CN106641741B - A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection - Google Patents
A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection Download PDFInfo
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- CN106641741B CN106641741B CN201611197391.6A CN201611197391A CN106641741B CN 106641741 B CN106641741 B CN 106641741B CN 201611197391 A CN201611197391 A CN 201611197391A CN 106641741 B CN106641741 B CN 106641741B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The present invention relates to a kind of device and method of the breaking point of the outer wall erosion resistant coating of super buried depth pipeline of detection.The inventive system comprises transmitters, are electrically connected to pipeline；Two rapiers, each rapier have elongated, hollow main body, and one end of main body is with probe and the other end has lever, connector is provided on lever, probe is electrically connected in the intracorporal conducting wire of master with connector by setting；Detector, including power supply unit, input protection unit, gain adjustment unit, magnification processing, noise reduction filtering unit, single-chip microcontroller processing unit and display unit；Wherein the input terminal of input protection unit is electrically connected with the connector of rapier, and output end, gain adjustment unit, magnification processing, noise reduction filtering unit, single-chip microcontroller processing unit, the display unit of input protection unit are sequentially connected electrically.Apparatus and method of the present invention can quickly and accurately determine the position of breaking point.
Description
Technical field
The invention belongs to underground piping detection technology fields, and in particular to a kind of outer wall for detecting super buried depth pipeline is anti-
The device and method of the breaking point of rotten layer.
Background technique
With the rapid development of China's oil chemical industry and the raising of urban public utilities construction speed, underground metal pipes
Construction is also in development at full speed.But meanwhile underground metal pipes are also often subject to the corrosion of various harmful substances, the corrosion of pipeline
The problem of bringing huge economic loss and social safety to bring to the mankind and social environment becomes increasingly conspicuous.Therefore, for conveying
It respectively is required to be protected with the steel pipe of medium, avoids various corrosion factors in soil, compound ions, bacterium, is conducive to electricity
Road passes through the various conditions of pipeline or the corrosion of stray electrical current etc..In practical applications, the additional erosion resistant coating protection of steel pipe
It is most common method.Electrochemical corrosion of the protective conduit outer wall from soil media, the purpose of bacterial corrosion.Buried pipeline is anti-
There is aging, embrittlement, removes, falls off, eventually leading to Metal pipeline corrosion perforation, draw since factors cause to deteriorate in rotten layer
Play leakage.Erosion resistant coating deterioration is also the same to influence cathodic protection efficiency, because metallic conduit and the earth are without cease after erosion resistant coating deterioration
Edge, protective current scatter and disappear, and guard space will shorten, and the pipeline that cannot be protected is caused to be corroded.Therefore, anti-to underground piping
Rotten layer status periodical evaluation, and it is planned carry out leak detection and leak repairing be prevention and avoid because erosion resistant coating deteriorate due to cause pipeline corruption
The important means of erosion is exactly both at home and abroad in recent years human body using more method in conventional buried depth pipeline anticorrosion coating detection field
The methods of capacitance method, ACVG, DCVG achieve preferable effect.But with the rapid development of no-dig technique Directional Drilling Technology, mesh
The preceding underground utilities using Directional Drilling construction are more and more, and buried depth is also deeper and deeper, the pipeline of river crossing, highway
Now with buried depth have reached even more than 30 meters, so deep pipeline external anti-corrosion layer detection above method detection effect is not
It is ideal.
In super buried depth pipeline anticorrosion coating detection field, existing erosion resistant coating breaking point detection is all made of between two rapiers of detection
Potential differentiation, that is, erosion resistant coating breaking point is identified by the size of signal strength.If increasing distance between two rapiers, current potential
Difference will increase, but be susceptible to the influence of ground surface environment factor, increases by two rapiers and increases apart from rear potential difference, but if
The presence of the environmental conditions such as medium difference, signal not necessarily just have greatly in two test point surface soil humidity differences, soil
Erosion resistant coating breaking point, it is also possible to caused by environmental condition, erosion resistant coating breaking point be easy to cause to judge by accident.
Therefore, it is necessary to a kind of more accurate convenient method and apparatus of outer wall erosion resistant coating breaking point for detecting underground piping.
Summary of the invention
It is an object of the present invention to provide a kind of devices of the breaking point of the outer wall erosion resistant coating of super buried depth pipeline of detection.
It is a further object to provide a kind of methods of the breaking point of the outer wall erosion resistant coating of super buried depth pipeline of detection.
