Disc buckle type scaffold damage detection device and method based on pneumatic acoustic wave method

Abstract

The invention discloses a disc buckle type scaffold damage detection device and method based on a pneumatic sound wave method, and belongs to the technical field of nondestructive testing, the device comprises a disc buckle type scaffold, a first hollow vertical rod, a second hollow vertical rod, a hollow cross rod and a hollow inclined rod which are all of hollow structures, and a disc buckle and a connecting buckle are solid; the air blowing device comprises an air compressor, an air pipe, an air nozzle, an air regulating valve, a support, a pressure relief device and a noise suppressor, and the air blowing device is connected with the ring lock type scaffold through the air nozzle; the damage detection module comprises a fixing device, a sound wave signal sensor and a signal analysis system, and the damage detection module is connected with the ring lock type scaffold through the sound wave signal sensor. The method can quickly identify and position the damage of the ring-lock scaffold, and can be used for detecting the damage of the ring-lock scaffold in a real environment.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a disc-type scaffold damage detection device and method based on a pneumatic acoustic wave method. Background Art

[0002] The disc-type scaffolding has been widely used in construction due to its efficient assembly method and good load-bearing performance. Since the scaffolding often needs to bear various complex loads during the construction process, especially in the case of long-term use or repeated disassembly and assembly, it is easy to have problems such as fatigue, deformation, cracks and corrosion. Through detection, potential structural problems can be discovered in time, the load-bearing capacity of the scaffolding can be evaluated, and it is ensured that all parts of the scaffolding are in good working condition during the construction process. However, the existing scaffolding detection technology has problems such as difficulty in detecting fine cracks, large environmental interference, and complex and expensive equipment, resulting in low accuracy and efficiency of the detection results. Therefore, the present invention proposes a disc-type scaffolding damage detection device and method based on the pneumatic acoustic wave method. By introducing an air blowing device and an acoustic sensor, rapid and accurate detection of internal damage of the scaffolding is achieved, overcoming the limitations of traditional methods. The method is convenient for construction and can also provide reliable damage detection results in complex environments, significantly improving construction safety and detection efficiency.

[0003] After review, compared with the published patents, this patent has the following originality:

[0004] CN202410474020.6 discloses a damage identification method, device and computer equipment for a construction scaffold. A numerical model corresponding to the specific structure of the construction scaffold can be constructed according to the specific structure of the construction scaffold, the detection points of each layer of the construction scaffold can be determined, and detection devices can be set at the detection points to obtain the structural response of the detection points, but no specific detection method is described; CN202320006514.2 discloses a local anti-instability monitoring and alarm structure for a scaffold, but it cannot detect damage to the scaffold; CN103852522B discloses a method for scaffold safety monitoring and early warning, which is a passive detection method and cannot obtain existing damage to the scaffold. In addition, the acoustic emission technology is too expensive and cannot achieve long-term real-time monitoring. Summary of the invention

[0005] In view of the problems that the existing scaffolding detection technology has difficulty in detecting fine cracks, is greatly affected by environmental interference, and has complex and expensive equipment, the present invention proposes a disc-type scaffolding damage detection device and method based on pneumatic acoustic wave method.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the present invention provides a disc-type scaffolding damage detection device and method based on the pneumatic acoustic wave method, including a disc-type scaffolding, an air blowing device and a damage detection module and a disc-type scaffolding damage detection method based on the pneumatic acoustic wave method.

[0007] The present invention provides a disc-type scaffold damage detection device and method based on pneumatic acoustic wave method, characterized in that: the disc-type scaffold comprises a first hollow vertical pole, a second hollow vertical pole, a hollow cross bar, a hollow diagonal rod, a disc, and a connecting fastener, such as Figure 1 shown.

[0008] Furthermore, the upper part of the second hollow vertical pole is fixed with a disc buckle by welding, and the lower part of the first hollow vertical pole is inserted into the upper part of the second hollow vertical pole; the hollow cross bar and the hollow diagonal rod are both welded with connecting fasteners at the ends; the hollow cross bar and the hollow diagonal rod are connected to the second hollow vertical pole by inserting the connecting fasteners into the cross bar sockets of the disc buckle.

