CN209673703U - Drag-line corrosion monitor - Google Patents
Drag-line corrosion monitor Download PDFInfo
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- CN209673703U CN209673703U CN201821616484.2U CN201821616484U CN209673703U CN 209673703 U CN209673703 U CN 209673703U CN 201821616484 U CN201821616484 U CN 201821616484U CN 209673703 U CN209673703 U CN 209673703U
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Abstract
The utility model provides a kind of drag-line corrosion monitor, including corrosion monitoring sensor 1, sensor stand 2, readout instrument 3, the corrosion monitoring sensor 1 is mounted at anchor head or drag-line by sensor stand 2, readout instrument 3 is connect with corrosion monitoring sensor 1, collected data are shown into corrosion data by readout instrument 3, obtain corrosion rate.The utility model sensor is placed in guy system, in environment identical at drag-line, is not influenced by external force or environmental change, and be convenient for changing corrosion sensor, is not destroyed to drag-line itself, realizes non-destructive testing.
Description
Technical field
The utility model relates to a kind of corrosion monitor more particularly to a kind of drag-line corrosion monitors.
Background technique
Drag-line is the important component of arch bridge, cable-stayed bridge and suspension bridge, as the important primary structure member of bridge, is used
Safe operation and service life of the situational relationship to structure.Since drag-line is exposed in natural environment for a long time, cumulative damage master
If fatigue and corrosion.Fracture and corrosion for steel wire in suspension cable or sunpender, anchor head situation of drag-line etc. can only lead at present
After crossing opening, relies on macroscopic appearance inspection and physical chemistry test is combined and checked.
Line structure Damage of Corroded detection in recent years has with monitoring method: (1) manual method: mainly inspection cable system is
No to be corroded, whether each fastener loosens, and whether cable body has breakage.Advantage is can qualitatively macroscopic examination；The disadvantage is that detection
Take manpower and material resources, examination scope is limited and testing result can only be used to qualitative evaluation, and difficulty meets quantitative assessment requirement, to sudden
Accident cannot achieve detection in time and monitoring.(2) ultrasonic method: being mainly used to detect parallel steel wire face crack, rust hole, but
Since cable is made of more parallel steel wires or steel strand wires, cross sectional shape is complicated, Damage of Corroded position is uncertain, and ultrasonic wave is only
Surface defect can be detected, in addition, anchor head position is complex-shaped, there are biggish blind areas for ultrasound examination.(3) line method is radiated:
It can detecte cable internal injury and defect, can accurately obtain corrosion and fracture of wire equivalent damage inside cable body cable body, disadvantage
It is to shield the radiation to human body, x-ray apparatus is often larger, is not suitable for real-time monitoring.(4) electrochemical method: electrochemistry
Method is owed mainly for single steel bar its detection effect of cable that perhaps steel strand wires form more parallel steel wires or steel strand wires
It is good, a possibility that especially present assessment method substantially judges the corrosion of cable according to the range of potential difference, but tested person
The influences such as regional area environmental factor such as temperature, humidity are significant.(5) supersonic guide-wave method: the country also has research based on ultrasound at present
The monitoring steel bar corrosion method of guided wave theory, but this method is the reinforcing bar for full-scale length, is not a kind of sensor
Product, when in concrete, there are guided wave signals leakage, the faint and complicated deficiency of the guided wave signals that sensor receives
Place, it is difficult to be applied in Practical Project.
It is electrochemistry with the monitoring corrosion of steel technology that the immediate prior art of the utility model is in concrete structure
Method corrosion monitoring, such as the cathode protection method of sacrificial anode, principle is measured by the small polarization near corrosion potential
Metal erosion speed is a kind of device that Monitoring Corrosion is realized by parameters such as the polarization resistances of measurement corrosion system.This
Class sensor there are the shortcomings that are as follows: anti-electromagnetism, temperature and humidity interference performance are poor, and measuring system is easily drifted about, be applied to electricity
Solve matter medium.For bridge cable, the corrosion monitoring sensor met the requirements and its method now there is no.
Utility model content
The technical problem to be solved by the present invention is to solve prior art problem, a kind of drag-line corrosion monitoring dress is provided
It sets.
