CN103017674A - Cantilever pier scour monitoring device based on fiber Bragg grating sensors - Google Patents
Cantilever pier scour monitoring device based on fiber Bragg grating sensors Download PDFInfo
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- CN103017674A CN103017674A CN2012105662339A CN201210566233A CN103017674A CN 103017674 A CN103017674 A CN 103017674A CN 2012105662339 A CN2012105662339 A CN 2012105662339A CN 201210566233 A CN201210566233 A CN 201210566233A CN 103017674 A CN103017674 A CN 103017674A
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Abstract
The invention discloses a cantilever pier scour monitoring device based on fiber Bragg grating sensors. The cantilever pier scour monitoring device comprises at least two monitoring units, optical fiber and a sensor data collector. Each monitoring unit comprises a hollow sleeve, a bottom plate, a steel plate and a fiber Bragg grating sensor, wherein the hollow sleeve is fixedly connected at the top of the bottom plate, opposite through holes are arranged on opposite two side walls of the hollow sleeve, the steel plate is located in the hollow sleeve, the bottom end of the steel plate is fixedly connected at the top of the bottom plate, the fiber Bragg grating sensor is adhered to the surface of the steel plate through a resin layer, the resin layer covers the outer surface of the fiber Bragg grating sensor, and the fiber Bragg grating sensor faces the through holes of the hollow sleeve. The monitoring units are axially distributed along the hollow sleeve and are connected to the sensor data collector. The monitoring device can monitor whole process of scouring and backfilling in real time for a long term, and monitoring data are accurate.
Description
Technical field
The present invention relates to a kind of bridge pier flushing monitoring device, specifically, relate to a kind of cantilevered bridge pier flushing monitoring device based on Bragg grating sensor.This monitoring device is that a kind of long-term Real-Time Monitoring of possessing of flood prone areas, overall process of being applicable to washes away backfill record and the better novel bridge pier flushing monitoring device of endurance quality.
Background technology
The disease of washing away of bridge foundation structure is current bridge structure disabler, loses one of main reason of its security performance.Take the U.S. as example, from 1966 to 2005, the whole America collapse (1502) 58% in the bridge destroy a bridge with the bridge foundation structure to wash away disease relevant, one of common cause that DOT has regarded bridge foundation washout as that Assessment of Highway Bridge Structures function and security performance lost efficacy.According to U.S. Traffic Safety Committee statistics, annual be used for repairing and remedy suffer foundation scouring disease bridge expense on average up to 30,000,000 dollars.
China also occurs causing the structural collapse phenomenon because of bridge foundation washout in the recent period again and again.For example, the logical Ji of the Hua Yangshi of Sichuan Province bridge in 2010 is emptied the bridge pier substrate because of flood and is directly caused a bridge pier and the life of adjacent bridge roach to be collapsed; West, Tieli City, Heilongjiang Province in 2009 bridge is washed away to come to nothing by water because of No. 3 pier substrate parts the pontic collapse accident occurs.In fact, the landlocked rivers and lakes of China are abundant and the shore line is vast simultaneously, exist and stride in a large number river crossing bridge and bay bridge, during flood or hurricane, all may be subject to frequently flood effect and cause serious foundation scouring disease, owing to washing away and betiding below the water surface, bridge foundation is washed destruction usually without any sign, seriously jeopardizes the security performance of bridge structure and the smooth operation of traffic highway network.
Obviously, the bridge foundation washout degree of depth being carried out accurately monitoring on the spot is the important channel of avoiding the bridge foundation washout disaster to occur.In fact, developed at present multiple bridge pier flushing monitoring device (for example based on radar, sonar technique), but all be difficult to realize effectively long-term Real-Time Monitoring, monitoring easily be subject to the inclement weather impact period and the permanance of monitoring device own not high, more can't observe to wash away and comprise the whole overall process of washing away the backfill of rear riverbed, and easily disturbed by foreign material in the river, unstable result, between overflow stage, also can't implement in addition monitoring, therefore multiplexly use in provisional flushing monitoring, can't collect that long term monitoring data is followed the tracks of the bridge pier scour depth and rationally anticipation.