In one aspect, the device of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection provided by the invention includes hair
Emitter is electrically connected to the underground piping；Two rapiers, each rapier have elongated, hollow main body, the main body
One end is with probe and the other end has lever, connector is provided on the lever, the probe is by being arranged described
Main intracorporal conducting wire is electrically connected with the connector；Detector, including power supply unit, input protection unit, gain adjustment unit,
Magnification processing, noise reduction filtering unit, single-chip microcontroller processing unit and display unit；Wherein the input protection unit is defeated
Enter end to be electrically connected with the connector of the rapier, the output end of the input protection unit, the gain adjustment unit, institute
Magnification processing, the noise reduction filtering unit, the single-chip microcontroller processing unit, the display unit is stated to be sequentially connected electrically.
In the present invention, term " super buried depth pipeline " is often referred to be imbedded in 10-40 meters of subsurface or so of pipeline and pipeline
Outer wall is coated with erosion resistant coating.
In the present invention, it is in the low of frequency multiplication relationship that transmitter, which is used to apply simultaneously to pipe under test one group of high-frequency and two groups,
The mixed frequency AC signal of frequency can use a variety of transmitters commonly used in the art.
In the present invention, high-frequency is often referred to the frequency not less than 128Hz, such as 128Hz, 512Hz, 1024Hz, applies
One group of high-frequency be commonly used in determining that stationary singnal determines suitable detection interval etc..
In the present invention, two groups of application are used to determine electric current based on phase-comparison circuit in the low frequency of frequency multiplication relationship
Direction.In the present invention, usual high-frequency is low-frequency 10-300 times.In the present invention, it is closed in frequency multiplication for illustrative two groups
The low frequency of system can be 4Hz+8Hz, 3Hz+6Hz, 5Hz+10Hz etc..
The high-frequency of application and low-frequency size can be selected according to field condition.
Selectively, the frequency signal of application can be the waveform signals such as sine wave, square wave, sawtooth wave.
The frequency size and testing result relationship of application are little, are only different live geographical environment, the difficulty that signal applies
Easy degree is different, and signal transmission distance is also different.
In the present invention, detector is used to detect the potential difference between two probes, is indicated by dB value.
Stationary singnal is often referred to potential difference less than 50mV.
Optionally, probe is acicular.
Optionally, probe is metal probe.
Optionally, the other end of main body has screw thread, to be threadedly coupled with the lever.Optionally, main body with
Probe becomes one.
Optionally, power supply unit provides electric power for other each units in the device of the invention；Input protection unit is used for
Voltage-limiting protection is carried out to the collected current signal of institute；The gain adjustment unit be used for the current signal after voltage-limiting protection into
Row gain adjustment；The magnification processing is for amplifying processing to the current signal after gain adjustment；The noise reduction filter
Wave unit is used to carry out noise reduction and filtering processing to amplified signal.
Optionally, single-chip microcontroller processing unit is based on phase-comparison circuit.
Optionally, display unit includes current direction direction display unit and signal magnitude display unit.Optionally, two
Unit is liquid crystal display or light emitting diode.
Optionally, the unit of display is individual unit, while can show current direction and signal magnitude.
On the other hand, the breaking point of the outer wall erosion resistant coating provided by the invention that super buried depth pipeline is detected using above-mentioned apparatus
Method include the following steps:
Step a: apply three groups of signals simultaneously to the pipeline, one group is high-frequency signal, and another two groups is in frequency multiplication relationships
Low frequency signal；
Step b: being connected to the detector for two rapiers and be inserted into the soil of top of the pipeline, measures edge
The potential difference between two rapiers of the longitudinal direction of the pipeline；
Step c: the distance between two rapiers are adjusted to determine stationary singnal based on the high-frequency signal of application, setting reaches
The distance between two rapiers when stationary singnal are detection interval；
Step d: after two groups of low frequency signals in frequency multiplication relationship are amplified, are filtered, will wherein more low-frequency signal into
Row frequency multiplication amplifies to obtain the identical signal of two frequencies, is input to the phase that respective signal is identified in phase-comparison circuit and progress
Compare, if two signal phases are identical, shows current direction forward；If 180 ° of the phase phase difference of two signals, table
Bright current direction is backward；
Step e: based on the current direction and the potential difference detected, using the detection interval as step pitch along
Mobile two probes of the longitudinal direction of the pipeline, until detecting the breaking point.
Optionally, in the step d, when the current direction forward when show the breaking point in the detection interval
Front；When the current direction backward when show the breaking point at the rear of the detection interval.
