A high-precision Beckmann beam deflection instrument and its measurement method

Abstract

The present application relates to a high-precision Beckman beam deflectometer and a measurement method thereof, and belongs to the technical field of Beckman beam deflectometers. A high-precision Beckman beam deflectometer includes a base arranged on the ground, a support assembly fixed on the base, a Beckman beam body connected to the support assembly, a detection rod arranged at the end of the Beckman beam body farther from the support assembly, a top rod arranged at the end of the Beckman beam body closer to the support assembly, a limit plate arranged on the upper surface of the top rod, a connecting rod arranged on one end of the base close to the top rod, and a micrometer connected to the connecting rod; a conical groove is provided on the upper surface of the limit plate, and the conical groove corresponds to the upper and lower positions of the probe of the micrometer, and the tip of the probe of the micrometer is conical. The present application has the advantage of high measurement accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of Beckman beam deflectometers, and in particular to a high-precision Beckman beam deflectometer and a measurement method thereof. Background Art

[0002] The deflection value refers to the deformation of the road surface or bridge when it is subjected to load. This value can intuitively show the bearing capacity of the road surface or bridge, and is one of the important parameters of roads such as roads and bridges.

[0003] At present, the industry usually uses Beckman beam deflectometer to measure the deflection value of road surfaces or bridges. Beckman beam deflectometer is an instrument that uses the principle of lever to transfer the settlement displacement of the road surface or bridge at one end of the lever to the other end of the lever for measurement. However, since the settlement displacement of road surfaces and bridges is often very small, the common Beckman beam deflectometer with a simple structure is very likely to produce large errors due to environmental factors during the measurement process, and it is difficult to meet the use requirements of accurately measuring the deflection value.

[0004] In view of the above-mentioned related technical background, the inventors found that the common Beckman beam deflectometer has the defect of low measurement accuracy. Summary of the invention

[0005] In order to improve the measurement accuracy of the Beckmann beam deflectometer, the present application provides a high-precision Beckmann beam deflectometer and a measurement method thereof.

[0006] In the first aspect, the present application provides a high-precision Beckman beam deflectometer using the following technical solution:

[0007] A high-precision Beckman beam deflection instrument comprises a base arranged on the ground, a support assembly fixed on the base, a Beckman beam body connected to the support assembly, a detection rod arranged at the end of the Beckman beam body farther from the support assembly, a push rod arranged at the end of the Beckman beam body closer to the support assembly, a limit plate arranged on the upper surface of the push rod, a connecting rod arranged on the base near one end of the push rod and a micrometer connected to the connecting rod; a conical groove is provided on the upper surface of the limit plate, the conical groove corresponds to the upper and lower positions of a probe of the micrometer, and the tip of the probe of the micrometer is conical.

[0008] By adopting the above technical scheme, the base plays a role of connecting and fixing the support assembly. The hinged structure of the support assembly and the Beckman beam body enables the Beckman beam body and the support assembly to form a lever to meet the measurement requirements. The detection rod located at one end of the Beckman beam body is used to contact the ground, so that the settlement displacement of the ground can be transmitted to the top rod at the other end of the Beckman beam body through the detection rod. The top rod can rise when the detection rod settles, and drive the limit plate to lift the probe of the micrometer, thereby realizing the function of measuring the settlement value of the road surface and bridge in this application. The conical groove on the limit plate can fit tightly with the tip of the probe in the process of lifting the micrometer probe, which plays a role of limiting the probe, which is beneficial to reduce the system error caused by outdoor wind or road vibration, and improves the measurement accuracy of the bending settlement value.

[0009] Optionally, the support assembly includes support legs fixed on the base and symmetrically arranged on both sides of the Beckmann beam, tapered roller bearings passing through the support legs, and connecting blocks passing through the inner ring of the tapered roller bearings; the connecting blocks are clamped with the Beckmann beam.

[0010] By adopting the above technical scheme, the support legs support and limit the tapered roller bearings, and the tapered roller bearings support the connecting blocks, so that the connecting blocks can rotate around the axis of the tapered roller bearings. The connecting blocks connect and fix the Beckman beams. The structural design of the connecting blocks and the Beckman beams can not only firmly connect the Beckman beams and the connecting blocks, but also improve the convenience of the disassembly and assembly process of the present application. The use of tapered roller bearings is conducive to reducing the shaking of the Beckman beams in the direction of the bearing axis, thereby reducing the measurement error and improving the measurement accuracy of the deflection value.

