A composite probe for measuring the stray current interference state of a buried pipeline

Abstract

The utility model discloses a kind of composite probes for measuring the stray current interference state of buried pipeline, including hollow probe rod, test piece, reference electrode and cable, one end of each cable in cable is connected with test piece and reference electrode respectively, the other end is connected with intelligent acquisition device;Test piece is located hollow probe rod outside, contactable with soil when using;Reference electrode includes red copper stick, hollow probe rod is provided with liquid cavity, saturated copper sulfate solution is filled in liquid cavity, red copper stick is immersed in saturated copper sulfate solution, slow-release piece is arranged on the cavity wall of liquid cavity, slow-release piece is used for saturated copper sulfate solution to slowly penetrate into soil through slow-release piece, the lower end of hollow probe rod is installed with pagoda drill bit when using, the other end is installed with rotating handle.To achieve can easily cross soil layer, realize quick measurement, the effect of convenient, fast is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a composite probe for measuring stray current interference in buried pipelines. Background Technology

[0002] With the rapid development of national power and electrified railways, a large number of high-voltage lines and urban AC / DC rail transit systems have been constructed and put into operation. This inevitably leads to situations where high-voltage lines and railway lines run parallel to or intersect with buried pipelines. During operation, these facilities generate stray currents in the surrounding environment due to electromagnetic induction and capacitance effects. When these stray currents flow through the pipelines into the soil, they cause electrochemical corrosion on the pipeline surface, leading to perforation and thinning of the pipeline wall. This corrosion not only shortens the service life of the pipeline but may also cause serious safety accidents. Therefore, it is necessary to pay close attention to the hazards of stray interference to pipelines, to inspect and assess pipeline sections that may be affected by stray current interference, and to take effective measures to prevent and control interference in areas with severe interference.

[0003] Currently, the test piece method is commonly used to measure the stray current interference level in pipelines. This involves burying test pieces and reference electrodes near the pipeline and using intelligent data acquisition equipment to measure and read relevant stray current interference parameters. The conventional test piece method involves excavation and backfilling around the pipeline, which is time-consuming and costly. In some areas, coordination and obtaining excavation permits are also required (especially in urban gas pipeline areas), affecting the overall measurement progress and efficiency. Furthermore, improper on-site excavation and installation can affect measurement accuracy and results (e.g., excessive distance between the reference electrode and test piece, poor contact between the reference electrode or test piece and the soil medium, insufficient soil compaction, etc.), making repeated excavation, installation, and measurement work even more time-consuming and labor-intensive.

[0004] Therefore, this utility model proposes a composite probe for measuring stray current interference in buried pipelines, which integrates the reference electrode and the test piece into one unit, enabling convenient and quick measurement, and allowing for rapid probe setup even during repeated measurements. Utility Model Content

[0005] To overcome the shortcomings of the above-mentioned related technologies, this application provides a composite probe for measuring the stray current interference state of buried pipelines. It can easily penetrate the soil layer to achieve rapid measurement and is convenient and quick to use. It solves the problems of distance or poor contact in the excavation and burial of traditional test pieces and reference electrodes, and reduces measurement errors. The saturated copper sulfate solution and the slow-release element can quickly establish an ion channel with the test environment, so that the electrode reaction can quickly reach equilibrium.

[0006] This application provides a composite probe for measuring stray current interference in buried pipelines, comprising a hollow probe rod, a test piece, a reference electrode, and a cable. The hollow probe is used to install the test piece, reference electrode, and cable; One end of each of the three-core cables is connected to the test piece and the reference electrode, respectively, and the other end is connected to the intelligent acquisition device. The test piece is located on the outside of the hollow probe and can come into contact with the soil during use; The hollow probe is equipped with a pagoda drill bit at the lower end and a rotating handle at the other end.

[0007] Preferably, the reference electrode comprises a copper rod, the hollow probe is provided with a liquid cavity, the liquid cavity is filled with a saturated copper sulfate solution, the copper rod is immersed in the saturated copper sulfate solution, and a slow-release element is provided on the wall of the liquid cavity, the slow-release element is used for the saturated copper sulfate solution to slowly permeate into the soil through the slow-release element.

[0008] Preferably, the liquid chamber is located at the end of the hollow probe rod near the pagoda drill bit, and a plug is provided between the hollow probe rod and the pagoda drill bit. The plug is detachably connected to the hollow probe rod, and saturated copper sulfate solution can be added to the liquid chamber after the plug is removed.

[0009] Preferably, the plug and the pagoda drill bit are manufactured as a single unit.

[0010] Preferably, the sustained-release element is a porous permeable ceramic.

[0011] Preferably, the wall of the liquid chamber is provided with a plurality of through holes and an annular groove, the through holes and the annular groove being connected, and a slow-release element being provided in the annular groove.

[0012] Preferably, a rubber gasket is provided between the annular porous permeable ceramic and the sidewall of the annular groove.

