JPH11350632A - Sound insulating method and its structure for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulating method and structure for an existing building which insulates the sound against the outside of the building and absorbs the background noise surrounding the building for the existing building having a noise source inside the building. SOLUTION: This sound insulating structure is so formed that a substrate steel material 5 is arranged in the outdoor side of the external wall of an existing building and a sound absorbing and insulating board 1 which has a reinforcing material 2 embedded therein and is composed of light-weight porous concrete material of bulk specific gravity 0.25-0.45 is fixed to the substrate steel material 5. The sound absorbing and insulating board 1 which has the reinforcing material 2 embedded therein and is composed of light-weight porous concrete material of bulk specific gravity 0.25-0.45 is fixed to the outdoor side of the external wall of the existing building via the substrate steel material 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing method for an existing building having a noise source inside the building and for preventing noise outside the building and absorbing background noise around the building. And its soundproof structure.

[0002]

2. Description of the Related Art At the stage of planning and building a building, noise was not expected to be a problem. However, the problem may occur after completion of the building, or even if the building has a noise source inside the building, it will go out of the building. When soundproofing is applied to existing buildings such as factories, rack warehouses, acoustic facilities, etc., which have already been built without the soundproofing measures taken at the time of building construction, install new soundproofing walls or It is common practice to attach a sound insulating material or a sound absorbing material to the inner wall surface to take soundproofing measures. Also, to cover the exterior side of the existing building outer wall,
There was also a method of attaching a soundproofing material such as an iron plate, an extruded plate, and a slate plate. Either way, rebuilding the exterior walls of an existing building is very costly, and such additional work has been done.

[0003]

However, in order to construct a new sound-insulating wall, a certain gap or more is required between the building and an adjacent land, or if the building is a middle-high-rise building, a very high sound-insulating wall is to be constructed. It was often necessary or difficult to achieve. Furthermore, in the case of types of buildings, for example, there is no room on the indoor side such as a multi-story parking lot or the workability is poor, so it is difficult to attach sound insulation or sound absorbing materials to the indoor side wall. There was also. In the case of attaching soundproofing materials such as iron plate, extruded plate, slate plate, etc. to cover the existing outer wall surface, these soundproofing materials are quite heavy, so it is necessary to reinforce the structural frame of the existing building Also, the completed wall after construction became a sound reflection surface, reflecting nearby noise and increasing background noise.

Accordingly, an object of the present invention is to solve the above problems and to provide a soundproofing method and a soundproofing structure for preventing noise inside a building from outside the building and at the same time reducing background noise around the building. I do.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a base steel material is disposed outside the outer wall of an existing building, a reinforcing material is buried, and a bulk specific gravity of the steel is 0.
A soundproofing method for an existing building in which a sound absorbing and insulating plate made of a lightweight porous concrete material of 25 to 0.45 was fixed to the base steel material. Further, a sound absorbing and insulating plate made of a porous concrete material having a buried reinforcing material and a bulk specific gravity of 0.25 to 0.45 is fixed to the outside of the exterior wall of the existing building via a base steel material. A soundproof structure for the building was adopted. The bulk specific gravity in the present invention refers to JIS A5 of the porous concrete material excluding the weight of the internal reinforcing material.
It is a bulk specific gravity in an absolutely dry state according to 416.

The operation of the present invention will be described below. The sound-absorbing and sound-insulating plate has a large bending strength because the reinforcing material is buried inside. Construction is easy. Since the sound absorbing and insulating plate is installed after the base steel material is installed outside the exterior of the existing building's outer wall, it is easy to install and it is possible to provide an air layer of any width between the external wall of the existing building and the sound absorbing and insulating plate. it can.

The sound absorbing and insulating plate is made of a lightweight porous concrete material, so that it can have both sound absorbing performance and sound insulating performance. The sound absorbing and insulating plate is designed to prevent noise inside the building from the outside and to absorb noise around the building. Noise can be reduced. In addition, since the reinforcing material is embedded in the sound absorbing and insulating plate made of the lightweight porous concrete material, the bending strength is greatly improved. The specific gravity of the sound absorbing and insulating plate made of lightweight porous concrete material is 0.25 to 0.25.
Since it is as small as 0.45, even if it is mounted on the outer wall of an existing building, the structural body of the existing building bears a new weight, and there is no need to reinforce the building.

