JPH0878130A - Method for burying ground electrode - Google Patents

Abstract

PURPOSE: To continue a regulated grounding resistance value as a grounding electrode for a long time by filling highly permeable sand while blowing out a reducing agent through a number of nozzles of the grounding electrode inserted into a vertical hole drilled in the ground. CONSTITUTION: A vertical hole 6 having prescribed depth and diameter is formed in the ground 5. A copper pipe grounding electrode 7 having a hollowed pipe form having a number of exhaust nozzles 10 bored on the circumferential wall is inserted to the center of the hole 6 until the lower end part gets close to the bottom part of the hole 6, and the upper end side is connected to the discharge side of a compressor 8 through a connecting hose 9. While a reducing agent for reducing the grounding resistance value such as sodium silicate or urea resin is pressure-injected from the exhaust nozzles 10 into the hole 6 through the electrode 7 by the pressure of the compressor 8, highly premeable sand 11 is filled from the upper side of the electrode 7 to form a homogeneous reducing agent distributed part 12 around the electrode 7. The hose 9 is then removed, and a lead wire is pressure-connected to form the grounding electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a ground electrode.

[0002]

2. Description of the Related Art The Electricity Business Law stipulates grounding for electric lines and other electric works. In high-voltage long-distance transmission lines, electrical equipment and transmission lines are grounded to a grounding electrode buried in the soil near the utility pole. As a method for burying this grounding electrode, generally, a grounding electrode such as a copper wire is driven into the soil almost vertically and a grounding electrode such as sodium silicate or urea resin is ground around the driven grounding electrode. A reducing agent is poured to reduce the ground resistance.

In the above-mentioned method of burying the grounding electrode, the reducing agent cannot be evenly distributed around the grounding electrode which is almost vertically driven into the soil, and the reducing agent is mainly applied only on the surface side of the ground. Since it was disseminated, the sustainability of the ground electrode was low.

Further, in the method of burying the ground electrode described above, the reducing agent cannot be evenly distributed around the ground electrode driven almost vertically into the soil, and is mainly reduced only on the surface side of the ground. Since the agent is spread, it is difficult to form a large ground electrode as a result.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to spread the reducing agent evenly around the grounding electrode inserted almost vertically into the soil and completely wrap the grounding electrode with the reducing agent. By so doing, it is possible to increase the sustainability as a ground electrode, and to provide a method for burying a ground electrode that can form a large ground electrode.

[0006]

In order to achieve the above object, a method of burying a ground electrode according to the present invention is such that a vertical hole having a predetermined depth and diameter is dug in soil and a large number of jets are injected into the vertical hole. A hollow tube-shaped grounding electrode having a mouth formed in its peripheral wall is inserted, the upper end side of the grounding electrode is connected to a compressor through a hose, and a large number of injection ports formed in the grounding electrode by the pressure of the compressor. While injecting a reducing agent such as sodium silicate or urea resin to reduce the ground resistance value into the vertical hole, add highly penetrating sand for filling into the vertical hole from the upper side of the ground electrode. It is characterized in that the introduced sand and the pressure-injecting reducing agent are mixed and gradually filled around the ground electrode from the lower side of the vertical hole.

