A concrete strength detection device and a detection method thereof

Abstract

The application discloses a concrete strength detection device and a detection method thereof. The detection device comprises a laser emission device and an ultrasonic wave emission device which are communicatively connected. The laser emission device comprises a laser emission host and a mounting panel arranged on the laser emission host. Five laser emission and receiving devices are arranged on the mounting panel and located at four vertices and a center of a square. The laser emission host comprises a data processing device and a timing device arranged in the laser emission host. The timing device and the laser emission and receiving devices are connected with the data processing device through lines respectively. The application mainly aims at the problem that it is inconvenient to detect the compressive strength of multiple parts of high-volume concrete. The application can detect the strength of the concrete without climbing the high-volume concrete by using a ladder or a scaffold. The application has the advantages of fast detection speed, high efficiency and effective guarantee of personal safety of the detection personnel.

Description

Technical Field

[0001] This invention belongs to the technical field of construction testing equipment, and relates to a concrete strength testing device and its testing method, which is applicable to the testing of the compressive strength of bridge abutments, piers or other large-volume concrete. Background Technology

[0002] Currently, there are many methods for testing concrete strength, mainly including the rebound hammer test, penetration test, ultrasonic wave velocity test, pull-out test, core sampling test, and maturity test. The rebound hammer test is the most commonly used non-destructive testing method. Because the measurement is performed on the concrete surface, it belongs to the category of surface hardness methods, based on the correlation between concrete surface hardness and strength. The rebound hammer test is simple, convenient, and low-cost. However, it is easily affected by many factors, resulting in low testing accuracy. These factors include the dryness or wetness of the concrete surface, the presence of coarse aggregate at the measuring point, the degree of concrete carbonation, the degree of frost damage, and the presence of reinforcing steel, all of which affect the accuracy of the rebound hammer test. The ultrasonic wave velocity test is also a commonly used method. For example, CN209656629U describes a concrete strength testing device that uses an ultrasonic transmitter and receiver to measure concrete strength using ultrasonic wave velocity. However, a corresponding ultrasonic receiver is still required for measurement. However, for strength testing of large-volume concrete such as bridge abutments and high piers, testing personnel need to climb, which poses safety hazards. At the same time, they need to carry corresponding tools, which is inconvenient and inefficient. In addition, there are many inconveniences in testing different parts of such large-volume concrete. Summary of the Invention

[0003] To address the inconveniences of testing the compressive strength of large-volume concrete at multiple locations in the aforementioned background technology, this invention provides a concrete strength testing device and method. Using this invention, testing personnel can test the concrete strength without using ladders or scaffolding to climb large-volume concrete. The testing is fast, efficient, and effectively ensures the personal safety of testing personnel.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention discloses a concrete strength testing device, which includes a laser emitting device and an ultrasonic emitting device connected by communication. The laser emitting device includes a laser emitting host and a mounting panel disposed on the laser emitting host. Five laser emitters and receivers are respectively located at the four vertices and the center of the same square on the mounting panel. The laser emitting host includes a data processing device and a timing device disposed therein. The timing device and each laser emitter and receiver are respectively connected to the data processing device through lines.

[0006] Furthermore, the detection device also includes a calibration plate. The front of the calibration plate is provided with five central cross marks located at the four vertices and the center of the same square. The square formed by the positions of each central cross mark is consistent with the square formed by the installation positions of each laser emitter and receiver. The four corners of the back of the calibration plate are provided with calibration plate adjustment screws. Horizontal and vertical calibration screws are provided on each of the laser emitters and receivers in the horizontal and vertical directions, respectively.

[0007] Furthermore, the mounting surface of the mounting panel is square, and five laser emitters and receivers are respectively installed at the center and four corners of the mounting panel.

[0008] Furthermore, the laser emitting host is equipped with a temperature sensor and a humidity sensor, which are respectively connected to the data processing device.

[0009] Furthermore, the timing device is a quartz resonator.

[0010] Furthermore, the data processing device is connected to a display device and a data storage device.

[0011] Furthermore, the laser transmitting host is equipped with an electromagnetic wave receiver connected to a data processing device via a line, and the ultrasonic transmitting device is equipped with a radio wave transmitter, with the electromagnetic wave receiver and the radio wave transmitter being communicatively connected.

[0012] Furthermore, the laser emitting device and the ultrasonic emitting device also include a first power supply and a second power supply, respectively. The first power supply is connected to the laser emitting host and each laser emitting and receiving device, and each laser emitting and receiving device is connected to a laser ranging button. The second power supply is connected to the ultrasonic emitting device and the radio wave transmitter, and the ultrasonic emitting device and the radio wave transmitter are connected to ultrasonic and radio wave transmitting buttons.

[0013] The detection method of the concrete strength testing device based on the above technical solution includes the following steps:

[0014] S1. The five laser emitters and receivers of the laser emitting device are aimed at the large-volume concrete part to be tested and form five laser irradiation points corresponding to the distribution of each laser emitter and receiver. At the same time, the timing signal of the timing device is transmitted to the emitted laser.

[0015] S2. Measure the distances from the five laser emitters and receivers to the concrete part to be tested using the laser emitting device, and calculate the spatial angle between the concrete surface to be tested and the laser emitting surface. At the same time, calculate the distance between the five laser irradiation points on the concrete surface and the included angle of the line connecting each laser irradiation point.

[0016] S3. Ultrasonic waves are emitted from the lower surface of the large concrete volume using an ultrasonic transmitter. Each time the ultrasonic transmitter emits an ultrasonic pulse signal, it simultaneously transmits the ultrasonic signal emitted by the ultrasonic transmitter to a laser transmitter. The laser transmitter records the emission time of the ultrasonic pulse.

[0017] S4. Using the laser irradiation device, the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point is used to calculate the time difference of the same ultrasonic wave reaching each laser irradiation point. The laser irradiation point at the center of the five laser irradiation points is taken as the origin of the coordinate system of the concrete surface. The coordinate system of the concrete surface is established by taking the point closest to the ultrasonic irradiation device among the four surrounding laser irradiation points, i.e. the point with the smallest time difference, as the x-axis, and the coordinates of the other four laser irradiation points are calculated.

[0018] S5. Using the transverse wave velocity of the ultrasonic wave in the concrete and the relative coordinates of the ultrasonic transmitter as unknowns, the propagation speed of the ultrasonic transverse wave in the concrete is calculated using the distance between the five laser irradiation points, the angle between the lines connecting the five laser irradiation points, and the time difference of the same ultrasonic wave reaching each laser irradiation point. Then, the compressive strength of the concrete is corrected based on the propagation speed combined with the temperature and humidity of the site.

[0019] Furthermore, if the five laser irradiation points on the concrete surface to be tested are not on the same plane, they can be fitted into a single plane using the least squares method.

[0020] To make the above-mentioned concrete strength testing device and testing method simpler and more convenient, based on the above-mentioned concrete strength testing device, the mounting panel can be rotatably mounted on the laser emitting host, and it can rotate around the laser emitting and receiving receivers at the very center of the five laser emitting and receiving receivers.

[0021] Furthermore, the laser emitting host is provided with a rotating mechanism, and the mounting panel is disposed on the rotating mechanism.

[0022] Furthermore, the rotating mechanism includes a motor, a clockwise rotation button, and a counterclockwise rotation button mounted on the laser emitting host.

[0023] The detection method of the concrete strength testing device based on the above technical solution includes the following steps:

[0024] S1. The five laser emitters and receivers of the laser emitting device are aimed at the large-volume concrete part to be tested and form five laser irradiation points corresponding to the distribution of each laser emitter and receiver. At the same time, the timing signal of the timing device is transmitted to the emitted laser.

[0025] S2. The distances from five laser emitters and receivers to the concrete part to be measured are measured using a laser emitting device;

[0026] S3. Ultrasonic waves are emitted from the lower surface of the large concrete volume using an ultrasonic transmitter. Each time the ultrasonic transmitter emits an ultrasonic pulse signal, it simultaneously transmits the ultrasonic signal emitted by the ultrasonic transmitter to a laser transmitter. The laser transmitter records the emission time of the ultrasonic pulse.

[0027] S4. Using the laser emitting device, the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point is used to calculate the time difference of the same ultrasonic pulse arriving at each laser irradiation point. It is then determined whether the time difference of the same ultrasonic pulse arriving at the laser irradiation points corresponding to the two laser emitters and receivers located at one end of one diagonal of the square is equal. If they are not equal, the mounting panel is rotated to drive the laser emitters and receivers located at the four vertices of the square to rotate. At the same time, the ultrasonic emitting device is controlled to intermittently emit ultrasonic pulses, and the time difference of each ultrasonic pulse arriving at each laser irradiation point is calculated until the time difference of the same ultrasonic pulse arriving at the laser irradiation points corresponding to the two laser emitters and receivers located at one end of one diagonal of the square is equal. At this time, the three laser emitters and receivers located on the other diagonal of the square, the three laser irradiation points corresponding to the three laser emitters and receivers, and the ultrasonic emitting device are located in the same plane.

[0028] S5. Calculate the distance between each pair of adjacent laser irradiation points based on the distances between the three laser irradiation points located in the same plane as the ultrasonic transmitter and their corresponding laser transmitters and receivers, as well as the distances between each laser transmitter and receiver. Then, calculate the transverse wave velocity of the ultrasonic wave in the concrete based on the time difference of the same ultrasonic pulse reaching the three laser irradiation points. Finally, adjust the compressive strength of the concrete based on this propagation velocity combined with the temperature and humidity of the site.

[0029] Further, following step S4, continue rotating the mounting panel so that the ultrasonic transmitter, the three laser transmitters and receivers located on the other diagonal of the square, and the three corresponding laser irradiation points are located in the same plane. Then, following step S5, the compressive strength value of the concrete is obtained and averaged with the previously obtained value.

[0030] Compared to existing technologies, the concrete strength testing device of this invention has a reasonable and simple structural design, making it easy to deploy and use. Combined with its testing method, it can perform compressive strength testing on different parts of various large-volume concrete structures. Testing personnel do not need to climb ladders or scaffolding to reach the concrete to be tested, effectively improving their safety. Furthermore, this invention calculates the time difference between the arrival of ultrasonic waves at the laser irradiation point by using the Doppler phase change caused by ultrasonic vibration. Combined with the calculated distances and angles between the laser irradiation points, the propagation speed of the ultrasonic transverse wave in the concrete is calculated, thus yielding the concrete's compressive strength. Alternatively, by rotating the four peripheral laser transmitters and receivers, the ultrasonic transmitter, three laser transmitters and receivers located on one diagonal of a square, and the corresponding laser irradiation points are positioned at specific locations, allowing for a simple and rapid calculation of the ultrasonic wave velocity in the concrete, thereby determining the concrete's compressive strength. Its testing speed is fast, unrestricted by the testing environment, and effectively improves testing efficiency and results. Attached Figure Description

[0031] Figure 1 This is a front view of the laser emitting device in this invention;

[0032] Figure 2 This is a side view of the laser emitting device in this invention;

[0033] Figure 3 This is a schematic diagram of the ultrasonic transmitting device in this invention;

[0034] Figure 4 This is a front view of the correction plate in this invention;

[0035] Figure 5 This is a side view of the correction plate in this invention;

[0036] Figure 6 This is a schematic diagram of the concrete testing device of the present invention;

[0037] Figure 7 This is a diagram showing the positional relationship between the ultrasonic transmitting device and the five laser irradiation points in this invention.

[0038] Figure 8 This is a schematic diagram of the laser irradiation points in the present invention when the time difference between the arrival of the same ultrasonic pulse at the laser irradiation points corresponding to the two laser emitters and receivers located at the ends of one diagonal of the square is equal after the installation panel is rotated.

[0039] Figure 9This is a schematic diagram of the other three laser emitters and receivers and their corresponding laser irradiation points when the time difference between the arrival of the same ultrasonic pulse at the laser irradiation points corresponding to the two laser emitters and receivers located at the ends of one diagonal of the square is equal after the mounting panel is rotated in this invention.

[0040] Figure 1-6 Components: 1. Laser transmitter and receiver; 2. Horizontal and vertical alignment screws; 3. Laser transmitter; 4. Electromagnetic wave receiver; 5. Ultrasonic transmitter; 6. Radio wave transmitter; 7. Ultrasonic emitting surface; 8. Mounting panel; 9. Calibration plate; 10. Calibration plate adjustment screws; 11. Central cross mark; 12. Data processing device; 13. Data storage device; 14. Display device; 15. Timing device; 16. Temperature sensor; 17. Humidity sensor; 18. Ultrasonic and radio wave transmitting buttons; 19. Laser rangefinder button; 20. First power supply; 21. Second power supply; 22. Communication interface; 23. Laser transmitter main unit; 32. Rotating mechanism; 33. Motor; 34. Clockwise rotation button; 35. Counterclockwise rotation button. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in this invention are well-known to those skilled in the art.

[0042] Example 1:

[0043] like Figures 1 to 6As shown, this invention discloses a concrete strength testing device, comprising a laser transmitter 3 and an ultrasonic transmitter 5 connected by communication. The ultrasonic transmitter 5 has an ultrasonic emitting surface 7 for emitting ultrasonic waves to the concrete to be tested. The laser transmitter 3 includes a laser transmitter host 23 and a mounting panel 8 mounted on the laser transmitter host 23. Five laser transmitters and receivers 1 are mounted on the mounting panel 8, respectively located at the four vertices and the center of the same square. The laser transmitters and receivers 1 have the functions of emitting and receiving lasers and performing phase-based distance measurement. To facilitate the setting of each laser transmitter and receiver 1, the mounting surface of the mounting panel 8 can be... The device is configured in a square shape, with five laser emitters and receivers 1 installed at the center and four corners of the mounting panel 8, so that each laser emitter and receiver 1 is on the same plane and the emitted lasers are parallel in space. The laser emitter host 23 includes a data processing device 12 and a timing device 15 installed inside it. The timing device 15 and each laser emitter and receiver 1 are connected to the data processing device 12 through lines. The data processing device 12 is used to receive various data and instructions, calculate data, and output data and instructions during the detection process of the concrete strength testing device, so as to obtain the compressive strength of the concrete to be tested. In this embodiment, during the measurement of concrete compressive strength, the five laser emitters and receivers 1 of the laser emitting device 3 emit five laser beams towards the test location of the large-volume concrete and transmit timing signals to the emitted laser beams. Then, each laser emitter and receiver 1 uses the phase method to measure the distance from the five laser emitters and receivers 1 to the corresponding laser irradiation point of the concrete test location through the laser emitting device 3 based on the reflected laser beams, and calculates the spatial angle between the concrete surface and the laser emitting surface. Simultaneously, using the spacing between each laser emitter and receiver 1 and the measured distance from it to the concrete surface, the five laser beams on the concrete surface are calculated. The data includes the spacing between irradiation points and the angle between the lines connecting each laser irradiation point; the ultrasonic transmitting device 5 is used to emit ultrasonic waves to the concrete to be tested while measuring the distance through the laser transmitting device 3, and synchronously transmits the signal of each ultrasonic wave to the laser transmitting device 3. The laser transmitting device 3 records the ultrasonic wave emission time, and then uses the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point to calculate the time difference of the same ultrasonic wave arriving at the laser irradiation point. Then, combined with the distance between each laser irradiation point and the angle between the lines connecting each laser irradiation point, the speed of the ultrasonic wave is calculated, and then the compressive strength of the concrete is calculated.

[0044] In this embodiment, the timing device 15 can be configured as a quartz resonator, and the resonant signal can be carried into the laser signal to ensure the accuracy of the timing of the laser emitting device 3.

[0045] In this embodiment, to facilitate communication between the laser emitting host 23 and the ultrasonic emitting device 5, the laser emitting host 23 may be equipped with an electromagnetic wave receiver 4 connected to the data processing device 12 via a line. The ultrasonic emitting device 5 may be equipped with a radio wave transmitter 6. The electromagnetic wave receiver 4 and the radio wave transmitter 6 are connected in communication. Thus, when the ultrasonic emitting device 5 emits an ultrasonic pulse signal, the ultrasonic signal emitted by the ultrasonic emitting device 5 is simultaneously transmitted to the electromagnetic wave receiver 4 through the radio wave transmitter 6, and then transmitted to the data processing device 12. The data processing device 12 records the emission time of the ultrasonic pulse and calculates the time difference between the arrival of the ultrasonic wave at each laser irradiation point.

[0046] In this embodiment, the laser emitting device 3 and the ultrasonic emitting device 5 also include a first power supply 20 and a second power supply 21 that provide power to various components of the laser emitting device 3 and the ultrasonic emitting device 5, respectively. The first power supply 20 and the second power supply 21 can be rechargeable batteries. The first power supply 20 is connected to the laser emitting host 23 and each laser emitting and receiving device 1. Each laser emitting and receiving device 1 is connected to a laser ranging button 19. The second power supply 21 is connected to the ultrasonic emitting device 5 and the radio wave transmitter 6. The ultrasonic emitting device 5 and the radio wave transmitter 6 are connected to an ultrasonic and radio wave transmitting button 18. When the laser ranging button 19 is pressed, the five laser emitting and receiving devices 1 can simultaneously emit lasers for ranging. When the ultrasonic and radio wave transmitting button 18 is pressed, the ultrasonic emitting device 5 emits ultrasonic pulses, and the radio wave transmitter 6 on it simultaneously emits electromagnetic wave signals to the electromagnetic wave receiver 4 of the laser emitting device 3, notifying the laser emitting device 3 to record the ultrasonic emission time.

[0047] In this embodiment, the compressive strength of concrete is usually related to ambient temperature and air humidity. The laser emitting host 23 is equipped with a temperature sensor 16 and a humidity sensor 17 that are respectively connected to the data processing device 12. The compressive strength of concrete is calculated by combining the measurement data of the temperature sensor 16 and the humidity sensor 17 with the data calculated by the data processing device 12.

[0048] In this embodiment, the data processing device 12 may also be connected to a display device 14 and a data storage device 13. The display device 14 may be a display screen or the like, which displays the calculated data in the form of numbers, graphics or the like. The data storage device 13 is used to store the various data obtained by the data processing device 12.

[0049] In this embodiment, the data processing device 12 may also be provided with a communication interface 22, etc., for connecting with other host computers, etc., to exchange data or instructions.

[0050] Example 2:

[0051] Based on the detection method of the concrete strength testing device described in Example 1, it can be used to detect the compressive strength of large-volume concrete. Before detection, the laser emitting device 3 of the concrete strength testing device can be preheated for 3 minutes to maintain a constant temperature of the entire device and ensure the frequency stability of the internal timing device (i.e., the quartz resonator). The detection steps are as follows:

[0052] S1. The five laser emitters and receivers 1 of the laser emitting device 3 are aimed at the large-volume concrete part to be tested and five laser irradiation points are formed corresponding to the installation positions of each laser emitter and receiver 1. At the same time, the timing signal of the timing device 15 is transmitted to the emitted laser.

[0053] S2. The distances from the five laser emitters and receivers 1 to the concrete test area are measured by the laser emitting device 3. Because the concrete surface is not parallel to the laser emitting surface of the laser emitting device 3, the distances measured by each laser emitter and receiver 1 are not equal. The spatial angle between the concrete surface and the laser emitting surface is calculated by the data processing device 12 of the laser emitting device 3. Because the concrete surface may be uneven, the five laser irradiation points are not on the same plane, and the planes generated by each of the three points are different. The least squares method can be used to fit them into a plane for calculation. At the same time, the distances between the five laser irradiation points on the concrete surface and the angles between the lines connecting each laser irradiation point are calculated.

[0054] S3. Ultrasonic waves are emitted from the lower surface of the large concrete volume by ultrasonic transmitter 5. The ultrasonic emission surface 7 rests against the concrete surface. Each time ultrasonic transmitter 5 emits an ultrasonic pulse signal, it transmits the ultrasonic signal emitted by ultrasonic transmitter 5 to laser transmitter 3, and notifies laser transmitter 3 to record the emission time of the ultrasonic pulse.

[0055] S4. Ultrasonic transverse waves propagate along the surface of concrete. When the ultrasonic waves reach the five laser irradiation points, the Doppler frequency of the reflected signal of the laser carrier will change due to ultrasonic vibration. The time difference of the same ultrasonic wave reaching each laser irradiation point is calculated by the laser emitting device 3 using the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point. The center laser irradiation point among the five laser irradiation points is taken as the origin of the coordinate system of the concrete surface. The point closest to the ultrasonic emitting device 5 among the four surrounding laser irradiation points, i.e., the laser irradiation point with the smallest time difference, is taken as the x-axis to establish a plane coordinate system of the concrete surface. The coordinates of the other four laser irradiation points are calculated. The coordinates of the four surrounding laser irradiation points of the center laser irradiation point can be calculated using the spatial plane angle and hypotenuse length of the concrete surface through conventional trigonometric formulas.

[0056] S5. Using the transverse wave velocity of ultrasound in concrete and the relative coordinates (x, y) of the ultrasound transmitter as unknowns, the propagation speed of the transverse wave of ultrasound in concrete is calculated by using the distance between the five laser irradiation points, the angle between the lines connecting the laser irradiation points, and the time difference of the same ultrasound reaching each laser irradiation point. Then, the compressive strength of the concrete is corrected by using this propagation speed and combining it with the temperature and humidity of the site.

[0057] In this embodiment, all calculations are performed by a software program pre-set in the data processing module and the results are transmitted to a data storage device for storage. In this embodiment, after the concrete compressive strength is calculated, a comparative analysis can be performed on the lower surface of the concrete using the rebound method to verify the accuracy of the detection method.

[0058] Because the propagation speed of ultrasound in concrete is greatly affected by factors such as age, density, and aggregate, when using the propagation speed of ultrasound in concrete to correspond to the compressive strength of concrete, it is usually necessary to conduct a limited number of propagation tests in concrete of different specifications in advance to obtain the propagation speed under different specifications.

[0059] For cast-in-place concrete, such as foundation piles, the empirical values ​​are: the wave velocity of C25 concrete piles is generally around 3800 m / s, and that of C30 concrete piles is generally around 4200 m / s. For indoor-formed concrete, such as concrete test blocks, the wave velocity is higher than that of cast-in-place concrete. Specific data can be obtained by conducting a limited number of tests on concrete test blocks of different specifications and then taking the average.

[0060] In addition, if it is a stress wave, under normal conditions, there is also a rough correspondence between the wave velocity and the concrete strength. For example, the wave velocity of C20 concrete is about 3200 m / s, the wave velocity of C25 concrete is about 3500 m / s, the wave velocity of C30 concrete is about 3800 m / s, and the wave velocity of C35 concrete is about 4000 m / s. The above data are all from the longitudinal slope of the pile foundation test. The cross slope data can also be obtained by testing under different conditions.

[0061] Temperature and humidity also affect the propagation speed of sound waves in concrete. By statistically analyzing the relationship between concrete grade, concrete temperature and humidity, and concrete compressive strength under different temperature, humidity, and concrete specifications, and then using data analysis methods to fit the relevant compressive strength calculation formula, the compressive strength can be calculated.

[0062] Example 3:

[0063] like Figure 1-6As shown, based on Embodiment 1, in order to make the compressive strength testing of large-volume concrete more convenient and simple, the mounting panel 8 in the concrete strength testing device can be rotatably set on the laser emitting host 23. It can rotate around the laser emitting and receiving host 1 at the center of the five laser emitting and receiving hosts 1, and then use the four peripheral laser emitting and receiving hosts 1 to rotate synchronously.

[0064] Furthermore, the laser emitting host 23 is provided with a rotating mechanism 32, and the mounting panel 8 is disposed on the rotating mechanism 32. The rotating mechanism 32 includes a motor 33, a clockwise rotation button 34, and a counterclockwise rotation button 35 disposed on the laser emitting host 23. The motor 33 can be controlled to rotate clockwise or counterclockwise by the clockwise rotation button 34 and the counterclockwise rotation button 35, thereby driving the mounting panel 8 to rotate, so that the four peripheral laser emitters and receivers 1 rotate around the central laser emitter and receiver 1.

[0065] In the measurement of concrete compressive strength, five laser emitters and receivers 1 of the laser emitting device 3 are used to emit five laser beams towards the test location of the large-volume concrete, and a timing signal carrier is sent to the emitted laser beams. Then, each laser emitter and receiver 1 uses the phase method to measure the distance from the five laser emitters and receivers 1 to the corresponding laser irradiation point on the concrete test location through the laser emitting device 3 based on the reflected laser beams. The distance between each laser irradiation point on the concrete surface is calculated using the spacing between the laser emitters and receivers 1 and the measured distance from them to the concrete surface. Simultaneously, the ultrasonic transmitter 5 emits ultrasonic waves into the concrete test location through the laser emitting device 3 while measuring the distance. The signal of each ultrasonic wave emitted is synchronously transmitted to the laser emitting device 3. Then, the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point is used to calculate the distance from the same ultrasonic wave to the laser irradiation point. If the time difference between the five laser irradiation points is different, the installation panel 8 is rotated by rotating the clockwise knob 34 or the counterclockwise knob 35. Each time the installation panel 8 rotates by a small angle (e.g., 0.1 to 0.5 degrees), the ultrasonic transmitter 5 emits an ultrasonic pulse signal. When the time difference between the two laser irradiation points corresponding to the laser transmitter and receiver 1 on the two diagonals of the square receiving the same ultrasonic wave is close to synchronization, the installation panel is rotated by a small angle (e.g., 0.01 degrees) until the time difference between the two laser irradiation points corresponding to the laser transmitter and receiver 1 receiving the same ultrasonic wave is completely synchronized. Then, the speed of the ultrasonic wave is calculated by combining the distance between each laser irradiation point and the time difference of the received ultrasonic pulse. Finally, the compressive strength of the concrete is calculated by using the relationship function between concrete strength, air humidity, temperature and the speed of sound waves in the concrete.

[0066] In this embodiment, a control device or remote control corresponding to the laser emitting device 3 and the ultrasonic emitting device 5 can also be set up to control the ultrasonic emitting device 5 simultaneously when controlling the laser emitting device 3, and to precisely control the rotation angle of the mounting panel 8 on the laser emitting device 3 and the interval time of ultrasonic waves emitted by the ultrasonic emitting device 5.

[0067] Example 4:

[0068] like Figure 1-9 As shown, the detection method of the concrete strength testing device described in Example 3 is used to detect the compressive strength of the upper part of large-volume concrete. Before detection, the laser emitting device 3 of the concrete strength testing device can be preheated for 3 minutes to maintain a constant temperature of the entire device and ensure the frequency stability of the internal timing device (i.e., the quartz resonator). The detection steps are as follows:

[0069] S1. The five laser emitters and receivers 1 of the laser emitting device 3 are aimed at the large-volume concrete part to be tested and five laser irradiation points are formed corresponding to the distribution of each laser emitter and receiver 1. At the same time, the timing signal of the timing device 15 is carried to the emitted laser.

[0070] S2. The distances from the five laser emitters and receivers 1 to the concrete part to be measured are measured by the laser emitting device 3. Because the concrete surface and the laser emitting surface of the laser emitting device 3 may not be parallel, the distances measured by each laser emitter and receiver 1 are usually different.

[0071] S3. Ultrasonic waves are emitted from the lower surface of the large concrete volume using an ultrasonic transmitter 5. Each time the ultrasonic transmitter 5 emits an ultrasonic pulse signal, it simultaneously transmits the emitted signal to a laser transmitter 3. The laser transmitter 3 records the emission time of the ultrasonic pulse. Figure 1 and Figure 7As shown, the five laser emitters and receivers are numbered A, B, C, D, and E. After emitting lasers, the concrete surface forms five corresponding laser irradiation points, numbered A', B', C', D', and E'. The ultrasonic transmitter is positioned as the ultrasonic emission point F, located below the five laser irradiation points A', B', C', D', and E'. Because the distance between the ultrasonic emission point F and the five laser irradiation points A', B', C', D', and E' may be unequal, the time difference between the ultrasonic pulse emitted by the ultrasonic emission point F and the arrival time at each laser irradiation point will also be unequal. Only when the midpoint of one diagonal of the line connecting the five laser irradiation points A', B', C', D', and E' or the midpoint of the two parallel sides of the square falls exactly on the foot of the perpendicular from the line connecting the ultrasonic emission point F, and the endpoint of the line segment forms an isosceles triangle with the ultrasonic emission point, will there be one or more identical time differences.

[0072] S4. Using the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point, the laser emitting device 3 calculates the time difference of the same ultrasonic pulse arriving at each laser irradiation point. It then determines whether the time difference of the same ultrasonic pulse arriving at the laser irradiation points corresponding to the two laser emitters and receivers located at one diagonal end of the square is equal. If not, the mounting panel 8 is rotated to rotate the laser emitters and receivers located at the four vertices of the square. Simultaneously, the ultrasonic emitting device is controlled to intermittently emit ultrasonic pulses, with an interval set to 0.1–0.5 seconds. The time difference of each ultrasonic pulse arriving at each laser irradiation point is calculated until the time difference of the same ultrasonic pulse arriving at the laser irradiation points corresponding to the two laser emitters and receivers located at one diagonal end of the square is equal. At this point, the three laser emitters and receivers located on the other diagonal of the square, the three corresponding laser irradiation points, and the ultrasonic emitting device are located in the same plane. Specifically, as shown... Figure 8 As shown, after the mounting panel 8 is rotated, the time difference between the laser irradiation points B' and D' receiving the ultrasonic pulses emitted from the ultrasonic emission point F is the same. At this time, the ultrasonic emission point F and the laser irradiation points B' and D' can form an isosceles triangle. The three laser emitters and receivers located on the other diagonal of the square on the mounting panel 8, numbered A, E and C, the corresponding laser irradiation points A', E' and C', and the ultrasonic emission device F are all in the same plane.

[0073] S5. Calculate the distance between each pair of adjacent laser irradiation points based on the distances between the three laser irradiation points located in the same plane as the ultrasonic transmitter and their corresponding laser transmitters and receivers, as well as the distances between each laser transmitter and receiver. Then, calculate the transverse wave velocity of the ultrasonic wave in the concrete based on the time difference of the arrival of the same ultrasonic pulse at the three laser irradiation points. Finally, adjust the compressive strength of the concrete based on this propagation velocity combined with the on-site temperature and air humidity. Specifically, Figure 9 The diagram shows that after the mounting panel 8 is rotated, the three laser emitters and receivers numbered A, E, and C on the same diagonal of the mounting panel 8, along with their corresponding laser irradiation points A', E', and C', are located in the same plane. The ultrasonic emission point F is also located in this plane. Let the distances from the laser emitters and receivers numbered A, E, and C to their corresponding laser irradiation points A', E', and C' be L1, L2, and L3, respectively. These three distances are measured by each laser emitter and receiver of the laser emitting device 3. The distance between each pair of the three laser emitters and receivers numbered A, E, and C is a constant, denoted as D, which can be directly measured. Then, the distance between each pair of laser irradiation points A', E', and C' can be calculated using the Pythagorean theorem. The distance between laser irradiation points A' and E' is... The distance between laser irradiation points E' and C' is Let the time differences between the same ultrasonic pulse received by laser irradiation points A', E', and C' from ultrasonic emission point F be TA', TE', and TC', respectively. Then, the propagation speeds of the ultrasonic transverse wave in concrete from laser irradiation point C' to E' and from laser irradiation point E' to A' are respectively... and Then, the average of the two speeds is taken to obtain the propagation speed of the ultrasonic transverse wave in the concrete. Then, the compressive strength of the concrete is corrected based on the propagation speed and the temperature and humidity of the site. This final process of using the propagation speed and the temperature and humidity of the site to determine the compressive strength of the concrete is the same as the method in Example 2, and will not be described in detail here.

[0074] In addition, in this embodiment, according to step S4, the mounting panel 8 is rotated so that the ultrasonic transmitter and the three laser transmitters and receivers located on the other diagonal of the square and the three corresponding laser irradiation points are located in the same plane. Then, according to step S5, the compressive strength value of the concrete is obtained and averaged with the value already obtained.

[0075] Example 5:

[0076] Based on Embodiment 1 or 3, the concrete strength testing device further includes a calibration plate 9. The calibration plate 9 can be configured as a square plate similar to the mounting panel 8. The front of the calibration plate 9 has five central cross markers 11 located at the four vertices and the center of the same square. The square formed by the positions of each central cross marker 11 corresponds to the square formed by the mounting positions of each laser emitter and receiver 1. Calibration plate adjustment screws 10 are respectively provided at the four corners of the back of the calibration plate 9. Horizontal and vertical calibration screws 2 are respectively provided on each of the laser emitters and receivers 1 in the horizontal and vertical directions. In this embodiment, both the calibration plate 9 and the laser emitting device 3 can be equipped with brackets or other devices to support the two instruments, facilitating operation.

[0077] During calibration, place the calibration plate 9 50m or 100m in front of the laser emitting device 3, using a wall as a reference. Ensure the laser emitting surface (i.e., the mounting panel) of the laser emitting device 3 is approximately perpendicular to the wall and ground. Five laser emitters and receivers 1 emit lasers. Align the central crosshair 11 of the calibration plate 9 with the central laser of the laser emitting device 3. Use the five laser emitters and receivers 1 to measure distances. Then, use the calibration plate adjustment screws 10 on the back of the calibration plate 9 to adjust the vertical and horizontal tilt angles of the calibration plate 9 so that the distances measured by the five laser emitters and receivers 1 are equal, indicating that the plane of the calibration plate is parallel to the laser emitting surface. The square side length and center distance of the calibration plate 9 are the same as those of the mounting panel 8. Check whether the four surrounding laser emitters coincide with the four central crosshairs 11 around the calibration plate 9. If not, adjust the horizontal and vertical calibration screws 2 of each laser emitter and receiver 1, or rotate the mounting panel 8 and adjust the horizontal and vertical calibration screws 2 of each laser emitter and receiver 1, so that the laser emitted by each laser emitter and receiver 1 coincides with its corresponding central crosshair 11. This completes the calibration of the laser emitting device 3.

Claims

1. A method for testing concrete strength testing device, wherein the concrete strength testing device includes a laser emitting device (3) and an ultrasonic emitting device (5) connected by communication. The laser emitting device (3) includes a laser emitting host (23) and an installation panel (8) set on the laser emitting host (23). Five laser emitting and receiving devices (1) are installed on the installation panel (8) respectively located at the four vertices and the center of the same square. The laser emitting host (23) includes a data processing device (12) and a timing device (15) set inside it. The timing device (15) and each laser emitting and receiving device (1) are respectively connected to the data processing device (12) through lines. The laser emitting host (23) is equipped with an electromagnetic wave receiver (4) connected to the data processing device (12) via a line, and the ultrasonic emitting device (5) is equipped with a radio wave transmitter (6). The electromagnetic wave receiver (4) and the radio wave transmitter (6) are connected in communication. characterized in that The detection method steps are as follows: S1. The five laser emitters and receivers (1) of the laser emitter (3) are aimed at the large-volume concrete part to be tested and five laser irradiation points are formed corresponding to the distribution of each laser emitter and receiver (1). At the same time, the timing signal of the timing device (15) is carried to the emitted laser. S2. The distances from the five laser emitters and receivers (1) to the concrete to be tested are measured by the laser emitting device (3), and the spatial angle between the concrete surface to be tested and the laser emitting surface is calculated. At the same time, the distance between the five laser irradiation points on the concrete surface and the angle between the lines connecting each laser irradiation point are calculated. S3. Ultrasonic waves are emitted from the lower surface of the large-volume concrete by an ultrasonic transmitter (5). Each time the ultrasonic transmitter (5) emits an ultrasonic pulse signal, the ultrasonic wave signal emitted by the ultrasonic transmitter (5) is transmitted to the laser transmitter (3). The laser transmitter (3) records the emission time of the ultrasonic pulse. S4. Using the laser emitting device (3), the time difference of the same ultrasonic wave reaching each laser irradiation point is calculated by the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point. The laser irradiation point at the center of the five laser irradiation points is taken as the origin of the coordinates of the concrete surface. The coordinate system of the concrete surface is established by taking the point closest to the ultrasonic emitting device (5) among the four surrounding laser irradiation points, i.e. the point with the smallest time difference, as the x-axis, and the coordinates of the other four laser irradiation points are calculated. S5. Using the transverse wave velocity of the ultrasonic wave in the concrete and the relative coordinates of the ultrasonic transmitter as unknowns, calculate the propagation speed of the ultrasonic transverse wave in the concrete using the distance between the five laser irradiation points, the angle between the lines connecting the five laser irradiation points, and the time difference of the same ultrasonic wave reaching each laser irradiation point. Then, correct the compressive strength of the concrete based on the propagation speed and the temperature and humidity at the site.

2. The method of claim 1, wherein: The concrete strength testing device also includes a calibration plate (9). The front of the calibration plate (9) is provided with five central cross marks (11) located at the four vertices and the center of the same square. The square formed by the position of each central cross mark (11) is consistent with the square formed by the installation position of each laser emitter and receiver (1). The four corners of the back of the calibration plate (9) are provided with calibration plate adjustment screws (10). Horizontal and vertical calibration screws (2) are provided on each of the laser emitters and receivers (1) in the horizontal and vertical directions respectively.

3. The method of claim 1, wherein: The laser emitting host (23) is equipped with a temperature sensor (16), a humidity sensor (17), a display device (14), and a data storage device (13), which are respectively connected to the data processing device (12).

4. The method of claim 1, wherein: The laser emitting device (3) and the ultrasonic emitting device (5) also include a first power supply (20) and a second power supply (21). The first power supply (20) is connected to the laser emitting host (23) and each laser emitting and receiving device (1). Each laser emitting and receiving device (1) is connected to a laser ranging button (19). The second power supply (21) is connected to the ultrasonic emitting device (5) and the radio wave transmitter (6). The ultrasonic emitting device (5) and the radio wave transmitter (6) are connected to ultrasonic and radio wave transmitting buttons (18).

5. A method for testing concrete strength testing device, wherein the concrete strength testing device includes a laser emitting device (3) and an ultrasonic emitting device (5) connected by communication. The laser emitting device (3) includes a laser emitting host (23) and an installation panel (8) set on the laser emitting host (23). Five laser emitting and receiving devices (1) are installed on the installation panel (8) respectively located at the four vertices and the center of the same square. The laser emitting host (23) includes a data processing device (12) and a timing device (15) set inside it. The timing device (15) and each laser emitting and receiving device (1) are respectively connected to the data processing device (12) through lines. The laser emitting host (23) is equipped with an electromagnetic wave receiver (4) connected to the data processing device (12) via a line, and the ultrasonic emitting device (5) is equipped with a radio wave transmitter (6). The electromagnetic wave receiver (4) and the radio wave transmitter (6) are connected in communication. The mounting panel (8) is rotatably mounted on the laser emitting host (23), and it can rotate around the laser emitting and receiving receiver (1) at the very center of the five laser emitting and receiving receivers (1); characterized in that The detection method steps are as follows: S1. The five laser emitters and receivers (1) of the laser emitter (3) are aimed at the large-volume concrete part to be tested and five laser irradiation points are formed corresponding to the distribution of each laser emitter and receiver (1). At the same time, the timing signal of the timing device (15) is carried to the emitted laser. S2. The distances from five laser emitters and receivers (1) to the concrete test site are measured using a laser emitting device (3); S3. Ultrasonic waves are emitted from the lower surface of the large-volume concrete by an ultrasonic transmitter (5). Each time the ultrasonic transmitter (5) emits an ultrasonic pulse signal, the ultrasonic wave signal emitted by the ultrasonic transmitter (5) is transmitted to the laser transmitter (3). The laser transmitter (3) records the emission time of the ultrasonic pulse. S4. The laser emitting device (3) calculates the time difference of the same ultrasonic pulse reaching each laser irradiation point by using the Doppler phase change of the laser reflection phase caused by ultrasonic vibration at each laser irradiation point. It judges whether the time difference of the same ultrasonic pulse reaching the laser irradiation point corresponding to the two laser emitters and receivers (1) located at the ends of one diagonal of the square is equal. If they are not equal, the mounting panel (8) is rotated to drive the laser emitters and receivers (1) located at the four vertices of the square to rotate. At the same time, the ultrasonic emitting device (5) is controlled to intermittently emit ultrasonic pulses and calculate the time difference of each ultrasonic pulse reaching each laser irradiation point until the time difference of the same ultrasonic pulse reaching the laser irradiation point corresponding to the two laser emitters and receivers (1) located at the ends of one diagonal of the square is equal. At this time, the three laser emitters and receivers (1) located on the other diagonal of the square and the three laser irradiation points corresponding to the three laser emitters and receivers (1) and the ultrasonic emitting device (5) are located in the same plane. S5. Calculate the distance between each two adjacent laser irradiation points based on the distance between the three laser irradiation points located in the same plane as the ultrasonic transmitter (5) and their corresponding laser transmitters and receivers (1) and the distance between each laser transmitter and receiver (1). Then, calculate the transverse wave velocity of the ultrasonic wave in the concrete based on the time difference of the same ultrasonic pulse reaching the above three laser irradiation points. Then, adjust the compressive strength of the concrete based on the propagation velocity combined with the temperature and humidity of the site.

6. The method of claim 5, wherein: Following step S4, continue rotating the mounting panel (8) so that the ultrasonic transmitter (5) and the three laser transmitters and receivers (1) located on the other diagonal of the square, as well as the three corresponding laser irradiation points of the three laser transmitters and receivers (1), are located in the same plane. Then, following step S5, the compressive strength value of the concrete is obtained and averaged with the value already obtained.

7. The method of claim 5, wherein: The laser emitting host (23) is provided with a rotating mechanism (32), and the mounting panel (8) is provided on the rotating mechanism (32). The rotating mechanism (32) includes a motor (33), a clockwise rotation button (34), and a counterclockwise rotation button (35) provided on the laser emitting host (23).

8. The method of claim 5, wherein: The concrete strength testing device also includes a calibration plate (9). The front of the calibration plate (9) is provided with five central cross marks (11) located at the four vertices and the center of the same square. The square formed by the position of each central cross mark (11) is consistent with the square formed by the installation position of each laser emitter and receiver (1). The four corners of the back of the calibration plate (9) are provided with calibration plate adjustment screws (10). Horizontal and vertical calibration screws (2) are provided on each of the laser emitters and receivers (1) in the horizontal and vertical directions respectively.

9. The method of claim 5, wherein: The laser emitting host (23) is equipped with a temperature sensor (16), a humidity sensor (17), a display device (14), and a data storage device (13), which are respectively connected to the data processing device (12).

10. The method of claim 5, wherein: The laser emitting device (3) and the ultrasonic emitting device (5) also include a first power supply (20) and a second power supply (21). The first power supply (20) is connected to the laser emitting host (23) and each laser emitting and receiving device (1). Each laser emitting and receiving device (1) is connected to a laser ranging button (19). The second power supply (21) is connected to the ultrasonic emitting device (5) and the radio wave transmitter (6). The ultrasonic emitting device (5) and the radio wave transmitter (6) are connected to ultrasonic and radio wave transmitting buttons (18).

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