CN1400451A - Monitoring method of long-period working state of optical fibre grating anchor wire and its equipment - Google Patents
Monitoring method of long-period working state of optical fibre grating anchor wire and its equipment Download PDFInfo
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- CN1400451A CN1400451A CN02138980.2A CN02138980A CN1400451A CN 1400451 A CN1400451 A CN 1400451A CN 02138980 A CN02138980 A CN 02138980A CN 1400451 A CN1400451 A CN 1400451A
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Abstract
The invention is a method to monitor the long-period working state of anchorage cable in which fiber-optical grating is planted. Multiple quasi-distributional fiber-optical grating respectively sense stress strain of each distributional point in the anchorage cable strand to make the reflecting light wavelength change and then come out through the transmission fiber-optical from the measuring spot; the demodulator detects the magnitude of its wavelength change and then converts this to electric signal sent to the quadratic instrument which calculates the magnitude of the stress strain as well as the whole distributional state of the anchorage cable. The equipment includes multi-point distributional fiber-optical gratings, transmission fiber-optial, demodulator of fiber-optical grating and quadratic instrument.
Description
Technical field
The present invention relates to a kind of signal detection technique, particularly relate to a kind of method and device of monitoring at the long-term work state of fiber grating anchor cable.
Background technology:
In industries such as water conservancy, water power, building, traffic, extensively adopt the gordian technique difficult problem in the prestressed anchorage technology solution engineering now.So-called prestress anchoraging (anchor cable) technology, high-strength steel, steel wire, steel hinge line are become the pull-up structure that is subjected to that is in for a long time under the high-stress state by special technology exactly, thereby strengthen the intensity that is reinforced rock mass, improve the stress state of rock mass, improve the stability of rock mass.At present, prestressed anchorage technology has been widely used in fields such as underground rock cavern reinforcing, slope project reinforcing, structure antidumping and deep basal pit retaining engineering.According to incompletely statistics, kind surplus domestic and international all kinds of rock soil anchor anchor cables have reached 600, anchor pole, anchor cable year, use amount was above 2.5 hundred million.Engineering practice proves, this technology has that cost is low, construction fast, disturb less and give full play to advantage such as material effects, has huge social, economic worth.
The essence that pre-anchor is reinforced is to apply anchor force initiatively: on the one hand the structure of rock mass is strengthened, improve the load-bearing capacity of rock mass greatly, on the other hand, in rock mass, produce pre-anchor extra-stress field, make disadvantageous stress state obtain adjusting and improving, thereby improve the stable fiduciary level of rock mass.Yet the anchor cable loss of prestress is the key factor of restriction anchorage technology development, and prestress can be followed the distortion of rock mass and change.At the anchorage cable stretching initial stage, certain loss promptly takes place in prestress; In use, prestress will be followed the variation of factors such as the loose and underground water of temperature, rock mass creep, steel strand wires in the rock mass and change.And prestress anchoraging mechanism of action complexity, the factor that influences the prestress anchoraging effect is numerous, and it is the focus that domestic and international project circle is paid close attention to that therefore prestressed long duration load changes always.But because its required observation time is long, the expense height, the surveying instrument performance can't meet the demands etc., domestic also have to adopt by increase single anchor anchorage length, increase group's anchor the anchor cable sum, and adopt the method that regularly replaces anchor cable to wait and strengthen factor of assurance.So not only cause the anchor cable huge waste, and can't guarantee engineering safety.In " eight or five " tackling key problem research project, preside over by State Power Corporation, in conjunction with the reinforcing of rock side slope engineering, the anchor mechanism of prestress anchorage cable is studied, but mainly adopted the strain of strain gage testing diverse location steel strand wires; The way at anchored end installation proving ring that the long-term prestress variation of anchor cable is still continued to use is in the past monitored.But these two kinds of measurement means can't fully understand the stress distribution of anchor cable steel strand wires, the long term monitoring stabilizing effect is poor, sensitivity is low, produce the reason of this problem, on the one hand be since with anchor cable contact directly to as if rock soil mass complicated and changeable, anchor cable is embedded in the rock soil mass, and condition of work is very abominable, and is high to waterproof, protection against the tide, anticracking, the corrosion-resistant requirement of sensor.This brings very big difficulty for the monitoring and the research of anchor cable, has also directly influenced the reliability and the serviceable life of instrument.Be the failure mechanism complexity of anchor cable on the other hand, also do not have a kind of anchor cable monitoring instrument can reflect this failure mechanism more all sidedly at present.
