CN206396814U - A kind of novel bridge pile foundation is under water by flushing monitoring device - Google Patents
A kind of novel bridge pile foundation is under water by flushing monitoring device Download PDFInfo
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- CN206396814U CN206396814U CN201720020690.6U CN201720020690U CN206396814U CN 206396814 U CN206396814 U CN 206396814U CN 201720020690 U CN201720020690 U CN 201720020690U CN 206396814 U CN206396814 U CN 206396814U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 56
- 238000005259 measurement Methods 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000008859 change Effects 0.000 description 23
- 238000012544 monitoring process Methods 0.000 description 18
- 239000013307 optical fiber Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000036541 health Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 210000003733 optic disk Anatomy 0.000 description 1
- 239000000382 optic material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
A kind of novel bridge pile foundation is under water by flushing monitoring device, including test tube under water, measurement assembly and data collecting instrument, the test tube under water is located at pile foundation side to be monitored, the measurement assembly is located at the surface side that meets water of the test tube under water, the measurement assembly includes load measurement column and soil pressure force cell, the soil pressure force cell is located in the load measurement column, the load measurement column is equidistantly spaced from the test tube under water from top to bottom, and the signal output part of the soil pressure force cell is connected with the data collecting instrument.A kind of easy to operate, precision of the utility model offer is higher, real-time is good, effectively realize the novel bridge pile foundation remotely monitored under water by flushing monitoring device.
Description
Technical field
The present invention relates to the safety monitoring of more river science of bridge building substructure over strait, and in particular to a kind of water Bridge pile foundation
The quantitative real-time flushing monitoring device of plinth.
Background technology
Bridge substructure supports whole superstructure and vehicular load by underwater pile, and underwater pile subjects all
The vertical load of bridge structure, the change of soil pressure against piles directly determines the size of bearing capacity of pile foundation.And more Jiang Qiaoliang over strait
Underwater pile influenceed by current scour, it may occur that Pile side soil Scour and Accretion, this security to bridge pile foundation has a significant impact,
Even bridge collapse is caused to destroy, such accident all happens occasionally both at home and abroad in recent years.Therefore, near in science of bridge building to pile foundation
Underwater soil layer be observed as engineering circles in recent years very relation the problem of.By the lower caused bridge of current scour effect
Damage and failure is also that bridge structural health monitoring needs issues that need special attention, to ensureing that more Jiang Qiaoliang long-term safety over strait is transported
Row is significant.If the information that the soil layer that can grasp bridge pile foundation side in real time is changed by current scour, you can bridge again
Accident odds, the service life of extending structure are effectively reduced using appropriate engineering reinforcement method in time during operation.
To the monitoring of soil layer scour under water near bridge pile foundation, current existing method formula be by retainer instrument monitoring and
Portable instrument is monitored, and the principle of use has the method for sonar technique and multi-beam.The base of existing pile foundation scour method of testing
Present principles are mainly the measurement water surface to the change in depth between silt layer medium.As a whole, these methods also have weak point：The
One, these methods typically can not real-time continuous test, be usually periodically to go out ship and be observed.And can not really consider erosion and deposition layer
Complicated reciprocal change brought to soil pressure against piles real change, it is only that water and the depth at silt interface become that it, which tests obtain,
Change, it is impossible to consider the variable density of interface lower floor silt soil layer, therefore can not accurately obtain whether pile foundation lateral earth pressure there occurs
Change.The precision of general measure is also very easily fitted by the interference of the external environments such as wave, it is necessary to constantly be corrected
Answer the environmental change in different waters.Second, this method can not monitor that bridge pile foundation nearside washes away caused soil pressure change,
What is obtained is that the landform of large scale under water washes away evolution, and stake side is test blindspot on the contrary.
The content of the invention
In order to overcome near existing pile foundation that the complex operation of the monitoring of soil layer scour, precision are relatively low, real-time is poor under water,
The deficiency remotely monitored can not be realized, a kind of easy to operate, precision of present invention offer is higher, real-time is good, it is remote effectively to realize
The novel bridge pile foundation of journey monitoring is under water by flushing monitoring device.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of novel bridge pile foundation is under water by flushing monitoring device, including test tube, measurement assembly and data acquisition under water
Instrument, the test tube under water is located at pile foundation side to be monitored, and the measurement assembly is located at the surface side that meets water of the test tube under water, described
Measurement assembly includes load measurement column and soil pressure force cell, and the soil pressure force cell is located in the load measurement column, institute
State load measurement column to be equidistantly spaced from from top to bottom in the test tube under water, the signal output part of the soil pressure force cell is equal
It is connected with the data collecting instrument.
