CN106917420B - A kind of pile foundation scour monitoring device - Google Patents
A kind of pile foundation scour monitoring device Download PDFInfo
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- CN106917420B CN106917420B CN201710013660.7A CN201710013660A CN106917420B CN 106917420 B CN106917420 B CN 106917420B CN 201710013660 A CN201710013660 A CN 201710013660A CN 106917420 B CN106917420 B CN 106917420B
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- soil pressure
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- pile foundation
- fiber
- load cell
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 18
- 230000008447 perception Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 19
- 230000008859 change Effects 0.000 description 12
- 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
- 239000013013 elastic material Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000006870 function 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
- 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
- 150000001875 compounds Chemical class 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
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000004177 elastic tissue Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000691 measurement 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
- 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
Abstract
A kind of pile foundation scour monitoring device, including underwater test tube, measurement component and data collecting instrument, the underwater test tube is located at pile foundation side to be monitored, the measurement component is located at the surface side that meets water of the underwater test tube, the measurement component includes load measurement column and soil pressure load cell, the soil pressure load cell is located in the load measurement column, the load measurement column is equidistantly spaced from from top to bottom in the underwater test tube, and the signal output end of the soil pressure load cell is connect with the data collecting instrument.The present invention provide it is a kind of it is easy to operate, precision is higher, real-time is good, effectively realizes the pile foundation scour monitoring device remotely monitored.
Description
Technical field
The present invention relates to the safety monitorings 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 technique
Bridge substructure supports entire superstructure and vehicular load by underwater pile, and underwater pile subjects all
The vertical load of bridge structure, the variation of soil pressure against piles directly determine the size of bearing capacity of pile foundation.And more Jiang Qiaoliang over strait
Underwater pile influenced by current scour, it may occur that Pile side soil Scour and Accretion, this has a significant impact to the safety of bridge pile foundation,
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 become in recent years engineering circles very relationship 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 the long-term safety fortune for guaranteeing more Jiang Qiaoliang over strait
Row is of great significance.It, can bridge again if the information that the soil layer that can grasp bridge pile foundation side in real time is changed by current scour
Accident odds, the service life of extending structure are effectively reduced using appropriate engineering reinforcement method in time during operation.
Monitoring to bridge pile foundation nearby underwater soil layer scour, current existing method formula be by retainer instrument monitoring and
Portable instrument monitoring, the method that the principle of use has sonar technique and multi-beam.The base of existing pile foundation scour test method
Present principles mainly measure the water surface to the change in depth between silt layer medium.As a whole, there are also shortcomings for these methods: the
One, these methods real-time continuous can not generally test, and usually periodically go out ship and be observed.And it cannot really consider erosion and deposition layer
To soil pressure against piles real change brought by complicated back and forth variation, what test obtained is only the depth change at water and silt interface
Change, can not consider the variable density of interface lower layer silt soil layer, therefore can not accurately obtain whether pile foundation lateral earth pressure has occurred
Variation.The also very easy interference by external environments such as waves of the precision of general measure, needs constantly to be corrected to fit
Answer the environmental change in different waters.Second, this method is unable to monitor to wash away caused soil pressure variation to bridge pile foundation nearside,
What is obtained is that the landform of underwater large scale washes away evolution, and stake side is test blindspot instead.
Summary of the invention
In order to overcome existing pile foundation nearby the complicated for operation of monitoring of underwater soil layer scour, precision is lower, real-time is poor,
Cannot achieve the deficiency remotely monitored, the present invention provide it is a kind of it is easy to operate, precision is higher, real-time is good, effectively realizes far
The pile foundation scour monitoring device of journey monitoring.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of pile foundation scour monitoring device, including underwater test tube, measurement component and data collecting instrument, the underwater test tube position
In pile foundation side to be monitored, the measurement component is located at the surface side that meets water of the underwater test tube, and the measurement component includes dynamometry
Column and soil pressure load cell, the soil pressure load cell are located in the load measurement column, and the load measurement column is from top to bottom
Be equidistantly spaced from the underwater test tube, the signal output end of the soil pressure load cell with the data collecting instrument
Connection.
Further, the soil pressure load cell includes transmission rod to incude soil pressure and for perceiving transmission rod
The fiber-optic grating sensor of the soil pressure of conduction, the transmission rod and the fiber-optic grating sensor cooperate.
Further, the load measurement column is radially arranged, the transmission rod is located at the inner cavity of the load measurement column, the optical fiber
Grating sensor is located at the bottom of the load measurement column.
The monitoring device further includes data sending apparatus, and the data collecting instrument is connect with the data sending apparatus.
Technical concept of the invention are as follows: optical fiber is the sensitivity member being most widely used in intelligent Material Systems research at present
One of part, its working principle is that the variation of external physical quantity causes the variation of fiber optic hub wavelength, by cardiac wave in optical fiber Bragg
Long variation obtains measured value.This measurement method clear thinking, it is convenient to operate, it is easy to be numerous engineers and technicians
Receive.The advantages of fiber sensing element, is mainly shown as electromagnetism interference；It is corrosion-resistant；Quasi-distributed measurement, absolute measurement, signal
Decay small；The advantages that high sensitivity, precision is high.In addition, the Real-time security monitoring of structure has become and studies both at home and abroad in recent years
One of hot spot, the optical fiber technology as monitoring structural health conditions important means have also obtained great development.Therefore the present apparatus combines
The advantages of fiber grating is perceived and transmitted pointedly has developed the optical fiber grating sensing for being suitble to underwater bridge pile foundation monitoring
It is high, resistance to have given full play to the precision that FBG monitoring has for the systematization real-time monitoring device of device and data transmission and parsing
The long good feature of property, the shortcomings that overcoming conventional test methodologies, are very suitable to newly-built and existing underwater bridge pile foundation wash away prison
It surveys, there is unique advantage.
This programme real-time perfoming pile foundation nearside different depth and the real-time soil pressure against piles variation monitoring for washing away overall process, 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 obtains stress between Pile Soil and wash away.Underwater sludge layer not only can be eliminated back and forth to change pair
Judge the influence of pile foundation scour safety, it is also more accurate, easy, which is disposably installed, long-range reality can be realized
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.
Detailed description of the invention
Fig. 1 is the sectional view of underwater test tube.
Fig. 2 is the top view of underwater test tube.
Fig. 3 is the operation principle schematic diagram of underwater test tube.
Fig. 4 is the transmission rod stress diagram of underwater test tube.
Fig. 5 is pressure history figure.
Fig. 6 is the flow chart of detection device.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig.1~Fig. 6, a kind of pile foundation scour monitoring device, the monitoring device include underwater test tube 2, measurement component
With data collecting instrument 1, the underwater test tube 2 is located at pile foundation side to be monitored, and the measurement component is located at the underwater test tube
Meet water surface side, and the measurement component includes load measurement column 3 and soil pressure load cell 4, and the soil pressure load cell 4 is located at
In the load measurement column 3, the load measurement column 3 is equidistantly spaced from from top to bottom in the underwater test tube 2, and the soil pressure dynamometry passes
The signal output end of sensor 4 is connect with the data collecting instrument 1.
Further, the soil pressure load cell 4 includes transmission rod 41 to incude soil pressure and passes for perceiving
The fiber-optic grating sensor 42 for the soil pressure that power bar 41 conducts, the transmission rod 41 cooperate 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 cavity 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 further includes data sending apparatus 5, and the data collecting instrument 1 connects with the data sending apparatus 5
It connects.
According to Fig.4, underwater test tube is squeezed into soil layer, the variation of extraneous soil pressure is allow to be 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 load cell changes, fiber grating perception strain difference, thus the size of strain value just it can be seen that
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 load cell deforms, and leads
It causes the optic fiber grating wavelength being embedded in elastic construction to change, dynamometry is passed by the data line that parallel fiber optic forms
The signal that sensor measures is transferred in the data collecting instrument installed at the top of test tube under water, then passes through signal resolution and mechanical analysis
It can be obtained the variation of underwater scour depth variation and pile foundation lateral earth pressure in real time.
Measuring cell is made of optical fiber, elastic material and soil pressure load cell, between soil pressure load cell
Away from can according to actual needs precise manner determine；The lead-out wire of fiber grating can cover hose by aperture and draw data line.
The technical principle and theoretical foundation of fiber-optic grating sensor:
λB=2n Λ
In formula, n is core model effective refractive index, and Λ is light screen periods.Temperature, stress, strain locating for the light grating
Or other physical quantitys, when changing, the period of grating or fiber core refractive index will change, so that the wavelength of reflected light be made to send out
Changing passes through the variation of reflection wavelength before and after measurement physical quantity variation, so that it may obtain the situation of change of measured physical quantity.Temperature
The caused drift of variation of degree, stress and strain may be expressed as:
In formula, ε is additional strain, and v is Poisson's ratio, PijFor the Pu Keer voltage coefficient of photoelastic tensor, α is fiber optic materials
Thermal expansion coefficient, 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 load cell by underwater test tube, the pressure value for measuring n difference is drawn
The pressure history such as the following figure is produced, pressure history mutation position Pi front half section is 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 become one of the hot issue of world research, and as one of its most promising sensitive original part
Optical fiber also obtain huge development, currently, fibre optical sensor be widely used for civil engineering, aerospace, petrochemical industry,
The fields such as medicine, environmental project, the health monitoring systems for constructing all -fiber also become 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, it is the function using optical fiber as sensing element
Energy property sensor, has the advantages that other types fibre optical sensor is incomparable, mainly has durability good, is applicable to environment evil
In the structures such as bad building water conservancy by change sensor structure size, packing forms etc., change with can be convenient range or
Precision reliability is good, and anti-electromagnetic interference capability is strong, and easily constitute sensing network and be easily installed laying etc..The collection of data and
Storage can accommodate mass data, number of servers can be with elastic dilatation based on the platform of Ali's cloud.
