A full-support frame damage acoustic signal monitoring system

Abstract

The utility model discloses a kind of full support damage acoustic signal monitoring systems, it is related to bridge field, including construction ground, building wall is fixed above construction ground, full support is fixedly installed in building wall side, damage acoustic signal monitoring unit is installed in the end of full support away from building wall, the end of damage acoustic signal monitoring unit is electrically connected with display unit, display unit is located on construction ground;The utility model can know that the influence of the connecting mode between waveguide rod and steel pipe to acoustic emission signal by research, the acoustic emission signal waveform form of double-cell black hole coupling agent connecting device is more in line with bridge construction case actual, compared with no black hole direct connection, with the increase of propagation distance, double-cell black hole can reach more than 2.6 times of original, and signal enhancement effect of double-cell black hole is best, smearing 0.02mm coupling agent between waveguide rod and steel pipe in the inside of throat clamp can increase contact area, promote signal transmission, reduce signal loss.

Description

Technical Field

[0001] This utility model relates to the field of bridges, specifically to a full-span scaffolding damage acoustic signal monitoring system. Background Technology

[0002] In bridge construction, full-span scaffolding, as a temporary support structure, is widely used in critical stages such as beam casting and bridge deck construction. Its structural stability directly affects construction safety and project quality. Full-span scaffolding typically consists of vertical, horizontal, vertical, and wall ties connected by fasteners to form a three-dimensional support system. Under construction loads, its own weight, and external environmental factors (such as vibration and wind), the connections between components are prone to loosening, fastener slippage, and member deformation. If such damage is not detected and addressed promptly, it may lead to localized instability or even complete collapse of the scaffolding, causing safety accidents and significant economic losses.

[0003] Traditional methods for monitoring damage to full-span scaffolding rely heavily on manual inspections, using visual observation and wrench checks of fastener tightness to assess structural condition. However, this approach has significant limitations: firstly, manual inspections are inefficient and struggle to cover all critical nodes of the scaffolding, especially for high-density array scaffolding in large bridge projects, where missed inspections are common; secondly, subtle changes in the early stages of damage (such as microcracks or abnormal vibration signals caused by localized stress concentration) are difficult to detect manually, often only being discovered when the damage has progressed to a more severe stage, thus missing the optimal maintenance window.

[0004] With the development of monitoring technology, the existing acoustic black hole waveguide rod wave-inducing technology has been applied to the monitoring of full-span scaffolding for the first time. However, when the existing acoustic signal monitoring device is applied to full-span scaffolding, it faces the following technical challenges: the connection method and arrangement method between the acoustic black hole waveguide rod and the scaffolding steel pipe are not yet clear; the optimal configuration for the propagation of acoustic emission signals in the acoustic black hole waveguide rod, as well as the acoustic emission positioning of a single row of scaffolding and the influence of the number of black holes (single-cell black holes, no black holes, and double-cell black holes) on signal propagation are unclear, making it impossible to confirm the feasibility of applying the acoustic black hole waveguide rod technology to a single row of scaffolding.

[0005] In view of the above, this application provides a full-span scaffold damage acoustic signal monitoring system to solve the problem of insecure clamping. Utility Model Content

[0006] In order to overcome the defects of the prior art, this utility model provides a full-span scaffold damage acoustic signal monitoring system, including a construction ground, a building wall fixed above the construction ground, a full-span scaffold fixedly installed on one side of the building wall, a damage acoustic signal monitoring unit installed at the end of the full-span scaffold away from the building wall, and a display unit connected to the end of the damage acoustic signal monitoring unit, the display unit being located on the construction ground.

