CN207248706U - A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor - Google Patents
A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor Download PDFInfo
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- CN207248706U CN207248706U CN201720783584.3U CN201720783584U CN207248706U CN 207248706 U CN207248706 U CN 207248706U CN 201720783584 U CN201720783584 U CN 201720783584U CN 207248706 U CN207248706 U CN 207248706U
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Abstract
The utility model discloses a kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor, it is related to anchor cable monitoring technical field.Mainly axial arranged axial profile fiber is equipped with the surface of tested anchor cable, one end of axial profile fiber and one end of fiber grating connect, the other end of fiber grating is connected with distributed (FBG) demodulator, and the other end of the axial direction profile fiber is connected with another interface of distributed (FBG) demodulator.The change that light spectrum is scattered in optical fiber is demodulated by distributed demodulation techniques, realizes the monitoring of anchor cable local corrosion.The utility model can realize the local corrosion monitoring of prestress anchorage cable, high sensitivity, the corrosion condition of energy Accurate Diagnosis anchor cable and corrosion damage position, grasp structural damage degree, predict remaining life；It can also coordinate and realize compound prestress rope erosion damage monitoring.The utility model is simple and reliable, facilitates project installation, highly practical, is suitable for different type, the rope erosion monitoring in different corrosion stages.
Description
Technical field
Prestress anchorage cable monitoring technical field is the utility model is related to, is particularly suitable for prestress anchorage cable corrosion monitoring.
Background technology
Reinforced from prestressed anchorage technology in 1934 on Algerian She Erfa dam concretes dam and defect processing
Since middle successful application, prestressed anchorage technology with its simple process, effect protrude the characteristics of, obtained global scientist and work
Cheng Shi's is widely recognized as.China from plum scenery with hills and waters storehouse multiple-arch dam or so dam abutment reinforcing in first use prestressed anchorage technology since,
Have become the main reinforcing means of the engineerings such as China's hydraulic and hydroelectric engineering high slope, the dam foundation.But prestress anchorage cable is as a kind of
The buried high stress structure in underground, working environment is there is the Korrosionsmedium using water as carrier, in its free segment and interior anchor
Gu section easily produces rope erosion problem.Therefore, with the extensive use of Anchorage Technology, prestressed anchor in engineering practice
Rope corrosion failure is commonplace.
However, since prestress anchorage cable has concealment, residing geological environment is complicated in addition, in its engineering quality evaluating and
Supervision aspect, which all has, to acquire a certain degree of difficulty.There is presently no feasible method to carry out accurate evaluation Environmental variations condition lower prestress
Anchor cable can not be also commented the long durability of prestress anchorage system in side slope, the dam foundation with the corrosive degradation degree of time
Valency.Therefore, develop a kind of prestress anchorage cable long term monitoring methods becomes the weight that engineers and technicians tackle this problem
Want option.
Distributed optical fiber sensing device according to extraneous environmental parameter (as strain, temperature, vibration, refractive index, acceleration and
Voltage etc.) change cause optical fiber optical characteristics change (such as phase of light wave, frequency, polarization state and power) obtain optical fiber along
External environmental information.The Corrosion monitoring of regular reinforcement is using white light interference corrosion sensor, brillouin distributed optical fiber at present
Sensor and Low coherence fibre optic strain sensor, speculate corrosion by the change for testing light intensity and frequency shift signal.Wherein white light is done
Relate to corrosion sensor, brillouin distributed optical fiber sensing device forms light by the way that close fiber optic is wrapped on reinforcing bar or mortar bed
The expansion strain that fine coil measurement reinforcement corrosion produces, realizes the corrosion measurement of reinforcing bar, based on Michelson principle of interferences
Low coherence fibre optic strain sensor, realizes long-term corrosion monitoring of the structural deformation more than 1000 μ ε.But the above method is deposited
In three problems, first, this method is insensitive for slight corrosion, especially local corrosion, second, the increasing with swollen strain of becoming rusty
Add (>1000 μ ε), fiber optic coils are subject to local compression to cause optical fiber micro-bending to aggravate, and cause Brillouin signal signal-to-noise ratio substantially to drop
It is low, rebar corrosion information can not be measured；Third, optical fiber complex method is not suitable for prestress anchorage cable.In addition, the corruption of reinforcing bar
Erosion test method also have based on the swollen principle of becoming rusty pass through it is circumferential lay sensor fibre and test optical fiber Brillouin shift signal intensity reflect
Corrosion.Yet with the limitation of spatial resolution, full distributed sensing technology is difficult to the variation characteristic for reflecting local train, on
Stating research, by increasing brillouin distributed sensor length (formation fiber optic coils), to solve, measuring accuracy is low and corrosion is damaged
Hinder the problem of positioning.But distributed measurement is changed into point measurement by this measure, cause the homogeneous corrosion that can only measure reinforcing bar, no
The real anchor cable local corrosion monitoring of energy, the corrosion condition of Accurate Diagnosis anchor cable, grasps structural damage degree, and prediction is remaining to use the longevity
Life, can not play the advantage of full distributed sensing technology.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of prestress anchorage cable corrosion damage based on Fibre Optical Sensor
Hinder monitoring device, can realize the local corrosion monitoring of prestress anchorage cable, and high sensitivity, the corrosion feelings of energy Accurate Diagnosis anchor cable
Condition, grasps structural damage degree, predicts remaining life.It can also coordinate and realize compound prestress rope erosion damage prison
Survey.It can not only play an important role in the safe for operation etc. of prestressed anchor reinforcement structure, moreover it is possible to which anchor cable structure is broken
The Theoretical Design of bad mechanism and anchor structure provides guidance, has important scientific meaning and engineering practical value.
The main technical schemes of the utility model are：A kind of prestress anchorage cable corrosion damage monitoring dress based on Fibre Optical Sensor
Put, it is characterised in that：Including can with tested anchor cable axial restraint arrange axial profile fiber, fiber grating used for positioning and
For solving the distributed (FBG) demodulator of dim signal, the axial direction profile fiber is one or more；Every axial profile fiber is single
Root axial direction line is in end to end tandem for more than 2 axial lines；It is described axial direction profile fiber one end with it is used for positioning
One end connection of fiber grating, the other end of fiber grating are connected with the distributed (FBG) demodulator for solving dim signal, the axis
It is connected to the other end of profile fiber with another interface of distributed (FBG) demodulator.
Preferably, described to be arranged as with tested anchor cable axial restraint, axial profile fiber can be fixed on the surface of anchor cable,
Or it is fixed on the surface of the center steel strand wires of anchor cable or is built in the steel strand wires of center.
Preferably, the axial profile fiber is single axial line or is that more than 2 axial lines are in end to end tandem.
Preferably, the axial profile fiber is more than 2.
A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor described in any of the above-described, its feature exist
In：Energy stationary distribution is further included in the spiral winded type optical fiber of the outer surface of anchor cable, the spiral winded type optical fiber, axial direction
Profile fiber and fiber grating are in series, its tandem is one of following three：One kind is during spiral winded type optical fiber is located at
Between, other two kinds of constituent elements are distributed in both sides, and one kind is that fiber grating is distributed in both sides positioned at centre, other two kinds of constituent elements, finally
One kind is that axial profile fiber is distributed in its both sides positioned at centre, other two kinds of constituent elements；Be distributed in the constituent elements of both sides respectively with
In the distributed (FBG) demodulator connection of solution dim signal.
Preferably, the spiral winded type optical fiber is single spiral, or is the single spiral tandem of more than 2.
Preferably, the spiral winded type optical fiber is general single mode fiber, and the general single mode fiber is Brillouin
Scattering spectra is unimodal optical fiber, and the fiber grating is Bragg grating.
Apparatus above is to be based on following methods.A kind of prestress anchorage cable corrosion damage monitoring method based on Fibre Optical Sensor,
This method includes：Axial restraint is disposed with axial profile fiber, one end of the axial direction profile fiber and use on tested anchor cable
In one end connection of the fiber grating of positioning, the fiber grating is located on tested anchor cable or outside tested anchor cable, the optical fiber
Relative position between grating one end and tested anchor cable 1 is known quantity, and the other end of fiber grating solves dim signal with being used for
Distributed (FBG) demodulator connection, the other end of the axial direction profile fiber are connected with another interface of distributed (FBG) demodulator；The axis
It is one or more to profile fiber；Every axial profile fiber is single axial line or is that more than 2 axial lines are in end to end
Tandem；When local corrosion occurs for anchor cable, since the sectional area of the anchor cable of corrosion location reduces Stiffness, you can cause this
The strain at position sharply increases, so as to cause the strain of the axial axial profile fiber for being distributed in the position to sharply increase；Temperature
Change with stress can cause scattering light spectral signature in optical fiber to change, and be demodulated by distributed demodulation techniques in optical fiber
Scatter the change of light spectrum, you can the temperature of optical fiber and the change of stress are finally inversed by, so as to fulfill the monitoring of anchor cable local corrosion.
Preferably, the axial profile fiber composite solid schedules the surface of anchor cable, or is fixed on the central steel strand of anchor cable
The surface of line is built in the steel strand wires of center.
Preferably, the axial profile fiber is general single mode fiber, and the general single mode fiber dissipates for Brillouin
It is unimodal optical fiber to penetrate spectrum, and the fiber grating is Bragg grating.
Preferably, the distributed demodulation techniques are the time-domain analysis technology BOTDA based on Brillouin scattering, time domain
Reflection technology BOTDR, optical frequency domain analysis technology BOFDA or the Distributed Optical Fiber Sensing Techniques based on Rayleigh scattering.
Improved, the prestress anchorage cable corrosion damage monitoring method based on Fibre Optical Sensor, has been additionally provided with spiral twine
Wound optical fiber, the spiral winded type fiber spiral stationary distribution is in the outer surface of anchor cable, the axial direction profile fiber, axial direction
Profile fiber and fiber grating are in series, its tandem is one of following three：One kind is during spiral winded type optical fiber is located at
Between, other two kinds of constituent elements are distributed in both sides, and one kind is that fiber grating is distributed in both sides positioned at centre, other two kinds of constituent elements, finally
One kind is that axial profile fiber is distributed in its both sides positioned at centre, other two kinds of constituent elements；Be distributed in the constituent elements of both sides respectively with
In the distributed (FBG) demodulator connection of solution dim signal；The spiral winded type optical fiber is single spiral, or is the list of more than 2
A spiral tandem；When general corrosion expansion occurs for anchor cable, spiral winded type optical fiber tension of the Spiral distribution on anchor cable, its
Strain can increase therewith, so as to realize the monitoring of anchor cable general corrosion expansion at the same time by distributed demodulation techniques.
Preferably, the spiral winded type optical fiber composite solid schedules the surface of anchor cable, or composite solid due to anchor cable week
In the structure enclosed.
Preferably, the spiral winded type optical fiber is general single mode fiber, and the general single mode fiber is Brillouin
Scattering spectra is unimodal optical fiber, and the fiber grating is Bragg grating.
Preferably, the distributed demodulation techniques are the time-domain analysis technology BOTDA based on Brillouin scattering, time domain
Reflection technology BOTDR, optical frequency domain analysis technology BOFDA or the Distributed Optical Fiber Sensing Techniques based on Rayleigh scattering.
The good effect of the utility model is：It can realize the local corrosion monitoring of prestress anchorage cable, and high sensitivity, energy
The corrosion condition of Accurate Diagnosis anchor cable, grasps structural damage degree, predicts remaining life.It can also coordinate and realize that combined type is pre-
Stress rope erosion damage monitoring.It can carry out the damage monitoring of general corrosion expansion.General corrosion expansion include homogeneous corrosion, into
Piece corrodes.The utility model method is simple and reliable, facilitates project installation, highly practical, can not only realize that prestress anchorage cable is equal
Even corrosion monitoring, can also realize that local corrosion monitors.Corrosion monitoring precision cannot be improved, improves the measurement of extent of corrosion
Scope, high sensitivity, the corrosion condition of energy Accurate Diagnosis anchor cable, grasps structural damage degree, predicts remaining life.It is adapted to
In different type, the rope erosion monitoring in different corrosion stages.Measuring accuracy is high, corrosion damage accurate positioning.Not only in advance should
The safe for operation etc. of power anchor cable ruggedized construction can play an important role, moreover it is possible to which the failure mechanism and anchoring of anchor cable structure are tied
The Theoretical Design of structure provides guidance, has important scientific meaning and engineering practical value.
Brief description of the drawings
Fig. 1 is the structure diagram and working state figure of the utility model embodiment.
Fig. 2 is to be pasted with optical fiber ribbon rockbolt stress figure jaggy.
Fig. 3 is the stress test figure with anchor pole jaggy under pulled condition.
Fig. 4 is the swollen test result figure of rust in the case of anchor pole homogeneous corrosion.
Each label implication is in figure：1st, it is tested anchor cable, 2, optical fiber, 2-1, axial profile fiber, 2-2, spiral winded type light
Fibre, 3, fiber grating, 4, distributed (FBG) demodulator, 5, notch.
Embodiment
With reference to the utility model embodiment attached drawing, the technical scheme in the embodiment of the utility model is carried out it is clear,
It is fully described by, it is clear that described embodiment is only the part of the embodiment of the utility model, rather than whole implementation
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be implemented using other different from other manner described here, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore the scope of protection of the utility model is from following public specific embodiment
Limitation.
Embodiment 1：A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor, including can be with quilt
Survey the axial profile fiber 2-1, fiber grating used for positioning 3 and point for solving dim signal of 1 axial restraint of anchor cable arrangement
Cloth (FBG) demodulator 4, the axial direction profile fiber 2-1 is one or more；Every axial profile fiber 2-1 for single axial line or
It is in end to end tandem for more than 2 axial lines；One end of the axial direction profile fiber 2-1 and fiber grating used for positioning
3 one end connection, the other end of fiber grating 3 are connected with the distributed (FBG) demodulator 4 for solving dim signal, the axial direction point
The other end of cloth optical fiber 2-1 is connected with another interface of distributed (FBG) demodulator 4.
Its application is based on following methods：
This method includes：On tested anchor cable 1 or axial arranged on 1 outer surface surrounding structure of tested anchor cable there is axial distribution
Optical fiber 2-1, one end of the axial direction profile fiber 2-1 are connected with one end of fiber grating 3 used for positioning, the fiber grating
3 on tested anchor cable 1 and outside tested anchor cable 1 (any position), described 3 one end of fiber grating and tested anchor cable 1 it
Between relative position be known quantity.The other end of fiber grating 3 is connected with the distributed (FBG) demodulator 4 for solving dim signal, institute
The other end for stating axial profile fiber 2-1 is connected with another interface of distributed (FBG) demodulator 4；The axial direction profile fiber 2-1 is
One or more；Every axial direction profile fiber 2-1 is single axial line or is that more than 2 axial lines are in end to end tandem；Institute
When the fiber grating 3 stated is located at outside anchor cable, fiber lengths are between 1 one end of one end and tested anchor cable of the fiber grating 3
Known quantity；When fiber grating is located on anchor cable, it is known quantity that the fiber grating 3, which is arrived with the relative position of tested anchor cable 1,；
When local corrosion occurs for anchor cable 1, since the sectional area of the anchor cable 1 of corrosion location reduces Stiffness, you can cause the position
Strain sharply increase, so as to cause the strain of the axial axial profile fiber 2-1 for being distributed in the position to sharply increase；Temperature with
The change of stress can cause scattering light spectral signature in optical fiber to change, and demodulated in optical fiber and dissipated by distributed demodulation techniques
Penetrate the change of light spectrum, you can the temperature of optical fiber and the change of stress are finally inversed by, so as to fulfill the monitoring of 1 local corrosion of anchor cable.
The axial profile fiber 2-1 composite solids schedule anchor cable 1 surface, or be fixed on the center steel strand wires of anchor cable 1 surface or
It is built in the steel strand wires of center.
The axial profile fiber 2-1 is general single mode fiber, and the general single mode fiber is Brillouin spectrum
For unimodal optical fiber, the fiber grating 3 is Bragg grating.
The distributed demodulation techniques are time-domain analysis technology BOTDA, time domain reflection technology based on Brillouin scattering
BOTDR, optical frequency domain analysis technology BOFDA or the Distributed Optical Fiber Sensing Techniques based on Rayleigh scattering.
