Flatness measuring device for highway asphalt pavement maintenance

Abstract

The invention relates to the technical field of pavement flatness detection, and discloses a flatness measuring device for highway asphalt pavement maintenance, which comprises a frame body, the angle deviation assembly is used for displaying the gradient of the road surface; the measuring assembly is used for carrying out depression measurement and marking on the road surface; the measuring assembly comprises a measuring marking assembly and an inclined marking assembly. According to the flatness measuring device for road asphalt pavement maintenance, through the arranged measuring assembly, double measurement of the depression and the gradient of a road asphalt pavement can be achieved, the depression and the gradient of the road asphalt pavement can be automatically marked, and then the pavement is maintained according to the marked position, so that the overall pavement measuring efficiency is improved; a road section diagram does not need to be made, observation by naked eyes is not needed, mobile detection of equipment is directly utilized, marking is carried out, measurement of measurement personnel is facilitated, and observation and maintenance of subsequent maintenance personnel are also facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of road surface smoothness detection, in particular to a smoothness measuring device for highway asphalt road surface maintenance. 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 the vehicle. 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] During the maintenance of highway asphalt pavement, it is also necessary to detect the flatness of the road surface. The commonly used method for detection is the three-meter ruler test method, which requires manual measurement or naked eye observation of vehicle driving to record which sections of the road have potholes and which places have road inclinations, and then record them again to achieve overall measurement and record of the road section. However, this method is too traditional and has low detection efficiency. If it relies on manual visual observation, it is easy to make mistakes in data judgment, resulting in large errors in measurement results. Therefore, a flatness measuring device for highway asphalt pavement maintenance is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention provides a device for measuring the flatness of a highway asphalt pavement for maintenance, which solves the problems of low efficiency, large measurement data errors and inconvenient measurement in the prior art.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flatness measuring device for highway asphalt pavement maintenance, comprising a frame; an angular deviation component for displaying the inclination of the road surface; a measuring component for measuring and marking the depression of the road surface; the measuring component comprises a measuring mark component and an inclination mark component; the measuring mark component is used to measure and mark the depression of the road surface; the inclination mark component is used to mark and measure the inclination of the road surface; when the frame moves, it will drive the measuring component to perform rolling detection of depression and inclination on the road surface.

[0008] Preferably, the frame body includes a frame, a push rod is installed on the frame, a roller is rotatably connected to the frame, an upper frame is fixedly connected to the frame, a positioning plate is fixedly connected to the frame, and two moving wheels are installed at the bottom of the frame.

[0009] Preferably, the angular deviation assembly includes a display disk, which is fixed on an upper frame and provided with scale lines. A pointer is rotatably connected to the center position of the display disk, and the pointer is fixedly connected to a rotating shaft via a connecting rod, and a pendulum is provided at the bottom of the rotating shaft.

[0010] Preferably, the measurement marking assembly includes a material box, the material box is mounted on the upper frame, an opening is provided on the material box, white powder for marking the road surface is provided in the material box, and a recessed marking device is provided at the bottom of the material box.

[0011] Preferably, the interior of the material box is rotatably connected to a rotating shaft, a plurality of blades are mounted on the rotating shaft, one end of the rotating shaft is fixedly connected to pulley 2, the surface of pulley 2 is connected to pulley 1 via a toothed belt drive, and pulley 1 is mounted on a roller.

[0012] Preferably, the recessed marking device includes a connecting tube, the top of the connecting tube is connected to the material box, the bottom of the connecting tube is slidably connected to a sliding tube, the bottom of the sliding tube is connected to a cylinder, the bottom of the cylinder is rotatably connected to a sliding wheel, a V-shaped frame is installed inside the cylinder, and discharge ports are opened on both sides of the cylinder.

