JP2003147876A - Method for mounting lighting arrester work lead, and shielding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a ferromagnetic body such as a reinforcing bar, precise electronic equipment, an electric wire, etc., from adverse hindering effect by blocking and guiding an electromagnetic field generated on the periphery of a work lead due to a large current or a pulsed-current caused by a thunderbolt. SOLUTION: There is provided a method for mounting a lightning arrester work lead, according to which a work lead shielding cylinder 10 is arranged on the periphery of the lightning arrester work lead 4 in a longitudinal direction. The work lead shielding cylinder 10 is formed of a magnetic member 8 and a conductive member 9 which are arranged individually from each other, or formed of a laminate consisting of the magnetic member 8 and the conductive member 10. In this manner, the electromagnetic field generated on the periphery of the work lead is blocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a grounding wire for lightning protection and a shield mechanism, and more particularly to preventing electromagnetic field disturbance due to the grounding wire for lightning protection that adversely affects electronic equipment and equipment installed in a building. A method of constructing a grounding wire for lightning protection and a shield mechanism.

[0002]

2. Description of the Related Art A lightning rod or a ridged conductor that has been conventionally installed in a building is connected to a ground plate buried in the ground by a ground wire.

[0003] These lightning rods and raised conductors are installed so that when a lightning strike occurs, a large current of the lightning strike is prevented from flowing to a living body or a tree, and a large current is passed through an earth wire to a buried earth plate. It is something that
This avoids problems that could injure the human body or damage electronic devices and equipment installed in the building.

Therefore, as the form of the ground wire, there are applied a form in which a conductor is used as usual and a form in which a steel frame constituting a building body is used to also serve as a ground line. In the case of, use a conductor such as copper to bury it in the concrete of the frame and guide it into the ground to connect it to the ground plate, or partition a specific shaft in the building and conduct the conductor within that shaft. Is connected to the ground plate in the ground.

For this reason, a large current continuously flows at the time of a lightning strike or a high-frequency component of various frequencies is included in a short-time pulsed current in a ground wire made of a conductor or a steel frame. However, a strong current will flow, and a strong magnetic field will be generated around the ground wire. These strong magnetic fields have a strong influence on ferromagnetic materials such as reinforcing bars, precision electronic devices, electric wires, etc., and cause the following obstacles. Magnetization phenomenon for ferromagnetic materials, malfunction of precision electronic equipment, same-state failure due to induced current in electric wires Secondary failure such as color shift of TV caused by magnetization of rebar etc.

In particular, when the steel frame is used as the ground wire, the current path is not branched and identified by people.
These phenomena will occur in unspecified places, and will require a lot of labor even to confirm the position.

Regarding the influence of the above-mentioned problems caused by the magnetization, there has been no consideration of the measures taken in the building in the past, and in order to completely avoid the obstacle caused by the generation of a strong magnetic field, It is necessary to deal with all the magnetic phenomena described above.

For this reason, various proposals have been made, but one example is Japanese Patent No. 3072020. "Electrically isolated building" shown in that patent publication
Then, as shown in the outline in FIG. 5, a shield is provided so that the precision electronic device does not malfunction or be damaged by the electrostatic induction current generated by the charging current generated by lightning or the electric noise from the electric equipment.

The building 11 comprises a steel frame 12 as a skeleton. A lightning rod 13 is installed on the roof, and a grounding plate 15 is embedded in the lightning rod 13 and the foundation ground 14.
And are connected by a ground wire 16. Further, the equipment 17 is connected to the independent earth plate 1 via the noise absorbing device 18.
9 and the exposed metal portion of the window frame 20, the door and the like is connected to a separate ground plate 23 via a lightning arrester 21 and a ground wire 22.

The ground wire 16 of the lightning rod 13 and the ground wire 22 of the window frame 20 are housed inside a grounding system shaft 24 of an insulating structure arranged inside the building 11, whereby electrostatic induction is achieved. It is said that the electric current charged by lightning, lightning, etc. is shielded by the grounding shaft 24 to prevent electrical and magnetic leakage into the building 11 and prevent adverse effects on other devices.

