CN113504301A - Steel bar corrosion monitoring sensor and use method thereof - Google Patents
Steel bar corrosion monitoring sensor and use method thereof Download PDFInfo
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- CN113504301A CN113504301A CN202110660518.8A CN202110660518A CN113504301A CN 113504301 A CN113504301 A CN 113504301A CN 202110660518 A CN202110660518 A CN 202110660518A CN 113504301 A CN113504301 A CN 113504301A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The utility model provides a reinforcing bar corrosion monitoring sensor, includes n ceramic piezoelectricity acoustic emission sensor, n signal acquisition line, n acoustic signal amplifier, n signal output line, signal receiver and is used for gathering the signal analyzer of analysis reinforcing bar corrosion condition according to the signal that ceramic piezoelectricity acoustic emission sensor gathered, n is more than or equal to 4's integer, the ceramic sensor of burying in the concrete inside in ceramic piezoelectricity acoustic emission sensor, ceramic piezoelectricity acoustic emission sensor passes through the signal acquisition line and is connected with acoustic signal amplifier, and n acoustic signal amplifier passes through the signal output line and is connected with signal receiver, signal receiver is connected with signal analyzer. And provides a using method of the steel bar corrosion monitoring sensor. The method is simple and convenient to operate, suitable for various reinforced concrete members, high in accuracy, low in cost and strong in engineering applicability.
Description
Technical Field
The invention relates to a steel bar corrosion monitoring sensor and a use method thereof, in particular to a steel bar corrosion monitoring sensor based on an acoustic emission principle and a use method thereof.
Background
Concrete materials are widely used in the field of civil engineering as the most widely used building materials today. The corrosion of steel bars is the main cause of the rust cracking failure of the concrete structure, and the rust expansion cracking of the reinforced concrete structure caused by the corrosion of the steel bars is the important cause of the reduction of the bearing capacity and the service performance of the structure. According to data published by the Chinese academy of sciences oceans: the corrosion loss of China is up to 1.6 trillion yuan each year, wherein the corrosion loss of infrastructure and buildings is up to 5000 trillion yuan.
Therefore, the long-term monitoring of the steel bars after the service of the reinforced concrete structure is very important, and if the steel bars are monitored and found in the early stage of structure cracking caused by rusting, the steel bars can be maintained in time, so that the service life of the structure can be greatly prolonged.
In the field of civil engineering, corrosion detection methods are generally divided into damage Detection (DT) and non-destructive detection (NDT), wherein the corrosion detection method is to take out a steel bar through a broken type, obtain the corrosion rate by detecting the diameter and the weight of the steel bar after mechanical or chemical rust removal, and generally damage a member to a certain degree and cannot be widely applied although the detection result is relatively accurate; nondestructive testing (NDT) is a hotspot of current research, and is currently expanded to aspects such as hydration monitoring, detection of water content in concrete, detection of steel bar corrosion, detection of steel bar position and the like.
In nondestructive testing, an acoustic emission technique is a common technique, and can be used for judging the occurrence condition of corrosion mainly by analyzing basic parameters of acoustic signals such as accumulated impact number and the like.
In recent years, it has become a common concrete monitoring means to research the stability and safety of concrete structures, evaluate the damage degree, locate the cracking position and monitor and predict the structural instability by using the acoustic emission technology. Basic rules have been established through the study of acoustic emission characteristics of concrete materials during the destruction process.
Based on the background, the Chinese patent No. CN103575805A, which is filed as 2, 12 and 2014, is named as an ultrasonic monitoring sensor and usage for the corrosion of the steel bar in the concrete, and the Chinese patent No. CN107345875A, which is filed as 11, 14 and 2017, is named as a rigidity evaluation method for the reinforced concrete flexural member based on acoustic emission ringing counting, and the like, provide a sensor and usage for monitoring the corrosion of the steel bar in the reinforced concrete structure based on the acoustic emission principle.
