JP2003176581A - Radio absorbing back board, and glass curtain wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio absorbing back board of a glass curtain wall having high energy saving performance having improved heat insulation performance while keeping radio absorbing performance. <P>SOLUTION: This radio absorbing back board 11 has a heat insulating barrier 10 outside a radio absorbing panel 1 comprising a reflector 7 having an electric conductor for reflecting electromagnetic wave and a radio absorber 3 having a magnetic material for absorbing electromagnetic wave. The glass curtain wall comprises the radio absorbing back board 11 and glass 8 disposed on the heat insulating barrier 10 side, separated by an air layer 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave absorbing backboard which is used for an outer wall of a high-rise building and prevents unnecessary reflected radio waves such as television radio waves (a heat insulating layer is formed outside a radio wave absorbing panel described later). Alternatively, the present invention relates to a radio wave absorption backboard of a glass curtain wall in which most of the outer surface of the outer wall is glass.

[0002]

2. Description of the Related Art The outer wall of a high-rise building reflects TV radio waves, and the reflected radio waves interfere with TV broadcasting, causing a problem of radio interference such as a so-called ghost on the TV screen. As a countermeasure against this, for example, a common antenna is installed in an area where radio interference occurs. However, this method has a problem that the equipment costs a lot and the base station and the cable are destroyed by a natural disaster such as an earthquake. Therefore, a so-called radio wave absorption panel in which an outer wall of a building itself has a radio wave absorption function has been put into practical use. A ferrite plate is mainly used as the electromagnetic wave absorbing material, and various electromagnetic wave absorbing panels in which these magnetic materials are embedded have been proposed.

An example of a conventional radio wave absorption panel will be described with reference to the drawings. Here, in the state where the electromagnetic wave absorption panel is installed in the building, the direction and the like will be described as follows, and the same applies to the description of the electromagnetic wave absorption backboard of the present invention and the glass curtain wall using the same. And (1) The direction or surface on the outside of the building is referred to as “outside”, and the direction or surface on the inside of the building is referred to as “inside”. (2) The vertical direction is referred to as the “magnetic field direction”. (3) A direction orthogonal to the magnetic field direction and also orthogonal to the inner and outer directions (horizontal width direction of the radio wave absorption panel) is referred to as “electric field direction”.

FIG. 5 is a cross-sectional view of a conventional radio wave absorption panel 901, and FIG. 6 is a cross-sectional view of the conventional radio wave absorption panel 901 installed in a building as seen from the side. Absorber layer 5
Is a radio wave absorber 3 and a rib material 4 which is a low dielectric material (GAP part)
Consists of. The outer plate 2 is arranged on the outer side of the absorber layer 5, and the inner plate 6 is arranged on the inner side. A ferrite plate is mainly used as the radio wave absorber 3. As the outer plate 2 or the inner plate 6, for example, a calcium silicate plate is used. A metal reflector 7 is arranged inside the inner plate 6 to form a radio wave absorption panel 901. The inner plate 6 and the outer plate 2 have a fireproof function and also have a function of sandwiching the absorber layer 5 between them. Although the inner plate 6 and the outer plate 2 have some heat insulating performance, they do not satisfy the requirements as a heat insulating material for buildings. And also the members other than the inner plate 6 and the outer plate 2,
It does not meet the requirements as a heat insulating material for buildings. In the absorber layer 5, the electromagnetic wave absorbing material 3 is continuously arranged in the magnetic field direction of the incident electric wave (Y direction in FIG. 5) by matching the surfaces constituted by the width and the thickness, and the electromagnetic wave absorbing material 3 is arranged. It is formed by repeating at a predetermined GAP rate (ratio of the dimension of the rib material 4 to the dimension of the radio wave absorber 3 in the X direction) in the electric field direction (also the X direction) orthogonal to the magnetic field direction. As shown in FIG. 6, the radio wave absorbing panel 901 is installed between the glass 8 for the glass curtain wall of the building and the structural steel 9 of the building that reflects radio waves. With such a configuration, the TV radio waves incident on the outer wall of the building are either absorbed by the absorber layer 5 or reflected by the reflector 7 in a phase opposite to that of the incident radio waves to cancel the incident radio waves and reflect from the outer wall. Is suppressed.