Similarly, even if a high-voltage current flows from the lightning rod 13 to the ground wire 16 at the time of a lightning strike, the high-voltage current is shielded by the grounding shaft 24, which may adversely affect other devices in the building 11. It is said that it can be restrained as much as possible.

However, the electric and magnetic influences formed by the charged electric current and the high-voltage electric current are transmitted by the electromagnetic field, and the insulating structure does not exhibit any shielding performance against these electromagnetic fields. It is a thing.

Therefore, under the present circumstances in which the lightning rod is connected to the ground plate by connecting the ground wire, various situations such as a situation where a large current flows in the ground wire when a lightning strike occurs or a short-time pulsed current is generated. There are unsolved measures to prevent strong magnetic fields around the ground wire from exerting a strong influence on ferromagnets such as reinforcing bars, precision electronic equipment, or electric wires, etc., depending on the situation in which a current containing high-frequency components flows. There is an urgent need for immediate proposals for improvement measures.

[0014]

SUMMARY OF THE INVENTION The present invention proposes an improvement measure in view of the above situation, and closes and induces an electromagnetic field generated around a ground wire due to a large current or a pulsed current due to a lightning strike. By doing so, a method of constructing a grounding wire for lightning protection and a shield mechanism for preventing a ferromagnet such as a reinforcing bar, a delicate electronic device or an electric wire from being obstructively affected are provided.

[0015]

SUMMARY OF THE INVENTION A method of constructing a grounding wire for lightning protection according to the present invention is to provide a grounding wire shielding tube made of a magnetic material or a conductive material or a magnetic member and a conductive material so as to surround the periphery of the lightning protection grounding wire in the longitudinal direction. It is composed by arranging a grounding wire shielding cylinder that is laminated with members, and by doing so, it closes the electromagnetic field generated around the grounding wire, and it interferes with ferromagnetic materials such as reinforcing bars and precision electronic devices and electric wires. It prevents the influence.

Further, the shield mechanism according to the present invention is a shield mechanism used in each construction method of the above-mentioned lightning protection ground wire, and comprises a magnetic or conductive ground wire shielding tube or a laminated magnetic member and conductive member. It consists of a grounding wire shield tube and a grounding wire for lightning protection arranged in the grounding wire shield tube, which exerts a suppressing effect by closingly inducing an electromagnetic field generated around the grounding wire. In this way, it is possible to prevent a ferromagnet such as a reinforcing bar, a precision electronic device, or an electric wire from being obstructively affected.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A method of constructing a grounding wire for lightning protection according to the present invention is to provide a grounding wire shielding tube made of a magnetic material or a conductive material or a magnetic member and a conductive member so as to surround the lightning protection grounding wire in the longitudinal direction. It is made up by arranging a ground wire shield tube that is laminated to close the electromagnetic field generated around the ground wire, and has a disturbing effect on ferromagnetic materials such as reinforcing bars and precision electronic devices and electric wires. To prevent.

An embodiment of a method for constructing a grounding wire for lightning protection according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram of a building to which the present invention is applied. The building 1 is constructed with a steel frame as the frame,
The lightning rod 2 installed on the roof is connected to the earth plate 6 embedded in the foundation ground 5 through the earth wire 4 arranged inside the earth wire shielding cylinder 3.

Therefore, at the time of lightning strike to the lightning rod 2, a large current or a pulsed current containing various high frequency components is passed through the ground wire 4 to the ground plate 6, and around the ground wire 4. A magnetic field or a high frequency electric field is formed by each of these currents.

If no measures are taken, these magnetic fields or electric fields will have an obstructive effect on a ferromagnetic material such as a reinforcing bar, a precision electronic device arranged in a building, or an electric wire. In the building 1 to which the present invention is applied, a ground wire shielding cylinder 3 is installed, and a ground wire 4 is configured to be inserted into this.

