Fire extinguishing device for stay cable and safety monitoring and early warning system

Abstract

The invention belongs to the technical field of bridge cable protection, and particularly relates to a fire extinguishing device for a stay cable and a safety monitoring and early warning system. Fire fighting gas is adopted to extinguish a lamp strip fire, secondary disasters caused by electrification of the lamp strip are avoided, the fire fighting gas extinguishes fire rapidly, toxic substances are not generated, the fire extinguishing efficiency is improved, and meanwhile safety is taken into consideration; the crushing device can crush the lamp strip on the cable and then discharge the lamp strip through a waste material port, and a fire source on the stay cable is rapidly stripped; the fireproof cloth and ancillary facilities thereof can be combined with the cooling sleeve and the stirring sleeve to form a temporary closed space around the stay cable, so that fire-fighting gas sprayed by the cooling sleeve can quickly reach the fire extinguishing concentration, and part of overflowing fire-fighting gas can be discharged from the crushing device through the fire-fighting gas release window; and therefore, the effect of cooling the crushing device and the crushing lamp strip is achieved, the utilization efficiency of fire fighting gas is improved, and good economical efficiency is achieved.

Description

Technical Field

[0001] The 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 a stay cable. Background Art

[0002] Cable-stayed bridges are beautiful in appearance and have long spans, so they are often selected as long-span bridges. However, as the main load-bearing components of cable-stayed bridges, cable-stayed cables lose their performance very quickly under the action of fire. According to relevant studies, cable-stayed cables will lose most of their strength in a 600°C environment, causing component failure, which will change the stress state of the entire bridge and lead to catastrophic consequences. Therefore, the fire resistance of cable-stayed cables has always been an important topic in the field of bridges. A cable-stayed bridge caught fire due to a short circuit in the light strip on the cable, causing the cable to catch fire and burn, deform and break. The fire on the light strip on the cable is different from the traditional research on the fire on the bridge deck that affects the cable-stayed cable. First, the light strip is directly attached to the surface of the cable-stayed cable, and the fire source will not be affected by the wind. Secondly, the fire caused by the light strip is an electrical fire, and there are limitations on fire-fighting methods.

[0003] Most of the existing technologies are to design protective coatings for the cables themselves to enhance their fire resistance, or to use liquid and foam fire extinguishing agents to achieve the purpose of fire prevention and fire extinguishing. When the cable light strip catches fire, the flame will adhere to the surface of the cable and burn continuously, which will cause great damage to the carrying capacity of the cable. In addition, the light strip itself is charged, and the use of liquid fire extinguishing may cause secondary disasters due to the charged light strip. In addition, the liquid itself has a high density, and the storage space on the bridge is limited. The storage capacity of fire extinguishing agents is limited, which limits the fire extinguishing efficiency. The cable itself has a small diameter, and the fire foam adhesion rate is low, which greatly reduces the fire extinguishing 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 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 set outside the inclined cable and is used to cover the fire point and keep the fire-fighting gas at a certain concentration when extinguishing the fire;

[0008] A stirring sleeve, which 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 on one end of the cooling sleeve. The bridge tower is welded with a mounting base block. The connecting column is connected to the mounting base block through an electric control separation device. An electrical plug is stored in the connecting column to charge the cooling sleeve battery compartment, 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, cooling sleeve connecting plates are welded at the upper and lower ends of the cooling sleeve shell to merge the cooling sleeve into a whole. The inner circumference of the cooling sleeve shell of the cooling sleeve is uniform. A plurality of built-in fire-fighting gas tanks are fixedly provided, 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 inclined cable, and 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, and the safety valve is a three-way valve. The nitrogen gas tank is connected to the safety valve through a nitrogen charging pipe, and 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 arranged on the road. The safety valve is a master safety valve used to control whether the nozzle sprays gas. The nozzles are evenly arranged around the inclined cable, and the nozzles are opened and closed by the safety valve; a cooling sleeve battery compartment for powering the safety valve is also fixed on one end of the cooling sleeve close to the bridge tower. The cooling sleeve battery compartment and the cooling sleeve shell are connected to the control electrical box by inserting the battery compartment connection key into the battery compartment connection hole. The battery compartment connection key and the electric control electrical box are connected to the necessary electrical connectors, wherein 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 electric control separation device are controlled by the control electrical box; the control electrical box is installed in the cooling sleeve shell and close to the cooling sleeve battery compartment; a battery status detection sensor, a temperature sensor and a speed sensor for monitoring the battery capacity are distributed in the cooling sleeve battery compartment; a temperature sensor, a speed sensor and a gas concentration sensor are arranged on one side of the inclined cable of the cooling sleeve shell, and a temperature sensor is installed at the position of each nozzle.

