CN109187324B - Nondestructive diagnosis method for corrosion of underground concrete structure steel - Google Patents
Nondestructive diagnosis method for corrosion of underground concrete structure steel Download PDFInfo
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Abstract
discloses a nondestructive diagnosis method for corrosion of underground concrete structure steel, belonging to the technical field of underground structure overhaul and maintenance. It includes: selecting at least 5 detection points of a soil layer around a standard sample; determining the mass percent Cl-, the pH, and the volume percent O2 of the at least 5 detection points; carrying out actual diagnosis on the at least 5 detection points to obtain a standard curve; performing mathematical fitting to respectively obtain a first functional relational expression, a second functional relational expression and a third functional relational expression among the corrosion percentage, the mass percentage of Cl-, the pH value and the volume percentage of O2; combining and fitting to obtain a fourth function relation that the independent variables comprise Cl < - > in percentage by mass, pH and O2 in percentage by volume, and the dependent variable is the rust percentage; measuring the mass percentage content, the pH value and the volume percentage content of O2 of Cl < - > at a detection point to be detected; and substituting the corrosion percentage into a fourth function relation to obtain the corrosion percentage of the detection point to be detected. The diagnosis process is simple, and the result is accurate.
Description
Technical Field
The invention relates to the technical field of underground structure overhaul and maintenance, in particular to a nondestructive diagnosis method for corrosion of underground concrete structure steel.
background
the underground foundation structure is a main bearing body of the upper structure, needs to bear dead weight load, wind load, other environmental loads and the like transmitted by the upper structure, and is in addition subjected to adverse factors such as changes of geological environment, natural environment and the like, and the safety performance of the underground foundation structure is directly related to the safety of the upper structure. The underground structure is a hidden project, the integrity of the underground structure cannot be detected in daily life like an above-ground structure, and accurate data cannot be obtained for the corrosion rate of the steel bars in the underground structure. Aiming at the hidden structure of the power transmission iron tower foundation, if various factors are comprehensively considered, the invention is a convenient nondestructive diagnosis method for the corrosion of the reinforcing steel bar of the underground structure, which is easy to be understood by engineering technicians, and is urgent.
Disclosure of Invention
In view of the above, the invention provides a nondestructive diagnosis method for underground concrete structure steel corrosion, which can be used for nondestructive diagnosis of underground concrete structure steel corrosion, and the diagnosis method has the advantages of simple diagnosis process and accurate result, thereby being more practical.
in order to achieve the aim, the technical scheme of the nondestructive diagnosis method for the corrosion of the steel of the underground concrete structure is as follows:
The invention provides a nondestructive diagnosis method for corrosion of underground concrete structure steel, which comprises the following steps:
Selecting at least 5 detection points of a soil layer around a standard underground concrete structure steel sample;
measuring the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at least at 5 detection points of soil layers around the standard underground concrete structure steel sample;
carrying out actual diagnosis on at least 5 detection points of the soil layer around the standard underground concrete structure steel sample, and obtaining a diagnosis conclusion of corrosion percentage corresponding to the at least 5 detection points of the soil layer around the standard underground concrete structure steel sample;
drawing 3 standard curves with the rust percentage as the ordinate and the abscissa as the mass percentage of Cl < - >, the pH value and the volume percentage of O2 respectively;
performing mathematical fitting on the 3 standard curves respectively to obtain a first functional relation between the corrosion percentage and the mass percentage content of Cl < - >, a second functional relation between the corrosion percentage and the pH value and a third functional relation between the corrosion percentage and the volume percentage content of O2;
Combining and fitting a first functional relation among the corrosion percentage and the mass percentage of Cl-, a second functional relation among the corrosion percentage and pH, and a third functional relation among the corrosion percentage and the volume percentage of O2 to obtain a fourth functional relation of independent variables including the mass percentage of Cl-, the pH and the volume percentage of O2, wherein the dependent variable is the corrosion percentage;
selecting a detection point to be detected of an underground concrete structure steel surrounding soil layer to be detected, and determining the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at the detection point to be detected;
And substituting the obtained mass percentage content of Cl < - > at the detection point to be detected, the pH value and the volume percentage content of O2 into the fourth function relation, and calculating to obtain the corrosion percentage at the detection point to be detected.
The nondestructive diagnosis method for the corrosion of the underground concrete structure steel can be further realized by adopting the following technical measures.
Preferably, the at least 5 detection points are selected from soil layers around the same standard underground concrete structure steel sample.
preferably, the at least 5 detection points are selected from different soil layers surrounding the standard underground concrete structure steel sample.