Summary of the invention
Technical matters: technical matters to be solved by this invention is: a kind of cantilevered bridge pier flushing monitoring device based on Bragg grating sensor is provided, and this monitoring device for a long time Real-Time Monitoring washes away the backfill overall process, and Monitoring Data is accurate.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of cantilevered bridge pier flushing monitoring device based on Bragg grating sensor, this monitoring device comprises at least two monitoring means, optical fiber, the sensor data collection device, described each monitoring means comprises hollow sleeve, base plate, steel plate, Bragg grating sensor, hollow sleeve is fixedly connected on the end face of base plate, and the two side walls that hollow sleeve is relative is provided with relative groove, steel plate is arranged in hollow sleeve, and the bottom of steel plate is fixedly connected on the end face of base plate, Bragg grating sensor is bonded in the surface of steel plate by resin bed, and resin bed covers the outside surface of Bragg grating sensor, and Bragg grating sensor is towards the groove of hollow sleeve; Monitoring means is axial arranged along hollow sleeve, and connects by base plate between the adjacent monitoring means; Bragg grating sensor is connected in series by an optical fiber, and is connected to the sensor data collection device.
Further, described each monitoring means also comprises a pair of backplate, and the bottom of backplate is fixedly connected on the steel plate, and resin bed is between this is to backplate, and the height of backplate is greater than the height of resin bed.
Further, described cantilevered bridge pier flushing monitoring device based on Bragg grating sensor also comprises reinforcing rod, and this reinforcing rod is fixedly connected on the both sides of hollow sleeve groove.
Further, described each monitoring means comprises at least two Bragg grating sensors, and the distance between the adjacent Bragg grating sensor is 10-35 centimetres.
Beneficial effect: compared with prior art, technical scheme of the present invention has following beneficial effect:
(1) Real-Time Monitoring washes away the backfill overall process for a long time, and Monitoring Data is accurate.Monitoring device of the present invention, the purpose of Real-Time Monitoring bridge pier scour depth is come in the position of the Bragg grating sensor by constantly exposing the riverbed.Can realize that like this long term monitoring washes away, comprise the whole overall process of riverbed backfill.Simultaneously, monitoring device of the present invention utilizes the simple optical fiber line that all Bragg grating sensors are connected in series, and utilizes Bragg grating sensor to obtain and transmission of information, can improve the Stability and veracity of data.
(2) long service life, monitoring periods is long, and monitoring is not subjected to external environment influence.Monitoring device of the present invention comprises backplate, and backplate is fixedly connected on the steel plate, and resin bed is between this is to backplate, and the height of backplate is greater than the height of resin bed.Backplate is set, can avoids foreign material in the water to the destruction of resin bed, and then protection Bragg grating sensor and optical fiber, that guarantees to monitor normally carries out.In addition, use resin bed cementing agent parcel optical fiber and Bragg grating sensor, not damaged to protect it.Simultaneously, at the groove of hollow sleeve the several bars bar is set, can prevents directly that large foreign material, stone, floating ice etc. from entering hollow sleeve inside, affect steel plate bending distortion so that Bragg grating sensor error in reading.So just guaranteed that monitoring device of the present invention (as between overflow stage) monitoring under the extreme weather state is unaffected.By a large amount of long term monitoring data that this monitoring device obtains, can be used to carry out the prediction of the development trend of bridge pier scour depth.It is main monitoring equipment that monitoring device adopts Bragg grating sensor and optical fiber, and there is not endurance issues in material itself, has long service life, the advantage that monitoring periods is long, and possess the technical advantage of long distance, multiple spot series connection, anti-electromagnetic interference (EMI).
(3) apparatus structure is ingenious.The present invention can adopt division system standby, the installation form of joint connection in site.According to actual needs, connect a plurality of monitoring means, connect by base plate between the adjacent monitoring means, and share an optical fiber.Complete monitoring subsystem is arranged in each monitoring means, namely independently be fixed on the steel plate on the base plate, then by the optical fiber grafting technique, a plurality of hollow sleeves are connected, be about to a plurality of monitoring subsystems and connect into complete monitoring system, form at last whole.Also can segmented hollow sleeve be squeezed into below the riverbed at the scene, hollow sleeve is squeezed into the optical fiber interconnection technique and is carried out simultaneously, greatly reduces and squeezes in the process, to the probability of damage of monitoring device.
