CN110319763A - The measuring device and measurement method of the fracture pattern of Reinforced Concrete Bridge - Google Patents
The measuring device and measurement method of the fracture pattern of Reinforced Concrete Bridge Download PDFInfo
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- CN110319763A CN110319763A CN201910524350.0A CN201910524350A CN110319763A CN 110319763 A CN110319763 A CN 110319763A CN 201910524350 A CN201910524350 A CN 201910524350A CN 110319763 A CN110319763 A CN 110319763A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/004—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a kind of measuring device of the fracture pattern of concrete-bridge and measurement method, device includes along track and trolley；Trolley is equipped with turntable, and turntable roof center is equipped with the first Magnetic Sensor；It is through with guide groove in turntable, rack gear is sliding combined in guide groove, a side wall of guide groove is equipped with notch, is equipped in notch through second motor-operated gear, wheel and rack intermeshing；Rack gear front end is equipped with the second Magnetic Sensor and third motor, and swing rod is fixed on the output shaft of third motor, and the output shaft of third motor is equipped with the second angle-position encoder, and swing rod free end is equipped with third Magnetic Sensor；Its method it is critical that establish polar coordinates, the developed width of each measurement point and the width centreline in crack are obtained, to obtain the contour line in crack.The device and method energy accurate Characterization fracture strike and profile.
Description
Technical field
The present invention relates to the detections of concrete bridge construction and recovery technique field, are especially a kind of reinforced concrete
The measuring device and measurement method of the fracture pattern of native bridge structure.
Background technique
Concrete bridge construction bears Vehicle Load for a long time, and with socio-economic development, overclocking and overload are existing
As more prominent, the fatigue damage of girder construction is constantly accumulated, and with the degeneration of material and structural behaviour, at the bottom of bridge structure
Easily there is distress in concrete in face or side.And once there is distress in concrete, etching channels will be opened, corrosive medium is caused
Intrusion is even broken so that corrosion fatigue occurs for reinforcing bar, and distress in concrete is continuous under the coupling of environment and load
Extension eventually leads to structure and fatigue failure occurs；And due to the emergentness of fatigue failure and it is difficult to predict property, reinforced concrete bridges
The crack of girder construction is very big to the security threat of structure itself.Therefore, real time monitoring perceives the cracking of distress in concrete, repairs in time
Benefit crack, progress structural strengthening are significant for the safety and service life that ensure reinforced beam.And key therein just exists
In the specific cracking situation for how precisely effectively knowing reinforced beam.
Currently, the detection to distress in concrete mainly still relies on manually, but artificial detection there will naturally be larger defect, such as
Detection intensity is big, high labor cost, and more important is the sense of responsibility of tester, experience, level, state etc. is unstable when participating in the cintest
Factor, it is clear that will affect the accuracy of testing result, detection accuracy is low, stability is poor, and error probability is high.Certainly, go out in recent years
The shortcomings that mode of existing unmanned machine testing compensates for artificial detection to a certain extent, i.e., taken pictures using unmanned plane, then in electricity
Post-processing, conversion are carried out to photo in brain, to obtain the parameters in crack.But the precision of current unmanned plane detection technique is not
It is high, it is difficult to identify micro-cracks, and also bigger according to the error that photo is handled, the accuracy that objectively detects, measurement
Precision is insufficient, is difficult precisely to measure the information such as width, the trend of the specific section in crack, can not formulate for the later period and targetedly repair
Benefit measure provides enough supports.
Summary of the invention
The invention solves a technical problem be to provide it is a kind of for measurement the reinforced concrete bridge of Equipment Foundations is provided
The measuring device of the fracture pattern of beam.
A kind of technical solution of the invention is to provide a kind of measurement dress of the fracture pattern of Reinforced Concrete Bridge
It sets, it includes the track being laid with along reinforced beam length direction and the trolley being slidably matched in orbit；Trolley is equipped with
Through first motor-operated turntable, the output shaft of the first motor is equipped with the first angle-position encoder, in turntable top plate
The heart is equipped with the first Magnetic Sensor；It is through with guide groove in turntable, rack gear, a side of guide groove are sliding combined in guide groove
Wall is equipped with notch, is equipped in notch through second motor-operated gear, wheel and rack intermeshing；Rack gear front end is equipped with
Second Magnetic Sensor and third motor, are fixed with swing rod on the output shaft of third motor, on the output shaft of third motor
Equipped with the second angle-position encoder, swing rod free end is equipped with third Magnetic Sensor.