Preferably, the standard underground concrete structure steel sample is set in the soil for at least 1 month.
Preferably, the actual diagnosis of at least 5 detection points in the soil layer around the standard underground concrete structure steel sample is performed by taking out the standard underground concrete structure steel sample or excavating the soil layer around the standard underground concrete structure steel sample to expose the standard underground concrete structure steel sample.
Preferably, the depths of the at least 5 detection points are different.
Preferably, the method for determining the mass percentage content of Cl-, pH-and the volume percentage content of O2 at least at 5 detection points of the soil layer around the standard underground concrete structure steel sample comprises the following steps:
Excavating a hole in a soil layer around the standard underground concrete structure steel sample until the depth of the hole is matched with the depth of the at least 5 detection points;
Respectively placing a first detection instrument probe for determining the mass percentage content of Cl < - >, a second detection instrument probe for determining the pH and a third detection instrument probe for determining the volume percentage content of O2 in the hole;
the soil dug out when the hole is dug by backfilling enables the first detection instrument probe for measuring the mass percentage content of Cl < - >, the second detection instrument probe for measuring the pH value and the third detection instrument probe for measuring the volume percentage content of O2 to be stable;
After a delay time period, reading the first detection instrument for determining the mass percentage of the Cl-, the second detection instrument for determining the pH and the third detection instrument for determining the volume percentage of the O2 respectively to obtain the mass percentage of the Cl-, the pH and the volume percentage of the O2 of the soil layer around the standard underground concrete structure steel sample at least 5 detection points.
Preferably, the first detecting device for measuring the mass percentage of Cl-, the second detecting device for measuring pH, and the third detecting device for measuring the volume percentage of O2 are respectively provided with a pull rope.
preferably, the distance between the setting position of the standard underground concrete structure steel sample and the setting position of the underground concrete structure steel to be measured is not more than 100 m.
Preferably, the nondestructive diagnosis method for the corrosion of the underground concrete structure steel further comprises the following steps,
for the detection point to be detected, measuring the mass percentage content of Cl < - >, the pH value and the volume percentage content of O2 at intervals of set time for multiple times;
Respectively substituting the mass percentage content of Cl < - > obtained through multiple times of measurement, the pH value and the volume percentage content of O2 into the fourth function relational expression, and calculating to obtain the corrosion percentage at the detection point to be detected;
And drawing a curve with the ordinate as the corrosion percentage of the detection point to be detected and the abscissa as time, namely obtaining a relation curve of the corrosion percentage of the detection point to be detected changing along with time.
The invention detects the corrosion percentage of the detection point to be detected by tracing points in the standard curve after drawing the standard curve, and can obtain the mass percentage content of Cl < - > and the pH value of the detection point to be detected and the volume percentage content of O2 by using a detection instrument to obtain the corrosion percentage of the detection point to be detected as long as the standard curve is drawn.
drawings
various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
Fig. 1 is a flow chart illustrating steps of a nondestructive diagnosis method for corrosion of steel of an underground concrete structure according to an embodiment of the present invention.
Detailed Description
the invention aims to solve the problems in the prior art and provides a nondestructive diagnosis method for underground concrete structure steel corrosion, which can be used for nondestructive diagnosis of underground concrete structure steel corrosion, and the diagnosis process is simple and accurate in result, so that the method is more practical.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the method for nondestructive diagnosis of corrosion of steel in an underground concrete structure, its specific implementation, structure, characteristics and effects will be provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
the term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
referring to the attached drawing 1, the nondestructive diagnosis method for corrosion of underground concrete structure steel provided by the embodiment of the invention comprises the following steps:
Step S1: selecting at least 5 detection points of a soil layer around a standard underground concrete structure steel sample;
Step S2: measuring the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at least at 5 detection points of soil layers around the standard underground concrete structure steel sample;
step S3: carrying out actual diagnosis on at least 5 detection points of a soil layer around the standard underground concrete structure steel sample, and obtaining a diagnosis conclusion of corrosion percentage corresponding to the at least 5 detection points of the soil layer around the standard underground concrete structure steel sample;
Step S4: drawing 3 standard curves with the rust percentage as the ordinate and the abscissa as the mass percentage of Cl < - >, the pH value and the volume percentage of O2 respectively;
step S5: respectively carrying out mathematical fitting on the 3 standard curves to respectively obtain a first functional relation between the corrosion percentage and the mass percentage content of Cl-, a second functional relation between the corrosion percentage and the pH value and a third functional relation between the corrosion percentage and the volume percentage content of O2;
Step S6: combining and fitting a first functional relation among the corrosion percentage and the mass percentage of Cl-, a second functional relation among the corrosion percentage and the pH, and a third functional relation among the corrosion percentage and the volume percentage of O2 to obtain a fourth functional relation of independent variables including the mass percentage of Cl-, the pH and the volume percentage of O2, wherein the dependent variable is the corrosion percentage;
Step S7: selecting a detection point to be detected of an underground concrete structure steel surrounding soil layer to be detected, and determining the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at the detection point to be detected;
step S8: and substituting the obtained mass percentage content of Cl < - > at the detection point to be detected, the pH value and the volume percentage content of O2 into a fourth function relation, and calculating to obtain the corrosion percentage at the detection point to be detected.
the embodiment of the invention detects the corrosion percentage of the detection point to be detected by tracing points in the standard curve after drawing the standard curve, and can obtain the mass percentage content of Cl < - > and the pH value of the detection point to be detected and the volume percentage content of O2 by using a detection instrument to obtain the corrosion percentage of the detection point to be detected as long as the standard curve is drawn.
Wherein, at least 5 detection points are selected from soil layers around the same standard underground concrete structure steel sample. In this case, the calibration can be performed on the same standard underground concrete structure steel sample, and the calibration accuracy is high.
wherein at least 5 detection points are selected from soil layers around different standard underground concrete structure steel samples. In this case, the calibration can be performed on different standard underground concrete structure steel samples, the application range after the calibration by the calibration method is wider, in this embodiment, the distance between different standard underground concrete structure steel samples is not more than 100m, and in this case, errors caused by changes in soil texture and environment can be avoided.
Wherein a standard underground concrete structure steel sample is set in soil for at least 1 month. In this case, the standard underground concrete structure steel sample can have enough corrosion time, so that the corresponding corrosion percentage is reached, and the related data range of the calibrated corrosion percentage is wider.
the method for actually diagnosing at least 5 detection points of the soil layer around the standard underground concrete structure steel sample comprises the steps of taking out the standard underground concrete structure steel sample or excavating the soil layer around the standard underground concrete structure steel sample to expose the standard underground concrete structure steel sample. The method for taking out the standard underground concrete structure steel sample is suitable for the condition that the weight and the volume of the standard underground concrete structure steel sample are small, the soil layer around the standard underground concrete structure steel sample is excavated, the method for exposing the standard underground concrete structure steel sample is suitable for the condition that the weight and the volume of the standard underground concrete structure steel sample are large, and in practice, the method can be selected according to actual conditions.
wherein the depths of at least 5 detection points are different. In this case, the depth range of the detection point can be made wider.
the method for measuring the mass percentage content, the pH value and the volume percentage content of O2 of Cl < - > at least at 5 detection points of soil layers around a standard underground concrete structure steel sample comprises the following steps:
step S201: excavating holes in a soil layer around the standard underground concrete structure steel sample until the depth of the holes is adapted to the depth of at least 5 detection points;
step S202: respectively placing a first detection instrument probe for determining the mass percentage content of Cl < - >, a second detection instrument probe for determining the pH and a third detection instrument probe for determining the volume percentage content of O2 in the hole;
step S203: the excavated soil when the excavated hole is backfilled enables a first detection instrument probe for measuring the mass percentage content of Cl-, a second detection instrument probe for measuring pH and a third detection instrument probe for measuring the volume percentage content of O2 to be stable;
Step S204: after a delay time period, reading the first detection instrument for determining the mass percentage of the Cl-, the second detection instrument for determining the pH and the third detection instrument for determining the volume percentage of the O2 respectively to obtain the mass percentage of the Cl-, the pH and the volume percentage of the O2 of at least 5 detection points of the soil layer around the standard underground concrete structure steel sample.
In this case, the results of the mass percentage of Cl ", the pH, and the volume percentage of O2 obtained at least at 5 detection points can be made more accurate and stable.
And pull ropes are respectively arranged on the first detection instrument for determining the mass percentage content of Cl < - >, the second detection instrument for determining the pH and the third detection instrument for determining the volume percentage content of O2. In this case, the first detecting instrument for measuring the mass percentage of Cl ", the second detecting instrument for measuring pH, and the third detecting instrument for measuring the volume percentage of O2 can be easily taken out from the soil layer, and they can be taken out separately by pulling the pulling string.
and the distance between the setting position of the standard underground concrete structure steel sample and the setting position of the underground concrete structure steel to be detected is not more than 100 m. In this case, errors due to changes in soil quality and environment can be avoided.
