Prefabricated pipe pile welding quality detection device and method

Abstract

The invention discloses a prefabricated pipe pile welding quality detection device and method. The device comprises a signal transmitting end, a signal receiving sensor, a magnetic base and a signal processing module. The signal transmitting end is used for transmitting linear constant-amplitude signals; the signal receiving sensor is used for receiving linear constant-amplitude signals reflected from a welding area; the magnetic base is used for fixing the signal transmitting end and the signal receiving sensor on a measuring point of a pile to be measured; the signal processing module is used for judging the weld quality through spectrum analysis. The bottom of the transmitting-receiving sensor is connected with the magnetic base and is arc-shaped, so that the transmitting-receiving sensor can be conveniently coupled with a measured pile, and the measurement accuracy can be ensured; arc-shaped handles are arranged at two ends of the magnetic base, so that the transceiving sensor can be moved conveniently and quickly; and the transmitting end adopts linear constant-amplitude signals, so that the stability of detection data is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated pipe pile quality detection, and in particular relates to a prefabricated pipe pile welding quality detection device and method. Background Art

[0002] Prefabricated pipe piles are gradually being used in foundation treatment, bridge pile foundation columns, etc. due to their advantages such as high concrete strength of the pile body, short construction period, low cost, and guaranteed pile body quality. When the pile length in foundation treatment is long and needs to be connected, or when the column is connected to the pile foundation, welding is generally used for connection. Relevant specifications for the detection of welding quality such as cracks, slag inclusions, incomplete penetration, and lack of fusion are limited. According to the "Technical Regulations for the Inspection of Piles in Highway Engineering", it is required that "the joint welds of the steel bars should be continuous and full when connecting piles." However, the conventional method is to use manual observation for detection, which is greatly affected by human factors.

[0003] The invention patent "A device and method for quantitatively detecting the quality of weld seams of prefabricated pipe piles" (CN115559363A) requires slotting the pipe piles to bury the conductors. This not only damages the quality of the pipe piles themselves, but also affects the durability of the pipe piles. It is also time-consuming and expensive, making it difficult to apply on a large scale in engineering.

[0004] The invention patent "An array ultrasonic detection device for prestressed pipe pile welds" (CN113325082A) designs an ultrasonic detection technology that combines an ultrasonic straight probe with an oblique probe. However, ultrasonic flaw detection requires that the surface of the test object is smooth, but this standard is difficult to achieve in actual engineering. In addition, ultrasonic detection does not display defects intuitively, and the flaw detection technology is difficult and easily affected by subjective and objective factors. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a prefabricated pipe pile welding quality detection device and method to solve the above problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a prefabricated pipe pile welding quality detection device, comprising a signal transmitting end, a signal receiving sensor, a magnetic base and a signal processing module;

[0007] The signal transmitting end is used to transmit a linear equal-amplitude signal;

[0008] The signal receiving sensor is used to receive the linear equal-amplitude signal reflected from the welding area;

[0009] The magnetic base is used to fix the signal transmitting end and the signal receiving sensor on the measuring point of the pile to be measured;

[0010] The signal processing module is used to judge the quality of the weld through spectrum analysis.

[0011] Preferably, a bolt hole is provided at the bottom of the signal transmitting end, and the linear equal-amplitude signal includes a chirp signal.

[0012] Preferably, a bolt hole is provided at the bottom of the signal receiving sensor, and the signal receiving sensor comprises a MEMS type acceleration sensor.

[0013] Preferably, the signal transmitting end and the signal receiving sensor are symmetrically arranged on both sides of the weld of the prefabricated pipe pile.

[0014] Preferably, the shape of the magnetic base includes but is not limited to a rectangle, and the magnetic base is bent along the long side direction, and the bending radius is equal to the radius of the pile foundation to be measured.

[0015] Preferably, a screw is provided at the center of the magnetic base, and the screw matches the bolt holes of the signal transmitting end and the signal receiving sensor; an arc-shaped handle is provided at the end of the long side of the magnetic base.

[0016] The present invention also proposes a method for detecting the welding quality of prefabricated pipe piles, comprising the following steps:

[0017] Determine the outstanding frequency of the reference pile and use the outstanding frequency as the benchmark data for judging the welding quality of the pile to be tested;

[0018] Determine the measuring point of the pile to be measured, and use sandpaper to remove rust and dust at the measuring point;

[0019] The signal transmitting end and the signal receiving sensor are mounted at the measuring point through a magnetic base;

[0020] Obtain the measured frequency through the signal transmitting end and the signal receiving sensor;

[0021] The weld quality is judged based on the benchmark data and the measured frequency.

[0022] Preferably, the center point of the measuring point is 4-5 cm away from the weld, and the spacing between the measuring points is 5 cm during each measurement.

