CN101666766A - Method for monitoring and positioning concrete cracks by using elastic conducting film sensor and infrared thermal imaging technique - Google Patents
Method for monitoring and positioning concrete cracks by using elastic conducting film sensor and infrared thermal imaging technique Download PDFInfo
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- CN101666766A CN101666766A CN200910104789A CN200910104789A CN101666766A CN 101666766 A CN101666766 A CN 101666766A CN 200910104789 A CN200910104789 A CN 200910104789A CN 200910104789 A CN200910104789 A CN 200910104789A CN 101666766 A CN101666766 A CN 101666766A
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Abstract
The invention discloses a method for monitoring and positioning concrete cracks by using an elastic conducting film sensor and an infrared thermal imaging technique, comprising the following steps: 1)solidifying conductive coatings to form an elastic conducting film, laying the elastic conducting film on a concrete member and arranging leads at two ends of the elastic conducting film to form theelastic conducting film sensor; 2) when discovering cracks on the concrete member or carrying out routine inspection, connecting the leads at two ends of the elastic conducting film to a power supplyto be electrified to generate heat; 3) carrying out scan detection by using an infrared thermal imaging device; and 4) accurately determining the positions, quantity, trends, sizes and other information of the cracks according to the images obtained after scan detection by the infrared thermal imaging device. By the method, the resistivity of the elastic conducting film sensor on the positions ofthe cracks is increased, and the heat output on the positions of the cracks after electrifying is more than that on the common positions. The positions, quantity, trends, sizes and other information of the cracks can be accurately displayed by adopting the infrared thermal imaging device for scanning.
Description
Technical field
The present invention relates to a kind of method that the crack of generations such as concrete dam, concrete structure or concrete component is monitored and located, especially adopt elastic conducting film sensor and infrared thermal imaging technique distress in concrete to be carried out the method for Monitoring and Positioning.
Background technology
In the construction of each side such as house, power station, nuclear power station, mine, airport, highway, dam, bridge, all will adopt cement in a large number, be base stock with cement, pours into various concrete, form reinforced concrete structure, as basic primary structure member.Since reinforcing bar and concrete in long-term use, be subjected to various pressure for a long time, effect repeatedly, just there are potential safety hazard in its inner easy deformation even cracking.To the extra high place of safety requirements,, need carry out continuous monitoring to reinforced concrete especially, guarantee that it security incident does not take place just seems particularly important as places such as nuclear power station, dam, bridges.In the prior art, carry out the continuous monitoring except adopting microscan camera system and GPS Global Positioning System (GPS), also there is a kind of name to be called " dam deformation, cracking automatic monitoring and alarming system ", the patent No. is the Chinese patent technology of ZL98119894, disclose a kind ofly, determined by the variation of monitoring each section conducting concrete resistance whether dam is out of shape or cracks at equidistant laying conducting concrete of dam lateral surface and electrode.In addition, applicant had applied for once that name was called " device of the distortion of a kind of energy continuous monitoring primary structure member, cracking ", the patent No. is the utility model patent of ZL200420034322.X, be embedded with elastic electric conductor or elastic electric conductor is set in its surface in primary structure member, the two ends of elastic electric conductor are all inserted in the chromacoder respectively; Different situations such as elastic electric conductor is stressed along with primary structure member respectively, distortion, cracking, destruction, its internal resistance value respective change, through processor controls analysis, processing, can clearly point out primary structure member the residing stage, states such as cracking, destruction are sent alerting signal; Can do round-the-clock, automatic monitor for continuously early warning.But, whether said apparatus all can only monitor primary structure members such as concrete and be out of shape, ftracture, and behind distortion, cracking, in time send alerting signal, can not demonstrate the accurate position of distortion, cracking point, can not demonstrate a point or distortion, cracking have taken place a plurality of point, can not obtain the details of fracture strike, size etc., more not have open method how to measure above-mentioned distortion, the accurate position of cracking point.
