Bridge displacement monitoring system and method based on pull rod angle displacement meter

Abstract

The invention discloses a bridge displacement monitoring system and method based on a pull rod angle displacement meter. The system comprises the pull rod angle displacement meter, an edge computing gateway and a remote processing terminal, wherein the pull rod angle displacement meter and the edge computing gateway are deployed on a bridge site, and the remote processing terminal is connected with the edge computing gateway through a network. The pull rod angle displacement meter comprises a pull rod type displacement meter for monitoring the displacement change of the pull rod and an angle measuring ring for monitoring the angle change of the pull rod; the pull rod displacement change and pull rod angle change data monitored by the pull rod angle displacement meter are transmitted to a remote processing terminal through an edge computing gateway; and performing trigonometric function calculation processing on the obtained pull rod displacement change and pull rod angle change data through the remote processing terminal to obtain relative displacement data between the bridge deck and the bridge pier. The problem that the relative displacement value of the bridge floor cannot be accurately obtained due to the fact that absolute levelness or perpendicularity cannot be guaranteed when a traditional pull rod type displacement meter is installed is solved, and the measurement precision and reliability are greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge displacement monitoring, and in particular to a bridge displacement monitoring system and method based on a tie rod angle displacement meter. Background Art

[0002] In the health monitoring system of bridges, tie-rod displacement meters can be installed at bridge piers, bridge spans and other locations to monitor in real time the displacement of bridges under the influence of vehicle loads, wind loads, temperature changes and other factors. If the displacement exceeds a certain threshold, an early warning can be issued in time and corresponding maintenance measures can be taken. However, at present, tie-rod displacement meters can only measure the distance change in the direction of the tie rod. Since the tie-rod displacement meter cannot accurately ensure that its installation position is absolutely horizontal or vertical in actual application scenarios, it is impossible to accurately obtain the horizontal or vertical displacement value of the bridge deck, resulting in the inability to accurately analyze the relative displacement between the bridge deck and the bridge piers, such as horizontal movement or torsion or overturning. Summary of the invention

[0003] The present application provides a bridge displacement monitoring system and method based on a tie rod angle displacement meter, so as to solve the problem that a single tie rod displacement meter cannot accurately obtain the relative displacement between the bridge deck and the bridge pier.

[0004] According to the first aspect, an embodiment provides a bridge displacement monitoring system based on a tie rod angle displacement meter, the system comprising a tie rod angle displacement meter and an edge computing gateway deployed at a bridge site, and a remote processing terminal connected to the edge computing gateway via a network; The tie rod angle displacement meter comprises a tie rod displacement meter for monitoring the change of tie rod displacement and an angle measuring ring for monitoring the change of tie rod angle, one end of the tie rod displacement meter is a retractable end and the other end is a fixed end, the retractable end is connected to the bridge deck, the fixed end is connected to the bridge pier, and the angle measuring ring is arranged at the fixed end; The edge computing gateway is used to transmit the pull rod displacement change and pull rod angle change data monitored by the pull rod angle displacement meter to the remote processing terminal; The remote processing terminal is used to perform trigonometric calculation on the acquired pull rod displacement change and pull rod angle change data to obtain relative displacement data between the bridge deck and the bridge pier.

[0005] Furthermore, the pull-rod displacement meter comprises a retractable pull-rod arranged in a housing and a reset spring connected to the pull-rod, and the pull-rod displacement meter has a built-in LVDT linear displacement sensor.

[0006] Furthermore, the angle measuring ring is equipped with an angle sensor.

[0007] Furthermore, the pull rod angle displacement meter also includes a digital module and a power supply module, the LVDT linear displacement sensor and the angle sensor are both connected to the digital module, and the digital module is connected to the edge computing gateway.

[0008] Furthermore, the obtained pull rod displacement change and pull rod angle change data are processed by trigonometric calculation to obtain the relative displacement data between the bridge deck and the bridge pier, specifically including: Assuming that the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge deck relative to the pier is for: .

[0009] Furthermore, the system also includes a solar panel, which is fixed under the bridge pier or the bridge deck and is used to power the edge computing gateway.

[0010] Furthermore, the edge computing gateway transmits data with the remote processing terminal via ZigBee and 4G / 5G networks.

[0011] Furthermore, the remote processing terminal is specifically used to perform statistical analysis on the horizontal displacement of the bridge deck relative to the bridge piers in different monitoring periods, and to use a visualization platform to visualize the analysis data, so as to intuitively display the changing trend of the horizontal displacement of the bridge deck relative to the bridge piers.

[0012] According to the second aspect, an embodiment provides a bridge displacement monitoring method based on a tie rod angle displacement meter, the method comprising: Deploy a tie rod angle displacement meter and an edge computing gateway at the bridge site, wherein the tie rod angle displacement meter includes a tie rod type displacement meter for monitoring the change of tie rod displacement and an angle measurement ring for monitoring the change of tie rod angle, wherein one end of the tie rod type displacement meter is a retractable end and the other end is a fixed end, wherein the retractable end is connected to the bridge deck, and the fixed end is connected to the bridge pier, and the angle measurement ring is arranged at the fixed end; Debug the equipment and network, calibrate the initial value of the tie rod angle displacement meter and start monitoring, and transmit the tie rod displacement change and tie rod angle change data monitored by the tie rod angle displacement meter to the remote processing terminal through the edge computing gateway; The obtained tie rod displacement change and tie rod angle change data are processed by trigonometric calculation through the remote processing terminal to obtain the relative displacement data between the bridge deck and the bridge pier.

[0013] Furthermore, the obtained pull rod displacement change and pull rod angle change data are processed by trigonometric calculation to obtain the relative displacement data between the bridge deck and the bridge pier, specifically including: Assuming that the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge deck relative to the pier is for: .

[0014] The present application provides a bridge displacement monitoring system and method based on a tie rod angle displacement meter, which has the following beneficial effects: (1) By adding an angle measurement ring to the rod-type displacement meter, the problem of the inability to accurately obtain the relative displacement value of the bridge deck due to the inability to ensure absolute horizontality or verticality during the installation of the rod-type displacement meter is avoided, which significantly improves the comprehensiveness and accuracy of the measurement; (2) It not only solves the strict restrictions on installation position and direction of traditional pull-rod displacement meters, but also reduces equipment cost and complexity, avoids the data fusion and calibration problems caused by the combination of multiple sensors, greatly improves the measurement accuracy and reliability, and provides more powerful support for bridge safety monitoring; (3) The real-time and stability of monitoring data are guaranteed through optimized data processing and transmission processes, providing timely, accurate and highly valuable displacement information for bridge maintenance and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a bridge displacement monitoring system based on a tie rod angle displacement meter provided in one embodiment of the present application; Figure 2 A schematic diagram of the structure of a tie rod angle displacement meter in a bridge displacement monitoring system based on a tie rod angle displacement meter provided in one embodiment of the present application; Figure 3 A schematic diagram of the internal structure of a tie rod angle displacement meter in a bridge displacement monitoring system based on a tie rod angle displacement meter provided in one embodiment of the present application; Figure 4 A schematic diagram of the operation flow of a bridge displacement monitoring system based on a tie rod angle displacement meter provided in one embodiment of the present application; Figure 5 A schematic diagram of trigonometric function calculation relationships of a bridge displacement monitoring system based on a tie rod angle displacement meter provided in one embodiment of the present application.

[0016] Among them: 10-pull rod angle displacement meter; 20-edge computing gateway; 30-remote processing terminal; 40-solar panel; 50-bridge deck; 60-bridge pier; 11-pull rod displacement meter; 12-angle measuring ring; 111-pull rod; 112-reset spring; 113-digital module and power supply module. DETAILED DESCRIPTION

[0017] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0018] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0019] The first embodiment of the present application provides a bridge displacement monitoring system based on a tie rod angle displacement meter, such as Figure 1 As shown, the system includes a tie rod angle displacement meter 10 and an edge computing gateway 20 deployed at the bridge site, and a remote processing terminal 30 connected to the edge computing gateway 20 via a network.

[0020] like Figure 2 and Figure 3 As shown, the tie rod angle displacement meter 10 includes a tie rod type displacement meter 11 for monitoring the change of tie rod displacement and an angle measuring ring 12 for monitoring the change of tie rod angle. One end of the tie rod type displacement meter 11 is a retractable end and the other end is a fixed end. The retractable end is connected to the bridge deck 50, and the fixed end is connected to the bridge pier 60. The angle measuring ring 12 is arranged at the fixed end.

[0021] Specifically, in this embodiment, the rod-type displacement meter 11 includes a retractable rod 111 disposed in a housing and a reset spring 112 connected to the rod 111. The outer end of the rod is a retractable end that can be connected to the bridge deck 50, and the end is provided with a mounting hole, which can facilitate the displacement meter to be fixed on a test platform or a bracket of a measured object. The reset spring 112 can automatically reset after use.

[0022] The rod displacement meter 11 has a built-in LVDT (Linear Variable Differential Transformer) linear displacement sensor that can convert mechanical displacement into electrical signals. The angle measurement ring 12 has a built-in angle sensor that can convert mechanical rotation into electrical signals. The rod angle displacement meter 10 also includes a digital module and a power supply module 113. The LVDT linear displacement sensor and the angle sensor are both connected to the digital module, and the digital module is connected to the edge computing gateway 20.

[0023] When the displacement meter is used, the tie rod 111 is first partially pulled out of the housing, and the outer end of the tie rod 111 is fixed to the bridge deck 50, and then the fixed end of the displacement meter is fixed to the relatively stable surface of the pier 60. When the bridge deck 50 is displaced relative to the pier 60, the tie rod 111 will be extended and retracted, causing the length of the tie rod to change, and the angle measurement ring 12 will be driven to rotate. At this time, the angle between the tie rod 111 and the vertical direction changes. The LVDT linear displacement sensor converts the mechanical displacement into an electrical signal, and the angle sensor can convert the mechanical rotation into an electrical signal, and transmit the length change and angle change data to the rear digital module.

[0024] The edge computing gateway 20 is used to transmit the pull rod displacement change and pull rod angle change data monitored by the pull rod angle displacement meter 10 to the remote processing terminal 30 .

[0025] Specifically, in this embodiment, the edge computing gateway 20 transmits data with the remote processing terminal 30 through ZigBee and 4G / 5G networks. The edge computing gateway 20 is specifically composed of a processor, a memory, a communication interface, and a power management module. The processor can efficiently run edge computing tasks and handle the conversion calculation and data processing flow of the length and angle of the pull-rod displacement meter 11. The memory is used to store data and programs when the device is running. The communication interface includes ZigBee and 4G / 5G interfaces, which enable the gateway to communicate remotely with the remote processing terminal 30 in a mobile network environment and achieve high-speed data transmission with the cloud.

[0026] The remote processing terminal 30 is used to perform trigonometric calculation on the acquired pull rod displacement change and pull rod angle change data to obtain the relative displacement data between the bridge deck 50 and the bridge pier 60 .

[0027] Specifically, in this embodiment, the remote processing terminal 30 is used to calculate the length change data and the angle change data of the pull rod displacement meter in the edge computing gateway 20 through trigonometric functions, obtain the relative displacement data between the bridge deck 50 and the bridge pier 60, and present the analysis results on the visualization platform.

[0028] In this embodiment, the remote processing terminal 30 is specifically used to perform statistical analysis on the horizontal displacement of the bridge deck 50 relative to the bridge pier 60 in different monitoring periods, and to use a visualization platform to visualize the analysis data, thereby intuitively showing the changing trend of the horizontal displacement of the bridge deck 50 relative to the bridge pier 60.

[0029] In this embodiment, the system also includes a solar panel 40 , which is a photovoltaic panel group fixed to the pier 60 or under the bridge deck, and is used to power the edge computing gateway 20 .