When 30% or more of the open cells are present in the sound absorbing and insulating plate, the sound absorbing performance is enhanced, and when the thickness is 35 mm or more, the lightweight porous concrete material is made of a rigid material to improve the sound insulating performance. Be improved. Furthermore, 10m between the outer wall of the existing building and
If an air layer of m to 500 mm is provided, noise from the inside of the building is reflected in this air layer, is absorbed by the sound absorbing and insulating plate and is attenuated, and further outside the building due to the sound insulating performance of the sound absorbing and insulating plate. In contrast, the noise that leaks out is cut off. Also,
By setting the width of the air layer, it is possible to attenuate a sound of a specific frequency. For example, if it is desired to attenuate low-frequency sounds, the width of the air layer may be increased. When the reinforcing material is a plurality of reinforcing bars, the manufacturing process is easy and the strength of the sound absorbing and insulating plate is further improved.

Hereinafter, embodiments of the present invention will be described based on examples.

Embodiment 1 FIG. 1 is a perspective view showing a state in which a sound absorbing and insulating plate 1 is attached to a thin corrugated steel plate 4a used as an outer wall of a multistory parking lot or the like. The sound absorbing and insulating plate 1 shown in FIG. 1 is a lightweight porous concrete made of calcium silicate having a thickness of 50 mm and a reinforcing steel bar 2 embedded therein, and is made of JIS A5.
It has a bulk specific gravity of 0.36 in an absolutely dry state according to 416, and contains 85% of open cells. Therefore, it is an excellent sound-absorbing and insulating plate 1 that is high-strength, lightweight, and has both sound insulation and sound absorption performance. As the reinforcing material 2 to be buried, a reinforcing bar, a wire net, a lath net, a bundle of carbon fibers or aramid fibers, or the like can be used.

The sound absorbing and insulating plate 1 has a bulk specific gravity of 0.25 to 0.25.
Those having a range of 0.45 are lightweight and have sufficient strength and sound insulation performance as a rigid body, which is sufficient. The bulk specific gravity is 0.
If it is less than 25, it is not preferable in terms of strength and sound insulation, and if it is more than 0.45, it is not preferable in terms of workability due to its weight. Further, those having a bulk specific gravity in the range of 0.34 to 0.38 are more preferable because they have excellent sound insulation performance as a rigid body and sufficient sound absorption performance. It is preferable that the sound absorbing and insulating plate 1 has 30% or more of open cells therein since the sound absorbing performance becomes more excellent.

As shown in FIGS. 1 and 2, a soundproofing method using the sound absorbing and insulating plate 1 is as follows. First, a self-drilling screw 7 is penetrated from the outdoor side of the thin corrugated steel plate 4a to the horizontal body edge 3 to thereby make the angle piece 6 thinner. It is fixed on the steel plate 4a. Thereafter, a 50 mm square steel pipe is fixed to the upright surface of the angle piece 6 as a base steel material 5 by self-drilling screws 7. Finally, the sound absorbing and insulating plate 1 is fixed on the base steel material 5 with the self-drilling screw 7.

A specific soundproofing structure obtained by this soundproofing method is shown in FIGS.
The angle piece 6 is fixed on the thin corrugated steel plate 4a by penetrating a self-drilling screw 7 from the outdoor side of the a to the horizontal trunk 3 and the base steel material 5 of the 50 mm square steel pipe is self-supported on the rising surface of the angle piece 6. The soundproof structure is fixed by drill screws 7 and the sound absorbing and insulating plate 1 is further fixed on the base steel material 5 by self drill screws 7.

The angle piece 6 and the thin corrugated steel plate 4a
Or between the base steel material 5 and the sound-absorbing and sound-absorbing plate 1 to prevent the vibration inside the building from being transmitted and sound to be radiated to the outside.
This is a more preferable embodiment. As the cushioning material 8, natural rubber,
Neoprene rubber, plastic, fiber-based high-density glass wool, high-density rock wool, or an elastic adhesive (for example, a special silicone-modified polymer adhesive or an acrylic resin-based adhesive) is preferable.

In the first embodiment, the base steel material 5 is 50 m
Thin steel plate 4a because m-square steel pipe is used
An air layer 9 having a thickness of 50 mm was able to be provided between the sound absorbing and insulating plate 1. Tables 1 and 2 show the results of measuring the change in noise before and after the sound absorbing and insulating plate 1 was attached at a location 50 cm away from the outer wall of the multi-story parking building. Table 1
Shows results measured before and after construction of the sound absorbing and insulating plate 1 in a state where the multi-story parking lot is operated. Table 2 shows the results of measuring the background noise around the building before and after the installation of the sound absorbing and insulating plate 1 in a state where the multistory parking lot is stopped.

[0015]

[Table 1]

[0016]

[Table 2] As shown in Table 1, after the construction of the sound absorbing and insulating plate 1, the internal noise caused by the operation of the multi-story parking lot was clearly attenuated and transmitted to the outside of the building, and a soundproofing effect to the outside of the building was obtained. In addition, in the case of a noise of 500 Hz or more, especially 20 d
There was a tendency of attenuation over B. As shown in Table 2, after construction of the sound absorbing and insulating plate 1, the background noise around the multistory parking lot was reduced to 500 Hz.
At the maximum. When this rectangular steel pipe is used as the base steel material 5, even if the outer wall 4 of the existing building is the thin corrugated steel sheet 4a, it can be easily fixed to the horizontal waist edge 3 behind the thin corrugated steel sheet 4a and the air layer 9 is provided. Can be. Since the sound absorbing and insulating plate 1 is used as an outer wall, it is preferable to apply or impregnate the surface with a water repellent material from the viewpoint of weather resistance.

[0017]

Embodiment 2 On the outside of the concrete outer wall 4b of the factory,
An example in which the same sound absorbing and insulating plate 1 as in Example 1 is adhered is shown.
As shown in FIG. 4, the joint base metal member 5 a is a long body in which two downwardly extending flared rail-shaped protrusions are continuous at a predetermined interval, and the middle base steel member 5 b is a downward flared opening. It is a cap-type long body which has one rail-shaped convex part of the mold. As shown in FIG. 3, the joint base metal 5a is disposed at a position where both ends of the sound absorbing and insulating plate 1 are carried across the joint, and is fixed on the concrete outer wall 4b using the concrete pin 10. In addition, the intermediate base steel material 5b is disposed at a position where the central portion in the longitudinal direction of the sound absorbing and insulating plate 1 is supported, and is fixed on the concrete outer wall 4b using the concrete pins 10.

Next, the sound absorbing and insulating plate 1 is placed on the base steel materials 5a and 5b.
Is mounted, and self-drilling screws 7 are screwed from both surfaces and intermediate portions of the sound absorbing and insulating plate 1 from its surface to fix the sound absorbing and insulating plate 1 to the base steel materials 5a and 5b. After that, the screw holes formed on the surface are repaired with a repair material. In this way,
The sound absorbing and insulating plate 1 can also be mounted on the concrete outer wall 4b. The method using the base steel materials 5a and 5b is particularly effective because the construction is easy when the outer wall surface is flat.

Further, as shown in FIG. 3, a concrete soundproof structure obtained by this soundproofing method has base steel members 5a, 5b interposed between the sound absorbing and insulating plate 1 and the concrete outer wall 4b, and has a predetermined width. An air layer 9 is formed and the sound absorbing and insulating plate 1 is fixed.

As shown in FIG. 3, the joint base metal 5a
Are disposed at positions on the concrete outer wall 4b where both ends of the sound absorbing and insulating plate 1 are carried across the joint, and are fixed by concrete pins 10. Also,
The intermediate base steel material 5b is disposed at a position on the concrete outer wall 4b where the central portion in the longitudinal direction of the sound absorbing and insulating plate 1 is carried, and is fixed by concrete pins 10. Further, the sound absorbing and insulating plate 1 is made of base steel materials 5a, 5b.
On the surface of the sound absorbing and insulating plate 1 at both ends and at the center by self-drilling screws 7 on the base steel materials 5a and 5a.
b.

By interposing the cushioning material 8 between the concrete outer wall 4b and the base steel material 5a or 5b or between the sound absorbing and insulating plate 1 and the base steel material 5a or 5b, the vibration inside the building is transmitted and the sound is generated. As a result, radiation to the outside is prevented, which is a more preferable embodiment.

The existing building in the present invention refers to a building that has already been constructed. Further, the base steel material 5 is not particularly limited to Example 1 or Example 2,
Shaped steel such as light-weight shaped steel, channel steel, lip channel steel and the like can also be used, and the material may be aluminum, stainless steel or the like in addition to iron in terms of weight reduction or durability improvement.

The porous concrete material constituting the sound absorbing and insulating plate 1 is not particularly limited, but is preferably obtained by the following method. The raw material slurry containing siliceous and calcareous as the main raw material, the raw material slurry and the bubbles are mixed by a preform method of mixing separately formed air bubbles or a mix foam method of foaming the raw material slurry to form air bubbles, or By foaming a foaming material such as aluminum metal powder mixed into the raw material slurry, a semi-cured body in which open cells are formed is produced. A porous concrete material obtained by subjecting the semi-cured body to autoclave curing in a saturated steam atmosphere at 140 ° C. or higher is preferred.

[0024]

According to the present invention, the following effects can be obtained. Since the sound absorbing and insulating plate of the present invention has both sound absorbing performance and sound insulating performance, it is possible to prevent the noise inside the building from the outside of the building and to absorb the noise around the building to reduce the background noise. . At this time, if an air layer is provided between the outer wall of the existing building and the sound absorbing and insulating plate, the sound absorbing and insulating plate absorbs the internal noise of the building further, and the sound leakage to the outside of the building is reduced. Therefore, according to the present invention, when the noise source is inside the building,
Moreover, no soundproofing measures were taken outside the building at the time of building construction, and the building was already built, and there was no room on the indoor side or construction work was poor. In the case of a car park, the effect is particularly exhibited.

The sound-absorbing and sound-absorbing plate of the present invention is embedded in a reinforcing material and has sufficient bending strength, so that it can be used on the upper floors of a middle-to-high-rise building where the wind pressure is large. Since the specific gravity is very small, 0.25 to 0.45, there is no need to perform new reinforcement work on the structural frame of the existing building.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a sound absorbing and insulating plate is attached to a thin corrugated steel sheet in Example 1 of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the sound absorbing and insulating plate is attached to the thin corrugated steel sheet in the first embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a sound absorbing and insulating plate is attached to a concrete outer wall in the second embodiment of the present invention.

FIG. 4 (a) is a perspective view of a joint base steel material used in Embodiment 2 of the present invention.

FIG. 4 (b) is a perspective view of an intermediate base steel material used in Embodiment 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lightweight porous concrete panel 2 Reinforcement material (reinforcing reinforcing bar) 3 Horizontal hull 4 Exterior wall of existing building 4a Thin corrugated steel plate 4b Concrete outer wall 5 Base steel material 5a Base steel material for joints 5b Base steel material for middle part 6 Angle piece 7 Self drill screw 8 cushioning material 9 air layer 10 concrete pin

Claims (7)

[Claims] An underground steel material is disposed outside the exterior wall of an existing building, a reinforcing material is buried, and a bulk specific gravity is 0.2.
A soundproofing method for an existing building, comprising fixing a sound absorbing and insulating plate made of a lightweight porous concrete material of 5 to 0.45 to the base steel material. 2. A sound absorbing and insulating plate made of a porous concrete material having a buried reinforcing material and a bulk specific gravity of 0.25 to 0.45 is fixed to the outside of an outer wall of an existing building via a base steel material. A soundproof structure for existing buildings. 3. The sound absorbing and insulating plate has a thickness of at least 35 mm.
The soundproofing structure for an existing building according to claim 2, wherein the open cells have 30% or more therein. 4. The soundproof structure for an existing building according to claim 2, wherein an air layer of 10 mm to 500 mm is provided between an outer wall of the existing building and the sound absorbing and insulating plate. 5. The soundproof structure for an existing building according to claim 2, wherein the reinforcing material is a plurality of reinforcing bars. 6. The soundproofing structure for an existing building according to claim 2, wherein said base steel material is a square steel pipe. 7. The soundproofing structure for an existing building according to claim 2, wherein the base steel material is a long body having a rail-shaped convex portion having a downwardly-opening flared end.