CN102337721A - Pavement deflection measurement device and measurement method thereof - Google Patents
Pavement deflection measurement device and measurement method thereof Download PDFInfo
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- CN102337721A CN102337721A CN2011102765019A CN201110276501A CN102337721A CN 102337721 A CN102337721 A CN 102337721A CN 2011102765019 A CN2011102765019 A CN 2011102765019A CN 201110276501 A CN201110276501 A CN 201110276501A CN 102337721 A CN102337721 A CN 102337721A
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Abstract
The invention relates to a pavement deflection measurement device and a measurement method thereof. The pavement deflection measurement device comprises an acceleration meter, a data collection card, a processor and output equipment, wherein the acceleration meter is buried in a surface layer of the pavement to be measured and is connected with the data collection card through a signal wire, the data collection card is connected with a communication interface of the processor, and the processor is also connected with the output equipment. The acceleration meter burying method is adopted, the acceleration meter is pre-buried in the surface layer of the soft pavement, the pavement deflection speed during the heavy duty truck milling is directly collected in real time, the dynamic collection of deflection values is realized, and the deflection values can be used as the calibration reference values of Benkelman beams. Compared with the traditional pavement deflection calibration mode, the method has the advantages that the influence caused by external collection environment is avoided, the measurement precision is improved, the measurement efficiency is also improved, and very wide practicability and universality are realized.
Description
Technical field
The present invention relates to nondestructive testing of highway subgrade road surface and assessment technique field, be specifically related to a kind of pavement deflection measurement mechanism and measuring method thereof.
Background technology
It is the basis that the road surface bearing capacity is estimated that pavement deflection detects with analyzing; It is the important component part of road surface functional performance evaluation; It is not only most important to check and Control Engineering quality; And the scientific level of decision road network Maintenance Decision making, directly influence the reasonability of maintenance fund allocation and old road improvement and design.
At present the method for testing of deflection value is a lot, Beckman beam method for example, FWD, autodeflectometer inspection vehicle etc.Beckman beam method when image data, needs reference geographical environment at that time, road environment, and weather conditions etc. are done the correction in later stage, and in measuring process, owing to be artificial reading, also can produce very big error effect so read the numerical value of dial gage.The basic principle that FWD is measured pavement deflection is to use the weight of certain mass; Freely fall loaded plate of hammering and act on the road surface with certain rigidity; Then with the exertin sensor with press the displacement transducer that certain distance arranges and measure suffered impact force and the deformation response of road table, i.e. deflection basin.Thereby can be according to the modulus of these each layers of data inverse road structure, as the evaluation foundation of road pavement bulk strength.But it is poor that this method exists data stability, because the measure error that systematic error causes is big, and transportation inconvenience, shortcomings such as poor practicability.In addition; Existing various measuring methods, the interference that receives human factor and external environment factor is very big, and the collection of data is set of single employing point; So need adopt point to expend the regular hour at each; This needs road closure with regard to requiring measured highway division, has not only influenced the fluency of traffic, concerning the testing staff, also has certain danger.
Summary of the invention
Technical problem to be solved by this invention provides a kind of pavement deflection measurement mechanism and measuring method thereof, and it is accurately low to overcome existing measurement, measures the defective that is subject to the human factor influence.
For solving the problems of the technologies described above; The present invention at first provides a kind of pavement deflection measurement mechanism, it is characterized in that, comprises accelerometer, data collecting card, processor, output equipment; Said accelerometer is embedded in the surface layer on road surface to be measured; Connect said data collecting card through holding wire, said data collecting card is connected the communication interface of said processor, and said processor also connects said output equipment.Said processor receives the pavement deflection acceleration of the said accelerometer measures of said data collecting card sampling, calculates the pavement deflection of said accelerometer position, through said output equipment output.
As the technical scheme of optimizing, this pavement deflection measurement mechanism also comprises spill seat, cover plate; Said accelerometer is installed in the spill seat; Said cover plate covers on said accelerometer, and said spill seat embeds in the surface layer on road surface to be measured, and said cover plate is positioned at the below, road surface.
