CN106917420A - A kind of pile foundation scour monitoring device - Google Patents
A kind of pile foundation scour monitoring device Download PDFInfo
- Publication number
- CN106917420A CN106917420A CN201710013660.7A CN201710013660A CN106917420A CN 106917420 A CN106917420 A CN 106917420A CN 201710013660 A CN201710013660 A CN 201710013660A CN 106917420 A CN106917420 A CN 106917420A
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- pile foundation
- soil pressure
- monitoring device
- under water
- test tube
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 56
- 238000005259 measurement Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 abstract description 19
- 230000008859 change Effects 0.000 description 22
- 239000000835 fiber Substances 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
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013536 elastomeric material Substances 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
- 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
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation 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
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A kind of pile foundation scour 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.The present invention provides the pile foundation scour monitoring device that a kind of easy to operate, precision is higher, real-time is good, effectively realize long-range monitoring.
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 is observed the problem as engineering circles very relation in recent years.The bridge for causing is acted on down by current scour
Damage and failure is also that bridge structural health monitoring needs issues that need special attention, the long-term safety fortune to ensureing more Jiang Qiaoliang over strait
Row is significant.If the information of the soil layer of bridge pile foundation side by current scour change can be grasped in real time, 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 monitored by retainer instrument and
Portable instrument is monitored, the method that the principle of use has 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 cannot real-time continuous test, usually periodically 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, what its test was obtained is only that water becomes with the depth at silt interface
Change, it is impossible to consider the variable density of interface lower floor silt soil layer, therefore cannot accurately obtain whether pile foundation lateral earth pressure there occurs
Change.The precision of general measure is also very easily subject to the interference of the external environments such as wave, it is necessary to constantly be corrected to fit
Answer the environmental change in different waters.Second, this method can not monitor that bridge pile foundation nearside washes away the soil pressure for causing and changes,
What is obtained is that the landform of large scale under water washes away evolution, and stake side is on the contrary test blindspot.
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 under water, real-time is poor,
The deficiency of long-range monitoring cannot 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 pile foundation scour monitoring device of journey monitoring.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of pile foundation scour monitoring device, including test tube, measurement assembly and data collecting instrument under water, the position of test tube under water
In pile foundation side to be monitored, the measurement assembly is located at the surface side that meets water of the test tube under water, and the measurement assembly includes dynamometry
Post and soil pressure force cell, the soil pressure force cell are located in the load measurement column, and the load measurement column is from top to bottom
Be equidistantly spaced from the test tube under water, the signal output part of the soil pressure force cell with the data collecting instrument
Connection.
Further, the soil pressure force cell includes being used 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 radially arranges that 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.
Technology design of the invention is：Optical fiber is the sensitivity unit being most widely used in intelligent Material Systems research at present
One of part, its operation principle is that the change of external physical quantity causes the change of fiber optic hub wavelength, by cardiac wave in optical fiber Bragg
Change long 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 high precision.Additionally, the Real-time security monitoring of structure has turned into domestic and international research 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 high precision that FBG monitoring has, resistance to
The characteristics of property is good long, overcomes the shortcoming of conventional test methodologies, and 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 draw stress between Pile Soil and the safe margin for washing away.So can not only eliminate underwater sludge layer and back and forth change right
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.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
A kind of 1~Fig. 6 of reference picture, pile foundation scour monitoring device, the monitoring device includes test tube 2, measurement assembly under water
With data collecting instrument 1, positioned at pile foundation side to be monitored, the measurement assembly is located at the test tube under water to the test tube under water 2
Meet water surface side, and the measurement assembly includes load measurement column 3 and soil pressure force cell 4, and the soil pressure force cell 4 is located at
In the load measurement column 3, the load measurement column 3 is equidistantly spaced from the test tube under water 2 from top to bottom, and the soil pressure dynamometry is passed
The signal output part of sensor 4 is connected with the data collecting instrument 1.
Further, the soil pressure force cell 4 includes being used to sense the transmission rod 41 of soil pressure and is passed for perceiving
The fiber-optic grating sensor 42 of the soil pressure of the conduction of power bar 41, the transmission rod 41 coordinates with the fiber-optic grating sensor 42.
Further, the load measurement column 3 radially arranges that 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.
According to Fig. 4, test tube will squeeze into soil layer under water, 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 washes away can make soil pressure
Soil pressure on force cell changes, and fiber grating perceives the difference of strain, and thus the size of strain value can be learnt
The degree washed away, the data remote transmission that will be measured by data sending apparatus is analyzed to computer.
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 that cause is embedded in elastic construction is changed, and the data transfer bundle of lines dynamometry being made up of parallel fiber optic is passed
In data collecting instrument at the top of the signal transmission that sensor is measured to installation under water test tube, then by signal resolution and mechanical analysis
Scour depth change under water and the change of pile foundation lateral earth pressure can be obtained in real time.
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 and draw data wire by perforate.
