JP2504336Y2 - 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 such as a gas pipe buried underground, a petroleum transportation pipe, a water pipe, and a cable pipe containing a communication cable.

[Conventional technology]

Steel pipes buried underground, such as gas pipes, oil transport pipes, water pipes, and cable pipes containing communication 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 ).
Since it has a larger ionization tendency, it becomes iron ions (Fe ⁺⁺ ) and elutes in water.

At this time, if oxygen is present in the water, iron becomes rust, so-called red rust (Fe ₂ O ₃ · H ₂ O), which 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 FIG. 9 and FIG. 10, the magnesium electrode 2 is electrically connected to the target tube 1 to be anticorrosion by the lead wire 3.
Electrode 2 by drilling a working hole H of 1m x width 1m or more and depth 1m or more
After accommodating the lead wire 3 in the earth hollow, the end portion of the lead wire 3 is thermite-welded to the target tube 1.

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 anticorrosion construction method as described above, it is necessary to excavate the road surface before the anticorrosion work, and if the road to be subjected to the work is a main road, if the excavation area is large, the traffic regulation of the vehicle will be obliged and the vehicle will be extended for a long time. Not only is it possible to prevent smooth traffic, but there is also the problem that workers are 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 capable of easily attaching 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 prevents the electrolytic corrosion of the existing buried pipe 10 by mounting the fixture 20 in which the anode electrode 11 having a standard electrode potential lower than that of iron is connected to the existing buried pipe 10 made of iron. In the electrolytic corrosion prevention device, the attachment 20 has a shape capable of enclosing the existing buried pipe 10, and the top is rotatably pivoted via a hinge pin 21D to the outer periphery of the box-shaped accommodating portion 22, and the anode is It is fitted between the pair of clamps 21, 21 to which the electrodes 11 are connected and the top of the female screw portion 23 provided in the housing portion 22 and the top of the housing portion 22, and slides the female screw portion 23 up and down. A push spring that is possible and restrains in the direction of rotation
24, a bolt 26 that is screwed into the female screw portion 23 from the top side of the accommodating portion 22, and a clamp opening blocking ring 25 that fits below the hinge portion on the outer circumference of both the clamps 21 and 21, By screwing the bolt 26, the tip end of the bolt 26 comes into contact with the existing buried pipe 10 to pull up the both clamps 21, 21, and both clamps 21, 21 are firmly contacted and fixed to the outer periphery of the existing buried pipe 10. Is characterized by.

[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. Operate the fixture from the opening of the work hole of to tighten and fix it to the target pipe without welding.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8 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 anticorrosion. The existing pipe 10 has a diameter of about 4 to 5 cm, and the road surface Rd is directly above the existing pipe 10. Then, a working hole H having a diameter of about 11 cm is drilled in an orthogonal state toward the existing pipe 10. The distance between the work holes H is about 20 m, and the existing pipe 10 is exposed by tensioning to a position deeper than the existing pipe 10.

As shown in FIGS. 3 (A) and 3 (B), the excavation work of the working hole H is performed by injecting a high-pressure fluid from the compressor or the water pump 30 from the tip of the thin tube 31 to break down the earth and sand under the road surface Rd. Then, the suction device 40 such as a vacuum pump is used to suck and discharge the earth and sand in the work hole H through the pipe 41, and the work hole H is continuous with the work hole H as shown in FIG. The electrode receiving hole h is formed by stretching.

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, the fixture 20 has a pair of left and right clamps 21 each having a substantially circular shape and an opening surrounding the existing pipe 10 formed at the lower end thereof. The top of the clamp 21 is box-shaped. The housing 22 is rotatably supported by a hinge pin 21D, and the top and bottom of the housing 22 are provided with window holes 22A and 22B on the same axis. The female screw portion 23 is accommodated. The push spring 24 is accommodated between the top of the female screw portion 23 and the top of the accommodating portion 22, and the female screw portion
23 is fitted so as to be slidable up and down in the accommodating portion 22 and constrained in the rotational direction, and presses the female screw portion 23.

The clamps 2 are provided on the upper outer circumference of the pair of clamps 21, 21.
A clamp opening blocking ring 25, which is inserted from above with the existing pipes 10 closed and holding the existing pipes 10 and is held from the top to prevent the clamps 21 and 21 from opening, is separately prepared.

The fixture 20 has the clamps 21 and 21 opened to open the existing pipe 10.
With the clamp opening preventing ring 25 fitted and fitted around the upper portions of the clamps 21, 21, the tip of the bolt 26 is rotated by rotating the bolt 26 with the box wrench R inserted from the working hole H. Contacts the existing pipe 10 and clamps
21,21 strongly contact the outer peripheral portion of the existing pipe 10. The clamp opening prevention ring 25 prevents the claps 21 from opening.

