JP2005237069A - Grounding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a low-grounding resistant grounding device that can serve as a grounded-body grounding conductor member suitable for a grounded body and as a lightning grounding conductor by individually installing the grounded-body grounding conductor member that grounds an abnormally high voltage applied to the grounded body and the lightning grounding conductor that grounds an abnormally high voltage of a lightning rod, and also allows the grounding matched to the grounded body to be performed . <P>SOLUTION: The grounding device is characterized in that the grounded-body grounding conductor member C that grounds the abnormally high voltage added to the grounded body 4 and the lightning grounding conductor 2 that grounds an abnormally high voltage of the lightning rod L are individually arranged at an excavation part a1 that is excavated in the ground A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a grounding device for protecting a grounded object (hereinafter referred to as a grounded object) such as a building or an electric device from a high voltage surge such as lightning.

Conventionally, when constructing a grounding device for a grounded body, an excavation part is provided by excavating soil on the ground around the grounded body, and an annular grounding device is provided by burying a copper material in an annular shape in the excavation part. The grounding of the building and the grounding of the lightning rod are collectively made the same by constructing, or by constructing a net-like grounding device by arranging copper materials in a mesh-like manner on the foundation part of the grounded body. It was grounded. And as a grounding conductor used for an annular grounding device and a net-like grounding device, a bare copper material is the main material. As an example, such a grounding device is disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 10-64650

However, in the conventional grounding device in which the copper material is buried in the excavation part described above and the grounding conductor is made of the copper material, it is buried directly in the ground, so that the earth resistivity and acidity of the soil are reduced. In addition, corrosion of the grounding conductor is accelerated due to the influence of the salinity concentration and the like, and the grounding conductor is broken, and the initial design life of the grounding device is shortened.

In addition, ground conductors made of copper and ground conductors integrated with conductive concrete mixed with carbon in concrete or concrete are less likely to cause breakage due to corrosion than ground conductors buried directly in the ground. In addition, although the life is long, when the ground conductor is not completely covered with concrete or conductive concrete, the ground conductor is galvanic due to the galvanic phenomenon due to the battery action at the current input / output portion where the change in the specific resistance of the soil is large. There was a problem that corrosion was accelerated and breakage occurred.

Further, it has been confirmed that corrosion is promoted in a place where a direct current flows in the ground. From this point, the conventional grounding device has a problem.

Furthermore, in recent years, a standard change related to grounding of Japanese Industrial Standards has been made, and development of a grounding device that satisfies the standard and prevents corrosion of the grounding conductor has been demanded.

An object of the present invention is to solve the problems of the above-described conventional grounding device.

In order to achieve the above-described conventional object, an object of the present invention is to provide a grounded device for grounding an abnormally high voltage applied to the grounded body at a drilling portion excavated in the ground. A grounding conductor member and a grounding conductor for a lightning rod that grounds the abnormally high voltage of the lightning rod are separately installed. Second, an abnormally high voltage applied to the grounded object is applied to the excavated part excavated in the ground. A ground conductor member for grounded body to be grounded and a ground conductor for lightning rod to ground an abnormally high voltage of the lightning rod are separately installed, and the ground conductor member for grounded body and the ground conductor for the lightning rod are connected in common. Thirdly, a grounded conductor member for grounding an abnormally high voltage applied to the grounded body and a grounding conductor for a lightning rod for grounding the abnormally high voltage of the lightning rod to an excavated part excavated in the ground. And install separately, at least The grounding conductor for the lightning rod is mainly made of copper or iron, and fourthly, grounding for the grounded body that grounds an abnormally high voltage applied to the grounded body to the excavated part excavated in the ground. A conductor member and a lightning rod grounding conductor for grounding an abnormally high voltage of the lightning rod are installed separately, and at least the lightning rod grounding conductor is covered with a conductive coating excellent in corrosion resistance.

Since this invention has the structure mentioned above, there can exist the effect described below.

