JPH089165Y2 - Electrode corrosion prevention device electrode mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electrode mounting device for an electrolytic corrosion preventing device,
More specifically, the present invention relates to an electrode attachment device for preventing electrolytic corrosion of gas pipes, oil transportation pipes, water pipes, cable pipes containing communication cables, etc. buried underground.

[Conventional technology]

Iron pipes buried underground, such as gas pipes, oil transport pipes, water pipes, and cable pipes containing telecommunication cables, have weak water if they are in contact with moisture in the soil for many years. Since it is also an electrolytic solution, an ionization phenomenon occurs although it is an extremely small amount.

Most of the buried pipes are made of iron, and iron (Fe) is hydrogen (H ₂ ).
Iron ion (Fe ++) due to the greater ionization tendency
Will be dissolved in water.

At this time, if oxygen is present in the water, it becomes iron, so-called red rust (Fe ₂ O ₃ · H ₂ O), and corrodes the buried pipe.

This is what is called contact corrosion due to ionization of metal, but there is electrical corrosion that occurs when an electric current flows into the iron pipe from the outside and it escapes to the outside in a place with low resistance such as water in the soil. This electro-corrosion, or so-called electro-corrosion, occurs where electric current escapes, and when there is a buried pipe installed close to a single-line overhead train line, the electric current that should return via the track leaks from the seam of the track. One of the causes is passing through an iron pipe.

To prevent the former of the two factors that corrode the buried pipe, apply an anticorrosive paint for breaking the contact state to the buried pipe,
To prevent the latter, form an electrically insulating layer on the surface of the buried pipe,
It is known to cut off the current from the outside.

Recently, it has also been proposed to connect an electric current flowing through the buried pipe to an electrode having a greater ionization tendency than that of the buried pipe to prevent electrolytic corrosion by utilizing an anode current.

For example, as shown in FIGS. 5 and 6,
A magnesium electrode 2 and a lead wire 3 are attached to a target tube 1 to be anticorrosive.
The electric connection is made by the following method. The road surface Rd is drilled a working hole H having a length of at least 1 m × a width of 1 m or more and a depth of 1 m or more, and the electrode 2 and the lead wire 3 are housed in the earth hollow, then the lead wire Three
The end portion of is welded to the target pipe 1 by thermite.

As a concrete precedent of this type of anticorrosion method, Japanese Patent Laid-Open No.
No. 60-36680 can be mentioned.

[Problems to be solved by the device]

In the above-mentioned anticorrosion work, it is necessary to excavate the road surface before the anticorrosion work, and if the road to perform the work is a main road, if the excavation area is large, the traffic control of the vehicle will be obliged and the vehicle will be extended for a long time. It not only hinders the smooth passage of traffic, but also poses a problem that workers are also at risk.

Therefore, this invention has a very short working time and does not need to perform a wide range of excavation work on the road.
It is an object of the present invention to provide an electrode attachment device that can easily attach an anode electrode to an electrolytic corrosion prevention target tube.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention attaches a fixture 20 in which an anode electrode 11 having a standard electrode potential lower than that of iron is connected to an existing buried pipe 10 made of iron, and the existing buried pipe 10 is attached.
In the electrolytic corrosion prevention device for preventing the electrolytic corrosion, the fixture 20 is formed of an elastic material and is supported by a support base 28 having an operating rod 29 that is operated from above, and the existing buried pipe 10 is moved from below to above. Clamp with a shape that can be held
21 and the engaging portions 21B, 21 formed at both ends of the clamp 21.
B, which is also made of an elastic material, engages the engaging portions 21a, 21a formed at both ends from above the existing buried pipe 10 to enclose the existing buried pipe 10 together with the clamp 21 and to provide it at the top. And a crowned portion 22 having a housing portion 23 of the bolt 24, the existing embedded pipe 10 introduced into the inside from the open end of the clamp 21, the elasticity of the engaging portion 21B, 21B and the engaging portion 21a, 21a. , The crowned portion 22 is fitted to wrap the existing buried pipe 10, and the bolt 24 is rotated to electrically connect the fixture 20 and the existing buried pipe 10. It is what

[Action]

A work hole with a small diameter that does not require full-scale restoration of the road surface pavement is formed on the road, and the fixture for the end of the lead wire is inserted together with the anode electrode from this work hole toward the target pipe. Fix the fitting to the existing buried pipe without welding from the opening of the work hole in.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings. First, in these drawings, reference numeral 10 indicates an existing pipe that is buried underground and is to be subjected to electrolytic corrosion. The existing pipe 10 has a diameter of approximately 4 to 5 cm. A working hole H having a diameter of about 11 cm is drilled in Rd in an orthogonal state toward the existing pipe 10. The distance between the working holes H is approximately 20 m, and excavation is performed to a position deeper than the existing pipe 10.

As shown in FIGS. 3 (A) and 3 (B), the excavation work of the work hole H is performed by injecting a high-pressure fluid from the compressor or water pump 15 from the tip of the thin tube 16 to break down the earth and sand under the road surface Rd. After that, the suction device 30 such as a vacuum pump is used to suck and discharge the earth and sand in the work hole H through the pipe 31, and the work hole H is continuously intersected with the work hole H as shown in FIG. The electrode receiving hole h is formed by excavation.

When the existing pipe 10 in the electrode housing hole h is made of iron, the electrode 11 made of a material having a standard electrode potential lower than that of iron, for example, magnesium (Mg) is housed and the lead wire 12 connected in advance to the electrode 11 is used. The fixture 20 to which the other end is connected is housed in the working hole H.

As shown in FIG. 4, this fixture 20 is substantially circular and has an opening end 21A formed at the upper end and engaging portions 21B, 21B formed at both ends of the opening end 21A and is formed of an elastic material. And a corrugated portion 22 that has the engaging portions 22a and 22a that fit into the engaging portions 21B and 21B from above the clamp 21, that is, from above the existing pipe 10, and that holds the existing pipe 10. I have This crown
A box-shaped accommodating portion 23 is formed on the top of 22 to project outward, and a bolt 24 is arranged in the accommodating portion 23 so as to penetrate through the top, and the bolt 24 is provided on the upper portion of the accommodating portion 23. It is screwed into the female screw portion 25.

An elastic ring 26 made of sponge containing butyl rubber is arranged at the tip of the bolt 24, and by rotating the bolt 24 from the outside, the tip of the bolt 24 comes into contact with the existing buried pipe 10 and slightly. By biting and electrically conducting, the bite damage is protected and protected by butyl rubber.

Next, the work using the electrode mounting device according to the present invention will be described.

In this fixture 20, first, the clamp 21 is placed on a support base 28 provided with a magnet (permanent magnet or solenoid magnet) 27 as shown in FIG. The table 28 is positioned below the existing pipe 10 by the operating rod 29, the open end 21A of the clamp 21 is applied to the existing buried pipe 10, and the clamp 21 is opened by pushing it up, and the existing pipe 10 is held. The crowned portion 22 is held by an appropriate means to approach the clamp 21 from above the existing pipe 10, and the engaging portion 22
The A and 22A are engaged with the engaging portions 21B and 21B of the clamp 21. Then, the bolt 25 is rotated from the ground by the box wrench R so that the tip of the bolt 25 is bitten into the existing pipe 10, and the fixture is attached.
20 and the existing pipe 10 are electrically connected.

At the contact portion between the existing buried pipe 10 and the fixture 20, a coating layer is applied to the outer periphery of the pipe to prevent corrosion and rust.
The bite scratches on the existing pipe 10 due to 24 are protected and protected by butyl rubber.

[Effect of device]

As is clear from the above description, according to the mounting device of the present invention, the clamp 21 is mounted on the support base 28 having the operating rod 29.
Is pushed up from the lower side of the existing buried pipe 10 to elastically hold it, and the engaging portions 21B, 21B provided at the open end of the clamp 21
In addition, the engaging portions 21a, 21a of the crowned portion 22 from above the existing buried pipe 10
, And the bolt 24 attached to the crowned portion 22 is tightened to electrically connect with the existing buried pipe 10, so that the shape is small and the work hole to be excavated may be small. Since the existing buried pipe 10 is reliably and firmly captured by the clamp 21 and the crowned portion 22, it is possible to withstand vibrations of other constructions that are performed at the same time, and there is an effect that it has little influence on traffic etc. .

[Brief description of drawings]

FIG. 1 is a sectional view of a road to which the electrode mounting device of the present invention is applied, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a sectional explanatory view showing excavation work, and FIG. 4 is FIG. 5 is a front view showing a state in which the fixture is attached to an existing pipe, FIG. 5 is a plan view of a road surface for explaining a conventional construction method, and FIG. 6 is a sectional view taken along line XX of FIG. 20 …… Mounting fixture, 21 …… Clamp, 22 …… Covered part, 21A
…… Opening end, 23 …… Accommodation part, 24 …… Bolt, 25 …… Female screw part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toshio Nakagawa Creator, Tokio Nakagawa, 3-18 Daikan, Yamato-shi, Kanagawa Four-share company, Hakko Development Technology Research Institute (56) Bibliography 52-34997, JP Actual development Sho 62-170478 (JP, U) Actual public Sho 57-13888 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A fixture (20) in which an existing buried pipe (10) made of iron is connected to an anode electrode (11) having a standard electrode potential lower than that of iron.
In the electrolytic corrosion prevention device for preventing electric erosion of the existing buried pipe (10) by mounting the mounting tool (20), the mounting tool (20) is made of an elastic material, and has a support base (29) having an operating rod (29) for operating from above. 28), a clamp (21) having a shape capable of holding the existing buried pipe (10) from below to above, and engaging portions (21B, 21B) formed at both ends of the clamp (21), Similarly, the engaging part (21a, 21a) formed from both ends of the existing embedded pipe (10) from above the existing embedded pipe is engaged to hold the existing embedded pipe (10) together with the clamp (21), And the bolt (2
4) a crowned part (22) having a housing part (23), and the existing embedded pipe (10) introduced into the inside from the open end of the clamp (21) is engaged with the engaging parts (21B, 21B). ) And the engaging part (2
1a, 21a) is elastically captured, the crowned portion (22) is fitted to wrap the existing buried pipe (10), and the bolt (24) is rotated to fix the fixture (20) and the existing buried pipe (10). 10) An electrode mounting device for an electrolytic corrosion prevention device, characterized in that it is electrically connected to and.