The invention solves another technical problem be to provide a kind of width centreline that can obtain crack and different survey
Measure measurement method of the developed width of point in the form of characterizing the distress in concrete of fracture strike and profile.
Another technical solution of the invention is to provide a kind of measurement method of distress in concrete form, step
Include:
A, trolley advances along track, when the first Magnetic Sensor detects magnetic signal fluctuation, indicates that direction of advance exists and splits
Seam, parking when the magnetic signal fluctuation of the first Magnetic Sensor is to reach to peak value, and using parking position as polar pole, and from pole
Point draws a ray vertical with trolley direction of advance as polar axis；
B, start the second motor, so that rack gear stretches out guide groove open front, then the first motor driven to rotate rack gear,
When the second Magnetic Sensor identifies magnetic signal fluctuation for the first time, indicate that crack, the magnetic of the second Magnetic Sensor are crossed in rack gear front end for the first time
Stop rack gear when signal fluctuation is to reach to peak value, at this point, the tooth using the sum of the preceding elongation of rack gear and turntable radius as polar diameter
Angle when item stops between polar axis obtains the polar coordinates of first measurement point as polar angle；
C, start third motor, swing rod is made to rotate a circle around first measurement point, swing rod free end can be twice across splitting
Seam makes the magnetic signal of third Magnetic Sensor that two secondary undulations occur, and the second angle-position encoder can measure the every subwave of third Magnetic Sensor
Swing rod corresponding pendulum angle variable ⊿ θ when dynamic, brings every secondary undulation corresponding pendulum angle variable ⊿ θ and swing rod radius r into Width Formula of Rib Knitted Fabric L
=2 θ/360 π r ⊿, so that it may obtain the width that swing rod crosses over crack every time；In this way, just obtaining first crack measurement point two sides
Two fracture widths, the average value of two fracture widths is exactly developed width of the crack in the measurement point；
D, it keeps the preceding elongation of rack gear constant, continues rotated rack, when the second Magnetic Sensor again identifies that magnetic signal
It when fluctuation, indicates that crack is crossed in rack gear front end again, stops rack gear when the magnetic signal fluctuation of the second Magnetic Sensor is to reach to peak value, this
When, polar diameter is remained unchanged with the polar diameter in step b, using the angle this moment between rack gear and polar axis as polar angle, is obtained second and is split
Stitch the polar coordinates of measurement point；
E, driving swing rod rotates a circle around second measurement point, and swing rod free end can cross over crack twice, and the second corner is compiled
It is brought into width public affairs by swing rod corresponding two pendulum angle variable ⊿ θ when code device can measure third two secondary undulation of Magnetic Sensor respectively
Formula to obtain two fracture widths of second crack measurement point two sides, and then obtains the developed width of second measurement point；
F, drive rack continues to stretch out a fixed intervals value to form new preceding elongation, then rotated rack, the second magnetic
Sensor identifies magnetic signal fluctuation, and stops rack gear when magnetic signal fluctuation is to reach to peak value, with the new preceding elongation of rack gear and rotation
Angle of the sum of the turntable radius as polar diameter and when rack gear stopping between polar axis obtains next crack measurement point as polar angle
Polar coordinates；
G, driving swing rod rotates a circle around next measurement point, and swing rod free end can cross over crack twice, and the second corner is compiled
It is brought into width public affairs by swing rod corresponding two pendulum angle variable ⊿ θ when code device can measure third two secondary undulation of Magnetic Sensor respectively
Formula to obtain two fracture widths of next crack measurement point two sides, and then obtains the developed width of next measurement point；
H, it keeping the preceding elongation of rack gear constant, continues rotated rack, the second Magnetic Sensor again identifies that magnetic signal fluctuates,
And stop rack gear when magnetic signal fluctuation is to reach to peak value, keep the polar diameter in step f constant, with the folder this moment between rack gear and polar axis
Angle is as polar angle, the polar coordinates of next crack measurement point under acquisition；
I, driving swing rod next measurement point under rotates a circle, and swing rod free end can cross over crack twice, and the second corner is compiled
It is brought into width public affairs by swing rod corresponding two pendulum angle variable ⊿ θ when code device can measure third two secondary undulation of Magnetic Sensor respectively
Formula, with obtain under next crack measurement point two sides two fracture widths, and then obtain under next measurement point developed width；
J, repeat step f~i, and be often repeated once can obtain two new crack measurement points and it is corresponding two it is practical wide
Degree；When extension simultaneously rotated rack again, the identification of the second Magnetic Sensor is fluctuated less than magnetic signal；
K, pole and whole cracks measurement point are connected with line in polar coordinate system, characterization fracture strike is obtained with this
Width centreline, and the developed width line segment of each measurement point is drawn, by the endpoint line that whole developed width line segments are ipsilateral
It connects to obtain the contour line in crack.
The verifying attachment and the method for inspection of distress in concrete repairing effect of the present invention compared with prior art, have following excellent
Point.
The principle of above-mentioned technical proposal is that magnetic material its magnetism in bearing load can occur accordingly to change, i.e. pressure magnetic
Effect.And reinforcing bar is exactly common ferrimagnet, under normal condition, the concrete cover outside reinforcing bar can shield reinforcing bar
Magnetic signal, but behind concrete layer cracking generation crack, the magnetic signal at the place of cracking is not basically unchanged, but can be due to leakage permeance at cracking
Cause magnetic signal that can occur obviously to fluctuate, and the width middle position magnetic flux leakage in crack is maximum, magnetic signal will appear peak value.Therefore according to
Above-mentioned theory, we can differentiate, the width that fluctuate one section of width is exactly crack occur, and the peak value of magnetic signal fluctuation is exactly
The width in crack is to midpoint.The present invention is namely based on above-mentioned principle and proposes measuring device and measurement method.
It, can width clear, complete, that crack is accurately shown in polar coordinate system using technical solution of the present invention
Center line, the width centreline can be with the length and trend in accurate Characterization crack；And the program has also clearly known each survey
The developed width of amount point, and by after the ipsilateral endpoint connection of whole developed width line segments, just intuitively, completely, clearly obtain
Two contour lines in crack.In this way, having grasped fracture length, trend, the parameters such as width of each node, can be repaired to be subsequent
It mends work and full and accurate effective foundation is provided, made convenient for construction personnel according to the concrete condition in crack with strong points, complete, effective
Repairing, the emphasis grouting mending if certain section of crack is wide, certain section of crack surface Zhai Ze applying mortar；And due to grasping crack
Overall picture, mending course will not slip, and increase substantially crack repairing effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the measuring device of the fracture pattern of Reinforced Concrete Bridge of the present invention.
Fig. 2 is the structural schematic diagram after Fig. 1 deflection certain angle.
Fig. 3 is the configuration schematic diagram of the trolley of the measuring device of the fracture pattern of Reinforced Concrete Bridge of the present invention.
Fig. 4 is the trolley of measurement method of the invention by the overlooking structure diagram in crack.
Fig. 5 is the amplification overlooking structure diagram that the rack gear of measurement method of the invention is parked in the widthwise central in crack.
Fig. 6 is that the swing rod of measurement method of the invention revolves the amplification overlooking structure diagram to turn around.
Fig. 7 is signal when being fitted fracture pattern in measurement method of the invention using the polar coordinates of pole and measurement point
Figure.
As shown in the figure 1, track, 2, trolley, the 3, first motor, 4, turntable, the 5, first Magnetic Sensor, 6, guide groove,
7, rack gear, 8, notch, 9, contour line, the 10, second motor, 11, gear, the 12, second Magnetic Sensor, 13, third motor,
14, swing rod, 15, third Magnetic Sensor, 16, pole, 17, measurement point, 18, width centreline, 19, developed width line segment.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Figure 1, Figure 2, Figure 3 shows, the measuring device of the fracture pattern of Reinforced Concrete Bridge of the present invention, it includes along steel
The track 1 that Concrete Beam Reinforced length direction is laid with and the trolley 2 being slidably fitted in track 1；The traveling of the trolley 2 can use
Motor drive or cable traction.
