CN104532883B - A kind of monitoring method of pile foundation concreting - Google Patents
A kind of monitoring method of pile foundation concreting Download PDFInfo
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- CN104532883B CN104532883B CN201410709205.7A CN201410709205A CN104532883B CN 104532883 B CN104532883 B CN 104532883B CN 201410709205 A CN201410709205 A CN 201410709205A CN 104532883 B CN104532883 B CN 104532883B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- 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
The present invention relates to a kind of monitoring method of pile foundation concreting, comprise the following steps：1) measure the change of the temperature and pressure of tested pile foundation in real time by fiber-optic grating sensor, and produce the spectral wavelength variable quantity of temperature and pressure respectively；2) the spectral wavelength variable quantity for demodulating temperature and pressure by analyzer obtains the delta data of temperature and pressure, by this data transfer to computer monitoring center, and is shown by display device；3) computer sets up 3D geometrical models by FEM-software ANSYS to concreting scene pile foundation to be tested；4) delta data of temperature and pressure is imported into the 3D geometrical models of tested pile foundation, obtains the 3D dynamic models of the temperature and pressure of tested pile foundation；5) the live pile foundation of concreting is monitored in real time by being tested the delta data of temperature and pressure and the 3D dynamic models of temperature and pressure of pile foundation.Compared with prior art, the present invention has the advantages that visual pattern, safe and reliable, Realtime Alerts.
Description
Technical field
The present invention relates to concreting field, more particularly, to a kind of monitoring method of pile foundation concreting.
Background technology
The problem of needing to solve at present, how effectively temperature and strain monitoring are always in large-sized concrete casting process
The temperature field of its process of setting and the distribution character of stress field are detected, the quality for concrete pouring construction is of crucial importance, carries
Operation maintenance and safety and stability production of the pouring quality of high concrete for the later stage are all most important.Therefore, for city
The health monitoring of temperature and stress in the construction of underground substation can also serve as a research problem.
In the 1980s, optical fiber sensing technology is rapidly developed in developed country, various fibre optical sensors are with it
Unique technical advantage is widely used in the every field such as national defence, Aero-Space, industry, communications and transportation and daily life.Building
Build thing square foundation upwards, Baldwin and Woojin Lee et al. are successively carried out using fibre optical sensor to live pile foundation test
Temperature, strain monitoring, and the character such as load-bearing deformation, load transmission of stake to analysis on monitoring result.In China, to fiber grating
The research of sensing technology is also taken seriously, and the research work of this respect has been begun to from the end of the seventies in last century.In recent years, optical fiber
Sensing technology reaches its maturity, and the monitoring instrument based on the technological development is corrosion-resistant not by electromagnetic interference, and integration is strong, there is good
Good precision and stability, thus largely compensate for the deficiency of traditional monitoring technology.Optical fiber sensing technology has been included in
State key research project, fiber grating sensing technology can be widely applied to the temperature of various occasions, such as bridge, colliery, tunnel
Automatic alarm control system, the dynamic on-line monitoring and fire alarm of oil depot, dangerous goods store, cargo ship etc..At present in electric power side
Face, fiber-optic grating sensor is mainly used in the monitoring internal temperature of intelligent substation high-tension switch cabinet, in electric power heavy construction
Utilization in structure construction is actually rare, while 3D analogue techniques also seldom occur in power industry.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of visual pattern, safety
Reliably, the monitoring method of the pile foundation concreting of Realtime Alerts.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of monitoring method of pile foundation concreting, comprises the following steps：
1) by the temperature for the tested pile foundation of fiber-optic grating sensor measurement in real time being arranged in the live pile foundation of concreting
The change of degree and pressure, and the spectral wavelength variable quantity of temperature and pressure is produced respectively；
2) the spectral wavelength variable quantity for demodulating temperature and pressure by analyzer obtains the delta data of temperature and pressure, will
This data transfer is shown to computer monitoring center, and by display device；
3) computer monitoring center is according to the delta data of temperature and pressure, by finite element analysis software ANSYS to mixed
Solidifying soil pours scene pile foundation to be tested and sets up 3D geometrical models；
4) delta data of temperature and pressure is imported into the 3D geometrical models of tested pile foundation, obtains the temperature of tested pile foundation
The 3D dynamic models of degree and pressure；
5) by be tested pile foundation temperature and pressure delta data and temperature and pressure 3D dynamic models to coagulation
Soil pours live pile foundation and monitored in real time, and is alarmed after delta data exceedes threshold value.