Summary of the invention
The object of the present invention is to provide a kind of monitoring method and device that can overcome the fiber grating anchor cable long-term work state of prior art defective, the using optical fibre grating sensing technology is as the sensing nervous system of anchor cable system, can be out of shape the optical fiber grating sensing structure that is complementary with anchor cable, be embedded in the fibre-optical preform that shields, again this fibre-optical preform be stranded in the steel strand wires as wire rope core; Perhaps be embedded on the anchor cable appearance steel strand wires, like this, by the distortion of anchor cable and the caused stress distribution of temperature, environment, static state or dynamic load change make the accurate a plurality of fiber gratings that distribute each distributed points along the line the reflecting light long hair give birth to and change, realize real-time follow-up by the size of surveying its changed wavelength to anchor cable, the in time size of the different parts strain of output anchor cable and rule over time, and finish safety monitoring and globality evaluation to anchor cable.
The object of the present invention is achieved like this: a kind of monitoring method of fiber grating anchor cable long-term work state is characterized in that: 1) go into the optical fiber grating in that monitored anchor cable is mid-; 2) the accurate a plurality of fiber gratings that distribute are experienced the distribute ess-strain of each point of anchor cable steel hinge line respectively along the line, and its catoptrical wavelength is changed, and the reflected light of change spreads out of from measure field through Transmission Fibers; 3) survey the size of its changed wavelength by the fiber grating demodulation device, and to the electric signal of converting, deliver to secondary instrument; 4) calculate the size and the whole anchor cable distribution of the ess-strain of accurate each measuring point that distributes of anchor cable by secondary instrument.
The monitoring device of fiber grating anchor cable long-term work shape of the present invention comprises fiber grating, Transmission Fibers, fiber grating demodulation device and the secondary instrument of the multiple spot distribution of inserting in the monitored anchor cable, wherein, form a quasi-distributed fiber grating sensor-based system by a plurality of fiber gratings, be connected with the fiber grating demodulation device by Transmission Fibers, this fiber grating demodulation device is connected with secondary instrument by data line again.
Prove by domestic and international research and engineering practice: fiber grating distributed sensor technology is the new stage of sensing technology development.Fiber grating sensing technology is by optical grating reflection or the long detection (as shown in Figure 1) of transmitted spectrum cloth loudspeaker lattice wave to writing in optical fiber, realizes by the technology of the measurement of the strain of geodesic structure and temperature value.Fiber grating not only have optical fiber small and exquisite, soft, antijamming capability is strong, collect sensing and be transmitted in one, be easy to make and be easy to imbed features such as material internal, have also simultaneously that the wavelength separated ability is strong, a sensing accuracy and sensitivity is high, can accurately locate and can realize the advantage that absolute number is measured; Particularly it can realize distributed sensor, promptly on an optical fiber, inscribe a plurality of different long gratings of cloth loudspeaker lattice wave according to application requirements, realize the detection of all grating signals at optical fiber one end, and can further assemble the distributed sensor network system, can be widely used in isoparametric real-time, online, the Distributed Detection of stress, strain, temperature to engineering structure, and to structure creep, the real time on-line monitoring of structural parameters such as crack, globality, make it can measure the response of external loads and engineering structure itself to load.Thereby be used as sensing mode first-selected in the current engineering structure, realize monitoring and extraction to multiple-object information in the structure.
The using optical fibre grating sensing technology provides good perception for the exploitation of intelligent anchor cable system and has been transmitted as the sensing nervous system of one.Because optical fiber is very very thin light and handy, can not cause the influence of mechanical property aspect to anchor cable structure, in addition, the present invention still is a kind of absolute digital measurement mode, need not real-time follow-up also can long term monitoring; Have characteristics such as long-time stability are good, anticorrosive, anti-interference, long transmission distance.This invention will effectively promote the understanding to anchorage cable anchoring mechanism, solve the technical matterss such as steady state (SS) evaluation of long-term puzzlement engineering technical personnel's benefit stretch-draw, anchor cable monitoring running state and reinforcing engineering, guarantee the long-term stability and the safety of engineering.