[0007] Preferably, the full-span scaffolding includes multiple sets of uprights bolted to the construction ground. These uprights are arranged in a rectangular array on the construction ground. Each row of uprights has multiple sets of horizontal bars connected to one side. These horizontal bars are arranged linearly along the axial direction of the uprights. The uprights and horizontal bars are connected by fasteners. Each column of uprights has multiple sets of longitudinal bars connected to the horizontal bars on one side. These longitudinal bars are arranged linearly along the axial direction of the uprights. The longitudinal bars are connected to the horizontal bars by fasteners. Wall ties bolted to the building wall are symmetrically arranged on both sides of the multiple sets of uprights. These wall ties are connected to the uprights by fasteners.

[0008] Preferably, each pole in contact with the damage acoustic signal monitoring unit is fitted with a hose clamp, which is used to bind the damage acoustic signal monitoring unit to the pole.

[0009] Preferably, the damage acoustic signal monitoring unit includes multiple waveguide rods passing through a hose clamp, the hose clamp binding the waveguide rods to a support rod, one end of each waveguide rod being fixedly connected to a waveguide connector, the multiple waveguide rods being connected to a single waveguide rod via the waveguide connector, a bicellular black hole waveguide rod being fixedly connected to the waveguide connector at one end of the connected waveguide rod, a sensor being fixedly connected to one end of the bicellular black hole waveguide rod, a transmission line being fixedly connected to one end of the sensor, and a display unit being electrically connected to one end of the transmission line.

[0010] Preferably, 0.02mm of coupling agent is applied to the inside of the hose clamp, between the waveguide rod and the upright.

[0011] Preferably, the hose clamp is fixed to the waveguide rod and the upright at an angle of about 30°. To ensure that the tightening force at each fixing point is consistent, it is best to keep five threads exposed outside the fixing bolts of each hose clamp.

[0012] The beneficial effects of the above technical solution are as follows: (1) By studying the influence of the connection method between the waveguide rod and the steel pipe on the acoustic emission signal, this utility model shows that the waveform of the acoustic emission signal of the double-cell black hole coupling agent connection device is more in line with the actual bridge construction case. (2) By applying 0.02mm coupling agent to the inside of the hose clamp, between the waveguide rod and the steel pipe, this utility model can effectively wrap the interface between the two components, increase the contact area, promote signal transmission, and reduce signal loss; (3) Compared with direct connection without black holes, the design of the bicellular black hole in this utility model can achieve more than 2.6 times the original signal enhancement effect as the propagation distance increases; and the bicellular black hole has the best signal enhancement effect. (4) The present invention, through the design of the arc-shaped waveguide rod, enables the waveguide rod to bypass obstacles such as inclined rods and nodes, and directly capture the shear waves and torsional waves in the three-dimensional structure of the support. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a three-dimensional view of the full-span support frame of this utility model; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 This is a schematic diagram of the fastener; Figure 6 Schematic diagram of the installation of the damage acoustic signal monitoring unit; Figure 7 for Figure 6 A partial schematic diagram; Figure 8 This is a schematic diagram of the damage acoustic signal monitoring unit; Figure 9 Schematic diagram of a double-cell black hole waveguide rod; Figure 10 for Figure 7 The front view; Figure 11 for Figure 10 A magnified view of a portion of the image; Figure 12 for Figure 11 A partial sectional view.

[0014] Reference numerals: 1. Construction ground; 2. Building wall; 3. Full-span scaffolding; 4. Damage sound signal monitoring unit; 5. Display unit; 6. Hose clamp; 7. Coupling agent; 31. Upright pole; 32. Horizontal bar; 33. Vertical bar; 34. Wall tie; 35. Fastener; 41. Waveguide rod; 42. Waveguide connector; 43. Twin-cell black hole waveguide rod; 44. Sensor; 45. Transmission line. Detailed Implementation

[0015] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figures 1 to 12 As will be clearly shown in the detailed description of the embodiments, the structural contents mentioned in the following embodiments are all with reference to the accompanying drawings.