[0013] Preferably, the hollow probe includes a hollow rod body and a connector, the test piece and the reference electrode are mounted on the connector, and the connector is detachably connected to the hollow probe.

[0014] Preferably, the DC test piece is a ring-shaped metal sheet, and the contact area between the DC test piece and the soil is 6.5~10 cm². 2 .

[0015] Preferably, the AC test piece is a ring-shaped metal sheet, and the contact area between the AC test piece and the soil is 1 cm². 2 .

[0016] Compared with related technologies, this utility model has the following advantages: the pagoda drill bit and the rotating handle work together to rotate the pagoda drill bit, which can easily penetrate the soil layer and allow the DC test piece, AC test piece, and reference electrode to quickly enter the soil layer, enabling rapid measurement. It is convenient and quick to use; it solves the problem of distance or poor contact in the excavation and burial of traditional test pieces and reference electrodes, reducing measurement errors; and it saves measurement costs and time.

[0017] Slow-release components (porous permeable ceramics) allow the electrolyte to slowly seep out, forming an ion-conducting pathway with the external environment (such as soil and water), while minimizing the rate at which the internal solution is contaminated or diluted.

[0018] Specifically, when the reference electrode is brought into contact with the test environment (such as soil or water) through porous permeable ceramic, an electrochemical circuit is established through ionic conduction. The copper rod lead of the reference electrode is connected to one input terminal of a voltmeter (usually the "reference" terminal). The other electrode (the working electrode, such as a buried pipeline or storage tank) is connected to the other input terminal of the voltmeter. The voltage value measured by the voltmeter is the potential of the working electrode relative to the reference electrode. This potential value is a key parameter for evaluating the electrochemical state of the working electrode (such as corrosion tendency and cathodic protection effect). Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of Example 1; Figure 2 yes Figure 1 Enlarged view of section A in the middle; Attached Figures: 1. Core probe rod, 11. Hollow rod body, 12. Connector, 121. Annular groove, 122. Through hole, 123. Rubber gasket, 13. Saturated copper sulfate solution, 2. DC test piece, 3. AC test piece, 4. Copper rod, 5. Three-core cable, 6. Porous permeable ceramic, 7. Pagoda drill bit, 8. Rotary handle, 9. Plug. Detailed Implementation

[0020] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-2As shown, a composite probe for measuring stray current interference in buried pipelines includes a hollow probe rod 1, a DC test piece 2, an AC test piece 3, a reference electrode, and a three-core cable 5. The hollow probe rod 1 includes a hollow rod body 11 and a connector 12, which are detachably connected, specifically via a threaded connection. The DC test piece 2, AC test piece 3, and reference electrode are mounted on the connector 12, facilitating their installation and maintenance. In another embodiment, the hollow rod body 11 and the connector 12 can be manufactured as a single piece.

[0023] One end of each of the three-core cables 5 is connected to the DC test piece 2, the AC test piece 3, and the reference electrode 4, respectively. The other end passes through the cavity inside the hollow rod 11 and exits from the tail of the hollow rod 11 to connect with the intelligent acquisition device. The intelligent acquisition device is used to measure and read relevant stray current interference state parameters.

[0024] DC test piece 2 and AC test piece 3 are located outside the connector 12 and can come into contact with the soil during use; the exposed area of ​​AC test piece 3 is 1 cm². 2 It is used to measure AC interference voltage, DC interference voltage, and AC / DC interference current density to evaluate the level of AC / DC interference; the exposed area of ​​DC test piece 2 is 6.5-10 cm². 2 It is used to measure the pipeline protection potential and the cathodic protection DC current density, reflecting the state of the pipeline under cathodic protection; The reference electrode includes a copper rod 4, and a liquid chamber is provided on the connector 12. The liquid chamber is filled with a saturated copper sulfate solution 13, and the copper rod 4 is immersed in the saturated copper sulfate solution 13 to ensure that the concentration of Cu²⁺ remains saturated during the electrochemical reaction. A porous permeable ceramic 6 is disposed on the wall of the liquid chamber. The porous permeable ceramic 6 allows the saturated copper sulfate solution to slowly permeate out, forming an ion-conducting pathway with the external environment (such as soil or water), while minimizing the rate at which the internal solution is contaminated or diluted. The porous permeable ceramic 6, the copper rod 4, and the saturated copper sulfate solution 13 constitute the reference electrode for measurement.

[0025] Specifically, the liquid chamber is located at the end of the connector 12 away from the hollow rod 11. An annular groove 121 is provided on the outer wall of the connector 12, and the porous permeable ceramic 6 is embedded annularly within the annular groove. Several through holes 122 are provided on the wall of the liquid chamber on the connector 12, and these through holes 122 communicate with both the annular groove 121 and the liquid chamber. A rubber gasket 123 is provided between the annular porous permeable ceramic 6 and the side wall of the annular groove 121.

