JP2005019363A - Grounding body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grounding body for protecting a grounded body such as a building or an electric apparatus from a thunder surge or the like with a drastically improved anti-corrosion property, capable of completely eliminating the remaking of a grounding material due to corrosion wire breaking with improved grounding reliability ensued, and surely carrying out the protection of the grounded body. <P>SOLUTION: A requested drilled groove 2 or a drilled hole 6 is formed on the ground, in either of which, grounding members 4A, 4B, 7 formed by connecting a plurality of plate materials 4a or tube bodies 7a formed of pure titanium or titanium alloys are buried to construct the grounding bodies E1, E2 and E3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Technical field to which industry belongs]
The present invention relates to a grounding body for protecting a grounded body such as a building or an electric device from a lightning surge or the like.
[0002]
[Prior art]
Conventionally, in order to protect the grounded body from lightning surges, etc., a digging groove is dug in the ground in the horizontal direction, and a grounding member made of copper wire or copper strip is directly installed in this digging groove? Alternatively, a grounding resistance reducing material made of carbon and cement or the like is disposed on the grounding member, and then the ground groove is backfilled with soil excavated from the ground to construct a grounding body.
[0003]
Further, a drilling hole is drilled in the depth direction in the ground, and a tubular grounding member made of a metal material such as copper stranded wire or copper or plated iron is disposed in the drilling hole, After that, the ground hole was constructed by refilling the digging hole with soil excavated from the ground.
[0004]
In order to protect the human body and the grounded body, the grounding body has a ground resistance value stipulated by laws and regulations depending on the type of the grounded body, and requires a low grounding resistance due to the withstand voltage of the grounded body. Therefore, conventionally, several tens of meters or more, and in some cases, several hundreds of meters, digging digging grooves and digging holes and burying grounding members, or grounding members with a wide and wide mesh It was arranged in the shape.
[0005]
[Patent Literature]
The above-described conventional techniques are disclosed in Japanese Patent Laid-Open Nos. 5-74506, 7-153503, and 8-31472.
[0006]
[Problems to be solved by the invention]
Although the most preferable grounding body is constructed as the grounded body, corrosion sometimes progresses in a short period exceeding the expectation and the grounding member may be disconnected. In particular, the degree of corrosion of the grounding member is greatly different depending on the influence of soil, that is, earth resistivity, acidity, salinity, and the like. The higher the soil acidity, the higher the salinity of the soil, the lower the specific resistance of the soil, the greater the degree of corrosion of the grounding member, and in places where direct current is flowing, etc. There is a problem that is promoted.
[0007]
In addition, there is a problem in that the ground member causes galvanic corrosion due to galvanic phenomenon (a phenomenon in which corrosion is promoted by causing a battery action due to a potential difference), thereby causing disconnection.
[0008]
Furthermore, when embedding a grounding member in a digging hole disposed in the depth direction, a plurality of copper pipes and iron pipes having a predetermined length are joined together to constitute the grounding member. Therefore, there is a problem that the grounding member becomes a considerable weight, a heavy machine is required, the installation time of the grounding member becomes long, and the construction cost increases.
[0009]
Furthermore, when the grounding member is arranged in a mesh shape, the grounding member is built in a lattice shape in a large area, and thus a large amount of grounding members are used, resulting in a heavy weight and labor for transportation and installation work. There is a problem that becomes complicated.
[0010]
An object of the present invention is to solve the problems of the above-described conventional grounding body.
[0011]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problems, first, a grounding member constituting the grounding body is formed of pure titanium or a titanium alloy, and second, grounding constituting the grounding body. The member is configured by connecting a plurality of plate members, and thirdly, a grounding member configuring the grounding body is configured by connecting a plurality of tubes, and fourthly The insertion body having good conductivity is inserted into the tube of the grounding member constituting the grounding body.
[0012]
【Example】
In FIG. 1, 1 is the ground, and the ground 1 is formed with a digging groove 2 that is dug in a horizontal direction at least 75 cm deep from the ground surface. A grounding resistance reducing material 3 made of carbon fiber, carbon and cement powder or the like is disposed on the bottom 2a of the digging groove 2, and a grounding resistance reducing material disposed on the bottom 2a of the digging groove 2. 3, a long grounding member 4A made of pure titanium or a titanium alloy which is linear or plate-like and is lightweight and excellent in corrosion resistance is disposed. Reference numeral 5 denotes a connection conductor for connecting the ground member 4A to a grounded body (not shown). Thereafter, the digging groove 2 is backfilled with soil excavated from the ground 1. In addition, before the grounding member 4A is backfilled with soil, another grounding resistance reducing material 3 is disposed on the grounding member 4A, and then the digging groove 2 is formed by the soil excavated from the ground 1. You may make it backfill. In this way, the grounding body E1 is constructed.
