CN2506690Y - Apparatus for measuring asphalt road surface microdeformation - Google Patents
Apparatus for measuring asphalt road surface microdeformation Download PDFInfo
- Publication number
- CN2506690Y CN2506690Y CN 01265822 CN01265822U CN2506690Y CN 2506690 Y CN2506690 Y CN 2506690Y CN 01265822 CN01265822 CN 01265822 CN 01265822 U CN01265822 U CN 01265822U CN 2506690 Y CN2506690 Y CN 2506690Y
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- photoelectric sensor
- photocell
- light source
- flexible pavement
- utility
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Abstract
A micro-deformation measuring device for asphalt pavement is provided, comprising a light source, a photoelectric sensor, a data processing circuit, and a display device. The optical path between the light source and the photoelectric sensor is provided with a parallel light spot emitting source which consists of a lens and a shadow shield, which is provided with a square hole. The photoelectric sensor is connected with a miscellaneous light compensator; the output end of the photoelectric sensor is connected with the data processing circuit and the display device. The utility model uses a photocell as the photoelectric sensor to form an asphalt pavement index digital detector, which can detect the asphalt pavement, particularly the different indexes of the asphalt pavement of high grade roads, such as deflection, smoothness, rutting, as well as formation factor, etc. The utility model uses photocell as the sensor, therefore the reaction is sensitive. The utility model can insure measuring accuracy when measuring under any road conditions, and the utility model has the advantages of simple structure, small size, light weight, and high accuracy.
Description
Technical field
The utility model relates to the asphalt highway micro-deformation measuring device.
Background technology
Flexible pavement is owing to construction, design, material cause and operating period loaded vehicle, and the influence of the car that particularly overloads produces and is deformed into unavoidably.From practice, the distortion of flexible pavement has following several types mostly: the first, and undaform or concave-convex type distortion.This distortion generally longitudinally changes, and is the most common in all distortion of flexible pavement.These distortion seriously descend surface evenness, the comfortableness of driving and deterioration of safety.The second, the rut type.This distortion owing to carry out canalized traffic, rutting deformation occurs along the cross directional variations on road easily on high-grade highway.It descends horizontal planarization, the difficulty of giving another the right of way, and driving is dangerous to be increased.The 3rd, the depression type.This distortion is caused by the degree of compaction and the strength deficiency of subgrade and pavement mostly, and pavement depression forms and jumps car, and road-ability and safety are reduced.Here alleged little distortion is with respect to the hollow place groove, and above-mentioned distortion has the feature than small deformation, so be called little distortion.In order to understand the distortion situation of flexible pavement, and control its development, in addition large deformation is proposed the plan of repairing, just need regular distortion to detect to flexible pavement, undoubtedly, this detection guarantees that for reducing the maintenance cost operate as normal of flexible pavement is significant.Detection method in " standard ", generally comparatively backward, testing the speed of having is slow, and personal safety can not get guaranteeing that the precision that has is not high during the measurement that has, affects the correct evaluation to the flexible pavement distortion more or less.Introduce overseas equipment, cost an arm and a leg (being about 300,000 dollars) as a table flatness instrument, and maintenance difficult.For this reason, domesticly develop modern flexible pavement deformation detection equipment voluntarily, important practical sense is just arranged.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, the flexible pavement micro-deformation measuring device that precision is higher.
Technical solution of the present utility model is: a kind of flexible pavement micro-deformation measuring device, comprise light source, photoelectric sensor and data processing circuit and display unit, described light source is provided with the parallel hot spot emission source of being made up of lens and the shadow shield which is provided with square hole with light path between the photoelectric sensor, photoelectric sensor is connected with the veiling glare expansion loop, and the photoelectric sensor output connects data processing circuit and display unit.
Described photoelectric sensor comprises photocell sheet or CCD sheet or position sensor, base and bracing frame, and bracing frame is fixed on the base, and photocell sheet and bracing frame are hinged by turning cylinder, and photocell sheet bottom is provided with balance weight.
Described veiling glare expansion loop adopts filter or two identical photocell sheet reversal connections or electric bridge to adjust circuit.
Described light source adopts generating laser or incandescent lamp, and lens adopt concavees lens or convex lens.
Photocell has the characteristic as the Digital Detecting sensor: the first, and photocell is penetrated down in illumination, and its illuminating area is directly proportional with length, and the second, photocell has higher certainty of measurement, and the resolution ratio of long measure is stronger.This specific character provides condition to Digital Detecting.The utility model utilizes photocell as photoelectric sensor, forms the digital detector of flexible pavement index, can detect flexible pavement with it, and the multiple index of high-grade highway flexible pavement particularly is as flexure, planeness, rut and construct coefficient etc.The utility model adopts photocell as sensor, is quick on the draw, and the little deflection in road surface reacts by the area change that light is radiated on the photocell, and photocell is converted into the curtage variable quantity with the illuminating area variation.When the utility model can realize that any pavement behavior is measured, guarantee certainty of measurement.The utility model is simple in structure, and volume is little, and is in light weight, the precision height.