Description of drawings
Fig. 1: be optical fiber grating sensing sensing principle synoptic diagram
Fig. 2: be anchor cable wave zone distributed sensing principle schematic
Fig. 3: be the installation distribution schematic diagram of fiber grating distributed sensor device in anchor cable
Description of reference numerals is as follows in Fig. 3: 1. Φ 0.9mm single-core fiber optical cable 2. Φ 5mm steel strand wires 3. filling protective materials 4. fine steel tubes 5. Transmission Fibers 6. multifiber cables 7. anchor cables that contain the multiple spot distributed fiber grating contain the Φ 0.9mm single-core fiber optical cable of multiple spot distributed fiber grating with fiber grating demodulation device 8. secondary instruments 9.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Fig. 1 is the making and the sensing principle synoptic diagram of optical fiber grating sensing monitoring device.The basic comprising mode of the optical fiber grating sensing monitoring device of anchor cable of the present invention (anchor pole) long-term work state (stress, strain), be to write in the fibre-optical preform that shields with the fiber grating that the anchor cable distortion is complementary, again this fibre-optical preform be stranded in the steel strand wires as wire rope core; Perhaps be embedded on the anchor cable appearance steel strand wires and (utilize two strands of sulculuses between the steel wire, optical fiber is shielded).Particularly, at first to determine the wavelength of its corresponding position each measuring point of fiber grating, thereby determine its input spectrum according to the Strain Distribution situation of anchor cable.And since the caused stress distribution of the distortion of anchor cable and temperature, environment, static state or dynamic load change the accurate a plurality of fiber gratings that distribute of order each distributed points along the line the reflecting light long hair give birth to and change, thereby generate corresponding transmission spectrum and reflectance spectrum, realize real-time follow-up to anchor cable realizing monitoring by the size of surveying its changed wavelength to anchor cable.A perception and transmission system promptly are set, the Changing Pattern of in time exporting the size of its different parts strain and producing in time in anchor cable.
As shown in Figure 2, the accurate a plurality of fiber gratings that distribute are experienced the distribute ess-strain of each point of anchor cable steel hinge line respectively along the line, and its catoptrical wavelength is changed, and the reflected light of change spreads out of from measure field through Transmission Fibers; Survey the size of its changed wavelength by the fiber grating demodulation device, and to the electric signal of converting, calculate the size and the whole anchor cable distribution of the ess-strain of accurate each measuring point that distributes of anchor cable by secondary instrument.
Therefore, the optical fiber grating sensing monitoring method among the present invention is to adopt " quasi-distributed optical fiber grating sensing " technology to come the monitoring that anchor cable is carried out for a long time, stablizes, need not regularly follow the tracks of, and its specific implementation step is:
1) determine the Strain Distribution of anchor cable: according to concrete anchor cable structure and engineering applicable cases, determine (n) and the measurement distribution mode of measurement point, the value of rough estimate each point strain is extrapolated the Strain Distribution overview of whole anchor cable.
2) determine the wavelength of each measuring point place fiber grating: according to the maximal value of the strain of anchor cable rough each point strain distribution state, particularly each point, with the position and the corresponding (λ of the wavelength of the fiber grating of corresponding position of each measuring point
1... .. λ n is designated as down each measuring point label), and guarantee to reach the wavelength value of each measuring point under the peaked limiting case in the each point strain, the Wavelength distribution of each point has certain interval, is generally about Δ λ=0.4～1.2nm.
3) determine the fiber grating demodulation device: the changing value Δ λ of the optic fiber grating wavelength of the corresponding measuring point maximum strain changing value of foundation
1... .. Δ λ n, Wavelength distribution gap size (nx Δ λ) with each point, calculate the wavelength variations value of all measuring points and the summation of spacing value, multiply by corresponding wavelength remaining sum coefficient 1.2～1.8 then, determine the orientation range of required fiber grating demodulation purpose modulation wavelength, and in conjunction with the required measuring accuracy of anchor cable, the fiber grating demodulation device of selected certain model.
