CN107830898A - A kind of corrosion environment monitoring device and its monitoring method based on Fibre Optical Sensor - Google Patents
A kind of corrosion environment monitoring device and its monitoring method based on Fibre Optical Sensor Download PDFInfo
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Abstract
The invention discloses a kind of corrosion environment monitoring device and monitoring method, wherein monitoring device includes a monitoring reinforcing bar, means for supporting reinforcement steel bar, sensor, (FBG) demodulator and Monitoring Data processor；The means for supporting reinforcement steel bar includes two baffle plates, the support column between two baffle plates and the anchorage on the outside of two baffle plates, and the monitoring reinforcing bar is fixed through described two baffle plates and by anchorage and baffle plate；The sensor includes FBG temperature sensors and FBG strain gauges, and wherein FBG temperature sensors are arranged on the support column as temperature compensation sensor, the FBG temperature sensors and FBG strain gauges；It is connected after FBG temperature sensors and FBG the strain gauges series connection by the (FBG) demodulator with the monitoring device processor.The present invention can realize accurate, high accuracy, the corrosion degree of in-situ monitoring presstressed reinforcing steel, predict the development of corrosion in the case where not disturbing corrosion to produce development.Small using the directional error, precision is high, and is capable of the situation of long term monitoring corrosion environment.
Description
Technical field
The present invention relates to a kind of corrosion environment monitoring device, specially a kind of corrosion environmental monitoring dress based on Fibre Optical Sensor
Put and its monitoring method, belong to civil engineering works structure health monitoring field.
Background technology
Steel, as very extensive construction material is used now, various steel constructions, oil and gas pipeline are not used only in
And among level bridges, also with the bridge together with concrete in the form of this composite of armored concrete worldwide
Highway, high buildings and large mansions, fortification etc. be industrial, civilian and military etc. extensive use.In general, steel have intensity
The series of advantages such as high, plasticity good toughness, during one's term of military service performance and stable mechanical property, but also there are some urgently to solve simultaneously
Certainly the problem of, it is exactly its poor corrosion resistance wherein causing the most of concern, it is easily affected by environment to be corroded,
Largely effect on its performance.Especially by the sea under the severe environments such as wet environment, corrosion development speed is very fast；Or in steel
In the case of tendon concrete structure etc. is hidden, steel bar corrosion is not easy to be noticeable, and has been difficult often to retrieve when being found, has had a strong impact on
The durability and safety of engineering structure, it is that experts and scholars go all out to study, makes every effort to the Important Problems solved.
Steel bar corrosion is on the one hand because steel bar corrosion can reduce the effective of reinforcing bar why by so extensive concern
Sectional area, its intensity is reduced, harm is produced to structure, especially among armored concrete, the guild of persistently entering of corrosion causes
The rust of reinforcing bar is swollen, and its corrosion partial volume can be expanded to 2~4 times of original volume, produces splitting stresses, at the same can also destroy reinforcing bar and
Friction between concrete bonds effect, under the joint effect of these factors, will cause the spalling of concrete cover even
Entirety comes off, and ultimately results in concrete structure failure damage；On the other hand, iron rust caused by corrosion can accelerate unrusted steel again
The corrosion process of muscle, the security performance and service life of structure are severely impacted, if not monitoring the hair of corrosion situation at any time
Exhibition, finds and removes corrosion product, structure is missed the optimal maintenance phase in time, and repairing difficulty and rehabilitation expense can be multiplied,
Even fail potential safety hazard caused by discovery in time, so as to trigger collapsing for works, cause serious economic loss and people
Member's injures and deaths.Therefore, in order to effectively solve problems, develop effective monitoring steel bar corrosion technology, reinforcing bar is grasped for correct
The present situation of corrosion, the follow-up developments of steel bar corrosion are estimated, the endurance life of evaluation structure thing, carry out the decision-making of maintenance and reinforcement, protected
Barrier the people's lives and property all has very great meaning safely, is of great immediate significance and economic results in society.
