Pre-alarm method for bridge damage

Abstract

The embodiment of the invention discloses a pre-alarm method for bridge damage, and relates to the technical field of intelligent traffic. According to the invention, for a scene in which field mobile network coverage is unstable or a base station is easy to damage in a disaster, in order to ensure that the alarm linkage device can start working at the first time after an alarm is triggered under the condition of no power and no network, alarm devices such as a flash warning device and the like are started preferentially through the LoRa network. The wireless gateway can directly issue an instruction by adopting a LoRa communication mode to trigger the alarm devices such as the flash warning device to perform linkage, so that timely and effective monitoring and early warning can be realized even under the condition that no network exists due to extreme disasters. The scheme is characterized in that alarm linkage does not depend on a base station network, and long-term stable timely pre-alarm can be carried out on a bridge with a damage accident in a harsh environment without electricity and a network.

Description

Technical Field

[0001] The invention relates to the field of intelligent transportation technology, and in particular to a pre-alarm method for bridge damage. Background Art

[0002] As an important part of transportation infrastructure, the safety and stability of bridges are crucial to people's travel and economic development. my country naturally has the geographical characteristics of dense river networks and developed water systems, and many bridges have been built on rivers. However, bridge collapse accidents have occurred frequently in recent years, posing a serious threat to people's lives and property. In particular, large-scale agricultural bridges built on rural roads and highway bridges on township roads in recent decades will have a large number of safety hazards after long-term use. The main reason is that these bridges often fail to fully consider the bearing capacity, durability and disaster resistance of bridges when designing, especially the development speed of domestic civilian vehicles is not expected. The weak links of the bridge structure have been crushed by overloaded vehicles for a long time, exceeding the bearing capacity of the bridge. There are also problems such as cutting corners and illegal operations during construction, or lax construction quality control, which reduces the quality of the bridge. In long-term use, natural disasters such as earthquakes, floods, and typhoons can also cause serious damage to bridges. In addition, many bridges have long lacked maintenance and care, resulting in structural aging and reduced strength.

[0003] In addition, due to the long-term shortage of grassroots police force in my country, and with the acceleration of urbanization and industrialization, grassroots personnel such as militia, joint prevention and control, and village committees in rural and township areas are gradually insufficient. However, with the acceleration of rural and township infrastructure construction in my country, more and more new bridges are being built. This leads to situations where when a bridge is damaged or seriously aged and becomes unsuitable for passing (for example, cracks in the building structure caused by a ship collision), the bridge site will not receive timely alarms and traffic control, and vehicles and pedestrians will continue to pass the bridge without knowing it, thus leading to secondary accidents.

[0004] At present, there are also some solutions that use the existing power supply system and mobile communication network for early warning, but such solutions are difficult to cope with more severe usage scenarios. In natural disasters, major accidents, severe weather, etc., when bridges are damaged, the power supply system and mobile communication network are often paralyzed / interrupted. Therefore, these existing solutions are difficult to achieve long-term stable operation in harsh environments without electricity and network.

[0005] Some drones are used for safety monitoring and partial rescue missions, which is a feasible response method, but there are also many defects. For example, when drones are used to cruise to monitor the safety of bridges, only rough visual observation can be performed. However, many times, bridge damage often occurs inside the supporting structure or in places that are blocked (such as the lowering of the bridge deck). It is difficult to clearly distinguish whether the bridge has hidden dangers with only rough visual observation, and pedestrians or vehicles that continue to pass by become the "last straw that breaks the camel's back". For some areas with dense water networks and concentrated bridges, if drones perform rescue missions in low visibility or at night, it is difficult to directly find the bridge where the accident occurred in the first time without the guidance of ground personnel.

[0006] Therefore, how to achieve long-term and stable early warning of bridges that have been damaged in harsh environments has become a direction that needs further optimization. Summary of the invention

[0007] The embodiment of the present invention provides a method for early warning of bridge damage, which can achieve long-term and stable early warning of bridges that have been damaged in harsh environments.