[0030] The bridge displacement monitoring system based on the tie rod angle displacement meter 10 proposed in this embodiment is suitable for monitoring the relative displacement of the bridge deck, such as Figure 4 As shown, the operation process specifically includes the following steps: (1) On-site deployment of bridge displacement monitoring system equipment 1. Pull out a portion of the pull rod 111 of the pull rod displacement meter 11, and fix the end of the pull rod 111 on the surface of the monitored object. In this embodiment, the monitored object is the bridge deck 50 of the bridge. For specific installation positions, see Figure 2 ; 2. Fix the other end of the pull-rod displacement meter 11 on the relatively stable surface of the bridge pier 60; 3. Connect the pull-rod displacement meter 11 to the edge computing gateway 20; 4. Connect the solar panel 40 to the edge computing gateway 20; 5. Debug the equipment and network, and connect the tie rod angle displacement meter 10 and the remote processing terminal 30 via the network.

[0031] (2) Bridge deck relative displacement monitoring 1. Initial value calibration of the equipment. After the system is deployed, the initial calibration angle between the pull rod and the vertical direction is obtained. The initial length of the tie rod is , and then start monitoring; 2. The rod displacement meter 11 collects the relative displacement of the bridge deck 50 and the bridge pier 60 during the monitoring period. The collected data are divided into two types: one is the length change value of the rod , and the second is the angle change between the pull rod and the vertical direction ; 3. The collected data is stored in the edge computing gateway 20 and sent to the remote processing terminal 30 within a fixed monitoring period.

[0032] (3) Remote processing terminal 30 processing 1. After receiving the data within the monitoring period, the remote processing terminal 30 performs data processing and analysis calculations in the background, and finally outputs the horizontal displacement data of the bridge deck 50 relative to the bridge pier 60. Figure 5 As shown, the calculation process is as follows: In this application, it is assumed that after the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge for: .

[0033] 2. After the current monitoring cycle is completed, repeat the above steps in the next monitoring cycle. The horizontal displacement of the bridge in different monitoring cycles is statistically analyzed in the remote processing terminal 30, and the visualization platform is used to visualize the analysis data to intuitively show the changing trend of the horizontal displacement of the bridge. After completing the monitoring task, a monitoring report is output.

[0034] Based on the above disclosed bridge displacement monitoring system based on tie rod angle displacement meter, the embodiment of the present application further discloses a bridge displacement monitoring method based on tie rod angle displacement meter, which specifically includes the following steps: S100, deploying a tie rod angle displacement meter 10 and an edge computing gateway 20 at the bridge site, wherein the tie rod angle displacement meter 10 includes a tie rod type displacement meter 11 for monitoring the change of tie rod displacement and an angle measurement ring 12 for monitoring the change of tie rod angle, wherein one end of the tie rod type displacement meter 11 is a retractable end and the other end is a fixed end, wherein the retractable end is connected to the bridge deck 50 and the fixed end is connected to the bridge pier 60, and the angle measurement ring 12 is arranged at the fixed end; S200, debugging equipment and network, calibrating the initial value of the tie rod angle displacement meter 10 and starting monitoring, and transmitting the tie rod displacement change and tie rod angle change data monitored by the tie rod angle displacement meter to the remote processing terminal 30 through the edge computing gateway 20; S300, the remote processing terminal 30 performs trigonometric calculation on the obtained pull rod displacement change and pull rod angle change data to obtain relative displacement data between the bridge deck 50 and the bridge pier 60.

[0035] Furthermore, the obtained pull rod displacement change and pull rod angle change data are processed by trigonometric calculation to obtain the relative displacement data between the bridge deck and the bridge pier, specifically including: Assuming that the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge deck relative to the pier is for: .

[0036] It should be noted that the detailed step description of the bridge displacement monitoring method based on the tie rod angle displacement meter provided in the embodiment of the present application can refer to the relevant description of the bridge displacement monitoring system based on the tie rod angle displacement meter provided in the embodiment of the present application, which will not be repeated here.

