CN107576427A - A kind of bridge pile foundation washes away change real-time tracking monitoring system and its monitoring method - Google Patents
A kind of bridge pile foundation washes away change real-time tracking monitoring system and its monitoring method Download PDFInfo
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- CN107576427A CN107576427A CN201710676139.1A CN201710676139A CN107576427A CN 107576427 A CN107576427 A CN 107576427A CN 201710676139 A CN201710676139 A CN 201710676139A CN 107576427 A CN107576427 A CN 107576427A
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Abstract
The invention discloses a kind of bridge pile foundation to wash away change real-time tracking monitoring system and its monitoring method, including pile foundation and the bridge pier being arranged in pile foundation, data handling system is fixedly installed in the pier coping portion, the opening position that the bridge pier is located at below the water surface is fixedly installed the miniature osmotic pressure sensor of fiber grating, on the riverbed of the pile foundation bottom spherical heavy iron is provided with the opening position close to pile foundation, the spherical heavy iron surface is provided with four fiber bragg grating pressure sensors and a miniature osmotic pressure sensor of fiber grating, and fibre optic gyroscope is equipped with inside the spherical heavy iron；It is connected at the top of the spherical heavy iron by iron chain or steel wire with pier coping portion；The invention has the advantages that can be widely applied in science of bridge building safety monitoring environment that is newly-built or having built up, there is high-durability, high-precision, simple in construction, real-time monitoring and be easy to engineering laying.
Description
Technical field
The present invention relates to field of measuring technique, and in particular to a kind of bridge pile foundation wash away change real-time tracking monitoring system and
Its monitoring method.
Background technology
China mountains and rivers are numerous, rivers in length and breadth, be a bridge big country, with the development of science and technology, China at present no matter
It is bridge construction technology, or bridge quantity has all ranked among world forefront.The various extra-large bridges across Jiang Hai, and feature
Viaduct complete, handsome in appearance, overpass, build up like the mushrooms after rain.Current national highway bridge up to more than 100 ten thousand,
Each different times are built in respectively.
China's complex geologic conditions, many highways, railroad bridge are located on the lake of rivers sea, and the substructure of bridge is led to
Crossing underwater pile supports whole superstructure and vehicular load, underwater pile to subject the vertical load of all bridge structures, and
The change of soil pressure against piles then directly determines the size of bearing capacity of pile foundation.But inevitably, washing away for current can cause
Pile side soil Scour and Accretion, so as to which the soil pressure of a side can be influenceed, therefore acted on lower caused bridge damnification by current scour at present and broken
It is bad to have become bridge structural health monitoring issues that need special attention.
Bridge pile foundation is washed away and is monitored, current existing method formula is by retainer instrument monitoring and portable instrument
Monitoring, the principle of use have the method for sonar technique and multi-beam, are all mainly to measure the water surface to the depth between silt layer medium
Change.But these methods also have weak point：First, these methods real-time continuous can not be typically tested, it is necessary to periodically go out ship
It is observed, and is influenceed caused by the reciprocal change of the complexity that erosion and deposition layer can not be rejected, interface lower floor silt soil layer can not be considered
Variable density, therefore can not accurately obtain whether pile foundation lateral earth pressure is changed.Second, this method can not monitor
Bridge pile foundation nearside wash away caused by soil pressure change, what is obtained is that the landform of underwater large scale washes away evolution, and stake side is on the contrary
Test blindspot.
For the Complex Water Environment and the difficult point of flushing monitoring residing for current bridge scouring, the invention provides a kind of bridge pier
The real-time monitoring system of pile foundation scour, the dynamic that bridge pile foundation washes away can be monitored in real time, adaptive tracing supporting course, is eliminated
Influence of the mud to monitoring, normal operation and the traffic of bridge are not influenceed, and with simple to operate, stable performance, monitoring number
According to it is accurate the advantages that.
