JP2000188138A - Top point member of ground rod, and burying method for ground rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and inexpensive member capable of obtaining an effective reduction effect by taking a sufficiently large contact area between a ground rod and reducing agent, and provide a burying method for the ground rod. SOLUTION: After a hard top point member 1 having a sharp tip part 1a and a rear end part 1b with larger diameter than the diameter of a ground rod 4 is attached to the tip part of the ground rod 4, a space 3 is formed between the ground rod 4 and the ground 10 by knocking it into the ground from the bottom of a drilling hole 7 filled with reducing agent, and the reducing agent 5 is introduced in the space 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of electric power and communications, in which a grounding resistance reducing agent is introduced between the grounding rod and the ground at the tip of the grounding rod buried underground for grounding. The present invention also relates to a top point member attached to form a space for injection and a method of burying a ground rod.

[0002]

2. Description of the Related Art In the field of electric power and communication, the outer peripheral surface of an earth rod 4 and the earth are reduced in order to reduce the electric resistance between the earth rod 4 buried underground and the earth 10 by chemical treatment of the soil. There is a method of injecting a grounding resistance reducing agent (hereinafter, referred to as a reducing agent) 5 between the substrate 10 and the substrate.

Conventionally, as shown in FIG. 5, this reducing agent 5 is poured into an excavation hole 7 excavated to a predetermined depth L3 to bury an earth rod 4, or as shown in FIG. And additional depth L4 from the predetermined depth L3 with the heavy equipment for excavation
Is formed by pouring the reducing agent 5 into the excavation hole 7 so that the reducing agent 5 is brought into contact with the substantially upper portion and the intermediate portion of the earth rod 4. Reference numeral 6 denotes a lead wire having one end connected to the ground rod 4.

Further, as shown in FIGS. 7 and 8, after digging a drilling hole 7 having a predetermined depth L3, a boring hole 9 is drilled by a boring device 8, into which an earth rod 4 is inserted and a reducing agent is inserted. There is also a method of injecting 5.

[0005]

However, in the conventional method of pouring the reducing agent 5 into the excavation hole 7,
In any case, a sufficient contact area between the earth rod 4 and the reducing agent 5 cannot be secured, so that an effective ground resistance reducing effect cannot be obtained.

In the conventional method of forming a boring hole 9 and injecting it into the hole, an earth rod 4 and a reducing agent 5 are used.
Although the contact area with the steel can be increased, there is a problem in that a complicated operation involving a danger of boring and a high cost are required.

Therefore, an object of the present invention is to provide a safe, simple and low-cost, sufficiently large contact area between the earth rod and the reducing agent, and an effective ground resistance. An object of the present invention is to provide a member capable of obtaining a reduction effect.

It is another object of the present invention to reduce the contact area between the earth rod and the reducing agent sufficiently at a low cost and easily, and to effectively reduce the ground resistance. An object of the present invention is to provide a method of burying a ground rod which can obtain an effect.

[0009]

In order to achieve the above object, a top point member (1) of an earth rod according to the present invention has a rigid structure attached to a tip portion of the earth rod (4). And the tip (1a) is sharply set to easily drive the earth rod (4) into the ground,
The rear end (1b) is provided with a ground rod (4) so as to form a space (3) between the ground rod (4) and the ground (10) sufficient to inject the reducing agent (5) after driving. The diameter is set to be larger than the diameter of.

According to a second aspect of the present invention, the top point member (1) of the earth rod according to the first aspect has a rear end (1b) having a columnar shape and a front end (1a). It is characterized in that it has a conical shape that continues smoothly from the rear end (1b).

Further, the top point member (1) of the earth rod according to the third aspect is the invention according to the second aspect, wherein a spiral is formed on the outer peripheral surface of the conical tip (1a). Features.

According to a fourth aspect of the present invention, there is provided a method of embedding an earth rod, wherein the tip (1a) is provided at the tip of the earth rod (4).
The bottom of the excavation hole (7) into which the reducing agent (5) is injected after attaching a hard top point member (1) having a sharper and a rear end (1b) having a diameter larger than the diameter of the earth rod (4) is attached. Between the earth rod (4) and the earth (10) by driving into the ground, and corresponds to the difference between the diameter of the rear end (1b) of the top point member (1) and the diameter of the earth rod (4). The method is characterized in that a space (3) having a width to be formed is formed, and a reducing agent (5) is introduced into the space (3).