Trolley 2 is equipped with the turntable 4 driven through the first motor 3, and specifically, the first motor 3 is mounted on trolley 2
Interior, the output shaft of the first motor 3 and the cooperation of turntable 4 are driven.The output shaft of first motor 3 is equipped with and is used for
Measure the first angle-position encoder of the output shaft angle.
4 roof center of turntable is equipped with the first Magnetic Sensor 5.Guide groove 6, sliding in guide groove 6 are through in turntable 4
It is combined with rack gear 7, a side wall of guide groove 6 is equipped with notch 8, is equipped with the gear 11 driven through the second motor 10 in notch 8,
The gear 11 and rack gear 7 are intermeshed；Specifically, the second motor 10 is fixed on 4 top plate of turntable, and output shaft passes through
Top plate protrudes into fixed with gear 11 in notch 8.
7 front end of rack gear is equipped with the second Magnetic Sensor 12 and third motor 13, and specifically, the second Magnetic Sensor 12 is fixed
At the top of the output shaft of third motor 13.Swing rod 14 is fixed on the output shaft of third motor 13, third motor 13
Output shaft is equipped with the second angle-position encoder of the pivot angle for measuring oscillating bar 14, and 14 free end of swing rod is equipped with third Magnetic Sensor
15。
By common sense it is found that the measuring device is additionally provided with master controller, such as plc chip or host computer, certainly, the present embodiment
Host computer preferably with display screen, three above-mentioned Magnetic Sensors, three motor and two angle-position encoders with electricity
The connection of brain server signal.Magnetic Sensor in the application is commercially available Hall sensor.
Also require emphasis a bit, the plate of multilayer permalloy be all coated with outside whole motor of the application, this be for
Interference of the magnetic field of shielded motor to measurement process, it is ensured that measurement accuracy itself.
The method for measuring distress in concrete form based on measuring device of the present invention, its step are as follows.
A, as shown in figure 4, trolley 2 advances along track 1, when the first Magnetic Sensor 5 detects magnetic signal fluctuation, before expression
Into direction there are crack, parking when the magnetic signal fluctuation of the first Magnetic Sensor 5 is to reach to peak value, and using parking position as polar coordinates
Pole 16, and from pole 16 draw a ray vertical with 2 direction of advance of trolley as polar axis.
Trolley 2 in the step is described in detail, and, by the process in crack, the magnetic signal value of the first Magnetic Sensor 5 is flat in normal region
Steady almost straight, when close to crack center, magnetic signal value can be lifted, magnetic signal value when Magnetic Sensor reaches crack center
Reach peak value, can fall far from crack center magnetic signal value, therefore rises and falls regularly and constitute the fluctuation of a signal value.
The process of trolley parking is first constantly to advance in fact, and discovery magnetic signal starts drop, and then reversing returns to where peak value
Position.
B, as shown in figure 5, the second motor 10 of starting, so that rack gear 7 stretches out 6 open front of guide groove, then drives the first electricity
Motivation 3 rotates rack gear 7, when the second Magnetic Sensor 12 identifies magnetic signal fluctuation for the first time, indicates that 7 front end of rack gear is crossed over for the first time and splits
Seam stops rack gear 7 when the magnetic signal fluctuation of the second Magnetic Sensor 12 is to reach to peak value, at this point, with the preceding elongation of rack gear 7 and rotation
Angle of the sum of 4 radius of platform as polar diameter and when the stopping of rack gear 7 between polar axis obtains the pole of first measurement point 17 as polar angle
Coordinate；And by Such analysis it is found that the measurement point 17 is located on the width bisector in crack.
It for ease of understanding, is O point by pole indicia in Fig. 5, polar axis is labeled as ray OX, and polar angle is labeled as α.
In the step, the first angle-position encoder can obtain rack gear 7 from polar axis, stop when to magnetic signal peak value, the rotation of rack gear 7
Gyration, i.e. polar angle.
And there are many extension measurement of length mode about rack gear 7, such as add a displacement sensor in 4 front end of rack gear,
By measuring the displacement sensor at a distance from 4 side disc of turntable, so that it may the accurate preceding elongation for obtaining rack gear 7, in turn
It is added with 4 radius of turntable and obtains polar diameter length.