[0026] A pagoda drill bit 7 is mounted on one end of the connector 12 away from the hollow rod 11, and a rotating handle 8 is mounted on the other end. The pagoda drill bit 7 ensures that the composite probe can more easily penetrate the soil and deliver the reference electrode and test piece to the designated measurement position. A plug 9 is provided between the connector 12 and the pagoda drill bit 7. The plug 9 is detachably connected to the connector 12. Specifically, the plug 9 and the connector 12 are connected by threads. When the plug 9 is removed, a saturated copper sulfate solution can be added to the liquid chamber. In another embodiment, the plug and the pagoda drill bit can be manufactured as a single piece.

[0027] The gap inside the connector 12 is filled with a sealing material, specifically epoxy resin, to isolate and insulate the cable connection joints of the AC test piece 3, DC test piece 2 and copper rod 4, preventing short circuits; at the same time, it prevents the saturated copper / copper sulfate solution 13 from penetrating, contaminating and corroding the joints, AC test piece 3 and DC test piece 2.

[0028] The working principle of the reference electrode is based on the reversible redox reaction of copper in copper sulfate solution. This reaction reaches thermodynamic equilibrium on the electrode surface, thereby establishing a stable and reproducible electrode potential.

[0029] When the reference electrode is brought into contact with the test environment (such as soil or water) through porous permeable ceramic, an electrochemical circuit is established through ionic conduction. The copper rod lead of the reference electrode is connected to one input terminal of a voltmeter (usually the "reference" terminal). The other electrode (the working electrode, such as a buried pipeline or storage tank) is connected to the other input terminal of the voltmeter. The voltage value measured by the voltmeter is the potential of the working electrode relative to the reference electrode. This potential value is a key parameter for evaluating the electrochemical state of the working electrode (such as corrosion tendency and cathodic protection effect).

[0030] The porous permeable ceramic design of the reference electrode enables it to quickly establish ion channels with the testing environment, resulting in rapid electrode reaction equilibrium and stable readings typically obtained within seconds to a minute. This makes it ideal for scenarios requiring rapid, multi-point detection, significantly improving work efficiency. The reference electrode can be manufactured as a lightweight, handheld or probe-type device, making it easy to carry. In use, simply insert it into the soil or immerse it in water, connect the leads, and read the value.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A composite probe for measuring stray current interference in buried pipelines, characterized in that, Includes hollow probe, test piece, reference electrode, and cable. The hollow probe is used to install the test piece, reference electrode, and cable; One end of each of the three-core cables is connected to the test piece and the reference electrode, respectively, and the other end is connected to the intelligent acquisition device. The test piece is located on the outside of the hollow probe and can come into contact with the soil during use; The hollow probe is equipped with a pagoda drill bit at the lower end and a rotating handle at the other end.

2. The composite probe for measuring stray current interference in buried pipelines according to claim 1, characterized in that, The reference electrode includes a copper rod, and a liquid cavity is provided on the hollow probe. The liquid cavity is filled with a saturated copper sulfate solution, and the copper rod is immersed in the saturated copper sulfate solution. A slow-release element is provided on the wall of the liquid cavity, and the slow-release element is used to allow the saturated copper sulfate solution to slowly permeate into the soil.

3. A composite probe for measuring stray current interference in buried pipelines according to claim 2, characterized in that, The liquid chamber is located at the end of the hollow probe rod near the pagoda drill bit. A plug is provided between the hollow probe rod and the pagoda drill bit. The plug is detachably connected to the hollow probe rod. When the plug is removed, a saturated copper sulfate solution can be added to the liquid chamber.

4. A composite probe for measuring stray current interference in buried pipelines according to claim 3, characterized in that, The plug and the pagoda drill bit are manufactured as a single unit.

5. A composite probe for measuring stray current interference in buried pipelines according to claim 2, characterized in that, The slow-release element is a porous permeable ceramic.

6. A composite probe for measuring stray current interference in buried pipelines according to claim 2, characterized in that, The wall of the liquid chamber is provided with several through holes and annular grooves, the through holes and annular grooves are connected, and a slow-release element is provided in the annular groove.

7. A composite probe for measuring stray current interference in buried pipelines according to claim 6, characterized in that, A rubber gasket is provided between the annular porous permeable ceramic and the sidewall of the annular groove.

8. A composite probe for measuring stray current interference in buried pipelines according to claim 1, characterized in that, The hollow probe includes a hollow rod body and a connector. The test piece and reference electrode are mounted on the connector, and the connector is detachably connected to the hollow probe.

9. A composite probe for measuring stray current interference in buried pipelines according to claim 1, characterized in that, The DC test piece is a ring-shaped metal sheet, and the contact area between the DC test piece and the soil is 6.5~10cm². 2 .

10. A composite probe for measuring stray current interference in buried pipelines according to claim 1, characterized in that, The AC test piece is a ring-shaped metal sheet, and the contact area between the AC test piece and the soil is 1 cm². 2 .

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