According to a fifth aspect of the present invention, there is provided a method of embedding an earth rod, wherein the tip (1a) is provided at the tip of the earth rod (4).
Is sharp and the rear end (1b) is attached to a hard top point member (1) having a diameter larger than the diameter of the earth rod (4).
And the rear end portion (1b) of the top point member (1)
A space (3) having a width corresponding to the difference between the diameter of the ground rod (4) and the diameter of the earth rod (4) is formed, and the reducing agent (5) is injected into the space (3). The symbol in parentheses is
The corresponding elements or matters described in the drawings and the embodiments of the invention described later are shown.

According to the top point member of the earth rod according to the first aspect of the present invention, first, since the tip is set to be sharp, the earth rod having the top point member attached to the tip is When driven into the ground, it penetrates the ground with low resistance. And since the diameter of the rear end of this top point member is set to be larger than the diameter of the earth rod, when the earth rod is driven into the ground, it is formed by the rear end of the top point member. A space is formed between the buried hole and the earth rod having a smaller diameter. Therefore, by introducing or injecting the reducing agent into the space, the entire outer peripheral surface of the earth rod is covered with the reducing agent, and an excellent reduction effect is exhibited. Since this top point member is hard, it does not break when the ground bar is driven.

According to the second aspect of the present invention, in addition to the functions and effects of the first aspect, the rear end is formed in a columnar shape, and the front end is smoothly continuous from the rear end. As a result, the entire outer peripheral surface becomes a smooth surface without irregularities. Therefore, when it is driven into the ground together with the earth rod, the contact resistance with the ground is small, and it easily penetrates into the ground, and a space for injecting the reducing agent is formed simply, safely and easily.

Further, according to the third aspect of the present invention,
In addition to the function and effect of the second aspect of the present invention, since the spiral is formed on the outer peripheral surface of the conical tip portion, when the ground rod is driven into the ground, it rotates due to the contact resistance with the ground and makes contact with the ground. Relax the resistance. Therefore, the earth rod can be made easier to penetrate into the ground, and a space for introducing or injecting the reducing agent can be formed more simply, safely and inexpensively.

According to the method of embedding the earth rod according to the fourth aspect of the present invention, a hard top point having a sharp end and a slightly larger rear end than the diameter of the earth rod is provided at the tip of the earth rod. After the members are installed, they are driven into the ground from the bottom of the excavated hole into which the reducing agent has been injected. Therefore, the ground rod easily penetrates into the ground by the sharp tip. And, only by driving into the ground, a space having a width corresponding to the difference between the diameter of the rear end and the diameter of the ground rod is formed between the ground and the ground by the action of the rear end having a diameter larger than that of the ground rod. You. As a result, the reducing agent is naturally introduced into the space, so that the reducing agent can be brought into contact with the entire outer peripheral surface of the ground rod. In addition, as in the method of embedding the earth rod according to claim 5 of the present invention, after the space is formed by the top point member, the reducing agent is brought into contact with the entire outer peripheral surface of the earth rod by injecting the reducing agent into the space. You may make it do.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A top point member 1 of an earth rod according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partial cross-sectional view showing a state where the top point member 1 is attached to an earth rod 4 to which a lead wire 6 is connected and is driven into the ground. FIG. FIG. 3 is an enlarged front view showing an assembled state with the member 1, and FIG. 3 is an enlarged front view of the top point member 1. The same parts as those shown in the conventional example are denoted by the same reference numerals.

The top point member 1 of the earth rod according to the embodiment of the present invention is made of steel, and has a rear end 1b and a front end 1a.
It is composed of The rear end portion 1b has a cylindrical shape, and its diameter L2 is set to be approximately twice the diameter of the ground rod 4. An installation hole 2 is formed in the rear end portion 1b, and a front end portion of the ground rod 4 is fitted into the installation hole 2 and assembled. In addition, assembling of both can also be achieved by forming a screw in the front end portion of the ground rod 4 and the mounting hole 2 of the rear end portion 1b and screwing.

