JP3155982B2 - Electromagnetic shield structure for very large space - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding structure for a very large space such as an ultra-high voltage inspection building for inspecting a power cable, and more particularly to an improvement in a floor portion.

[0002]

2. Description of the Related Art In recent years, the demand for electricity in society has been increasing steadily due to office automation (OA) and an increase in cooling power in the summer. For example, electric power companies have to increase the voltage at the power transmission area and reduce transmission loss. Therefore, an ultra-large-scale facility for various tests and measurements of ultra-high-voltage cables is required.

[0003] and, in such a facility in the 1MH _Z 70dB
Although a certain level of electromagnetic shielding performance is required, it has been rarely used in large-scale spaces.

Conventionally, in small-scale buildings, measures have been taken by coating a conductive material on the surfaces of ceilings, walls and floors of rooms and buildings, or by providing a shielding layer of metal foil or metal plate. This makes it difficult to satisfy the electromagnetic shielding performance.

In order to satisfy such electromagnetic shielding performance, it is desirable to form a double electromagnetic shield of a primary shield layer and a secondary shield layer. In Japanese Patent Publication No. 52-16351, as shown in FIG. Put the metal mesh 1 such as brass, copper or iron in the frame of the skeleton wall and cast concrete,
A skeleton wall 2 in which a metal mesh 1 is embedded is formed, and this is used as a primary shield.

[0006] Next, a metal plate 3 such as a brass plate, a copper plate, or a galvanized iron plate is attached to the inside of the frame wall 2 with a space therebetween to form a secondary shield. The primary shield and the secondary shield are completely electrically and physically insulated.

[0007] Each shield of the metal mesh 1 and the metal plate 3 is connected to a reinforcing bar of a foundation stake 5 by a conducting wire 4 and grounded into the ground.

[0008]

SUMMARY OF THE INVENTION As described above,
In the example disclosed in Japanese Patent Application Laid-Open No. 52-16351, a double electromagnetic shield is configured for the wall portion, but no consideration is given to the floor portion.

An object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to provide a double electromagnetic shield of a primary shield layer and a secondary shield layer as a shield for a very large-scale space. An object of the present invention is to provide an electromagnetic shielding structure for a very large-scale space in which a double electromagnetic shield can be formed easily and reliably.

[0010]

In order to achieve the above object, the present invention provides a concrete floor in a case where a double electromagnetic shield of a primary shield layer and a secondary shield layer is provided as a shield for a very large-scale space. Assuming that the lower streak forms the primary shield layer and the upper streak forms the secondary shield layer, the rebar mesh as the lower streak is connected to the primary shield layer of the wall, and the rebar mesh as the upper streak forms the second shield layer. Connect to the next shield layer, connect the reinforcing steel mesh as the lower reinforcing bar and the reinforcing steel mesh as the upper reinforcing bar to the steel plate provided at the top of the building pile with ground copper wire, and make contact with the underground part via the pile. It is an abstract.

According to the first aspect of the present invention, the reinforcing mesh serving as the lower reinforcing bar constituting the concrete floor is connected to the primary shield layer of the wall to form the primary shielding layer also at the floor portion. Is connected to the secondary shield layer of the wall to form the secondary shield layer also on the floor. Since the lower and upper rebar meshes are rebar meshes, it is possible to save time for welding rebars on site. The lower and upper streaks are buried in the concrete, so that concrete is interposed therebetween to maintain an electrical insulation relationship with each other.

Further, the grounding can be reliably performed by using the foundation pile as a grounding electrode.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of an electromagnetic shielding structure for an ultra-large-scale space according to the present invention, and FIG. 2 is a longitudinal sectional side view of a main part.

First, the structure of the wall portion will be briefly described. The building is made of a steel frame, in which 6 is an outer wall, 7 is an inner wall, 8
Indicates the steel frame of the building, but as the primary shield layer 9, the outer wall 6
An extruded hollow-molded cement plate was used as an outer wall material for forming the above, and a wire mesh was attached to the inside thereof. In addition, this wire mesh is regarded as a part of the primary shield layer 9 by connecting the ends to a column steel frame or the like, which is a constituent member of the building steel frame 8, by welding and electrically integrating them. I do.

On the other hand, a square wave iron plate made of a galvanized steel plate is used as the inner wall plate as the secondary shield layer 10, and the ends of the square wave iron plate are made of a socket-type copper wire with a whisker having terminals joined by a socket. Connect to the appropriate pitch.