4) determine optical fiber grating sensing sensitivity coefficient K: according to fiber grating in the fixing mode of anchor cable steel strand wires (welding, sticking then), distribution mode (external, embedded), selected flexibility ratio values of factor K, and in secondary instrument, be provided with, to protect the size that in secondary instrument, converses various strains.
5) determining of anchor cable integrality: according to the size of each point strain, carry out the computing of specific program, determine that the whole strain regime of anchor cable distributes, and ultimate limit state is reported to the police.
The long-term work state monitoring apparatus of the fiber grating anchor cable among the present invention as shown in Figure 3, it comprises optical fiber cable 1,9, Transmission Fibers 5, filling protective material 3, fine steel tube 4, multifiber cable 6, grating demodulation device 7 and secondary instrument 8 etc.Wherein: form a quasi-distributed fiber grating sensor-based system by a plurality of optical fiber cables 1,9, and link to each other with Transmission Fibers 5, be connected with fiber grating demodulation device 7 by multifiber cable 6,7 of this fiber grating demodulation devices are connected with secondary instrument 8 by data line.
The operation wavelength of described fiber grating demodulation device 7 is 1.30 mu m wavebands or 1.55 mu m wavebands, and the service band scope is greater than 30nm.The linear uniform fiber grating that fiber grating adopts 248nm ultraviolet radiation phase mask plate technique to make, its length is 5mm～12mm, and reflectivity is 90～99%, and reflected waveband is 1310 or the wave band of 1550nm.
The step that is provided with of described monitoring device comprises:
1) design of quasi-distributed fiber grating sensor-based system system
A) according to the mechanical analysis of the anchor cable of anchoring engineering, optimize and definite measuring point number and position, and then the arrangement of definite fiber grating sensing system (external, embedded or external+embedded), embedding mode (pasting or welding).
B) the service band scope of calculating fiber grating demodulation device:
If the sensing grating service band that calculates exceeds the service band scope of detuner, then can redesign fiber grating distributed sensor system, employing multi-channel optical fibre grating sensing system reduces the service band area requirement to the fiber grating demodulation device.
C) light loss is calculated.According to pad, interface, the shunt number of whole optical path, calculate the light intensity loss of whole optical path, be not less than the I emission * 3% of emission light intensity to guarantee each optical grating reflection light intensity.
2) preparation of fiber grating sensing system
A) according to the wavelength X of each point
i, prepare fiber grating, it prepares grating reflection wavelength change amount, can not exceed Δ λ * 35%.
B) calculating of the surplus length of calculating optical fiber cable 1,9
For guarantee optical fiber cable 1,9 in the anchor cable can be in anchor cable distortion fracture, then the length overall l of the transmission cable in the anchor cable
Light=l
Anchor cable/ cos θ, l
Anchor cableBe the straight line active length of fiber grating sensing system in anchor cable, θ is twisting inclination angle [theta]=2～5 ℃ of steel wire in the anchor cable.
C) welding, protection, the encapsulation of optical fiber cable 1,9 and transmission cable (optical fiber) 5
At first carry out the encapsulation of fiber grating and may guarantee that the used grating of total system encapsulates at same batch; guarantee the consistance of its sensing; carry out the welding of fiber grating and transmission cable by the optical fiber automatic welding machine; guarantee that the two is the optical fiber of model of the same race; the welding loss is less than 1%; in addition; also want butt welding point to apply protection again: wherein the grating place of embedded sensor-based system adopts φ 0.5nm steel pipe 4 protection sensor fibres, and the grating place of external sensor-based system then adopts φ 0.9nm single fiber cable to protect.
3) optical fiber cable (1,9) is gone up the stickup or the welding of fiber grating
A) can adopt laser microwelding technology to weld for the fiber grating on the optical fiber cable (1,9) of φ 0.5nm steel pipe encapsulation, 1,9 of optical fiber cables for adhesive type adopt quick curing adhesive to paste, in above-mentioned two kinds of technologies, guarantee welding and stickup under the same process condition, particularly to guarantee the fiber grating welding on the optical fiber cable (1,9) or paste after linearly, and in solidification process, apply identical prestress.
