CN103941095A - Method for testing electrical resistivity of earth around underground metallic conduit - Google Patents
Method for testing electrical resistivity of earth around underground metallic conduit Download PDFInfo
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- CN103941095A CN103941095A CN201410199665.XA CN201410199665A CN103941095A CN 103941095 A CN103941095 A CN 103941095A CN 201410199665 A CN201410199665 A CN 201410199665A CN 103941095 A CN103941095 A CN 103941095A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 title abstract description 14
- 239000002689 soil Substances 0.000 claims description 38
- 238000001514 detection method Methods 0.000 abstract description 19
- 238000005536 corrosion prevention Methods 0.000 abstract 3
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012372 quality testing Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to a method for testing the electrical resistivity of earth around an underground metallic conduit, belonging to the technical field of a resistivity test. The method comprises the steps: firstly, installing a grounding electrode rod of a corrosion prevention detector on the surface of the underground metallic conduit, installing a signal transmitter between the underground metallic conduit and the grounding electrode rod, and installing an A-frame and a signal receiver on a position L far away from the grounding electrode rod; secondly, transmitting a current signal through the signal transmitter, and reading a decibel value of the earth voltage drop corresponding to the current signal; thirdly, converting the decibel value to voltage according to a reference voltage numerical value of the corrosion prevention detector; and fourthly, calculating the electrical resistivity of the earth around the underground metallic conduit. According to the method, the existing corrosion prevention detector and a detection field are utilized to simplify the detection process and improve the detection efficiency, so that the working efficiency of the field operation can be improved; meanwhile, the carrying number of wild instruments and equipments can be reduced, and the working intensity of operators can be effectively reduced.
Description
Technical field
The present invention relates to a kind of method that the resistivity of underground metallic conduit surrounding soil is tested, belong to resistivity measurement technical field.
Background technology
The method of testing of existing soil resistivity is a lot, as geology criterion, two-circuit mutual inductance method, self-induction method, coil method, double distribution method and symmetrical four electrode bathymetries etc.As shown in Figure 1, the method is applicable to from earth's surface to the measurement of the degree of depth average soil resistivity that is a its detection principle, measuring principle: by four extremely rod be laid on the straight line on earth's surface, extremely the distance between rod is a.Interference measurement being caused for fear of the metal object of embedded underground, extremely the laying of rod should be as far as possible away from metallic object.Soil resistivity calculates by following formula:
Wherein, ρ is that (m), R (Ω) is resistance to Ω to soil resistivity, resistance value=PV (V)/PA (A), a is the extremely distance between rod (m) for testing, h be test pole rod enter ground the degree of depth (m).
When test pole rod enter ground degree of depth h be no more than utmost point interrod spacing a 1/20 time, can suppose h=0, computing formula can be reduced to:
ρ＝2πaR
Facts have proved, the detection accuracy of symmetrical four electrode bathymetries can meet engineering calculation requirement completely, becomes a kind of conventional method in engineering design.Its shortcoming is, in the time carrying out the quality testing of buried metal pipeline anticorrosive coat, needs the proving installation of extra gear soil resistivity, carries inconvenience, is not suitable for the field work of anticorrosion detection.
Carrying out in the quality testing of underground metallic conduit external anti-corrosion layer, the transmiting signal source of connecting between earthing pole rod and pipeline, transmitter current I is presented on transmiting signal source panel, the instrument detecting is A cabinet frame or two ground-electrodes that are similar to A cabinet frame, is used for detecting the anticorrosive coat breaking point of underground metallic conduit.Detect schematic diagram as shown in Figure 2.In the time carrying out breaking point detection, connect A cabinet frame, A cabinet frame has two earthing pole rods, distance between two earthing pole rods is b, while inserting in ground simultaneously, anticorrosion detector receiver detects the magnitude of voltage U between two earthing pole rods, and numerical values recited is shown as a decibel value, and this decibel value is exactly magnitude of voltage and the fixed reference voltage value U between two earthing pole rods of A cabinet frame
0ratio, the size of this magnitude of voltage is to be presented on anticorrosion detector receiver panel with the form of decibel value, in the both sides of anticorrosive coat breaking point, this magnitude of voltage indicated direction is contrary.This transmitting, reception instrument and equipment are used for carrying out the detection of buried metal pipeline anticorrosive coat, the not measuring ability of soil resistivity.