In the glass curtain wall in which the radio wave absorption panel 901 is used, the glass 8 is vertically connected (Y direction) via the aluminum sash 14 as shown in FIG. They were connected in the vertical direction via a radio wave absorption panel support material 15 connected to the aluminum sash 14 (or connected to the ceiling or floor).

[0006]

This radio wave absorption panel 9
In the building to which 01 is attached, as described above, since each member of the radio wave absorption panel 901 does not meet the requirements as the heat insulating material of the building (that is, the heat insulating performance is low), the outside temperature is The temperature of the room inside the building becomes high in the summer or low in the winter. Therefore, there is a problem that energy such as electric power for cooling and heating is used a lot. In order to solve this problem, an internal heat insulation method in which a heat insulating material is arranged inside the radio wave absorption panel 901 has been adopted.

In general, the adiabatic effect is greatly affected by a temperature gradient which is a temperature difference between both sides of a boundary layer (a layer of a boundary between a side to be adiabatic and a side not to be adiabatic). Even if the heat insulation performance of the layer is low, a certain heat insulation effect can be exhibited, but when the temperature gradient is large, the heat insulation effect can hardly be exhibited if the heat insulation performance of the boundary layer is low.
That is, when the temperature gradient between the outside and the inside of the radio wave absorption panel, which is the boundary layer, is small, the inner plate 6 and the outer plate 2 are, as described above.
Although a certain degree of heat insulation performance may have some heat insulation effect, when the temperature gradient is large, almost no heat insulation effect can be exhibited. In other words, keeping the temperature gradient between the outside and inside of the radio wave absorption panel as small as possible
It is advantageous to exert the heat insulating effect of the radio wave absorption panel.

In the above-mentioned inner heat insulation system, the high temperature in summer or the low temperature in winter from the outside air is directly applied to the radio wave absorption panel having low heat insulation performance, and the heat is hardly received from the radio wave absorption panel. Transmitted to the outside of the material,
Substantially only the heat insulating effect of the heat insulating material can be obtained. Further, air conditioning is generally performed in the room inside the building, but in the internal heat insulation method, the heat insulating material is arranged inside the radio wave absorbing panel (that is, the indoor side), and since this heat insulating material also has a large specific heat, Since it is difficult to follow changes in the indoor temperature due to cooling and heating (a decrease in the indoor temperature due to cooling or an increase in the indoor temperature due to heating), the effect of cooling and heating is suppressed, and energy saving performance is reduced.

Therefore, an object of the present invention is to provide a radio wave absorption backboard of a glass curtain wall having an improved heat insulation performance and an excellent energy saving performance while maintaining the radio wave absorption performance, and a glass curtain wall using the same. is there.

[0010]

As a result of various researches, the present inventors have completed the present invention by solving the above-mentioned problems by using the following electromagnetic wave absorption backboard and a glass curtain wall using the same. Came to do. The invention of claim 1 is a radio wave absorption backboard, characterized in that a heat insulating layer is provided outside the radio wave absorption panel.

A second aspect of the present invention is a glass curtain wall comprising a radio wave absorbing backboard having a heat insulating layer on the outside of the radio wave absorbing panel and glass.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross-sectional view of a radio wave absorption backboard and a glass curtain wall using the same according to the first embodiment of the present invention. 2 is a sectional view taken along line XX of FIG. The same parts are designated by the same reference numerals as those in FIG. 5 or FIG. Hereinafter, Embodiment 1 will be described with reference to the drawings.

