Underwater pile foundation detection method, system and device and storage medium

Abstract

The invention discloses an underwater pile foundation detection method, system and device and a storage medium, relates to the technical field of pile foundation detection, and solves the technical problems that information of multiple key parameters cannot be effectively integrated, and a scientific and reasonable comprehensive evaluation method for accurately judging the overall state of a pile foundation is lacked. According to the method, multi-aspect parameters are comprehensively obtained and deeply analyzed, a complete pile foundation quality evaluation system is constructed, and after abnormal points are accurately positioned in a propagation velocity analysis link, the amplitude abrupt change, adjacent point difference discreteness and the abnormal area length proportion are synthesized by means of calculation and assignment of the velocity difference and the abnormal area length proportion and amplitude analysis, so that the quality of the pile foundation is evaluated. According to the method, the amplitude anomaly characteristics and range of a pile body are detected in an all-around mode, the local non-uniform defect detection precision is remarkably improved, in the frequency analysis process, frequency locking anomaly points are sent through comparison, regional analysis assignment is combined, the influence of the frequency locking anomaly points on the pile foundation quality is fully considered, and finally the pile foundation state value is calculated and matched with the state interval to generate information.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation detection, and in particular to an underwater pile foundation detection method, system, device and storage medium. Background Art

[0002] With the development of the national economy, more and more huge projects have emerged, including many large cross-sea bridges, water buildings, etc. These buildings are built on the water surface and supported by many underwater pile foundations, so the detection of underwater pile foundations is particularly important.

[0003] The patent with publication number CN109143246B discloses an underwater pile foundation detection method, which includes the following steps: an image data acquisition step: acquiring image data from a camera; a sonar data acquisition step: acquiring sonar data from a sonar; a data processing step: generating detection information based on the image data and the sonar data.

[0004] However, some existing underwater pile foundation detection methods are difficult to comprehensively and accurately evaluate the quality of underwater pile foundations when used. The analysis of ultrasonic parameters during the detection process is not systematic and comprehensive enough, and the information of multiple key parameters such as propagation speed, amplitude and frequency cannot be effectively integrated. There is a lack of scientific and reasonable comprehensive evaluation methods to accurately judge the overall status of the pile foundation. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an underwater pile foundation detection method, system, device and storage medium, which solves the problem of failure to effectively integrate information of multiple key parameters and lack of scientific and reasonable comprehensive evaluation methods to accurately judge the overall status of the pile foundation.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: an underwater pile foundation detection method, the method specifically comprises the following steps:

[0007] Step 1: Obtain ultrasonic parameters based on an ultrasonic detector with stable performance and high precision, and the acquired ultrasonic parameters include propagation time, frequency and amplitude;

[0008] Step 2: Calculate the propagation speed of the ultrasonic wave in the pile body based on the propagation time obtained at the detection point, and judge the overall state of the pile foundation according to the calculated propagation speed, and determine the corresponding abnormal area, and assign the sound wave value according to the abnormal area;

[0009] Step 3: Acquire the ultrasonic amplitudes of all detection points, and judge the change of the ultrasonic amplitudes. At the same time, acquire the corresponding amplitude abnormal area for the ultrasonic amplitudes with abnormal changes, and assign values ​​according to the amplitude abnormal area to obtain amplitude assignments;

[0010] Step 4: Analyze the sound wave frequencies corresponding to all detection points, determine the frequency abnormal points by comparing the emitted frequency and the received frequency, and determine the abnormal area of ​​the pile foundation according to the frequency abnormal points, and perform corresponding assignment to obtain the frequency assignment;

[0011] Step 5: The obtained sound wave value, amplitude value and frequency value are used to judge the overall state of the pile foundation, and the corresponding state information is generated by matching the calculated pile foundation value with the state judgment interval.

[0012] As a further solution of the present invention, the specific method of obtaining the sound wave assignment in step 2 is:

[0013] Obtain the propagation time of the ultrasonic wave at each detection point, and at the same time obtain the transmission distance corresponding to the detection point, then calculate the propagation speed of the ultrasonic wave in the pile body according to the obtained parameters, and similarly obtain the corresponding propagation speeds of all detection points and record them as Vi, where i=1, 2, ..., j, where j represents the number of detection points, and then judge the propagation speed Vi of different detection points i according to the position sequence of the detection points;

[0014] If the transmission speed Vi exceeds the normal range, it means that the corresponding detection point is abnormal, and the detection point is marked as an abnormal sound wave point. If the transmission speed Vi does not exceed the normal range, it means that the corresponding detection point is normal, and the detection point is marked as a normal sound wave point.

[0015] Then, all the abnormal sound wave points are obtained, and the propagation speed corresponding to the abnormal sound wave points is obtained, and the propagation speed difference corresponding to the abnormal sound wave points is calculated, and then the propagation speed difference is judged, and the abnormal sound wave points whose propagation speed difference is greater than the preset value are selected, and the corresponding abnormal area is obtained, and then the length of the abnormal area is obtained, and the length ratio of the abnormal area is calculated;

[0016] The calculated length ratio value is matched with the assignment interval, and the sound wave state corresponding to the abnormal area is assigned to obtain the sound wave assignment.

[0017] As a further solution of the present invention, the specific method of obtaining the amplitude assignment in step 3 is:

[0018] Get all the detection points i, and get the amplitude corresponding to the detection point i as Ai, then judge the amplitude Ai of the detection point i from top to bottom. If there is a sudden change in the amplitude Ai, get the detection point corresponding to the sudden change and record it as an abnormal amplitude point. If there is no sudden change in the amplitude Ai, it means that the pile foundation amplitude is normal.

[0019] Obtain the abnormal amplitude points obtained by analysis, and take the surface where the abnormal amplitude points are located as the reference surface, obtain different analysis points on the reference surface, and obtain the amplitudes corresponding to the analysis points, then calculate the amplitude difference of adjacent analysis points, and compare the calculated amplitude difference with the difference threshold, and screen the number of amplitude differences greater than the difference threshold, then calculate the corresponding number ratio, and judge the number ratio. If the number ratio is greater than the comparison value, it means that the amplitude difference is large in discreteness, and the corresponding amplitude abnormal area is obtained at the same time. On the contrary, if the number ratio is less than the comparison value, it means that the amplitude difference is small in discreteness, and the corresponding amplitude abnormal area is obtained in the same way;

[0020] Based on the obtained amplitude abnormal area, the length of the amplitude abnormal area is obtained, and the length ratio of the abnormal area is calculated. Then, the propagation speed is assigned and analyzed in the same way, and the corresponding amplitude assignment is obtained.

[0021] As a further solution of the present invention, the specific method of obtaining the frequency assignment in step 4 is:

[0022] Get all the detection points i, and at the same time, get the sound wave emission frequency corresponding to the detection point i and record it as F i, and get the sound wave receiving frequency corresponding to the detection point i and record it as F1 i, then calculate the frequency difference between the emission frequency and the receiving frequency and record it as Fc i, and compare the calculated frequency difference Fc i with the frequency threshold. If the frequency difference Fc i is greater than the frequency threshold, it means that the corresponding detection point i is abnormal, and the corresponding detection point is recorded as an abnormal frequency point. If the frequency difference Fc i is less than the frequency threshold, it means that the corresponding detection point i is not abnormal, and the corresponding detection point is recorded as a normal frequency point.

[0023] Then obtain all abnormal frequency points, and determine the corresponding abnormal area based on the abnormal frequency points, then obtain the length of the abnormal area, and calculate the length ratio of the abnormal area, and match and assign the frequency assignment according to the length ratio.

[0024] As a further solution of the present invention, the specific method of generating the status information in step 5 is:

[0025] The abnormal areas corresponding to the sound wave assignment, amplitude assignment and frequency assignment are recorded as S1, S2 and S3 respectively. Then, all the abnormal areas are judged by intersection, and the areas where the three areas intersect are selected as the areas to be analyzed. At the same time, the area length corresponding to the area to be analyzed is obtained and recorded as L. Then, the obtained parameters are substituted into the formula The pile foundation state value P is calculated, where w aIndicates the weight coefficients corresponding to the sound wave assignment, amplitude assignment and frequency assignment. The specific values ​​are set according to engineering experience and the importance of different assignments on the quality of pile foundation. a=1, 2, 3, respectively represent the sound wave assignment, amplitude assignment and frequency assignment;

[0026] The calculated pile foundation state value P is matched with the state judgment interval to obtain the corresponding matching result and generate state information.

[0027] An underwater pile foundation detection system includes an ultrasonic data acquisition unit, an ultrasonic data analysis unit, a comprehensive analysis unit and an information output unit;

[0028] An ultrasonic data acquisition unit, which is used to transmit the acquired ultrasonic parameters to the ultrasonic data analysis unit, and the ultrasonic parameters include the propagation speed, frequency and amplitude of the ultrasonic wave;

[0029] Ultrasonic data analysis unit, which always analyzes the acquired ultrasonic parameters, calculates the propagation speed of the ultrasonic wave in the pile body based on the propagation time acquired at the detection point, and judges the overall state of the pile foundation according to the calculated propagation speed, and determines the corresponding abnormal area at the same time, and assigns the sound wave value according to the abnormal area;

[0030] The ultrasonic amplitude of all detection points is obtained, and the change of the ultrasonic amplitude is judged. At the same time, the corresponding amplitude abnormal area is obtained for the ultrasonic amplitude with abnormal changes, and the amplitude value is assigned according to the amplitude abnormal area;

[0031] Analyze the sound wave frequencies corresponding to all detection points, determine the frequency abnormal points by comparing the emitted frequency and the received frequency, and determine the abnormal areas of the pile foundation according to the frequency abnormal points, and perform corresponding assignment to obtain the frequency assignment;

[0032] At the same time, the acquired sound wave value, amplitude value and frequency value are transmitted to the comprehensive analysis unit;

[0033] A comprehensive analysis unit, which is used to judge the overall state of the pile foundation based on the obtained sound wave value, amplitude value and frequency value, generate corresponding state information by matching the calculated pile foundation value with the state judgment interval, and transmit the state information to the information output unit;

[0034] An information output unit is used to display the acquired status information to the corresponding operator.

[0035] An underwater pile foundation detection device comprises an ultrasonic detector, an ultrasonic transducer, an acoustic detection tube and a controller;

[0036] The controller is used to execute the above-mentioned underwater pile foundation detection method.

[0037] A storage medium for underwater pile foundation detection, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned detection method can be implemented.

[0038] Beneficial Effects

[0039] The present invention provides an underwater pile foundation detection method, system, device and storage medium. Compared with the prior art, it has the following beneficial effects:

[0040] The present invention builds a complete pile foundation quality assessment system by comprehensively acquiring and deeply analyzing the parameters such as ultrasonic propagation time, frequency and amplitude. In the propagation speed analysis link, after accurately locating the abnormal point, the density change inside the pile body is precisely mapped by calculating and assigning the velocity difference and the abnormal area length ratio. In terms of amplitude analysis, the amplitude mutation, the discreteness of the difference between adjacent points and the abnormal area length ratio are comprehensively detected to detect the abnormal characteristics and range of the pile body amplitude, and the accuracy of local uneven defect detection is significantly improved. During frequency analysis, the abnormal point is locked by comparing the emitted frequency, and the regional analysis assignment is combined to fully consider its impact on the pile foundation quality. Finally, by making an intersection judgment on the abnormal area corresponding to the sound wave, amplitude, and frequency assignment, the pile foundation state value is calculated and the state interval generation information is matched, and the pile body quality category is accurately divided, covering Class I complete piles, Class II slightly defective piles, Class III obviously defective piles and Class IV seriously defective piles, providing a scientific and accurate method for underwater pile foundation quality assessment, effectively enhancing the reliability and effectiveness of the detection results, effectively ensuring the safety and stability of the project, and reducing the hidden dangers and maintenance costs caused by the pile foundation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a step method diagram of the present invention;

[0042] Figure 2 This is a block diagram of the system principle of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] For example, see Figure 1 The present application provides an underwater pile foundation detection method, which specifically comprises the following steps:

[0045] Step 1: Obtain ultrasonic parameters based on an ultrasonic detector with stable performance and high precision, and the acquired ultrasonic parameters include propagation time, frequency and amplitude. Specifically, the ultrasonic transducers are placed in two acoustic detection tubes respectively. Generally, the transducers are required to be able to rise and fall freely in the acoustic detection tubes. The distance between the transducers is determined according to the pile diameter. Usually, the initial spacing is about 20cm-30cm. During the detection process, the transducers are moved up or down synchronously according to a certain step distance (such as 10cm-20cm) to detect each section of the pile body.

[0046] Step 2: Calculate the propagation speed of the ultrasonic wave in the pile body based on the propagation time obtained at the detection point, and judge the overall state of the pile foundation according to the calculated propagation speed. At the same time, determine the corresponding abnormal area and assign the sound wave value according to the abnormal area.

[0047] Obtain the propagation time of the ultrasonic wave at each detection point, and at the same time obtain the transmission distance corresponding to the detection point, then calculate the propagation speed of the ultrasonic wave in the pile body according to the obtained parameters, and similarly obtain the corresponding propagation speeds of all detection points and record them as Vi, and i=1, 2, ..., j, where j represents the number of detection points, and the position of the detection point i is set from top to bottom of the pile body, and then judge the propagation speed Vi of different detection points i according to the position sequence of the detection points;

[0048] If the transmission speed Vi exceeds the normal range, it means that the corresponding detection point is abnormal, and the detection point is marked as a sound wave abnormal point. If the transmission speed Vi does not exceed the normal range, it means that the corresponding detection point is normal, and the detection point is marked as a sound wave normal point. The sound speed of normal concrete has a certain range. For example, the sound speed of C30 concrete is generally between 3500m / s-4500m / s. If it is not within this range, it indicates an abnormality.

[0049] Then, all the abnormal sound wave points are obtained, and the propagation speeds corresponding to the abnormal sound wave points are obtained, and the propagation speed differences corresponding to the abnormal sound wave points are calculated. Then, the propagation speed differences are judged, and the specific judgment method is to compare the propagation speed differences with the preset values, and select the abnormal sound wave points whose propagation speed differences are greater than the preset values, and obtain the corresponding abnormal areas, and then obtain the lengths of the abnormal areas, and calculate the length ratio of the abnormal areas.

[0050] The calculated length ratio value is matched with the assignment interval, and the specific value of the assignment interval is set by the operator, which is obtained by analyzing past historical data, and the sound wave state corresponding to the abnormal area is assigned to obtain the sound wave assignment.

[0051] For example, based on historical data, the operator divides the possible length ratio value range into different intervals and sets a corresponding sound wave value for each interval. For example, the set value interval is: when the length ratio value is between 0 and 0.1, the sound wave value is 1; when the length ratio value is between 0.1 and 0.2, the sound wave value is 2; when the length ratio value is between 0.2 and 0.3, the sound wave value is 3; when the length ratio value is greater than 0.3, the sound wave value is 4. For the length ratio value of 0.15 just calculated, its corresponding sound wave value is 2.

[0052] Step 3: Acquire the ultrasonic amplitude of all detection points, and judge the change of the ultrasonic amplitude. At the same time, obtain the corresponding amplitude abnormal area for the ultrasonic amplitude with abnormal change, and assign the amplitude value according to the amplitude abnormal area.

[0053] Get all the detection points i, and get the amplitude corresponding to the detection point i as Ai, then judge the amplitude Ai of the detection point i from top to bottom. If there is a sudden change in the amplitude Ai, get the detection point corresponding to the sudden change and record it as an abnormal amplitude point. If there is no sudden change in the amplitude Ai, it means that the pile foundation amplitude is normal.

[0054] The abnormal amplitude point obtained by analysis is obtained, and the surface where the abnormal amplitude point is located is used as the reference surface, and different analysis points on the reference surface are obtained, and the analysis point here is in the same plane as the abnormal amplitude point, and the amplitude corresponding to the analysis point is obtained, and then the amplitude difference of adjacent analysis points is calculated, and the calculated amplitude difference is compared with the difference threshold, and the specific value of the difference threshold here is set by the operator, and the number of amplitude differences greater than the difference threshold is screened, and then the corresponding number ratio is calculated, and the number ratio is judged at the same time. If the number ratio is greater than the comparison value, and the comparison value here is set by the operator, the comparison value here is 0.3, it means that the amplitude difference is large in discreteness, and the corresponding amplitude abnormal area is obtained at the same time. On the contrary, if the number ratio is less than the comparison value, it means that the amplitude difference is small in discreteness, and the corresponding amplitude abnormal area is obtained in the same way;

[0055] Based on the obtained amplitude abnormal area, the length of the amplitude abnormal area is obtained, and the length ratio of the abnormal area is calculated. Then, the propagation speed is assigned and analyzed in the same way, and the corresponding amplitude assignment is obtained.

[0056] An abnormal amplitude point was detected at a depth of 12 meters. Eight analysis points were selected on the plane where the point was located, and their amplitudes were [35dB, 45dB, 28dB, 50dB, 30dB, 40dB, 25dB, 38dB]. The amplitude difference of adjacent analysis points was calculated and compared with the set difference threshold of 10dB. It was found that there were 4 points with amplitude differences greater than the threshold, and the total number of adjacent analysis points was 7, with a number ratio of 4÷7≈0.57. Because 0.57>0.3, the amplitude difference is highly discrete, and the amplitude abnormal area is determined. The area accounts for 0.45 of the length along the circumference of the pile body on the plane at a depth of 12 meters. According to the set assignment interval (0-0.3 is assigned 1, 0.3-0.6 is assigned 2, and 0.6-1 is assigned 3), the corresponding amplitude assignment is 2.

[0057] Step 4: Analyze the sound wave frequencies corresponding to all detection points, determine the frequency anomaly points by comparing the emitted frequency and the received frequency, and determine the abnormal area of ​​the pile foundation based on the frequency anomaly points, and perform corresponding assignment to obtain the frequency assignment.

[0058] Obtain all detection points i, and at the same time obtain the sound wave emission frequency corresponding to the detection point i and record it as Fi, and obtain the sound wave receiving frequency corresponding to the detection point i and record it as F1 i, then calculate the frequency difference between the emission frequency and the receiving frequency and record it as Fci, and compare the calculated frequency difference Fci with the frequency threshold, and the specific value of the frequency threshold is set by the operator, generally within ±5%-±10%, for example, if the emission frequency is 100kHz, the receiving frequency may vary between 90kHz-110kHz, if the frequency difference Fci is greater than the frequency threshold, it means that the corresponding detection point i is abnormal, and the corresponding detection point is recorded as an abnormal frequency point, if the frequency difference Fci is less than the frequency threshold, it means that the corresponding detection point i is not abnormal, and the corresponding detection point is recorded as a normal frequency point;

[0059] Then obtain all the abnormal frequency points, and determine the corresponding abnormal area based on the abnormal frequency points, then obtain the length of the abnormal area, and calculate the length ratio of the abnormal area, and match and assign the frequency value according to the length ratio. The assignment method here is the same as the assignment method of the propagation speed and propagation amplitude.

[0060] Step 5: The obtained sound wave value, amplitude value and frequency value are used to judge the overall state of the pile foundation, and the corresponding state information is generated by matching the calculated pile foundation value with the state judgment interval.

[0061] The abnormal areas corresponding to the sound wave assignment, amplitude assignment and frequency assignment are recorded as S1, S2 and S3 respectively, where S1 represents the sound wave abnormal area, S2 represents the amplitude abnormal area, and S3 represents the frequency abnormal area. Then, all the abnormal areas are judged by intersection, and the area where the three have intersection is selected as the area to be analyzed. At the same time, the area length corresponding to the area to be analyzed is obtained and recorded as L. Then, the obtained parameters are substituted into the formula The pile foundation state value P is calculated, where w a Indicates the weight coefficients corresponding to the sound wave assignment, amplitude assignment and frequency assignment. The specific values ​​are set according to engineering experience and the importance of different assignments on the quality of pile foundation. a=1, 2, 3, respectively represent the sound wave assignment, amplitude assignment and frequency assignment;

[0062] The calculated pile foundation state value P is matched with the state judgment interval, and the numerical value corresponding to the state judgment interval is set by the operator to obtain the corresponding matching result and generate state information.

[0063] Specifically, based on the comprehensive evaluation of the above parameters, the pile quality is divided into the following categories:

[0064] Class I piles (intact pile body): Parameters such as sound velocity, amplitude and frequency are all within the normal range, and change smoothly along the depth direction of the pile body without obvious abnormalities.

[0065] Class II piles (with minor defects that do not affect the normal use of the piles): There are minor abnormalities in the local sound velocity, amplitude or frequency, but they do not exceed the specified limits. For example, the amplitude in a local area of ​​the pile body drops to 60%-70% of the normal amplitude, the sound velocity drops by no more than 10%, and other parameters are basically normal.

[0066] Class III piles (have obvious defects and need to be treated): When there are obvious abnormalities in parameters such as sound velocity, amplitude or frequency, such as the sound velocity drops by more than 10%-20%, the amplitude drops to 40%-60% of the normal amplitude, or the frequency drifts significantly.

[0067] Class IV piles (the pile body has serious defects, such as broken piles, and cannot be used): If there are serious abnormalities in parameters such as sound velocity, amplitude and frequency, such as a sharp drop in sound velocity (more than 20%), extremely low amplitude (less than 40% of the normal amplitude), and serious frequency drift or disordered spectrum components.

[0068] Each type of pile body mass corresponds to an interval value, and the specific interval value is calculated according to the specific maximum and minimum values ​​of the sound speed, amplitude and frequency, and the calculation method is the same as the above formula.

[0069] For example 2, please refer to Figure 2The present application provides an underwater pile foundation detection system, including: an ultrasonic data acquisition unit, an ultrasonic data analysis unit, a comprehensive analysis unit and an information output unit, and in combination with the attached Figure 2 It can be known that the above functional units are electrically connected in a unidirectional manner.

[0070] An ultrasonic data acquisition unit, which is used to transmit the acquired ultrasonic parameters to the ultrasonic data analysis unit, and the ultrasonic parameters include the propagation speed, frequency and amplitude of the ultrasonic wave;

[0071] An ultrasonic data analysis unit, which always analyzes the acquired ultrasonic parameters, calculates the propagation speed of the ultrasonic wave in the pile body based on the propagation time acquired at the detection point, and judges the overall state of the pile foundation according to the calculated propagation speed, and determines the corresponding abnormal area at the same time, and assigns the sound wave value according to the abnormal area, and the specific processing method is the same as the analysis method of step 2 in embodiment 1;

[0072] The ultrasonic amplitude of all detection points is obtained, and the change of the ultrasonic amplitude is judged. At the same time, the corresponding amplitude abnormal area is obtained for the ultrasonic amplitude with abnormal change, and the amplitude value is obtained according to the amplitude abnormal area. The specific processing method is the same as the analysis method of step three in embodiment one;

[0073] The sound wave frequencies corresponding to all detection points are analyzed, and the frequency abnormal points are determined by comparing the emitted frequency and the received frequency. At the same time, the abnormal area of ​​the pile foundation is determined according to the frequency abnormal points, and the corresponding assignment is performed to obtain the frequency assignment. The specific processing method is the same as the analysis method of step 4 in embodiment 1;

[0074] At the same time, the acquired sound wave value, amplitude value and frequency value are transmitted to the comprehensive analysis unit;

[0075] A comprehensive analysis unit, which is used to judge the overall state of the pile foundation based on the obtained sound wave value, amplitude value and frequency value, generate corresponding state information by calculating the pile foundation value and matching it with the state judgment interval, and transmit the state information to the information output unit, and the specific method of generating the state information is the same as the processing method of step 5 in embodiment 1;

[0076] An information output unit is used to display the acquired status information to the corresponding operator.

[0077] Embodiment 3, the present application provides an underwater pile foundation detection device, which specifically includes: an ultrasonic detector, which is used to measure the propagation time, amplitude, frequency and other parameters of the ultrasonic wave, and it is necessary to ensure that the instrument is calibrated, and its time measurement accuracy should generally reach about 0.1 μs, and the amplitude measurement accuracy should reach within 1%;

[0078] Ultrasonic transducer is used to realize the conversion between electrical signal and ultrasonic signal. Select the transducer with appropriate frequency according to the detection requirements. For underwater pile foundation detection, the commonly used frequency is generally between 50kHz-200kHz. The higher the frequency, the higher the resolution, but the propagation distance is relatively short; the lower the frequency, the longer the propagation distance, but the resolution will be reduced;

[0079] The sonic detection tube is used to facilitate the propagation of ultrasonic waves in the pile body. The material of the sonic detection tube is generally metal (such as steel pipe) or plastic (such as PVC pipe). It is required to have sufficient strength and sealing. The inner diameter of the sonic detection tube is usually 50mm-60mm. During installation, its position must be accurate. The parallelism error between the two sonic detection tubes should be less than 0.5%, and the inside of the sonic detection tube must be unobstructed and free of foreign matter. Before testing, the sonic detection tube needs to be cleaned and the debris in the tube needs to be flushed with clean water. If there is a blockage, a special unblocking tool can be used to clean it;

[0080] The controller is used to analyze the acquired parameters.

[0081] In a fourth embodiment, the present application provides a storage medium for an underwater pile foundation detection method, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned various method embodiments can be implemented.

[0082] Computer-readable media may include at least: any entity or device that can carry computer program codes to a device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electric carrier signal, a telecommunication signal, and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk, or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0083] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0084] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A method for detecting underwater pile foundation, characterized in that: The method specifically comprises the following steps: Step 1: Obtain ultrasonic parameters based on an ultrasonic detector with stable performance and high precision, and the acquired ultrasonic parameters include propagation time, frequency and amplitude; Step 2: Calculate the propagation speed of the ultrasonic wave in the pile body based on the propagation time obtained at the detection point, and judge the overall state of the pile foundation according to the calculated propagation speed, and determine the corresponding abnormal area, and assign the sound wave value according to the abnormal area; Step 3: Acquire the ultrasonic amplitudes of all detection points, and judge the change of the ultrasonic amplitudes. At the same time, acquire the corresponding amplitude abnormal area for the ultrasonic amplitudes with abnormal changes, and assign values ​​according to the amplitude abnormal area to obtain amplitude assignments; Step 4: Analyze the sound wave frequencies corresponding to all detection points, determine the frequency abnormal points by comparing the emitted frequency and the received frequency, and determine the abnormal area of ​​the pile foundation according to the frequency abnormal points, and perform corresponding assignment to obtain the frequency assignment; Step 5: The obtained sound wave value, amplitude value and frequency value are used to judge the overall state of the pile foundation, and the corresponding state information is generated by matching the calculated pile foundation value with the state judgment interval.

2. The underwater pile foundation detection method according to claim 1, characterized in that: The specific method of obtaining the sound wave assignment in step 2 is: Obtain the propagation time of the ultrasonic wave at each detection point, and at the same time obtain the transmission distance corresponding to the detection point, then calculate the propagation speed of the ultrasonic wave in the pile body according to the obtained parameters, and similarly obtain the corresponding propagation speeds of all detection points and record them as Vi, where i=1, 2, ..., j, where j represents the number of detection points, and then judge the propagation speed Vi of different detection points i according to the position sequence of the detection points; If the transmission speed Vi exceeds the normal range, it means that the corresponding detection point is abnormal, and the detection point is marked as an abnormal sound wave point. If the transmission speed Vi does not exceed the normal range, it means that the corresponding detection point is normal, and the detection point is marked as a normal sound wave point. Then, all the abnormal sound wave points are obtained, and the propagation speed corresponding to the abnormal sound wave points is obtained, and the propagation speed difference corresponding to the abnormal sound wave points is calculated, and then the propagation speed difference is judged, and the abnormal sound wave points whose propagation speed difference is greater than the preset value are selected, and the corresponding abnormal area is obtained, and then the length of the abnormal area is obtained, and the length ratio of the abnormal area is calculated; The calculated length ratio value is matched with the assignment interval, and the sound wave state corresponding to the abnormal area is assigned to obtain the sound wave assignment.

3. The underwater pile foundation detection method according to claim 1, characterized in that: The specific method of obtaining the amplitude assignment in step 3 is: Get all the detection points i, and get the amplitude corresponding to the detection point i as Ai, then judge the amplitude Ai of the detection point i from top to bottom. If there is a sudden change in the amplitude Ai, get the detection point corresponding to the sudden change and record it as an abnormal amplitude point. If there is no sudden change in the amplitude Ai, it means that the pile foundation amplitude is normal. Obtain the abnormal amplitude points obtained by analysis, and take the surface where the abnormal amplitude points are located as the reference surface, obtain different analysis points on the reference surface, and obtain the amplitudes corresponding to the analysis points, then calculate the amplitude difference of adjacent analysis points, and compare the calculated amplitude difference with the difference threshold, and screen the number of amplitude differences greater than the difference threshold, then calculate the corresponding number ratio, and judge the number ratio. If the number ratio is greater than the comparison value, it means that the amplitude difference is large in discreteness, and the corresponding amplitude abnormal area is obtained at the same time. On the contrary, if the number ratio is less than the comparison value, it means that the amplitude difference is small in discreteness, and the corresponding amplitude abnormal area is obtained in the same way; Based on the obtained amplitude abnormal area, the length of the amplitude abnormal area is obtained, and the length ratio of the abnormal area is calculated. Then, the propagation speed is assigned and analyzed in the same way, and the corresponding amplitude assignment is obtained.

4. The underwater pile foundation detection method according to claim 1, characterized in that: The specific method of obtaining the frequency assignment in step 4 is: Get all the detection points i, and at the same time get the sound wave emission frequency corresponding to the detection point i and record it as Fi, and get the sound wave receiving frequency corresponding to the detection point i and record it as F1 i, then calculate the frequency difference between the emission frequency and the receiving frequency and record it as Fci, and compare the calculated frequency difference Fci with the frequency threshold. If the frequency difference Fci is greater than the frequency threshold, it means that the corresponding detection point i is abnormal, and the corresponding detection point is recorded as an abnormal frequency point. If the frequency difference Fci is less than the frequency threshold, it means that the corresponding detection point i is not abnormal, and the corresponding detection point is recorded as a normal frequency point. Then obtain all abnormal frequency points, and determine the corresponding abnormal area based on the abnormal frequency points, then obtain the length of the abnormal area, and calculate the length ratio of the abnormal area, and match and assign the frequency assignment according to the length ratio.

5. The underwater pile foundation detection method according to claim 1, characterized in that: The specific method of generating the status information in step 5 is: The abnormal areas corresponding to the sound wave assignment, amplitude assignment and frequency assignment are recorded as S1, S2 and S3 respectively. Then, all the abnormal areas are judged by intersection, and the areas where the three areas intersect are selected as the areas to be analyzed. At the same time, the area length corresponding to the area to be analyzed is obtained and recorded as L. Then, the obtained parameters are substituted into the formula The pile foundation state value P is calculated, where w a Indicates the weight coefficients corresponding to the sound wave assignment, amplitude assignment and frequency assignment. The specific values ​​are set according to engineering experience and the importance of different assignments on the quality of pile foundation. a=1, 2, 3, respectively represent the sound wave assignment, amplitude assignment and frequency assignment; The calculated pile foundation state value P is matched with the state judgment interval to obtain the corresponding matching result and generate state information.

6. An underwater pile foundation detection system, used to execute an underwater pile foundation detection method according to any one of claims 1 to 5, characterized in that: It includes an ultrasonic data acquisition unit, an ultrasonic data analysis unit, a comprehensive analysis unit and an information output unit; An ultrasonic data acquisition unit, which is used to transmit the acquired ultrasonic parameters to the ultrasonic data analysis unit, and the ultrasonic parameters include the propagation speed, frequency and amplitude of the ultrasonic wave; Ultrasonic data analysis unit, which always analyzes the acquired ultrasonic parameters, calculates the propagation speed of the ultrasonic wave in the pile body based on the propagation time acquired at the detection point, and judges the overall state of the pile foundation according to the calculated propagation speed, and determines the corresponding abnormal area at the same time, and assigns the sound wave value according to the abnormal area; The ultrasonic amplitude of all detection points is obtained, and the change of the ultrasonic amplitude is judged. At the same time, the corresponding amplitude abnormal area is obtained for the ultrasonic amplitude with abnormal changes, and the amplitude value is assigned according to the amplitude abnormal area; Analyze the sound wave frequencies corresponding to all detection points, determine the frequency abnormal points by comparing the emitted frequency and the received frequency, and determine the abnormal areas of the pile foundation according to the frequency abnormal points, and perform corresponding assignment to obtain the frequency assignment; At the same time, the acquired sound wave value, amplitude value and frequency value are transmitted to the comprehensive analysis unit; A comprehensive analysis unit, which is used to judge the overall state of the pile foundation based on the obtained sound wave value, amplitude value and frequency value, generate corresponding state information by matching the calculated pile foundation value with the state judgment interval, and transmit the state information to the information output unit; An information output unit is used to display the acquired status information to the corresponding operator.

7. An underwater pile foundation detection device, characterized in that: It includes an ultrasonic detector, an ultrasonic transducer, an ultrasonic detection tube and a controller; The controller is used to execute an underwater pile foundation detection method as described in any one of claims 2 to 4.

8. An underwater pile foundation detection storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, it can implement the underwater pile foundation detection method described in any one of claims 2 to 4 above.

Images