Culvert ventilation protection device capable of monitoring operation for long time

Abstract

The utility model discloses a culvert ventilation protection device capable of monitoring operation for a long time, which comprises an upstream ventilation and manhole arranged behind an upstream service gate and communicated with the top of a culvert to form a front-end pressure regulating loop; the downstream ventilation and manhole is formed in front of the downstream bulkhead gate and is communicated with the top of the culvert to form a rear-end pressure regulating loop; an intelligent cover plate assembly is arranged at the top of the ventilation and manhole and comprises a circular frame and four sub cover plates; one of the adjacent sub-cover plates is of a hollow structure and can contain the other sub-cover plate. The cover plate assembly achieves 0.5-degree precision adjustment through a hydraulically-driven rotating shaft and is provided with a multi-layer sensor network and an acousto-optic early warning system. According to the utility model, through an accurate and controllable pressure adjusting mechanism, the potential safety hazard that a traditional culvert cover plate is easily jacked up is solved, and the operation safety of a water conservancy project is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy project safety protection, and specifically relates to a monitoring device for culvert ventilation protection. Background Technique

[0002] The culvert is a water diversion structure in a conventional water conservancy project. When operators conduct daily maintenance, they mainly enter through the access hole behind the gate. The access hole is connected to the culvert, and the air pressure changes caused by the water level and pressure changes in the culvert have a great impact on the access hole. When the water level fluctuates greatly or the gate is suddenly closed, if the access hole is a closed structure, the impact energy of the rapidly rising pressure on the cover plate is extremely large, and in severe cases, the cover plate can be lifted, causing harm to the staff in the nearby area.

[0003] In extreme weather, the phenomenon of the access hole cover plate being lifted frequently occurs, which has a great impact on the inspection operation in special weather and threatens the personal safety of operators and the normal operation of the project. Content of the Utility Model

[0004] The purpose of the utility model is to provide a culvert ventilation protection device for long-term monitoring operation, in order to solve the above problems existing in the prior art.

[0005] Technical solution: According to one aspect of the present application, a culvert ventilation protection device for long-term monitoring operation includes:

[0006] An upstream ventilation and access hole, which is arranged behind the upstream working gate and is connected to the top of the culvert to form a front-end pressure regulation loop; a downstream ventilation and access hole, which is arranged in front of the downstream maintenance gate and is connected to the top of the culvert to form a rear-end pressure regulation loop;

[0007] Intelligent cover plate assemblies are arranged on the tops of the upstream ventilation and access hole and the downstream ventilation and access hole; the intelligent cover plate assembly includes a circular frame, four sub-cover plates arranged in the circular frame, a power device for driving the rotation of the sub-cover plates, a sensor for collecting the water level and pressure parameters in the culvert, and a control unit for signal connection with the power device and the sensor;

[0008] Among adjacent sub-cover plates, one of the sub-cover plates is of a hollow structure and can accommodate another sub-cover plate; after receiving a control signal, at least a part of at least one sub-cover plate rotates and is accommodated in the adjacent sub-cover plate.

[0009] According to one aspect of the present application, the upstream ventilation and access hole and the downstream ventilation and access hole are vertically connected to the top of the culvert;

[0010] Ring-shaped reinforcing ribs and sealing structures are provided at the joints of the upstream ventilation and access hole, the downstream ventilation and access hole and the culvert.

[0011] According to one aspect of the present application, the four sub-cover plates include: a first cover plate, a second cover plate, a third cover plate, and a fourth cover plate arranged in sequence in the clockwise direction;

[0012] Among them, the second cover plate and the fourth cover plate are of hollow structures and are respectively used for accommodating the first cover plate and the third cover plate.

[0013] According to one aspect of the present application, the second cover plate and the fourth cover plate are fixedly connected to the circular frame;

[0014] The first cover plate and the third cover plate are respectively connected to a rotating shaft, and the rotating shaft is hydraulically driven.

[0015] According to one aspect of the present application, the rotation range of the rotating shaft is 0° to 90°; the rotation adjustment accuracy of the rotating shaft is 0.5°.

[0016] According to one aspect of the present application, the depth of the hollow cavities of the second cover plate and the fourth cover plate is greater than the thickness of the first cover plate and the third cover plate;

[0017] The planar size of the hollow cavities is greater than the planar size of the first cover plate and the third cover plate;

[0018] The outer edge of the circular frame is coaxially arranged with the top openings of the upstream ventilation and access hole and the upstream and downstream ventilation and access holes;

[0019] The four sub-cover plates are evenly distributed within the circular frame, each occupying one-fourth of the area within the circular frame.

[0020] According to one aspect of the present application, a main rotating shaft fixedly connected to the ground is provided on the outside of the circular frame for realizing the overall flipping of the cover plate.

[0021] According to one aspect of the present application, it further includes:

[0022] A pulsating pressure sensor and a noise sensor arranged on the side wall of the culvert;

[0023] A pulsating pressure sensor, a noise sensor, and a wind speed sensor arranged on the side walls of the upstream ventilation and access hole and the downstream ventilation and access hole;

[0024] And a control unit, which is signal-connected to the pulsating pressure sensor, the noise sensor, the wind speed sensor, and the intelligent cover plate assembly.

[0025] According to one aspect of the present application, pulsating pressure sensors are provided at the central positions of the first cover plate, the second cover plate, the third cover plate, and the fourth cover plate;

[0026] A color-changing light strip and an alarm are provided on the periphery of the circular frame; the alarm includes a sound alarm unit and an optical alarm unit;

[0027] According to one aspect of the present application, the upstream ventilation and access manhole and the downstream ventilation and access manhole are of circular tube structure; a ladder is provided on the inner wall of the circular tube.

[0028] Beneficial effects: precise pressure relief is achieved, avoiding the rough adjustment method of "fully open and fully closed" of traditional covers. It not only improves the operation safety of water conservancy projects, but also provides reliable safety protection for front-line workers. Effectively prevents safety accidents in extreme weather and significantly reduces the project maintenance cost. Description of the Drawings

[0029] Figure 1 It is a schematic cross-sectional view of the device of the present utility model.

[0030] Figure 2 It is a plan view of the cover plate of the device of the present utility model.

[0031] Figure 3 It is a schematic diagram of the rotation of the first and third cover plates of the device of the present utility model.

[0032] Figure 4 It is a schematic diagram of the cover plate of the device of the present utility model flipping around the rotating shaft.

[0033] Among them, the reference numerals are: 1a, upstream water level monitoring station; 1b, downstream water level monitoring station; 2, culvert; 3, pulsating pressure sensor; 4, noise sensor; 5a, upstream maintenance gate; 5b, downstream maintenance gate; 6, working gate; 7a, upstream ventilation and access manhole; 7b, downstream ventilation and access manhole; 8, wind speed sensor; 9, cover plate; 91, first cover plate; 92, second cover plate; 93, third cover plate; 94, fourth cover plate; 95, rotating shaft of the first and third cover plates; 96, circular frame; 97, cover plate rotating shaft (overall flipping). Detailed Embodiments

[0034] As Figure 1 shown, a culvert ventilation protection device for long-term monitoring operation includes:

[0035] An upstream ventilation and access manhole, which is arranged behind the upstream working gate (downstream side) and communicates with the top of the culvert to form a front-end pressure regulation loop; a downstream ventilation and access manhole, which is arranged in front of the downstream maintenance gate (upstream side) and communicates with the top of the culvert to form a rear-end pressure regulation loop;

[0036] Intelligent cover plate assemblies are provided at the tops of the upstream ventilation and access manhole and the downstream ventilation and access manhole; the intelligent cover plate assemblies include a circular frame and four sub-cover plates arranged within the circular frame;

[0037] Among adjacent sub - cover plates, one of the sub - cover plates has a hollow structure and can accommodate the other sub - cover plate; after receiving a control signal, at least a part of at least one sub - cover plate rotates and is accommodated in the adjacent sub - cover plate.

[0038] By respectively arranging air - vent and access holes behind the upstream working gate and in front of the downstream maintenance gate, and forming a front - end and rear - end pressure - regulating loop with the top of the culvert, when a water - hammer phenomenon occurs, the two air - vent holes can work together for pressure regulation, significantly improving the pressure - release efficiency, effectively preventing pressure concentration in the culvert, and ensuring the safety of equipment and personnel.

[0039] In this embodiment, through the partition - type intelligent cover - plate design, combined with a multi - level sensing and monitoring system, precise control of the pressure in the culvert is achieved. The coordinated pressure - regulating mechanism of the two - way air - vent holes, combined with the intelligent early - warning and data - analysis system, not only improves the operational safety of the water conservancy project, but also provides reliable safety protection for front - line workers. This device can effectively prevent safety accidents in extreme weather, significantly reduce the project maintenance cost, provide an innovative solution for the safe operation of the water conservancy project, and has important popularization value.

[0040] According to one aspect of the present application, the upstream air - vent and access hole and the downstream air - vent and access hole are vertically connected to the top of the culvert;

[0041] At the connection of the upstream air - vent and access hole, the downstream air - vent and access hole and the culvert, annular reinforcing ribs and sealing structures are provided.

[0042] According to one aspect of the present application, the four sub - cover plates include: a first cover plate, a second cover plate, a third cover plate, and a fourth cover plate arranged in a clockwise direction in sequence;

[0043] Among them, the second cover plate and the fourth cover plate have hollow structures and are respectively used to accommodate the first cover plate and the third cover plate.

[0044] Adopting a cover - plate structure of "hollow accommodation + precision rotating shaft" realizes an opening - degree adjustment with an accuracy of 0.5°, solving the potential safety hazard of traditional cover - plate jacking hurting people.

[0045] According to one aspect of the present application, the second cover plate and the fourth cover plate are fixedly connected to a circular frame;

[0046] The first cover plate and the third cover plate are respectively connected to a rotating shaft, and the rotating shaft is driven by hydraulic pressure.

[0047] According to one aspect of the present application, the rotation range of the rotating shaft is 0° - 90°; the rotation - adjustment accuracy of the rotating shaft is 0.5°.

[0048] According to one aspect of the present application, the depth of the hollow cavities of the second cover plate and the fourth cover plate is greater than the thickness of the first cover plate and the third cover plate;

[0049] The planar dimension of the hollow cavity is greater than the planar dimensions of the first cover plate and the third cover plate;

[0050] The outer edge of the circular frame is coaxially arranged with the top openings of the upstream ventilation and access holes and the upstream and downstream ventilation and access holes;

[0051] The four sub-cover plates are evenly distributed within the circular frame, each occupying one-fourth of the area within the circular frame.

[0052] By designing the cover plate as a structure with four sub-cover plates within a circular frame, where two adjacent cover plates adopt a "one hollow and one solid" paired design and are rotationally controlled with an accuracy of 0.5° through a precision rotating shaft. When abnormal pressure is detected, the solid cover plate can be rotated and retracted into the adjacent hollow cover plate, achieving precise adjustment of the ventilation area, avoiding the problem of occupying ground space when the traditional cover plate is opened, ensuring the safety of the maintenance passage, and ultimately achieving the dual effects of precise pressure regulation and safety protection.

[0053] In summary, through the hollow retractable intelligent cover plate system, which includes four sub-cover plates, where the second and fourth cover plates are of hollow structure and can accommodate the first and third cover plates. The opening degree of the cover plate is controlled by a hydraulically driven precision rotating shaft (accuracy 0.5°), achieving precise pressure release and avoiding the rough adjustment method of full opening and full closing of the traditional cover plate.

[0054] According to one aspect of the present application, a main rotating shaft fixedly connected to the ground is provided on the outside of the circular frame for realizing the overall flipping of the cover plate.

[0055] According to one aspect of the present application, the sensor includes:

[0056] A pulsating pressure sensor and a noise sensor arranged on the side wall of the culvert;

[0057] A pulsating pressure sensor, a noise sensor, and a wind speed sensor arranged on the side walls of the upstream ventilation and access hole and the downstream ventilation and access hole;

[0058] A control unit, which is signal-connected to the pulsating pressure sensor, the noise sensor, the wind speed sensor, and the intelligent cover plate assembly.

[0059] An upper and lower double ventilation hole structure is adopted and is connected to the top of the culvert to form a pressure regulation loop. A pressure sensor network with high-frequency sampling (>10Hz) is arranged at key positions such as the side wall of the culvert and the wall of the ventilation hole to monitor the water level fluctuation and pressure change in real time. When abnormal pressure is detected, the system can adjust the opening degree of the cover plate in advance to avoid the rapid accumulation of pressure.