The tip 1a has a conical shape that is smoothly continuous from the cylindrical rear end 1b, and the tip (lower end) is set to be extremely sharp. Diameter L2 of top point member 1
And the height L1 differ depending on the ground rod 4 to which it is attached, but usually the diameter L2 is 20 to 60 mm in diameter and the height L
1 is about 70 to 150 mm.

When the top point member 1 having the above structure is attached to the tip of the earth rod 4 and is driven into the ground at a predetermined depth L5 from the bottom of the drilling hole 7 having a predetermined depth L3, a sharp tip 1a is formed. The earth rod 4 penetrates into the ground very smoothly by the action. The reducing agent 5 is injected into the formed excavation hole 7 before the top point member 1 is driven. Then, the rear end 1b having a diameter larger than the diameter of the ground rod 4 acts on the ground rod 4 and the ground 1.
0, a space 3 having a width corresponding to the difference between the diameter of the rear end portion 1b of the top point member 1 and the diameter of the earth rod 4
It is formed very easily, and the space 3 naturally has
Is introduced.

That is, by simply attaching the top point member 1 to the tip of the earth rod 4 and driving it into the ground, the reducing agent 5 is placed between the entire outer peripheral surface of the earth rod 4 and the ground 10.
The space 3 required for introducing the slab is formed simply, safely and at low cost. Therefore, the reducing agent 5 is formed in the space 3 thus formed.
Is introduced, the reducing agent 5 reliably contacts the entire outer peripheral surface of the ground rod 4. As a result, a high reduction effect can be obtained.

When the reducing agent 5 was introduced between the earth rod 4 and the earth 10 in this way, the average electric resistance per pole was 48 ohms. This shows that there is a remarkable reduction effect as compared with 95 ohms when the reducing agent is not used and 72 ohms when the reducing agent is injected by the conventional method. In addition, instead of injecting the reducing agent 5 in advance into the excavation hole 7 formed as in this embodiment, the reducing agent 5 is injected into the space 3 after the space 3 is formed by the top point member 1. Thus, the reducing agent 5 may be brought into contact with the entire outer peripheral surface of the earth rod 4.

As shown in FIG. 4, if a spiral is formed in the conical tip 1a, when the earth rod 4 is driven, the top point member 1 rotates due to the contact resistance between the spiral and the ground 10, Weakens its contact resistance. Therefore, the earth rod 4 penetrates smoothly into the ground with a small resistance, and the space 3 is formed more easily.

In the present embodiment, the rear end portion 1b has a cylindrical shape, and the front end portion 1a has a conical shape continuous therefrom. However, the present invention is not limited to such a shape. For example, the combination of the shapes of the rear end portion 1b and the front end portion 1a may be a column and a polygon, a polygon and a polygon, a polygon and a column, or a shape similar thereto. Further, the rear end portion 1b and the front end portion 1a may have a triangular cone or polygonal vertical cross-sectional shape that is smoothly and integrally continuous. Furthermore, in addition to forming a spiral on the outer peripheral surface of the conical tip 1a,
It is also possible to make it easier to drive the ground rod 4 by making it wavy or forming a cut in the vertical direction.

The molding material of the top point member 1 is not limited to steel, but may be any material having a rigidity that does not break when it is driven into the ground. Therefore, cast iron having high strength may be used.

When a plurality of grounding rods (connecting rods) 4 are connected and driven into the ground, the top point member 1 is attached to the tip of the most advanced grounding rod 4.
Thereby, the space 3 can be formed by driving the plurality of connected earth rods deep underground simply, safely and at low cost.

[0028]

As described above, according to the top point member of the earth rod according to the first aspect of the present invention, the earth rod can be easily driven into the ground with a small resistance by the sharp tip. And, by the rear end portion having a larger diameter than the diameter of the earth rod, a space necessary for introducing or injecting the reducing agent can be formed between the earth rod and the earth simply by driving the earth rod into the ground. . Therefore, the reducing agent can be brought into contact with the entire outer peripheral surface of the earth rod at a safe, simple, and low cost, and the reducing effect can be greatly improved.

