JPH09307276A - Buildings that reduce noise radio waves - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To effectively use general building materials as a measure for immunity to reduce noise radio waves by simple construction and prevent interference and malfunction of electronic devices in a building. SOLUTION: A noise radio wave reduction-compatible building that prevents interference and malfunction of an internal electronic device due to noise radio waves from the outside and creates a favorable radio wave environment of an internal wireless system, and has a high performance that has a metal film on the outer wall. The heat ray reflective glass 1 is used and fitted into the sash frame to use the metal film as an electromagnetic shielding film for reducing noise radio waves. Further, the high performance heat ray reflective glass 1 is combined with the aluminum spandrel 2 as the outer peripheral wall portion to form a horizontal window, which has a noise electric wave reducing characteristic, thereby preventing interference and malfunction of the internal electronic device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building for reducing noise radio waves which prevents interference and malfunction of internal electronic devices due to noise radio waves from the outside.

[0002]

2. Description of the Related Art When a radio communication system using radio waves is adopted in a building, regulations of the Radio Law regarding the frequency band to be used pose a problem. Therefore, in order to freely select and set the frequency band to use and adopt a unique wireless communication method without being restricted by the Radio Law, the space inside the building was electromagnetically shielded from the outside. Construction of an electromagnetic shielding building is indispensable. The applicant has already disclosed such an electromagnetic shielding building in, for example, Japanese Patent Publication No. 6-99972, Japanese Patent Publication No. 6-99973, Japanese Patent Publication No. 7-16118, and Japanese Patent Publication No. 6-76706. And Japanese Patent Publication Nos. 6-33971 and 6-33699, and 6-1382.
Japanese Patent Publication No. 6-63407 and Japanese Patent Publication No. 5-79790 disclose a structure for shielding a doorway of a building.
Japanese Patent Publication No. 3-55857 discloses a structure for shielding a window opening. In addition, Japanese Patent Publication No. 3-62320, Japanese Patent Publication No. 3-45772, and Japanese Patent Publication No. 3-6231.
No. 8 and Japanese Patent Publication No. 5-34159 propose a shielding structure for ceilings and layers.

[0003] As described above, an electromagnetic shielding building uses an electromagnetic shielding material for a frame or a wall structure, and further uses an electromagnetic shielding material for windows, entrances, and other openings along the outer wall of the building. By covering with an electromagnetic shielding material, the space in the building can be configured as one electromagnetic shielding space independent from the outside. In addition, the interior of the building is not limited to one electromagnetic shielding space, but each floor is separated by an electromagnetic shielding material on the upper and lower ceilings and floors, or by partitioning walls between rooms on each floor with an electromagnetic shielding material. Alternatively, a plurality of independent electromagnetic shielding spaces can be formed for each room.

[0004]

However, buildings that require electromagnetic shielding do not all require a uniform and constant level of shielding.
The shielding level required in accordance with the environment around the building is actually various, and the specifications to be constructed differ depending on the shielding level. For example, in a building with a computer system, a high shielding level is required to prevent computer data from being destroyed or leaked to the outside due to the invasion of external radio waves, that is, to prevent leakage of confidential data. . In such a case, a high shielding level is required for each of the electromagnetic shielding layers, and confidentiality as a radio wave use space is required so that no gap is formed in a joint portion of the electromagnetic shielding layers.

On the other hand, since various electronic devices have come to be used also in general buildings, malfunctions and interference due to various noise radio waves from the surroundings are often a problem for these electronic devices. For example, there are noise radio waves generated from illegal high-power truck radio (CB radio) along arterial roads, noise radio waves generated from production equipment at nearby factories, and noise radio waves generated from train pantographs along railway tracks. Yes, there are generally broadcast waves of television and radio. These noise radio waves may cause malfunctions of information devices such as general-purpose computers and personal computers, malfunctions of smoke detectors and intercoms, malfunctions of crime prevention systems,
This may cause interference with wireless communication devices. When these malfunctions are caused at midnight, for example, in the remote security system, the guards are given unnecessary mobilization commands each time and are tossed, and the sleep in the dwelling unit is disturbed and the quiet life is violated. Occurs.