At present, it is mainly main using the scheme inspected periodically, the inspection method of use both at home and abroad for steel bar corrosion
Have：1. cell potential method：By measuring the change of reinforcing bar corrosion potential before and after corrosion, the corrosion state of reinforcing bar is thus judged.
This method can only judge the corrosion basic condition of reinforcing bar, find out the corrosion position of reinforcing bar, can not judge the corrosion rate of reinforcing bar, together
When the factor that is affected it is more, such as polarization, humidity and temperature etc., it is impossible to reflection steel bar corrosion situation completely.2. linear pole
Change method：Based on Stern-Geary formula, when the reinforcing bar in outer bound pair concrete applies a small voltage, reinforcing bar equilibrium potential
It will shift, overpotential caused by polarization is linear in micro- polarized area with polarization current.This method is affected by environment
Larger, the scope of application is smaller, and when environmental condition changes, there may be gross error for testing result.3. electrochemistry noise (ECN) is surveyed
Examination technology is one of important means of corrosion research, is commonly used to industry spot corrosion monitoring.ECN devices are typically by pre-buried
Three electrodes form, and size, the material of two of which working electrode are identical with surface state.Along with corrosion process, two
Current potential, the electric current of electrode produce fluctuation, and this fluctuation is referred to as electrochemistry noise.Electrochemistry noise test equipment is simple, and cost is low,
Corrosion sites (region), such as the measurement of spot corrosion can be measured.But the data of its measurement are unstable, cause the inaccurate of resistance
Really, and data and spectrogram intractability are big.How reasonable dismissal analyzes the data obtained, and description data characteristics is also that ECN is surveyed
The difficult point of examination.In addition, the detection method such as also other resistance probes, coulostatic method.These methods are difficult to extent of steel corrosion
Real-time control is carried out, its corrosion development degree can not be estimated and judged well, it is larger by external interference, waste people
Power material resources, good application can not be actually obtained in engineering.
Also some scholars studied some methods for carrying out corrosion monitoring using fiber grating, its thinking passes through mostly
Splitting stresses caused by Corrosion Monitoring of Rebar are only fitted so as to judge extent of steel corrosion, but because optical fiber is easier to be destroyed
For early monitoring, the later stage is easily because each side reason such as environmental factor, splitting stresses fractures, and because optical fiber covers bar list
Face, the tarnishing processes of reinforcing bar can be had an impact, it is difficult to be advantageously applied to engineering practice.Steel bar corrosion Field Monitoring Technique is still
It is the emphasis of Rust of Rebar in Concrete research.
The content of the invention
For problems of the prior art, the present invention provides a kind of corrosion environment monitoring device based on Fibre Optical Sensor
And its monitoring method, the monitoring device do not contact directly with the reinforcing bar of required monitoring, by reinforcing bar position corrosion environment
The monitoring of situation, so as to obtain the corrosion situation of reinforcing bar, can in the case where not disturbing corrosion to produce development, realize it is accurate,
The corrosion degree of high accuracy and in-situ monitoring reinforcing bar, predict corrosion situation and its development.Small using the directional error, precision is high,
And being capable of in-situ monitoring extent of steel corrosion and its change for a long time.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of corrosion environment monitoring device, it is characterised in that：Including-monitor reinforcing bar, means for supporting reinforcement steel bar, sensor, demodulation
Instrument and Monitoring Data processor；The means for supporting reinforcement steel bar includes two baffle plates, the support column between two baffle plates and position
Anchorage on the outside of two baffle plates, the monitoring reinforcing bar are fixed through described two baffle plates and by anchorage and baffle plate；The biography
Sensor includes FBG temperature sensors and FBG strain gauges, and the FBG temperature sensors and FBG strain gauges are arranged on institute
State on support column；Pass through the (FBG) demodulator and the monitoring device after FBG temperature sensors and FBG the strain gauges series connection
Processor connects, and the (FBG) demodulator is used for the wavelength variable quantity for obtaining the FBG temperature sensors and FBG strain gauges, institute
The wavelength variable quantity that monitoring device processor obtains according to the (FBG) demodulator is stated to obtain being used to judge the corrosion environment corrosion situation
Monitoring bar cross section product.
