CN111827244A - A kind of Beckman beam deflectometer automatic acquisition device and measurement method - Google Patents

Abstract

The application discloses an automatic acquisition device and a measurement method of a Beckman beam deflectometer, which comprise an auxiliary acquisition vehicle, a Beckman beam and an information monitoring system; the auxiliary collecting vehicle comprises a frame body, a bracket vertically and slidably mounted on the frame body, a height adjusting piece for adjusting the height of the bracket and a mounting frame; the end part of the bracket is positioned outside the rack, and the Beckman beam is placed and supported at the end part of the bracket; the information monitoring system comprises a displacement sensor, a distance measuring sensor, a micro-processing unit, a display unit and a power supply unit; the displacement sensor is used for automatically and continuously acquiring the data of the rebound deflection of the road subgrade; the distance measuring sensor is used for automatically and continuously acquiring the distance between the standard vehicle and a measuring point; and the micro-processing unit processes, displays, stores and outputs the data collected by the displacement sensor and the distance measuring sensor. The automatic acquisition device and the measurement method of the Beckman beam deflectometer can acquire data in real time, improve the field detection efficiency and enable the measurement result to be more accurate and reliable.

Description

A kind of Beckman beam deflectometer automatic acquisition device and measurement method

technical field

The application relates to the field of pavement roadbed deflection measurement, in particular to an automatic acquisition device and a measurement method for a Beckman beam deflection instrument.

Background technique

The deflection value is the amount of deformation of the subgrade and pavement before and after the load acts on the subgrade/pavement. If the deflection value is too large, the deformation will be larger, and the various layers of the pavement will be easily damaged. As an important detection index, deflection value reflects the overall strength and quality of the pavement. Therefore, accurately measuring the characteristic curve of the pavement deflection basin plays an extremely important role in understanding the variation law of the pavement deflection, accurately evaluating the pavement quality, and objectively estimating the pavement life.

At present, the Beckman beam method is mainly used to measure the springback deflection of pavement subgrade in highway construction. The main equipment used in this method includes a standard car and a Beckmann beam. The Beckman beam establishes a lever fulcrum at one-third of the overall length of the beam, which divides the beam body into a longer forearm and a shorter rear arm (i.e. the front , the rear arm length ratio is 2:1). The forearm is in contact with the roadbed/pavement, and the rear arm is equipped with a dial indicator mechanical displacement gauge.

During the deflection test, the standard car moves forward slowly and applies a load to the road surface to deform the road surface. The dial indicator continues to rotate forward with the increase of road surface deformation. The car continues to move forward, and the dial indicator needle rotates in the opposite direction. After the needle rotates steadily, read the final reading again.

However, when using the Beckman beam deflectometer for testing, there are the following shortcomings: 1. 4 people are required to complete the handling of the Beckman beam arm, the installation and zero adjustment of the dial indicator, and the reading and recording of test data, which consumes human resources. More, the labor intensity of personnel is high, and the work efficiency is low; 2. The test process is greatly affected by human factors, and the accuracy of the test results cannot be better guaranteed.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide an automatic collection device and measurement method for a Beckman beam deflectometer, which can collect data in real time, improve on-site detection efficiency, and make measurement results more accurate and reliable.

The above-mentioned purpose one of the present application is achieved through the following technical solutions:

An automatic collection device for a Beckman beam deflectometer, comprising an auxiliary collection vehicle, a Beckman beam, and an information monitoring system; the auxiliary collection vehicle comprises a frame body with a transport platform, a bracket vertically slidably installed on the frame body, A height adjustment member that drives the bracket to move back and forth along the height direction, and a mounting frame that is telescopic in length; the end of the bracket is located outside the frame, and the Beckman beam is placed and supported on the end of the bracket; the information monitoring system includes Displacement sensor, distance measuring sensor, micro-processing unit, display unit and power supply unit; the displacement sensor is installed on the mounting frame, and is used to automatically and continuously collect the rebound and deflection value data of the roadbed; the distance measuring sensor is installed on the frame On the body, it is used to automatically and continuously collect the distance between the standard vehicle and the measuring point; the micro-processing unit processes, displays, stores and outputs the data collected by the displacement sensor and the distance-measuring sensor; the display unit is used to output the micro-processing unit The processed data; the power supply unit supplies power to connect the displacement sensor, the distance measuring sensor, the microprocessor unit, and the display unit.

By adopting the above technical solution, the Beckman beam can be directly placed on the end of the bracket, and transferred to the next measurement point together with the auxiliary acquisition vehicle, without the need for four workers to carry it, effectively liberating labor and improving the efficiency of on-site inspection; The monitoring system can automatically and continuously collect data, and completely store the required collected data in the micro-processing unit in real time, which makes up for the deficiency that the mechanical dial indicator can only detect the deflection value of a single point in the existing Beckman beam measurement method. It ensures the real-time, multi-point continuity and integrity of the required data and eliminates errors that may occur during manual reading.

The present application is further configured as follows: the frame body includes a frame with a rectangular shape, vertical poles arranged at the corners of the frame, and a transportation platform, the poles are arranged vertically, the top of the pole is fixed to the frame, and the bottom is fixed to the transportation platform , and a self-locking universal wheel is installed at the bottom of the transport platform.

By adopting the above technical solution, the frame body composed of the frame, the vertical pole and the transport platform provides the installation basis for the bracket and the information monitoring system, so as to realize the functions of Beckman beam handling and real-time information collection.

The present application is further configured as follows: the bracket is mainly composed of two cross-distributed straight plates, the ends of the bracket are slidably matched with the vertical rod; the height adjusting member includes a lead screw vertically rotatably installed on the frame body and a force-applying piece installed on the top of the lead screw, which is threadedly connected to the bracket.

By adopting the above technical solution, the brackets are arranged crosswise and slidingly cooperate with the vertical rods of the frame body, so that the brackets can provide support for the Beckman beam, and at the same time, the interior of the frame body is divided into several triangular areas, which effectively improves the frame body. stability. The lead screw is used to drive the bracket to lift and reciprocate, and the thread transmission is smooth and fast, which makes the Beckman beam more stable on the bracket.

The present application is further provided as follows: the mounting frame includes a telescopic rod, a mounting seat for horizontally installing the telescopic rod on the transport platform, and a clamping piece connected to the movable end of the telescopic rod, the clamping piece has an elastic jaw, the The displacement sensor is located in the spring clip.

The present application is further provided as follows: the movable end of the telescopic rod is vertically fixed with a connecting rod, the clamping member includes a sliding sleeve slidably installed on the connecting rod, and a clamping plate horizontally fixed on the sliding sleeve, so The elastic clip is arranged at the end of the clamping plate away from the sliding sleeve; the sliding sleeve is positioned on the connecting rod through a jacking wire.

By adopting the above technical solution, the displacement sensor is installed in the elastic jaw, the length direction adjustment is realized by the telescopic rod, and the height direction adjustment is realized by the cooperation of the sliding sleeve and the connecting rod, so as to realize the precise adjustment and installation of the displacement sensor.

The present application is further configured as follows: the installation racks are arranged in two groups, which are arranged oppositely on both sides of the transport platform; and the telescopic rods of the two groups of installation racks are arranged in an up and down dislocation.

By adopting the above technical scheme, the auxiliary collecting vehicle can measure the Beckman beams on both sides at the same time, and the measured data can be compared and corrected, thereby improving the accuracy of the measurement.

The present application further provides that: the information monitoring system further includes a temperature sensor for automatically and continuously collecting the road surface temperature.

By adopting the above technical scheme, the on-site temperature factor can be referred to when processing data, and the accuracy of the data can be improved.

The present application is further set up as follows: the information monitoring system further includes an incremental encoder, and the incremental encoder is signal-connected to the micro-processing unit, and is used for setting the measuring point and the time interval for the data collected and processed by the micro-processing unit. , logical calculation.

The above-mentioned purpose two of the present application is achieved through the following technical solutions:

A measurement method of an automatic acquisition device for a Beckman beam deflectometer, comprising the following processes:

Check and maintain the condition of the standard car, and align the rear wheel clearance of the standard car at a position 3-5cm behind the measuring point;

Check the components and connection nodes in the information monitoring system;

Manually insert the Beckman beam into the rear wheel gap of the standard car, the Beckman beam is in the same direction as the standard car, and the Beckman beam probe is located 3-5cm in front of the center of the wheel gap;

Adjust the position of the positioning auxiliary collection vehicle, adjust the length and height of the installation frame, and install the displacement sensor on the installation frame so that the displacement sensor is in contact with the Beckman beam, and the entire information monitoring system is in the state of data collection;

The commander issues a forward command, the standard car moves forward, the information monitoring system first collects a maximum value, and collects a final value when the standard car drives out of the affected distance, and the micro-processing unit processes and stores the measured data to complete the measurement of the measuring point;

Place the Beckman beam to support the end of the bracket, use the lead screw to lift the bracket to advance the Beckman beam, and go to the next measurement point with the auxiliary acquisition vehicle;

Repeat the above steps to continuously and completely detect the springback and deflection value of the pavement subgrade, and finally process the output data.

To sum up, the present application has the following beneficial effects: by preparing an auxiliary collection vehicle for the Beckman beam, the Beckman beam can be placed on the auxiliary collection vehicle for synchronous transfer; an information monitoring system is set up on the auxiliary collection vehicle to automatically and continuously collect Data, real-time and complete storage of the required data in the micro-processing unit, makes up for the fact that the mechanical dial indicator can only detect the deflection value at a single point in the existing Beckman beam measurement method for measuring the rebound deflection of pavement subgrade. Insufficient, to ensure the real-time, multi-point continuity, integrity of the required data and to eliminate errors that may occur during manual reading.

Description of drawings

Fig. 1 is the structural representation of Beckman beam deflectometer automatic acquisition device in the embodiment;

2 is a schematic structural diagram of an auxiliary collection vehicle in an embodiment;

FIG. 3 is a schematic block diagram of an information monitoring system in an embodiment.

In the figure, 1. Auxiliary acquisition vehicle; 11. Transportation platform; 12. Pole; 13. Frame; 14. Universal wheel; 2. Beckman beam; 3. Information monitoring system; 31. Displacement sensor; 32. Ranging sensor; 33, temperature sensor; 34, microprocessor unit; 35, incremental encoder; 36, display unit; 37, power supply unit; 4, bracket; 5, height adjustment piece; 51, lead screw; 52, force application 6. Mounting frame; 61. Telescopic rod; 611, Inner rod; 612, Outer tube; 62, Mounting seat; 63, Clamping piece; 631, Sliding sleeve; 64. Connecting rod.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings.

An automatic acquisition device for a Beckman beam deflectometer, as shown in FIG. 1 , includes an auxiliary acquisition vehicle 1 , a Beckman beam 2 and an information monitoring system 3 . The Beckman beam 2 can be placed on the auxiliary collection vehicle 1 and transferred through the auxiliary collection vehicle 1; the information monitoring system 3 is installed on the auxiliary collection vehicle 1 to measure and record the data related to the road deflection value in real time.

As shown in FIG. 1 and FIG. 2 , the auxiliary collecting vehicle 1 includes a transport platform 11 . The top of the transport platform 11 is vertically fixed with four vertical poles 12 distributed in a rectangular shape, and the top of the vertical pole 12 is fixed with a rectangular frame 13 horizontally. , the frame 13, the vertical rod 12 and the transport platform 11 constitute the frame body of the auxiliary collection vehicle 1; the bottom of the transport platform 11 is installed with a self-locking universal wheel 14, so that the frame body can be transferred or positioned.

A bracket 4 and a height adjusting member 5 for adjusting the height of the bracket 4 are horizontally arranged in the frame of the auxiliary collecting vehicle 1 . The shape of the bracket 4 is X-shaped, which is formed by splicing two cross-distributed straight plates; the overlapping part of the bracket 4 itself is located in the center of the transport platform 11, and its end extends out of the frame for hanging and supporting the Baker Man beam 2; bracket 4 is provided with a through hole at the position close to its own end, and bracket 4 is sleeved on the vertical rod 12 through the through hole, so as to be slidingly matched with the frame body.

The height adjusting member 5 includes a lead screw 51 and a force-applying member 52. The bottom of the lead screw 51 vertically passes through the overlapping portion of the bracket 4, and is installed on the transport platform 11 through rotation in cooperation with the bearing seat fixed on the transport platform 11; A support plate is fixed horizontally on the frame 13 of the body, and the top of the lead screw 51 passes through the support plate and is rotatably matched with the support plate through a bearing. In this embodiment, the force applying member 52 is selected as a manual crank handle, which is fixed on the top of the lead screw 51 .

The force-applying member 52 drives the lead screw 51 to rotate, so that the bracket 4 moves up and down along the axis of the lead screw 51. The lifting process is more stable.

A length-adjustable mounting frame 6 is also arranged in the frame body, and the mounting frame 6 is located below the bracket 4 . The mounting frame 6 includes a telescopic rod 61 , a mounting seat 62 for horizontally mounting the telescopic rod 61 in the frame body, and a clamp 63 connected to the movable end of the telescopic rod 61 .

Specifically, the mounting seat 62 is fixed on the top of the transport platform 11, and the mounting seat 62 itself is provided with a mounting hole horizontally; the telescopic rod 61 includes an inner rod 611 and an outer tube 612, and the outer tube 612 passes through the mounting hole and is connected with the mounting seat 62. Fixed connection; the inner rod 611 passes through the outer tube 612 and is slidingly matched with the outer tube 612 . The cross section of the telescopic rod 61 is set to a rectangle, or a slider is fixed on the peripheral surface of the inner rod 611, and a chute is opened on the outer tube 612. Smooth sliding movement in the tube 612.

The outer pipe 612 is threadedly connected with a jacking wire, and the end of the jacking wire can pass through the pipe wall and press against the inner rod 611 , so as to realize the positioning of the inner rod 611 in the outer pipe 612 .

The clamping member 63 is provided with an elastic clip 633 for clamping and installing the components in the information monitoring system 3; Position adjustment in the horizontal direction.

Further, a connecting rod 64 is fixed vertically upward at the end of the inner rod 611 away from the outer tube 612 ; the clamping member 63 is provided with a sliding sleeve 631 slidably matched with the connecting rod 64 . A clamping plate 632 is formed radially extending, and an elastic jaw 633 is opened at the end of the clamping plate 632; the sliding sleeve 631 slides on the connecting rod 64 to drive the components installed on the clamping plate 632 to move synchronously , so as to realize the position adjustment of components in the vertical direction. The sliding sleeve 631 is also fixedly connected to the connecting rod 64 through the jacking wire.

The outer tube 612 of the telescopic rod 61 is completely located in the frame through the mounting seat 62, and the outer tube 612 faces the end of the inner rod 611, leaving a gap with the edge of the frame, so that after the inner rod 611 is retracted into the outer tube 612, the clamp The holder 63 is located at this interval, that is, the holder 63 is also located in the frame body, so as to prevent the components mounted on the holder 63 from being bumped and damaged when the auxiliary collecting vehicle 1 moves, and protects the components.

The mounting racks 6 are arranged in two groups in the rack body, and are arranged oppositely on the transport platform 11; the telescopic rods 61 of the two groups of mounting racks 6 are coaxial, and are distributed up and down to avoid position interference.

As shown in FIG. 3 , the information monitoring system 3 includes a displacement sensor 31 , a distance sensor 32 , a temperature sensor 33 , a microprocessor unit 34 , an incremental encoder 35 , a display unit 36 and a power supply unit 37 .

Wherein, the displacement sensor 31 is installed in the elastic jaw 633 of the clamping member 63, and is used for automatically and continuously collecting the rebound deflection value data of the roadbed.

The distance measuring sensor 32 is installed on the frame, and is used to automatically and continuously collect the distance between the standard vehicle and the measuring point.

The temperature sensor 33 is installed on the transport platform 11 for automatically and continuously collecting the road surface temperature.

The micro-processing unit 34 is installed on the frame, and can be connected with the displacement sensor 31, the distance sensor 32, and the temperature sensor 33 through wireless communication to process and store the data collected by the displacement sensor 31, the distance sensor 32, and the temperature sensor 33. and output.

The incremental encoder 35 is installed on the frame and is connected to the micro-processing unit 34 in signal;

The display unit 36 is installed on the frame 13 of the frame body and is connected with the micro-processing unit 34 for displaying the data processed by the micro-processing unit 34; the micro-processing unit 34 can be connected to the printer by means of a USB interface or a Bluetooth signal connection, Print out the data.

The power supply unit 37 is used as a power supply source, and is connected to each component in the information monitoring system 3 for power supply.

The concrete measurement process of the Beckman beam 2 deflectometer automatic collection device of the present application is as follows:

Check and keep the condition and braking performance of the standard car in good condition, and align the rear wheel gap of the standard car at a position about 3-5cm behind the measuring point;

Check whether the components and connection nodes in the information monitoring system 3 meet the requirements to be tested;

Manually insert the Beckman beam 2 into the rear wheel gap of the standard car. The Beckman beam 2 is in the same direction as the standard car, and the beam arm must not touch the tire. The Beckman beam 2 probe is located 3-5cm in front of the center of the wheel gap;

Adjust the position of the positioning auxiliary collection vehicle 1, adjust the length and height of the mounting frame 6, and install the displacement sensor 31 on the mounting frame 6, so that the displacement sensor 31 is in contact with the Beckman beam 2, and the entire information monitoring system 3 is in the open state to collect data ;

The commander issues a forward command, the standard vehicle moves forward, the information monitoring system 3 first collects a maximum value, and collects a final value when the standard vehicle travels out of the affected distance (more than 3 meters), and the micro-processing unit 34 processes and stores the measured data. Complete the measurement of the measuring point;

The Beckman beam 2 is placed and supported on the end of the bracket 4, the lead screw 51 is used to lift the bracket 4 to advance the Beckman beam 2, and the auxiliary acquisition vehicle 1 goes to the next measuring point;

Repeat the above steps to continuously and completely detect the springback and deflection value of the pavement subgrade, and finally process the output data.

In the above-mentioned measurement process, when the standard vehicle moves forward, the information monitoring system 3 starts to collect data, and stops collecting until the distance measuring sensor 32 shows that the standard vehicle is 5 meters away from the measuring point;

The collected data includes the displacement sensor 31 synchronously collecting the rebound and deflection value of the roadbed, the distance measuring sensor 32 monitoring the distance between the measuring point and the standard vehicle, and the temperature sensor 33 collecting the air temperature and road surface temperature during the test;

The collection process is collected continuously according to the set time interval, such as 5ms or less;

The microprocessing unit 34 obtains the initial reading (maximum value) and the final reading (the last value) in a series of data of the nth measuring point, and calculates the measured value of the nth measuring point through the incremental encoder 35 = (initial reading - final reading)*2, and display the measured value through the display unit 36.

This specific embodiment is only an explanation of the application, and it does not limit the application. Those skilled in the art can make modifications to the embodiment without creative contribution as needed after reading this specification, but as long as the rights of the application are All claims are protected by patent law.

Claims (10)

