JPH08203574A - Grounding device and its installation - Google Patents

Abstract

PURPOSE: To obtain a very low resistance value and easily connect together earthing rods by means of a fitting pipe at tip, by using plural grounding rods mutually connected and using a lead terminal at front, integrally fixed with a fitting pipe and a rod piece. CONSTITUTION: Grounding poles 4, 4, 4 of conductive metal, such as copper pole or copper-coated steel pole, are disposed at bottoms of respective holes 1, 2, 3. The earthing pole 4 is a pole piece of square planer form. A recess portion 5 is formed along the whole length in the middle, a lead wire 7 is used for longitudinally wiring the reverse of a cover pole 6 covering the upper surface and connected to a terminal in an end portion. Grounding rods 12 of conductive metal rod, such as copper rod or copper-coated steel rod, are embedded in parallel to ground surface continuously toward a utility pole hole 3 and a dug hole 3 on side, starting at both sides of a middle hole 1 in the vicinity of its bottom. And thus, a lead terminal at front, 20 is attached integrally with a fitting pipe 18 and a rod piece 19, so that the connection to an earthing rod at front, 12a, is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding device for embedding in the ground to reduce ground resistance for the purpose of electrical safety at the time of a building pole such as a power pole for a pole of a transmission line, a distribution line, etc. It relates to the facility method.

[0002]

2. Description of the Related Art Conventionally, grounding work has been obligatory at the time of building poles such as utility poles in order to prevent damage such as safety and lightning strikes in the event of a power system accident. It is stipulated to be carried out based on "technical standards".

According to the regulations, there are various regulations,
For example, when burying the ground electrode, bury it at a depth of 75 cm or more from the ground surface. When installing a grounding wire along an iron pillar or other metal body, place the grounding electrode 30c from the bottom of the iron pillar.
Except when it is buried at a depth of m or more, it is stipulated that the ground electrode be buried 1 m or more away from the metal body in the ground.

However, since it is difficult to obtain a low resistance value by this regulation, as shown in FIG. 12, a large excavation hole 27 is formed on the side of the utility pole, and the ground electrode 2 is provided at the bottom of the excavation hole 27.
Three 8s are arranged at predetermined intervals and the ground wire 29 is connected to obtain a low resistance value.

[0005]

However, in this facility method, the ground must be dug large, which requires a lot of labor and cost, and the construction cost is high, so that the construction period is long and the dug is raised. Since a large amount of soil is
Since it could not be placed on site and had to be transported to another place, it was very troublesome, and at the time of embedding the excavation hole, the soil had to be returned from the transport destination to be filled, which was very troublesome and inconvenient.

Since the excavated area of the ground is large,
There was a problem that it was difficult to obtain the construction permit because the width of the road was restricted and it was necessary to block walking and vehicles, which caused a great deal of inconvenience. In addition, if there is a gutter at the side edge of the road, the gutter will be destroyed, and it will be necessary to reconstruct the gutter after landfilling, and the construction time will be long.

The present invention was developed with the object of solving the above-mentioned problems, and it is convenient that the required ground resistance can be obtained, the excavation area is small, and the excavated soil can be placed on site. It is an object of the present invention to provide a grounding device and a facility method thereof, which are characterized in that the grounding work can be reduced, the construction cost is low, and the construction is simple and easy.

[0008]

As a means for solving the above problems and achieving the object, the present invention provides a grounding electrode arranged at the bottom of a plurality of excavated holes in the ground and a ground between the excavated holes. A grounding device has been developed and adopted, which is composed of a connecting grounding rod which is driven horizontally in and a lead terminal which is connected to the foremost part and the last part of the grounding rod.

Further, according to the present invention, in the grounding device constructed as described above, the lead terminal at the foremost part is composed of a rod for attaching the lead wire to one end and integrally fixing the other end to the fitting pipe. The grounding device and the lead terminal at the foremost part consist of a rod body with a lead wire attached to one end and a fitting hole at the other end, and the lead terminal at the foremost part has a lead at one end. We developed and adopted a grounding device consisting of a fitting pipe with wires attached.