[0013] Preferably, a bracket is fixedly connected to the surface of the sliding tube, a compression spring is connected to the bottom of the bracket, the bottom of the compression spring is fixedly connected to the positioning plate, a sliding pin is fixedly connected to the top of the bracket, and the upper and lower positions of the connecting tube are slidingly connected to an upper plate and a lower plate respectively, circular holes are provided on the upper plate and the lower plate, a moving frame is fixedly connected to one side of the upper plate and the lower plate, an inclined groove is provided on the moving frame, and the sliding pin is slidably connected to the inside of the inclined groove.

[0014] Preferably, the tilt mark assembly includes a transverse frame, which is slidably connected to the material box, the bottom of the material box is connected to a square tube, the top of the square tube abuts against the bottom of the transverse frame, the left end of the transverse frame is fixedly connected to a baffle, a rocker arm is provided on one side of the baffle, and one end of the rocker arm is fixedly connected to the rotating shaft.

[0015] Preferably, one side of the baffle is connected with a sliding shaft, the sliding shaft is slidably connected to the display panel, and a telescopic spring is arranged on the sliding shaft.

[0016] Preferably, a protective frame is provided on the frame body, and the protective frame is located on one side of the measuring component and is used to prevent gravel on the road surface from contacting the measuring component.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a device for measuring the flatness of a highway asphalt pavement for maintenance, which has the following beneficial effects:

[0019] 1. The flatness measuring device for highway asphalt pavement maintenance can realize dual measurement of depression and inclination of highway asphalt pavement through the set measuring components, and automatically mark the depressed and inclined pavement. After that, highway maintenance personnel can directly check on the road section according to the marked position and lines, and then carry out pavement maintenance according to the marked position, thereby improving the overall pavement measurement efficiency. There is no need to make a road section map or rely on naked eye observation. The mobile detection of the equipment is directly used and marking is carried out, which is convenient for the measurement of the surveying personnel and the observation and maintenance of the subsequent maintenance personnel.

[0020] 2. The flatness measuring device for highway asphalt pavement maintenance has basically very accurate measurement values ​​throughout the entire process. It uses the depth of the depression and the angle of inclination to automatically mark and measure the marking points, and uses the automatic center of gravity offset to realize the inclination check of the road surface, so that the inclination of the road surface will be marked as a line, thereby achieving accurate measurement and accurate marking at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall front schematic diagram of a device for measuring the smoothness of a highway asphalt pavement maintenance proposed by the present invention;

[0022] Figure 2 This is an overall side schematic diagram of a device for measuring the flatness of a highway asphalt pavement maintenance proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the frame structure of a device for measuring the flatness of a highway asphalt pavement maintenance proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of an angular deviation component of a flatness measuring device for highway asphalt pavement maintenance proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a measuring mark component of a flatness measuring device for highway asphalt pavement maintenance proposed by the present invention;

[0026] Figure 6 This is a schematic structural diagram of a depression marking device of a flatness measuring device for highway asphalt pavement maintenance proposed by the present invention;

[0027] Figure 7 This is a schematic structural diagram of a tilt marking assembly of a flatness measuring device for highway asphalt pavement maintenance proposed by the present invention.

[0028] In the figure: 1, frame; 101, push rod; 102, upper frame; 103, roller; 104, positioning plate; 2, protection frame; 3, angle deviation assembly; 301, display panel; 302, pointer; 303, rotating shaft; 304, pendulum; 4, measurement mark assembly; 401, material box; 402, pulley 1; 403, rotating shaft; 404, blade; 405, pulley 2; 406, recessed mark device; 4061, connecting pipe; 4062, shift Moving frame; 4063, upper plate; 4064, lower plate; 4065, round hole; 4066, sliding tube; 4067, bracket; 4068, sliding pin; 4069, compression spring; 4070, cylinder; 4071, V-shaped frame; 4072, discharge port; 4073, sliding wheel; 5, tilt mark assembly; 501, transverse frame; 502, square tube; 503, rocker arm; 504, sliding shaft; 505, telescopic spring; 506, baffle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7 A flatness measuring device for highway asphalt pavement maintenance includes a frame 1; an angular deviation component 3, which is used to display the inclination of the road surface; a measuring component, which is used to measure and mark the depression of the road surface; the measuring component includes a measuring mark component 4 and an inclination mark component 5; the measuring mark component 4 is used to measure and mark the depression of the road surface; the inclination mark component 5 is used to mark the inclination of the road surface. When the measuring frame 1 moves, it will drive the measuring component to perform depression and inclination rolling detection on the road surface.

[0031] In this embodiment, the frame 1 includes a frame, a push rod 101 is installed on the frame, a roller 103 is rotatably connected to the frame, an upper frame 102 is fixedly connected to the frame, a positioning plate 104 is fixedly connected to the frame, and two moving wheels are installed at the bottom of the frame. In order to prevent the entire device from being stuck in the depression due to excessive depression, the roller 103 is set. Because the roller 103 is long enough and basically laid flat on the road surface, the partial depression does not affect the movement of the roller 103, so the main movement of the entire device still depends on the rolling of the roller 103.

[0032] Furthermore, the angle deviation assembly 3 includes a display disk 301, which is fixed on the upper frame 102, and is provided with scale lines. The center of the display disk 301 is rotatably connected to a pointer 302, and the pointer 302 is fixedly connected to a rotating shaft 303 through a connecting rod, and a pendulum 304 is provided at the bottom of the rotating shaft 303. When the road surface is tilted, the pointer 302 will rotate under the gravity of the pendulum 304, because the gravity of the pendulum 304 is always vertically downward. At this time, the pointer 302 will point to the display disk 301 at different scales, and the surveyor can directly check the tilt angle of the road surface at this time, which is more convenient.

[0033] Furthermore, the measurement mark assembly 4 includes a material box 401, which is mounted on the upper frame 102, and is provided with an opening. White powder for marking the road surface is provided in the material box 401, and a recessed marking device 406 is provided at the bottom of the material box 401. The interior of the material box 401 is rotatably connected to a rotating shaft 403, on which a plurality of blades 404 are mounted, and one end of the rotating shaft 403 is fixedly connected to a pulley 2 405, and the surface of the pulley 2 405 is connected to a pulley 1 402 through a toothed belt transmission, and the pulley 1 402 is mounted on the roller 103. In order to prevent the accumulation of white powder inside the material box 401, a blade 404 is provided. When the roller 103 rolls, it drives the rotation of pulley 1 402, and utilizes the transmission connection of the toothed belt to drive the rotation of pulley 2 405, thereby driving the rotation shaft 403 connected thereto, and finally driving the rotation of the blade 404, thereby stirring the white powder inside the material box 401 and keeping it in motion at all times, so as to facilitate the white powder to continuously enter the interior of the connecting pipe 4061.

[0034] In addition, the recessed marking device 406 includes a connecting tube 4061, the top of the connecting tube 4061 is connected to the material box 401, the bottom of the connecting tube 4061 is slidably connected to a sliding tube 4066, the bottom of the sliding tube 4066 is connected to a cylinder 4070, the bottom of the cylinder 4070 is rotatably connected to a sliding wheel 4073, a V-shaped frame 4071 is installed inside the cylinder 4070, and discharge ports 4072 are opened on both sides of the cylinder 4070. The surface of the sliding tube 4066 is fixedly connected with a bracket 4067, the bottom of the bracket 4067 is connected with a compression spring 4069, the bottom of the compression spring 4069 is fixedly connected to the positioning plate 104, the top of the bracket 4067 is fixedly connected with a sliding pin 4068, the upper and lower positions of the connecting tube 4061 are respectively slidably connected with an upper plate 4063 and a lower plate 4064, both of which are provided with circular holes 4065, and one side of the upper plate 4063 and the lower plate 4064 is fixedly connected with a moving frame 4062, and the moving frame 4062 is provided with an inclined groove, and the sliding pin 4068 is slidably connected inside the inclined groove. When a depression appears on the road surface, first, the cylinder 4070 will sink into the depressed position and move down a certain distance, and then drive the sliding tube 4066 to move down. The downward movement of the sliding tube 4066 will synchronously drive the sliding pin 4068 on the bracket 4067 to move down, and the sliding of the inclined groove and the sliding pin 4068 will drive the horizontal movement of the mobile frame 4062. When the mobile frame 4062 slides to the left, it will drive the synchronous left movement of the upper plate 4063 and the lower plate 4064. In the initial stage, the circular hole 4065 on the upper plate 4063 is in a connected state with the material box 401 through the connecting pipe 4061, so the internal mark is white. The powder will enter the inside of the connecting pipe 4061 through the pipeline and be carried on the top of the lower plate 4064. When the depression moves horizontally, the upper plate 4063 will appear to horizontally cut off the connecting pipe 4061 and intercept the white powder, and the round hole 4065 on the lower plate 4064 will enter the inside of the connecting pipe 4061. At this time, the white powder inside will flow along the round hole 4065 of the lower plate 4064 into the inside of the cylinder 4070, and flow out from the discharge ports 4072 on both sides through the setting of the V-shaped frame 4071, thereby directly marking the depression position of the road surface automatically, and the white powder will flow into the depression position. Therefore, the overall convenient measurement and automatic marking of asphalt roads are realized.

[0035] In addition, the tilt mark assembly 5 includes a transverse frame 501, which is slidably connected to the material box 401. The bottom of the material box 401 is connected to a square tube 502, and the top of the square tube 502 abuts against the bottom of the transverse frame 501. The left end of the transverse frame 501 is fixedly connected to a baffle 506, and a rocker arm 503 is provided on one side of the baffle 506, and one end of the rocker arm 503 is fixedly connected to the rotating shaft 303. When the road surface is in an inclined state, the main body of the equipment will tilt as a whole, and at this time, the pointer 302 will rotate due to the center of gravity of the pendulum 304. Because the center of gravity of the pendulum 304 is always vertically downward, the equipment will tilt, and the rocker arm 503 on the rotating shaft 303 will abut against the baffle 506 to realize low-pressure gravity movement of the entire transverse frame 501, thereby driving the transverse frame 501 to move laterally, and then the bottom of the transverse frame 501 will be separated from the port position of the square tube 502. At this time, the white powder inside the material box 401 will also fall from the bottom of the square tube 502, so the overall linear marking of the white powder will be realized as the frame 1 moves.

[0036] It is worth noting that a sliding shaft 504 is connected to one side of the baffle 506, and the sliding shaft 504 is slidably connected to the display panel 301, and a telescopic spring 505 is provided on the sliding shaft 504. Through the telescopic spring 505, when the device is straightened after tilting, the elastic force of the telescopic spring 505 will push the transverse frame 501 to reset, thereby automatically re-blocking the position of the square tube 502, so that the tilt mark is automatically closed.

[0037] It is worth noting that a protective frame 2 is provided on the frame 1, and the protective frame 2 is located on one side of the measuring component to prevent gravel on the road from contacting the measuring component. The protective frame 2 can block and push away some gravel in front of the device to prevent the gravel from contacting the measuring component and causing false triggering of marking and measurement.

[0038] Working principle: first, when the flatness test is carried out on the road surface, the whole device is moved to the road surface to be tested, and then the whole device is driven to move on the asphalt road to be tested by manual pushing or electric control of the movement of the frame 1, and two moving wheels and a roller 103 are used for rolling movement. When the road surface is concave, the cylinder 4070 will first sink to the concave position and move down a certain distance, and then drive the sliding tube 4066 to move down, and the downward movement of the sliding tube 4066 will synchronously drive the sliding pin 4068 on the bracket 4067 to move down, and the sliding of the inclined groove and the sliding pin 4068 will drive the lateral movement of the moving frame 4062, and when the moving frame 4062 slides to the left, it will drive the synchronous left movement of the upper plate 4063 and the lower plate 4064 In the initial stage, the circular hole 4065 on the upper plate 4063 is connected with the material box 401 through the connecting pipe 4061, so the internal marking white powder will enter the interior of the connecting pipe 4061 through the pipeline and be carried on the top of the lower plate 4064. When the depression moves horizontally, the upper plate 4063 will horizontally cut off the connecting pipe 4061 to intercept the white powder, and the circular hole 4065 on the lower plate 4064 will enter the interior of the connecting pipe 4061. At this time, the internal white powder will flow along the circular hole 4065 of the lower plate 4064 into the interior of the cylinder 4070, and flow out from the discharge ports 4072 on both sides through the V-shaped frame 4071, thereby directly marking the depressed position of the road surface automatically, and the white powder will flow into the depressed position. The whole device is provided with several groups of depression marking devices 406, which directly form a whole row of independent detection. As long as there is a depression or unevenness at a certain position on the road surface, the mark after measurement will be realized, and the measurement is directly measured according to the depth of each sliding tube 4066 moving down. The compression spring 4069 is provided to provide a certain tensile force, so that the sliding tube 4066 has a downward force all the time. As long as there is a certain depression, it will follow the gravity and the compression spring 4069 to realize the downward movement of the cylinder 4070 for measurement and marking. The sliding wheel 4073 is provided to facilitate the rolling of the cylinder 4070 on the road surface. In order to prevent the device from being stuck in the depression due to excessive depression, the roller 103 is provided. Because the roller 103 is long enough and basically laid flat on the road surface, the partial depression does not affect the movement of the roller 103, so the main movement of the whole device still depends on the rolling of the roller 103. In order to prevent the accumulation of white powder inside the material box 401, a blade 404 is provided. When the roller 103 rolls, it drives the rotation of pulley 1 402, and utilizes the transmission connection of the toothed belt to drive the rotation of pulley 2 405, thereby driving the rotation shaft 403 connected thereto, and finally driving the rotation of the blade 404, thereby stirring the white powder inside the material box 401 and keeping it in motion at all times, so as to facilitate the white powder to continuously enter the interior of the connecting pipe 4061.When the road surface is in an inclined state, because the roller 103 is always in contact with the ground, the main body of the equipment will tilt as a whole, and at this time, the pointer 302 will rotate under the action of the center of gravity of the pendulum 304. Because the center of gravity of the pendulum 304 is always vertically downward, when the equipment is tilted, the rocker 503 on the rotating shaft 303 and the baffle 506 will abut against each other, thereby realizing the low-pressure gravity movement of the entire transverse frame 501, thereby driving the transverse frame 501 to move laterally, and then the bottom of the transverse frame 501 will be separated from the port position of the square tube 502. At this time, the white powder inside the material box 401 will also slide and spill from the bottom of the square tube 502, so the whole will realize the linear marking of the white powder with the movement of the frame 1, and at this time, the pointer 302 will point to the display panel 301 under different scales, and the measurement personnel can directly check the inclination angle of the road surface at this time, which is more convenient. The tilt mark assembly 5 is provided with two groups, and the left-right tilt measurement and marking of the tilted road surface can be directly realized in a left-right symmetrical manner. Subsequent maintenance personnel can follow the moving route of the equipment and directly check the markings on the road surface for maintenance and repair.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A flatness measuring device for highway asphalt pavement maintenance, characterized in that: include Frame (1); An angular deviation component (3), used for displaying the inclination of the road surface; A measuring component for measuring and marking depressions in the road surface; The measuring component comprises a measuring mark component (4) and a tilt mark component (5); The measuring marking assembly (4) is used to measure and mark depressions on a road surface; The inclination marking assembly (5) is used to mark and measure the inclination of a road surface; When the frame (1) moves, it will drive the measuring component to perform depression and inclination rolling detection on the road surface.

2. A device for measuring the flatness of a highway asphalt pavement according to claim 1, characterized in that: The frame body (1) comprises a frame, a push rod (101) is installed on the frame, a roller (103) is rotatably connected to the frame, an upper frame (102) is fixedly connected to the frame, a positioning plate (104) is fixedly connected to the frame, and two moving wheels are installed at the bottom of the frame.

3. A device for measuring the flatness of a highway asphalt pavement according to claim 2, characterized in that: The angle deflection assembly (3) comprises a display disk (301), the display disk (301) is fixed on the upper frame (102), scale lines are arranged on the display disk (301), a pointer (302) is rotatably connected to the center position of the display disk (301), the pointer (302) is fixedly connected to a rotating shaft (303) via a connecting rod, and a pendulum (304) is arranged at the bottom of the rotating shaft (303).

4. A device for measuring the flatness of a highway asphalt pavement according to claim 3, characterized in that: The measurement marking assembly (4) comprises a material box (401), the material box (401) is mounted on an upper frame (102), an opening is provided on the material box (401), white powder for marking the road surface is provided in the material box (401), and a recessed marking device (406) is provided at the bottom of the material box (401).

5. A device for measuring the flatness of a highway asphalt pavement according to claim 4, characterized in that: The material box (401) is internally rotatably connected to a rotating shaft (403), and a plurality of blades (404) are mounted on the rotating shaft (403). One end of the rotating shaft (403) is fixedly connected to a second pulley (405), and the surface of the second pulley (405) is connected to a first pulley (402) via a toothed belt transmission, and the first pulley (402) is mounted on a roller (103).

6. A device for measuring the flatness of a highway asphalt pavement for maintenance according to claim 5, characterized in that: The recessed marking device (406) comprises a connecting tube (4061), the top of which is connected to the material box (401), the bottom of which is slidably connected to a sliding tube (4066), the bottom of which is connected to a cylinder (4070), the bottom of which is rotatably connected to a sliding wheel (4073), a V-shaped frame (4071) is installed inside the cylinder (4070), and discharge ports (4072) are provided on both sides of the cylinder (4070).

7. A device for measuring the flatness of a highway asphalt pavement according to claim 6, characterized in that: The surface of the sliding tube (4066) is fixedly connected with a bracket (4067), the bottom of the bracket (4067) is connected with a compression spring (4069), the bottom of the compression spring (4069) is fixedly connected to the positioning plate (104), the top of the bracket (4067) is fixedly connected with a sliding pin (4068), the upper and lower positions of the connecting tube (4061) are slidably connected with an upper plate (4063) and a lower plate (4064), the upper plate (4063) and the lower plate (4064) are both provided with a circular hole (4065), one side of the upper plate (4063) and the lower plate (4064) is fixedly connected with a moving frame (4062), the moving frame (4062) is provided with an inclined groove, and the sliding pin (4068) is slidably connected inside the inclined groove.

8. The device for measuring the flatness of a highway asphalt pavement according to claim 7, characterized in that: The tilt mark assembly (5) comprises a transverse frame (501), the transverse frame (501) is slidably connected to the material box (401), the bottom of the material box (401) is connected to a square tube (502), the top of the square tube (502) is in contact with the bottom of the transverse frame (501), the left end of the transverse frame (501) is fixedly connected to a baffle (506), a rocker arm (503) is provided on one side of the baffle arm (506), and one end of the rocker arm (503) is fixedly connected to the rotating shaft (303).

9. A device for measuring the flatness of a highway asphalt pavement for maintenance according to claim 8, characterized in that: One side of the baffle (506) is connected to a sliding shaft (504), the sliding shaft (504) is slidably connected to the display panel (301), and a telescopic spring (505) is arranged on the sliding shaft (504).

10. The device for measuring the flatness of a highway asphalt pavement according to claim 1, characterized in that: A protective frame (2) is provided on the frame body (1); the protective frame (2) is located on one side of the measuring component and is used to prevent gravel on the road surface from contacting the measuring component.

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