Description of drawings
Fig. 1 is vertical view of the present invention.
Fig. 2 is the A-A cut-open view among Fig. 1.
Fig. 3 is left view of the present invention.
Fig. 4 is the partial enlarged drawing of monitoring means among the present invention.
Fig. 5 is working morphology schematic diagram of the present invention, and wherein, dotted line represents to be subjected to the diastrophic steel plate of flow action.
Fig. 6 is the initial position schematic diagram of the present invention in observation process.
Fig. 7 is that the present invention experiences one section position view behind the flushing time in observation process.
Have among the figure: hollow sleeve 1, steel plate 2, backplate 3, Bragg grating sensor 4, optical fiber 5, base plate 6, resin bed 7, riverbed 8, sensor data collection device 9.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figures 1 to 4, a kind of cantilevered bridge pier flushing monitoring device based on Bragg grating sensor of the present invention comprises at least two monitoring means, optical fiber 5 and sensor data collection device 9.Each monitoring means comprises hollow sleeve 1, base plate 6, steel plate 2, Bragg grating sensor 4.The thickness of steel plate 2 determines with measured basin water Flow Velocity and the depth of water, produces obvious flexural deformation to guarantee certain flow action lower steel plate 2.Hollow sleeve 1 is fixedly connected on the end face of base plate 6, and hollow sleeve 1 relative two side walls is provided with relative groove.Groove is opened in these hollow sleeve 1 relative both sides, can guarantee that current are smoothly by this hollow sleeve 1.Steel plate 2 is arranged in hollow sleeve 1, and the bottom of steel plate 2 is fixedly connected on the end face of base plate 6.Bragg grating sensor 4 is bonded in the surface of steel plate 2 by resin bed 7, and resin bed 7 covers the outside surface of Bragg grating sensor 4.Bragg grating sensor 4 is towards the groove of hollow sleeve 1.Monitoring means is axial arranged along hollow sleeve 1.Be that monitoring means is arranged from the top down successively.Connect by base plate 6 between the adjacent monitoring means.That is to say, the top that is positioned at the monitoring means of below is fixedly connected on the base plate 6 of the monitoring means that is positioned at the top.Bragg grating sensor 4 is connected in series by an optical fiber 5, and is connected to sensor data collection device 9.Optical fiber 5 is positioned at resin bed 7.
Further, described each monitoring means also comprises a pair of backplate 3, and the bottom of backplate 3 is fixedly connected on the steel plate 2, and resin bed 7 is between this is to backplate 3, and the height of backplate 3 is greater than the height of resin bed 7.Backplate 3 is set, can avoids foreign material in the water to the destruction of resin bed 7, and then protection Bragg grating sensor 4 and optical fiber 5, that guarantees to monitor normally carries out.
Further, described cantilevered bridge pier flushing monitoring device based on Bragg grating sensor also comprises reinforcing rod, and reinforcing rod is fixedly connected on the both sides of hollow sleeve 1 groove.This reinforcing rod is at least two, and transverse horizontal evenly arranges.Reinforcing rod is set; can prevent that large foreign material, stone, floating ice etc. from entering in the hollow sleeve 1 on the one hand; affect steel plate 2 flexural deformations, so that Bragg grating sensor 4 errors in reading, can be used on the other hand protecting Bragg grating sensor 4 and optical fiber 5 not to be damaged by the current foreign material.
Further, described cantilevered bridge pier flushing monitoring device based on Bragg grating sensor comprises also also comprising rubber sheath that this rubber sheath is sleeved on the outside surface of optical fiber 5.Rubber sheath is set protects optical fiber 5, prevent that optical fiber 5 from damaging.
Further, described each monitoring means comprises at least two Bragg grating sensors 4, and the distance between the adjacent Bragg grating sensor 4 is 10-35 centimetres, for example can be 10 centimetres, 14 centimetres, 20 centimetres, 28 centimetres, perhaps 35 centimetres.A plurality of Bragg grating sensors 4 are set in each monitoring means, can improve the accuracy of measurement.