[0016] Example 1, such as Figure 1-8 As shown, a full-span scaffold damage acoustic signal monitoring system includes a construction ground 1, a building wall 2 fixed above the construction ground 1, a full-span scaffold 3 fixedly installed on one side of the building wall 2, a damage acoustic signal monitoring unit 4 installed at the end of the full-span scaffold 3 away from the building wall 2, and a display unit 5 electrically connected to the end of the damage acoustic signal monitoring unit 4, the display unit 5 being located on the construction ground 1.

[0017] Specifically, after the full-span scaffold 3 is erected, the damage acoustic signal monitoring unit 4 is fixed to the full-span scaffold 3 using hose clamps 6. The damage acoustic signal monitoring unit 4 is electrically connected to the display unit 5 via transmission line 45. The RS-2A sensor 44 installed in the damage acoustic signal monitoring unit 4 simulates the damage location. The sensor 44 receives the acoustic emission signal transmitted by the waveguide rod 41 in real time and transmits the original signal to the display unit 5 on the construction ground 1 via transmission line 45. The display unit 5 needs to be preset with basic parameter thresholds and automatically generate waveform diagrams. Technicians determine whether the full-span scaffold 3 has loosening, deformation, or other damage by analyzing characteristic parameters such as ring count, energy, amplitude, root mean square value (RMS), and duration.

[0018] Example 2, as Figure 1-5 As shown, a full-span scaffold damage acoustic signal monitoring system includes multiple sets of uprights 31 bolted to the construction ground 1. The multiple sets of uprights 31 are distributed in a rectangular array on the construction ground 1. Each row of uprights 31 is connected to one side of multiple sets of horizontal bars 32. The multiple sets of horizontal bars 32 are linearly arrayed along the axial direction of the uprights 31. The uprights 31 and horizontal bars 32 are connected by fasteners 35. Each row of uprights 31 is provided with multiple sets of vertical bars 33 connected to the horizontal bars 32 on one side. The multiple sets of vertical bars 33 are linearly arrayed along the axial direction of the uprights 31. The vertical bars 33 and horizontal bars 32 are connected by fasteners 35. Wall ties 34 bolted to the building wall 2 are symmetrically arranged on both sides of the multiple sets of uprights 31. The wall ties 34 are connected to the uprights 31 by fasteners 35. Each upright 31 in contact with the damage acoustic signal monitoring unit 4 is fitted with a hose clamp 6. The hose clamp 6 is used to bind the damage acoustic signal monitoring unit 4 to the upright 31.

[0019] Specifically, the uprights 31 of the full-span scaffold 3 are made of φ48mm×3.5mm steel pipes and are fixed to the construction ground 1 with expansion bolts. The spacing between the uprights in the rectangular array is set at 1.2m×1.2m according to the construction specifications. The horizontal bars 32 on one side of each row of uprights 31 are also made of steel pipes of the same specification, and one is set every 1.8m along the axial direction of the uprights. The uprights and horizontal bars are connected by fasteners 35. The longitudinal bars 33 on one side of each column of uprights 31 intersect the horizontal bars 32 perpendicularly and are aligned with the horizontal bars 32 along the axial direction of the uprights. In the first step, the vertical and horizontal bars are connected by right-angle fasteners 35 to form a horizontal grid structure. The wall tie rod 34 is made of φ48mm steel pipe and fixed to the building wall 2 by pre-embedded bolts. The wall tie rod is connected to the upright rod 31 by swivel fasteners 35. The hose clamp 6, which is made of stainless steel, is fitted on the upright rod 31 that is in contact with the damage sound signal monitoring unit 4 to avoid rust affecting the fastening force. The hose clamp must completely wrap around the upright rod 31 and the damage sound signal monitoring unit 4 to complete the fixation of the damage sound signal monitoring unit 4.

