A concrete strength detection method and device

Abstract

The present invention relates to the technical field of using ultrasonic testing materials, and specifically to a method and device for detecting concrete strength, which obtains ultrasonic calibration curves of various positions to be extended around the current extension position of the current initial position, and determines the ultrasonic calibration fluctuation of the ultrasonic calibration curve; selects the target position to be extended from each position to be extended according to the ultrasonic calibration fluctuation; determines whether the target position to be extended meets the extension condition, and if so, determines the target position to be extended as the next extension position of the current initial position; otherwise, takes the current extension position as the last extension position of the current initial position, and stops extending; takes the current initial position and its various extension positions as detection position points. The present invention effectively improves the accuracy of concrete strength detection by reasonably determining the detection position points.

Description

Technical Field

[0001] The invention relates to the technical field of utilizing ultrasonic testing materials, and in particular to a method and device for detecting concrete strength. Background Art

[0002] Concrete strength is an important indicator of concrete quality and is directly related to the safety and durability of concrete structures. There are many existing concrete strength testing methods, which are mainly divided into two categories: destructive testing and non-destructive testing. Among them, destructive testing such as compressive strength testing can provide the most direct strength data, but the operation is cumbersome and will damage the concrete structure; non-destructive testing such as rebound hammer method and ultrasonic testing method can provide fast and convenient testing methods without damaging the concrete structure, and has become the most important concrete strength testing method in concrete structure engineering.

[0003] In the process of using ultrasonic testing method to test the strength of concrete, the ultrasonic pulse velocity meter (Ultrasonic Pulse Velocity Tester) evaluates the strength of concrete by measuring the propagation speed of ultrasonic waves in concrete, thereby determining the internal defects and overall quality of concrete. However, in the process of using ultrasonic testing method to test the actual strength of concrete, since the concrete area is generally large, in order to improve the detection efficiency, some test positions are usually randomly selected for strength testing. Considering that defects such as gaps and voids in concrete will have a significant negative impact on the strength of concrete, especially void defects, these defects are caused by various reasons, including design defects, improper construction, etc. These defects will destroy the continuity of concrete, resulting in a decrease in its mechanical properties, thereby affecting the strength of concrete. Due to the uncertainty of the defect distribution position, randomly selecting some test positions cannot guarantee the rationality of the selected positions. When the defect positions such as cracks and voids that significantly affect the strength of concrete are not randomly selected, the strength test results will be inaccurate. Summary of the invention

[0004] The object of the present invention is to provide a concrete strength testing method and device, which is used to solve the problem that randomly extracting some testing positions during the existing concrete strength testing process will lead to unreasonable extracted testing positions, which will further lead to inaccurate concrete strength testing.

[0005] In order to solve the above technical problems, in a first aspect, the present invention provides a method for detecting concrete strength, comprising the following steps:

[0006] Obtaining ultrasound calibration curves of various positions to be extended around the current extended position of the current initial position;

[0007] Determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve according to the fluctuation characteristics of the ultrasonic calibration curve;

[0008] Filtering out a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation quantity;

[0009] Determine whether the target position to be extended satisfies an extension condition. If so, determine the target position to be extended as the next extension position of the current initial position; otherwise, determine the current extension position as the last extension position of the current initial position and stop extending.

[0010] The current initial position and its respective extended positions are used as detection position points.

[0011] In combination with the first aspect above, in some possible implementations, determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve includes:

[0012] Determining the slope value of each sampling point in the ultrasound calibration curve;

[0013] Determine the abnormality of the slope value of each sampling point in the ultrasonic calibration curve according to the slope value of each sampling point in the ultrasonic calibration curve and the difference in slope values ​​between adjacent sampling points;

[0014] The ultrasonic calibration fluctuation amount of the ultrasonic calibration curve is determined by comprehensively considering the overall distribution level of the slope value abnormality of all sampling points in the ultrasonic calibration curve.

[0015] In combination with the first aspect above, in some possible implementations, the step of determining each sampling point in the ultrasound calibration curve includes:

[0016] The ultrasound calibration curve is sampled using the Nyquist sampling method, with a sampling interval being half of the minimum positive period of the ultrasound calibration curve, thereby obtaining each sampling point in the ultrasound calibration curve.

[0017] In combination with the first aspect above, in some possible implementations, determining the abnormality of the slope value of each sampling point in the ultrasound calibration curve includes:

[0018] Normalizing the absolute value of the slope value of each sampling point in the ultrasonic calibration curve to obtain a slope normalization value;

[0019] Mapping the normalized slope value of each sampling point in the ultrasonic calibration curve to obtain a slope anomaly coefficient;

[0020] The slope abnormality difference index is obtained by comprehensively analyzing the difference in slope values ​​between each adjacent sampling point and the previous sampling point of each sampling point in the ultrasonic calibration curve;

[0021] According to the slope anomaly coefficient and the slope anomaly difference index of each sampling point in the ultrasonic calibration curve, the slope value anomaly of each sampling point in the ultrasonic calibration curve is obtained, and the slope anomaly coefficient and the slope anomaly difference index are both positively correlated with the slope value anomaly.

[0022] In combination with the first aspect above, in some possible implementations, screening out a target position to be extended from among the positions to be extended includes:

[0023] The position to be extended corresponding to the largest ultrasonic calibration fluctuation amount is determined as the target position to be extended.

[0024] In combination with the first aspect, in some possible implementations, determining whether the target to-be-extended position satisfies an extension condition includes:

[0025] Acquire an ultrasonic calibration fluctuation momentum sequence, wherein the ultrasonic calibration fluctuation momentum sequence is composed of ultrasonic calibration fluctuation momentums of ultrasonic calibration curves of the current initial position, the current extended position and all extended positions before it, and the target to-be-extended position of the current extended position;

[0026] Determining the probability of concrete abnormality according to the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence and the difference between adjacent ultrasonic calibration fluctuations;

[0027] If the concrete abnormality probability is less than the probability threshold, it is determined that the target position to be extended does not meet the extension condition; otherwise, it is determined that the target position to be extended meets the extension condition.

[0028] In combination with the first aspect, in some possible implementations, determining the probability of concrete abnormality includes:

[0029] Taking the difference between each ultrasonic calibration fluctuation momentum in the ultrasonic calibration fluctuation momentum sequence and its previous ultrasonic calibration fluctuation momentum as the input value of the sign function, and accumulating the output values ​​of the sign function corresponding to all ultrasonic calibration fluctuation momentums in the ultrasonic calibration fluctuation momentum sequence to obtain an output accumulated value;

[0030] The probability of concrete abnormality is determined according to the output accumulated value and the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence.

[0031] In combination with the first aspect above, in some possible implementations, the step of determining each to-be-extended position around the current extended position of the current initial position includes:

[0032] Determine the extension position points of the current extension position of the current initial position in each set extension direction, the distance from each extension position point to the current extension position is equal to the set distance value, and the angles formed by adjacent set extension directions are equal to the set angle;

[0033] The extension position points of the current extension position of the current initial position in each set extension direction are determined as each to-be-extended position around the current extension position of the current initial position.

[0034] In combination with the above first aspect, in some possible implementations, the method further includes: performing concrete strength testing at each of the testing locations.

[0035] In order to solve the above technical problems, in a second aspect, the present invention further provides a concrete strength detection device, the device comprising:

[0036] The curve acquisition module is used to: acquire the ultrasonic calibration curves of various positions to be extended around the current extension position of the current initial position;

[0037] An ultrasonic calibration fluctuation momentum acquisition module is used to: determine the ultrasonic calibration fluctuation momentum of the ultrasonic calibration curve according to the fluctuation characteristics of the ultrasonic calibration curve;

[0038] A target position to be extended obtaining module is used to: select a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation amount;

[0039] The extension judging module is used to judge whether the target position to be extended satisfies the extension condition. If the extension condition is satisfied, the target position to be extended is determined as the next extension position of the current initial position; otherwise, the current extension position is used as the last extension position of the current initial position and the extension is stopped;

[0040] The detection position point acquisition module is used to: use the current initial position and its respective extended positions as detection position points.

[0041] To solve the above technical problems, in a third aspect, the present invention further provides a concrete strength detection system, comprising a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, so that the device executes the method in the above first aspect or any possible implementation of the first aspect.

[0042] To solve the above technical problems, in a fourth aspect, the present invention further provides a computer program product, which includes: a computer program code, when the computer program code runs on a computer, enables the computer to execute the method in the above first aspect or any possible implementation of the first aspect.

[0043] To solve the above technical problems, in a fifth aspect, the present invention further provides a computer-readable storage medium, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above first aspect or any possible implementation of the first aspect.

[0044] The present invention has the following beneficial effects: by obtaining the ultrasonic calibration curves of various positions to be extended around the current extension position of the current initial position, and according to the fluctuation characteristics of the ultrasonic calibration curve, the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve caused by the concrete defect is determined, and then the target position to be extended in the defect extension direction is screened out, and then the extension position in the defect extension direction is determined by judging the extension conditions, and finally various detection position points are accurately obtained, which serves the purpose of defect positioning guidance, and while ensuring the efficiency of concrete strength detection, it also effectively improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A flowchart of a method for detecting concrete strength according to an embodiment of the present invention;

[0047] Figure 2 A flow chart of the steps of determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve according to an embodiment of the present invention;

[0048] Figure 3 It is a structural schematic diagram of a concrete strength detection device according to an embodiment of the present invention;

[0049] Figure 4 The figure is a schematic structural diagram of a concrete strength detection system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0051] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0052] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0053] Although operations or steps are described in a specific order in the drawings in the embodiments of the present invention, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or that all the operations or steps shown must be performed to obtain the desired results. In the embodiments of the present invention, these operations or steps may be performed in series; these operations or steps may also be performed in parallel; or some of these operations or steps may be performed.

[0054] At the same time, it is understood that the data involved in the technical solution of the present invention (including but not limited to the data itself, the acquisition or use of the data) shall comply with the requirements of the relevant laws, regulations and relevant provisions. Unless otherwise defined or clearly determined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by technicians in the technical field of the present invention, and all parameters or indicators in the formulas involved in the present invention are normalized values ​​that eliminate the influence of dimensions.

[0055] In order to solve the problem that randomly extracting some detection positions in the existing concrete strength detection process will lead to unreasonable extracted detection positions, which will further lead to inaccurate concrete strength detection, the embodiments of the present invention provide a concrete strength detection method and device, by determining the ultrasonic calibration curves of various positions to be extended around the current extended position of the current initial position of the concrete to be detected, the ultrasonic calibration fluctuation caused by the concrete defect is obtained, so as to determine the extended position in the defect extension direction, and finally accurately obtain each detection position point, which plays the purpose of defect positioning guidance, and effectively improves the detection accuracy while ensuring the efficiency of concrete strength detection.

[0056] A concrete strength detection method and device provided by an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] Figure 1FIG. 4 shows a basic flow chart of a concrete strength detection method provided by an embodiment of the present invention. Figure 1 As shown, the method specifically comprises the following steps:

[0058] Step S100: Acquire ultrasound calibration curves of various positions to be extended around the current extension position of the current initial position;

[0059] Step S200: determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve according to the fluctuation characteristics of the ultrasonic calibration curve;

[0060] Step S300: selecting a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation amount;

[0061] Step S400: determining whether the target position to be extended satisfies an extension condition; if so, determining the target position to be extended as the next extension position of the current initial position; otherwise, determining the current extension position as the last extension position of the current initial position and stopping the extension;

[0062] Step S500: taking the current initial position and its respective extended positions as detection position points.

[0063] Since the frequencies of cracks and voids in concrete are consistent, and voids will form stress concentration areas inside the concrete, this is because the voids cause the interruption of material continuity, causing the load to be redistributed on the surrounding materials. This uneven stress distribution can easily lead to cracks. Therefore, when cracks are detected, there is a high probability that there are voids in the direction of the crack extension, and the extension direction can be obtained by analyzing the ultrasonic calibration curve. The greater the fluctuation of the ultrasonic calibration curve, the wider or more random the cracks inside the concrete, and the greater the probability of the existence of voids, and the void defect detection direction can be determined accordingly.

[0064] Based on this logic, in the above steps, for the concrete to be tested, it is first necessary to obtain the initial position of each strength test, which can be determined randomly or by setting. Based on the initial position, the basic defect extension orientation, that is, each extension position, is determined, so as to obtain each test position point for each concrete strength test, and finally realize the strength test of the position of the void defect area, thereby improving the detection accuracy.

[0065] In the embodiment of the present invention, the geometric center of the concrete shape to be detected is first determined, and the geometric center is used as the initial position for the first strength detection, and the initial position is used as the current initial position, and the ultrasonic calibration curve of the current initial position is obtained, and the ultrasonic calibration fluctuation momentum of the ultrasonic calibration curve caused by the concrete defect is determined according to the fluctuation characteristics of the ultrasonic calibration curve. Then, the ultrasonic calibration curves of each position to be extended around the current initial position are obtained, and the ultrasonic calibration fluctuation momentum of each ultrasonic calibration curve is determined according to the fluctuation characteristics of each ultrasonic calibration curve. According to the ultrasonic calibration fluctuation momentum, the target position to be extended among the positions to be extended is screened out, and it is determined whether the target position to be extended meets the extension condition. If the extension condition is met, the target position to be extended is determined as the next extension position of the current initial position, and the next extension position is the position on the defect extension direction; otherwise, the extension is stopped. After determining the next extension position of the current initial position, the next extension position is used as the current extension position of the current initial position, and the ultrasonic calibration curves of each position to be extended around the current extension position are obtained, and the ultrasonic calibration fluctuation of each ultrasonic calibration curve is determined. According to the ultrasonic calibration fluctuation, the target position to be extended among the positions to be extended is screened out, and it is determined whether the target position to be extended meets the extension condition. If the extension condition is met, the target position to be extended is determined as the next extension position of the current initial position; otherwise, the current extension position is used as the last extension position of the current initial position, and the extension is stopped. The above process is repeated until the extension is stopped, thereby obtaining each extension position of the current initial position.

[0066] The current initial position and its various extended positions determined above are used as detection position points, and the ultrasonic detection method is used to perform concrete strength detection on each detection position point. Then, the minimum circumscribed rectangle of the current initial position and its various extended positions is determined, and the minimum circumscribed rectangle is removed from the concrete area to be detected. A position is randomly determined in the remaining area as the initial position for the second strength detection, and the initial position is used as the current initial position. In the same manner as above, the various extended positions of the current initial position are determined to obtain various detection position points, and the ultrasonic detection method is used to perform concrete strength detection on each detection position point. Then determine the minimum circumscribed rectangle of the current initial position and its various extended positions, remove the minimum circumscribed rectangle from the last remaining area, randomly determine a position in the new remaining area as the initial position for the third strength test, use the initial position as the current initial position, repeat the above steps, determine the initial position and its various extended positions for each strength test, thereby obtaining each detection position point for each strength test, and use ultrasonic detection method to perform concrete strength test on each detection position point until there is no remaining area in the concrete area to be tested, or the area ratio of the remaining area in the concrete area to be tested is less than the set ratio threshold, such as the set ratio threshold can be 0.01.

[0067] It should be understood that for any strength test, if the current initial position determined does not have an extended position, since the area of ​​the circumscribed rectangle of the initial position is small and can be ignored, a position is directly randomly determined in the remaining area corresponding to the last strength test as the initial position for the next strength test. In addition, in the process of determining each extended position of the current initial position, it is performed in the remaining area corresponding to the last strength test.

[0068] Of course, in other feasible methods, the concrete area to be tested can be evenly divided into blocks to obtain various block areas, and the geometric center of each block area is used as the initial position for each strength test, and the various extended positions of the initial position are determined in each block area.

[0069] The above method determines the initial position of each strength test and obtains the ultrasonic calibration fluctuation of the ultrasonic calibration curve of the initial position and each position to be extended around it. Based on the ultrasonic calibration fluctuation, the various extension positions of the defect extension guide are determined, and finally a suitable test position point is obtained. This avoids the problem of inaccurate strength test results when the void defect position that significantly affects the strength of concrete is not extracted when some test positions are randomly selected for strength test, thereby effectively improving the accuracy of concrete strength test.

[0070] The above steps S100 to S500 will be described in detail below in conjunction with the accompanying drawings. In an embodiment of the present invention, in order to obtain the ultrasonic calibration curves at various positions, it is necessary to first configure the detection equipment, and the configuration process includes: 1. Perform integrity detection on the ultrasonic pulse velocimeter and all its accessories (sensors, cables, batteries, etc.) to ensure that the ultrasonic pulse velocimeter and all its accessories are intact; 2. According to the specific type of ultrasonic pulse velocimeter, install the battery or connect the external power supply; 3. Connect the ultrasonic sensor (probe) to the host to ensure that the connection is firm, where the sensor configuration type is an undamped DPC sensor, configured as a 7×DPC transducer array, daisy wheel pattern; 4. Turn on Equipment, perform system self-check to ensure that the power supply, display, buttons, etc. are working properly; 5. Perform equipment calibration, use known speed standard reference values ​​to calibrate the equipment to ensure the accuracy of the measurement, speed standard reference value: the sound speed measurement range is 1000-15000m / s; 6. Set measurement parameters, set measurement mode and parameters according to the type of concrete and detection requirements, such as pulse frequency, gain, etc.; Among them, the pulse frequency setting reference range is: 50kHz; 7. Prepare and process the test surface, clean the concrete surface, and apply coupling agent when necessary to improve the contact quality between the sensor and the concrete. It should be noted that the above-mentioned process of configuring the detection equipment belongs to the preparation work of using an ultrasonic pulse velocimeter to detect the various positions to be extended around the current extension position of the current initial position to obtain the ultrasonic calibration curve. On the premise of ensuring that the ultrasonic calibration curve can be accurately obtained, this preparation work is not specifically limited here.

[0071] After the configuration of the detection equipment is completed, the initial position for each strength test is called the current initial position, and the ultrasonic pulse velocimeter is used to detect the current initial position, so as to obtain the ultrasonic calibration curve of the current initial position. The horizontal axis of the ultrasonic calibration curve represents the time (usually microseconds or milliseconds) for the ultrasonic wave to pass through the concrete at each position to be extended, which refers to the time required for the ultrasonic wave to propagate from the emission point to the receiving point; the vertical axis of the ultrasonic calibration curve represents the propagation speed of the ultrasonic wave in the concrete (usually in meters per second), which is calculated from the propagation time of the ultrasonic wave and the known propagation distance.

[0072] When using an ultrasonic pulse velocimeter to detect the current initial position, if the internal structure of the concrete is uniform and the density is consistent, the propagation speed of the ultrasonic wave should be relatively stable, so it will appear as a linear or stable change pattern on the ultrasonic calibration curve. In this case, the propagation of the ultrasonic wave in the concrete will be less disturbed and hindered, reflecting higher homogeneity and strength; on the contrary, if there are cracks, voids or other defects in the concrete, these discontinuities will cause the speed of the ultrasonic wave to change during propagation. For example, when the ultrasonic wave encounters a void, it will be reflected and refracted at the edge of the void, resulting in discontinuity in the propagation path and time. This discontinuity will appear as fluctuations or abnormal jumps on the ultrasonic calibration curve. These fluctuations are caused by the change of the ultrasonic wave speed in different media. Therefore, the changes in the ultrasonic calibration curve can reflect whether there are defects inside the concrete. Based on this, the fluctuation characteristics of the ultrasonic calibration curve are analyzed, the ultrasonic calibration fluctuation amplitude of the ultrasonic calibration curve is determined, and the size of the ultrasonic calibration fluctuation amplitude is used to reflect the defects inside the concrete.

[0073] In the embodiment of the present invention, Figure 2 As shown, determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve includes the following steps:

[0074] Determining the slope value of each sampling point in the ultrasound calibration curve;

[0075] Determine the abnormality of the slope value of each sampling point in the ultrasonic calibration curve according to the slope value of each sampling point in the ultrasonic calibration curve and the difference in slope values ​​between adjacent sampling points;

[0076] The ultrasonic calibration fluctuation amount of the ultrasonic calibration curve is determined by comprehensively considering the overall distribution level of the slope value abnormality of all sampling points in the ultrasonic calibration curve.

[0077] For the above steps, in the embodiment of the present invention, in order to reduce the amount of calculation, the minimum positive cycle of the ultrasound calibration curve is obtained. , and then the ultrasound calibration curve is sampled using the Nyquist sampling method, with a sampling interval of , so that each sampling point in the ultrasonic calibration curve can be obtained. Calculate the slope value of each sampling point in the ultrasonic calibration curve, and then calculate the slope value difference between each two adjacent sampling points. The slope value difference is the absolute value of the difference between the slope values ​​of each two adjacent sampling points. The size of the slope value reflects the speed of the curve change. When the curve changes more rapidly, the curve volatility is higher, indicating that the ultrasonic wave is more likely to encounter a cavity defect during propagation. This is because the ultrasonic wave will be reflected and refracted at the edge of the cavity, resulting in discontinuity in the propagation path and time. This discontinuity will appear as fluctuations or abnormal jumps on the ultrasonic calibration curve. The slope value difference between each two adjacent sampling points reflects the speed difference of the curve change between different sampling points. When the slope value difference between each adjacent sampling point of each sampling point in the ultrasonic calibration curve and its previous sampling point is greater, it also indicates that the curve changes more rapidly at the corresponding sampling point, and at this time, the ultrasonic wave is more likely to encounter defects during propagation.

[0078] Based on this, the absolute value of the slope value of each sampling point in the ultrasonic calibration curve is normalized to obtain the normalized slope value of each sampling point in the ultrasonic calibration curve. The method used for normalization can be reasonably selected according to needs. In the embodiment of the present invention, the absolute value of the slope value of each sampling point in the ultrasonic calibration curve is normalized by using the norm normalization function. The normalized slope value of each sampling point in the ultrasonic calibration curve is mapped to obtain the slope anomaly coefficient of each sampling point in the ultrasonic calibration curve. Determine each adjacent sampling point of each sampling point in each ultrasonic calibration curve, that is, take each sampling point in the ultrasonic calibration curve as the central sampling point, take a set number of m sampling points on the left and right of the central sampling, and take the central sampling point and its m sampling points on the left and right as the adjacent sampling points of the central sampling point. The value of the set number m can be reasonably set according to needs. In the embodiment of the present invention, the set number m=2 is set. The slope anomaly difference index is obtained by combining the slope value difference between each adjacent sampling point of each sampling point in the ultrasonic calibration curve and its previous sampling point. According to the slope anomaly coefficient and slope anomaly difference index of each sampling point in the ultrasonic calibration curve, the slope value anomaly of each sampling point in the ultrasonic calibration curve is obtained, and the slope anomaly coefficient and slope anomaly difference index are both positively correlated with the slope value anomaly.

[0079] In the embodiment of the present invention, the abnormality of the slope value of each sampling point in the ultrasound calibration curve is determined, and the corresponding calculation formula is:

[0080] ;

[0081] in, Indicates the first Sampling points Abnormality of the slope value; Indicates the first Sampling points The slope normalized value of ; Indicates the first Sampling points No. The absolute value of the difference in slope between adjacent sampling points and their previous sampling point, Indicates the first Sampling points The total number of adjacent sampling points, in this embodiment of the present invention, , m represents the set number.

[0082] In the above calculation formula, the first Sampling points The normalized slope value of the first Sampling points The slope anomaly coefficient is obtained by calculating the inverse of the difference between the normalized values ​​of the slope and the normalized values ​​of the slope. At the same time, by accumulating the ultrasonic calibration curve Sampling points The slope difference between each adjacent sampling point and the previous sampling point is used to obtain the slope anomaly difference index. When the slope anomaly coefficient and The larger the value of is, the greater the Sampling points The stronger the fluctuation of the curve change at , the greater the abnormality of the corresponding slope value, which reflects that the ultrasonic wave is more likely to encounter a cavity defect during the propagation process.

[0083] Since different sampling points in the ultrasonic calibration curve will show different slope value abnormalities, the slope value abnormalities of the sampling points are integrated to obtain the ultrasonic calibration fluctuation reflected by the ultrasonic calibration curve. The higher the slope value abnormality of the sampling point, the higher the ultrasonic calibration fluctuation of the ultrasonic calibration curve. In an embodiment of the present invention, the slope value abnormality of each sampling point in the ultrasonic calibration curve is normalized using the norm normalization function to obtain the normalized slope value abnormality, and the average of all normalized slope value abnormalities is calculated to obtain the ultrasonic calibration fluctuation of the ultrasonic calibration curve. The larger the ultrasonic calibration fluctuation, the greater the probability of the existence of cracks and voids in the concrete.

[0084] After determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve of the current initial position for each intensity detection in the above manner, the various positions to be extended around the current initial position are determined, that is, the extension position points of the current initial position in each set extension direction are determined, the distance from each extension position point to the current initial position is equal to the set distance value, and the angles formed by adjacent set extension directions are equal to the set angle, and the extension position points of the current initial position in each set extension direction are used as the various positions to be extended around the current initial position.

[0085] In an embodiment of the present invention, the horizontal rightward straight line direction passing through the current initial position is used as a set extension direction, and the horizontal rightward straight line direction is rotated counterclockwise, and a new set extension direction is obtained each time it is rotated 30°, thereby obtaining 12 set extension directions. Furthermore, an extension position point is determined in each of the 12 set extension directions, and the distance from each extension position point to the current initial position is equal to the set distance value. The value of the set distance value can be reasonably set as needed, and is not limited here. In an embodiment of the present invention, the set distance value is set to be equal to the radius of the effective detection range of the ultrasonic pulse velocimeter. The 12 extension position points in the 12 set extension directions are the various positions to be extended around the current initial position. Of course, in other achievable methods, the eight azimuth directions of the current initial position can also be directly used as the various set extension directions, and 8 extension position points are determined in the 8 set extension directions, and the 8 extension position points in the 8 set extension directions are the various positions to be extended around the current initial position.

[0086] An ultrasonic pulse velocimeter is used to detect each position to be extended at the current initial position, thereby obtaining an ultrasonic calibration curve of the position to be extended. In the same manner as the above-mentioned method of determining the ultrasonic calibration fluctuation momentum of the ultrasonic calibration curve of the current initial position, a fluctuation characteristic analysis is performed on the ultrasonic calibration curve of each position to be extended at the current initial position, thereby obtaining the ultrasonic calibration fluctuation momentum of the ultrasonic calibration curve of each position to be extended at the current initial position. The maximum value among the ultrasonic calibration fluctuation momentums of the ultrasonic calibration curves of the positions to be extended at the current initial position is determined, and the position to be extended corresponding to the maximum value is used as the target position to be extended of the current initial position.

[0087] Since the dynamic change characteristics of the ultrasonic calibration fluctuation can reflect the probability of occurrence of cracks and void defects, for example, when there are voids in the concrete, the cracks around it will be more common due to the uneven stress distribution, and the closer to the void area, the further the curve characteristics of the cracks will be amplified. At this time, during the continuous extension process, if there are voids, the ultrasonic calibration fluctuation will show a trend of continuous increase. On the contrary, if there are no voids, the ultrasonic calibration fluctuation will show a stable or slowly changing trend. Therefore, the dynamic change characteristics of the ultrasonic calibration fluctuation are analyzed to determine whether the target position to be extended meets the extension conditions, so as to determine whether to perform defect-guided extension.

[0088] In the embodiment of the present invention, an ultrasonic calibration fluctuation momentum sequence is constructed according to the ultrasonic calibration fluctuation momentum of the current initial position and the target position to be extended of the current initial position, that is, the ultrasonic calibration fluctuation momentum is arranged in sequence according to the order of obtaining the ultrasonic calibration fluctuation momentum before and after, so as to obtain an ultrasonic calibration fluctuation momentum sequence. Since only the current initial position and the target position to be extended among the positions to be extended around the current initial position are determined at this time, the ultrasonic calibration fluctuation momentum sequence obtained at this time has only two ultrasonic calibration fluctuation momentums. According to the number of ultrasonic calibration fluctuation momentums in the ultrasonic calibration fluctuation momentum sequence and the difference between adjacent ultrasonic calibration fluctuation momentums, the probability of concrete abnormality is determined, and based on the probability of concrete abnormality, it is determined whether the extension condition is met. If the extension condition is met, the target position to be extended is used as the first extension position of the current initial position. If the extension condition is not met, the extension is stopped. The process of determining the probability of concrete abnormality according to the number of ultrasonic calibration fluctuation momentums in the ultrasonic calibration fluctuation momentum sequence and the difference between adjacent ultrasonic calibration fluctuation momentums, and determining whether the extension condition is met based on the probability of concrete abnormality will be introduced in the following content, and will not be repeated here.

[0089] If the extension condition is met, after determining the first extension position of the current initial position, the first extension position is used as the current extension position, and then the ultrasonic calibration fluctuation amplitude of the ultrasonic calibration curve of each position to be extended around the current initial position is obtained in the same manner as above, and then the target position to be extended among the positions to be extended is screened out according to the ultrasonic calibration fluctuation amplitude. The ultrasonic calibration fluctuation amplitude of the ultrasonic calibration curve of each position to be extended around the current extension position can be determined, and then the target position to be extended among the positions to be extended is screened out according to the ultrasonic calibration fluctuation amplitude.

[0090] For the current extension position, an ultrasonic calibration fluctuation momentum sequence is constructed according to the ultrasonic calibration fluctuation momentum of the current initial position, the current extension position, and the target position to be extended of the current extension position, that is, the ultrasonic calibration fluctuation momentum is arranged in sequence according to the order of obtaining the ultrasonic calibration fluctuation momentum, so as to obtain an ultrasonic calibration fluctuation momentum sequence. Since only the current initial position, the current extension position (i.e., the first extension position), and the target position to be extended among the positions to be extended around the current extension position are determined at this time, the ultrasonic calibration fluctuation momentum sequence obtained at this time has only three ultrasonic calibration fluctuation momentums. According to the number of ultrasonic calibration fluctuation momentums in the ultrasonic calibration fluctuation momentum sequence and the difference between adjacent ultrasonic calibration fluctuation momentums, the probability of concrete abnormality is determined, and based on the probability of concrete abnormality, it is determined whether the extension condition is met. If the extension condition is met, the target position to be extended is used as the second extension position of the current initial position. If the extension condition is not met, the current extension position (i.e., the first extension position) is used as the last extension position, and the extension is stopped. The process of determining the probability of concrete abnormality according to the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence and the difference between adjacent ultrasonic calibration fluctuations, and determining whether the extension condition is met based on the concrete abnormality probability will be introduced in the following content and will not be repeated here.

[0091] If the extension condition is met, the second extension position of the current initial position is taken as the current extension position, and the above process is continuously repeated, so that the U-2 extension position of the current initial position can be determined, U>4, and the U-2 extension position is taken as the current extension position, and the ultrasonic calibration fluctuation of the ultrasonic calibration curve of each position to be extended around the current extension position can be determined, and then the target position to be extended among the positions to be extended can be screened out according to the ultrasonic calibration fluctuation. According to the ultrasonic calibration fluctuation of the ultrasonic calibration curve of the current initial position, the current extension position of the current initial position and all the extension positions before it, and the target position to be extended of the current extension position, an ultrasonic calibration fluctuation sequence is constructed, that is, the ultrasonic calibration fluctuation is arranged in sequence according to the order of obtaining the ultrasonic calibration fluctuation, so as to obtain an ultrasonic calibration fluctuation sequence. According to the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence and the difference between adjacent ultrasonic calibration fluctuations, the probability of concrete abnormality is determined, and whether the extension condition is met is determined based on the concrete abnormality probability. If the extension condition is met, the target position to be extended is taken as the next extension position of the current initial position. If the extension condition is not met, the current extension position is used as the last extension position of the current initial position and the extension is stopped.

[0092] In an embodiment of the present invention, when determining the probability of concrete abnormality based on the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation momentum sequence and the difference between adjacent ultrasonic calibration fluctuations, the difference between each ultrasonic calibration fluctuation momentum in the ultrasonic calibration fluctuation momentum sequence and its previous ultrasonic calibration fluctuation momentum is used as the input value of the sign function, and the output values ​​of the sign function corresponding to all ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation momentum sequence are accumulated to obtain an output accumulated value; the probability of concrete abnormality is determined based on the output accumulated value and the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation momentum sequence.