C, as shown in fig. 6, starting third motor 13, makes swing rod 14 rotate a circle around first measurement point 17, swing rod 14
Free end can cross over crack twice, make the magnetic signal of third Magnetic Sensor 15 that two secondary undulations occur, the second angle-position encoder can be surveyed
The corresponding pendulum angle variable ⊿ θ of swing rod 14 when 15 every secondary undulation of third Magnetic Sensor out, by the corresponding pendulum angle variable ⊿ θ of every secondary undulation
θ/360 Width Formula of Rib Knitted Fabric L=2 π r ⊿ are brought into 14 radius r of swing rod, so that it may obtain the width that swing rod 14 crosses over crack every time；This
Sample just obtains two fracture widths of first 17 two sides of crack measurement point, and the average value of two fracture widths is exactly that crack exists
The developed width of the measurement point 17.
The acquisition process of single pendulum angle variable ⊿ θ is described in detail, when swing rod 14 rotates, when the magnetic signal of third Magnetic Sensor 15
For value from level to lifting, the second angle-position encoder will record the corresponding pivot angle value θ of inflection point for starting fluctuation1, equally, when third magnetic
The magnetic signal value of sensor 15 will record the corresponding pivot angle value of inflection point for terminating fluctuation from level, the second angle-position encoder is dropped to
θ2, two pivot angle values are subtracted each other to the pendulum angle variable ⊿ θ for just obtaining every secondary undulation.
D, it keeps the preceding elongation of rack gear 7 constant, continues rotated rack 7, when the second Magnetic Sensor 12 again identifies that magnetic
It when signal fluctuation, indicates that crack is crossed in 7 front end of rack gear again, stops when the magnetic signal fluctuation of the second Magnetic Sensor 12 is to reach to peak value
Rack gear 7, at this point, since preceding elongation is constant, therefore polar diameter is remained unchanged with the polar diameter in step b, with this moment between rack gear 7 and polar axis
Angle as polar angle, obtain the polar coordinates of second crack measurement point 17.
E, driving swing rod 14 rotates a circle around second measurement point 17, and 14 free end of swing rod can cross over crack twice, and second
14 corresponding two pendulum angle variable ⊿ θ of swing rod when angle-position encoder can measure 15 liang of secondary undulations of third Magnetic Sensor put two
Angle variable brings Width Formula of Rib Knitted Fabric into respectively, to obtain two fracture widths of second 17 two sides of crack measurement point, and then obtains the
The developed width of two measurement points 17.
F, drive rack 7 continues to stretch out a fixed intervals value to form new preceding elongation, then rotated rack 7, and second
Magnetic Sensor 12 identifies magnetic signal fluctuation, and stops rack gear 7 when magnetic signal fluctuation is to reach to peak value, with the new preceding elongation of rack gear 7
The angle of the sum of degree and 4 radius of turntable as new polar diameter and when the stopping of rack gear 7 between polar axis obtains next as polar angle
The polar coordinates of crack measurement point 17.
G, driving swing rod 14 rotates a circle around next measurement point 17, and 14 free end of swing rod can cross over crack twice, and second
14 corresponding two pendulum angle variable ⊿ θ of swing rod, are distinguished when angle-position encoder can measure 15 liang of secondary undulations of third Magnetic Sensor
It brings Width Formula of Rib Knitted Fabric into, to obtain two fracture widths of next 17 two sides of crack measurement point, and then obtains next measurement point
17 developed width.
H, it keeps the preceding elongation of rack gear 7 constant, continues rotated rack 7, the second Magnetic Sensor 12 again identifies that magnetic signal
Fluctuation, and stop rack gear 7 when magnetic signal fluctuation is to reach to peak value, keep the polar diameter in step f constant, with rack gear 7 and pole this moment
The angle of between centers is as polar angle, the polar coordinates of next crack measurement point 17 under acquisition.
I, the driving next measurement point 17 under of swing rod 14 rotates a circle, and 14 free end of swing rod can cross over crack twice, and second
14 corresponding two pendulum angle variable ⊿ θ of swing rod, are distinguished when angle-position encoder can measure 15 liang of secondary undulations of third Magnetic Sensor
Bring Width Formula of Rib Knitted Fabric into, with obtain under next 17 two sides of crack measurement point two fracture widths, and then obtain under next measurement point
17 developed width.
