CN106949996A - Optical fiber grating intelligent steel strand and its monitoring system and scaling method - Google Patents
Optical fiber grating intelligent steel strand and its monitoring system and scaling method Download PDFInfo
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- CN106949996A CN106949996A CN201710291243.9A CN201710291243A CN106949996A CN 106949996 A CN106949996 A CN 106949996A CN 201710291243 A CN201710291243 A CN 201710291243A CN 106949996 A CN106949996 A CN 106949996A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 184
- 239000010959 steel Substances 0.000 title claims abstract description 184
- 239000013307 optical fiber Substances 0.000 title claims abstract description 61
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 60
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 70
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000012360 testing method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of optical fiber grating intelligent steel strand and its monitoring system and scaling method, the periphery steel wire twisting shaping wound by core wire and around core wire, the periphery wall of the core wire is provided with along the axially extending groove of core wire, fixation is packaged with optical fiber in the groove, the optical fiber is drawn from center steel cord end, and the optical fiber is provided with fiber-optic grating sensor.Fiber-optic grating sensor is implanted into the core wire of traditional steel strand wires by the optical fiber grating intelligent steel strand of the present invention, the real-time monitoring of prestress wire stress is realized by monitoring fiber grating change, steel strand wires hidden danger is found in advance, security is greatly improved, and be hardly damaged.
Description
Technical field
The present invention relates to bridge or building monitoring field, and in particular to a kind of optical fiber grating intelligent steel strand and its monitoring
System and scaling method.
Background technology
In bridge and railway basic component, carrier of the steel strand wires as concrete component is widely used.Every steel strand wires
It is to be made up of many steel wire windings, in use, every steel strand wires are all in extended state.Traditional test monitoring hand
Section, the shortcomings of there is low precision, poor operability, be disturbed that influence is big, stability is poor, can not realize on-line real time monitoring, is answered
Prestress wire is monitored with them.The change of the tension of every steel strand wires in use can not be monitored, when
Wherein one steel strand wires are due to alignment error or the big stress state of burst occur so that its work tension exceedes its surrender should
During power, steel strand wires can be in surrender extended state, and when deformation values overstep the extreme limit, this root steel strand wires maximum bearing stress drastically becomes
It is small, it is broken.Cause other steel strand wires working stresses increases because wherein one steel strand wires lose the job ability, greatly increase
Add the risk of overall steel strand wires fracture, endanger the safety of the buildings such as whole bridge, roadbed.
The fiber-optic grating sensor grown up in the recent period, is a kind of sensing element of function admirable, and it can pass through Prague
The movement of reflection wavelength is realized to structural strain on-line measurement to sense the change of extraneous minimal stress.It, which not only has, is not afraid of evil
Bad environment, not by ambient noise interference, electromagnetism interference, collection sensing and to be transmitted in one, simple structure, easy to use etc. excellent
Point, but also have the advantages that high-precision absolute measurement, quasi-distributed digital measurement can be carried out to the strain of structure.
Although the existing intelligent steel strand occurred, the central hair of intelligent steel strand uses new fibrous composite, its
Occurs transport difficult in use：New fibrous composite and optical fiber belongs to friable material, in jolting for transport
Cheng Zhong, is easily broken.And because the self-characteristic of new fibrous composite, its coefficient of elasticity is outer far below steel strand wires
Silk, after tensioning and putting, different degrees of relative displacement occurs in central hair and outer silk, leads to not demarcation, then without repeatedly
Precision；Again because central hair is different from the material of outer silk, its coefficient of thermal expansion and contraction is also different, and its temperature-compensating is also difficult to.
And the calibration process of intelligent steel strand typically carries out assert that rower is determined at the construction field (site) at present, due to intelligent steel strand
Calibration process it is strict to installation site requirement, job site does not reach installation site requirement and fiber-optic grating sensor is easily damaged
Bad the characteristics of, make calibration process not accurate enough and intelligent steel strand is easily damaged, it is necessary to carried out indoors using special device
The demarcation of intelligent steel strand.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of optical fiber grating intelligent steel strand and its monitoring
Fiber-optic grating sensor is implanted into the center of traditional steel strand wires by system and scaling method, optical fiber grating intelligent steel strand of the invention
In steel wire, the real-time monitoring of prestress wire stress is realized by monitoring fiber grating change, finds that steel is twisted in advance
Line hidden danger, is greatly improved security, and be hardly damaged.The intelligent steel strand of the present invention can avoid risk, and every is monitored in real time
Steel strand wires stress, can be used in wisdom science of bridge building.The present invention represents a branch of steel strand wires with one, and one is represented with multi beam
Individual face, the stressing conditions of bridge are monitored with this.