[0023] Preferably, the method for judging the quality of the weld based on the benchmark data and the measured frequency includes:

[0024] When the reference data is equal to the measured frequency, the weld is judged to be intact;

[0025] When the reference data is not equal to the actual measured frequency, the weld is judged to be defective.

[0026] Preferably, the measured frequency is an average value of at least three groups of detection data at each measuring point.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects:

[0028] The present invention discloses a prefabricated pipe pile welding quality detection device and method, the device includes a signal transmitting end, a signal receiving sensor, a magnetic base and a signal processing module; the signal transmitting end is used to transmit a linear equal-amplitude signal; the signal receiving sensor is used to receive a linear equal-amplitude signal reflected from a welding area; the magnetic base is used to fix the signal transmitting end and the signal receiving sensor on a measuring point of a pile to be tested; the signal processing module is used to judge the weld quality by spectrum analysis. The bottom of the transceiver sensor of the present invention is connected to the magnetic base and adopts an arc shape, which is convenient for coupling with the pile to be tested, thereby ensuring the accuracy of the measurement; arc handles are arranged at both ends of the magnetic base, which is convenient and quick to move the transceiver sensor, and will not damage the quality of the pipe pile itself; the transmitting end adopts a linear equal-amplitude signal, which improves the stability of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 This is a schematic diagram of a weld of a prefabricated pipe pile according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of a prefabricated pipe pile weld detection device according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a magnetic base according to an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the detection results of an embodiment of the present invention;

[0034] Figure 5 4 is a time domain waveform diagram of a Chirp signal of equal amplitude according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0037] Embodiment 1

[0038] like Figure 1-3As shown, in this embodiment, a prefabricated pipe pile welding quality detection device is provided, including a signal transmitting end, a signal receiving sensor, a magnetic base and a signal processing module;

[0039] The signal transmitting end is used to transmit a linear equal-amplitude signal;

[0040] The signal receiving sensor is used to receive the linear equal-amplitude signal reflected from the welding area;

[0041] The magnetic base is used to fix the signal transmitter and the signal receiving sensor on the measuring point of the pile to be measured;

[0042] The signal processing module is used to judge the weld quality through spectrum analysis.

[0043] Furthermore, a bolt hole is provided at the bottom of the signal transmitting end, and the linear equal amplitude signal includes a chirp signal. The time domain expression of the chirp signal is as follows:

[0044] Chirp(t)=w(t)cos(2π(f min t+kt 2 ) (1)

[0045] In formula (1), w(t) is called the signal weighting function, f min is the initial frequency, and k is the frequency conversion rate. When the weighting function w(t) is a constant, the time domain expression of the Chirp signal with constant amplitude is formed; and the different expressions of the k value also correspond to their respective signal forms.

[0046] The time domain waveform of the equal-amplitude Chirp signal is as follows Figure 5 shown.

[0047] For a linear Chirp signal, the numerical expression of its instantaneous frequency changing linearly with time is as follows:

[0048] f(t)=f0+K*t (2)

[0049] In formula (2), f0 is the initial frequency and K is the frequency sweep rate. That is, the instantaneous frequency of the signal increases to a fixed value.

[0050] Furthermore, a bolt hole is provided at the bottom of the signal receiving sensor, and the signal receiving sensor comprises a MEMS acceleration sensor with a signal bandwidth of 1 Hz to 12 KHz and a sensitivity of 10 mV / g.

[0051] Furthermore, the signal transmitting end and the signal receiving sensor are symmetrically arranged on both sides of the weld of the prefabricated pipe pile, and the center distance to the weld is greater than 4 cm and less than 5 cm.

[0052] Furthermore, the shape of the magnetic base includes but is not limited to a rectangle, the rectangle has a length a=4 cm and a width b=2 cm, and the magnetic base is bent along the long side, and the bending radius is equal to the radius of the pile foundation to be measured.

[0053] Furthermore, a screw is provided at the center of the magnetic base, the screw length l=0.5cm, and the screw matches the bolt holes of the signal transmitting end and the signal receiving sensor; an arc handle is provided at the end of the long side of the magnetic base, and the arc radius R2=b=2cm.

[0054] This embodiment also provides a prefabricated pipe pile welding quality detection method, comprising the following steps:

[0055] Determine the outstanding frequency f0 of the reference pile, and use the outstanding frequency as the reference data for judging the welding quality of the pile to be tested;

[0056] Determine the measuring point of the pile to be measured, and use sandpaper to remove rust and dust at the measuring point;

[0057] The signal transmitter and the signal receiving sensor are installed at the measuring point through the magnetic base;

[0058] Obtain the measured frequency f through the signal transmitting end and the signal receiving sensor;

[0059] Judge weld quality based on benchmark data and measured frequencies.