The present invention provides the measuring method of above-mentioned pavement deflection measurement mechanism simultaneously, it is characterized in that, may further comprise the steps:
(1), on highway section to be measured, choose certain tested point, on this tested point, hole, said accelerometer is imbedded in the surface layer in the hole, the holding wire of accelerometer causes the roadside through grooving; Fill and lead up this hole and grooving with surface material or resin material then;
(2), the holding wire of degree of will speed up meter connects said data collecting card in the roadside, said data collecting card and processor, processor and output equipment assembling, bogie rests in the tested point rear, prepares at any time to measure;
(3), start Acquisition Processor and data collecting card; The data of the said accelerometer of preparation for acquiring, the driver starts bogie, drives towards said accelerometer position; Bury a distance underground when the said accelerometer of said bogie distance, start the data acquisition of said accelerometer;
(4), behind the said bogie axial compression cross said accelerometer bury a certain distance underground after, promptly slowing down stops.
(5), cut off the data acquisition of accelerometer;
(6), said processor carries out computing, calculates the flexure a little of burying underground of said accelerometer, and sends to output equipment output.
The measuring principle of above-mentioned measuring method is: bogie passes through near the tested point and pressed in the process of this tested point; Because the distortion on soft road surface extruding is transmitted on the accelerometer; Accelerometer can send the signal of telecommunication of variation; Be the acceleration of roadbed subsidence, the acceleration of establishing the roadbed subsidence of accelerometer sampling is a, then the roadbed subsidence speed v
Δ t=v
0+ a Δ t, roadbed subsidence amount s
Δ t=v
0Δ t+a Δ t
t/ 2.Promptly utilize the single-point integration, find the solution the deflection value at tested point place.
The value that obtains with these computational methods is the true deflection value on road surface, can compare with the deflection value that its Beckman beam flexure method is measured, and as the foundation of its demarcation.
Accelerometer of the present invention is buried method underground, and degree of will speed up meter is embedded in the surface layer, and automatic data collection does not receive the influence of artificial reading and external environment factor, has improved collection reliability, accuracy.Be different from single-point under the existing heavy load and impact the method that the road surface obtains deflection value, this method is when gathering the pavement deflection value, and whole gatherer process is dynamically continuous, has guaranteed accuracy.In addition, good reproducibility of the present invention is convenient to the long-term monitoring and detection of road pavement.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment technical scheme of the present invention is further specified.
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the structure sectional view of T type settlement gauge of the present invention.
Fig. 3 removes the vertical view of cover plate for T type settlement gauge of the present invention.
Fig. 4 does not install the stereogram of accelerometer for T type settlement gauge of the present invention.
The specific embodiment
In conjunction with structural representation shown in Figure 1; This device comprises some accelerometers---first accelerometer 1, second accelerometer 2, the 3rd accelerometer 3, the 4th accelerometer 4; Each accelerometer is connected to data collecting card through controller, and data collecting card adopts the portable data acquisition card; The portable data acquisition card is installed in the computer, and computer plays the effect of processor and output equipment.Said accelerometer is embedded in the surface layer on road surface to be measured, connects said data collecting card through holding wire, and said data collecting card is connected the communication interface of said processor, and said processor also connects said output equipment.
In conjunction with Fig. 2,3, the T type settlement gauge shown in 4; T type settlement gauge comprises accelerometer 13, spill seat 12, cover plate 11; Each accelerometer 13 is placed in the spill seat 12; Put cover plate 11 above the accelerometer, spill seat 12 is provided with a U-shaped opening, is convenient to connect from the side and the holding wire of speedometer.
As shown in Figure 2 again; In the scene on road surface to be measured is arranged; Choose one section 4 meters long experiment highway section, choose a survey mark position arbitrarily, use drill to bore the hole of a diameter in the survey mark position as 60mm; The T type settlement gauge that accelerometer is housed is imbedded in the surface layer 14 of road, and making rigidity spill seat 12 is 20-25mm apart from the degree of depth on road surface 10.T type settlement gauge is bonded in the circular hole of road surface with the epoxide-resin glue of black, and with the epoxide-resin glue or the pitch of black this circular hole is filled and led up the height identical to the road surface.The holding wire of accelerometer causes through grooving on the road surface in the junction box in roadside, after holding wire is imbedded this groove, also with the epoxide-resin glue of black this groove is filled and led up.The signal line terminal of accelerometer is put into a junction box of imbedding the roadside, and carries out the connection plug with data collecting card, and this junction box is waterproof.
After on-the-spot charity was accomplished, the cable of acquired signal was guided to the roadside, so in gatherer process, do not need road closure, did not also need staff's image data on highway, only needed a staff, and in the safety area, roadside, the computer image data is gathered in operation.The fluency of highway transportation and operating personnel's self safety have been improved greatly.
