Mechanical warning equipment for road night risk identification

Abstract

The invention relates to the technical field of road warning, and particularly discloses mechanical warning equipment for road night risk identification, which comprises a sensing assembly, a triggering assembly and a warning assembly, the sensing assembly comprises a pre-tightening steel rope, a load sensing piece is arranged on the pre-tightening steel rope, the load sensing piece is connected with a pre-embedded sensing piece, and the pre-embedded sensing piece is arranged in a bridge or a side slope; the triggering assembly comprises a triggering rope; one end of the trigger rope is connected to the pre-tightening steel rope, and the other end is connected with a release pin; the warning assembly comprises a stand column, and a first warning board is fixedly installed on the stand column. The warning board further comprises a second warning board, the bottom of the second warning board is hinged to the bottom of the first warning board, and different information is displayed. After collapse and subsidence accidents occur, the pre-tightening steel rope at the sensing contact point generates pulling force under the action of large displacement, the pulling force is further transmitted to the release pin through the trigger rope, and after the release pin is pulled out, the folding signboard is unfolded, a traffic forbidding sign is displayed, and warning information is provided for rear vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of road warnings, and in particular to a mechanical warning device for identifying risks on roads at night. Background Art

[0002] In recent years, many highway collapse and subsidence incidents have occurred in my country, causing a large number of casualties and huge property losses, exposing the inadequacy of the detection and warning capabilities of relevant warning equipment for major highway emergencies. For collapse and subsidence accidents of important structures (bridges, tunnel entrances, etc.) and high-risk slopes on dangerous sections of ordinary highways at night, it is necessary to send warning information to the vehicles behind, providing the last line of safety for vehicles approaching the major disaster site to avoid major casualties.

[0003] At present, when important structures (bridges, tunnel entrances, etc.) and high-risk slopes on dangerous sections of ordinary roads collapse or sink at night, cars driving at night are prone to secondary accidents. Existing warning equipment usually requires power supply for image recognition or uses sensors for risk identification, and has requirements for the power environment and temperature. Summary of the invention

[0004] The purpose of the present invention is to provide a mechanical warning device for nighttime road risk identification. When important structures (bridges, tunnel entrances, etc.) and high-risk slopes on dangerous sections of ordinary roads collapse or sink at night, the device immediately sends a warning message to the vehicles behind, thereby providing the last line of safety for vehicles approaching the scene of a major disaster, avoiding major casualties, and being independent of the power environment, temperature and other conditions.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A mechanical warning device for identifying nighttime road risks comprises a sensing component, a triggering component and a warning component; the sensing component comprises a pre-tensioning steel rope, a load sensing part is arranged on the pre-tensioning steel rope, the load sensing part is connected to a pre-buried sensing part, and the pre-buried sensing part is arranged in a bridge or a slope; the triggering component comprises a triggering rope; one end of the triggering rope is connected to the pre-tensioning steel rope, and the other end is connected to a release pin; the warning component comprises a column, a first warning sign is fixedly mounted on the column; the warning component also comprises a second warning sign, the bottom of the second warning sign is hinged to the bottom of the first warning sign, and different information is displayed by folding and unfolding the second warning sign; when the second warning sign is unfolded, the first warning sign and the second warning sign jointly display road collapse warning information; the second warning sign is provided with an insertion rod, the insertion rod passes through the first warning sign and is connected to the release pin, the release pin restricts the insertion rod and thus restricts the unfolding of the second warning sign, and when the release pin is pulled, the second warning sign unfolds.

[0006] Furthermore, the outer sleeve of the insertion rod is provided with a spring, and the spring is located between the first warning sign and the second warning sign.

[0007] Furthermore, a waterproof cover is installed on the top of the first warning sign, and the waterproof cover covers the second warning sign and the spring in a normal state.

[0008] Furthermore, a plurality of pre-tensioning steel ropes are provided, each of which covers different sections of the slope or bridge through a connected load sensing component and a pre-embedded sensing component, and each pre-tensioning steel rope is connected to a similar warning component covering a road or bridge section.

[0009] Furthermore, it also includes a steering wheel, the trigger rope passes around the steering wheel, and the steering wheel adjusts the force transmission path of the trigger rope.

[0010] Furthermore, a buffer block is installed at the lower end of the column, and the buffer block is used to buffer the unfolded second warning sign, thereby reducing the impact of the second warning sign falling on the column when it is unfolded.

[0011] Furthermore, when the second warning sign is folded, the distance information of the road is displayed.

[0012] A mechanical warning device for identifying nighttime road risks comprises a plurality of warning components, which are arranged along roads or bridges and are denoted as J1, J2, J3, etc. The warning components comprise a column on which a first warning sign is fixedly mounted; a second warning sign is also included, the bottom of the second warning sign is hinged to the bottom of the first warning sign, and different information is displayed by folding and unfolding the second warning sign; when the second warning sign is unfolded, the first warning sign and the second warning sign jointly display road collapse warning information; a plug is provided on the second warning sign; a sensing component is also included, and different numbers of sensing components are provided according to the road or bridge conditions, a single sensing component is used for ordinary roads and one-span bridges; one or more sensing components are used for multi-span bridges according to the length of the bridge, and it is ensured that multiple warning components are provided on the multi-span bridges. Multiple warning components on the bridge divide the multi-span bridge into multiple sections. The entire section is covered by one sensing component, and another sensing component is offset by one section to cover it. Another sensing component is offset by another section to cover it, and so on. The sensing component includes a pre-tensioned steel rope, on which a load sensing component is provided. The load sensing component is connected to a pre-embedded sensing component, and the pre-embedded sensing component is arranged in the bridge or on the slope. It also includes a trigger component, and each warning component uses a trigger component to separately connect the warning components within the coverage range. The trigger component includes a trigger rope; one end of the trigger rope is connected to the pre-tensioned steel rope, and the other end is connected to a release pin; the insertion rod passes through the first warning sign and is connected to the release pin, and the release pin limits the insertion rod and thus limits the deployment of the second warning sign. When the release pin is pulled, the second warning sign is deployed.

[0013] Preferably, the warning components are arranged at an interval distance of 100m.

[0014] Preferably, when the total length of the multi-span bridge is not more than 100 m, one sensing component is used; when the total length of the multi-span bridge is more than 100 m, multiple sensing components are used.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Normal and stable operation in outdoor extreme environments: The device consists of sensing components, trigger components and warning components to assist in night-time risk identification and warning. It has a simple structure and a clear force transmission path. It is highly adaptable to outdoor extreme conditions such as high altitude, high temperature, low sunlight intensity, heavy rain, blizzard, lightning strikes, etc.

[0016] 2. No power supply required: The device does not require power supply. It only relies on the pre-tensioned steel rope to be pulled and transmit force to the release pin to trigger the warning component.

[0017] 3. It can work normally and stably even at night. After the second warning sign is triggered, it can continue to play a warning effect and work uninterruptedly for 24 hours.

[0018] 4. Low cost, high reliability, maintenance-free, long life: The equipment only needs to customize embedded sensing parts, pre-tightening steel ropes, second warning signs, release pins, columns and steering wheels. The process is simple, the production is convenient, the raw materials are extensive, and most of the finished parts do not need to be customized, so the product cost is low. It adopts mechanical induction, triggering, and warning, which is more reliable than electrical products. After doing a good job of anti-corrosion, it has the characteristics of maintenance-free and long life.

[0019] 5. Meet the requirements for identifying nighttime risks: The first and second warning signs are made of highly reflective materials and have multiple warning components, making it easier for drivers to receive warning information and perform emergency braking when driving at night. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the safe braking distance for a small car.

[0021] Figure 2 This is a graph showing the relationship between braking distances at different speeds for a small car.

[0022] Figure 3 Schematic diagram of the layout of embedded sensing parts at bridge disaster points (one-span bridge).

[0023] Figure 4 Schematic diagram of the layout of one sensing unit per span of a bridge.

[0024] Figure 5 Schematic diagram of the layout of a sensing unit for a multi-span bridge.

[0025] Figure 6 Schematic diagram of the arrangement of multiple sensing units on a multi-span bridge.

[0026] Figure 7 Schematic diagram of the layout of a sensing unit on the slope.

[0027] Figure 8 Schematic diagram of the arrangement of multiple sensing units on the slope.

[0028] Fig. 9 This is a schematic diagram of the layout of the induction embedded parts and pre-tensioned steel cables for the external bridge at the tunnel entrance.

[0029] Fig.10 This is a schematic diagram of the layout of the induction embedded parts and pre-tensioned steel ropes for the road outside the tunnel entrance.

[0030] Fig.11 Schematic diagram of the force transmission path.

[0031] Fig.12 This is a general status diagram of the alert component.

[0032] Fig.13 This is an emergency status diagram of the warning component.

[0033] Fig.14 for Fig.12 Enlarged view of point A.

[0034] Icon description: 1-column, 2-first warning sign, 3-second warning sign, 4-rod, 5-spring, 6-release pin, 7-buffer block. DETAILED DESCRIPTION

[0035] The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention, so as to have a further understanding of the concept of the present invention, the technical problems solved, the technical features constituting the technical scheme and the technical effects brought about.

[0036] The road in the title of this application is a broad concept that includes the slopes on both sides, bridges and tunnels, etc.

[0037] like Figure 3 , Fig.14 As shown, a road night risk identification and warning device includes a sensing component, a triggering component and a warning component; the sensing component includes a pre-tensioned steel rope, on which a load sensing component is arranged, the load sensing component is connected to a pre-embedded sensing component, and the pre-embedded sensing component is arranged in a bridge or a slope; the triggering component includes a triggering rope; one end of the triggering rope is connected to the pre-tensioned steel rope, and the other end is connected to a release pin 6.

[0038] like Figure 12~Figure 14As shown, the warning component includes a column 1, on which a first warning sign 2 is fixedly installed; it also includes a second warning sign 3, the bottom of the second warning sign 3 is hinged to the bottom of the first warning sign 2, and different information is displayed by folding and unfolding the second warning sign 3; when the second warning sign 3 is unfolded, the first warning sign 2 and the second warning sign 3 jointly display road collapse warning information; the second warning sign 3 is provided with an insertion rod 4, the insertion rod 4 passes through the first warning sign 2 and is connected to the release pin 6, the release pin 6 limits the insertion rod 4 and thus limits the unfolding of the second warning sign 3, and when the release pin 6 is pulled, the second warning sign 3 is unfolded.

[0039] In view of the large displacement of roads, bridges, tunnel entrances and high-risk slopes when they collapse or sink, the pre-tightened steel rope at the set induction contact point is subjected to the large displacement to generate tension, and the tension is further transmitted to the release pin 6 through the trigger rope. After the release pin 6 is pulled out, the folding sign is unfolded to display a no-passing traffic sign with reflective characteristics, providing warning information for the rear vehicles. In the warning component, the bottoms of the first warning sign 2 and the second warning sign 3 are connected by hinges, and the second warning sign 3 is provided with a plug rod 4, which passes through the first warning sign 2 and is connected to the release pin 6. The release pin 6 limits the plug rod 4 and then limits the unfolding of the second warning sign 3. The release pin 6 limits the state of the second warning sign 3 to the normal state. After the collapse of the slope, bridge, etc., the induction embedded parts are driven to undergo large displacement, the load sensing parts are pulled off, the pre-tightened steel rope is retracted, the trigger rope is pulled, and the release pin 6 is pulled out, and then the second warning sign 3 is quickly unfolded under the action of its own weight, and the distance sign becomes a warning sign, which is an emergency state. The warning signal has a short delay time. Once a disaster occurs, the warning sign will be deployed quickly, and the driver will be prompted to brake urgently by using the reflection of the night lights. The device can provide emergency prompts to the driver and effectively respond to emergencies. It does not require power supply and is triggered quickly and automatically.

[0040] Furthermore, the outer sleeve of the insertion rod 4 is provided with a spring 5, and the spring 5 is located between the first warning sign 2 and the second warning sign 3. The spring 5 provides a thrust to the second warning sign 3 in an emergency state, so that the second warning sign 3 can be deployed more quickly.