The know-why 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 line 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
The drift that degree, the change of stress and strain cause is represented by：
In formula, ε is additional strain, and v is Poisson's ratio, PijIt is 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
Make the pressure history of below figure, pressure history position Pi front half sections of undergoing mutation are hydraulic pressure force value curve, mutation
It is afterwards the pressure value curve of soil pressure, 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 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
By changing physical dimension, the packing forms etc. of sensor in the structures such as bad building water conservancy, 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 be based on the platform of Ali's cloud, accommodate mass data, and number of servers can be with elastic dilatation.
Be embedded in fiber grating 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 durability very high measurement part, so that this patent washes away
Sensor has increased durability in wet condition.This sensor advantage is corrosion-resistant, sensing accuracy is high, 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 the sensor of different accuracy, 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 the Pile side soil excess under flood erosion effect can be played
Forewarning function during loss.The device sensing element fiber grating, force transmission mechanism uses the elastomeric material of transmission rod and inside, if
Ingenious, simple structure is counted, solves the problems, such as that large-scale building water conservancy structure foundation soil washes away, anticipated with great practical application
Justice.
Claims (4)
1. a kind of pile foundation scour monitoring device, it is characterised in that：The monitoring device includes test tube, measurement assembly and data under water
Acquisition 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,
The measurement assembly includes load measurement column and soil pressure force cell, and the soil pressure force cell is located at the load measurement column
Interior, the load measurement column is equidistantly spaced from the test tube under water from top to bottom, and the signal of the soil pressure force cell is defeated
Go out end to be connected with the data collecting instrument.
2. pile foundation scour monitoring device as claimed in claim 1, it is characterised in that：The soil pressure force cell includes using
With sense soil pressure transmission rod and for perceive transmission rod conduction soil pressure fiber-optic grating sensor, the transmission rod with
The fiber-optic grating sensor coordinates.
3. pile foundation scour monitoring device as claimed in claim 2, it is characterised in that：The load measurement column is radially arranged, described
Transmission rod is located at the inner chamber of the load measurement column, and the fiber-optic grating sensor is located at the bottom of the load measurement column.
4. the pile foundation scour monitoring device as described in one of claims 1 to 3, it is characterised in that：The monitoring device also includes
Data sending apparatus, the data collecting instrument is connected with the data sending apparatus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710013660.7A CN106917420B (en) | 2017-01-09 | 2017-01-09 | A kind of pile foundation scour monitoring device |
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|---|---|---|---|
| CN201710013660.7A CN106917420B (en) | 2017-01-09 | 2017-01-09 | A kind of pile foundation scour monitoring device |
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| Publication Number | Publication Date |
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| CN106917420A true CN106917420A (en) | 2017-07-04 |
| CN106917420B CN106917420B (en) | 2019-11-12 |
Family
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107460898A (en) * | 2017-08-09 | 2017-12-12 | 浙江工业大学 | A kind of sunk bridge pile foundation washes away real-time monitoring system and its monitoring method |
| CN107576427A (en) * | 2017-08-09 | 2018-01-12 | 浙江工业大学 | A kind of bridge pile foundation washes away change real-time tracking monitoring system and its monitoring method |
| 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 |
| CN109883454A (en) * | 2019-04-16 | 2019-06-14 | 山东大学 | A kind of magnetic-label sensor and preparation method thereof and channel scour detection device |
| CN110285911A (en) * | 2019-06-26 | 2019-09-27 | 湖南省航务工程有限公司 | A kind of pressure monitoring device for underwater demolition |
| CN114705338A (en) * | 2022-03-28 | 2022-07-05 | 中国长江三峡集团有限公司 | Real-time monitoring device and monitoring method for scouring of offshore wind power pile foundation |
| CN115200915A (en) * | 2022-09-14 | 2022-10-18 | 东莞理工学院 | Pier scouring real-time monitoring system based on distributed sensing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107460898A (en) * | 2017-08-09 | 2017-12-12 | 浙江工业大学 | A kind of sunk bridge pile foundation washes away real-time monitoring system and its monitoring method |
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| CN107576427B (en) * | 2017-08-09 | 2023-06-27 | 浙江工业大学 | Real-time tracking and monitoring system and monitoring method for scour variation of bridge pile foundation |
| 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 |
| CN109883454A (en) * | 2019-04-16 | 2019-06-14 | 山东大学 | A kind of magnetic-label sensor and preparation method thereof and channel scour detection device |
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| CN110285911B (en) * | 2019-06-26 | 2021-11-30 | 湖南省航务工程有限公司 | Pressure monitoring device for underwater blasting |
| CN114705338A (en) * | 2022-03-28 | 2022-07-05 | 中国长江三峡集团有限公司 | Real-time monitoring device and monitoring method for scouring of offshore wind power pile foundation |
| CN115200915A (en) * | 2022-09-14 | 2022-10-18 | 东莞理工学院 | Pier scouring real-time monitoring system based on distributed sensing equipment |
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