JP5645306B2 - Electrocorrosion effect monitoring device, cover for underground structure provided with the same, and method for monitoring anticorrosion effect - Google Patents

Description

  The present invention relates to a device for monitoring the anticorrosion effect of an underground buried object that is electrically protected by a galvanic anode method, a lid for an underground structure provided with the device, and a method for monitoring the anticorrosion effect.

  In addition, since the "underground object" as used in this-application specification is a target of anticorrosion, it presupposes that it is comprised including the metal.

  It has been known for a long time that underground surfaces such as gas pipes and water pipes come into contact with electrolytes such as soil and water and the surface thereof is corroded, and electrocorrosion is known as one of the anticorrosion measures.

  As a method of cathodic protection, there are a galvanic anode method, an external power supply method, a selective drainage method, etc. Among them, the galvanic anode method uses a metal (for example, magnesium, aluminum, etc.) having a lower potential than the underground buried object. It is a system that is electrically connected to underground buried objects and uses a potential difference generated between the two to flow an anticorrosive current through the underground buried objects, and is widely used as an anti-corrosion method for gas pipes and water pipes. (For example, Patent Documents 1 and 2).

  It is necessary to periodically check and check the anti-corrosion effect for underground anti-corrosion objects that are anti-corrosive by the galvanic anode method. The inspection of this anti-corrosion effect is generally performed by opening the terminal box (cover for the underground structure) that is installed corresponding to the underground burial object, and for the inspection that is placed inside the terminal box. This is done by connecting a voltmeter to the terminals, measuring the potential difference between the terminals, and checking whether the potential difference is equal to or greater than a predetermined value.

  Thus, the conventional inspection work for the anticorrosion effect involves the work of opening the terminal box cover for each target underground object and connecting a voltmeter to the inspection terminal, which is time consuming and time consuming. In addition, the cost of inspection has become enormous. Therefore, even if it is desired to increase the frequency of inspections, there is no choice but to lose weight due to cost problems. there were.

  On the other hand, Patent Literature 3 proposes an anticorrosion effect measurement system that measures the anticorrosion effect by wireless remote operation without opening the lid of the terminal box and collects the measurement data. However, this system requires a communication means or a power source for a digital voltmeter, so that the system becomes a large-scale system, and the initial cost is particularly high. In addition, it is necessary to periodically replace and charge the power source, which requires labor and cost in terms of maintenance.

JP 58-34288 A JP 58-136784 A JP 2003-323688 A

  The problem to be solved by the present invention can be easily confirmed without using an external power source, and can be realized at a low cost, without using an external power source. An object of the present invention is to provide an anticorrosive effect monitoring device, a lid for an underground structure equipped with the same, and a method for monitoring the anticorrosive effect.

  The present invention has solved the above problems by a new idea of utilizing a corrosion-proof current by a galvanic anode method as a power source.

That is, the anticorrosion effect monitoring device of the present invention is an anticorrosion effect monitoring device provided on a cover for an underground structure that is installed corresponding to an underground buried object that is anticorrosive by a galvanic anode method , A first terminal connected to a first terminal for inspection connected to a current-carrying anode, a second terminal connected to a second terminal for inspection connected to an underground object, and the first is connected to the terminal and the second terminal, characterized by comprising monitoring means, the actuating the protection current due to a galvanic anode method as power. In the cathodic protection effect monitoring device of the present invention, the monitoring means is preferably provided at a position where the operating state can be confirmed from the ground.

Further, the method for monitoring the anticorrosion effect of the present invention is a method for monitoring the anticorrosion effect of an underground buried object that is electrically protected by the galvanic anode method, and is connected to the first terminal for inspection connected to the galvanic anode. 1 terminal and a second terminal connected to a second terminal for inspection connected to an underground buried object, and further connected to the first terminal and the second terminal. The monitoring means that operates using the anticorrosion current according to the system as a power source is provided at a position where the operating state can be confirmed from the ground, and the anticorrosion effect is monitored by checking the operating state of the monitoring means from the ground.

  As described above, in the present invention, since the anticorrosion current by the galvanic anode method is used as the power source for the monitoring means, an external power source is unnecessary, and maintenance such as replacement and charging of the power source is unnecessary. In addition, simply by confirming the operating state of the monitoring means, the anticorrosion effect can be easily confirmed without the work of connecting a voltmeter to the inspection terminal as in the prior art. Furthermore, if the monitoring means is provided at a position where the operating state can be confirmed from the ground, the anticorrosion effect can be more easily confirmed without opening the terminal box cover as in the prior art. In addition, since the apparatus configuration is substantially only the monitoring means and its associated devices, the apparatus configuration is simple, and cost reduction can be realized.

  In this invention, it is preferable to provide a monitoring means in the lid | cover for underground structures, such as a terminal box installed corresponding to an underground buried object. The underground structure lid provided with the monitoring device of the present invention including the monitoring means is the underground structure lid of the present invention. As a result, the monitoring means and its associated equipment can be arranged using the space in the underground structure lid, and power can be supplied to the monitoring means using the inspection terminals that have been installed conventionally.

  As the monitoring means, a light emitter such as an LED is preferably used. A display body that displays characters and figures by current and a sounding body that emits sound can be used. However, the light emitting body is the simplest and its operating state (lighted state) is easy to visually confirm. In particular, LEDs with low power consumption are preferred.

  According to the present invention, it is possible to easily confirm the anticorrosion effect of an underground buried object that is anticorrosive by the galvanic anode method without using an external power source. Moreover, since the apparatus configuration is simplified and basically no maintenance is required, both initial cost and maintenance cost can be reduced. As a result, it is possible to increase the frequency of inspection of the anticorrosion effect and contribute to the prevention of corrosion accidents in underground structures.

The whole structure of the cathodic protection system of an underground buried object to which the cathodic protection effect monitoring device of the present invention is applied is shown conceptually. It is a circuit diagram of the cathodic protection effect monitoring device of the present invention shown in FIG. The state which installed the cathodic protection effect monitoring apparatus of this invention in the lid | cover for underground structures, (a) shows the lid | cover for underground structures, (b) shows the back surface side of a lid | cover main body.

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

  FIG. 1 conceptually shows the overall structure of an underground anticorrosion system to which the apparatus for monitoring the corrosion protection effect of the present invention is applied. The anticorrosion effect monitoring apparatus 10 shown in the figure includes an LED (light emitting body) 11 as a monitoring means and an accessory device 12 for operating the LED 11, and is installed on an underground structure lid 20. The terminal 12 a-1, which is one of the incidental devices 12 of the cathodic protection effect monitoring device 10, is connected to the galvanic anode 30, and the terminal 12 a-2 is connected to the underground buried object 40. Thereby, the anticorrosion current based on the electric potential difference between the electroplating anode 30 and the underground burying object 40 flows into the electric anticorrosion effect monitoring device 10, and the LED 11 operates using this anticorrosion current as a power source.

  FIG. 2 is a circuit diagram of the cathodic protection effect monitoring apparatus 10 of the present invention shown in FIG. As described above, the terminal 12a-1 is connected to the galvanic anode, and the terminal 12a-2 is connected to the underground object. There is a potential difference of about 1 V between the terminal 12a-1 and the terminal 12a-2 in a general case where the galvanic anode is magnesium and the underground object is iron. In the example of FIG. 2, the anticorrosion current is boosted to about 3 V by the booster circuit 12b, and the LED 11 is operated and lit using this anticorrosion current as a power source. Note that the LED may be turned on or off at all times.

  An LED driver 12c is connected to the LED 11. The LED driver 12c controls the lighting cycle, lighting time, and lighting start voltage of the LED 11. A well-known LED driver 12c can be used, and the LED driver 12c includes, for example, an oscillation circuit, a transistor switch, and a resistor. Further, a well-known booster circuit 12b can be used, and the booster circuit 12b includes, for example, a chopper IC, a coil, a capacitor, and a diode. The booster circuit 12b, the LED driver 12c, and the terminals 12a-1 and 12a-2 are the accessory device 12 shown in FIG.

