CN112880626A - Measuring device for detecting road surface flatness - Google Patents
Measuring device for detecting road surface flatness Download PDFInfo
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- CN112880626A CN112880626A CN202110286772.6A CN202110286772A CN112880626A CN 112880626 A CN112880626 A CN 112880626A CN 202110286772 A CN202110286772 A CN 202110286772A CN 112880626 A CN112880626 A CN 112880626A
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/30—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces
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Abstract
The invention belongs to the technical field of road flatness detection, and discloses a measuring device for detecting the road surface flatness, which comprises a supporting assembly, wherein a plurality of measuring assemblies distributed in a straight shape are inserted in the supporting assembly, the plurality of measuring assemblies distributed in a straight shape are limited by a limiting assembly, the limiting assembly is positioned by a positioning assembly, the supporting assembly comprises an inverted U-shaped frame, rollers are fixedly arranged at the bottom end of the inverted U-shaped frame, a plurality of jacks distributed in a straight shape are arranged on the inner top surface of the inverted U-shaped frame, a plurality of circular placing grooves matched with the jacks are arranged on the upper surface of the inverted U-shaped frame, a connecting plate is fixedly arranged on one side surface of the inverted U-shaped frame, a vertical plate is fixedly arranged on the upper surface of the connecting plate, and an angle-adjustable display screen is arranged at the top end of the vertical plate. The invention greatly improves the measurement precision, is convenient to measure, reduces the labor intensity of measuring personnel and reduces the interference of adverse road conditions on the measurement.
Description
Technical Field
The invention belongs to the technical field of road flatness detection, and particularly relates to a measuring device for detecting the road surface flatness.
Background
For asphalt pavement, whether new asphalt pavement or old asphalt pavement, the flatness detection is needed according to relevant regulations and requirements.
At present, the existing measuring device for detecting the road surface evenness in the market has the defects of high labor intensity, low measuring precision and large error.
Disclosure of Invention
The invention aims to solve the problems, and provides a measuring device for detecting the road surface evenness, which has the advantages of convenience in measurement and high precision.
In order to achieve the purpose, the invention provides the following technical scheme: a measuring device for detecting the flatness of a road surface comprises a supporting component, wherein a plurality of measuring components which are distributed in a straight line shape are inserted into the supporting component, the plurality of measuring components which are distributed in the straight line shape are limited through a limiting component, and the limiting component is positioned through a positioning component;
the support assembly comprises an inverted U-shaped frame, rollers are fixedly mounted at the bottom end of the inverted U-shaped frame, a plurality of jacks distributed in a linear shape are formed in the inner top surface of the inverted U-shaped frame, a plurality of circular placement grooves matched with the jacks are formed in the upper surface of the inverted U-shaped frame, a connecting plate is fixedly mounted on one side surface of the inverted U-shaped frame, a vertical plate is fixedly mounted on the upper surface of the connecting plate, a display screen with an adjustable angle is arranged at the top end of the vertical plate, and a controller and a buzzer are fixedly mounted on the upper surface of the connecting plate;
the measuring assembly comprises a measuring sensor, the measuring sensor is inserted into the jack, a circular baffle is fixedly installed at the top end of the measuring sensor, and the circular baffle is located inside the circular placing groove;
the limiting assembly comprises a limiting plate, the lower surface of the limiting plate is in contact with the upper surface of the inverted U-shaped frame, a convex plate is fixedly mounted on one side face of the limiting plate, a positioning groove is formed in the lower surface of the convex plate, end plates are fixedly mounted at two ends of the limiting plate, the limiting assembly further comprises two groups of supports, the supports are fixedly mounted on one surface of the inverted U-shaped frame, a fixing column is fixedly mounted between the two supports, a sliding plate is connected onto the fixing column in a sliding mode, and a first spring is sleeved on the peripheral side face of the fixing column and is located between the sliding plate and one support close to the limiting plate;
the positioning assembly comprises a fixing plate, the fixing plate is fixedly arranged on one surface of the inverted U-shaped frame, a positioning column penetrates through the fixing plate, a lower pressing plate is fixedly arranged at the bottom end of the positioning column, a baffle ring is fixedly sleeved in the middle of the positioning column, and a second spring is sleeved on the peripheral side of the positioning column and positioned between the upper surface of the fixing plate and the lower surface of the baffle ring; an inclination angle sensor is arranged above the U-shaped frame and is connected with the controller; when the whole device is inclined, the inclination angle sensor measures the inclination angle of the device as alpha and transmits the alpha value to the controller, the distance between the rollers at the two sides is AB = L, the vertical distance CD = h1 between the measuring assembly and the connecting line between the rollers at the two sides, the distance BD = L1 between the measuring assembly and the roller at one side, when the inclination angle of the device measured by the inclination angle sensor is alpha, and the intersection point of the measuring line of the measuring assembly and the ground is E, DE = h3= AD tan alpha = (L-L1) tan alpha, namely, the measuring component measures the distance CE = h1+ h3= h1+ (L-L1) tan alpha from the flat road surface, the controller calculates the value of CE and takes the value of CE as a reference value for comparison, the device is used for providing a judgment standard when the road surface is judged to be convex or concave when the flatness of the road surface is continuously measured after the device is inclined, and calculating the convex height or concave depth of the road surface.
As a preferable technical scheme of the invention, the number of the rollers is four, and the four rollers are arranged in a rectangular shape.
As a preferable technical scheme of the invention, the central axes of the insertion holes and the circular placing groove are superposed, the inner diameter of the circular placing groove is larger than that of the insertion holes, and the difference is between 1 cm and 2 cm.
As a preferable technical scheme of the invention, the controller comprises a processor and a control unit, and the display screen, the buzzer and the measuring sensor are all connected with the processor.
As a preferable technical scheme of the invention, one end of the convex plate, which is far away from the limiting plate, is fixedly provided with a pull ring, and the pull ring is a component made of steel alloy.
As a preferable technical scheme of the invention, the slide plate is internally provided with a through hole matched with the fixed column, the diameter of the fixed column is the same as the inner diameter of the through hole on the slide plate, and the peripheral side surface of the fixed column and the inner wall of the through hole on the slide plate are smooth.
As a preferable technical scheme of the invention, the top end surface of the positioning column is an arc surface which is smooth.
As a preferable technical scheme of the invention, two side plates are fixedly arranged on the outer surface of the inverted U-shaped frame, and a limit bolt is in threaded connection with the inner part of each side plate.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the plurality of measuring sensors which are distributed in a straight line shape are arranged, the distance between every two adjacent measuring sensors is small, the road surface evenness can be accurately measured, the measuring result is transmitted to the display screen and is displayed by the display screen, and when the height difference of the road surface measured by the plurality of measuring sensors exceeds 0.5mm, the controller controls the buzzer to give an alarm to warn a measurer that the height difference is too large and the road surface is not flat; and through setting up multiunit parallel measuring transducer, can carry out the multi-thread measurement to the road surface simultaneously, improve measuring efficiency, convenient operation, measurement of efficiency height.
2. The inclination angle sensor is arranged and matched with the measuring component to work together, when the road surface flatness of the measured road is measured, when the road surface of the measured road has bulges or pits, rollers at two sides are not at the same horizontal height, and the whole device is inclined, the inclination angle sensor is matched with the controller to calculate a comparison reference value, when the value measured by the measuring component in real time is smaller than the comparison reference value, the situation that the road surface measured by the measuring component has bulges is indicated, and the bulge amount is obtained by subtracting the comparison reference value from the value measured by the measuring component in real time, so that an accurate value amount reference amount is provided for repairing the bulges on the road surface; when the measured value of the measuring component is greater than the reference value, indicating that the measured road surface has pits, and the depth of the pits is obtained by subtracting the reference value from the value measured by the measuring component in real time, so as to provide an accurate reference quantity of the numerical value for repairing the pits on the road surface; the inclination angle sensor of the device can measure the protrusion amount or the pit depth of the road surface in cooperation with the measuring component, provides accurate data guidance for further repairing the road, and improves the adaptability of the device to various road surface conditions during road surface flatness measurement.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a schematic structural view of a support assembly of the present invention;
FIG. 5 is a cross-sectional view of the support assembly of the present invention;
FIG. 6 is a schematic structural view of a stop assembly according to the present invention;
FIG. 7 is a schematic view of another embodiment of the spacing assembly of the present invention;
FIG. 8 is a schematic structural view of a positioning assembly of the present invention;
fig. 9 is a schematic view of the measurement of the present invention in a tilted position.