Further, the soil pressure force cell is included to sense the transmission rod of soil pressure and for perceiving transmission rod
The fiber-optic grating sensor of the soil pressure of conduction, the transmission rod coordinates with the fiber-optic grating sensor.
Further, the load measurement column is radially arranged, the transmission rod is located at the inner chamber of the load measurement column, the optical fiber
Grating sensor is located at the bottom of the load measurement column.
The monitoring device also includes data sending apparatus, and the data collecting instrument is connected with the data sending apparatus.
The present invention technical concept be：Optical fiber is the sensitivity member being most widely used at present in intelligent Material Systems research
One of part, its operation principle is that the change of external physical quantity causes the change of fiber optic hub wavelength, the cardiac wave in optical fiber Bragg
Long change obtains measured value.This measuring method clear thinking, simple operation, it is easy to be numerous engineers and technicians
Receive.The advantage of fiber sensing element is mainly shown as electromagnetism interference；It is corrosion-resistant；Quasi-distributed measurement, absolute measurement, signal
Decay is small；Sensitivity is high, the advantages of precision is high.In addition, the Real-time security monitoring of structure turns into what is studied both at home and abroad in recent years
One of focus, great development has also been obtained as the optical fiber technology of monitoring structural health conditions important means.Therefore the present apparatus is combined
The advantage that fiber grating is perceived and transmitted, pointedly have developed the optical fiber grating sensing for being adapted to bridge pile foundation monitoring under water
Device and data transfer and the systematization real-time monitoring device of parsing, have given full play to the precision that FBG monitoring has high, resistance to
The characteristics of property is good long, overcomes the shortcoming of conventional test methodologies, be especially suitable for newly-built and existing bridge pile foundation under water washes away prison
Survey, with unique advantage.
This programme carries out pile foundation nearside different depth and washes away the real-time soil pressure against piles variation monitoring of overall process in real time, from
And influence of the scour depth to pile foundation stress is obtained, and aperiodicity change of the soil pressure against piles in the case where wave current washes away can be analyzed, it is real
When the safe margin that draws stress between Pile Soil and wash away.It so can not only eliminate the reciprocal change pair of underwater sludge layer
Judge the influence of pile foundation scour safety, it is also more accurate, easy, the monitoring device is disposably installed, you can realize long-range real
When monitor.
Beneficial effects of the present invention are mainly manifested in：Easy to operate, precision is higher, real-time is good, it is long-range effectively to realize
Monitoring.
Brief description of the drawings
Fig. 1 is the profile of test tube under water.
Fig. 2 is the top view of test tube under water.
Fig. 3 is the operation principle schematic diagram of test tube under water.
Fig. 4 is the transmission rod stress diagram of test tube under water.
Fig. 5 is pressure history figure.
Fig. 6 is the flow chart of detection means.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
1~Fig. 6 of reference picture, a kind of novel bridge pile foundation is under water by flushing monitoring device, and the monitoring device includes water
Lower test tube 2, measurement assembly and data collecting instrument 1, the test tube under water 2 are located at pile foundation side to be monitored, the measurement assembly position
In the surface side that meets water of the test tube under water, the measurement assembly includes load measurement column 3 and soil pressure force cell 4, the soil pressure
Power force cell 4 is located in the load measurement column 3, and the load measurement column 3 is equidistantly spaced from test tube 2 under water from top to bottom
On, the signal output part of the soil pressure force cell 4 is connected with the data collecting instrument 1.
Further, the soil pressure force cell 4 includes the transmission rod 41 to sense soil pressure and passed for perceiving
The fiber-optic grating sensor 42 for the soil pressure that power bar 41 conducts, the transmission rod 41 coordinates with the fiber-optic grating sensor 42.