[0013]
FIG. 2 uses a digging hole 6 formed by excavating the earth 1 several tens of meters or more substantially perpendicular to the depth direction instead of the digging groove 2 shown in FIG. It is. A grounding member 7 composed of a plurality of pipe bodies 7a such as a copper pipe or an iron pipe is disposed in the excavation hole 6 and then backfilled with soil. The tubular body 7a constituting the grounding member 7 is made of pure titanium or a titanium alloy that is lightweight, excellent in corrosion resistance and high in strength, like the grounding member 4A described above. Reference numeral 8 denotes a connection conductor for connecting the ground member 7 to a grounded body (not shown). In this way, the grounding body E2 is constructed.
[0014]
As shown in FIG. 3, the grounding member 4 </ b> A constituting the grounding body E <b> 1 shown in FIG. 1 is composed of a strip-like plate material 4 a made of pure titanium or a titanium alloy, for example. As an example, the strip-shaped plate material 4a has a width of 40 mm, a thickness of about 1 mm, and a length of about 3 m. In addition, a plurality of through holes 4b are formed in the belt-like plate material 4a at predetermined intervals.
[0015]
A plurality of strip-shaped plate members 4a are arranged so that the through-holes 4b drilled at the end of the strip-shaped plate member 4a as described above are overlapped, and the bolts B are inserted into the superimposed through-holes 4b, and the bolts By screwing the nut N to B, as shown in FIGS. 4 and 5, a predetermined number of belt-like plate members 4a are connected to form a long grounding member 4A having a desired length. become.
[0016]
6 and 7 show a terminal member 9 for connecting the grounding member 4A made of the strip-shaped plate material 4a to the connection conductor 5. FIG. The terminal member 9 is configured by attaching one end 9b1 of a substantially cylindrical connector 9b to a vertical portion 9a1 of an L-shaped metal fitting 9a whose front shape is substantially L-shaped, and a horizontal portion 9a2 of the L-shaped metal fitting 9a. Is formed with a through hole 9a3. The L-shaped metal fitting 9a constituting the terminal member 9 is made of pure titanium or a titanium alloy similarly to the band-shaped plate material 4a described above, and the connection tool 9b constituting the terminal member 9 is made of copper.
[0017]
The bolt B is inserted into the through hole 4b of the belt-like plate member 4a located at the end constituting the grounding member 4A and the through hole 9a3 formed in the horizontal part 9a2 of the L-shaped metal fitting 9a constituting the terminal member 9. At the same time, the nut member N is screwed onto the bolt B, so that the terminal member 9 is attached to the belt-like plate member 4a located at the end portion constituting the grounding member 4A. The connection conductor 5 is connected to the connection tool 9b of the terminal member 9, and the waterproof function is applied to the connection tool 9b of the terminal member 9.
[0018]
8 and 9 show a grounding member 4B according to another embodiment of the present invention.
[0019]
The grounding member 4B of this embodiment is basically the same as the grounding member 4A shown in FIGS. 3 to 7. However, in the grounding member 4B of this embodiment, strip-like plate members 4a having different lengths are used. A plurality of sheets are used, and the grounding member 4B has a portion on which the belt-like plate material 4a is overlapped. 8 and 9, a belt-like plate material 4a2 having an intermediate length is superimposed on the longest belt-like plate material 4a1, and the shortest belt-like plate material 4a3 is placed on the belt-like plate material 4a2 having an intermediate length. However, an example is shown in which the belt-like plate members 4a1, 4a2, 4a3 are overlapped so that one ends thereof are aligned. In the portion located on the terminal member 9 side, the three strip-shaped plate members 4a1, 4a2, 4a3 are overlapped, and the portion adjacent to the portion A1 where the three strip-shaped plate members 4a1, 4a2, 4a3 are overlapped In A2, two strip-shaped plate materials 4a2, 4a3 are stacked. The belt-like plate materials 4a1, 4a2, 4a3 are arranged so that the through holes 4b overlap with each other, and the bolts B are inserted into the overlapped through holes 4b and nuts N are screwed into the bolts B. A scale grounding member 4B is formed. The other configuration is the same as that of the ground member 4A shown in FIGS. It should be noted that the number of stacked strips 4a and the arrangement thereof can be appropriately set without being limited to the above-described embodiment.