[0008] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0009] A pre-alarm method for bridge damage, the method is applied in a pre-alarm system, the pre-alarm system comprises: a multi-sensing device, a wireless gateway, an alarm linkage device and a solar power supply system, the wireless gateway establishes a LoRa wireless ad hoc network with the multi-sensing device and the alarm linkage device, and the transmission line of the solar power supply system connects the multi-sensing device, the wireless gateway and the alarm linkage device;

[0010] The pre-alarm method comprises:

[0011] S1. When the multi-sensing device determines that a sudden change in the structural state occurs based on the collected sensing data, the sensing data is sent to the wireless gateway;

[0012] S2, the wireless gateway performs edge computing processing according to the sensing data, and then sends a trigger signal to the alarm linkage device;

[0013] S3. The alarm linkage device that receives the trigger signal activates the alarm linkage equipment corresponding to the trigger signal, so that after the alarm linkage equipment is activated, secondary damage caused by ships, vehicles and other transportation vehicles can be detected and evaluated in time.

[0014] The pre-alarm method for bridge damage provided by the embodiment of the present invention is to ensure that the alarm linkage device can start working as soon as possible after the alarm is triggered when there is no electricity or network in the scene where the mobile network coverage is unstable or the base station is easily damaged during a disaster. In order to ensure that the alarm linkage device can start working immediately after the alarm is triggered when there is no electricity or network, the alarm device such as the flash warning device is activated through the LoRa network first. The wireless gateway can use the LoRa communication method to directly send instructions to trigger the alarm device such as the flash warning device for linkage, ensuring that even in the case of no network due to extreme disasters, timely and effective monitoring and early warning can be achieved. The feature of this solution is that the alarm linkage does not rely on the base station network, and can achieve long-term and stable timely pre-alarm of bridges that have been damaged in harsh environments without electricity and network. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 , 3 A schematic diagram of the overall architecture provided for an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a method flow chart provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of a practical application scenario provided by an embodiment of the present invention;

[0019] Figure 4 , 5 , 6, and 7 are schematic diagrams of specific devices provided in embodiments of the present invention;

[0020] Figure 8 A schematic diagram of the internal architecture of a multi-sensing device provided by an embodiment of the present invention;

[0021] Fig. 9 A schematic diagram of the appearance of a multi-sensing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. It can be understood by those skilled in the art that, unless specifically stated, the singular forms "one", "one", "said" and "the" used herein may also include plural forms. It should be further understood that the term "including" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as generally understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0023] The embodiment of the present invention provides a method for early warning of bridge damage, the method is applied in a Figure 1 In the pre-alarm system shown, the pre-alarm system includes: a multi-sensing device, a wireless gateway, an alarm linkage device and a solar power supply system, the wireless gateway establishes a LoRa wireless ad hoc network with the multi-sensing device and the alarm linkage device, and the transmission line of the solar power supply system connects the multi-sensing device, the wireless gateway and the alarm linkage device;

[0024] The solar power supply system in this embodiment includes photovoltaic panels, energy storage batteries, transformers and other equipment, that is, the solar power supply system has the functions of photovoltaic power generation, energy storage and power supply for other equipment. At present, this type of solar power supply system is already a very mature product, and there are many solar power supply solutions with the above functions on the market, which will not be described in detail in this embodiment.

[0025] like Figure 2 As shown, the pre-alarm method includes:

[0026] S1. When the multi-sensing device determines that a sudden change in the structural state occurs based on the collected sensing data, the sensing data is sent to the wireless gateway; wherein the wireless gateway can adopt various short-distance communication modes such as LORA, ZIgbee, WiFi, Bluetooth, NFC, RFID, etc., and LORA is preferably used in consideration of balancing performance and cost.

[0027] S2, the wireless gateway performs edge computing processing according to the sensing data, and then sends a trigger signal to the alarm linkage device;

[0028] S3. The alarm linkage device that receives the trigger signal starts the alarm linkage equipment corresponding to the trigger signal.

[0029] Specifically, Figure 3 , 4 As shown, the types of the alarm linkage device include: Figure 4 The flashing warning device shown, such as Figure 5 The snapshot camera shown and Figure 6 In the variable information board shown, sending a trigger signal to the alarm linkage device at least includes: a signal that triggers the start of the flash warning device.

