CN103353367A - Rock and soil reinforcement bar outer end force sensor based on fiber bragg grating - Google Patents
Rock and soil reinforcement bar outer end force sensor based on fiber bragg grating Download PDFInfo
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- CN103353367A CN103353367A CN2013102936416A CN201310293641A CN103353367A CN 103353367 A CN103353367 A CN 103353367A CN 2013102936416 A CN2013102936416 A CN 2013102936416A CN 201310293641 A CN201310293641 A CN 201310293641A CN 103353367 A CN103353367 A CN 103353367A
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Abstract
The invention relates to a rock and soil reinforcement bar outer end force sensor based on a fiber bragg grating. The sensor is formed by an internal fiber bragg grating force sensing device and an external data acquisition and wireless transmission apparatus. The sensor has the following advantages that only two times of parametric conversions of force-light wave-force are needed; an error is easy to be controlled and there is no requirement to insulation; the structure is simple and a manufacturing technology is simple too; monitoring precision is high, stability and an effective utilization rate are high too; an installation method is the same with the method of fixing the common reinforcement bar outer end and operation is convenient; the sensor has a significant science meaning and an actual application value for acquiring a change rule of a rock-soil body and diagnosing and controlling an engineering risk in an early stage.
Description
Technical field
The invention belongs to Geotechnical Engineering monitoring instrument field, be particularly related to a kind of rock-reinforcing rod member outer end force cell based on fiber grating, the long-range real-time online that is applicable to the stressed variations of engineering reinforcement rod member such as Rock And Soil internal stress, change in displacement and anchor cable, anchor pole, soil nailing measures.
Background technology
Rock And Soil stress, deformation monitoring are to estimate Rock And Soil and building stability state or buildings whether can normally use the most direct index source means; Wherein, the Rock And Soil interior change will be early than its surface modification generally speaking, therefore, carries out focus and the focus that its internal stress, change in displacement monitoring become academia and the common concern of engineering circles gradually by the engineering reinforcement rod member of implanting Rock And Soil inside.At present, mainly be to be combined the rock-reinforcing rod member with Fibre Optical Sensor by vibrating string type sensor to monitor.The former is by vibrating string type sensor being installed in the ground reinforcing rod spare stiff ends such as anchor cable, anchor pole, soil nailing, can reaching its stiff end after rod member is stressed, and then affect the vibrating string type sensor stress; The sensor internal vibratory string changes in stressed rear amount of deflection, and then the natural frequency of string also changes, the electromagnetic induction of its generation of vibration changes under the exciting effect, it is the voltage parameter change on the ammeter, convert at last the mechanics parameter to, this process " power-amount of deflection-exciting-frequency-electromagnetic induction-voltage-Li " has experienced at least six parameter conversions, so that the method easily is disturbed, error control and precision improvement difficulty, its insulating requirements is high, is difficult to adapt to the high precision monitor of complicated Rock Conditions.The latter is by fiber-optic grating sensor vertically is attached on the rod member deformation of measurement rod member various piece under the Rock And Soil effect, thereby the variation of judgement Rock And Soil along reinforcing rod member; But the method requires very high to the packaging protection of fiber-optic grating sensor, makes comparatively difficulty, and the installation of sensor can change the cross-sectional area of rod member, causes monitoring error; Simultaneously, because the fragility of optical fiber, rod member is implanted the also comparatively difficult of Rock And Soil, and technological requirement is very high; After said two devices often caused its rod member to implant Rock And Soil, the sensor availability was low, error control difficulty, and replacement cost is high, is difficult to promote the use of.Therefore, a kind of rock-reinforcing rod member outer end force cell based on fiber grating of development and design, solve the problem of the high-precision sensor shortcoming that measures the Rock And Soil interior change, for the early diagnosis of obtaining Rock And Soil Changing Pattern, engineering risk and control, very important scientific meaning and actual application value are arranged.