[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 is provided 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 reciprocate on the zipper head connecting rod. One end of the zipper head connecting rod is rotationally fixed with 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 being folded, the fireproof cloth is arranged in the fireproof cloth placement room of the stirring sleeve; the zipper motor is fixed in the installation slot of the electric telescopic rod 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, and 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 room, while the zipper head remains relatively still with the stirring sleeve, so that the fireproof cloth will be closed, and after the fireproof cloth is completely pulled out, the zipper head connecting rod will be shortened under the drive of the zipper motor, and the two zipper heads will be closed, so that 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 sheet 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 sheet, 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 sheet, and is fixed by driving a rivet, and the other end is pressed between the fireproof cloth gasket and the fireproof cloth installation groove and is fixed by driving a rivet. The part of the fireproof cloth fixed at the cooling sleeve end does not need to be installed with a zipper track.

[0012] Furthermore, the outer circumference of the fireproof cloth slide away from one end of the flange is also provided with a plurality of leveling wheels for leveling the fireproof cloth when the fireproof cloth is drawn out. The positions where the leveling wheels contact the fireproof cloth are two rollers, and the leveling wheels are fixed to the inner circumference of the inner sleeve by compression springs. The leveling wheels can press the fireproof cloth onto the fireproof cloth slide without causing 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 close to 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 outside 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 a 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 arranged 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 in the circumference of the large end of the gas sleeve, and a steel fence with a high density is installed in 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, and a temperature sensor is installed in the gas sleeve; an outer stirring gear is provided in the circumference of the inner stirring gear, and the outer teeth of the inner stirring gear are spirally arranged in the opposite direction to the inner teeth of the outer stirring gear; the outer stirring gear is arranged 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 rotating 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 rotating tracks for facilitating the rotation of the outer stirring gear, and the front protective plate and the rear protective plate are both fixed in the outer shell of the stirring sleeve; 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, and each of the secondary gears is rotationally fixed by the front protective plate and the rear protective plate, and a plurality of primary gears for driving the rotation of the secondary gear are provided in the circumference of each of the secondary gears, and the torsion bar of each of the primary gears is fixedly connected to the rotating shaft of the torque motor through a coupling, and the torque motor is fixedly arranged on the outer wall of the stirring sleeve shell and is connected to the battery in the battery compartment of the stirring sleeve; 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 in the circumference of the battery compartment of the stirring sleeve, 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. The external fire-fighting gas tanks are 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. 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 a jet pipe. The nozzle is 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 far 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. 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 speed reduction clamps are evenly fixed on the circumference of the inner shell of the cooling sleeve. The speed reduction clamps are used to control the sliding speed of the cooling sleeve when it slides down along the inclined cable. Each of the speed reduction clamps is composed of a push rod and a speed reduction plate. The fixed end of the push rod is fixed on the inner shell of the cooling sleeve, and the speed reduction 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 two-half symmetrical structures.

[0018] Preferably, the selection of fire-fighting gas should take into account both economy and safety, and should meet the conditions of no chemical reaction, environmental friendliness, non-toxicity and non-corrosiveness, and good electrical insulation performance.

[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 battery 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 battery to ensure that the battery is working properly.

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

[0021] Preferably, the volume of the external fire-fighting gas tank in the fire-fighting 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 barometer should be placed in the external fire-fighting gas tank and the part of the internal fire-fighting gas tank far 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 reducer clamp contacts the inclined cable to prevent the speed reducer clamp from damaging the outer coating of the inclined cable.

[0024] Preferably, the battery used in the present invention should be sufficiently safe, and a battery type with high energy density should be used on the basis of meeting the battery reliability requirements in national standards. The aging of the battery should be checked regularly to prevent accidents caused by quality problems of the battery itself.

[0025] Preferably, the steel plates of each layer of the shell of the cooling sleeve and 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 phenomenon, effectively avoids the interference of other electromagnetic waves to the circuit, and improves 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 pipelines 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 spray volume and spray position of the fire-fighting gas can be controlled according to the fire situation, thereby reducing the waste of fire-fighting gas and improving the utilization rate.