[0009] Furthermore, the No. 1 hollow vertical pole, No. 2 hollow vertical pole, hollow cross bar and hollow diagonal rod can be provided with air inlet holes, No. 1 air outlet holes and No. 2 air outlet holes, respectively located at the two ends of the hollow pole, the air inlet holes, No. 1 air outlet holes and No. 2 air outlet holes also include reinforcement rings arranged at the edges of the holes, and the No. 1 air outlet holes and No. 2 air outlet holes overlap after the No. 1 hollow vertical pole is inserted into the No. 2 hollow vertical pole.

[0010] Preferably, the air inlet, the first air outlet and the second air outlet are circular.

[0011] Preferably, the reinforcing ring is made of the same material as the scaffolding, but may also be made of a material with higher strength.

[0012] The air blowing device comprises an air compressor, an air pipe, an air nozzle, a gas regulating valve, a bracket, a pressure relief device and a noise suppressor.

[0013] Further, the air compressor is connected to an air pipe, an air nozzle is provided at the end of the air pipe, the air compressor is arranged on a bracket, the bracket is placed on a scaffolding board adjacent to the scaffolding rod to be tested, the gas regulating valve connects the air pipe and the air nozzle, the noise suppressor is installed at the outlet of the air nozzle; the pressure relief device is installed on the side of the air nozzle;

[0014] The damage detection module includes a fixing device, an acoustic wave signal sensor and a signal analysis system; the fixing device includes a magnetic base and an adjustment arm; the magnetic base is connected to the adjustment arm, and a chuck is provided at the end of the adjustment arm; the acoustic wave signal sensor includes an acoustic wave sensing element and a signal transmission line, the acoustic wave sensing element is connected to the signal transmission line, the acoustic wave sensing element is fixed on the chuck and is close to the rod to be tested.

[0015] A device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method, characterized in that the main contents of the method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method are: fixing the disc-type scaffold on the ground, placing an air blowing device near the scaffold to be tested, detecting the ventilation state of the hollow rods of the scaffold to be tested, debugging a damage detection module, and using the damage detection module to test the scaffold to be tested.

[0016] Furthermore, the lower part of the second hollow vertical pole (7) is inserted into the ground and reinforced with a supporting pad.

[0017] Furthermore, the ambient noise of the air blowing device shall not be higher than 60db, and the change of the ambient noise during the detection period shall not be greater than 20db.

[0018] Preferably, high-pressure air blowing is used to blow out the debris in the hollow rod.

[0019] Preferably, a noise suppressor is used in a high noise environment to reduce the impact of environmental noise on the acoustic sensor.

[0020] Furthermore, the acoustic signal S1(t) of the sensor is recorded at 1 / 3 of the rod, and the acoustic signal S2(t) of the sensor is recorded at 1 / 3 of the rod within 5 minutes. By using the signal difference between adjacent measuring points, the influence of background noise and normal airflow sound is eliminated, and the damage signal S is extracted. d (t), calculated by the following formula:

[0021] S d (t) = S1(t) - S2(t) (1)

[0022] Preferably, the signal is divided into multiple time windows, each of which has a length Δt, and Δt can be adjusted. The frequency and amplitude characteristics of the signal in each time window are analyzed, and the characteristic signal related to the damage is identified by comparing the changes of the signals in different time windows.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are:

[0024] The present invention provides a disc-type scaffolding damage detection device and method based on the pneumatic acoustic wave method. Compared with the prior art, the present invention realizes rapid and accurate detection of scaffolding damage by combining the pneumatic acoustic wave method with an acoustic sensor, overcoming the problem that traditional detection methods are difficult to detect subtle damage inside hollow structures; the method provided by the present invention is easy to operate, can be flexibly applied in complex construction environments, and significantly improves detection efficiency and safety. In addition, the method provided by the present invention significantly reduces the detection cost, and prolongs the service life of the scaffolding through non-destructive detection means, further ensuring the structural safety and reliability during the construction process, and is expected to be widely used in various types of construction and large-scale infrastructure projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced one by one below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of a disc-type scaffold structure provided in Example 1;

[0027] Figure 2 A schematic diagram of the structure of a hollow vertical rod, a hollow horizontal rod, and a hollow diagonal rod provided in Example 1;

[0028] Figure 3 A schematic diagram of an air blowing device provided in Example 2;

[0029] Figure 4 A schematic diagram of a damage detection module provided in Example 4;

