A fire extinguishing device and safety monitoring and early warning system for stay cables

Abstract

The present invention belongs to the technical field of bridge cable protection, and specifically relates to a fire extinguishing device and a safety monitoring and early warning system for inclined cables. The present invention uses firefighting gas to extinguish fires in light strips, thus avoiding secondary disasters caused by the electrified light strips. The firefighting gas extinguishes fires quickly and does not produce toxic substances, thereby improving firefighting efficiency while taking safety into account. The crushing device can crush the light strips on the cable and discharge them through the waste port, quickly stripping off the fire source on the inclined cable. The fireproof cloth and its ancillary facilities can be combined with the cooling sleeve and the stirring sleeve to form a temporary enclosed space around the inclined cable, so that the firefighting gas sprayed by the cooling sleeve can quickly reach the fire extinguishing concentration, and part of the overflowed firefighting gas can be discharged from the crushing device through the firefighting gas release window to achieve the effect of cooling the crushing device and the crushed light strips, thereby improving the utilization efficiency of the firefighting gas and having good economic efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge cable protection, and in particular relates to a fire extinguishing device and a safety monitoring and early warning system for stay cables. Background Art

[0002] Cable-stayed bridges are often chosen for their elegant appearance and long spans. However, as the primary load-bearing components of cable-stayed bridges, the cables rapidly lose strength under fire. Studies have shown that cables lose most of their strength at temperatures of 600°C, causing component failure. This alters the load-bearing state of the entire bridge, leading to catastrophic consequences. Therefore, the fire resistance of cable-stayed bridges has long been a key issue in the bridge industry. A cable-stayed bridge fire occurred when a short-circuited light strip on the cable caused the cable to catch fire, deform, and fracture. This scenario differs from traditional research on bridge deck fires, which affect the cables. First, the light strips are directly attached to the cable surface, so the fire source is unaffected by wind. Second, the fire caused by the light strips is an electrical fire, which limits firefighting methods.

[0003] Existing technologies often involve designing protective coatings for the cables themselves to enhance their fire resistance, or employing liquid and foam fire extinguishing agents to achieve fire prevention and extinguishing purposes. When a cable-stayed light strip catches fire, the flames adhere to the cable surface and continue burning, significantly damaging its load-bearing capacity. Furthermore, the light strips themselves are electrically charged, and using liquid fire extinguishing agents can cause secondary hazards due to the charge. Furthermore, the high density of liquids limits storage space on bridges, limiting the amount of fire extinguishing agents available, limiting fire extinguishing efficiency. The small diameter of the cables themselves results in a low adhesion rate for firefighting foam, significantly reducing firefighting efficiency.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a fire extinguishing device and a safety monitoring and early warning system for a stay cable. The specific scheme is as follows:

[0006] In one aspect, the present invention provides a fire extinguishing device for a stay cable, comprising:

[0007] Fireproof cloth, which is placed outside the inclined cable to cover the fire point and maintain a certain concentration of firefighting gas during fire extinguishing;

[0008] A stirring sleeve is sleeved on the inclined cable, one end of which is provided with a fireproof cloth placement chamber for accommodating the fireproof cloth and is fixedly connected to the fireproof cloth, and the other end is provided with a crushing device for crushing the light strip on the inclined cable; a stirring sleeve battery compartment is also provided between the fireproof cloth placement chamber and the crushing device;

[0009] The cooling sleeve is sleeved on the inclined cable, and a connecting column is welded at one end thereof. The bridge tower is welded with a mounting base block. The connecting column and the mounting base block are connected through an electrically controlled separation device. An electrical plug is stored in the connecting column to charge the battery compartment of the cooling sleeve, and the other end is fixedly connected to the fireproof cloth. The cooling sleeve is a two-half symmetrical structure. On the side away from the inclined cable, the cooling sleeve shell is welded with cooling sleeve connecting pieces at the upper and lower ends to merge the cooling sleeve into a whole. The inner circumference of the cooling sleeve shell is uniform. There are multiple built-in fire-fighting gas tanks, and a gas tank bracket is installed near the built-in fire-fighting gas tank to be fixed on the inner wall of the cooling sleeve shell. The built-in fire-fighting gas tanks are distributed around the circumference of the inclined cable. Each of the built-in fire-fighting gas tanks is equipped with a nitrogen gas tank, and each of the nitrogen gas tanks is fixed in the cooling sleeve shell. The built-in fire-fighting gas tanks and the nitrogen gas tanks are connected to the nozzle through a safety valve. The safety valve is a three-way valve. The nitrogen gas tank is connected to the safety valve through a nitrogen charging pipe. The safety valve is connected to the nozzle through an injection pipe. The nitrogen charging pipe An electromagnetic starter, a bottle head control valve, and a low-pressure safety valve are installed on the road. The safety valve is a master safety valve used to control whether the nozzles spray gas. The nozzles are evenly distributed around the circumference of the inclined cable and are opened and closed by the safety valve. A cooling sleeve battery compartment is also fixed to the end of the cooling sleeve near the bridge tower, which is used to power the safety valve. The cooling sleeve battery compartment is connected to the cooling sleeve shell by inserting a battery compartment connection key into the battery compartment connection hole and then inserting it into the control electrical box. The battery compartment connection key and the electrical control electrical box are connected to the necessary electrical connectors, where the electrical appliances can be selected according to the functions described in the manual. The opening and closing of the safety valve and the disconnection of the electrically controlled disconnect device are controlled by the control electrical box. The control electrical box is installed in the cooling sleeve shell, on the side near the cooling sleeve battery compartment. The cooling sleeve battery compartment is distributed with a battery status detection sensor for monitoring battery capacity, a temperature sensor, and a speed sensor. The cooling sleeve shell is equipped with a temperature sensor, a speed sensor, and a gas concentration sensor on one side of the inclined cable, with a temperature sensor installed at each nozzle position.

[0010] Specifically, the fireproof cloth and its ancillary facilities mainly include fireproof cloth and zipper heads. The fireproof cloth forms a tubular structure by a zipper arranged in its axial direction. The zipper is provided with a first zipper head at one end close to the stirring sleeve and a second zipper head at one end close to the cooling sleeve. The first zipper head and the second zipper head are connected by a zipper head connecting rod. The rotation of the zipper head connecting rod drives the second zipper head to make reciprocating motion on the zipper head connecting rod. One end of the zipper head connecting rod is fixed to the first zipper head and then passes through the first zipper head and is fixedly connected to the rotating shaft of the zipper motor. The first zipper head is fixedly connected to the zipper motor; the fireproof cloth between the first zipper head and the second zipper head After folding, it is arranged in the fireproof cloth placement chamber of the stirring sleeve; the zipper motor is fixed in the electric telescopic rod installation slot on the stirring sleeve battery compartment in the stirring sleeve, and the zipper motor is connected to the battery in the stirring sleeve battery compartment; the fireproof cloth is stored in the stirring sleeve in a folded manner. When there is a speed difference between the cooling sleeve and the stirring sleeve, the fireproof cloth is pulled out from the fireproof cloth placement chamber, and the zipper head remains relatively stationary with the stirring sleeve, so that the fireproof cloth will be closed. After the fireproof cloth is completely pulled out, the zipper head connecting rod will be shortened by the drive of the zipper motor, closing the two zipper heads. At this point, the fireproof cloth is closed, and the fireproof cloth and the two sleeves form an enclosed space.

[0011] Specifically, a fireproof cloth slide is provided at one end of the stirring sleeve near the fireproof cloth and extending into the stirring sleeve at a certain distance. One end of the fireproof cloth slide is fixedly connected to a flange provided in the inner sleeve of the stirring sleeve. A fireproof cloth placement chamber for accommodating the fireproof cloth is formed between the fireproof cloth slide and the inner sleeve. A fireproof cloth pressing plate for fixing the fireproof cloth is also provided on the circumference of the fireproof cloth slide near the flange. A gap is provided between the fireproof cloth slide and the fireproof cloth pressing plate, and the gap width is . times the thickness of the fireproof cloth. One end of the fireproof cloth is inserted into the gap between the fireproof cloth slide and the fireproof cloth pressing plate and fixed with rivets. The other end is pressed between the fireproof cloth gasket and the fireproof cloth mounting groove and fixed with rivets. The portion of the fireproof cloth fixed at the cooling sleeve end does not need to be installed with a zipper track.

[0012] Furthermore, the fireproof cloth slide is away from the outer circumference of one end of the flange, and is also provided with a plurality of leveling wheels for leveling the fireproof cloth when the fireproof cloth is drawn out. The position where the leveling wheel contacts the fireproof cloth is two rollers, and the leveling wheel is fixed to the inner circumference of the inner sleeve by a compression spring; the leveling wheel can press the fireproof cloth onto the fireproof cloth slide so that it does not produce wrinkles, thereby allowing the zipper head to move smoothly on the zipper track. A speed sensor is installed inside the leveling wheel, and the value detected by the sensor is used as the pulling-out speed of the fireproof cloth.

[0013] Furthermore, the inner circumference of the fireproof cloth slide near one end of the flange is also provided with a plurality of traveling wheels for controlling the downward acceleration or deceleration of the stirring sleeve on the inclined cable. The traveling wheel includes a hub motor and a tire mounted on the outside of the hub motor. The hub motor is also connected to a traveling wheel spring through a bracket so that the traveling wheel is always in contact with the inclined cable. The traveling wheel spring is fixed on the inner circumference of the fireproof cloth slide. The hub motor is connected to the battery in the battery compartment of the stirring sleeve and is controlled by the control electrical box.

[0014] Specifically, a gas sleeve with a conical structure is also provided between the battery compartment of the stirring sleeve and the crushing device, the large end of the gas sleeve is fixedly provided on the inner wall of the stirring sleeve shell, and the small end is fixedly connected to the internal stirring gear of the crushing device, the small end of the gas sleeve is fixed between the inner teeth and the outer teeth of the internal stirring gear, and the inner teeth of the internal stirring gear are used to pass the inclined cable and remove the light strip on the inclined cable; a fire gas release window is also provided on the circumference of the large end of the gas sleeve, and a steel fence with a high density is installed on the fire gas release window to prevent the light strip from falling into the other side of the gas sleeve. The remaining cooling gas after the fire is extinguished can be released to the crushing device through the fire gas release window, which can cool the crushing device and the light strip entering the device after crushing. A temperature sensor is installed in the gas sleeve; an outer stirring gear is provided on the circumference of the inner stirring gear, and the outer teeth of the inner stirring gear and the inner teeth of the outer stirring gear are spirally arranged in opposite directions; the outer stirring gear is provided on the circumference of the inner stirring gear Between the front protective plate and the rear protective plate, circular slide rails are provided on both sides of the outer stirring gear and between the inner teeth and the outer teeth, and the front protective plate and the rear protective plate are provided with outer stirring gear rotation tracks that are compatible with the circular slide rails, and a plurality of circular rollers are provided in the circumference of the outer stirring gear rotation track to facilitate the rotation of the outer stirring gear, and the front protective plate and the rear protective plate are both fixed in the stirring sleeve shell; a plurality of secondary gears for driving the rotation of the outer stirring gear are also provided in the circumference of the outer stirring gear, each of the secondary gears is rotationally fixed through the front protective plate and the rear protective plate, and a plurality of first-stage gears for driving the rotation of each of the second-stage gears are provided in the circumference, and the torsion bar of each first-stage gear is fixedly connected to the rotating shaft of the torque motor through a coupling, and the torque motor is fixedly provided on the outer wall of the stirring sleeve shell and is connected to the battery in the stirring sleeve battery compartment; a hole is opened at the bottom of the stirring sleeve shell to form a waste outlet for discharging the broken light strip.

[0015] Furthermore, the torque motor is arranged on the circumference of the stirring sleeve battery compartment, and a torsion bar protection groove for fixing the torsion bar is also fixed on the outer wall of the stirring sleeve shell.

[0016] Specifically, the built-in fire-fighting gas tank and the nitrogen gas tank are fixedly arranged between the outer shell of the cooling sleeve and the inner shell of the cooling sleeve. Since the built-in fire-fighting gas tank is used to temporarily store a small amount of fire-fighting gas, each of the built-in fire-fighting gas tanks is equipped with an external fire-fighting gas tank, and the external fire-fighting gas tank is arranged in a fire-fighting gas storage box. The fire-fighting gas storage box is fixed on the outer shell of the cooling sleeve. The built-in fire-fighting gas tank is connected to the external fire-fighting gas tank through an inflation pipe, and the inflation pipe is also provided with a fire-fighting gas control valve and a one-way gas valve, so that the fire-fighting gas can only flow from the external fire-fighting gas tank to the built-in fire-fighting gas tank; the built-in fire-fighting gas tank is divided into two parts by the built-in gas tank partition, wherein the part of the gas tank directly connected to the external fire-fighting gas tank can store a small amount of fire-fighting gas, and is connected to the built-in fire-fighting gas tank through the jet pipe. The nozzles are connected to ensure that in an emergency, the time of charging the air pipe to the built-in fire-fighting gas tank can be saved and the fire-fighting gas can be quickly sprayed out. The part of the gas tank away from the external fire-fighting gas tank is not connected to any pipe, and the jet pipe is connected to the nozzle after passing through this part of the gas tank, so that the fire-fighting gas can be temporarily stored when the structure leaks. The external fire-fighting gas tank is fixed on the outer wall of the cooling sleeve outer shell, and a plurality of deceleration clamps are evenly fixed on the circumference of the cooling sleeve inner shell. The deceleration clamps are used to control the sliding speed of the cooling sleeve when it slides down along the inclined cable. Each of the deceleration clamps is composed of a push rod and a deceleration plate. The fixed end of the push rod is fixed on the cooling sleeve inner shell, and the deceleration plate is fixedly connected to the movable end of the push rod. The push rod is connected to the battery in the battery compartment of the cooling sleeve and is controlled by the control electrical box.

[0017] Specifically, the stirring sleeve and the cooling sleeve are both symmetrical structures of two halves.

[0018] Preferably, the fire-fighting gas should be selected with consideration of both economy and safety, and should meet the conditions of being chemically non-reactive, environmentally friendly, non-toxic and non-corrosive, and having good electrical insulation properties.

[0019] Preferably, the outer shell of the mixing sleeve should be covered with a solar panel to prevent the battery from running out of power. The condition of the batteries in the battery compartment of the device should be checked regularly and a sensor should be placed inside the battery compartment to detect the health of the batteries and ensure that the batteries are working properly.

[0020] Preferably, rubber strips or other materials should be pre-stuffed into any gaps in the device housing to improve the structure's waterproofing. The device should be lightning-proofed to reduce the impact of extreme weather on the device.

[0021] Preferably, the volume of the external fire gas tank in the fire gas storage box should be designed comprehensively with the volume of the gap between the fireproof cloth and the inclined cable, and the moving speed of the device to ensure that the fire can be extinguished or effectively contained before the fire alarm arrives at the scene. The design process is described in detail in the embodiment.

[0022] Preferably, a pressure gauge should be placed in the external fire-fighting gas tank and the part of the internal fire-fighting gas tank away from the external fire-fighting gas tank. When a large change in the internal air pressure is detected, the device should be checked for leaks.

[0023] Preferably, a rubber gasket should be attached to the position where the speed reduction clamp contacts the inclined cable to prevent the speed reduction clamp from damaging the outer coating of the inclined cable.

[0024] Preferably, the batteries used in the present invention should be sufficiently safe, using high-energy-density batteries while meeting national standards for battery reliability. Batteries should be regularly inspected for aging to prevent accidents caused by battery quality issues.

[0025] Preferably, the steel plates of the cooling sleeve shell and each layer of the stirring sleeve of the present invention should be hollow steel plates, the electrical circuit is inserted into the cavity, and the circuit is surrounded by the outer shell iron plate, which has electromagnetic shielding effect, effectively avoiding the interference of other electromagnetic waves on the circuit and improving the stability of the device.

[0026] Preferably, the various pipes in the device are integrally formed pipes to reduce the risk of air leakage.

[0027] Preferably, the pipes of each nozzle are decoupled from each other, each safety valve only controls the nozzle where it is located, and each nozzle works independently. The amount and position of fire-fighting gas ejected can be controlled according to the fire situation, thereby reducing the waste of fire-fighting gas and improving its utilization rate.

[0028] Preferably, the protective cloth should be of a type that has strong fire resistance and good bending resistance.

[0029] Preferably, the connecting pieces of the cooling sleeve and the stirring sleeve are connected by rivets, and the stirring sleeve connecting box is connected by a long screw inserted into the connecting box mounting hole. The long screw may come into contact with the high-temperature light strip during the device's operation, so it is necessary to have a certain degree of high-temperature performance. The joints between the cooling sleeve and stirring sleeve shells should be filled with rubber strips to ensure airtightness. After each fire, all rubber products in the device should be replaced after the device is activated.

[0030] Preferably, the outside of the gas sleeve should be covered with a layer of fire-resistant paint to prevent the high-temperature light strip from damaging the structure of the gas sleeve.

[0031] Preferably, to ensure that the light strip can be rolled into the crushing device, the difference between the diameter of the smallest cylinder of the gas sleeve and the diameter of the inclined cable should not be greater than 1 / 2 of the thickness of the thinnest light strip.

[0032] Preferably, the rotation speed of the outer stirring gear is controlled at 20 rpm-30 rpm, and 1.6 times the power required by the first-stage gear calculated according to the gear ratio of each stage of gear is used as the peak power of the selected torque motor.

[0033] Preferably, the total length of the fireproof cloth should be 1 / 30 of the length of the protected rope, but not less than 2m.

[0034] Preferably, the selection of nozzle injection rate should comply with the provisions of the latest standard of "Gas Fire Extinguishing System Design Code". After selecting the charging level and fire fighting gas, the appropriate value should be selected according to the time required to reach the gas fire extinguishing concentration.

[0035] Preferably, temperature sensors should be arranged at fixed intervals on the inclined cable, and the temperature sensors at each position should be evenly placed along the circumference of the inclined cable. The positions of the temperature sensors should be recorded and recorded to the decision computer so that the device can autonomously identify the current position coordinates during the falling process without relying on external identification.

[0036] Preferably, control buttons should be provided at the bottom of the tower and in the remote control room, which can manually open the buckle between the connecting column and the cooling sleeve to release the device. This manual release device should be independent of the safety monitoring and early warning system.

[0037] Preferably, at least one backup sensor should be installed at the same location to provide redundancy for disaster prevention.

[0038] On the other hand, the present invention provides a safety monitoring and early warning system for a stay cable, specifically as follows:

[0039] The safety monitoring and early warning system consists of various sensors and decision-making computers inside and outside the fire extinguishing device. The decision-making computer inside the fire extinguishing device is integrated into the control electrical box and the mixing sleeve battery compartment. The decision-making computer outside the device is connected to the remote control room of the bridge itself to share the obtained data; the safety monitoring and early warning system is connected to the big data platform, and current sensors are arranged near the top of the tower and the top of the beam of the cable-stayed light strip. A six-parameter meteorological sensor is arranged on the top of the cable-stayed bridge tower. The safety monitoring and early warning system is connected to various cameras on the bridge and the meteorological center to obtain real-time vehicle driving trajectories, light strip images and local meteorological conditions on the bridge, and conduct big data analysis on the fire risk of the light strip, and use the extreme gradient boosting method for machine learning; each cable is equipped with multiple temperature sensors, each of which is connected to the safety monitoring and early warning system. The background monitoring data of the fire extinguishing device is directly stored in the control electrical box. The background monitoring data of the fire extinguishing device includes data from the temperature sensor, speed sensor and gas concentration sensor installed in the fire extinguishing device. When the connecting column of the fire extinguishing device is detached from the bridge tower, wireless signals are used to transmit real-time monitoring data to the safety monitoring and early warning system.

[0040] The safety monitoring and early warning system uses the light strip current, weather conditions, vehicle driving conditions, light strip images, and cable temperature as input features into the extreme gradient boosting model. The derived color labels represent the light strip's fire risk, categorizing fire risk as: green warning (indicators within a safe range), yellow warning (indicators slightly exceeding limits with minimal deterioration), and red warning (indicators severely exceeding limits with continued deterioration). The green risk value for each feature is 0, the yellow label is 0.5, and the red label is 1.

[0041] A small signal light should be installed on the fire extinguishing and disaster reduction device. The color of the signal light should be the same as the fire risk color calculated by the safety monitoring and early warning system, which will help staff to locate the inclined cables with disaster risks. A projection device should be installed at the bottom of the cable tower to be able to project indicator signs on the ground.

[0042] Specifically, the features input to the neural network are classified as follows:

[0043] Lamp current: Under normal circumstances, the lamp current should meet the following requirements:

[0044] I JS ≤KI X (1)

[0045] Among them: I JS —Calculate current;

[0046] K—correction coefficient, related to the temperature of the light strip;

[0047] I X —Safety current of the light strip, that is, the safe current carrying capacity of the light strip;

[0048] Take the cable temperature as the real-time temperature T of the light strip s When the current obtained by monitoring is less than the calculated current, T s For discussion, it is considered that the label corresponding to this feature is green; when the monitored current is greater than the calculated current, T s Carry out real-time monitoring. If T s The rising rate is low, and it rises to within 100℃ within 1 minute. At this time, the corresponding label is yellow. If T s The temperature rises at a fast rate and can quickly reach over 100°C within 1 minute. At this time, it is considered that the lamp has a high probability of fire hazard and the corresponding label is red.

[0049] Meteorological conditions: Humidity, temperature, and weather are used as features: The combination of humidity and temperature will affect the fire risk of electrical appliances. Low temperature and low humidity (25°C and 40-50% humidity) are marked as green labels, medium temperature and medium humidity (30°C and 50%-80% humidity) are marked as yellow labels, and high temperature and high humidity (≥35°C and ≥80% humidity) are marked as red labels; normal weather such as sunny and cloudy days are marked as green labels, severe weather such as thunderstorms are marked as yellow labels, and extreme weather such as typhoons and earthquakes are marked as red labels.

[0050] Vehicle driving conditions: Normal vehicle driving (no speeding or other violations on the bridge, no heavy-loaded vehicles or other hazardous chemical vehicles) is marked with a green label; abnormal vehicle driving (vehicles on the bridge are speeding or other violations, but the vehicles performing dangerous behaviors are small-sized vehicles, and heavy-loaded vehicles are far away from the inclined cables) is marked with a yellow label; bad vehicle driving conditions (vehicles on the bridge are speeding and heavy-loaded vehicles are also performing dangerous behaviors or there are serious traffic accidents on the bridge) is marked with a red label.

[0051] Light strip image: If the camera on the bridge detects that the light strip is emitting stable light and is properly installed on the cable, it will be marked with a green label. If the camera on the bridge detects that the light strip is emitting unstable light, the structure is damaged, or the installation is damaged by external forces, it will be marked with a red label.

[0052] Considering that machine learning takes a long time from feature input to prediction output, and the time interval from collecting abnormal data to the occurrence of danger in light strip fires is far less than the time taken by machine learning, it is unrealistic to use machine learning methods to directly predict light strip dangers. Therefore, this system only uses machine learning methods to calculate the importance coefficients of various parameters, and then determines whether the light strip has a fire risk by calculating the weighted sum of each feature and comparing it with the specified limit. Only four features that affect the risk of light strip fires are listed here. In reality, there may be multiple features, which can be added or replaced according to actual conditions. However, at least one feature must be present and there should be a weak correlation between features.

[0053] Furthermore, the bridge light strip fire accident and the above four characteristics at the time of the accident are input into the extreme gradient boosting method model for machine learning to obtain a suitable machine learning model. The method of constructing a machine learning algorithm is mature and can be obtained by relevant practitioners without additional work. It will not be discussed here. Then the SHAP value λ of each feature is extracted. i , that is, the importance coefficient of the feature, and then the formula

[0054]

[0055] As the weighted coefficient of the i-th feature; then, in the monitoring system, the fire risk of the cable-stayed light strip at time t is calculated according to the label type of each feature obtained by the sensor. The calculation formula is:

[0056]

[0057] in: —The label color value of the i-th feature at time t;

[0058] —The weight coefficient of the i-th label at time t;

[0059] From this, we can also know that the results of machine learning should be updated in a timely manner to ensure the reliability of the security monitoring and early warning system. Considering the problem of learning resource occupation of machine learning, the update time of the parameters should meet the following requirements:

[0060]

[0061] For bridges of higher importance, the parameter update interval should be shortened appropriately.

[0062] The predicted classification of fire risks is shown in the following table:

[0063] Table 1 Index grading table

[0064]

[0065] For green warning, the safety monitoring and warning system will not make any warning response; for yellow warning, the safety monitoring and warning system will send out an alarm in the duty room to notify the duty personnel to pay close attention to the situation on the bridge, and automatically cancel the alarm after the data returns to normal; for red warning, due to the continuity of data, D t When it reaches 0.6n, an alarm will be sounded. At this time, the safety monitoring and early warning system will still first notify the duty personnel in the duty room. t When it reaches 0.95n and the duty room fails to make effective measures to reduce D in time t The safety monitoring and early warning system will automatically release the fire extinguishing and disaster reduction device, and at the same time send an evacuation signal to the vehicles on the bridge. The projection equipment at the bottom of the cable tower will drop evacuation signs on the ground to instruct the vehicles on the bridge to evacuate in an orderly manner.

[0066] The safety monitoring and early warning system issues a downward command for the fire extinguishing device. When the control electrical box detects that the power system is powered by a battery and the speed sensor detects that the device starts to move, the traveling wheel will use electric assistance to make the fire extinguishing device move quickly to the temperature sensor position with the upper temperature abnormality closest to the inclined cable under the dual action of gravity and electricity. During this process, the crushing device starts to crush the light strip; during the sliding period, the nozzle starts to spray fire-fighting gas with a spray rate of 50% of the maximum spray rate. At this time, the safety monitoring and early warning system is mainly controlled by the remote control room, so that when the fire extinguishing device slides to the temperature abnormality point, the inclined cable can be extinguished or cooled in time; during this process, the crushing device starts, the inner stirring gear scoops up the light strip and rolls it into the gap between it and the outer stirring gear for crushing, and then it is discharged from the waste port after crushing. During this movement, the deceleration clamps provide appropriate deceleration to help the fireproofing sheet be pulled out of the mixing sleeve. During this process, a speed sensor in the leveling wheel measures the sheet's pullout speed twice per second, while a gas concentration sensor transmits gas concentration data once per second to the mixing sleeve's battery compartment and the decision-making computer in the control electrical box. The computer automatically adjusts the speed of the travel wheel to ensure the sheet is fully extended before reaching the abnormal temperature point. Furthermore, the nozzle spray rate is adjusted to ensure that HFC-227ea reaches and maintains a fire-extinguishing concentration before the 50% nozzle begins operating. Once the sheet is fully extended, the first and second zipper heads can be fully closed by the zipper motor. During this process, the safety valve remains open. Before reaching the temperature anomaly point, 20% of the sprinklers begin operating. At a distance of 10m from the temperature anomaly point, 50% of the sprinklers begin operating. At a distance of 5m from the temperature anomaly point, all sprinklers begin operating. During this period, the sprinkler spray position and spray volume are determined by the temperature distribution reported by the cable temperature sensor. After reaching the temperature anomaly point, the device will decelerate to a speed of 2m / s and slowly descend. At the same time, the temperature sensor inside the device reads the temperature inside the device cavity at a frequency of 5Hz. If the temperature inside the gas sleeve is high but the temperature inside the cooling sleeve has dropped significantly but has not reached the fire extinguishing temperature requirement, the device will immediately decelerate until the temperature inside the cooling sleeve reaches the fire extinguishing temperature. Once the temperature monitoring inside the fire extinguishing device returns to normal, the fire extinguishing device will accelerate to the next temperature anomaly point based on the real-time temperature data on the inclined cable transmitted back by the remote control room. The above operation will be repeated to extinguish the fire or cool down the temperature. During the movement to the next anomaly point, all sprinklers remain active, but the spray rate is reduced to 50% of the maximum spray rate until the temperature anomaly on the single inclined cable disappears.

[0067] If an error occurs when the safety monitoring and early warning system enters disaster reduction mode, the fire extinguishing device can be manually released in the remote control room or at the bottom of the tower. At this time, the main control of the safety monitoring and early warning system is handed over to the decision-making computer of the control electrical box in the fire extinguishing device, and the subsequent fire extinguishing and disaster reduction tasks are executed through the decision-making computer.

[0068] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0069] The present invention uses firefighting gas to extinguish fires in light strips, thus avoiding secondary disasters caused by the light strips being electrified. The firefighting gas extinguishes fires quickly and does not produce toxic substances, thereby improving firefighting efficiency while also taking safety into account. The crushing device can crush the light strips on the cable and discharge them through the waste outlet, quickly removing the fire source on the cable. The fireproof cloth and its ancillary facilities can be combined with the cooling sleeve and the stirring sleeve to form a temporary enclosed space around the cable, so that the firefighting gas sprayed by the cooling sleeve can quickly reach the fire extinguishing concentration, and some of the overflowing firefighting gas can be discharged from the crushing device through the firefighting gas release window to achieve the effect of cooling the crushing device and the crushed light strips, thereby improving the utilization efficiency of the firefighting gas and having good economy. The firefighting device works by accelerating from the tower top anchor end of the cable using its own weight and the traveling wheel motor, resulting in a fast travel speed and high firefighting efficiency. When there is no fire on the cable, the fireproof cloth is stacked and placed in the fireproof cloth placement room, reducing the length of the device and reducing the impact of the device on the vibration of the cable. The traveling wheels are provided to completely isolate the fire extinguishing device from the fire point, thus avoiding the influence of high temperature on the movement of the fire extinguishing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.

[0071] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0072] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0073] Figure 2 This is a schematic diagram of the assembly structure of the present invention;

[0074] Figure 3 This is a schematic diagram of the first three-dimensional structure of the cooling sleeve of the present invention;

[0075] Figure 4 This is a schematic diagram of the second three-dimensional structure of the cooling sleeve of the present invention;

[0076] Figure 5 This is a side view of the cooling sleeve of the present invention connected to the fireproof cloth;

[0077] Figure 6 for Figure 5 1A-1A sectional view;

[0078] Figure 7 This is a schematic diagram of the cooling sleeve battery compartment of the present invention;

[0079] Figure 8 for Figure 5 1B-1B sectional view;

[0080] Figure 9 for Figure 6 1C-1C sectional view;

[0081] Figure 10 for Figure 6 1D-1D cross-sectional view;

[0082] Figure 11 A side view of the cooling sleeve of the present invention connected to the fireproof cloth side with the fire gas storage box removed;

[0083] Figure 12 for Figure 11 1E-1E sectional view;

[0084] Figure 13 This is a schematic structural diagram of the fireproof cloth and its accessory devices of the present invention;

[0085] Figure 14 This is a schematic diagram of the first three-dimensional structure of the stirring sleeve of the present invention;

[0086] Figure 15 This is a second three-dimensional structural schematic diagram of the stirring sleeve of the present invention;

[0087] Figure 16 Schematic diagram of the discharge port structure of the stirring sleeve of the present invention;

[0088] Figure 17 This is a side view of the mixing sleeve of the present invention with the fireproof cloth installed on the side;

[0089] Figure 18 for Figure 17 2A-2A sectional view;

[0090] Figure 19 This is a schematic diagram of the structure of the stirring sleeve of the present invention after removing the stirring sleeve shell;

[0091] Figure 20 This is a schematic diagram of the structure of the stirring sleeve of the present invention after removing the inner sleeve;

[0092] Figure 21 This is a schematic structural diagram of the crushing device of the present invention;

[0093] Figure 22 This is a schematic diagram of the assembly of the fireproof cloth of the present invention;

[0094] Figure 23 for Figure 22AA section view;

[0095] Figure 24 Schematic diagram of the installation structure of the fire extinguishing device of the present invention;

[0096] Figure 25 This is a workflow diagram of the safety monitoring and early warning system of the present invention.

[0097] Among them: 1 is cooling sleeve; 2 is stirring sleeve; 3 is inclined cable and attached light strip; 4 is fireproof cloth gasket; 5 is fireproof cloth installation track; 6 is fireproof cloth and its attached device; 7 is mounting base block; 8 is connecting column; 100 is cooling sleeve battery compartment; 101 is cooling sleeve connecting piece; 102 is fire gas storage box; 103 is nozzle; 104 is speed reduction clamp; 105 is fireproof cloth installation slot; 106 is external fire gas tank; 107 is gas tank stiffening rib; 108 is Inflatable pipe; 109 is the built-in fire gas tank; 110 is the nitrogen gas tank; 111 is the gas tank bracket; 112 is the control electrical box; 113 is the built-in gas tank partition; 114 is the jet pipe; 115 is the safety valve; 116 is the nitrogen inflation pipe; 117 is the battery compartment mounting hole; 118 is the battery compartment connection key; 119 is the cooling sleeve housing; 200 is the stirring sleeve housing; 201 is the gear box; 202 is the stirring sleeve connection box; 203 is the stirring sleeve connection piece ; 204 is the leveling wheel; 205 is the fireproof cloth slide; 206 is the traveling wheel; 207 is the mixing sleeve battery compartment; 208 is the outer mixing gear; 209 is the inner mixing gear; 210 is the electric telescopic rod mounting notch; 211 is the fireproof cloth mounting pressure plate; 212 is the fireproof cloth placement room; 213 is the fire gas release window; 214 is the connection box mounting hole; 215 is the crushing device; 216 is the gas sleeve; 217 is the inner sleeve; 218 is the torque motor; 219 is a coupling; 220 is a first-stage gear; 221 is a second-stage gear; 222 is a front protective plate; 223 is a rear protective plate; 224 is a torsion bar protection groove; 225 is a rotating track for the outer stirring gear; 226 is a waste port; 227 is a compression spring; 300 is a diagonal cable; 301 is a light strip; 500 is a fixing plate; 501 is a fixed track; 600 is a fireproof cloth; 601 is a zipper track; 602 is a zipper head; 603 is a zipper head connecting rod; 604 is a zipper motor. DETAILED DESCRIPTION

[0098] Exemplary embodiments will now be described in detail, with examples shown in the accompanying drawings. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present invention. Instead, they are merely examples consistent with some aspects of the present invention as detailed in the appended claims.

[0099] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

[0100] Example

[0101] See also Figure 1-25 As shown, this embodiment provides a fire extinguishing device for a stay cable, comprising:

[0102] Fireproof cloth 600, which is placed outside the inclined cable 300, is used to cover the fire point and keep the fire gas at a certain concentration when extinguishing the fire; Figure 2 As shown;

[0103] The stirring sleeve 2 is sleeved on the inclined cable 300, and one end of the stirring sleeve is provided with a fireproof cloth placement chamber 212 for accommodating the fireproof cloth 600 and is fixedly connected to the fireproof cloth 600, and the other end is provided with a crushing device 215 for crushing the light strip 301 on the inclined cable 300; a stirring sleeve battery compartment 207 is also provided between the fireproof cloth placement chamber 212 and the crushing device 215; see Figure 14-16 As shown;

[0104] The cooling sleeve 1 is sleeved on the inclined cable 300, and a connecting column 8 is welded at one end thereof. The bridge tower is welded with a mounting base 7. The connecting column 8 is connected to the mounting base 7 through an electrically controlled separation device. An electrical plug is stored in the connecting column 8 to charge the cooling sleeve battery compartment 100. The other end is fixedly connected to the fireproof cloth 600. The cooling sleeve 1 is a two-half symmetrical structure. On the side away from the inclined cable, the cooling sleeve shell 119 is welded with cooling sleeve connecting pieces 101 at the upper and lower ends to merge the cooling sleeve 1 into a whole. A plurality of built-in fire-fighting gas tanks 109 are evenly fixed in the circumference of the cooling sleeve shell 119 of the cooling sleeve 1. A gas tank bracket 111 is installed near the built-in fire-fighting gas tank 109 for fixing to the inner wall of the cooling sleeve shell 119. The built-in fire-fighting gas tanks 109 are distributed around the inclined cable 300. Each of the built-in fire-fighting gas tanks 109 is equipped with a nitrogen gas tank 110. Each of the nitrogen gas tanks 110 is fixed in the cooling sleeve shell 119. The built-in fire-fighting gas tanks 109 and the nitrogen gas tanks 110 are connected to the nozzle 103 through a safety valve 115. The safety valve 115 is a three-way valve. The nitrogen gas tank 110 is connected to the safety valve 115 through a nitrogen charging pipe 116. The safety valve 115 is connected to the nozzle 103 through an injection pipe 114. An electromagnetic starter, a bottle head control valve and a low-pressure safety valve are installed on the nitrogen charging pipe 116. The safety valve 115 is a main safety valve used to control whether the nozzle 103 sprays gas. The nozzles 103 are evenly distributed around the circumference of the inclined cable 300. The nozzles 103 are opened and closed by the safety valve 115. A cooling sleeve battery compartment 100 for supplying power to the safety valve 115 is also fixed to the end of the cooling sleeve 1 close to the bridge tower. The cooling sleeve battery compartment 100 and the cooling sleeve housing 119 are connected to the control electrical box 112 by inserting the battery compartment connecting key 118 into the battery compartment connecting hole 117. The battery compartment connecting key 118 and the electrical control electrical box 11 2 is connected to the necessary electrical connectors, where the electrical appliances can be selected according to the functions described in the manual. The opening and closing of the safety valve 115 and the disconnection of the electrically controlled separation device are controlled by the control electrical box 112; the control electrical box 112 is installed in the cooling sleeve housing 119 and is close to the side of the cooling sleeve battery compartment 100; the cooling sleeve battery compartment 100 is distributed with a battery status detection sensor for monitoring battery capacity, a temperature sensor, and a speed sensor; the cooling sleeve housing 119 is provided with a temperature sensor, a speed sensor, and a gas concentration sensor on one side of the inclined cable 300, and a temperature sensor is installed at the position of each nozzle 103; see Figure 3-12 shown.

[0105] Specifically, the fireproof cloth and its ancillary facilities 6 mainly include a fireproof cloth 600 and a zipper head 603. The fireproof cloth 600 forms a tubular structure by a zipper arranged in its axial direction. The zipper is provided with a first zipper head 603A at one end close to the stirring sleeve 2 and a second zipper head 603B at one end close to the cooling sleeve 1. The first zipper head 603A and the second zipper head 603B are connected by a zipper head connecting rod 603. The rotation of the zipper head connecting rod 603 drives the second zipper head 603B to do reciprocating motion on the zipper head connecting rod 603. One end of the zipper head connecting rod 603 is rotated and fixed with the first zipper head 603A, and then passes through the first zipper head 603A and is fixedly connected to the rotating shaft of the zipper motor 604. The first zipper head 603A is fixedly connected to the zipper motor 604; the first zipper head 603A and the second zipper head 603B are connected. After being folded, the fireproof cloth 600 is arranged in the fireproof cloth placement chamber 212 of the stirring sleeve 2; the zipper motor 604 is fixed in the electric telescopic rod installation slot 210 on the stirring sleeve battery compartment 207 in the stirring sleeve 2, and the zipper motor 604 is connected to the battery in the stirring sleeve battery compartment 207; the fireproof cloth 300 is stored in the stirring sleeve 2 in a folded manner. When there is a speed difference between the cooling sleeve 1 and the stirring sleeve 2, the fireproof cloth 600 is pulled out from the fireproof cloth placement chamber 212, and the zipper head 602 remains relatively stationary with the stirring sleeve 2, so that the fireproof cloth 600 will be closed. After the fireproof cloth 600 is completely pulled out, the zipper head connecting rod 603 will be shortened under the drive of the zipper motor 604, closing the two zipper heads 602. At this point, all the fireproof cloths 600 are closed, and the fireproof cloth 600 and the two sleeves form a closed space; see Figure 2 、 13 shown.

[0106] Specifically, a fireproof cloth slide 205 is provided at one end of the stirring sleeve 2 near the fireproof cloth 600 and extending into the stirring sleeve 2 at a certain distance. One end of the fireproof cloth slide 205 is fixedly connected to a flange provided in the inner sleeve 217 of the stirring sleeve 2. A fireproof cloth placement chamber 212 for accommodating the fireproof cloth 600 is formed between the fireproof cloth slide 205 and the inner sleeve 217. A fireproof cloth pressing plate 211 for fixing the fireproof cloth 600 is also provided on the circumference of the fireproof cloth slide 205 near the flange. There is a gap between the fireproof cloth slide 205 and the fireproof cloth pressing plate 211, and the width of the gap is 1.2 times the thickness of the fireproof cloth 600. One end of the fireproof cloth 600 is inserted into the gap between the fireproof cloth slide 205 and the fireproof cloth pressing piece 211 and fixed with a rivet. The other end is pressed between the fireproof cloth gasket 4 and the fireproof cloth installation groove 105 and fixed with a rivet. The part of the fireproof cloth 600 fixed at the end of the cooling sleeve 1 does not need to be installed with a zipper track 601; see Figure 2 shown.

[0107] Furthermore, the fireproof cloth slideway 205 is away from the outer circumference of one end of the flange, and is further provided with a plurality of leveling wheels 204 for leveling the fireproof cloth 600 when the fireproof cloth 600 is drawn out. The position where the leveling wheel 204 contacts the fireproof cloth 600 is two rollers, and the leveling wheel 204 is fixed to the inner circumference of the inner sleeve 217 by a compression spring 227; the leveling wheel 204 can press the fireproof cloth 600 onto the fireproof cloth slideway 205 without causing wrinkles, thereby allowing the zipper head 602 to move smoothly on the zipper track 601. A speed sensor is installed inside the leveling wheel 204, and the value detected by the sensor is used as the pulling-out speed of the fireproof cloth; see Figure 17 、 18 , as shown in 20.

[0108] Furthermore, the inner circumference of the fireproof cloth slide 205 near one end of the flange is also provided with a plurality of traveling wheels 206 for controlling the downward acceleration or deceleration of the stirring sleeve 2 on the inclined cable 300. The traveling wheel 206 includes a hub motor and a tire mounted on the outside of the hub motor. The hub motor is also connected to a traveling wheel spring through a bracket so that the traveling wheel is always in contact with the inclined cable. The traveling wheel spring is fixed on the inner circumference of the fireproof cloth slide 205. The hub motor is connected to the battery in the stirring sleeve battery compartment 207 and is controlled by the control electrical box 112.

[0109] Specifically, a conical gas sleeve 216 is provided between the mixing sleeve battery compartment 207 and the crushing device 215. The large end of the gas sleeve 216 is fixedly provided on the inner wall of the mixing sleeve housing 200, and the small end is fixedly connected to the internal mixing gear 209 of the crushing device 215. The small end of the gas sleeve 216 is fixed between the inner teeth and the outer teeth of the internal mixing gear 209. The inner teeth of the internal mixing gear 209 are used to pass the inclined cable 300 and remove the light strip 301 on the inclined cable 300. The large end of the gas sleeve 216 is also provided with a fire gas release device on its circumference. Window 213, the fire gas release window 213 is installed with a high-density steel fence to prevent the light strip from falling into the other side of the gas sleeve 216. The remaining cooling gas after the fire is extinguished can be released to the crushing device 215 through the fire gas release window 213, which can cool the crushing device 215 and the light strip entering the device after crushing. A temperature sensor is installed in the gas sleeve 216; an outer stirring gear 208 is arranged on the circumference of the inner stirring gear 209, and the outer teeth of the inner stirring gear 209 and the inner teeth of the outer stirring gear 208 are arranged in a reverse spiral; the outer stirring gear 208 is arranged in the front Between the protective plate 222 and the rear protective plate 223, circular slide rails are provided on both sides of the outer stirring gear 208 and between the inner teeth and the outer teeth. The front protective plate 222 and the rear protective plate 223 are both provided with an outer stirring gear rotating track 225 adapted to the circular slide rails. The outer stirring gear rotating track 225 is provided with a plurality of circular rollers facilitating the rotation of the outer stirring gear 208. The front protective plate 222 and the rear protective plate 223 are both fixed in the stirring sleeve housing 200. The outer stirring gear 208 is also provided with a plurality of secondary rollers for driving its rotation. Gear 221, each of the secondary gears 221 is fixed in rotation by a front protective plate 222 and a rear protective plate 223, and each of the secondary gears 221 is provided with a plurality of primary gears 220 driving its rotation on its circumference, and the torsion bar of each primary gear 220 is fixedly connected to the rotating shaft of the torque motor 218 through a coupling 219, and the torque motor 218 is fixedly provided on the outer wall of the mixing sleeve housing 200 and is connected to the battery in the mixing sleeve battery compartment 207; a waste port 226 for discharging the broken light strip is formed at the bottom of the mixing sleeve housing 200; see Figure 19-21 shown.

[0110] Furthermore, the torque motor 218 is arranged on the circumference of the stirring sleeve battery compartment 207, and the outer wall of the stirring sleeve housing 200 is also provided with a torsion bar protection groove 224 for fixing the torsion bar; Figure 20 shown.

[0111] Specifically, the built-in fire-fighting gas tank 109 and the nitrogen gas tank 110 are fixedly arranged between the cooling sleeve outer shell 119 and the cooling sleeve inner shell. Since the built-in fire-fighting gas tank 109 is used to temporarily store a small amount of fire-fighting gas, each of the built-in fire-fighting gas tanks 109 is equipped with an external fire-fighting gas tank 106. The external fire-fighting gas tank 106 is arranged in the fire-fighting gas storage box 102, and the fire-fighting gas storage box 102 is fixed on the cooling sleeve outer shell 119. The built-in fire-fighting gas tank 109 is connected to the external fire-fighting gas tank 106 through an inflation pipe 108. The inflation pipe 108 is also provided with a fire-fighting gas control valve and a one-way gas valve, so that the fire-fighting gas can only flow from the external fire-fighting gas tank 106 to the built-in fire-fighting gas tank 109; the built-in fire-fighting gas tank 109 is divided into two parts by the built-in gas tank partition 113, wherein the part of the gas tank directly connected to the external fire-fighting gas tank 106 can store a small amount of fire-fighting gas, and through the spray The air pipe 114 is connected to the nozzle 103 to ensure that in an emergency, the time of the inflation pipe 108 to the built-in fire-fighting gas tank 109 can be saved and the fire-fighting gas can be quickly sprayed out. The part of the gas tank away from the external fire-fighting gas tank 106 is not connected to any pipe, and the jet pipe 114 is connected to the nozzle 103 after passing through this part of the gas tank, so that the fire-fighting gas can be temporarily stored when the structure leaks. The external fire-fighting gas tank 106 is fixed on the outer wall of the cooling sleeve shell 119, and a plurality of deceleration clamps 104 are evenly fixed on the circumference of the cooling sleeve inner shell. The deceleration clamps 104 are used to control the sliding speed of the cooling sleeve 1 when it slides down the inclined cable 300. Each of the deceleration clamps 104 is composed of a push rod and a deceleration plate. The fixed end of the push rod is fixed to the cooling sleeve inner shell, and the deceleration plate is fixedly connected to the movable end of the push rod. The push rod is connected to the battery in the cooling sleeve battery compartment 100 and is controlled by the control electrical box 112; see Figure 3-12 shown.

[0112] Specifically, the stirring sleeve 2 and the cooling sleeve 1 are both symmetrical structures of two halves.

[0113] This embodiment also provides a method for installing a fire extinguishing device for a stay cable, which is specifically as follows:

[0114] The fire extinguishing device should be installed before the light strip is installed on the cable stay. Before installation, the length and diameter of the fireproof cloth 600 should be estimated and the nozzle 103 should be selected. The recommended length is 1 / 30 of the protection cable length, but not less than 2m, and the diameter is 1cm larger than the protected cable stay. Heptafluoropropane is selected as the firefighting gas. Its fire extinguishing concentration is 7%, and the fire length is 1 / 2 of the cable length. The concentration is required to reach within 10 seconds. Based on this, the required volume of each firefighting gas tank can be estimated as follows:

[0115]

[0116] Wherein: L is the length of the inclined cable 300, D is the diameter of the inclined cable 300;

[0117] If the concentration is required to be reached within ten seconds, the spray rate of the nozzle is required to be:

[0118]

[0119] Where: l is the total length of the fireproof cloth 600; N is the number of nozzles; d is the diameter of the nozzle; ρ is the density of heptafluoropropane.

[0120] The fire extinguishing device should be preliminarily assembled before being installed on the stay cable 300. That is, the cooling sleeve 1, stirring sleeve 2, fireproof cloth and its accessories 6 should all be assembled. The fireproof cloth 600 should be stacked and stored in the stirring sleeve, and then assembly should begin at the bottom of the stay cable 300. First, install the stirring sleeve 2 on the stay cable 300, then insert the fireproof cloth 600 into the fireproof cloth installation track 5, and then press the part of the fireproof cloth 600 without the zipper track 601 into the fireproof cloth installation groove 105, press in the fireproof cloth gasket 4, and then install bolts to fix the fireproof cloth gasket 4. Finally, use bolts to connect the fireproof cloth installation track 5 to the fireproof cloth gasket 4. At this time, the second zipper head 602B on the fireproof cloth 600 near the cooling sleeve 1 is not connected to the zipper head connecting rod 603, but is in contact with the cooling sleeve shell 119. The second zipper head 602B needs to be manually pulled to the position between the two leveling wheels 204, and then the zipper head connecting rod 603 is rotated to the second zipper head 602B near the cooling sleeve 1. In this process, the first zipper head 602A away from the cooling sleeve 1 is fixed to the other end of the zipper track near the stirring sleeve 2 together with the zipper motor 604, and the zipper motor 604 has been installed into the electric telescopic rod installation slot 210. After the installation is completed, the entire device is lifted to the top of the inclined cable 300 using a pulley or other temporary structure, the deceleration clamp 104 and the traveling wheel 206 are locked, and connected to the buckle in the connecting column 8, the deceleration clamp 104 and the traveling wheel 206 are released, and then the light strip 301 can be installed on the inclined cable 300.

[0121] This embodiment provides a safety monitoring and early warning system for a stay cable, specifically as follows:

[0122] See also Figure 25As shown, the safety monitoring and early warning system consists of various sensors and decision-making computers inside and outside the fire extinguishing device. The decision-making computer inside the fire extinguishing device is integrated into the control electrical box 112 and the mixing sleeve battery compartment 207. The decision-making computer outside the device is connected to the remote control room of the bridge itself to share the obtained data; the safety monitoring and early warning system is connected to the big data platform, and current sensors are respectively arranged near the top of the tower and the top of the beam of the cable-stayed cable 300 light strip. A six-parameter meteorological sensor is arranged on the top of the cable-stayed bridge tower. The safety monitoring and early warning system is connected to various cameras on the bridge and the meteorological center to obtain real-time vehicle driving trajectories on the bridge, images of the light strip 301, and local meteorological conditions. It also conducts big data analysis on the fire risk of the light strip 301 and uses the extreme gradient boosting method for machine learning.

[0123] Each stay cable 300 is equipped with multiple temperature sensors, each of which is connected to the safety monitoring and early warning system. The background monitoring data of the fire extinguishing device is directly stored in the control electrical box 112. The background monitoring data of the fire extinguishing device includes data from the temperature sensor, speed sensor, and gas concentration sensor installed in the fire extinguishing device. When the connecting column 8 of the fire extinguishing device is separated from the bridge tower, the real-time monitoring data is transmitted to the safety monitoring and early warning system via wireless signals.

[0124] The safety monitoring and early warning system uses the light strip current, weather conditions, vehicle driving conditions, images of the light strip 301, and the temperature of the cable 300 as input features into the extreme gradient boosting model. The derived color labels represent the fire risk of the light strip 301, categorizing the fire risk into: green warning (indicators within a safe range), yellow warning (indicators slightly exceeding the limit with no significant deterioration), and red warning (indicators severely exceeding the limit with continued deterioration). The green risk value for each feature is 0, the yellow label is 0.5, and the red label is 1.

[0125] A small signal light shall be installed on the fire extinguishing and disaster reduction device. The color of the signal light shall be the same as the fire risk color calculated by the safety monitoring and early warning system, so that the staff can easily locate the inclined cable 300 with disaster risk. A projection device shall be installed at the bottom of the cable tower to project indicator signs on the ground.

[0126] Specifically, the features input to the neural network are classified as follows:

[0127] Lamp current: Under normal circumstances, the lamp current should meet the following requirements:

[0128] I JS ≤KI X (1)

[0129] Among them: I JS —Calculate current;

[0130] K—correction coefficient, related to the temperature of the light strip;

[0131] I X —Safety current of the light strip, that is, the safe current carrying capacity of the light strip;

[0132] Take the temperature of the cable at 300°C as the real-time temperature T of the light strip. s When the current obtained by monitoring is less than the calculated current, T s For discussion, it is considered that the label corresponding to this feature is green; when the monitored current is greater than the calculated current, T s Carry out real-time monitoring. If T s The rising rate is low, and it rises to within 100℃ within 1 minute. At this time, the corresponding label is yellow. If T s The temperature rises at a fast rate and can quickly reach over 100°C within 1 minute. At this time, it is considered that the lamp has a high probability of fire hazard and the corresponding label is red.

[0133] Meteorological conditions: Humidity, temperature, and weather are used as features: The combination of humidity and temperature will affect the fire risk of electrical appliances. Low temperature and low humidity (25°C and 40-50% humidity) are marked as green labels, medium temperature and medium humidity (30°C and 50%-80% humidity) are marked as yellow labels, and high temperature and high humidity (≥35°C and ≥80% humidity) are marked as red labels; normal weather such as sunny and cloudy days are marked as green labels, severe weather such as thunderstorms are marked as yellow labels, and extreme weather such as typhoons and earthquakes are marked as red labels.

[0134] Vehicle driving conditions: Normal vehicle driving (no speeding or other violations on the bridge, no heavy-loaded vehicles or other hazardous chemical vehicles) is marked with a green label; abnormal vehicle driving (vehicles on the bridge are speeding or other violations, but the vehicles performing dangerous behaviors are small-sized vehicles, and the heavy-loaded vehicles are far away from the 300-meter cable) is marked with a yellow label; bad vehicle driving conditions (vehicles on the bridge are speeding and heavy-loaded vehicles are also performing dangerous behaviors or there are serious traffic accidents on the bridge) is marked with a red label.

[0135] Light strip image: If the camera on the bridge detects that the light strip is emitting stable light and is properly installed on the cable-stayed cable 300, it will be marked with a green label. If the camera detects that the light strip is emitting unstable light, the structure is damaged, or the installation is damaged by external forces, it will be marked with a red label.

[0136] Considering that machine learning takes a long time from feature input to prediction output, and the time interval from collecting abnormal data to the occurrence of danger in light strip 301 during the fire incident is far shorter than the time taken by machine learning, it is unrealistic to directly predict the danger of light strip 301 using machine learning methods. Therefore, this system only uses machine learning methods to calculate the importance coefficients of various parameters, and then determines whether the light strip has a fire risk by calculating the weighted sum of each feature and comparing it with the specified limit. Only four features that affect the fire risk of light strips are listed here. In reality, there may be more features, which can be added or replaced according to actual conditions. However, there must be at least four features, and the features should have weak correlations.

[0137] Furthermore, the bridge light strip 301 fire accident and the above four characteristics at the time of the accident were input into the extreme gradient boosting method model for machine learning to obtain a suitable machine learning model. The method of constructing a machine learning algorithm is mature and can be obtained by relevant practitioners without additional work. It will not be discussed here. Then the SHAP value λ of each feature is extracted. i , that is, the importance coefficient of the feature, and then the following formula

[0138]

[0139] As the weighted coefficient of the i-th feature; then, in the monitoring system, the fire risk of the inclined cable 300 light strip at time t is calculated according to the label type of each feature obtained by the sensor. The calculation formula is:

[0140]

[0141] in: —The label color value of the i-th feature at time t;

[0142] —The weight coefficient of the i-th label at time t;

[0143] From this, we can also know that the results of machine learning should be updated in a timely manner to ensure the reliability of the security monitoring and early warning system. Considering the problem of learning resource occupation of machine learning, the update time of the parameters should meet the following requirements:

[0144]

[0145] For bridges of higher importance, the parameter update interval should be shortened appropriately.

[0146] The predicted classification of fire risks is shown in the following table:

[0147] Table 2 Index grading table

[0148]

[0149] For green warning, the safety monitoring and warning system will not make any warning response; for yellow warning, the safety monitoring and warning system will send out an alarm in the duty room to notify the duty personnel to pay close attention to the situation on the bridge, and automatically cancel the alarm after the data returns to normal; for red warning, due to the continuity of data, D t When it reaches 0.6n, an alarm will be sounded. At this time, the safety monitoring and early warning system will still first notify the duty personnel in the duty room. t When it reaches 0.95n and the duty room fails to make effective measures to reduce D in time t The safety monitoring and early warning system will automatically release the fire extinguishing and disaster reduction device, and at the same time send an evacuation signal to the vehicles on the bridge. The projection equipment at the bottom of the cable tower will drop evacuation signs on the ground to instruct the vehicles on the bridge to evacuate in an orderly manner.

[0150] The safety monitoring and early warning system issues a downward gliding instruction for the fire extinguishing device. When the control electrical box 112 detects that the power system is powered by a battery and the speed sensor detects that the device starts to move, the traveling wheel 206 will use electric assistance to make the fire extinguishing device move quickly to the temperature sensor position with the upper temperature anomaly closest to the inclined cable 300 under the dual action of gravity and electricity. During this process, the crushing device 215 starts to crush the light strip 301; during the sliding period, the nozzle 103 starts to spray fire-fighting gas with a spray rate of 50% of the maximum spray rate. At this time, the safety monitoring and early warning system is mainly controlled by the remote control room, so that the fire extinguishing device can extinguish the fire or cool the inclined cable 300 in time when it slides to the temperature anomaly point; during this process, the crushing device 215 starts, the inner stirring gear 209 scoops up the light strip and rolls it into the gap between it and the outer stirring gear 208 for crushing, and then discharges it from the waste port 226 after crushing. During this movement, the deceleration clamp 104 performs appropriate deceleration to help pull the fireproof cloth 600 out of the mixing sleeve 2. During this process, the speed sensor in the leveling wheel 204 measures the pulling speed of the fireproof cloth 600 twice per second, and the gas concentration sensor transmits the gas concentration information once per second to the mixing sleeve battery compartment 207 and the decision-making computer in the control electrical box 112. The computer automatically adjusts the speed of the travel wheel 206 to ensure that the fireproof cloth 600 can be fully pulled out before reaching the abnormal temperature point. The spray rate of the nozzle 103 is also adjusted to ensure that the HFC-227ea reaches and maintains a fire-extinguishing concentration before the 50% nozzle begins to operate. After the fireproof cloth 600 is fully pulled out, the first zipper head 602A and the second zipper head 602B can be fully closed by the zipper motor 604. During this process, the safety valve 115 is always in the open state. Before reaching the abnormal temperature point, 20% of the nozzles 103 start working; when they are 10m away from the abnormal temperature point, 50% of the nozzles 103 start working; when they are 5m away from the abnormal temperature point, all the nozzles 103 start working. During this period, the spraying position and spraying amount of the nozzles 103 depend on the temperature distribution transmitted by the temperature sensor on the cable. After reaching the abnormal temperature point, the device will slow down to 2m / s and slowly descend. At the same time, the temperature sensor in the device reads the temperature in the device cavity at a frequency of 5Hz. If the temperature shows gas If the temperature inside the sleeve 216 is high but the temperature inside the cooling sleeve 1 drops significantly but does not reach the fire extinguishing temperature requirement, the system should be decelerated immediately until the temperature inside the cooling sleeve 1 reaches the fire extinguishing temperature. After the temperature monitoring inside the fire extinguishing device returns to normal, the fire extinguishing device is accelerated to the next abnormal temperature point based on the temperature data on the inclined cable 300 transmitted back in real time from the remote control room, and the above operation is repeated to extinguish the fire or reduce the temperature. During the movement to the next abnormal temperature point, the nozzle 103 remains fully operational, but the spray rate is reduced to 50% of the maximum spray rate until the abnormal temperature point on the single inclined cable 300 disappears.

[0151] If an error occurs when the safety monitoring and early warning system enters the disaster reduction mode, the fire extinguishing device can be manually released in the remote control room or at the bottom of the tower. At this time, the main control of the safety monitoring and early warning system is handed over to the decision-making computer of the control electrical box 112 in the fire extinguishing device, and the subsequent fire extinguishing and disaster reduction tasks are executed by the decision-making computer.

[0152] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0153] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A fire extinguishing device for a stay cable, characterized in that: include: A fireproof cloth (600) is provided outside the inclined cable (300) and is used to cover the fire point and maintain a certain concentration of firefighting gas when extinguishing the fire; A stirring sleeve (2), the stirring sleeve (2) being sleeved on the inclined cable (300), one end of which is provided with a fireproof cloth placement chamber (212) for accommodating the fireproof cloth (600) and fixedly connected to the fireproof cloth (600), and the other end of which is provided with a crushing device (215) for crushing the light strip (301) on the inclined cable (300); a stirring sleeve battery compartment (207) is further provided between the fireproof cloth placement chamber (212) and the crushing device (215); A cooling sleeve (1) is provided on the inclined cable (300), one end of which is connected to the bridge tower via an electrically controlled separation device, and the other end is fixedly connected to the fireproof cloth (600); a plurality of built-in fire-fighting gas tanks (109) are evenly fixedly provided in the circumferential direction of the cooling sleeve shell (119) of the cooling sleeve (1), the built-in fire-fighting gas tanks (109) are distributed in the circumferential direction of the inclined cable (300), each of the built-in fire-fighting gas tanks (109) is equipped with a nitrogen gas tank (110), and each of the nitrogen gas tanks (110) is fixed in the cooling sleeve shell (119), the built-in fire-fighting gas tanks (109) and the nitrogen gas tanks (110) are fixed in the cooling sleeve shell (119), and the built-in fire-fighting gas tanks (109) and the nitrogen gas tanks (110) are fixed in the cooling sleeve shell (119). (110) are connected to the nozzle (103) through the safety valve (115), and the nozzles (103) are evenly distributed around the circumference of the inclined cable (300). The nozzles (103) are controlled to open and close by the safety valve (115); a cooling sleeve battery compartment (100) for supplying power to the safety valve (115) is fixed to one end of the cooling sleeve (1) close to the bridge tower, and the opening and closing of the safety valve (115) and the disconnection of the electric control separation device are controlled by the control electrical box (112); the control electrical box (112) is installed in the cooling sleeve housing (119) and close to one side of the cooling sleeve battery compartment (100).

2. The fire extinguishing device according to claim 1, characterized in that: The fireproof cloth (600) is formed into a cylindrical structure by a zipper arranged in its axial direction. The end of the zipper close to the stirring sleeve (2) is provided with a first zipper head (602A), and the end close to the cooling sleeve (1) is provided with a second zipper head (602B). The first zipper head (602A) and the second zipper head (602B) are connected by a zipper head connecting rod (603). The rotation of the zipper head connecting rod (603) drives the second zipper head (602B) to perform reciprocating motion on the zipper head connecting rod (603). One end of the zipper head connecting rod (603) is connected to the first zipper head (602). A) is rotated and fixed, passes through the first zipper head (602A) and is fixedly connected to the rotating shaft of the zipper motor (604), and the first zipper head (602A) is fixedly connected to the zipper motor (604); the fireproof cloth (600) between the first zipper head (602A) and the second zipper head (602B) is folded and arranged in the fireproof cloth placement chamber (212) of the stirring sleeve (2); the zipper motor (604) is fixed to one end of the stirring sleeve (2) close to the fireproof cloth (600), and the zipper motor (604) is connected to the battery in the stirring sleeve battery compartment (207).

3. The fire extinguishing device according to claim 1, characterized in that: A fireproof cloth slideway (205) is further provided at one end of the stirring sleeve (2) close to the fireproof cloth (600) and extending into the stirring sleeve (2) at a certain distance. One end of the fireproof cloth slideway (205) is fixedly connected to a flange provided in an inner sleeve (217) of the stirring sleeve (2). A fireproof cloth placement chamber (212) for accommodating the fireproof cloth (600) is formed between the fireproof cloth slideway (205) and the inner sleeve (217). A fireproof cloth pressing piece (211) for fixing the fireproof cloth (600) is further provided on the circumference of the fireproof cloth slideway (205) close to the flange.

4. The fire extinguishing device according to claim 3, characterized in that: The fireproof cloth slideway (205) is away from the outer circumference of one end of the flange, and is further provided with a plurality of leveling wheels (204) for leveling the fireproof cloth (600) when the fireproof cloth (600) slides out. The leveling wheels (204) are fixed to the inner circumference of the inner sleeve (217) through a compression spring (227).

5. The fire extinguishing device according to claim 3, characterized in that: The fireproof cloth slideway (205) is provided with a plurality of traveling wheels (206) on the inner circumference of one end of the flange for controlling the stirring sleeve (2) to accelerate or decelerate downward on the inclined cable (300). The traveling wheels (206) include a hub motor and a tire mounted on the outside of the hub motor. The hub motor is also connected to a traveling wheel spring through a bracket so that the traveling wheel is always in contact with the inclined cable. The traveling wheel spring is fixed on the inner circumference of the fireproof cloth slideway (205). The hub motor is connected to the battery in the stirring sleeve battery compartment (207) and is controlled by the control electrical box (112).

6. The fire extinguishing device according to claim 1, characterized in that: A conical gas sleeve (216) is further provided between the stirring sleeve battery compartment (207) and the crushing device (215). The large end of the gas sleeve (216) is fixedly provided on the inner wall of the stirring sleeve housing (200), and the small end is fixedly connected to the inner stirring gear (209) of the crushing device (215). The small end of the gas sleeve (216) is fixed between the inner teeth and the outer teeth of the inner stirring gear (209). The inner teeth of the inner stirring gear (209) are used for passing the inclined cable (300) and removing the inclined cable. (300) upper light strip (301); a fire gas release window (213) is further provided on the circumference of the large end of the gas sleeve (216); an outer stirring gear (208) is provided on the circumference of the inner stirring gear (209); the outer teeth of the inner stirring gear (209) and the inner teeth of the outer stirring gear (208) are arranged in opposite spiral directions; the outer stirring gear (208) is arranged between the front protective plate (222) and the rear protective plate (223); the outer stirring gear (208) is provided on both sides of the outer stirring gear (208) and between the inner teeth and the outer teeth. Both are provided with circular slide rails, and the front protection plate (222) and the rear protection plate (223) are provided with external stirring gear rotation tracks (225) adapted to the circular slide rails. The external stirring gear rotation tracks (225) are provided with a plurality of circular rollers circumferentially for facilitating the rotation of the external stirring gear (208). The front protection plate (222) and the rear protection plate (223) are both fixed in the stirring sleeve housing (200); the external stirring gear (208) is also provided with a plurality of secondary gears (221) circumferentially for driving the external stirring gear (208) to rotate. Each of the secondary gears (221) is rotationally fixed by a front protective plate (222) and a rear protective plate (223), and a plurality of primary gears (220) are provided around the circumference of each secondary gear (221) for driving the secondary gear (221) to rotate. The torsion bar of each primary gear (220) is fixedly connected to the rotating shaft of a torque motor (218) via a coupling (219), and the torque motor (218) is fixedly arranged on the outer wall of the stirring sleeve housing (200) and is connected to the battery in the stirring sleeve battery compartment (207).

7. The fire extinguishing device according to claim 6, characterized in that: The torque motor (218) is arranged in the circumference of the stirring sleeve battery compartment (207), and a torsion bar protection groove (224) for fixing the torsion bar is also fixed on the outer wall of the stirring sleeve housing (200).

8. The fire extinguishing device according to claim 1, characterized in that: The built-in fire-fighting gas tank (109) and the nitrogen gas tank (110) are fixedly arranged between the outer shell (119) of the cooling sleeve and the inner shell of the cooling sleeve. Each built-in fire-fighting gas tank (109) is equipped with an external fire-fighting gas tank (106). The built-in fire-fighting gas tank (109) and the external fire-fighting gas tank (106) are connected through an air charging pipe (108). The external fire-fighting gas tank (106) is fixed on the outer wall of the outer shell (119) of the cooling sleeve. A plurality of deceleration clips (104) are evenly fixed around the circumference of the inner shell of the cooling sleeve. The deceleration clips (104) are used to control the sliding speed of the cooling sleeve (1) when it slides down along the inclined cable (300). Each deceleration clip (104) is composed of a push rod and a deceleration plate. The fixed end of the push rod is fixed to the inner shell of the cooling sleeve. The deceleration plate is fixedly connected to the movable end of the push rod. The push rod is connected to the battery in the battery compartment (100) of the cooling sleeve and is controlled by the control electrical box (112).

9. The fire extinguishing device according to claim 1, characterized in that: The stirring sleeve (2) and the cooling sleeve (1) are both symmetrical structures of two halves.

10. A safety monitoring and early warning system for a stay cable, characterized in that: The details are as follows: The safety monitoring and early warning system includes a remote control room and a fire extinguishing device according to any one of claims 1 to 9. The safety monitoring and early warning system is connected to a big data platform, and monitors the current of the light strip (301), weather conditions, and vehicle conditions on the bridge, and performs big data analysis on the fire risk of the light strip (301), and adopts the extreme gradient boosting method for machine learning; each inclined cable is provided with a plurality of temperature sensors, and each temperature sensor is connected to the safety monitoring and early warning system. The background monitoring data of the fire extinguishing device is directly stored in the control electrical box (112), and the background monitoring data of the fire extinguishing device includes data of the temperature sensor, speed sensor, and gas concentration sensor arranged in the fire extinguishing device. When the fire extinguishing device is separated from the bridge tower, the real-time monitoring data is transmitted to the safety monitoring and early warning system by wireless signals; During daily operation, the safety monitoring and early warning system uses the light strip current, weather conditions, vehicle driving conditions, light strip images, and cable (300) temperature data as input features to the extreme gradient boosting model, and the derived color labels are the fire risk warnings of the light strips, that is, the fire risks are divided into: green warning, yellow warning, and red warning; For a green warning, the safety monitoring and warning system does not respond; for a yellow warning, the safety monitoring and warning system will sound an alarm in the duty room, notifying the duty personnel to pay close attention to the situation on the bridge, and automatically cancel the alarm after the data returns to normal; for a red warning, the safety monitoring and warning system will still first notify the duty personnel in the duty room, and then automatically release the fire extinguishing device to extinguish the fire light strip (301), and at the same time send an evacuation signal to the vehicles on the bridge.

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