[0037] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A bridge displacement monitoring system based on a tie rod angle displacement meter, characterized in that: The system includes a tie rod angle displacement meter and an edge computing gateway deployed at the bridge site and a remote processing terminal connected to the edge computing gateway via a network; The tie rod angle displacement meter comprises a tie rod displacement meter for monitoring the change of tie rod displacement and an angle measuring ring for monitoring the change of tie rod angle, one end of the tie rod displacement meter is a retractable end and the other end is a fixed end, the retractable end is connected to the bridge deck, the fixed end is connected to the bridge pier, and the angle measuring ring is arranged at the fixed end; The edge computing gateway is used to transmit the pull rod displacement change and pull rod angle change data monitored by the pull rod angle displacement meter to the remote processing terminal; The remote processing terminal is used to perform trigonometric calculation on the acquired pull rod displacement change and pull rod angle change data to obtain relative displacement data between the bridge deck and the bridge pier.

2. A bridge displacement monitoring system based on a tie rod angle displacement meter as claimed in claim 1, characterized in that: The pull-rod displacement meter comprises a retractable pull-rod arranged in a housing and a reset spring connected to the pull-rod. The pull-rod displacement meter is equipped with an LVDT linear displacement sensor.

3. A bridge displacement monitoring system based on a tie rod angle displacement meter as claimed in claim 2, characterized in that: The angle measuring ring is equipped with an angle sensor.

4. A bridge displacement monitoring system based on a tie rod angle displacement meter as claimed in claim 3, characterized in that: The pull rod angle displacement meter also includes a digital module and a power supply module. The LVDT linear displacement sensor and the angle sensor are both connected to the digital module, and the digital module is connected to the edge computing gateway.

5. The bridge displacement monitoring system based on the tie rod angle displacement meter according to claim 1, characterized in that: The obtained rod displacement change and rod angle change data are processed by trigonometric calculation to obtain the relative displacement data between the bridge deck and the bridge pier, including: Assuming that the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge deck relative to the pier is for: 。 6. The bridge displacement monitoring system based on the tie rod angle displacement meter according to claim 1, characterized in that: The system also includes a solar panel, which is fixed under the bridge pier or the bridge deck and is used to power the edge computing gateway.

7. The bridge displacement monitoring system based on the tie rod angle displacement meter according to claim 1, characterized in that: The edge computing gateway transmits data with the remote processing terminal via ZigBee and 4G / 5G networks.

8. The bridge displacement monitoring system based on the tie rod angle displacement meter according to claim 1, characterized in that: The remote processing terminal is also specifically used to perform statistical analysis on the horizontal displacement values ​​of the bridge deck relative to the bridge piers in different monitoring periods, and to use a visualization platform to visualize the analysis data, so as to intuitively display the changing trend of the horizontal displacement values ​​of the bridge deck relative to the bridge piers.

9. A bridge displacement monitoring method based on a tie rod angle displacement meter, characterized in that: The method comprises: Deploy a tie rod angle displacement meter and an edge computing gateway at the bridge site, wherein the tie rod angle displacement meter includes a tie rod type displacement meter for monitoring the change of tie rod displacement and an angle measurement ring for monitoring the change of tie rod angle, wherein one end of the tie rod type displacement meter is a retractable end and the other end is a fixed end, wherein the retractable end is connected to the bridge deck, and the fixed end is connected to the bridge pier, and the angle measurement ring is arranged at the fixed end; Debug the equipment and network, calibrate the initial value of the tie rod angle displacement meter and start monitoring, and transmit the tie rod displacement change and tie rod angle change data monitored by the tie rod angle displacement meter to the remote processing terminal through the edge computing gateway; The obtained tie rod displacement change and tie rod angle change data are processed by trigonometric calculation through the remote processing terminal to obtain the relative displacement data between the bridge deck and the bridge pier.

10. The bridge displacement monitoring method based on the tie rod angle displacement meter according to claim 9 is characterized in that: The obtained rod displacement change and rod angle change data are processed by trigonometric calculation to obtain the relative displacement data between the bridge deck and the bridge pier, including: Assuming that the system is deployed, the initial calibration angle between the pull rod and the vertical direction is The initial length of the tie rod is The length change of the pull rod during the monitoring period is , the angle change value is , then the horizontal displacement of the bridge deck relative to the pier is for: 。

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