Further, according to the present invention, a central excavation hole having a predetermined depth, a lateral utility pole hole and a lateral excavation hole are excavated at predetermined intervals, and a grounding electrode is arranged at the bottom of each hole to form a central excavation hole. From the side to the lateral utility pole hole and the lateral excavation hole, by sequentially driving the grounding rod horizontally, connecting the central excavation hole and the lateral utility pole hole to the ground and the central excavation hole and the lateral utility pole hole to the ground. It is characterized by connecting with a rod and connecting the lead terminal to the front pole and the last ground rod reaching the side utility pole hole and the side excavation hole, and connecting to the ground pole arranged in each hole We have developed and adopted the grounding equipment facility method.

[0011]

[Operation] When the grounding rod is driven sequentially from the central drilling hole toward the lateral utility pole hole and the lateral drilling hole in the horizontal direction with the ground surface, the tip of the trailing grounding rod fits into the insertion hole of the preceding grounding rod. ,
Proceed to the left side and right side in sequence, and eventually the frontmost ground rod reaches the side utility pole hole and side excavation hole, respectively, and the middle of the central excavation hole and side utility pole hole and the central excavation hole and side excavation hole A low resistance value can be obtained by connecting the middle of the hole with a connecting ground rod.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The lateral utility pole hole 2 and the lateral excavation hole 3 are excavated at predetermined intervals.

Next, the ground electrodes 4, 4, 4 made of a conductive metal electrode such as a copper electrode or a copper-coated steel electrode are arranged at the bottom of each of the holes 1, 2, 3. As shown in FIGS. 7 to 9, the ground electrode 4 is a polar body having a quadrangular shape in plan view, and has a recess 5 formed over the entire lengthwise direction of the central portion thereof. Lead wire 7 along the length direction of the back surface of pole 6
Is wired and connected to the terminal 8 at the end.

Further, thin grooves 9 and slit holes 10 are alternately formed at regular intervals on the side of the ground electrode 4,
By pulling the protrusions 11, 11 provided on the side edges in the left-right direction, the narrow groove 9 and the slit hole 10 are extended in the horizontal direction to expand the ground contact area.
The ground electrodes 4 arranged in the second and third parts are arranged in a spread state.

A ground rod 12 made of a conductive metal rod such as a copper rod, a copper-coated steel rod, an iron rod, or a steel rod is drilled from both side surfaces near the bottom of the central drilling hole 1 to the side utility pole hole 2 and the side drilling. Drive toward the hole 3 horizontally and horizontally. At this time, if the grounding rod 12 is directly hit, it will be deformed, so an iron wedge (not shown) is fitted to the grounding rod 12, and the ironing wedge can be hammered in to strike the grounding rod 12 without damaging it.

The grounding rod 12 to be driven has a tip portion formed in a sharpened portion 13, has an insertion hole 14 in the rear end portion thereof which matches the shape of the sharpened portion 13, and has a rear end portion in the grounding rod 12. A fitting pipe 15 is fitted to the rear end portion and protrudes rearward by an appropriate length.

Then, the sharpened portion 13 of the trailing ground rod 12b is fitted into the insertion hole 14 at the rear end of the leading ground rod 12a,
The caulking portion 16 that strongly crimps the central portion of the outer peripheral surface of the fitting pipe 15 on the outer peripheral surface makes the inner peripheral surface of the fitting pipe 15 and the outer peripheral surfaces of the grounding rods 12a and 12b adhere to each other, and
5 is firmly fixed to the ground rods 12a and 12b.

The frontmost ground rod 12a that has been driven in is the grounding rods 12b, 12c, ...
To reach the side utility pole hole 2 and the side excavation hole 3. The ground rod 12 reaching the side utility pole hole 2 and the side excavation hole 3
The lead wire 17 is attached to one end of the end of a, and the other end is inserted into the fitting pipe 18 and the lead terminal 20 composed of the rod 19 which is crimp-integrated is connected to connect the lead wire 17 to the side utility pole hole. It is connected to the lead wire 7 of the ground electrode 4.

In addition to the above, the lead terminal 20 at the frontmost part may be formed of a rod body 22 having a lead wire 17 attached to one end and a fitting hole 21 at the other end, as shown in FIG. , And also, as shown in FIG.
It may be formed from the fitting pipe 23 to which is attached.