This monitoring system uses fiber-optic grating sensor.The operation principle of fiber grating is to utilize the photosensitive of fiber optic materials
Property, the incident light field pattern that is concerned with is write by fibre core by the method for ultraviolet photoetching, the folding along fibre core axial direction is produced in fibre core
Rate cyclically-varying is penetrated, so as to form the phase grating in permanent space, it is acted on substantially in fibre core, and formation is one narrow
(transmission or reflection) wave filter or speculum of band.When a beam of broad spectrum light passes through fiber grating, meet fiber grating Bradley
The wavelength of glazing bar part will produce reflection, and remaining wavelength continues to transmit through fiber grating.
Fiber grating have small volume, wavelength selectivity are good, do not influenceed by nonlinear effect, polarize it is insensitive, be easy to
Fibre system connection, easy to use and maintenance, bandwidth range is big, added losses are small, device miniaturization, coupling are good, can be with it
His optical fibre device such as merges into an organic whole at characteristic, and the fiber grating manufacture craft comparative maturity, is easily formed large-scale production, cost
It is low, therefore it has good practicality, this monitoring system uses fiber bragg grating pressure sensor, takes full advantage of fiber grating
Above-mentioned advantage, the shortcomings that overcoming traditional monitoring, preferably with present under water to the flushing monitoring of bridge pile foundation.
The content of the invention
It is accurately and reliably a kind of the invention provides real-time tracking monitoring, monitoring for the deficiencies in the prior art
Bridge pile foundation washes away change real-time tracking monitoring system and its monitoring method.
Technical scheme is as follows：
A kind of bridge pile foundation washes away change real-time tracking monitoring system, including pile foundation and the bridge pier that is arranged in pile foundation, its
It is characterised by, data handling system is fixedly installed in the pier coping portion, and the opening position that the bridge pier is located at below the water surface, which is fixed, to be set
The miniature osmotic pressure sensor of fiber grating is equipped with, it is spherical heavy to be provided with the riverbed of the bridge pier bottom in the opening position close to pile foundation
Iron, the spherical heavy iron surface are provided with four fiber bragg grating pressure sensors and a miniature osmotic pressure sensor of fiber grating,
Fibre optic gyroscope is equipped with inside the spherical heavy iron；Pass through iron chain or steel wire and pier coping portion at the top of the spherical heavy iron
It is connected；Fiber grating miniature osmotic pressure sensor, fiber bragg grating pressure sensor and the fibre optic gyroscope pass through light respectively
Fine data wire is connected with data handling system circuit.
A kind of described bridge pile foundation washes away change real-time tracking monitoring system, it is characterised in that the spherical heavy iron is adopted
With a diameter of 28-32cm steel ball, wall thickness 0.7-0.9cm, inside is hollow structure, and can be added as needed inside it
Extra pouring weight；The spherical heavy iron outer surface is provided with HCA-108 roofing acrylic acid waterproof coating layers.
A kind of described bridge pile foundation washes away change real-time tracking monitoring system, it is characterised in that the spherical heavy iron exists
Embedded depth on riverbed is 9-11cm.
A kind of described bridge pile foundation washes away change real-time tracking monitoring system, it is characterised in that the spherical heavy iron is extremely
One is provided with less.
A kind of described bridge pile foundation washes away the monitoring method of change real-time tracking monitoring system, it is characterised in that including
Following steps：
1) fluctuation of water level is monitored in real time by the miniature osmotic pressure sensor of the fiber grating being arranged on bridge pier；Pass through setting
The miniature osmotic pressure sensor of fiber grating on spherical heavy iron monitors extraneous water pressure change；And two sensorses data are passed through into light
Fine data wire reaches data handling system.
2) extraneous soil pressure and water pressure are monitored in real time by fiber bragg grating pressure sensor, and data are passed through into fiber count
Data handling system is reached according to line.
3) rotational angle of spherical heavy iron is positioned by fibre optic gyroscope and monitors spherical heavy iron in current scour and punching
Rolling situation in the forming process of brush hole, and data are reached into data handling system by optical fiber data line.
4) data handling system is to from the miniature osmotic pressure sensor of fiber grating, fiber bragg grating pressure sensor and optical fiber top
Data analysis and mechanical analysis that the data of spiral shell instrument are integrated draw the real time status washed away.