Since the grounded conductor member for grounding that grounds the abnormally high voltage applied to the grounded object and the lightning rod grounding conductor that grounds the abnormally high voltage of the lightning rod are separately installed in the excavated part excavated in the ground, A grounded conductor member for a grounded body suitable for the grounded body and a grounding conductor for a lightning rod can be obtained, and grounding matching the grounded body can be achieved, and a grounding device with low grounding resistance can be obtained.

In the excavated part excavated in the ground, separately installed the grounded conductor grounding conductor member for grounding the abnormal high voltage applied to the grounded body and the lightning rod grounding conductor for grounding the abnormal high voltage of the lightning rod, Since the ground conductor member for the grounded body and the ground conductor for the lightning rod are connected in common, the ground conductor member for the grounded body can safely keep the voltage applied to the grounded body low, and the surge characteristics of high current for a short time A large current caused by a ground fault in which a current is generated can be quickly processed by mutual grounding between the ground conductor member for grounded object and the ground conductor for the lightning rod.

In the excavated part excavated in the ground, separately installed the grounded conductor grounding conductor member for grounding the abnormally high voltage applied to the grounded body and the lightning rod grounding conductor for grounding the abnormally high voltage of the lightning rod, and at least, Since the ground conductor for the lightning rod is mainly made of copper or iron, the grounded body can be protected by the ground conductor member for the grounded body while satisfying the standard of the lightning rod grounding, and the grounding for the grounded body By mutual grounding between the conductor member and the lightning rod ground conductor, a surge current having a large current for a short time can be quickly and safely processed.

In the excavation part excavated in the ground, a grounded conductor grounding conductor member for grounding the abnormally high voltage applied to the grounded body and a lightning rod grounding conductor for grounding the abnormally high voltage of the lightning rod are separately installed, and at least Since the ground conductor for the lightning rod is covered with a conductive coating having excellent corrosion resistance, the ground conductor for the lightning rod is not corroded even when buried in the ground and has a good electrical connection with the ground. A grounding device can be obtained.

Examples of the present invention will be described below. However, the present invention is not limited to the examples as long as the gist of the present invention is not exceeded.

Reference numeral 1 denotes a strip made of a metal material that is not easily corroded by ground soil such as a stainless steel material or a titanium material, and is excellent in corrosion resistance. In this embodiment, a metal material made of titanium is used. As an example, the strip 1 is formed by processing a titanium plate material into a predetermined width and length. In addition, through-holes 1a are formed in the strip 1 at predetermined intervals along the longitudinal direction.

2 is a lightning rod ground conductor in which the outer periphery of a linear metal conductor 2a mainly composed of copper or iron is covered with a conductive coating 2b in which synthetic resin is mixed with carbon or the like. It is buried in the excavation part a1. The cross-sectional area of the metal conductor 2a constituting the lightning rod grounding conductor 2 is preferably about 50 mm ² or more. Further, the lightning rod grounding conductor 2 may be one in which carbon particles are installed on the outer peripheral surface of the lightning rod grounding conductor 2 and covered with a fabric or netting material that does not spill the carbon particles.

In the excavation part a1 excavated in the ground A in advance, the above-described band material 1 is arranged in a lattice shape, and a titanium material is inserted into the through-hole 1a drilled in the band material 1 at the intersection of the band material 1. By inserting a bolt B made of a screw and screwing a nut made of a titanium material into the bolt B, the strip 1 is placed in a lattice shape in the excavation part a1 and has a predetermined width. A ground conductor member C for grounding body is formed.

Next, in the excavation part a1 excavated in the ground A, the ground member 1 is arranged close to the grounded conductor member C which is configured by arranging the strips 1 in a grid pattern, and the predetermined length described above. The lightning rod grounding conductor 2 is disposed, and a waterproof cap 3 made of plastic or the like is inserted into both ends of the lightning rod grounding conductor 2 so that both ends of the lightning rod grounding conductor 2 are waterproofed. Thereafter, the conductive coating 2b of the lightning rod ground conductor 2 located at the center is peeled off to expose the metal conductor 2a mainly composed of copper or iron.

