Composite probe for measuring stray current interference state of buried pipeline

Abstract

The invention discloses a composite probe for measuring the stray current interference state of a buried pipeline, which comprises a hollow probe rod, a direct current test piece, an alternating current test piece, a reference electrode and a three-core cable, one end of each cable in the three-core cable is respectively connected with the direct current test piece, the alternating current test piece and the reference electrode, and the other end of each cable in the three-core cable is connected with intelligent acquisition equipment; the direct-current test piece and the alternating-current test piece are positioned on the outer side of the hollow probe rod and can be in contact with soil during use; the reference electrode comprises a red copper rod, a liquid cavity is formed in the hollow probe rod, the liquid cavity is filled with a saturated copper sulfate solution, the red copper rod is immersed in the saturated copper sulfate solution, a slow release part is arranged on the cavity wall of the liquid cavity, and the saturated copper sulfate solution slowly permeates into soil through the slow release part; the lower end of the hollow feeler lever in use is provided with a pagoda drill bit, and the other end is provided with a rotating handle. Therefore, the effects of easily penetrating through the soil layer, realizing rapid measurement and being convenient and rapid to use are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, in particular to a composite probe for measuring stray current interference state of buried pipeline. BACKGROUND

[0002] With the rapid development of national power and electrified railway, a large number of high-voltage lines and urban AC and DC rail transit are under construction and put into operation, and it is inevitable that high-voltage lines and railway lines are parallel or intersected with buried pipelines. During the operation of these facilities, stray current will be generated in the surrounding environment due to electromagnetic induction and capacitive effect, and when the stray current flows into the soil through the pipeline, it will cause electrochemical corrosion on the surface of the pipeline, resulting in perforation and wall thickness reduction of the pipeline. This corrosion not only shortens the service life of the pipeline, but also may cause serious safety accidents. Therefore, it is necessary to pay high attention to the harm of stray interference to the pipeline, detect and evaluate the pipeline sections that may be interfered by stray current, and take effective measures to prevent and control the serious interference areas.

[0003] Currently, the test piece method is usually used to measure the stray current interference level of the pipeline, mainly by burying test pieces and reference electrodes near the pipeline, and using intelligent acquisition equipment to measure and read relevant stray current interference state parameters. The conventional test piece method involves pipeline surrounding earth excavation and backfilling, which requires a certain amount of time and cost, and in some areas, coordination and excavation proof handling work (especially in urban gas pipeline areas) are required, which affects the progress and efficiency of the entire measurement. In addition, improper on-site excavation and burying operation will affect the measurement accuracy and results (such as too large distance between reference electrode and test piece, poor contact between reference electrode or test piece and soil medium, insufficient soil backfilling density, etc.), and repeated excavation, burying and measurement work is more time-consuming and laborious.

[0004] Therefore, the present application provides a composite probe for measuring stray current interference state of buried pipeline, which integrates reference electrode and test piece, can conveniently and quickly realize measurement, and can quickly complete probe arrangement even when repeated measurement is performed. SUMMARY

[0005] The present application overcomes the defects of the above related technologies, and provides a composite probe for measuring stray current interference state of buried pipeline, which can easily pass through the soil layer, realize rapid measurement, and is convenient and fast to use. The problems of distance or poor contact existing in the excavation and burying of traditional test pieces and reference electrodes are solved, and the measurement error is reduced. The saturated copper sulfate solution cooperates with the slow-release member to quickly establish an ion channel with the test environment, so that the electrode reaction quickly reaches equilibrium.

[0006] The application provides a composite probe for measuring stray current interference state of a buried pipeline, comprising a hollow probe rod, a direct current test piece, an alternating current test piece, a reference electrode and a three-core cable, The hollow probe rod is used for mounting the direct current test piece, the alternating current test piece, the reference electrode and the three-core cable; One end of each cable in the three-core cable is connected with the direct current test piece, the alternating current test piece and the reference electrode respectively, and the other end is connected with an intelligent acquisition device; The direct current test piece and the alternating current test piece are located outside the hollow probe rod and can contact with soil during use; The reference electrode is a red copper rod, a liquid cavity is arranged on the hollow probe rod, the liquid cavity is filled with saturated copper sulfate solution, the red copper rod is immersed in the saturated copper sulfate solution, a slow-release member is arranged on the cavity wall of the liquid cavity, and the slow-release member is used for slowly permeating the saturated copper sulfate solution into the soil through the slow-release member, The lower end of the hollow probe rod is provided with a pagoda drill bit during use, and the other end is provided with a rotating handle.

[0007] Preferably, the slow-release member is porous permeation ceramic.

[0008] Preferably, a plurality of through holes and annular grooves are arranged on the cavity wall of the liquid cavity, the through holes and the annular grooves are communicated, and annular porous permeation ceramic is arranged in the annular grooves.

[0009] Preferably, a rubber gasket is arranged between the annular porous permeation ceramic and the side wall of the annular groove.

[0010] Preferably, the direct current test piece is an annular metal sheet, and the contact area of the direct current test piece with the soil is 1cm 2 .

