JPS6016715B2 - How to form a pseudo-ground electrode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a pseudo-grounding electrode related to grounding technology for telecommunications equipment or lightning rods, etc., and is capable of reliably exhibiting the effect of reducing saddle ground resistance of a reducing agent, and of reducing the resistance. The aim is to provide a new method for long-term maintenance.

In general, when the desired low grounding resistance cannot be obtained by simply grounding a metal electrode, such as a copper wire,
It is already well known that ground resistance can be significantly reduced by supplementary use of a reducing agent containing a large amount of fin-promoting components.

The reducing agent is generally made of a powder or a concentrated undiluted solution, and when using it, it is first mixed with a certain amount of water to form a solution, and then added to the soil where the metal electrode is installed. When pouring, a sufficient gap must be provided between the metal electrode and the soil so that the reducing agent solution stays uniformly on the circumferential surface of the metal electrode.

In view of the above, the conventional method is to drive a rod-shaped tool with a diameter larger than the diameter of the metal electrode by approximately the same length as the metal electrode and pull it out. After inserting it, the reducing agent 10 solution is poured in.

In this case, part of the solution of the reducing agent 10 permeates into the soil, and the entire amount solidifies over a certain period of time, forming the so-called pseudo-ground electrode A' containing the metal electrode 9, as shown in FIG. Due to the effect of the dew-promoting component contained in the reducing agent 10, a high grounding effect equivalent to the case where a metal electrode with the same large diameter as the pseudo-ground electrode A' is installed can be obtained. The grounding treatment method of forming a pseudo-grounding electrode using a reducing agent has been widely used in many places because it can be constructed at an extremely economical cost without consuming large amounts of expensive metal materials. Serious drawbacks were also pointed out in soils with poor viscosity, such as sandy soils and sandy soils.

In other words, in the cavity created in the above-mentioned bush, the collapse of the internal soil is suppressed, and the soil-reducing agent solution poured into the cavity is easily contaminated with earth and sand, significantly impairing the normal formation of the pseudo-ground electrode. It hinders it.

A pseudo-ground electrode formed in such an abnormal state not only has a highly uneven shape, but also has an extremely uneven shape, which is equivalent to, for example, mixing several times the specified amount of sand and gravel necessary for mixing concrete. It turns into a coarse solidified body, and after that it becomes sensitive to the washing action of infiltrating rainwater and groundwater, and its volume shrinks in a short period of time, resulting in drastic fluctuations in ground resistance. be. The present invention was devised in view of the above-mentioned drawbacks of the conventional methods, and it is possible to reliably and easily form a normal pseudo-ground electrode in which the entire length of the metal electrode is coated with a reducing agent with a uniform thickness. The ground resistance reducing effect of the reducing agent is fully exhibited, and the reducing effect is further improved and maintained for a long period of time.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an aluminum perforated pipe 1 having a large number of water permeable holes 2 along its entire length, and a mirror 3 having a diameter larger than the diameter of the perforated pipe 1 at the tip of the perforated pipe 1. is crimped with iron.

FIG. 2 shows the driving state of the perforated pipe 1. While striking the rear end of the driving rod 4 which is inserted into the perforated pipe 1 and whose tip is in contact with the upper end of the bell 3, The perforated pipe 1 is driven into the soil, but since the bell 3 at the tip has a larger diameter than the perforated pipe 1, a gap 6 is created around the perforated pipe 1 during installation. It is 4 because it is.

After removing the driving thread 4 from the perforated pipe 1, as shown in FIG. 3, an electrode 5 made of a steel rod is inserted and a solution of the reducing agent 7 is poured into the pipe. Through the hole 2, the material in the perforated tube 1 and the material in the gap 6 are solidified while being integrated, forming a pseudo-ground electrode A containing the perforated aluminum tube 1 and the electrode 5. As mentioned above, in the conventional method, it was difficult to reliably form a pseudo-ground electrode in soil with poor viscosity because no effective means could be taken to protect the created cavity from internal soil collapse. In contrast, in the present invention, as described above, the volume for pouring the reducing agent 7 solution is ensured by the perforated pipe 1, and it is also effective against the situation where the surrounding gap 6 is partially buried by collapsing earth and sand. Water permeable hole 2 provided in substantially the entire length of the hole pipe 1
Since the solution leaking from the tube permeates sufficiently, its effectiveness is not significantly reduced.

