JP2535740Y2 - External power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in an electrode device used when a structure or an underground object is subjected to electrolytic protection by an external power supply system.

[Summary of Invention] The present invention is intended to reliably prevent water from entering the electrode-wire connection portion in the electrode device.

[Related Art] Conventionally, in order to prevent gas buried pipes and petroleum buried pipes for transporting dangerous substances from being corroded by soil, cathodic protection using an external power supply method has been widely applied.

Especially in places where various buried pipes are buried close to each other, such as in an urban area, it is necessary to avoid interference with other buried pipes due to the current flowing out of the cathodic protection electrode (hereinafter referred to as the electrode). Therefore, a deep well type electrode system in which the electrode is buried deep underground (50 to 150 m) is employed.

Electrode devices shown in FIGS. 4 and 5 are often used as the anticorrosion means by the external power supply method.

That is, in the figure, 1 is an electrode material serving as an electrode, 2 is a protective cap, 3 is a wire sheath, 4 is a wire insulating layer, 5 is a core wire, 6 is a core-electrode connection portion, and 7 is fitted around the outer periphery of the wire. The inserted heat-shrinkable tube, 8 is a synthetic resin material filled in the protective cap, and 9 is a cable lead-in packing.

[Problem to be Solved by the Invention] In the electrode device having the above configuration, the core wire-electrode connecting portion 6
If water enters, corrosion and poor contact will occur, leading to a decrease in electrode function.

When the electrodes are to be buried in a relatively shallow place in the ground, as shown in FIG. 4, the protection cap 2 is covered, and the resin 8 is filled so as to surround the connection portions 6, so that the electrodes can be used for a long time. Can be

However, when buried in a high pressure environment in a deep well type, water intrusion is observed. As a water intrusion path, there is a path along the surface of the electric wire sheath 3 to reach the core wire 5 via the insulating layer 4. Further, since the wire sheath and the insulating layer have a gas permeability coefficient specific to the material, when many months pass under a high-pressure environment, moisture penetrates into the core wire 5 and passes through the gap of the stranded wire to the connection portion 6. Water seeps in. In order to prevent this, means for preventing water from entering by using the heat-shrinkable tube 7 shown in FIG. 4 or the cable lead-in packing 9 shown in FIG. 5 is applied.

However, when the cable lead-in packing shown in FIG. 5 is used, infiltration of water through the surface of the electric wire is prevented, but it is impossible to prevent water entering through the core wire.

[Purpose of the Invention] The present invention has been made to solve the above-described problem, and completely blocks both water passing through the surface of the electric wire and water passing through the inside of the core wire, thereby connecting the electric wire and the electrode. It is an object of the present invention to provide an external power supply cathodic protection electrode device capable of reliably preventing water from entering a part.

Means for Solving the Problems In order to achieve the above object, the present invention provides an electrode device for external power supply cathodic protection, in which a protective cap is placed over a connection portion between an electrode and an electric wire and a resin or the like is filled in the protective cap. At
The above-described problem is solved by a configuration in which a crimp terminal for deforming a core wire and eliminating a gap is fitted to an insulating layer portion or a core wire portion of the electric wire passing through the protective cap.

[Operation] In the electrode device having the above configuration, when the crimping terminal fitted to the insulating layer portion or the core wire portion of the electric wire is crimped by a crimping device, the crimping terminal is crimped to the insulating layer or the core wire without any gap, and the core wire is deformed at the same time. Since there is no gap between the twisted wires,
Both the water passing through the surface of the electric wire and the water passing through the inside of the core wire are shut off, thereby preventing water from entering the electric wire-electrode connection.

[Embodiment] Fig. 1 shows an embodiment of the present invention, and the same or similar members as those in Fig. 4 are denoted by the same reference numerals.

That is, 1 is an electrode material, which includes titanium-platinum,
A poorly soluble electrode such as ferrite or silicon iron is used. Reference numeral 2 denotes a protective cap, made of an insulating material which is not violated by gas or the like generated by an electrolytic reaction. Wire, an electric wire for deep wells formula electrodes (50 to 150 m from the electrode to the surface), for example, 14 mm ² 7 present /1.6
A Teflon-based insulating layer 4 is placed over the φ stranded wire, and further protected by a polyethylene resin sheath 3 is used. In the connection part 6, a means is used in which a screw screwed to the tip of the core wire 5 is screwed and connected to a tap screw part provided on the electrode side. As the filling resin material 8, an epoxy resin, a urethane resin, or the like is used.

Then, the insulating layer 4 of the electric wire passing through the protective cap 2
, A crimp terminal 10 is fitted thereto. This crimp terminal 10
A metal material that can be easily plastically deformed when pressed by a crimping device to clamp the electric wire, for example, a copper tube material is used.

According to the above configuration, the crimp terminal 10 is firmly adhered to the Teflon-based resin of the insulating layer 4 with no gap due to plastic deformation when pressed by the crimping device. At the same time, the core wire 5 is also pressed and deformed, and the gap between the stranded wires is eliminated. Therefore, both the water passing through the surface of the electric wire and the water passing through the inside of the core wire are cut off at the crimp terminal 10, so that water can be completely prevented from entering the electric wire connection portion 6 below the crimp terminal 10. You.

The electrode of the above example was prototyped, energized in a deep well with a depth of 80 m, pulled up one year later, and disassembled and inspected.As a result, water infiltration was observed in the wire core above the crimp terminal,
No water permeation was observed in the connection portion below the crimp terminal.

FIG. 2 shows another embodiment of the present invention, in which a crimp terminal 10 is attached to a core wire 5 of an electric wire passing through the protective cap 2.
And the stranded wire is deformed to eliminate the gap.
In this case as well, both water passing through the surface of the electric wire below the crimp terminal and water passing through the inside of the core wire are shut off, thereby preventing water from entering the connection portion.

FIG. 3 shows another embodiment of the present invention.
In this embodiment, a protective cap 2 'is separately provided at a portion of the wire away from the electrode material 1 and is filled with a resin material. The crimp terminal 10 is provided on the insulating layer 4 of the wire passing through the cap 2'. It is fitted. In this case, the same effect as described above can be obtained. In addition, when the crimp terminal and the sealing portion mainly made of resin are separately provided in the electric wire portion above the electrode as described above, the pressure difference between the electrode portion and the ground surface can be reduced.

[Effects of the Invention] As described above, according to the present invention, under high pressure in moist soil, the water passing through the surface of the electric wire and the inside of the core wire is completely shut off, and Thus, it is possible to obtain an electrode device for external power supply cathodic protection which can reliably prevent the intrusion of water and can be used for a long time.

[Brief description of the drawings]

1, 2 and 3 are longitudinal sectional views of an electrode device showing an embodiment of the present invention, respectively, and FIGS. 4 and 5 are longitudinal sectional views of a conventional electrode device. DESCRIPTION OF SYMBOLS 1 ... Electrode material, 2 ... Protective cap, 3 ... Electric sheath, 4 ... Insulating layer, 5 ... Core wire, 6 ... Connection part, 7 ...
Heat shrink tubing, 8 resin material, 9 cable packing, 10 crimp terminal.

Claims (1)

(57) [Scope of request for utility model registration] 1. An external power supply cathodic protection electrode device comprising a protective cap over a connection portion between an electrode and an electric wire and filling the protective cap with a resin or the like, wherein the insulating layer portion or the core wire portion of the electric wire passing through the protective cap is provided. And a crimp terminal for deforming a core wire to eliminate a gap.