In the former measures such as computer systems,
Since near perfect shielding level is required, it is generally 30dB by adopting high quality electromagnetic shielding material and construction.
Achieving a degree of shielding is needed.
Therefore, when each of the above proposals is adopted, a high construction cost of about 3 to 5% of the construction cost is required. But,
The latter countermeasure (immunity) for malfunctions and interference of electronic devices and the like can be achieved by reducing radio noise to an allowable level of electronic devices and the like. For example, the maximum level of the above-mentioned noise radio waves expected in the surroundings is about 140 dB at the generation source, but when the distance attenuation is considered, it becomes about 110 to 120 dB on the wall surface of the building. On the other hand, the allowable level for radio noise from electronic devices is
General-purpose computer 110-120 dB, personal computer 1
Although it is about 30 dB, in reality, a malfunction whose cause is unknown may occur. Of course, these numbers are
Although it varies with the times, considering these relationships, problems such as malfunction and interference can be solved if the shielding level is at most about 10 to 15 dB. Therefore, if all the high-level construction based on each of the above proposals is attempted to achieve the same shielding level as the former, the construction cost will be very high, and the efficiency will be significantly reduced in terms of cost effectiveness. Deteriorate.

[0007]

Means for Solving the Problems The present invention is to solve the above problems, and effectively uses general building materials as a measure for immunity to reduce noise radio waves by simple construction, and It is intended to prevent interference and malfunction of the electronic device. Therefore, the present invention is a noise radio wave reduction-compatible building that prevents interference and malfunction of internal electronic devices due to noise radio waves from the outside and creates a favorable radio wave environment of the internal wireless system, and a metal film on the outer wall. It is characterized by using a high-performance heat-reflecting glass with a metal film that is fitted into a sash frame and used as an electromagnetic shielding film to reduce noise radio waves. Combined with a spandrel to form a horizontal window, or an electromagnetic shielding sheet is laid on the setting block to fit the high-performance heat-reflecting glass into the sash frame, and a non-woven fabric made of an electromagnetic shielding material is used as the electromagnetic shielding sheet for high performance. A backup material using an electromagnetic shielding material is arranged between the surface of the heat ray reflective glass having the metal film and the sash frame. Than it is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an embodiment of a building for reducing noise radio waves according to the present invention. In the figure, 1 is a high-performance heat ray reflective glass, 2 is an aluminum spandrel, 3 is an entire glass curtain wall, 4 is an entrance, and 5 is an entire aluminum spandrel.

The building capable of reducing noise radio waves according to the present invention can prevent interference or malfunction due to noise radio waves from the outside in wireless communication devices and electronic devices in the building.
The level of noise radio waves is reduced by effectively combining and using building materials that have a certain level of electromagnetic shielding performance and will be described with reference to a building configuration example shown in FIG.

In FIG. 1A, as the outer peripheral wall portion,
The front and right side walls are made up of horizontal window made of high performance heat ray reflective glass 1 and aluminum spandrel 2, and the left side wall is made of high performance heat ray reflective glass as shown in FIG. 1 (B). The entire surface of the glass curtain wall 3 is used, and the rear wall portion is composed of the entire surface of the aluminum spandrel 5. The high-performance heat ray reflective glass has a thin metal film (metal film coating) formed by vacuum-depositing a metal by sputtering. The glass metal film is about 1/5 (about 15 dB) against noise radio waves. It is used as a shielding film for noise radio waves having a characteristic of attenuating the noise. High-performance heat-reflective glass shields noise radio waves in such a way that the visible light transmittance changes depending on the film thickness and the mixing ratio of the material, and generally the visible light transmittance decreases as the film thickness increases. Since the characteristics are improved, the film thickness and the material mixing ratio are selected in consideration of the required shielding characteristics, building lighting, external heat (air conditioning efficiency), design aspects, and the like. In addition, since the space between adjacent buildings is particularly small, if there is little light from the window and there is no problem in terms of design, use high-performance heat ray reflective glass or aluminum spandrel instead of meshed glass as the outer wall. You may use.