[0020]
FIG. 10 shows a tube body 7a of the grounding member 7 constituting the grounding body E2 shown in FIG. 2, and the material of the tube body 7a is also pure titanium or a titanium alloy. As an example, the tubular body 7a is formed with an outer diameter of about 40 mm, a thickness of about 1 to 1,5 mm, and a length of about 3 m. A threaded portion 7a1 is formed on the outer periphery of one end of the tube 7a, and a threaded portion 7a2 that is screwed with the threaded portion 7a1 is formed on the inner periphery of the other end of the tube 7a. Yes. The pair of tube bodies 7a is formed by screwing a screw portion 7a1 formed on the outer periphery of the end portion of one tube body 7a and a screw portion 7a2 formed on the inner periphery of the end portion of the other tube body 7a. It is comprised so that it may be connected. Thus, the grounding member 7 having a desired length is configured by connecting a predetermined number of the tubular bodies 7a.
[0021]
FIG. 11 shows a terminal member 10 for connecting the connection conductor 8 to the grounding member 7 formed of the tubular body 7a. The terminal member 10 has a flange portion 10a. One end surface 10a1 of the opposite end surface of the flange portion 10a is connected to a cylindrical portion 10b formed with a screw portion 10b1 on the outer periphery. A substantially cylindrical connector 10c is connected to the other end surface 10a2 of the opposite end surface of the flange portion 10a. The terminal member 10 can be attached to the tube body 7a by screwing the screw portion 10b1 of the tube portion 10b with the screw portion 7a2 formed on the inner periphery of the end portion of the tube body 7a. The flange portion 10a and the cylindrical portion 10b constituting the terminal member 10 are made of pure titanium or a titanium alloy, and the connection tool 10c constituting the terminal member 10 is made of copper. The connection conductor 8 is connected to the connection tool 10c of the terminal member 10, and the waterproof function is applied to the connection tool 10c of the terminal member 10.
[0022]
In FIG. 12, another grounding body E3 using the grounding member 7 is shown.
[0023]
In this grounding body E3, a copper stranded wire 11 is inserted into a tubular body 7a constituting the grounding member 7. In the grounding body E3 having such a configuration, since the copper stranded wire 11 is inserted into the tube 7a, the copper stranded wire 11 is not in direct contact with the soil, and the tube 7a By applying a sealing treatment to the joint portion and the terminal portion, the copper stranded wire 11 is not corroded. Therefore, a life similar to that of the tubular body 7a is obtained, and a tubular body made of pure titanium or a titanium alloy. The resistance of the conductor can be reduced by 7a, and a large-current grounding body E3 can be obtained.
[0024]
In addition, when installing the grounding member 7 which consists of a some pipe body 7a in the digging hole 6 shown by FIG. 2, if a grounding resistance reduction material is filled between the digging hole 6 and the grounding member 7, Good. In FIG. 2, the grounding resistance reducing material is injected into the grounding member 7 from the tubular body 7a located at the upper end of the grounding member 7, and the grounding resistance reducing material is drilled in the lower part of the tubular body 7a located at the lower end. By discharging from the illustrated injection hole 7a3 into the gap formed between the digging hole 6 and the grounding member 7, a grounding resistance reducing material is provided between the digging hole 6 and the grounding member 7. Can be filled. Note that the tubular body 7a located at the upper end may be waterproofed.
[0025]
As described above, since the grounding members 4A, 4B, and 7 are formed by connecting a plurality of strip-like plate members 4a and tube bodies 7a made of pure titanium or a titanium alloy, a titanium material that is inferior in workability can be very easily obtained. The grounding members E1, E2, and E3 can be used as the grounding members 4A, 4B, and 7 constituting the grounding bodies E1, E2, and E3.
[0026]
Also, the capacity of the grounding member 4B can be appropriately changed by arbitrarily selecting the number of overlapping strips 4a.
[0027]
Furthermore, by arranging the copper stranded wire 11 in the tubular body 7a, it is possible to construct a grounding body E3 that can sufficiently cope with current characteristics inferior to those of a copper material or the like.
