JP3158961B2 - Wall structure to reduce radio interference - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall structure for reducing a radio interference which can reduce a reception impairment of a television broadcast or the like caused by a broadcast radio wave reflected on an outer wall of a building.

[0002]

2. Description of the Related Art Conventionally, a radio wave absorbing wall disclosed in Japanese Patent Publication No. 1-45238, for example, has been known as a wall of a building capable of reducing a reception obstacle such as a television broadcast caused by a reflected radio wave.

In this radio wave absorbing wall, a pair of leg pieces is projected from the back of a decorative block made of a material that transmits radio waves, and a ferrite-based molded body that absorbs radio waves is fitted between the adjacent leg pieces. And a decorative mesh to which the ferrite-based molded body is fixed is arranged in parallel, and a reinforcing bar mesh that also functions as a reinforcing bar and a reflector is disposed between the tip surfaces of the legs of each block. Concrete is cast on the back surface of the block to form a precast concrete plate, and is used as an outer wall of a building frame.

According to such a radio wave absorbing wall,
When the arriving radio wave is reflected by the reflector, it is transmitted and absorbed twice through the ferrite molding before and after the reflection, so that the intensity of the reflected wave can be weakened. The range of reception disturbance caused by waves may be reduced.

[0005]

However, in the above-mentioned conventional wall structure, when the curtain wall is vertically mounted on the outer wall of the building frame, the reflector buried inside the wall is also vertical, so that the reflector is usually located higher than the building concerned. The reflected wave of the broadcast wave arriving from the transmitting antenna provided at the main beam is directed downward, making it easier to reach the surface of the neighboring area.Thus, even though it is attenuated, it is still received because of its short distance. There was a problem that caused a failure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce radio interference that makes it difficult for reflected waves to reach the surface of a nearby area and makes the range of reflection obstruction as narrow as possible. It is to provide a wall structure.

[0007]

In wall structures to reduce interference according to the present invention in order to solve the above object, according to an aspect of the reinforcement
The curtain wall capable of transmitting a radio wave is formed in the concrete containing the fibers attached as an outer wall to the building structures, the building side of the inner said curtain wall Fit taken by upwardly inclined reflecting surface a plate-like radio wave reflector.

In addition, the radio wave reflector corresponds to a ceiling portion of a lower floor disposed below the curtain wall arranged vertically and a waist wall portion of an upper floor disposed above the curtain wall. Keru set is inclined over between the sites.

[0009]

According to the radio wave absorbing wall structure of the present invention having the above construction, an incoming radio wave is reflected by the radio wave reflector attached inside the curtain wall, but the radio wave reflector is attached at an angle. Since the reflecting surface is facing upward, the main beam direction of the reflected wave is upward compared to the case where the reflecting surface is vertical, which may cause reception impairment toward the surface of the nearby area near the building. The reflected wave becomes difficult to reach. On the other hand, the reflected wave reaches the distant area at a certain distance by the upward distance, but the intensity of the reflected wave becomes weaker as the distance increases, and as a result, the reflection impaired area becomes as narrow as possible. Become.

Further, since the radio wave reflector is provided so as to be inclined from a portion corresponding to the ceiling of the curtain wall of the lower floor arranged vertically above and below a portion corresponding to the waist wall of the curtain wall of the upper floor. The reflection area of each radio wave reflector can be increased, and the reflection efficiency can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a wall structure for reducing radio interference according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a wall structure for reducing radio interference according to the present invention. In FIG. 1, 2 is a beam of a building frame, 4 is a floor slab, 6 is a ceiling, 8 is a waist wall of the building frame, and 10 is a building. It is a curtain wall made of precast concrete which is attached to a skeleton and forms an outer wall portion.

As shown in FIG. 2, the curtain wall 10 is formed of a thin panel portion 12 and a rectangular frame portion 14 for securing strength, as shown in FIG. Here, the panel portion 12 and the frame portion 14 are not provided with reinforcing bars made of a material that reflects radio waves, such as a reinforcing bar or a carbon fiber rod, and are formed to easily transmit broadcast radio waves.

That is, the panel portion 12 is made of a fibrous reinforcing material (glass
, Kevlar fiber, Nylon fiber, etc.) , a radio wave absorber 16 made of a ferrite tile or the like that is formed to be thin and has a high strength by mixing with a concrete cleat containing the ferrite tile that absorbs radio waves. It is fixed, and the broadcast radio wave passing therethrough is attenuated.

Further, the frame portion 14 is provided with the curtain wall 10.
Is formed in a thick rectangular shape along the outer peripheral edge of the panel, and the panel portion 12 is integrally joined to the front surface thereof.

Here, in the curtain wall 10 of the illustrated example, the panel section 12 is composed of an upper panel section 12a and a lower panel section 1a.
2b are divided into upper and lower parts.
The windows 2a and 12b are separated from each other, and a window hole 20 to which the sash glass 18 is attached is formed therebetween.
The upper panel 12a and the lower panel 12b defining the upper and lower edges of the window hole 20 are integrally formed with ribs 13 projecting rearward and reinforced.

The curtain wall 10 includes upper and lower panel portions 12a and 12b formed in advance.
As shown in FIG. 3, the outer surface side where the radio wave absorber 16 is fixed is placed downward with a predetermined distance therebetween in the outer mold 22, and the inner mold 24 is placed thereon. A rectangular annular casting space 2 defined by the inner mold frame 24 and the outer mold frame 22
Concrete is poured into 6 to be formed. Thereby, the curtain wall 10 made of precast concrete in which the panel portion 12 and the frame portion 14 are integrated is obtained.

By the way, the curtain wall 10 is attached to a building frame to define an outer wall portion. On the building side inside the curtain wall 10, a space between the curtain wall 10 and the inner wall is provided.
A plate-shaped radio wave reflector 28 for reflecting a broadcast radio wave transmitted through the curtain wall 10 is provided to be inclined with its reflection surface facing upward. The radio wave reflector 28 is made of a conductive material such as a metal plate or a metal mesh. In the case of a metal mesh, one having a mesh size suitable for the wavelength band of the broadcast radio wave is used.

Here, in the illustrated embodiment, the radio wave reflector 28 is provided on the curtain wall 1 arranged vertically.
0, 10, the upper panel portion 12a of the curtain wall 10 on the lower side by vertically traversing the rear of the seam.
Is provided in an inclined manner in a single configuration from a portion corresponding to the ceiling portion of the lower floor where is located to a portion corresponding to the waist wall portion 8 of the upper floor where the lower panel 12b where the upper curtain wall 10 is located. Have been. Further, the space between the curtain wall 10 and the inner wall on the building side is closed by a decorative panel 30 provided along the window hole 20.

Therefore, in the above-described wall structure for reducing radio interference according to the present embodiment, the broadcast radio wave coming from the transmission antenna of the broadcast tower is reflected by the radio wave reflector 28 mounted inside the curtain wall 10. At this time, the light is absorbed and attenuated when transmitted through the radio wave absorber 16 on the outer surface of the curtain wall 10 twice before and after the reflection.
Further, since the radio wave reflector 28 is mounted obliquely and its reflection surface faces upward, the main beam direction of the reflected wave is upward as compared with the case where the reflection surface is vertical.

For this reason, it is difficult for the reflected wave that causes the reception failure to reach the surface of the neighborhood near the building.
In addition, the reflected wave reaches a distant area at a certain distance from the building to the extent that the main beam direction is upward, but the reflected wave is absorbed by the radio wave absorber 16 and its intensity is attenuated. In addition, the farther the distance, the further the intensity becomes weaker, and as a result, the area of the reflection obstruction becomes as narrow as possible.

Further, with respect to the curtain walls 10 arranged vertically above and below, the waist inside the lower panel 12b of the upper curtain wall 10 from the portion corresponding to the ceiling inside the upper panel portion 12a of the lower curtain wall 10. A radio wave reflector 28 is provided so as to be inclined between the portion corresponding to the wall portion 8.
Therefore , the reflection area of each radio wave reflector 28 can be increased,
The reflection efficiency can be improved.

The radio wave reflectors 28 need to be electrically connected to each other in the lateral direction where they are arranged side by side.

[0024]

As described in detail in the above embodiments, according to the wall structure for reducing radio interference according to the present invention, incoming radio waves are reflected by the radio wave reflector mounted inside the curtain wall, At this time, since the radio wave reflector is attached at an angle and its reflection surface faces upward,
The main beam direction of the reflected wave is upward as compared with the case where the reflecting surface is vertical. Therefore, it is difficult for reflected waves that cause reception interference to reach the surface of the nearby area near the building, and the reflected waves reach the distant area some distance away. As the intensity of the waves becomes weaker, the result is that the area of impaired reflection is as narrow as possible.

Further, since the radio wave reflector is provided so as to be inclined from a portion corresponding to the ceiling of the curtain wall of the lower floor arranged vertically above and from a portion corresponding to the waist wall of the curtain wall of the upper floor, The reflection area of the radio wave reflector can be made as large as possible, and the reflection efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a wall structure for reducing radio interference according to an embodiment of the present invention.

FIGS. 2A and 2B show a curtain wall in FIG. 1, wherein FIG. 2A is a front view and FIG.

FIGS. 3A and 3B are explanatory views of a mold used for producing the curtain wall of FIG. 2, wherein FIG. 3A is a side sectional view and FIG. 3B is a plan view.

[Explanation of symbols]

2 beam 4 floor slab 6 ceiling 8 waist wall part 10 curtain wall 12 panel part 12a upper panel part 12b lower panel part 13 rib 14 frame part part 16 radio wave absorber 28 radio wave reflector

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-76941 (JP, A) JP-A-5-248013 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 2/56-2/70 E04B 2/88-2/96 E04B 1/92

Claims (1)

(57) [Claims] 1. A curtain wall formed of concrete containing reinforcing fibers and capable of transmitting radio waves is attached as an outer wall to a building frame, and a plate-shaped radio wave reflector is inclined on a building side inside the curtain wall with a reflecting surface upward. mounting by, with respect to the curtain wall the wave reflector which is arranged vertically, spandrel portion corresponding site of the upper floor is arranged in the ceiling portion corresponding portion and the upper side of the lower floor which is disposed on the lower side And a wall structure for reducing radio interference.