CN102288534B - Fiber grating reinforced concrete rusting sensor with temperature compensation - Google Patents
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- 239000000835 fiber Substances 0.000 title claims abstract description 43
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 17
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 15
- 239000010935 stainless steel Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 230000007797 corrosion Effects 0.000 claims description 30
- 238000005260 corrosion Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 239000013307 optical fiber Substances 0.000 claims description 11
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000005538 encapsulation Methods 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000011155 quantitative monitoring Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 2
- 238000000034 method Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 238000000411 transmission spectrum Methods 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
技术领域 technical field
本发明属于结构工程和光纤传感技术领域，涉及到一种带有温度补偿的光纤光栅钢筋混凝土锈蚀传感器。The invention belongs to the technical field of structural engineering and optical fiber sensing, and relates to an optical fiber grating reinforced concrete corrosion sensor with temperature compensation.
背景技术 Background technique
光纤光栅是用于长期监测的理想传感元件，它具有高分辨率、高精度、体积小、耐久性好、抗电磁干扰、可进行长距离准分布式实时监测等优点，因而在结构健康监测传感技术中有广阔的应用前景，尤其在测量应力和应变的场合，具有其它一些传感器无法比拟的优点，被认为是智能结构中最有希望集成在材料内部，探测其损伤的传感器。目前，已有一些将光纤光栅用于检测钢筋腐蚀的监测的传感器设计方案。Fiber Bragg Grating is an ideal sensing element for long-term monitoring. It has the advantages of high resolution, high precision, small size, good durability, anti-electromagnetic interference, and long-distance quasi-distributed real-time monitoring. Therefore, in structural health monitoring Sensing technology has broad application prospects, especially in the occasion of measuring stress and strain. It has advantages that some other sensors cannot match. It is considered to be the most promising sensor integrated inside the material in smart structures to detect its damage. At present, there are some sensor designs that use fiber gratings to detect steel corrosion.
梁大开、王彦等设计了一种长周期光纤光栅的钢筋腐蚀监测方法及其传感器(CN200710021728)，利用贴着钢筋的位置平直地放置一根长周期光纤光栅，定期由光谱仪观察长周期光纤光栅的透射谱变化，以此判断光栅是否发生了弯曲，并推断钢筋腐蚀的程度与速率。该发明通过对埋入的长周期光纤光栅的透射谱监测，可以对钢筋混凝土构件中的钢筋腐蚀情况进行监测。但该传感器不能真实有效的反应钢筋和混凝土之间的界面，另外监测精度不高，传感器的封装也存在一定问题，较难在工程实践中应用。Liang Dakai, Wang Yan, etc. designed a long-period fiber grating steel corrosion monitoring method and its sensor (CN200710021728), using a position close to the steel bar to place a long-period fiber grating flatly, and regularly observe the long-period fiber grating by a spectrometer The changes in the transmission spectrum of the grating can be used to judge whether the grating is bent, and to infer the degree and rate of steel corrosion. The invention can monitor the corrosion of steel bars in reinforced concrete components by monitoring the transmission spectrum of the embedded long-period fiber grating. However, the sensor cannot truly and effectively reflect the interface between steel bars and concrete. In addition, the monitoring accuracy is not high, and there are certain problems in the packaging of the sensor, which is difficult to apply in engineering practice.