[0028] Preferably, the protective cloth should be of a type with 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 mounting hole of the connecting box. The long screw may contact the high-temperature light strip during the device's effectiveness, so it is necessary to have a certain amount of high-temperature performance. The joints of the cooling sleeve shell and the stirring sleeve shell should be filled with rubber strips to ensure airtightness. After each fire occurs and the device is put into effect, all rubber products in the device should be replaced.

[0030] Preferably, the outside of the gas sleeve should be covered with a layer of fire-resistant coating 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 external stirring gear is controlled at 20 rpm-30 rpm, and 1.6 times of the power required by the first-stage gear calculated according to the gear ratio of each stage of gears 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 Specifications". After selecting the pressure level and fire-fighting gas, the appropriate value should be selected based on the time required to reach the gas fire-fighting 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-making 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, which is as follows:

[0039] The safety monitoring and early warning system is composed 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 at the positions of the cable-stayed light strip near the tower top and the beam top respectively; a six-parameter meteorological sensor is arranged on the top of the cable-stayed bridge tower, and the safety monitoring and early warning system is connected to various cameras and meteorological centers on the bridge to obtain the driving trajectory of vehicles on the bridge, the image of the light strip and the local meteorological conditions in real time, 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 provided with multiple temperature sensors, each temperature sensor is connected to the safety monitoring and early warning system, and 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 the data of the temperature sensor, speed sensor and gas concentration sensor arranged 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 with the safety monitoring and early warning system;

[0040] The safety monitoring and early warning system uses the current of the light strip, weather conditions, vehicle driving conditions, light strip images, and the temperature of the inclined cable as input features to the extreme gradient boosting model, and the derived color labels are the fire risks of the light strips, that is, the fire risks are divided into: green warning (the index is within the safe range), yellow warning (the index slightly exceeds the limit and the deterioration is not obvious), and red warning (the index seriously exceeds the limit and continues to deteriorate). Among them, the green risk value in 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 is convenient for workers to locate the inclined cables with disaster risks. A projection device should be installed at the bottom of the cable tower to drop 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] Where: I JS - calculate the current;

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

[0047] I X —The 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 monitored current 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 Real-time monitoring is performed. If T s The rate of increase is low, and it rises to less than 100℃ within 1min. At this time, the corresponding label is yellow. s The temperature rises very quickly and can quickly reach over 100°C within 1 minute. At this time, it is considered that there is a high probability of fire hazard in the lamp strip, 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 days and cloudy days are marked as green labels, bad 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 have speeding or other violations, but the vehicles engaging in dangerous behavior are small-sized vehicles, and heavy-loaded vehicles are far away from the inclined cables) is marked with a yellow label; poor vehicle driving conditions (vehicles on the bridge are speeding and heavy-loaded vehicles are also engaging in dangerous behavior or there are serious traffic accidents on the bridge) is marked with a red label.

[0051] Light strip image: When the camera on the bridge detects that the light strip is emitting stable light and is installed in the correct position on the cable-stayed cable, it is marked with a green label. When the camera on the bridge detects that the light strip is emitting unstable light, the structure is damaged, or the installation is destroyed by external force, it is marked with a red label.

[0052] Among them, considering that machine learning takes a long time from feature input to prediction result output, and the time interval from collecting abnormal data to the occurrence of danger in the light strip fire process is much shorter than the time taken by machine learning, it is unrealistic to use machine learning methods to directly predict the danger of light strips. Therefore, this system only uses machine learning methods to calculate the importance coefficient of each parameter, and then calculates the weighted sum of each feature and compares it with the specified limit to determine whether the light strip has a fire risk. Only four features that affect the fire risk of light strips are listed here. In fact, there may be more features, which can be added or replaced according to actual conditions, but there must be at least one feature and the features should have a weak correlation.

[0053] Furthermore, the bridge light strip fire accident and the above four characteristics when the accident occurred 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 is not discussed here. Then extract the SHAP value λ of each feature 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, and 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] It can also be seen that the results of machine learning should be updated in a timely manner to ensure the reliability of the safety monitoring and early warning system. Considering the problem of learning resource occupation of machine learning, the update time of the parameters meets the following requirements:

[0060]

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

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

[0063] Table 1 Index classification table

[0064]

[0065] For green warnings, the safety monitoring and warning system does not respond; for yellow warnings, the safety monitoring and warning system will issue 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 warnings, 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 effectively reduce D in time t The safety monitoring and early warning system will automatically release the fire extinguishing and disaster reduction device and send an evacuation signal to the vehicles on the bridge. The projection equipment at the bottom of the 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 gliding 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 enable the fire extinguishing device to quickly move to the temperature sensor position with abnormal temperature on the upper cable closest to it under the dual effects of gravity and electricity. In 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; in 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 the movement, the deceleration clamp makes appropriate deceleration action to help the fireproof cloth be pulled out from the mixing sleeve. During the pulling process, the speed sensor in the leveling wheel measures the pulling speed of the fireproof cloth twice per second, and the gas concentration sensor transmits the gas concentration to the battery compartment of the mixing sleeve and the decision-making computer in the control electrical box once per second. The computer automatically adjusts the speed of the traveling wheel so that the fireproof cloth can be fully pulled out before reaching the abnormal temperature point and can adjust the nozzle spray rate so that the heptafluoropropane reaches and maintains the fire extinguishing concentration before the 50% nozzle starts working. After the fireproof cloth is fully pulled out, the first zipper head and the second zipper head can be completely closed under the action of the zipper motor. During this process, the safety valve is always in the open state. Before reaching the abnormal temperature point, 20% of the nozzles start working; when they are 10m away from the abnormal temperature point, 50% of the nozzles start working; when they are 5m away from the abnormal temperature point, all the nozzles start working. During this period, the spraying position and spraying amount of the nozzles 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 a speed of 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 it is shown that the temperature in the gas sleeve is high but the temperature in the cooling sleeve drops significantly but does not reach the fire extinguishing temperature requirement, it should be decelerated immediately until the temperature in the cooling sleeve can reach the fire extinguishing temperature. After the temperature monitoring in the fire extinguishing device is all normal, according to the temperature data on the inclined cable transmitted back by the remote control room in real time, the fire extinguishing device accelerates to the next abnormal temperature point, and repeats the above operations to extinguish or cool down. During the movement to the next abnormal point, the nozzles keep working, but the spraying rate is reduced to 50% of the maximum spraying rate until the abnormal temperature point on the single inclined cable disappears;

[0067] 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 that controls the electrical box in the fire extinguishing device, and the subsequent fire extinguishing and disaster reduction tasks are performed by 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 the fire of the light strip, thus avoiding the secondary disaster caused by the light strip being electrified. The firefighting gas can extinguish the fire quickly without producing toxic substances, thus improving the firefighting efficiency while taking into account safety. The crushing device can crush the light strip on the cable and discharge it 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 strip, thus 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 inclined cable using its own weight and the traveling wheel motor, with fast travel speed and high firefighting efficiency. When there is no fire on the inclined cable, the fireproof cloth is stacked and placed in the fireproof cloth placement room, which reduces the length of the device and reduces the impact of the device on the vibration of the inclined 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 present invention.

[0071] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 It 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 It is a schematic diagram of the second three-dimensional structure of the cooling sleeve of the present invention;

[0076] Figure 5 A side view of a cooling sleeve of the present invention connected to a 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] Fig. 9 for Figure 6 1C-1C sectional view;

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

[0082] Fig.11 It is a side view of the cooling sleeve of the present invention connected to the fireproof cloth on one side without the fire gas storage box;

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

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

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

[0086] Fig.15 It is a schematic diagram of the second three-dimensional structure of the stirring sleeve of the present invention;

[0087] Fig.16 This is a schematic diagram of the discharge port structure of the stirring sleeve of the present invention;

[0088] Fig.17 A side view of a stirring sleeve of the present invention with a fireproof cloth installed on one side;

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

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

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

[0092] Fig.21 This is a schematic diagram of the structure of the crushing device of the present invention;

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

[0094] Fig.23 for Fig. 22AA section view;

[0095] Fig.24 It is a schematic diagram of the installation structure of the fire extinguishing device of the present invention;

[0096] Fig.25 The following is a work flow chart of the safety monitoring and early warning system of the present invention.

