CN103323385A - Fiber anchor pole corrosion sensor - Google Patents
Fiber anchor pole corrosion sensor Download PDFInfo
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- CN103323385A CN103323385A CN2013102048015A CN201310204801A CN103323385A CN 103323385 A CN103323385 A CN 103323385A CN 2013102048015 A CN2013102048015 A CN 2013102048015A CN 201310204801 A CN201310204801 A CN 201310204801A CN 103323385 A CN103323385 A CN 103323385A
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Abstract
A fiber anchor pole corrosion sensor, belongs to a geotechnical engineering technology field. The fiber anchor pole corrosion sensor is characterized in that: the sensor is composed of a fiber corrosion expansion monitoring unit, a fiber grating temperature compensating unit and a fiber grating stress correction unit in layers, wherein the fiber corrosion expansion monitoring unit, which is a key component, is composed of a porous medium cushion layer, a bare fiber winding layer, an externally-coated cement mortar protective layer and an armoured signal transmission optical cable. The optical fiber is wound on a steel bar anchor pole and a steel strand anchor pole, protective layers are internally and externally arranged, radial expansion strain of the anchor pole caused by corrosion is measured, and quantitative monitor of corrosion degree of an anchor pole steel bar or a steel strand is implemented. The invention provides an anchor pole corrosion monitoring sensor which has advantages of clear principle, high measurement precision, low cost and high endurance, and the anchor pole corrosion monitoring sensor can implement long-term and stable quantitative monitor on a corrosion state of the anchor pole, and makes sure structural safety of the anchor pole.
Description
Technical field
The invention belongs to the Geotechnical Engineering technical field, relate to the corrosion monitoring of reinforcing bar class and steel strand wires class anchor pole, specially refer to the technology of the strain monitoring of Fibre Optical Sensor, optical fiber is wrapped on the anchor pole, measure the expansion strain that anchor pole produces because of corrosion, realize the Quantitative Monitoring to the extent of corrosion of anchor pole reinforcing bar or steel strand wires.
Background technology
As a kind of economy of side slope and roadway support and effective and efficient manner, anchor pole has obtained using widely in engineering, and reinforcing bar class and steel strand wires class anchor pole then are two common class anchor poles.Since the sixties in last century, used anchor pole in large quantities in many railway tunnel of China, national defence people's air defense tunnel, Hydropower Station Underground, ground high slope, harbour bank slope, bridge pier culvert and the base pit engineering.Along with the growth of tenure of use, anchor pole becomes " time bomb " in the engineering, and the safety of whole engineering is had very important effect.Therefore, improving the anchor pole permanance, grasp its safety case, is very crucial problem in science.
Anchor pole is by the stratum of proterties difference, and under the corrosive medium effect in stratum and underground water, anchor pole is easy to corrode, and becomes the major reason that its permanance reduces.So far, anchor pole corrosion failure phenomenon happens occasionally both at home and abroad.Domestic, the prestressed anchor of Anhui Mei Shanshuiku used after 8 years, found in three holes that part steel wire stress corrodes and rupture.The prestressed anchor of southwest side slope uses after 10 years and finds that also rusty stain appears in the anchor head place presstressed reinforcing steel of part anchor pole.Abroad, French Zhu Kesi dam has several anchor rod prestress steel wires only to try to use after the some months, just ruptures because of the corrosive attack under the high drawing stress state.A harbour of Britain road by the Thames, the steel sheet pile construction that adopts the prestressed anchor back of the body to draw.After using 21 years, because the steel strand wires corrosion of anchor pole causes the presstressed reinforcing steel fracture, the outward-dipping 30 meters major accident of steel sheet pile has taken place.Therefore, resolve the anchor pole etching problem and for application and the development of anchorage technology important effect is arranged.