In order to achieve the above object, the method for burying a ground electrode according to the present invention digs a vertical hole having a predetermined depth and diameter in soil, and expands the internal volume of the vertical hole into the vertical hole. Insert a mesh bag having substantially the same internal volume, and insert a hollow tube-shaped grounding electrode having a large number of injection holes in its peripheral wall at the center of the meshed bag, and insert the upper end side of the grounding electrode into the grounding electrode. It is connected to a compressor through a hose, and a reducing agent for reducing the ground resistance value such as sodium silicate or urea resin is injected into the vertical hole from a number of injection ports formed in the ground electrode by the pressure of the compressor. While inserting the highly penetrating sand for filling into the mesh bag from the upper side of the ground electrode,
It is characterized in that the added sand and the pressure-injecting reducing agent are mixed and gradually filled around the ground electrode from the lower side of the bag in the mesh bag.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show an execution procedure of an embodiment of a method for burying a ground electrode according to the present invention. First of all,
As shown in, hole 1 with a depth of 75 cm to 100 cm
The guide permeation tube 2 in which the spiral screw-in portion 3 having a diameter of about 10 cm is formed on the head at the center of the is vertically stood, and is vertically screwed into the soil 5 while being rotated by the rotational driving force of the rotor 4. The penetration of the guide penetration tube 2 is performed while repeatedly connecting the penetration tube up to a predetermined depth of 3 m to 5 m. Next, as shown in FIG. 2, the guide permeation tube 2 that has reached a predetermined depth is reversely rotated and pulled out from the soil 5.
When collapse of the vertical hole 6 excavated due to soil properties or the like is predicted at the time of this withdrawal, a reducing agent (soil stabilizer) is pressure-injected to condense and then the guide permeation tube 2 is withdrawn. In this way, from the depth of 3m to 5 in the soil 5
A predetermined vertical hole 6 having a diameter of about 10 cm is formed. Next, as shown in FIG. 3, a ground electrode 7 made of a copper tube is inserted into the center of the vertical hole 6 so that the lower end of the ground electrode reaches near the bottom of the vertical hole, and the upper end side of the ground electrode 7 is inserted. Is connected to the discharge side of the compressor 8 via a connection hose 9. This ground pole 7
Is a hollow tube having a large number of injection holes 10 formed in its peripheral wall, and the upper end side of the ground electrode 7 is connected to the discharge side of the compressor 8 via a connection hose 9. A large number of injection ports 10 formed in the ground electrode 7 are provided with a reducing agent for reducing the ground resistance value of sodium silicate, urea resin, etc., which has passed through the hollow-tube-shaped ground electrode 7 due to the pressure of the compressor 8. It is possible to squirt from. 60 liters when the grounding electrode 7 is 3 meters long,
When the grounding electrode 7 has a length of 5 meters, 100 liters of reducing agent is prepared, and as shown in FIG. 4, silicic acid prepared from a large number of injection ports 10 formed in the grounding electrode 7 by the pressure of the compressor 8. While reducing agent such as soda or urea resin is injected into the vertical hole 6 under pressure, the filling sand 1 having a higher permeability than the red soil from the upper side of the ground electrode 7 into the vertical hole 6
1 is added, and the added sand 11 and the pressure-injecting reducing agent are mixed and gradually filled around the ground electrode 7 from the lower side of the vertical hole 6. The grounding electrode 7 was inserted by filling the sand 11 having high permeability from above the vertical hole 6 while spraying the reducing agent evenly into the vertical hole 6 from the injection port 10 of the grounding electrode 7 thus inserted. From the lower side of the vertical hole 6, a uniform reducing agent distribution portion 12 is formed so as to gradually enclose the ground electrode 7. After that, the connection hose 9 of the compressor 8 is removed, and as shown in FIG.
The lead wire 13 of mm is inserted by 5 cm for crimping connection, and the reducing agent is additionally injected into the upper portion of the ground electrode 7 so that the upper portion of the ground electrode 7 is covered with the reducing agent and the embedding of the ground electrode is completed.

FIGS. 6 to 10 show the procedure for implementing another embodiment of the method for burying a ground electrode according to the present invention. First, as shown in Fig. 6, a depth of 75 cm to 100 c
3 m to 5 m in depth by using a drilling machine 20 with a diameter of 30 cm at the center of the hole 1
Excavation is performed to a certain depth to form a vertical hole 6 having a predetermined depth in the soil. If bedrock occurs during the excavation, the boring method will be used to excavate the insufficient depth to the specified depth. In this way, when the excavation of the predetermined vertical hole 6 having a diameter of 30 cm from the depth of 3 m to 5 m in the soil 5 is completed,
As shown in FIG. 7, a mesh bag 25 having an inner volume substantially equal to the inner volume of the hole is inserted into the vertical hole 6 in an expanded state with the opening portion facing upward. Next, as shown in FIG. 8, the ground electrode 7 made of a copper tube is brought to the center position of the mesh bag 25 inserted in the vertical hole 6 so that the lower end of the ground electrode reaches near the bottom of the mesh bag 25. And connect the upper end of the ground electrode 7 to the connection hose 9
Connected to the discharge side of the compressor 8 via. This grounding electrode 7 is formed in the shape of a hollow tube having a large number of injection ports 10 formed in its peripheral wall, like the grounding electrode of FIGS. Reduction for connecting to the discharge side of the compressor 8 via a connection hose 9 and reducing the ground resistance value of sodium silicate, urea resin, etc. that has passed through the hollow-tube-shaped ground electrode 7 by the pressure of the compressor 8. A large number of injection ports 1 formed on the ground electrode 7
It is possible to squirt from 0. Ground electrode 7 length 3
A reducing agent of 60 liters in the case of meters and a grounding pole 7 of 100 liters in the case of a length of 5 meters is prepared, and as shown in FIG.
Compared to red soil in the mesh bag 25 from the upper side of the ground electrode 7 while ejecting a reducing agent such as sodium silicate or urea resin prepared from a large number of injection ports 10 formed in And then the sand 11 for filling having extremely high permeability is introduced, and the sand 11 to be introduced and the reducing agent injected under pressure are mixed, and the ground electrode is gradually fed from the lower side of the mesh bag in the mesh bag 25. Fill around 7. The mesh bag 25 is inflated by this filling material and is brought into close contact with the inside of the vertical hole 6. By filling the mesh bag 25 with sand 11 having high permeability from above the vertical hole 6 while uniformly ejecting the reducing agent from the injection port 10 of the ground electrode 7 thus inserted into the vertical hole 6, In the mesh bag 25 in which the ground electrode 7 is inserted, a uniform reducing agent distribution portion 12 is formed so as to gradually enclose the ground electrode 7 from the lower side of the mesh bag 25. After that, the connection hose 9 of the compressor 8 is removed, and as shown in FIG.
A 14 mm lead wire 13 is inserted into the ground electrode 7 by 5 cm for crimp connection, and a reducing agent is additionally injected into the upper portion of the ground electrode 7 so that the upper portion of the ground electrode 7 is covered with the reducing agent and the ground electrode is buried. To complete.