In the figure: 1. a support assembly; 101. an inverted U-shaped frame; 102. a roller; 103. a jack; 104. a circular placement groove; 105. a connecting plate; 106. a vertical plate; 107. a display screen; 108. a controller; 109. a buzzer; 2. a measurement assembly; 201. a measurement sensor; 202. a circular baffle; 3. a limiting component; 301. a limiting plate; 302. a convex plate; 303. positioning a groove; 304. a pull ring; 305. an end plate; 306. a support; 307. fixing a column; 308. a slide plate; 309. a first spring; 4. a positioning assembly; 401. a fixing plate; 402. a positioning column; 403. a lower pressing plate; 404. a baffle ring; 405. a second spring; 5. a side plate; 501. and a limiting bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 8, the invention provides a measuring device for detecting the flatness of a road surface, which comprises a supporting component 1, wherein a plurality of measuring components 2 distributed in a straight shape are inserted into the supporting component 1, the plurality of measuring components 2 distributed in the straight shape are limited by a limiting component 3, and the limiting component 3 is positioned by a positioning component 4; the supporting component 1 comprises an inverted U-shaped frame 101, rollers 102 are fixedly mounted at the bottom end of the inverted U-shaped frame 101, a plurality of jacks 103 distributed in a straight shape are formed in the inner top surface of the inverted U-shaped frame 101, a plurality of circular placing grooves 104 matched with the jacks 103 are formed in the upper surface of the inverted U-shaped frame 101, a connecting plate 105 is fixedly mounted on one side surface of the inverted U-shaped frame 101, a vertical plate 106 is fixedly mounted on the upper surface of the connecting plate 105, an angularly adjustable display screen 107 is arranged at the top end of the vertical plate 106, and a controller 108 and a buzzer 109 are further fixedly mounted on the upper surface of the connecting plate 105;
the measuring assembly 2 comprises a measuring sensor 201, and the sensor 201 can measure the distance data between the sensor 201 and the road surface and transmit the data to the controller; the measuring sensor 201 is inserted into the jack 103, a circular baffle 202 is fixedly installed at the top end of the measuring sensor 201, and the circular baffle 202 is located inside the circular placing groove 104;
the limiting assembly 3 comprises a limiting plate 301, the lower surface of the limiting plate 301 is in contact with the upper surface of the inverted U-shaped frame 101, a convex plate 302 is fixedly mounted on one side surface of the limiting plate 301, a locating groove 303 is formed in the lower surface of the convex plate 302, end plates 305 are fixedly mounted at two ends of the limiting plate 301, the limiting assembly 3 further comprises two groups of supporting seats 306, the supporting seats 306 are fixedly mounted on one surface of the inverted U-shaped frame 101, a fixed column 307 is fixedly mounted between the two supporting seats 306, a sliding plate 308 is connected onto the fixed column 307 in a sliding mode, and a first spring 309 is sleeved on the peripheral side surface of the fixed column 307 and between the sliding plate 308 and one supporting seat 306 close to the limiting plate 301;
the positioning assembly 4 includes a fixing plate 401, the fixing plate 401 is fixedly mounted on a surface of the inverted "U" shaped frame 101, a positioning column 402 penetrates through the fixing plate 401, a lower pressing plate 403 is fixedly mounted at the bottom end of the positioning column 402, a retaining ring 404 is fixedly sleeved at the middle part of the positioning column 402, and a second spring 405 is sleeved on the circumferential side of the positioning column 402 and located between the upper surface of the fixing plate 401 and the lower surface of the retaining ring 404.
