A method for detecting the internal structure of a bridge

Abstract

The application discloses a kind of bridge internal structure detection method applied to bridge detection field, the method is placed on the connecting place of two box girder upper and lower detector, when box girder is vibrated up and down, two detection plates extrude each other and let touch pressure head trigger pressure sensor, the pressure value and the pressure times that pressure sensor receives are transmitted to background monitoring system by data line, the amplitude of vibration can be analyzed by pressure value, the frequency of vibration can be analyzed by pressure times, when box girder is vibrated left and right, two detection plates are misaligned and move, let the power circuit of the two flat power lines formed is broken, the amplitude and frequency of left and right vibration of box girder can be analyzed by the number of flat power lines of broken circuit and the time of re-circuit after broken, to facilitate the evaluation and prediction of the structural stability of bridge, realize the detection of bridge vibration amplitude and frequency, not only can long-time monitoring to obtain more comprehensive data, but also save the trouble of manual operation.

Description

Technical Field

[0001] This application relates to the field of road and bridge inspection, and in particular to a method for inspecting the internal structure of roads and bridges. Background Technology

[0002] Bridges inevitably suffer various structural damages during long-term use. Bridge inspection is to assess bridges based on their actual conditions. Through comprehensive, detailed, and in-depth on-site inspection of the bridge's usage status, defects, and damage, the nature, location, severity, and development trend of defects and damage are identified, and the causes of defects and damage are found. This allows for the analysis and evaluation of the impact of defects and damage on the bridge's performance and load-bearing capacity, providing timely and targeted first-hand information for bridge maintenance, reinforcement, and reconstruction design.

[0003] The most vulnerable point on a bridge is the connection between two box girders, especially when heavily loaded trucks pass by, causing significant vibration between the two girders. This is a key area for bridge structural inspection. Currently, most inspection methods cannot effectively detect bridge vibration under load. Even those that can often rely on manual operation with equipment on a normally functioning bridge surface. This undoubtedly increases the safety risks for inspectors and prevents prolonged operation, resulting in incomplete data.

[0004] Therefore, we use this technical solution to address the problem that existing detection methods cannot effectively detect bridges that are in normal traffic. Summary of the Invention

[0005] The purpose of this application is to improve existing bridge structure inspection methods and provide a method for inspecting the internal structure of a road and bridge. This method involves placing detectors at the connection point of two box girders, with the detection plates of the two detectors stacked vertically. When the box girder vibrates vertically, the two detection plates press against each other, triggering pressure sensors. The pressure values ​​and pressure cycles received by the pressure sensors are transmitted to a back-end monitoring system via data lines. The vibration amplitude can be analyzed from the pressure values, and the vibration frequency can be analyzed from the pressure cycles. When the box girder vibrates horizontally, the two detection plates shift out of position, causing the electrical circuit formed by the two flat conductive wires to break. The amplitude and frequency of the horizontal vibration of the box girder can be analyzed by the number of broken flat conductive wires and the time it takes for the circuit to reconnect. This facilitates the assessment and prediction of the structural stability of the bridge.

[0006] The ability to detect the amplitude and frequency of bridge vibrations not only allows for long-term monitoring to obtain more comprehensive data, but also eliminates the hassle of manual labor.

[0007] Furthermore, in step S1, the detector includes a mounting box. A detection plate is fixedly connected to the center of the mounting box, and two opposing detection plates are stacked one on top of the other. Rubber bladders are fixedly connected to both the upper and lower sides of the detection plates, and latex meshes are fixedly connected to the upper and lower sidewalls of the detection plates inside the rubber bladders. A contact head is fixedly connected to the end of the latex mesh away from the detection plate, and a pressure sensor is installed on the inner wall of the detection plate facing the contact head. The pressure sensor is electrically connected to a remote data transmission device via a data cable. Multiple flat conductive wires are fixedly embedded on the contact side of the two detection plates. Insulation boxes are fixedly connected to both sides of the mounting box on both sides of the detection plates. One insulation box contains a power supply that is electrically connected to the multiple flat conductive wires, and the opposite insulation box contains a terminal block connected to the power supply via wires. A current detection box is installed on the side of the insulation box closest to the terminal block, and multiple energized nodes are installed on the current detection box. Each energized node is connected to a flat conductive wire. The current detection box contains multiple current detection devices electrically connected to the energized nodes, and these devices are electrically connected to a remote data transmission device via data cables. A terminal block is electrically connected to the multiple energized nodes. Two stacked detection plates allow the flat conductive wires on top of each other to conduct electricity. This allows the current from the power supply to form a circuit after passing through the two contacting flat conductive wires and the terminal block. When the two box girders shift, the two flat conductive wires simultaneously shift, thus preventing the formation of a circuit. The current detection devices detect the absence of current and analyze the amplitude and frequency of the box girder vibration based on the location of the current-free circuit and the time before and after the circuit is re-established. The energized nodes serve as the connection points between the flat conductive wires and the terminal block, and they also facilitate the measurement of whether current flows through the flat conductive wires.

[0008] Furthermore, the background monitoring system includes a pressure count calculation module and a pressure value calculation module electrically connected to the pressure sensor. The background monitoring system also includes a current point position coordinate module electrically connected to the current detection device. The pressure count calculation module calculates the number of times the pressure sensor is subjected to pressure, and thus the frequency of the box girder's vertical vibration per unit time can be calculated based on the number of times. The pressure value calculation module calculates the pressure value that the pressure sensor is subjected to each time, and thus the amplitude of the box girder's vertical vibration can be calculated. The larger the pressure value, the greater the vibration amplitude.

[0009] Optionally, the detection plate includes a flexible insulating sleeve, and an elastic plate is fixedly embedded in the inner wall of the middle part of the flexible insulating sleeve. The flexible insulating sleeve plays an insulating role to prevent current leakage from the flat conductive wire, while the elastic plate gives the detection plate resilience.

[0010] Furthermore, the two flat conductive wires that are in contact with each other form a power circuit with the power supply and the terminal block. Multiple sets of flat conductive wires are connected in parallel, and each set of flat conductive wires forms a power circuit with the power supply and the terminal block. This way, if the flat conductive wires of other sets are disconnected, it will not affect the other circuits.

[0011] Furthermore, the rubber bladder is also fixedly connected to multiple symmetrically distributed elastic rods, which are made of polyurethane elastic material. The elastic rods rely on their elasticity to further protect the pressure sensor and effectively prevent the pressure sensor from being excessively squeezed by the pressure head.

[0012] Furthermore, a distance sensor is installed at one end of each of the two detection plates. The background monitoring system includes an alarm module, and the distance sensor is electrically connected to the alarm module via a data cable. The distance sensor is used to detect the expansion and contraction of the two box girders. When the distance between the two box girders is too large, the distance sensor triggers the alarm module to provide early warning of dangerous situations and effectively reduce the occurrence of accidents.

[0013] Compared to existing technologies, the advantages of this application are:

[0014] (1) This scheme involves placing detectors at the connection between two box girders. The detection plates of the two detectors are stacked one on top of the other. When the box girder vibrates vertically, the two detection plates press against each other, causing the pressure head to trigger the pressure sensor. The pressure value and the number of pressures received by the pressure sensor are transmitted to the background monitoring system via a data line. The vibration amplitude can be analyzed by the pressure value, and the vibration frequency can be analyzed by the number of pressures. When the box girder vibrates horizontally, the two detection plates move out of alignment. The misalignment of the detection plates breaks the circuit formed by the two flat conductive wires. The amplitude and frequency of the horizontal vibration of the box girder can be analyzed by the number of flat conductive wires that are broken and the time it takes for the circuit to reconnect after the break. This facilitates the assessment and prediction of the structural stability of the bridge and enables the detection of the vibration amplitude and frequency of the bridge. It not only allows for long-term monitoring to obtain more comprehensive data, but also saves the trouble of manual operation.

[0015] (2) In step S1, the detector includes a mounting box. A detection plate is fixedly connected to the middle of the mounting box, and two opposing detection plates are stacked one on top of the other. Rubber bladders are fixedly connected to both the upper and lower sides of the detection plates, and latex meshes are fixedly connected to the upper and lower sidewalls of the detection plates inside the rubber bladders. A contact head is fixedly connected to the end of the latex mesh away from the detection plate, and a pressure sensor is installed on the inner wall of the detection plate facing the contact head. The pressure sensor is electrically connected to a remote data transmission device via a data cable. Multiple flat conductive wires are fixedly embedded on the side of the two contacting detection plates. Insulation boxes are fixedly connected to both sides of the mounting box on the detection plates. One of the insulation boxes contains a power supply that is electrically connected to the multiple flat conductive wires, and the opposite insulation box contains a terminal block. The terminal block is connected to the power supply via wires. A current detection box is installed on the side of the insulation box near the terminal block. The current detection box has multiple energized nodes, and each Each energized node is connected to a flat conductive wire. The current detection box contains multiple current detection devices electrically connected to the energized nodes, and these devices are electrically connected to a remote data transmission device via data cables. A terminal block is electrically connected to the multiple energized nodes. Two stacked detection plates allow the flat conductive wires on them to conduct electricity. Thus, current from the power supply forms a circuit after passing through the two contacting flat conductive wires and the terminal block. When the two box girders shift, the two flat conductive wires simultaneously shift, preventing the formation of a circuit. The current detection devices detect the absence of current and analyze the amplitude and frequency of the box girder vibration based on the location of the current-free circuit and the time before and after the circuit is re-established. The energized nodes serve as the connection points between the flat conductive wires and the terminal block, and they also facilitate the measurement of whether current flows through the flat conductive wires.

[0016] (3) The background monitoring system includes a pressure count calculation module and a pressure value calculation module that are electrically connected to the pressure sensor. The background monitoring system also includes a current point position coordinate module that is electrically connected to the current detection device. The pressure count calculation module calculates the number of pressures received by the pressure sensor. Based on the number of pressures, the frequency of the box girder's vertical vibration per unit time can be calculated. The pressure value calculation module calculates the pressure value received by the pressure sensor each time. Based on this, the amplitude of the box girder's vertical vibration can be calculated. The larger the pressure value, the greater the vibration amplitude.

[0017] (4) The test plate includes a flexible insulating sleeve, and an elastic plate is fixedly embedded in the inner wall of the middle part of the flexible insulating sleeve. The flexible insulating sleeve plays an insulating role to prevent the current from leaking out of the flat conductive wire, while the elastic plate gives the test plate resilience.

[0018] (5) Two flat wires in contact with each other form a power circuit with the power supply and the terminal block. Multiple sets of flat wires are connected in parallel. Each set of flat wires forms a power circuit with the power supply and the terminal block. This way, if other sets of flat wires are disconnected, it will not affect other circuits.

[0019] (6) The inside of the rubber bladder is also fixedly connected with multiple symmetrically distributed elastic rods, and the elastic rods are made of polyurethane elastic material. The elastic rods rely on elasticity to further protect the pressure sensor and effectively prevent the pressure sensor from being excessively squeezed by the pressure head.

[0020] (7) A distance sensor is installed at one end of each of the two detection plates. The background monitoring system includes an alarm module, and the distance sensor is electrically connected to the alarm module via a data cable. The distance sensor is used to detect the expansion and contraction of the two box girders. When the distance between the two box girders is too large, the distance sensor will trigger the alarm module to provide early warning of dangerous situations and effectively reduce the occurrence of accidents. Attached Figure Description

[0021] Figure 1 This is an installation diagram for this application;

[0022] Figure 2 This is a three-dimensional view of the detector in this application;

[0023] Figure 3 This is a schematic diagram of the connection of the detector in this application;

[0024] Figure 4 This is a cross-sectional view of the test plate in this application;

[0025] Figure 5 This is a top view of the testing plate of this application;

[0026] Figure 6 This is a top view of the test plate of the box girder in this application before lateral vibration;

[0027] Figure 7 This is a diagram showing the internal structure of the insulation box in this application;

[0028] Figure 8 This is a pictogram of the box girder of this application under vertical vibration.

[0029] Figure 9 This is a top view of the detection plate for the box girder of this application during lateral vibration.

[0030] Figure 10 This is a pictogram of the box girder in this application during expansion and contraction.

[0031] Explanation of the labels in the diagram:

[0032] 1. Installation box, 101. Insulation box, 2. Detection board, 201. Flexible insulation board sleeve, 202. Elastic board, 3. Rubber bladder, 301. Elastic rod, 4. Latex mesh, 5. Contact head, 6. Pressure sensor, 7. Flat power cable, 8. Power supply, 9. Terminal block, 10. Current detection box, 11. Power connection node, 12. Distance sensor. Detailed Implementation

[0033] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0034] Example 1:

[0035] A method for inspecting the internal structure of a road or bridge includes the following inspection steps:

[0036] S1. First, install the two detectors at the connection of the two box girders respectively, then connect the two detectors to the power supply, and then connect the detectors to the remote data transmission device through the data cable.

[0037] S2. The data detected by the detector is transmitted to the background monitoring system in real time through the remote data transmission device. The data detected by the detector includes the frequency and amplitude of the bridge's vertical and horizontal vibrations. Under normal bridge conditions, the background monitoring system converts the received data into a line graph through a converter.

[0038] S3. By analyzing the state of the bridge under different loads using line graphs, the stability of the bridge's internal structure can be studied.

[0039] Please see Figure 1 , 2 3 and Figure 8 In step S1, the detector includes a mounting box 1. A detection plate 2 is fixedly connected to the middle of the mounting box 1, and two opposite detection plates 2 are stacked one on top of the other. Rubber bladders 3 are fixedly connected to both the upper and lower sides of the detection plate 2, and latex mesh 4 is fixedly connected to the upper and lower side walls of the detection plate 2 inside the rubber bladder 3. A pressure head 5 is fixedly connected to the end of the latex mesh 4 away from the detection plate 2, and a pressure sensor 6 is installed on the inner wall of the detection plate 2 facing the pressure head 5. The pressure sensor 6 is electrically connected to a remote data transmission device through a data cable.

[0040] Please see Figure 5 , 6 and Figure 7On the side where the two detection plates 2 are in contact, multiple flat conductive wires 7 are fixedly embedded. An insulating box 101 is fixedly connected to both sides of the mounting box 1 on the detection plates 2. One insulating box 101 contains a power supply 8 electrically connected to the multiple flat conductive wires 7, and the opposite insulating box 101 contains a terminal block 9 connected to the power supply 8 via wires. A current detection box 10 is installed on the side of the insulating box 101 closest to the terminal block 9. Multiple energized nodes 11 are installed on the current detection box 10, and each energized node 11 is connected to a flat conductive wire 7. Multiple current detection devices are installed inside the current detection box 10, electrically connected to the energized nodes 11, and these current detection devices are electrically connected to a remote data transmission device via data cables. The terminal block 9 is electrically connected to multiple energized nodes 11. The two stacked detection plates 2 allow the flat conductive wires 7 on each other to conduct electricity. In this way, the current on the power supply 8 can form an electrical circuit after passing through the two contacting flat conductive wires 7 and the terminal block 9. When the two box girders are misaligned, the two flat conductive wires 7 are simultaneously misaligned. The misaligned flat conductive wires 7 no longer form an electrical circuit, and are thus detected by the current detection device as having no current passing through them. The amplitude and frequency of the box girder vibration are analyzed and studied based on the location of the circuit without current and the time before and after the circuit is re-established. The energized node 11 serves as the connection point between the flat conductive wire 7 and the terminal block 9, and the energized node 11 is also for the convenience of measuring whether there is current passing through the flat conductive wire 7.

[0041] The background monitoring system includes a pressure count calculation module and a pressure value calculation module electrically connected to the pressure sensor 6. The background monitoring system also includes a current point position coordinate module electrically connected to the current detection device. The pressure count calculation module calculates the number of times the pressure sensor 6 is subjected to pressure. Based on the number of times, the frequency of the box girder's vertical vibration per unit time can be calculated. The pressure value calculation module calculates the pressure value that the pressure sensor 6 is subjected to each time. Based on this, the amplitude of the box girder's vertical vibration can be calculated. The larger the pressure value, the greater the vibration amplitude.

[0042] Example 2:

[0043] Based on Example 1, please refer to Figure 4 , 5 and Figure 10The detection plate 2 includes a flexible insulating sleeve 201, and an elastic plate 202 is fixedly embedded in the inner wall of the middle part of the flexible insulating sleeve 201. The flexible insulating sleeve 201 plays an insulating role to prevent current leakage from the flat conductive wire 7, while the elastic plate 202 gives the detection plate 2 resilience. A distance sensor 12 is installed at one end of each of the two detection plates 2. The background monitoring system includes an alarm module, and the distance sensor 12 is electrically connected to the alarm module through a data cable. The distance sensor 12 is used to detect the expansion and contraction of the two box beams. When the distance between the two box beams is too large, the distance sensor 12 triggers the alarm module to provide early warning of dangerous situations and effectively reduce the occurrence of accidents.

