Soil resistivity tester for buried pipeline inspection
By designing a soil resistivity tester with retractable fixed plates and probe clips, the wire connection and accuracy problems in the prior art are solved, and efficient and accurate soil resistivity testing is achieved, eliminating mutual inductance interference of wires.
Patent Information
- Application Number
- CN202420274074.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-02-04
AI Technical Summary
Existing soil resistivity testers need to connect and recover conductors, resulting in low working efficiency and failure to accurately determine the electrode spacing and depth of the soil, which affects the accuracy of the test, and the mutual inductance of the conductors affects the results.
A tester including a soil resistivity test body and a fixed plate is designed. The fixed plate is retractable on the left and right sides, and a probe clip and a conductive rod are installed. The pipe position is determined through an electromagnetic sensor. The probe clip clamps the conductive rod and the conductive rod are clamped. The sheet contact forms a loop to ensure accurate electrode spacing and soil depth and avoid mutual inductance interference of the conductors.
It improves the testing work efficiency, ensures the accuracy of electrode spacing and soil-burning depth, eliminates mutual inductance interference in conductors, and improves the accuracy of test results.
Smart Images
Figure CN222337101U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of buried pipeline inspection, in particular to a soil resistivity tester for buried pipeline inspection. Background Art
[0002] Soil resistivity is the electrochemical characteristic parameter of the soil and groundwater system. It is the most comprehensive parameter to characterize soil corrosion performance. It can comprehensively reflect the corrosion characteristics of the soil environment in a certain area. Therefore, soil resistivity can be used as one of the important conditions for evaluating the stray current corrosion of buried pipelines. Soil resistivity testing is an important test item for buried pipeline inspection. Its testing methods mainly include soil sample analysis method, electromagnetic detection method, two-electrode method, three-electrode method and four-electrode method. Among them, the four-electrode method is suitable for testing a wide range of soil resistivity, so it is more suitable for soil resistivity testing for buried pipeline inspection.
[0003] The equidistant method in the four-electrode method uses a ground resistance tester to arrange four electrodes in a straight line. The distance between the two adjacent electrodes on the inner side is equal to the buried depth of the pipeline in the soil to be tested, and the distance between the electrodes on both sides and the adjacent electrodes is equal to the distance between the two adjacent electrodes on the inner side. The depth of the electrode into the soil should be less than one twentieth of the buried depth, and its resistivity is calculated according to the formula specified in Appendix A of GB / T19285. This method is suitable for testing the average soil resistivity of soil depths less than 20 meters. For cases not less than 20 meters, the unequal distance method is used, but usually the pipeline is buried less than 20 meters. The current test process is to connect the four electrodes to the instrument through connecting wires, and after the test is completed, the connecting wires need to be wound and recovered, so the work is cumbersome and the work efficiency is low. In addition, the distance between the electrodes and the depth of the electrodes into the soil are determined by the buried depth of the pipeline, but the current test is not arranged according to the actual depth, so the accuracy of the test cannot be guaranteed. The mutual inductance interference between the wires can also easily affect the accuracy of the test results. Summary of the invention
[0004] In order to overcome the above problems, the purpose of the utility model is to provide a soil resistivity tester for buried pipeline inspection, which overcomes the inconvenience caused by the need to connect and recycle wires in current testing instruments and improves the working efficiency of the test.
[0005] The utility model is implemented by the following scheme: a soil resistivity tester for inspecting buried pipelines, comprising a soil resistivity test body, the device also comprising a fixed plate, the soil resistivity test body is mounted on the fixed plate, at least two telescopic plates are telescopically arranged on both sides of the fixed plate, one of the two telescopic plates is sleeved in the fixed plate, the second telescopic plate of the two telescopic plates is sleeved in the first telescopic plate, the first telescopic plate and the second telescopic plate are respectively provided with a first guide rail groove and a second guide rail groove, and the inner diameter of the second guide rail groove is larger than the inner diameter of the first guide rail groove; the inner side walls of the first guide rail groove and the second guide rail groove are both concave inwardly A groove is formed by sinking, and scales are marked on both sides of the telescopic plate one and the telescopic plate two. Probe clamps are installed in the first guide rail groove and the second guide rail groove, and the two clamping arms of the probe clamp are embedded in the groove. Two conductive rods extend outward on both sides of the hinged part of the probe clamp, and the two conductive rods can be expanded or tightened with the two clamping arms. Conductive sheets are installed in the grooves of the first guide rail groove and the second guide rail groove, and the conductive sheets are connected to the soil resistivity test body. The probe clamp clamps the probe so that the conductive rods on both sides are expanded and contacted with the conductive sheets on both sides to form a loop. The probe clamp releases the probe so that the conductive rods on both sides are tightened and separated from the conductive sheets on both sides to achieve circuit breaking.
[0006] Furthermore, an electromagnetic sensor is installed at the bottom of the fixing plate, and the electromagnetic sensor is electrically connected to the soil resistivity test body.
[0007] Furthermore, two receiving holes for receiving probes are provided on both sides of the fixing plate.
[0008] The beneficial effects of the utility model are as follows: the utility model is a new instrument device for testing soil resistivity in buried pipeline inspection projects, which effectively overcomes the inconvenience caused by the need to connect and recycle wires in the currently used test instruments, improves the test efficiency, and eliminates the influence of wire mutual inductance on the test results. In addition, the device can provide the actual buried depth of the pipeline, so that the spacing between electrodes and the depth of electrodes buried in the soil can be accurately determined, and the test accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 This is a top view of the first embodiment of the utility model.
[0010] Figure 2 This is a bottom view of the first embodiment of the present utility model.
[0011] Figure 3 This is a schematic diagram of the structure of the first embodiment of the utility model when in use.
[0012] Figure 4 for Figure 3 Enlarged view of point A in the clamping state of the conductive clip.
[0013] Figure 5 yes Figure 4 Schematic diagram of the conductive clip in the unclamped state. DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with the accompanying drawings.
[0015] See also Figures 1 to 5 As shown, the first embodiment of the utility model is a soil resistivity tester for buried pipeline inspection, including a soil resistivity test body 1, the device also includes a fixed plate 2, the soil resistivity test body 1 is installed on the fixed plate 2, and at least two telescopic plates are telescopically arranged on both sides of the fixed plate 2, the telescopic plate 1 3 of the two telescopic plates is sleeved in the fixed plate 2, the telescopic plate 2 4 of the two telescopic plates is sleeved in the telescopic plate 1 3, and so on. Among them, the number of telescopic plates can be increased according to specific circumstances, and the entire plate length can be up to 30 meters when unfolded, but usually for the convenience of carrying, the number of telescopic plates is suitable to meet the requirements. The telescopic plate 1 3 and the telescopic plate 2 4 are respectively provided with a first guide groove 31 and a second guide groove 41, and the inner diameter of the second guide groove 41 is larger than the inner diameter of the first guide groove 31; the inner side walls of the first guide groove 31 and the second guide groove 41 are both recessed inward to form a groove 32, and scales 34 are marked on both sides of the telescopic plate 1 3 and the telescopic plate 2 4, and the first guide groove 31 and the second guide groove 41 are both installed with a probe clamp 5, and the two clamp arms 51 of the probe clamp 5 are embedded in the groove, and the probe clamp 5 There are two conductive rods 53 extending outward on both sides of the hinge 52, and the two conductive rods 53 can be expanded or tightened with the two clamp arms 51. The first guide groove 31 and the second guide groove 41 are both equipped with conductive sheets 33, which are connected to the soil resistivity test body 1. The probe clamp 5 clamps the probe 6 so that the conductive rods 53 on both sides are expanded and contact the conductive sheets on both sides to form a loop. The probe clamp 5 releases the probe 6 so that the conductive rods 53 on both sides are tightened and separated from the conductive sheets 33 on both sides to achieve a circuit break. The soil resistivity test body 1 is the body of the ECTR3000B ground resistance soil resistivity tester, which is already the prior art and the internal structure is not described in detail here.
[0016] In addition, in the present invention, an electromagnetic sensor 21 is installed at the bottom of the fixing plate 2, and the electromagnetic sensor 21 is electrically connected to the soil resistivity test body. Two receiving holes 22 for receiving the probes 6 are opened on both sides of the fixing plate 2.
[0017] During the test, first place the tester near the pipeline to be tested, determine the position of the pipeline by inducing electromagnetic signals through the electromagnetic sensor on the tester, adjust the tester and place it directly above the pipeline, and test to obtain the actual buried depth of the pipeline. After determining the buried depth, take out 4 probes from the storage holes on both sides of the tester fixing plate, and pull out telescopic plate 1 and telescopic plate 2. The position of the probe insertion is determined by the standard scale on telescopic plate 1 and the scale of telescopic plate 2. The spacing between the two inner probes is equal to the buried depth, and the spacing between the adjacent probes is equal to the buried depth; the depth of the probe into the soil should be less than one twentieth of the buried depth. After the 4 probes are inserted into the corresponding positions, the probe clamp clamps the probes, and at this time, the conductive rods 53 on both sides are stretched open to contact the conductive sheets on both sides to form a loop. When the clamp is released, the conductive rods are separated from the two sides of the guide rails as the angle of separation is separated, thereby achieving a circuit break. The advantage of the probe contacting both sides at the same time is to ensure the energized circuit. In addition, the lines connected to the soil resistivity test body 1 by the guide rails of the two telescopic plates are independent of each other, thereby avoiding interference caused by mutual inductance of the wires. After the tester is connected, the soil resistivity value is directly read through the display screen of the soil resistivity test body 1. After the test is completed, turn off the soil resistivity test body 1 system, loosen the probe clamp, pull out the probe and insert it into the probe storage hole, retract the telescopic plate, and complete the test.
[0018] In short, the utility model is a new instrument device for testing soil resistivity in buried pipeline inspection projects, which effectively overcomes the inconvenience caused by the need to connect and recycle wires in the currently used test instruments, improves the test efficiency, and eliminates the influence of wire mutual inductance on the test results. In addition, the device can provide the actual buried depth of the pipeline, so it can accurately determine the spacing between electrodes and the depth of electrodes buried in the soil, and the test accuracy is higher.
[0019] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.
Claims
1. A soil resistivity tester for buried pipeline inspection, comprising a soil resistivity test body, characterized in that: The soil resistivity tester for underground pipeline inspection also includes a fixed plate, the soil resistivity test body is installed on the fixed plate, at least two telescopic plates are telescopically arranged on both sides of the fixed plate, one of the two telescopic plates is sleeved in the fixed plate, and the telescopic plate 2 of the two telescopic plates is sleeved in the telescopic plate 1, the telescopic plate 1 and the telescopic plate 2 are respectively provided with a first guide rail groove and a second guide rail groove, and the inner diameter of the second guide rail groove is larger than the inner diameter of the first guide rail groove; the inner side walls of the first guide rail groove and the second guide rail groove are both recessed inward to form a groove, and the telescopic plate 1 and the telescopic plate The two sides are marked with scales, and probe clamps are installed in the first guide rail groove and the second guide rail groove, and the two clamping arms of the probe clamp are embedded in the grooves, and two conductive rods extend outward on both sides of the hinged part of the probe clamp, and the two conductive rods can be expanded or tightened with the two clamping arms, and conductive sheets are installed in the grooves of the first guide rail groove and the second guide rail groove, and the conductive sheets are connected to the soil resistivity test body. The probe clamp clamps the probe so that the conductive rods on both sides are expanded and contacted with the conductive sheets on both sides to form a loop, and the probe clamp releases the probe so that the conductive rods on both sides are tightened and separated from the conductive sheets on both sides to achieve disconnection.
2. The soil resistivity tester for buried pipeline inspection according to claim 1, characterized in that: An electromagnetic sensor is installed at the bottom of the fixing plate, and the electromagnetic sensor is electrically connected to the soil resistivity test body.
3. The soil resistivity tester for buried pipeline inspection according to claim 1, characterized in that: Two receiving holes for receiving probes are provided on both sides of the fixing plate.