As in the conventional example, the ground wire 4 may be made of a normal conductor or may be made of a steel frame forming the body of a building. In either case, the ground wire 4 is not used. A magnetic field or an electric field generated in the periphery is guided to the earth wire shielding cylinder 3 in a closed manner, and the earth wire shielding cylinder 3
Never diverge outside.

Therefore, in the building 1 to which the present invention is applied, there is no obstructive effect on a ferromagnetic material such as a reinforcing bar or a precision electronic device or electric wire arranged in the building.

The shield mechanism according to the present invention is a shield mechanism used in each construction method of the above-mentioned lightning protection ground wire, and comprises a magnetic or conductive ground wire shielding tube or a laminated magnetic member and conductive member. It consists of a ground wire shielding cylinder composed of and a lightning protection ground wire arranged in the ground wire shielding cylinder, and exerts a suppressing effect by closingly inducing an electromagnetic field generated around the ground wire, and the reinforcing bar. It prevents the ferromagnetic materials such as the above and delicate electronic devices or electric wires from being obstructed.

Embodiments of the shield mechanism according to the present invention will be described below in detail with reference to the drawings.

2 to 4 are schematic views of the shield mechanism according to the present invention, and the shield mechanism 7 is composed of the ground wire shielding cylinder 3 and the ground wire 4 arranged inside thereof.

FIG. 2 shows an embodiment of a shield mechanism which is effective when lightning continuously discharges.

Continuation of continuous discharge will generate a magnetic field around the ground wire 4, so the ground wire shield cylinder 8
Surrounds the ground wire 4 to form a closed magnetic path to circulate magnetic flux.

Therefore, the material of the earth wire shielding cylinder 8 is preferably a magnetic material such as silicon steel plate, nickel, amorphous, etc., and the thickness of the earth wire shielding cylinder is such that it is not saturated even in a large magnetic field at the time of lightning strike. Is selected.

When the magnetic material is plate-shaped, it is possible to deal with a strong magnetic field by layering the magnetic material. The shape is not limited to a cylinder, but may be a square or the like according to the situation of the body or the like. The shape can be selected.

FIG. 3 shows an embodiment of a shield mechanism which is effective when the magnetic field is a pulsed current which disappears in a short time.

In the case of the present embodiment, since the magnetic field contains all frequency components, an induced current is generated around the ground wire 4 due to the fluctuation of the magnetic field. By surrounding the wire 4, a closed conductive path is formed so that the induced current is conducted.

This is because the induced current generates a magnetic field in the direction in which the original magnetic field is suppressed, so that it is effective for the earth wire shielding cylinder 9 to positively conduct the induced current.

Therefore, as the material of the ground wire shield cylinder 9, a conductor such as a copper plate, an aluminum plate, an iron plate is effective. The thickness of the ground wire shielding cylinder 9 is selected so that there is no saturation due to the induced current.

Further, as the shape of the ground wire shielding cylinder 9, as in the above-mentioned embodiment, besides the cylinder, a shape such as a square shape can be selected according to the situation of the body or the like.

FIG. 4 shows the implementation of an effective shield mechanism capable of coping with all cases, whether the lightning continuously discharges or the pulsed current whose magnetic field disappears in a short time. It is a form.

The earth wire shielding cylinder 10 and the earth wire shielding cylinder 8 which form a closed magnetic path surrounding the earth wire 4 when a magnetic field is generated around the earth wire 4 due to continuous discharge. It is composed of a ground wire shielding tube 9 which is laminated on the ground wire shielding tube 9 which forms a closed conductive path in response to an induced current induced by a fluctuation of a magnetic field containing all frequency components.

Since each structure of the ground wire shielding cylinder has been described above, detailed description thereof will be omitted. However, the earth wire shielding cylinder 8 is preferably made of a magnetic material, and the ground wire shielding cylinder 9 is Conductor made effective. Then, the thickness of each earth wire shield tube is selected so that it is not saturated even in a large magnetic field at the time of a lightning strike due to an induced current.