When preparation need be done the pavement deflection test,, the collection computer of data collecting card is housed just with controller; Be placed on the safety area, roadside; Connect all electric cables, when load-carrying vehicle was pressed the road surface that is embedded with accelerometer, just can image data.After data acquisition finishes, controller and the dismounting of collection computer are removed, the wiring terminal of accelerometer places in the link box in roadside, need not remove, and can be used for test use next time.When needing image data at every turn, only need place in the roadside and gather computer and some holding wires, just can gather, time saving and energy saving, the road structure of being convenient to the whole highway section of long term monitoring changes.If monitoring finishes, can pre-buried accelerometer and T type settlement gauge be taken out, reuse, reduced cost.
The measuring method of above-mentioned pavement deflection measurement mechanism may further comprise the steps:
(1), on highway section to be measured, choose certain tested point, on this tested point, hole, said accelerometer is imbedded in the surface layer in the hole, the holding wire of accelerometer causes the roadside through grooving; Fill and lead up this hole and grooving with surface material or resin material then;
(2), the holding wire of degree of will speed up meter connects said data collecting card in the roadside, said data collecting card and processor, processor and output equipment assembling, bogie rests in the tested point rear, prepares at any time to measure.
(3), start Acquisition Processor and data collecting card; The data of the said accelerometer of preparation for acquiring, the driver starts bogie, drives towards said accelerometer position; Bury a 100m distance underground when the said accelerometer of said bogie distance, start the data acquisition of said accelerometer;
(4), behind the said bogie axial compression cross said accelerometer bury a 10m underground after, promptly slowing down stops.
(5), stop and the data acquisition of speedometer,
(6), said processor carries out computing, calculates the flexure a little of burying underground of said accelerometer, and sends to output equipment output.
In order to verify the feasibility of measuring method of the present invention, it is right to adopt the inventive method and Beckman beam method to carry out marked ratio, and control experiment adopts above-mentioned two kinds of methods, has measured the flexure of four test points respectively, and the result is following:
1, Beckman beam test result
The Beckman beam is in the measurement result at initial point place:
2, accelerometer of the present invention is buried the initial data that method is measured underground
Wherein A17152 is first pre-buried accelerometer model, and three the pre-buried some models in back are followed successively by A17156, A17157, A17161.Initial data is following:
A17152 A17156 A17157 A17161
1.02138 1.09706 1.04631 1.05819
1.02152 1.09724 1.04618 1.05819
1.02166 1.09742 1.04604 1.05819
··· ··· ··· ···
··· ··· ··· ···
··· ··· ··· ···
1.02471 1.10054 1.04379 1.05827
1.02489 1.10068 1.04369 1.05828
1.02507 1.10083 1.04358 1.05828
1.02525 1.10097 1.04348 1.05829
1.02544 1.10111 1.04338 1.05829
1.02563 1.10126 1.04329 1.0583
1.02582 1.10139 1.04319 1.0583
1.02601 1.10153 1.04309 1.05831
3, accelerometer of the present invention is buried each accelerometer single-point integral displacement data (0.01mm of unit) of single-point integral and calculating speed displacement rear axle process of method underground
4, comparative analysis as a result
The interpretation record sheet is as follows:
Above 5 engineerings are done a difference analysis, and analysis result is following:
Can obtain from above-mentioned analysis, the Beckman beam data that each engineering collects and the standard deviation of accelerometer data are being about 1, and promptly error is at 1 deflection value (0.01mm of deflection value unit).Explain that the present invention has good accuracy.
It should be noted last that; The above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. pavement deflection measurement mechanism; It is characterized in that; Comprise accelerometer, data collecting card, processor, output equipment, said accelerometer is embedded in the surface layer on road surface to be measured, connects said data collecting card through holding wire; Said data collecting card is connected the communication interface of said processor, and said processor also connects said output equipment.
2. pavement deflection measurement mechanism according to claim 1 is characterized in that, also comprises the spill seat; Cover plate, said accelerometer are installed in the spill seat, and said cover plate covers on said accelerometer; Said spill seat embeds in the surface layer on road surface to be measured, and said cover plate is positioned at the below, road surface.