[0020] Example 3, as Figure 6-11As shown, a full-span scaffold damage acoustic signal monitoring system includes multiple waveguide rods 41 passing through a hose clamp 6. The hose clamp 6 binds the waveguide rods 41 to the uprights 31. One end of each waveguide rod 41 is fixedly connected to a waveguide connector 42. Multiple waveguide rods 41 are connected into a single waveguide rod via the waveguide connector 42. After connection, a bicellular black hole waveguide rod 43 is fixedly connected to the waveguide connector 42 at one end of the waveguide rod. A sensor 44 is fixedly connected to one end of the bicellular black hole waveguide rod 43. A transmission line 45 is fixedly connected to one end of the sensor 44. A display unit 5 is electrically connected to one end of the transmission line 45.

[0021] Specifically, the waveguide rod 41 in the damage acoustic signal monitoring unit 4 is made of high-strength alloy steel pipe, which has good acoustic signal transmission performance. To adapt to the complex three-dimensional structure of the full-span support 3 and better match the propagation direction of shear waves and torsional waves, reduce signal reflection and scattering losses during propagation, and improve the integrity of signal acquisition, the waveguide rod 41 can be bent into an arc shape according to the positional relationship between the monitoring point and obstacles. The arc design allows the waveguide rod 41 to bypass obstacles such as cross members and fasteners of the support, ensuring that the waveguide rod 41 is in close contact with the monitoring point upright 31, avoiding signal acquisition interruption due to obstruction. Multiple waveguide rods 41 are connected into a whole through waveguide connectors 42. The connectors adopt a bolt connection method, and after connection, the waveguide rods 41 must be able to ensure that the waveguide rods 41 are in close contact with the monitoring point upright 31. 1. Align the axes to avoid signal propagation direction deviation. After connection, the end of the waveguide rod is fixed to the dual-cell black hole waveguide rod 43 through the waveguide connector 42. The dual-cell black hole waveguide rod 43 adopts two concentric gradient cell structures (the inner diameter of the front cell is 8mm, the inner diameter of the rear cell is 5mm, and the length is 30mm) to ensure that the acoustic signal forms a focusing enhancement effect in the cell. The other end of the dual-cell black hole waveguide rod 43 is rigidly connected to the RS-2A model sensor 44 by bolts. The sensor probe must be close to the end of the black hole. The transmission line 45 connected to the output end of the sensor 44 is protected by a corrugated tube to prevent wear during construction. The end of the transmission line is plugged into the display unit 5 through a BNC interface. The interface must be tightened to prevent it from falling off.

[0022] Example 4, as Figure 12 As shown, a full-span stent damage acoustic signal monitoring system includes a 0.02mm coupling agent 7 applied to the inner side of the hose clamp 6, between the waveguide rod 41 and the upright rod 31.

[0023] Specifically, the coupling agent 7 applied to the inner side of the hose clamp 6 and between the waveguide rod 41 and the upright rod 31 is a silicon-based coupling agent. Its acoustic impedance is close to that of steel, which can effectively reduce the reflection loss of the acoustic signal at the interface of different media. Before application, the surfaces of the upright rod 31, the waveguide rod 41 and the inner side of the hose clamp 6 need to be cleaned to remove rust, dust and oil. When applying, use a special micro-application tool to apply evenly along the contact area between the waveguide rod 41 and the upright rod 31. Use a micrometer to ensure that the thickness of the coupling agent 7 is controlled at 0.02mm (error ±0.005mm) to avoid poor contact between the waveguide rod 41 and the upright rod 31 due to excessive thickness, or insufficient filling of tiny gaps due to insufficient thickness. After application, let stand for 1 minute to allow the coupling agent 7 to initially cure before tightening the hose clamp 6, so that the coupling agent 7 fully fills the gap of the contact surface and forms a continuous acoustic signal transmission path. Actual measurements show that it can improve the acoustic signal transmission efficiency by more than 30%.

[0024] Example 5, as Figure 2 and Figure 11 As shown, a full-span scaffold damage acoustic signal monitoring system includes a hose clamp 6 fixed at an angle of approximately 30° to a waveguide rod 41 and a vertical rod 31. To ensure that the tightening force at each fixing point is consistent, it is preferable that the hose clamp 6 maintains five exposed threads outside the fixing bolts.