[0097] Among them: 1 is a cooling sleeve; 2 is a stirring sleeve; 3 is a stay cable and an attached light strip; 4 is a fireproof cloth gasket; 5 is a fireproof cloth installation track; 6 is a fireproof cloth and its attached devices; 7 is an installation base block; 8 is a connecting column; 100 is a cooling sleeve battery compartment; 101 is a cooling sleeve connecting piece; 102 is a fire gas storage box; 103 is a nozzle; 104 is a speed reduction clamp; 105 is a fireproof cloth installation slot; 106 is an external fire gas tank; 107 is a gas tank stiffening rib; 108 is Inflating pipe; 109 is a built-in fire gas tank; 110 is a nitrogen gas tank; 111 is a gas tank bracket; 112 is a control electrical box; 113 is a built-in gas tank partition; 114 is an injection pipe; 115 is a safety valve; 116 is a nitrogen charging pipe; 117 is a battery compartment installation hole; 118 is a battery compartment connection key; 119 is a cooling sleeve shell; 200 is a stirring sleeve shell; 201 is a gear box; 202 is a stirring sleeve connection box; 203 is a stirring sleeve connection piece ; 204 is a leveling wheel; 205 is a slideway for fireproof cloth; 206 is a traveling wheel; 207 is a battery compartment for the stirring sleeve; 208 is an outer stirring gear; 209 is an inner stirring gear; 210 is a mounting notch for the electric telescopic rod; 211 is a pressing plate for installing the fireproof cloth; 212 is a room for placing the fireproof cloth; 213 is a fire-fighting gas release window; 214 is a connection box mounting hole; 215 is a crushing device; 216 is a gas sleeve; 217 is an inner sleeve; 218 is a torque motor; 219 is a coupling; 220 is a primary gear; 221 is a secondary 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] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only 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 solution of the present invention, the present invention is further described in detail below in conjunction with 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] The fireproof cloth 600 is set outside the inclined cable 300 to cover the fire point and keep the firefighting gas at a certain concentration when extinguishing the fire; see Figure 2 As shown;

[0103] The stirring sleeve 2 is 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 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 of the cooling sleeve 1. The bridge tower is welded with a mounting base block 7. The connecting column 8 is connected to the mounting base block 7 through an electric control separation device. An electrical plug is stored in the connecting column 8 to charge the cooling sleeve battery compartment 100, and 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 circumferential direction 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 on the inner wall of the cooling sleeve shell 119. The built-in fire-fighting gas tank 109 is 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 arranged on the nitrogen charging pipeline 116. The safety valve 115 is a master safety valve for controlling whether the nozzle 103 sprays gas. The nozzles 103 are evenly arranged 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 connection key 118 into the battery compartment connection hole 117. The battery compartment connection 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 electric control separation device are controlled by the control electrical box 112; the control electrical box 112 is installed in the cooling sleeve shell 119 and 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, a temperature sensor and a speed sensor for monitoring the battery capacity; the cooling sleeve shell 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 make reciprocating motion on the zipper head connecting rod 603. One end of the zipper head connecting rod 603 is rotationally 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, and 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 still 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, and the two zipper heads 602 will be closed. 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 for a certain distance. One end of the fireproof cloth slide 205 is fixedly connected to a flange arranged 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 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 slideway 205 and the fireproof cloth pressing plate 211 and fixed by rivets, and the other end is pressed between the fireproof cloth gasket 4 and the fireproof cloth installation groove 105 and fixed by rivets. The part of the fireproof cloth 600 fixed at the cooling sleeve 1 end does not need to be installed with the zipper track 601; see Figure 2 shown.

[0107] Furthermore, the outer circumference of the fireproof cloth slideway 205 away from one end of the flange is also provided with a plurality of leveling wheels 204 for leveling the fireproof cloth 600 when the fireproof cloth 600 is drawn out, and 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, and 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 Fig.17 , 18 , as shown in Figure 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 outside 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 further 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-fighting gas release device 216. 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 circumferentially 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 provided with an outer stirring gear rotating track 225 adapted to the circular slide rail. 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 circumferentially for driving the outer stirring gear 208 to rotate. Gear 221, each of the secondary gears 221 is rotatably fixed 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 the secondary gears 221 to rotate, and the torsion bar of each primary gear 220 is fixedly connected to the rotating shaft of a torque motor 218 through 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; a waste port 226 for discharging the broken light strip is formed by opening a hole at the bottom of the stirring sleeve housing 200; see Figure 19-21 shown.

[0110] Furthermore, 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; see Fig. 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 a fire-fighting gas storage box 102. 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 gas pipe 114 is connected with 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 far away from the external fire-fighting gas tank 106 is not connected to any pipe, and the jet pipe 114 is connected with 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 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 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 installation of the fire extinguishing device should be completed before installing the light strip on the inclined cable. Before installation, the length and diameter of the fireproof cloth 600 should be estimated first, and the nozzle 103 should be selected. The length is recommended to be 1 / 30 of the protection cable length, but not less than 2m, and the diameter is 1cm larger than the protected inclined cable. Heptafluoropropane is selected as the fire-fighting gas, and its fire-fighting concentration is 7%. The fire-fighting length is 1 / 2 of the cable length, and the concentration is required to be reached within 10s. From this, the required volume of each fire-fighting gas tank can be estimated as follows:

[0115]

[0116] Wherein: L is the length of the inclined cable 300, and 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 inclined cable 300, that is, the cooling sleeve 1, the stirring sleeve 2, the fireproof cloth and its accessories 6 should all be assembled, and the fireproof cloth 600 should be stacked and stored in the stirring sleeve, and then the assembly should be started at the bottom of the inclined cable 300. First, the stirring sleeve 2 is installed on the inclined cable 300, and then the fireproof cloth 600 is inserted into the fireproof cloth installation track 5, and then the part of the fireproof cloth 600 without the zipper track 601 is pressed into the fireproof cloth installation groove 105, and the fireproof cloth gasket 4 is pressed in, and then the bolts are installed to fix the fireproof cloth gasket 4, and then the fireproof cloth installation track 5 is connected with the fireproof cloth gasket 4 using bolts. 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 is 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 together with the zipper motor 604 at the other end of the zipper track near the stirring sleeve 2, and the zipper motor 604 has been installed into the electric telescopic rod installation slot 210. After the installation is completed, the whole 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 loosened, 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, which is specifically as follows:

[0122] See also Fig.25As shown, the safety monitoring and early warning system is composed 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 arranged at the positions of the cable-stayed cable 300 light strip near the tower top and the beam top respectively; a six-parameter meteorological sensor is arranged on the top of the cable-stayed bridge tower, and the safety monitoring and early warning system is connected to various cameras on the bridge and the meteorological center to obtain the driving trajectory of vehicles on the bridge, the image of the light strip 301 and the local meteorological conditions in real time, and conduct big data analysis on the fire risk of the light strip 301, and use the extreme gradient boosting method for machine learning;

[0123] Each of the inclined cables 300 is provided with a plurality of 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 the data of the temperature sensor, speed sensor and gas concentration sensor provided 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 through wireless signals and the safety monitoring and early warning system.

[0124] The safety monitoring and early warning system uses the current of the light strip, weather conditions, vehicle driving conditions, the image of the light strip 301, and the temperature of the inclined cable 300 as input features to the extreme gradient boosting model, and the derived color labels are the fire risks of the light strip 301, that is, the fire risks are divided into: green warning (the index is within the safe range), yellow warning (the index slightly exceeds the limit and the deterioration is not obvious), and red warning (the index seriously exceeds the limit and continues to deteriorate). Among them, the green risk value in each feature is 0, the yellow label is 0.5, and the red label is 1.

[0125] A small signal light is installed on the fire extinguishing and disaster reduction device. The color of the signal light is the same as the fire risk color calculated by the safety monitoring and early warning system, which is convenient for workers to locate the inclined cable 300 with disaster risk. A projection device should be installed at the bottom of the cable tower to drop 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] Where: I JS - Calculate the current;

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

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

[0132] Take the 300° temperature of the inclined cable as the real-time temperature T of the light strip s When the monitored current 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 Real-time monitoring is performed. If T s The rate of increase is low, and it rises to less than 100℃ within 1min. At this time, the corresponding label is yellow. s The temperature rises very quickly and can quickly reach over 100°C within 1 minute. At this time, it is considered that there is a high probability of fire hazard in the lamp strip, 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 days and cloudy days are marked as green labels, bad 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 have speeding or other violations, but the vehicles engaging in dangerous behavior are small-sized vehicles, and the heavy-loaded vehicles are far away from the 300-meter cable) is marked with a yellow label; poor vehicle driving conditions (vehicles on the bridge are speeding and heavy-loaded vehicles are also engaging in dangerous behavior or there are serious traffic accidents on the bridge) is marked with a red label.

[0135] Light strip image: When the camera on the bridge detects that the light strip is emitting stable light and is installed in a normal position on the cable-stayed cable 300, it is marked with a green label. When 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 force, it is marked with a red label.