[0030] In actual applications, for scenarios where the mobile network coverage is unstable or the base station is easily damaged during a disaster, in order to ensure that the alarm linkage device can start working immediately after the alarm is triggered when there is no electricity or network, the alarm devices such as the flash warning device are activated through the LoRa network first. The wireless gateway can use the LoRa communication method to directly send instructions to trigger the flash warning device and other alarm devices for linkage, ensuring that timely and effective monitoring and early warning can be achieved even when there is no network due to extreme disasters. The feature of this solution is that the alarm linkage does not rely on the base station network, and can achieve long-term and stable early warning of bridges that have been damaged in harsh environments without electricity and network.

[0031] In this embodiment, flash warning devices are installed on both sides of the road away from the entrance and exit of the bridge; the installation density of the flash warning devices is positively correlated with the distance from the entrance and exit of the bridge. In the preferred embodiment, flash warning devices are installed at 100 meters, 200 meters, 500 meters and 1000 meters on both sides of the road away from the entrance and exit of the bridge; within 1000 meters from the entrance and exit of the bridge, if there is a fork in the road, a flash warning device is installed at the fork in the road. Optionally, a 50-meter interval method can be adopted, or it can be adjusted according to customer requirements and road traffic speed.

[0032] Further, such as Figure 3As shown, the wireless gateway also integrates a 4G / 5G communication module, and the wireless gateway establishes a connection with the monitoring and early warning platform through the 4G / 5G mobile communication network; the snapshot camera and the variable information board also establish a connection with the monitoring and early warning platform through the mobile communication network.

[0033] Therefore, after S1, the wireless gateway will send the sensing data to the monitoring and early warning platform through the 4G / 5G mobile communication network; the multi-sensing device is connected to the wireless gateway through a self-organizing network. Once the alarm is triggered, the wireless gateway quickly aggregates the data of each multi-sensing device (that is, the multi-sensing device is used as a sensing node) and transmits it to the monitoring and early warning platform through the 4G / 5G communication module. Among them, the variable information board is used to receive and display the pre-alarm information preset in the wireless gateway, or receive and display the pre-alarm information sent by the monitoring and early warning platform.

[0034] The snapshot cameras include: a first group of snapshot cameras deployed at the entrance and exit of the bridge and used to capture the road within a specified distance from the entrance and exit of the bridge; and / or a second group of snapshot cameras deployed on both sides of the river at a preset distance from the bridge and used to capture the ships passing through the bridge. The snapshot cameras can use an independent solar power supply device, and at the same time, the snapshot cameras maintain connection with the solar power supply system and the power line. The snapshot cameras can be powered by any of the solar power supply system, the independent solar power supply device or the power line.

[0035] From the perspective of daily use, the pre-alarm system in this embodiment can also be powered by the power line of the power supply system, so as to work in a secondary harsh environment with electricity but no grid, and reduce the loss of the solar power supply system, and can install high-power consumption equipment such as radar equipment without limiting the use. Specifically, the multi-sensing device, wireless gateway and alarm linkage device can also be connected to the power line of the power supply system of the grid at the same time; after the power line is disconnected, the solar power supply system is started to supply power to the multi-sensing device, wireless gateway and alarm linkage device.

[0036] In addition to having a significant impact on traffic, bridge collapse accidents also cause serious safety accidents for vehicles and pedestrians on the road section due to the failure to discover the accident in time. The design purpose of this embodiment is to solve the problem of reducing secondary casualties caused by bridge collapse. A solution has been developed that can achieve long-term and stable early warning of bridges that have been damaged in harsh environments without electricity and the Internet, so as to form effective traffic control in the first place. In addition, in this embodiment, the strong light or sound generated by the flashing warning device can also facilitate rescue guidance.

[0037] Optionally, a scheme for detecting and evaluating secondary damage caused by ship vehicles is also designed in this embodiment, so as to further improve the effect of achieving long-term and stable pre-alarm of bridges that have been damaged in harsh environments. Specifically, the alarm linkage device also includes radar equipment; wherein the snapshot camera is used to monitor the passing ships in advance to collect information such as the tonnage, speed, and trajectory of the ships. When the ship arrives in front of the bridge, the camera identifies the ship number and the angle and position of the ship's collision with the bridge; the radar equipment is used to measure the tonnage and speed of the ship, while analyzing the ship's travel trajectory, measuring the current water flow speed, and passing through the ship's running trajectory after the ship hits the bridge.

[0038] After S3 also includes:

[0039] The tonnage, speed and navigation track data of the ship on the river channel and approaching the bridge are collected by the snapshot camera, and the ship speed, navigation track data and water flow speed are collected by the radar device, and the ship speed and navigation track data collected by the snapshot camera are weightedly fused with the ship speed and navigation track data collected by the radar device;

[0040] Detect whether a collision has occurred. If a collision has occurred, use the collected ship data to obtain the impact force of the ship collision;

[0041] Among them, once a collision and scrape occur, the sensor data will change significantly. The waveform of the sensor data change caused by the vehicle passing through the bridge is different from the waveform of the sensor data change caused by the ship collision and scrape, so the ship collision can be identified by the waveform. In view of the problems that the vehicle-ship collision sensing data and video capture cannot be linked and the traditional vehicle-ship collision monitoring and alarm equipment has a high false alarm rate, this embodiment uses an independent video monitoring system and a radar system to monitor the passing ships in advance, collect the trajectory tracking of the ship, measure the water flow speed and other information, and collect vibration data to collect the amplitude and frequency generated at the moment the bridge receives the impact. Combined with the video capture linkage and filtering the vibration data at the same time, it can accurately determine whether a collision has occurred. Among them, by combining the sensing device measurement data with the design information of the bridge and then through the theoretical analysis of the finite element analysis model and the LS-DYNA simulation model, it is possible to accurately determine the damage caused to the bridge by the ship hitting the bridge.

[0042] According to the impact force of the ship collision and the bearing capacity of the bridge, the damage condition of the bridge is analyzed, and the damage condition is sent to the monitoring and early warning platform.

[0043] The process of detecting whether a collision occurs includes: when the ship reaches a specified distance in front of the bridge, obtaining the angle information and position information of the ship hitting the bridge through the capture camera; and collecting event information when the collision occurs through the multi-sensing device, and the event information includes: angular velocity information of the ship collision, amplitude and frequency information of the bridge after the impact.

[0044] Specifically, the damage of the bridge is analyzed according to the impact force of the ship collision and the bearing capacity of the bridge, including: obtaining the impact force P of the ship collision S =0.12×V×(DWT) 0.5 , where P S is the impact force of the ship collision, DWT is the deadweight tonnage of the ship, and V is the impact speed of the ship;

[0045] The ship impact velocity V is determined using the ship data, where: X c <X≤XL,V u Indicates that the ship speed in the ship data is equal to the normal speed of the ship in the channel, V L represents the average value of the water velocity as the minimum design impact velocity of the ship, X represents the distance from the centerline of the pier to the centerline of the channel determined by the navigation trajectory data, and X c Indicates the distance from the centerline of the channel to the edge of the channel, X L It represents the distance from the center line of the channel to n times the ship length, where n is a positive integer;

[0046] Build a bridge capacity model: Among them, Vyd represents the design value of the bearing capacity of the component, Vcd represents the design value of the bearing capacity of the concrete part, Vwd represents the design value of the shear bearing capacity of the stirrup part, Vsd represents the design value of the shear bearing capacity of the steel frame part, Фs represents the shear impact effect reduction factor, Vc represents the shear strength of concrete, and Ag represents the gross cross-sectional area of ​​the component cross section. fc' represents the standard value of the compressive strength of a concrete cylinder at 28 days, and fc' = 0.8 / fcuk + 8MPa, fcuk is the standard value of the compressive strength of a concrete cube, c1 and c2 are the reinforcement calculation coefficient and axial force calculation coefficient respectively;

[0047] When the damage of the bridge reaches the first damage level, the flash warning device is activated, wherein the damage of the bridge includes: if P s ≤5%*Vyd, the damage level of the bridge is level 1; if 5%*Vyd≤P s ≤30%*Vyd, the damage level of the bridge is level 2; if P s >30%*Vyd, the damage level of the bridge is level three.