As described above, the outer peripheral wall portion is made of the high-performance heat ray reflective glass 1, the aluminum spandrel 2, the whole surface glass curtain wall 3, the whole surface aluminum spandrel 5, the netted glass, etc., and penetrates through the wall portion. Noise radio waves can be attenuated, and malfunctions of smoke detectors, intercoms, and the like due to noise radio waves, malfunctions of other electronic devices, and radio communication equipment interference can be prevented. On the other hand, on the rooftop floor and the floor on the lowest floor, an electromagnetic shielding layer composed of a metal mesh, a metal foil (fiber), a fiber using an electromagnetic shielding material, a sheet, a non-woven fabric, or the like is arranged.

When an attempt is made not only to reduce noise radio waves from the outside to prevent malfunction but also to prevent radio wave interference on the upper and lower floors to establish a communication cell for each floor, if there is a void, Even if the radio wave is blocked on the floor, the radio wave interference cannot be prevented due to the void. Therefore, if there is a blow-through, it is necessary to shield the wall even if the blow-through is inside. Also, for floors on each floor, some shielding level can be achieved depending on the concrete thickness of the floor slab. Therefore, the radio waves used for internal communication can be used with a relatively low output, and the desired shielding level required for the upper and lower floors can be achieved depending on the thickness and structure of the concrete of the floor slab. However, for example, in a building with a relatively small floor area, the output of communication radio waves inside can be reduced, but when the floor area becomes large and the communication area on one floor becomes large, the output of communication radio waves also increases. Conceivable. In such a case, in order to prevent radio wave interference on the upper and lower floors, it may be sufficient depending on the thickness and structure of the concrete of the floor slab, or a special electromagnetic shielding layer may be required. Therefore, in the case where sufficient attenuation of radio waves cannot be achieved with the concrete slab alone on the upper and lower floors, in order to prevent radio wave interference of the wireless communication equipment on the upper and lower floors in the building and to make full use of the available channels, A metal structural material / formwork such as a metal deck plate (F deck plate) is used.

FIG. 2 is a diagram for explaining the relationship between the noise level and the shielding level. The noise radio waves generated from illegal high-power truck radios (CB radios), noise radio waves generated from production equipment of neighboring factories, and noise radio waves generated from pantographs of trains are At the source, it is about 140 dB at the highest. On the other hand, the permissible level of general-purpose computers, personal computers, and other electronic devices is about 110 dB to 130, and considering the distance attenuation of about 20 to 30 dB from the source of noise radio waves, the attenuation level is almost close to the permissible level. But,
In rare cases, malfunction or interference occurs. In this way, since noise radio waves are attenuated to near the allowable level, the shielding level that attenuates noise radio waves to about ⅕ as shown in FIG. 2 and the shielding performance required to prevent malfunction and interference even at about 15 dB. Can be fully achieved. Therefore, even if it is not an electromagnetic shielding glass (shielding level is about 30 dB) on which a metal mesh or film is specially attached or a metal film is formed, the shielding level is 15 dB depending on the film thickness and the mixing ratio of materials as described above. It can be selected from high-performance heat ray reflective glass. Further, in general, in the case of meshed glass, it is 1/20 or less of the wavelength of the radio wave to be shielded, and 5 at frequencies up to 3 GHz.
Although it is set to mm × 5 mm or less, this is based on the premise that the shielding level is about 30 dB. However, it achieves a shielding level of about 15 dB, which is half of that, that is,
If the level of noise radio waves is attenuated to about 1/5, if the same frequency is targeted, 10 mm x 10 mm
The following may be used. Needless to say, aluminum spandrels, steel panels, metal deck plates, etc. can achieve shielding levels higher than these. In order to prevent interference and malfunction of the internal electronic device due to noise radio waves from the outside in this way, and at the same time to create a good radio environment for the internal radio system that does not interfere with each other on the upper and lower floors, As shown in the form, it can be achieved by selecting from the conventionally used building materials and combining them according to the ambient noise radio environment, etc., and adding detailed work as necessary.

