Method, device and system for detecting defects in prestressed anchor holes of bridges

Abstract

The present invention provides a method, device and system for detecting defects in the hole of a prestressed anchor of a bridge. The array eddy current probe is arranged in a fitting relationship with the inner surface of the target hole of the prestressed anchor of the bridge to ensure that the array eddy current probe fits the inner surface of the target hole, thereby eliminating the influence of the lift-off of the array eddy current probe on the defect signal. At the same time, the influence of the variable aperture characteristics of the hole of the prestressed anchor of the bridge on the detection signal is also considered. Through further signal processing, the defect detection result is made more accurate and the detection accuracy is also improved. Compared with other detection methods such as x-ray, magnetic powder, ultrasonic phased array, etc., this method has significant advantages such as no pollution, no need for coupling agent, and high detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of nondestructive testing, and in particular to a method, device and system for detecting defects in a prestressed anchor hole of a bridge. Background Art

[0002] Eddy current nondestructive testing technology is usually used in the construction industry such as aircraft, ships, automobiles and large mechanical parts inspection. The eddy current nondestructive testing process is that when an AC excitation signal is applied to the coil, an alternating magnetic field is generated around the coil and in the conductive medium. According to Faraday's law of electromagnetic induction, a vortex-shaped electric field will be generated in the conductive medium, and then a vortex-shaped current, namely eddy current, will be formed. The strength of the eddy current is closely related to the properties of the conductive medium, and the existence of eddy current will also cause changes in the magnetic field in space. Generally, by measuring the changes in the magnetic field through magnetic field sensors such as coils and Hall, various information about the conductive medium can be obtained, such as conductivity, magnetic permeability, thickness, and whether the medium has defects such as corrosion and cracks.

[0003] Prestressed anchors for bridges are permanent anchoring devices used in prestressed concrete for bridges. They are widely used in highway bridges, railway bridges, urban interchanges, light rails, etc. As they need to withstand the huge tensile force of prestressed tendons during use, comprehensive non-destructive testing of anchor defects is required before use to ensure the safety of the main structure of the building.

[0004] Therefore, there is an urgent need to provide a method for detecting defects in the holes of prestressed anchors of bridges. Summary of the invention

[0005] The present invention provides a method, device and system for detecting defects in a prestressed anchor hole of a bridge, which are used to solve the defects in the prior art.

[0006] The present invention provides a method for detecting defects in a prestressed anchor hole of a beam, comprising:

[0007] Based on a rotatable array eddy current probe arranged in a target hole of a bridge prestressed anchor, a circumferential detection signal of each channel in the target hole is determined; the array eddy current probe is provided with a row of grooves along the length direction, a detection coil is installed in each groove, and each detection coil corresponds to a channel;

[0008] Based on the circumferential detection signals of each channel, defect detection is performed on the inner wall of the target hole.

[0009] According to a method for detecting defects in a prestressed anchor hole of a bridge provided by the present invention, the inner wall of the target hole is subjected to defect detection based on the circumferential detection signal of each channel, comprising:

[0010] Based on the signal adjustment coefficient of each channel, the circumference detection signal of each channel is adjusted to obtain the target circumference detection signal of each channel;

[0011] Based on the target circumference detection signal of each channel, the inner wall of the target hole is inspected for defects.

[0012] According to a method for detecting defects in a prestressed anchor hole of a bridge provided by the present invention, the inner wall of the target hole is subjected to defect detection based on a target circumference detection signal of each channel, comprising:

[0013] Displaying the target circumference detection signal of each channel according to the groove position where the corresponding detection coil is installed and the range length corresponding to the aperture of the target hole, respectively, to obtain display curves corresponding to the target circumference detection signals of the multiple channels;

[0014] If there is a target channel and there is a defect signal in the display curve corresponding to the target circumference detection signal of the target channel, it is determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed.

[0015] According to a method for detecting defects in a prestressed anchor hole of a bridge provided by the present invention, the method for determining the signal adjustment coefficient includes:

[0016] Determining the radial distance between every two grooves on the array eddy current probe;

[0017] Based on the radial distance, a signal adjustment coefficient of a channel corresponding to each groove is determined.

[0018] According to a method for detecting defects in a prestressed anchor hole of a bridge provided by the present invention, the method for determining the signal adjustment coefficient further includes:

[0019] Based on the array eddy current probe arranged in the sample target hole of the sample bridge prestressed anchor without defects, determine the sample sensing signal of each channel in the sample target hole;

[0020] Based on the sample sensing signal of each channel, a signal adjustment coefficient of each channel is determined to make the sample sensing signal of each channel be at the same level.

[0021] According to a method for detecting defects in a bridge prestressed anchor hole provided by the present invention, a rotatable array eddy current probe arranged in a target hole of the bridge prestressed anchor is used to determine a circumferential detection signal of each channel in the target hole, including:

[0022] The array eddy current probe is rotated along the central axis of the target hole for one circle, and the induction signals output by each detection coil obtained by multiple samplings are recorded;

[0023] For any detection coil, each sampling corresponding to the detection coil is numbered in ascending order, and a corresponding relationship between the number of each sampling and the induction signal output by the detection coil is determined;

[0024] Determine the total number of sampling times, and update the middle position label of each sampling in the corresponding relationship to 0, and update the other labels except the middle position label to the difference between half of the total number of sampling times to obtain the circumferential detection signal of the channel corresponding to any detection coil.

[0025] The present invention also provides a device for detecting defects in a prestressed anchor hole of a bridge, comprising:

[0026] A signal determination module is used to determine the circumferential detection signal of each channel in the target hole based on a rotatable array eddy current probe arranged in a close fit in the target hole of the bridge prestressed anchor; the array eddy current probe is provided with a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel;

[0027] The defect detection module is used to perform defect detection on the inner wall of the target hole based on the circumferential detection signal of each channel.

[0028] The present invention also provides a bridge prestressed anchor hole defect detection system, comprising: the bridge prestressed anchor hole defect detection device mentioned above, and an array eddy current probe;

[0029] The defect detection device in the bridge prestressed anchor hole is connected to the detection coils installed in the grooves of the array eddy current probe.

[0030] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-described methods for detecting defects in the hole of a prestressed anchor of a bridge are implemented.

[0031] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described methods for detecting defects in a prestressed anchor hole of a bridge.

[0032] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for detecting defects in the holes of prestressed anchors of bridges.

[0033] The method, device and system for detecting defects in the hole of a prestressed anchor of a bridge provided by the present invention not only reduce the influence of the distance between the array eddy current probe and the inner surface of the target hole of the prestressed anchor of the bridge on the defect detection, but also take into account the variable aperture characteristics of the prestressed anchor of the bridge, so that the defect detection result is more accurate. Compared with ultrasonic phased array detection, there is no need to introduce additional materials such as coupling agent, which can greatly improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0035] Figure 1 It is one of the flow diagrams of the method for detecting defects in the prestressed anchor hole of a bridge provided by the present invention;

[0036] Figure 2 is a schematic diagram of a portion of the array eddy current probe provided by the present invention being inserted into a target hole;

[0037] Figure 3 This is one of the structural schematic diagrams of the array eddy current probe provided by the present invention;

[0038] Figure 4 This is the second structural schematic diagram of the array eddy current probe provided by the present invention;

[0039] Figure 5 It is a schematic diagram of the measuring range lengths of different channels provided by the present invention;

[0040] Figure 6 is a schematic diagram of the radial distance between two grooves provided by the present invention;

[0041] Figure 7 This is the second flow chart of the method for detecting defects in a prestressed anchor hole of a bridge provided by the present invention;

[0042] Figure 8 It is a structural schematic diagram of a device for detecting defects in a prestressed anchor hole of a bridge provided by the present invention;

[0043] Fig. 9 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0045] The prestressed anchor of a bridge is a permanent anchoring device used in the prestressed concrete of a bridge. It needs to withstand huge prestressed tendon tension during use and is a key component related to the safety of the bridge structure. Since the prestressed anchor of a bridge is prone to cracks in the hole, the commonly used detection methods are magnetic powder, x-ray and ultrasonic phased array detection, but the above detection methods have the disadvantages of environmental pollution, the need for coupling agents, and low detection efficiency; and the existing eddy current detection has the problem of low detection accuracy and efficiency due to the variable aperture characteristics of the prestressed anchor hole of the bridge, and the probe cannot fit the inspected area well. A method for detecting defects in the hole of a prestressed anchor of a bridge is provided in an embodiment of the present invention to detect defects in the hole of a prestressed anchor of a bridge.

[0046] Figure 1 FIG. 1 is a flow chart of a method for detecting defects in a prestressed anchor hole of a bridge provided in an embodiment of the present invention, such as Figure 1 As shown, the method includes:

[0047] S1, based on a rotatable array eddy current probe arranged in a target hole of a bridge prestressed anchor, determining a circumferential detection signal of each channel in the target hole; the array eddy current probe has a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel;

[0048] S2, based on the circumference detection signal of each channel, performing defect detection on the inner wall of the target hole.

[0049] Specifically, the method for detecting defects in the hole of a prestressed anchor of a bridge provided in an embodiment of the present invention is implemented by a single chip microcomputer, which can be controlled by a host computer or a hardware circuit. The single chip microcomputer can be connected to an oscilloscope to display the circumference detection signal.

[0050] First, step S1 is performed to determine the circumferential detection signal of each channel in the target hole through a rotatable array eddy current probe arranged in a fit in the target hole of the bridge prestressed anchor. The bridge prestressed anchor may include multiple identical holes, each of which can be used as a target hole for hole defect detection.

[0051] Each hole on the bridge prestressed anchor has a variable aperture characteristic, and the cross section along the length direction is usually a trapezoidal shape that is wide at the top and narrow at the bottom. The shape of the array eddy current probe matches the shape of the target hole, so that the array eddy current probe can fit closely with the inner surface of the target hole when inserted into the target hole. Figure 2 The figure shows the schematic diagram of the array eddy current probe partially inserted into the target hole. Figure 2 In the figure, 1 is an array eddy current probe, 2 is a bridge prestressed anchor, and the bridge prestressed anchor 2 includes two holes. Each hole can be used as a target hole in turn, and the array eddy current probe can be inserted into the target hole to realize defect detection of each hole.

[0052] like Figure 3 As shown, the array eddy current probe 1 may include a probe body 11 and a raised handle 12 provided on the probe body 11. The probe body 11 may be a variable diameter cylinder, and the cross section along the length direction may be a trapezoid. The variable diameter cylinder may be hollow or solid. The raised handle 12 may be used by the user to perform operations such as lifting, rotating, etc.

[0053] The length of the probe body 11 may be the same as the depth of the target hole, so that when the array eddy current probe is inserted into the target hole, it can fit the entire inner surface of the target hole from top to bottom.

[0054] like Figure 4 As shown, the array eddy current probe 1 has a row of grooves 13 along the length direction, and the number of grooves can be set as needed, for example, 8 grooves can be set. The cross section of the groove 13 along the depth direction can be trapezoidal or rectangular. Each groove 13 is used to install a detection coil.

[0055] The opening area formed by each groove 13 on the outer surface of the array eddy current probe 1 is the same, so as to ensure that the detection coil installed in each groove 13 has the same detection area and detection strength during detection, thereby improving the accuracy of defect detection.

[0056] In each groove 13, a detection coil is installed, and each detection coil corresponds to a channel. The detection coil can be a self-excited and self-receiving eddy current detection coil, and can be a rigid rectangular coil. The detection coil can be wound with copper wire, and the size of the detection coil can be: 3mm long, 2mm wide, and 0.5mm thick. The detection coil has two wires leading out, which can be connected to the excitation signal, and the induced signal can also be derived through the wire to the single-chip microcomputer for processing. The excitation signal can be a current signal, and the induced signal can be a voltage signal.

[0057] The circumferential detection signal refers to the collection of induction signals at various circumferential positions recorded by rotating the array eddy current probe along the central axis of the target hole for one circle.

[0058] In the embodiment of the present invention, the set of induction signals obtained by each detection coil can be directly used as the circumferential detection signal of each channel, or the induction signal obtained by each detection coil can be preprocessed to obtain the circumferential detection signal of each channel respectively, which is not specifically limited here.

[0059] Then, step S2 is executed to perform defect detection on the inner wall of the target hole in combination with the circumferential detection signals of each channel. Here, since each channel corresponds to a circumferential detection area, the circumferential detection signal of each channel can be judged separately. It is possible to directly judge whether there is a defect in the circumferential detection area corresponding to the channel by observing whether there is an abnormal defect signal in the waveform curve of the circumferential detection signal of each channel, or it is possible to first normalize the circumferential detection signal of each channel, and then judge whether there is a defect in the circumferential detection area corresponding to the channel by whether there is an abnormal defect signal in the waveform curve of the normalized result.

[0060] The method for detecting defects in the hole of a prestressed anchor of a bridge provided in an embodiment of the present invention ensures that the array eddy current probe fits the inner surface of the target hole of the prestressed anchor of the bridge, by fitting the array eddy current probe with the inner surface of the target hole, thereby eliminating the influence of the lift-off of the array eddy current probe on the defect signal. At the same time, the influence of the variable aperture characteristics of the hole of the prestressed anchor of the bridge on the detection signal is also considered, and the defect detection results are made more accurate and the detection accuracy is improved through further signal processing. Compared with other detection methods such as x-ray, magnetic powder, ultrasonic phased array, etc., this method has significant advantages such as no pollution, no need for coupling agent, and high detection efficiency.

[0061] On the basis of the above-mentioned embodiment, the method for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, wherein the inner wall of the target hole is subjected to defect detection based on the circumferential detection signal of each channel, comprises:

[0062] Based on the signal adjustment coefficient of each channel, the circumference detection signal of each channel is adjusted to obtain the target circumference detection signal of each channel;

[0063] Based on the target circumference detection signal of each channel, the inner wall of the target hole is inspected for defects.

[0064] Specifically, due to the change in the aperture of the bridge prestressed anchor, the curvature of the circumferential detection area corresponding to each groove changes, thereby affecting the identification of the defect signal in the circumferential detection signal. To this end, in an embodiment of the present invention, when the inner wall of the target hole is defect-detected, the circumferential detection signal of each channel is first adjusted according to the signal adjustment coefficient of each channel to obtain the target circumferential detection signal of each channel. The signal adjustment coefficient of each channel can be determined according to the material of the bridge prestressed anchor, and can be a predetermined constant used to eliminate the differences in the circumferential detection signal caused by different channel positions, that is, the signal adjustment coefficient of each channel is used to balance the differences in the induction signals caused by the different curvatures of the corresponding groove positions of each channel when there are no defects in the target hole. The adjustment process can be regarded as a process of normalizing the circumferential detection signal of each channel, and the adjustment method can be to directly multiply the signal adjustment coefficient of each channel by the circumferential detection signal, and the product result is the target circumferential detection signal of each channel.

[0065] Furthermore, defect detection can be performed on the inner wall of the target hole based on the target circumferential detection signal of each channel, that is, whether there is an abnormal defect signal in the waveform curve of the target circumferential detection signal of each channel, it can be judged whether there is a defect in the circumferential detection area corresponding to the channel.

[0066] In an embodiment of the present invention, the circumferential detection signal of each channel is adjusted through the signal adjustment coefficient of each channel, which can eliminate the differences in the circumferential detection signal caused by different channel positions, and then eliminate the judgment of the defect signal due to the differences, thereby improving the accuracy of the defect detection results.

[0067] On the basis of the above-mentioned embodiment, the method for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, wherein the inner wall of the target hole is subjected to defect detection based on the target circumference detection signal of each channel, comprises:

[0068] Displaying the target circumference detection signal of each channel according to the groove position where the corresponding detection coil is installed and the range length corresponding to the aperture of the target hole, respectively, to obtain display curves corresponding to the target circumference detection signals of the multiple channels;

[0069] If there is a target channel and there is a defect signal in the display curve corresponding to the target circumference detection signal of the target channel, it is determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed.

[0070] Specifically, in the embodiment of the present invention, when performing defect detection on the inner wall of the target hole, the target circumference detection signal of each channel can be first displayed according to the groove position where the corresponding detection coil is installed, with the range length corresponding to the aperture of the target hole, that is, the position order of the display curve corresponding to the target circumference detection signal of each channel is the same as the groove position order corresponding to each channel, and the range length order corresponding to the target circumference detection signal of each channel is the same as the aperture order of the target hole corresponding to each channel. Then, the range length of all channels gradually decreases from top to bottom, such as Figure 5 The figure shows the range length of different channels.

[0071] On this basis, if there is a target channel, and there is a defect signal in the display curve corresponding to the target circumferential detection signal of the target channel, that is, there is an abnormality in the display curve, then it can be determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed. The number of defects is the same as the number of defect signals. For example, if there are two defect signals in the display curve, it is determined that there are two defects in the circumferential detection area corresponding to the target channel. Since the range length of all channels gradually decreases from top to bottom, it allows users to more intuitively observe where the defective circumferential detection area appears on the inner surface of the target hole.

[0072] On the basis of the above-mentioned embodiment, in the method for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, the method for determining the signal adjustment coefficient includes:

[0073] Determining the radial distance between every two grooves on the array eddy current probe;

[0074] Based on the radial distance, a signal adjustment coefficient of a channel corresponding to each groove is determined.

[0075] Specifically, in the embodiment of the present invention, when determining the signal adjustment coefficient, the radial distance between every two grooves on the array eddy current probe can be determined first. Figure 6 As shown, let the straight-line distances between the two different grooves and the large aperture of the target hole be X1 and X2 respectively, the radius of the large aperture of the target hole be R, the radius of the small aperture of the target hole be r, and the depth of the target hole be h. Then the radial distance between the two different grooves is:

[0076]

[0077] The large aperture of the target hole refers to the maximum aperture of the target hole, and the small aperture of the target hole refers to the minimum aperture of the target hole.

[0078] Then, the signal adjustment coefficient of each channel can be determined according to the radial distance between two different grooves. Here, the channel corresponding to the large aperture of the target hole can be used as a standard, and the signal adjustment coefficient of each channel can be determined according to the radial distance between the grooves corresponding to other channels and the groove corresponding to the large aperture of the target hole. It can be understood that the signal adjustment coefficient can be a proportional value less than 1.

[0079] On the basis of the above-mentioned embodiment, the method for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, the method for determining the signal adjustment coefficient further includes:

[0080] Based on the array eddy current probe arranged in the sample target hole of the sample bridge prestressed anchor without defects, determine the sample sensing signal of each channel in the sample target hole;

[0081] Based on the sample sensing signal of each channel, a signal adjustment coefficient of each channel is determined to make the sample sensing signal of each channel be at the same level.

[0082] Specifically, in the embodiment of the present invention, when determining the signal adjustment coefficient, the sample sensing signal of each channel in the sample target hole can be determined based on the array eddy current probe arranged in the sample target hole of the sample bridge prestressed anchor without defects. As shown in Table 1, it is a table of the sample sensing signal amplitude of each channel when the array eddy current probe is stationary in the sample target hole.

[0083] Table 1 Amplitude of sample sensing signals for each channel when the array eddy current probe is stationary in the sample target hole

[0084]

[0085] Then, the signal adjustment coefficient of each channel can be adjusted proportionally based on the sample sensing signal of each channel, so that the sample sensing signal of each channel is at the same level, and the signal adjustment coefficient of each channel at this time is determined as the final signal adjustment coefficient of each channel. This can prevent the defect signal detection difference from being too large and difficult to distinguish.

[0086] On the basis of the above-mentioned embodiment, the method for detecting defects in the hole of a prestressed anchor of a bridge provided in the embodiment of the present invention, wherein a rotatable array eddy current probe arranged in the target hole of the prestressed anchor of the bridge is used to determine the circumferential detection signal of each channel in the target hole, including:

[0087] The array eddy current probe is rotated along the central axis of the target hole for one circle, and the induction signals output by each detection coil obtained by multiple samplings are recorded;

[0088] For any detection coil, each sampling corresponding to the detection coil is numbered in ascending order, and a corresponding relationship between the number of each sampling and the induction signal output by the detection coil is determined;

[0089] Determine the total number of sampling times, and update the middle position label of each sampling in the corresponding relationship to 0, and update the other labels except the middle position label to the difference between half of the total number of sampling times to obtain the circumferential detection signal of the channel corresponding to any detection coil.

[0090] Specifically, in the embodiment of the present invention, when determining the circumferential detection signal of each channel in the target hole, the array eddy current probe can be rotated along the central axis of the target hole for one circle, and the induction signal output by each detection coil obtained by multiple samplings can be recorded. Here, the signal can be collected once every certain rotation angle, and the total number of samplings is determined by the angle of each rotation.

[0091] For each detection coil, the samples corresponding to the detection coil can be numbered in order from small to large, and the corresponding relationship between the number of each sample and the induction signal output by the detection coil can be determined, that is, the number of each sample and the induction signal output by the detection coil obtained by each sample can be recorded in correspondence.

[0092] Then, the total number of sampling times N is determined, and the middle position label of each sampling in the above corresponding relationship is updated to 0, and the other labels except the middle position label are updated to half of the total number of sampling times, that is, the difference between 1 / N, to obtain the circumferential detection signal of the channel corresponding to the detection coil, and the circumferential detection signal of the channel includes the induction signals of N circumferential positions.

[0093] Furthermore, the data at different sampling points can be converted into the defect size at the actual position on the inner surface of the prestressed anchor hole, forming a two-dimensional defect detection map of the inner surface defects of the entire target hole.

[0094] Figure 7 is a flow chart of a method for detecting defects in a prestressed anchor hole of a bridge provided in an embodiment of the present invention, such as Figure 7 As shown, the method comprises the following steps:

[0095] S01, install eight detection coils into the grooves on the array eddy current probe in sequence, and use a glue gun to fix them in the grooves to complete the assembly of the detection coils;

[0096] S02, inserting the array eddy current probe into the target hole of the bridge prestressed anchor;

[0097] S03, hold the probe handle and rotate the array eddy current probe steadily for one circle to complete the nondestructive testing of the target hole; if there are multiple target holes, repeat S02-S03 until the nondestructive testing of all target holes is completed.

[0098] In an embodiment of the present invention, the bridge prestressed anchor can be a customized prestressed anchor, and the inner wall of the target hole has two crack defects. The circumferential detection signals of each channel are imported into the oscilloscope. Since the oscilloscope display channels are limited, only the waveform curve of the circumferential detection signal of one channel is displayed at this time. After rotating the array eddy current probe clockwise four times, eight defect signals can be detected, that is, two defects. It can be shown that the detection effect is good, which is the same as the expected detection effect.

[0099] like Figure 8 As described above, based on the above embodiments, an embodiment of the present invention provides a device for detecting defects in a prestressed anchor hole of a bridge, comprising:

[0100] The signal determination module 81 is used to determine the circumferential detection signal of each channel in the target hole based on the rotatable array eddy current probe arranged in a close relationship in the target hole of the bridge prestressed anchor; the array eddy current probe is provided with a row of grooves along the length direction, each groove is provided with a detection coil, and each detection coil corresponds to a channel;

[0101] The defect detection module 82 is used to perform defect detection on the inner wall of the target hole based on the circumferential detection signal of each channel.

[0102] On the basis of the above-mentioned embodiments, in the device for detecting defects in the hole of a prestressed anchor of a bridge provided in the embodiments of the present invention, the defect detection module is specifically used for:

[0103] Based on the signal adjustment coefficient of each channel, the circumference detection signal of each channel is adjusted to obtain the target circumference detection signal of each channel;

[0104] Based on the target circumference detection signal of each channel, the inner wall of the target hole is inspected for defects.

[0105] On the basis of the above-mentioned embodiment, in the device for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, the defect detection module is further specifically used for:

[0106] Displaying the target circumference detection signal of each channel according to the groove position where the corresponding detection coil is installed and the range length corresponding to the aperture of the target hole, respectively, to obtain display curves corresponding to the target circumference detection signals of the multiple channels;

[0107] If there is a target channel and there is a defect signal in the display curve corresponding to the target circumference detection signal of the target channel, it is determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed.

[0108] On the basis of the above-mentioned embodiment, the device for detecting defects in the hole of a prestressed anchor of a bridge provided in the embodiment of the present invention further includes a coefficient determination module for:

[0109] Determining the radial distance between every two grooves on the array eddy current probe;

[0110] Based on the radial distance, a signal adjustment coefficient of a channel corresponding to each groove is determined.

[0111] On the basis of the above-mentioned embodiment, in the device for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, the coefficient determination module is further used for:

[0112] Based on the array eddy current probe arranged in the sample target hole of the sample bridge prestressed anchor without defects, determine the sample sensing signal of each channel in the sample target hole;

[0113] Based on the sample sensing signal of each channel, a signal adjustment coefficient of each channel is determined to make the sample sensing signal of each channel be at the same level.