In pipeline anticorrosion coating detects, in order to calculate accurately the parameters such as anticorrosion layer insulating resistance, need electric resistance of soil rate score, test instrumentation is mainly ZC-8 type ground resistance measuring instrument at present, and field operation scene just need to be used two or more instrument and equipments like this.
Summary of the invention
The object of the invention is to propose a kind of method that the resistivity of underground metallic conduit surrounding soil is tested, make full use of existing anticorrosion detector, do not reducing under the requirement of accuracy of detection, improve detection efficiency, by to the analysis that detects data, directly calculate underground metallic conduit soil resistivity parameter around.
The method that the resistivity to underground metallic conduit surrounding soil that the present invention proposes is tested, comprises the following steps:
(1) the earthing pole rod of anticorrosion detector is arranged on to the earth's surface apart from 20～50 meters of of underground metallic conduit, the signal transmitter of anticorrosion detector is arranged between underground metallic conduit and earthing pole rod, the A cabinet frame of anticorrosion detector and signal receiver are arranged on to the place apart from earthing pole rod L, between A cabinet frame and signal receiver, be connected by signal wire, the distance between two earth points of A cabinet frame is b;
(2) a described current signal I of signal transmitter transmitting;
(3) described signal receiver reads the decibel value dB of the soil voltage drop corresponding with current signal I;
(4) according to the reference voltage numerical value U of anticorrosion detector
0, utilize following formula that decibel value dB is converted to voltage U:
(5), according to above-mentioned current signal I and voltage U, utilize following formula to calculate the resistivity of underground metallic conduit surrounding soil:
ρ＝2πL
2U/(bI)
Wherein: ρ is soil resistivity, L is the distance between A cabinet frame and earthing pole rod, U
0for anticorrosion detector reference voltage numerical value, the decibel value that signal receiver that dB is anticorrosion detector shows, b is the distance between two earth points of A cabinet frame, the current signal I of the signal transmitter transmitting that I is anticorrosion detector.
The method that the resistivity to underground metallic conduit surrounding soil that the present invention proposes is tested, its advantage is: this method is used existing anticorrosion detector and existing Test Field, by to the analysis that detects data, directly calculate underground metallic conduit soil resistivity parameter around.Soil resistivity is an important parameter that characterizes soil corrosivity, this parameter can provide reliable theoretical foundation for design, the production technology etc. of underground metallic conduit, and utilize the inventive method not reducing under the requirement of accuracy of detection, simplify testing process, improve detection efficiency, the work efficiency of field work is improved, reduce field simultaneously and carry instrument and equipment quantity, effectively reduce operating personnel's working strength.
Brief description of the drawings
Fig. 1 utilizes symmetrical four electrode bathymetries to measure the principle schematic of soil resistivity in prior art.
Fig. 2 is the existing detection principle schematic of utilizing anticorrosion detector to detect breaking point on underground metallic conduit.
Fig. 3 is the principle schematic that the resistivity to underground metallic conduit surrounding soil that the present invention proposes is tested.
In Fig. 1-Fig. 3, the 1st, earthing pole rod, the 2nd, underground metallic conduit, the 3rd, signal transmitter, the 4th, A cabinet frame, the 5th, signal receiver.L is the distance between ground-electrode and A cabinet frame, and a is the distance between rod extremely, and b is the distance between two ground-electrodes of A cabinet frame.