Reference numeral 4 denotes a building, and a lightning rod L is installed at an appropriate place of the building 4, and the lightning rod L is coated with a metal conductor 5a such as a copper material and a jacket covering the outer periphery of the metal conductor 5a. One end of the metal conductor 5a of the down conductor 5 made of 5b is connected.

As described above, the lightning rod grounding conductor 2 has the metal conductor 2a exposed by peeling off the conductive coating 2b at the substantially central portion thereof. The exposed metal conductor 2a includes the above-described down conductor 5. The other end 5a ′ of the metal conductor 5a is connected at the connection portion D1.

Moreover, the metal conductor 5a is exposed to the down conductor 5 located in the excavation part a1 excavated in the earth A by peeling off the jacket 5b.

6 is a connection conductor composed of a metal conductor 6a such as a copper material and a jacket 6b covering the outer periphery of the metal conductor 6a. By peeling the jacket 6b at both ends of the connection conductor 6, The conductor 6a is exposed.

One of the exposed metal conductors 6a of the connection conductor 6 is connected to the exposed metal conductor 5a of the down conductor 5 located in the excavation part a1 excavated in the ground A as described above at the connection part D2. Further, the other exposed metal conductor 6a of the connection conductor 6 is connected to an appropriate band member 1 constituting the ground conductor member C for grounded body at the connection portion D3.

7 is a grounded conductor composed of a metal conductor 7a such as a copper material and a jacket 7b covering the outer periphery of the metal conductor 7a. The exposed metal conductor 7a at one end of the grounded conductor 7 is a grounded body. The metal conductor 7a exposed at the other end of the grounded conductor 7 is connected to an appropriate band material 1 constituting the grounding conductor member C for connection, and is connected to the grounded body such as the building 4 Has been.

The connecting portion D1 between the lightning rod grounding conductor 2 and the pulling conductor 5 and the connecting portion D2 between the pulling conductor 5 and the connecting conductor 6 are accommodated in a known appropriate waterproof connection box 8. . In addition, a connection portion D3 between the connection conductor 6 and an appropriate belt member 1 constituting the grounded body grounding conductor member C, a grounded conductor 7 connected to the grounded body, and a grounded conductor grounding member C for the grounded body are configured. The connecting portion D4 with the appropriate band member 1 is covered with a known tube 9 having an appropriate waterproof property.

The grounded conductor member C for grounded body installed as described above is integrated with concrete and conductive concrete by pouring conductive concrete in which carbon is mixed into raw excavation or raw concrete into the excavation part a1. It is configured to be Thereafter, the excavation part a1 excavated in the ground A is backfilled with soil. In this way, the grounding device is constructed.

When the lightning rod L installed in the building 4 receives lightning, the lightning current flows through the down conductor 5 to the grounded conductor member C for the grounded body and is absorbed by the ground. Since the lightning rod grounding conductor 2 is connected to the pulling conductor 5 at the connecting portion D1 located at the center thereof, the lightning current flows in two opposite directions from the connecting portion D1 to the ground. Therefore, the grounding device can be obtained in which the lightning current is quickly absorbed by the ground A and thus the rise of the ground potential is suppressed.

In addition, the lightning rod grounding conductor 2 having the conductive coating 2b can reduce ground resistance and prevent corrosion of the lightning rod grounding conductor 2, thereby preventing disconnection due to corrosion of the lightning rod grounding conductor 2, and the like. As a result, the lifetime and reliability of the grounding device can be improved.

Further, as described above, the band material 1 made of titanium material is arranged in a lattice shape, and the bolt B made of titanium material is inserted into the through hole 1a formed in the band material 1 at the intersection of the band material 1. Since the grounded conductor member C for grounded body is constituted by screwing a nut made of titanium material into the bolt B, the grounded conductor member C for grounded body made of titanium material having poor workability. Therefore, it is possible to obtain a long-life grounding device free from corrosion by minimizing the machining of titanium.

