JP2717207B2 - Ground electrode - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ground electrode which is easy to install and has a long life.

(Prior Art) Conventionally, a copper-coated steel rod has been used as an electrode for grounding. This electrode has a steel rod at the center and is excellent in rigidity and strength, so that the driving workability is good. In addition, since the surface layer is copper and has excellent corrosion resistance in the ground, it usually has a sufficient life.

(Problems to be Solved by the Invention) However, when the ground current is large, the electrode is consumed in a relatively short time due to electrolytic corrosion, and the function as a ground electrode is lost. For this reason, carbon electrodes, high-silicon cast iron electrodes, etc. have been developed and used as electrodes resistant to electrolytic corrosion. It is rare. For this purpose, an electrode coated with platinum on the surface has been developed to ensure a sufficient corrosion life. However, platinum is extremely expensive and requires a thin coating thickness, so great care must be taken during construction to avoid damage to the coating. For this reason, installation by driving is impossible, and improvement of workability has been desired.

The present invention has been proposed to improve the above-mentioned drawbacks, and an object of the present invention is to provide a ground electrode having a long life and excellent installation workability.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a carbon steel, and then platinum or an alloy layer thereof sequentially from the outer surface toward the center,
Then, a ground electrode characterized by being made of a conductive material and then of carbon steel is the gist of the invention.

In the conventional ground electrode, the surface layer is made of copper with excellent corrosion resistance,
Although there was the idea of combining materials such as steel with excellent mechanical properties at the center, focusing only on the electrode surface, a material that is excellent in corrosion resistance but soft, or hard but has a long corrosion life. Made with either short material. The inventors obtained an idea that if the durability at the time of installation and the long-term durability were assigned to different materials, it was possible to realize a ground electrode excellent in both the workability of the installation and the corrosion life, and studied. . As a result, it was concluded that the material of the outermost layer could easily be lost in the ground as long as it could withstand damage during installation, and the present invention was reached.

The present invention is characterized in that the surface of a long-life platinum-coated ground electrode is protected by a metal layer in order to improve the installation workability. This is different from a high-silicon cast iron ground electrode which has excellent properties but is unsatisfactory in terms of life.

(Operation) Since the present invention is configured as described above, it is not damaged during installation, the installation workability is remarkably improved, and the corrosion resistance is excellent.

(Example) Next, an example of the present invention will be described.

It should be noted that the embodiment is merely an example, and various changes and improvements can be made without departing from the spirit of the present invention.

FIG. 1 shows a cross section of an embodiment of the present invention. In the drawing, reference numerals 1 and 4 denote carbon steel, 2 denotes copper, and 3 denotes platinum. With this structure, the carbon steel 1 at the center has the purpose of securing the rigidity and strength of the electrode itself and at the same time reducing the use of relatively expensive copper material.
The outer carbon steel 4 aims to protect the platinum coating 3. The platinum coating 3 is a portion that forms an electrode surface when the outer layer of carbon steel functions as a ground electrode for a long time after being corroded and consumed in the ground. The copper layer 2 is inserted to reduce the electric resistance of the electrode itself and to serve as a base for forming the platinum coating 3. Although the dimensions are not specified in this embodiment, for example, center carbon steel Material: S45C Diameter: φ10mm Copper layer Material: Oxygen-free copper layer Thickness: 1mm Platinum coating Material: 3N platinum Coating layer: 0.01mm Outer carbon steel material : S45C Layer Thickness: When 1mm, the specifications of the 1m long electrode are as follows.
A ground electrode with excellent installation workability and long life can be realized.
The life expectancy is 1.8A power supply.

Surface strength: No damage reaching the platinum layer when driven into soil Flexural rigidity: 35kgf ・ m ² Allowable bending moment: 4.3kgf ・ m Weight: 1.25kg Electric resistance: 360μΩ Life: Semi-permanent life (However, carbon In this example, copper-coated carbon steel was used as the lower layer of platinum. However, this example satisfies the requirements of rigidity, strength, and electrical resistance of the electrode itself, and has sufficient electrical conductivity with platinum on the surface layer. Anything that gives you the bond, requirements, price,
An optimum material or a combination of materials may be selected in consideration of ease of production. For example, the lower layer of platinum may be made of only carbon steel. In this case, there is an advantage that the manufacturing cost can be reduced. In this embodiment, carbon steel is used for the outer layer. However, basically any metal that has sufficient strength to protect the platinum layer at the time of construction and sufficient electrical coupling with the platinum layer can be obtained. May be. However, since it becomes the outermost layer of the electrode until corrosion is consumed after grounding, a metal that forms a corrosion product with high electric resistance on the surface is not suitable. It is clear that the same effect can be obtained by forming a similar ground electrode using a platinum alloy, a white metal, or an alloy thereof instead of platinum.

(Effect of the Invention) As described above, the ground electrode according to the present invention is protected from the long-life platinum layer by the outermost carbon steel, so that it is not damaged at the time of installation, and the installation workability is significantly improved. In addition, even when used for a long time, the platinum surface having excellent corrosion resistance has a long service life, and thus has an effect that it can be used semipermanently.

[Brief description of the drawings]

 FIG. 1 shows a sectional view of a ground rod according to the present invention. 1 ... Carbon steel, 2 ... Copper, 3 ... Platinum, 4 ... Carbon steel

Claims (1)

(57) [Claims] 1. A ground electrode comprising a carbon steel, a platinum or its alloy layer, a conductive material, and a carbon steel in order from the outer surface toward the center.