B) determine the sensitivity coefficient K of fiber grating
Adopt identical technology, grating grating welding (or stickup) is installed on the test cable, it is stressed to stretch, and determines sensitivity coefficient K.
C) fiber grating on the optical fiber cable (1,9) of distributed fiber grating sensor-based system is pasted (welding) on the steel wire 2 of anchor cable steel hinge line; on whole sensor-based system, apply 704 glue or the HP plastics of protection then, and insert the single core transmission cable of Φ 2.5mm transmission cable 5.Draw anchor cable by the bleeder vent on the anchor cup, insert multifiber cable 6 again, this multifiber cable 6 is monitored indoor fiber Bragg grating (FBG) demodulator 7 with the distant place again and is connected with secondary instrument 8.
4) debugging of system:
After total system installed, carry out related commissioning, inspection.
A) check at first whether whole optical path communicates.
B) adopt the mode that heats, the position of check measurement each point is corresponding with the wavelength of grating.
C) the cable wire method is knocked in employing, and whether the grating of check measurement each point is pasted or firm welding.
The optical fiber grating sensing monitoring device of the anchor cable among the present invention (anchor pole) long-term work state (stress, strain), be mainly used in the steady state (SS) evaluation of anchor cable status monitoring and this reinforcing engineering, it directly imbeds anchor cable with fiber-optic grating sensor, carry out the online omnidistance signals collecting of anchor cable state, adopt multiple multiplex technique that light signal is directly transmitted again.Analyze from system of the present invention composition and function, it can overcome the shortcoming of traditional monitoring means to the anchor cable monitoring, be particularly suitable for the real-time follow-up of the internal stress distribution of anchor cable and the stress distribution variation that temperature, environment, static state or dynamic load cause, help the safety monitoring and the globality evaluation of anchor cable, have important social benefit and economic benefit, particularly have more utmost point special significance in China.
Claims (10)
1, a kind of monitoring method of fiber grating anchor cable long-term work state is characterized in that: 1) go into the optical fiber grating in that monitored anchor cable is mid-; 2) the accurate a plurality of fiber gratings that distribute are experienced the distribute ess-strain of each point of anchor cable steel hinge line respectively along the line, and its catoptrical wavelength is changed, and the reflected light of change spreads out of from measure field through Transmission Fibers; 3) survey the size of its changed wavelength by the fiber grating demodulation device, and to the electric signal of converting, deliver to secondary instrument; 4) calculate the size and the whole anchor cable distribution of the ess-strain of accurate each measuring point that distributes of anchor cable by secondary instrument.
2, method according to claim 1 is characterized in that: its specific implementation step is:
1) determine the Strain Distribution of anchor cable: according to concrete anchor cable structure and engineering applicable cases, determine measurement point (n) and measurement distribution mode, the value of rough estimate each point strain is extrapolated the Strain Distribution overview of whole anchor cable;
2) determine the wavelength of each measuring point place fiber grating: according to the maximal value of the strain of rough anchor cable each point strain distribution state, particularly each point, with the position and the corresponding (λ of the wavelength of the fiber grating of corresponding position of each measuring point
1... .. λ n is designated as down each measuring point label), and guarantee to reach the wavelength value of each measuring point under the peaked limiting case in the each point strain, the Wavelength distribution of each point has certain interval, is generally about Δ λ=0.4～1.2nm;
3) will insert in the anchor cable that each root need monitor by the fiber grating that step 2 is determined;
4) determine the fiber grating demodulation device: the changing value Δ λ of the optic fiber grating wavelength of the corresponding measuring point maximum strain changing value of foundation
1... .. Δ λ n, Wavelength distribution gap size (nx Δ λ) with each point, calculate the wavelength variations value of all measuring points and the summation of spacing value, multiply by corresponding wavelength remaining sum coefficient 1.2～1.8 then, determine the modulation wavelength scope of required fiber grating demodulation device, and in conjunction with the required measuring accuracy of anchor cable, selected corresponding fiber grating demodulation device;
5) determine optical fiber grating sensing sensitivity coefficient K: according to fiber grating in the fixing mode of anchor cable steel strand wires (welding, paste), distribution mode (external, embedded), selected sensitivity coefficient K value, and in secondary instrument, be provided with, so that in secondary instrument, converse the size of various strains;
6) determining of anchor cable integrality: according to the size of each point strain, carry out computing, determine that the whole strain regime of anchor cable distributes, and ultimate limit state is reported to the police.