Further, the load measurement column 3 is radially arranged, the transmission rod 41 is located at the inner chamber of the load measurement column 3, described
Fiber-optic grating sensor 42 is located at the bottom of the load measurement column 3.
The monitoring device also includes data sending apparatus 5, and the data collecting instrument 1 connects with the data sending apparatus 5
Connect.
It according to Fig. 4, test tube will squeeze under water in soil layer, and the change of extraneous soil pressure is transferred to load measurement column 3
Position, the soil pressure force value at each transmission rod position is measured according to optical fiber on load measurement column, extraneous wave current, which washes away, can make soil pressure
Soil pressure on force cell is changed, and fiber grating perceives the difference of strain, and thus the size of strain value can be learnt
The degree washed away, is analyzed the data remote transmission measured to computer by data sending apparatus.
By design requirement by the soil layer near the pile foundation of sensor arrangement to bridge cross Yangtse River over strait so that soil pressure dynamometry
Sensor is contacted with the soil body.When Pile side soil is by current scour, the elastic construction in soil pressure force cell deforms, and leads
The optic fiber grating wavelength being embedded in elastic construction is caused to change, the data transfer bundle of lines dynamometry being made up of parallel fiber optic is passed
The signal that sensor is measured is transferred in the data collecting instrument installed at the top of test tube under water, then passes through signal resolution and mechanical analysis
Scour depth change under water and the change of pile foundation lateral earth pressure in real time can be obtained.
Measuring cell is made up of optical fiber, elastomeric material and soil pressure force cell, between soil pressure force cell
Away from can according to the actual requirements precise manner determine；The lead-out wire of fiber grating can cover flexible pipe by perforate and draw data wire.
The technical principle and theoretical foundation of fiber-optic grating sensor：
λB=2n Λ
In formula, n is core effective refractive index, and Λ is light screen periods.When the temperature residing for light grating, stress, strain
Or other physical quantitys, when changing, the cycle of grating or fiber core refractive index will change, so that the wavelength hair of reflected light
Changing, by the change for measuring reflection wavelength before and after physical quantity variation, it is possible to obtain the situation of change of measured physical quantity.Temperature
Drift caused by degree, the change of stress and strain is represented by：
In formula, ε is additional strain, and v is Poisson's ratio, PijFor the Pu Keer voltage coefficients of photoelastic tensor, α is fiber optic materials
Thermal coefficient of expansion, Δ T be temperature variation.
According to the formula of the mechanics of materials, obtain
F=σ A
In formula, σ is soil pressure, and A is the surface area of soil pressure sensor.
As shown in figure 5, measuring n soil pressure force cell by test tube under water, the pressure value for measuring n difference is painted
The pressure history of below figure is made, pressure history undergos mutation position Pi front half sections for hydraulic pressure force value curve, mutation
It is the pressure value curve of soil pressure afterwards, it can thus be appreciated that the depth of water and scour depth.
α monitoring structural health conditions turn into one of hot issue of world research, and are used as one of its most promising sensitive original paper
Optical fiber also obtain huge development, at present, fibre optical sensor be widely used for civil engineering, Aero-Space, petrochemical industry,
The fields such as medical science, environmental project, building the health monitoring systems of all -fiber also turns into the developing goal of monitoring structural health conditions from now on
One of.Sensor based on optical fiber is one kind of optic-fiber monitoring system sensing probe, and it is the work(using optical fiber as sensing element
Energy property sensor, with the unrivaled advantage of other types fibre optical sensor, mainly there is good endurance, is applicable to environment evil
Physical dimension, packing forms in the structures such as bad building water conservancy by changing sensor etc., can easily change range or
Precision reliability is good, and anti-electromagnetic interference capability is strong, and easily constitutes sensing network and be easily installed laying etc..The collection of data and
Storage can the platform based on Ali's cloud, accommodate mass data, number of servers can be with elastic dilatation.