Wherein, the nondestructive diagnosis method for the corrosion of the underground concrete structure steel further comprises the following steps,
step S9: for a detection point to be detected, determining the mass percentage content, the pH value and the volume percentage content of O2 of Cl-for a plurality of times at intervals of set time;
Step S10: respectively substituting the mass percentage content of Cl < - >, the pH value and the volume percentage content of O2 obtained by multiple times of measurement into a fourth function relation, and calculating to obtain the corrosion percentage at the detection point to be detected;
step S11: and drawing a curve with the ordinate as the corrosion percentage of the detection point to be detected and the abscissa as time, namely obtaining a relation curve of the corrosion percentage of the detection point to be detected changing along with the time.
under the condition, the change trend of the corrosion percentage of the underground concrete structure steel can be predicted through a relation curve of the corrosion percentage at the detection point to be detected changing along with time, once the inflection point of the curve fluctuates greatly, maintenance or replacement of the underground concrete structure steel is prompted, and related accidents can be avoided.
while preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The nondestructive diagnosis method for the corrosion of the steel of the underground concrete structure is characterized by comprising the following steps of:
selecting at least 5 detection points of a soil layer around a standard underground concrete structure steel sample;
Measuring the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at least at 5 detection points of soil layers around the standard underground concrete structure steel sample;
Carrying out actual diagnosis on at least 5 detection points of the soil layer around the standard underground concrete structure steel sample, and obtaining a diagnosis conclusion of corrosion percentage corresponding to the at least 5 detection points of the soil layer around the standard underground concrete structure steel sample;
Drawing 3 standard curves with the rust percentage as the ordinate and the abscissa as the mass percentage of Cl < - >, the pH value and the volume percentage of O2 respectively;
Performing mathematical fitting on the 3 standard curves respectively to obtain a first functional relation between the corrosion percentage and the mass percentage content of Cl < - >, a second functional relation between the corrosion percentage and the pH value and a third functional relation between the corrosion percentage and the volume percentage content of O2;
combining and fitting a first functional relation among the corrosion percentage and the mass percentage of Cl-, a second functional relation among the corrosion percentage and pH, and a third functional relation among the corrosion percentage and the volume percentage of O2 to obtain a fourth functional relation of independent variables including the mass percentage of Cl-, the pH and the volume percentage of O2, wherein the dependent variable is the corrosion percentage;
selecting a detection point to be detected of an underground concrete structure steel surrounding soil layer to be detected, and determining the mass percentage content of Cl < - > and the pH value and the volume percentage content of O2 at the detection point to be detected;
and substituting the obtained mass percentage content of Cl < - > at the detection point to be detected, the pH value and the volume percentage content of O2 into the fourth function relation, and calculating to obtain the corrosion percentage at the detection point to be detected.
2. the nondestructive diagnosis method for the corrosion of steel of underground concrete structure according to claim 1, characterized in that said at least 5 detection points are selected from the soil layer surrounding the same standard underground concrete structure steel sample.
3. The nondestructive diagnosis method for the corrosion of steel of underground concrete structure according to claim 1, characterized in that said at least 5 detection points are selected from different soil layers around the standard underground concrete structure steel sample.
4. The nondestructive diagnosis method for the corrosion of underground concrete structure steel according to claim 1, wherein said standard underground concrete structure steel sample is set in the soil for at least 1 month.
5. the nondestructive diagnosis method for the corrosion of underground concrete structure steel according to claim 1, wherein the actual diagnosis of at least 5 detection points in the soil layer surrounding the standard underground concrete structure steel sample is to take out the standard underground concrete structure steel sample or to excavate the soil layer surrounding the standard underground concrete structure steel sample to expose the standard underground concrete structure steel sample.
6. the nondestructive diagnosis method for steel corrosion of an underground concrete structure according to claim 1, characterized in that the depths of said at least 5 detection points are different.
7. the nondestructive diagnosis method for the corrosion of underground concrete structure steel according to claim 1, characterized in that the method for measuring the mass percentage content of Cl ", pH and the volume percentage content of O2 at least at 5 detection points of the soil layer around the standard underground concrete structure steel sample comprises the following steps:
excavating a hole in a soil layer around the standard underground concrete structure steel sample until the depth of the hole is matched with the depth of the at least 5 detection points;
Respectively placing a first detection instrument probe for determining the mass percentage content of Cl < - >, a second detection instrument probe for determining the pH and a third detection instrument probe for determining the volume percentage content of O2 in the hole;
The soil dug out when the hole is dug by backfilling enables the first detection instrument probe for measuring the mass percentage content of Cl < - >, the second detection instrument probe for measuring the pH value and the third detection instrument probe for measuring the volume percentage content of O2 to be stable;
after a delay time period, reading the first detection instrument for determining the mass percentage of the Cl-, the second detection instrument for determining the pH and the third detection instrument for determining the volume percentage of the O2 respectively to obtain the mass percentage of the Cl-, the pH and the volume percentage of the O2 of the soil layer around the standard underground concrete structure steel sample at least 5 detection points.