[0136] Among them, considering that machine learning takes a long time from feature input to prediction result output, and the time interval from collecting abnormal data to the occurrence of danger in light strip 301 during the fire process of light strip 301 is much shorter than the time taken by machine learning, it is unrealistic to use machine learning methods to directly predict the danger of light strip 301. Therefore, this system only uses machine learning methods to calculate the importance coefficient of each parameter, 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. There may be more features in reality, which can be added or replaced according to actual conditions, but there must be at least 4 features and there should be weak correlation between the features.

[0137] Furthermore, the bridge light strip 301 fire accident and the above four characteristics when the accident occurred 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 labor. It is not discussed here. Then extract the SHAP value λ of each feature 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 cable 300 light strip at time t is calculated according to the label type of each feature obtained by the sensor, and 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] It can also be seen that the results of machine learning should be updated in a timely manner to ensure the reliability of the safety monitoring and early warning system. Considering the problem of learning resource occupation of machine learning, the update time of the parameters meets the following requirements:

[0144]

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

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

[0147] Table 2 Index classification table

[0148]

[0149] For green warnings, the safety monitoring and warning system does not respond; for yellow warnings, the safety monitoring and warning system will issue 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 warnings, 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 effectively reduce D in time t The safety monitoring and early warning system will automatically release the fire extinguishing and disaster reduction device and send an evacuation signal to the vehicles on the bridge. The projection equipment at the bottom of the 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 command 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 enable the fire extinguishing device to quickly move to the temperature sensor position with abnormal temperature on the upper temperature of the nearest inclined cable 300 under the dual effects 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, and the spraying rate is 50% of the maximum spraying 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 timely extinguish or cool down the inclined cable 300 when it slides to the abnormal temperature point; during this process, the crushing device 215 starts, and the internal stirring gear 209 scoops up the light strip and rolls it into the gap between it and the external stirring gear 208 for crushing, and then it is discharged from the waste port 226 after crushing. During the movement, the deceleration clamp 104 makes appropriate deceleration action to help the fireproof cloth 600 be pulled out from the stirring sleeve 2. During the pulling 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 to the battery compartment 207 of the stirring sleeve and the decision computer in the control electrical box 112 once per second. The computer automatically adjusts the speed of the traveling wheel 206 so that the fireproof cloth 600 can be fully pulled out before reaching the abnormal temperature point and can adjust the spraying rate of the nozzle 103 so that the heptafluoropropane reaches and maintains the fire extinguishing concentration before the 50% nozzle starts working. After the fireproof cloth 600 is fully pulled out, the first zipper head 602A and the second zipper head 602B can be fully closed under the action of the zipper motor 604. During this process, the safety valve 115 is always in an 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 decelerate to a speed of 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 it shows that the gas If the temperature in the sleeve 216 is high but the temperature in the cooling sleeve 1 drops significantly but does not reach the fire extinguishing temperature requirement, the speed should be reduced immediately until the temperature in the cooling sleeve 1 can reach the fire extinguishing temperature. After the temperature monitoring in the fire extinguishing device is normal, the fire extinguishing device is accelerated to move to the next abnormal temperature point according to 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 cool down. During the movement to the next abnormal point, the nozzle 103 keeps working, 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 performed by the decision-making computer.

[0152] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can 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 what has been described above and that various modifications and changes may be made without departing from its scope. 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), which is sleeved 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), wherein the stirring sleeve (2) is 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 is 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 also provided between the fireproof cloth placement chamber (212) and the crushing device (215); A cooling sleeve (1), wherein the cooling sleeve (1) is sleeved on the inclined cable (300), one end of which is connected to the bridge tower through an electric control 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 arranged 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), each of the nitrogen gas tanks (110) is fixedly arranged in the cooling sleeve shell (119), and the built-in fire-fighting gas tanks (109) and the nitrogen gas tanks (110) are fixedly arranged in the cooling sleeve shell (119). (110) are connected to the nozzle (103) through the safety valve (115); the nozzles (103) are evenly arranged around the inclined cable (300); the nozzles (103) are controlled to open and close through the safety valve (115); a cooling sleeve battery compartment (100) for supplying power to the safety valve (115) is also fixed to one end of the cooling sleeve (1) close to the bridge tower; 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 tubular structure by a zipper arranged in the axial direction thereof. The end of the zipper close to the stirring sleeve (2) is provided with a first zipper head (603A), and the end close to the cooling sleeve (1) is provided with a second zipper head (603B). 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 reciprocate on the zipper head connecting rod (603). One end of the zipper head connecting rod (603) is connected to the first zipper head (603). A) is rotated and fixed, passes through a first zipper head (603A) and is fixedly connected to a rotating shaft of a zipper motor (604), and the first zipper head (603A) is fixedly connected to the zipper motor (604); the fireproof cloth (600) between the first zipper head (603A) and the second zipper head (603B) is folded and arranged in a 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 a battery in a battery compartment (207) of the stirring sleeve.