Electric field direction dimension (width) 1016 mm × Magnetic field direction dimension (length) 1300 mm × Inward / outward direction dimension (thickness) 2
A frame 16 made of a resin square bar having an electric field direction dimension or a magnetic field direction dimension 20 × inside / outside dimension (thickness) 6.5 mm outside the four sides of the reflector 7 which is an aluminum plate (conductor for reflecting electromagnetic waves) of mm. To form a box-shaped metal case. The bottom of this box-shaped metal case (outside of the reflector 7)
An inner plate 6 which is a calcium silicate plate having a specific gravity of 0.7 or less and having an inner-outer dimension (thickness) of 10 mm and which is formed so as to be surrounded by the frame 16 and is fixed with an epoxy adhesive. . Next, the absorber layer 5 is formed on the outer side of the inner plate 6. The absorber layer 5 has a dimension (width) of 25 mm in the electric field direction, a dimension (length) of 200 mm in the magnetic field direction, and a dimension (thickness) in the inner and outer directions.
A ferrite plate, which is a magnetic material that absorbs electromagnetic waves of 6.5 mm, is arranged so that the gap ratio in the electric field direction is approximately 35% and continuous in the magnetic field direction. The rib material 4 is made of urethane foam having a width of 13.5 mm × internal / outward dimension (thickness) of 6.5 mm and a dielectric constant of 1.3. When the radio wave absorber 3 is a ferrite plate, the width (in the direction of the electric field, that is, the left-right direction on the paper surface of the drawing) of the ferrite plate is A, and the thickness (inward and outward directions, that is, the direction orthogonal to the paper surface of the drawing) is B. , A ≧ B, which is the same in the other embodiments described below.
Next, an outer plate 2, which is a calcium silicate plate having the same size as the inner plate 6 and a specific gravity of 0.7 or less, is fixed to the outer side of the absorber layer 5 with an epoxy adhesive, and a radio wave absorption panel 1 having a thickness of 28.5 mm is obtained. Was produced. The thermal conductivity of the inner plate 6 and the outer plate 2 which are the calcium silicate plates is 0.1 kcal / m · h · ° C.
Although it has some heat insulating performance, it does not meet the requirements as a heat insulating material for buildings.

Further, a heat insulating layer 10 was formed on the outside of the outer plate 2 to obtain a radio wave absorbing backboard 11. The heat insulation layer 10
The material is, for example, blown foam beads, and its inner and outer dimensions (thickness) and thermal conductivity are preferably 15-4.
0 mm and 0.05 kcal / m · h · ° C, and more preferably 20 to 35 mm and 0.03 kcal / m · h · ° C. Thickness is less than 15mm and / or thermal conductivity is 0.05kcal / m
・ If h ・ ° C is exceeded, the heat insulation effect will be insufficient. Normally, the heat insulating layer 10 is provided on the entire outer surface of the outer plate 2, but it does not necessarily have to be provided on the entire surface and may not be provided on a part of the surface.

Further, the glass 8 is disposed on the outside of the heat insulating layer 10 with an air layer 12 having a dimension (thickness) of 100 mm in the inner and outer directions, and a glass curtain wall 13 is formed.
As a fixing means of the glass 8 to the radio wave absorption backboard 11, a method of attaching through a window component such as a gasket sash is generally used, but the method is not limited to this, and any other fixing means can be adopted. .

The glass curtain wall 13 is installed on the outside of the building, and the television radio wave incident on the outer wall of the building is absorbed by the absorber layer 5 or reflected by the reflector 7 in the opposite phase to the incident radio wave. It cancels the incident radio waves and suppresses the reflection from the outer wall.