Furthermore, since a copper material is used as the ground conductor 2 for the lightning rod, the Japanese Industrial Standard (JIS standard) can be satisfied, and the outer periphery of the metal conductor 2a is made of a synthetic resin mixed with carbon or the like. Since the metal conductor 2a2 of the lightning rod grounding conductor 2 is not directly in contact with the ground A by covering with the coating 2b, it is possible to avoid the disconnection of the metal conductor 2a2 due to corrosion, and thus a long life and stable resistance. Can be obtained.

Furthermore, since the grounded conductor grounding conductor member C and the lightning rod grounding conductor 2 are connected via the connecting conductor 6, the grounded body grounding conductor member C and the lightning rod grounding conductor 2 interact with each other. An abnormally high voltage can be processed quickly and safely, and thus the potential rise can be kept low.

Further, when conductive concrete is disposed on the lightning rod grounding conductor 2 covered with the conductive conductive coating 2b, a linear metal conductor 2a mainly composed of a copper material or an iron material of the lightning rod grounding conductor 2 is used. The corrosivity of can be further improved.

The strip material 1 constituting the grounded conductor member C for the grounded body is not limited to a titanium material, and a stainless material can also be used. Moreover, as the metal conductor 2a which comprises the lightning rod grounding conductor 2, it is not limited to a copper material but may be an iron material.

The down conductor 5 is connected to an appropriate band 1 constituting the grounded conductor member C for the grounded body via the connection conductor 6 through the connection portion D2, and the down conductor 5 is connected through the connection portion D2. Although connected to the lightning rod grounding conductor 2, the connection portion D2 is omitted, and the pull-down conductor 5 is directly connected to the lightning rod grounding conductor 2 at the connection portion D1, and the connection portion D1 and the grounded conductor. You may connect with the connection part D4 to which 7 is connected.

As described above, as the material of the grounded conductor member C for the grounded body, a titanium material or a stainless steel material is used, a titanium material or a stainless steel material is formed on the belt material 1, and the belt material 1 is arranged in a lattice shape. Similarly, since the ground conductor member C for the grounded body is constructed by assembling with the bolt B and the nut formed from titanium material or stainless steel material, there is no occurrence of corrosion and reliability. A high grounding device can be obtained.

In addition, as described above, since the lightning rod grounding conductor 2 having the metal conductor 2a mainly composed of copper or iron is used, it is further excellent in corrosion resistance while ensuring the standard of Japanese Industrial Standards, and the earth. A grounding device in which the increase in potential is suppressed to a low level can be obtained.

FIG. 1 is a schematic perspective view of a grounding device according to the present invention installed in a building. FIG. 2 is a schematic side view of the grounding device of the present invention installed in a building. FIG. 3 is a partially enlarged plan view of the grounding device of the present invention.

Explanation of symbols

A ... Earth C ... Grounded conductor members D1 to D4 for grounded body ... Connection 1 ... .... Strip 2 ... Lightning rod grounding conductor 4 ... Building 5 ... Down conductor 6 ...・ ・ ・ ・ ・ ・ Connection conductor 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Grounded conductor

Claims (4)

The grounding conductor grounding member for grounding the abnormally high voltage applied to the grounded body and the lightning rod grounding conductor for grounding the abnormally high voltage of the lightning rod are separately installed in the excavated part excavated in the ground. A grounding device. The grounding device according to claim 1, wherein the grounded conductor grounding conductor member and the lightning rod grounding conductor are connected in common. The grounding device according to claim 1 or 2, wherein at least the ground conductor for the lightning rod is made of a copper material or an iron material as a main material. The grounding device according to any one of claims 1 to 3, wherein at least the lightning rod grounding conductor is covered with a conductive coating excellent in corrosion resistance.

Images