Fiber grating is embedded in elastic construction by the present embodiment, then elastic construction and fiber grating are entirely put into soil pressure
In power force cell, thus formed one can monitor the change of extraneous soil thickness sensing is washed away based on fiber grating
Device.Optical fiber and elastic construction are combined and is put into soil pressure force cell, because soil pressure force cell has sealing
Property and using the material with high corrosion resistance so that there is very high durability measurement part, so that this patent washes away
Sensor has increased durability in wet condition.This sensor advantage be high corrosion-resistant, sensing accuracy, electromagnetism interference,
Quasi-distributed monitoring, absolute measurement of physical quantity etc..Finally, this fiber scour sensor is suitable to the Practical Project of long term monitoring
Need, and different accuracy, the sensor of different ranges can be designed according to requirement of engineering.This optical fiber grating wash out sensor
The degradation degree of more river bridge Pile side soil over strait can be effectively monitored, and it is excessive to play the Pile side soil under flood erosion effect
Forewarning function during loss.The device sensing element fiber grating, force transmission mechanism uses transmission rod and internal elastomeric material, if
Ingenious, simple structure is counted, the problem of large-scale building water conservancy structure foundation soil washes away is solved, anticipated with great practical application
Justice.
Claims (4)
1. a kind of novel bridge pile foundation is under water by flushing monitoring device, it is characterised in that：The monitoring device includes surveying under water
Pipe, measurement assembly and data collecting instrument, the test tube under water are located at pile foundation side to be monitored, and the measurement assembly is located at the water
The surface side that meets water of lower test tube, the measurement assembly includes load measurement column and soil pressure force cell, the soil pressure force-measuring sensing
Device is located in the load measurement column, and the load measurement column is equidistantly spaced from the test tube under water from top to bottom, and the soil pressure is surveyed
The signal output part of force snesor is connected with the data collecting instrument.
2. novel bridge pile foundation as claimed in claim 1 is under water by flushing monitoring device, it is characterised in that：The soil pressure
Force cell includes the transmission rod to sense soil pressure and the fiber grating of the soil pressure for perceiving transmission rod conduction is passed
Sensor, the transmission rod coordinates with the fiber-optic grating sensor.
3. novel bridge pile foundation as claimed in claim 2 is under water by flushing monitoring device, it is characterised in that：The load measurement column
Radially arrange, the transmission rod is located at the inner chamber of the load measurement column, the fiber-optic grating sensor is located at the load measurement column
Bottom.
4. the novel bridge pile foundation as described in one of claims 1 to 3 is under water by flushing monitoring device, it is characterised in that：Institute
Stating monitoring device also includes data sending apparatus, and the data collecting instrument is connected with the data sending apparatus.
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| CN201720020690.6U CN206396814U (en) | 2017-01-09 | 2017-01-09 | A kind of novel bridge pile foundation is under water by flushing monitoring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917420A (en) * | 2017-01-09 | 2017-07-04 | 浙江工业大学 | A kind of pile foundation scour monitoring device |
| CN108755786A (en) * | 2018-05-31 | 2018-11-06 | 湖南工程学院 | A kind of flushing monitoring device of offshore wind farm pile foundation |
| 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 |
| CN110080950A (en) * | 2018-04-19 | 2019-08-02 | 湖南工程学院 | A kind of offshore wind farm pile foundation and its stability monitoring method |
| CN111305284A (en) * | 2020-02-22 | 2020-06-19 | 重庆大学 | Bridge pile foundation erosion model test device and method based on transparent soil |
| 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 |
-
2017
- 2017-01-09 CN CN201720020690.6U patent/CN206396814U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917420A (en) * | 2017-01-09 | 2017-07-04 | 浙江工业大学 | A kind of pile foundation scour monitoring device |
| CN110080950A (en) * | 2018-04-19 | 2019-08-02 | 湖南工程学院 | A kind of offshore wind farm pile foundation and its stability monitoring method |
| CN110080950B (en) * | 2018-04-19 | 2020-10-23 | 湖南工程学院 | Offshore wind power pile foundation and stability monitoring method thereof |
| CN108755786A (en) * | 2018-05-31 | 2018-11-06 | 湖南工程学院 | A kind of flushing monitoring device of offshore wind farm pile foundation |
| 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 |
| CN111305284A (en) * | 2020-02-22 | 2020-06-19 | 重庆大学 | Bridge pile foundation erosion model test device and method based on transparent soil |
| CN111305284B (en) * | 2020-02-22 | 2020-12-29 | 重庆大学 | Bridge pile foundation erosion model test device and method based on transparent soil |
| 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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