Described step 1) in spectral wavelength variable quantity calculating formula be：
ΔλB=Δ λB ΔT+ΔλB ε=cTλB0ΔT+cελB0ε
Wherein, Δ λBIt is the variable quantity of centre wavelength；λB0For the initial center wavelength of optical fiber；Δ T and ε are optical fiber institute respectively
By temperature and stress variation；neff, α and ψ be respectively optical fiber strain optical coefficient, thermal coefficient of expansion and thermo-optical coeffecient, Δ λB ΔTWith
ΔλB εCentre wavelength drift value, c respectively caused by temperature and strainε=0.78 × 10-6(με)-1, cT=6.67 × 10-6
℃-1。
Described step 3) specifically include following steps：
31) according to the size of actual monitoring pile foundation, the 3D chis of tested pile foundation are designed in finite element analysis software Ansys
It is very little；
32) in the Geometry modules in finite element analysis software Ansys, according to the tested pile foundation concrete dense in scene
Degree, initial thermal load conditions and heat exchange method, generate the 3D geometrical models of tested pile foundation temperature field and stress field respectively.
Described step 4) specifically include following steps：
41) particular location of the fiber-optic grating sensor in tested pile foundation is obtained, and marks out to come in 3D geometrical models；
42) the fiber-optic grating sensor position come according to marking out, by the delta data of tested pile foundation temperature and pressure work
On the correspondence position for being added to 3D geometrical models for load；
43) real-time update is tested the delta data of the temperature and pressure of pile foundation, repeat step 42) obtain the temperature of tested pile foundation
The dynamic 3D data models of degree and pressure.
Described analyzer is that FBG analyzes (FBG) demodulator.
Described fiber-optic grating sensor includes fiber-optical grating temperature sensor and fiber Bragg grating strain sensor.
Compared with prior art, the present invention has advantages below：
First, visual pattern, the present invention is effectively combined optical fiber grating sensing data collecting system and 3D simulation systems
Together so that field personnel it is more visual in image observe concreting situation, make result more authentic and valid.
2nd, it is safe and reliable, by the fiber-optic grating sensor gathered data at scene, gathered than general by operating personnel
The data arrived are relatively reliable, while making the safety of the operating personnel at scene be protected.
3rd, Realtime Alerts, according to the dual monitoring of data system and 3D systems, design threshold, and are alarmed in time,
It ensure that the quality of execute-in-place.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Fig. 2 changes over time curve map for the temperature of the present invention.
Fig. 3 changes over time curve map for the stress of the present invention.
Fig. 4 changes 3D simulation drawings for the temperature transient of the present invention.