Summary of the invention
Order of the present invention is, for existing Rock And Soil internal stress, change in displacement monitoring sensor error control difficulty, the problem such as technological requirement is high, precision improvement is difficult, provide a kind of parameter conversion less, error is easy to control, making and the mounting process requirement is low, precision is high Rock And Soil interior change monitoring sensor.
A kind of rock-reinforcing rod member outer end force cell based on fiber grating that the present invention relates to is comprised of the stressed sensing device of internal optical fiber grating and external data collection, radio transmitting device.
1, the stressed sensing device of internal optical fiber grating
The stressed sensing device of internal optical fiber grating is comprised of three or four fiber-optic grating sensors, stressed films and encapsulation reinforcing rings etc., only needing can to realize twice parameter conversion of power-light wave-Li can the high precision perception by the Rock And Soil interior change situation of reinforcing rod member and transmitting.
2, external data collection, radio transmitting device
External data collection, radio transmitting device are comprised of data acquisition and wireless launcher thereof, data wireless receiving trap, optical cable etc., can realize certainly collection, mechanics parameter conversion, energy source self-collecting, the long-range real-time Transmission of Fibre Optical Sensor data.
The present invention has the following advantages:
Only need twice parameter conversion of power-light wave-Li, error is easy to control, to the insulation no requirement (NR); Simple in structure, manufacture craft is simple; Monitoring accuracy is high, and stability is high, and availability is high; Installation method and common reinforcing rod member outer end be indistinction fixedly, and be easy to operate, do not have very strong technical requirement to installing with the monitoring personnel.
Description of drawings
Fig. 1 is the whole structural representation that forms of the present invention, and Fig. 2 is the stressed sensing device structural representation of internal optical fiber grating, and Fig. 3 is the stressed effect synoptic diagram of fiber grating.
Wherein:
A. the stressed sensing device of internal optical fiber grating: A1. fiber-optic grating sensor; A2. stressed film; A3. encapsulate reinforcing ring; A4. optical cable outlet; A5. optical cable.
B. external data collection, radio transmitting device: B1. data acquisition and wireless launcher thereof; B2. data wireless receiving trap; B3. optical cable.
C. rock-reinforcing rod member.
D. pad.
E. bolt.
Fig. 4 specifically tests the embodiment process flow diagram.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is further specified:
1. the stressed sensing device of internal optical fiber grating
Three or four A1. fiber-optic grating sensors and the stressed film of A2. place A3. encapsulation reinforcing ring, expendable mo(u)ld machine-shaping, and at the surface spraying anti-corrosion material; The A5. optical cable that connects the A1. fiber-optic grating sensor is drawn by the outlet of A4. optical cable.In the observation process, the stressed sensing device of A. internal optical fiber grating is bolted to C. rock-reinforcing rod member outer end by D. pad and E., as required the D. pad is applied prestress; When C. rock-reinforcing rod member is subject to External Force Acting because of the Rock And Soil interior change, and will reach its outer end so that put on the D. pad, A3. encapsulates reinforcing ring; A3. encapsulate reinforcing ring the power effect is reached the stressed film of A2., the stressed film of A2. reaches the A1. fiber-optic grating sensor with the power effect, causes the A1. fiber-optic grating sensor to produce strain; Strain causes the grating of A1. fiber-optic grating sensor to produce dependent variable, and then changes wavelength; Changed wavelength is transmitted to B1. data acquisition and wireless launcher thereof through the A5. optical cable, and the demarcation relation according to changed wavelength, grating strain amount and power effect can read the stressed delta data of C. rock-reinforcing rod member; On this basis, in conjunction with C. rock-reinforcing rod member and Rock And Soil interactively, can obtain Rock And Soil interior change data, thereby finish the measurement of Rock And Soil interior change situation.