[0028]
Furthermore, since the strip-like plate material 4a and the tubular body 7a constituting the grounding members 4A, 4B, and 7 are formed of pure titanium or a titanium alloy, the corrosion resistance is remarkably improved, and the grounding member 4A due to corrosion breakage is provided. 4B and 7 can be completely eliminated, so that the grounding reliability can be improved and the grounded object can be reliably protected.
[0029]
Still further, since the belt-like plate member 4a and the tubular body 7a constituting the grounding members 4A, 4B, 7 are made of pure titanium or a titanium alloy, the weight of the grounding members 4A, 4B, 7 can be reduced ( In the present invention, it is about 1/20 that of a conventional copper tube.) Therefore, the construction time of the grounding bodies E1, E2, and E3 is shortened and the transportation cost of the grounding members 4A, 4B, and 7 is reduced. Can be realized.
[0030]
The titanium alloy forming the belt-like plate material 4a and the tubular body 7a constituting the grounding members 4A, 4B, and 7 described above has a pure titanium content in consideration of the weight reduction of the grounding members 4A, 4B, and 7, It is preferable that it is 50% or more.
[0031]
Although the example which arrange | positioned the copper strand wire 11 in the tubular body 7a is shown in the Example mentioned above, it is not restricted to a strand wire, It can also be set as a rod-shaped or tubular copper wire, and it is electroconductive. If it is favorable, not only copper but the insert which consists of appropriate materials, such as aluminum, can be inserted.
[0032]
【The invention's effect】
Since the grounding member constituting the grounding body is made of pure titanium or a titanium alloy, the corrosion resistance is remarkably improved, and the grounding member can be completely eliminated due to corrosion disconnection. As a result, the grounded body can be reliably protected.
[0033]
Since the grounding member is configured by connecting a plurality of plate members or pipes, a grounding member having a desired length can be manufactured very easily using a titanium material inferior in workability.
[0034]
Since the insert with good conductivity is inserted into the tube, the insert does not corrode. Therefore, the same life as the tube can be obtained, and the tube made of pure titanium or titanium alloy can be used. The resistance of the conductor can be reduced, and a large current grounding body can be obtained.
[0035]
Since the ground member is formed by connecting a plurality of plates or pipes, a titanium material inferior in workability can be used as the ground member very easily.
[0036]
Since an insert having good conductivity is inserted into the tube constituting the ground member, it is possible to construct a ground that can sufficiently cope with current characteristics inferior to those of a copper material or the like.
[Brief description of the drawings]
FIG. 1 is a perspective view including a partial cross-section in a state where a grounding body of the present invention is disposed in a digging groove excavated in the ground.
FIG. 2 is a vertical sectional view showing a state in which the grounding body of the present invention is disposed in a drilling hole excavated in the ground.
FIG. 3 is a plan view of a strip-shaped plate material that constitutes a grounding member of the grounding body of the present invention.
FIG. 4 is a plan view showing a state in which strip-like plate members constituting a grounding member of the grounding body of the present invention are connected.
FIG. 5 is a front view of a state in which a strip-shaped plate material constituting the ground member of the grounding body of the present invention is connected.
FIG. 6 is a plan view of a terminal member connected to a ground member constituting the ground body of the present invention.
FIG. 7 is a front view of a terminal member connected to a ground member constituting the ground body of the present invention.
FIG. 8 is a plan view showing a state in which a belt-like plate material constituting a grounding member of a grounding body according to another embodiment of the present invention is connected.
FIG. 9 is a front view of a state in which a strip-shaped plate member constituting a ground member of a ground member according to another embodiment of the present invention is connected.
FIG. 10 is a front view of a tube constituting a grounding member of still another grounding body of the present invention.
11 is a front view of a terminal member connected to a tubular body constituting the grounding member shown in FIG.
FIG. 12 is a partial front view of still another grounding body of the present invention.
[Explanation of symbols]
E1, E2, E3 ... Grounding bodies 4A, 4B ... Grounding member 4a ... Strip Sheet material 1 ... Earth 2 ... Drilling groove 6 ... ······························································································· ············ Terminal member 11 ································

Claims (4)

A grounding member, wherein the grounding member is made of pure titanium or a titanium alloy. The grounding member according to claim 1, wherein the grounding member is configured by connecting a plurality of plate members. The grounding member according to claim 1, wherein the grounding member is configured by connecting a plurality of pipes. The grounding body according to claim 3, wherein an insertion body having good conductivity is inserted into a tubular body constituting the grounding member.

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