[0048] Specifically, if the damage level of the bridge is determined to be level one, the flash warning device is activated, and a "request for maintenance" message can be sent to the variable information board through the gateway and displayed, so as to prompt regular patrol personnel to check and repair the bridge in time; if the damage level of the bridge is determined to be level two, an immediate on-site inspection notification is sent to the monitoring and early warning platform through the gateway; if the damage level of the bridge is determined to be level three, a road blocking notification is sent to the monitoring and early warning platform through the edge gateway. For example: according to the bearing capacity of the bridge receiving an impact force of less than 5%, it is determined to be level one damage, and regular inspections are required. Therefore, the flash warning device is activated and a "request for maintenance" message is sent to the variable information board, so that the patrol drone can quickly identify the problematic bridge through the activated flash warning device, and the activated flash warning device and variable information board can also quickly prompt the ground patrol personnel, thereby improving the response speed of maintenance and rescue.

[0049] In this embodiment, a bridge simple sensing device integrates "vibration-tilt-temperature" multi-parameter sensing, and is highly integrated with "collection-power supply-transmission" functions. It can achieve long-term stable operation in harsh environments without electricity and network, and can achieve automatic continuous measurement, accurate alarm triggering, and instant linkage release. Specifically, the multi-sensing device includes a multi-axis acceleration sensor, a tilt sensor, a displacement sensor, and a temperature sensor; Figure 8 As shown, a multi-axis acceleration sensor, an inclination sensor and a temperature sensor are connected to an MCU microcontroller, a Hall sensor is integrated on the MCU microcontroller, the MCU microcontroller is connected to a short-distance communication module, and the protocol types adopted by the short-distance communication module include LORA, ZIgbee, WiFi, Bluetooth, NFC and / or RFID; a battery for power supply is installed in the multi-sensing device.

[0050] Among them, the MCU microcontroller of the multi-sensing device is responsible for basic angle calculation, vibration data calculation, threshold judgment and over-threshold alarm functions, for example: the wireless gateway performs edge computing processing according to the sensing data, including: the wireless gateway calculates the inclination angle of the bridge structure where the multi-sensing device is located in real time according to the sensing data of the inclination sensor in the multi-sensing device, and compares it with the inclination angle threshold, and sends a trigger signal to the alarm linkage device when the inclination angle threshold is exceeded; and, the wireless gateway calculates the vibration amplitude of the bridge structure where the multi-sensing device is located in real time according to the sensing data of the multi-axis acceleration sensor in the multi-sensing device, and compares it with the vibration amplitude threshold, and sends a trigger signal to the alarm linkage device when the vibration amplitude threshold is exceeded.

[0051] The wireless gateway is an intelligent gateway device that uses LoRa wireless modulation technology to achieve long-distance data transmission. It aggregates sensor node data through wireless LoRa technology and performs edge computing processing. Optionally, the processed data is transmitted to the monitoring and early warning platform via a 4G wireless network. In addition, the gateway also has the ability to directly trigger the alarm device for linkage, and can achieve timely and effective alarm linkage even when the mobile network is not accessible. The device is powered by solar energy, which effectively solves the problem of no mains power supply on site. At the same time, it has GPS high-precision clock synchronization function, as well as multi-frequency and multi-channel concurrent processing capabilities, which can meet the complex large-capacity networking needs on site.

[0052] The alarm linkage devices are equipped with wireless receivers that can receive instructions from wireless gateways and / or monitoring and early warning platforms, thereby achieving rapid deployment and timely linkage. Commonly used bridge disaster monitoring site alarm linkage devices mainly include snapshot cameras, variable information boards and flash warning devices.

[0053] Optionally, a monitoring and early warning platform for bridge disasters can be built based on the Internet of Things technology. The monitoring and early warning platform can monitor the online status of each device in real time and provide timely early warnings for potential safety hazards. Once a bridge collapses, the platform will immediately issue an alarm and clearly display the real-time alarm data. Figure 7 As shown, the existing communication and digital technologies can be used to realize multi-cloud deployment of the monitoring and early warning platform, and allow terminal devices to access the underlying protocols, thus achieving efficient collaboration and minimalist access to the "cloud-end-edge" architecture.