Summary of the invention
Whether the present invention is directed to monitoring device of the prior art can only monitor primary structure members such as concrete and be out of shape, ftracture, can not demonstrate the accurate position of distortion, cracking point, can not demonstrate a point or deficiencies such as distortion, cracking have taken place a plurality of point, a kind of primary structure members such as concrete deform, ftracture a little accurate position and obtain the method for information such as fracture strike, size of measuring and demonstrate is provided.
Technical scheme of the present invention: elastic conducting film sensor and infrared thermal imaging technique carry out the method for Monitoring and Positioning to distress in concrete, it is characterized in that comprising the steps:
(1) electrically-conducting paint is solidify to form elastic conducting film (or the conductive rubber band is made), elastic conducting film is laid on the concrete component, also can directly electrically-conducting paint be coated on surface of concrete structure and solidify to form elastic conducting film, at the elastic conducting film two ends lead is set, forms elastic conducting film sensor;
(2) find concrete component produce the crack after or during in routine inspection, the lead at elastic conducting film two ends is connected on the power supply, carry out heating power;
(3) elastic conducting film that is positioned at location of cracks is because this place's resistivity increases, and the energising back produces heat and temperature will be higher than other positions, utilizes the infrared thermal imaging device to scan detection;
(4) according to the image that obtains after the infrared thermal imaging device scanning detection, can accurately determine the position in crack, can also determine that a point still is that a plurality of points have produced the crack, and obtain information such as fracture strike, size.
Further feature is: described elastic conducting film is coated on the surface of concrete structure.
Elastic conducting film sensor of the present invention and infrared thermal imaging technique carry out the method for Monitoring and Positioning to distress in concrete, have following characteristics:
1, electrically-conducting paint is solidify to form elastic conducting film sensor, elastic conducting film sensor resistance is very sensitive to being out of shape, and along with concrete produces the crack, elastic conducting film sensor increases in the resistivity of location of cracks; Therefore, after the energising, bigger than normal position in the thermal value of location of cracks, directly to air heat in the crack, thermal inertia is little simultaneously, and the intensification meeting is apparently higher than the position of not ftractureing, its temperature is higher than other positions, adopts the infrared thermal imaging device to scan, and can accurately demonstrate location of cracks.
2, the present invention adopts elastic conducting film sensor and infrared thermal imaging technique, can accurately demonstrate the accurate position of distortion, cracking point, also can demonstrate a point or distortion, cracking have taken place a plurality of point, and obtain information such as fracture strike, size, for next step patch work lays the foundation.
Description of drawings
Fig. 1 is a positioning system structural representation of the present invention.
Embodiment
Elastic conducting film sensor of the present invention and infrared thermal imaging technique carry out the method for Monitoring and Positioning to distress in concrete, it is characterized in that comprising the steps:
1, electrically-conducting paint is solidify to form elastic conducting film, or make elastic conducting film by the conductive rubber band, elastic conducting film is laid on the concrete component, or directly electrically-conducting paint is coated on surface of concrete structure and solidify to form elastic conducting film, at the elastic conducting film two ends lead is set, forms elastic conducting film sensor; Best mode is to be coated on the surface of concrete structure;
2, find concrete component produce the crack after or during in routine inspection, the lead at elastic conducting film two ends is connected on the power supply, carry out heating power;
3, the elastic conducting film that is positioned at location of cracks is because this place's resistivity increases, and the energising back produces heat and temperature will be higher than other positions, utilizes the infrared thermal imaging device to scan detection;
4, the image that obtains after scanning detects according to the infrared thermal imaging device can accurately be determined the position in crack and obtain information such as fracture strike, size.
In figure, (coating) elastic conducting film sensor 2 is set on concrete component 1 surface, connect lead 3 respectively at elastic conducting film sensor 2 two ends, lead 3 is connected respectively on the both positive and negative polarity of power supply 4 again, heating power when needing.When concrete component 1 has produced crack 5, to elastic conducting film sensor 2 heating powers, utilize 6 pairs of whole elastic conducting film sensors 2 of infrared thermal imaging device to scan detection, the characteristics big according to the location of cracks thermal value, that temperature is high, scan on the image that obtains after the detection from the infrared thermal imaging device, can accurately determine the position in crack, can also determine that a point still is that a plurality of points have produced the crack.Infrared thermal imaging device 6 be existing, use infrared thermography widely, different according to being scanned the process object temperature, can demonstrate the thermal-induced imagery that is scanned process object.