[0011] Optionally, dustproof end covers are provided on both sides of the outer ring of the tapered roller bearing.

[0012] By adopting the above technical solution, the end covers on both sides of the outer ring of the tapered roller bearing can keep the grease in the gap between the outer ring and the inner ring of the bearing for a longer period of time, and at the same time help to prevent foreign objects such as dust and sand from clogging the tapered roller bearing, so that the tapered roller bearing can be subjected to less friction resistance when rotating for a longer period of time, thereby reducing measurement errors and improving the measurement accuracy of deflection values.

[0013] Optionally, a calibration plate is provided on the support leg, and an annular through hole is opened on the calibration plate at a symmetrical position with respect to the support leg, and a marking line is engraved on the calibration plate along a horizontal line passing through the center of the annular through hole; two cylindrical protrusions are provided on the Beckmann beam body in the horizontal direction, and the cylindrical protrusions are passed through the annular through hole.

[0014] By adopting the above technical solution, the cylindrical protrusion installed on the Beckman beam body in the horizontal direction can slide in the annular through hole, and the marking line engraved on the calibration plate in the horizontal direction can mark the horizontal direction, so that the user can judge whether the axial line of the cylindrical protrusion and the marking line are collinear as a basis for whether the Beckman beam body is currently in a horizontal state. The structural design of the calibration plate and the cylindrical protrusion used in combination is conducive to eliminating the systematic error caused by the non-horizontal placement angle of the Beckman beam body before measurement, thereby improving the measurement accuracy of the deflection value.

[0015] Optionally, the detection rod includes a sleeve and a temperature measuring rod inserted into the sleeve.

[0016] By adopting the above technical solution, the sleeve plays a role in fixing the temperature measuring rod and the Beckman beam body, and at the same time, the sleeve plays a protective role for the temperature measuring rod. The structural design of using the temperature measuring rod directly as the support of the Beckman beam body can facilitate the tester to accurately read the real-time temperature of the test point. Compared with the method of re-positioning the test point for temperature measurement after the test, the error in the temperature measurement link is greatly reduced, and the measurement accuracy of the deflection value is improved.

[0017] Optionally, the tip of the temperature measuring rod is tapered.

[0018] By adopting the above technical solution, the conical structural design of the tip of the temperature measuring rod can reduce the contact area between the temperature measuring rod and the ground, which is beneficial to reduce the system error caused by uneven force on the temperature measuring rod due to the uneven ground, and improves the measurement accuracy of the deflection value.

[0019] Optionally, a knob is provided at one end of the sleeve away from the ground, and the sleeve is threadedly connected to the Beckmann beam body.

[0020] By adopting the above technical solution, the sleeve and the Beckman beam are threadedly connected in such a way that the relative installation positions of the sleeve and the Beckman beam can be adjusted. The knob provided at the end of the sleeve away from the ground enables the user to rotate the sleeve by rotating the knob and finally adjust the height of the sleeve, so that the user can adjust the Beckman beam to a horizontal angle conveniently, which is beneficial to eliminating the system error caused by preventing the angle from being non-horizontal and improves the measurement accuracy of the deflection value.

[0021] Optionally, the lower surface of the base is provided with an anti-slip layer, and the upper surface of the base is evenly provided with a plurality of counterweights along the length direction.

[0022] By adopting the above technical scheme, the anti-slip layer arranged on the lower surface of the base, that is, the anti-slip layer arranged on the contact surface between the base and the ground can increase the friction between the base and the ground, and the counterweight blocks evenly arranged on the upper surface of the base in the extension direction can further increase the friction between the base and the ground by increasing the pressure, so that the application is not prone to relative sliding when measuring the deflection value, thereby improving the stability of the application and thus improving the measurement accuracy of the deflection value.

[0023] In the second aspect, the present application provides a high-precision Beckman beam deflectometer measurement method using the following technical solutions:

[0024] A high-precision Beckman beam deflection meter measurement method comprises the following steps:

[0025] Step a: Assemble the Beckman beam body and the support assembly into a whole, install the micrometer on the connecting rod, and insert the probe of the micrometer into the conical groove of the limit plate;

[0026] Step b: prepare a truck for road loading according to the test standard, and park the truck on the road to be tested;

[0027] Step c: Extend one end of the Beckman beam deflection instrument with the detection rod installed between the two rear wheels of the truck near the center of the road surface, so that the distance between the contact point between the temperature measuring rod and the ground and the contact point between the tire and the ground does not exceed 10 cm, and read the real-time temperature of the test point;

[0028] Step d: By rotating the knob, adjust the Beckmann beam until the axis line of the cylindrical protrusion coincides with the marking line, adjust the height of the connecting rod to make the dial indicator rotate, and then rotate the dial of the dial indicator to make the pointer point to zero;

[0029] Step e: Drive the truck away from the Beckmann beam deflectometer, record the final stable reading A of the dial gauge, calculate the influence coefficient K based on the real-time temperature of the measuring point and the tire pressure of the truck, and the actual deflection value B of the test road surface is B=2×K×A.

[0030] By adopting the above technical solution, the real-time temperature measurement error of the measuring point measured by the present application is small, and the Beckman beam can be kept in a horizontal state before deflection occurs. The operation of inserting the micrometer probe into the conical groove of the limit plate is conducive to steadily lifting the micrometer probe on the limit plate, further reducing the measurement error of the micrometer, thereby achieving the purpose of improving the measurement accuracy of the deflection value.

[0031] Optionally, in step d, after the micrometer pointer is pointed to zero, use a finger to gently tap the upper surface of the Beckmann beam body near the micrometer end to observe whether the micrometer pointer can jump and whether it can return to zero after jumping.

[0032] By adopting the above technical solution, the user can use whether the micrometer jumps after the tapping occurs as the basis for judging the sensitivity of the micrometer, and use whether the pointer can point to zero again after the micrometer jumps as the basis for judging the accuracy of the micrometer. This operation allows the user to screen out some micrometers with usage defects, avoid the adverse effects of micrometers with large errors on the measurement results, and further improve the measurement accuracy of the deflection value.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The base in the present application connects and fixes the support assembly. The hinged structure of the support assembly and the Beckman beam body enables the Beckman beam body and the support assembly to form a lever to meet the measurement requirements. The detection rod at one end of the Beckman beam body is used to contact the ground, so that the settlement displacement of the ground can be transmitted to the top rod at the other end of the Beckman beam body through the detection rod. The top rod can rise when the detection rod settles, and drive the limit plate to lift the probe of the micrometer, thereby realizing the function of the present application to measure the settlement value of the road surface and bridge. The conical groove on the limit plate can fit tightly with the tip of the probe in the process of lifting the micrometer probe, which plays a role in limiting the probe, which is beneficial to reduce the system error caused by outdoor wind or road vibration and improves the measurement accuracy of the deflection value.

[0035] 2. The cylindrical protrusion installed on the Beckman beam body in the horizontal direction in this application can slide in the annular through hole, and the marking line engraved on the calibration plate in the horizontal direction can mark the horizontal direction, so that the user can judge whether the axis line of the cylindrical protrusion and the marking line are collinear as a basis for whether the Beckman beam body is currently in a horizontal state. The structural design of the calibration plate and the cylindrical protrusion used in combination is conducive to eliminating the system error caused by the non-horizontal placement angle of the Beckman beam body before measurement, thereby improving the measurement accuracy of the deflection value.

[0036] 3. In the present application, the user can use whether the micrometer jumps after the tapping occurs as the basis for judging the sensitivity of the micrometer, and use whether the pointer can point to zero again after the micrometer jumps as the basis for judging the accuracy of the micrometer. This operation allows the user to screen out some micrometers with defects in use, avoid the adverse effects of micrometers with large errors on the measurement results, and further improve the measurement accuracy of the deflection value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a high-precision Beckman beam deflectometer disclosed in the embodiments of the present application.

[0038] Figure 2 yes Figure 1 Schematic diagram of the explosion structure at point A in the middle.

[0039] Figure 3 yes Figure 1 A local enlarged schematic diagram of point B in the middle.

[0040] Figure 4 yes Figure 1 A partial enlarged schematic diagram of point C in the middle.