[0060] Repeat the test steps to obtain the test results. Figure 4 As shown in the figure, the superior frequency bandwidth of test 001 is obviously larger than that of test 002 and test 003, while the superior frequency peaks are basically equal, indicating that the sensor did not make good contact with the contact surface or the signal transmission was unstable when the first test (test 001) was just started. After debugging, the second and third tests (test 002 and test 003) showed normal results. In this case, the fourth test should be carried out and the first test result should be filtered out.

[0061] Furthermore, the center point of the measuring point is 4-5 cm away from the weld, and the spacing between the measuring points is 5 cm during each measurement.

[0062] Further, the method for judging the quality of the weld based on the benchmark data and the measured frequency includes:

[0063] When the reference data is equal to the measured frequency, the weld is judged to be intact;

[0064] When the reference data is not equal to the actual measured frequency, the weld is judged to be defective.

[0065] Furthermore, the measured frequency is an average value of at least three groups of data detected at each measuring point.

[0066] The present invention has the following advantages:

[0067] (1) The device is easy to operate. The bottom of the transceiver sensor is connected to a magnetic base and is arc-shaped, which is convenient for coupling with the pile (column) to be measured, thereby ensuring the accuracy of the measurement. Arc-shaped handles are set at both ends of the magnetic base to facilitate the movement of the transceiver sensor, which is convenient and quick. The transmitting end uses a linear equal-amplitude signal, which improves the stability of the detection data.

[0068] (2) The device and detection method solve the defects existing in the background technology and can conveniently, quickly, accurately and effectively detect the welding problems of pipe piles (columns) to ensure the quality and safety of the project.

[0069] (3) The device and detection method do not require specific professional knowledge and can be operated by general technical workers, which is convenient for promotion and application.

[0070] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A prefabricated pipe pile welding quality detection device, characterized in that: It includes a signal transmitting end, a signal receiving sensor, a magnetic base and a signal processing module; The signal transmitting end is used to transmit a linear equal-amplitude signal; The signal receiving sensor is used to receive the linear equal-amplitude signal reflected from the welding area; The magnetic base is used to fix the signal transmitting end and the signal receiving sensor on the measuring point of the pile to be measured; The signal processing module is used to judge the quality of the weld through spectrum analysis.

2. The prefabricated pipe pile welding quality detection device according to claim 1 is characterized in that: A bolt hole is arranged at the bottom of the signal transmitting end, and the linear equal-amplitude signal includes a chirp signal.

3. The prefabricated pipe pile welding quality detection device according to claim 1 is characterized in that: The bottom of the signal receiving sensor is provided with a bolt hole, and the signal receiving sensor comprises a MEMS type acceleration sensor.

4. The prefabricated pipe pile welding quality detection device according to claim 1, characterized in that: The signal transmitting end and the signal receiving sensor are symmetrically arranged on both sides of the weld of the prefabricated pipe pile.

5. The prefabricated pipe pile welding quality detection device according to claim 1, characterized in that: The shape of the magnetic base includes but is not limited to a rectangle, and the magnetic base is bent along the long side direction, and the bending radius is equal to the radius of the pile foundation to be measured.

6. The prefabricated pipe pile welding quality detection device according to claim 1, characterized in that: A screw is arranged at the center of the magnetic base, and the screw is matched with the bolt holes of the signal transmitting end and the signal receiving sensor; an arc-shaped handle is arranged at the end of the long side of the magnetic base.

7. A method for detecting the welding quality of prefabricated pipe piles, characterized in that: The following steps are involved: Determine the outstanding frequency of the reference pile and use the outstanding frequency as the benchmark data for judging the welding quality of the pile to be tested; Determine the measuring point of the pile to be measured, and use sandpaper to remove rust and dust at the measuring point; The signal transmitter and the signal receiving sensor are installed at the measuring point through a magnetic base; the actual measured frequency is obtained through the signal transmitter and the signal receiving sensor; The weld quality is judged based on the benchmark data and the measured frequency.

8. The method for detecting welding quality of prefabricated pipe piles according to claim 7, characterized in that: The center of the measuring point is 4-5cm away from the weld, and the distance between the measuring points is 5cm each time.

9. The method for detecting welding quality of prefabricated pipe piles according to claim 7, characterized in that: The method for judging the quality of the weld based on the benchmark data and the measured frequency includes: When the reference data is equal to the measured frequency, the weld is judged to be intact; When the reference data is not equal to the actual measured frequency, the weld is judged to be defective.

10. The method for detecting welding quality of prefabricated pipe piles according to claim 7, characterized in that: The measured frequency is the average value of at least three groups of detection data at each measuring point.

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