CN104880273B - Prestress wire prestressing force measurement apparatus and method - Google Patents
Prestress wire prestressing force measurement apparatus and method Download PDFInfo
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- CN104880273B CN104880273B CN201510315049.0A CN201510315049A CN104880273B CN 104880273 B CN104880273 B CN 104880273B CN 201510315049 A CN201510315049 A CN 201510315049A CN 104880273 B CN104880273 B CN 104880273B
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Abstract
The invention discloses a kind of prestress wire prestressing force measurement apparatus, including switch element, charging module and data processing module, the switch element is charged by steel strand wires to charging module, the input signal of the data processing module collection steel strand wires and the output signal of steel strand wires, the output signal of the input signal of steel strand wires and steel strand wires is converted into the charge-time signal of charging module by the data processing module, the variable quantity of steel strand wires inductance is obtained by the variable quantity in charging interval, and then obtains the prestress change amount of steel strand wires.The present invention can realize nondestructive measurement, it is possible to achieve a kind of conveniently prestress detection, unconditional limitation, can be adapted to the prestress detection of various occasions.
Description
Technical field
The present invention relates to structure monitoring field, and in particular to a kind of prestress wire prestressing force measurement apparatus and use should
The method that device carries out prestressing force measurement.
Background technology
At present the prestressing force measuring method of prestress wire mainly by magnetic flux method, sound sensing method, micro-indentations technology with
And optical fiber sensing technology etc..Sound senses the spread speed for utilizing ultrasonic signal to launch in the material, occur in diffraction process, width
Degree, frequency etc. change, but measurement accuracy is not high；Micro-indentations are detected by being pressed into tested material in fine rigid material array,
Enter the press-in resistivity and response situation of material so as to measure material to micro-nano, determine Mechanical Properties of Materials, but in advance should
The method of identified sign state is without determination result under power steel strand wires stress, and can steel strand wires be produced with certain damage；
The method that optical fiber sensing technology in advance nuzzles Bragg grating sensor inside pre-stress concrete in advance realizes detection, but with when
Between elapse, sensor ageing aggravation, have a strong impact on measurement accuracy；Magnetic flux method analyzes stress using the galvanomagnetic-effect of steel
The universal law of distribution and damage etc. and electromagnetic property change, but prestress wire stress in prestressed concrete, and can not
Load magnetic coil and can not use；To sum up, measured for the prestressing force of prestress wire, there is presently no suitable accurate
Method.
The content of the invention
In view of this, it is an object of the invention to provide a kind of prestress wire prestressing force measurement apparatus and using the dress
Put the method for carrying out prestressing force measurement.
An object of the present invention realizes that the measurement of prestress wire prestressing force fills by such technical scheme
Put, including switch element, charging module and data processing module, the switch element are charged by steel strand wires to charging module,
The input signal of the data processing module collection steel strand wires and the output signal of steel strand wires, the data processing module twist steel
The input signal of line and the output signal of steel strand wires are converted into the charge-time signal of charging module, pass through the change in charging interval
The variable quantity of steel strand wires inductance is measured, and then obtains the prestress change amount of steel strand wires.
The second object of the present invention realizes that a kind of prestress wire prestressing force measures by such technical scheme
Method, including：
A. switching signal is applied to the input of steel strand wires by switch element and charged to charging module；
B. steel strand wires input and the signal of output end are gathered；
C., the input signal of steel strand wires and output signal are converted into the charge-time signal of charging module；
D. the variable quantity of steel strand wires inductance is obtained by the variable quantity in charging interval, and then the prestressing force for obtaining steel strand wires becomes
Change amount.
By adopting the above-described technical solution, the present invention has the advantage that：
A. nondestructive measurement is realized, uses this method, it is possible to achieve a kind of conveniently prestress detection, unconditional limit
System, the prestress detection of various occasions can be adapted to；
B. integration of equipments degree is high, and measurement accuracy is high, and stability is good, disclosure satisfy that the demand of long term monitoring；
C. it is not affected by the external environment, the real bearing state of structure can be reflected.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
The detailed description of one step, wherein：
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the concrete structure circuit diagram of the present invention.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment
Only for the explanation present invention, the protection domain being not intended to be limiting of the invention.
The present invention provides a kind of prestress wire prestressing force measurement apparatus, including switch element, charging module and data
Processing module, the switch element are charged by steel strand wires to charging module, and the data processing module gathers the defeated of steel strand wires
Enter the output signal of signal and steel strand wires, the data processing module is by the input signal of steel strand wires and the output signal of steel strand wires
The charge-time signal of charging module is converted into, the variable quantity of steel strand wires inductance is obtained by the variable quantity in charging interval, and then
Obtain the prestress change amount of steel strand wires.
Preferably, the switch element includes metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor connects control signal, and the source electrode of metal-oxide-semiconductor connects
The input of steel strand wires, the drain electrode of metal-oxide-semiconductor meet VCC。
Preferably, the charging module is electric capacity, and one end of electric capacity is grounded, the output end of another termination steel strand wires.
Preferably, the data processing module includes the first NOT gate, the second NOT gate, the first NAND gate, the second NAND gate, meter
Number devices and MCU, the input of first NOT gate and the output end of steel strand wires connect, the output end of the first NOT gate with first with it is non-
The first input end connection of door, the second input of first NAND gate and the input of steel strand wires connect, the first NAND gate
Output end be connected with the input of the second NOT gate, the output end of the second NOT gate is connected with the first input end of the second NAND gate,
Second input termination crystal oscillation signal of the second NAND gate, the output end of second NAND gate are connected with counter, the counting
The output end of device is connected with MCU.
In the present invention, the first input end for defining the first NAND gate is b ends, and the second input is a ends, the second NAND gate
First input end be c ends, output end is d ends.
Electric capacity progress charge control connect by single-chip microcomputer control mos pipes Q1 to steel strand wires, according to circuit can obtain as
Lower logical process：
1. original state：A logic level=0；B logic level=1；C logic level=0；
2. charging process：A logic level=1；B logic level=1；C logic level=1；
3. charging reaches gate unblocked level：A logic level=1；B logic level=0；C logic level=0；
Therefore a gate-control signal is formd at c ends so that signal caused by 10MHz crystal oscillators leads within the gate-control signal time
Cross, then the number of signals passed through in this section of gate duration is counted by single-chip microcomputer, so as to calculate gate duration.
Because the voltage U being carried on steel strand wires is certain, then haveAccording to electromagnetic induction principle, upper electric
In a flash, electric current can be gradually increasing from 0, therefore inductance can hinder its rising, and causing capacitor charging time to be extended, (electric capacity is full of
Time it is constant, the time simply started to charge up is delayed by, therefore the overall charging interval is delayed by).When steel strand wires are because of prestressing force
After changing, respective change can occur for its inductance value, and then influence the discharge and recharge time of electric capacity, therefore, as long as calculating electricity
Hold the variable quantity of discharge and recharge time, it is possible to extrapolate the inductance variable quantity of steel strand wires, and then calculate prestressed variable quantity.
Have for the inductance of steel strand wires：
L：Inductance, unit H
l：Conductor length, unit m
R：Steel strand wires radius, unit m
u0：Space permeability, u0=4 π 10-7H/m
And after steel strand wires stress variation causes steel strand wires to deform, inductance value can change, therefore only need to measure this
The variable quantity of steel strand wires inductance value, you can obtain the prestressing force size of steel strand wires.
∵
The inductance variations that ∴ obtains according to measurement, can extrapolate the l of steel strand tension length, and shape does not occur for steel strand wires
The length of change subtracts the variable quantity of length when deforming upon as Δ l；
The length and stress of steel strand tension have following corresponding relation：
Δl：Steel strand wires length change amount；
Pp：The prestressing force of steel strand wires；
lSteel：Steel strand wires length；
Ap：Steel strand wires cross-sectional area；
Ep：Steel strand wires modulus of elasticity；
It can obtainAccording to the relation for calculating steel strand wires inductance value and length before, according to measurement
Inductance obtains the length change amount of steel strand wires, then can calculate the prestressing force size of steel strand wires.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, it is clear that those skilled in the art
Member can carry out various changes and modification without departing from the spirit and scope of the present invention to the present invention.So, if the present invention
These modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to include these
Including change and modification.