A kind of described bridge pile foundation washes away the monitoring method of change real-time tracking monitoring system, it is characterised in that described
The comparative analysis of the miniature osmotic pressure sensor of fiber grating and fiber bragg grating pressure sensor data on bridge pier, can reject tidal bulge
Influence of the SEA LEVEL VARIATION caused by ebb to pressure sensor.
A kind of bridge pile foundation washes away the monitoring method of change real-time tracking monitoring system, it is characterised in that the ball
The comparative analysis of the miniature osmotic pressure sensor of fiber grating and fiber bragg grating pressure sensor data on the heavy iron of shape, can be calculated back
Silt the thickness of the layer and the distance on soil layer surface to the water surface.
A kind of described bridge pile foundation washes away the monitoring method of change real-time tracking monitoring system, it is characterised in that described
The date comprision of gyroscope and any one fiber bragg grating pressure sensor on spherical heavy iron in spherical heavy iron, can be pushed away
The buried depth depth of the corresponding fiber bragg grating pressure sensor of export.
The invention has the advantages that the system is mainly for bridge pile foundation local environment feature and at this stage to bridge base
Plinth wash away be unable to continuous monitoring and the river that The turbulent river crashes its way through do not apply to present situation, suitable in real time monitoring underwater pile near by
The variation in water pressure caused by soil pressure against piles change caused by washing away and fluctuation in stage.The features of the present invention is to supervise in real time
Survey time silt soil layer all thickness, and can monitor the change in depth of scour hole in real time, while can be according to engineering demand near monitoring point
Multiple monitoring devices are arranged, can be widely applied in science of bridge building safety monitoring environment that is newly-built or having built up have high resistance to
Long property, high-precision, simple in construction, real-time the advantages that monitoring and being easy to engineering laying.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of the spherical heavy iron of the present invention；
Fig. 3 is the monitoring flow chart of the present invention；
Fig. 4 be the present invention spherical heavy iron just bury buried depth calculating mechanical analysis figure；
Fig. 5 is earthing situation i schematic diagrames on the spherical heavy iron of the present invention；
Fig. 6 is earthing situation ii schematic diagrames on the spherical heavy iron of the present invention；
Fig. 7 is earthing situation iii schematic diagrames on the spherical heavy iron of the present invention；
In figure：1- data handling systems, the spherical heavy iron of 2-, the miniature osmotic pressure sensor of 3- fiber gratings, 4- fiber grating pressures
Force snesor.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in figs. 1-7, a kind of bridge pile foundation washes away change real-time tracking monitoring system and its monitoring method, including data
Processing system 1, spherical heavy iron 2, the miniature osmotic pressure sensor 3 of fiber grating and fiber bragg grating pressure sensor 4.Spherical heavy iron 2, it is interior
Portion is hollow, a diameter of 30cm, wall thickness 0.8cm；Surface is provided with four fiber bragg grating pressure sensors 4 and a fiber grating
Miniature osmotic pressure sensor 3, inside are equipped with fibre optic gyroscope and can be extra toward addition inside spherical heavy iron according to requirement of engineering
Pouring weight, spherical heavy iron 2 can roll with the formation of current scour and scour hole, bridge pile foundation be washed away with reference to gyroscope dynamic
State is monitored in real time；The spherical top of heavy iron 2 is fixed with steel strand wires or iron chain is connected to monitoring point bridge pier top surface, is easy to reclaim
Or decentralization；Multiple spherical heavy iron 2 can be thrown into by diverse location near pile foundation according to requirement of engineering, improve monitoring accuracy.
Gyroscope selects fibre optic gyroscope, is fixed at the centre of form of spherical heavy iron 2, is responsible for the rotation of the spherical heavy iron 2 of positioning
Angle is washed away with monitoring rolling situation of the spherical heavy iron 2 in current scour and scour hole forming process so as to fetching portion
Real-time current intelligence.When spherical heavy iron rotates, gyroscope can measure rotational angle, with reference to each cell pressure reading
The accurate buried depth of spherical heavy iron can be released.