Embodiment
The method that the resistivity to underground metallic conduit surrounding soil that the present invention proposes is tested, its test philosophy as shown in Figure 3, comprises the following steps:
(1) the earthing pole rod 1 of anticorrosion detector is arranged on to the earth's surface apart from 20～50 meters of of underground metallic conduit 2, the signal transmitter of anticorrosion detector 3 is arranged between underground metallic conduit 2 and earthing pole rod 1, the A cabinet frame 4 of anticorrosion detector and signal receiver 5 are arranged on to the place apart from earthing pole rod L, between A cabinet frame and signal receiver 5, be connected by signal wire, the distance between two earth points of A cabinet frame is b;
(2) described signal transmitter 3 is launched a current signal I;
(3) above-mentioned current signal I produces voltage drop in the soil around earthing pole rod 1, and described signal receiver 5 reads the decibel value dB of the soil voltage drop corresponding with current signal I;
(4) according to the reference voltage numerical value U of anticorrosion detector
0, utilize following formula that decibel value dB is converted to voltage U:
(5), according to above-mentioned current signal I and voltage U, utilize following formula to calculate the resistivity of underground metallic conduit surrounding soil:
ρ＝2πL
2U/(bI)
Wherein: ρ is that (m), L is the distance (m) between A cabinet frame and earthing pole rod to Ω to soil resistivity, U
0for anticorrosion detector reference voltage numerical value (V), dB is the decibel value that the signal receiver of anticorrosion detector shows, b is the distance (m) between two earth points of A cabinet frame, the current signal I of the signal transmitter transmitting that I is anticorrosion detector.
Reference voltage numerical value U in above-mentioned computing formula
0, for the anticorrosion detector U specifying
0a fixed value, the relational expression between it and known electric potential source U, the decibel value that detects as shown in the formula:
Reference voltage numerical value U
0assay method be: between two earthing pole rods of the signal generator that uses anticorrosion detector to A cabinet frame, input multiple known voltage signals, record different demonstration decibel values, just can obtain the fixed reference voltage value U of this anticorrosion detector according to least square fitting
0.
The method that the resistivity to underground metallic conduit surrounding soil that the present invention proposes is tested, only top (in several meters) soil to underground metallic conduit place is measured, and does not consider that the deep layer of soil resistivity changes.
In pipeline anticorrosion coating detects, in order to calculate the parameter such as anticorrosion layer insulating resistance accurately, need electric resistance of soil rate score, test instrumentation is mainly ZC-8 type ground resistance measuring instrument at present, field operation scene need to be used two or more instrument and equipments like this, in order to make full use of existing instrument, do not reducing under the requirement of accuracy of detection, improve detection efficiency, existing pipeline corrosion protection detector relevant device is furtherd investigate and developed, by detecting, directly calculate the soil resistivity parameter of Test Field
The anticorrosion detector that the inventive method is used, can be Radiodetection Limited (Radiodetection) RD ?the outer anticorrosion detector of PCM buried pipeline, the DM pipeline corrosion protection detector of Vivax ?Metrotech company of the U.S., or the instrument such as the bright sharp SL ?5808PCM pipeline corrosion protection detector of Jiangsu Province, China Sheng Li detection instrument company limited.
The inventive method is utilized existing anticorrosion detector, and these instruments all have this function of detection, and the equipment of utilization is all A cabinet frame, and its single anticorrosive coat breaking point function is developed, and makes it have the test function of soil resistivity.In the time carrying out breaking point detection, connect A cabinet frame, instrument is shown as some decibel values, and A cabinet frame has two earthing pole rods, and this decibel value is exactly that A cabinet frame has two magnitude of voltage and fixed reference voltage value U between earthing pole rod
0ratio.By using signal generator to have between two earthing pole rods and input multiple known voltage signals to A cabinet frame, record different demonstration decibel values, just can obtain the fixed reference voltage value U of this instrument according to least square fitting
0.If instrument producer provides this numerical value, this step is confirmation process.