[0041] Explanation of the reference numerals in the accompanying drawings: 1. base; 11. anti-slip layer; 12. counterweight; 2. support assembly; 21. support leg; 22. tapered roller bearing; 23. connecting block; 211. calibration plate; 212. marking line; 221. dustproof end cover; 3. Beckmann beam; 31. cylindrical protrusion; 4. detection rod; 41. sleeve; 42. temperature measuring rod; 411. knob; 5. push rod; 6. limit plate; 61. conical groove; 7. connecting rod; 8. micrometer. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 - Provide further details of this application.

[0043] The deflection value refers to the displacement of a bridge or road surface after it has been subjected to a certain load. The deflection value can be used to indicate the ability of a bridge or road surface to withstand loads. The industry usually uses a Beckman beam deflectometer to measure the deflection value. However, in actual operation, since the deflection value is usually a relatively small displacement change, the Beckman beam deflectometer based on the lever principle is prone to large measurement errors due to environmental factors. The deflection value calculation formula involves the selection of the temperature influence coefficient, and the selection of the temperature influence coefficient requires the real-time temperature of the measurement point. The operation method of measuring first and then measuring the temperature in the prior art increases the error in the deflection value measurement. In order to improve the measurement accuracy of the Beckman beam deflectometer, the present application provides a high-precision Beckman beam deflectometer and a measurement method thereof.

[0044] The present application embodiment discloses a high-precision Beckman beam deflectometer. Figure 1 A high-precision Beckman beam deflection instrument comprises a base 1, a support assembly 2, a Beckman beam body 3, a detection rod 4, a push rod 5, a limit plate 6, a connecting rod 7 and a micrometer 8. Among them, one end of the support assembly 2 is fixedly connected to the central position of the base 1, the other end of the support assembly 2 is connected to the Beckman beam body 3 by a snap-on method, the end of the Beckman beam body 3 farther from the support assembly 2 is connected to the detection rod 4 by a threaded connection, the end of the Beckman beam body 3 closer to the support assembly 2 is fixedly connected to one end of the push rod 5 by welding, the limit plate 6 is fixedly connected to the other end of the push rod 5, one end of the connecting rod 7 is detachably connected to the micrometer 8, and the probe tip of the micrometer 8 abuts against the limit plate 6.

[0045] Reference Figure 1The base 1 can be a long rectangular metal plate. The base 1 can be made of aluminum alloy. The lower surface of the base 1 is installed with an anti-slip layer 11 by adhesive bonding. The anti-slip layer 11 can be a rectangular gasket made of hard rubber. The upper surface of the base 1 is installed with multiple counterweights 12 in the extension direction by bolt connection. The counterweights 12 can be made of iron rectangular metal blocks.

[0046] Reference Figure 1 and Figure 2 The support assembly 2 includes a support leg 21, a tapered roller bearing 22 and a connecting block 23. The support leg 21 can be a rectangular metal plate made of aluminum alloy. The number of the support legs 21 can be set to two. One end of the support leg 21 is welded to the upper surface of the base 1. The end of the support leg 21 away from the base 1 is provided with a circular through hole, and the tapered roller bearing 22 is clamped in the through hole. The connecting block 23 can be composed of a cylinder with one end passing through the inner ring of the tapered roller bearing 22 and a trapezoidal block sleeved on the cylinder. The material of the connecting block 23 can be aluminum alloy. The support leg 21 is bolted A calibration plate 211 is detachably connected, and the calibration plate 211 can be a square aluminum alloy plate with rounded edges. The calibration plate 211 is provided with an annular through hole at a symmetrical position about the geometric center. A marking line 212 is engraved in the horizontal direction on the calibration plate 211, and the marking line 212 passes through the geometric center of the annular through hole. Red anti-rust paint is applied inside the marking line 212. A dustproof end cover 221 extends inward from the outer ring of the tapered roller bearing 22, and the dustproof end cover 221 extends to the outer surface of the inner ring of the tapered roller bearing 22.

[0047] Reference Figure 1 and Figure 2 The Beckman beam body 3 can be an aluminum alloy beam. A trapezoidal notch is provided in the part of the Beckman beam body 3 close to the connecting block 23, and the notch is used to engage with the connecting block 23. Two cylindrical protrusions 31 are installed on the side of the Beckman beam body 3 close to the calibration plate 211 by an integrated molding manner. The two cylindrical protrusions 31 are located on the same horizontal plane, and the two cylindrical protrusions 31 are both inserted into the annular through hole opened on the calibration plate 211.