Fig. 5 is stress transient changing 3D simulation drawings of the invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
As shown in figure 1, a kind of monitoring method of pile foundation concreting, comprises the following steps：
1) passed by the fiber-optical grating temperature sensor and fiber grating strain that are arranged in the live pile foundation of concreting
The change of the temperature and pressure of the tested pile foundation of sensor measurement in real time, and the spectral wavelength variable quantity of generation temperature and pressure respectively,
Spectral wavelength variable quantity calculating formula is：
ΔλB=Δ λB ΔT+ΔλB ε=cTλB0ΔT+cελB0ε
Wherein, Δ λBIt is the variable quantity of centre wavelength；λB0For the initial center wavelength of optical fiber；Δ T and ε are optical fiber institute respectively
By temperature and stress variation；neff, α and ψ be respectively optical fiber strain optical coefficient, thermal coefficient of expansion and thermo-optical coeffecient, Δ λB ΔTWith
ΔλB εCentre wavelength drift value, c respectively caused by temperature and strainε=0.78 × 10-6(με)-1, cT=6.67 × 10-6
℃-1；
2) change of temperature and pressure is obtained by the FBG spectral wavelength variable quantities for analyzing (FBG) demodulator demodulation temperature and pressure
Data, by this data transfer to computer monitoring center, and are shown by display device；
3) computer monitoring center is according to the delta data of temperature and pressure, by finite element analysis software ANSYS to mixed
Solidifying soil pours scene pile foundation to be tested and sets up 3D geometrical models, specifically includes following steps：
31) according to the size of actual monitoring pile foundation, the 3D sizes of tested pile foundation are designed in finite element analysis software Ansys；
32) in the Geometry modules in finite element analysis software Ansys, according to the tested pile foundation concrete dense in scene
Degree, initial thermal load conditions and heat exchange method, generate the 3D geometrical models of tested pile foundation temperature field and stress field respectively；
4) delta data of temperature and pressure is imported into the 3D geometrical models of tested pile foundation, obtains the temperature of tested pile foundation
The 3D dynamic models of degree and pressure, specifically include following steps：
41) particular location of the fiber-optic grating sensor in tested pile foundation is obtained, and marks out to come in 3D geometrical models；
42) the fiber-optic grating sensor position come according to marking out, by the delta data of tested pile foundation temperature and pressure work
On the correspondence position for being added to 3D geometrical models for load；
43) real-time update is tested the delta data of the temperature and pressure of pile foundation, repeat step 42) obtain the temperature of tested pile foundation
The dynamic 3D data models of degree and pressure；
5) by be tested pile foundation temperature and pressure delta data and temperature and pressure 3D dynamic models to coagulation
Soil pours live pile foundation and monitored in real time, and is alarmed after delta data exceedes threshold value.
The system is effectively combined both temperature, stress data monitoring system and Three Dimensional Dynamic Simulation system, can
More visually to show that parameters when large-sized concrete is poured are built in underground substation to site operation personnel.Work as display
When data are undergone mutation, personnel can be reminded to have abnormal conditions appearance in time.
In large-sized reinforced concrete casting process, using fiber-optic grating sensor collection because temperature and stress change
Caused spectral wavelength variable quantity, then (FBG) demodulator obtains corresponding data volume by analysis, then is uploaded to by communications optical cable
Computer monitoring center, checks real time data variable quantity from man-machine interface.In addition, soft using finite element analysis in a computer
Part ANSYS sets up 3D models to temperature field and stress field, and load is added in respective nodes, load capacity according to the temperature that has gathered and
Stress data, then dynamic analog job site scene.Both collection monitoring system and 3D simulation systems are combined, in meter
Generator terminal observation match condition is calculated, allows staff is more visual in image, monitoring objective result is accurately shown, such as abnormal conditions
Can in time be found, send early warning, workmen makes corresponding remedial measure, thus improve the efficiency of construction, safety and can
By property.
Fiber-optic grating sensor is irradiated on bare fibre using ultraviolet light by grating, causes bare fibre fiber core refractive index
Permanent change, forms Bragg grating；When by temperature or stress variation, the pitch of grating changes simultaneously, so that
Accurately measurement temperature or strain.Different measuring environments are applicable to, long term monitoring is can not only be used for, it can also be used to short-term prison
Survey, and may be reused.
Fiber grating is a kind of sensing technology based on Bragg grating reflection specific wavelength light characteristic, when broadband incident light
During into optical fiber, fiber grating can reflect the light of specific wavelength, generate reflectance spectrum.
Optical fiber grating sensing is a kind of excellent temperature and strain sensing technology, based on current demodulation techniques, optical fiber light
Grid temperature, strain detecting precision can reach 0.1 DEG C and 1 μ ε.In addition, wavelength separated multiplexing technology (WDM, Wavelength
Division Multiplex) fiber grating is used in series, realize distributed monitoring.
Monitoring sensor is based on Fiber Bragg Grating technology, so can use welding or FC/ between any sensor
APC optic splices are realized and connected two-by-two.By rational cabling scenario, all the sensors can be integrated into the distributed sensing of chain type
Sequence.In every sensing sequence, the centre wavelength of each fiber grating must mutually keep certain safe distance, in order to avoid read
Count the phenomenon that overlaps.