A further noteworthy feature of the present invention is that it is composed of two types of metals with different potential differences.

In contrast to the copper rod used as the electrode 5, the material of the perforated tube 1 is aluminum, which has a lower potential than copper and is more ionizable, and both are electrically conductive via the reducing agent 7. Problem of dissimilar metals accompanied by corrosion action. As a result, aluminum, which is a base metal compared to copper, oxidizes in a short period of time as a result of natural corrosion. However, since this aluminum oxide is a powdered insulator, there are doubts about the reduction effect as it is contained in a solidifying reducing agent as a single substance, but the present invention has been developed by using aluminum oxide. On the contrary, it can be used as an effective reducing agent to cause secondary reaction and coagulation to further improve the reducing effect, and the details will be explained below.

The reducing agent used in the present invention is made by adding water to the above three agents, aluminum oxide, calcium oxide, and calcium sulfate, and making a suspension. After about 10 minutes, the entire amount reacts with the immortal coagulant, and the contents are as follows. That is, mountain 2030Ca○1CaS04n ratio 0→father a0・Al203・father aS04・32LO or father a0・AI2031CaS04・1 illusion 20, and the ettringite produced by this reaction is a needle-like crystal. They aggregate to form a reduction-reducing aggregate with excellent water envelopment and electrical conductivity.

However, the aluminum perforated tube 1, whose entire circumference is surrounded by the ettringite, soon erodes due to the potential difference with the copper electrode and turns into aluminum oxide inside the ettringite. However, since it has sufficient residual power to react with aluminum oxide, secondary ettringite is generated, which replenishes the primary ettringite and improves the reduction effect. A new method will be established in which this will be done. For the above reasons, the aluminum perforated pipe 1 according to the present invention exhibits an extremely effective reduction effect in reducing the amount of aluminum oxide that causes corrosion.

[Brief explanation of the drawing]

The drawings relate to a method of forming a pseudo-ground electrode according to the present invention, and FIG. 1 is a side view showing a perforated tube 1, and FIGS. 2 to 4 are longitudinal sectional views relating to the implementation of the present invention. FIG. 5 and FIG. 6 are explanatory diagrams regarding the subordinate method. 1
~ Perforated pipe, 1' ~ Aluminum hydroxide, 2 ~ Water permeable hole, 3
~ Rust, 4 ~ Drilling twill, 5 ~ Electrode, 6 ~ Gap, 7 ~ Reducing agent, 8 ~ Cavity, 9 ~ Metal electrode, 10 ~ Reducing agent, A, A' ~
Pseudo-ground electrode. 〆Zu Neszu neta zu 〆zu 〆zu 〆zuzai 〆zu

Claims (1)

[Claims] 1 A A harpoon 3 having a diameter larger than the outer diameter of the perforated pipe 1 is attached to the tip of an aluminum perforated pipe 1 having a large number of water permeable holes 2 along its entire length.
B. Driving the perforated pipe 1 into the ground while pressing and removing the soil with the peripheral edge of the harpoon 3 to create a gap 6 on the circumferential surface, and C. Driving the perforated pipe 1 into the ground between the front and back. An electrode 5 made of copper, a metal with a lower ionization tendency, is inserted into the perforated pipe 1 at a higher potential than aluminum, and a reducing agent 7 solution is inserted into the perforated pipe 1 into which the electrode 5 is inserted. At the same time, the gap 6 around the perforated pipe 1 is filled with the reducing agent solution that leaks out through the water permeable hole 2, and the reducing agent that solidifies after a predetermined period of time fills the inside. After forming a pseudo-grounding electrode A that includes the electrode 5 and the perforated pipe 1 and is in complete contact with the surrounding soil, the electrode 5 and the perforated pipe 1 are electrically connected by the reducing agent 7. Due to the electrolytic corrosion effect of the current flowing naturally between dissimilar metals, the voltage applied to the electrode 5 is lowered and the perforated tube 1, which has a strong tendency to ionize, is changed to aluminum oxide, thereby making it newly conductive. A method for forming a pseudo-ground electrode, characterized in that a material is prepared and replenished.