[0060] In other words, in this embodiment, pulsating pressure sensors, noise sensors, and wind speed sensors are arranged at key positions such as the side walls of the culvert, the walls of the ventilation holes, and the center of the cover plate, and high-frequency sampling with a frequency greater than 10 Hz is adopted to form a real-time monitoring network for the internal pressure, noise, and wind speed of the culvert, which can timely capture the pressure fluctuations caused by the water hammer effect, realize early warning of sudden pressure events, and greatly reduce the occurrence probability of cover plate jacking accidents.

[0061] In some embodiments, based on a high-performance computer and a historical database, the system can automatically analyze the pressure change trend and calculate the optimal opening angle of the cover plate. By wirelessly transmitting the data of each sensor to the high-performance computer of the water level monitoring station and establishing a pressure-opening response database, the optimal opening angle of the cover plate is automatically calculated through real-time data analysis and comparison with historical data, realizing precise control of the ventilation volume, avoiding the lag of manual operation, and improving the intelligent level and operation stability of the entire system.

[0062] According to one aspect of the present application, pulsating pressure sensors are provided at the central positions of the first cover plate, the second cover plate, the third cover plate, and the fourth cover plate;

[0063] A color-changing light strip and an alarm are arranged on the periphery of the circular frame; the alarm includes a sound alarm unit and an optical alarm unit;

[0064] According to one aspect of the present application, the upstream ventilation and access hole and the downstream ventilation and access hole are of a circular pipe structure; a ladder is arranged on the inner wall of the circular pipe.

[0065] In this embodiment, a color-changing light strip and an audible and visual alarm are equipped to automatically give an early warning when an abnormality occurs, and the pressure is automatically released through the adjustment of the cover plate to ensure the safety of personnel.

[0066] Specifically, a color-changing light strip and an audible and visual alarm are arranged on the periphery of the cover plate frame and are linked with the monitoring system. When the pressure exceeds the threshold, the alarm is automatically triggered and the color of the light strip is changed, providing an intuitive danger warning for the on-site staff, effectively demarcating the safe area, and ensuring the safety of the maintenance operation to the greatest extent.

[0067] In another embodiment of the present application, a culvert ventilation protection device for long-term monitoring operation is provided, which includes an upstream water level monitoring station, a culvert, a pulsating pressure sensor, a noise sensor, an upstream maintenance gate, an upstream working gate, an upstream ventilation and access hole, a wind speed sensor, a cover plate, a downstream ventilation and access hole, a downstream maintenance gate, and a downstream water level monitoring station arranged in sequence along the water flow direction. High-performance computers are provided in both the upstream water level monitoring station and the downstream water level monitoring station for receiving and processing data uploaded by all sensors. The data measured by the water level monitoring station, the pulsating pressure sensor, the noise sensor, and the wind speed sensor are all transmitted wirelessly, and after data collection, they are uploaded to the computer platform. The data collection frequencies of the water level monitoring station, the pulsating pressure sensor, the noise sensor, and the wind speed sensor are all greater than 10HZ. Pulsating pressure sensors and noise sensors are arranged on the side walls of the culvert, the maintenance gate slots, and the working gate slots, and pulsating pressure sensors, noise sensors, and wind speed sensors are arranged on the side walls of the ventilation and access holes. There are thresholds for the data collected by the water level monitoring station, the pulsating pressure sensor, the noise sensor, and the wind speed sensor (the thresholds are adjusted as the data accumulates continuously). After exceeding the thresholds, the high-performance computer analyzes the data and sends an instruction to the cover plate rotating shaft to release the pressure inside the culvert by adjusting the shape of the cover plate, reducing the value and eliminating the danger. The ventilation and access holes are in the shape of round tubes, and ladders are arranged inside the holes to facilitate operators to enter the culvert for maintenance. The cover plate is circular and is arranged on the top of the ventilation and access holes. When the monitoring data is normal, the cover plate is in the closed state, and operators can walk on the cover plate. The outer circle of the cover plate is a circular frame, and the inner side is evenly divided into 4 pieces, numbered as the first cover plate, the second cover plate, the third cover plate, and the fourth cover plate in clockwise order from left to right. Among them, the second cover plate and the fourth cover plate are hollow structures containing cavities, which can accommodate the first and third cover plates to enter completely. Pulsating pressure sensors are arranged at the central positions of the first cover plate, the second cover plate, the third cover plate, and the fourth cover plate. The second cover plate and the fourth cover plate are fixed to the circular frame and move with the cover plate frame. A rotating shaft is arranged between the first cover plate and the third cover plate, and the rotating shaft is driven by hydraulic pressure, and the rotation range is 0° to 90°, and the rotation adjustment accuracy is 0.5°. A rotating shaft is arranged on the outside of the circular frame of the cover plate, and the rotating shaft is connected and fixed to the ground. The cover plate is flipped through the rotating shaft to control the opening and closing of its whole body (including the circular frame + the first to fourth cover plates). A color-changing light strip and an alarm are arranged on the periphery of the circular frame of the cover plate. When the monitoring signal is normal, the cover plate is in the closed state, and at this time, the light strip is green and the alarm does not work; when the monitoring signal is abnormal and the cover plate is being adjusted, at this time, the light strip is red and the alarm sounds and flashes; after the cover plate is adjusted and the monitoring signal returns to normal, the cover plate is in the open state (there is an air flow channel), and at this time, the light strip is yellow and the alarm does not work.

[0068] In the embodiment of the present utility model, in the long-term operation state, a high-performance computer is used to collect a large amount of water level, pressure, noise, and wind speed data and record them, analyze the response relationship between each item of data and the opening angles of the first cover plate and the third cover plate. Based on a large amount of data accumulation, the above response relationship is analyzed and corrected, continuously optimizing and improving the machine operation efficiency, and enhancing the ability of the water diversion project to cope with complex hydraulic conditions.

[0069] The working process is as follows:

[0070] Step 1: When the monitored signal is normal, the cover plates are in the closed state. The first cover plate, the second cover plate, the third cover plate, and the fourth cover plate are all in their initial positions, and the light strips on the outer sides of the cover plates show green.

[0071] Step 21: When the water level upstream or downstream fluctuates greatly (exceeding the threshold) or the gate is suddenly closed (water hammer phenomenon), the water surface and air in the culvert fluctuate accordingly, and the pulsating pressure and noise increase (exceeding the threshold). The pulsating pressure in the ventilation and access manhole also increases with the increase in air pressure, and there is no ventilation. If the cover plates are still in the closed state at this time, it may cause excessive pressure on the inner wall of the culvert, resulting in wall damage, or the top cover plate of the ventilation and access manhole may suddenly be lifted, threatening the safety of the operators.

[0072] Step 22: In the above situation, in the embodiment of the present utility model, first, the computer issues an indicator to turn on the red lights around the cover plates, issue an alarm, prompt danger, and avoid people approaching. Then, it collects real-time pulsating pressure, noise, and wind speed data, compares and analyzes them with the previous data in the database, and calculates the rotation angle of the cover plates. After that, it issues another command to rotate the first cover plate and the third cover plate according to the calculated angle to dredge the air in the tunnel and release the pressure. After the cover plates are rotated, it collects real-time pulsating pressure, noise, and wind speed data again to determine whether they are within the threshold range. If all indicators return to normal, it turns on the yellow lights around the cover plates. If the indicators are still abnormal, it continues to rotate the first cover plate and the third cover plate (or the cover plates are flipped as a whole to the maximum ventilation area) until the monitored data is normal.

[0073] Step 23: After all the data return to normal, the high-performance computer reviews and inverses Step 22. Through a large amount of data during the cover plate adjustment process, it corrects the response relationship between each item of data and the rotation angle of the cover plates, and in the later stage, it can make a positive response plan in advance in combination with information such as hydrological forecasts.

[0074] When any one of the water level, pulsating pressure, or noise exceeds the threshold, the embodiment of the present utility model starts to work.

[0075] In summary, through the sensor monitoring of multiple indicators, the utility model uses a high-performance computer to record and analyze data to form a database, obtains the response relationship between each indicator and the rotation angle of the cover plate, matches the real-time data at each alarm to obtain the optimal rotation angle of the cover plate, and remotely controls the rotation inside the cover plate and the overall flip, greatly avoiding the accident that the cover plate is lifted by water hammer in the tunnel and injuring the operator. At the same time, through the large amount of data accumulation, analysis and correction of the high-performance computer, the optimal rotation angle of the cover plate under different conditions can be obtained, providing a reference for similar projects, and ensuring the air pressure balance of the diversion project in multiple dimensions and maintaining the safe operation of the project.

[0076] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A culvert ventilation protection device for long-term monitoring operation, characterized in that, Comprising: An upstream ventilation and access manhole (7a), which is arranged behind the upstream working gate (6) and communicates with the top of the culvert (2) to form a front-end pressure regulation loop; a downstream ventilation and access manhole (7b), which is arranged in front of the downstream maintenance gate (5b) and communicates with the top of the culvert (2) to form a rear-end pressure regulation loop; Intelligent cover assemblies (9) are provided at the tops of both the upstream ventilation and access manhole (7a) and the downstream ventilation and access manhole (7b); the intelligent cover assembly (9) includes a circular frame (96), four sub-covers arranged within the circular frame, a power device for driving the sub-covers to rotate, sensors for collecting water level and pressure parameters inside the culvert, and a control unit for signal connection with the power device and the sensors; Among adjacent sub-covers, one of the sub-covers is of a hollow structure and can accommodate another sub-cover; after receiving a control signal, at least a part of at least one sub-cover rotates and is accommodated within the adjacent sub-cover.

2. A culvert ventilation protection device for long-term monitoring operation according to claim 1, characterized in that: The upstream ventilation and access manhole (7a) and the downstream ventilation and access manhole (7b) are vertically connected to the top of the culvert (2); Annular reinforcing ribs and sealing structures are provided at the joints of the upstream ventilation and access manhole, the downstream ventilation and access manhole and the culvert.

3. The culvert ventilation protection device for long-term monitoring operation according to claim 1, characterized in that, The four sub-covers include: A first cover (91), a second cover (92), a third cover (93) and a fourth cover (94) arranged in sequence in the clockwise direction; Among them, the second cover (92) and the fourth cover (94) are of hollow structures and are respectively used to accommodate the first cover (91) and the third cover (93).

4. A culvert ventilation protection device for long-term monitoring operation according to claim 3, characterized in that: The second cover (92) and the fourth cover (94) are fixedly connected to the circular frame (96); The first cover (91) and the third cover (93) are respectively connected to a rotating shaft (95), and the rotating shaft (95) is hydraulically driven.

5. A culvert ventilation protection device for long-term monitoring operation according to claim 4, characterized in that: The rotation range of the rotating shaft (95) is 0° to 90°; the rotation adjustment accuracy of the rotating shaft (95) is 0.5°.

6. A culvert ventilation protection device for long-term monitoring operation according to claim 3, characterized in that: The depth of the hollow cavities of the second cover (92) and the fourth cover (94) is greater than the thickness of the first cover (91) and the third cover (93); The planar size of the hollow cavities is greater than the planar size of the first cover (91) and the third cover (93); The outer edge of the circular frame (96) is coaxially arranged with the top openings of the upstream ventilation and access manhole (7a) and the upstream and downstream ventilation and access manholes (7b); The four sub-covers are evenly distributed within the circular frame (96), each occupying one-fourth of the area within the circular frame.

7. A culvert ventilation protection device for long-term monitoring operation according to claim 4, characterized in that: A main rotating shaft (97) fixedly connected to the ground is provided on the outer side of the circular frame (96) to realize the overall flipping of the cover plate.

8. A culvert ventilation protection device for long-term monitoring operation, characterized in that, The sensor includes: A pulsating pressure sensor (3) and a noise sensor (4) provided on the side wall of the culvert (2); A pulsating pressure sensor (3), a noise sensor (4) and a wind speed sensor (8) provided on the side walls of the upstream ventilation and access hole (7a) and the downstream ventilation and access hole (7b); The control unit is signal-connected to the pulsating pressure sensor (3), the noise sensor (4), the wind speed sensor (8) and the intelligent cover plate assembly.

9. The culvert ventilation protection device for long-term monitoring operation according to claim 3, characterized in that: Pulsating pressure sensors (3) are provided at the central positions of the first cover plate (91), the second cover plate (92), the third cover plate (93) and the fourth cover plate (94); A color-changing light strip and an alarm are provided on the periphery of the circular frame (96); the alarm includes a sound alarm unit and an optical alarm unit.

10. The culvert ventilation protection device for long-term monitoring operation according to claim 1, characterized in that: The upstream ventilation and access hole (7a) and the downstream ventilation and access hole (7b) are of a circular tube structure; A ladder is provided on the inner wall of the circular tube.

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