Optionally, in the step e, when the breaking point is not present in the detection interval, the potential difference
Remain essentially in the stationary singnal；Show the detection interval close to the breakage when the potential difference increases
Point；When being reduced to close to zero after potential difference increase again, then the middle position of the detection interval is the breaking point.
It the work of the device of the invention and is summarized as follows using principle:
Single-chip microcontroller processing unit be based on phase-comparison circuit, i.e., transmitter apply two groups in frequency multiplication relationship (such as 4Hz and
8Hz；3Hz and 6Hz) frequency signal；After two groups of signals are amplified, filtered, will wherein more low-frequency signal (such as 4Hz) it carry out
Frequency multiplication amplifies to obtain the signal of two frequencies identical (being such as 8Hz), is input to the phase that phase-comparison circuit identifies respective signal
Position is simultaneously compared, if two signal phases are identical, display is indicated forward；If the phase phase difference of two signals
180 °, then display indicates backward.
In use, transmitter applies the AC signal of one group of high-frequency and two groups of low-frequency mixed frequencies, two rapiers
It being inserted into soil and acquires signal, signal is after input protection unit carries out voltage-limiting protection, after gain adjustment, amplification, into
Row noise reduction and filtering processing, after single-chip microcontroller processing unit processes, the level intensity and current direction of signal, i.e. potential difference
It is shown in the display with arrow and dB value with the direction of erosion resistant coating breaking point.
" forward direction " arrow this show erosion resistant coating breaking point in the front of detection interval；" backward " arrow shows erosion resistant coating breakage
Point is at the rear of detection interval, it is possible thereby to determine the direction of erosion resistant coating breaking point.
Level intensity reflects how far of the detection interval apart from erosion resistant coating breaking point, and detection interval is broken apart from erosion resistant coating
Damage point is closer, and level intensity is higher, conversely, detection interval is remoter apart from erosion resistant coating breaking point, level intensity is lower.In erosion resistant coating
Breaking point two sides, current direction is exactly the opposite, therefore the accurate positioning of erosion resistant coating breaking point may be implemented.
Compared with the prior art, the current direction of the invention based between two rapiers identifies erosion resistant coating breaking point
Advantage is:
1, used device and operating method be simple, strong antijamming capability, sensitivity and precision it is high, hardly by earth's surface
The influence of the humidity of environment and soil.
2, the position of erosion resistant coating breaking point is quickly and accurately determined.
3, used measurement method and device, except the detection for being effectively applicable to super buried depth pipeline anticorrosion coating breaking point,
Suitable for conventional buried depth pipeline, the scope of application is wider.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is test schematic diagram of the invention；
Fig. 2 is the rapier structural schematic diagram of apparatus of the present invention；
Fig. 3 is the electrical schematic block diagram of detector of the present invention.
In Fig. 1-3,1 it is Target pipe, 2 is erosion resistant coating breaking point, 3 is rapier, 4 is connecting cable, 5 is detector；3-1
For based on probe, 3-2,3-3 be conducting wire, 3-4 is lever, 3-5 is connector；5-1 is power supply unit, 5-2 input protection list
Member, 5-3 gain adjustment unit, 5-4 magnification processing, 5-5 noise reduction filtering unit, 5-6 single-chip microcontroller processing unit, 5-7 electric current
Direction instruction display unit, 5-8 are signal magnitude display unit.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those skilled in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall in the protection scope of this application.
Below with reference to the accompanying drawings 1-3 detects pipeline outer wall corrosion failure point using the device of the invention to be illustratively described
Method.
First with the cable line terminals drawn on the test pile of buried pipeline from pipeline tube body, transmitter is connected, gives target
Pipeline applies two groups of ac signals of one group of high-frequency (such as 512Hz) and two groups of low frequencies (such as 4Hz+8Hz) simultaneously.
Two rapiers are used alone, and along the duct orientation soil spaced apart being inserted into above pipeline and are connected to
Detector.Using the high-frequency signal of application, the spacing confirmation stationary singnal size of two rapiers is adjusted.When stationary singnal is stablized
Afterwards, it is longitudinally detected using the distance between two rapiers at this time as step pitch along pipeline.