Therefore, when a shield mechanism composed of the earth wire shield cylinder 10 is adopted in a building, even if the lightning continuously discharges, the magnetic field due to the lightning disappears in a short time. Even if it is the current of the above, it is possible to prevent it so as not to have an obstructive effect on ferromagnetic materials such as reinforcing bars and precision electronic devices or electric wires in all lightning strikes. Although the present invention has been described in detail based on the embodiments, the method for constructing the ground wire for lightning protection and the shield mechanism according to the present invention are not limited to the above-described embodiments. It goes without saying that various changes can be made to the material and structure of the shielding tube by applying what is already known at the time of application, without departing from the spirit of the present invention.

[0040]

According to the method of constructing the ground wire for lightning protection according to the present invention, the periphery of the ground wire for lightning protection is surrounded in the longitudinal direction and the magnetic or conductive ground wire shielding cylinder or the magnetic member and the conductive member are laminated. Since a ground wire shield cylinder is installed, the electromagnetic field generated around the ground wire is closed to prevent it from interfering with ferromagnetic materials such as reinforcing bars, precision electronic devices, and electric wires. Is effective.

Further, the shield mechanism according to the present invention is arranged in an earth wire shielding cylinder made of a magnetic material or a conductor, or an earth wire shielding cylinder composed of a laminated magnetic member and a conductive member and an earth wire shielding cylinder. Since it consists of a grounding wire for lightning protection, it exerts a suppressing effect by closingly inducing the electromagnetic field generated around the grounding wire, and it interferes with ferromagnetic materials such as reinforcing bars and precision electronic devices or electric wires. It exerts the effect of preventing such influence.

[Brief description of drawings]

FIG. 1 is a schematic view of a building to which the method for constructing a grounding wire for lightning protection according to the present invention is applied.

FIG. 2 is an embodiment diagram showing a shield mechanism according to the present invention.

FIG. 3 is a diagram showing another embodiment of the shield mechanism according to the present invention.

FIG. 4 is a diagram showing another embodiment of the shield mechanism according to the present invention.

[Figure 5] Building diagram to which the conventional method of constructing a grounding wire for lightning protection has been applied

[Explanation of symbols]

1,11 Building, 2,13 Lightning rod, 3,8,9,1
0 ground wire shield cylinder 4, 16, 22 ground wire 5,
14 Foundation ground, 6, 15, 19, 23 Earth plate, 7
Shield mechanism, 12 steel frame, 17 facility equipment, 18
Noise absorber, 20 window frame, 21 lightning arrester, 2
4 Grounding shaft,

Claims (6)

[Claims] 1. A method for constructing a grounding wire for lightning protection, comprising a grounding wire shielding cylinder made of a magnetic material, which surrounds the grounding wire for lightning protection in the longitudinal direction. 2. A method for constructing a grounding wire for lightning protection, comprising a grounding wire shielding cylinder made of a conductor and surrounding the grounding wire for lightning protection in the longitudinal direction. 3. A method of constructing a grounding wire for lightning protection, which comprises arranging a grounding wire shielding cylinder in which a magnetic member and a conductive member are laminated so as to surround the grounding wire for lightning protection in the longitudinal direction. 4. A shield mechanism used in the method for constructing a grounding wire for lightning protection according to claim 1, wherein the grounding wire shielding cylinder is made of a magnetic material, and the lightning protection is arranged in the earthing wire shielding cylinder. A shield mechanism consisting of a ground wire for 5. A shield mechanism used in the method of constructing a grounding wire for lightning protection according to claim 1, wherein the grounding wire shielding cylinder is made of a conductor, and the lightning protection is arranged in the earthing wire shielding cylinder. A shield mechanism consisting of a ground wire for 6. A shield mechanism used in the method of constructing a ground wire for lightning protection according to any one of claims 1 to 3, which comprises a ground wire shield cylinder composed of laminated magnetic members and conductive members, and the ground. A shield mechanism consisting of a grounding wire for lightning protection arranged in a wire shielding cylinder.