The number of the rollers 102 is four, the four rollers 102 are arranged in a rectangular shape, and the rollers 102 are arranged, so that the flexibility of the measuring device for detecting the road surface evenness can be improved, and the measuring device is convenient to move.
The central axes of the jack 103 and the circular placement groove 104 are coincident, the inner diameter of the circular placement groove 104 is larger than that of the jack 103, the difference value is 1-2cm, the jack 103 is arranged, the measuring sensor 201 can be vertically inserted into the jack 103, and the height of the road surface is measured through the measuring sensor 201.
Wherein, controller 108 includes treater and the control unit, and display screen 107, bee calling organ 109 and measuring sensor 201 all are connected with the treater, and measuring sensor 201 measures on the height of road surface will transmit display screen 107, shows through display screen 107, and when the difference in height on a plurality of measuring sensor 201 measured road surface exceeded 0.5mm, then controller 108 will control bee calling organ 109 and report to the police, and the warning survey crew difference in height is too big, the road surface unevenness.
Wherein, a pull ring 304 is fixedly installed at one end of the convex plate 302 away from the limit plate 301, and the pull ring 304 is a steel alloy component.
A through hole matched with the fixing column 307 is formed in the sliding plate 308, the diameter of the fixing column 307 is the same as the inner diameter of the through hole in the sliding plate 308, and the peripheral side face of the fixing column 307 and the inner wall of the through hole in the sliding plate 308 are smooth.
Wherein, the top terminal surface of reference column 402 is the cambered surface, and the cambered surface is smooth, sets up the top of reference column 402 into smooth cambered surface, can reduce the top of reference column 402 and the friction of flange 302 lower surface.
Two side plates 5 are fixedly arranged on the outer surface of the inverted U-shaped frame 101, a limiting bolt 501 is in threaded connection with the inner part of each side plate 5, and the side plates 5 and the limiting bolts 501 are matched for use, so that the automobile chassis can be braked, and the phenomenon that the automobile chassis moves during measurement is avoided.
When the road flatness needs to be measured, firstly, a measurer pushes the measuring device to a proper position through the rollers 102 to enable the rollers 102 on two sides to be at the same horizontal height, then the limiting bolt 501 is screwed to enable the bottom end of the limiting bolt 501 to be in contact with the ground, so that the measuring device is braked, then, the measurer pulls the pull ring 304 to enable the first spring 309 to contract and shorten, meanwhile, the limiting plate 301 moves towards the pull ring 304 until the top end of the positioning column 402 is inserted into the positioning groove 303, at the moment, the insertion hole 103 and the circular placing groove 104 are exposed, then, the measurer inserts the measuring sensor 201 with the circular baffle 202 into the insertion hole 103, then, the measurer presses the pressing plate downwards again, at the moment, the second spring 405 contracts and shortens, the top end of the positioning column 402 is separated from the inside of the positioning groove 303, at the moment, due to the elastic force of the first spring 309, limiting plate 301 covers circular baffle 202 to it is spacing to carry out measuring set 2, later measuring sensor 201 measures the roughness on road surface, measuring sensor 201 measures on the height that the road surface will be transmitted display screen 107, show through display screen 107, measure the difference in height on road surface when a plurality of measuring sensor 201, controller 108 will control buzzer 109 and report to the police so, and the warning survey crew difference in height is too big, the road surface unevenness.
Example 2
When using this device to measure road surface roughness, discover, there is arch or pit in the road surface of measurand road, when leading to the gyro wheel 102 of both sides not at same level, can lead to whole device to take place the slope, and then makes the data of measuring assembly 2 measuring road surface roughness to have the error. The device is further improved in order to further adapt the device to various road surface conditions and avoid the distortion of the measuring result caused by the inclination of the device due to the bulge or the depression of the measured road surface.