As described above, the electromagnetic wave absorption backboard 11 of the present invention and the glass curtain wall 13 using the same.
In the above, since the outer heat insulation system is formed by forming the heat insulation layer 10 having high heat insulation performance on the outside of the outer plate 2 having low heat insulation performance, the high temperature in summer or the low temperature in winter from the outside air causes the heat insulation layer 10 having high heat insulation performance. In addition, the temperature is relaxed close to room temperature (high temperature in summer is lowered to near room temperature, or low temperature in winter is raised to near room temperature). For this reason, even if the outer plate 2 and the inner plate 6 having low heat insulating performance are boundary layers, the temperature gradient on both sides of the boundary layer is small, and therefore the outer plate 2 and the inner plate 6 having low heat insulating performance also exhibit the heat insulating effect. can do. Further, the low heat insulation performance means that the specific heat is small, and the heat insulation performance is low, that is, the specific heat is small.
Are disposed inside the heat insulating layer 10 (that is, the inside of the room), the outer plate 2 is protected against changes in the room temperature due to cooling and heating (a decrease in the room temperature due to cooling or an increase in the room temperature due to heating). It is easy to follow and the effect of air conditioning is exhibited.
Therefore, in the radio wave absorption backboard 11 and the glass curtain wall 13 using the same according to the present invention, a synergistic heat insulating effect can be obtained by the heat insulating layer 10, the outer plate 2, and the inner plate 6, and accordingly, the heat insulating effect of the whole is increased. It is possible to provide a radio wave absorption backboard of a glass curtain wall that exhibits excellent air-conditioning and heating effects and excellent energy saving performance, and a glass curtain wall using the same.

FIG. 3 shows a cross-sectional view of a radio wave absorption backboard according to Embodiment 2 of the present invention and a glass curtain wall using the same. The same parts are designated by the same reference numerals as those in FIG. The second embodiment will be described below with reference to this drawing.

The glass curtain wall 213 is vertically symmetrical with respect to a center line (not shown) in the vertical direction of the paper surface of FIG. A wave absorber panel 3 including an absorber layer 5 including an electromagnetic wave absorber 3 and a rib material 4 that is a low dielectric material (GAP part), an outer plate 2 and an inner plate 6, and an outer plate of the electromagnetic wave absorber panel 1. The electromagnetic wave absorption backboard 11 formed by disposing the heat insulating layer 10 on the outer surface of the second electrode is the same as that of the first embodiment. The radio wave absorption backboard 11 includes a reflector 27 (reflector that is a conductor that reflects electromagnetic waves) that is a reflection reinforcing bar (a conductor that reflects electromagnetic waves) and (if necessary) a structural rebar (not shown in FIG. 3). It is disposed in the concave portion 54a on the outer surface of the concrete-made precast plate 54 in which the () is included. Reflector 2
7 is arranged in the direction of the electric field, and in this embodiment, the reflector 27 has a diameter of 20 mm and a pitch of 200 mm in the magnetic field direction. Further, the glass 8 is disposed on the outer side of the heat insulating layer 10 via the air layer 12 similar to that of the first embodiment, and the upper and lower end portions of the precast plate 54 are protruded outwardly.
An exterior material 51 is arranged on 4b.

In this way, the precast plate 54 is
A glass curtain wall 21 in which the radio wave absorbing backboard 11, the glass 8 and the exterior material 51 are arranged and integrated.
3 are configured. The dimensions of the precast plate 54 and the exterior material 51 are appropriately set so that the surfaces of the upper and lower exterior materials 51 are aligned (the protrusions on the right side of the drawing are the same). As the exterior material 51, for example, a building tile is used, but the exterior material is not limited to this and various materials can be used. As a fixing means of the exterior material 51 to the precast plate 54, a fixing member (not shown) is generally fixed, but the fixing means is not limited to this and any other fixing means can be adopted.

The glass curtain wall 13 of the first embodiment
Since the glass 8 and the electromagnetic wave absorption backboard 11 were separately made and attached (connected) via a window component such as a gasket sash at the construction site, assembly work at the construction site is required. On the other hand, in the glass curtain wall of the present embodiment, as described above, the electromagnetic wave absorption backboard 11, the exterior material 51, and the glass 8 are fixedly integrated with the precast plate 54, so that the assembly work at the construction site is easy. The number is smaller than that of the glass curtain wall 13 of the first embodiment. Further, the precast plate 54 made of concrete enhances the sound insulation effect. The other actions and effects are similar to those of the first embodiment.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
FIG. The same parts are designated by the same reference numerals as in FIG.