董飒英、王洪仁等发明了一种实时监控金属腐蚀的敏感膜光纤传感器及其制备方法(CN200410035475)。它包括金属外壳和设置在金属外壳内并连接金属外壳的测量部分，测量部分是由FRP等强度梁和贴在FRP等强度梁上下表面的两根光纤光栅组成，光纤光栅的引出线穿过金属外壳并引出，金属外壳的内壁设有金属挡板，上面设置有电石，金属外壳下方设置有传力杆，传力杆一端与金属外壳内壁之间设有预压小刚度弹簧，传力杆的另一端设置有FRP圆盘。但该腐蚀传感器构造复杂，价格昂贵，并且不能真实有效的反应钢筋和混凝土之间的界面，难以应用到钢筋混凝土界面上。Dong Saying, Wang Hongren and others invented a sensitive film optical fiber sensor for real-time monitoring of metal corrosion and its preparation method (CN200410035475). It includes a metal casing and a measuring part set in the metal casing and connected to the metal casing. The measuring part is composed of an FRP equal-strength beam and two fiber gratings attached to the upper and lower surfaces of the FRP equal-strength beam. The lead wire of the fiber grating passes through the metal The shell is drawn out. The inner wall of the metal shell is provided with a metal baffle, and calcium carbide is set on it. A dowel bar is set under the metal shell. The other end is provided with an FRP disc. However, the structure of the corrosion sensor is complex and expensive, and it cannot truly and effectively respond to the interface between steel bars and concrete, so it is difficult to apply to the interface of reinforced concrete.
因此，目前在应用光纤布拉格光栅监测锈蚀方面虽有相关研究，但还不能有效地定量精确监测混凝土结构内部钢筋的锈蚀。Therefore, although there are related researches on the application of fiber Bragg gratings to monitor corrosion, it is still unable to effectively and quantitatively monitor the corrosion of steel bars inside concrete structures.
发明内容 Contents of the invention
本发明要解决的技术问题是提供一种监测钢筋混凝土结构锈蚀程度的传感器，用来监测由于混凝土碳化或氯离子渗透到钢筋表面所导致的钢筋混凝土结构中钢筋锈蚀的情况，尤其是对钢筋锈蚀程度的定量实时监测。The technical problem to be solved by the present invention is to provide a sensor for monitoring the corrosion degree of reinforced concrete structures, which is used to monitor the corrosion of steel bars in reinforced concrete structures caused by carbonization of concrete or penetration of chloride ions into the surface of steel bars, especially for steel bar corrosion. Quantitative real-time monitoring of the degree.
本发明的技术方案是：Technical scheme of the present invention is:
一种带有温度补偿的光纤光栅钢筋混凝土锈蚀传感器包括传感探头、不锈钢垫块、粘有应变监测光纤光栅的金属片、应变监测光纤光栅、粘有温度补偿光纤光栅的金属片、温度补偿光纤光栅、弹簧、封装部件和铠装光缆。A fiber grating reinforced concrete corrosion sensor with temperature compensation includes a sensing probe, a stainless steel pad, a metal sheet bonded with a strain monitoring fiber grating, a strain monitoring fiber grating, a metal sheet bonded with a temperature compensation fiber grating, and a temperature compensating optical fiber Optical gratings, springs, potting components and armored cables.
该传感器利用工程中实际应用的钢筋材料制作成传感探头，利用耐腐蚀、耐久性好、刚度高的材料制作封装部件；封装部件侧面有一个与传感探头相匹配的孔，使传感探头穿过该孔后一端面可与混凝土接触形成钢筋材料与混凝土的界面，而传感探头的另一端与位于传感器内部的不锈钢垫块相连接；不锈钢垫块再通过其两个支点与粘有应变监测光纤光栅的金属片相接触；再在不锈钢垫块和封装部件之间安装弹簧；同时在传感器内部放置不受应力干扰的粘有温度补偿光纤光栅的金属片，修正环境温度对应变监测影响；最后光纤经过铠装光缆保护后从传感器内部引出。The sensor is made of the steel bar material actually used in engineering to make the sensing probe, and the packaging part is made of corrosion-resistant, durable, and high-rigidity materials; there is a hole on the side of the packaging part that matches the sensing probe, so that the sensing probe After passing through the hole, one end surface can be in contact with the concrete to form the interface between the reinforced material and the concrete, and the other end of the sensing probe is connected to the stainless steel pad inside the sensor; the stainless steel pad is then connected to the bonded strain through two fulcrums The metal sheet of the monitoring fiber grating is in contact; then a spring is installed between the stainless steel pad and the packaging part; at the same time, a metal sheet with a temperature-compensating fiber grating that is not disturbed by stress is placed inside the sensor to correct the influence of the ambient temperature on strain monitoring; Finally, the optical fiber is led out from the inside of the sensor after being protected by an armored optical cable.