2. external data collection, radio transmitting device
B1. data acquisition and wireless launcher thereof are placed and place suitable and that be easy to protect as required.In the observation process, B1. data acquisition and wireless launcher thereof gather the changed wavelength of A1. fiber-optic grating sensor conduction by A5. optical cable and B3. optical cable, according to the demarcation relation of changed wavelength, grating strain amount and power effect, obtain the stressed delta data of C. rock-reinforcing rod member; By Radio Transmission Technology, the stressed delta data of C. rock-reinforcing rod member is passed to B2. data wireless receiving trap; On this basis, in conjunction with C. rock-reinforcing rod member and Rock And Soil interactively, can obtain Rock And Soil interior change data, realize long-range real-time Transmission and the analysis of Rock And Soil interior change condition monitoring data, catch in real time Rock And Soil interior change rule.
3. on the basis of said system, based on laddering collision detection with clear up technology, to the integrated and Intelligent Optimal Design that carries out of above-mentioned two hardware; Introduce collaborative design thought, develop the intelligent control module of whole sensor, realize the remote intelligent control of monitoring frequency, data layout, energy resource collecting pattern, form a whole set of based on the rock-reinforcing rod member outer end force cell of fiber grating.
Claims (1)
1. the rock-reinforcing rod member outer end force cell based on fiber grating comprises that the stressed sensing device of internal optical fiber grating and external data collection, radio transmitting device form.It is characterized in that: the stressed sensing device of described internal optical fiber grating is comprised of three or four fiber-optic grating sensors, stressed films and encapsulation reinforcing rings etc., only needing can to realize twice parameter conversion of power-light wave-Li can the high precision perception by the Rock And Soil interior change situation of reinforcing rod member and transmitting; Described external data collection, radio transmitting device are comprised of data acquisition and wireless launcher thereof, data wireless receiving trap, optical cable etc., can realize certainly collection, mechanics parameter conversion, energy source self-collecting, the long-range real-time Transmission of Fibre Optical Sensor data.This sensor only needing can realize twice parameter conversion of power-light wave-Li to get final product the perception of the high-precision low error of long-range real-time online by the Rock And Soil interior change rule of reinforcing the rod member transmission.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310293641.6A CN103353367B (en) | 2013-07-04 | 2013-07-04 | A kind of rock-reinforcing rod member outer end based on fiber grating force cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310293641.6A CN103353367B (en) | 2013-07-04 | 2013-07-04 | A kind of rock-reinforcing rod member outer end based on fiber grating force cell |
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| CN103353367A true CN103353367A (en) | 2013-10-16 |
| CN103353367B CN103353367B (en) | 2016-10-26 |
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Cited By (6)
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| CN105547541A (en) * | 2016-01-05 | 2016-05-04 | 太原理工大学 | Unidirectional force monitoring apparatus and monitoring method |
| CN105806526A (en) * | 2016-04-29 | 2016-07-27 | 重庆大学 | Quantum dot stress gage |
| CN105928645A (en) * | 2016-04-29 | 2016-09-07 | 重庆大学 | Three-directional stressometer based on quantum dots |
| CN105953957A (en) * | 2016-04-29 | 2016-09-21 | 重庆大学 | Dodecahedral three-dimensional stress gage based on quantum dots |
| CN107631823A (en) * | 2017-09-30 | 2018-01-26 | 青岛理工大学 | A kind of total length bonds reinforced anchor bolt body of rod surface shear stress test device |
| CN113899631A (en) * | 2021-10-25 | 2022-01-07 | 中煤科工开采研究院有限公司 | System and method for testing performance of anchored rock mass |
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| CN105806526A (en) * | 2016-04-29 | 2016-07-27 | 重庆大学 | Quantum dot stress gage |
| CN105928645A (en) * | 2016-04-29 | 2016-09-07 | 重庆大学 | Three-directional stressometer based on quantum dots |
| CN105953957A (en) * | 2016-04-29 | 2016-09-21 | 重庆大学 | Dodecahedral three-dimensional stress gage based on quantum dots |
| CN107631823A (en) * | 2017-09-30 | 2018-01-26 | 青岛理工大学 | A kind of total length bonds reinforced anchor bolt body of rod surface shear stress test device |
| CN113899631A (en) * | 2021-10-25 | 2022-01-07 | 中煤科工开采研究院有限公司 | System and method for testing performance of anchored rock mass |
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| CN103353367B (en) | 2016-10-26 |
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