Next, a concrete construction example of the wall and floor will be described. FIG. 3 is a diagram showing a construction example of the glass attachment portion, FIG.
FIG. 5 is a diagram showing an example of using a base material in a connecting portion of a metal plate, and FIG. 5 is a diagram showing an example of a floor structure of each floor using a metal structural material / formwork. In the figure, 1-2 is a metal film, 1-3 is a sash frame, 1-4 is a sealing material, 1-5 and 1-6 are backup materials, 1-7 is a setting block, 1-8 is an electromagnetic shielding sheet, 11 is a cement plate, 12 is a metal plate,
13 is a C-shaped channel plate, 14 is an aluminum spandrel, 15 is a modified C-shaped channel plate, 16 is a metal panel, 17 is floor slab concrete, and 18 is a metal structural material / form.

As shown in FIG. 3 (A), the mounting portion of the high-performance heat-reflecting glass is set with the setting block 1-7 and the high-performance heat-reflecting glass 1 on the sash frame 1-3, and the backup material 1-5, Fix with 1-6 and sealing material 1-4. In this case, an electromagnetic shielding material is used as the backup material 1-6 on the side where the metal film 1-2 is present so that the space between the sash frame 1-3 and the metal film 1-2 is closed.
Also, as shown in FIG. 3B, the setting block 1
The high-performance heat ray reflective glass 1 may be set by laying an electromagnetic shielding sheet 1-8 on -7 and fixing it with a backup material 1-5 and a sealing material 1-4. Electromagnetic shielding sheet 1
As -8, for example, a non-woven fabric using an electromagnetic shielding material, a metal foil, a tape or the like can be used. Of course, as mentioned above, depending on the surrounding environment, the high performance heat ray reflective glass 1
When the noise radio wave can be reduced to an allowable level by the conventional construction using the above, the construction using the backup material 1-6 or the electromagnetic shielding sheet 1-8 using such an electromagnetic shielding material is unnecessary.

A connecting portion of an outer peripheral wall portion using an aluminum spandrel, a metal panel, or another metal plate is, for example, as shown in FIG.
As shown in (A), a metal plate (aluminum plate) 12 and a C-type channel plate 13 are used as a base material on the cement plate 11. As a result, since the metal plate absorbs expansion and contraction due to temperature change, even if a connection interval is provided, it is possible to prevent the deterioration of the shielding performance by covering the space with the metal plate 12. When the metal panel 16 is used as shown in FIG. 4 (B), the metal panel 16 may be connected via a special metal fitting such as the modified C-type channel plate 15. By constructing such a connecting portion, even if a space is provided in the joint between the aluminum spandrel 14 and the metal panel 16 in consideration of expansion and contraction due to temperature change, the gap is not affected by the metal plate 12 or deformation. Since it is blocked with the base material such as the C-type channel plate 15,
It is possible to prevent direct intrusion of noise radio waves and to attenuate noise radio waves to some extent. As the base material, C made of conductive steel, aluminum or stainless steel
Mold channels, plates, etc. are used.

Further, in the floor structure of each floor, when the sufficient attenuation level (shielding level) of the radio wave cannot be achieved only by the concrete slab, the metal deck plate (F) is attached to the floor structure of each floor as shown in FIG. A metal structural material / form 18 such as a deck plate is used, and a floor slab concrete 17 is cast thereon. In this case, a gap is formed between the metal structural material / formwork 18 as the electromagnetic shielding layer and the aluminum spandrel 14 of the wall portion, but since it is the end portion,
For the radio waves used for internal communication, the metal structural material and formwork 1
Sufficient damping characteristics can be achieved only by using 8. This is a recent wireless system (PH
S, wireless LAN, etc.) are becoming lower in output. Of course, as described above, if a sufficient level of characteristics cannot be obtained, it is possible to appropriately select and employ the connection construction between the shield layers for the abutting portion as already proposed. There is no end.