在实际应用过程中，该传感器可以安装在钢筋表面附近，也可以直接布置在钢筋混凝土结构保护层中。当混凝土碳化深度或氯离子到达传感探头位置时，传感探头与混凝土接触的一端发生锈蚀，传感探头锈蚀后发生体积膨胀，推动传感探头向传感器内部运动，进而使粘有应变监测光纤光栅的金属片产生变形。通过应变监测光纤光栅监测到的变形情况，即可实现对传感探头锈蚀程度的定量监测，由于传感探头的材质与工程实际中应用的钢筋相同，因而能够准确的反应出传感探头附近或与传感探头处于相同环境中的钢筋的锈蚀情况，再通过传感器内部的温度补偿光纤光栅来修正环境温度对钢筋锈蚀监测的影响，使钢筋锈蚀监测更加精确的同时，实现了钢筋混凝土结构内部温度的测量。该传感器中弹簧用于抵抗混凝土浇筑过程中对传感探头的冲击力，避免混凝土浇筑过程中由于冲击力过大导致传感探头向传感器内部发生大的位移，致使应变监测光纤光栅破坏。In the actual application process, the sensor can be installed near the surface of the steel bar, or directly arranged in the protective layer of the reinforced concrete structure. When the concrete carbonation depth or chloride ions reach the position of the sensing probe, the end of the sensing probe in contact with the concrete will be corroded, and the volume of the sensing probe will expand after being corroded, pushing the sensing probe to move inside the sensor, and then sticking the strain monitoring optical fiber The metal sheet of the grating is deformed. Quantitative monitoring of the corrosion degree of the sensing probe can be realized through strain monitoring of the deformation monitored by the fiber grating. Since the material of the sensing probe is the same as the steel bar used in engineering practice, it can accurately reflect the surrounding or Corrosion of steel bars in the same environment as the sensor probe, and then correct the influence of ambient temperature on steel bar corrosion monitoring through the temperature compensation fiber grating inside the sensor, so that the steel bar corrosion monitoring is more accurate and at the same time, the internal temperature of reinforced concrete structures is realized. Measurement. The spring in the sensor is used to resist the impact force on the sensing probe during the concrete pouring process, so as to avoid the large displacement of the sensing probe to the inside of the sensor due to excessive impact force during the concrete pouring process, resulting in damage to the strain monitoring fiber grating.
本发明的效果和益处是测量精度高，可对钢筋锈蚀进行实时定量监测、不破坏钢筋混凝土界面并且可同步实现钢筋混凝土结构内部的温度监测。The effects and benefits of the invention are high measurement accuracy, real-time quantitative monitoring of steel bar corrosion, no damage to the reinforced concrete interface and simultaneous realization of temperature monitoring inside the reinforced concrete structure.
附图说明 Description of drawings
图1是带有温度补偿的光纤光栅钢筋混凝土锈蚀传感器的横截面示意图。Figure 1 is a schematic cross-sectional view of a fiber grating reinforced concrete corrosion sensor with temperature compensation.
图2是带有温度补偿的光纤光栅钢筋混凝土锈蚀传感器的纵截面示意图。Fig. 2 is a longitudinal section diagram of a fiber grating reinforced concrete corrosion sensor with temperature compensation.
图中：1传感探头；2不锈钢垫块；3粘有应变监测光纤光栅的金属片；4应变监测光纤光栅；5粘有温度补偿光纤光栅的金属片；6温度补偿光纤光栅；7弹簧；8封装部件；9铠装光缆。In the figure: 1 sensing probe; 2 stainless steel block; 3 metal sheet with strain monitoring fiber grating; 4 strain monitoring fiber grating; 5 metal sheet with temperature compensation fiber grating; 6 temperature compensation fiber grating; 7 spring; 8 package parts; 9 armored optical cable.