The miniature osmotic pressure sensor 3 of fiber grating, shares two, and one is fixed on bridge pier, there is certain depth apart from the water surface
Degree, the fluctuation of water level is monitored by variation in water pressure, and data are reached into data handling system 1 by optical fiber data line in real time；Separately
One is fixed on the spherical surface of heavy iron 2, be responsible for the change of monitoring extraneous water pressure and with the monitoring number of fiber bragg grating pressure sensor 3
According to comparing, and combine the buried depth that formula calculates spherical heavy iron 2.
Fiber bragg grating pressure sensor 4, the fixed and spherical heavy surface of iron 2 are right with the rotation and rolling of spherical heavy iron 2
Extraneous soil pressure and water pressure are monitored in real time.
Data handling system 1 is fixed on the pile foundation of bridge pier of measuring point to be wirelessly transferred fiber Bragg grating (FBG) demodulator, passes through optical fiber
Data wire miniature with fiber grating osmotic pressure sensor 3, fiber bragg grating pressure sensor 4 and gyroscope are connected, by what is received
Data reach cloud database by being wirelessly transferred.Finally by computer to the miniature osmotic pressure sensor of fiber grating 3, optical fiber light
The data of grid voltage force snesor 4, which are contrasted and analyzed and combine the data of gyroscope, draws the real-time shape that bridge pile foundation washes away
Condition.
The miniature osmotic pressure sensor 3 of fiber grating in real time reaches data data handling system 1 in the form of wavelength；Wavelength
Pressure can be converted into by equation below：
ps=μp1Δλ2+μp2Δλ；
Δ λ=(λ-λ0)-μt(T-T0)；
In formula, μp1(Pa/nm)：Constant；
μp2(Pa/nm)：Constant；
λ0(nm)：The initial wavelength of the miniature osmotic pressure sensor of optical fibre optical fibre grating during measurement；
T0(℃)：Original ambient temperature during measurement；
λ(nm)：Wavelength during pressure measxurement；
T(℃)：Environment temperature during pressure measxurement；
μt(nm/℃)：Constant, it is the ratio of wavelength shift value/temperature；
During by ordinary water level, the detection reading of the miniature osmotic pressure sensor 3 of fiber grating on bridge pier is designated as ps0, will be because of tide
The monitoring reading for playing the miniature osmotic pressure sensor 3 of ebb fiber grating is designated as ps；Then have
Δps=ps-ps0；
Δ p in above formulasFor variation in water pressure value caused by fluctuation in stage.
The data of gained fluctuation in stage can be used for the analysis that is influenceed on bridge pile foundation security and stability of SEA LEVEL VARIATION, and with light
The comparative analysis of the fine data of grating pressure sensor 4, reject influence of the SEA LEVEL VARIATION to pressure sensor caused by tide bulge and fall；
Nearby hydraulic pressure force data can compare the spherical heavy iron 2 of gained with the Monitoring Data of fiber bragg grating pressure sensor 4, be back-silted for calculating
The thickness of the layer and the distance on soil layer surface to the water surface.
Fiber bragg grating pressure sensor 4 can pass through formula in water with the wavelength readings in soil：
P=μp[(λ-λ0)-μt(T-T0)]；
In formula, μp(pa/nm)：Constant, it is the ratio of cell pressure/wavelength；
Kt(nm/C°)：Constant, it is the ratio of wavelength shift value/temperature；
λ0(nm)：Pressure fiber grating initial wavelength during measurement；
T0(nm)：External temp fiber grating initial wavelength during measurement；
λ(nm)：Wavelength during pressure measxurement；
T(nm)：External temp optic fiber grating wavelength during pressure measxurement；
Pressure is converted into, the data analysis integrated by the data of osmotic pressure sensor 3 miniature with fiber grating and power
The real time status washed away can be tried to achieve by learning parsing.