Applied for once referring to applicant that name was called " device of the distortion of a kind of energy continuous monitoring primary structure member, cracking ", the patent No. is the utility model patent of ZL200420034322.X; Compliant conductive coating is that a kind of property dosed carbon is bi-component modified poly ester electrically-conducting paint, with organic high molecular polymer as bonding agent, form by mixed systems such as Powdered conductive material, auxiliary agents, has excellent flexibility, heat-resistant aging and electric conductivity, in the practice, with elastic polyester class organic high molecular polymer is the best, and Powdered conductive material is carbon dust or metal powder.Main performance: good conductivity (surface resistivity 0.8～1 Ω cm-1), elasticity height (below-40 ℃, fracture elongation 70%), electrothermal efficiency height (electric heating conversion ratio＞95%), good endurance (can semipermanent use under 80 ℃ of temperature), moisture resistance be good.
Above-mentioned compliant conductive paint solidification is formed elastic conducting film, elastic conducting film is laid on the concrete component, lead is set, form elastic conducting film sensor at the elastic conducting film two ends; When elastic conducting film sensor and concrete component when being subjected to various stress, elastic conducting film is stretched in the force part, causes that the micromechanism of elastic conducting film inside changes, one of its form of expression is exactly that its resistivity is along with increase; After concrete component produced the crack, the resistance value of elastic conducting film enlarged markedly.
When finding concrete component cracking back or during in routine inspection, the lead at elastic conducting film sensor two ends received on the external power supply (select suitable voltage), carry out heating power.Utilize infra-red thermal imaging system (device) to carry out the detection of crack location; The detection principle is as follows: elastic conducting film sensor is stretched at location of cracks, and this place's resistivity increases (this position resistance will be several times as much as other positions), and this position unit area power surpasses other positions after the energising, and thermal value is big, the temperature height; Main is, and location of cracks is directly to air heat in the crack, and thermal inertia is little, heats up far above the position of not ftractureing.Therefore utilize the thermal infrared imaging systematic observation, temperature will be the position in crack apparently higher than the position of background; The image that obtains after scanning detects according to the infrared thermal imaging device can accurately be determined the position in crack and obtain information such as fracture strike, size.
Claims (2)
1, elastic conducting film sensor and infrared thermal imaging technique carry out the method for Monitoring and Positioning to distress in concrete, it is characterized in that comprising the steps:
(1) electrically-conducting paint is solidify to form elastic conducting film, or make elastic conducting film by the conductive rubber band, elastic conducting film is laid on the concrete component, or electrically-conducting paint is coated on surface of concrete structure solidify to form elastic conducting film, at the elastic conducting film two ends lead is set, forms elastic conducting film sensor;
(2) finding that concrete component produces the crack or during, the lead at elastic conducting film sensor two ends is being connected on the power supply, carrying out heating power in routine inspection;
(3) elastic conducting film that is positioned at location of cracks produces heat and temperature and will be higher than other positions because this place's resistivity increases, and utilizes the infrared thermal imaging device to scan detection;
(4) image that obtains after detecting according to infrared thermal imaging device scanning can accurately be determined the accurate position in crack and obtain fracture strike, big or small information.