An inclination angle sensor is arranged above the U-shaped frame 101 and connected with a controller 108, when a road surface is raised or concave and uneven, the rollers 102 on two sides cannot be supported at the same horizontal height, when the whole device inclines, the inclination angle of the device measured by the inclination angle sensor is alpha, alpha value is transmitted into the controller, the inclination angle alpha is set through the inclination angle sensor, when the left end of the U-shaped frame 101 is higher than the right end, the value of the inclination angle alpha is positive angle, and when the left end of the U-shaped frame 101 is lower than the right end, the value of the inclination angle alpha is negative angle; as shown in fig. 9, the distance between the rollers 102 on both sides is AB = L, and the value of L is a fixed value after being produced according to the model of the device and is input to the controller 108 in advance; measuring the vertical distance CD = h1 between the component 2 and the rollers 102 on the two sides, wherein the value h1 is a fixed value after being produced according to the model of the device and is input into the controller 108 in advance; if the vertical foot of the connecting line between the measuring component 2 and the rollers 102 on the two sides is a point D, the distance BD = L1 between the measuring component 2 and the roller 102 on one side is determined, and the value of L1 is a fixed value after being produced according to the model of the device, that is, the distance between each measuring component 2 and the roller 102 on one side is a fixed value and is input into the controller 108 in advance; when the inclination angle of the device measured by the inclination angle sensor is alpha, and the condition of uneven road surface is fed back, the intersection point of the measuring line of the measuring assembly 2 and the ground is E, and DE = h3= AD tan alpha = (L-L1) × tan alpha, namely the distance CE = h1+ h3= h1+ (L-L1) × tan alpha measured by the measuring assembly 2 and the flat road surface is obtained. Inputting the calculation formula into the controller 108, when the device inclines by an angle alpha, the controller calculates a numerical value of CE, and the numerical value of CE is used as a comparison reference value for providing a judgment standard for judging whether the road surface is convex or concave when the flatness of the road surface is continuously measured after the device inclines, and calculating the convex height or concave depth of the road surface to prepare for repairing the road surface;
when the road surface evenness is measured, when the value measured by the measuring component 2 in real time is smaller than the reference value CE, it is indicated that the road surface measured by the measuring component 2 has a bulge, and the bulge amount is obtained by subtracting the reference value CE from the value measured by the measuring component 2 in real time, so that an accurate reference value of the value amount is provided for repairing the bulge on the road surface; when the measured value of the measuring component 2 is greater than the comparison reference value CE, the fact that the measured value of the measured component 2 is that the road surface has the pit is indicated, and the pit depth is the value measured by the measuring component 2 in real time minus the comparison reference value CE, so that an accurate numerical value quantity reference quantity is provided for repairing the pit on the road surface; through the operation, when the road surface of the measured road has bulges or pits, the rollers 102 on two sides are not at the same horizontal height, and the whole device is inclined, the inclination angle sensor of the device can measure the bulge amount or the pit depth of the road surface by matching with the measuring component 2, so that accurate data guidance is provided for further repairing the road, and the adaptability of the device to various road surface conditions during road surface flatness measurement is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a measuring device that is used for road surface roughness to detect usefulness which characterized in that: the device comprises a supporting component (1), wherein a plurality of measuring components (2) which are distributed in a straight line shape are inserted into the supporting component (1), the plurality of measuring components (2) which are distributed in the straight line shape are limited through a limiting component (3), and the limiting component (3) is positioned through a positioning component (4);
the supporting assembly (1) comprises an inverted U-shaped frame (101), rollers (102) are fixedly mounted at the bottom end of the inverted U-shaped frame (101), a plurality of jacks (103) distributed in a straight line shape are formed in the inner top surface of the inverted U-shaped frame (101), a plurality of circular placing grooves (104) matched with the jacks (103) are formed in the upper surface of the inverted U-shaped frame (101), a connecting plate (105) is fixedly mounted on one side surface of the inverted U-shaped frame (101), a vertical plate (106) is fixedly mounted on the upper surface of the connecting plate (105), a display screen (107) with an adjustable angle is arranged at the top end of the vertical plate (106), and a controller (108) and a buzzer (109) are fixedly mounted on the upper surface of the connecting plate (105);
the measuring assembly (2) comprises a measuring sensor (201), the measuring sensor (201) is inserted into the jack (103), a circular baffle (202) is fixedly installed at the top end of the measuring sensor (201), and the circular baffle (202) is located inside the circular placing groove (104);
the limiting component (3) comprises a limiting plate (301), the lower surface of the limiting plate (301) is contacted with the upper surface of the inverted U-shaped frame (101), a convex plate (302) is fixedly arranged on one side surface of the limiting plate (301), a positioning groove (303) is formed in the lower surface of the convex plate (302), both ends of the limiting plate (301) are fixedly provided with an end plate (305), the limiting component (3) also comprises two groups of supports (306), the support seats (306) are fixedly arranged on one surface of the inverted U-shaped frame (101), a fixed column (307) is fixedly arranged between the two support seats (306), a sliding plate (308) is connected to the fixed column (307) in a sliding manner, and a first spring (309) is sleeved on the peripheral side surface of the fixed column (307) and is positioned between the sliding plate (308) and a support (306) close to the limiting plate (301);
the positioning assembly (4) comprises a fixing plate (401), the fixing plate (401) is fixedly installed on one surface of the inverted U-shaped frame (101), a positioning column (402) penetrates through the fixing plate (401), a lower pressing plate (403) is fixedly installed at the bottom end of the positioning column (402), a retaining ring (404) is fixedly sleeved in the middle of the positioning column (402), and a second spring (405) is sleeved on the peripheral side surface of the positioning column (402) and located between the upper surface of the fixing plate (401) and the lower surface of the retaining ring (404); an inclination angle sensor is arranged above the U-shaped frame (101) and is connected with the controller (108); when the whole device is inclined, the inclination angle sensor measures the inclination angle of the device to be alpha and transmits the alpha value to the controller, the distance between the rollers (102) on two sides is AB-L, the vertical distance CD between the measuring component (2) and the connecting line between the rollers (102) on two sides is h1, the distance BD between the measuring component (2) and the roller (102) on one side is L1, when the inclination angle sensor measures the inclination angle of the device to be alpha, the intersection point of the measuring circuit of the measuring component (2) and the ground is E, when DE 3 is AD tan alpha is L-L1 tan alpha, namely the measuring component (2) measures the distance CE between the measuring component and the flat road surface to be h1+ h3 to be h1+ (L-L1) tan alpha, the controller (108) calculates the CE value and uses the CE value as a comparison reference value for continuously measuring the road surface flatness after the device is inclined to judge that the road surface is the road pit or the road is the standard pit or the road pit, and calculating the height of the bumps or the depth of the pits on the road surface.
2. A measuring device for road surface flatness detection according to claim 1, characterized in that: the number of the rollers (102) is four, and the four rollers (102) are arranged in a rectangular shape.
3. A measuring device for road surface flatness detection according to claim 1, characterized in that: the central axes of the insertion holes (103) and the circular placement groove (104) are overlapped, the inner diameter of the circular placement groove (104) is larger than that of the insertion holes (103), and the difference is 1-2 cm.
4. A measuring device for road surface flatness detection according to claim 1, characterized in that: the controller (108) comprises a processor and a control unit, and the display screen (107), the buzzer (109) and the measuring sensor (201) are all connected with the processor.
5. A measuring device for road surface flatness detection according to claim 1, characterized in that: one end, far away from the limiting plate (301), of the convex plate (302) is fixedly provided with a pull ring (304), and the pull ring (304) is a component made of steel alloy.
6. A measuring device for road surface flatness detection according to claim 1, characterized in that: a through hole matched with the fixing column (307) is formed in the sliding plate (308), the diameter of the fixing column (307) is the same as the inner diameter of the through hole in the sliding plate (308), and the peripheral side surface of the fixing column (307) and the inner wall of the through hole in the sliding plate (308) are smooth.
7. A measuring device for road surface flatness detection according to claim 1, characterized in that: the top end face of the positioning column (402) is an arc face, and the arc face is smooth.
8. A measuring device for road surface flatness detection according to claim 1, characterized in that: two side plates (5) are fixedly installed on the outer surface of the inverted U-shaped frame (101), and a limiting bolt (501) is in threaded connection with the inner portion of each side plate (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113465496A (en) * | 2021-07-24 | 2021-10-01 | 吴武基 | Be applied to road construction quality detection device |
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