The radio wave absorbing panel 313 is vertically symmetrical with respect to a center line (not shown) in the vertical direction of the paper surface of FIG. The absorber layer 35 includes a radio wave absorber 33 and a rib member 34 that is a low dielectric (GAP portion). The electromagnetic wave absorption panel 3 in which the outer plate 32 is arranged outside the absorber layer 35 and the inner plate 36 is arranged inside the absorber layer 35.
1 is formed. The material and configuration of the radio wave absorption panel 31 are the same as those of the radio wave absorption panel 1 of the second embodiment. Further, foam beads are sprayed on the outside of the outer plate 32, and the second embodiment
A heat insulating layer 310 similar to the above heat insulating layer was formed to obtain a radio wave absorption backboard 311. A reflector 27 (a conductor that reflects electromagnetic waves) that is a reflective rebar (a conductor that reflects electromagnetic waves) and (if necessary) a structural rebar (not shown in FIG. 4) made of concrete. Precast board 3
Reference numeral 54 includes two concave portions 354a on the outer surface, convex portions 354b at both upper and lower end portions, and a convex portion 354c at an intermediate portion.
The radio wave absorption panel 31 is disposed in the two recesses 354a. A heat insulating layer 310 is provided outside the outer plate 32. Normally, the heat insulating layer 310 is provided on the entire outer surface of the outer plate 32, but it does not necessarily have to be provided on the entire surface and may not be provided on a part of the surface. Further, the glass 38 is arranged on the outer side of the glass 38 via the air layer 312. The exterior material 51 is disposed on the protrusions 354b at both ends. On the convex portion 354c of the middle portion, the second electromagnetic wave absorber 332 which is the second electromagnetic wave absorber and the second electromagnetic wave absorber (GAP part)
The second absorber layer 352 made of the rib material 342 is disposed, and the second exterior material 512 is disposed outside the second absorber layer 352. The precast plate 354, the electromagnetic wave absorption panels 31, 502, the exterior materials 51, 5 so that the surfaces of the exterior material 51 and the exterior material 512 are aligned (the protrusion on the right side of the drawing is the same).
Twelve dimensions are set appropriately. The exterior materials 51 and 512
The material is the same as that of the exterior material 51 of the second embodiment. The material and structure of the absorber layer 352 are the same as those of the radio wave absorption panel 31. The size of the reflector 27 and the pitch in the magnetic field direction are the same as those of the reflector 27 of the second embodiment.

In this way, the radio wave absorption panel 31, the heat insulating layer 310, the absorber layer 352, the precast plate 354,
A glass curtain wall 313 is configured in which the exterior material 51, the exterior material 512, and the glass 38 are arranged and integrated. The fixing means when manufacturing the radio wave absorption panel 31 is the same as that of the radio wave absorption panel 1 of the second embodiment. The means for fixing the radio wave absorption panel 31, the exterior material 51 or the glass 38 to the precast plate 354 is the same as the means for fixing the radio wave absorption panel 1 exterior material 51 or the glass 8 to the precast plate 54 in the second embodiment. The method of providing the heat insulating layer 310 on the outer side of the outer plate 32 is the same as the outer plate 2 in the second embodiment.
This is the same as the method of providing the heat insulating layer 10 on the outer side of. The effect of the heat insulating layer 310 is similar to that of the heat insulating layer 10 of the second embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. The dimensions, shapes, materials, fixing means, etc. described in the embodiments are not limited to these, and may be optimized in consideration of functions, productivity and the like. For example, it goes without saying that the cross-sectional shape described in the embodiments can be various shapes suitable as a building member.

The following modifications are also possible. (1) The frame 16 of the first embodiment is provided as necessary for reinforcing the strength or positioning the inner plate 6,
If it is not necessary, it may not be provided. (2) Although the aluminum plate is used as the reflector 7 in the first embodiment, the present invention is not limited to this, and an arbitrary conductive material such as an iron plate can be used. Further, it is not necessary to have a plate shape, and for example, reinforcing bars may be arranged in the electric field direction. In the second and third embodiments, the reflective rebar is used as the reflector 27, but the present invention is not limited to this, and any conductive material such as an iron plate can be used. Further, it is not necessary to have a rod shape, and for example, a conductive net may be provided. (3) In the embodiment, the ferrite plate is used as the electromagnetic wave absorbing material, but the invention is not limited to this, and the electromagnetic wave absorbing function Any material may be used as long as it has, for example, resin or rubber containing magnetic powder may be used. (4) In Embodiment 2 or Embodiment 3, the glass curtain wall is vertically symmetrical, but it may be vertically asymmetrical. (5) In the second or third embodiment, the exterior material 51 is disposed on the outward convex portions of the upper and lower end portions of the precast plate, but at least the outward convex portions of the upper and lower end portions of the precast plate are provided. A part of the precast plate may be exposed without arranging the exterior material 51 (a surface treatment such as painting or coating is performed if necessary). Further, it is not necessary that the upward and downward sizes of the convex portions outward of the upper and lower end portions of the precast plate are the same. (6) In the embodiment, the foam beads are blown to the outside of the outer plate to form the heat insulating layer, but the method of forming the heat insulating layer is not limited to this, and another material having excellent heat insulating properties is used. However, the construction of these materials is not limited to the above-mentioned spraying, and various methods such as preliminarily manufacturing and attaching a plate-shaped material are possible, and a material having excellent heat insulation is provided on the outside of the outer plate. Any method of doing can be adopted.

In the present invention, the combination of the above modifications or the combination of the embodiment and the modifications can be arbitrarily performed.

As described above, according to the present invention, there is provided a radio wave absorption backboard of a glass curtain wall having an improved heat insulation performance and an excellent energy saving performance while maintaining the radio wave absorption performance, and a glass curtain wall using the same. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a glass curtain wall using a radio wave absorption backboard that is Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of a glass curtain wall using a radio wave absorption backboard according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a glass curtain wall using a radio wave absorption backboard according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional radio wave absorption panel.

FIG. 6 is a cross-sectional view of a state in which a conventional electromagnetic wave absorption panel is installed in a building as seen from the side.

[Explanation of symbols]

1,31 Radio wave absorption panel 2,32 skin 3, 33, 332 electromagnetic wave absorber 4, 34, 342 rib material 5, 35, 352 Absorber layer 6,36 inner plate 7,27 reflector 8,38 glass 10,310 Thermal insulation layer 11, 311 radio wave absorption backboard 12, 312 Air layer 13,313 glass curtain wall 14 Aluminum sash 15 Radio wave absorption panel support material 16 frames 51, 512 Exterior material 54,354 Precast board 54a, 354a recess 54b, 354b, 354c Convex part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiyuki Moriyama             2977 Tahira, Yoshii-cho, Tano-gun, Gunma Prefecture Hitachi Kin             Within Genki Kiko Co., Ltd. F term (reference) 2E001 DH01 FA04 GA48 HA11 HA20                 2E002 NA04 NB02 NB05 WA00                 5E321 AA44 BB22 BB51 GG11 GH01                       GH10                 5J020 AA03 BA06 BD02 EA02 EA10

Claims (2)

[Claims] 1. A radio wave absorbing backboard comprising a heat insulating layer on the outside of the radio wave absorbing panel. 2. A glass curtain wall comprising a radio wave absorbing backboard having a heat insulating layer on the outside of the radio wave absorbing panel and glass.