CN103527897A - Anticorrosion method for PCCP - Google Patents
Anticorrosion method for PCCP Download PDFInfo
- Publication number
- CN103527897A CN103527897A CN201210405180.2A CN201210405180A CN103527897A CN 103527897 A CN103527897 A CN 103527897A CN 201210405180 A CN201210405180 A CN 201210405180A CN 103527897 A CN103527897 A CN 103527897A
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- China
- Prior art keywords
- pccp
- protection
- corrosion
- anticorrosion
- pipeline
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides an anticorrosion method for a PCCP. The method overcomes the defect that anticorrosion treatment is not carried out on the PCCP in traditional construction. The proposed solution scheme is that according to different environments, besides the anticorrosion design of the PCCP, the anticorrosion capacity of the PCCP can be improved in a pipeline surface coating protection method, a cathodic protection method and an external soil improvement method. According to the anticorrosion method for the PCCP, the anticorrosion capacity of the PCCP is improved; in addition, the service life of the PCCP is prolonged by taking different measures according to local conditions.
Description
Technical field
The present invention relates to construction field, the anti-corrosion method of especially buried cylinder concrete pipe (PCCP).
Background technique
Corrosion is the key factor that affects structure durability, is also the major reason that causes material breakage.With regard to prestress steel letter concrete pipe (hereinafter to be referred as PCCP), the corrosion of PCCP pipeline can be thought because forming material steel, concrete and the slush etc. of PCCP] cause the change of material property with surrounding environment generation physics one chemical action, cause material, environment or the system function that formed by it deteriorated with destruction.
PCCP is a kind of concrete steel composite pipe that prestressed concrete is base material of take, and therefore, under surrounding enviroment effect, the influence factor that makes buried tubing that corrosion occur wants complicated.The wherein tube core concrete of existing composition PCCP and the chemical corrosion that protective layer slush occurs under aggressive medium effect, the electrochemical corrosion also being occurred under aggressive media action by the steel that form PCCP.Because its design itself in PCCP produces is with certain antiseptic power, in traditional construction, will not do preservative treatment by PCCP, cause, under some specific environment, having affected the life-span of PCCP, caused loss.
Summary of the invention
The present invention just will not do antiseptic defect by PCCP in construction traditional in foregoing; the scheme of dealing with problems proposing is: according to varying environment; except the corrosion protection design of PCCP itself; also to use pipeline to carry out the method for the outside soil of cover coat protection, cathodic protection, change, increase the antiseptic power of PCCP.
The invention has the beneficial effects as follows: not only increased the antiseptic power of PCCP, and taked different measures, suited measures to local conditions, increased the life-span of PCCP.
Embodiment
The cover coat protection of 1.PCCP protective layer.
The feature of the method is to adopt some protection materials to be coated on PCCP external protection, and the oxygen in air, moisture or the soil of prevention tube circumference, water, salt medium permeate and diffusion in protective layer slush.Due to it have strong adaptability, economy, effectively, the feature such as convenient of constructing, be the measure of PCCP pipeline corrosion protection comparatively widely of using at present.
By the mechanism of action, divide, protective layer coating mainly contains enclosed type and the large class of isolated form two.
It is that very low silane or the water-borne coating of viscosity is coated with to the outer surface that is contained in the PCCP cement mortar protective course that reaches design strength that the holding of enclosed type cover coat levied; by pore surface tension effects, suck in the top layer of slush; it infiltrates thickness and is generally several millimeters; thereby obviously reduce moisture absorption and the muriatic infiltration capacity of surrounding environment of cement mortar protective course, reach the object of protection.
The feature of isolated form cover coat is at the certain thickness organic coating of protective layer application, with the Korrosionsmedium in isolating pipelines surrounding environment, water, oxygen to the erosion on cement mortar protective course surface and infiltration.As mainly containing of the coating of slush cover coat: epoxy coating, chlorinated rubber coating, acrylic coating, polyurethane coating etc.Epoxy resin coal-tar pitch coating wherein, because it has the advantages such as good adhesion, alkali resistance, acid resistance, price is low, easy to operate, is the first-selection in various coating.The effective thickness of isolated form cover coat is generally 400 ~ 800 μ m, if overweight coating can cause the defects such as peeling, trickling, has weakened on the contrary antiseptic effect.
2. cathode protection method.
Cathodic protection is a kind of by making metal surface as the negative electrode of electrochemical cell, thus the technology that its corrosion is alleviated.Its basic principle is by external dc power equipment, or the consumption of the metal more active than iron is continuously applied the cathode current of certain density to reinforcing bar, by its cathode polarization to a certain extent, thus make the oxidation utmost point reaction of reinforcing bar itself be prevented from or be reduced to very little degree.
Impressed current method in cathodic protection is to protected metal, to pass to cathode current by DC electrical source, and this protective system is mainly comprised of DC electrical source, auxiliary anode, reference electrode and cable etc.And sacrificial anode rule in cathodic protection is to connect the more negative metal or alloy of a kind of electrode potential as sacrificial anode on protected metal; by the oneself of sacrificial anode, dissolve and consume; make protected metal obtain cathode current, reach the object not being corroded.When being the method for buried PCCP pipeline selection cathodic protection, for avoiding the hydrogen embrittlement of PCCP reinforcement wire to destroy, select sacrificial anode protection.
3. change the outside edatope of pipeline.
Owing to causing the corrosion factor of buried PCCP corrosive pipeline, be all from pipeline soil or groundwater environment, can select the measures such as soil removal and replacement, thoroughly change the outside soil conditions of buried pipeline, thereby reach the object that protection pipeline is not etched and corrodes.
By weight ratio, be common soil or sand: the lime rendzinas backfill that approximately 3～4:1 ratio is mixed is positioned at the pipeline of this area.Area and high-sulfate washed off soil near that this method is applicable to polluted by strong acid or chemical plant are a kind of highly effective preservative treatment measures.Owing to having changed environment, eliminate or greatly reduced corrosion factor and corrode the probability of pipeline cement mortar protective course, and then reached corrosion-resistant object.But because this method working procedure is more complicated and cost is higher, be not suitable for, with dry whole pipe engineering, being only suitable in Local treatment, or be particularly suitable for existing in harsher corrosive environment, whole pipeline is minimum, and other most of pipelines all need not be made the engineering of additional anti-corrosion measure.
Claims (4)
1. the anti-corrosion method of buried cylinder concrete pipe (PCCP); it is characterized in that: according to varying environment; except the corrosion protection design of PCCP itself, also to use pipeline to carry out the method for the outside soil of cover coat protection, cathodic protection, change, increase the antiseptic power of PCCP.
2. the anti-corrosion method of buried cylinder concrete pipe according to claim 1 (PCCP), it is characterized in that: the effective thickness of isolated form cover coat is generally 400 ~ 800 μ m, if overweight coating can cause the defects such as peeling, trickling, weakened on the contrary antiseptic effect.
3. the anti-corrosion method of buried cylinder concrete pipe according to claim 1 (PCCP), is characterized in that: when selecting the method for cathodic protection for buried PCCP pipeline, for avoiding the hydrogen embrittlement of PCCP reinforcement wire to destroy, select sacrificial anode protection.
4. the anti-corrosion method of buried cylinder concrete pipe according to claim 1 (PCCP), is characterized in that: by weight ratio, be common soil or sand: the lime rendzinas backfill that approximately 3～4:1 ratio is mixed is positioned at the pipeline of this area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210405180.2A CN103527897A (en) | 2012-10-23 | 2012-10-23 | Anticorrosion method for PCCP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210405180.2A CN103527897A (en) | 2012-10-23 | 2012-10-23 | Anticorrosion method for PCCP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103527897A true CN103527897A (en) | 2014-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210405180.2A Pending CN103527897A (en) | 2012-10-23 | 2012-10-23 | Anticorrosion method for PCCP |
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| CN (1) | CN103527897A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982752A (en) * | 2014-05-14 | 2014-08-13 | 中工武大设计研究有限公司 | Dual side interaction cathode protection method for PCCP (prestressed concrete cylinder pipe) |
| CN104197129A (en) * | 2014-07-25 | 2014-12-10 | 深圳市清源管道科技发展有限公司 | A novel reinforced concrete drainage pipe and a manufacturing method thereof |
| CN112705446A (en) * | 2020-12-20 | 2021-04-27 | 李占群 | Urban sewer pipeline anticorrosion process method |
-
2012
- 2012-10-23 CN CN201210405180.2A patent/CN103527897A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982752A (en) * | 2014-05-14 | 2014-08-13 | 中工武大设计研究有限公司 | Dual side interaction cathode protection method for PCCP (prestressed concrete cylinder pipe) |
| CN104197129A (en) * | 2014-07-25 | 2014-12-10 | 深圳市清源管道科技发展有限公司 | A novel reinforced concrete drainage pipe and a manufacturing method thereof |
| CN104197129B (en) * | 2014-07-25 | 2017-08-22 | 深圳市清源管道科技发展有限公司 | A kind of novel reinforced concrete drainage pipe and its manufacture method |
| CN112705446A (en) * | 2020-12-20 | 2021-04-27 | 李占群 | Urban sewer pipeline anticorrosion process method |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |