Mechanical trigger alarm device for sudden collapse of road main body and use method

Abstract

The invention discloses a mechanical trigger alarm device for sudden collapse of a road main body and a use method. The alarm device comprises a box body, a ground switch module, a power supply management module and a communication alarm module, the multiple box bodies are arranged on the two sides of a road at set intervals in the length direction of the road and serve as installation carriers and protection shells of all the modules. The ground switch module comprises a ground switch body, a conductive ball and a conductive sheet, wherein the conductive ball and the conductive sheet are arranged in the ground switch body. The conducting strips are electrically connected with the power management module and are symmetrically arranged in pairs; the power management module is electrically connected with the communication alarm module; the conductive balls are in an initial static position when the road main body is not collapsed, and are separated from the paired conductive sheets; when the road main body collapses, the conductive ball is separated from the initial static position due to vibration or inclination and is in contact with at least one pair of symmetrically arranged conductive sheets, and the power supply management module receives a conduction signal and supplies power to the communication alarm module, so that the communication alarm module continuously sends alarm information.

Description

Technical Field

[0001] This invention belongs to the field of intelligent road monitoring technology, and more specifically, relates to a mechanically triggered alarm device and its usage method for sudden collapse of the main road structure. Background Technology

[0002] In recent years, with the rapid development of my country's transportation infrastructure, highways and other roads have become major transportation routes. However, with the continuous expansion of the transportation network, sudden collapses of road structures (such as bridges, tunnels, and culverts) and slopes due to geological changes, natural erosion, and natural disasters occur frequently, seriously threatening road safety and even causing major traffic accidents. These accidents are characterized by their suddenness, difficulty in early warning, and high requirements for emergency response, urgently necessitating a high-efficiency, stable, low-cost monitoring and early warning system with real-time warning capabilities.

[0003] To address these challenges, a series of studies and practices have been conducted both domestically and internationally in the field of road structure and slope monitoring. Foreign countries started earlier in this field and generally employ advanced technologies such as fiber optic sensing, satellite remote sensing, and the Internet of Things (IoT) to build relatively complete automated monitoring systems. For example, distributed fiber optic sensing technology is used to monitor the deformation and stress changes of road structures in real time; satellite remote sensing technology is used to acquire large-scale geological deformation data to assist in identifying potential risk areas; and IoT technology is combined to achieve remote data acquisition and transmission, improving monitoring efficiency. In addition, some systems have introduced artificial intelligence algorithms for data analysis and risk prediction to improve the accuracy of early warnings. Domestically, based on actively learning from international experience and combined with its own geographical environment and traffic characteristics, relevant technological research has been carried out. For example, road structure health monitoring systems are being built based on traditional sensors (such as accelerometers, tilt sensors, and displacement sensors); wireless sensor networks are being used to achieve multi-node data acquisition and centralized processing; and some regions are attempting to introduce machine learning algorithms to optimize early warning models and improve the system's intelligence level.

[0004] Although existing technologies have improved the monitoring capabilities of road structures and slopes to some extent, many problems still exist in practical applications, making it difficult to meet the needs of large-scale promotion and practical application. For example, existing monitoring systems generally use complex algorithm models, resulting in slow system response speed, high computational resource consumption, and susceptibility to interference from environmental noise, temperature changes, and other factors, leading to unstable sensitivity and a tendency for misjudgments or missed judgments. Secondly, most systems still cannot activate the alarm mechanism in time when the road structure is about to collapse, resulting in poor system stability, high failure rate, and the risk of "failing at critical moments," which seriously weakens the early warning effect. In addition, current early warning systems lack specificity and accuracy, failing to achieve a definitive collapse judgment mechanism. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a mechanical trigger alarm device and its usage method for sudden collapse of the main road structure. With modularity, low coupling and mechanical triggering as the core, it has a simple structure, low cost and is easy to deploy and maintain. Moreover, it does not rely on external networks or complex data processing systems. It can effectively make up for the shortcomings of the existing technology in road structure collapse early warning. It is particularly suitable for road safety monitoring in remote mountainous areas and areas prone to geological disasters.