After the sine wave signal of the low frequency (4Hz+8Hz) of application is amplified, is filtered, will more low-frequency signal (such as
It 4Hz) carries out frequency multiplication to amplify to obtain the signal of two frequencies identical (being such as 8Hz), it is respective to be input to phase-comparison circuit identification
The phase of signal is simultaneously compared, if two sine wave signal phases are identical, the electric current in display unit in display pipes
Forward, to be indicated by means of an arrow；If 180 ° of the phase phase difference of two sine wave signals, the electricity in display unit in display pipes
Stream is backward, to be indicated by means of an arrow.The potential difference between two rapiers, unit dB are also shown in the display unit of detector.
When arrow is longitudinally directed to front along pipeline, illustrate erosion resistant coating breaking point in the front of detection interval, when arrow edge
When pipeline is longitudinally directed to rear, illustrate erosion resistant coating breaking point at the rear of detection interval.
There is no the position of breaking point in pipeline anticorrosion coating, it is big to be kept substantially stationary singnal for the potential difference between two rapiers
It is small constant, when between two rapiers detected potential difference increase when, illustrate detection interval at a distance from erosion resistant coating breaking point
Reduce, i.e., detection interval is close to erosion resistant coating breaking point.
When being reduced to close to zero after the potential difference of two interpolars detected increases again, illustrate detection interval and erosion resistant coating
Breaking point is overlapped, i.e. the intermediate point of detection interval is exactly the position of erosion resistant coating breaking point.
From potential difference smallest point continuation detect forward, potential difference becomes larger detect a distance after and fall back to close to quiet
State signal.When detecting erosion resistant coating breaking point again, the potential difference between two rapiers increases again.
The above description is only an example of the present application, is not intended to limit this application.For those skilled in the art
For, various changes and changes are possible in this application.All any modifications made within the spirit and principles of the present application are equal
Replacement, improvement etc., should be included within the scope of the claims of this application.
Claims (4)
1. a kind of method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection, which is characterized in that it uses a kind of detection
Device, the detection device include:
Transmitter is electrically connected to pipeline；
Two rapiers, each rapier have elongated, hollow main body, and one end of the main body has probe and the other end has
There is lever, connector is provided on the lever, the probe is by being arranged in the intracorporal conducting wire of the master and the connector
Electrical connection；
Detector, including power supply unit, input protection unit, gain adjustment unit, magnification processing, noise reduction filtering unit,
Single-chip microcontroller processing unit and display unit；
Wherein the input terminal of the input protection unit is electrically connected with the connector of the rapier, the input protection unit
Output end, the gain adjustment unit, the magnification processing, the noise reduction filtering unit, single-chip microcontroller processing it is single
First, the described display unit is sequentially connected electrically；
Wherein the single-chip microcontroller processing unit is based on phase-comparison circuit；
Wherein the display unit shows current direction and signal magnitude simultaneously；
The method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection includes the following steps:
Step a: apply three groups of signals simultaneously to the pipeline, one group is high-frequency signal, and another two groups is in the low frequencies of frequency multiplication relationship
Signal；
Step b: being connected to the detector for two rapiers and be inserted into the soil of top of the pipeline, measures along institute
State the potential difference between two rapiers of the longitudinal direction of pipeline；
Step c: the distance between two rapiers are adjusted based on the high-frequency signal of application to determine stationary singnal, setting reaches static
The distance between two rapiers when signal are detection interval；
Step d: it after two groups of low frequency signals in frequency multiplication relationship are amplified, filtered, will wherein more low-frequency signal carry out again
Frequency amplification obtains the identical signal of two frequencies, is input to the phase for identifying respective signal in phase-comparison circuit and is compared
Compared with showing current direction forward if two signal phases are identical；If 180 ° of the phase phase difference of two signals, shows
Current direction is backward；
Step e: being step pitch along described using the detection interval based on the current direction and the potential difference detected
Mobile two probes of the longitudinal direction of pipeline, until detecting the breaking point.
2. the method as described in claim 1, which is characterized in that the probe is acicular.
3. the method as described in claim 1, wherein in the step d, when the current direction forward when show it is described broken
Damage point is in the front of the detection interval；When the current direction backward when show the breaking point after the detection interval
Side.
4. the method as described in claim 1, wherein in the step e, when there is no the breakages in the detection interval
When point, the potential difference remains essentially in the stationary singnal；Show the detection zone when the potential difference increases
Between close to the breaking point；When being reduced to close to zero after potential difference increase again, then the centre of the detection interval
Position is the breaking point.
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| CN112287589B (en) * | 2020-11-10 | 2022-08-16 | 厦门华润燃气有限公司 | Finite element positioning method for buried steel pipeline anticorrosive coating damage point |
| CN113983361B (en) * | 2021-09-15 | 2023-02-03 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
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