The anchor pole corrosion is subjected to multiple factor affecting such as environment, material and construction.Some common anti-corrosion measures at present also are to set about from these three aspects.On the material selection of anchor pole, preferentially select reliable quality steel and other materials for use, avoid using early strength agent or other adjuvant of Halogen ion.Invented a kind of corrosion resistant fiber anchor pole (patent publication No.: CN201043272), it is said that its corrosion resistance is good as Zhang Yifeng.On work progress, water cement ratio or the concentration of slurry of control mortar, noting during slip casting adopts an effective measure makes that to bond body even, continuous and closely knit, and adopts secondary grouting as far as possible, or in slurries, add an amount of water reducer, improve packing and the impermeability of anchoring body.And, can adopt some constructivity measures, Jiang Chusheng etc. have invented anti-corrosion structure of reinforced anchor bolt in corrosion stratum (patent publication No.: CN101514634), by at its outer, top layer spaced radial the endless metal net is set on anchor rod body, prevent the corrosion of reinforced anchor bolt.In addition, can also carry out preservative treatment by adopting sleeve pipe or some acroleic acid resins, pitch, modified epoxy asphalt paint or rust protection paint etc.Zhu Yijun etc. have invented the etch-proof anchor pole of a kind of anti-spillage, and (patent publication No.: CN102720196A), the mode by at anchor pole parcel bagging improves grouting quality and antiseptic power.
Suppress the development of corrosion on the certain depth of these ways and meanses, still, for the changeable project situation of actual complex, still be difficult to the unified generation of corroding of preventing effectively.Thereby, except adopting general anti-corrosion measure, utilize the means that detect or monitor, understand the extent of corrosion of anchor pole at any time, judge the permanance situation of anchor pole, be significant for whole engineering.But at present, the research of this respect is also fewer.
Summary of the invention
The purpose of this invention is to provide a kind of effective optical fiber anchor pole corrosion monitoring sensor.This corrosion sensor is used the technology of the strain monitoring of Fibre Optical Sensor, the Quantitative Monitoring that realization is carried out corrosion to the position of the easy generation corrosion of reinforcing bar class and steel strand wires class anchor pole.This sensor has good precision and permanance, can realize long-term stability monitoring, can satisfy requirement of engineering.
Technical scheme of the present invention is as follows:
This anchor pole corrosion sensor structure comprises: optical fiber corrosion expansion monitoring unit, optical fiber grating temperature compensation unit and optical fiber optical grating stress amending unit.The present invention is directed to the corrosion monitoring problem of reinforcing bar class and steel strand wires class anchor pole, for two class anchor poles, sensor arranges basic identical.Hereinafter be that example describes with the reinforced anchor bolt, its narration can be equally applicable to steel strand wires class anchor pole.
Optical fiber corrosion expansion monitoring unit by porous medium bed course (as sand-cement slurry or breathable adhesive tape etc.), bare fibre winding layer, cover cement mortar protective course outward and armouring signal light transmission cable is formed.At first, iron rust is extruded easily when preventing that optical fiber from directly twining, and simultaneously also in order to increase the winding radius of optical fiber, reduces light loss, at anchor pole corrosion monitoring place parcel one deck porous medium bed course.Then, with bare fibre closely a circle circle be wrapped in this mat surface, form the optical fiber winding layer.In order to guarantee that winding around and periphery combine closely, need in winding process, apply an amount of pre-tension stress to optical fiber.And then, wrap up one deck cement sand bed again outside the optical fiber winding layer, as the encapsulation of sensor, protection optical fiber is not damaged by external environment condition.Bare fibre is connected with one section armouring optical cable, the latter with fiber-optic monitoring to the transferring out of strain signal safety.
Hoop and the radial strain of the xsect of anchor pole can be monitored in optical fiber corrosion expansion monitoring unit, this strain is expanded mainly due to the corrosion of anchor pole and is caused, temperature compensation unit and strain amending unit, the strain signal of fiber-optic monitoring be subjected to the influence of the radial strain that axial tension produces but also being subjected to simultaneously the change of environment temperature and anchor pole, so need be set in addition.
An optical fiber grating temperature compensation unit is set near the optical fiber of optical fiber corrosion expansion monitoring unit.Adopt a fiber-optical grating temperature sensor, make one end freedom, measure the internal temperature at corrosion monitoring place, be used for the monitor signal of optical fiber is above carried out temperature compensation, revising environment temperature influences the strain monitoring result, make corrosion expansion strain monitoring simultaneously accurate more, realize the measurement of anchor pole internal temperature.
In anchor pole corrosion monitoring section an optical fiber optical grating stress amending unit is set.Stick a fiber Bragg grating strain sensor at the anchor pole rebar surface along the rock-bolt length direction, measure the longitudinal strain on anchor pole surface in the course of the work.By this longitudinal strain, can obtain pulling force in the anchor pole, convert by Poisson ratio then, can obtain the anchor pole longitudinal force to the influence of its cross-section radial strain.The influence of this longitudinal force of deduction has namely realized the correction of stress from the strain monitoring signal of the optical fiber of corrosion expansion monitoring unit, makes the corrosion expansion strain that monitors more accurate.
In actual the use, before anchor pole inserts the brill mouth, optical fiber corrosion expansion monitoring unit, optical fiber grating temperature compensation unit and optical fiber optical grating stress amending unit are laid in the corrosion monitoring place of anchor pole.Utilize optical fiber Brillouin signal analysis equipment or optical fiber white light interference signal analysis equipment, the optical fiber of corrosion expansion monitoring is carried out signals collecting.Utilize the fiber grating collecting device, the fiber grating of temperature compensation unit and stress modifier is carried out signals collecting.Under extraneous environmental activity, reinforcing bar or steel strand wires anchor pole generation corrosion, the volume of the steel material that the volume of the corrosion product that its surface produces can be obviously consumes greater than corrosion, thereby make corrosion section anchor pole section radius increase, the hoop strain that produces can pass to the optical fiber of winding layer by bed course, makes it produce stretching strain.This stretching strain utilizes optical fiber measurement, and carries out temperature compensation and stress modifier by the fiber grating that arranges.The strain that obtains is namely reflecting the corrosion situation of monitoring section anchor pole, and corrosion is more severe, and the stretching strain of generation is more big.So, namely realized the overall process monitoring of anchor pole corrosion.
The invention has the beneficial effects as follows that the corrosion monitoring principle is clear, the measuring accuracy height; The sensor design novelty, with low cost; And the permanance height, can realize long-term stability monitoring; Sensor is laid convenient, is easy to realize suitability for industrialized production; For many anchor poles in a side slope or the tunnel, sensor can be formed sensing network very easily, utilizes a signal processing and analysis equipment, realizes the corrosion monitoring of the multiple spot of many anchor poles or an anchor pole.
Description of drawings
Among the figure: 1 country rock or side slope; 2 anchor pole reinforcing bar or steel strand wires; 3 anchor pole corrosion sensors;
4 anchor heads; 5 porous medium bed courses; 6 bare fibre winding layers; The 7 outer cement mortar protective courses that cover
8 temperature compensation optical fiber gratings; 9 stress modifier fiber gratings; 10 armouring signal light transmission cables.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The structure of optical fiber anchor pole corrosion sensor comprises: optical fiber corrosion expansion monitoring unit, optical fiber grating temperature compensation unit and optical fiber optical grating stress amending unit.Wherein, optical fiber corrosion expansion monitoring unit is the Sensor core member, by porous medium bed course, bare fibre winding layer, cover cement mortar protective course outward and armouring signal light transmission cable is formed.