[0006] To achieve the above objectives, the present invention provides a mechanically triggered alarm device for sudden collapse of a road structure, comprising: a housing, a ground-locking switch module, a power management module, and a communication alarm module; wherein: Multiple boxes are spaced at intervals along the length of the road on both sides of the road, serving as the mounting carrier and protective shell for each module; The ground switch module includes: a ground switch body, conductive balls and conductive sheets disposed within the ground switch body; the conductive sheets are electrically connected to the power management module, and multiple conductive sheets are arranged in pairs symmetrically; The power management module is electrically connected to the communication alarm module; When the main road structure is intact, the conductive ball is in its initial static position and separates from the paired conductive plates. When the main road structure collapses, the conductive ball is affected by vibration or tilting and moves away from its initial static position, while simultaneously contacting at least one pair of symmetrically arranged conductive plates. The power management module receives the conduction signal and supplies power to the communication alarm module to ensure that the communication alarm module continues to work and send alarm information.

[0007] Furthermore, the ground switch body is a rectangular body with a spherical cavity inside and a bearing cavity for accommodating the conductive sheet on the inner wall of the spherical cavity. The conductive sheet is fixed in the bearing cavity and is electrically connected to the power management module through a wire passing through the ground switch body. The ground switch body is divided into a detachable upper body and a lower body by a horizontal section passing through the center of its spherical cavity; Furthermore, the seismic switch module also includes a support plate, which is horizontally disposed inside the lower part of the main body; The support plate has a conical through hole in the middle that is adapted to the conductive ball. The diameter of the conical through hole gradually decreases in the vertical downward direction and is three-quarters to one-third of the diameter of the conductive ball.

[0008] Furthermore, the power management module includes: a storage battery and a self-locking electronic switch; The battery is electrically connected to the self-locking electronic switch, the communication alarm module, and a conductive sheet located in one of the bearing cavities. The self-locking electronic switch is electrically connected to the communication alarm module and another conductive sheet located in the same bearing cavity; The self-locking electronic switch is a circuit that includes a bistable relay.

[0009] Furthermore, the communication alarm module includes: a communication submodule, a processor, a local alarm submodule, a communication bus, and a memory; The communication submodule supports bidirectional communication; The communication bus is used to enable communication between the various components within the communication alarm module.

[0010] Furthermore, the communication submodule is a mobile communication unit; The local alarm submodule includes a buzzer, model SFM-27, which has an intermittent sounding mode of 0.5s on and 0.5s off, with a sound pressure level of 120dB@1m.

[0011] Furthermore, the communication alarm module also includes a positioning submodule, which is a satellite positioning module.

[0012] Furthermore, the spacing between the boxes is 30m to 50m; The box is rectangular in shape, with a detachable panel at the front and a multi-layered internal structure. The enclosure also includes multiple mounting lugs and reflective strips on its outer surface.

[0013] Furthermore, the surface of the enclosure is provided with multiple antenna windows, and each antenna window is embedded with a window plate made of wave-transparent material. The edge of the window plate is sealed to the antenna window through a sealing structure.

[0014] Furthermore, the ground switch body is mainly made of transparent plastic material.

[0015] Another aspect of the present invention provides a method for using a mechanically triggered alarm device for sudden collapse of the main road structure, which is implemented using the alarm device described above, and includes the following steps: S1: Test the alarm device for normal operation by artificial vibration, and input the device code and preset position information into the memory of the communication alarm module; S2: Mark the installation points on both sides of the road to be installed, pre-install the box in the marked position, ensure that the internal conductive balls are in the initial static position, then firmly fix the box and enter the standby state; S3: When the main body of the road suddenly collapses, the conductive ball rolls and simultaneously contacts two conductive plates in a bearing cavity, triggering the self-locking electronic switch to enter the self-locking state, so that the battery supplies power to the communication alarm module and periodically and repeatedly sends alarm information containing device code, location and timestamp. At the same time, the local alarm submodule starts the alarm.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The alarm device of the present invention, with modularity, low coupling, and mechanical triggering as its core, has a simple structure, low cost, and is easy to deploy and maintain. Furthermore, it does not rely on external networks or complex data processing systems, and can effectively make up for the shortcomings of existing technologies in road structure collapse early warning. It is particularly suitable for road safety monitoring in remote mountainous areas and areas prone to geological disasters.

[0017] 2. The alarm device of the present invention can achieve a secure lock on the housing through the mounting ears; secondly, the reflective strip is made of high-brightness, wide-angle reflective material, which can efficiently reflect vehicle lights at night or in low-light environments, significantly improving the visibility of the alarm device in complex traffic environments, and also facilitating the recovery of the device after the main road collapses.

[0018] 3. The alarm device of the present invention effectively achieves the organic unity of reliable triggering, convenient maintenance and scene adaptability through the ground switch module, avoiding misjudgment or missed alarm caused by environmental interference or structural loosening. It is particularly suitable for real-time monitoring and rapid early warning of abnormal changes in road structure in complex geological environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the alarm device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the box body according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the ground switch module according to an embodiment of the present invention; Figure 4 This is a top view of the lower part of the main body in an embodiment of the present invention; Figure 5 This is a flowchart illustrating the steps of using the alarm device according to an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-box, 11-mounting lug, 12-antenna window, 13-reflective strip, 2-ground switch module, 21-ground switch body, 21a-bearing cavity, 21b-upper part of body, 21c-lower part of body, 22-conductive ball, 23-conductive sheet, 24-support plate, 3-power management module, 31-battery, 32-self-locking electronic switch, 4-communication alarm module, 41-communication sub-module, 42-processor, 43-local alarm sub-module, 44-communication bus, 45-memory, 46-positioning sub-module. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] like Figures 1 to 4 As shown, this invention provides a mechanically triggered alarm device for sudden road collapse, comprising: a housing 1, a ground-start switch module 2, a power management module 3, and a communication alarm module 4; multiple housings 1 are spaced at intervals along the length of the road on both sides of the road, serving as mounting carriers and protective shells for each module; the ground-start switch module 2 comprises: a ground-start switch body 21, conductive balls 22 and conductive plates 23 disposed within the ground-start switch body 21; the conductive plates 23 are electrically connected to the power management module 3, and multiple conductive plates 23 are arranged in pairs symmetrically; the power management module 3 is electrically connected to the communication alarm module 4; when the road collapses, the conductive balls 22 are in an initial static position, separated from the paired conductive plates 23; when the road collapses, the conductive balls 22 are affected by vibration or tilting, leaving their initial static position and simultaneously contacting at least one pair of symmetrically arranged conductive plates 23; the power management module 3 receives a conduction signal and supplies power to the communication alarm module 4, ensuring that the communication alarm module 4 continuously operates and sends alarm information. The alarm device of this invention is based on modularity, low coupling, and mechanical triggering. It has a simple structure, low cost, and is easy to deploy and maintain. Furthermore, it does not rely on external networks or complex data processing systems. It can effectively make up for the shortcomings of existing technologies in road structure collapse early warning and is particularly suitable for road safety monitoring in remote mountainous areas and areas prone to geological disasters.

[0023] like Figure 1 and Figure 2As shown, the housing 1 is mainly made of stainless steel, and the surface is phosphated and then sprayed with epoxy resin powder to significantly improve waterproof and dustproof performance, resist corrosion from complex environments such as moisture and dust, extend the service life of the equipment, and reduce maintenance costs.

[0024] In an optional embodiment, the spacing between the boxes 1 is 30m to 50m, in order to reduce the cost of use while meeting the requirement of all-weather monitoring of the main road structure.

[0025] In an optional embodiment, the housing 1 is a rectangular body with a detachable panel at the front end and a multi-layer structure inside (not shown in the figure) to provide independent installation space, thereby avoiding interference between modules and simplifying the wiring and debugging process, adapting to the needs of large-scale production and later maintenance.

[0026] In an optional embodiment, the housing 1 further includes a plurality of mounting lugs 11 and reflective strips 13 disposed on its outer surface. It is understood that the mounting lugs 11 enable a secure locking of the housing 1; secondly, the reflective strips 13 are made of high-brightness, wide-angle reflective material, enabling efficient reflection of vehicle lights at night or in low-light environments, significantly improving the visibility of the alarm device in complex traffic environments, and also facilitating the recovery of the device after the main road structure collapses.

[0027] In an optional embodiment, the surface of the housing 1 is provided with multiple antenna windows 12 to reserve channels for alarm information transmission and ensure unobstructed transmission of communication signals.

[0028] In an optional embodiment, the antenna window 12 is embedded with a window plate made of a wave-transparent material, the edge of which is sealed to the antenna window 12 via a sealing structure (not shown in the figure). Optionally, the window plate may be a ceramic-liquid crystal polymer composite substrate, the edge of which is sealed to the annular groove inside the antenna window 12 via a rubber sealing ring (not shown in the figure), and an annular FSS (Frequency Selective Surface) is embedded therein to maintain the overall waterproof performance of the enclosure 1, ensure efficient transmission of alarm information, and improve the device's resistance to electromagnetic interference, making it adaptable to complex electromagnetic environments in various scenarios.

[0029] It should be noted that the sealing structure between the window panel and the antenna window 12 is a common sealing structure for closed doors and windows in the prior art, such as a sealing ring and a sealing groove. As long as the window panel and the antenna window can be firmly connected and kept sealed, it is acceptable. No specific limitation is made here.

[0030] like Figure 3 and Figure 4As shown, the ground switch body 21 is a rectangular body with a spherical cavity inside. A bearing cavity 21a for accommodating the conductive sheet 23 is provided on the inner wall of the spherical cavity. The conductive sheet 23 is fixed in the bearing cavity 21a and is electrically connected to the power management module 3 through a wire passing through the ground switch body 21. The ground switch body 21 is divided into a detachable upper body 21b and a lower body 21c by a horizontal cross section passing through the center of its spherical cavity.

[0031] Furthermore, the number of the bearing cavities 21a is at least one. In an optional embodiment, there are six bearing cavities 21a, with two located at the upper and lower poles of the inner wall of the spherical cavity, and four evenly distributed along the horizontal equatorial plane of the inner wall of the spherical cavity. It should be noted that the X-axis, Y-axis, and Z-axis are three axes of a coordinate system with the center of the spherical cavity as the origin, and the XY plane is horizontal. This XY plane divides the bearing cavity 21a at the intersection of the X-axis and Y-axis into two equal halves, that is, these four bearing cavities 21a are respectively located on the upper part 21b and the lower part 21c end face of the body.

[0032] In an optional embodiment, the bearing cavity 21a is inverted V-shape. It should be noted that in other embodiments, the bearing cavity 21a may also be other shapes, such as arc-shaped cavity, U-shaped cavity, hemispherical, etc., as long as the conductive ball 22 can simultaneously contact the two conductive sheets 23 in one bearing cavity 21a at a certain speed. The present invention does not impose specific limitations on this.

[0033] Furthermore, the ground switch module 2 also includes a support plate 24, which is horizontally disposed within the lower part 21c of the main body. The support plate 24 has a conical through-hole in its center that matches the conductive ball 22. The diameter of this conical through-hole gradually decreases along the vertical downward direction and is three-quarters to one-third of the diameter of the conductive ball 22. It should be noted that when the conductive ball 22 is placed in the conical through-hole in the center of the support plate 24, it is in its initial static position. By setting the support plate 24 to be non-parallel to the X-axis and Y-axis of the spherical cavity, the conductive ball 22 can be prevented from falling into the bearing cavity 21a at the intersection of the X-axis and Y-axis due to obstruction by the support plate 24.

[0034] In an optional embodiment, the ground switch body 21 is mainly made of transparent plastic material to facilitate debugging.

[0035] It is understandable that, through the above design, the ground motion switch module 2 effectively achieves the organic unity of reliable triggering, convenient maintenance and scenario adaptability, avoiding misjudgment or missed reporting caused by environmental interference or structural loosening, and is particularly suitable for real-time monitoring and rapid early warning of abnormal changes in road structure in complex geological environments.

[0036] like Figure 1 As shown, the power management module 3 includes a battery 31 and a self-locking electronic switch 32. The battery 31 is electrically connected to the self-locking electronic switch 32, the communication alarm module 4, and a conductive sheet 23 located in one of the bearing cavities 21a. The self-locking electronic switch 32 is electrically connected to the communication alarm module 4 and another conductive sheet 23 located in the same bearing cavity 21a. Preferably, the self-locking electronic switch 32 is a circuit containing a bistable relay. It can be understood that a bistable relay is an electromagnetic relay with two stable states (on / off). Its core feature is that it can maintain its current state without continuous power supply, and only requires a short pulse current when switching. This characteristic makes it significantly advantageous in low-power consumption and energy-saving control scenarios, and is especially suitable for the alarm device of this invention.

[0037] It should be noted that the battery 31 is a commonly used battery in the prior art, such as a 12V / 2000mAh lithium polymer battery. In other embodiments, other types of batteries may also be used, which are not specifically limited here.

[0038] It should be noted that in other embodiments, the self-locking electronic switch 32 may also include a self-holding circuit composed of a common relay and logic circuit. As long as the conductive ball 22 can trigger the self-locking electronic switch 32 after the main road collapses, so that it forms a stable and continuously conducting electrical circuit with the battery 31 and the communication alarm module 4, the device's requirement for continuous transmission of alarm signals is met, and the function of one-time triggering and long-term conduction is realized. The present invention does not impose specific limitations on this.

[0039] Understandably, through the above design, when the collapse impact causes the conductive ball 22 to bridge the two conductive plates 23, the instantaneous pulse triggers the internal bistable relay via the self-locking electronic switch 32, causing the relay to flip from the normally open state to the closed state and mechanically lock. It can maintain conduction without continuous driving current, thereby switching the battery 31 to the communication alarm module 4 at full power without delay, ensuring continuous transmission of alarm signals. Secondly, the mechanical latching characteristic of the bistable relay allows it to remain unchanged in the event of power drop, electromagnetic interference, or cable damage, completely eliminating the problem of traditional metal-oxide-semiconductor field-effect transistors being falsely reset due to parasitic parameters or surges. In addition, this design not only improves the continuity and stability of device operation, but also significantly reduces overall power consumption, extends the service life of the battery 31, and reduces maintenance frequency and operating costs.

[0040] like Figure 1As shown, the communication alarm module 4 includes: a communication submodule 41, a processor 42, a local alarm submodule 43, a communication bus 44, and a memory 45; the communication submodule 41 supports bidirectional communication; the communication bus 44 is used to realize the connection and communication of the various components within the communication alarm module 4.

[0041] It is understood that the communication submodule 41 may include cellular networks (such as GSM / GPRS, 3G, 4G Cat-M1 / NB-IoT, 5G modules), satellite communications (such as Iridium, Inmarsat, Globalstar modules), and LPWAN (such as LoRaWAN, Sigfox modules). The processor 42 may be a central processing unit (CPU), which may also be other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Furthermore, the general-purpose processor may be a microprocessor or any conventional processor. The local alarm submodule 43 includes a buzzer that enters an intermittent sounding mode after power-on until the external power is cut off or the system is manually reset. The memory 45 may be high-speed RAM or non-volatile memory, such as at least one disk storage device. Optionally, the memory 45 may also be at least one storage device located remotely from the processor 42. Furthermore, the memory 45, as a computer-readable storage medium, may include an operating system and device control applications.

[0042] In an optional embodiment, the communication submodule 41 is a mobile communication unit. Optionally, it is a GSM communication unit and uses a SIM800L module, supporting 900 / 1800MHz dual-band, with a built-in SIM card slot (supporting China Mobile, China Unicom, China Telecom, and China Broadcasting Network SIM cards), and three preset receiving numbers.

[0043] In an optional embodiment, the buzzer is model SFM-27, and its intermittent sounding mode is 0.5s on and 0.5s off, with a sound pressure level of 120dB@1m.

[0044] In an optional embodiment, the communication alarm module 4 further includes a positioning submodule 46, which is a satellite positioning module, and optionally a GNSS (Global Navigation Satellite System) chipset that supports multiple satellite systems (such as GPS, BeiDou, GLONASS, Galileo).

[0045] Understandably, through the above design, when the main road structure collapses suddenly and the communication alarm module 4 is powered on, the processor 42 can call the device control application stored in the memory 45 to achieve the following: the communication submodule 41 repeatedly sends alarm information containing device code, location, and timestamp every 30 seconds, and the local alarm submodule 43 intermittently sounds an audio alarm until the battery is exhausted or manually reset; the location information includes preset and real-time latitude and longitude, thereby achieving precise positioning of the alarm device, and can also be used to preliminarily predict the scope, affected area, and potential hazard level of the road structure collapse, providing data support for subsequent traffic control, engineering repair, and risk assessment.

[0046] like Figure 5 As shown, a second aspect of the present invention provides a method for using a mechanically triggered alarm device for sudden collapse of a road structure, comprising the following steps: S1: Test the alarm device for normal operation by artificial vibration, and input the device code and preset position information into the memory 45 of the communication alarm module 4; S2: Mark the installation points on both sides of the road to be installed, pre-install the box 1 at the marked position, ensure that the internal conductive balls 22 are in the initial static position, then firmly fix the box 1 and put the device into standby mode. S3: When the main body of the road suddenly collapses, the conductive ball 22 rolls and simultaneously contacts the two conductive plates 23 in a bearing cavity 21a, triggering the self-locking electronic switch 32 to enter the self-locking state, so that the battery 31 supplies power to the communication alarm module 4 and periodically sends alarm information containing device code, location and timestamp. At the same time, the local alarm submodule 43 starts the alarm.

[0047] In an optional embodiment, the method of use further includes the step of: the triggered alarm device being retrieved by staff and repaired or scrapped depending on the extent of the damage.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0050] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it; those skilled in the art will readily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanically triggered alarm device for sudden collapse of the main road structure, characterized in that, include: The enclosure (1), the ground switch module (2), the power management module (3), and the communication alarm module (4) are as follows: Multiple boxes (1) are spaced at intervals along the length of the road on both sides of the road, serving as the mounting carrier and protective shell for each module; The ground switch module (2) includes: a ground switch body (21), a conductive ball (22) and a conductive sheet (23) disposed in the ground switch body (21); the conductive sheet (23) is electrically connected to the power management module (3), and multiple conductive sheets (23) are arranged in pairs symmetrically; The power management module (3) is electrically connected to the communication alarm module (4); When the main road body is not collapsed, the conductive ball (22) is in the initial static position and is separated from the paired conductive plates (23). When the main road body collapses, the conductive ball (22) is affected by vibration or tilting and leaves the initial static position, and at the same time contacts at least one pair of symmetrically arranged conductive plates (23). The power management module (3) receives the conduction signal and supplies power to the communication alarm module (4) to ensure that the communication alarm module (4) continues to work and send alarm information.

2. The alarm device according to claim 1, characterized in that, The ground switch body (21) is a rectangular body with a spherical cavity inside and a bearing cavity (21a) for accommodating the conductive sheet (23) on the inner wall of the spherical cavity. The conductive sheet (23) is fixed in the bearing cavity (21a) and is electrically connected to the power management module (3) through a wire passing through the ground switch body (21). The ground switch body (21) is divided into a detachable upper body (21b) and a lower body (21c) by a horizontal cross section passing through the center of its spherical cavity.

3. The alarm device according to claim 2, characterized in that, The ground switch module (2) also includes a support plate (24), which is horizontally disposed in the lower part (21c) of the main body; The support plate (24) has a conical through hole in the middle that is adapted to the conductive ball (22). The diameter of the conical through hole gradually decreases in the vertical downward direction and is three-quarters to one-third of the diameter of the conductive ball (22).

4. The alarm device according to claim 3, characterized in that, The power management module (3) includes: a storage battery (31) and a self-locking electronic switch (32); The battery (31) is electrically connected to the self-locking electronic switch (32), the communication alarm module (4), and a conductive sheet (23) located in a bearing cavity (21a); The self-locking electronic switch (32) is electrically connected to the communication alarm module (4) and another conductive sheet (23) located in the same bearing cavity (21a); The self-locking electronic switch (32) is a circuit that includes a bistable relay.

5. The alarm device according to claim 4, characterized in that, The communication alarm module (4) includes: a communication submodule (41), a processor (42), a local alarm submodule (43), a communication bus (44), and a memory (45). The communication submodule (41) supports bidirectional communication; The communication bus (44) is used to realize the connection and communication of various components in the communication alarm module (4).

6. The alarm device according to claim 5, characterized in that, The communication submodule (41) is a mobile communication unit; The local alarm submodule (43) includes a buzzer, model SFM-27, which has an intermittent sounding mode of 0.5s on and 0.5s off, with a sound pressure level of 120dB@1m.

7. The alarm device according to claim 5, characterized in that, The communication alarm module (4) also includes a positioning submodule (46), which is a satellite positioning module.

8. The alarm device according to any one of claims 1-7, characterized in that, The spacing between the boxes (1) is 30m to 50m; The box (1) is rectangular in shape, with a detachable panel at the front end and a multi-layer structure inside; The enclosure (1) also includes multiple mounting lugs (11) and reflective strips (13) on its outer surface.

9. The alarm device according to any one of claims 1-7, characterized in that, The surface of the housing (1) is provided with multiple antenna windows (12), and the antenna windows (12) are inlaid with window plates made of wave-transparent material. The edge of the window plate is sealed to the antenna window (12) through a sealing structure.

10. The alarm device according to any one of claims 1-7, characterized in that, The ground switch body (21) is mainly made of transparent plastic material.

11. A method of using a mechanically triggered alarm device for sudden collapse of a road structure, implemented using an alarm device as described in any one of claims 1-10, characterized in that, Includes the following steps: S1: Test the alarm device to ensure it is working properly by artificial vibration, and input the device code and preset position information into the memory (45) of the communication alarm module (4); S2: Mark the installation points on both sides of the road to be installed, pre-install the box (1) at the marked position, ensure that the internal conductive balls (22) are in the initial static position, then firmly fix the box (1) and enter the standby state; S3: When the main body of the road collapses suddenly, the conductive ball (22) rolls and simultaneously contacts two conductive plates (23) in a bearing cavity (21a), triggering the self-locking electronic switch (32) to enter the self-locking state, so that the battery (31) supplies power to the communication alarm module (4) and periodically sends alarm information containing device code, location and timestamp. At the same time, the local alarm submodule (43) starts the alarm.

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