3, a kind of monitoring device of fiber grating anchor cable long-term work state, it is characterized in that: it comprises fiber grating, Transmission Fibers, fiber grating demodulation device and the secondary instrument of the multiple spot distribution of inserting in the monitored anchor cable, wherein, form a quasi-distributed fiber grating sensor-based system by a plurality of fiber gratings, and link to each other with Transmission Fibers, and be connected with the fiber grating demodulation device by Transmission Fibers, the fiber grating demodulation device is connected with secondary instrument by data line.
4, the monitoring device of fiber grating anchor cable long-term work state according to claim 3, it is characterized in that: described quasi-distributed fiber grating sensor-based system is the 0.9mm single-core fiber optical cable (1 that contains the distributed fiber grating of multiple spot, 9), this optical fiber cable (1,9) fiber grating on is pasted respectively or is welded in the steel wire (2) of anchor cable steel hinge line or be outer, this optical fiber cable is drawn anchor cable by the bleeder vent on the anchor cup, insert multifiber cable (6), this multifiber cable (6) is monitored indoor fiber Bragg grating (FBG) demodulator (7) with the distant place and is connected with secondary instrument (8).
5, the monitoring device of fiber grating anchor cable long-term work state according to claim 4 is characterized in that: described single-core fiber optical cable (1,9) length overall should satisfy l
Light=l
Anchor cable/ cos θ, wherein: 1
Anchor cableBe the straight line active length of fiber grating sensing system in anchor cable, θ is the twisting inclination angle of steel wire in the anchor cable, θ=2～5 ℃.
6, according to the monitoring device of claim 3 or 4 described fiber grating anchor cable long-term work states, it is characterized in that: described fiber grating is to adopt the normal temperature technology for applying, laser microwelding technology is pasted or is welded on Steel Wire Surface or in the sulculus that steel wire presets.
7, the monitoring device of fiber grating anchor cable long-term work state according to claim 4; it is characterized in that: described transmission cable (5) is the optical fiber of model of the same race with described optical fiber cable (1,9); and be installed in the protection sleeve or directly adopt single fiber cable; fiber grating welding and encapsulation on described transmission cable (5) and the described optical fiber cable (1,9) should guarantee that it carries out at same batch, and the welding loss should be less than 1%., and each solder joint on the optical fiber applied protection again.
8, the monitoring device of fiber grating anchor cable long-term work state according to claim 7; it is characterized in that: locate to adopt the steel pipe (4) of φ 0.5nm to protect sensor fibre at the optical fiber cable (9) of described embedded sensor-based system, locate to adopt φ 0.9nm single fiber cable to protect at the optical fiber cable (9) of described external sensor-based system.
9, the monitoring device of fiber grating anchor cable long-term work state according to claim 8, it is characterized in that: the fiber grating for φ 0.5nm steel pipe encapsulation can adopt laser microwelding technology to weld, and then adopts quick curing adhesive to paste for the fiber grating of adhesive type.
10, the monitoring device of fiber grating anchor cable long-term work state according to claim 3, it is characterized in that: the operation wavelength of described fiber grating demodulation device (7) is 1.30 mu m wavebands or 1.55 mu m wavebands, service band length is greater than 30nm, the linear uniform fiber grating that described fiber grating adopts 248nm ultraviolet radiation phase mask plate technique to make, its length is 5mm～12mm, reflectivity is 90～99%, and reflected waveband is 1310 or the wave band of 1550nm.
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| CNB021389802A CN1166921C (en) | 2002-08-29 | 2002-08-29 | Monitoring method of long-period working state of optical fibre grating anchor wire and its equipment |
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|---|---|---|---|
| CNB021389802A CN1166921C (en) | 2002-08-29 | 2002-08-29 | Monitoring method of long-period working state of optical fibre grating anchor wire and its equipment |
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| CN1166921C CN1166921C (en) | 2004-09-15 |
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