CN104165899B - A kind of mass concrete temperature diffusivity on-site measurement device and assay method - Google Patents
A kind of mass concrete temperature diffusivity on-site measurement device and assay method Download PDFInfo
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Abstract
The present invention relates to a kind of mass concrete temperature diffusivity on-site measurement device and assay methods, belong to architectural design and construction field.Heat source module is arranged in detected concrete, and temperature measurement module is arranged in the surrounding of heat source module, and heat source module is connected with temperature measurement module with control module respectively.A kind of mass concrete temperature diffusivity on-site measurement device and assay method provided by the invention, directly carry out the on-site measurement of concrete temperature diffusivity in actual interior of building, and reliability is high.Influence of the previous test method(s) due to that can not reflect live enchancement factor, and sample dimensions and actual building gap are again very big, therefore be difficult to accomplish to keep parameter consistent with actual concrete.This method directly carries out on-site measurement in itself to building, and precision is higher.
Description
Technical field
The present invention relates to a kind of mass concrete temperature diffusivity on-site measurement device and assay methods, belong to architectural design
With construction field.
Background technology
In the large-sized concretes Structural Engineering such as hydraulic engineering, civil engineering, concrete temperature variation to displacement structure and
Stress etc. has a significant impact, and temperature diffusivity is then to influence one of concrete temperature field and the key parameter of temperature stress calculation.
Therefore, needs are calculated in order to meet mass concrete temperature stress and meets the need of Concrete temperature controlling scheme implementation
It asks, should try one's best and accurate concrete temperature diffusivity is provided.
Currently used mass concrete temperature diffusivity is determined there are three types of methods.First, using test value, i.e. basis is set
Meter scheme, making and the close concrete sample of on-site concrete ingredient, apply it certain boundary condition, use apparatus measures
Its temperature diffusivity.The limitation of the method is costly, and sample dimensions can not be big, when on-site concrete is there are during big aggregate,
Experiment, there are notable difference, can not also reflect the randomness or uncertainty of site operation, cause to be surveyed usually with field condition
Temperature diffusivity is often larger with actual variance.Second is that rule of thumb value, since inside and outside portion's condition of each engineering is different,
Therefore empirical equation can only at most provide an estimated value substantially, it is impossible to accurate description.Third, according to observed temperature data
Inverting, the concrete scope involved by this method is usually larger, and the temperature count number being related to is more, is readily incorporated observation error,
Requirement to boundary condition and primary condition is higher, and it is more difficult to obtain accurate temperature diffusivity value, Inversion Calculation work
Amount is also big.
The content of the invention
The present invention provides a kind of mass concrete temperature diffusivity on-site measurement device and measure side against the above deficiency
Method.
The following technical solution of the present invention：
A kind of mass concrete temperature diffusivity on-site measurement device of the present invention, including heat source module, thermometric mould
Block, control module；The heat source module is arranged in detected concrete, and temperature measurement module is arranged in the surrounding of heat source module, heat
Source module is connected with temperature measurement module with control module respectively.
Mass concrete temperature diffusivity on-site measurement device of the present invention, the heat source module include metal
Ball, heating wire, thermometer；Arrangement heating wire and thermometer in the metal ball.
Mass concrete temperature diffusivity on-site measurement device of the present invention, the temperature measurement module are mixed including internal layer
Solidifying soil thermometer, outer concrete thermometer；The internal layer concrete temperature meter and outer concrete thermometer are with heat source
Into circular arrangement centered on module.
Mass concrete temperature diffusivity on-site measurement device of the present invention, the internal layer mixed mud thermometer with
The distance of outer concrete thermometer and metal ball respectively may be about twice and four times of metal bulb diameter.
Mass concrete temperature diffusivity on-site measurement device of the present invention, the control module are adopted including temperature
Collect module and circuit control module；The temperature collecting module connects internal layer concrete temperature meter, outer concrete temperature respectively
Degree meter；Circuit control module is connected with the heating wire in metal ball.
The assay method of mass concrete temperature diffusivity on-site measurement device of the present invention, step are as follows：
1）, after concrete graded layer is poured into the predetermined position for installing this test device, it is hard in the storehouse surface concrete setting
A round pool similar to metal ball size is excavated before changing at its center, the metal ball that installation is complete will be prepared and be put into round pool
In, and fill concrete makes its closely knit；
2）, concrete storehouse surface in step 1 is poured again, after the completion for the treatment of that all concrete all pour, between controlling
Heating wire in metal ball is opened in disconnection, passes through metal ball outwardly heat conduction；Pass through internal layer concrete temperature meter and outer concrete temperature
Degree collects the temperature change of collection different position；
3）, the temperature reading that measures to temperature reading, the internal layer concrete temperature in metal ball and outer concrete temperature
It spends the temperature reading measured to be compared, after excluding gross error data, obtains the average value of three groups of temperature, be denoted as respectively、、；
In above-mentioned symbolRepresent temperature,Represent the time, c represents the position of concrete exospheric temperature meter, and b represents coagulation
The position of native internal layer thermometer, thermometer position in a metal balls；
（Note：It is function notation, represents temperature Place is at any timeVariation, in other wordsThe temperature at placeIt is at any timeVariation）
4）, according to the average value of above-mentioned temperature, withWithAs calculation of boundary conditions, withFor target temperature
Degree carries out temperature diffusivity Inversion Calculation by equation below, obtains the temperature diffusivity of concrete。
In above formula,It represents to calculate obtained thermometer by the methods of finite element in internal layer thermometer position
Calculation value.