[0048] Reference Figure 1 and Figure 3 The detection rod 4 includes a sleeve 41 and a temperature measuring rod 42 inserted in the sleeve 41. The sleeve 41 is threadedly connected to the end of the Beckman beam 3 that is farther from the support assembly 2, a knob 411 is installed on the top of the sleeve 41 by welding, and a temperature measuring rod 42 is inserted in the sleeve 41. The tip of the temperature measuring rod 42 is conical, and the tip of the temperature measuring rod 42 is in direct contact with the ground.

[0049] Reference Figure 1 and Figure 4The top rod 5 can be a rectangular hollow aluminum alloy rod body, one end of the top rod 5 is welded to the upper surface of the end of the Beckman beam body 3 closer to the support assembly 2, and the other end of the top rod 5 is welded to the limit plate 6. The limit plate 6 can be a solid rectangular aluminum alloy plate, and a conical groove 61 is opened on the upper surface of the limit plate 6.

[0050] Reference Figure 1 and Figure 4 One end of the connecting rod 7 is fixedly connected to the base 1 by welding, and the other end of the connecting rod 7 is installed with a micrometer 8 by snap-fitting. The micrometer 8 is installed vertically to the ground. The height of the micrometer 8 makes the probe of the micrometer 8 contact the inner wall of the conical groove 61 of the limit plate 6 and produce a reading of 5 to 10 mm.

[0051] The embodiment of the present application also discloses a high-precision Beckman beam deflectometer measurement method, comprising the following steps:

[0052] Step a: Assemble the Beckman beam body and the support assembly into a whole, install the micrometer 8 on the connecting rod 7, and insert the probe of the micrometer 8 into the conical groove of the limit plate;

[0053] In this step, the connecting block 23 needs to be inserted into the trapezoidal notch on the Beckman beam body 3. During the installation process, care should be taken to ensure that the cylindrical protrusion 31 of the Beckman beam body 3 can be inserted into the annular through hole opened on the calibration plate 211. Before installation, the edges of the cylindrical protrusion 31 and the circular through hole of the calibration plate 211 should be wiped to remove dust and debris to ensure that the cylindrical protrusion 31 can slide without contact in the annular through hole.

[0054] Step b: prepare a truck for road loading according to the test standard, and park the truck on the road to be tested;

[0055] In this step, ensure that the load of the truck is evenly distributed in the truck bed, and test and record the tire pressure of the truck after it is parked stably.

[0056] Step c: Extend one end of the Beckman beam deflection instrument with the detection rod installed between the two rear wheels of the truck near the center of the road surface, so that the distance between the contact point of the temperature measuring rod 42 with the ground and the contact point of the tire with the ground does not exceed 10 cm, and read the real-time temperature of the test point;

[0057] In this step, the Beckmann beam 3 should be located between the two wheels. If necessary, the contact point between the tire and the ground can be determined by applying paint on the truck tire to reduce the distance between the measuring point and the contact point between the tire and the ground.

[0058] Step d: By rotating the knob, adjust the Beckmann beam 3 until the axis line of the cylindrical protrusion 31 coincides with the marking line 212, adjust the height of the connecting rod 7 to make the dial gauge 8 rotate, and then rotate the dial of the dial gauge 8 to make the pointer point to zero;

[0059] In this step, the Beckman beam 3 should be leveled first, that is, the axis line of the cylindrical protrusion 31 coincides with the marking line 212, and then the micrometer 8 is adjusted and the reading of the micrometer 8 is returned to zero to avoid the micrometer 8 showing readings not related to ground settlement displacement during the leveling process.

[0060] Step e: Drive the truck away from the Beckmann beam deflectometer, record the final stable reading A of the dial gauge 8, calculate the influence coefficient K based on the real-time temperature of the measuring point and the tire pressure of the truck, and the actual deflection value B of the test road surface is B=2×K×A.

[0061] In this step, before driving away from the loaded vehicle, the user should gently tap the upper surface of the Beckman beam body 3 near the end of the micrometer 8 with the knuckles of the fingers to observe whether the micrometer 8 can jump correctly and whether it can re-point to zero after jumping. If not, the micrometer 8 needs to be replaced. After the loaded vehicle drives away, the standard of the micrometer 8 begins to rotate, and the best reading time should be determined when the rotation speed of the pointer of the micrometer 8 is less than 0.2 grids per second.

