JPS5912580A - Method of reducing ground resistance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounding device installed on, for example, a telephone pole, that is, a grounding device.

In order to maintain the grounding effect of a grounding device installed on a utility pole, etc., the grounding resistance must be kept below a certain value. This grounding resistance is the electrical resistance value between the grounding rod buried underground and the ground, but if the resistance value between this exceeds the permissible range, excavate the ground where the grounding pole is buried and use the grounding rod. The area must be exposed, a liquid ground resistance reducing agent must be sprayed around the area, and the area must be backfilled.

However, the grounding rods are buried at a depth of approximately 75ah or more from the ground, and multiple grounding rods are placed in a certain area, so it requires a great deal of effort to excavate the ground to reach them. and is paved with asphalt etc.-C
Work in urban areas requires a variety of excavating machines, and there are constant complaints about noise and other issues. There are also aesthetic issues, and there are various problems such as the risk of breaking water pipes and gas pipes during construction.

The object of the present invention is to provide a construction method for reducing ground resistance without excavating the ground, in order to solve the drawbacks of the conventional methods as described above.

That is, this invention penetrates an injection pipe having a large number of injection holes at an appropriate depth from the ground toward a grounding rod buried underground, and uses a pump connected to this injection pipe to inject liquid ground resistance. By press-fitting the reducing agent,
Is it possible to reduce ground resistance without excavating the ground by dispersing the ground resistance reducing agent into the ground near the buried ground rod through a large number of injection holes provided in the injection pipe? An explanation will be given based on an embodiment shown in the accompanying drawings.

In FIG. 1, -C11 is a utility pole, 2 is a grounding wire attached to this utility pole, and 3 is the ground. A plurality of grounding rods 4 are buried in the ground 5 and are connected to the grounding wire 2.

7 is an injection pipe, which has a large number of injection holes 8 as shown in FIG.
If the lower end 6 is formed into a conical shape, it will be easier to penetrate into the ground, but since the injection pipe is relatively thin, it is not necessary to do so.

9 is a pump installed on the ground, manual or engine type,
Use a power-driven type such as an electric motor that is suitable for the site conditions. The discharge port of this pump 9 is connected to the rear end of the injection pipe γ by a hose 10, and between the ends of a hose 11 connected to the suction port of the pump 9.

The opening is placed in a container 13 containing a ground resistance reducing agent 12.

As this ground resistance reducing agent, for example, Athlon WIO (trademark of Sanyo Kokusaku Pulp Co., Ltd.) or Chemie Earth (trademark of Mitsui Toatsu Co., Ltd.) may be used, or since Athlon WIO is a powder, it may be mixed with water to form a liquid and used -C. Chemie Earth is l
Since it is deformed, use it as it is or dilute it with water as appropriate.In addition, it is extremely easy to penetrate the injection pipe 7 into the ground because the pipe diameter is small, but it is necessary to use a crowbar or the like in advance to penetrate the ground into the ground. If a hole is drilled and then penetrated, it can easily penetrate even relatively hard ground. In this way, the injection tube 7 is extended from about 60 cm to 1
After penetrating the ground to a depth of approximately 1,000 cm and injecting the ground resistance reducing agent into the ground at a maximum pressure of approximately 15 K9/ctR, the resistance of the barrier was measured using a conventional method using a measuring terminal 14 installed on a telephone pole, and the resistance was approximately 220 Ω before injection. The resistance of some of the parts had dropped to about 20Ω.

In addition, when we investigated the permeation range of the L-r ground resistance reducing agent by digging into the ground after injection, we found that it had sufficiently diffused and penetrated into the area of the ground rod 4, as shown by the chain line a in Figure 1. Ivy.

As mentioned above, this invention reduces the ground resistance reduction work by 3 workers, which took about 3 hours compared to the conventional method ゛C using excavation.
This is a significant reduction in work time, taking about 20 minutes for a person.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the method of the present invention, and FIG. 2 is a partially cutaway enlarged longitudinal front view showing an example of an injection tube. 1... Telephone pole, 2... Ground wire, 3... Ground, 4...
・Ground rod, 7... Injection pipe, 8... Injection hole, 9...
Pump Special 3'); Applicant: Koji Sumitomo

Claims (1)

[Claims] In grounding devices installed on utility poles, etc., an injection pipe with multiple injection holes is inserted at an appropriate depth from the ground toward the grounding rod buried underground, and a pump connected to this injection pipe is used to reduce ground resistance in liquid form. A method for reducing ground resistance, characterized by dispersing and permeating the ground resistance reducing agent into the ground near the buried part of the grounding rod through a large number of injection holes provided in an injection pipe by press-injecting the agent.