FIG. 6 is a diagram showing an example of an indoor electromagnetic environment model of a building compatible with noise radio wave reduction according to the present invention, in which a high-performance heat ray reflecting glass 21 and an aluminum spandrel 2 are provided on the outer wall.
No. 2 is used, the glass 23 with a net is used for the wall of the stairwell, the steel panel 24 is used for the wall of the partition, and the ceiling and floor are electromagnetic shield materials 25, 26 by deck plates.
It is configured using. By effectively using ordinary building materials for the eight surfaces of the indoor space in this way, noise radio waves from the outside can be attenuated by at least about ⅕, 15 dB, although the high shielding level cannot be achieved. Therefore, malfunctions due to noise radio waves of electronic devices such as fire alarms, smoke detectors, general-purpose computers, personal computers, etc., which have rarely occurred in the past, and radio wave interference in the upper and lower floors of the indoor wireless communication system can be greatly reduced.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-mentioned embodiment, the front surface is constituted by the horizontal window made of high-performance heat ray reflective glass and aluminum spandrel, but it may be a curtain wall of high-performance heat ray reflective glass over the entire surface, or each outer peripheral wall portion, You may employ | adopt the structure by which the glass which has a metal film, a metal panel, and a netted glass is variously combined. Further, the concretely shown numerical values are exemplified as general numerical values, and the level of noise radio waves, the permissible level, the shielding level, and the like change depending on the environment.

[0020]

As is apparent from the above description, according to the present invention, a high-performance heat-reflecting glass having a metal film on the outer peripheral wall is used, and the metal film is fitted into the sash frame to reduce the electromagnetic noise. Since it is used as a film, it is possible to reduce external radio noise, prevent malfunctions and interference of electronic devices in the room, and effectively use the wireless system in the room. Moreover, since it is possible to prevent malfunctions and interference of electronic devices in the room by selecting from high-performance heat-reflecting glass and building materials that have been conventionally used, it is possible to suppress construction costs and construction costs, and smoke detectors. It is possible to prevent malfunction of an intercom or the like.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of a building for noise radio wave reduction according to the present invention.

FIG. 2 is a diagram for explaining a relationship between a noise level and a shielding level.

FIG. 3 is a diagram showing an example of construction of a glass attachment part.

FIG. 4 is a diagram showing an example of using a base material in a connecting portion of a metal plate.

FIG. 5 is a diagram showing an example of a floor structure of each floor using a metal structural material and formwork.

FIG. 6 is a diagram showing an example of an indoor electromagnetic environment model of a building capable of reducing noise radio waves according to the present invention.

[Explanation of symbols]

1 ... High performance heat ray reflective glass, 2 ... Aluminum spandrel,
3 ... Full glass curtain wall, 4 ... Entrance,
5 ... Full surface aluminum spandrel

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuyuki Asai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (5)

[Claims] 1. A building for reducing noise radio waves, which prevents interference and malfunction of internal electronic devices due to noise radio waves from the outside and creates a good radio environment for the internal wireless system,
A noise radio wave reduction compatible building characterized by using a high performance heat ray reflective glass having a metal film on the outer peripheral wall and fitting it into a sash frame to use the metal film as an electromagnetic shielding film for reducing noise radio waves. 2. The building for noise noise reduction according to claim 1, wherein a high performance heat ray reflective glass is combined with an aluminum spandrel as a peripheral wall to form a horizontal window. 3. The noise electromagnetic wave reduction-compatible building according to claim 1, wherein an electromagnetic shielding sheet is laid on the setting block and high performance heat ray reflective glass is fitted in the sash frame. 4. The building for noise noise reduction according to claim 1, wherein a nonwoven fabric made of an electromagnetic shielding material is used as the electromagnetic shielding sheet. 5. The noise radio wave reduction corresponding building according to claim 1, wherein a backup material using an electromagnetic shielding material is arranged between the surface of the high-performance heat ray reflective glass having the metal film and the sash frame.