Method for evaluating pavement flatness by using light irradiation curve area method

Abstract

The invention relates to a method for evaluating pavement flatness by a light irradiation curve area method, which comprises the following steps: S1, erecting a fixed bracket on a working vehicle, arranging a laser transmitter and a graphic recorder on the fixed bracket, and arranging the graphic recorder on one side of a path of laser emitted by the laser transmitter, adjusting the path of laser emitted by the laser emitter to coincide with the datum line of the graphic recorder; s2, the laser transmitter transmits laser to the road surface, the linear laser generates light and shadow changes on the road surface, the graph recorder records a plurality of graphs defined by the light and shadow changes of the laser on the road surface above and below the datum line, the sum of the areas of the graphs is calculated through software, the deformation amount is obtained, and the larger the deformation amount is, the larger the deformation amount is. The flatness of the road is poorer. The road damage severity is evaluated according to the size of the area generated when the road loses flatness and the laser rays describe the contour, and the test operation is simple.

Description

Technical Field

[0001] The present invention relates to road smoothness, and more particularly to a method for evaluating road surface smoothness by using a light irradiation curve area method. Background Art

[0002] Flatness is one of the important indicators of road construction quality and service level. Uneven road surface will increase driving resistance and cause additional vibration to vehicles. This vibration will cause driving bumps, affecting driving speed and safety, driving stability and passenger comfort. At the same time, the vibration will also exert impact force on the road surface, thereby aggravating damage to the road surface and car and wear of tires. Uneven road surface will accumulate rainwater and accelerate road damage. Therefore, the detection and evaluation of flatness is a very important part of highway construction and maintenance.

[0003] There are three types of instruments for measuring flatness: cross-section type, reaction type and inertial type. Cross-section type instruments measure the unevenness of the road surface, such as the commonly used three-meter ruler and continuous flatness meter; reaction type instruments measure the bumps caused by the unevenness of the road surface, such as laser plane scanners; inertial instruments are based on the inertial principle and equipped with non-contact precision optical distance measuring instruments, plus accelerometers, to measure the vertical acceleration of the vehicle body during movement, and use two measurement values ​​to measure the road surface conditions.

[0004] The three existing methods for measuring flatness all utilize relatively sophisticated instruments and are relatively complicated to operate, so it is necessary to propose a new test method to simplify the test steps. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for evaluating the flatness of a road surface by using the light irradiation curve area method. The severity of road damage is evaluated by the size of the area produced by the contour drawn by laser rays when the road loses its flatness. The test operation is simple.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] The method for evaluating the road surface flatness by using the light irradiation curve area method comprises the following steps:

[0008] S1. A fixed bracket is set up on the work vehicle, a laser emitter and a graphic recorder are arranged on the fixed bracket, the graphic recorder is located on one side of the path of the laser emitter emitting laser light, and the path of the laser emitter emitting laser light is adjusted to coincide with the reference line of the graphic recorder;

[0009] S2. The laser transmitter emits laser onto the road surface. The straight laser produces light and shadow changes on the road surface. The graphic recorder records the light and shadow changes of the laser on the road surface as multiple graphics above and below the baseline. The software calculates the sum of the areas of the multiple graphics to get the deformation. The larger the deformation, the worse the flatness of the road.

[0010] In one embodiment, the method for evaluating the road surface flatness by using the light illumination curve area method further includes steps S3 and S4, as follows:

[0011] S3, obtaining the position coordinates for measuring the road flatness through a satellite positioning system, and after measuring and obtaining the road deformation, associating the road deformation with the corresponding position coordinates;

[0012] S4. Move along the road to change the measuring position, repeat steps S2 and S3, and obtain the flatness data of the entire road.

[0013] In one of the embodiments, in step S1, a fixed bracket is set up on the work vehicle to install relevant instruments, so as to facilitate movement along the road and detection at different positions of the road.

[0014] In one embodiment, the fixed bracket includes a fixed section, a recorder mounting section and a transmitter mounting section, the fixed section is arranged on the vehicle, one end of the recorder mounting section is connected to one end of the fixed section, the other end of the recorder mounting section is connected to the graphic recorder, one end of the transmitter mounting section is connected to the other end of the fixed section, and the other end of the transmitter mounting section is connected to the laser transmitter.

[0015] In one of the embodiments, in step S2, under night conditions, a laser transmitter emits laser light toward the road surface, and a graphic recorder records a plurality of graphics formed by light and shadow changes above and below the baseline.

[0016] In one embodiment, in step S2, when measuring the longitudinal flatness of the road, the laser transmitter emits laser light along the longitudinal direction of the road, such as Figure 1 ; When measuring the lateral flatness of a road, the laser transmitter emits laser light in the lateral direction of the road, such as Figure 2 .

[0017] In summary, the present invention has the following beneficial effects:

[0018] The present invention evaluates the severity of road damage based on the size of the area generated by the laser ray contouring when the road loses its flatness, and the test operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of measuring the longitudinal flatness of a road according to the present invention;

[0020] Figure 2 It is a schematic diagram of measuring the transverse flatness of a road according to the present invention;

[0021] Figure 3 It is a schematic diagram of the measurement principle of the present invention;

[0022] Figure 4 This is a diagram showing how light and shadow will deform according to the shape of the object's surface. Figure 1 ;

[0023] Figure 5 This is a diagram showing how light and shadow will deform according to the shape of the object's surface. Figure 2 ;

[0024] Figure 6 This is a diagram showing how light and shadow will deform according to the shape of the object's surface. Figure 3 .

[0025] In the figure: 1. laser transmitter, 2. graphic recorder, 3. fixing bracket. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] It is worth noting that the directional words such as "upper" and "lower" involved in this article are all relative to the viewing angle of the drawings and are only for the convenience of description and cannot be understood as limitations on the technical solution.

[0028] The present invention has noticed that when a linear light shines on the surface of an object, it is completely attached to the surface of the object. At this time, if observed from the side, the light will show the shape of the surface of the object, such as Figures 4 to 6 If the road surface is rough, the laser beam will cause the light to fluctuate with the shape of the road surface, and the shape of the road surface can be observed from the side.

[0029] like Figure 4 As shown in the figure, light and shadow pass through the stairs, and the angle between the step and the wall will appear as the corner turns. The angle of light and shadow is just like the angle of the stairs. Figure 5 As shown in the figure, the light and shadow are reflected on the wall and the ground. When it hits the wall, it is straight, and when it hits the ground, it is flat. The light and shadow change with the corner of the house wall. Figure 6 As shown, the more concave and convex corners there are, the greater the accumulated value of the area enclosed between the concave and convex surface and the reference line.

[0030] Based on this, the present invention proposes a method for evaluating the flatness of a road surface using a light irradiation curve area method, comprising the following steps:

[0031] S1. Set up a fixed bracket 3 on the work vehicle, on which a laser emitter 1 and a graphic recorder 2 are arranged. The graphic recorder 2 is located on one side of the path of the laser emitted by the laser emitter 1. Adjust the path of the laser emitted by the laser emitter 1 to coincide with the baseline of the graphic recorder 2.

[0032] In step S1, various instruments are mounted on a work vehicle to facilitate movement along the road and to detect different locations on the road.

[0033] The fixed bracket 3 includes a fixed section, a recorder installation section and a transmitter installation section. Figure 1 and 2 As shown, the fixed section is set on the work vehicle, one end of the recorder installation section is connected to one end of the fixed section, the other end of the recorder installation section is connected to the graphic recorder 2, one end of the transmitter installation section is connected to the other end of the fixed section, and the other end of the transmitter installation section is connected to the laser transmitter 1.

[0034] S2. The laser transmitter 1 emits laser onto the road surface. The straight laser produces light and shadow changes on the road surface. The graphic recorder 2 records the light and shadow changes of the laser on the road surface as multiple graphics enclosed above and below the baseline. The software calculates the sum of the areas of the multiple graphics to obtain the deformation. The larger the deformation, the worse the flatness of the road.

[0035] like Figure 3 As shown in the figure, the areas of the multiple figures enclosed by the light and shadow changes of the laser on the road surface above and below the baseline are A and 1 , A 2 , A 3 , A 4 and A 5 Etc., according to the formula The deformation of the measured section of road can be obtained by calculation, and thus its flatness can be known.

[0036] It is easy to understand that the graphic recorder 2 is an existing camera device, and the image it captures contains a baseline, such as a conventional driving recorder. In the picture obtained by the graphic recorder 2, the graphics enclosed above and below the baseline are identified by software and the sum of the areas of multiple graphics is calculated. The originally flat road has potholes, ruts, bumps and settlements as the road is gradually damaged during use. The road surface has been deformed relative to the original surface. The greater the deformation, the larger the area enclosed by the deformed contour and the original road surface, and the worse the road flatness.

[0037] In step S2, in the dark, the laser transmitter 1 emits laser light to the road surface, and the graphic recorder 2 records a plurality of graphics formed by the light and shadow changes above and below the baseline.

[0038] In step S2, when measuring the longitudinal flatness of the road, Figure 1 As shown, the laser transmitter 1 emits laser along the longitudinal direction of the road; when measuring the transverse flatness of the road, as shown in FIG. Figure 2 As shown, the laser transmitter 1 transmits laser light in the transverse direction of the road.

[0039] The present invention also includes steps S3 and S4, as follows:

[0040] S3, obtaining the position coordinates for measuring the road flatness through a satellite positioning system, and after measuring and obtaining the road deformation, associating the road deformation with the corresponding position coordinates;

[0041] S4. Move along the road and change the measurement position, repeat steps S2 and S3, and obtain the roughness data of the entire road. The result of the roughness measurement can be combined with the international roughness index conversion. The International Roughness Index (IRI) is the first profile index with a very wide range of analysis methods. Its definition and properties are the same as those of the real profile, so it can be used for any real profile measurement. In this way, the measurement results can become internationally recognized test evaluation data.

[0042] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for evaluating road surface flatness using a light irradiation curve area method, characterized in that: The following steps are involved: S1. A fixed support (3) is set up on the work vehicle, a laser emitter (1) and a graphic recorder (2) are arranged on the fixed support (3), the graphic recorder (2) is located on one side of the path of the laser emitted by the laser emitter (1), and the path of the laser emitted by the laser emitter (1) is adjusted to coincide with the reference line of the graphic recorder (2); S2. The laser transmitter (1) emits laser light onto the road surface. The straight laser light produces light and shadow changes on the road surface. The graphic recorder (2) records the light and shadow changes on the road surface as multiple graphics formed above and below the baseline. The software calculates the sum of the areas of the multiple graphics to obtain the deformation amount. The larger the deformation amount, the worse the flatness of the road.

2. The method for evaluating road surface flatness by light irradiation curve area method as claimed in claim 1, characterized in that: It also includes steps S3 and S4, as follows: S3, obtaining the position coordinates for measuring the road flatness through a satellite positioning system, and after measuring and obtaining the road deformation, associating the road deformation with the corresponding position coordinates; S4. Move along the road to change the measuring position, repeat steps S2 and S3, and obtain the flatness data of the entire road.

3. The method for evaluating road surface flatness by light irradiation curve area method as claimed in claim 1, characterized in that: In step S1, relevant instruments are set up on a work vehicle to facilitate movement along the road and detection at different locations on the road.

4. The method for evaluating road surface flatness by light irradiation curve area method as claimed in claim 3, characterized in that: The fixed bracket (3) comprises a fixed section, a recorder installation section and a transmitter installation section, the fixed section is arranged on the vehicle, one end of the recorder installation section is connected to one end of the fixed section, the other end of the recorder installation section is connected to the graphic recorder (2), one end of the transmitter installation section is connected to the other end of the fixed section, and the other end of the transmitter installation section is connected to the laser transmitter (1).

5. The method for evaluating road surface flatness by light irradiation curve area method as claimed in claim 1, characterized in that: In step S2, under the condition of night, the laser transmitter (1) emits laser light to the road surface, and the image recorder (2) records a plurality of images formed by the changes of light and shadow above and below the baseline.

6. The method for evaluating road surface flatness by light irradiation curve area method as claimed in claim 1, characterized in that: In step S2, when measuring the longitudinal flatness of the road, the laser transmitter (1) transmits laser light in the longitudinal direction of the road; when measuring the transverse flatness of the road, the laser transmitter (1) transmits laser light in the transverse direction of the road.

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