[Other Examples]

Further, the fixture 20 is, as shown in FIGS. 5 and 6,
Attach the top end 21B of the clamp 21 to the fixture body 27 with the hinge pin 2
1D is hinge-attached, and a tapered portion 21C is formed on the peripheral surface near the top end portion 21B so that the upper end width is smaller than the lower end width.
A clamp opening prevention ring 28 having a reverse taper is fitted into the fitting body 27, a bolt 26 is screwed into the central portion of the fixture body 27, and the lower end portion of the bolt 26 is peeked into the sponge ring 29. The sponge ring 29 and the contact protrusion 21A provided at the open end of the clamp 21 come into contact with the existing pipe 10. The contact protrusion 21A may be omitted.

And the attachment of the fixture 20 to the existing pipe 10 is the eighth.
As shown in Figures (A) and (B), the clamps 21 and 21 are first opened, the tip ends of the clamps 21 and 21 are brought into contact with the existing pipe 10, and the existing pipe 10 is swung to the left and right, and then the clamp is prevented from opening. The ring 28 is dropped from the working hole H and the taper part 21 of the clamp 21
It is fitted to c, the existing pipe 10 is wrapped by the clamps 21 and 21, and is bolted by the box wrench R inserted through the guide pipe P.
By rotating 26, the tip is pushed against the existing pipe 10,
At the same time, the clamps 21, 21 are slightly pulled up, the opening of the clamp 21 is closed, and the contact 21A is embedded in the coating of the existing pipe 10 to make the clamp 21 in the existing pipe 10 in a solid state. Butyl rubber is contained in the sponge ring 29 to prevent the existing pipe 10 from being corroded by the tip of the bolt 26.

After removing the box wrench R and the guide pipe P, the fixture 20 and the clamp opening prevention ring 28 are left in the working hole H.

[Effect of device]

As is clear from the above description, according to the present invention,
The clamp holds the existing pipe, the clamp opening prevention ring prevents the clamp from opening, and the bolt is screwed into the clamp so that the clamp comes into strong contact with the existing pipe. Small size is enough and backfilling pavement work can be done easily.

In addition, since the clamp with the tapered portion is fed by bolts and the taper of the clamp opening prevention ring is used to firmly contact and fix the existing pipe, the clamp can reliably catch the existing pipe and the road surface. It can be easily operated from the ground through the work hole drilled in.

[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, and FIGS. 3 (A) and 3 (B) are sectional views showing excavation work. Explanatory drawing, FIG. 4 is a front view of attachment, FIG. 5 is a front view of a fixture according to another embodiment, FIG. 6 is a front view of the same portion broken, FIG. 7 is the same plan view, and FIG. FIG. 9 is an explanatory view showing the order of attachment to the pipe, FIG. 9 is a plan view of a road surface for explaining a conventional construction method, and FIG. 10 is a sectional view taken along line XX of FIG. 20 …… Mounting fixture, 21 …… Clamp, 21A …… Contact protrusion, 2
1B ... Top end, 22 ... Accommodation part, 23 ... Female screw part, 24 ...
Push spring, 25 …… Clamp opening prevention ring, 26 …… Bolt, 27 …… Fixing body, 28 …… Clamp opening prevention ring, 29 …… Sponge ring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Toshio Nakagawa 4-18-3 Daikan, Yamato City, Kanagawa Pref., Hakko Development Engineering Laboratory Co., Ltd. (56) References Kosho 57-13888 (JP, Y2)

Claims (1)

(57) [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) has a shape capable of enclosing the existing buried pipe (10), and has a box-shaped accommodating portion at the top. It is rotatably supported on the outer peripheral part of (22) via a hinge pin (21D), and the anode electrode (1
A pair of clamps (21, 21) to which 1) is connected, the top of the female screw part (23) provided in the accommodating part (22) and the accommodating part (2).
A push spring (24) which is fitted between the top part of (2) and can slide the female screw part (23) up and down and restrains it in the rotational direction, and a female screw part from the top side of the accommodating part (22). A bolt (26) screwed to (23) and a clamp opening prevention ring (2) fitted below the hinges on the outer circumferences of the clamps (21, 21).
5), the tip of the bolt (26) is screwed into contact with the existing buried pipe (10) to pull up both clamps (21, 21), and both clamps (21, 21) are connected to the existing buried pipe. An electrode attachment device for an electrolytic corrosion prevention device, characterized in that it is configured so as to strongly contact and fix the outer periphery of (10).