[0041] Further, a waterproof cover is installed on the top of the first warning sign 2, and the waterproof cover covers the second warning sign 3 and the spring 5 in the normal state. In order to prevent the spring 5 and the release pin 6 from being rusted by rainwater, the waterproof cover is designed to shield them.

[0042] Furthermore, the pre-tensioning steel ropes are provided in plurality, each of which covers different sections of the road or bridge through the connected load sensing components and the embedded sensing components, and each pre-tensioning steel rope is connected to a similar warning component covering the slope or bridge section. Multiple pre-tensioning steel ropes are used to cover different sections, and when collapse occurs in different sections, the warning components of different sections are triggered to achieve a more accurate warning effect.

[0043] like Fig.11 As shown, further, it also includes a steering wheel, the trigger rope passes around the steering wheel, and the steering wheel adjusts the force transmission path of the trigger rope.

[0044] Furthermore, a buffer block 7 is installed at the lower end of the column 1, and the buffer block 7 is used to buffer the unfolded second warning sign 3, so as to reduce the impact of the second warning sign 3 falling on the column 1 when it is unfolded.

[0045] Furthermore, when the second warning sign 3 is folded, the distance information of the road is displayed.

[0046] like Figure 4~Figure 10 As shown, an automatic warning device for nighttime risk identification of bridges and roads, with specific installation connections in different road conditions: It includes multiple groups of warning components, which are set along the road or bridge and are recorded as J1, J2, J3...; The warning component includes a column 1, on which a first warning sign 2 is fixedly mounted; and also includes a second warning sign 3, the bottom of the second warning sign 3 is hinged to the bottom of the first warning sign 2, and different information is displayed by folding and unfolding the second warning sign 3; when the second warning sign 3 is unfolded, the first warning sign 2 and the second warning sign 3 jointly display the road collapse warning information; the second warning sign 3 is provided with a plug rod 4; It also includes sensing components. Different numbers of sensing components are set according to the road or bridge conditions. Ordinary roads and one-span bridges use a single sensing component. Multi-span bridges use one or more sensing components according to the length of the bridge, and ensure that multiple warning components are set on the multi-span bridge. The multiple warning components on the multi-span bridge divide the multi-span bridge into multiple sections. The entire section is covered by one sensing component, and another sensing component is offset by one section to cover it. Another sensing component is offset by another section to cover it, and so on. The induction assembly includes a pre-tensioned steel rope, on which a load induction component is arranged, and the load induction component is connected to a pre-embedded induction component, which is arranged in the bridge or the slope; It also includes a trigger component, and each warning component is individually connected to the warning components within the coverage area using the trigger component; The trigger assembly includes a trigger rope; one end of the trigger rope is connected to the pre-tensioned steel rope, and the other end is connected to a release pin 6; the insertion rod 4 passes through the first warning sign 2 and is connected to the release pin 6, the release pin 6 limits the insertion rod 4 and thus limits the deployment of the second warning sign 3, and when the release pin 6 is pulled, the second warning sign 3 is deployed.

[0047] Definition of sensing unit: The sensing unit in the sensing component refers to the disaster location sensing area, and the length of the sensing unit corresponds to the segment length mentioned above.

[0048] Since the span of small and medium span bridges usually does not exceed 50m, the sensing units are divided as follows: 1) One span of bridge forms one sensing unit, and when only one span of bridge connects the road, it only forms one sensing unit; 2) Multiple span bridges form one sensing unit. When multiple span bridges with a short total length connect roads, multiple span bridges can also form one sensing unit. 3) Multi-span bridges form multiple sensing units. When a multi-span bridge with a long total length connects roads, multiple sensing units can be divided.

[0049] When there is only one induction unit, the induction component only needs one pre-tensioned steel rope; when there are multiple induction units, multiple pre-tensioned steel ropes need to be connected in parallel. The specific triggering process is as follows: 1) In a sensing unit, when any span of the bridge collapses, the embedded sensing parts will be displaced greatly, breaking the load sensing parts, causing the pre-tensioned steel rope to retract, pulling the trigger rope and pulling out the release pin 6, triggering the warning components about 200m and 100m behind the accident.

[0050] 2) Among the multiple sensing units, when any span of the bridge in sensing unit 1 collapses, the warning components J1, J2, and J3 will be directly triggered; when any span of the bridge in sensing unit 2 collapses, the warning components J1 to J4 will be directly triggered; when any span of the bridge in sensing unit 3 collapses, the warning components J2 to J5 will be directly triggered, and J1 may also be passively triggered; the triggering of warning components by other sensing units can be deduced in the same way.

[0051] like Figure 1 , Figure 2 As shown, preferably, the interval distance of the warning components is 100m. For ordinary roads, the speed usually does not exceed 80km / h. The longitudinal safety distance of small cars, large and medium-sized passenger and freight vehicles can be taken as 100m. That is, the distance from the disaster accident site to the warning device to remind the driver to start braking shall not be less than 100m. Considering the influence of speeding, heavy rainfall, etc. in the actual operation process, the farthest warning distance is set to 200m and 100m.

[0052] Preferably, when the total length of the multi-span bridge is not more than 100 m, one sensing component is used; when the total length of the multi-span bridge is more than 100 m, multiple sensing components are used.

[0053] For ordinary roads with slopes, in order to improve the stability of the slopes, anchor structures are usually set up. When the road slope sinks, the anchor structure slides at the same time. Therefore, the road disaster sensing component is connected to the anchor point (i.e. the sensing point in the figure) through a sensing steel rope. If the sensing point is inconvenient to operate, the pre-buried steel bar can be re-inserted into the slope to become a new sensing point. The warning component is installed on the outside of the road railing.

[0054] The application scenarios of the present invention are: 1. For bridge collapse at night caused by flood, debris flow, rockfall, ship collision, etc., this device can provide warnings to vehicles behind to reduce casualties.

[0055] 2. For roads that sink at night due to landslides, the device can provide warnings to vehicles behind to reduce casualties.

[0056] 3. It can also be used to warn of collapse or subsidence of bridges and roads in the transition area between bridges and tunnels or roads and tunnels.

[0057] The advantages of the present invention are: 1. Normal and stable operation in outdoor extreme environments: The device consists of sensing components, trigger components and warning components to assist in night-time risk identification and warning. It has a simple structure and a clear force transmission path. It is highly adaptable to outdoor extreme conditions such as high altitude, high temperature, low sunlight intensity, heavy rain, blizzard, lightning strikes, etc.

[0058] 2. No power supply required: The device does not require power supply. It only relies on the pre-tensioned steel rope to be pulled and transmit force to the release pin 6 to trigger the warning component.

[0059] 3. It can work normally and stably at night. After the second warning sign 3 is triggered, it can continue to play a warning effect and work uninterruptedly for 24 hours.

[0060] 4. Low cost, high reliability, maintenance-free, long life: The equipment only needs to customize embedded sensing parts, pre-tightening steel rope, second warning sign 3, release pin 6, column 1 and steering wheel and other parts. The process is simple, the production is convenient, the raw materials are extensive, and most of the finished parts do not need to be customized, and the product cost is low. It adopts mechanical induction, triggering, and warning, which is more reliable than electrical products. After doing a good job of anti-corrosion, it has the characteristics of maintenance-free and long life.

[0061] 5. Meeting the requirements for identifying nighttime risks: The first warning sign 2 and the second warning sign 3 are made of highly reflective materials and have multiple warning components arranged to make it easier for drivers to receive warning information and perform emergency braking when driving at night.

[0062] Design of force transmission path: Based on the preferred 100m warning distance in this technical solution, warning components are set at 100m and 200m away from each sensing unit along the direction of vehicle travel, and steering wheels are pre-buried at this position to clarify the force transmission path from the pre-tightening steel rope, trigger rope to the release pin 6. Through experimental testing, the critical breaking load of the load sensing component and the pre-tightening force of the steel rope are optimized, and reasonable structural parameters are determined to ensure that the load sensing component is pulled apart after the disaster. The trigger rope is consolidated with the pre-tightening steel rope, and the retraction force after the load sensing component is pulled apart and the tension of the bridge collapse or road subsidence are used to bypass the steering wheel, pull the trigger rope to pull out the release pin 6, and avoid damage to the warning sign by the tension of the steel rope. Compare the effects of the size parameters of the release pin 6 on the pull-out force to ensure that the trigger rope can pull out the release pin 6 smoothly.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mechanical warning device for nighttime road risk identification, characterized in that: It includes a sensing component, a triggering component and a warning component; the sensing component includes a pre-tensioned steel rope, a load sensing component is arranged on the pre-tensioned steel rope, the load sensing component is connected to a pre-buried sensing component, and the pre-buried sensing component is arranged in the bridge or slope; The trigger assembly includes a trigger rope; one end of the trigger rope is connected to the pre-tensioned steel rope, and the other end is connected to a release pin; The warning component includes a column, on which a first warning sign is fixedly mounted; and also includes a second warning sign, the bottom of which is hinged to the bottom of the first warning sign, and different information is displayed by folding and unfolding the second warning sign; when the second warning sign is unfolded, the first warning sign and the second warning sign jointly display the road collapse warning information; The second warning sign is provided with an insertion rod, which passes through the first warning sign and is connected to the release pin. The release pin restricts the insertion rod and further restricts the deployment of the second warning sign. When the release pin is pulled, the second warning sign is deployed.

2. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: The outer sleeve of the insertion rod is provided with a spring, and the spring is located between the first warning sign and the second warning sign.

3. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: A waterproof cover is installed on the top of the first warning sign, and the waterproof cover covers the second warning sign and the spring in a normal state.

4. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: There are multiple pre-tensioning steel ropes, each of which covers different sections of the slope or bridge through the connected load sensing parts and the embedded sensing parts. Each pre-tensioning steel rope is connected to a similar warning component covering the road or bridge section.

5. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: It also includes a steering wheel, the trigger rope is passed around the steering wheel, and the steering wheel adjusts the force transmission path of the trigger rope.

6. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: A buffer block is installed at the lower end of the column, and the buffer block is used to buffer the unfolded second warning sign.

7. The mechanical warning device for nighttime road risk identification according to claim 1 is characterized by: When the second warning sign is folded, the distance information of the road is displayed.

8. A mechanical warning device for nighttime road risk identification, characterized in that: The invention comprises a plurality of warning components, which are arranged along the road or bridge, and are recorded as J1, J2, J3, etc.; the warning component comprises a column, on which a first warning sign is fixedly mounted; and a second warning sign, the bottom of which is hinged to the bottom of the first warning sign, and different information is displayed by folding and unfolding the second warning sign; when the second warning sign is unfolded, the first warning sign and the second warning sign jointly display the road collapse warning information; and a plug is arranged on the second warning sign; It also includes sensing components. Different numbers of sensing components are set according to the road or bridge conditions. Ordinary roads and one-span bridges use a single sensing component. Multi-span bridges use one or more sensing components according to the length of the bridge, and ensure that multiple warning components are set on the multi-span bridge. The multiple warning components on the multi-span bridge divide the multi-span bridge into multiple sections. The entire section is covered by one sensing component, and another sensing component is offset by one section to cover it. The next sensing component is offset by another section to cover it, and so on. The sensing component includes a pre-tensioning steel rope, on which a load sensing component is arranged, which is connected to a pre-buried sensing component, and the pre-buried sensing component is arranged in a bridge or a slope; it also includes a trigger component, and each warning component is individually connected to the warning components within the coverage range by a trigger component; the trigger component includes a trigger rope; one end of the trigger rope is connected to the pre-tensioning steel rope, and the other end is connected to a release pin; the insertion rod passes through the first warning sign and is connected to the release pin, the release pin limits the insertion rod and then limits the deployment of the second warning sign, and when the release pin is pulled, the second warning sign is deployed.

9. The mechanical warning device for nighttime road risk identification according to claim 8, characterized in that: The warning components are arranged at an interval of 100m.

10. The mechanical warning device for nighttime road risk identification according to claim 8, characterized in that: When the total length of the multi-span bridge is not more than 100m, one sensing component is used; when the total length of the multi-span bridge is more than 100m, multiple sensing components are used.

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