[0030] In the above figures, 1. Hollow vertical pole No. 1; 2. Hollow diagonal pole; 3. Hollow horizontal pole; 4. Plate buckle; 5. Connecting fastener; 6. Air inlet; 7. Hollow vertical pole No. 2; 8. Air outlet No. 2; 9. Air outlet No. 1; 10. Reinforcement ring; 11. Horizontal pole jack; 12. Air compressor; 13. Air pipe; 14. Air nozzle; 15. Gas regulating valve; 16. Bracket; 17. Pressure relief device; 18. Noise suppressor; 19. Sound wave sensing element; 20. Signal analysis system; 21. Magnetic meter stand; 22. Adjustment arm; 23. Chuck; 24. Signal transmission line. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0033] Example 1: This example is intended to implement the installation of a disc-type scaffolding structure. Please refer to Figure 1 and Figure 2 When installing the disc-type scaffolding on the ground, you need to follow the following steps to ensure the safety and stability of the structure:

[0034] 1. Make sure the ground is flat, solid, and has sufficient load-bearing capacity. If the ground is soft or uneven, it needs to be reinforced or a support pad is laid to prevent the scaffolding from settling or tilting.

[0035] 2. Place a solid pad at the bottom of each pole to ensure that the load is evenly distributed on the ground and avoid excessive point pressure causing ground subsidence.

[0036] 3. Insert the bottom of the second hollow pole (7) into the socket on the pad, making sure that each pole is perpendicular to the ground and calibrated using a level ruler.

[0037] 4. Weld the buckle (4) to the predetermined height of the second hollow vertical pole (7) to ensure that the buckle surface is horizontal.

[0038] 5. Connect the hollow cross bar (3) and the hollow diagonal bar (2) to the second hollow vertical bar (7) by inserting the connecting fasteners (5) into the cross bar insertion holes (11) of the buckle (4) to ensure that the connection between the bars is firm and not loose.

[0039] 6. Insert the bottom of the No. 1 hollow pole (1) into the upper part of the No. 2 hollow pole (7), ensuring that the poles are aligned and that the No. 1 air outlet (9) and the No. 2 air outlet (8) overlap.

[0040] 7. Continue to install more layers of vertical poles, horizontal poles and diagonal poles upwards as needed. The installation method of each layer is the same as the base layer.

[0041] 8. Ensure that all the connections between the buckles (4), connecting fasteners (5) and rods are firm and not loose or offset.

[0042] 9. Use a spirit level and plumb line to check the verticality of the uprights and the horizontality of the crossbars again. If there are any deviations, make adjustments in time.

[0043] 10. Test the stability of the scaffolding by gently pushing and pulling to ensure that the structure will not shift or tilt during use.

[0044] 11. Lay scaffolding in appropriate locations to ensure that construction workers have a safe operating platform. Install safety nets, guardrails and other protective facilities according to construction needs to ensure construction safety.

[0045] Example 2: This example is intended to provide an example of the placement of an air blowing device. Figure 3 When placing the air blowing device, you need to follow the following steps to ensure the stability of the air blowing device:

[0046] 1. The inspector lays a scaffolding board near the inspection position of the scaffolding to ensure the stability of personnel and equipment during the operation. The air compressor (12) is placed on the scaffolding board and fixed by a bracket (16) to ensure that the air compressor (12) will not be displaced or tipped over during the operation.

[0047] 2. Connect one end of the air pipe (13) to the air compressor (12) and the other end to the air nozzle (14). The shape and size of the air nozzle (14) match the air inlet hole (6) of the hollow rod to ensure that the air flow can be smoothly injected into the rod.

[0048] 3. Fasten the air nozzle (14) to the air inlet (6) of the rod to be tested, and ensure the airtightness between the air nozzle (14) and the air inlet (6) to prevent air leakage. Adjust the angle and direction of the air nozzle to align it with the air inlet.

[0049] 4. A gas regulating valve is connected between the air pipe (13) and the air nozzle (14). The pressure and flow of the air flow can be accurately controlled by the regulating valve to ensure the stability and appropriateness of the air flow.

[0050] 5. A noise suppressor (18) is installed at the outlet of the air nozzle (14) to reduce the noise generated by the air flow and avoid interference with the detection signal of the acoustic sensor (19).

[0051] 6. A pressure relief device (17) is installed on the side of the air nozzle (14) to safely release the residual pressure in the air pipe after the test is completed to prevent damage to the equipment or injury to the operator.

[0052] Embodiment 3, this embodiment aims to provide a test example of the ventilation state of the hollow rod of the scaffold to be tested. When testing the ventilation state of the hollow rod of the scaffold to be tested, it is necessary to follow the following steps to ensure the accuracy of the test:

[0053] 1. Perform a visual inspection of the rod to be tested to ensure there is no obvious physical damage, blockage or other problems that may affect the ventilation effect.

[0054] 2. Start the air compressor (12), gradually increase the air flow pressure, and control the air flow into the hollow rod through the gas regulating valve (15). The pressure sensor monitors the air flow pressure in real time to ensure that the pressure is stable.

[0055] 3. Observe the airflow from the air outlet to confirm the stability and continuity of the airflow. Determine whether the ventilation is smooth by the reading of the pressure sensor. If the airflow pressure suddenly rises or fluctuates, it may indicate poor ventilation or partial blockage.

[0056] 4. Arrange an acoustic sensor near the air outlet (8) of the rod to capture the sound wave signal generated when the airflow passes through the rod. Analyze the spectrum and intensity of the signal to determine the degree of ventilation.

[0057] 5. Clean the rods with poor ventilation to ensure that there is no blockage inside. After cleaning, test the ventilation status again to confirm that the problem has been solved.

[0058] 6. If the ventilation condition cannot be improved after cleaning, replace the rod to ensure the overall ventilation effect and structural safety of the scaffolding.

[0059] Embodiment 4: This embodiment aims to provide an example of debugging a damage detection module. When debugging a damage detection module, the following steps need to be followed to ensure a good debugging effect:

[0060] 1. Start the air blowing device, let the air flow through the rod, and observe the real-time output of the acoustic signal sensor. Check whether the sensor can capture the acoustic signal generated by the air flow passing through the damaged area.

[0061] 2. Based on the results of the preliminary test, optimize the sensitivity of the sensor by adjusting the amplifier gain or filter parameters of the sensor so that it can accurately capture damage signals under different airflow intensities.

[0062] 3. Gradually adjust the air flow pressure and flow rate of the air blowing device, test the response of the sensor at different frequencies, and ensure that the sensor can maintain good response characteristics throughout the expected frequency range.

[0063] Embodiment 5, this embodiment aims to provide an example of using a damage detection module to test a scaffold to be tested. When testing scaffold damage, the following steps need to be followed to ensure the accuracy of the test results:

[0064] 1. Based on the results of the preliminary safety assessment, select the most critical areas of the scaffolding structure for testing.

[0065] 2. Prepare a debugged damage detection module, including the acoustic wave sensing element (19), the signal transmission line (24) and the signal analysis system (20), and ensure that all components are in good working condition.

[0066] 3. Install the acoustic signal sensor on the selected scaffolding node. First, firmly adsorb the magnetic base (21) of the fixing device on the surface of the rod to be tested, and adjust the position of the sensor through the adjustment arm (22) so that it is close to the surface of the node to be tested to ensure the stability of signal collection.

[0067] 4. Connect the sensor to the signal analysis system (20) via a signal transmission line (24) to ensure that there is no loss or interference during signal transmission.

[0068] 5. Install the air blowing device at the appropriate position of the scaffold to be tested, and ensure that the air compressor (12), air pipe (13), air nozzle (14), gas regulating valve (15) and other equipment are connected correctly. The air nozzle (14) should be installed at the air inlet (6) of the hollow rod to ensure that the air flow can smoothly enter the rod.

[0069] 6. Start the air compressor (12) to gradually increase the air flow pressure and allow the air flow to pass through the hollow rod. The acoustic wave signal sensor will capture the acoustic wave signal generated by the air flow passing through the damaged part in real time.

[0070] 7. The signal analysis system (20) analyzes the acoustic wave signals collected by the sensor in real time. The system determines whether there is damage and accurately locates the location of the damage through spectrum analysis, time domain analysis and pattern recognition of the signal.

[0071] 8. The signal analysis system (20) performs a detailed analysis of the signal at each detection point to identify abnormal signals and damage features. The system outputs the health status of each detection point, including whether there are cracks, corrosion or other structural damage, and the severity of the damage.

[0072] 9. Based on the data from all test points, generate an overall health assessment report for the scaffold to be tested. The report should include the location, type, severity of each damage point, and the impact assessment on the overall structural safety.

Claims

1. A device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method, characterized in that: The pneumatic acoustic wave method-based disc-type scaffolding damage detection device and method include a disc-type scaffolding, an air blowing device and a damage detection module; The disc-type scaffolding comprises a first hollow vertical pole (1), a second hollow vertical pole (7), a hollow cross bar (3), a hollow diagonal pole (2), a disc-type scaffold (4), and a connecting fastener (5); the upper part of the second hollow vertical pole (7) is fixed with the disc-type scaffold (4) by welding, and the lower part of the first hollow vertical pole (1) is inserted into the upper part of the second hollow vertical pole (7); the hollow cross bar (3) and the hollow diagonal pole (2) are both welded with the connecting fastener (5) at the end; the hollow cross bar (3) and the hollow diagonal pole (2) are connected by inserting the connecting fastener (5) into the cross bar insertion hole (11) of the disc-type scaffold (4). The first hollow vertical rod (1), the second hollow vertical rod (7), the hollow cross bar (3), and the hollow oblique rod (2) all include an air inlet (6), a first air outlet (9), and a second air outlet (8); the air inlet (6) and the first air outlet (9) are respectively located at two ends of the hollow rod; the air inlet (6), the first air outlet (9), and the second air outlet (8) also include a reinforcing ring (10) arranged at the edge of the hole; the first air outlet (9) and the second air outlet (8) overlap after the first hollow vertical rod (1) is inserted into the second hollow vertical rod (7); The air blowing device comprises an air compressor (12), an air pipe (13), an air nozzle (14), a gas regulating valve (15), a bracket (16), a pressure relief device (17), and a noise suppressor (18); the air compressor (12) is connected to the air pipe (13); the end of the air pipe (13) is provided with an air nozzle (14); the air compressor (12) is arranged on the bracket (16), and the bracket is placed on a scaffolding board adjacent to the scaffolding rod to be tested; the gas regulating valve (15) connects the air pipe (13) and the air nozzle (14); the noise suppressor (18) is installed at the outlet of the air nozzle (14); the pressure relief device (17) is installed on the side of the air nozzle (14); The damage detection module comprises a fixing device, an acoustic wave signal sensor and a signal analysis system (20); the fixing device comprises a magnetic base (21) and an adjustment arm (22); the magnetic base (21) is connected to the adjustment arm (22), and a clamp (23) is arranged at the end of the adjustment arm (22); the acoustic wave signal sensor comprises an acoustic wave sensing element (19) and a signal transmission line (24); the acoustic wave sensing element (19) is connected to the signal transmission line (24), and the acoustic wave sensing element is fixed on the clamp (23) and is in close contact with the rod to be tested.

2. A device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method, characterized in that: The disc-type scaffold damage detection method based on the pneumatic acoustic wave method comprises the following steps: S1: Fix the disc-type scaffolding on the ground; S2: Place the air blowing device near the scaffold to be tested; S3: Detect the ventilation status of the hollow rod of the scaffold to be tested; S4: debug the damage detection module; S5: Use the damage detection module to test the scaffolding to be tested; In the step S1, the lower part of the second hollow vertical pole (7) is inserted into the ground; In step S2, the ambient noise of the air blowing device shall not be higher than 60db, and the change of the ambient noise during the detection period shall not be greater than 20db; In step S3, there should be no debris in the hollow rod; In step S5, the acoustic signal S1(t) of the sensor is recorded at 1 / 3 of the rod, and the acoustic signal S2(t) of the sensor is recorded at 1 / 3 of the rod within 5 minutes. By using the signal difference between adjacent measuring points, the influence of background noise and normal airflow sound is eliminated to extract the damage signal S d (t), calculated by the following formula: S d (t)=S1(t)-S2(t) (1)。 3. According to claim 2, a disc-type scaffolding damage detection device and method based on pneumatic acoustic wave method is characterized in that: The step S1 further comprises the following sub-steps: the lower part of the second hollow vertical pole (7) inserted on the ground is reinforced with a support pad, and the lower part of the second hollow vertical pole (7) passes through the support pad.

4. The device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method according to claim 2 is characterized in that: The step S2 further includes the following sub-step: using a noise suppressor in a high noise environment to reduce the impact of environmental noise on the acoustic sensor.

5. The device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method according to claim 2 is characterized in that: The step S3 also includes the following sub-steps: using high-pressure air to blow out the debris in the hollow rod.

6. The device and method for detecting damage of a disc-type scaffold based on a pneumatic acoustic wave method according to claim 2 is characterized in that: The step S5 further includes the following sub-steps: dividing the signal into multiple time windows, each of which has a length Δt, where Δt can be adjusted. Analyzing the frequency and amplitude characteristics of the signal in each time window, and identifying characteristic signals related to damage by comparing changes in the signals in different time windows.

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