Embodiment 2：On the basis of embodiment 1, further include energy stationary distribution and twined in the spiral of outer surface of anchor cable 1
Wound optical fiber 2-2, the spiral winded type optical fiber 2-2, axial direction profile fiber 2-1 and fiber grating 3 are in series, its concatenation side
Formula is one of following three：One kind is that spiral winded type optical fiber is distributed in both sides positioned at centre, other two kinds of constituent elements, and one kind is light
Fine grating is distributed in both sides positioned at centre, other two kinds of constituent elements, and last one kind is axial profile fiber positioned at centre, other two kinds
Constituent element is distributed in its both sides；The constituent element for being distributed in both sides is connected with the distributed (FBG) demodulator 4 for solving dim signal respectively；It is described
Spiral winded type optical fiber 2-2 is single spiral, or is the single spiral tandem of more than 2.Preferably, it is described spiral to twine
Wound optical fiber 2-2 is general single mode fiber, and the general single mode fiber is that Brillouin spectrum is unimodal optical fiber, described
Fiber grating 3 is Bragg grating.
Its test is based on following methods：
When general corrosion expansion occurs for anchor cable 1, spiral winded type optical fiber 2-2 tension of the Spiral distribution on anchor cable 1, its
Strain can increase therewith, so as to realize the monitoring of 1 general corrosion of anchor cable expansion at the same time by distributed demodulation techniques.
The spiral winded type optical fiber 2-2 composite solids schedule the surface of anchor cable 1, or composite solid is around anchor cable 1
Structure on；The spiral winded type optical fiber 2-2 is single spiral, or is the single spiral tandem of more than 2.It is described
Spiral winded type optical fiber 2-2 be general single mode fiber, the general single mode fiber is that Brillouin spectrum is unimodal light
Fibre, the fiber grating 3 are Bragg grating.The distributed demodulation techniques are the time domain based on Brillouin scattering point
Analysis technology BOTDA, time domain reflection technology BOTDR, optical frequency domain analysis technology BOFDA or the distribution type fiber-optic based on Rayleigh scattering
Sensing technology.
The utility model is addressed further under as follows：The utility model includes the axial surface light for being distributed in 1 surface of anchor cable
Fine 2-1, the spiral spiral winded type optical fiber 2-2 being distributed on anchor cable 1, fiber grating used for positioning 3 and for demodulating
The distributed (FBG) demodulator 4 of optical signal.The axial profile fiber 2-1 and spiral winded type optical fiber 2-2 is by same root optical fiber system
Into, or the two install respectively after linked together by modes such as weldings.The (FBG) demodulator 4 is using distributed demodulation skill
Art, such as the time-domain analysis technology (BOTDA) based on Brillouin scattering, time domain reflection technology (BOTDR), optical frequency domain analysis skill
Art (BOFDA) or the Distributed Optical Fiber Sensing Techniques based on Rayleigh scattering etc., but it is not limited to this.
It is well known that the change of temperature and stress can cause scattering light spectral signature in optical fiber to change, pass through distribution
Formula demodulation techniques demodulate the change that light spectrum is scattered in optical fiber, you can are finally inversed by the temperature and stress variation of optical fiber, are answered when pre-
When the stress of power anchor cable 1 changes, the stress for the axial profile fiber 2-1 being axially distributed on anchor cable 1 can also occur therewith
Change；Similarly, when corrosion expansion occurs for anchor cable 1, spiral winded type optical fiber 2-2 of the Spiral distribution on anchor cable 1 also can be therewith
Produce stretching strain.Herein basis on establish anchor cable 1 corrode and strain between functional relation, strain and optical fiber backscatter signals
Functional relation between the frequency displacement of (such as Brillouin's reflectance spectrum), you can by using the (FBG) demodulator 4 of distributed demodulation techniques
Monitoring optical fiber backscatter signals frequency shift amount monitors the real-time of the corrosion of anchor cable 1 to realize in real time.
Since the reflection spectrum characteristic of fiber grating 3 and the backscattering spectral signature of optical fiber 2 are different, you can pass through distribution
Formula (FBG) demodulator 4 reads out the position relationship between 1 corrosion events of fiber grating 3 and anchor cable, opposite with anchor cable in fiber grating 3
In the case of position is known, you can realization is accurately positioned 1 corrosion events of anchor cable.
When local corrosion occurs for anchor cable 1, since the sectional area of the anchor cable 1 of corrosion location reduces Stiffness, slightly
Corrosion can cause the strain at the position to sharply increase, and cause the strain of the axial axial profile fiber 2-1 for being distributed in the position
Sharply increase, so as to fulfill the monitoring of 1 local corrosion of anchor cable；When general corrosion expansion occurs for anchor cable 1, Spiral distribution is in anchor cable
Spiral winded type optical fiber 2-2 tensions on 1, its strain can also increase therewith, so as to realize that the general corrosion of anchor cable 1 is supervised
Survey.The slight corrosion of anchor cable 1 can cause the strain variation of axial profile fiber 2-1, and expansion caused by heavy corrosion can cause spiral shell
Rotation is distributed in the strain variation of spiral winded type optical fiber 2-2 on anchor cable 1, and therefore, this method can not only improve 1 corrosion monitoring of anchor cable
Precision, moreover it is possible to while solve the problems, such as because the swollen Brillouin signal signal-to-noise ratio that should become larger of becoming rusty significantly reduces, axial profile fiber 2-1
Complement one another with spiral winded type optical fiber 2-2, mutually verification, be adapted to different type, the rope erosion in different corrosion stages respectively
Monitoring.
In order to verify the feasibility of this method, carried out respectively in laboratory with jagged anchor pole (simulation local corrosion)
Radial drawing test and anchor pole corrosion test.
Axial profile fiber 2-1 is axially pasted on 1 steel wire of anchor cable with jagged 5 (as shown in Fig. 2), and by anchor
Bar install with cupping machine, according to the light path shown in Fig. 1 by intelligent acess BOTDA, wherein the total length moon of optical fiber used
For 20m, the length for the axial profile fiber 2-1 being pasted onto on 1 steel wire of anchor cable is about 0.5m, and notch is located at the position of 16.9m, is led to
Overstretching testing machine carries out tension test to anchor pole, and drafting results are as shown in figure 3, the strain of gap position as seen from Figure 3
Significantly greater than other positions, it is possible thereby to which demonstrating this method can realize that prestress anchorage cable local corrosion monitors.
Anchor cable is put into brine and is accelerated using electrochemical process on anchor cable 1 by spiral winded type optical fiber 2-2 Spiral distributions
Corrosion, which is homogeneous corrosion, the rate of corrosion that theoretical calculation goes out and the strain stress relation such as Fig. 4 gone out using BOTDA technical testings
It is shown, it is possible thereby to demonstrate the feasibility of this method measurement prestress anchorage cable homogeneous corrosion.
Above-mentioned steel strand wires generally have 5 and 7 steel strand wires, and one of center is known as center steel strand wires.Generally axially it is distributed
Optical fiber will be arranged in the surface of center steel strand wires or be built in the steel strand wires of center.
Above-mentioned measurement corrosion damage type：Local corrosion.Local corrosion monitoring principle：During generation local corrosion, due to corruption
The sectional area for losing the anchor cable 1 at position reduces Stiffness, you can causes the strain at the position to sharply increase, so as to cause axial point
Strain of the cloth in the surface axial optical fiber 2-1 at the position sharply increases；The change of temperature and stress can cause to scatter light in optical fiber
Spectral signature changes, and the change that light spectrum is scattered in optical fiber is demodulated by distributed demodulation techniques, you can inverting light extraction
The change of fine temperature and stress, so as to fulfill the monitoring of 1 local corrosion of anchor cable.
Above-mentioned measurement corrosion damage type：Homogeneous corrosion or solid corrosion.Monitoring principle：When anchor cable generation general corrosion is swollen
When swollen, spiral winded type optical fiber 2-2 tension of the Spiral distribution on anchor cable 1, its strain can increase therewith, so as to pass through distribution
Demodulation techniques realize the monitoring of the corrosion expansion of anchor cable 1.
The advantage of Spiral distribution optical fiber：
1) compared with fiber optic coils mensuration, the signal-to-noise ratio of fibre scattering light is improved, extends the service life of corrosion monitoring
Cycle.
2) compared with fiber optic coils mensuration, the defects of overcoming point measurement, the full distributed of rope erosion is realized
Measurement.
A shear deformation, replacement on the utility model method and device principle basis etc., all guarantor in the utility model
Within the scope of shield.
Claims (6)
- A kind of 1. prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor, it is characterised in that：Including can be with tested anchor Axial profile fiber (2-1), the fiber grating used for positioning (3) and for solving dim signal of rope (1) axial restraint arrangement Distributed (FBG) demodulator (4), the axial direction profile fiber (2-1) is one or more；Every axial profile fiber (2-1) is single axle It is in end to end tandem to line or for more than 2 axial lines；It is described axial direction profile fiber (2-1) one end with it is used for positioning One end connection of fiber grating (3), the other end of fiber grating (3) connect with the distributed (FBG) demodulator (4) for solving dim signal Connect, the other end of the axial direction profile fiber (2-1) is connected with another interface of distributed (FBG) demodulator (4).
- 2. a kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor according to claim 1, its feature It is：Described to be arranged as with tested anchor cable (1) axial restraint, axial profile fiber (2-1) can be fixed on the table of anchor cable (1) Face, or be fixed on the surface of the center steel strand wires of anchor cable (1) or be built in the steel strand wires of center.
- 3. a kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor according to claim 1, its feature It is：The axial direction profile fiber (2-1) is more than 2.
- A kind of 4. prestress anchorage cable corrosion damage monitoring dress based on Fibre Optical Sensor according to any one of claim 1-3 Put, it is characterised in that：Energy stationary distribution is further included in anchor cable (1), outer surface spiral winded type optical fiber (2-2), institute State spiral winded type optical fiber (2-2), axial profile fiber (2-1) and fiber grating (3) to be in series, its tandem is following three One of kind：One kind is that spiral winded type optical fiber is distributed in both sides positioned at centre, other two kinds of constituent elements, and one kind is that fiber grating is located at Centre, other two kinds of constituent elements are distributed in both sides, and last one kind is that axial profile fiber is distributed in positioned at centre, other two kinds of constituent elements Its both sides；The constituent element for being distributed in both sides is connected with the distributed (FBG) demodulator (4) for solving dim signal respectively.
- 5. a kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor according to claim 4, its feature It is, the spiral winded type optical fiber (2-2) is single spiral, or is the single spiral tandem of more than 2.
- 6. a kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor according to claim 4, its feature It is：The spiral winded type optical fiber (2-2) is general single mode fiber, and the general single mode fiber is Brillouin spectrum For unimodal optical fiber, the fiber grating (3) is Bragg grating.
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| CN201720783584.3U CN207248706U (en) | 2017-06-30 | 2017-06-30 | A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor |
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| CN201720783584.3U CN207248706U (en) | 2017-06-30 | 2017-06-30 | A kind of prestress anchorage cable corrosion damage monitoring device based on Fibre Optical Sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319862A (en) * | 2019-07-11 | 2019-10-11 | 南京法艾博光电科技有限公司 | A kind of helical structure device for distributing optical fiber sensing in civil engineering |
| CN111289474A (en) * | 2020-03-11 | 2020-06-16 | 大连理工大学 | Intelligent anchorage device for monitoring corrosion fracture of prestressed steel strand |
-
2017
- 2017-06-30 CN CN201720783584.3U patent/CN207248706U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319862A (en) * | 2019-07-11 | 2019-10-11 | 南京法艾博光电科技有限公司 | A kind of helical structure device for distributing optical fiber sensing in civil engineering |
| CN110319862B (en) * | 2019-07-11 | 2021-03-30 | 南京法艾博光电科技有限公司 | A helical structure device for distributed optical fiber sensing among civil engineering |
| CN111289474A (en) * | 2020-03-11 | 2020-06-16 | 大连理工大学 | Intelligent anchorage device for monitoring corrosion fracture of prestressed steel strand |
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