Concrete strength detection system for engineering supervision and detection method thereof

Abstract

The invention relates to the technical field of concrete strength detection, and discloses a concrete strength detection system for engineering supervision and a detection method thereof, the concrete strength detection system for engineering supervision comprises: an adjustable resiliometer for obtaining resilience data under different impact energies at the same test point; the nonmetal ultrasonic detector is used for acquiring ultrasonic data of concrete; the data processing and analyzing end is used for processing and analyzing the springback data of each test point, judging the validity of the springback data according to a processing and analyzing result, and judging a concrete springback test result according to valid data in the springback data; the concrete strength state is judged according to the concrete rebound test result and the ultrasonic result; according to the invention, different grades of impact energy are adopted to carry out strength detection on the same test point, and the concrete rebound test result is judged according to effective data in the rebound data, so that the strength parameters of the concrete can be accurately obtained.

Description

Technical Field

[0001] The present application relates to the technical field of concrete strength detection, and in particular to a concrete strength detection system and detection method for engineering supervision. Background Art

[0002] In the process of engineering construction, concrete structure is the most widely used type of building structure. Due to the influence of building design and construction and disasters, the performance and durability of concrete structure are easily affected. According to the idea of ​​prevention first, it is necessary to test various parameters of concrete structure. Among them, the strength index of concrete has a more important impact on its performance and durability. Therefore, in the process of engineering supervision, the strength of concrete needs to be accurately tested to ensure that it meets the strength requirements.

[0003] There are many ways to test the strength of concrete, mainly including non-destructive testing and destructive testing. Non-destructive testing includes rebound method, ultrasonic testing method and electromagnetic method, and destructive testing includes standard test block compression test, core drilling method and pull-out method. Different methods are suitable for different demand scenarios. During the project supervision process, the rebound method and ultrasonic testing method are used for the testing process, which will not cause damage to the concrete structure and is convenient for testing operations.

[0004] Among the existing detection methods, the rebound method has the advantages of being fast, economical, and easy to operate, but it mainly tests the strength of the concrete surface and cannot judge the internal strength of the concrete. At the same time, during the detection process, each detection process of the rebound hammer will be affected by interference factors, and there is a risk of large errors in the detection results. Therefore, how to more accurately judge the strength state of concrete through the rebound method is the fundamental problem to be solved by the present invention. Summary of the Invention

[0005] In order to more accurately judge the strength state of concrete through the rebound method, the present application provides a concrete strength detection system and detection method for engineering supervision.

[0006] In a first aspect, the present application provides a concrete strength detection system for engineering supervision, which adopts the following technical solution:

[0007] A concrete strength detection system for engineering supervision, comprising:

[0008] Adjustable rebound hammer, used to obtain rebound data at different impact energies at the same test point;

[0009] Non-metallic ultrasonic detector, used to obtain ultrasonic data of concrete;

[0010] The data processing and analysis end is used to process and analyze the rebound data of each test point, judge the validity of the rebound data based on the processing and analysis results, and judge the concrete rebound test results based on the valid data in the rebound data; and judge the concrete strength status based on the concrete rebound test results and ultrasonic results.

[0011] By adopting the above technical solution, different levels of impact energy are used to perform strength testing on the same test point. The interference data in the rebound test process is eliminated through processing and analysis. The concrete rebound test results are judged based on the valid data in the rebound data. At the same time, combined with the ultrasonic data of the concrete, the strength parameters of the concrete can be accurately obtained.

[0012] Optionally, the process of processing and analyzing the rebound data by the data processing and analysis end includes:

[0013] Calculate the standard deviation Si of the rebound values ​​of all test points in the same test area at the same impact energy level, and compare the standard deviation Si corresponding to different impact energy levels to determine whether there is :

[0014] If it does not exist, all rebound data will be judged as valid data;

[0015] If it exists, determine the abnormal test point based on the rebound data of the i-th impact energy level relative to the rebound data of the other impact energy levels, and judge the abnormal test point under the impact energy level as invalid data;

[0016] in, is the correction coefficient for the i-th impact energy level, is a fixed error value.

[0017] By adopting the above technical solution, the correction coefficient is used to adjust the values ​​under different impact energy levels, so that the same standard can be maintained during the comparison, and then it can be determined whether there is When it does not exist, it means that the data obtained at different impact energy levels are relatively consistent, and all the rebound data are judged to be valid data; if it exists, it means that the rebound data of the i-th impact energy level is different from that of the other impact energy levels. The abnormal test point is determined according to the rebound data of the i-th impact energy level relative to the rebound data of the other impact energy levels, and the abnormal test point under the impact energy level is judged to be invalid data; through the above processing and analysis process, the validity of the rebound data obtained by the test can be judged, and by excluding the invalid data in the rebound data and then judging the strength of the concrete, the strength of the concrete can be judged more accurately.

[0018] Optionally, the process of determining abnormal test points includes:

[0019] Calculate the deviation value of each test point under the i-th impact energy level , where j is the serial number of the test point, is the rebound value of the jth test point under the i-th impact energy level;

[0020] exist When the preset deviation value is exceeded, the test point is judged as an invalid test point.

[0021] By adopting the above technical solution and through the process of determining abnormal test points, the strength of concrete can be judged more accurately by excluding invalid data in the rebound data.

[0022] Optionally, the process of judging the concrete rebound test result includes:

[0023] By formula Calculate the test rebound value of the jth test point ;

[0024] in, is the number of impact energy levels corresponding to the valid values ​​of the jth test point, i=1, 2, ..., .

[0025] By adopting the above technical solution, the remaining valid data after the invalid data can be comprehensively excluded, and the rebound test results can be judged as a whole, which reduces the impact of small errors in the test process on the test results, further improves the accuracy of the rebound test results, and thus improves the accuracy of the concrete strength test results.

[0026] Optionally, the ultrasonic data acquisition process of concrete includes:

[0027] Select m groups of ultrasonic intensities within the set range for output, and measure and obtain m groups of sound velocity results, where m ≥ 3;

[0028] Compare m groups of sound velocity results:

[0029] If the difference between the two largest groups of sound velocity results in m groups exceeds 3%, perform the equipment self-check procedure;

[0030] If the difference between the two largest groups of sound velocity results in m groups exceeds 1% but does not exceed 3%, the The sound velocity result corresponding to the maximum value is compared with the remaining sound velocity results, and this cycle is repeated until the difference between the two largest groups of sound velocity results in m groups does not exceed 1%. The lowest ultrasound intensity in the remaining groups is selected as the test ultrasound intensity;

[0031] If the difference between the two largest groups of sound velocity results in m groups does not exceed 1%, the lowest ultrasound intensity in m groups is selected as the test ultrasound intensity;

[0032] When testing the ultrasonic intensity, the test sound velocity of the concrete is obtained as ultrasonic data.

[0033] By adopting the above technical solution, the optimal ultrasonic intensity is obtained for detection by comparing the sound velocity results of m groups to ensure the accuracy of the detection results. When the numerical difference between the two largest groups of sound velocity results in m groups exceeds 3%, it means that the sound velocity difference under different ultrasonic intensities is too large, and it is necessary to check the status of the equipment, that is, to execute the equipment self-test program to determine whether the equipment is abnormal. If the numerical difference between the two largest groups of sound velocity results in m groups exceeds 1% but does not exceed 3%, it is necessary to select the optimal ultrasonic intensity in m groups, and first eliminate The sound velocity result corresponding to the maximum value is compared with the remaining sound velocity results, and this cycle is repeated until the numerical difference between the two largest groups in the m groups of sound velocity results does not exceed 1%. Therefore, the ultrasonic intensities of the remaining groups meet the requirements. On this basis, the lowest ultrasonic intensity in the remaining groups is selected as the test ultrasonic intensity, which can reduce the load of equipment operation and ensure the stability of equipment operation. In addition, when the numerical difference between the two largest groups in the m groups of sound velocity results does not exceed 1%, it means that the sound velocity results of all current groups meet the requirements, and the lowest ultrasonic intensity in the m groups is selected as the test ultrasonic intensity; the test sound velocity of concrete is obtained as ultrasonic data during the test ultrasonic intensity, which can ensure the accuracy of the measurement results while reducing the load of equipment operation.

[0034] Optionally, the process of judging the concrete strength state according to the concrete rebound test results and the ultrasonic results includes:

[0035] Input the test sound velocity into the sound velocity intensity regression equation to obtain the ultrasonic test intensity ;

[0036] Rebound test strength obtained based on concrete rebound test results ;

[0037] Comprehensive ultrasonic test strength and rebound test strength Determine the strength status of concrete.

[0038] By adopting the above technical solution, the ultrasonic test strength is obtained. and rebound test strength Combining the two to judge the concrete strength status can further improve the accuracy of concrete strength test results.

[0039] Optionally, the process of judging the concrete strength state according to the concrete rebound test results and the ultrasonic results further includes:

[0040] Ultrasonic test intensity at the same test point and rebound test strength Make a judgment:

[0041] like , then the concrete strength is ;

[0042] like , then execute the correction strategy, which includes re-measuring the carbonization depth and correcting the rebound value and re-testing the calibration equipment until ;

[0043] like , then the concrete strength is ;

[0044] Where Pt is the intensity error threshold, is the weight coefficient, 0< <1.

[0045] By adopting the above technical solution, the ultrasonic test intensity of the same test point is and rebound test strength Make a judgment, when If the concrete surface strength is higher than the internal strength and exceeds the error range, it means that there are stratification or local pores inside the concrete. Therefore, the strength result inside the concrete can be used as the judgment result to more accurately evaluate the strength condition of the concrete. , indicating that the internal strength of the concrete is higher than the surface strength and exceeds the error range. The main reason for this situation is insufficient surface carbonization correction or error and improper operation of the detection equipment. Therefore, by implementing the correction strategy, re-measure the carbonization depth and perform rebound value correction and re-test the calibration equipment until , thereby ensuring the validity of the test results; in addition When the concrete strength is , through comprehensive ultrasonic testing strength and rebound test strength As a result of the judgment, the strength condition of the concrete can be judged more accurately and comprehensively.

[0046] In a second aspect, the present application provides a method for detecting a concrete strength detection system for engineering supervision, which adopts the following technical solution:

[0047] A detection method of a concrete strength detection system for engineering supervision as described in any one of the above items comprises:

[0048] The rebound data of different impact energies at the same test point are obtained through an adjustable rebound hammer;

[0049] Acquire ultrasonic data of concrete through non-metallic ultrasonic detector;

[0050] The rebound data of each test point is processed and analyzed through the data processing and analysis terminal. The validity of the rebound data is judged based on the processing and analysis results. The concrete rebound test results are judged based on the valid data in the rebound data; the concrete strength status is judged based on the concrete rebound test results and ultrasonic results.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] The present invention uses different levels of impact energy to perform strength testing on the same test point, eliminates interference data in the rebound test process through processing and analysis, judges the concrete rebound test result based on valid data in the rebound data, and combines the ultrasonic data of the concrete to accurately obtain the strength parameters of the concrete; through the processing and analysis process of the rebound data of each test point, the validity of the rebound data obtained by the test can be judged, and by eliminating invalid data in the rebound data and then judging the strength of the concrete, the strength of the concrete can be judged more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a logic block diagram of a concrete strength testing system for engineering supervision.

[0054] Figure 2 The present invention is a flow chart of a concrete strength testing system testing method for engineering supervision. DETAILED DESCRIPTION

[0055] Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings.

[0056] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] The present application embodiment discloses a concrete strength detection system for engineering supervision, referring to Figure 1, including an adjustable rebound hammer, a non-metallic ultrasonic detector and a data processing and analysis end, wherein the adjustable rebound hammer includes a striking system, a rebound value measurement system and an energy adjustment and calibration component, etc. By adjusting the pressure spring in the energy adjustment and calibration component, the impact energy is adjusted. It should be noted that the adjustable range of the impact energy of the adjustable rebound hammer is within the standard range of the rebound detection method. Therefore, all test processes meet the standards. The rebound data under different impact energies at the same test point are obtained through the adjustable rebound hammer. The selection of specific impact energy levels can be adjusted according to the accuracy requirements of the test results. When the number of impact energy levels is more, the final accuracy result is higher. The rebound data of each test point is processed and analyzed by the data processing and analysis end, and the validity of the rebound data is judged according to the processing and analysis results, so that it can be eliminated. Interference data in the rebound test process is used to judge the concrete rebound test results based on the valid data in the rebound data, and the rebound data under different impact energies are integrated. The obtained results more accurately reflect the strength state of the concrete; in addition, the ultrasonic data of the concrete is obtained by a non-metallic ultrasonic detector, and the strength state of the concrete is judged based on the concrete rebound test results and the ultrasonic results. The test results of the two can be combined to make a comprehensive judgment on the concrete strength, thereby further improving the accuracy of the judgment of the concrete strength; in summary, this embodiment uses different levels of impact energy to perform strength detection on the same test point, eliminates the interference data in the rebound test process through processing and analysis, judges the concrete rebound test results based on the valid data in the rebound data, and combines the ultrasonic data of the concrete to accurately obtain the strength parameters of the concrete.

[0058] In one embodiment, a process for processing and analyzing rebound data at a data processing and analysis end is provided, including: calculating the standard deviation Si of the rebound values ​​of all test points at the same impact energy level in the same detection area, comparing the standard deviation Si corresponding to different impact energy levels, and if the rebound data are all valid data, the difference state of the rebound values ​​of the test points at different impact energy levels should be consistent. Since the results obtained under different impact energies are different, in order to maintain the consistency of the standard, a correction coefficient for each impact energy level is introduced. , correction factor The correction coefficient is determined by the ratio of the standard rebound value obtained by the corresponding impact energy level to the preset impact energy level. For example, if the preset impact energy level is 2.207 J, the rebound value of a point measured under the standard environment is A, while the current corresponding impact energy level is 2.107 J, and the rebound value of the same point measured under the standard environment is B. Therefore, the correction coefficient of the current corresponding impact energy level is A / B; through the correction factor Adjust the values ​​at different impact energy levels so that the same standards can be maintained during comparison. Then, determine whether there is ,in, is a fixed error value, which is set according to the error data fitting in the empirical data. When it does not exist, it means that the data obtained at different impact energy levels are relatively consistent, and then all the rebound data are judged to be valid data. If it exists, it means that the rebound data of the ith impact energy level is different from that of the other impact energy levels. The abnormal test point is determined according to the rebound data of the ith impact energy level relative to the rebound data of the other impact energy levels, and the abnormal test point under this impact energy level is judged as invalid data. Through the above processing and analysis process, the validity of the rebound data obtained by the test can be judged. By excluding the invalid data in the rebound data and then judging the strength of the concrete, the strength of the concrete can be judged more accurately.

[0059] The process of determining abnormal test points includes: calculating the deviation value of each test point under the i-th impact energy level , where j is the serial number of the test point, is the rebound value of the jth test point under the i-th impact energy level; the deviation value of each test point under the i-th impact energy level Compare with the preset deviation value, which is set according to the error data in the empirical data. Since the data of the same test point should maintain a high consistency, when the deviation value of each test point under the i-th impact energy level is When the error factor exceeds the limit, it means that the test result of the test point at the i-th impact energy level is seriously disturbed, resulting in abnormal values. When the preset deviation value is exceeded, the test point is judged as an invalid test point. Through the process of determining abnormal test points, the strength of concrete can be judged more accurately by excluding invalid data in the rebound data.

[0060] In one embodiment, the process of judging the concrete rebound test result includes: Calculate the test rebound value of the jth test point ;in, is the number of impact energy levels corresponding to the valid values ​​of the jth test point, i=1, 2, ..., Through the above calculation process, the remaining valid data after excluding invalid data can be comprehensively judged on the rebound test results, which reduces the impact of small errors in the test process on the test results, further improves the accuracy of the rebound test results, and thus improves the accuracy of the concrete strength test results.

[0061] In one embodiment, the ultrasonic data acquisition process for concrete includes: selecting m groups of ultrasonic intensities within a set range for output, and measuring and obtaining m groups of sound velocity results, where m ≥ 3. When testing the strength of concrete by ultrasound, the theoretical result (sound velocity) is determined by the elastic modulus, density, and internal structure of the material. However, in actual testing, if the ultrasonic intensity used for testing is too low, the ultrasonic signal will be severely attenuated when passing through the component, thereby increasing the sound time measurement error. When the ultrasonic intensity is too high, it may cause signal overload or reflection interference, which will also affect the measurement results. Therefore, this embodiment obtains m groups of sound velocity results, compares the m groups of sound velocity results, and then obtains the optimal ultrasonic intensity for testing to ensure the accuracy of the test results. When the difference between the values ​​of the two largest groups of m groups of sound velocity results exceeds 3%, it indicates that the sound velocity difference under different ultrasonic intensities is too large, and it is necessary to check the equipment status, that is, execute the equipment self-test program to determine whether the equipment is abnormal. If the difference between the values ​​of the two largest groups of m groups of sound velocity results exceeds 1% but does not exceed 3%, it is necessary to select the optimal ultrasonic intensity among the m groups, and first eliminate The sound velocity result corresponding to the maximum value is compared with the remaining sound velocity results, and this cycle is repeated until the numerical difference between the two largest groups in the m groups of sound velocity results does not exceed 1%. Therefore, the ultrasonic intensities of the remaining groups meet the requirements. On this basis, the lowest ultrasonic intensity in the remaining groups is selected as the test ultrasonic intensity, which can reduce the load of equipment operation and ensure the stability of equipment operation. In addition, when the numerical difference between the two largest groups in the m groups of sound velocity results does not exceed 1%, it means that the sound velocity results of all current groups meet the requirements, and the lowest ultrasonic intensity in the m groups is selected as the test ultrasonic intensity; the test sound velocity of concrete is obtained as ultrasonic data during the test ultrasonic intensity, which can ensure the accuracy of the measurement results while reducing the load of equipment operation.

[0062] In one embodiment, the process of judging the concrete strength state based on the concrete rebound test results and the ultrasonic results includes: inputting the test sound velocity into the sound velocity intensity regression equation to obtain the ultrasonic test intensity The sound velocity strength regression equation is obtained based on the concrete test data of the same batch or by looking up the table. This process belongs to the existing technology and will not be further described. The strength of the concrete is judged by the measured sound velocity results, and then the rebound test strength is obtained based on the concrete rebound test results. This process is obtained by comparing the corresponding relationship between the rebound amount and the test strength in the existing technology. It will not be described in detail here. Therefore, the ultrasonic test strength obtained is and rebound test strength Combining the two to judge the concrete strength status can further improve the accuracy of concrete strength test results.

[0063] In one embodiment, the process of judging the concrete strength state according to the concrete rebound test results and the ultrasonic test results further includes: and rebound test strength Pt is the intensity error threshold, which is set according to the error data fitting in the empirical data. When the concrete surface strength is higher than the internal strength, it exceeds the error range, indicating that there are stratification or local pores inside the concrete. Therefore, the strength result inside the concrete is used as the judgment result, that is, the concrete strength is judged to be , it is more accurate to evaluate the strength of concrete; if , indicating that the internal strength of the concrete is higher than the surface strength and exceeds the error range. The main reason for this situation is insufficient surface carbonization correction or error and improper operation of the detection equipment. Therefore, by implementing the correction strategy, re-measure the carbonization depth and perform rebound value correction and re-test the calibration equipment until , thereby ensuring the validity of the test results; in addition When the concrete strength is ,in, is the weight coefficient, 0< <1; it is adjusted according to the direction of test results. When the surface strength requirement is high, the weight coefficient is reduced. On the contrary, when the internal strength requirement is high, increase the weight coefficient , through comprehensive ultrasonic testing strength and rebound test strength As a result of the judgment, the strength condition of the concrete can be judged more accurately and comprehensively.

[0064] The present application also discloses a method for detecting the strength of concrete used in engineering supervision as described in any one of the above embodiments. Figure 2 The method includes: obtaining rebound data at different impact energies at the same test point using an adjustable rebound test hammer; obtaining ultrasonic data of concrete using a non-metallic ultrasonic detector; processing and analyzing the rebound data at each test point using a data processing and analysis terminal, determining the validity of the rebound data based on the processing and analysis results, and determining the concrete rebound test result based on the valid data in the rebound data; and determining the concrete strength status based on the concrete rebound test results and ultrasonic results. This embodiment uses different levels of impact energy to perform strength tests on the same test point, eliminates interference data during the rebound test through processing and analysis, determines the concrete rebound test result based on the valid data in the rebound data, and combines it with the concrete ultrasonic data to accurately obtain the concrete strength parameters.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A concrete strength detection system for engineering supervision, characterized in that: include: Adjustable rebound hammer, used to obtain rebound data at different impact energies at the same test point; Non-metallic ultrasonic detector, used to obtain ultrasonic data of concrete; The data processing and analysis end is used to process and analyze the rebound data of each test point, judge the validity of the rebound data based on the processing and analysis results, and judge the concrete rebound test results based on the valid data in the rebound data; The strength status of concrete is judged based on the concrete rebound test results and ultrasonic results.

2. A concrete strength detection system for engineering supervision according to claim 1, characterized in that: The process of processing and analyzing the rebound data by the data processing and analysis end includes: Calculate the standard deviation Si of the rebound values ​​of all test points in the same test area at the same impact energy level, and compare the standard deviation Si corresponding to different impact energy levels to determine whether there is : If it does not exist, all rebound data will be judged as valid data; If it exists, determine the abnormal test point based on the rebound data of the i-th impact energy level relative to the rebound data of the other impact energy levels, and judge the abnormal test point under the impact energy level as invalid data; in, is the correction coefficient for the i-th impact energy level, is a fixed error value.

3. A concrete strength detection system for engineering supervision according to claim 2, characterized in that: The process of determining abnormal test points includes: Calculate the deviation value of each test point under the i-th impact energy level , where j is the serial number of the test point, is the rebound value of the jth test point under the i-th impact energy level; exist When the preset deviation value is exceeded, the test point is judged as an invalid test point.

4. A concrete strength detection system for engineering supervision according to claim 3, characterized in that: The process of judging the results of concrete rebound test includes: By formula Calculate the test rebound value of the jth test point ; in, is the number of impact energy levels corresponding to the valid values ​​of the jth test point, i=1, 2, ..., .

5. A concrete strength detection system for engineering supervision according to claim 4, characterized in that: The ultrasonic data acquisition process for concrete includes: Select m groups of ultrasonic intensities within the set range for output, and measure and obtain m groups of sound velocity results, where m ≥ 3; Compare m groups of sound velocity results: If the difference between the two largest groups of sound velocity results in m groups exceeds 3%, perform the equipment self-check procedure; If the difference between the two largest groups of sound velocity results in m groups exceeds 1% but does not exceed 3%, the The sound velocity result corresponding to the maximum value is compared with the remaining sound velocity results, and this cycle is repeated until the difference between the two largest groups of sound velocity results in m groups does not exceed 1%. The lowest ultrasound intensity in the remaining groups is selected as the test ultrasound intensity; If the difference between the two largest groups of sound velocity results in m groups does not exceed 1%, the lowest ultrasound intensity in m groups is selected as the test ultrasound intensity; When testing the ultrasonic intensity, the test sound velocity of the concrete is obtained as ultrasonic data.

6. A concrete strength detection system for engineering supervision according to claim 5, characterized in that: The process of judging the concrete strength status based on the concrete rebound test results and ultrasonic results includes: Input the test sound velocity into the sound velocity intensity regression equation to obtain the ultrasonic test intensity ; Rebound test strength obtained based on concrete rebound test results ; Comprehensive ultrasonic test strength and rebound test strength Determine the strength status of concrete.

7. A concrete strength detection system for engineering supervision according to claim 6, characterized in that: The process of judging the concrete strength status based on the concrete rebound test results and ultrasonic results also includes: Ultrasonic test intensity at the same test point and rebound test strength Make a judgment: like , then the concrete strength is ; like , then execute the correction strategy, which includes re-measuring the carbonization depth and correcting the rebound value and re-testing the calibration equipment until ; like , then the concrete strength is ; Where Pt is the intensity error threshold, is the weight coefficient, 0< <1.

8. A detection method for a concrete strength detection system for engineering supervision according to any one of claims 1 to 7, characterized in that: include: The rebound data of different impact energies at the same test point are obtained through an adjustable rebound hammer; Acquire ultrasonic data of concrete through non-metallic ultrasonic detector; The rebound data of each test point is processed and analyzed by the data processing and analysis terminal, and the validity of the rebound data is judged based on the processing and analysis results. The concrete rebound test results are judged based on the valid data in the rebound data; The strength status of concrete is judged based on the concrete rebound test results and ultrasonic results.

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