具体实施方式 Detailed ways
以下结合技术方案和附图详细叙述本发明的具体实施方式。The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
一种带有温度补偿的光纤光栅钢筋混凝土锈蚀传感器包括传感探头、不锈钢垫块、粘有应变监测光纤光栅的金属片、应变监测光纤光栅、粘有温度补偿光纤光栅的金属片、温度补偿光纤光栅、弹簧、封装部件和铠装光缆。该传感器可以用来监测桥墩，承台，梁，柱等重要结构物构件中钢筋的锈蚀情况。A fiber grating reinforced concrete corrosion sensor with temperature compensation includes a sensing probe, a stainless steel pad, a metal sheet bonded with a strain monitoring fiber grating, a strain monitoring fiber grating, a metal sheet bonded with a temperature compensation fiber grating, and a temperature compensating optical fiber Optical gratings, springs, potting components and armored cables. The sensor can be used to monitor the corrosion of steel bars in bridge piers, caps, beams, columns and other important structural components.
现以应用该传感器监测圆柱形桥墩中钢筋的锈蚀为例来具体说明。首先利用与桥墩中的受力钢筋相同的钢筋材料制作成传感探头，利用不锈钢材料制作封装部件；同时在封装部件侧面开一个与传感探头相匹配的孔，使传感探头穿过该孔后一端面可与混凝土接触形成钢筋材料与混凝土的界面，而传感探头的另一端与位于传感器内部的不锈钢垫块相连接；不锈钢垫块再通过其两个支点与粘有应变监测光纤光栅的金属片相接触；再在不锈钢垫块和封装部件之间安装弹簧；同时在传感器内部放置不受应力干扰的粘有温度补偿光纤光栅的金属片来修正环境温度对应变监测的影响；最后光纤用铠装光缆保护后从传感器内部引出。Now take the application of the sensor to monitor the corrosion of steel bars in cylindrical bridge piers as an example to illustrate in detail. Firstly, the sensor probe is made of the same steel bar as the stressed steel bar in the pier, and the packaged part is made of stainless steel; at the same time, a hole matching the sensor probe is opened on the side of the package part, so that the sensor probe passes through the hole The latter end surface can be in contact with the concrete to form the interface between the reinforced material and the concrete, while the other end of the sensing probe is connected to the stainless steel pad inside the sensor; The metal sheets are in contact; then install a spring between the stainless steel spacer and the packaging part; at the same time, place a metal sheet with a temperature-compensated fiber grating that is not disturbed by stress inside the sensor to correct the influence of the ambient temperature on the strain monitoring; finally, the optical fiber is used The armored optical cable is led out from the inside of the sensor after protection.
传感器制作完成后，将其用细铁丝固定在钢筋表面，固定时令其传感探头朝向圆柱形桥墩的外侧。当混凝土碳化深度或氯离子到达传感探头位置时，传感探头与混凝土接触的一端发生锈蚀，传感探头锈蚀后产生体积膨胀，推动传感探头向传感器内部运动，进而使粘有应变监测光纤光栅的金属片产生变形。通过应变监测光纤光栅监测到的变形情况，即可实现对传感探头锈蚀程度的定量监测，由于传感探头的材质与桥墩中应用的钢筋相同，因而能够准确的反应出传感探头附近以及与传感探头处于相同环境中的钢筋的锈蚀情况，再通过传感器内部的温度补偿光纤光栅来修正环境温度对钢筋锈蚀监测的影响，使钢筋锈蚀监测更加精确的同时，实现了桥墩内部温度的测量。该传感器中弹簧用于抵抗混凝土浇筑过程中对传感探头的冲击力，避免混凝土浇筑过程中由于冲击力过大导致传感探头向传感器内部发生大的位移，致使应变监测光纤光栅破坏。After the sensor is made, it is fixed on the surface of the steel bar with a thin iron wire, and its sensor probe faces the outside of the cylindrical pier when fixed. When the concrete carbonation depth or chloride ions reach the position of the sensing probe, the end of the sensing probe in contact with the concrete will be corroded, and the volume of the sensing probe will expand after corrosion, pushing the sensing probe to move inside the sensor, and then sticking the strain monitoring optical fiber The metal sheet of the grating is deformed. The deformation monitored by the strain monitoring fiber grating can realize the quantitative monitoring of the corrosion degree of the sensing probe. Since the material of the sensing probe is the same as the steel bar used in the bridge pier, it can accurately reflect the vicinity of the sensing probe and the The sensor probe is in the corrosion of the steel bars in the same environment, and then the temperature compensation fiber grating inside the sensor is used to correct the influence of the ambient temperature on the steel bar corrosion monitoring, which makes the steel bar corrosion monitoring more accurate and realizes the measurement of the internal temperature of the pier. The spring in the sensor is used to resist the impact force on the sensing probe during the concrete pouring process, so as to avoid the large displacement of the sensing probe to the inside of the sensor due to excessive impact force during the concrete pouring process, resulting in damage to the strain monitoring fiber grating.