3. the measuring method of claim 1 or 2 said pavement deflection measurement mechanisms is characterized in that, may further comprise the steps:
(1), on highway section to be measured, choose certain tested point, on this tested point, hole, said accelerometer is imbedded in the surface layer in the hole, the holding wire of accelerometer causes the roadside through grooving; Fill and lead up this hole and grooving with surface material or resin material then;
(2), the holding wire of degree of will speed up meter connects said data collecting card in the roadside, said data collecting card and processor, processor and output equipment assembling, bogie rests in the tested point rear, prepares at any time to measure;
(3), start Acquisition Processor and data collecting card; The data of the said accelerometer of preparation for acquiring, the driver starts bogie, drives towards said accelerometer position; Bury a distance underground when the said accelerometer of said bogie distance, start the data acquisition of said accelerometer;
(4), behind the said bogie axial compression cross said accelerometer bury a certain distance underground after, promptly slowing down stops;
(5), cut off the data acquisition of accelerometer;
(6), said processor carries out computing, calculates the flexure a little of burying underground of said accelerometer, and sends to output equipment output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102765019A CN102337721A (en) | 2011-09-16 | 2011-09-16 | Pavement deflection measurement device and measurement method thereof |
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|---|---|---|---|
| CN2011102765019A CN102337721A (en) | 2011-09-16 | 2011-09-16 | Pavement deflection measurement device and measurement method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236761A (en) * | 2014-09-10 | 2014-12-24 | 同济大学 | Method for measuring force transmission coefficients based on concrete road flexure |
| CN107992048A (en) * | 2017-12-19 | 2018-05-04 | 成都圭目机器人有限公司 | A kind of method of robot system detection road surface rebound deflection value |
| WO2020147180A1 (en) * | 2019-01-15 | 2020-07-23 | 武汉武大卓越科技有限责任公司 | Crossbeam for measuring speed of deformation of surface of material under dynamic load |
| CN112523045A (en) * | 2020-12-01 | 2021-03-19 | 同济大学 | Acceleration array-based cement concrete pavement flatness monitoring structure and method |
| US11338630B2 (en) * | 2015-12-04 | 2022-05-24 | Pavement Analytics Limited | Method and system for measuring deformation of a surface |
Citations (4)
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|---|---|---|---|---|
| JPH10141937A (en) * | 1996-11-07 | 1998-05-29 | Tokimec Inc | Instrument and method for measuring deflection of road surface |
| JP2002536659A (en) * | 1999-02-11 | 2002-10-29 | メガスケール アクティエボラーグ | Measuring apparatus and measuring method for measuring load bearing capacity of road surface |
| CN201508166U (en) * | 2009-09-24 | 2010-06-16 | 宁波杉工结构监测与控制工程中心有限公司 | Fiber-grating pavement strain transducer |
| CN102162217A (en) * | 2010-11-18 | 2011-08-24 | 武汉武大卓越科技有限责任公司 | Laser dynamic deflection survey vehicle |
-
2011
- 2011-09-16 CN CN2011102765019A patent/CN102337721A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141937A (en) * | 1996-11-07 | 1998-05-29 | Tokimec Inc | Instrument and method for measuring deflection of road surface |
| JP2002536659A (en) * | 1999-02-11 | 2002-10-29 | メガスケール アクティエボラーグ | Measuring apparatus and measuring method for measuring load bearing capacity of road surface |
| CN201508166U (en) * | 2009-09-24 | 2010-06-16 | 宁波杉工结构监测与控制工程中心有限公司 | Fiber-grating pavement strain transducer |
| CN102162217A (en) * | 2010-11-18 | 2011-08-24 | 武汉武大卓越科技有限责任公司 | Laser dynamic deflection survey vehicle |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236761A (en) * | 2014-09-10 | 2014-12-24 | 同济大学 | Method for measuring force transmission coefficients based on concrete road flexure |
| US11338630B2 (en) * | 2015-12-04 | 2022-05-24 | Pavement Analytics Limited | Method and system for measuring deformation of a surface |
| CN107992048A (en) * | 2017-12-19 | 2018-05-04 | 成都圭目机器人有限公司 | A kind of method of robot system detection road surface rebound deflection value |
| WO2020147180A1 (en) * | 2019-01-15 | 2020-07-23 | 武汉武大卓越科技有限责任公司 | Crossbeam for measuring speed of deformation of surface of material under dynamic load |
| CN112523045A (en) * | 2020-12-01 | 2021-03-19 | 同济大学 | Acceleration array-based cement concrete pavement flatness monitoring structure and method |
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Application publication date: 20120201 |