The object of the present invention is achieved like this：A kind of optical fiber grating intelligent steel strand, by core wire and around center
The periphery steel wire twisting shaping of steel wire winding, the periphery wall of the core wire is provided with along the axially extending groove of core wire,
Fixed in the groove to be packaged with optical fiber, the optical fiber is drawn from center steel cord end, and the optical fiber is provided with optical fiber grating sensing
Device.
Preferably, the optical fiber is fixed by special sealing and is encapsulated in the groove of core wire, it is of course also possible to use
Other method carries out sealing.
The two ends of the groove axially penetrate through core wire.
The optical fiber is provided with least two fiber-optic grating sensors.The stress section of the intelligent steel strand is provided with the first optical fiber light
Gate sensor, the first fiber-optic grating sensor is used to detect that force value changes, and the non-stress section of the intelligent steel strand is provided with second
Fiber-optic grating sensor.The change of sensor wavelength is caused according to the change of environment temperature, the sensor at non-stress end is exactly to use
To test the wavelength change caused by variation of ambient temperature.First fiber-optic grating sensor, the second fiber-optic grating sensor
Lead-out wire be connected with fiber Bragg grating (FBG) demodulator.Two sensors are that same optical fiber is drawn.The fiber Bragg grating (FBG) demodulator is used
In by the optical wavelength number of the optical wavelength data of the first fiber-optic grating sensor of collection and the second fiber-optic grating sensor
According to computer is passed to, the computer is used for the optical wavelength data for receiving the second fiber-optic grating sensor, determines wavelength
Compensation rate；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor, and according to the compensation rate of wavelength
Optical wavelength data to the first fiber-optic grating sensor carry out temperature-compensating, bring the optical wavelength data λ after compensation into marks
Surely the force value and the linear relation F=k λ+A of wavelength obtained, calculates the force value obtained suffered by steel strand wires reality.If steel strand wires are mended
Optical wavelength data λ after repaying changes, then its stress F also changes, and the force value after change can be calculated by formula big
It is small, then theoretical force value during with engineering design compared, and to realize the real-time monitoring of prestress wire stress, is found in advance
Steel strand wires hidden danger.
The fiber Bragg grating (FBG) demodulator passes data to computer, and computer is connected by network with terminal device, leads to
Cross the real-time monitoring that terminal device realizes steel strand wires stress.
The wavelength of first fiber-optic grating sensor of the stress section of intelligent steel strand is with force value（The force value is that steel strand wires make
Used time, because of the force value of requirement of engineering tensioning）Change and change, and the non-stress of intelligent steel strand section the second fiber grating pass
The wavelength of sensor does not change with the change of force value, the first fiber-optic grating sensor, the second fiber-optic grating sensor wavelength it is equal
Change with the change of outside air temperature.
The stress section of the intelligent steel strand of the present invention can set one or more first fiber gratings according to actual needs
Sensor, the non-stress section of intelligent steel strand of the invention sets second fiber-optic grating sensor.
A kind of monitoring system of optical fiber grating intelligent steel strand stress, including computer, fiber Bragg grating (FBG) demodulator with
And the optical fiber grating intelligent steel strand described in claim 1, the stress section of the intelligent steel strand is provided with the first fiber grating biography
Sensor, the first fiber-optic grating sensor is used to detect that force value changes, and the non-stress section of the intelligent steel strand is provided with the second optical fiber
Grating sensor, the second fiber-optic grating sensor is used to test wavelength, the first optical fiber light caused by variation of ambient temperature
Gate sensor, the lead-out wire of the second fiber-optic grating sensor are connected with fiber Bragg grating (FBG) demodulator, and the fiber Bragg grating (FBG) demodulator is used
In by the optical wavelength number of the optical wavelength data of the first fiber-optic grating sensor of collection and the second fiber-optic grating sensor
According to computer is passed to, the computer is used for the optical wavelength data for receiving the second fiber-optic grating sensor, determines wavelength
Compensation rate；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor, and according to the compensation rate of wavelength
Optical wavelength data to the first fiber-optic grating sensor carry out temperature-compensating, bring the optical wavelength data after compensation into demarcation
Obtained force value and the linear relation of wavelength, calculates the force value obtained suffered by steel strand wires reality.The fiber Bragg grating (FBG) demodulator
Computer is passed data to, computer is connected by network with terminal device, steel strand wires stress shape is realized by terminal device
The real-time monitoring of state.