The monitoring bar cross section product s that the monitoring device processor obtainstFor：
In formula, λfFor FBG strain gauge original wavelength；λftIt is FBG strain gauges in the t times measured data；λp
For FBG temperature sensor original wavelength；λptFor FBG temperature sensors data measured in the t times；R is the radius of support column；
E is the modulus of elasticity of support column, and n is the quantity of support column；μ is strain parameter；σtPass through the prestressing force of t times for presstressed reinforcing steel
Stress after loss.
The baffle plate lower end is provided with the leg for adjusting height, locknut is provided with the leg.
A kind of corrosion method of environmental monitoring using above-mentioned monitoring device, step are：
Step 1: the installation of monitoring device is fixed, specifically include：
Monitoring reinforcing bar is passed through into two baffle plates, monitoring reinforcing bar interlude is in means for supporting reinforcement steel bar, monitoring reinforcing bar is entered
Row tensioning simultaneously will monitor Bar Anchorage on baffle plate on the outside of baffle plate；
FBG strain gauges and FBG temperature sensors are connected with optical fiber, and are installed on support column surface, wherein, FBG
Strain gauge wavelength is λf, FBG temperature sensors wavelength is λp；
Monitoring device is positioned in concrete blinding to be poured near tension embedded bar, keeps monitoring reinforcing bar level simultaneously
Regulation monitoring reinforcing bar is highly to identical with embedded bar rear fixed；
FBG strain gauges and FBG temperature sensors are connected to (FBG) demodulator with optical fiber；
Step 2: embedded bar and monitoring reinforcing bar integrally and are conserved by concreting；
Step 3: corrosion monitoring, is specifically included：
According to the FBG strain gauges and the data λ of FBG temperature sensors measured at different momentsftAnd λpt, it is each right to calculate
Size delta ε is strained when answering time point ttWith institute stress size power Ft：
Ft=n Δs εtEπr2
Wherein, μ is strain parameter, and n is support column quantity；E is support column modulus of elasticity；R is support column radius.
Then F is passed throughtCalculate each time point t monitoring area of reinforcement st:
Wherein, σtFor stress of the presstressed reinforcing steel after the loss of prestress of t times.
Accumulated by more different monitoring time point bar cross sections, judge the inside concrete environment corrosion situation.
Accumulated by more each adjacent time point bar cross section, judge the inside concrete environment corrosion situation and corrosion speed
Degree.
The present invention operation principle be：The presstressed reinforcing steel for being used to monitor in device produces corrosion under corrosion environmental activity,
In tarnishing processes, the effective cross section product of reinforcing bar reduces, and causes the integral rigidity of presstressed reinforcing steel to reduce, and prestressing force size is not
Become, so that stress becomes big to the reinforcing bar monitored in the axial direction, strain also becomes greatly therewith, and strain can pass through presstressed reinforcing steel support frame
Left baffle is delivered on support column, and the Bragg grating of FBG strain gauges is to temperature and strain sensitive, in temperature and stress
Under collective effect, grating produces deformation, its center reflection wavelength is changed (generation wave length shift).In tubing internal reservation
The optical fiber of sufficient length, the reserved optical fiber of FBG temperature sensors can balance out strain variation, make Bragg grating only by temperature
Influence to produce wave length shift.By monitoring the wavelength shift of the two reflection peaks, according to the temperature of two sensors and strain
The sensitivity coefficient of response, two linear equation in two unknowns are established, temperature and the strain at the moment is calculated, is supervised with initial time
On the basis of the strain result measured, compare the data at each time point in later stage, obtain the change speed feelings of each period strain
Condition, that is, reach and monitor corrosion environment by monitoring presstressed reinforcing steel, grasp corrosion situation, quantify the purpose of corrosion rate.
In the present invention, the specific installation process of device is：First, it is monitoring is left through presstressed reinforcing steel support frame with reinforcing bar
The hole of right shell body, reinforcing bar interlude is in steelframe, to reinforcing bar carry out tensioning and on the outside of baffle plate by Bar Anchorage in gear
On plate, FBG strain gauges and FBG temperature sensors are connected with optical fiber, and are installed on upper plate surface；Then, except pre-
Outside stress rib, the other parts of device, which apply, is covered with inorganic polymer elastic coating, and device is positioned over into concrete blinding to be poured
Near interior tension reinforcement, the internal thread hole that 4 threaded legs are reserved from support column is screwed into presstressed reinforcing steel support frame, pays attention to
Keep presstressed reinforcing steel horizontal and adjust height to monitoring reinforcing bar and tension reinforcement in sustained height, then by nut from leg root
Being screwed into prevents leg screw thread stripped thread；Finally, before casting concrete, with optical fiber by FBG strain gauges and FBG temperature sensors
(FBG) demodulator is connected to, carries out concreting and maintenance.
In the present invention, the effect of presstressed reinforcing steel is to perceive and reflect the situation of inside concrete corrosion environment；FBG stress
The effect of sensor is to monitor the strain of steel strip and the change of temperature；The effect of FBG temperature sensors is to eliminate temperature change
Caused monitoring error, improve monitoring accuracy；In presstressed reinforcing steel support frame, the effect of left and right baffle is to transmit presstressed reinforcing steel
For stress to upper plate, and for installing threaded leg, the effect of support column is to paste FBG strain gauges and FBG temperature biography
Sensor, while also have and bear the prestressed effect of presstressed reinforcing steel；The effect of threaded leg is adjustment monitoring presstressed reinforcing steel
Highly, it is at suitable monitoring height；The effect of locknut is prevent leg screw thread and presstressed reinforcing steel support frame interior
Screw thread stripped thread causes device to tilt or damage；The effect of inorganic polymer elastic coating is protection sensor in concreting
It is damaged in journey, while makes not direct contacted with concrete of each part of presstressed reinforcing steel support frame make its free strain unrestricted
System, improve monitoring accuracy；The effect of optical fiber is to be used to transmit data；The effect of (FBG) demodulator and computer is demodulated signal and data point
Analysis.
Compared with prior art, monitoring device of the invention has following advantageous effects：
1st, do not contacted with the reinforcing bar in structure, do not influence the organic growth process of steel bar corrosion, while the rust of steel bar corrosion
Swollen effect, also without influence, greatly reduces systematic error to monitoring result.
2nd, the fiber grating advantage such as have good corrosion resistance, sensitivity higher, can realize the high-precision of presstressed reinforcing steel corrosion
Degree, long term monitoring.
3rd, cost is relatively low, and material therefor is relatively cheap, convenient to be applied in practice in engineering on a large scale, reduces corrosion monitoring
Cost.
4th, it can completely monitor and have an impact all stage to the corrosion later stage to mechanism since corrosion, corrosion ratio development
The key factor such as degree, the speed of development, so as to carry out Durability, remaining life prediction to structure and add for it
Gu maintenance provides reliable basis.Solves the corrosion ratio that other sensors can only monitor corrosion early stage, it is difficult in engineering in practice
The problem of playing application.
Brief description of the drawings
Fig. 1 is a kind of structural representation based on the support pole device of Fibre Optical Sensor corrosion environmental monitoring 4 of the present invention；
Fig. 2 is a kind of structural representation based on the support pole device of Fibre Optical Sensor corrosion environmental monitoring 2 of the present invention；
Fig. 3 is that FBG strain gauges and FBG temperature sensors are bowed to profile in monitoring device of the present invention；
Fig. 4 is vertical cross section figure when apparatus of the present invention work in concrete；
Reference：1：Monitor reinforcing bar；2：FBG strain gauges；3：FBG temperature sensors；4：Presstressed reinforcing steel support frame；
5：Anchorage；6：Threaded leg；7：Locknut；8：Inorganic polymer elastic coating；9：Transmission Fibers；10：(FBG) demodulator and electricity
Brain；11:Concrete；12：Reinforcing bar in structure；201：Adhesive；202：Strain grating；301：Metal tube；302：Rubber；303：
Temperature grating；401：Right baffle-plate；402：Right shell body；403：Support column.
Embodiment
Explanation is further explained to patent of the present invention below in conjunction with the accompanying drawings.
The present invention be based on Fibre Optical Sensor corrosion environment monitoring device, as shown in figure 1, the monitoring device include monitor reinforcing bar 1,
FBG strain gauges 2, FBG temperature sensors 3, presstressed reinforcing steel support frame 4, anchorage 5, threaded leg 6, locknut 7, nothing
Machine high polymer elastic coating 8 and Transmission Fibers 9.Reinforcing bar 1 is monitored with the tensioning of anchorage 5 and is anchored at presstressed reinforcing steel support frame 4
On, presstressed reinforcing steel support frame lower end connects threaded leg 6, and the height of reinforcing bar is monitored using the threaded adjusting on leg, is used in combination
The fixing leg of locknut 7.In addition to reinforcing bar 2 is monitored, the other parts of device, which uniformly apply, spreads inorganic polymer elastic coating.With
Optical fiber 9 connects FBG strain gauges 2 and FBG temperature sensors 3, on the support column 403 of presstressed reinforcing steel support frame,
And it is connected to (FBG) demodulator and computer 10.
Presstressed reinforcing steel support frame 4 is made up of support column 403, right baffle-plate 401 and right shell body 402.Wherein support column connects
Connect left baffle.Left and right baffle can be cuboid stainless steel plate, and there are perforated holes middle, and bottom sets tapped pass through
The hole worn.
Material selected by the pre-loaded support struts frame is the material of stainless steel, steel or other high-strength lights.
Pore quantity is 4 on presstressed reinforcing steel support frame, is distributed on the angle of left baffle bottom four.
Hole screw thread uses single-wire helix on presstressed reinforcing steel support frame, and big footpath exists in 3-5mm, path in 1-3mm, pitch
0.5—0.7mm。
Support column quantity on presstressed reinforcing steel support frame is 2, is respectively arranged in left baffle in upper and lower both sides
Between position, referring to Fig. 2.Support column 403 is away from 10-20mm of upper and lower two back gauge.Or support column quantity is four, left and right is arranged in
The position at four angles of baffle plate, respectively away from 10-20mm of close two back gauge.
Support column radius on presstressed reinforcing steel support frame is 15-20mm.
Support column length on presstressed reinforcing steel support frame is 300mm -400mm.
The left and right baffle thickness of presstressed reinforcing steel support frame is in 5-20mm, more preferably 10-15mm.
The left and right baffle length of presstressed reinforcing steel support frame is in 100-250mm, and width is in 100-250mm, more preferably
It is rectangle, the length of side is in 150-200mm to be.
Hole diameter is in 20-30mm among the left and right baffle of presstressed reinforcing steel support frame.
Monitoring reinforcing bar is the reinforcing bar for monitoring inside concrete corrosion environment specially set, and monitoring reinforcing bar is passed across
The hole of presstressed reinforcing steel support frame left and right baffle, tensioning is carried out to monitoring reinforcing bar on the outside of baffle plate using anchorage, then by anchorage
It is fixed on the outside of baffle plate.
Bar diameter is monitored in 15-30mm.
The length of reinforcing bar is monitored in 400mm -500mm.
FBG strain gauges are a kind of wavelength modularity sensor, are to utilize a part for optical fiber communication to mix germanium light
The ultraviolet exposure method of fine Nonlinear optical absorption and be made, be packaged using adhesive.
FBG temperature sensors are a kind of by the FBG strain gauges that very handle, using tube-packaged, inside metal tube
Without filling, the optical fiber of sufficient length is reserved in pipe, and left and right ends in pipe are sealed and optical fiber is fixed.
Two gratings of FBG strain gauges and FBG temperature sensors select different pitch.
Threaded leg, on leg 3/4 part be with externally threaded cylinder, can out of presstressed reinforcing steel support frame support column spiral shell
Pit is screwed at hole, is fixed on presstressed reinforcing steel support frame, and lower 1/4 part is cone.
Monitoring device includes 4 regulation legs.
Threaded support foot hight is in 20mm -40mm.
Threaded leg top half screw thread uses single-wire helix, and big footpath exists in 3-5mm, path in 1-3mm, pitch
0.5-0.7mm, its parameter are consistent with support column hole internal thread.
Locknut, it is screwed into from regulation leg the latter half on fixed presstressed reinforcing steel support frame.
The Major Diam of nut is in 3-5mm, and path is in 1-3mm, and pitch is in 0.5-0.7mm, its parameter and support post holes
Hole internal thread is consistent.
Inorganic polymer elastic coating, the other positions for the device being uniformly applied in addition to reinforcing bar is monitored.
Inorganic polymer elastic coating selects alkali silicate or Ludox.
Inorganic polymer elastic coating coating thickness is in 1-5mm, more preferably 2-3mm.Transmission Fibers select armouring light
Cable.
Embodiment 1：
For monitoring Corroded Reinforced Concrete environment.
First, monitoring is passed through to the hole of the left and right baffle of presstressed reinforcing steel support frame 4 (401,402) with reinforcing bar 1, makes reinforcing bar
Interlude is in steelframe, reinforcing bar is carried out tensioning and on the outside of baffle plate by Bar Anchorage on baffle plate, choose wavelength difference compared with
Big suitable FBG strain gauges 2 and FBG temperature sensors 3, wherein, FBG strain gauges wavelength is λf, FBG temperature biography
Sensor wavelength is λp.FBG strain gauges 2 and FBG temperature sensors 3 are connected with optical fiber 9, and utilizes and is installed on support column table
Face；Then, outside except presstressed reinforcing steel, the other parts of device, which apply, is covered with inorganic polymer elastic coating 8, and device is positioned over and treated
In casting concrete template near tension reinforcement, by 4 threaded legs 6 from the left baffle of presstressed reinforcing steel support frame 4 (401,
402) reserved internal thread hole is screwed into presstressed reinforcing steel support frame, as shown in figure 4, paying attention to keeping presstressed reinforcing steel horizontal and adjusting pre-
Stress rib height is extremely identical with tension reinforcement, and being then screwed into locknut 7 from leg root prevents leg screw thread stripped thread；Most
Afterwards, before casting concrete, FBG strain gauges and FBG temperature sensors is connected to (FBG) demodulator with optical fiber, carry out concrete
Pour and conserve.After the completion of maintenance, the data measured by each time point FBG strain gauges and FBG temperature sensors are recorded
λftAnd λpt, calculate the wavelength shift of each sensor：
Δλft=λft-λf (1a)
Or Δ λpt=λpt-λp (1b)
Calculation formula can be obtained according to the principle of FBG strain gauges：
Δλft=μ Δs εt+γΔT (2)
Wherein, Δ λftFor the wavelength shift of t FBG strain gauges, μ is strain parameter, and γ is temperature parameter, μ
Determined with γ by fiber grating material characteristics, be known quantity, Δ εtIt is the optical grating axial strain of t, Δ T is t temperature
Spend variable quantity.