On the other hand, the ground rod 12n at the rear end is driven with the lead terminal 26 from the driving rod 25 having the lead wire 24 attached to the insertion hole 14 at the rear end thereof, and the lead wire 24 is attached to the central excavation hole 1. The grounding work is completed by connecting to the ground electrode 4, and when the work is completed, the soil piled up next to the dug hole may be filled.

[0021]

As described above, according to the grounding device of the present invention, by using a plurality of grounding rods connected to each other, an extremely low resistance value can be obtained and the deterioration of the performance can be prevented for a long period of time. . Further, since the grounding rod has been used in the conventional grounding work, there is the convenience that it can be used as it is. Further, if the lead terminal at the forefront is integrally fixed to the fitting pipe and the rod, the fitting pipe at the tip can be easily connected to the ground rod. Further, if the frontmost lead terminal is a rod body having a fitting hole at its tip, it can be driven and fitted, and the fitting force becomes strong. Further, if the fitting pipe with the lead wire attached is used, the lead wire can be easily attached.

Further, according to the grounding equipment facility method of the present invention, it is only necessary to dig a hole only at a position where the grounding electrode is filled, and it is not necessary to dig a wide area of a road as in the conventional case, which requires labor and cost. Since the cost will not be low, the construction cost will be low and the construction period will be short. Furthermore, with this facility method, since excavated soil can be piled up on the ground surface between the holes, workability is improved, and since the excavation area is small, the pavement area for road repair after construction is small. There is.

[Brief description of drawings]

FIG. 1 is a simplified vertical cross-sectional view showing a facility state of a grounding device of the present invention.

FIG. 2 is a simplified front view of a state in which grounding rods are connected.

FIG. 3 is a simplified vertical sectional view showing a ground rod and a joint portion of the ground rod.

FIG. 4 is an enlarged vertical sectional view taken along the line AA of FIG.

FIG. 5 is a simplified vertical cross-sectional view of a lead terminal connected to the frontmost ground rod.

FIG. 6 is a simplified vertical cross-sectional view of a lead terminal connected to a ground rod at the rearmost portion.

FIG. 7 is a plan view of a ground electrode.

FIG. 8 is a side view of a ground electrode.

FIG. 9 is a front view of a ground electrode.

FIG. 10 is a simplified vertical cross-sectional view of another lead terminal connected to the frontmost ground rod.

FIG. 11 is a simplified vertical cross-sectional view of still another lead terminal connected to the frontmost ground rod.

FIG. 12 is a simplified vertical cross-sectional view showing a facility state of a conventional grounding device.

[Explanation of symbols]

 1 Central Drilling Hole 2 Side Utility Hole 3 Side Drilling Hole 4 Grounding Electrode 12 Grounding Rod 12a Grounding Rod 12a Frontmost Grounding Rod 12n Final Grounding Rod 20 Frontmost Lead Terminal 26 Last Leading Terminal

Claims (5)

[Claims] 1. A ground electrode arranged at the bottom of a plurality of excavated holes in the ground, a connecting ground rod driven horizontally in the ground between the excavated holes, and connected to the foremost part and the rearmost part of the ground rod. A grounding device, comprising: 2. The grounding device according to claim 1, wherein the frontmost lead terminal is composed of a rod to which a lead wire is attached at one end and the other end is integrally fixed to the fitting pipe. 3. The grounding device according to claim 1, wherein the frontmost lead terminal is composed of a rod body having a lead wire attached to one end and a fitting hole formed at the other end. 4. The grounding device according to claim 1, wherein the lead terminal at the foremost part is composed of a fitting pipe having a lead wire attached to one end thereof. 5. A central excavation hole having a predetermined depth, a lateral utility pole hole and a lateral excavation hole are excavated at predetermined intervals in the ground, and a grounding electrode is arranged at the bottom of each hole, and the central excavation hole is provided with a lateral utility pole. The grounding rods are sequentially driven horizontally toward the holes and the lateral drilling holes, and the central grounding hole and the lateral utility pole hole are grounded, and the central drilling hole and the lateral drilling hole are grounded by the connecting grounding rod. , A grounding device characterized by connecting a lead terminal to the front pole and the rearmost ground pole reaching the side utility pole hole and the side excavation hole, and connecting to the ground pole arranged in each hole Facility method.