CN102146566A - Cathode protection measurement constituent element for prestressed concrete cylinder pipeline - Google Patents
Cathode protection measurement constituent element for prestressed concrete cylinder pipeline Download PDFInfo
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- CN102146566A CN102146566A CN 201110053197 CN201110053197A CN102146566A CN 102146566 A CN102146566 A CN 102146566A CN 201110053197 CN201110053197 CN 201110053197 CN 201110053197 A CN201110053197 A CN 201110053197A CN 102146566 A CN102146566 A CN 102146566A
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Abstract
The invention relates to the field for cathode protection, in particular to a cathode protection measurement constituent element for a prestressed concrete cylinder pipeline. The cathode protection measurement constituent element is formed by three parts positioned in a concrete structural body, wherein the first constituent part is a steel wire test piece in a cathode protection state, namely a measurement constituent element protected body; the second constituent part is a steel wire test piece in a natural corrosion state, namely a natural corrosion body; and the third constituent part is a long-lasting copper sulfate reference electrode. In the cathode protection measurement constituent element, the conference electrode and the test pieces are in the concrete environment together; the used reference electrode is different from a classical copper sulfate reference electrode; and the problem of natural corrosion potential measurement of a prestressed steel wire in the situation that not anodes can be disconnected synchronously or serious stray current interference exists is solved; and the problem of cathode protection potential measurement of the prestressed steel wire after applying cathode protection is solved. On the basis, the problems of judging and evaluating whether the prestressed steel wire reaches specified indexes in standards are solved.
Description
Technical field
The present invention relates to the galvanic protection field, constituent element is measured in the galvanic protection that is specially a kind of Prestressed concrete cylinder pipe road (PCCP pipeline).
Background technology
When the PCCP pipeline is implemented galvanic protection,, there are galvanic protection of impressed current formula and sacrificial anode formula galvanic protection dual mode available by the mode difference that the cathodic polarization electric current is provided.Usually, select sacrificial anode formula galvanic protection mode.
Sacrificial anode formula galvanic protection mode when implementing, the construction materials contract of filling out that at first will select suitable sacrificial anode (as sacrificial zinc alloy anode) and can guarantee sacrificial anode electrochemical performance.Sacrificial anode packed into fill out in the construction materials contract bag, be embedded in from 2～3 meters places far away of PCCP pipeline; According to the size of PCCP caliber, on the cross section of pipe, to bury several sacrificial anodes sometimes, this highly branched sacrificial anode is usually placed in " 4 o'clock " of cross-section of pipeline, the position at " 8 o'clock " or " 6 o'clock ".
Secondly, sacrificial anode and PCCP pipeline are linked up reliably by cable.That is, an end of cable is welded on the steel core of sacrificial anode, and the other end of cable is welded on the compressor wire and steel cylinder of PCCP pipeline; Weld all will weld, and carries out anti-corrosion insulation.
At last,, guide on the wiring board in the detective pole, use for measuring by welding out the cable that measurement protection parameter is used on the PCCP pipeline.Conventional measuring method: portable copper sulfate reference electrode is placed on directly over the PCCP pipeline; and fully water; make itself and the earth be in good the contact; use the black pen (negative terminal) of digital multimeter to link to each other then with reference electrode; red test pencil (anode) link to each other with the measurement cable that PCCP in the detective pole draws (terminal is arranged on wiring board); open volt ohm-milliammeter, place the 2V shelves of direct voltage, just can record the cathodic protection potential of PCCP.
The disadvantage of the measuring method of this routine is: for the PCCP pipeline of sacrificial anode formula galvanic protection, it can not measure galvanic protection polarization value Δ E.
The effect of evaluation galvanic protection how, the judgment criterion (China is also formulating same class standard, and judgment criterion is consistent) that provide according to the NACE RP0100-2004 standard of the U.S..In judgment criterion, provided the binomial index:
The one, the cathodic protection potential of PCCP pipeline can not than-1000mV is more negative.Cross and negative may cause the compressor wire hydrogen embrittlement, will produce the security incident of booster.This index, the measuring method by routine can record.