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| CN102928580B (en) * | 2012-11-20 | 2014-11-05 | 郑州大学 | Corrosion monitoring device and method for reinforcement bar in concrete structure |
| CN103616325B (en) * | 2013-11-27 | 2015-10-28 | 中交天津港湾工程研究院有限公司 | Light fiber sensor combination is used in a kind of steel reinforced concrete erosion monitoring |
| CN104101307B (en) * | 2014-07-24 | 2016-08-17 | 河海大学 | A kind of measurement reinforcing bar temperature, fiber grating strain meter of strain simultaneously |
| CN104483258B (en) * | 2014-12-02 | 2017-02-22 | 浙江大学 | Corrosion-fatigue testing method for reinforced concrete on basis of optical-fiber sensing and device thereof |
| CN104849200B (en) * | 2015-05-22 | 2017-10-27 | 宋世德 | A FBG metal corrosion sensor with temperature compensation function and manufacturing method thereof |
| CN105300944B (en) * | 2015-11-11 | 2018-09-28 | 中国船舶重工集团公司第七二五研究所 | A kind of concrete chloride ion corrosion fibre optical sensor and its detection method based on fluorescent quenching |
| CN105334221B (en) * | 2015-11-23 | 2017-12-26 | 天津城建大学 | New reinforcing steel bar corrosion fiber parametric amplification device |
| CN112284270B (en) * | 2020-11-09 | 2021-08-20 | 燕山大学 | A metal surface corrosion monitoring device based on fiber grating with temperature compensation |
| CN113008146A (en) * | 2021-02-26 | 2021-06-22 | 深圳大学 | Optical fiber sensing device, pipeline corrosion monitoring system and method |
| CN113089413B (en) * | 2021-04-21 | 2022-04-15 | 哈尔滨工业大学 | A kind of intelligent dowel rod with embedded distributed optical fiber and its manufacturing method |
| CN113959935B (en) * | 2021-11-02 | 2023-05-19 | 燕山大学 | A steel bar corrosion monitoring device in reinforced concrete members |
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| CN101008620B (en) * | 2007-01-30 | 2010-05-19 | 南京航空航天大学 | Detection method of reinforcement corrosion in reinforced concrete members |
| JP5182929B2 (en) * | 2008-05-21 | 2013-04-17 | 大成建設株式会社 | Reinforcing method for existing concrete structures |
| CN201331395Y (en) * | 2009-01-19 | 2009-10-21 | 北京交通大学 | Fibre grating temperature compensation transducer |
| CN101923057B (en) * | 2010-04-29 | 2012-07-04 | 大连理工大学 | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor |
| CN202166600U (en) * | 2011-05-10 | 2012-03-14 | 大连理工大学 | A Fiber Bragg Grating Reinforced Concrete Corrosion Sensor with Temperature Compensation |
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