FBG temperature sensors are not affected by force by special package, and its calculation formula is：
Δλpt=γ Δs T (3)
Wherein λftFor the Monitoring Data of FBG strain gauge ts, λptFor the monitoring number of FBG temperature sensor ts
According to.
Formula (1), (2) are substituted into respectively, can be obtained：
Δλft=λft-λf=μ Δs εt+γΔT (4)
Δλpt=λpt-λp=γ Δs T (5)
Δλft-Δλpt=μ Δs εt (6)
Relation between wavelength shift and presstressed reinforcing steel strain can be established.The 1st group monitored when being completed according to record maintenance
Data, the size of the actual forces suffered by presstressed reinforcing steel can be calculated：
Ft=n Δs εtEπr2 (7)
Wherein, FtIt is the size of presstressed reinforcing steel t institute stress, r is the radius of support column, and E is the springform of support column
Amount, n are the quantity of support column.
Afterwards, according to above-mentioned gathered data process and calculating process, Monitoring Data of corresponding period extraction, meter are spaced
Size delta ε is strained when calculating each corresponding time point2、Δε3、Δε4... and then pass through prestressing force size and formula：
σt=σ0-(σl1+σl2+σl3+σl4t+σl5t) (8)
Wherein, σtFor stress of the presstressed reinforcing steel after the loss of prestress of t times；σ0For the tension stress of presstressed reinforcing steel；
σl1For prestress loss value caused by stretching end anchor deformation and presstressed reinforcing steel Inner contractings；σl2For caused by the friction of presstressed reinforcing steel
Prestress loss value；σl3For concrete heating curing when, prestress loss value caused by the temperature difference between anchorage and presstressed reinforcing steel；
σl4tFor prestress loss value caused by t Relaxation of prestressing；σl5tIn advance should for the prestressed contraction of t and caused by creeping
Power penalty values；σl1~σl5tDetailed computational methods reference《Concrete design specification GB 50010-2010》.
Calculate each time point area of reinforcement st, you can each monitoring time point bar cross section product is obtained, by relatively more each
Adjacent time point bar cross section accumulates, and judges the inside concrete environment corrosion situation and rusting rate.
Embodiment 2：
For monitoring the wet environment suffered by works by the sea.
Embodiment 1 is repeated, simply need not nuzzle device in advance inside concrete, be placed on needing the structure monitored
Under natural environment by thing.
Claims (7)
- A kind of 1. corrosion environment monitoring device, it is characterised in that：Including a monitoring reinforcing bar, means for supporting reinforcement steel bar, sensor, (FBG) demodulator And Monitoring Data processor；The means for supporting reinforcement steel bar includes two baffle plates, the support column between two baffle plates and is located at Anchorage on the outside of two baffle plates, the monitoring reinforcing bar are fixed through described two baffle plates and by anchorage and baffle plate；The sensing Device includes FBG temperature sensors and FBG strain gauges, and the FBG temperature sensors and FBG strain gauges are arranged on described On support column；After the FBG temperature sensors and FBG strain gauges series connection by the (FBG) demodulator and the monitoring device at Device connection is managed, the (FBG) demodulator is used for the wavelength variable quantity for obtaining the FBG temperature sensors and FBG strain gauges, described The wavelength variable quantity that monitoring device processor obtains according to the (FBG) demodulator obtains being used to judge the monitored corrosion environment corrosion The monitoring bar cross section product of situation.
- 2. corrosion environment monitoring device according to claim 1, it is characterised in that：The FBG strain gauges are two And on different support columns, the FBG temperature sensors are one and are located in one of where FBG strain gauges Support.
- 3. corrosion environment monitoring device according to claim 2, it is characterised in that：The FBG temperature sensors and FBG should Force snesor all passes grating sensor for optical fiber, and two gratings of the FBG strain gauges and FBG temperature sensors are from different Pitch.