Because corrosion easily takes place in the root of anchor pole, as Fig. 1, sensor is laid in the anchor pole root.At first, using Mold Making thickness is 20～30mm, and length is the cylindrical cement mortar bedding cushion of 50mm.Can choose sensor installation position and cushion thickness and length according to actual conditions during concrete the application.Bury the steel pipe for the protection of temperature compensation optical fiber grating in the bed course position in advance underground, and in bed course manufacturing process, imbed the fiber grating for temperature compensation.One end freedom, an end optical fiber is drawn, as shown in Figures 2 and 3.Then, after bed course has been made that its surface finish is smooth, begin to twine light transmitting fiber and form the bare fibre winding layer.When twining optical fiber, guarantee the tight contact between each small coil.Simultaneously, guarantee that fiber optic coils inside has certain pre-tension stress, pre-stretch-draw level is advisable with 1000～2000 μ ε.Treat that the optical fiber winding finishes, and will twine the optical fiber two ends and be fixed on the bed course periphery.Draw at the optical fiber two ends, and put armouring cable protection cover, is used for data transmission is gone out.At last, outside the optical fiber winding layer, build the cement mortar protective course that a layer thickness is 2～5mm again, finish the encapsulation to sensor, as shown in Figure 2.In addition, a fiber-optic grating sensor is pasted near the anchor pole surface optical fiber winding place, monitors its surperficial stress, is used for the influence of meridional stress is revised, as shown in Figure 2.
Claims (5)
1. an optical fiber anchor pole corrosion sensor at reinforcing bar class anchor pole or steel strand wires class anchor pole, is characterized in that, this anchor pole corrosion sensor comprises corrosion expansion monitoring unit, temperature compensation unit and stress modifier unit;
Corrosion expansion monitoring unit comprises porous medium bed course, optical fiber winding layer, cement mortar protective course and armouring signal light transmission cable; The porous medium bed course is wrapped in the anchor pole surface, and an optical fiber closely circle encloses the surface that is wrapped in the porous medium bed course, forms the optical fiber winding layer; The optical fiber winding layer is outward cement sand bed, as the encapsulation of sensor; Optical fiber is connected with armouring signal light transmission cable, the latter with fiber-optic monitoring to the transferring out of strain signal safety;
Near the optical fiber of anchor pole corrosion monitoring unit temperature compensation unit is set, one end freedom, one end optical fiber is drawn, be used for the monitor signal of optical fiber is above carried out temperature compensation, revising environment temperature influences the strain monitoring result, make corrosion expansion strain monitoring simultaneously accurate more, realize the measurement of anchor pole internal temperature;
Anchor pole corrosion monitoring cell surface pastes the stress modifier unit along the rock-bolt length direction, measures the strain on anchor pole surface in the course of the work.
2. a kind of optical fiber anchor pole corrosion sensor according to claim 1 is characterized in that, described porous medium bed course adopts sand-cement slurry or breathable adhesive tape to form.
3. a kind of optical fiber anchor pole corrosion sensor according to claim 1 and 2 is characterized in that, when optical fiber twines, guarantees that the pre-tension stress of fiber optic coils inside is 1000～2000 μ ε.
4. a kind of optical fiber anchor pole corrosion sensor according to claim 1 and 2 is characterized in that described cement mortar protective course thickness is 2～5mm.
5. a kind of optical fiber anchor pole corrosion sensor according to claim 3 is characterized in that described cement mortar protective course thickness is 2～5mm.