[0011] Preferably, the alternating current test piece is an annular metal sheet, and the contact area of the alternating current test piece with the soil is 6.5cm 2 .

[0012] Preferably, the liquid cavity is arranged at the end of the hollow probe rod close to the pagoda drill bit, a plug is arranged between the hollow probe rod and the pagoda drill bit, the plug is detachably connected with the hollow probe rod, and the saturated copper sulfate solution can be added into the liquid cavity after the plug is detached.

[0013] Preferably, the plug and the pagoda drill bit are integrally manufactured.

[0014] Preferably, the hollow probe rod comprises a hollow rod body and a connecting piece, the direct current test piece, the alternating current test piece and the reference electrode are mounted on the connecting piece, and the connecting piece is detachably connected with the hollow probe rod.

[0015] Compared with the related art, the application has the following advantages: the pagoda drill is matched with the rotating handle, the pagoda drill can be rotated through the rotating handle, the pagoda drill can easily pass through the soil layer, and the direct current test piece, the alternating current test piece and the reference electrode can quickly enter the soil layer, so that the rapid measurement can be realized, and the application is convenient and fast; the distance or the poor contact existing in the excavation and embedding of the traditional test piece and the reference electrode is solved, and the measurement error is reduced; and the measurement cost and time are saved.

[0016] The slow-release member (porous permeable ceramic) allows the electrolyte to slowly seep out and form an ion conductive path with the external environment (such as soil, water), while minimizing the speed of internal solution pollution or dilution.

[0017] Specifically, when the reference electrode is in contact with the measured environment (such as soil, water) through the porous permeable ceramic, an electrochemical circuit is established through ion conduction. The copper rod lead of the reference electrode is connected to one input end (usually the "reference" end) of the voltmeter. The other electrode (working electrode, such as buried pipeline, tank, etc.) is connected to the other input end of the voltmeter. At this time, the voltage value measured by the voltmeter is the potential of the working electrode relative to the reference electrode, and this potential value is a key parameter for evaluating the electrochemical state (such as corrosion tendency, cathodic protection effect) of the working electrode. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of Example 1; Figure 2 is Figure 1 is an enlarged view of part A in The drawings: heart probe rod 1, hollow rod body 11, connecting piece 12, annular groove 121, through hole 122, rubber gasket 123, saturated copper sulfate solution 13, direct current test piece 2, alternating current test piece 3, red copper rod 4, three-core cable 5, porous permeable ceramic 6, pagoda drill 7, rotating handle 8, plug 9. DETAILED DESCRIPTION

[0019] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the application, and are not intended to limit the protection scope of the embodiments of the application. Those skilled in the art can adjust them as needed to adapt to specific application occasions.

[0020] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0021] For example, Figures 1-2As shown, a composite probe for measuring stray current interference state of buried pipeline 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 connecting piece 12, and the hollow rod body 11 is detachably connected with the connecting piece 12, specifically through threaded connection. The DC test piece 2, the AC test piece 3 and the reference electrode are installed on the connecting piece 12, facilitating installation and maintenance of the DC test piece 2, the AC test piece 3 and the reference electrode. In another embodiment, the hollow rod body 11 and the connecting piece 12 can be integrally manufactured.

[0022] One end of each cable in the three-core cable 5 is connected with the DC test piece 2, the AC test piece 3 and the reference electrode 4 respectively, and the other end passes through the cavity in the hollow rod body 11 and is connected with an intelligent acquisition device from the tail of the hollow rod body 11. The intelligent acquisition device is used for measuring and reading relevant stray current interference state parameters.

[0023] The DC test piece 2 and the AC test piece 3 are located outside the connecting piece 12 and can be in contact with soil during use; the exposed area of the AC test piece 3 is 1 cm2, which is used for measuring AC interference voltage, DC interference voltage and AC / DC interference current density, and evaluating AC / DC interference level; the exposed area of the DC test piece 2 is 6.5 cm2, which is used for measuring pipeline protection potential and cathodic protection DC current density, and reflecting the state of pipeline under cathodic protection; The reference electrode includes a red copper rod 4, and the connecting piece 12 is provided with a liquid cavity, and the liquid cavity is filled with saturated copper sulfate solution 13. The red copper rod 4 is immersed in the saturated copper sulfate solution 13, so that the concentration of Cu²⁺ in the electrochemical reaction is always in a saturated state. A porous permeable ceramic 6 is arranged on the cavity wall of the liquid cavity. The porous permeable ceramic 6 allows the saturated copper sulfate solution to slowly seep out, forming an ion conductive path with the external environment (such as soil, water), while minimizing the speed of internal solution being contaminated or diluted. The porous permeable ceramic 6, the red copper rod 4 and the saturated copper sulfate solution 13 constitute a measurement reference electrode.

[0024] Specifically, the liquid cavity is arranged at the end of the connecting piece 12 away from the hollow rod body 11, and the outer wall of the connecting piece 12 is provided with an annular groove 121, and the porous permeable ceramic 6 is annularly embedded in the annular groove. A plurality of through holes 122 are arranged on the cavity wall of the liquid cavity of the connecting piece 12 and communicate with the annular groove 121 and the liquid cavity respectively. Rubber pads 123 are arranged between the annular porous permeable ceramic 6 and the side wall of the annular groove 121.