Advantageous effect
A kind of mass concrete temperature diffusivity on-site measurement device and assay method provided by the invention, directly in reality
Interior of building carries out the on-site measurement of concrete temperature diffusivity, and reliability is high.Previous test method(s) is due to that can not reflect scene
The influence of enchancement factor, and sample dimensions and actual building gap are again very big, therefore be difficult to accomplish to keep with actual concrete
Parameter is consistent.This method directly carries out on-site measurement in itself to building, and precision is higher.
Testing equipment and material are saved, reduces cost, it is time saving and energy saving.Concrete examination will be fabricated separately using test method(s)
Part is, it is necessary to special experimental enviroment and testing equipment.And this method carries out directly in building, saves these additional throwings
Money.
Simple, convenient, technology requirement is low.Previous test method(s) will carry out test specimen making, maintenance, experimental situation control
The a series of complex process such as system, equipment installation preparation, technology requirement are high.This method measuring instrument is installed in the construction process, peace
Dress process is simple, may be repeated test later, implementation process is simple.
The measure cycle is short, improves work efficiency.In the past according to the method for observed temperature Data Inversion, the temperature of concrete
Variation is controlled by hydration heat of cement and border temperature, in order to obtain temperature change by a relatively large margin to ensure precision, is at least needed
The time of some months is observed, observation cycle is long.Test only needs can complete for 2~3 days to this method every time, improves work effect
Rate.
Calculate simple, measuring accuracy height.In the past according to the method for observed temperature Data Inversion, since physical condition is complicated,
There are various uncertain factors, therefore measured data regularity is often poor, affects precision, moreover, the scope of research object
Typically whole building, the heavy workload of Inversion Calculation.And heart local location carries out assay method of the present invention between floors,
Research object scope is small, and geometric shape is simple, and boundary condition is clear and definite, therefore calculation amount is small；Simultaneously as minute is short, because
The influence of this negligible hydration heat of concrete simplifies calculating analysis.Above-mentioned advantage causes measuring accuracy to significantly improve.
Description of the drawings
Fig. 1 is that the device of the invention buries scheme schematic diagram；
Fig. 2 is the module connection arrangement schematic diagram of the present invention；
1-1 is metal ball in figure, and 1-2 is heating wire, and 1-3 is thermometer, and 2-1 is internal layer concrete temperature meter, 2-2
It is outer concrete thermometer, 3-1 is temperature acquisition submodule, and 3-2 is circuit control submodule, and 4-1 is power supply, and 4-2 is
Feed cable, 4-3 are Cables for Dam Observation；5 be concrete.
Specific embodiment
The present invention is described in more detail below in conjunction with the accompanying drawings：
As shown in the figure：A kind of mass concrete temperature diffusivity on-site measurement device, including heat source module, temperature measurement module,
Control module；Heat source module is arranged in detected concrete, and temperature measurement module is arranged in the surrounding of heat source module, and heat source module is with surveying
Warm module is connected respectively with control module.Heat source module includes metal ball, heating wire, thermometer；Arrangement heating wire in metal ball
With thermometer.Heat source module makes metal ball and surrounding concrete gradually rise using the heating wire in field power supply heating metal ball
Temperature, heat fades away after stopping heating, and temperature is gradually restored to the state before heating；The effect of metal ball is to be using metal
This feature of the good conductor of heat forms the heat source border of isothermal, to ensure that even heat is diffused into concrete；In metal ball
Thermometer is used to observe and grasp the temperature of metal ball.
Heat source module shape is the aluminum metal ball of 3 millimeters of wall thickness, about 30 centimetres of the diameter of ball, be equipped in ball heating wire and
1~2 thermometer.Heating wire generates heat using field power supply and concrete is made to heat up, and aluminum metal ball can ensure heat
Amount is uniformly transmitted in concrete；Thermometer in metal ball is used to measure the temperature of metal ball in itself, the temperature measured
On the one hand it is used for controlling the heating time of resistance wire, temperature is avoided to rise excessive and generate unfavorable local stress in concrete, together
When be also one of boundary condition of temperature diffusivity parametric inversion computing object.