The design focal point of the present invention is as scour depth increase and the formation of scour hole, spherical heavy iron can roll
It is dynamic, and stably with riverbed holding force layer surface.Change of washing away and back-silt is monitored by the way that fiber bragg grating pressure sensor 4 is dynamic in real time
Change.Obtain the unit weight γ (N/m of monitoring point supporting course soil3), internal friction angleEtc. data, and consider current scour to supporting course
The influence of surface certain depth soil density, reduction coefficient β (0 ＜ β≤1) is taken to γ, using β γ as supporting course topsoil
Proportion, β concrete numerical value determines according to the soil property of monitoring field.Consider the riverbed earthen feelings of monitoring point；Ensureing ball
Shape sink iron 2 embedded depth of foundation be 10cm in the case of calculate sinking the pouring weight quality of extra addition inside iron：
G1+G2=FC+Ff………①
In formula, G1Conduct oneself with dignity (N) for spherical heavy iron；
G2For the quality (N) of extra addition pouring weight；
FCFor the resistance (N) of soil；
FfFor the buoyancy (N) of water.
Ff=ρwGV is arranged ... ... 2. in formula, ρwFor the density (N/m of water3)；
G is acceleration of gravity (N/kg)；
VRowFor the volume (m of spherical heavy iron3)。
With reference to soil mechanics, the sphere being buried in the earth to spherical heavy iron does integral and calculating：
In formula, γ ' (N/m3)：The effective unit weight of riverbed supporting course soil, takes γ '=β γ-γw；
z(m)：For integral and calculating point buried depth；
c(Pa)：For the cohesive strength of riverbed supporting course soil, non-cohesive soil c=0；
Kp：For coefficient of passive earth pressure,
By 2. with the extra weight G for adding pouring weight can be obtained in 3. substituting into 1.2。
The purpose that spherical heavy iron 2 designs certain just buried depth is to prevent spherical heavy iron 2 in riverbed holding force layer surface by water
Stream washes away and rolled easily, influences Monitoring Data；The design combines monitoring point riverbed supporting course soil property situation, ensure that
In the case of scour depth is increased, the spherical heavy adaptive tracing of iron 2 washes away supporting course, passes through fiber bragg grating pressure sensor 4
Water, soil pressure are detected simultaneously, eliminates suspension mud and influence of the fluctuation in stage to flushing monitoring, is entered to washing away dynamic evolution under water
Row accurately monitoring analysis in real time.
The motion of current is likely to result in phenomenon of back-silting, according to the fiber grating pressure sensing 4 on known spherical heavy iron 2
Device and the monitoring reading of the miniature osmotic pressure sensor 3 of fiber grating and the spherical heavy tilt angle alpha of iron 2, are divided into following three kinds of situations
Calculate the buried depth of spherical heavy iron.i：Without the soil layer that back-silts on spherical heavy iron.
Monitoring device adaptive tracing supporting course, according to design in the case where no overlying back-silts soil, spherical heavy iron 2
Embedded depth is 10cm.
The monitoring reading p of the miniature osmotic pressure sensor 3 of fiber grating is taken, holding force layer surface can be derived to normal by formula once
The distance h of the water surface of water level,
p-Δps=γwhw
B=d-10
The formula of summary two can be released：
H=(p- Δs ps)/γw+b
P (Pa) in formula：The pressure readings of the miniature osmotic pressure sensor 3 of fiber grating；
γw(N/m3)：The effective unit weight of water；
d(m)：The radius of spherical heavy iron 2；
Δps：Variation in water pressure value caused by fluctuation in stage；
ii：There is the soil that back-silts on spherical heavy iron 2, but the soil thickness that back-silts is not enough to cover spherical heavy iron 2.
Because the thickness of the layer that back-silts is smaller, therefore its compactness is smaller, therefore on the basis of supporting course specific gravity of soil γ, it is right
It takes reduction coefficient β, the proportion for the soil that back-silted using β γ as overlying.
The reading of fiber bragg grating pressure sensor 4 more than the soil layer that back-silts is the numerical value of extraneous water pressure, is passed through
Following formula can release the depth of water of the sensor present position：
p2-Δps=γwhw2………④
Fiber bragg grating pressure sensor reading below the soil layer that back-silts is the combination of soil pressure and water pressure：
hw1=hw2+a………⑥
A=D sin α ... ... are 7.
