JP2002313511A - Ground electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a bare wire as an electrode is directly contacted with a core wire of an insulated wire and thereby intrusion of ground water into the insulated wire cannot be prevented perfectly in a conventional ground electrode. SOLUTION: An end of the bare wire is connected to an end of the core wire formed on a tip of the insulated wire and having no insulating cover through a sleeve, and an insulating tape is wound around the end of the insulating cover and the sleeve. The end of the core wire is inserted into a non-through hole formed on an end of the sleeve and the end of the sleeve is inserted into a non-through hole formed on the other end of the sleeve so that the end of the core wire and the end of the bare wire is completely shut off watertightly by a thick part of the sleeve. The insulating tape is wound around the end of the insulating cover and the sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding method in which an insulated wire from which an insulating coating at a tip is removed is buried in a drilling hole to ground a ground electrode to a specific depth except for a certain depth from the ground surface. Electrodes.

[0002]

2. Description of the Related Art In order to insulate the ground portion of a contact electrode and to ground only a portion at a specific depth, a predetermined length of insulation coating at the tip of an insulated wire is removed to expose a core wire.
Japanese Patent Application Laid-Open No. H10-55868 discloses a method of burying a ground electrode by injecting a filler into and burying the insulated wire while inserting and holding the insulated wire at a specific depth of the borehole.

FIG. 2 is an explanatory view of such a conventional example.
In the figure, reference numeral 1 denotes a drill hole, in which an insulated wire 2 is provided.
Are inserted and buried as electrode materials. The insulated wire 2
Before insertion into the borehole 1, the insulating coating 3 at the tip is stripped to expose the core wire 4, and a bare wire 7 is connected to the tip of the core wire 4 via a copper compression sleeve 5 to compress the core. With the sleeve 5 substantially in contact with the insulating coating 3, the compression sleeve 5 is compressed using a compression tool (not shown) and fixed to the core wire 4 and the bare electric wire 7. Thereby, the gap remaining in the core wire 4 and the bare wire is substantially compressed and disappears.

[0004] Next, in order to increase the waterproofness of the connection between the core wire 4 and the bare wire 7, a compression-type sleeve 8 is further attached to the bare wire 7 below the compression-type straight sleeve 5 and compressed. Between the upper portion of the compressed sleeve 8 and the insulating coating 3
After the application of the water-impermeable resin, the insulating tape 6 is wrapped around to cover the contact portions of the both and completely seal them.

As a result, the core wire 4 and the bare wire 7 of the insulated wire 2 are separated from the outer insulating coating 3 in terms of fluid movement. Here, the portion of the bare electric wire 7 is folded in two, inserted into the excavation hole 1, and held so that the compression-type sleeve 5 is located at a position of a substantially predetermined insulation depth L1.
A filler is injected into the borehole 1.

[0006]

However, in the above-described ground electrode, the bare wire serving as the electrode and the core wire of the insulated wire are in direct contact with each other. There was a drawback that it was not possible to completely prevent infiltration of groundwater into the insulated wire when it fluctuated.

The present invention has been made to eliminate the above disadvantages.

[0008]

According to the present invention, there is provided an installation electrode in which an insulated wire and a core portion having no insulating coating formed at the end thereof are connected to one end of the core via a sleeve. A non-through hole for inserting an end of the core wire, and a non-through hole for inserting one end of the bare wire. And a hole.

[0009]

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

FIG. 1 shows an embodiment of the present invention. The same parts as those in FIG.

In the present invention, the bare wire 7 having no insulating coating 3 formed on the tip of the insulated wire 2 is attached to the end of the bare wire 7.
Is connected via a sleeve 9, and an insulating tape 6 is wound around the end of the insulating coating 3 and the sleeve 9. In addition, one end of the core wire 4 is inserted into a non-through hole 10 formed at one end of the sleeve 9, and one end of the bare electric wire 7 is inserted into a non-through hole 11 formed at the other end of the sleeve 9. A thick portion 12 of the sleeve 9 is formed between the end of the core wire 4 and the end of the bare wire 7.
Completely watertight.

After applying a water-impermeable resin material between the end of the insulating coating 3 and the sleeve 9, the insulating tape 6 is wrapped to completely seal the contact portion between the insulating coating 3 and the sleeve 9. Let me know.

[0013]

Since the ground electrode of the present invention has the above-described structure, there is a great advantage that the infiltration of the groundwater into the core wire 4 is surely blocked and the life is greatly extended.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling hole 2 Insulated wire 3 Insulation coating 4 Core wire 5 Compression type sleeve 6 Insulation tape 7 Bare wire 8 Compression type sleeve 9 Sleeve 10 Non-through hole 11 Non-through hole 12 Thick part

Claims (1)

[Claims] 1. An insulated wire and a core portion having no insulating coating formed at the tip thereof, a bare wire having one end connected to an end of the core via a sleeve, and an end of the insulating coating. And an insulating tape wound around the sleeve,
A non-through hole in which the sleeve inserts the end of the core wire,
A ground electrode comprising a non-through hole into which one end of the bare electric wire is inserted.