[0114] On the basis of the above-mentioned embodiment, in the device for detecting defects in a prestressed anchor hole of a bridge provided in the embodiment of the present invention, the signal determination module is specifically used for:

[0115] The array eddy current probe is rotated along the central axis of the target hole for one circle, and the induction signals output by each detection coil obtained by multiple samplings are recorded;

[0116] For any detection coil, each sampling corresponding to the detection coil is numbered in ascending order, and a corresponding relationship between the number of each sampling and the induction signal output by the detection coil is determined;

[0117] Determine the total number of sampling times, and update the middle position label of each sampling in the corresponding relationship to 0, and update the other labels except the middle position label to the difference between half of the total number of sampling times to obtain the circumferential detection signal of the channel corresponding to any detection coil.

[0118] Specifically, the functions of each module in the device for detecting defects in prestressed anchor holes of bridges provided in the embodiment of the present invention correspond one-to-one to the operating procedures of each step in the above-mentioned method embodiment, and the effects achieved are also consistent. Please refer to the above-mentioned embodiment for details, and no further details will be given in the embodiment of the present invention.

[0119] On the basis of the above embodiments, an embodiment of the present invention provides a bridge prestressed anchor hole defect detection system, comprising: a bridge prestressed anchor hole defect detection device provided in the above embodiments, and an array eddy current probe;

[0120] The defect detection device in the bridge prestressed anchor hole is connected to the detection coils installed in the grooves of the array eddy current probe.

[0121] Fig. 9 An example of a physical structure diagram of an electronic device is shown in FIG. Fig. 9 As shown, the electronic device may include: a processor 910, a communication interface 920, a memory 930 and a communication bus 940, wherein the processor 910, the communication interface 920 and the memory 930 communicate with each other through the communication bus 940. The processor 910 may call the logic instructions in the memory 930 to execute the defect detection method in the bridge prestressed anchor hole provided in the above-mentioned embodiments, the method comprising: based on a rotatable array eddy current probe arranged in a fit in the target hole of the bridge prestressed anchor, determining the circumferential detection signal of each channel in the target hole; the array eddy current probe is provided with a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel; based on the circumferential detection signal of each channel, the inner wall of the target hole is subjected to defect detection.

[0122] In addition, the logic instructions in the above-mentioned memory 930 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0123] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the defect detection method for the bridge prestressed anchor hole provided in the above-mentioned embodiments, the method including: based on a rotatable array eddy current probe arranged in a fit in the target hole of the bridge prestressed anchor, determining the circumferential detection signal of each channel in the target hole; the array eddy current probe has a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel; based on the circumferential detection signal of each channel, the inner wall of the target hole is detected for defects.

[0124] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the method for detecting defects in the hole of a prestressed anchor of a bridge provided in the above-mentioned embodiments, the method comprising: based on a rotatable array eddy current probe arranged in a fit within a target hole of the prestressed anchor of the bridge, determining a circumferential detection signal of each channel in the target hole; the array eddy current probe has a row of grooves formed along the length direction, a detection coil is installed in each groove, and each detection coil corresponds to a channel; based on the circumferential detection signal of each channel, defect detection is performed on the inner wall of the target hole.

[0125] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0126] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting defects in a prestressed anchor hole of a bridge, characterized in that: include: Based on a rotatable array eddy current probe arranged in a target hole of a bridge prestressed anchor, a circumferential detection signal of each channel in the target hole is determined; the array eddy current probe has a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel; Based on the circumferential detection signals of each channel, defect detection is performed on the inner wall of the target hole; The method of performing defect detection on the inner wall of the target hole based on the circumferential detection signal of each channel includes: Based on the signal adjustment coefficient of each channel, the circumference detection signal of each channel is adjusted to obtain the target circumference detection signal of each channel; Based on the target circumference detection signal of each channel, performing defect detection on the inner wall of the target hole; The method of performing defect detection on the inner wall of the target hole based on the target circumference detection signal of each channel includes: Displaying the target circumference detection signal of each channel according to the groove position where the corresponding detection coil is installed and the range length corresponding to the aperture of the target hole, respectively, to obtain display curves corresponding to the target circumference detection signals of the multiple channels; If there is a target channel, and there is a defect signal in the display curve corresponding to the target circumference detection signal of the target channel, it is determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed; The method for determining the signal adjustment coefficient includes: Determining the radial distance between every two grooves on the array eddy current probe; Based on the radial distance, determining a signal adjustment coefficient of a channel corresponding to each groove; The rotatable array eddy current probe arranged in the target hole based on the bridge prestressed anchor determines the circumferential detection signal of each channel in the target hole, including: The array eddy current probe is rotated along the central axis of the target hole for one circle, and the induction signals output by each detection coil obtained by multiple samplings are recorded; For any detection coil, each sampling corresponding to the detection coil is numbered in ascending order, and a corresponding relationship between the number of each sampling and the induction signal output by the detection coil is determined; Determine the total number of sampling times, and update the middle position label of each sampling in the corresponding relationship to 0, and update the other labels except the middle position label to the difference between half of the total number of sampling times to obtain the circumferential detection signal of the channel corresponding to any detection coil.

2. The method for detecting defects in prestressed anchor holes of bridges according to claim 1, characterized in that: The method for determining the signal adjustment coefficient also includes: Based on the array eddy current probe arranged in the sample target hole of the sample bridge prestressed anchor without defects, determine the sample sensing signal of each channel in the sample target hole; Based on the sample sensing signal of each channel, a signal adjustment coefficient of each channel is determined to make the sample sensing signal of each channel be at the same level.

3. A device for detecting defects in a prestressed anchor hole of a bridge, characterized in that: include: A signal determination module is used to determine the circumferential detection signal of each channel in the target hole based on a rotatable array eddy current probe arranged in a close fit in the target hole of the bridge prestressed anchor; the array eddy current probe is provided with a row of grooves along the length direction, each groove is installed with a detection coil, and each detection coil corresponds to a channel; A defect detection module, used for performing defect detection on the inner wall of the target hole based on the circumferential detection signal of each channel; The method of performing defect detection on the inner wall of the target hole based on the circumferential detection signal of each channel includes: Based on the signal adjustment coefficient of each channel, the circumference detection signal of each channel is adjusted to obtain the target circumference detection signal of each channel; Based on the target circumference detection signal of each channel, performing defect detection on the inner wall of the target hole; The method of performing defect detection on the inner wall of the target hole based on the target circumference detection signal of each channel includes: Displaying the target circumference detection signal of each channel according to the groove position where the corresponding detection coil is installed and the range length corresponding to the aperture of the target hole, respectively, to obtain display curves corresponding to the target circumference detection signals of the multiple channels; If there is a target channel, and there is a defect signal in the display curve corresponding to the target circumference detection signal of the target channel, it is determined that there is a defect in the hole position corresponding to the groove position where the detection coil corresponding to the target channel is installed; The method for determining the signal adjustment coefficient includes: Determining the radial distance between every two grooves on the array eddy current probe; Based on the radial distance, determining a signal adjustment coefficient of a channel corresponding to each groove; The rotatable array eddy current probe arranged in the target hole based on the bridge prestressed anchor determines the circumferential detection signal of each channel in the target hole, including: The array eddy current probe is rotated along the central axis of the target hole for one circle, and the induction signals output by each detection coil obtained by multiple samplings are recorded; For any detection coil, each sampling corresponding to the detection coil is numbered in ascending order, and a corresponding relationship between the number of each sampling and the induction signal output by the detection coil is determined; Determine the total number of sampling times, and update the middle position label of each sampling in the corresponding relationship to 0, and update the other labels except the middle position label to the difference between half of the total number of sampling times to obtain the circumferential detection signal of the channel corresponding to any detection coil.

4. A bridge prestressed anchor hole defect detection system, characterized in that: include: The device for detecting defects in the holes of prestressed anchors of bridges as claimed in claim 3, and an array eddy current probe; The defect detection device in the bridge prestressed anchor hole is connected to the detection coils installed in the grooves of the array eddy current probe.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for detecting defects in the hole of a prestressed anchor of a bridge as described in any one of claims 1 to 2 is implemented.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for detecting defects in a bridge prestressed anchor hole as described in any one of claims 1 to 2 is implemented.

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