According to the second aspect of the invention, in addition to the functions and effects of the first aspect, the rear end is formed into a columnar shape, and the front end is smoothly connected to the rear end. Because of the conical shape, the entire outer peripheral surface can be a smooth surface without irregularities. Therefore, the earth rod can be more easily and safely penetrated into the ground with a smaller resistance to form a space for injecting the reducing agent.

Further, according to the invention described in claim 3,
In addition to the functions and effects of the invention described in claim 2, since the spiral is formed on the outer peripheral surface of the conical tip portion, when the ground rod is driven into the ground, it rotates and the ground rod further penetrates into the ground. Make it easier. Therefore, a space can be formed more easily and safely by burying the earth rod in the ground.

According to the fourth aspect of the present invention, the grounding rod can be easily penetrated into the ground by the function of the sharp tip, and the grounding rod can be easily connected to the ground by the function of the rear end having a larger diameter than the grounding rod. A space having a width corresponding to the difference between the diameter of the rear end and the diameter of the earth rod is formed between the ground and the ground. Since the reducing agent is naturally introduced into this space, the reducing agent can be reliably brought into contact with the entire outer peripheral surface of the earth rod. Therefore, the reduction effect can be improved. In addition, as in the method of embedding the earth rod according to claim 5 of the present invention, after the space is formed by the top point member, the reducing agent is brought into contact with the entire outer peripheral surface of the earth rod by injecting the reducing agent into the space. The same effect as that of the fourth aspect can be obtained even if it is performed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a state in which a top point member of an earth rod according to an embodiment of the present invention is attached to the earth rod and buried underground.

FIG. 2 is an enlarged front view showing assembling of a top point member of the ground rod and a tip end portion of the ground rod in FIG.

FIG. 3 is an enlarged front view showing a top point member of the ground rod shown in FIG.

FIG. 4 is an enlarged front view showing a top point member of a ground rod according to another embodiment of the present invention.

FIG. 5 is a partial sectional view showing a first conventional example.

FIG. 6 is a partial sectional view showing a second conventional example.

FIG. 7 is a partial sectional view showing a third conventional example.

FIG. 8 is a partial sectional view showing a third conventional example.

[Description of Signs] 1 Top point member 1a Tip 1b Rear end 2 Assembly hole 3 Space 4 Ground rod 5 Ground resistance reducing agent 6 Lead wire 7 Drilling hole 8 Boring device 9 Boring hole 10 Ground L1 Length of top point member L2 Diameter of top point member (rear end) L3 Predetermined depth of drilling hole L4 Additional depth of drilling hole L5 Constant depth of penetration of top point member

Claims (5)

[Claims] 1. A hard member attached to a tip portion of an earth rod, wherein the tip portion is set sharp so as to easily drive the earth rod into the ground, and the rear end portion is formed after driving.
A top point member for the earth rod, wherein the diameter is set to be larger than the diameter of the earth rod so as to form a space between the earth rod and the ground sufficient to introduce or inject the grounding resistance reducing agent. . 2. A top point member for an earth rod according to claim 1, wherein said rear end portion has a cylindrical shape, and said front end portion has a conical shape which is smoothly continuous from said rear end portion. 3. A top point member for an earth rod according to claim 2, wherein a spiral is formed on an outer peripheral surface of said conical tip portion. 4. A drilling hole into which a grounding resistance reducing agent is injected after a hard top point member having a sharp tip and a rear end larger in diameter than the earth rod is attached to the tip of the earth rod. A space having a width corresponding to the difference between the diameter of the rear end of the top point member and the diameter of the ground rod is formed between the ground rod and the ground by driving the ground into the ground from the bottom of the ground. A method for burying a ground rod, wherein a grounding resistance reducing agent is introduced into the ground rod. 5. A hard top point member having a sharp tip and a rear end having a diameter larger than the diameter of the earth rod is attached to the tip of the earth rod. A space having a width corresponding to the difference between the diameter of the rear end of the top point member and the diameter of the ground rod is formed between the ground and the ground, and a ground resistance reducing agent is injected into the space. How to bury the ground rod.