It is comprehensive 4. 5. 6. 7., you can release sensor buried depth and spherical heavy iron buried depth：
z0=d (1-s in α)+z
In formula, p1(Pa)：The pressure readings of the fiber bragg grating pressure sensor 4 to back-silt below soil layer；
p2(Pa)：The pressure readings of the fiber bragg grating pressure sensor 4 to back-silt more than soil layer；
Δps：For variation in water pressure value caused by fluctuation in stage, on the basis of hydraulic pressure during ordinary water level；
c(Pa)：The cohesive strength of monitoring point supporting course soil, non-cohesive soil c=0；
Kp：Coulomb coefficient of passive earth pressure,
γw(N/m3)：The effective unit weight of water；
γ′(N/m3)：The effective unit weight of riverbed supporting course soil, takes γ '=β γ-γw；
D(m)：Spherical heavy iron diameter；
d(m)：Spherical heavy iron radius；
z(m)：Sensor buried depth；
z0(m)：Spherical heavy iron buried depth.
iii：Spherical heavy 2 are back-silted soil layer covering.
The thickness of the layer that considers to back-silt on spherical heavy iron 2 is larger, can use β=1, i.e., the spherical Soil Surrounding ratio of heavy iron 2 refetches
For γ.
The pressure number of degrees of Fiber bragg grating osmometer 3：
p3-Δps=γwhw3………③
hw1=hw3+a………⑨
A=d sin α ... ... are 10.
It is comprehensive 5. 8. 9. 10., you can release the sensor buried depth and the spherical heavy buried depth of iron 2：
z0=d (1-sin α)+z
P in formula1(Pa)：The pressure readings of the fiber bragg grating pressure sensor 4 to back-silt below soil layer；
p3(Pa)：The water pressure readings of the miniature osmotic pressure sensor 3 of optical fibre optical fibre grating；
Δps：Variation in water pressure value caused by fluctuation in stage, on the basis of hydraulic pressure during ordinary water level；
c(Pa)：The cohesive strength of monitoring point supporting course soil, non-cohesive soil c=0；
Kp：Coulomb coefficient of passive earth pressure,
γw(N/m3)：The effective unit weight of water；
γ′(N/m3)：The effective unit weight of riverbed supporting course soil, takes γ '=γ-γw；
D(m)：Spherical heavy iron diameter；
d(m)：Spherical heavy iron radius；
z(m)：Sensor buried depth；
z0(m)：Spherical heavy iron buried depth.
Comprehensive ii, iii, the distance h and the thickness of the layer t that back-silts of the water surface of ordinary water level to soil layer surface of back-silting：
H=hw1-z；
T=z0-10；
Monitoring device is thrown into the depth of water that the initial reading of sensor behind monitoring point releases and is designated as ID h0, by after
The counted depth of water is designated as h, then
H=h-h0；
In formula, H is the scoured pit's depth changing value monitored in real time required for monitoring device；
H and h0The influence of fluctuation in stage has been rejected, has been supporting course under ordinary water level or soil layer surface of back-silting to the water surface
Distance.
Monitoring method is as follows：
1) the miniature osmotic pressure sensor 3 of fiber grating monitors the change of extraneous water pressure in real time, and data are reached at data
Reason system 1.
2) fiber bragg grating pressure sensor 4, monitor the change of extraneous soil pressure and water pressure in real time, and data are reached into number
According to processing system 1.
3) gyroscope in spherical heavy iron 2 monitors the motion state of spherical heavy iron in real time, and data are reached into data processing
System 1.
4) data handling system 1, by the miniature osmotic pressure sensor 3 of fiber grating, fiber bragg grating pressure sensor 4 and gyroscope
The data of gained reach cloud database by being wirelessly transferred, the comparative analysis that computer is integrated to data and image, and
Calculated with reference to formula, you can to restore the real time status of pile foundation scour.