Below introduce an embodiment of the inventive method:
Taking the PCM+ of Radiodetection Limited as example, the minimum transmitter current of anticorrosion detector is 100mA, 1.5 meters of buried depth of pipeline, excellent 3 meters apart from earthing pole of A cabinet frames, fixed reference voltage value be after testing 1e ?6 volts, 0.54 meter of the spacing of two ground-electrodes of A cabinet frame, detection decibel value is 96dB, calculating soil resistivity according to Computer Corp. of above-mentioned soil resistivity is 66.04 Ω m.
Claims (1)
1. a method of the resistivity of underground metallic conduit surrounding soil being tested, is characterized in that the method comprises the following steps:
(1) the earthing pole rod of anticorrosion detector is arranged on to the earth's surface apart from 20～50 meters of of underground metallic conduit, the signal transmitter of anticorrosion detector is arranged between underground metallic conduit and earthing pole rod, the A cabinet frame of anticorrosion detector and signal receiver are arranged on to the place apart from earthing pole rod L, between A cabinet frame and signal receiver, be connected by signal wire, the distance between two earth points of A cabinet frame is b;
(2) a described current signal I of signal transmitter transmitting;
(3) described signal receiver reads the decibel value dB of the soil voltage drop corresponding with current signal I;
(4) according to the reference voltage numerical value U of anticorrosion detector
0, utilize following formula that decibel value dB is converted to voltage U:
(5), according to above-mentioned current signal I and voltage U, utilize following formula to calculate the resistivity of underground metallic conduit surrounding soil:
ρ＝2πL
2U/(bI)
Wherein: ρ is soil resistivity, L is the distance between A cabinet frame and earthing pole rod, U
0for anticorrosion detector reference voltage numerical value, the decibel value that signal receiver that dB is anticorrosion detector shows, b is the distance between two earth points of A cabinet frame, the current signal I of the signal transmitter transmitting that I is anticorrosion detector.
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| CN201410199665.XA CN103941095B (en) | 2014-05-13 | 2014-05-13 | A kind of method that the resistivity of underground metallic conduit surrounding soil is tested |
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| CN201410199665.XA CN103941095B (en) | 2014-05-13 | 2014-05-13 | A kind of method that the resistivity of underground metallic conduit surrounding soil is tested |
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| CN103941095B CN103941095B (en) | 2016-05-04 |
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Cited By (4)
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| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
| CN106353825A (en) * | 2016-10-28 | 2017-01-25 | 南京信息工程大学 | Detection system for underground metallic pipeline |
| CN109296946A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | Method and device for determining insulation resistivity of outer anticorrosive coating of underwater crossing section of pipeline |
| CN114993928A (en) * | 2022-05-26 | 2022-09-02 | 徐州中矿传动轨道科技有限公司 | Buried pipeline coating defect positioning device and method under stray current corrosion |
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| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
| CN104090169B (en) * | 2014-06-25 | 2016-08-17 | 河海大学 | A kind of measure the method for ground network ground resistance in domatic stratified soil structure |
| CN106353825A (en) * | 2016-10-28 | 2017-01-25 | 南京信息工程大学 | Detection system for underground metallic pipeline |
| CN106353825B (en) * | 2016-10-28 | 2018-04-03 | 南京信息工程大学 | A kind of underground metal pipes detection system |
| CN109296946A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | Method and device for determining insulation resistivity of outer anticorrosive coating of underwater crossing section of pipeline |
| CN114993928A (en) * | 2022-05-26 | 2022-09-02 | 徐州中矿传动轨道科技有限公司 | Buried pipeline coating defect positioning device and method under stray current corrosion |
| CN114993928B (en) * | 2022-05-26 | 2024-04-19 | 徐州中矿传动轨道科技有限公司 | Buried pipeline coating defect positioning device and method under stray current corrosion |
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| CN103941095B (en) | 2016-05-04 |
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