[0062] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision Beckman beam deflectometer, characterized in that: The invention comprises a base (1) arranged on the ground, a support assembly (2) fixed on the base (1), a Beckmann beam (3) connected to the support assembly (2), a detection rod (4) arranged at the end of the Beckmann beam (3) farther from the support assembly (2), a push rod (5) arranged at the end of the Beckmann beam (3) closer to the support assembly (2), a limit plate (6) arranged on the upper surface of the push rod (5), a connecting rod (7) arranged on the base (1) near one end of the push rod (5), and a micrometer (8) connected to the connecting rod (7); a conical groove (61) is formed on the upper surface of the limit plate (6), and the conical groove (61) corresponds to the upper and lower positions of a probe of the micrometer (8), and the tip of the probe of the micrometer (8) is conical; the support assembly (2) comprises a detection rod (4) fixed on the base (1) and symmetrically arranged on the Beckmann beam (3); Support legs (21) on both sides, tapered roller bearings (22) inserted on the support legs (21), and connecting blocks (23) inserted in the inner rings of the tapered roller bearings (22); the connecting blocks (23) are clamped with the Beckmann beam body (3); a calibration plate (211) is provided on the support legs (21), an annular through hole is opened on the calibration plate (211) at a symmetrical position with respect to the support legs (21), and a marking line (212) is engraved on the calibration plate (211) along a horizontal line passing through the center of the annular through hole; two cylindrical protrusions (31) are provided on the Beckmann beam body (3) in the horizontal direction, the cylindrical protrusions (31) are inserted in the annular through hole, and the cylindrical protrusions (31) slide in the annular through hole without contact; the connecting block (23) is composed of a cylinder with one end inserted in the inner ring of the tapered roller bearing (22) and a trapezoidal block sleeved on the cylinder.

2. A high-precision Beckman beam deflectometer according to claim 1, characterized in that: Dust-proof end covers (221) are provided on both sides of the outer ring of the tapered roller bearing (22).

3. A high-precision Beckman beam deflectometer according to claim 1, characterized in that: The detection rod (4) comprises a sleeve (41) and a temperature measuring rod (42) inserted into the sleeve (41).

4. A high-precision Beckman beam deflectometer according to claim 3, characterized in that: The tip of the temperature measuring rod (42) is conical.

5. A high-precision Beckman beam deflectometer according to claim 3, characterized in that: A knob (411) is provided at one end of the sleeve (41) away from the ground, and the sleeve is threadedly connected to the Beckmann beam body (3).

6. A high-precision Beckman beam deflectometer according to claim 5, characterized in that: The lower surface of the base (1) is provided with an anti-slip layer (11), and the upper surface of the base (1) is provided with a plurality of counterweights (12) evenly arranged along the length direction.

7. A high-precision Beckman beam deflectometer measurement method as claimed in claim 6, characterized in that: The following steps are involved: Step a: Assemble the Beckmann beam body (3) and the support assembly (2) into a whole, install the micrometer (8) on the connecting rod (7), and insert the probe of the micrometer (8) into the conical groove of the limit plate (6); Step b: prepare a truck for road loading according to the test standard, and park the truck on the road to be tested; Step c: Extend one end of the Beckmann beam deflection instrument equipped with the detection rod (4) between the two rear wheels of the truck near the center of the road surface, so that the distance between the contact point between the temperature measuring rod (42) and the ground and the contact point between the tire and the ground does not exceed 10 cm, and read the real-time temperature of the test point; Step d: by rotating the knob (411), the Beckmann beam (3) is adjusted until the axis line of the cylindrical protrusion (31) coincides with the marking line (212), the micrometer (8) is rotated by adjusting the height of the connecting rod, and then the dial of the micrometer (8) is rotated so that the pointer points to zero; Step e: Drive the truck away from the Beckmann beam deflectometer, record the final stable reading A of the dial gauge (8), calculate the influence coefficient K based on the real-time temperature of the measuring point and the tire pressure of the truck, and the actual deflection value B of the test road surface is B=2×K×A.

8. The high-precision Beckman beam deflectometer measurement method according to claim 7, characterized in that: In step d, after the pointer of the micrometer (8) is pointed to zero, the upper surface of the Beckmann beam (3) close to the micrometer (8) is lightly tapped with a finger to observe whether the pointer of the micrometer (8) can jump and whether it can return to zero after jumping.

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