8. The nondestructive diagnosis method for corrosion of steel of an underground concrete structure according to claim 7, wherein the first detecting instrument for measuring mass percentage of Cl-, the second detecting instrument for measuring pH-and the third detecting instrument for measuring volume percentage of O2 are respectively provided with a pull rope.
9. The nondestructive diagnosis method for the corrosion of the underground concrete structure steel according to claim 1, wherein the distance between the position where the standard underground concrete structure steel sample is placed and the position where the underground concrete structure steel to be measured is placed is not more than 100 m.
10. the nondestructive diagnosis method for the corrosion of steel of underground concrete structure according to claim 1, characterized in that the nondestructive diagnosis method for the corrosion of steel of underground concrete structure further comprises the steps of,
For the detection point to be detected, measuring the mass percentage content of Cl < - >, the pH value and the volume percentage content of O2 at intervals of set time for multiple times;
Respectively substituting the mass percentage content of Cl < - > obtained through multiple times of measurement, the pH value and the volume percentage content of O2 into the fourth function relational expression, and calculating to obtain the corrosion percentage at the detection point to be detected;
And drawing a curve with the ordinate as the corrosion percentage of the detection point to be detected and the abscissa as time, namely obtaining a relation curve of the corrosion percentage of the detection point to be detected changing along with time.
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| CN101334353B (en) * | 2008-08-01 | 2010-12-08 | 厦门大学 | Multifunctional sensor for monitoring reinforced concrete structure erosion |
| JP2012198120A (en) * | 2011-03-22 | 2012-10-18 | Seiko Epson Corp | Sensor device |
| JP2013242163A (en) * | 2012-05-17 | 2013-12-05 | Shikoku Res Inst Inc | Corrosion progress prediction method and corrosion progress prediction apparatus |
| CN103063564A (en) * | 2013-01-15 | 2013-04-24 | 安徽省电力科学研究院 | Comprehensive evaluation method of erosion condition of electric transmission and transformation equipment earthing material |
| CN103278616B (en) * | 2013-05-31 | 2016-05-04 | 国网江西省电力科学研究院 | A kind of multiple-factor method of soil corrosivity Fast Evaluation |
| CN103487480B (en) * | 2013-09-29 | 2015-06-03 | 北京航空航天大学 | Method for rapidly predicting service life of reinforced concrete in chlorine salt environment |
| CN104122196B (en) * | 2014-07-15 | 2017-06-20 | 北京工业大学 | Oil-gas pipeline high-strength steel DC stray current corrosion evaluation method under stress condition |
| CN104729982B (en) * | 2015-04-10 | 2017-05-10 | 北京科技大学 | Method of monitoring rusting risk of reinforcement in concrete in situ |
| CN205067300U (en) * | 2015-10-23 | 2016-03-02 | 国网天津市电力公司 | Experimental device for soil influences carbon steel grounding material |
| CN105910977A (en) * | 2016-03-22 | 2016-08-31 | 全球能源互联网研究院 | Power transmission and transformation grounding material soil environment corrosivity comprehensive evaluation method |
| CN106018261A (en) * | 2016-05-23 | 2016-10-12 | 南京航空航天大学 | Electrochemical rapid detection method for reinforcement corrosion degree in concrete structure |
| JP6543221B2 (en) * | 2016-06-02 | 2019-07-10 | 日本電信電話株式会社 | Soil corrosion test apparatus and test method thereof |
| CN205898650U (en) * | 2016-07-19 | 2017-01-18 | 青岛理工大学 | Monitoring system for durability deterioration evolution of reinforced concrete structure |
| CN206772789U (en) * | 2017-05-11 | 2017-12-19 | 河钢股份有限公司 | A kind of indoor acceleration test apparatus for simulating soil correction test |
| CN107655818B (en) * | 2017-09-20 | 2020-01-31 | 国网山东省电力公司电力科学研究院 | indoor rapid evaluation method for soil corrosivity of grounding engineering |
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