[0093] At this time, determine the probability of concrete abnormality, and the corresponding calculation formula is:

[0094] ;

[0095] in, represents the probability of concrete abnormality; represents the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence; represents a symbolic function; Indicates the first Ultrasonic calibration fluctuations; Indicates the first Ultrasonic calibration fluctuations.

[0096] In the above calculation formula, by analyzing the change of each ultrasonic calibration fluctuation relative to the previous ultrasonic calibration fluctuation in the ultrasonic calibration fluctuation sequence obtained during the defect extension process, when the value of the change is greater than 0, it means that the volatility of the ultrasonic calibration fluctuation increases. Since the ultrasonic calibration fluctuation will show an increasing trend if there is a void defect during the continuous extension process, all changes are accumulated. Ideally, the probability of concrete abnormality is On the contrary, if the ultrasonic calibration fluctuation shows a decreasing trend, the result of accumulation is , then the probability of concrete abnormality will be zero.

[0097] The larger the value of the concrete abnormal probability is, the more likely it is that there is a void defect in the extension direction. If there is a void defect, it is necessary to continue to extend. The smaller the value of the concrete abnormal probability is, the less likely it is that there is a hole defect in the extension direction, and there is no point in continuing to guide. Therefore, a probability threshold is set. In the embodiment of the present invention, the value of the probability threshold is set to , when the probability of concrete abnormality is less than If the extension condition is not met, the extension is stopped. Otherwise, the extension condition is met and the target position to be extended is used as the next extension position of the current initial position.

[0098] For each strength test, the above process is repeated until the extension is stopped, so that each extension position of the current initial position corresponding to the strength test can be obtained, and the current initial position corresponding to the strength test and its each extension position are used as the detection position point corresponding to the strength test, and the concrete strength test is performed on the detection position point. It should be understood that since the embodiment of the present invention focuses on obtaining a suitable detection position point, the specific process of performing concrete strength test on the detection position point can be reasonably selected according to needs, and is not limited here.

[0099] In an embodiment of the present invention, when testing the strength of concrete, an ultrasonic pulse velocimeter is placed at the testing location, the device is started, an ultrasonic calibration curve is obtained, and data analysis is performed based on the propagation time and velocity of each point on the ultrasonic calibration curve to obtain the change in ultrasonic velocity. Then, parameter data reflecting the quality of concrete, such as the relationship between wave velocity and strength, is calculated using specific software or formulas. The data difference between normal concrete areas and abnormal areas is compared to assess possible strength loss or structural problems. Finally, a concrete strength test report is generated, which includes data charts, analysis conclusions, and any recommended further inspection or repair measures. The report should record in detail the test location, date, environmental conditions, and equipment model and settings used.

[0100] Based on the same inventive concept, the embodiment of the present invention also provides a concrete strength detection device, such as Figure 3 As shown, the device comprises:

[0101] The curve acquisition module is used to: acquire the ultrasonic calibration curves of various positions to be extended around the current extension position of the current initial position;

[0102] An ultrasonic calibration fluctuation momentum acquisition module is used to: determine the ultrasonic calibration fluctuation momentum of the ultrasonic calibration curve according to the fluctuation characteristics of the ultrasonic calibration curve;

[0103] A target position to be extended obtaining module is used to: select a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation amount;

[0104] The extension judging module is used to judge whether the target position to be extended satisfies the extension condition. If the extension condition is satisfied, the target position to be extended is determined as the next extension position of the current initial position; otherwise, the current extension position is used as the last extension position of the current initial position and the extension is stopped;

[0105] The detection position point acquisition module is used to: use the current initial position and its respective extended positions as detection position points.

[0106] It should be noted that: the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual application, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device is divided into different functional modules to complete all or part of the functions described above. In addition, the concrete strength detection method embodiment provided in the above embodiment belongs to the same concept, and its specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0107] Based on the same inventive concept, the embodiment of the present invention also provides a concrete strength detection system, such as Figure 4 As shown, the control system includes: a memory 101, a processor 102, and a computer program 103 stored in the memory 101 and running on the processor 102, wherein when the processor 102 executes the computer program 103, the system can execute any one of the concrete strength detection methods introduced above.

[0108] The embodiment of the present invention can divide the system into functional modules according to the above method example. For example, each functional module can be corresponded to, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0109] Based on the same inventive concept, an embodiment of the present invention further provides a computer program product, which includes: a computer program code, when the computer program code runs on a computer, the computer executes any one of the concrete strength detection methods introduced above.

[0110] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program code. When the computer program code runs on a computer, the computer executes any one of the concrete strength detection methods described above.

[0111] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for detecting concrete strength, characterized in that: The following steps are involved: Acquire ultrasonic calibration curves of various positions to be extended around the current extended position of the current initial position; Determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve according to the fluctuation characteristics of the ultrasonic calibration curve; Filtering out a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation quantity; Determine whether the target position to be extended satisfies an extension condition. If so, determine the target position to be extended as the next extension position of the current initial position; otherwise, determine the current extension position as the last extension position of the current initial position and stop extending. Taking the current initial position and each extended position thereof as detection position points; Determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve includes: Determining the slope value of each sampling point in the ultrasound calibration curve; Determine the abnormality of the slope value of each sampling point in the ultrasonic calibration curve according to the slope value of each sampling point in the ultrasonic calibration curve and the difference in slope values ​​between adjacent sampling points; Determine the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve by comprehensively analyzing the overall distribution level of the slope value abnormality of all sampling points in the ultrasonic calibration curve; The steps of determining each sampling point in the ultrasonic calibration curve include: The ultrasonic calibration curve is sampled using the Nyquist sampling method, with the sampling interval being half of the minimum positive period of the ultrasonic calibration curve, thereby obtaining each sampling point in the ultrasonic calibration curve; Determining the abnormality of the slope value of each sampling point in the ultrasound calibration curve includes: Normalizing the absolute value of the slope value of each sampling point in the ultrasonic calibration curve to obtain a slope normalization value; Mapping the normalized slope value of each sampling point in the ultrasonic calibration curve to obtain a slope anomaly coefficient; The slope abnormality difference index is obtained by comprehensively analyzing the difference in slope values ​​between each adjacent sampling point and the previous sampling point of each sampling point in the ultrasonic calibration curve; According to the slope anomaly coefficient and slope anomaly difference index of each sampling point in the ultrasonic calibration curve, the slope value anomaly of each sampling point in the ultrasonic calibration curve is obtained, and the slope anomaly coefficient and slope anomaly difference index are both positively correlated with the slope value anomaly Screening out a target position to be extended from among the positions to be extended includes: The position to be extended corresponding to the maximum ultrasonic calibration fluctuation amount is determined as the target position to be extended.

2. A method for detecting concrete strength according to claim 1, characterized in that: Determining whether the target position to be extended meets the extension condition includes: Acquire an ultrasonic calibration fluctuation momentum sequence, wherein the ultrasonic calibration fluctuation momentum sequence is composed of ultrasonic calibration fluctuation momentums of ultrasonic calibration curves of the current initial position, the current extended position and all extended positions before it, and the target to-be-extended position of the current extended position; Determining the probability of concrete abnormality according to the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence and the difference between adjacent ultrasonic calibration fluctuations; If the concrete abnormality probability is less than the probability threshold, it is determined that the target position to be extended does not meet the extension condition; otherwise, it is determined that the target position to be extended meets the extension condition.

3. A concrete strength detection method according to claim 2, characterized in that: Determine the probability of concrete anomaly, including: Taking the difference between each ultrasonic calibration fluctuation momentum in the ultrasonic calibration fluctuation momentum sequence and its previous ultrasonic calibration fluctuation momentum as the input value of the sign function, and accumulating the output values ​​of the sign function corresponding to all ultrasonic calibration fluctuation momentums in the ultrasonic calibration fluctuation momentum sequence to obtain an output accumulated value; The probability of concrete abnormality is determined according to the output accumulated value and the number of ultrasonic calibration fluctuations in the ultrasonic calibration fluctuation sequence.

4. A method for detecting concrete strength according to claim 1, characterized in that: The step of determining each to-be-extended position around the current extended position of the current initial position includes: Determine the extension position points of the current extension position of the current initial position in each set extension direction, the distance from each extension position point to the current extension position is equal to the set distance value, and the angles formed by adjacent set extension directions are equal to the set angle; The extension position points of the current extension position of the current initial position in each set extension direction are determined as each to-be-extended position around the current extension position of the current initial position.

5. A concrete strength detection method according to claim 1, characterized in that: The method further comprises: performing concrete strength testing at each of the testing locations.

6. A concrete strength detection device, characterized in that: The device comprises: The curve acquisition module is used to: acquire the ultrasonic calibration curves of various positions to be extended around the current extension position of the current initial position; An ultrasound calibration fluctuation momentum acquisition module is used to: determine the ultrasound calibration fluctuation momentum of the ultrasound calibration curve according to the fluctuation characteristics of the ultrasound calibration curve; A target position to be extended obtaining module is used to: select a target position to be extended from among the positions to be extended according to the ultrasonic calibration fluctuation amount; The extension judging module is used to judge whether the target position to be extended satisfies the extension condition. If the extension condition is satisfied, the target position to be extended is determined as the next extension position of the current initial position; otherwise, the current extension position is used as the last extension position of the current initial position and the extension is stopped; A detection position point acquisition module is used to: use the current initial position and each extended position thereof as detection position points; Determining the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve includes: Determining the slope value of each sampling point in the ultrasound calibration curve; Determine the abnormality of the slope value of each sampling point in the ultrasonic calibration curve according to the slope value of each sampling point in the ultrasonic calibration curve and the difference in slope values ​​between adjacent sampling points; Determine the ultrasonic calibration fluctuation amount of the ultrasonic calibration curve by comprehensively analyzing the overall distribution level of the slope value abnormality of all sampling points in the ultrasonic calibration curve; The steps of determining each sampling point in the ultrasonic calibration curve include: The ultrasonic calibration curve is sampled using the Nyquist sampling method, with the sampling interval being half of the minimum positive period of the ultrasonic calibration curve, thereby obtaining each sampling point in the ultrasonic calibration curve; Determining the abnormality of the slope value of each sampling point in the ultrasound calibration curve includes: Normalizing the absolute value of the slope value of each sampling point in the ultrasonic calibration curve to obtain a slope normalization value; Mapping the normalized slope value of each sampling point in the ultrasonic calibration curve to obtain a slope anomaly coefficient; The slope abnormality difference index is obtained by comprehensively analyzing the difference in slope values ​​between each adjacent sampling point and the previous sampling point of each sampling point in the ultrasonic calibration curve; According to the slope anomaly coefficient and slope anomaly difference index of each sampling point in the ultrasonic calibration curve, the slope value anomaly of each sampling point in the ultrasonic calibration curve is obtained, and the slope anomaly coefficient and slope anomaly difference index are both positively correlated with the slope value anomaly Screening out a target position to be extended from among the positions to be extended includes: The position to be extended corresponding to the maximum ultrasonic calibration fluctuation amount is determined as the target position to be extended.

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