The 2nd, the cathodic polarization value of PCCP pipeline should be able to reach 100mV (or being slightly less than 100mV), and under such cathodic polarization value effect, the PCCP pipeline has reached galvanic protection.This index by the routine measurement method, under the situation of sacrificial anode formula galvanic protection, is surveyed to be come out.Therefore, with conventional measuring method, can't estimate the cathode protection condition of PCCP pipeline.
This be because, cathodic polarization value Δ E=E
Cp-E
Corr, E wherein
CpBe the cathodic protection potential (or pipe/ground potential) of PCCP pipeline, E
CorrWhen not applying galvanic protection, PCCP Corrosion of Pipeline current potential (or spontaneous potential).After sacrificial anode is burn-on, just no longer disconnected, therefore also just can not survey E
CorrSo, can't determine Δ E, can't determine the cathode protection condition of PCCP.
Summary of the invention
The object of the present invention is to provide the galvanic protection in a kind of Prestressed concrete cylinder pipe road to measure constituent element, solve in the prior art and can't determine the galvanic protection polarization value, can not estimate problem such as cathode protection condition exactly.
Technical scheme of the present invention is:
Constituent element is measured in the galvanic protection in a kind of Prestressed concrete cylinder pipe road, and it is that three parts that are arranged in concrete body constitute that constituent element is measured in described galvanic protection:
First integral part is the steel wire test specimen that is under the cathode protecting state: measure the protected body of constituent element; Second is formed the position is steel wire test specimen under being in natural corrosion state: the spontaneous corrosion body; The 3rd integral part is long-acting copper sulfate reference electrode.
One end of the protected body steel wire of the described measurement constituent element test specimen cable of burn-oning; the other end of cable is guided on the interior wiring board of detective pole; and, make the compressor wire of measuring protected body of constituent element and Prestressed concrete cylinder pipe road be in electric conducting state with it and by cross-over connection on the wiring board of the cable of drawing on the Prestressed concrete cylinder pipe road in detective pole.
Constituent element is measured in the galvanic protection in described Prestressed concrete cylinder pipe road, measures the protected body of constituent element and receives the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the counter electrode end of potentiostat.
One end of the described spontaneous corrosion body steel wire test specimen cable of burn-oning, the other end of cable are guided on the wiring board in the detective pole, make this steel wire test specimen be in natural corrosion state.
Constituent element is measured in the galvanic protection in described Prestressed concrete cylinder pipe road, and the spontaneous corrosion body is received the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the working electrode end of potentiostat.
Constituent element is measured in the galvanic protection in described Prestressed concrete cylinder pipe road, and an end of the long-acting copper sulfate reference electrode cable of burn-oning, the other end of cable are guided on the wiring board in the detective pole.
Constituent element is measured in the galvanic protection in described Prestressed concrete cylinder pipe road, and long-acting copper sulfate reference electrode is received the black tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the reference electrode end of potentiostat.
Compared with prior art, advantage of the present invention and beneficial effect are as follows:
1, the present invention structurally is three electrodes: the steel wire test specimen in the raw is in steel wire test specimen and reference electrode under the guard mode.Reference electrode all is co-located in the concrete environment with the steel wire test specimen, and used reference electrode is not both classical copper sulfate reference electrode.The present invention solves sacrificial anode and can not all disconnect synchronously or have under the serious stray current interferential situation, the spontaneous potential problems of measurement of compressor wire; After applying galvanic protection, the cathodic protection potential problems of measurement of compressor wire.On this basis, solve compressor wire and whether reached the judgement of set quota in the standard, evaluation problem.
2, the present invention has emphasized to have with PCCP cathodic protection engineering practice the function of the protective current density measurement of substantial connection, and determining of falling of cathodic polarization value Δ E and IR.
3, the present invention is when the measurement constituent element with three-electrode structure carries out polarization curve and corrosion speed measurement; fully can be with being in steel wire test specimen under the guard mode originally as supporting electrode " C " of potentiostat (receive end); be in steel wire test specimen under the natural corrosion state as research electrode " W " of potentiostat (receive end), reference electrode is still done the reference electrode (receiving " R " end of potentiostat) in the above-mentioned measurement.Above-mentioned polarization curve is generally the measurement of weak polarized area or linear section, and is little to measured system disturbance, and measuring period is short.
4, the prerequisite performance of reference electrode is: current potential is stable when life-time service, favorable reproducibility, and exchange current density big (being difficult for polarization), long service life has certain mechanical strength.Reference electrode must be a reversible electrode, and reversible electrode must be to be in equilibrium state.What use among the present invention is long-acting copper sulfate reference electrode, belong to use the most generally, one of four kinds of reference electrodes with the longest history of usefulness (silver chloride electrode, zinc and zinc alloy electrode, copper sulfate electrode, mercurous chloride electrode).Theoretical investigation and secular generally use practice all prove: the copper sulfate reference electrode possesses above-mentioned whole indispensable performance.
5, the present invention probe (constituent element) not regulation or the fixed size, concrete layer can wrap three electrode package, thickness, spacing is moderate gets final product.
6, the present invention is simple in structure; the reliability height; work-ing life (cycle) is long; can reach 20 years; steel wire test specimen and whole measurement constituent element processing and fabricating are easier to; can satisfy the measurement requirement of the criteria for cathodic protection of NACE RP 0100-2004 USS regulation, can be used for the galvanic protection effect assessment of PCCP pipeline.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure, 1 measures the protected body of constituent element (φ 7mm); 2 long-acting (copper sulfate) reference electrode; 3 spontaneous corrosion bodies (φ 7mm); 4 concrete bodies.
Embodiment
As shown in Figure 1, the galvanic protection in Prestressed concrete cylinder pipe of the present invention road is measured constituent element and is made up of three parts that are arranged in concrete body 4:
First integral part is the steel wire test specimen that is under the cathode protecting state: measure the protected body 1 of constituent element, be used for simulating the guard mode of the ducted compressor wire of PCCP.Specific practice is: burn-on cable and carry out anti-corrosion insulation of an end of this steel wire test specimen; the other end of cable is guided on the interior wiring board of detective pole; and with it and by cross-over connection on the wiring board of the cable of drawing on the PCCP pipeline in detective pole; make the compressor wire of measuring protected body 1 of constituent element and PCCP pipeline be in electric conducting state, all be in cathode protecting state.So, receive the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or " C " end of potentiostat (" C " end is the counter electrode end) by measuring the protected body 1 of constituent element, the cathodic protection potential that records has just been represented the cathodic protection potential E of the compressor wire of PCCP pipeline
Cp
Second is formed the position is steel wire test specimen under being in natural corrosion state: spontaneous corrosion body 3; also weld out an outgoing cable; the other end of cable is also guided on the interior wiring board of detective pole; but not with by the cable cross-over connection of drawing on the pipeline; make this steel wire test specimen be in natural corrosion state; when simulation PCCP pipeline does not apply galvanic protection, the natural corrosion state of compressor wire.So, receive the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or " W " end of potentiostat (" W " end is the working electrode end) by this spontaneous corrosion body 3, the corrosion potential that records has just been represented the corrosion potential E when prestress does not apply galvanic protection in the PCCP pipeline
Corr
The 3rd integral part is long-acting (copper sulfate) reference electrode 2; long-acting (copper sulfate) reference electrode 2 welds out an outgoing cable; guide on the wiring board in the detective pole; as reference electrode relatively; long-acting (copper sulfate) reference electrode 2 is received the black tip of the brushstyle of a writing or painting of volt ohm-milliammeter or " R " end of potentiostat (" R " end is the reference electrode end), is measuring cathodic protection potential E
CpWith corrosion potential E
CorrIn time, used.The advantage that presets long-acting copper sulfate reference electrode in measuring constituent element is that the IR that can reduce significantly in the measurement falls, and improves the accuracy of measuring.This reference electrode that presets has been arranged, just can portable reference electrode during measurement, more convenient during field measurement.After long effective reference electrode lost efficacy, yet available portable reference electrode did not have influence on the function of measuring constituent element in ground survey.