A kind of scaling method of intelligent steel strand, comprises the following steps：
1）Several force value calibration points are set；
2）Jack carries out tensioning successively, fiber Bragg grating (FBG) demodulator collection intelligence to intelligent steel strand according to calibration point force value size
The optical wavelength data of the fiber-optic grating sensor of stress section, are corresponded with each calibration point force value, while pressure in steel strand wires
The pressure value that sensor collection intelligent steel strand is subject to, is corresponded with the optical wavelength data that fiber Bragg grating (FBG) demodulator is gathered,
Tensioning is demarcated after force value to maximum, is slowly put and is opened, using one-to-one pressure Value Data and optical wavelength data, calculates
The linear relation of pressure value and wavelength, be：Pressure value=coefficient × wavelength+constant.
Preferably, step 2）Middle jack carries out tensioning successively to intelligent steel strand according to calibration point force value size, described
Fiber Bragg grating (FBG) demodulator collection intelligent steel strand in non-stress end fiber-optic grating sensor optical wavelength data λ a and by
The optical wavelength data λ b of the fiber-optic grating sensor at power end, are corresponded with each calibration point force value, while pressure sensor is adopted
The pressure value that collection intelligent steel strand is subject to, is corresponded, tensioning is to most with the optical wavelength data that fiber Bragg grating (FBG) demodulator is gathered
After big demarcation force value, slowly put and open, using one-to-one pressure Value Data F and optical wavelength data λ, λ=λ b- λ a, calculate
Go out pressure value F and the linear relation F=k λ+A of wavelength X.In the case of non-stress, the first fiber-optic grating sensor and second
The wavelength of fiber-optic grating sensor is all only influenced by temperature, and two wavelength are the same.
This scaling method also includes step 3）：Force value check post is chosen, jack is right again according to check post force value size
Intelligent steel strand carries out tensioning, the optical wavelength number of the fiber-optic grating sensor of fiber Bragg grating (FBG) demodulator collection intelligent steel strand
According to, while the pressure value that pressure sensor collection intelligent steel strand is subject to, then according to step 2）Obtained linear relationship is by light
The optical wavelength data corresponding conversion of the fiber-optic grating sensor of fine grating demodulation instrument collection is force value data, and will be converted to
The pressure value that is gathered with pressure sensor of force value be compared, if the scope that the difference that both can overlap or both allows in error
It is interior, that is, demarcate successfully, otherwise, return to step 1）Re-scaled.
The fiber Bragg grating (FBG) demodulator, pressure sensor and computer are communicated, and the computer is used to receive light wave
Wavelength data and pressure Value Data, calculate the linear relation of pressure value and wavelength.The present invention uses manual control hydraulic
Pumping plant, control jack carries out tensioning successively according to calibration point force value size to intelligent steel strand.
A kind of caliberating device of intelligent steel strand, including reaction frame, the reaction frame, which is provided with, to be used to wear for intelligent steel strand
The via crossed a, termination of the reaction frame is provided with moveable anchor, and the moveable anchor is provided with bellmouth, and the moveable anchor is with passing through it
Tool clamping piece is provided between the intelligent steel strand of bellmouth, the tool clamping piece is used to clamp intelligence in the bellmouth of moveable anchor
Energy steel strand wires, another termination of the reaction frame is provided with jack, and the jack is connected with intelligent steel strand, for intelligence
Steel strand wires carry out tensioning, and the oil inlet of the jack, oil return opening are connected by pipeline with hydraulic power unit respectively, and jack is by liquid
Stretched after the fuel feeding of press pump station.Pressure sensor, the intelligent steel are provided between the end face of the jack and the end face of reaction frame
The lead-out wire of the fiber-optic grating sensor of twisted wire is connected with fiber Bragg grating (FBG) demodulator, and the fiber Bragg grating (FBG) demodulator enters with computer
Row communication.
The first backing plate, the pressure sensor are provided between one axial end of the pressure sensor and the end face of jack
Another axial end and reaction frame end face between be provided with the second backing plate.Pressure sensor is axially positioned on the first backing plate and second
Between backing plate.
Two axial ends of reaction frame are equipped with recessed seam, for being positioned respectively to moveable anchor, the second backing plate, make anti-
Power frame is used for the axial line and pressure sensor of the axial line of the via passed through for intelligent steel strand and the bellmouth of moveable anchor
The axial line of axis hole for being passed through for intelligent steel strand is located at same straight line.The reaction frame is used to pass through for intelligent steel strand
Via centered on hole.There is jack intermediate plate in the jack, intelligent steel is clamped when jack intermediate plate stretches for jack
Twisted wire.
The pressure sensor is used for the pressure signal transmission of collection to pressure display table, and the pressure display table is used for
The pressure value in intelligent steel strand is shown in real time.