2, elastic conducting film sensor according to claim 1 and infrared thermal imaging technique carry out the method for Monitoring and Positioning to distress in concrete, and it is characterized in that: described elastic conducting film sensor is coated on the surface of concrete structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910104789A CN101666766A (en) | 2009-09-04 | 2009-09-04 | Method for monitoring and positioning concrete cracks by using elastic conducting film sensor and infrared thermal imaging technique |
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| CN200910104789A CN101666766A (en) | 2009-09-04 | 2009-09-04 | Method for monitoring and positioning concrete cracks by using elastic conducting film sensor and infrared thermal imaging technique |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226685A (en) * | 2011-03-24 | 2011-10-26 | 邓安仲 | Method for detecting width of concrete crack in non-contact mode by utilizing infrared thermal imaging device and elastic conductive membrane |
| CN102565130A (en) * | 2010-12-15 | 2012-07-11 | 财团法人工业技术研究院 | Defect measuring apparatus and defect measuring method |
| CN102735294A (en) * | 2011-04-02 | 2012-10-17 | 苏州科技学院 | Measuring method for wind speed field measurement device based on infrared focal planes and reconstruction technique |
| CN103240218A (en) * | 2013-05-16 | 2013-08-14 | 于百勇 | Subway tunnel concrete crack monitoring element roll coating forming process based on flexible conductive coating |
| CN103983513A (en) * | 2014-05-22 | 2014-08-13 | 中国矿业大学 | Device and method for observing coal rock fracture development process through infrared radiation |
| CN105793699A (en) * | 2013-12-04 | 2016-07-20 | 沃特洛电气制造公司 | Thermographic inspection system |
| CN107655937A (en) * | 2017-08-25 | 2018-02-02 | 南京航空航天大学 | A kind of structural damage monitors in real time and localization method |
| CN109239138A (en) * | 2018-07-31 | 2019-01-18 | 同济大学 | A kind of detection method in concrete structural surface new life crack |
| CN110988660A (en) * | 2019-10-21 | 2020-04-10 | 信利光电股份有限公司 | ITO defect detection method and system |
| CN114216403A (en) * | 2021-12-17 | 2022-03-22 | 河北工业大学 | Discontinuous deformation measurement method based on infrared and visible light double-light camera |
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2009
- 2009-09-04 CN CN200910104789A patent/CN101666766A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565130A (en) * | 2010-12-15 | 2012-07-11 | 财团法人工业技术研究院 | Defect measuring apparatus and defect measuring method |
| CN102226685A (en) * | 2011-03-24 | 2011-10-26 | 邓安仲 | Method for detecting width of concrete crack in non-contact mode by utilizing infrared thermal imaging device and elastic conductive membrane |
| CN102735294A (en) * | 2011-04-02 | 2012-10-17 | 苏州科技学院 | Measuring method for wind speed field measurement device based on infrared focal planes and reconstruction technique |
| CN103240218A (en) * | 2013-05-16 | 2013-08-14 | 于百勇 | Subway tunnel concrete crack monitoring element roll coating forming process based on flexible conductive coating |
| CN105793699A (en) * | 2013-12-04 | 2016-07-20 | 沃特洛电气制造公司 | Thermographic inspection system |
| CN113252723A (en) * | 2013-12-04 | 2021-08-13 | 沃特洛电气制造公司 | Thermal imaging detection system |
| CN103983513B (en) * | 2014-05-22 | 2016-03-02 | 中国矿业大学 | A kind of device and method adopting infrared radiation to observe coal petrography cranny development process |
| CN103983513A (en) * | 2014-05-22 | 2014-08-13 | 中国矿业大学 | Device and method for observing coal rock fracture development process through infrared radiation |
| CN107655937A (en) * | 2017-08-25 | 2018-02-02 | 南京航空航天大学 | A kind of structural damage monitors in real time and localization method |
| CN109239138A (en) * | 2018-07-31 | 2019-01-18 | 同济大学 | A kind of detection method in concrete structural surface new life crack |
| CN110988660A (en) * | 2019-10-21 | 2020-04-10 | 信利光电股份有限公司 | ITO defect detection method and system |
| CN114216403A (en) * | 2021-12-17 | 2022-03-22 | 河北工业大学 | Discontinuous deformation measurement method based on infrared and visible light double-light camera |
| CN114216403B (en) * | 2021-12-17 | 2022-07-01 | 河北工业大学 | Discontinuous deformation measurement method based on infrared and visible light double-light camera |
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Open date: 20100310 |