J, step f~i is repeated, and is often repeated once and can obtain two new crack measurement points 17 and corresponding two reality
Width；When extension simultaneously rotated rack 7 again, the identification of the second Magnetic Sensor 12 is fluctuated less than magnetic signal, illustrates to have measured
To the end in the crack.
Emphasize a concept herein, i.e. drive rack 7 continues the fixed intervals value stretched out every time, the size of the spacing value,
It will determine the precision of the measurement method, when such as needing accuracy higher, continue the smaller of the fixed intervals value stretched out choosing every time, then
Pendulous frequency is more, and the crack measured is more accurate, and if accuracy requirement is less high, then the choosing of fixed intervals value is larger, and measurement is secondary
Number is relatively smaller, the crack relative poor measured.
K, as shown in fig. 7, being connected pole 16 and whole cracks measurement point 17 with smooth curve in polar coordinate system
Come, the width centreline 18 of characterization fracture strike is obtained with this, which is completed by host computer, and is shown over the display.
The reality of the point is described in detail by taking any one measurement point 17 as an example in the developed width line segment 19 for drawing each measurement point 17
The technique of painting of border width line segment 19, is the center of circle with pole 16, draws circle Jing Guo the measurement point 17, and make the circle tangent line and
The tangent line intercepts a line segment also cross the measurement point 17 on the tangent line, which is equal to the reality of the measurement point 17
Border width, and the measurement point 17 is located among the line segment, which is exactly the developed width line segment 19 of the point.
The ipsilateral endpoint smoothed curve connection of whole developed width line segments 19 is obtained to the contour line 9 in crack again.?
That is a contour line 9 is connected out with the endpoint of whole 19 sides of developed width line segment, it is another with whole developed width line segments 19
The endpoint of side connects out another contour line 9.The step can also be completed by host computer and be shown over the display.
In conclusion above-mentioned technical proposal has accurately measured the contour line 9 in crack, width centreline 18, measurement point
The information such as developed width, to symbolize the form in crack.
Claims (2)
1. a kind of measuring device of the fracture pattern of Reinforced Concrete Bridge, it is characterised in that: it includes along reinforced beam
The track (1) that length direction is laid with and the trolley (2) being slidably fitted in track (1)；Trolley (2) is equipped with through the first motor
(3) turntable (4) driven, the output shaft of the first motor (3) are equipped with the first angle-position encoder, in turntable (4) top plate
The heart is equipped with the first Magnetic Sensor (5)；It is through with guide groove (6) in turntable (4), is sliding combined with rack gear in guide groove (6)
(7), a side wall of guide groove (6) is equipped with notch (8), and the gear driven through the second motor (10) is equipped in notch (8)
(11), the gear (11) and rack gear (7) are intermeshed；Rack gear (7) front end is equipped with the second Magnetic Sensor (12) and third motor
(13), it is fixed with swing rod (14) on the output shaft of third motor (13), the output shaft of third motor (13) is equipped with second
Angle-position encoder, swing rod (14) free end are equipped with third Magnetic Sensor (15).
2. a kind of method for measuring distress in concrete form based on measuring device described in claim 1, it is characterised in that:
Its step includes:
A, trolley (2) advances along track (1), when the first Magnetic Sensor (5) detects magnetic signal fluctuation, indicates that direction of advance is deposited
In crack, the parking when fluctuation of the magnetic signal of the first Magnetic Sensor (5) is to reach to peak value, and using parking position as polar pole
(16), and from pole (16) ray vertical with trolley (2) direction of advance is drawn as polar axis；
B, start the second motor (10), so that rack gear (7) stretches out guide groove (6) open front, then the first motor (3) is driven to make
Rack gear (7) rotation indicates that rack gear (7) front end is crossed over for the first time and splits when the second Magnetic Sensor (12) identifies magnetic signal fluctuation for the first time
Seam stops rack gear (7) when the magnetic signal fluctuation of the second Magnetic Sensor (12) is to reach to peak value, at this point, with the preceding elongation of rack gear (7)
With the sum of turntable (4) radius as polar diameter and rack gear (7) stop when and polar axis between angle as polar angle, obtain first survey
Measure the polar coordinates of point (17)；
C, start third motor (13), so that swing rod (14) is rotated a circle around first measurement point (17), swing rod (14) free end
Crack can be crossed over twice, makes the magnetic signal of third Magnetic Sensor (15) that two secondary undulations occur, and the second angle-position encoder can measure the
Swing rod (14) corresponding pendulum angle variable ⊿ θ when three Magnetic Sensors (15) every secondary undulation, by the corresponding pendulum angle variable ⊿ θ of every secondary undulation
θ/360 Width Formula of Rib Knitted Fabric L=2 π r ⊿ are brought into swing rod (14) radius r, so that it may obtain the width that swing rod (14) crosses over crack every time
Degree；In this way, just obtaining two fracture widths of first crack measurement point (17) two sides, the average value of two fracture widths is exactly
Developed width of the crack in the measurement point (17)；
D, it keeps the preceding elongation of rack gear (7) constant, continues rotated rack (7), when the second Magnetic Sensor (12) again identifies that
When magnetic signal fluctuates, indicate that crack is crossed in rack gear (7) front end again, the magnetic signal of the second Magnetic Sensor (12) is fluctuated to reach to peak value
When stop rack gear (7), at this point, polar diameter is remained unchanged with the polar diameter in step b, with the angle work between rack gear this moment (7) and polar axis
For polar angle, the polar coordinates of second crack measurement point (17) are obtained；
E, driving swing rod (14) rotates a circle around second measurement point (17), and swing rod (14) free end can cross over crack twice, the
Swing rod (14) corresponding two pendulum angle variable ⊿ θ when two angle-position encoders can measure third (15) two secondary undulation of Magnetic Sensor, will
It brings Width Formula of Rib Knitted Fabric into respectively, to obtain two fracture widths of second crack measurement point (17) two sides, and then obtains second
The developed width of a measurement point (17)；
F, drive rack (7) continues to stretch out a fixed intervals value to form new preceding elongation, then rotated rack (7), and second
Magnetic Sensor (12) identifies magnetic signal fluctuation, and stops rack gear (7) when magnetic signal fluctuation is to reach to peak value, new with rack gear (7)
The angle of the sum of preceding elongation and turntable (4) radius as polar diameter and when rack gear (7) stopping between polar axis is obtained as polar angle
The polar coordinates of next crack measurement point (17)；
G, driving swing rod (14) rotates a circle around next measurement point (17), and swing rod (14) free end can cross over crack twice, the
Swing rod (14) corresponding two pendulum angle variable ⊿ θ when two angle-position encoders can measure third (15) two secondary undulation of Magnetic Sensor, will
It brings Width Formula of Rib Knitted Fabric into respectively, to obtain two fracture widths of next crack measurement point (17) two sides, and then obtains next
The developed width of a measurement point (17)；
H, it keeps the preceding elongation of rack gear (7) constant, continues rotated rack (7), the second Magnetic Sensor (12) again identifies that magnetic is believed
Number fluctuation, and stop rack gear (7) when magnetic signal fluctuation is to reach to peak value, keep the polar diameter in step f constant, with rack gear this moment
(7) angle between polar axis is as polar angle, the polar coordinates of next crack measurement point (17) under acquisition；
I, driving swing rod (14) next measurement point (17) under rotates a circle, and swing rod (14) free end can cross over crack twice, the
Swing rod (14) corresponding two pendulum angle variable ⊿ θ when two angle-position encoders can measure third (15) two secondary undulation of Magnetic Sensor, will
It brings Width Formula of Rib Knitted Fabric into respectively, with two fracture widths of next crack measurement point (17) two sides under acquisition, and then is descended down
The developed width of a measurement point (17)；
J, step f~i is repeated, and is often repeated once and can obtain two new crack measurement points (17) and corresponding two practical width
Degree；When extension simultaneously rotated rack (7) again, the second Magnetic Sensor (12) identification is fluctuated less than magnetic signal；
K, pole (16) and whole crack measurement points (17) are connected with line in polar coordinate system, characterization crack is obtained with this
The width centreline (18) of trend, and the developed width line segment (19) of each measurement point (17) is drawn, by whole developed width lines
The ipsilateral endpoint line of section (19) is connected to obtain the contour line (9) in crack.
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