1. a Beckman beam deflectometer automatic acquisition device, is characterized in that: comprise auxiliary acquisition vehicle (1), Beckman beam (2), information monitoring system (3); The auxiliary collecting vehicle (1) comprises a frame body with a transport platform (11), a bracket (4) vertically slidably mounted on the frame body, and a height adjusting member ( 5), and a mounting frame (6) with a telescopic length; The end of the bracket (4) is located outside the frame, and the Beckman beam (2) is placed and supported on the end of the bracket (4); The information monitoring system (3) includes a displacement sensor (31), a ranging sensor (32), a microprocessing unit (34), a display unit (36) and a power supply unit (37); The displacement sensor (31) is installed on the mounting frame (6), and is used to automatically and continuously collect the rebound deflection value data of the roadbed; The distance measuring sensor (32) is installed on the frame, and is used to automatically and continuously collect the distance between the standard vehicle and the measuring point; The micro-processing unit (34) processes, displays, stores and outputs the data collected by the displacement sensor (31) and the distance measuring sensor (32); The display unit (36) is used for outputting the data processed by the microprocessing unit (34); The power supply unit (37) is connected to the displacement sensor (31), the distance measuring sensor (32), the microprocessing unit (34) and the display unit (36) for power supply. 2 . The automatic acquisition device for Beckman beam deflectometer according to claim 1 , wherein the frame body comprises a frame (13) with a rectangular shape, and upright rods (12) arranged at the corners of the frame (13). 3 . ) and a transport platform (11), the vertical rod (12) is arranged vertically, the top of which is fixed to the frame (13), and the bottom is fixed to the transport platform (11), and the bottom of the transport platform (11) is installed with an automatic Lock the swivel wheel (14). 3. The automatic acquisition device for Beckman beam deflectometer according to claim 2, characterized in that: the bracket (4) is mainly composed of two cross-distributed straight plates, and the end of the bracket (4) It is slidingly matched with the vertical rod (12); the height adjustment member (5) includes a lead screw (51) installed on the frame body for vertical rotation and a force applying member (52) installed on the top of the lead screw (51), so The lead screw (51) is threadedly connected with the bracket (4). 4. The automatic acquisition device for the Beckman beam deflectometer according to claim 2, wherein the mounting frame (6) comprises a telescopic rod (61), and the telescopic rod (61) is horizontally installed on the transport platform (11). ), and a clamp (63) connected to the movable end of the telescopic rod (61), the clamp (63) has an elastic jaw (633), and the displacement sensor (31) is located at in the elastic jaw (633). 5 . The automatic acquisition device for the Beckman beam deflectometer according to claim 4 , wherein the movable end of the telescopic rod ( 61 ) is vertically fixed with a connecting rod ( 64 ), and the clamping member ( 63 ). ) comprises a sliding sleeve (631) slidably mounted on the connecting rod (64), and a clamping plate (632) horizontally fixed on the sliding sleeve (631), the elastic clamping opening (633) is provided on the clamping plate (632) An end away from the sliding sleeve (631); the sliding sleeve (631) is positioned on the connecting rod (64) by a jack wire. 6. The automatic collection device of the Beckman beam deflectometer according to claim 5, characterized in that: the mounting brackets (6) are arranged in two groups, which are relatively arranged on both sides of the transport platform (11); two groups of mounting brackets are arranged. The telescopic rod (61) of (6) is arranged in a dislocation up and down position. 7 . The automatic acquisition device of the Beckman beam deflectometer according to claim 1 , wherein the information monitoring system ( 3 ) further comprises a temperature sensor ( 33 ) for automatically and continuously collecting the road surface temperature. 8 . 8. The automatic acquisition device of the Beckman beam deflectometer according to claim 1, characterized in that: the information monitoring system (3) further comprises an incremental encoder (35), the incremental encoder (35) and the microcomputer The processing unit (34) is connected with a signal, and is used for setting measuring point stakes, time interval setting and logical calculation on the data collected and processed by the microprocessing unit (34). 9. a measuring method utilizing the Beckman beam deflectometer automatic acquisition device described in any one of claims 1-8, is characterized in that: comprise the following process: Check and maintain the condition of the standard car, and align the rear wheel clearance of the standard car at a position 3-5cm behind the measuring point; Check the components and connection nodes in the information monitoring system (3); Manually insert the Beckman beam (2) into the rear wheel gap of the standard car, the Beckman beam (2) is in the same direction as the standard car, and the Beckman beam (2) probe is located 3-5cm in front of the center of the wheel gap; Adjust the position of the positioning auxiliary collecting vehicle (1), adjust the length and height of the mounting frame (6), and install the displacement sensor (31) on the mounting frame (6), so that the displacement sensor (31) is connected to the Beckman beam (2) contact, the entire information monitoring system (3) is in the state of enabling data collection; The commander issues a forward command, the standard vehicle moves forward, and the information monitoring system (3) first collects a maximum value, and collects a final value when the standard vehicle travels out of the affected distance. The microprocessing unit (34) processes and stores the measured data, and completes the process. The measuring point is measured; Place and support the Beckman beam (2) on the end of the bracket (4), use the lead screw (51) to lift the bracket (4) to advance the Beckman beam (2), and follow the auxiliary collection vehicle (1) to the next measurement. point; Repeat the above process to continuously and completely detect the springback and deflection value of the pavement subgrade, and finally process the output data. 10. The measurement method of the Beckman beam deflectometer automatic collection device according to claim 9, wherein the collected data comprises a displacement sensor (31) synchronously collecting the rebound deflection value of the pavement roadbed, a ranging sensor (32) ) monitor the distance between the measuring point and the standard vehicle, and the temperature sensor (33) collects the air temperature and road surface temperature during the test.

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