In the above-mentioned cantilevered bridge pier flushing monitoring device: utilize optical fiber 5 with Bragg grating sensor 4 series connection, and use resin bed 7 that it is bonded on the steel plate 2.Steel plate 2 is fixedly connected on the base plate 6 with the semi-girder form.Backplate 3 is set on the steel plate 2, and in the hollow sleeve 1 reinforcing rod is set, do not damaged by the current foreign material for the protection of Bragg grating sensor 4 and optical fiber 5.
The principle of work of above-mentioned cantilevered bridge pier flushing monitoring device is: with bridge pier scour depth development, the steel plate 2 of imbedding riverbed 8 can issue looks at flow action and answer flexural deformation, steel plate 2 such as dotted lines among Fig. 5, the Bragg grating sensor 4 that is bonded on the steel plate 2 can constantly expose 8 surfaces, riverbed, and is produced reading by flow force or water flow impact pressure excitation.For instance, as shown in Figure 6 and Figure 7, Fig. 6 is the initial position schematic diagram of the present invention in observation process, and Fig. 7 is that the present invention experiences one section position view behind the flushing time in observation process.As can be seen from Figures 6 and 7: along with current scour, originally be embedded in the Bragg grating sensor 4 in the riverbed 8, and gradually exposed 8 surfaces, riverbed.The present invention acts on Bragg grating sensor 4 with a kind of form of external drive, makes it produce response (optical wavelength changes), utilizes at last sensor data collection device 9 to read the data of Bragg grating sensor.The scour depth of the bridge pier of monitoring location is accurately judged in the position of the Bragg grating sensor 4 by defining reading, and reading magnitude relationship between a plurality of Bragg grating sensor 4.
The installation process of above-mentioned cantilevered bridge pier flushing monitoring device is: at first, the preparation monitoring means: the Bragg grating sensor 4 that will be connected with optical fiber 5 is bonded in the surface of steel plate 2 by resin bed 7, backplate 3 is connected on the steel plate 2, and backplate 3 is positioned at the both sides of resin bed 7, steel plate 2 and hollow sleeve 1 is fixedly connected sequentially on base plate 6 again; Then, at the scene of implementing, length is in aggregates by base plate 6 connections with a plurality of monitoring means on demand, and optical fiber 5 is connected on the sensor data collection device 9, and this sensor data collection device 9 can adopt Radio Transmission Technology; At last, will be all-in-one-piece monitoring means squeezes near the bridge pier that needs monitorings washes away the position the riverbed 8.
Claims (6)
1. cantilevered bridge pier flushing monitoring device based on Bragg grating sensor, it is characterized in that, this monitoring device comprises at least two monitoring means, optical fiber (5), sensor data collection device (7), described each monitoring means comprises hollow sleeve (1), base plate (6), steel plate (2), Bragg grating sensor (4), hollow sleeve (1) is fixedly connected on the end face of base plate (6), and the relative two side walls of hollow sleeve (1) is provided with relative groove, steel plate (2) is arranged in hollow sleeve (1), and the bottom of steel plate (2) is fixedly connected on the end face of base plate (6), Bragg grating sensor (4) is bonded in the surface of steel plate (2) by resin bed (7), and resin bed (7) covers the outside surface of Bragg grating sensor (4), and Bragg grating sensor (4) is towards the groove of hollow sleeve (1);
Monitoring means is axial arranged along hollow sleeve (1), and connects by base plate (6) between the adjacent monitoring means; Bragg grating sensor (4) is connected in series by an optical fiber (5), and is connected to sensor data collection device (7).
2. the cantilevered bridge pier flushing monitoring device based on Bragg grating sensor according to claim 1, it is characterized in that, described each monitoring means also comprises a pair of backplate (3), the bottom of backplate (3) is fixedly connected on the steel plate (2), resin bed (7) is positioned at this between the backplate (3), and the height of backplate (3) is greater than the height of resin bed (7).
3. the cantilevered bridge pier flushing monitoring device based on Bragg grating sensor according to claim 1 is characterized in that, also comprise reinforcing rod, this reinforcing rod is fixedly connected on the both sides of hollow sleeve (1) groove.