[0025] Specifically, the hose clamp 6 is fixed at a 30° angle to the waveguide rod 41 and the upright rod 31. This angle was determined through experiments: at this angle, the contact area between the waveguide rod and the upright rod is the largest (25% larger than 0° or right angle contact), and the propagation direction of the acoustic signal in the waveguide rod is closer to the axial direction, reducing signal scattering loss caused by angle deviation. Then, the number of exposed bolt threads is adjusted until 5 complete bolt threads are exposed outside the fixing bolt. At this time, the tightening force is checked with a torque wrench to ensure that the tightening torque of each hose clamp is consistent, avoiding local looseness that leads to unstable signal transmission, or excessive tightness that causes deformation of the waveguide rod. After fixing, the bolt positions need to be marked, and the number of exposed bolt threads and the tightening force need to be checked regularly to prevent loosening caused by construction vibration and to ensure the stability of signal transmission during long-term monitoring.

[0026] Working principle of a full-span scaffold damage acoustic signal monitoring system: (Reference) Figure 1-11When using this utility model, firstly, a full-span scaffold 3 is erected according to construction specifications: multiple sets of uprights 31 are fixed to the construction ground 1 with bolts, arranged in a rectangular array. Each row of uprights 31 has a horizontal bar 32 connected to one side along the axial direction via fasteners 35, and each column of uprights 31 has a vertical bar 33 connected to one side via fasteners 35, forming a horizontal grid structure. Wall ties 34 are symmetrically arranged on both sides of the uprights 31, one end of which is bolted to the building wall 2, and the other end is connected to the upright via fasteners 35, enhancing the overall stability of the scaffold. After erection, the tightness of all fasteners is checked to ensure the scaffold structure is secure. Next, the damage acoustic signal monitoring unit 4 is assembled: multiple high-strength alloy waveguide rods 41 are connected as a whole via waveguide connectors 42. After connection, the ends of the waveguide rods are connected via waveguides... Connector 42 fixes the bicellular black hole waveguide rod 43. The other end of the bicellular black hole waveguide rod 43 is connected to an RS-2A sensor 44. The end of the sensor 44 is connected to a transmission line 45, completing the overall assembly of the device. Then, a stainless steel hose clamp 6 is fitted onto the upright rod 31 of the key monitoring point of the full-span support 3. The waveguide rod 41 of the assembled damage acoustic signal monitoring unit 4 is passed through the hose clamp. In order to adapt to the three-dimensional complex structure of the full-span support 3 and better match the propagation direction of shear waves and torsional waves, reduce the reflection and scattering loss of signals during propagation, and improve the integrity of signal acquisition, the waveguide rod 41 can be bent into an arc shape according to the positional relationship between the monitoring point and the obstacle. The arc design allows the waveguide rod 41 to bypass obstacles such as cross rods and fasteners of the support. Ensure the waveguide rod 41 is in close contact with the monitoring point pole 31 to avoid signal acquisition interruption due to obstruction. The hose clamp 6 is fixed at a 30° angle to the waveguide rod 41 and the pole 31. Before fixing, apply a 0.02mm thick silicon-based coupling agent 7 evenly to the inside of the hose clamp 6 and between the waveguide rod 41 and the pole 31 to fill the gaps in the contact surfaces. Adjust the fixing bolts of the hose clamp 6 to ensure that five threads are exposed on the outside of the bolts, ensuring consistent tightening force at each fixing point and guaranteeing a tight fit between the waveguide rod 41 and the pole 31. Electrically connect the end of the transmission line 45 of the damage sound signal monitoring unit 4 to the display unit 5 on the construction ground 1 via a BNC interface. Tighten the interface to prevent it from falling off. Protect the transmission line with a corrugated tube to prevent signal interruption due to construction wear, ensuring the sensor 4... The signal transmission between the 4th and the display unit 5 is stable. During the monitoring process, the acoustic emission signal generated by the damage to the full-span support 3 (such as loose fasteners or deformed rods) is transmitted to the waveguide rod 41 through the upright 31. After the arc-shaped waveguide rod adapts to the propagation direction of shear waves and torsional waves, the signal is focused and enhanced by the double-cell black hole waveguide rod 43 (the propagation distance is increased by more than 2.6 times compared with the connection without black holes). The signal is then received by the sensor 44 and converted into an electrical signal, which is transmitted to the display unit 5 through the transmission line 45. The monitoring system automatically generates a waveform diagram. Technicians combine the characteristic parameters such as ring count, energy, amplitude, root mean square value (RMS) and duration to comprehensively judge whether there is damage to the support and the degree of damage, so as to realize the real-time monitoring of the structural stability of the full-span support.

[0027] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A full-span scaffolding damage acoustic signal monitoring system, comprising a construction ground (1), characterized in that, A building wall (2) is fixed above the construction ground (1). A full-span support (3) is fixedly installed on one side of the building wall (2). A damage sound signal monitoring unit (4) is installed at the end of the full-span support (3) away from the building wall (2). A display unit (5) is electrically connected to the end of the damage sound signal monitoring unit (4). The display unit (5) is located on the construction ground (1).

2. The full-span scaffold damage acoustic signal monitoring system according to claim 1, characterized in that, The full-span scaffold (3) includes multiple sets of uprights (31) bolted to the construction ground (1). The multiple sets of uprights (31) are arranged in a rectangular array on the construction ground (1). Each row of uprights (31) is connected to one side of multiple sets of horizontal bars (32). The multiple sets of horizontal bars (32) are arranged linearly along the axial direction of the uprights (31). The uprights (31) and horizontal bars (32) are connected by fasteners (35). Each row of uprights (31) is provided with multiple sets of longitudinal bars (33) connected to the horizontal bars (32) on one side. The multiple sets of longitudinal bars (33) are arranged linearly along the axial direction of the uprights (31). The longitudinal bars (33) and horizontal bars (32) are connected by fasteners (35). The multiple sets of uprights (31) are symmetrically provided with wall ties (34) bolted to the building wall (2) on both sides. The wall ties (34) are connected to the uprights (31) by fasteners (35).

3. The full-span scaffold damage acoustic signal monitoring system according to claim 2, characterized in that, Each pole (31) in contact with the damage sound signal monitoring unit (4) is fitted with a hose clamp (6), which is used to bind the damage sound signal monitoring unit (4) to the pole (31).

4. The full-span scaffold damage acoustic signal monitoring system according to claim 3, characterized in that, The damage acoustic signal monitoring unit (4) includes multiple waveguide rods (41) passing through a hose clamp (6). The hose clamp (6) binds the waveguide rods (41) to the upright rod (31). One end of the waveguide rod (41) is fixedly connected to a waveguide connector (42). Multiple waveguide rods (41) are connected into a single waveguide rod through the waveguide connector (42). The waveguide connector (42) at one end of the connected waveguide rod is fixedly connected to a bicellular black hole waveguide rod (43). One end of the bicellular black hole waveguide rod (43) is fixedly connected to a sensor (44). One end of the sensor (44) is fixedly connected to a transmission line (45). One end of the transmission line (45) is electrically connected to a display unit (5).

5. The full-span scaffold damage acoustic signal monitoring system according to claim 4, characterized in that, Apply 0.02mm of coupling agent (7) to the inside of the hose clamp (6), between the waveguide rod (41) and the upright rod (31).

6. The full-span scaffold damage acoustic signal monitoring system according to claim 4, characterized in that, The hose clamp (6) is fixed to the waveguide rod (41) and the upright rod (31) at an angle of about 30°. In order to ensure that the fastening force of each fixing point is consistent, it is best to keep the hose clamp (6) with five threads exposed outside the fixing bolt.

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