Claims (6)
1. prestress wire prestressing force measurement apparatus, it is characterised in that：Including switch element, charging module and data processing mould
Block, the switch element are charged by steel strand wires to charging module, the input signal of the data processing module collection steel strand wires
With the output signal of steel strand wires, the output signal of the input signal of steel strand wires and steel strand wires is converted into by the data processing module
The charge-time signal of charging module, the variable quantity of steel strand wires inductance is obtained by the variable quantity in charging interval, and then obtain steel
The prestress change amount of twisted wire；The data processing module include the first NOT gate, the second NOT gate, the first NAND gate, second with it is non-
Door, counter and MCU, the input of first NOT gate and the output end of steel strand wires connect, the output end of the first NOT gate and the
The first input end connection of one NAND gate, the second input of first NAND gate and the input of steel strand wires connect, and first
The output end of NAND gate is connected with the input of the second NOT gate, the first input end of the output end of the second NOT gate and the second NAND gate
Connection, the second input termination crystal oscillation signal of the second NAND gate, the output end of second NAND gate is connected with counter, described
The output end of counter is connected with MCU；
The computational methods of prestressed variable quantity are：
Have for the inductance of steel strand wires：
<mrow>
<mi>L</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
<mi>l</mi>
</mrow>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<mi>ln</mi>
<mfrac>
<mrow>
<mn>2</mn>
<mi>l</mi>
</mrow>
<mi>r</mi>
</mfrac>
<mo>-</mo>
<mn>0.75</mn>
<mo>)</mo>
</mrow>
</mrow>
L:Inductance, unit H；l:Conductor length, unit m；r：Steel strand wires radius, unit m；u0:Space permeability；
And after steel strand wires stress variation causes steel strand wires to deform, inductance value can change, therefore only need to measure steel strand
The variable quantity of line inductance value, that is, obtain the prestressing force size of steel strand wires；
<mrow>
<mi>L</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
<mi>l</mi>
</mrow>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>l</mi>
<mi>n</mi>
</msub>
<mfrac>
<mrow>
<mn>2</mn>
<mi>l</mi>
</mrow>
<mi>r</mi>
</mfrac>
<mo>-</mo>
<mn>0.75</mn>
<mo>)</mo>
</mrow>
</mrow>
The inductance variations obtained according to measurement, extrapolate steel strand tension length l, the length that steel strand wires do not deform upon subtracts
The variable quantity of length is Δ l when deforming upon；
The length and stress of steel strand tension have following corresponding relation：
Δl:Steel strand wires length change amount；Pp:The prestressing force of steel strand wires；lSteel:Steel strand wires length；Ap:Steel strand wires cross-sectional area；Ep:
Steel strand wires modulus of elasticity；ObtainAccording to the relation for calculating steel strand wires inductance value and length before, according to survey
The inductance of amount obtains the length change amount of steel strand wires, then calculates the prestressing force size of steel strand wires.
2. prestress wire prestressing force measurement apparatus according to claim 1, it is characterised in that：The switch element bag
Metal-oxide-semiconductor is included, the grid of the metal-oxide-semiconductor connects control signal, and the source electrode of metal-oxide-semiconductor connects the input of steel strand wires, and the drain electrode of metal-oxide-semiconductor connects
VCC。
3. prestress wire prestressing force measurement apparatus according to claim 2, it is characterised in that：The charging module is
Electric capacity, one end ground connection of electric capacity, the output end of another termination steel strand wires.