The sensor achieves the effect of monitoring the corrosion signal by embedding a group of acoustic signals to transmit and receive piezoelectric ceramics. However, the positioning error of a single set of sensors often reaches 5mm, and a certain distance is provided compared with the high-precision positioning capable of being applied in engineering.
Moreover, the single group of sensors can only be used for monitoring a single reinforcing steel bar, and beams, plates and columns of reinforced concrete members in common forms in engineering all work together with a plurality of reinforcing steel bars. Under the condition that reinforcing bar corrosion position can't be confirmed, in order to satisfy global monitoring, all install the sensor on many reinforcing bars, this kind of mounting means neither is economical nor reliable.
The above problems are urgently needed to be solved. Therefore, a high-precision corrosion monitoring mode is developed, the engineering value is very important, the efficiency of monitoring the corrosion of the steel bars can be greatly improved, and the society is benefited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the steel bar corrosion sensor which is simple and convenient to operate, suitable for various reinforced concrete members, high in accuracy, low in cost and strong in engineering applicability and the using method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a reinforcing bar corrosion monitoring sensor, includes n ceramic piezoelectricity acoustic emission sensor, n signal acquisition line, n acoustic signal amplifier, n signal output line, signal receiver and is used for gathering the signal analyzer of analysis reinforcing bar corrosion condition according to the signal that ceramic piezoelectricity acoustic emission sensor gathered, n is more than or equal to 4's integer, the ceramic sensor of burying in the concrete inside in ceramic piezoelectricity acoustic emission sensor, ceramic piezoelectricity acoustic emission sensor passes through the signal acquisition line and is connected with acoustic signal amplifier, and n acoustic signal amplifier passes through the signal output line and is connected with signal receiver, signal receiver is connected with signal analyzer.
Further, the ceramic piezoelectric acoustic emission sensor is installed on a steel bar with a determined position and fixed through a binding wire.
A method for using a reinforced concrete corrosion monitoring sensor comprises the steps of firstly, determining installation positions of n ceramic piezoelectric acoustic emission sensors according to the size of a reinforced concrete structure to be monitored, wherein n is an integer greater than or equal to 4, installing and fixing the n sensors at the determined positions through binding wires before the structure is poured, and ensuring that the n sensors are installed on the same plane; connecting two ends of the n signal acquisition lines with the embedded sensor and the acoustic signal amplifier respectively; the acoustic signal amplifier is connected with the signal receiver through n signal output lines; connecting the signal receiver with the signal analyzer through a data connecting line; reading before concrete pouring to ensure normal reading of the sensor; and (5) after the concrete is poured and maintained, monitoring the corrosion condition of the structure by using a corrosion monitoring device.
The invention has the following beneficial effects: the invention can overcome the defects of difficult corrosion monitoring and low precision of each size member in the actual engineering and realize the monitoring process of each concrete member corrosion reinforcing steel bar; the sensor can adjust the installation position according to the size of the component, and further realize the monitoring of the corrosion condition of each component, has the advantages of clear principle, simple method, accurate positioning and the like, and can make up the vacancy of the existing monitoring device.
Drawings
FIG. 1 is a schematic diagram of the connection of the present invention.
FIG. 2 is a top view of the structure of the present invention.
Fig. 3 is a left side view of the structure of the present invention.
Fig. 4 is a front view of the structure of the present invention.
Fig. 5 is a graph of corrosion degree analysis.
Reference numbers in the figures: 1. a reinforced concrete member; 21. a first sensor; 22. a second sensor; 23. a third sensor; 24. a fourth sensor; 31. a first signal acquisition line; 32. a second signal acquisition line; 33. a third signal acquisition line; 34. a fourth signal acquisition line; 41. a first acoustic signal amplifier; 42. a second acoustic signal amplifier; 43. a third acoustic signal amplifier; 44. a fourth acoustic signal amplifier; 51. a first signal output line; 52. a second signal output line; 53. a third signal output line; 54. a fourth signal output line; 6. a signal receiver; 7. a data link; 8. a signal analyzer; 91. a first steel bar to be detected; 92. and a second steel bar 2 to be tested.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, a steel bar corrosion monitoring sensor comprises n ceramic piezoelectric acoustic emission sensors, n signal acquisition lines, n acoustic signal amplifiers, n signal output lines, a signal receiver and a signal analyzer for collecting and analyzing the steel bar corrosion condition according to signals acquired by the ceramic piezoelectric acoustic emission sensors, wherein n is an integer greater than or equal to 4, the ceramic sensors are embedded in concrete, the ceramic piezoelectric acoustic emission sensors are connected with the acoustic signal amplifiers through the signal acquisition lines, the n acoustic signal amplifiers are connected with the signal receiver through the signal output lines, and the signal receiver is connected with the signal analyzer.