[0025] The connecting piece 12 is provided with a cone drill bit 7 at one end away from the hollow rod body 11, and a rotating handle 8 at the other end. The cone drill bit 7 can ensure that the composite probe is more easily penetrated into the soil and the reference electrode and test piece are sent to the designated measurement position; a plug 9 is arranged between the connecting piece 12 and the cone drill bit 7, and the plug 9 is detachably connected with the connecting piece 12. Specifically, the plug 9 is connected with the connecting piece 12 through threads, and when the plug 9 is removed, the saturated copper sulfate solution can be added into the liquid cavity. In another embodiment, the plug and the cone drill bit can be integrally manufactured.

[0026] The space inside the connecting piece 12 is filled with a sealing filling material, and specifically, the sealing filling material is epoxy resin, which isolates and insulates the cable connection joint of the alternating current test piece 3, the direct current test piece 2 and the copper rod 4, preventing short circuit; at the same time, the saturated copper / copper sulfate solution 13 is prevented from penetrating, polluting and corroding the joint, the alternating current test piece 3 and the direct current test piece 2.

[0027] The working principle of the reference electrode is based on the reversible oxidation-reduction reaction of copper in the copper sulfate solution. The reaction reaches thermodynamic equilibrium on the surface of the electrode, thereby establishing a stable and reproducible electrode potential.

[0028] When the reference electrode is in contact with the measured environment (such as soil, water) through the porous permeable ceramic, an electrochemical circuit is established through ion conduction. The copper rod lead of the reference electrode is connected to one input end (usually the "reference" end) of a voltmeter. Another electrode (working electrode, such as buried pipeline, storage tank, etc.) is connected to the other input end of the voltmeter. At this time, the voltage value measured by the voltmeter is the potential of the working electrode relative to the reference electrode, and this potential value is a key parameter for evaluating the electrochemical state (such as corrosion tendency, cathodic protection effect) of the working electrode.

[0029] The porous permeable ceramic design of the reference electrode enables it to quickly establish an ion channel with the test environment, and the electrode reaction reaches equilibrium quickly, usually within a few seconds to one minute to obtain a stable reading. It is very suitable for scenarios that require rapid multi-point detection, greatly improving work efficiency. The reference electrode can be made into a portable or probe type, which is light in weight and small in size, and is easy to carry. When used, it only needs to be inserted into the soil or immersed in water, and the lead is connected to read the value.

[0030] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A composite probe for measuring the state of stray current interference of a buried pipeline, characterized by, The hollow probe rod, the direct current test piece, the alternating current test piece, the reference electrode and the three-core cable, The hollow probe rod is used for mounting the direct current test piece, the alternating current test piece, the reference electrode and the three-core cable; One end of each cable of the three-core cable is connected with the direct current test piece, the alternating current test piece and the reference electrode respectively, and the other end is connected with the intelligent acquisition device; The direct current test piece and the alternating current test piece are located outside the hollow probe rod and can contact with the soil during use; The reference electrode comprises a red copper rod, a liquid cavity is arranged on the hollow probe rod, the liquid cavity is filled with saturated copper sulfate solution, the red copper rod is immersed in the saturated copper sulfate solution, a slow-release member is arranged on the cavity wall of the liquid cavity, and the slow-release member is used for slowly penetrating the saturated copper sulfate solution into the soil through the slow-release member, The lower end of the hollow probe rod is provided with a pagoda drill bit during use, and the other end is provided with a rotating handle.

2. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 1, characterized in that, The slow-release member is porous permeable ceramic.

3. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 2, characterized in that, A plurality of through holes and annular grooves are arranged on the cavity wall of the liquid cavity, the through holes and the annular grooves are communicated, and annular porous permeable ceramic is arranged in the annular grooves.

4. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 3, characterized in that, A rubber gasket is arranged between the annular porous permeable ceramic and the side wall of the annular grooves.

5. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 1, characterized by, The direct current coupon is a ring-shaped metal sheet, and the contact area of the direct current coupon with the soil is 1 cm 2 .

6. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 1, characterized in that, The alternating current test piece is a ring-shaped metal piece, and the contact area of the alternating current test piece with the soil is 6.5 cm 2 .

7. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 1, characterized by, The liquid cavity is arranged at the end of the hollow probe rod close to the pagoda drill bit, a plug is arranged between the hollow probe rod and the pagoda drill bit, the plug is detachably connected with the hollow probe rod, and the saturated copper sulfate solution can be added into the liquid cavity after the plug is removed.

8. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 7, characterized in that, The plug and the pagoda drill bit are integrally manufactured.

9. The composite probe for measuring the stray current interference state of a buried pipeline according to claim 1, characterized by, The hollow probe rod comprises a hollow rod body and a connecting piece, the direct current test piece, the alternating current test piece and the reference electrode are mounted on the connecting piece, and the connecting piece is detachably connected with the hollow probe rod.

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