Technical solution used by its technical problem of the solution of the utility model is:
There is provided a kind of drag-line corrosion monitor, including including corrosion monitoring sensor 1, sensor stand 2, readout instrument 3,
The corrosion monitoring sensor 1 is mounted at anchor head or drag-line by sensor stand 2, corrosion monitoring sensor 1 and readout instrument 3
Collected data are shown corrosion data by readout instrument 3, obtain corrosion rate by connection.
Preferably, the sensor stand 2 is annular support foot 21 or tubulose support cylinder 22.
The utility model also provides a kind of method of prestressed cable corrosion monitoring, and this method is corroded using the drag-line
The method that monitoring device is used for drag-line corrosion monitoring, comprises the concrete steps that: measuring electricity using ac voltage signal for sensor
Resistance need to only measure the resistance value of test specimen after corrosion, △ R is obtained compared with the standard electric resistance value of test specimen, to obtain test specimen corruption
Lose cross-sectional area △ A；
The basic principle of resistance-type measurement is as follows:
For conductive material as metal, the resistance of a certain section can be expressed with following formula:
R=ρ L/A (1)
Wherein: ρ represents the intrinsic resistivity of the material；
L represents the length of the section；
A represents the cross-sectional area of the section.
Electricalresistivityρ will be different with the difference of metal material and related to temperature.
For the alloy given under a room temperature, the resistance of the sample of certain length will increase with the reduction of cross-sectional area
Add.Therefore, the size for measuring resistance just can determine that the extent of deterioration of metal.Therefore, test block resistance value R, with test specimen standard electric
Increased resistance value △ R is compared to obtain in resistance, substitutes into above-mentioned formula (1), to show that test specimen corrodes cross-sectional area △ A.
The compensation that electricalresistivityρ varies with temperature will use a shielded reference elements from corrosion to complete.When
With temperature and when increasing, the resistance of reference elements also will increase the resistance of measuring cell.But due to the resistance ratio of two kinds of elements
It remains unchanged, realizes the resistance variations that automatic compensation is brought by temperature change.
Pulse measure induced electromotive force is used for sensor, need to only measure the inductance L of test specimen after corrosion, with
The standard inductance of test specimen relatively obtains △ L, to obtain magnetic circuit sectional area changing value △ S, the sectional area changing value △ S of magnetic circuit is
For the corrosion cross-sectional area △ A of test specimen.
The basic principle of inductance type measurement is as follows:
When the coil that the number of turns is N generates magnetic linkage ψ by electric current I.Magnetic linkage and coil current value are than referred to as inductance.
In formula: φ --- across the magnetic flux of every circle coil.
According to the Ohm's law of magnetic circuit:
In formula: Rm--- total magnetic resistance of magnetic circuit.
It can thus be concluded that:
It follows that when the timing of coil turn one, i.e., coil shape it is constant in the case where can pass through the magnetic resistance of magnetic circuit
Variation is to change electrodynamic capacity.
Wherein:
Magnetic resistance Rm is directly proportional to the length l of magnetic circuit, is inversely proportional with the sectional area S of magnetic circuit, and with the magnetic medium μ of magnetic circuit at anti-
Than.(5) substitution (2) formula is obtained into formula (6):
Therefore, it is calculated by formula (6), works as turn number N, coil inductance L, length of magnetic path l and the magnetic circuit section of sensor
After product S calibration, after test specimen corrosion, the inductance value variation △ L of coil is measured, obtains magnetic circuit sectional area changing value △ S to really
Determine the corrosion cross-sectional area △ A of test specimen.
Preferably, when being monitored to the long-term corrosion at steel for wire drawing, corrosion monitoring sensor 1 is mounted on anchor head
It is interior, it is connect after lead draws protective cover with external testing instrument, carries out data processing.
When being monitored to the long-term corrosion at drag-line cable body, corrosion monitoring sensor 1 is worn by sensor stand 2
It crosses anchorage and reaches cable body, connect after lead draws protective cover with external testing instrument, carry out data processing.