Fiber-optic grating sensor is illustrated as properly seated on reinforcing bar according to rational deployment, is connected two-by-two after welding
Come, the change wavelength collected is then uploaded into FBG (FBG) demodulators by optical cable connecting box and communications optical cable and handled.For
The fiber grating distributed sensing sequence of series connection, (FBG) demodulator is successively read the middle cardiac wave of each sensor according to order from small to large
It is long, and data acquisition computer is sent the data to by connected modes such as wired ethernet, serial ports.Computer is by observation interface
Show in real time, and realize the functions such as real-time query, purpose monitoring process.In addition whole monitoring system can also be by setting
Put threshold value addition warning function.
The fiber-optic grating sensor specification index that monitoring system of the present invention is used as shown in table 1, optical fiber grating temperature and should
Become sensor and meet job site actual conditions, so that more corresponding data are passed through optical cable transmission to computer
Surveillance center end.
The fiber-optic grating sensor specification index of table 1
As shown in Figure 4 and Figure 5, data are obtained after the corresponding spectrum of fiber-optic grating sensor collection is demodulated and upload to meter
Calculation machine client, the change that temperature and stress when observing monitoring field concreting at any time occur.It is existing that we choose construction
The Monitoring Data of some day shows that Various types of data collection in every 10 minutes is once.
In terms of temperature, Stress calculation, current unit in charge of construction is mostly using restraining force and outer constraint in formula separate computations
Power, but this can not reflect that large-sized concrete pours temperature, stress distribution everywhere.Utilize finite element analysis software
ANSYS is analyzed, then can obtain the distribution than more comprehensive Temperature Field in Bulky Concrete and stress field.
ANSYS software functions are powerful, and coverage is wide, are a kind of molten bonding structure, fluid, electric field, magnetic field, Analysis of The Acoustic Fields in one
The large-scale general finite element analysis software of body.The plane and space that ANSYS thermal analysis module can be constituted to various materials are tied
Structure carries out heat analysis, and temperature field caused by the heat of hydration and stress field are carried out when the present invention is poured using its feature to large-sized concrete
Modeling and analysis.
The present invention is directly carried out three-dimensional several using the Geometry modules in finite element analysis software Ansys Workbeach
What is modeled.After being verified by grid independence, integrated use steady-state thermal analysis, Transient Thermal Analysis and static structure analyze three
Module, the temperature that respective sensor is gathered and stress data are imported in a tabular form, are applied in structure, are obtained as thermal force
Changed with time to structure temperature, stress field.A certain moment transient state is shown as shown in Figures 2 and 3.
In terms of Fibre Optical Sensor, fiber grating is that sensing technology opens a new Applied research fields.The system is adopted
The measurement of the parameters such as temperature, stress is realized with appropriate encapsulation technology, and using ANSYS softwares to its temperature field and stress
Field carries out 3D dynamic analogs.Engineering structure medium-and-large-sized to power system carries out real time health monitoring, and structural damage is recognized in time, right
The disaster being likely to occur gives warning in advance, and has great scientific meaning to the safety and reliability for improving structure and significantly should
With value.