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 load cell, thus formed one can monitor the variation of extraneous soil thickness sensing is washed away based on fiber grating
Device.Optical fiber and elastic construction is compound and be put into soil pressure load cell, since soil pressure load cell has sealing
Property and using have high corrosion resistance material so that measurement part have very high durability, so that this patent washes away
Sensor has increased durability in wet condition.This sensor advantage be corrosion-resistant, sensing accuracy is high, electromagnetism interference,
Quasi-distributed monitoring, absolute measurement of physical quantity etc..Finally, this fiber scour sensor is suitable for the Practical Project of long term monitoring
It needs, 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 it is excessive to play the role of the Pile side soil under flood erosion
Forewarning function when loss.The device sensing element fiber grating, force transmission mechanism use transmission rod and internal elastic material, if
Ingenious, simple structure is counted, solves the problems, such as that large-scale building water conservancy structure foundation soil washes away, is anticipated with great practical application
Justice.
Claims (2)
1. a kind of pile foundation scour monitoring device, it is characterised in that: the monitoring device includes underwater test tube, measurement component and data
Acquisition Instrument, the underwater test tube are located at pile foundation side to be monitored, and the measurement component is located at the surface side that meets water of the underwater test tube,
The measurement component includes load measurement column and soil pressure load cell, and the soil pressure load cell is located at the load measurement column
Interior, the load measurement column is equidistantly spaced from from top to bottom in the underwater test tube, and the signal of the soil pressure load cell is defeated
Outlet is connect with the data collecting instrument；The soil pressure load cell includes the transmission rod and use to incude soil pressure
In the fiber-optic grating sensor of the soil pressure of perception transmission rod conduction, the transmission rod and the fiber-optic grating sensor cooperate,
The load measurement column radially arranges that the transmission rod is located at the inner cavity of the load measurement column, and the fiber-optic grating sensor is located at institute
State the bottom of load measurement column；Underwater test tube is squeezed into soil layer when use, the variation of extraneous soil pressure is made to be transferred to the position of load measurement column
It sets, the soil pressure force value at each transmission rod position is measured according to fiber-optic grating sensor on load measurement column, extraneous wave current, which washes away, to be made
Soil pressure on soil pressure load cell changes, the difference of fiber-optic grating sensor perception strain；Pass through parallel fiber optic
The data line of grating composition is transferred to the signal that soil pressure load cell measures the number installed at the top of test tube under water
It can be obtained underwater scour depth variation and pile foundation side soil pressure in real time according in Acquisition Instrument, then by signal resolution and mechanical analysis
The variation of power.
2. pile foundation scour monitoring device as described in claim 1, it is characterised in that: the monitoring device further includes data transmitting
Device, the data collecting instrument are connect with the data sending apparatus.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN106917420A CN106917420A (en) | 2017-07-04 |
| CN106917420B true CN106917420B (en) | 2019-11-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107460898B (en) * | 2017-08-09 | 2022-06-17 | 浙江工业大学 | Real-time monitoring system and monitoring method for submerged bridge pile foundation scouring |
| CN108755786B (en) * | 2018-05-31 | 2020-03-17 | 湖南工程学院 | Scouring monitoring device for offshore wind power pile foundation |
| CN109883454B (en) * | 2019-04-16 | 2020-07-31 | 山东大学 | Magnetic label sensor, manufacturing method thereof and riverbed scouring detection device |
| 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 |
| CN115200915B (en) * | 2022-09-14 | 2022-11-29 | 东莞理工学院 | Pier scouring real-time monitoring system based on distributed sensing equipment |
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| CN100538280C (en) * | 2007-09-13 | 2009-09-09 | 哈尔滨工业大学 | A kind of high durability optical fiber grating wash out sensor |
| US8402837B1 (en) * | 2011-11-29 | 2013-03-26 | International Marketing & Research, Inc. | System for field testing helical piles |
| CN103234723B (en) * | 2013-04-24 | 2016-01-20 | 南京理工大学 | Oscillatory type scour sensor |
| CN104343110B (en) * | 2014-10-29 | 2016-06-29 | 中国海洋大学 | Bridge soil around pile washes away in-situ monitoring method and system |
| CN105696637B (en) * | 2016-04-18 | 2017-09-15 | 河海大学 | It is contemplated that the lateral impedance,motional test measurement device and method of the bucket base for washing away influence |
| CN106091971A (en) * | 2016-06-08 | 2016-11-09 | 武汉理工大学 | The linear on-line monitoring system of Longspan Bridge based on fiber grating and monitoring method |
| CN206396814U (en) * | 2017-01-09 | 2017-08-11 | 浙江工业大学 | A kind of novel bridge pile foundation is under water by flushing monitoring device |
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