A kind of 4. prestress wire prestressing force measuring method, it is characterised in that：Including
A. switching signal is applied to the input of steel strand wires by switch element and charged to charging module；
B. data processing module collection steel strand wires input and the signal of output end；
C., the input signal of steel strand wires and output signal are converted into the charge-time signal of charging module；
D. the variable quantity of steel strand wires inductance is obtained by the variable quantity in charging interval, and then obtains the prestress change of steel strand wires
Amount；
The computational methods of prestressed variable quantity are：
Have for the inductance of steel strand wires：
<mrow>
<mi>L</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
<mi>l</mi>
</mrow>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<mi>ln</mi>
<mfrac>
<mrow>
<mn>2</mn>
<mi>l</mi>
</mrow>
<mi>r</mi>
</mfrac>
<mo>-</mo>
<mn>0.75</mn>
<mo>)</mo>
</mrow>
</mrow>
L:Inductance, unit H；l:Conductor length, unit m；r：Steel strand wires radius, unit m；u0:Space permeability；
And after steel strand wires stress variation causes steel strand wires to deform, inductance value can change, therefore only need to measure steel strand
The variable quantity of line inductance value, that is, obtain the prestressing force size of steel strand wires；
<mrow>
<mi>L</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
<mi>l</mi>
</mrow>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>l</mi>
<mi>n</mi>
</msub>
<mfrac>
<mrow>
<mn>2</mn>
<mi>l</mi>
</mrow>
<mi>r</mi>
</mfrac>
<mo>-</mo>
<mn>0.75</mn>
<mo>)</mo>
</mrow>
</mrow>
The inductance variations obtained according to measurement, extrapolate steel strand tension length l, the length that steel strand wires do not deform upon subtracts
The variable quantity of length is Δ l when deforming upon；
The length and stress of steel strand tension have following corresponding relation：
Δl:Steel strand wires length change amount；Pp:The prestressing force of steel strand wires；lSteel:Steel strand wires length；Ap:Steel strand wires cross-sectional area；Ep:
Steel strand wires modulus of elasticity；ObtainAccording to the relation for calculating steel strand wires inductance value and length before, according to survey
The inductance of amount obtains the length change amount of steel strand wires, then calculates the prestressing force size of steel strand wires；
Data processing module includes the first NOT gate, the second NOT gate, the first NAND gate, the second NAND gate, counter and MCU, described
The input of first NOT gate and the output end of steel strand wires connect, the first input end of the output end of the first NOT gate and the first NAND gate
Connection, the second input of first NAND gate and the input of steel strand wires connect, the output end of the first NAND gate and second
The input connection of NOT gate, the output end of the second NOT gate is connected with the first input end of the second NAND gate, and the of the second NAND gate
Two input termination crystal oscillation signals, the output end of second NAND gate are connected with counter, the output end and MCU of the counter
Connection.
5. prestress wire prestressing force measuring method according to claim 4, it is characterised in that：The switch element bag
Metal-oxide-semiconductor is included, the grid of the metal-oxide-semiconductor connects control signal, and the source electrode of metal-oxide-semiconductor connects the input of steel strand wires, and the drain electrode of metal-oxide-semiconductor connects
VCC。
6. prestress wire prestressing force measuring method according to claim 5, it is characterised in that：The charging module is
Electric capacity, one end ground connection of electric capacity, the output end of another termination steel strand wires.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158300A (en) * | 2015-09-17 | 2015-12-16 | 中铁大桥科学研究院有限公司 | Detection method for bridge linear steel member |
| CN106225976B (en) * | 2016-07-07 | 2019-04-02 | 重庆交通大学 | A method of steel strand prestress is measured using electromagnetic viscosimeter principle |
| CN107102038B (en) * | 2017-06-12 | 2023-04-11 | 重庆交通大学 | Cable corrosion damage detection system and method based on equivalent series capacitance measurement |
| CN108489641B (en) * | 2018-03-20 | 2020-06-02 | 重庆交通大学 | Stress measuring device and method for prestressed steel strand |
| CN109900395B (en) * | 2019-04-10 | 2024-10-29 | 四川省交通勘察设计研究院有限公司 | Device capable of monitoring prestress loss in real time |
| CN113847945A (en) * | 2021-09-18 | 2021-12-28 | 上海电力设计院有限公司 | Health monitoring system and method for wind power tower barrel |
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