Claims (8)
1. a kind of bridge pile foundation washes away change real-time tracking monitoring system, including pile foundation and the bridge pier that is arranged in pile foundation, it is special
Sign is that the pier coping portion fixed setting data handling system (1), the opening position that the bridge pier is located at below the water surface, which is fixed, to be set
The miniature osmotic pressure sensor of fiber grating (3) is equipped with, is provided with the riverbed of the bridge pier bottom in the opening position close to pile foundation spherical
Heavy iron (2), spherical heavy iron (2) surface is provided with four fiber bragg grating pressure sensors (4) and a fiber grating is miniature
Osmotic pressure sensor (3), the spherical heavy iron (2) is internal to be equipped with fibre optic gyroscope；Locked at the top of the spherical heavy iron (2) by iron
Chain or steel wire are connected with pier coping portion；The miniature osmotic pressure sensor of fiber grating (3), fiber bragg grating pressure sensor
(4) and fibre optic gyroscope is connected by optical fiber data line with data handling system (1) circuit respectively.
2. a kind of bridge pile foundation according to claim 1 washes away change real-time tracking monitoring system, it is characterised in that described
Spherical heavy iron (2) is using a diameter of 28-32cm steel ball, and wall thickness 0.7-0.9cm, inside is hollow structure, and can be according to need
Extra pouring weight is added inside it；Spherical heavy iron (2) outer surface is provided with HCA-108 roofing acrylic acid water-repellent paints
Layer.
3. a kind of bridge pile foundation according to claim 1 washes away change real-time tracking monitoring system, it is characterised in that described
Embedded depth of the spherical heavy iron (2) on riverbed is 9-11cm.
4. a kind of bridge pile foundation according to claim 1 washes away change real-time tracking monitoring system, it is characterised in that described
Spherical heavy iron (2) is at least provided with one.
5. the monitoring side of change real-time tracking monitoring system is washed away according to a kind of any described bridge pile foundations of claim 1-4
Method, it is characterised in that comprise the following steps：
1) fluctuation of water level is monitored in real time by the miniature osmotic pressure sensor of the fiber grating being arranged on bridge pier (3)；Pass through setting
The miniature osmotic pressure sensor of fiber grating (3) on spherical heavy iron (2) monitors extraneous water pressure change；And by two sensorses data
Data handling system (1) is reached by optical fiber data line.
2) extraneous soil pressure and water pressure are monitored by fiber bragg grating pressure sensor (4) in real time, and data is passed through into fiber count
Data handling system (1) is reached according to line.
3) positioned by fibre optic gyroscope spherical heavy iron (2) rotational angle and the spherical heavy iron (2) of monitoring in current scour and
Rolling situation in scour hole forming process, and data are reached into data handling system (1) by optical fiber data line.
4) data handling system (1) to from the miniature osmotic pressure sensor of fiber grating (3), fiber bragg grating pressure sensor (4) and
Data analysis and mechanical analysis that the data of fibre optic gyroscope are integrated draw the real time status washed away.
6. a kind of bridge pile foundation according to claim 5 washes away the monitoring method of change real-time tracking monitoring system, it is special
Sign is, fiber bragg grating pressure sensor (4) data of the miniature osmotic pressure sensor of fiber grating (3) on the middle bridge pier with
Comparative analysis, influence of the SEA LEVEL VARIATION to pressure sensor caused by tide bulge and fall can be rejected.
7. a kind of bridge pile foundation washes away the monitoring method of change real-time tracking monitoring system, its feature according to claim 5
It is, the miniature osmotic pressure sensor of fiber grating (3) on the spherical heavy iron (2) and fiber bragg grating pressure sensor (4) data
Comparative analysis, back-silt the thickness of the layer and soil layer surface can be calculated to the distance of the water surface.
8. a kind of bridge pile foundation according to claim 5 washes away the monitoring method of change real-time tracking monitoring system, it is special
Sign is, the gyroscope in the spherical heavy iron (2) and any one fiber bragg grating pressure sensor (4) on spherical heavy iron (2)
Date comprision, the buried depth depth of corresponding fiber bragg grating pressure sensor (4) can be derived.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678034A (en) * | 2018-05-17 | 2018-10-19 | 浙江工业大学 | A kind of monitoring method based on cube bridge foundation washout safety monitoring assembly |
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