Temperature measurement module includes internal layer mixed mud thermometer, outer concrete thermometer；The internal layer mixed mud thermometer
It is arranged centered on heat source module into the center of circle；Outer concrete thermometer is arranged centered on heat source module into the center of circle.Concrete
Temperature measurement module is several including thermometer, and all thermometers are arranged on two circle concentric circles in same level, center of circle position
In the centre of sphere of metal ball.Wherein, about 4 times of metal bulb diameters of outer radii, about 2 times of metal radiuses of a ball of inner radii, often circle is uniform
Arrange 3~4 thermometers.In above-mentioned thermometer, outer ring measured temperature average value is used as the boundary condition of temperature diffusivity inverting；It is interior
Enclose the target temperature that thermometer average value is used as temperature diffusivity inverting.
Concrete shell between spherical surface where metal ball and outer layer concentric circles utilizes unstable temperature as analysis object
It is theoretical to spend field computation, Inversion Calculation obtains the temperature diffusivity of concrete.
Device is to be embedded in Practical Project concreting process in concrete, is a kind of on-site measurement method.
Moreover, burial place is close proximity in the centre of mass concrete, to reduce building boundary condition to observing position
Temperature profile effect.The embedded method buried using digging of measuring device, also can be selected other construction methods.
The mass concrete temperature diffusivity on-site measurement device and test method step of the present invention is as follows：
The first step, the Embedded installation of measurement device.Method is buried using digging, it is specific as follows：First, when concrete 5 is poured into
After near the design and installation position of test device（One specific storehouse surface such as usual is poured after completion）, hardened in concrete setting
Before, needing embedded metal ball 1-1 with scoop（Including built-in heating wire 1-2 and thermometer 1-3）With 2-1,2-2, thermometer
Put the slot 5-1 for digging out suitable size；Then, metal ball 1-1 and concrete temperature meter 2-1,2-2 and cable 4-2,4-3 are buried
Enter in slot, fill concrete and slight vibration compacting, it is ensured that tight between test component and concrete；Finally, test
Property observation worked normally with ensuring each component of instrument, and feed cable 4-2 and Cables for Dam Observation 4-3 are protected, upper strata are avoided to mix
Solidifying soil is damaged when pouring.
Second step, after concrete all pours completion and setting and hardening, manual change's concrete temperature field is simultaneously seen
It surveys.First, the temperature of each thermometer is recorded, is averaged temperatureAs analysis object（Metal ball 1-1 and outer concrete temperature
Concrete shell between spherical surface where degree meter 2-2）Initial temperature.Then, heating wire 1-2 is heated using field power supply 4-1,
Make temperature quickly 10 DEG C of the rise of metal ball 1-1, i.e., temperature reaches, utilize the circuit submodule in control module
Block 3-1 and thermometric submodule 3-2, makes the temperature of metal ball 1-1 remain unchanged substantially, when so maintenance 6 is small；Stop heating afterwards
6 it is small when, the temperature of concrete 5 will be gradually reduced；Then the temperature of metal ball 1-1 is made quickly to raise again to return toAnd maintenance 6 is small
When.So be repeated, when 48 is small after stop experiment.During experiment, the temperature in control module was utilized every 10 minutes
Acquisition submodule 3-2 automatic Observations simultaneously record the measured value of each temperature point.