Description of drawings
Fig. 1 is the utility model structural principle schematic diagram.
Fig. 2 is the photosensor structure schematic diagram.
Fig. 3 changes schematic diagram for angular deformation measuring principle angle.
Fig. 4 is an angular deformation measuring principle schematic diagram.
Fig. 5 is a vertical deformation measuring principle schematic diagram.
The specific embodiment
A kind of flexible pavement micro-deformation measuring device, comprise light source 1, photoelectric sensor 4 and data processing circuit and display unit 5, described light source 1 adopts generating laser or incandescent lamp, generating laser emission diameter is a 1mm left and right sides luminous point, incandescent lamp can be used 3V miniature bulb such as flashlight, it is a spot light, becomes the scattering form.Light source 1 is connected with voltage-stabilized power supply 6.Described light source 1 is provided with the parallel hot spot emission source of being made up of lens 2 and the shadow shield 3 which is provided with square hole with light path between the photoelectric sensor 4, when using LASER Light Source, adopts concavees lens, and the diffusion multiple is 1～50 times, and diffusion length is 1cm～600cm.When measuring, low coverage, during distance measuring, uses low diffusion multiple with the high multiple that enlarges.When with incandescent miniature bulb, with condenser or convex lens, the optically focused value 1cm～10cm apart from the time be 3cm.Aperture is a square or rectangular on the shadow shield 3.One length of side is 1cm～1.5cm, and another side also is 1～1.5cm.Shadow shield 3 is removable in lens 2 back, and displacement is 1cm～15cm.Photoelectric sensor 4 is general with photocell sheet 41, also available CCD sheet or position sensor, and this photocell sheet 41 is subjected to producing curtage after the illumination.Described photoelectric sensor 4 comprises photocell sheet or CCD sheet or position sensor 41, base 42 and bracing frame 43, photocell sheet 41 is square, every length of side 1cm～2cm, about short circuit current 100mA, open-circuit voltage is about 600mV, and bracing frame 43 is fixed on the base 42 by screw 47, base 42 play fixed supporting role, base 42 is a packaged type, is fixed on during close-in measurement and does certainly on dolly or the automobile, places on the road surface during telemetering.Bracing frame 43 is provided with aperture 46, and turning cylinder 44 inserts in the apertures 46, and photocell sheet 41 is hinged by turning cylinder 44 with bracing frame 43, and photocell sheet 41 moving axis 44 that can rotate rotates, and photocell sheet 41 bottoms are provided with balance weight 45.Balance weight 45 can move up and down, and is mainly damping usefulness, and up-down adjustment can reach best anti seismic efficiency.Photoelectric sensor 4 is connected with veiling glare expansion loop 7, and described veiling glare expansion loop 7 adopts filters or two identical photocell sheet reversal connections or Wheatstone bridge to adjust circuit.Photoelectric sensor 4 outputs connect data processing circuit and display unit 5.
The utility model measuring principle is as follows:
1, angular deformation is measured
Referring to Fig. 1, the directional light that light source 1 sends through lens 2 and shadow shield 3, be mapped on the photocell 4, after the 7 eliminating veiling glares interference of veiling glare expansion loop, remaining promptly is the using light photograph, because the utility model is installed onboard, when garage is walked, run into the distortion of the concavo-convex or recessing of flexible pavement, photocell 41 moving axis 44 that rotates rotates immediately, produces angle θ
i, cause that the quantity of illumination changes, situation of change as shown in Figure 3: in Fig. 3 (a), angle Right deviation, angle "Left"-deviationist among Fig. 3 (b).Find out that by Fig. 3 originally the quantity of illumination of AB face has become the quantity of illumination of AC face, had more the CD section face quantity of illumination, and this quantity of illumination is just because of producing angular deformation θ
iThe result.This angle θ
iAntitrigonometric function by right-angled triangle ABC is tried to achieve, and is represented by formula (1):
In the formula: AB is that initial light is shown up.
AC is the inclined-plane plane of illumination of caused corresponding angles distortion behind the surface deformation.
