CN207317990U - The cable force measurement device of low frequency micro breadth oscillation drag-line - Google Patents
The cable force measurement device of low frequency micro breadth oscillation drag-line Download PDFInfo
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- CN207317990U CN207317990U CN201721469063.7U CN201721469063U CN207317990U CN 207317990 U CN207317990 U CN 207317990U CN 201721469063 U CN201721469063 U CN 201721469063U CN 207317990 U CN207317990 U CN 207317990U
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Abstract
The cable force measurement device of low frequency micro breadth oscillation drag-line belongs to bridge cable force detection field.The device includes：Tested drag-line, drag-line capture unit, drag-line capture unit connector, vibrate delivery unit, auxiliary stand, main sliding unit, main sliding groove, main rotating bar, swinging mounting, rotating connector, from rotating bar, from sliding unit, from sliding groove, displacement head, displacement measurement unit, body base and data analysis unit；The present apparatus realize it is less to drag-line amplitude in the case of cable force measurement.The present apparatus has vibration enlarging function, the proportional amplification of the microvibration of drag-line can be measured and recorded to vibration easy to use displacement measurement unit.This patent can effectively detect the low-frequency vibration of drag-line, and solving the problems, such as vibrating sensor, measurement capability is very poor at low frequency, can directly detect fundamental vibration.The more currently used method of this patent cost is cheap.
Description
Technical field
The cable force measurement device of low frequency micro breadth oscillation drag-line belongs to bridge cable force detection field.
Background technology
Developed rapidly with economic construction of China with what is opened to the outside world, the continuous progress of bridge technology and people are to bridge
The requirement of aesthetic factors, drag-line technology are increasingly applied in Longspan Bridge.Wherein typical application has suspension bridge
Main push-towing rope, hoist cable, the oblique cable of cable-stayed bridge, the hoist cable for encircleing suspension bridge etc..As the core component of above-mentioned large bridge structure, spanning knot
The mobile load overwhelming majority is delivered on king-post by drag-line in the weight and bridge of structure.According to incompletely statistics, China's Long span drag-line class
Bridge has more than 300 seats, and most drag-lines are there are different degrees of disease, and in recent years, bridge collapses caused by bridge cable is broken
The major accident to collapse has also occurred.The small south gate Jinsha Yangtze Bridge Hangers failure in Yibin in 2011, bridge floor collapse；South in 2010
Rope is changed in level ground jade screen bridge fracture.It can be seen that due to being chronically in alternate stress, corrosion and the environment of wind-induced vibration, drag-line is easily made
Into local fatigue and damage, the shortening of its service life is not only resulted in, and directly affects internal force distribution and the structure line style of structure, danger
And total safety.A kind of flexible members of Suo Zuowei, have different mechanical characteristics from rigid member：There is no compressional stiffness,
Pulling force can only be born, there is obvious geometrical non-linearity, easily produces relaxation and stress loss.The stress of bridge cable and work
State is the one of the important signs that whether direct reflection bridge is in normal operation.In design and construction, it is necessary to draw bridge
Cable force is detected and optimizes, so that tower, beam are in optimal stress.In Cheng Qiaohou, it is also desirable to constantly monitor Suo Li
Change, understand the working status of drag-line, be adjusted in time, be allowed to meet design requirement.People's Republic of China's industry mark
Quasi- CJJ99-2003《Urban Bridge maintenance technology specification》5.9.5 middle requirement：" Cable power must carry out one-shot measurement every year,
Bridge adjusts the Suo Liying of rope compared with designing Suo Li for the last time after being completed ".People's Republic of China's recommended industry standard
JTG/T J21-2011《Highway bridge bearing capacity detecting appraisal code》In explicitly point out, Suo Li is cable-stayed bridge and suspension bridge
One of main load test project, is one of important parameter for reflecting bridge state.Therefore bridge cable force detection business is each inspection
It is a kind of indispensable detection project and basic capacity to survey mechanism.
1) jack pressure table determination method
Drag-line carries out tension using hydraulic jack at present.Since the tensioning oil cylinder and stretching force of jack have directly
Relation, the hydraulic pressure of tensioning oil cylinder is measured by precision pressure gauge or hydrostatic sensor, it is possible to try to achieve Suo Li.
2) determination of pressure sensor method
In cable tension, the stretching force of jack passes to dragline anchorage by connecting rod, and punching is socketed in connecting rod
Formula pressure sensor, the sensor be pressurized after can output voltage, then the drawing tension of jack can be read on secondary meter.
3) Suo Li dynamic testers method
Suo Li dynamic tester methods are to be grown between foundation Suo Li and the vibration frequency of rope there are the characteristics of correspondence in known rope
Degree, both ends restraint condition, distributed mass are placed in detection rope on rope when parameter, by highly sensitive frequency sensor and are vibrating
Vibration signal under excitation, can measure the natural frequency of vibration of drag-line after Digital Signal Processing, and then obtain Suo Li.Due to it
Convenience, measures with Suo Li dynamic testers in engineering mostly.
4) magnetic flux determination method
Magnetic flux determination method measure Cable power is that the magnetoelasticity principle based on ferrimagnet measures, when being subject to
When external force acts on, mechanical stress or strain are produced inside ferrimagnet, respective change occurs for its magnetic conductivity, by measuring magnetic conductance
The change of rate reflects the change of stress (or Suo Li).
Present technology has the following disadvantages：
1) it is not suitable for into the Suo Li dynamics measurement of bridge backstay and long-term measurement.Due to pressure gauge existing pointer in itself
Deflect the shake of too fast, pointer it is fierce, there are random error artificial during reading, oil not back to zero the problems such as, while into bridge backstay
Tensioning is completed, and is not easy to drag-line removing installation pressure gauge, is not particularly suited for into the measurement of the dynamic after bridge in this way
With long-term measurement.
2) it is expensive.Prices are rather stiff due to pressure sensor, is asked using useful life is short, dynamic response is poor etc.
Topic so that the determination method is only applicable to specific occasion.
3) measurement capability can not meet demand.Male wait of Wu Kang in 2006 point out in the literature, the vibration signal of drag-line be by
Multi resonant vibrate signal group into complex vibration signal, rope vibration frequency is generally (0.3~50) Hz, and radio-frequency component is then easily so that instrument
When sampling mixing phenomenon occurs for device, generally should give and filters out.Zhou Yi is according to GB/T 18365 within 2016《Cable-stayed bridge hot extruded polyethylene
High tensile steel wire drag-line technical conditions》The high tensile steel wire drag-line model parameter provided, have chosen the most thin and most thick of specification recommendation
Drag-line parameter, establish ANSYS finite element models, numerical simulation carried out to drag-line self-vibration characteristic, its drag-line density, section
Product, diameter, elasticity modulus, Poisson's ratio, Suo Li are constant, and rope length carries out simulation calculating from 10m to 200m by step-length of 1m, draws 1
The intrinsic natural frequency of vibration scope of rank is (14.39307~0.69740) Hz and (16.28878~0.71355) Hz respectively, and Suo Changyu
Frequency is inversely.Obviously, cable force measurement is carried out using Suo Li dynamic testers method, its vibrating sensor measurement range being equipped with needs
The low-frequency range of 0.3Hz~10Hz is covered, the price is very expensive for the sensor with the measurement capability, is not equipped with the sensing generally
Device.
4) measurement result accuracy is low.Magnetic flux method is not in place since technology develops, and causes accuracy of measurement relatively low, can not
Meet Practical Project demand.
The content of the invention
The technical problem that the application is solved：
Measurement capability can cover the relatively low long rope of vibration frequency；
It can apply in bridge construction beam and the detection and monitoring into bridge；
Improve measurement accuracy.
The cable force measurement device of low frequency micro breadth oscillation drag-line is mainly passed by data analysis unit, displacement measurement unit, vibration
The part such as unit is sent to form, hardware connection figure is as shown in Figure 1.
Drag-line capture unit can tightly pin drag-line, make not being moved on drag-line during its work.Drag-line catches single
Drag-line capture unit connector is installed in member.Vibration delivery unit can be installed on drag-line capture unit connector, by shaking for drag-line
It is dynamic to be delivered on this patent corresponding device.Vibration delivery unit is fixed by auxiliary stand so that vibration delivery unit and auxiliary
Stent keeps horizontal, and vibration delivery unit can produce horizontal displacement with auxiliary stand.Vibration delivery unit lower end is connected with
Main sliding groove.Main sliding unit can move horizontally in main sliding groove along long side direction.Main rotating bar is connected to main slip
On unit, and with from rotating bar shape in an angle.Main rotating bar and junction from rotating bar are rotating connector, the company of rotation
Fitting makes winner's rotating bar and does not change from the relative position between rotating bar, and main rotating bar and from rotating bar formed
Structure can be rotated by the center of circle of rotating connector.It is connected with from the other end of rotating bar from sliding unit.From cunning
Moving cell is installed on from sliding groove, and the slave sliding unit for being can moved horizontally from sliding groove by long side direction.From cunning
One end of dynamic groove is connected on displacement head.Displacement head moves up dynamic in displacement measurement unit.Displacement measurement unit measures displacement head
Displacement, and displacement information is transferred in data analysis unit.Data analysis unit has display displacement curve, display frequency spectrum
The function that figure, display frequency, display rope force value and data calculate.Body base is used for fixed displacement measuring unit, rotates branch
Frame and auxiliary stand.
Main sliding groove can select air-float guide rail or Magnetically suspended guide rail, realize main sliding unit on main sliding groove without friction
With vibrationless smooth movement.Air-float guide rail or Magnetically suspended guide rail can be selected from sliding groove, is realized from sliding unit from slip
Smoothly being moved with vibrationless without friction on groove.
Displacement measurement unit can select high-precision grating scale, capacitance-grid type digital displacement sensor, laser range sensor,
Draw wire encoder etc..
Data analysis unit can select computer, industrial personal computer, microcontroller, mobile phone etc..
Drag-line capture unit, drag-line capture unit connector, vibration delivery unit and auxiliary stand, are used for described in this patent
Equivalence transmits the vibration of drag-line.
Main sliding unit described in this patent, main sliding groove, main rotating bar, swinging mounting, rotating connector, from rotating bar,
From sliding unit, from sliding groove and displacement head, for the vibration by certain ratio transmission drag-line.Wherein, the size of ratio with
Main rotating bar and length from rotating bar are positively correlated relation；If the main long L of rotating bar, rotational angle θ, then main rotating bar moves
Vertical range isAlso can so it be derived from rotating bar.
The displacement information of data analysis unit record displacement measurement unit transmission described in this patent, and time-history curves are drawn,
More order frequencies of tested inhaul cable vibration are calculated using Wavelet transformation, the calculating to more order frequencies is passed through based on Chord vibration theory
Obtain the rope force value of tested drag-line.
Drag-line capture unit can be a pair of of semi-cylindrical ring, and the internal diameter of semi-cylindrical ring is identical with the outside diameter of tested drag-line.Shake
Dynamic delivery unit can be rigid optical axis.Auxiliary stand is that perpendicular to the ground, the direction of displacement head movement is also perpendicular to the ground.
Initialization refers to that displacement measurement unit indicating value is zeroed, and the record of data analysis unit empties zero, main rotating bar with
Reach balance from rotating bar.Balance refers to main rotating bar and will not be rotated from rotating bar in the case where drag-line does not vibrate.
In order to reach balance, can use the whole main rotating bar of hand adjustment, from rotating bar, main sliding groove, from the position of sliding groove.Angle, θ is main
Rotating bar is using rotating connector as the center of circle, the angle that rotates clockwise.5th, displacement head is on displacement measurement unit
It is mobile.
The device for being used to measure Cable power described in this patent is transmitted by data analysis unit, displacement measurement unit, vibration
The part such as unit forms.
Overall technological scheme realizes that process is as follows：
(1) drag-line capture unit is installed on tested drag-line so that drag-line capture unit and tested drag-line fit closely.
(2) body base is placed on stable ground, and enables vibration delivery unit long side perpendicular to ground
Face.
(3) device power-up initializing, main rotating bar and reaches equilibrium state from rotating bar.
(4) tested drag-line is encouraged using modes such as hammerings so that drag-line produces vibration.
(5) delivery unit is vibrated as inhaul cable vibration produces upper and lower displacement, and direction of displacement should be parallel to auxiliary stand.
(6) push-pull effort that the movement of main sliding groove delivery unit vibrated produces, is subjected to displacement so that main sliding unit by
Compel to produce bilateral reciprocation in main sliding groove, the direction of motion should be parallel to main sliding groove.
(7) the main rotating bar of mobile drive of main sliding unit does reciprocating rotation around connector.
(8) reciprocating rotation occurs from rotating bar because of the rotation of main rotating bar, the rotation side of rotation direction and main rotating bar
To being consistent.
(9) from rotating bar reciprocating rotation when drive from sliding unit produce displacement.
(10) doing bilateral reciprocation out of sliding groove from sliding unit, the direction of motion with it is horizontal from sliding groove.
(11) it is subject to the power applied from sliding unit from sliding groove, so that it is reciprocal to drive displacement head to be carried out along vertical direction
Movement；
(12) situation of movement of displacement measurement unit measurement displacement head.
(13) displacement information measured is transferred in data analysis unit by displacement measurement unit.
(14) time-history curves for the displacement data real-time display displacement that data analysis unit is transmitted according to displacement measurement unit.
(15) data analysis unit is calculated using FFT scheduling algorithms and draws out spectrogram.
(16) data analysis unit is based on Chord vibration theory, and the frequency of displacement curve is calculated using wavelet transformation scheduling algorithm
With rope force value.
Brief description of the drawings
Fig. 1 schematic devices
In figure, 1 is tested drag-line, and 2 be drag-line capture unit, and 3 be drag-line capture unit connector, and 4 be vibration delivery unit,
5 be auxiliary stand, and 6 be main sliding unit, and 7 be main sliding groove, and 8 be main rotating bar, and 9 be swinging mounting, and 10 be rotating connector,
11 be from rotating bar, and 12 be from sliding unit, and 13 is are displacement head from sliding groove, 14, and 15 be displacement measurement unit, and 16 be main body
Base, 17 be data analysis unit.
The technical solution flow chart of the apparatus and method of Fig. 2 measurement Cable power
The flow chart of example 1 shown in Fig. 3.
Embodiment
1 flow chart of example with reference to shown in figure 3,1 technical solution of example realize that process is as follows：
(1) drag-line capture unit is installed on tested drag-line so that drag-line capture unit and tested drag-line fit closely.
(2) body base is placed on stable ground, and enables vibration delivery unit long side perpendicular to ground
Face.
(3) device power-up initializing, main rotating bar and reaches equilibrium state from rotating bar.
(4) tested drag-line is encouraged using modes such as hammerings so that drag-line produces vibration.
(5) Vibration Condition of drag-line is delivered on displacement head by the certain amplitude amplification of device, the displacement measurement of device
Unit measures the misalignment of displacement head, and is transferred to the data analysis unit of device.
(6) time-history curves for the displacement data real-time display displacement that data analysis unit is transmitted according to displacement measurement unit,
And it is theoretical based on Chord vibration, the rope force value of displacement curve is calculated using wavelet transformation scheduling algorithm.
This patent realize it is less to drag-line amplitude in the case of cable force measurement.Device has vibration enlarging function, energy
Enough proportional amplifications of microvibration by drag-line, easy to which vibration is measured and recorded using displacement measurement unit.This patent
The low-frequency vibration of drag-line can be effectively detected, solving the problems, such as vibrating sensor, measurement capability is very poor at low frequency, Neng Gouzhi
Connect and detect fundamental vibration.The more currently used method of this patent cost is cheap.
The invention cable force measurement device of low frequency micro breadth oscillation drag-line.
The method of existing Suo Li dynamic testers method measurement Cable power, since vibrating sensor is in the low of 0.3Hz~10Hz
Measurement capability is very poor in the range of frequency, is all after obtaining high frequent vibration frequency using vibration pickup measurement, by calculating different order frequencies
Frequency difference between rate is as guy cable vibrating base frequency, so that Cable force value be calculated.Can be with according to many experiments and document record
To know, the maximum error of measuring of traditional Suo Li dynamic testers measurement Suo Li can reach 2.1%, and the measurement error of existing method is larger,
It can not meet actual demand.The maximum error of measuring of this patent is about 1.5%.
