the second embodiment, the tendon member 3 is virtually disposed at an intermediate position between the upper and lower positions by the tendon member 3 at the upper position and the tendon member 3 at the lower position. It works as follows. As described above, the position at which the prestress is applied by the tendon 3 can be adjusted.

In the third embodiment of the present invention, as shown in FIG. 3, a porous hardened porous concrete portion 1 formed by kneading an aggregate and a cement-based binder and forming the same in a high-strength concrete. A sound absorbing plate 5c composed of the high-strength concrete portion 2 in which a plurality of tension members 3 for stress are embedded is formed.

This embodiment is similar to the sound absorbing plate 5 of the first embodiment.
In contrast, a sound absorbing plate 5c in which the cavity 4 is omitted. Although the cavity 4 is excellent in absorbing low-frequency sound, it is inferior in sound insulation of low-frequency sound. Therefore, when not only sound absorption but also low-frequency sound insulation is required, the cavity 4 according to the third embodiment is used. The sound absorbing plate 5c is used.

In the sound absorbing plate 5c, the high-frequency sound is absorbed by the porous concrete portion 1 and the sound insulating property is enhanced by the high-strength concrete portion 2 to thereby improve the sound absorbing plate 5c.
Even when is used as a floor material, the sound insulation and the strength against a load are improved by the high-strength concrete portion 2 and the tension member 3 buried therein. Of course, the thickness of the sound absorbing plate 5c can be adjusted depending on the required performance.

In order to enhance the sound insulation performance of the sound absorbing plate 5c, the high-strength concrete portion 2 is made thick. In order to enhance the sound absorbing performance, the thickness of the porous concrete portion 1 is increased.
In the case where sound is absorbed up to a low frequency range (low frequency) without changing the usage amount of the porous concrete, the first embodiment and the second embodiment can be used.
As in the embodiment, the cavity 4 is provided or the cavity 4 is provided.
Is further enlarged.

When the sound absorbing plate receives various loads, the cavity 4 becomes negative in proof stress. Therefore, in such a case, in the first embodiment and the second embodiment,
The size of the cavities 4 is reduced or the number of the cavities 4 is reduced with respect to the load to be borne, and the design is appropriately changed and adjusted by completely eliminating the cavities as in the third embodiment.

As shown in FIG. 4, the fourth embodiment of the present invention differs from the third embodiment in that a high-strength concrete portion 2 is provided.
Is formed in a sandwich shape by being sandwiched between the porous concrete portions 1 and 1 to form a sound absorbing plate 5d.

If this sound absorbing plate 5d is used, the porous concrete portions 1 and 1 are present on both surfaces thereof, which is preferable when both adjacent rooms are soundproof rooms. Further, as a fifth embodiment, as shown in FIG. 5, there may be a case where sound absorbing plates 5e and 5f provided with a cavity 4 are provided. The cavity 4 effectively absorbs low frequency sound.

In the sixth embodiment of the present invention, the aggregate in the porous concrete portion 1 of the sound absorbing plate of the first to fourth embodiments is made of wood chips, crushed unfired bricks, crushed natural pumice stones, sludge fired beads, and waste. It is one selected from fired beads such as plastic or waste glass, and styrofoam beads.

Using such an aggregate, the sound absorbing plates 5, 5
By forming the porous concrete part 1 at a,... 5f, the sound absorbing performance of the porous concrete part 1 is improved.

[0027]

As described above, the sound-absorbing plate according to the present invention has at least a porous hardened porous concrete portion formed by kneading an aggregate and a cement-based binder, and a high-strength concrete. It is made of high-strength concrete with a plurality of prestressing materials embedded in it, so the high-strength concrete part strongly resists loads. This has an excellent effect of providing a high-yield sound-absorbing plate that can be used widely as a floor material having the same.

Further, the porous concrete portion having high sound absorbing properties and the high strength concrete portion having high sound insulating properties are combined,
This has the effect of providing a sound absorbing plate that is excellent in both sound absorbing and sound insulating properties.

By sandwiching the high-strength concrete part between the porous concrete parts and forming it in a sandwich shape, it has an excellent sound-absorbing effect on both sides of the wall to enhance workability when constructing an adjacent soundproof room. It has the effect that it has.

Further, since a plurality of cavities that are continuous in the longitudinal direction of the sound absorbing plate are provided in parallel in the high-strength concrete, high-frequency sound can be insulated, and low-frequency sound can be efficiently transmitted. It has an excellent effect of becoming a sound absorbing plate that absorbs.

The cavity continuous in the longitudinal direction of the sound absorbing plate is partially provided in the porous concrete portion,
Since multiple low-frequency sounds transmitted through the porous concrete part are absorbed in the cavity without being reflected at the mating surface with the high-strength concrete part, since a plurality of them are provided in parallel in the high-strength concrete, It has an excellent effect that the sound of the frequency is more efficiently absorbed.

The aggregate is any one selected from wood chips, crushed unfired bricks, crushed natural pumice stones, sludge fired beads, fired beads such as waste plastic or glass, and styrene foam beads. Thereby, an excellent effect that the sound absorbing performance can be improved is achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sound absorbing plate according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a sound absorbing plate according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a sound absorbing plate according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a sound absorbing plate according to a fourth embodiment of the present invention.

FIGS. 5A and 5B are sectional views (A) and (B) of a sound absorbing plate according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 Porous concrete part, 2 high-strength concrete part, 3 tendon material, 4 cavity, 5, 5a, 5b, 5c, 5
d, 5e, 5f Each sound absorbing plate according to the present invention.

Claims (5)

[Claims] 1. A high-strength porous concrete part formed by kneading an aggregate and a cement-based binder and molding, and a plurality of tendon materials for pre-stress embedded in high-strength concrete A sound absorbing plate comprising a concrete part. 2. The sound absorbing plate according to claim 1, wherein the high-strength concrete portion is sandwiched between the porous concrete portions to form a sandwich. 3. The sound absorbing plate according to claim 1, wherein a plurality of cavities continuous in the longitudinal direction of the sound absorbing plate are provided in parallel in the high-strength concrete. 4. The cavity continuous in the longitudinal direction of the sound absorbing plate, a part of which is provided in the porous concrete portion, and a plurality of cavities are provided in parallel in the high-strength concrete. 3. The sound absorbing plate according to 1 or 2. 5. The aggregate is any one selected from wood chips, crushed unfired bricks, crushed natural pumice stone, fired sludge beads, fired beads of waste plastic or glass, and styrofoam beads. The sound-absorbing plate according to claim 1, 2, 3, or 4, wherein