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| CN2013102048015A CN103323385A (en) | 2013-05-28 | 2013-05-28 | Fiber anchor pole corrosion sensor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837273A (en) * | 2014-02-27 | 2014-06-04 | 中国电子科技集团公司第八研究所 | Stress monitoring device and manufacturing method |
| CN104535234A (en) * | 2014-12-29 | 2015-04-22 | 大连理工大学 | Optical fiber inhaul cable prestress monitoring method and sensor thereof |
| CN105971647A (en) * | 2016-07-15 | 2016-09-28 | 东南大学 | Multifunctional fiber reinforced plastic (FRP) intelligent anchor rod having single-point temperature compensation function and manufacturing method thereof |
| CN105973285A (en) * | 2016-07-15 | 2016-09-28 | 东南大学 | Multifunctional intelligent anchor pole and installation arrangement method thereof |
| CN106556482A (en) * | 2016-11-16 | 2017-04-05 | 中南大学 | One kind is hung up face and can uphold anchor stress automonitor and its using method |
| CN106640907A (en) * | 2016-11-16 | 2017-05-10 | 广西大学 | Intelligent nut capable of distributed measurement and manufacturing method thereof |
| CN108007619A (en) * | 2017-12-06 | 2018-05-08 | 太原理工大学 | A kind of method using fiber grating measurement anchor pole lateral force |
| CN110285900A (en) * | 2019-06-24 | 2019-09-27 | 太原理工大学 | A kind of force measuring method of FBG force-measuring anchor stock |
| CN110940284A (en) * | 2019-11-13 | 2020-03-31 | 武汉地震工程研究院有限公司 | Manufacturing method of embedded fiber bragg grating reinforcement corrosion sensor |
| CN112031845A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Coal rock interface stability measuring device of fiber grating composite construction |
| CN112490831A (en) * | 2020-11-20 | 2021-03-12 | 北方激光研究院有限公司 | Optical fiber stress long-term maintaining device |
| CN113932841A (en) * | 2021-10-09 | 2022-01-14 | 深圳大学 | Embedded sensor protection device and manufacturing method |
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| CN202166600U (en) * | 2011-05-10 | 2012-03-14 | 大连理工大学 | Fiber grating reinforced concrete corrosion sensor with temperature compensation |
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| US6144026A (en) * | 1997-10-17 | 2000-11-07 | Blue Road Research | Fiber optic grating corrosion and chemical sensor |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837273A (en) * | 2014-02-27 | 2014-06-04 | 中国电子科技集团公司第八研究所 | Stress monitoring device and manufacturing method |
| CN104535234A (en) * | 2014-12-29 | 2015-04-22 | 大连理工大学 | Optical fiber inhaul cable prestress monitoring method and sensor thereof |
| CN105971647B (en) * | 2016-07-15 | 2018-03-09 | 东南大学 | A kind of multi-functional FRP intelligent anchor rods of single-point temperature compensation and preparation method thereof |
| CN105973285A (en) * | 2016-07-15 | 2016-09-28 | 东南大学 | Multifunctional intelligent anchor pole and installation arrangement method thereof |
| CN105971647A (en) * | 2016-07-15 | 2016-09-28 | 东南大学 | Multifunctional fiber reinforced plastic (FRP) intelligent anchor rod having single-point temperature compensation function and manufacturing method thereof |
| CN106556482A (en) * | 2016-11-16 | 2017-04-05 | 中南大学 | One kind is hung up face and can uphold anchor stress automonitor and its using method |
| CN106640907A (en) * | 2016-11-16 | 2017-05-10 | 广西大学 | Intelligent nut capable of distributed measurement and manufacturing method thereof |
| CN108007619A (en) * | 2017-12-06 | 2018-05-08 | 太原理工大学 | A kind of method using fiber grating measurement anchor pole lateral force |
| CN110285900A (en) * | 2019-06-24 | 2019-09-27 | 太原理工大学 | A kind of force measuring method of FBG force-measuring anchor stock |
| CN110940284A (en) * | 2019-11-13 | 2020-03-31 | 武汉地震工程研究院有限公司 | Manufacturing method of embedded fiber bragg grating reinforcement corrosion sensor |
| CN110940284B (en) * | 2019-11-13 | 2021-08-03 | 武汉地震工程研究院有限公司 | Manufacturing method of embedded fiber bragg grating reinforcement corrosion sensor |
| CN112031845A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Coal rock interface stability measuring device of fiber grating composite construction |
| CN112490831A (en) * | 2020-11-20 | 2021-03-12 | 北方激光研究院有限公司 | Optical fiber stress long-term maintaining device |
| CN113932841A (en) * | 2021-10-09 | 2022-01-14 | 深圳大学 | Embedded sensor protection device and manufacturing method |
| CN113932841B (en) * | 2021-10-09 | 2022-09-06 | 深圳大学 | Embedded sensor protection device and manufacturing method |
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Application publication date: 20130925 |