Beneficial effects of the present invention are：The optical fiber grating intelligent steel strand of the present invention has all mechanics of traditional steel strand wires
Performance and performance, the periphery steel wire twisting shaping that it winds by core wire and around core wire, the core wire
Periphery wall be provided with along the axially extending groove of core wire, fixed in the groove to be packaged with optical fiber, the optical fiber is from central steel
Silk end is drawn, and the optical fiber is provided with fiber-optic grating sensor.Profile fiber and optical fiber light along its length in core wire
Gate sensor.The present invention possesses the mechanical property of traditional steel strand wires, and its sensing characteristics has all advantages of fiber grating.This hair
The construction that bright optical fiber grating intelligent steel strand can be applied to current wisdom science of bridge building is used, and more can easily grasp steel
Stressing conditions of the twisted wire in construction and during one's term of military service, instruct prestressed stretch-draw and construction.
Fiber-optic grating sensor is implanted into the core wire of traditional steel strand wires by the present invention, is changed by monitoring fiber grating
To realize the real-time monitoring of prestress wire stress, steel strand wires hidden danger is found in advance, security, and this hair is greatly improved
It is bright to help to realize whole bridge or the real-time monitoring of building and intelligent management.When the present invention is applied in concrete,
Due to being consolidated with concrete, concrete can be found early with the STRESS VARIATION in indirect reaction concrete work state
The presence of the defects such as middle crack.It is easy to make and the present invention is simple in construction, is hardly damaged, suit large area to popularize.
Because the stress section of the intelligent steel strand of the present invention is provided with the first fiber-optic grating sensor, the first optical fiber grating sensing
Device is used to detect that force value changes, and the non-stress section of the intelligent steel strand is provided with the second fiber-optic grating sensor.According to environment temperature
The change of degree causes the change of sensor wavelength, and the sensor at non-stress end is exactly to be used for testing caused by variation of ambient temperature
Wavelength change.First fiber-optic grating sensor, the second fiber-optic grating sensor lead-out wire and fiber Bragg grating (FBG) demodulator
Connection, the fiber Bragg grating (FBG) demodulator is used for the optical wavelength data and the second light of the first fiber-optic grating sensor of collection
The optical wavelength data transfer of fiber grating sensor is to computer, and the computer is used to receive the second fiber-optic grating sensor
Optical wavelength data, determine the compensation rate of wavelength；The computer is used for the optical wavelength for receiving the first fiber-optic grating sensor
Data, and temperature-compensating is carried out to the optical wavelength data of the first fiber-optic grating sensor according to the compensation rate of wavelength, it will compensate
Optical wavelength data afterwards bring the linear relation of force value obtained by calibrating and wavelength into, and calculating is obtained suffered by steel strand wires reality
Force value.The present invention adds fiber-optic grating sensor at the non-stress end of optical fiber grating intelligent steel strand, as a wavelength with temperature
The benchmark that degree changes and changed, fiber-optic grating sensor and the fiber optical grating intelligent steel at optical fiber grating intelligent steel strand non-stress end
The fiber-optic grating sensor of twisted wire force side is consistent, i.e., when only temperature influence, initial wavelength is consistent.When demarcation two
The initial wavelength of sensor is consistent, and the wavelength of the fiber-optic grating sensor of stress section changes with the change of force value, and non-stress
The wavelength of the fiber-optic grating sensor at end is constant.With the change of outside air temperature, the wavelength of two sensorses also changes therewith, the present invention
Using the wavelength value of the fiber-optic grating sensor at non-stress end as stress section fiber-optic grating sensor temperature-compensating so that this
The intelligent steel strand of invention can easily realize temperature-compensating so that the present invention is high to the monitoring accuracy of prestress wire.
The present invention installs intelligent steel strand and pressure sensor, jack pair steel strand wires force, its utilization using reaction frame
Fiber Bragg grating (FBG) demodulator gathers the wavelength data of fiber-optic grating sensor, and wavelength data is corresponding with the force value of pressure sensor,
The mathematical relationship of the two is found out, most wavelength data converting to force Value Data at last, realize the demarcation of intelligent steel strand, and demarcation can
To carry out indoors, another calibration process is accurate, and intelligent steel strand is not allowed fragile yet.
The invention will be further described with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is the structural representation of the optical fiber grating intelligent steel strand of the present invention；
Fig. 2 is the schematic cross-section of the optical fiber grating intelligent steel strand of the present invention；
Fig. 3 is the schematic diagram of the caliberating device of intelligent steel strand；
Fig. 4 is the linear relationship schematic diagram that force value changes correspondence optical wavelength change.
In accompanying drawing, 1 is tool clamping piece, and 2 be moveable anchor, and 3 be reaction frame, and 4 be steel wire centered on intelligent steel strand, 41,411
It is periphery steel wire for groove, 42,43 be optical fiber, and 431 be the first fiber-optic grating sensor, and 432 be the second fiber-optic grating sensor,
5 be optical fiber cord, and 6 be fiber Bragg grating (FBG) demodulator, and 7 be data wire, and 8 be computer, and 9 be the second backing plate, and 10 be pressure sensor,
11 be pressure line, and 12 be the first backing plate, and 13 be jack intermediate plate, and 14 be pressure display table, and 15 be jack.
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of optical fiber grating intelligent steel strand is wound by core wire 41 and around core wire
The twisting of periphery steel wire 42 is molded, and the periphery wall of the core wire 41 is provided with along the axially extending groove 411 of core wire, and this is recessed
Fixed in groove to be packaged with optical fiber 43, the optical fiber is fixed by special sealing and is encapsulated in the groove of core wire.The optical fiber
Drawn from center steel cord end, the two ends of the groove axially penetrate through core wire.The optical fiber is provided with optical fiber grating sensing
Device.
The stress section of the intelligent steel strand is provided with the first fiber-optic grating sensor 431, and the first fiber-optic grating sensor is used
In detection force value change, the non-stress section of the intelligent steel strand is provided with the second fiber-optic grating sensor 432.According to environment temperature
Change cause the change of sensor wavelength, the sensor at non-stress end is exactly to be used for testing the ripple caused by variation of ambient temperature
Long change.First fiber-optic grating sensor, the lead-out wire of the second fiber-optic grating sensor are connected with fiber Bragg grating (FBG) demodulator,
The fiber Bragg grating (FBG) demodulator is used for the optical wavelength data of the first fiber-optic grating sensor of collection and the second optical fiber light
The optical wavelength data transfer of gate sensor is to computer, and the computer is used for the light wave for receiving the second fiber-optic grating sensor
Wavelength data, determines the compensation rate of wavelength；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor,
And temperature-compensating is carried out to the optical wavelength data of the first fiber-optic grating sensor according to the compensation rate of wavelength, by the light after compensation
Ripple wavelength data λ brings the linear relation F=k λ+A of force value obtained by calibrating and wavelength into, and it is actual suffered that calculating obtains steel strand wires
Force value.If the optical wavelength data λ after steel strand wires compensation changes, its stress F also changes, by formula finally
The force value size gone out after change, then theoretical force value during with engineering design are compared, to realize prestress wire stress
Monitoring in real time, finds steel strand wires hidden danger in advance.Steel strand wires beyond two anchorages are interval all do not stress.According to the end that do not stress
The optical wavelength data of fiber-optic grating sensor can draw environment temperature.
The wavelength of first fiber-optic grating sensor of the stress section of intelligent steel strand is with force value（The force value is that steel strand wires make
Used time, because of the force value of requirement of engineering tensioning）Change and change, and the non-stress of intelligent steel strand section the second fiber grating pass
The wavelength of sensor does not change with the change of force value, the first fiber-optic grating sensor, the second fiber-optic grating sensor wavelength it is equal
Change with the change of outside air temperature.The stress section of the intelligent steel strand of the present invention can set one or many according to actual needs
Individual first fiber-optic grating sensor, the non-stress section of intelligent steel strand of the invention sets second fiber-optic grating sensor to be
Can.
A kind of monitoring system of optical fiber grating intelligent steel strand stress, including computer, fiber Bragg grating (FBG) demodulator with
And the optical fiber grating intelligent steel strand described in claim 1, the stress section of the intelligent steel strand is provided with the first fiber grating biography
Sensor, the first fiber-optic grating sensor is used to detect that force value changes, and the non-stress section of the intelligent steel strand is provided with the second optical fiber
Grating sensor, the second fiber-optic grating sensor is used to test wavelength, the first optical fiber light caused by variation of ambient temperature
Gate sensor, the lead-out wire of the second fiber-optic grating sensor are connected with fiber Bragg grating (FBG) demodulator, and the fiber Bragg grating (FBG) demodulator is used
In by the optical wavelength number of the optical wavelength data of the first fiber-optic grating sensor of collection and the second fiber-optic grating sensor
According to computer is passed to, the computer is used for the optical wavelength data for receiving the second fiber-optic grating sensor, determines wavelength
Compensation rate；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor, and according to the compensation rate of wavelength
Optical wavelength data to the first fiber-optic grating sensor carry out temperature-compensating, bring the optical wavelength data after compensation into demarcation
Obtained force value and the linear relation of wavelength, calculates the force value obtained suffered by steel strand wires reality.The fiber Bragg grating (FBG) demodulator
Computer is passed data to, computer is connected by network with terminal device, steel strand wires stress shape is realized by terminal device
The real-time monitoring of state.
Referring to Fig. 3, a kind of caliberating device of intelligent steel strand, including reaction frame 3, the reaction frame 3, which is provided with, to be used to supply intelligence
The via that energy steel strand wires 4 are passed through a, termination of the reaction frame 3 is provided with moveable anchor 2, and the moveable anchor 2 is provided with bellmouth, described
Moveable anchor 2 and tool clamping piece 1 is provided with through the intelligent steel strand of its bellmouth, the tool clamping piece 1 is mounted in moveable anchor 2
It is used to clamp intelligent steel strand in bellmouth, another termination of the reaction frame 3 is provided with jack, the jack and intelligent steel
Twisted wire is connected, and for carrying out tensioning to intelligent steel strand, the oil inlet of the jack, oil return opening pass through pipeline and hydraulic pressure respectively
Pumping plant is connected, and jack after hydraulic power unit fuel feeding by stretching.Provided with pressure between the end face of the jack and the end face of reaction frame 3
Force snesor 10.The first backing plate 12, the pressure are provided between one axial end of the pressure sensor 10 and the end face of jack
The second backing plate 9 is provided between another axial end of force snesor 10 and the end face of reaction frame 3.Pressure sensor 10 is axially positioned on
Between first backing plate 12 and the second backing plate 9.Two axial ends of reaction frame 3 are equipped with recessed seam, for respectively to moveable anchor 2,
Second backing plate 9 is positioned, and reaction frame 3 is used for for the taper of the axial line of via and moveable anchor 2 that passes through of intelligent steel strand
The axial line that the axial line and pressure sensor 10 in hole are used for the axis hole passed through for intelligent steel strand is located at same straight line.It is described
Reaction frame 3 is used for hole centered on the via that confession intelligent steel strand is passed through.There are jack intermediate plate 13, jack in the jack 15
Intermediate plate clamps intelligent steel strand when being stretched for jack.The lead-out wire and light of the fiber-optic grating sensor of the intelligent steel strand
Fine grating demodulation instrument connection, the fiber Bragg grating (FBG) demodulator is communicated with computer.Optical fiber grating sensing described in the present embodiment
Device is connected to fiber Bragg grating (FBG) demodulator 6 by optical fiber cord 5.Fiber Bragg grating (FBG) demodulator 6 is connected to computer 8 by data wire 7.
The pressure sensor 10 is used for the pressure signal transmission of collection to pressure display table, and the pressure display table is used for aobvious in real time
Show the pressure value in intelligent steel strand.Pressure sensor is connected by pressure line 11 with pressure display table 14.The fiber grating
(FBG) demodulator is the equipment for showing optical wavelength.
The scaling method of the intelligent steel strand of the present invention, comprises the following steps：
1. reaction frame and intelligent steel strand are installed according to calibration request.Pressure sensor, jack are installed in reaction frame one end, instead
The power frame other end installs steel strand wires moveable anchor and tool clamping piece anchoring.Pressure sensor is axially positioned on the first backing plate and second
Between backing plate.
2. the plug of a fiber-optic grating sensor is connected to fiber Bragg grating (FBG) demodulator, pressure sensor and pressure display table
Connection, reads and records the initial wavelength data λ a of fiber-optic grating sensor, now, the optical fiber light of stress section in intelligent steel strand
The optical wavelength data of gate sensor are identical with the optical wavelength data of the fiber-optic grating sensor of non-stress section.Fiber grating solution
Instrument is adjusted to be connected to form a system with computer.
3. several calibration points are determined according to the size of demarcation force value.
4. jack carries out tensioning successively, the fiber Bragg grating (FBG) demodulator according to calibration point force value size to intelligent steel strand
Gather the optical wavelength data λ a and the fiber grating of force side of the fiber-optic grating sensor at non-stress end in intelligent steel strand
The optical wavelength data λ b of sensor, with each calibration point force value correspond, while pressure sensor gather intelligent steel strand by
The pressure value arrived, is corresponded with the optical wavelength data that fiber Bragg grating (FBG) demodulator is gathered, after tensioning to maximum demarcation force value, slowly
Slow play, using one-to-one pressure Value Data F and optical wavelength data λ, λ=λ b- λ a, calculates pressure value F and wavelength
λ linear relation F=k λ+A, and with this linear relationship（Formula）Do next step to use, such as a linear relationship curve such as Fig. 4 institutes
Show.N is taken during demarcation（Such as 1KN, 2KN, 5KN ...）Individual force value, corresponding force value and wavelength is used respectively、、、
……With、、、……Represent, k values and A values are calculated according to formula.
The fiber Bragg grating (FBG) demodulator, pressure sensor and computer are communicated, and the computer is used to receive light wave
Wavelength data and pressure Value Data, calculate the linear relation of pressure value and wavelength.The present invention uses manual control hydraulic
Pumping plant, control jack carries out tensioning successively according to calibration point force value size to intelligent steel strand.
5. choosing force value check post, jack carries out tensioning, light to intelligent steel strand again according to check post force value size
The optical wavelength data of the fiber-optic grating sensor of stress section in fine grating demodulation instrument collection intelligent steel strand, while pressure sensing
The pressure value that device collection intelligent steel strand is subject to, then according to step 3）Obtained linear relationship is corresponding by optical wavelength data λ
Force value data F is converted to, and the pressure value that the force value being converted to is gathered with pressure sensor is compared, if both can weight
The difference of conjunction or both demarcates successfully in the range of error permission, otherwise, return to step 1）Re-scaled.
6. record preserves nominal data, and correspondence is numbered with the steel strand wires of demarcation.
The demarcation of the present invention is in laboratory（Thermostatic chamber）Complete.In actual applications, stress section is surveyed into wavelength X
B subtracts the compensation rate λ a of wavelength, the optical wavelength data λ after being compensated, and brings the linear relation of pressure value and wavelength into, calculates
Force value suffered by reality, with being contrasted according to the theoretical force value of engineering design when institute budget, determines the force-bearing situation of the steel strand wires, comes
The real-time monitoring of prestress wire stress is realized, steel strand wires hidden danger is found in advance.
The intelligent steel strand of the present invention can apply to prestressing force wisdom engineering structure such as bowstring arch bridge, cable-stayed bridge, suspension cable
Bridge, external tendon, earth anchor etc..
The present invention is not limited solely to above-described embodiment, enters in the case of without departing substantially from technical solution of the present invention spirit
The technical scheme of row few modifications, should fall into protection scope of the present invention.
Claims (10)
1. a kind of optical fiber grating intelligent steel strand, it is characterised in that：The periphery steel wound by core wire and around core wire
Silk twisting shaping, the periphery wall of the core wire is provided with along the axially extending groove of core wire, fixed encapsulation in the groove
There is optical fiber, the optical fiber is drawn from center steel cord end, and the optical fiber is provided with fiber-optic grating sensor.
2. optical fiber grating intelligent steel strand according to claim 1, it is characterised in that：The optical fiber is solid by special sealing
Surely it is encapsulated in the groove of core wire, the two ends of the groove axially penetrate through core wire.
3. optical fiber grating intelligent steel strand according to claim 1, it is characterised in that：The stress section of the intelligent steel strand
Provided with the first fiber-optic grating sensor, the first fiber-optic grating sensor be used for detect force value change, the intelligent steel strand it is non-
Stress section is provided with the second fiber-optic grating sensor, and the second fiber-optic grating sensor is used to test the ripple caused by variation of ambient temperature
Long, first fiber-optic grating sensor, the lead-out wire of the second fiber-optic grating sensor are connected with fiber Bragg grating (FBG) demodulator, described
Fiber Bragg grating (FBG) demodulator is used to pass the optical wavelength data of the first fiber-optic grating sensor of collection and the second fiber grating
The optical wavelength data transfer of sensor is to computer, and the computer is used for the optical wavelength for receiving the second fiber-optic grating sensor
Data, determine the compensation rate of wavelength；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor, and root
Temperature-compensating is carried out to the optical wavelength data of the first fiber-optic grating sensor according to the compensation rate of wavelength, by the light wave ripple after compensation
Long data bring the linear relation of force value obtained by calibrating and wavelength into, calculate the force value obtained suffered by steel strand wires reality.
4. a kind of monitoring system of optical fiber grating intelligent steel strand stress, it is characterised in that：Including computer, fiber grating
Optical fiber grating intelligent steel strand described in (FBG) demodulator and claim 1, the stress section of the intelligent steel strand is provided with the first light
Fiber grating sensor, the first fiber-optic grating sensor is used to detect that force value changes, and the non-stress section of the intelligent steel strand is provided with
Second fiber-optic grating sensor, the second fiber-optic grating sensor is used to test the wavelength caused by variation of ambient temperature, described the
One fiber-optic grating sensor, the lead-out wire of the second fiber-optic grating sensor are connected with fiber Bragg grating (FBG) demodulator, the fiber grating
(FBG) demodulator is used for the light of the optical wavelength data of the first fiber-optic grating sensor of collection and the second fiber-optic grating sensor
Ripple wavelength data passes to computer, and the computer is used for the optical wavelength data for receiving the second fiber-optic grating sensor, really
The compensation rate of standing wave length；The computer is used for the optical wavelength data for receiving the first fiber-optic grating sensor, and according to wavelength
Compensation rate temperature-compensating is carried out to the optical wavelength data of the first fiber-optic grating sensor, by the optical wavelength data after compensation
Bring the linear relation of force value obtained by calibrating and wavelength into, calculate the force value obtained suffered by steel strand wires reality.