Further, the ceramic piezoelectric acoustic emission sensor is installed on a steel bar with a determined position and fixed through a binding wire.
In this embodiment, n is 4 as an example. The 4 ceramic piezoelectric acoustic emission sensors comprise a first sensor 21, a second sensor 22, a third sensor 23 and a fourth sensor 24; the 4 signal acquisition lines include a first signal acquisition line 31, a second signal acquisition line 32, a third signal acquisition line 33, and a fourth signal acquisition line 34; the 4 acoustic signal amplifiers include a first acoustic signal amplifier 41, a second acoustic signal amplifier 42, a third acoustic signal amplifier 43, and a fourth acoustic signal amplifier 44; the 4 signal output lines include a first signal output line 51, a second signal output line 52, a third signal output line 53, and a fourth signal output line 54.
The reinforced concrete member 1 is a reinforced concrete main body for monitoring and is a common building structure;
the first sensor 21, the second sensor 22, the third sensor 23 and the fourth sensor 24 are ceramic sensors embedded in the concrete, and can convert acoustic signals into electric signals to be transmitted;
the first signal acquisition line 31, the second signal acquisition line 32, the third signal acquisition line 33 and the fourth signal acquisition line 34 are used for connecting the sensor and the acoustic signal amplifier and transmitting signals;
the first acoustic signal amplifier 41, the second acoustic signal amplifier 42, the third acoustic signal amplifier 43 and the fourth acoustic signal amplifier 44 can amplify weak electric signals transmitted by the sensor, so that the signals can be conveniently collected and analyzed;
the first signal output line 51, the second signal output line 52, the third signal output line 53 and the fourth signal output line 54 are used for connection between the acoustic signal amplifier and the signal receiver and signal transmission;
the signal receiver 6 is used for summarizing the electric signals transmitted by the four sensors and transmitting the electric signals to a signal analyzer (computer);
the connecting line is used for connecting the signal receiver and the signal analyzer (computer) and transmitting signals;
the signal analyzer 8 is used for summarizing and analyzing signals.
The concrete monitoring process of the invention takes the corrosion monitoring of a reinforced concrete slab as an example: firstly, determining the installation positions of four sensors according to the size of the reinforced concrete structure monitored at this time; before the structure is poured, a first sensor 21, a second sensor 22, a third sensor 23 and a fourth sensor 24 are installed on a steel bar at a determined position and are fixed through binding wires, and the four sensors are ensured to be installed on the same plane; the first, second, third and fourth signal collection lines 31, 32, 33, 34 are connected at both ends to the first, second, third and fourth sensors 21, 22, 23, 24, the first, second, third and fourth acoustic signal amplifiers 41, 42, 43, 44, respectively; the first acoustic signal amplifier 41, the second acoustic signal amplifier 42, the third acoustic signal amplifier 43, and the fourth acoustic signal amplifier 44 are connected to the signal receiver 6 through a first signal output line 51, a second signal output line 52, a third signal output line 53, and a fourth signal output line 54; the signal receiver 6 is connected with a signal analyzer 8 through a data connection line 7; reading before concrete pouring to ensure normal reading of the sensor; and (5) after the concrete is poured and maintained, monitoring the corrosion condition of the structure by using a corrosion monitoring device.