Claims (3)
1. a kind of monitoring method of pile foundation concreting, it is characterised in that comprise the following steps：
1) by be arranged on the tested pile foundation of the measurement in real time of the fiber-optic grating sensor in the live pile foundation of concreting temperature and
The change of pressure, and respectively produce temperature and pressure spectral wavelength variable quantity, described step 1) in spectral wavelength variable quantity
Calculating formula is：
ΔλB=Δ λB ΔT+ΔλB ε=cTλB0ΔT+cελB0ε
Wherein, Δ λBIt is the variable quantity of centre wavelength；λB0For the initial center wavelength of optical fiber；Δ T and ε are warm suffered by optical fiber respectively
Degree and stress variation；neff, α and ψ be respectively optical fiber strain optical coefficient, thermal coefficient of expansion and thermo-optical coeffecient, Δ λB ΔTWith Δ λB ε
Centre wavelength drift value, c respectively caused by temperature and strainε=0.78 × 10-6(με)-1, cT=6.67 × 10-6℃-1；
2) the spectral wavelength variable quantity for demodulating temperature and pressure by analyzer obtains the delta data of temperature and pressure, and this is counted
According to being transferred to computer monitoring center, and shown by display device；
3) computer monitoring center is according to the delta data of temperature and pressure, by finite element analysis software ANSYS to concrete
Pour scene pile foundation to be tested and set up 3D geometrical models, described step 3) specifically include following steps：
31) according to the size of actual monitoring pile foundation, the 3D sizes of tested pile foundation are designed in finite element analysis software Ansys；
32) in the Geometry modules in finite element analysis software Ansys, according to the tested pile foundation concrete density in scene, just
Beginning thermal load conditions and heat exchange method, generate the 3D geometrical models of tested pile foundation temperature field and stress field respectively；
4) delta data of temperature and pressure is imported into the 3D geometrical models of tested pile foundation, obtain tested pile foundation temperature and
The 3D dynamic models of pressure, described step 4) specifically include following steps：
41) particular location of the fiber-optic grating sensor in tested pile foundation is obtained, and marks out to come in 3D geometrical models；
42) according to mark out come fiber-optic grating sensor position, regard the delta data of tested pile foundation temperature and pressure as load
Lotus is added on the correspondence position of 3D geometrical models；
43) real-time update is tested the delta data of the temperature and pressure of pile foundation, repeat step 42) obtain tested pile foundation temperature and
The dynamic 3D data models of pressure；
5) concrete is poured by being tested the delta data of temperature and pressure and the 3D dynamic models of temperature and pressure of pile foundation
Build live pile foundation to be monitored in real time, and alarmed after delta data exceedes threshold value.
2. a kind of monitoring method of pile foundation concreting according to claim 1, it is characterised in that described analyzer
(FBG) demodulator is analyzed for FBG.
3. a kind of monitoring method of pile foundation concreting according to claim 1, it is characterised in that described optical fiber light
Gate sensor includes fiber-optical grating temperature sensor and fiber Bragg grating strain sensor.
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| CN105064420A (en) * | 2015-08-06 | 2015-11-18 | 交通运输部天津水运工程科学研究所 | High-pile wharf foundation pile damage diagnosis method based on structural residual modal force |
| CN110580740B (en) * | 2019-08-27 | 2021-08-20 | 清华大学 | Multi-agent cooperative three-dimensional modeling method and device |
| CN110725347A (en) * | 2019-10-22 | 2020-01-24 | 上海中兴思秸通讯有限公司 | Real-time detection method and system for broken pile in concrete cast-in-place pile construction process |
| CN111010440A (en) * | 2019-12-18 | 2020-04-14 | 中交第三航务工程局有限公司南京分公司 | Concrete pouring digital monitoring management system |
| CN111733787B (en) * | 2020-05-14 | 2021-12-03 | 中电建路桥集团有限公司 | Method and system for detecting karst cave treatment effect in bridge pile foundation construction process |
| CN117538289B (en) * | 2024-01-10 | 2024-03-22 | 中铁十六局集团第一工程有限公司 | Nondestructive testing method for construction quality of steel reinforced concrete structure node |
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| KR20060042611A (en) * | 2004-11-10 | 2006-05-15 | 대림산업 주식회사 | Array with a built-in multi-point fiber bragg grating(fbg) sensor for the strain measurement of concrete piles |
| CN103123252B (en) * | 2012-02-10 | 2015-08-05 | 南京大学 | Duct pieces of shield tunnel back synchronous injection many reference amounts real-time monitoring system |
| CN102928580B (en) * | 2012-11-20 | 2014-11-05 | 郑州大学 | Corrosion monitoring device and method for reinforcement bar in concrete structure |
| CN203432545U (en) * | 2013-08-21 | 2014-02-12 | 合肥容知测控仪器有限公司 | Fiber-bragg-grating concrete-surface-mounted strain sensing system |
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