The primary shield layer 9 including the building steel frame 8 and the secondary shield layer 10 are electrically insulated from each other by an insulating member such as an insulating tube or a bakelite washer.

The above is the wall portion. The floor portion is constituted by a concrete floor 11, and the reinforcing mesh as the lower reinforcing bar 12 forming the concrete floor 11 is a wire mesh forming the primary shield layer 9 of the wall. The reinforcing mesh as the upper bar 13 was connected to a square wave iron plate forming the secondary shield layer 10 of the wall.

The lower bars 12 and the upper bars 13, which are slab arrangements of these floors, are buried in concrete in this way, and are electrically insulated with concrete interposed therebetween. 12 forms the primary shield layer, and the upper stripe 13 forms the secondary shield layer. As an example, the lower streak 12 is about 6φ-100 × 100, all intersections are welded, and the upper streak 13 is about D10−150 × 150, 450
Weld and connect to a pitch.

Further, the lower and upper streaks 12 and 13 are connected to a grounding copper wire 15 and an iron plate 16 provided on the pile head of the foundation stake 5 by a PC pile, respectively, with a grounding copper wire (about 38 °). FIG. 3 shows an arrangement state of such a ground copper wire 15, and FIGS. 4 and 5 show an arrangement state of the ground copper wire 14.

In this manner, the lower stud 12 and the upper streak 13 are brought into contact with the underground portion by using the foundation stake 5 as a grounding pole, and the primary shield layer 9 and the secondary shield layer 10 are reliably contacted with the ground. Is what you do.

In this embodiment, the lower line 12 and the upper line 13 are integrated by a grounding copper wire 15 or a grounding copper line 14. It does not impair the insulation. However, as another embodiment, the lower streaks 12 and the upper streaks 13 may be connected to the ground copper wire 15 or the iron plate 16 provided on the pile head completely independently.

[0022]

As described above, the electromagnetic shielding structure for a super-large-scale space according to the present invention can be applied to a case where a double electromagnetic shield of a primary shield layer and a secondary shield layer is provided as a shield for a super-large-scale space. The double electromagnetic shield can be easily and reliably formed even in the portion.

[Brief description of the drawings]

FIG. 1 shows an electromagnetic shielding structure for a very large-scale space according to the present invention.
It is explanatory drawing which shows embodiment.

FIG. 2 shows an electromagnetic shielding structure for a super-large-scale space according to the present invention.
It is a longitudinal side view of the important section showing an embodiment.

FIG. 3 is a plan view showing an arrangement state of a grounded copper wire.

FIG. 4 is a longitudinal sectional side view showing an arrangement state of a ground copper wire.

FIG. 5 is a plan view showing an arrangement state of a ground copper wire.

FIG. 6 is a longitudinal sectional side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal mesh 2 ... Body wall 3 ... Metal plate 4 ... Conductor wire 5 ... Foundation stake 6 ... Outer wall 7 ... Inner wall 8 ... Building steel frame 9 ... Primary shield layer 10 ... Secondary shield layer 11 ... Concrete floor 12 ... Lower bar 13 … Upper line 14… ground copper wire 15… ground copper wire 16… iron plate

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshikiyo Sato 1-3-5 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Yasuo Yamamoto 1-3-3 Awaza, Nishi-ku, Osaka-shi, Osaka No.5 Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Masaaki Tanaka 1-3-5 Awaza, Nishi-ku, Osaka-shi, Osaka Prefecture Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Satoru Hama, Aichi Awaza, Nishi-ku, Osaka-shi, Osaka 3-5-5 Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Hiroshi Ishimoto 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Osaka Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Riki Inoue Osaka, Osaka 1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Shuzo Fujimura Konohana-ku, Osaka, Osaka No. 1-3, Ya 1 Sumitomo Electric Industries, Ltd. Osaka Works (56) References JP-A-48-9233 (JP, A) JP-A-63-172498 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) E04H 9/14 E04H 5/02 H05K 9/00 E04B 1/92

Claims (1)

(57) [Claims] When a double electromagnetic shield of a primary shield layer and a secondary shield layer is provided as a shield for a very large-scale space, a lower stratum constituting a concrete floor is a primary shield layer and an upper stratum is a two-strand shield. To form the next shield layer, a rebar mesh as the lower bar is connected to the primary shield layer of the wall, a rebar mesh as the upper bar is connected to the second shield layer of the wall, and a rebar mesh as the lower bar and An ultra-large-scale electromagnetic shield structure, characterized in that the reinforcing mesh used as the upper bar is connected to the steel plate provided above the building piles with ground copper wire, and is brought into contact with the underground part via the piles.