Claims (5)
1. the cable force measurement device of low frequency micro breadth oscillation drag-line, it is characterised in that including：Tested drag-line, drag-line capture unit, draws
Rope capture unit connector, vibrates delivery unit, auxiliary stand, main sliding unit, main sliding groove, main rotating bar, swinging mounting, turns
Follower link, from rotating bar, from sliding unit, from sliding groove, displacement head, displacement measurement unit, body base and data analysis
Unit；
Drag-line capture unit can tightly pin drag-line, make not being moved on drag-line during its work；On drag-line capture unit
Drag-line capture unit connector is installed；Vibration delivery unit can be installed on drag-line capture unit connector；Vibration delivery unit leads to
Cross auxiliary stand to fix so that vibration delivery unit keeps horizontal with auxiliary stand, and vibration delivery unit can be with auxiliary branch
Frame produces horizontal displacement；Vibration delivery unit lower end is connected with main sliding groove；Main sliding unit can in main sliding groove along
Long side direction moves horizontally；Main rotating bar is connected on main sliding unit, and with from rotating bar shape in an angle；Main rotating bar
It is rotating connector with the junction from rotating bar, rotating connector makes winner's rotating bar and from the relative position between rotating bar
Do not change, and main rotating bar and the structure from rotating bar formation can be rotated by the center of circle of rotating connector；
It is connected with from the other end of rotating bar from sliding unit；It is installed on from sliding unit from sliding groove, can be from sliding unit
Moved horizontally from sliding groove by long side direction；It is connected to from one end of sliding groove on displacement head；Displacement head is in displacement measurement list
Moved in member；Displacement measurement unit measures the displacement of displacement head, and displacement information is transferred in data analysis unit；Main body bottom
Seat is used for fixed displacement measuring unit, swinging mounting and auxiliary stand.
2. device according to claim 1, it is characterised in that main sliding groove selects air-float guide rail or magnetic to float from sliding groove
Guide rail.
3. device according to claim 1, it is characterised in that displacement measurement unit can select high-precision grating scale, appearance
Grid type digital displacement sensor, laser range sensor or draw wire encoder.
4. device according to claim 1, it is characterised in that data analysis unit can select computer, industrial personal computer, list
Piece machine or mobile phone.
5. device according to claim 1, it is characterised in that the main sliding unit, main sliding groove, main rotating bar, turn
Dynamic stent, rotating connector, from rotating bar, from sliding unit, from sliding groove and displacement head, drawn for being transmitted by certain ratio
The vibration of rope；Wherein, the size of ratio is positively correlated relation with main rotating bar and the length from rotating bar；If the main long L of rotating bar,
Rotational angle θ, the then vertical range that main rotating bar moves are
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469063.7U CN207317990U (en) | 2017-11-07 | 2017-11-07 | The cable force measurement device of low frequency micro breadth oscillation drag-line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721469063.7U CN207317990U (en) | 2017-11-07 | 2017-11-07 | The cable force measurement device of low frequency micro breadth oscillation drag-line |
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| CN207317990U true CN207317990U (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721469063.7U Withdrawn - After Issue CN207317990U (en) | 2017-11-07 | 2017-11-07 | The cable force measurement device of low frequency micro breadth oscillation drag-line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941402A (en) * | 2017-11-07 | 2018-04-20 | 交通运输部公路科学研究所 | A kind of device and method for being used to measure Cable power |
| CN111928890A (en) * | 2020-07-14 | 2020-11-13 | 宁波大学 | Method for measuring self-vibration frequency and cable force of inhaul cable in real time |
-
2017
- 2017-11-07 CN CN201721469063.7U patent/CN207317990U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941402A (en) * | 2017-11-07 | 2018-04-20 | 交通运输部公路科学研究所 | A kind of device and method for being used to measure Cable power |
| CN107941402B (en) * | 2017-11-07 | 2023-09-08 | 交通运输部公路科学研究所 | Device and method for measuring inhaul cable force |
| CN111928890A (en) * | 2020-07-14 | 2020-11-13 | 宁波大学 | Method for measuring self-vibration frequency and cable force of inhaul cable in real time |
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