3rd step observes data processing.Thermometer 1-3 in metal ball is compiled as one group, the thermometer 2-1 in concrete
It compiles as second group, the thermometer 2-2 in concrete is compiled as the 3rd group, and after rejecting there are the data of obvious errors, each group temperature is obtained
Degree meter is in synchronizationAverage value.Three groups of thermographs are thus obtained, are named as、、。
In above-mentioned symbolRepresent temperature,Represent the time, c represents the position of concrete exospheric temperature meter, and b represents coagulation
The position of native internal layer thermometer, thermometer position in a metal balls；
（Note：It is function notation, represents temperature Place is at any timeVariation, in other wordsThe temperature at place
DegreeIt is at any timeVariation）
4th step, temperature diffusivity inverting.Although this problem is three dimensions temperature field problem, due to raw in the present invention
Into temperature field be considered as spherically symmetric, therefore one-dimensional spherically symmetric problem can be reduced to and solved, the equation of heat conduction is：
；
Primary condition is；Boundary condition is,。
Wherein,For the time,For radius,It representsMoment radiusThe concrete temperature at place,For metal ball half
Footpath,The circular radius where outer concrete thermometer.The object function of inverting is,
I.e. the average observed temperature of internal layer concrete temperature meter and the error sum of squares of calculated value reach minimum, hereinIncluding expression
Layer thermometer position calculates obtained temperature calculations by the methods of finite element.The above problem is one simply without about
Beam extreme-value problem utilizes one-dimensional difference or finite element combination optimal method（Such as variable-metric method, neural network algorithm）Hold very much
Easily solve.For example, when using one-dimensional finite element combination BP neural network algorithm, One Dimensional Finite meta-model is initially set up, is calculated
In different temperature diffusivitys and given primary condition, boundary conditionWithUnder, it is warm at internal layer concrete temperature meter 2-1
The evolution of degree, as the input data of train samples, using each temperature diffusivity as the phase of neutral net
Hope output valve, training network.After network training is good, by the temperature measured value of corresponding measuring pointIt is input to trained network
In, extensive output is carried out, the network output obtained at this time is the concrete temperature diffusivity of wanted inverting。
Claims (3)
1. a kind of mass concrete temperature diffusivity on-site measurement device, it is characterised in that：Including heat source module, temperature measurement module,
Control module；The heat source module is arranged in detected concrete, and temperature measurement module is arranged in the surrounding of heat source module, heat source mould
Block is connected with temperature measurement module with control module respectively；The heat source module includes metal ball, heating wire, thermometer；Described
Arrangement heating wire and thermometer in metal ball；The temperature measurement module includes internal layer concrete temperature meter, outer concrete temperature
Meter；The internal layer concrete temperature meter and outer concrete thermometer are centered on heat source module into circular arrangement；It is described
Internal layer concrete temperature meter and outer concrete thermometer and the distance of metal ball be respectively twice and four of metal bulb diameter
Times.
2. mass concrete temperature diffusivity on-site measurement device according to claim 1, it is characterised in that：The control
Molding block includes temperature collecting module and circuit control module；The temperature collecting module connects internal layer concrete temperature respectively
Meter, outer concrete thermometer；Circuit control module is connected with the heating wire in metal ball.
3. utilize the survey of the mass concrete temperature diffusivity on-site measurement device described in 1 to 2 any one of the claims
Determine method, it is characterised in that：Step is as follows：
1）, after concrete graded layer is poured into the predetermined position for installing this test device, before storehouse surface concrete setting hardening
The center excavates a round pool similar to metal ball size, will prepare the metal ball that installation is complete and is put into round pool, and returns
Filling out concrete makes its closely knit；
2）, concrete storehouse surface in step 1) is poured again, after the completion for the treatment of that all concrete all pour, discontinuity control
Heating wire in opening metal ball passes through metal ball outwardly heat conduction；Pass through internal layer concrete temperature meter and outer concrete temperature
Collect the temperature change of collection different position；
3）, the temperature reading that measures to temperature reading, the internal layer concrete temperature in metal ball and outer concrete thermometer
The temperature reading measured is compared, and after rejecting wrong data, obtains the average value of three groups of temperature, is denoted as respectively、、；
4）, according to the average value of above-mentioned temperature, withWithAs calculation of boundary conditions, withFor target temperature, lead to
It crosses equation below and carries out temperature diffusivity Inversion Calculation, obtain the temperature diffusivity of concrete,It represents in internal layer thermometer
Position calculates obtained temperature calculations by finite element method：
, in formulaFor the time,For radius,It representsMoment radiusPlace
Concrete temperature；
。
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| CN110516405B (en) * | 2019-09-11 | 2023-04-18 | 新疆农业大学 | Construction method of hydration heat presumption-free prediction model of portland cement-based cementing material system |
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| CN201955318U (en) * | 2011-01-11 | 2011-08-31 | 河海大学 | High-accuracy device for measuring the coefficients of temperature conductivity and heat conductivity of early concrete simultaneously |
| CN101936932B (en) * | 2010-02-02 | 2012-07-18 | 国网电力科学研究院 | Measuring probe of soil thermal resistivity based on point heat source method |
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| SU1163233A1 (en) * | 1983-06-02 | 1985-06-23 | Научно-Исследовательский Институт Строительной Физики Госстроя Ссср | Method of determining thermal conductivity of granules of loose material |
| RU2360235C1 (en) * | 2007-12-17 | 2009-06-27 | Государственное образовательное учреждение высшего профессионального образования "Сибирская государственная автомобильно-дорожная академия (СибАДИ)" | Method of determining coefficient of effective thermal conductivity of foamed concrete |
| CN101915776B (en) * | 2010-07-06 | 2012-05-23 | 舟山市博远科技开发有限公司 | Measuring method for thermal diffusivity of concrete and testing device |
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| CN101936932B (en) * | 2010-02-02 | 2012-07-18 | 国网电力科学研究院 | Measuring probe of soil thermal resistivity based on point heat source method |
| CN201955318U (en) * | 2011-01-11 | 2011-08-31 | 河海大学 | High-accuracy device for measuring the coefficients of temperature conductivity and heat conductivity of early concrete simultaneously |
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