  The output of the booster circuit 12b is connected to the LED 11 as described above, and supplies the driving power for the LED 11 and the power for the LED driver 12c. On the other hand, a current of a certain level or more always flows between the terminals 12a-1 and 12a-2 as the power source of the booster circuit 12b, and acts as an anticorrosion current for the original anticorrosion. Therefore, it is possible to monitor the cathodic protection effect by confirming whether the LED 11 is lit without impairing the cathodic protection effect. Specifically, if the LED 11 is lit, there is a potential difference of a predetermined value or more between the galvanic anode and the underground buried object, and a sufficient anticorrosion current flows, and a predetermined electrocorrosion effect is obtained. That is, if the LED 11 is not lit, the anticorrosive effect is lost. In the latter case, predetermined measures such as replacing the galvanic anode are taken.

  FIG. 3 shows a state in which the cathodic protection effect monitoring device of the present invention is installed on the underground structure lid, (a) shows the underground structure lid, and (b) shows the back side of the lid body. The lid 20 for an underground structure shown in the figure includes a lid body 21 and a receiving frame 22 that supports the lid body 21 so as to be openable and closable, and corresponds to a conventional terminal box. Correspondingly installed.

  The booster circuit 12b and the LED driver 12c shown in FIG. 2 can be packaged. In the example of FIG. 3, the accessory device package 12d is installed on the back side of the lid body 21. The LED 11 is attached to the tip of the wiring 11a extending from the accessory device package 12d, and is installed at a position where it can be seen from the surface side of the lid body 21. The terminals 12a-1 and 12a-2 extend from the accessory device package 12d, and these terminals 12a-1 and 12a-2 are connected to inspection terminals that have been conventionally installed. Specifically, the terminal 12a-1 is connected to the terminal connected to the current-carrying anode among the inspection terminals, and the terminal 12a-2 is connected to the inspection terminal connected to the underground buried object. Thereby, the cathodic protection effect monitoring device of the present invention operates.

  In the above configuration, the LED 11 as the monitoring means is provided at a position where the operating state (lighting state) can be confirmed from the ground. The anti-corrosion effect can be monitored without opening.

  In addition, LED11 as a monitoring means can also be provided in the back surface side of the lid | cover main body 21, or the inside of the lid | cover for underground structures. In this case, it is necessary to open the lid body 21 in order to check the anticorrosion effect. However, in order to check the anticorrosion effect, it is only necessary to check the operating state (lighting state) of the LED 11, and it is necessary for inspection as in the past Since the work of connecting a voltmeter to the terminal is not required, the anticorrosion effect can be easily confirmed as compared with the conventional case.

10 Electrocorrosion effect monitoring device 11 LED (monitoring means)
11a Wiring 12 Auxiliary equipment 12a-1, 12a-2 Terminal 12b Booster circuit 12c LED driver 12d Auxiliary equipment package 20 Lid for underground structure 21 Lid body 22 Receiving frame 30 Current-carrying anode 40 Underground object

Claims (6)

An anti-corrosion effect monitoring device provided on a cover for an underground structure installed corresponding to an underground buried object that is electrically protected by a galvanic anode method ,
A first terminal connected to a first terminal for inspection connected to the galvanic anode;
A second terminal connected to a second terminal for inspection connected to the underground object;
Monitoring means connected to the first terminal and the second terminal and operating as a power source with a corrosion-proof current by a galvanic anode method ;
An anti-corrosion effect monitoring device.   The cathodic protection effect monitoring device according to claim 1, wherein the monitoring means is provided at a position where the operating state can be confirmed from the ground.   3. The cathodic protection effect monitoring device according to claim 1, wherein the monitoring means is a light-emitting body that is lit using a corrosion-proof current by a galvanic anode method as a power source.   The lid | cover for underground structures provided with the cathodic protection effect monitoring apparatus in any one of Claims 1-3. In the method of monitoring the anti-corrosion effect of the underground buried object that is electrically protected by the galvanic anode method , the first terminal is connected to the first terminal for inspection connected to the galvanic anode, and the underground buried object Monitoring means for connecting the second terminal to the connected second terminal for inspection and further connected to the first terminal and the second terminal and operating with a galvanic anode type anticorrosion current as a power source. A method for monitoring the anticorrosion effect, wherein the anticorrosion effect is monitored by providing the operation state from the ground and confirming the operation state of the monitoring means from the ground. 6. The electricity according to claim 5 , wherein the monitoring means is provided with a light-emitting body that is turned on using a galvanic anode-type anticorrosion current as a power source, and the lighting state of the light-emitting body is visually confirmed from the ground. Anticorrosive effect monitoring method.

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