Can record by measurement constituent element of the present invention:
(1) the cathodic protection potential E of PCCP pipeline
Cp(judging whether that ratio-1000mV is more negative);
(2) PCCP Corrosion of Pipeline current potential E
Corr(estimating its corrosion tendency or degree);
(3) determine cathodic polarization value Δ E=E
Cp-E
Corr(judging whether the PCCP pipeline reaches the protection criterion);
(4) be in the switch-off potential E of the steel wire test specimen of guard mode
Off
(5) determine that IR falls, IR=E
Cp-E
Off
(6) be in the protective current I of the steel wire test specimen under the guard mode
Cp
(7) determine the protective current density i of steel wire test specimen under the guard mode
Cp=I
Cp(S is the area of steel wire test specimen to/S.This parameter can be judges that the protective current density of measuring near the compressor wire in the constituent element place of burying underground provides foundation; Be under the similar corrosion working conditions, the cathodic Protection Design parameter selects to provide reference).
The measuring method that the present invention measures constituent element is as follows:
Cathodic protection potential E
Cp, corrosion potential E
CorrMeasuring method and definite method of cathodic polarization value Δ E, as previously mentioned.
Switch-off potential E
OffMeasurement: when the steel wire test specimen terminal that is in guard mode and PCCP outlet line terminal are in two terminal cross-over connections; the black tip of the brushstyle of a writing or painting of volt ohm-milliammeter of band crocodile clip is clipped on the terminal of long effective reference electrode; the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter of band crocodile clip is clipped on the steel wire test specimen terminal under the guard mode; volt ohm-milliammeter places the 2V shelves of direct voltage, record cathodic protection potential E
CpThen, disconnect the cross-over connection of two terminals, (almost) that disconnect cross-over connection simultaneously, read the numerical value that (record) volt ohm-milliammeter shows at once, this numerical value is switch-off potential E
OffCommitted step in this parameter measurement process is: (almost) that disconnect cross-over connection simultaneously, at once, at once, (almost) synchronously read the numerical value of (record) volt ohm-milliammeter demonstration.
Measure and finish, recovered cross-over connection.
IR falls definitely: E
Cp-E
Off=IR.Because in measuring constituent element, the distance between the steel wire test specimen of long effective reference electrode is very little, promptly R is very little; And the cathodic protection current I of steel wire test specimen is also very little, usually at microampere order.So IR can be very little.
The protective current I of steel wire test specimen
CpMeasurement: will be on the connection terminal of the steel wire test specimen that is in guard mode with the black pen clip jail of the volt ohm-milliammeter of crocodile clip, red pen clip jail is on the terminal of pipeline outlet line.Volt ohm-milliammeter is transferred to the galvanic current shelves, be positioned at the 2mA shelves, open volt ohm-milliammeter, be in the measurement state.Then, disconnect cross-over connection, read (record) current value I
CpIf it is excessive that range is worked as in measurement, but the littler next stage range of tuning, until energy read current value.The key operation step is to insert earlier volt ohm-milliammeter, and the back disconnects, can not be anti-.
After measuring end, recover cross-over connection.
Determining of protective current density: i
Cp=I
Cp/ S=I
CpIn/π dl the formula, d is a steel wire diameter, cm; L is the length that is exposed to the steel wire test specimen in the concrete, cm; i
CpBe protective current density, mA/cm
2Or μ A/cm
2
The field measurement data that constituent element is measured in PCCP galvanic protection of the present invention are as follows:
Table 1
| Measuring Time (year. month. day) | 2010.7.20 | 2010.9.2 | 2010.10.10 | 2010.11.11 |
| Protection potential E cp，(-mV) | 498 | 854 | 875 | 691 |
| Corrosion potential E corr，(-mV) | 408 | 598 | 603 | 421 |
| Polarization value-Δ E, (mV) | 90 | 256 | 272 | 270 |
| Switch-off potential E off，(-mV) | 673 | |||
| (mV) falls in IR | 18 | |||
| Protective current I cp (mA) | 60 | |||
| Protective current density, (mA/cm 2) | 1.78 | |||
| Test specimen area S, (cm 2) | 33.74 |
Claims (7)
1. constituent element is measured in the galvanic protection in a Prestressed concrete cylinder pipe road, it is characterized in that, it is that three parts that are arranged in concrete body constitute that constituent element is measured in described galvanic protection:
First integral part is the steel wire test specimen that is under the cathode protecting state: measure the protected body of constituent element; Second is formed the position is steel wire test specimen under being in natural corrosion state: the spontaneous corrosion body; The 3rd integral part is long-acting copper sulfate reference electrode.
2. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 1 road; it is characterized in that; one end of the protected body steel wire of the described measurement constituent element test specimen cable of burn-oning; the other end of cable is guided on the interior wiring board of detective pole; and, make the compressor wire of measuring protected body of constituent element and Prestressed concrete cylinder pipe road be in electric conducting state with it and by cross-over connection on the wiring board of the cable of drawing on the Prestressed concrete cylinder pipe road in detective pole.
3. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 2 road, it is characterized in that, measure the protected body of constituent element and receive the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the counter electrode end of potentiostat.
4. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 1 road; it is characterized in that; one end of the described spontaneous corrosion body steel wire test specimen cable of burn-oning, the other end of cable are guided on the wiring board in the detective pole, make this steel wire test specimen be in natural corrosion state.
5. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 4 road, it is characterized in that the spontaneous corrosion body is received the red tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the working electrode end of potentiostat.
6. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 1 road, it is characterized in that, an end of the long-acting copper sulfate reference electrode cable of burn-oning, the other end of cable are guided on the wiring board in the detective pole.
7. measure constituent element according to the galvanic protection in the described Prestressed concrete cylinder pipe of claim 6 road, it is characterized in that long-acting copper sulfate reference electrode is received the black tip of the brushstyle of a writing or painting of volt ohm-milliammeter or the reference electrode end of potentiostat.
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| CN 201110053197 CN102146566A (en) | 2011-03-07 | 2011-03-07 | Cathode protection measurement constituent element for prestressed concrete cylinder pipeline |
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| CN 201110053197 CN102146566A (en) | 2011-03-07 | 2011-03-07 | Cathode protection measurement constituent element for prestressed concrete cylinder pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535522A (en) * | 2012-02-14 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN104005032A (en) * | 2014-05-08 | 2014-08-27 | 青岛双瑞海洋环境工程股份有限公司 | Cathode protection test probe of prestressed steel cylinder concrete pipe and preparation method thereof |
| CN110487711A (en) * | 2018-05-14 | 2019-11-22 | 通用汽车环球科技运作有限责任公司 | Method and system for real-time watch device corrosion |
| CN110735141A (en) * | 2019-11-21 | 2020-01-31 | 无锡纽思铁科能源科技有限公司 | intelligent cathodic protection system based on LoRa spread spectrum communication |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201347454Y (en) * | 2008-11-18 | 2009-11-18 | 北京市水利规划设计研究院 | Cathodic protection test probe for concrete pipe |
| CN101857957A (en) * | 2010-04-12 | 2010-10-13 | 天津市水利科学研究院 | Cathodic protection monitoring probe, cathodic protection monitoring probe monitoring system, and manufacturing method and monitoring method thereof |
-
2011
- 2011-03-07 CN CN 201110053197 patent/CN102146566A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201347454Y (en) * | 2008-11-18 | 2009-11-18 | 北京市水利规划设计研究院 | Cathodic protection test probe for concrete pipe |
| CN101857957A (en) * | 2010-04-12 | 2010-10-13 | 天津市水利科学研究院 | Cathodic protection monitoring probe, cathodic protection monitoring probe monitoring system, and manufacturing method and monitoring method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535522A (en) * | 2012-02-14 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN102535522B (en) * | 2012-02-14 | 2016-03-30 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN104005032A (en) * | 2014-05-08 | 2014-08-27 | 青岛双瑞海洋环境工程股份有限公司 | Cathode protection test probe of prestressed steel cylinder concrete pipe and preparation method thereof |
| CN110487711A (en) * | 2018-05-14 | 2019-11-22 | 通用汽车环球科技运作有限责任公司 | Method and system for real-time watch device corrosion |
| CN110735141A (en) * | 2019-11-21 | 2020-01-31 | 无锡纽思铁科能源科技有限公司 | intelligent cathodic protection system based on LoRa spread spectrum communication |
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Application publication date: 20110810 |