4. the cantilevered bridge pier flushing monitoring device based on Bragg grating sensor according to claim 3 is characterized in that, described reinforcing rod is at least two, and transverse horizontal evenly arranges.
5. the cantilevered bridge pier flushing monitoring device based on Bragg grating sensor according to claim 1 is characterized in that, also comprise rubber sheath, this rubber sheath is sleeved on the outside surface of optical fiber (5).
6. any one described cantilevered bridge pier flushing monitoring device based on Bragg grating sensor in 5 according to claim 1, it is characterized in that, described each monitoring means comprises at least two Bragg grating sensors (4), and the distance between the adjacent Bragg grating sensor (4) is 10-35 centimetres.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105662339A CN103017674A (en) | 2012-12-24 | 2012-12-24 | Cantilever pier scour monitoring device based on fiber Bragg grating sensors |
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| CN2012105662339A CN103017674A (en) | 2012-12-24 | 2012-12-24 | Cantilever pier scour monitoring device based on fiber Bragg grating sensors |
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| CN103017674A true CN103017674A (en) | 2013-04-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894213A (en) * | 2018-01-08 | 2018-04-10 | 河北科技大学 | Optical fiber frost penetration sensor |
| CN108267403A (en) * | 2018-01-10 | 2018-07-10 | 重庆大学 | A kind of fibre-optical sensing device and its manufacturing method for being used to monitor bridge pier surrounding soil erodsion loss |
| CN109811805A (en) * | 2018-12-15 | 2019-05-28 | 浙江工业大学 | A kind of ring type bridge pile foundation flushing monitoring system and its monitoring method |
| CN112146587A (en) * | 2020-09-11 | 2020-12-29 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN113866215A (en) * | 2021-09-27 | 2021-12-31 | 中交第二航务工程局有限公司 | Attached type bridge pile foundation scouring product real-time monitoring system and method |
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| CN101122478A (en) * | 2007-09-13 | 2008-02-13 | 哈尔滨工业大学 | Optical fibre grating flushing monitoring sensor and its manufacture method |
| CN101140176A (en) * | 2007-09-13 | 2008-03-12 | 哈尔滨工业大学 | High durability optical fiber grating wash out sensor |
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2012
- 2012-12-24 CN CN2012105662339A patent/CN103017674A/en active Pending
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| CN101122478A (en) * | 2007-09-13 | 2008-02-13 | 哈尔滨工业大学 | Optical fibre grating flushing monitoring sensor and its manufacture method |
| CN101140176A (en) * | 2007-09-13 | 2008-03-12 | 哈尔滨工业大学 | High durability optical fiber grating wash out sensor |
Non-Patent Citations (1)
| Title |
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| WEN XIONG ET.AL: "Instrumentation design for bridge scour monitoring using fiber Bragg grating sensors", 《APPLIED OPTICS》, vol. 51, no. 5, 10 February 2012 (2012-02-10), pages 547 - 557 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894213A (en) * | 2018-01-08 | 2018-04-10 | 河北科技大学 | Optical fiber frost penetration sensor |
| CN108267403A (en) * | 2018-01-10 | 2018-07-10 | 重庆大学 | A kind of fibre-optical sensing device and its manufacturing method for being used to monitor bridge pier surrounding soil erodsion loss |
| CN108267403B (en) * | 2018-01-10 | 2020-10-27 | 重庆大学 | Optical fiber sensing device for monitoring erosion loss of soil around pier and manufacturing method thereof |
| CN109811805A (en) * | 2018-12-15 | 2019-05-28 | 浙江工业大学 | A kind of ring type bridge pile foundation flushing monitoring system and its monitoring method |
| CN109811805B (en) * | 2018-12-15 | 2023-09-26 | 浙江工业大学 | Ring type bridge pile foundation scouring monitoring system and monitoring method thereof |
| CN112146587A (en) * | 2020-09-11 | 2020-12-29 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN112146587B (en) * | 2020-09-11 | 2022-06-21 | 张东昱 | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof |
| CN113866215A (en) * | 2021-09-27 | 2021-12-31 | 中交第二航务工程局有限公司 | Attached type bridge pile foundation scouring product real-time monitoring system and method |
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Application publication date: 20130403 |