[0054] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for early warning of bridge damage, characterized in that: The method is applied in a pre-alarm system, which includes: a multi-sensing device, a wireless gateway, an alarm linkage device and a solar power supply system, wherein the wireless gateway establishes a LoRa wireless ad hoc network with the multi-sensing device and the alarm linkage device, and the transmission line of the solar power supply system connects the multi-sensing device, the wireless gateway and the alarm linkage device; The pre-alarm method comprises: S1. When the multi-sensing device sends the sensing data to the wireless gateway through short-distance communication based on the collected sensing data S2, the wireless gateway performs edge computing processing according to the sensing data, and then sends a trigger signal to the alarm linkage device; S3. The alarm linkage device that receives the trigger signal starts the alarm linkage equipment corresponding to the trigger signal.

2. The method according to claim 1, characterized in that The types of the alarm linkage device include a flash warning device, a snapshot camera and a variable information board, and the sending of a trigger signal to the alarm linkage device at least includes: a signal that triggers the flash warning device to start; Strobe warning devices are installed on both sides of the road near the entrance and exit of the bridge; The installation density of the flash warning device is positively correlated with the distance from the entrance and exit of the bridge.

3. The method according to claim 1, characterized in that Flashing warning devices are installed at 100m, 200m, 500m and 1000m on both sides of the road from the entrance and exit of the bridge; If there is a fork in the road within 1,000 meters of the entrance and exit of the bridge, a flashing warning device will be installed at the fork in the road.

4. The method according to claim 2, characterized in that: The wireless gateway also integrates a 4G / 5G communication module, and the wireless gateway establishes a connection with the monitoring and early warning platform through the 4G / 5G mobile communication network; The snapshot camera and the variable information board are also connected to the monitoring and early warning platform through the mobile communication network.

5. The method according to claim 4, characterized in that Also includes: After S1, the wireless gateway will send the sensing data to the monitoring and early warning platform through the 4G / 5G mobile communication network; The variable information board is used to receive and display the pre-alarm information preset in the wireless gateway, or receive and display the pre-alarm information sent by the monitoring and early warning platform; The snapshot cameras include: a first group of snapshot cameras deployed at the entrance and exit of the bridge and used to capture roads within a specified distance from the entrance and exit of the bridge; and / or a second group of snapshot cameras deployed on both sides of the river at a preset distance from the bridge and used to capture ships passing through the bridge.

6. The method according to claim 2, characterized in that The multi-sensing device, wireless gateway and alarm linkage device can also be connected to the power line of the power grid power supply system at the same time; After the power line is disconnected, the solar power supply system is started to supply power to the multi-sensing device, the wireless gateway and the alarm linkage device.

7. The method according to claim 1, characterized in that The multi-sensing device includes a multi-axis acceleration sensor, an inclination sensor, a displacement sensor and a temperature sensor; Among them, the multi-axis acceleration sensor, inclination sensor and temperature sensor are connected to the MCU microcontroller, the MCU microcontroller is integrated with a Hall sensor, the MCU microcontroller is connected to the short-distance communication module, and the protocol types adopted by the short-distance communication module include LORA, ZIgbee, WiFi, Bluetooth, NFC and / or RFID; a battery for power supply is installed in the multi-sensing device.

8. The method according to claim 1, characterized in that The wireless gateway performs edge computing processing according to the sensing data, including: The wireless gateway calculates the inclination angle of the bridge structure where the multi-sensing device is located in real time according to the sensing data of the inclination sensor in the multi-sensing device, and compares it with the inclination angle threshold. When the inclination angle threshold is exceeded, a trigger signal is sent to the alarm linkage device; And, the wireless gateway calculates the vibration amplitude of the bridge structure where the multi-sensing device is located in real time based on the sensing data of the multi-axis acceleration sensor in the multi-sensing device, and compares it with the vibration amplitude threshold. When the vibration amplitude threshold is exceeded, a trigger signal is sent to the alarm linkage device.

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