3. The fire extinguishing device according to claim 1, characterized in that: A fireproof cloth slideway (205) is also provided at one end of the stirring sleeve (2) close to the fireproof cloth (600) and extending into the stirring sleeve (2) for 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 sheet (211) for fixing the fireproof cloth (600) is also 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 also provided with a plurality of leveling wheels (204) for leveling the fireproof cloth (600) when the fireproof cloth (600) is drawn out. The leveling wheels (204) are fixed to the inner circumference of the inner sleeve (217) by 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) for controlling the stirring sleeve (2) to accelerate or decelerate downward on the inclined cable (300) on the inner circumference of one end of the flange. The traveling wheels (206) include a hub motor and a tire mounted outside 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 a 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 arranged on the inner wall of the stirring sleeve housing (200); the small end of the gas sleeve (216) is fixedly connected to the inner stirring gear (209) of the crushing device (215); the small end of the gas sleeve (216) is fixedly arranged 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 to pass through the inclined cable (300) and remove the inclined cable. (300) upper light strip (301); a fire gas release window (213) is also provided in the circumference of the large end of the gas sleeve (216); an outer stirring gear (208) is provided in 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 reverse spirals; 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 arranged on both sides of the outer stirring gear (208) and between the inner teeth and the outer teeth. A circular slide rail is provided, and the front protection plate (222) and the rear protection plate (223) are both provided with an external stirring gear rotating track (225) adapted to the circular slide rail. A plurality of circular rollers are provided on the circumference of the external stirring gear rotating track (225) to facilitate 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); a plurality of secondary gears (221) for driving the external stirring gear (208) to rotate are also provided on the circumference of the external stirring gear (208). Each of the secondary gears (221) is rotatably fixed by a front protective plate (222) and a rear protective plate (223); a plurality of primary gears (220) are arranged around the circumference of each of the secondary gears (221) to drive the secondary gears (221) to rotate; a torsion bar of each of the primary gears (220) is fixedly connected to a rotating shaft of a torque motor (218) via a coupling (219); the torque motor (218) is fixedly arranged on an outer wall of a stirring sleeve housing (200) and is connected to a battery in a 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 fixedly provided on the outer wall of the stirring sleeve housing (200).

8. The fire extinguishing device according to claim 1, characterized in that: The internal fire-fighting gas tank (109) and the nitrogen gas tank (110) are both fixedly arranged between the outer shell (119) of the cooling sleeve and the inner shell of the cooling sleeve. Each of the internal fire-fighting gas tanks (109) is equipped with an external fire-fighting gas tank (106). The internal fire-fighting gas tank (109) and the external fire-fighting gas tank (106) are connected via an air charging pipe (108). The external fire-fighting gas tank (106) is fixedly arranged on the outer wall of the outer shell (119) of the cooling sleeve. A plurality of deceleration clamps (104) are evenly fixedly arranged around the circumference of the inner shell, and the deceleration clamps (104) are used to control the sliding speed of the cooling sleeve (1) when it slides down along 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 inner shell of the cooling sleeve, 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 (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 comprises a remote control room and a fire extinguishing device as claimed in any one of claims 1 to 9, wherein the safety monitoring and early warning system is connected to a big data platform, and the current size, weather conditions, and vehicle conditions on the light strip (301) are monitored, and the fire risk of the light strip (301) is analyzed by big data, and machine learning is performed using an extreme gradient boosting method; 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, and the background monitoring data of the fire extinguishing device is directly stored in a control electrical box (112), and the background monitoring data of the fire extinguishing device includes data of a temperature sensor, a speed sensor, and a gas concentration sensor arranged in the fire extinguishing device, and when the fire extinguishing device is separated from the bridge tower, wireless signals are used to transmit real-time monitoring data to the safety monitoring and early warning system; 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 fire risk warnings of the light strip, 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 make a warning response; 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 and disaster reduction device to extinguish the fire on the fire light strip (301), and at the same time send an evacuation signal to the vehicles on the bridge.

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