5. monitoring system according to claim 4, it is characterised in that：The fiber Bragg grating (FBG) demodulator passes data to meter
Calculation machine, computer is connected by network with terminal device, and the real-time monitoring of steel strand wires stress is realized by terminal device.
6. a kind of scaling method of the intelligent steel strand described in claim 1, it is characterised in that：Comprise the following steps：
1）Several force value calibration points are set；
2）Jack carries out tensioning successively, fiber Bragg grating (FBG) demodulator collection intelligence to intelligent steel strand according to calibration point force value size
The optical wavelength data of the fiber-optic grating sensor of stress section, are corresponded with each calibration point force value, while pressure in steel strand wires
The pressure value that sensor collection intelligent steel strand is subject to, is corresponded with the optical wavelength data that fiber Bragg grating (FBG) demodulator is gathered,
Tensioning is demarcated after force value to maximum, is slowly put and is opened, using one-to-one pressure Value Data and optical wavelength data, calculates
The linear relation of pressure value and wavelength, be：Pressure value=coefficient × wavelength+constant.
7. method according to claim 6, it is characterised in that：Step 2）Middle jack is according to calibration point force value size to intelligence
Energy steel strand wires carry out the optical fiber grating sensing at non-stress end in tensioning successively, the fiber Bragg grating (FBG) demodulator collection intelligent steel strand
The optical wavelength data λ a of device and the fiber-optic grating sensor of force side optical wavelength data λ b, with each calibration point force value one
One correspondence, while the pressure value that pressure sensor collection intelligent steel strand is subject to, the light wave ripple gathered with fiber Bragg grating (FBG) demodulator
Long data are corresponded, and after tensioning to maximum demarcation force value, are slowly put and are opened, utilize one-to-one pressure Value Data F and light wave
Wavelength data λ, λ=λ b- λ a, calculate pressure value F and the linear relation F=k λ+A of wavelength X.
8. the method according to claim 6 or 7, it is characterised in that：Also include step 3）：Force value check post is chosen, it is very heavy
Top carries out tensioning to intelligent steel strand again according to check post force value size, and fiber Bragg grating (FBG) demodulator gathers the light of intelligent steel strand
The optical wavelength data of fiber grating sensor, while the pressure value that is subject to of pressure sensor collection intelligent steel strand, then basis
Step 2）The optical wavelength data correspondence for the fiber-optic grating sensor that obtained linear relationship gathers fiber Bragg grating (FBG) demodulator turns
Force value data are changed to, and the pressure value that the force value being converted to is gathered with pressure sensor is compared, if both can overlap
Or both difference error permission in the range of, that is, demarcate successfully, otherwise, return to step 1）Re-scaled.
9. a kind of caliberating device of the intelligent steel strand described in claim 1, it is characterised in that：Including reaction frame, the counter-force
The via having for being passed through for intelligent steel strand is set up, a termination of the reaction frame is provided with moveable anchor, and the moveable anchor is provided with
Bellmouth, the moveable anchor and is provided with tool clamping piece through the intelligent steel strand of its bellmouth, and the tool clamping piece is mounted in
It is used to clamp intelligent steel strand in the bellmouth of moveable anchor, another termination of the reaction frame is provided with jack, the jack
It is connected with intelligent steel strand, for carrying out tensioning to intelligent steel strand, the oil inlet of the jack, oil return opening pass through pipe respectively
Road is connected with hydraulic power unit, and pressure sensor, the intelligent steel are provided between the end face of the jack and the end face of reaction frame
The lead-out wire of the fiber-optic grating sensor of twisted wire is connected with fiber Bragg grating (FBG) demodulator.
10. the caliberating device of intelligent steel strand according to claim 9, it is characterised in that：The fiber Bragg grating (FBG) demodulator,
Pressure sensor is communicated with computer, and the computer is used to receive optical wavelength data and pressure Value Data, calculates
Go out pressure value and the relational expression of wavelength.
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| CN113108985A (en) * | 2021-03-15 | 2021-07-13 | 山西省交通科技研发有限公司 | Correction calculation method for tensile value of core wire embedded grating intelligent steel strand |
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