[0010]

According to the method of embedding a grounding electrode of the present invention, a reducing agent is uniformly ejected into the vertical hole from the injection port of the grounding electrode inserted in the vertical hole having a predetermined depth and diameter dug in the soil. By filling the sand with high permeability from above the vertical hole while doing so, a uniform reducing agent spreading part was formed so as to gradually wrap the ground electrode from the lower side of the vertical hole where the ground electrode was inserted. , The specified ground resistance value as a ground electrode by evenly spreading the reducer around the ground electrode inserted almost vertically in the soil so that the ground electrode can be completely covered with the reducer. Can be maintained for a long time.

Moreover, according to the method for burying a grounding electrode of the present invention, a reducing agent is uniformly ejected into the vertical hole from the injection port of the grounding electrode inserted into the vertical hole having a predetermined depth and diameter dug in the soil. By filling the sand with high permeability from above the vertical hole while doing so, a uniform reducing agent spreading part was formed so as to gradually wrap the ground electrode from the lower side of the vertical hole where the ground electrode was inserted. , A large ground electrode can be formed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an execution procedure of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing an enforcement procedure of one embodiment of the present invention.

FIG. 3 is a vertical cross-sectional side view showing an execution procedure of one embodiment of the present invention.

FIG. 4 is a vertical cross-sectional side view showing an execution procedure of one embodiment of the present invention.

FIG. 5 is a vertical cross-sectional side view showing an execution procedure of one embodiment of the present invention.

FIG. 6 is a vertical cross-sectional side view showing an execution procedure of another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional side view showing an execution procedure of another embodiment of the present invention.

FIG. 8 is a vertical cross-sectional side view showing an execution procedure of another embodiment of the present invention.

FIG. 9 is a vertical cross-sectional side view showing an execution procedure of another embodiment of the present invention.

FIG. 10 is a vertical cross-sectional side view showing an execution procedure of another embodiment of the present invention.

[Explanation of symbols]

 1 hole 2 seepage tube for guide 3 spiral screwing part 4 rotor 5 soil 6 vertical hole 7 grounding electrode 8 compressor 9 connecting hose 10 injection port 11 sand 12 reducing agent distribution part 13 lead wire 20 excavator 25 mesh bag

Claims (2)

[Claims] 1. A vertical hole (6) having a predetermined depth and diameter in the soil.
A hollow tube-shaped grounding electrode (7) having a large number of injection ports (10) formed in its peripheral wall is inserted into this vertical hole, and the upper end side of the grounding electrode is compressed by a compressor ( 8)
Connected to the upper part of the grounding electrode while injecting a reducing agent for reducing the grounding resistance value such as sodium silicate or urea resin into the vertical hole from a large number of injection ports formed in the grounding electrode by the pressure of the compressor. From the side, a highly penetrative filling sand (11) is introduced into the vertical hole, and the injected sand and the pressure-injecting reducing agent are mixed and gradually filled around the ground electrode from the lower side of the vertical hole. A method of burying a ground electrode, which is characterized in that 2. A vertical hole (6) having a predetermined depth and diameter in the soil.
A mesh bag (25) having an inner volume substantially equal to the inner volume of the vertical hole in an expanded state is inserted into the vertical hole, and a large number of injection ports (10) are provided at the center of the inserted mesh bag. A hollow tube-shaped grounding electrode (7) perforated in the ground electrode is inserted, the upper end side of the grounding electrode is connected to a compressor (8) via a hose, and a large number of grounding electrodes formed by the pressure of the compressor are connected. A filler for reducing the ground resistance value such as sodium silicate and urea resin is injected into the vertical hole from the injection port while pressure is injected into the mesh bag from the upper side of the ground electrode. ) Is added, and the added sand and the pressure-injecting reducing agent are mixed and gradually filled around the grounding electrode from the lower side of the bag in the mesh bag. How to bury the ground electrode.