[0044] Please see Figure 6 , 7 and Figure 9 Two flat conductive wires 7 in contact with each other form a power circuit with the power supply 8 and the terminal block 9. Multiple sets of flat conductive wires 7 are connected in parallel. Each set of flat conductive wires 7 forms a power circuit with the power supply 8 and the terminal block 9. This way, if other sets of flat conductive wires 7 are disconnected, it will not affect other circuits. The rubber bladder 3 is also fixedly connected with multiple symmetrically distributed elastic rods 301. The elastic rods 301 are made of polyurethane elastic material. The elastic rods 301 rely on elasticity to further protect the pressure sensor 6 and effectively prevent the pressure sensor 6 from being excessively squeezed by the pressure head 5.

[0045] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A method for inspecting the internal structure of a road or bridge, characterized in that, The following testing steps are included: S1. First, install two detectors at the connection of two box girders. The detector includes a mounting box (1). A detection plate (2) is fixedly connected to the middle of the mounting box (1), and the two detection plates (2) are stacked on top of each other. Rubber bladders (3) are fixedly connected to the upper and lower sides of the detection plate (2), and latex mesh (4) is fixedly connected to the upper and lower side walls of the detection plate (2) inside the rubber bladder (3). A pressure head (5) is fixedly connected to the end of the latex mesh (4) away from the detection plate (2), and a pressure sensor (6) is installed on the inner wall of the detection plate (2) facing the pressure head (5). The pressure sensor (6) is electrically connected to a remote data transmission device through a data cable. Multiple flat conductive wires (7) are fixedly embedded on the side of the two detection plates (2) that are in contact with each other. Insulation boxes (10) are fixedly connected to both sides of the mounting box (1) on the detection plate (2). 1) One of the insulation boxes (101) is equipped with a power supply (8) that is electrically connected to multiple flat conductive wires (7), and the opposite insulation box (101) is equipped with a terminal block (9). The terminal block (9) is connected to the power supply (8) through a wire. A current detection box (10) is installed on the side of the insulation box (101) near the terminal block (9). Multiple energized nodes (11) are installed on the current detection box (10), and each energized node (11) is connected to a flat conductive wire (7). Multiple current detection devices that are electrically connected to the energized nodes (11) are installed inside the current detection box (10), and the current detection devices are electrically connected to a remote data transmission device through a data line. The terminal block (9) and the multiple energized nodes (11) are electrically connected, and then the two detectors are connected and energized, and then the detectors are connected to the remote data transmission device through a data line. S2. The data detected by the detector is transmitted to the background monitoring system in real time through the remote data transmission device. The data detected by the detector includes the frequency and amplitude of the bridge's vertical and horizontal vibrations. Under normal bridge conditions, the background monitoring system converts the received data into a line graph through a converter. S3. By analyzing the state of the bridge under different loads using line graphs, the stability of the bridge's internal structure can be studied.

2. The method for detecting the internal structure of a road or bridge according to claim 1, characterized in that, The background monitoring system includes a pressure count calculation module and a pressure value calculation module electrically connected to the pressure sensor (6). The background monitoring system also includes a current point position coordinate module electrically connected to the current detection device.

3. The method for detecting the internal structure of a road or bridge according to claim 1, characterized in that, The detection plate (2) includes a flexible insulating sleeve (201), and an elastic plate (202) is fixedly embedded in the inner wall of the middle part of the flexible insulating sleeve (201).

4. The method for detecting the internal structure of a road or bridge according to claim 1, characterized in that, Two flat conductive wires (7) that are in contact with each other form a circuit with the power supply (8) and the terminal block (9), and multiple sets of flat conductive wires (7) are connected in parallel.

5. The method for detecting the internal structure of a road or bridge according to claim 1, characterized in that, The rubber bladder (3) is also fixedly connected to a number of symmetrically distributed elastic rods (301), and the elastic rods (301) are made of polyurethane elastic material.

6. The method for detecting the internal structure of a road or bridge according to claim 1, characterized in that, Distance sensors (12) are installed at one end of both detection boards (2). The background monitoring system includes an alarm module, and the distance sensors (12) are electrically connected to the alarm module via a data cable.

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