The positioning mode of the invention is two-dimensional plane positioning, and the only sound source position meeting the receiving time of four sound signals can be obtained through the cross analysis of the sound signals of the four sensors, thereby achieving the function of rust positioning; the acoustic frequency used by the device is 30MHZ, and is the acoustic frequency used for positioning; the sound signal amplifier is 40Db, and the test can completely meet the amplification requirement of the sound signal. The acoustic signal parameters which can be collected by the device comprise ringing counts, acoustic signal positioning points and the like, and the acoustic signal parameters can be used for analyzing the corrosion degree and the corrosion position of the reinforced concrete structure and realizing the nondestructive testing of the corrosion of the reinforced concrete.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (3)
1. The utility model provides a reinforcing bar corrosion monitoring sensor, its characterized in that includes n ceramic piezoelectricity acoustic emission sensor, n signal acquisition line, n acoustic signal amplifier, n signal output line, signal receiver and is used for gathering the signal analyzer of analysis reinforcing bar corrosion condition according to the signal that ceramic piezoelectricity acoustic emission sensor gathered, n is more than or equal to 4's integer, the ceramic sensor of ceramic piezoelectricity acoustic emission sensor embedded in the concrete inside, ceramic piezoelectricity acoustic emission sensor passes through the signal acquisition line and is connected with the acoustic signal amplifier, and n acoustic signal amplifier passes through the signal output line and is connected with signal receiver, signal receiver is connected with signal analyzer.
2. The steel bar corrosion monitoring sensor according to claim 1, wherein the ceramic piezoelectric acoustic emission sensor is mounted on the steel bar at a determined position and fixed by a binding wire.
3. The use method of the steel bar corrosion monitoring sensor according to claim 1, wherein firstly, according to the size of the current reinforced concrete structure to be monitored, n ceramic piezoelectric acoustic emission sensors are determined to be installed at certain positions, n is an integer greater than or equal to 4, and before the structure is poured, the n sensors are installed at the certain positions through binding wires and fixed, so that the n sensors are ensured to be installed on the same plane; connecting two ends of the n signal acquisition lines with the embedded sensor and the acoustic signal amplifier respectively; the acoustic signal amplifier is connected with the signal receiver through n signal output lines; connecting the signal receiver with the signal analyzer through a data connecting line; reading before concrete pouring to ensure normal reading of the sensor; and (5) after the concrete is poured and maintained, monitoring the corrosion condition of the structure by using a corrosion monitoring device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110660518.8A CN113504301A (en) | 2021-06-15 | 2021-06-15 | Steel bar corrosion monitoring sensor and use method thereof |
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| CN202110660518.8A CN113504301A (en) | 2021-06-15 | 2021-06-15 | Steel bar corrosion monitoring sensor and use method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023185A (en) * | 2010-11-12 | 2011-04-20 | 中国农业大学 | Acoustic emission locating detection method for defects of crane boom |
| CN107345875A (en) * | 2017-07-14 | 2017-11-14 | 西安建筑科技大学 | The rigidity appraisal procedure of Reinforced Concrete Members with Flexure based on sound emission Ring-down count |
| CN108956767A (en) * | 2018-06-13 | 2018-12-07 | 天津大学 | Based on frequency-comentropy Corroded Reinforced Concrete fatigue damage evaluation method |
-
2021
- 2021-06-15 CN CN202110660518.8A patent/CN113504301A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023185A (en) * | 2010-11-12 | 2011-04-20 | 中国农业大学 | Acoustic emission locating detection method for defects of crane boom |
| CN107345875A (en) * | 2017-07-14 | 2017-11-14 | 西安建筑科技大学 | The rigidity appraisal procedure of Reinforced Concrete Members with Flexure based on sound emission Ring-down count |
| CN108956767A (en) * | 2018-06-13 | 2018-12-07 | 天津大学 | Based on frequency-comentropy Corroded Reinforced Concrete fatigue damage evaluation method |
Non-Patent Citations (1)
| Title |
|---|
| 王磊 等: "锈蚀钢筋混凝土的黏结性能及声发射信号特征分析", 《铁道建筑》, no. 4, pages 139 - 143 * |
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