- 4. according to any described corrosion environment monitoring devices of claim 1-3, it is characterised in that：The monitoring device processor Obtained monitoring bar cross section product stFor：<mrow> <msub> <mi>s</mi> <mi>t</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&lambda;</mi> <mrow> <mi>f</mi> <mi>t</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>&lambda;</mi> <mi>f</mi> </msub> <mo>-</mo> <msub> <mi>&lambda;</mi> <mrow> <mi>p</mi> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>&lambda;</mi> <mi>p</mi> </msub> </mrow> <mrow> <msub> <mi>&mu;&sigma;</mi> <mi>t</mi> </msub> </mrow> </mfrac> <msup> <mi>n&pi;r</mi> <mn>2</mn> </msup> <mi>E</mi> </mrow>In formula, λfFor FBG strain gauge original wavelength；λftIt is FBG strain gauges in the t times measured data；λpFor FBG Temperature sensor original wavelength；λptFor FBG temperature sensors data measured in the t times；R is the radius of support column；E is branch The modulus of elasticity of dagger, n are the quantity of support column；μ is strain parameter；σtPass through the loss of prestress of t times for presstressed reinforcing steel Stress afterwards.
- 5. corrosion environment monitoring device according to claim 4, it is characterised in that：It is provided with and is used in the baffle plate lower end The leg of height is adjusted, locknut is provided with the leg.
- 6. a kind of inside concrete steel bar corrosion method of environmental monitoring using any monitoring devices of claim 1-5, its It is characterised by：Step is：Step 1: the installation of monitoring device is fixed；Step 2: embedded bar and monitoring reinforcing bar integrally and are conserved by concreting, the diameter of the monitoring reinforcing bar, Arranged direction and prestressing force size are identical with embedded bar；Step 3: corrosion monitoring, is specifically included：According to the FBG strain gauges and the data λ of FBG temperature sensors measured at different momentsftAnd λpt, calculate each corresponding time Size delta ε is strained during point ttWith the size F of institute stresst：<mrow> <msub> <mi>&Delta;&epsiv;</mi> <mi>t</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&lambda;</mi> <mrow> <mi>f</mi> <mi>t</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>&lambda;</mi> <mi>f</mi> </msub> <mo>-</mo> <msub> <mi>&lambda;</mi> <mrow> <mi>p</mi> <mi>t</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>&lambda;</mi> <mi>p</mi> </msub> </mrow> <mi>&mu;</mi> </mfrac> </mrow>Ft=n Δs εtEπr2Wherein, μ is strain parameter, and n is support column quantity；E is support column modulus of elasticity；R is support column radius.Then prestressing force F is passed throughtCalculate each time point t monitoring area of reinforcement st：<mrow> <msub> <mi>s</mi> <mi>t</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>F</mi> <mi>t</mi> </msub> <msub> <mi>&sigma;</mi> <mi>t</mi> </msub> </mfrac> </mrow>Wherein, σtFor stress of the presstressed reinforcing steel after the loss of prestress of t times.
- 7. inside concrete steel bar corrosion method of environmental monitoring according to claim 6, it is characterised in that：The monitoring dress The installation put is fixed and specifically included：Monitoring reinforcing bar is passed through into two baffle plates, monitoring reinforcing bar interlude is in means for supporting reinforcement steel bar, monitoring reinforcing bar is opened Draw and Bar Anchorage will be monitored on the outside of baffle plate on baffle plate；FBG strain gauges and FBG temperature sensors are connected with optical fiber, and are installed on support column surface, wherein, FBG stress Sensor wavelength is λf, FBG temperature sensors wavelength is λp；Monitoring device is positioned in concrete blinding to be poured near tension embedded bar, keeps monitoring reinforcing bar horizontal and adjusts It is extremely identical with embedded bar rear fixed to monitor reinforcing bar height；FBG strain gauges and FBG temperature sensors are connected to (FBG) demodulator with optical fiber.
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