The principle of monitoring method: data collector controls ac voltage signal unit and generates ac voltage signal or pulse letter
Number unit generates pulse signal, the signal that analog-to-digital conversion signal processing unit measurement is fed back, by amplification, filtering and calculating
The resistance value R and calibrated corrosion thinning amount △ A (self-induction type) or inductance L that obtain measurement after processing and calibrated corruption
Erosion Reducing thickness △ S (mutual inductance type) is shown on readout instrument 3 or the external microprocessor for being equipped with monitoring of software, microprocessor
The measured value that the duration may be implemented shows and stores.
The utility model has the following beneficial effects:
1, it in sensor merging guy system, in environment identical at drag-line, is not influenced by external force or environmental change,
Corrosion condition inside reflection guy system for bridge in real time, size sensor is flexible, can be adapted to all kinds of stayed structures.It only needs to pass
Sensor is fixed in anchor head, or stretches to drag-line, is connected to external monitoring system by lead and is carried out data analysis.
2, sensor does not require media environment, does not need metal and electrolyte generates electrochemical reaction, be suitable for appointing
What medium.
3, in the case where drag-line normal use loads, it is convenient for changing corrosion sensor, drag-line itself is not destroyed, realized
Non-destructive testing.
Detailed description of the invention
Fig. 1: the utility model drag-line corrosion monitor structural schematic diagram；
Fig. 2: the rope erosion of the utility model monitors sensor scheme of installation
Fig. 3: the sensor stand of the utility model is a kind of drag-line corrosion monitoring sensor installation signal of annular support foot
Figure；
Fig. 4: the sensor stand of the utility model is a kind of drag-line corrosion monitoring sensor installation signal of tubulose support cylinder
Figure；
Fig. 5: the drag-line corrosion monitoring process block diagram of the utility model；
In figure: 1- corrosion monitoring sensor, 2- sensor stand, 21- annular support foot, 22- tubulose support cylinder, 3- readout instrument.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
Embodiment one
In the preferred embodiment of the utility model, drag-line corrosion monitor, as Figure 1-Figure 4, including including corruption
Erosion monitoring sensor 1, sensor stand 2, readout instrument 3, the corrosion monitoring sensor 1 are mounted on anchor by sensor stand 2
At head or drag-line, corrosion monitoring sensor 1 is connect with readout instrument 4, and collected data are passed through the display corrosion number of readout instrument 4
According to obtaining corrosion rate.
The monitoring sensor 1 is mounted on anchor head
As Figure 3-Figure 4, sensor stand 2 is annular support foot 21 or tubulose support cylinder 22, is loaded in drag-line normal use
In the case where, it is convenient for changing corrosion sensor, drag-line itself is not destroyed, realizes non-destructive testing.
Embodiment two
A kind of working method of drag-line corrosion monitor, comprises the concrete steps that: corrosion monitoring sensor (1) uses friendship
Galvanic electricity presses signal measurement resistance, measures the resistance value of test specimen after corrosion, △ R is obtained compared with the standard electric resistance value of test specimen, is obtained
Corrode cross-sectional area △ A to test specimen；
The basic principle of resistance-type measurement is as follows:
The resistance of test specimen can be expressed with following formula:
R=ρ L/A (1)
Wherein: ρ represents the intrinsic resistivity of test specimen；
L represents the length of test specimen；
A represents the cross-sectional area of test specimen.
Electricalresistivityρ will be different with the difference of metal material and related to temperature.
For the alloy under room temperature, the resistance of the sample of certain length will increase with the reduction of cross-sectional area, therefore, survey
The size of amount resistance just can determine that the extent of deterioration of test specimen.Therefore, test block resistance value R, compared with test specimen measuring resistance △
R substitutes into above-mentioned formula 1, to show that test specimen corrodes cross-sectional area △ A.
The compensation that electricalresistivityρ varies with temperature will use a shielded reference elements from corrosion to complete.When
With temperature and when increasing, the resistance of reference elements also will increase the resistance of measuring cell.But due to the resistance ratio of two kinds of elements
It remains unchanged, realizes the resistance variations that automatic compensation is brought by temperature change.
Pulse measure induced electromotive force is used for sensor, need to only measure the inductance L of test specimen after corrosion, with
The standard inductance of test specimen relatively obtains △ L, to obtain magnetic circuit sectional area changing value △ S, the sectional area changing value △ S of magnetic circuit is
For the corrosion cross-sectional area △ A of test specimen.
When being monitored to the long-term corrosion at steel for wire drawing, corrosion monitoring sensor 1 is pacified using annular support foot 21
In anchor head, it is connect after lead draws protective cover with external testing instrument, carries out data processing.
When being monitored to the long-term corrosion at drag-line cable body, corrosion monitoring sensor 1 is worn using tubulose support cylinder 22
It crosses anchorage and arrives to cable body, connect after lead draws protective cover with external testing instrument, carry out data processing.
Corrosion monitoring sensor 1 uses pulse measure induced electromotive force, test specimen inductance L after corrosion is measured, with examination
The standard inductance of part relatively obtains △ L, obtains magnetic circuit sectional area changing value △ S, the sectional area changing value △ S of magnetic circuit is test specimen
Corrosion cross-sectional area △ A.
The basic principle of inductance type measurement is as follows:
When the coil that the number of turns is N generates magnetic linkage ψ by electric current I.Magnetic linkage and coil current value are than referred to as inductance.
In formula: φ --- across the magnetic flux of every circle coil.
According to the Ohm's law of magnetic circuit:
In formula: Rm--- total magnetic resistance of magnetic circuit.
It can thus be concluded that:
It follows that when the timing of coil turn one, i.e., coil shape it is constant in the case where can pass through the magnetic resistance of magnetic circuit
Variation is to change electrodynamic capacity.
Wherein:
Magnetic resistance Rm is directly proportional to the length l of magnetic circuit, is inversely proportional with the sectional area S of magnetic circuit, and with the magnetic medium μ of magnetic circuit at anti-
Than.(5) substitution (2) formula is obtained into formula (6):
Therefore, it is calculated by formula (6), works as turn number N, coil inductance L, length of magnetic path l and the magnetic circuit section of sensor
After product S calibration, after test specimen corrosion, the inductance value variation △ L of coil is measured, obtains magnetic circuit sectional area changing value △ S to really
Determine the corrosion cross-sectional area △ A of test specimen.
The principle of monitoring method: data collector controls ac voltage signal unit and generates ac voltage signal or pulse letter
Number unit generates pulse signal, the signal that analog-to-digital conversion signal processing unit measurement is fed back, by amplification, filtering and calculating
The resistance value R and calibrated corrosion thinning amount △ A (self-induction type) or inductance L that obtain measurement after processing and calibrated corruption
Erosion Reducing thickness △ S (mutual inductance type) is shown on readout instrument or the external microprocessor for being equipped with monitoring of software, and microprocessor can also
To realize that the measured value of duration shows and stores.
Claims (2)
1. a kind of drag-line corrosion monitor, which is characterized in that the drag-line corrosion monitor includes corrosion monitoring sensor
(1), sensor stand (2), readout instrument (3), corrosion monitoring sensor (1) are connect with readout instrument (3), the corrosion monitoring sensing
Device (1) is mounted at anchor head or drag-line by sensor stand (2).
2. drag-line corrosion monitor according to claim 1, which is characterized in that the sensor stand (2) is ring
Shape support foot (21) or tubulose support cylinder (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616484.2U CN209673703U (en) | 2018-09-30 | 2018-09-30 | Drag-line corrosion monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821616484.2U CN209673703U (en) | 2018-09-30 | 2018-09-30 | Drag-line corrosion monitor |
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| Publication Number | Publication Date |
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| CN209673703U true CN209673703U (en) | 2019-11-22 |
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| CN201821616484.2U Active CN209673703U (en) | 2018-09-30 | 2018-09-30 | Drag-line corrosion monitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164143A (en) * | 2018-09-30 | 2019-01-08 | 柳州欧维姆结构检测技术有限公司 | Drag-line corrosion monitor and its method for prestressed cable corrosion monitoring |
-
2018
- 2018-09-30 CN CN201821616484.2U patent/CN209673703U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164143A (en) * | 2018-09-30 | 2019-01-08 | 柳州欧维姆结构检测技术有限公司 | Drag-line corrosion monitor and its method for prestressed cable corrosion monitoring |
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