This θ
iThe direct relation of the deformation of unevenness amount on during angular distortion and road surface is represented by Fig. 4:
In rt Δ AFH and rt Δ EFG, ∠ E=∠ A=θ
i, and in fact the deflection of flexible pavement is exactly the opposite side FG (it is vertical with the road surface) among the rt Δ EFG, owing to obtain θ
iThe relation of angular deformation and road surface practical distortion is tried to achieve by following formula (2):
FG＝EF·sinθ
i＝EF·sincos
-1(AB/AC) (2)
In the formula: FG is flexible pavement deflection (perpendicular to the road surface, claiming the absolute altitude deflection again)
EF is car wheel base (10cm～300cm)
AB, AC symbolic significance are the same, detect by photocell.
If car in advancing, is selected suitable sampled point, then can obtain numerous angular deformation θ
iValue also can obtain numerous concavo-convex absolute altitude FG, and the input Computer Processing obtains the surface evenness meansquaredeviation at last, and can get international indicator IRI and jolt accumulated value by converting.
2, vertical deformation is measured
Entire measuring device is moved down from car, and photoelectric sensor is placed 6m place stress point, at this moment, the photocell sensor moves up and down, angular deformation θ
iBe zero, as shown in Figure 5:
By Fig. 5 (a), the initial quantity of illumination is the AC face, and after external force was removed, road surface resilience immediately returned to Fig. 5 (b) state, and at this moment, plane of illumination has become AC ', thereby the vertical deformation amount should be tried to achieve by following formula (3):
a＝AC′-AC (3)
In the formula: a is the illumination recruitment, the corresponding actual rebound deformation amount that is after the unloading of road surface.
AC ' is road surface, unloading back rebound deformation amount.
AC is the initial quantity of illumination.
Become the actual rebound deformation geometric sense in road surface by illumination recruitment a and try to achieve, and represent by formula (4) by demarcation:
L＝κ·a (4)
In the formula: the actual rebound deformation amount when L is the flexible pavement unloading, mm
A is the photoelectricity recruitment, mV
κ is a conversion coefficient, is tried to achieve mm/mV by demarcation.
Claims (4)
1, a kind of flexible pavement micro-deformation measuring device, comprise light source (1), photoelectric sensor (4) and data processing circuit and display unit (5), it is characterized in that: light source (1) is provided with the parallel hot spot emission source of being made up of lens (2) and the shadow shield which is provided with square hole (3) with light path between the photoelectric sensor (4), photoelectric sensor (4) is connected with veiling glare expansion loop (7), and photoelectric sensor (4) output connects data processing circuit and display unit (5).
2, flexible pavement micro-deformation measuring device as claimed in claim 1, it is characterized in that: described photoelectric sensor (4) comprises photocell sheet or CCD sheet or position sensor (41), base (42) and bracing frame (43), bracing frame (43) is fixed on the base (42), photocell sheet (41) is hinged by turning cylinder (44) with bracing frame (43), and photocell sheet (41) bottom is provided with balance weight (45).
3, flexible pavement micro-deformation measuring device as claimed in claim 1 is characterized in that: described veiling glare expansion loop (7) adopts filter or two identical photocell sheet reversal connections or electric bridge to adjust circuit.
4, flexible pavement micro-deformation measuring device as claimed in claim 1 is characterized in that: described light source (1) adopts generating laser or incandescent lamp, and lens (2) adopt concavees lens or convex lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01265822 CN2506690Y (en) | 2001-11-05 | 2001-11-05 | Apparatus for measuring asphalt road surface microdeformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01265822 CN2506690Y (en) | 2001-11-05 | 2001-11-05 | Apparatus for measuring asphalt road surface microdeformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2506690Y true CN2506690Y (en) | 2002-08-21 |
Family
ID=33672594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01265822 Expired - Fee Related CN2506690Y (en) | 2001-11-05 | 2001-11-05 | Apparatus for measuring asphalt road surface microdeformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2506690Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419810C (en) * | 2006-11-28 | 2008-09-17 | 武汉理工大学 | Device for collecting information of road section |
| CN103038154A (en) * | 2010-08-18 | 2013-04-10 | 罗伯特·博世有限公司 | Method and device for determining a travel height of a working machine |
| CN111364334A (en) * | 2019-12-19 | 2020-07-03 | 长沙理工大学 | Pavement neatness detection device for paving construction |
-
2001
- 2001-11-05 CN CN 01265822 patent/CN2506690Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419810C (en) * | 2006-11-28 | 2008-09-17 | 武汉理工大学 | Device for collecting information of road section |
| CN103038154A (en) * | 2010-08-18 | 2013-04-10 | 罗伯特·博世有限公司 | Method and device for determining a travel height of a working machine |
| CN111364334A (en) * | 2019-12-19 | 2020-07-03 | 长沙理工大学 | Pavement neatness detection device for paving construction |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |