Fire extinguishing method and system for underground pipe gallery

Abstract

The present application relates to the technical field of artificial intelligence and fire monitoring, and provides an underground pipe gallery fire extinguishing method and system, which comprises the following steps: determining a next behavior decision sequence according to current fire spread information, current fire information, current positions of at least one target fire extinguisher, and a current fire point position of a fire point; generating a next control instruction according to the next behavior decision sequence; and sending the next behavior decision sequence to a movable slide rail where each of the at least one target fire extinguisher is located, wherein the next behavior decision sequence is used to control the movable slide rail where each of the at least one target fire extinguisher is located to slide along a fixed track according to a next running parameter indicated by a next motion control parameter, so as to drive the at least one target fire extinguisher to slide, so that the at least one target fire extinguisher extinguishes the fire at the fire point.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of artificial intelligence and fire monitoring, and particularly relates to a method and system for extinguishing fire in an underground pipe gallery. BACKGROUND

[0002] The underground pipe gallery is an important passage for centralized laying of power, communication, water supply and drainage, gas and other municipal pipelines in modern urban infrastructure, and has the characteristics of dense lines, long and narrow space structure, poor ventilation, humid environment or poor lighting conditions. At the same time, due to the existence of live cables and combustible materials inside, once a fire occurs, it is easy to cause smoke and toxic gas to spread rapidly and the temperature to rise sharply. If the fire spreads rapidly, the difficulty of extinguishing the fire will be greatly increased.

[0003] In the related art, the underground pipe gallery fire extinguishing method adopts a fixed layout scheme. However, the fire extinguishing efficiency and effectiveness are low. SUMMARY

[0004] In view of the above problems, the present application provides a method and system for extinguishing fire in an underground pipe gallery.

[0005] The present application provides a method for extinguishing fire in an underground pipe gallery, comprising: determining a next behavior decision sequence according to current fire spread information, current fire information, current fire extinguisher positions of at least one target fire extinguisher, and a current fire point position of a fire point, wherein the current fire spread information indicates a current fire spread range and a current fire spread speed, the current fire information indicates at least one of a physical energy state or an evolution intensity of the current fire, and the next behavior decision sequence includes a next motion control parameter of a movable slide rail, the movable slide rail being located on a fixed rail of the underground pipe gallery; generating a next control instruction according to the next behavior decision sequence, wherein the next control instruction includes a next slide control instruction corresponding to the next motion control parameter; and sending the next slide control instruction to the movable slide rail where the at least one target fire extinguisher is located, wherein the next slide control instruction is used to control the movable slide rail where the at least one target fire extinguisher is located to slide along the fixed rail according to a next travel parameter indicated by the next motion control parameter, so as to drive the at least one target fire extinguisher to slide, so that the at least one target fire extinguisher extinguishes the fire at the fire point; wherein the at least one target fire extinguisher is determined from a plurality of fire extinguishers according to current fire extinguisher positions of the plurality of fire extinguishers, the current fire spread information and the current fire point position, and the plurality of fire extinguishers each have a movable slide rail located therein.

[0006] According to an embodiment of the present application, the next action decision sequence is determined according to the current fire spread information, the current fire information, the current fire extinguisher position of each of the at least one target fire extinguisher, and the current ignition point position of the ignition point, and comprises: processing the current state information by using a policy network of the agent to obtain the next action decision sequence, wherein the current state information is determined according to the current fire spread information, the current fire information, the current fire extinguisher position of each of the at least one target fire extinguisher, and the current ignition point position of the ignition point.

[0007] According to an embodiment of the present application, the current state information comprises the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, the current driving parameter of the movable slide rail, the current fire spread information, the current fire information, the current fire danger situation information, the next fire spread trend, the next fire change trend, and the next fire danger situation change trend, wherein the next fire spread trend indicates a change trend of the current fire spread information, the next fire change trend indicates a change trend of the current fire information, and the next fire danger situation change trend indicates a change trend of the current fire danger situation information, and the current fire danger situation information is used to determine a fire extinguishing priority; the current driving parameter is determined according to a current fire spread speed included in the current fire spread information, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, a current temperature distribution included in the current fire information, and a start-up delay of the target fire extinguisher; and the current fire danger situation information is determined according to the current fire spread information, the current fire information, and a configuration risk level of the underground pipe gallery.

[0008] According to an embodiment of the present application, the next fire spread trend, the next fire change trend, and the next fire danger situation change trend are determined according to the current other environment information, the current fire information, and the current fire danger situation information, wherein the current other environment information indicates environment information that is synchronized with the current temperature distribution information included in the current fire information in a time dimension.

[0009] According to an embodiment of the present application, the next fire spread trend, the next fire change trend, and the next fire danger situation change trend are obtained by decoding an intermediate feature vector, the intermediate feature vector is obtained by processing a fusion feature vector by using a self-attention strategy, the fusion feature vector is obtained according to the current other environment information, the current fire information, and the current fire danger situation information, and the intermediate feature vector indicates high-level semantic features carrying global context information.

[0010] According to an embodiment of the present application, the current fire spreading parameter is determined according to at least one of a first current fire spreading parameter or a second current fire spreading parameter, the first current fire spreading parameter is obtained by processing the current fire spreading speed included in the current fire spreading information, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, the current temperature distribution included in the current fire information, and the activation delay of the target fire extinguisher by using a first fire spreading parameter prediction model, wherein the first fire spreading parameter prediction model is a conventional physical model; the second current fire spreading parameter is obtained by processing at least one of the current fire spreading speed included in the current fire spreading information, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, the current temperature distribution included in the current fire information, or the activation delay of the target fire extinguisher by using a second fire spreading parameter prediction model, wherein the second fire spreading parameter prediction model is a deep learning time series model; and / or the current fire risk situation information includes at least one of the current fire source intensity or the current fire risk level, the current fire source intensity is determined according to the current fire information, the current fire source intensity indicates the energy release rate of the current fire source and the spatial decay rate of the thermal influence of the current fire source, and the current fire risk level is determined according to the current fire source intensity, the current fire spreading information, and the configuration risk level of the underground pipe gallery.

[0011] According to an embodiment of the present application, the next action decision sequence further includes at least one next execution control parameter of each of the at least one target fire extinguisher, and the next control instruction further includes a next execution control instruction corresponding to each of the at least one next execution control parameter; wherein the method further includes: sending, to the at least one target fire extinguisher, a next execution control instruction corresponding to each of the at least one target fire extinguisher, wherein the next execution control instruction is used to control the target fire extinguisher to extinguish the ignition point according to the next execution control parameter indicated by the next execution control instruction.

[0012] According to an embodiment of the present application, the nozzle of the target fire extinguisher is configured with a temperature-sensitive release device connected to an electric heat ignition device; wherein the method further includes: for any target fire extinguisher in the at least one target fire extinguisher, in response to satisfying the working condition of the electric heat ignition device of the target fire extinguisher, sending an electric heat ignition control instruction to the target fire extinguisher, wherein the electric heat ignition control instruction is used to drive the electric heat ignition device of the target fire extinguisher to generate heat for heating the temperature-sensitive release device, so that the temperature-sensitive release device ruptures in response to the detected temperature being greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the fire extinguishing agent.

[0013] The embodiment of the present application provides a kind of underground pipe gallery fire extinguishing system, comprising: fixed track;Multiple movable slide rails located in fixed track;Multiple fire extinguishers, any fire extinguisher in multiple fire extinguishers has movable slide rail located;Controller, for: according to current fire spread information, current fire information, the current fire extinguisher position of at least one target fire extinguisher respectively, and the current fire point position of fire point, determine next behavior decision sequence, wherein, current fire spread information indicates current fire spread range and current fire spread speed, current fire information indicates at least one of physical energy state or evolution intensity of current fire, at least one target fire extinguisher is determined from multiple fire extinguishers according to the current fire extinguisher position of multiple fire extinguishers respectively, current fire spread information and current fire point position;According to next behavior decision sequence, generate next control instruction, wherein, next control instruction includes next slide control instruction corresponding to next motion control parameter;Next slide control instruction is sent to movable slide rail where at least one target fire extinguisher is located respectively;Movable slide rail where at least one target fire extinguisher is located respectively, for under the control of next slide control instruction, according to the next travel parameter indicated by next motion control parameter along fixed track sliding, to drive at least one target fire extinguisher to slide;At least one target fire extinguisher, for extinguishing fire point.

[0014] According to the embodiment of the present application, the distance between the adjacent two fire extinguishers located in the same movable slide rail is determined according to the configuration risk level of the area to which the movable slide rail belongs;And / or fire extinguisher, comprising: at least two fire bottles, at least two fire bottles each have corresponding spray passage and load corresponding type of fire extinguishing agent, different fire bottles carry different types of fire extinguishing agent;And / or controller is deployed in edge device;And / or target fire extinguisher, comprising: nozzle;Mechanical ignition device, located in nozzle, mechanical ignition device includes temperature sensing release device, temperature sensing release device is used to break in response to detected temperature greater than or equal to preset temperature threshold, so as to trigger nozzle to release fire extinguishing agent;Electric ignition device, located in nozzle and connected with temperature sensing release device, electric ignition device is used to heat the heat of temperature sensing release device in response to electric heat ignition control instruction from controller, so that temperature sensing release device breaks in response to detected temperature greater than or equal to preset temperature threshold, so as to trigger nozzle to release fire extinguishing agent, wherein, electric heat ignition control instruction is generated by controller in response to meeting the working condition of electric heat ignition device of target fire extinguisher.

[0015] According to the embodiment of the present application, by determining the running parameters of the movable slide rails according to the fire spreading range and speed, the number of fire extinguishers or the amount of fire extinguishing agent in the fire area can adapt to the dynamic changes of the fire, and in the case of accelerating fire spreading speed or expanding fire spreading range, the position and movement state of the fire extinguishers can be adjusted in time to reach the fire area for extinguishing. At the same time, not only the fire point can be extinguished, but also the area around the fire point that may be burning or has been burning can be extinguished according to the fire spreading speed and range, so as to expand the extinguishing range, inhibit the development of the fire before the fire spreads to a larger range, reduce the range and speed of the fire spreading, and further reduce the damage of the fire to the facilities such as cables and pipelines in the underground pipe gallery, and reduce the property loss. Moreover, since the fire extinguishers do not need to be densely arranged, the equipment procurement and maintenance costs, and the daily operation and maintenance difficulty are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic diagram of an underground pipe gallery fire extinguishing system according to an embodiment of the present application is shown.

[0017] Figure 2 A layout schematic diagram of fire extinguishers in an underground pipe gallery fire extinguishing system according to an embodiment of the present application is shown.

[0018] Figure 3 A structure schematic diagram of a target fire extinguisher according to an embodiment of the present application is shown.

[0019] Figure 4 A flowchart of an underground pipe gallery fire extinguishing method according to an embodiment of the present application is shown.

[0020] Figure 5 A structure schematic diagram of an underground pipe gallery fire extinguishing method according to an embodiment of the present application is shown.

[0021] Figure 6(a) shows a fire extinguishing effect diagram of a conventional fire extinguishing method at the 30th second of fire.

[0022] Figure 6(b) shows a fire extinguishing effect diagram according to an embodiment of the present application at the 30th second of fire.

[0023] Figure 7(a) shows a fire extinguishing effect diagram of a conventional fire extinguishing method at the 60th second of fire.

[0024] Figure 7(b) shows a fire extinguishing effect diagram according to an embodiment of the present application at the 60th second of fire.

[0025] Figure 8(a) shows a fire extinguishing effect diagram of a conventional fire extinguishing method at the 90th second of fire.

[0026] Figure 8(b) shows a fire extinguishing effect diagram according to an embodiment of the present application at the 90th second of fire. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Terms such as include, comprise, etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.

[0029] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0030] In the long and narrow spatial structure of utility tunnels, large fire-fighting blind spots can easily form in the middle or corners. Once a fire occurs, such as a cable fire or a gas leak, the fire can spread rapidly along the axis of the tunnel. The fire extinguisher closest to the fire may be too far away to respond in time, missing the golden window for initial fire suppression, which in turn leads to the spread and expansion of the fire, increasing the difficulty of subsequent firefighting. As a result, the fire-fighting efficiency and effectiveness are relatively low.

[0031] If dense deployment of fire extinguishers is chosen to eliminate coverage blind spots and improve response speed, while this allows the spacing between fire extinguishers to match the narrow structure of the utility tunnel and reduces fire-fighting dead zones in the middle or at corners, it would require installing a massive number of fire extinguishing devices along the tunnel for several kilometers or even tens of kilometers. The equipment procurement and maintenance costs are high, and the limited space inside the utility tunnel means that the densely packed fire extinguishers would obstruct maintenance access, affecting inspection operations and potentially increasing safety hazards and operational difficulties in the daily operation and maintenance of the tunnel.

[0032] Figure 1 A schematic diagram of an underground utility tunnel fire extinguishing system according to an embodiment of the present invention is shown.

[0033] like Figure 1 As shown, the underground utility tunnel fire extinguishing system includes: a fixed track 110; multiple movable slide rails 120 located on the fixed track 110; and multiple fire extinguishers 130, including... Figure 1The fire extinguishers A 130A, B 130B, C 130C and A' 130A' are shown in the middle. Any of the plurality of fire extinguishers 130 has a movable slide rail 120 located therein; a controller (not shown in the figure) is configured to: determine a next behavior decision sequence according to current fire spread information, current fire information, current fire extinguisher positions of at least one target fire extinguisher, and a current fire point position of the fire point, wherein the current fire spread information indicates a current fire spread range and a current fire spread speed, the current fire information indicates at least one of a physical energy state or an evolution intensity of the current fire, and the at least one target fire extinguisher is determined from the plurality of fire extinguishers according to the current fire extinguisher positions of the plurality of fire extinguishers, the current fire spread information and the current fire point position; generate a next control instruction according to the next behavior decision sequence, wherein the next control instruction includes a next slide control instruction corresponding to a next motion control parameter; send the next slide control instruction to the movable slide rail 120 where the at least one target fire extinguisher is located; and the movable slide rail 120 where the at least one target fire extinguisher is located is configured to slide along the fixed rail 110 according to a next travel parameter indicated by the next motion control parameter under control of the next slide control instruction, to drive the at least one target fire extinguisher to slide; and the at least one target fire extinguisher is configured to extinguish the fire point.

[0034] The fixed rail 110 is a rail structure pre-fixed and installed in the underground pipe gallery, and is a basic bearing and guiding component of the entire fire extinguishing system, providing a stable running path for the movable slide rail 120. As the track base of the movable slide rail 120, it defines the sliding range and direction of the movable slide rail 120, so that the movable slide rail 120 and the fire extinguishers carried thereby can move stably along the preset route, providing a spatial path basis for subsequent fire extinguishing.

[0035] A plurality of movable slide rails are slidably installed on the fixed rail. Each movable slide rail 120 carries at least one fire extinguisher thereon and can drive the fire extinguisher to move on the fixed rail. The plurality of movable slide rails serve as mobile carriers of the fire extinguishers, connecting the fixed rail and the fire extinguishers, and by sliding along the fixed rail, they drive the fire extinguishers to change positions, achieving position adjustment of the fire extinguishers in a larger range and providing a moving ability for approaching the fire point. As shown in Figure 1 Each movable slide rail 120 is an independent ring-shaped slide rail. The movable slide rail can also be a straight pipe-shaped slide rail along the direction of the underground pipe gallery, etc. The layout shape of the slide rail is not described here.

[0036] Exemplarily, the pipe gallery is 500 m long, 5 m wide, and 3 m high, the maintenance opening interval is 50 m, and there are 10 maintenance openings in total. One near-end controller is arranged at each maintenance opening and communicates with the fire extinguishers and the movable slide rails through Bluetooth. An annular slide rail is arranged along the top of the pipe gallery, and each 50 m is divided into an independent annular slide rail unit, and there are 10 units in total. The total length of each movable slide rail is 50*2+5*2=110 m, which can be independently controlled and maintained so as to be selectively enabled or disabled according to the fire situation. The movable slide rail is made of high-strength hot-dip galvanized carbon steel, which takes into account the load bearing capacity and corrosion resistance to ensure the stability of long-distance continuous operation. The moving platform adopts a motor-driven sliding block structure, and a built-in encoder is used to realize ±5 mm precision positioning. The sliding block contact surface is covered with a nylon gasket to ensure smooth operation and prolong the service life of the track.

[0037] As shown in Figure 1 , the fixed track 110 is arranged along the top of the underground pipe gallery, and an annular closed movable slide rail 120 is arranged at a certain distance interval on the fixed track 110, which is convenient for installation, maintenance, and regional independent control.

[0038] Among them, the length of each movable slide rail can be set according to the actual working condition and historical experience. Specifically, the length of each movable slide rail can be different or the same. For example, the length of the movable slide rail . Among them, k is a coefficient for determining the length of the movable slide rail according to the common size of the underground pipe gallery, which is selected according to the common size of the underground pipe gallery. The specific value of k is shown in Table 1.

[0039] Table 1 Common size of underground pipe gallery and k value comparison table

[0040]

[0041] Among them, the standard unit length of the medium-sized pipe gallery corresponds to =1. Due to the narrow width of the small-sized pipe gallery, the unit length is appropriately lengthened to reduce the number of bottle groups and installation nodes. The large-sized pipe gallery is spacious and high, and the unit length is appropriately shortened to ensure uniform coverage of the fire extinguishing agent during the movement of the slide rail.

[0042] The fixed track and the movable slide rail can be made of high-strength hot-dip galvanized carbon steel, which takes into account the load bearing capacity and corrosion resistance to support long-distance continuous operation. The fixed track and the movable slide rail adopt a motor-driven sliding block structure, which can realize automatic start and stop and precise position control. The sliding block contact surface is covered with a nylon gasket to ensure smooth operation and prolong the service life of the track.

[0043] A plurality of fire extinguishers, any one of the plurality of fire extinguishers has a movable slide rail 120 located on. Each fire extinguisher is carried on the corresponding movable slide rail, as shown in Figure 1As shown, the fire extinguishers A 130A, B 130B, and C 130C are configured on the left movable slide rail Figure 1 As shown, the fire extinguisher A' 130A' is configured on the left movable slide rail Figure 1 As shown, the fire extinguisher A' 130A' is configured on the left movable slide rail

[0044] a controller configured to determine a next behavior decision sequence according to current fire spread information, current fire information, current fire extinguisher positions of the at least one target fire extinguisher, and a current fire point position of the fire point, wherein the current fire spread information indicates a current fire spread range and a current fire spread speed, the current fire information indicates at least one of a physical energy state or an evolution intensity of the current fire, and the at least one target fire extinguisher is determined from a plurality of fire extinguishers according to the current fire extinguisher positions of the plurality of fire extinguishers, the current fire spread information, and the current fire point position; generate a next control instruction according to the next behavior decision sequence, wherein the next control instruction includes a next slide control instruction corresponding to a next motion control parameter; send the next slide control instruction to the movable slide rail on which the at least one target fire extinguisher is located; and the movable slide rail on which the at least one target fire extinguisher is located is configured to slide along the fixed track according to a next travel parameter indicated by the next motion control parameter under control of the next slide control instruction, to drive the at least one target fire extinguisher to slide; and the at least one target fire extinguisher is configured to extinguish the fire at the fire point.

[0045] The movable slide rail 120 is a moving carrier for each fire extinguisher 130, fixed on the fixed track 110 of the underground pipe gallery, and can drive the fire extinguisher to slide along the fixed track 110. As shown in Figure 1 The fixed track 110 is a preset and immovable track in the pipe gallery, usually laid along the length direction of the pipe gallery. The bottom of the movable slide rail is provided with a clamping groove or a roller matched with the fixed track 110, which can be clamped on the fixed track 110, so that the slide rail does not deviate or derail during sliding. The top is used to fix the fire extinguisher, such as locking the fire extinguisher on the slide rail by bolts or buckles. The inside is integrated with a driving device and a braking device, which can drive the fire extinguisher to slide along the fixed track 110 at a specified speed and direction according to the next control instruction, and stop at the target position. The movable slide rail also has a positioning module and a communication module, which can feedback the position of the movable slide rail to the controller, and receive the next control instruction sent by the controller.

[0046] In the complex environment of narrow underground pipe gallery, many obstacles, and strong electromagnetic interference, the fixed track provides a stable running path for the movable slide rail. The movable slide rail is fixedly connected with multiple fire extinguishers, which can realize cooperative fire extinguishing for the fire point or large-scale fire, and improve the limitation of single fire extinguishing device single-point coverage. Further, the controller dynamically determines the next motion control parameter of the movable slide rail, which improves the matching degree of the target fire extinguisher and the fire development rhythm. The movable slide rail drives the fire extinguisher to move along the fixed track, combined with the injection control of the fire extinguisher itself, to realize dynamic tracking and coverage of the fire point and fire spread, so as to improve the fire extinguishing efficiency, prevent the fire from spreading to an uncontrollable situation, and reduce the fire recurrence rate.

[0047] The underground pipe gallery fire extinguishing system can also include a temperature detection device. Distributed optical fiber sensing technology is used to lay temperature sensing optical fibers in the middle of the top of the underground pipe gallery, the middle of the two side walls, and high-risk areas (such as cable pipelines along the line). Through the Raman scattering effect of the light signal in the optical fiber, the temperature change of the position where the optical fiber is located is reflected, and continuous temperature collection and fire source positioning are realized under 1m resolution. The optical fiber system has a collection frequency of 5s / period, a temperature measurement accuracy of ±1°C, and can cover the entire length of the pipe gallery and monitor temperature changes in real time. When the temperature or temperature change rate of a certain area exceeds the preset threshold (such as temperature rising more than 5°C / min or temperature reaching the set alarm threshold), or the continuous temperature rise exceeds the set time limit, the system immediately triggers an alarm and uploads the temperature field distribution information such as fire point coordinates to the central control unit for subsequent analysis and fire extinguishing decision. Thus, real-time, continuous, and high-precision monitoring of temperature distribution changes can be achieved in the underground pipe gallery. Once temperature anomalies are found, heat anomaly positioning coordinates are formed and temperature field distribution information is uploaded to the control unit as a basis for fire extinguishing deployment.

[0048] As shown in Figure 1 The underground pipe gallery fire extinguishing system can also include multiple proximal communication nodes 140, wherein each of the multiple proximal communication nodes 140 is located at a corresponding access hole, the access hole is configured between two movable slide rails, and any one of the multiple proximal communication nodes 140 is in communication connection with the controller, for: sending the current fire extinguisher position of each target fire extinguisher and the current fire information to the controller; receiving the next motion control parameter from the controller; and sending the next sliding control instruction to the movable slide rail where each target fire extinguisher is located.

[0049] The near-end communication node 140 is arranged between each maintenance opening or movable slide rail 120, and works in a range of about tens of meters by using a low-power wireless mode such as a Bluetooth mesh network (Bluetooth Mesh, referred to as Bluetooth Mesh for short) to directly receive local control data packets, such as start acceleration, uniform speed rate, bottle group opening and closing and spraying mode, and complete immediate instruction distribution, state collection and local closed-loop control of the slide rail platform, electric heating ignition device, pressure / position sensor and other equipment; when the upper link is abnormal, autonomous execution of fire extinguishing can be performed according to the last caching strategy.

[0050] As shown in Figure 1 , the underground pipe gallery fire extinguishing system can also include a remote communication node 150, which is in communication connection with a remote server, for receiving remote instructions sent from the remote server, sending operation state information of the underground pipe gallery fire extinguishing system to the remote server, and sending fire extinguishing operation information.

[0051] The remote communication node 150 uses optical fiber as the main link and general packet radio service (General Packet Radio Service, GPRS) as the backup link to realize multi-section data aggregation and reporting, uniformly issue cross-section scheduling and emergency linkage instructions, and interface with the city fire fighting, smoke exhaust and security platform; when the main link fails, it automatically switches to the backup link to ensure the continuity of global monitoring and remote scheduling.

[0052] Thus, the near-end communication node locally and in real time executes and directly controls the equipment, the remote communication node globally monitors, uniformly schedules and multi-system links, and the two together constitute a hierarchical, redundant and robust communication control system.

[0053] Figure 2 A layout schematic diagram of the fire extinguisher and the movable slide rail according to an embodiment of the present application is shown.

[0054] As shown in Figure 1 and Figure 2 , the distance between the two adjacent fire extinguishers located in the same movable slide rail is determined according to the configuration risk level of the area to which the movable slide rail belongs.

[0055] The plurality of fire extinguishers 130 are each fixedly installed on the corresponding movable slide rail 120, wherein the installation distance between any two fire extinguishers is determined by the configuration risk level of the underground pipe gallery. One fire extinguisher 130 is arranged on each movable slide rail 120 at a certain distance interval. The distance between the two fire extinguishers can be different. Or the distance between the two fire extinguishers can also be the same, as shown in Figure 2 , the distance between the two fire extinguishers is H1.

[0056] Preferably, the distance between two fire extinguishers is determined based on the risk level of the underground utility tunnel configuration. During the initial deployment phase, a risk assessment is conducted on the fire probability and severity of fire consequences in each area, taking into account the structure, pipeline types, load density, and ventilation conditions of the underground utility tunnel, combined with historical data and fire incident statistics.

[0057] High-risk areas are designated as sections with dense cable traffic, main power lines, and areas where oil and gas pipelines intersect; communication, water, or ventilation corridors are designated as ordinary-risk areas; and equipment maintenance areas, empty sections, or edge areas are designated as low-risk areas. For example, in high-risk areas, a set of composite fire extinguishing agent cylinders is placed every 10 meters; in ordinary-risk areas, a set of composite fire extinguishing agent cylinders is placed every 12 meters; and in low-risk areas, a set of two-cylinder fire extinguishing agent cylinders is placed every 14 meters. This tiered arrangement ensures rapid fire suppression in high-risk areas while balancing economy and coverage needs in low-risk areas, achieving efficient and balanced fire suppression throughout the entire utility tunnel.

[0058] For example, distributed fiber optic temperature sensors are deployed in high-risk areas such as the top sides, centerline, and middle sections of the side walls of the utility tunnel, as well as along cable ducts. These sensors have a spatial resolution of 1m, a sampling frequency of 5s / cycle, and a temperature measurement accuracy of ±1℃. Figure 2 As shown, taking a movable slide rail as an example, the vertical projection of the center points of fire extinguishers 130-1, 5130-5, and 6130-6 in the middle section onto the ground position shows that a cable pipeline catches fire 2.5m away from one side of the pipe gallery. The fire source area at the ignition point is 1m², and the fire source power is 5MW. The movable sliding rail is located in the high-risk area of ​​the utility tunnel. A group of composite fire extinguishing agent cylinders is placed every 10 meters. After reducing the length due to the chamfering of the circular track and the width of the track itself, a total of 10 groups of fire extinguishing agent cylinders are arranged within the remaining length of the circular sliding rail. They are numbered sequentially as follows: Fire Extinguisher 130-1, Fire Extinguisher 230-2, Fire Extinguisher 330-3, Fire Extinguisher 430-4, Fire Extinguisher 5130-5, Fire Extinguisher 6130-6, Fire Extinguisher 7130-7, Fire Extinguisher 8130-8, Fire Extinguisher 9130-9, and Fire Extinguisher 10130-10. A three-dimensional coordinate system is established for the underground utility tunnel: the origin (0,0,0) is the ground corner where the walls on both sides of the tunnel entrance meet. The X-axis extends longitudinally along the length of the tunnel, the Y-axis extends laterally along the width of the tunnel, and the Z-axis extends vertically along the height of the tunnel. The system monitors temperature data in real time and generates the coordinates of the ignition point (X=225m, Y=2.5m, Z=0m), which is then uploaded to the controller.

[0059] Specifically, a fire extinguisher includes at least two fire extinguishing cylinders, each with a corresponding spray path and loaded with a corresponding type of extinguishing agent. Different fire extinguishing cylinders carry different types of extinguishing agents.

[0060] Figure 3A structural schematic diagram of a target fire extinguisher according to an embodiment of the present application is shown.

[0061] As shown in Figure 3 each target fire extinguisher can be a fire extinguisher bottle group, each group of fire extinguishers adopts a double-bottle integrated arrangement, that is, including a first fire bottle and a second fire bottle. The first fire bottle can be a fire bottle, and the second fire bottle can be a dry powder fire bottle. For example, the first fire bottle is a 10KG fire bottle, and the second fire bottle is a 12KG ABC dry powder fire bottle.

[0062] The first fire bottle and the second fire bottle are independently stored and independently controlled, and are connected to independent injection channels through a parallel valve control unit. The bottle group is installed in a pressure-resistant protective cabin, which has shockproof, corrosion-resistant and temperature and pressure stable functions, and is suitable for complex underground environments. Each group of bottles is provided with a pressure detection device, an injection feedback module and coded information, which can upload the pressure storage state and the injection state in real time. The module has a fire self-adaptive capability, automatically selects the optimal injection mode combined with the fire source identification result, and can realize continuous projection coverage along the track area combined with the nozzle design and the moving platform track, thereby improving the one-time fire extinguishing success rate and avoiding the rekindling of residual fire.

[0063] The first fire bottle and the second fire bottle are repeatedly rechargeable and recyclable structures, each group of bottles is provided with a pressure detection device, an injection feedback module and coded information, which can feedback the pressure storage state and the injection state to the controller in real time. After each fire extinguishing is completed, the injection state can be remotely identified and marked for replacement of the bottle group, thereby reducing the operating cost and the maintenance frequency. The specific parameters of the fire bottle are shown in Table 2.

[0064] Table 2: Fire bottle type and parameter reference table

[0065]

[0066] The first fire bottle or the second fire bottle includes a nozzle, a mechanical ignition device and an electric ignition device.

[0067] The mechanical ignition device is located at the nozzle, and the mechanical ignition device includes a temperature-sensitive release device, which is used to break in response to a detected temperature greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the fire extinguishing agent.

[0068] The electric ignition device is located at the nozzle and connected with the temperature-sensitive release device, and the electric ignition device is used to heat the temperature-sensitive release device in response to an electric heat ignition control instruction from the controller, so that the temperature-sensitive release device breaks in response to a detected temperature greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the fire extinguishing agent, wherein the electric heat ignition control instruction is generated by the controller in response to the working conditions of the electric heat ignition device of the target fire extinguisher being met.

[0069] Exemplarily, in the normal communication and power supply state, the electric heating ignition device is controlled by the controller to issue a digital pulse signal, and is driven by 24V direct current. When the electric heating ignition device receives the spraying instruction, the electric heating wire or the micro electric heating film rapidly heats up to 600-800℃ within 0.5-1s, so that the glass ball is rapidly heated to reach its breaking temperature of 93℃, thereby triggering the nozzle to release the fire extinguishing agent. This path has the advantages of rapid response and high control precision, and can realize precise and combined fire extinguishing strategies. If abnormality such as main power failure, communication interruption, controller crash occurs, the glass ball does not need to rely on electric control heating, but through the continuous rise of the fire field environment temperature, when the temperature exceeds the breaking threshold of 93℃, the glass ball naturally breaks under the action of internal pressure and thermal stress, and automatically opens the nozzle to release the fire extinguishing agent.

[0070] Figure 4 A flowchart of the underground pipe gallery fire extinguishing method according to an embodiment of the application is shown.

[0071] Figure 5 A structural schematic diagram of the underground pipe gallery fire extinguishing method according to an embodiment of the application is shown. The following will be explained in detail in combination with Figure 4 and Figure 5 .

[0072] As shown in Figure 4 , the underground pipe gallery fire extinguishing method includes operation S410-operation S430.

[0073] In operation S410, according to the current fire spread information, the current fire information, the current fire extinguisher position of each target fire extinguisher, and the current ignition point position of the ignition point, a next behavior decision sequence is determined, wherein the current fire spread information indicates the current fire spread range and the current fire spread speed, the current fire information indicates at least one of the physical energy state or the evolution intensity of the current fire, and the next behavior decision sequence includes a next motion control parameter of a movable slide rail, and the movable slide rail is located on a fixed rail of the underground pipe gallery.

[0074] In operation S420, according to the next behavior decision sequence, a next control instruction is generated, wherein the next control instruction includes the next behavior decision sequence corresponding to the next motion control parameter.

[0075] In operation S430, a next behavior decision sequence is sent to the movable slide rail where each of the at least one target fire extinguisher is located, wherein the next behavior decision sequence is used to control the movable slide rail where each of the at least one target fire extinguisher is located to slide along the fixed track according to the next movement control parameter indicated by the next running parameter, so as to drive the at least one target fire extinguisher to slide, so that the at least one target fire extinguisher extinguishes the fire point; wherein the at least one target fire extinguisher is determined from a plurality of fire extinguishers according to the current fire extinguisher position, the current fire spread information and the current fire point position of each of the plurality of fire extinguishers, and each of the plurality of fire extinguishers has a movable slide rail located therein.

[0076] The current fire spread information is used to indicate the diffusion state of the fire, including how large the current fire has spread, i.e. the current fire spread range, and how fast the fire spreads, i.e. the current fire spread speed. The current fire information refers to the actual monitoring data of the fire field, and the current fire information can include the physical energy state and the evolution intensity of the current fire. The physical energy state can include temperature peak value and temperature distribution information; the evolution intensity can include temperature rise rate and burning rate information. The current position of the target fire extinguisher refers to the specific position in the pipe gallery, such as coordinates (x, y, z) );The current position of the fire point refers to the center point position of the fire source, such as coordinates (x, y, z) .

[0077] The next behavior decision sequence includes the next movement control parameter of the movable slide rail, such as the target position, running speed and acceleration of the next step of the slide rail, and the at least one target fire extinguisher is determined in advance from all fire extinguishers in the pipe gallery, for example, the fire extinguisher closest to the fire point and capable of responding to the fire spread the fastest is selected, and each target fire extinguisher is provided with a movable slide rail.

[0078] The next movement control parameter is the running parameter for controlling the sliding of the movable slide rail under the condition of determining the current fire spread information, including the acceleration of starting the movable slide rail, the running speed of uniform running after starting, and the running direction.

[0079] The next movement control parameter generated according to the actual diffusion of the fire needs to make the target fire extinguisher reach the effective fire extinguishing position before the fire spreads, so as to extinguish the fire in the minimum time range without wasting time, and also avoid the slide rail out of control due to too high speed.

[0080] The generated next action decision sequence is sent to each target fire extinguisher corresponding movable slide rail, such as fire extinguisher A 130A, fire extinguisher B 130B, fire extinguisher C 130C corresponding slide rail 1, fire extinguisher A' 130A' corresponding slide rail 2, etc. The control slide rail slides along the fixed track in the pipe gallery according to the requirements of the next motion control parameter, and then drives the target fire extinguisher on the slide rail to move. After all the target fire extinguishers are moved by the slide rail, they can accurately aim at the fire point and carry out fire extinguishing operation, such as moving to the front of the fire source and aiming at the root of the flame to spray fire extinguishing agent.

[0081] Considering the dynamic change characteristics of fire spread in the underground pipe gallery, that is, it may spread rapidly to both sides of the pipe gallery in a short time, forming a multi-directional fire spread situation. Or due to the difference in flammable material characteristics in different cabins in the pipe gallery, the fire may spread in a leapfrog manner, and the high-temperature smoke layer may accumulate rapidly. Obviously, the response in the related art to the fire after ignition cannot meet the timeliness and accuracy requirements of fire spread and control. After the underground pipe gallery is on fire and presents a complex fire spread situation, the post-fire extinguishing method has a lag, which makes it difficult to control the fire spread.

[0082] As shown in Figure 5 , the next sliding control instruction is sent by the controller to the movable slide rail for controlling the opening and sliding of the movable slide rail, such as "XX time start, slide to A section 25 meters direction at 8 meters / minute speed". Among them, the next control instruction can instruct the movable slide rail to slide according to the next motion control parameter, and update the target fire extinguisher during the sliding process until all the fire is extinguished. As shown in Figure 2 , according to the fire point information, the target fire extinguisher is determined as fire extinguisher one 130-1, fire extinguisher five 130-5, and fire extinguisher six 130-6. As the movable slide rail slides, when fire extinguisher one 130-1 moves away from the fire point and fire extinguisher ten 130-10 approaches the fire point, fire extinguisher ten 130-10 is determined as the target fire extinguisher again. Thus, during the fire extinguishing process, the movable slide rail can keep rotating without stopping until all the fire is extinguished.

[0083] The traditional fixed fire extinguishing device can only cover the preset area and cannot be adjusted dynamically according to the fire; the single distance dimension screening may ignore the blockage of the fire spread to the path, such as the near distance fire extinguisher is surrounded by the fire and cannot safely arrive.

[0084] By determining the running parameters of the movable slide according to the current fire spread range and speed, the number or amount of fire extinguishers in the fire area can adapt to the dynamic changes of the fire, and in the case of accelerated fire spread speed or expanded fire spread range, the position and movement state of the fire extinguisher can be adjusted in time to reach the fire area for extinguishing. At the same time, not only the fire point can be extinguished, but also the area around the fire point that may be burning or has been burning can be extinguished according to the spread speed and range of the fire, so as to expand the extinguishing range, inhibit the development of the fire before it spreads to a larger range, reduce the range and speed of the fire spread, and further reduce the damage of the fire to the facilities such as cables and pipelines in the underground pipe gallery, and reduce the property loss. Moreover, since it is not necessary to densely arrange fire extinguishers, the equipment procurement and maintenance costs, as well as the daily operation and maintenance difficulty, are reduced.

[0085] The determination of the next motion control parameter should also consider the effective release of the fire extinguisher in the fire extinguishing area.

[0086] On the one hand, accurate control of the speed should avoid waste of the fire extinguishing agent due to too fast speed. If the slide runs too fast, the residence time of the fire extinguisher in the fire extinguishing area will be shorter than the effective injection time, and it may only release part of the fire extinguishing agent before sliding out of the fire extinguishing range, causing the fire extinguishing agent to be idle without being fully utilized. By updating the next motion control parameter in real time according to the current fire spread information, the fire extinguisher has sufficient time to complete the release of the fire extinguishing agent in the area, the effective action time of a single fire extinguisher is improved, and the resource utilization rate is further improved. When the fire spread speed changes dynamically, the next motion control parameter can be adjusted synchronously, so that the fire extinguisher is always within the effective fire extinguishing coverage range.

[0087] For example, the fire extinguishing area is at 20-30 meters of pipe gallery A section (length 10 meters), and if the uniform speed of the slide is set to 20 meters / minute, the residence time of the fire extinguisher in the area is only 30 seconds. While the type of fire extinguisher needs 45 seconds to complete an effective injection, the too fast speed will cause the fire extinguishing agent to be released only 67% before leaving the area, which cannot completely cover the fire point, causing incomplete extinguishing and the risk of fire recurrence.

[0088] On the other hand, accurate control of the speed should avoid fire extinguishing interruption due to too slow speed. The storage capacity of a single fire extinguisher is limited, and there is a fixed injection time. If the running speed of the slide of the subsequent target fire extinguisher is too slow, it will cause the fire extinguisher to run out of the fire extinguishing agent when it reaches the fire extinguishing area, forming a gap period. By updating the next motion control parameter in real time according to the current fire spread information, the subsequent device can reach the fire scene before the fire extinguisher of the previous device runs out of the fire extinguishing agent, seamlessly connecting the fire extinguishing operation, avoiding missing the best fire extinguishing opportunity due to the gap, especially in the controllable stage of the initial stage of the fire, and maximizing the reduction of the risk of fire expansion.

[0089] For example, the pre-sequenced fire extinguisher is located at 25 meters of section A (within the fire extinguishing area) and starts spraying at 00:01, and the extinguishing agent is exhausted at 00:02:30 (90 seconds later); the subsequent cooperative target fire extinguisher is initially located at 40 meters of section A, and if the uniform sliding rail travel speed is only 5 meters / minute, it takes 3 minutes to reach the fire extinguishing area, and will arrive at 00:04, and there will be a 1 minute and 30 seconds fire extinguishing interruption period, and the fire may break through the control range and spread to other areas of the pipe gallery during this period.

[0090] The predetermined time range is a time boundary for "controlling the action of the fire extinguisher or the sliding rail", so that the action execution can match the fire spread rhythm and avoid missing the best fire extinguishing opportunity. The predetermined time range is the longest time length during which the fire is still in a controllable state based on the current fire spread information through model prediction. For example, if the current fire spreads at a speed of 1 meter / minute, and there is a cable cabin 10 meters away in the pipe gallery, the predetermined time range can be set to "8 minutes in the future", which means that if the sliding rail can be started and the fire extinguisher can be reached within 8 minutes, the fire can still be controlled before the fire breaks through the safety boundary; if more than 8 minutes, the fire may spread to the cable cabin, and the fire extinguishing difficulty is greatly increased.

[0091] Based on the above time window, one embodiment is that the sliding rail needs to be started before the "start of the predetermined time range". The sliding rail needs time (response time) from starting to driving the fire extinguisher to reach the target position, so the sliding rail needs to be started before the start of the predetermined time range, so that the subsequent "arrival of the fire extinguisher" can fall within the time window. Exemplarily, the predetermined time range is "00:01-00:09" (a total of 8 minutes), and the sliding rail needs 6 minutes to drive the fire extinguisher to arrive, so the sliding rail needs to be started before 00:01 (such as 00:00) to make the fire extinguisher arrive at 00:06, fall within the 8-minute window, and extinguish the fire in time.

[0092] Another embodiment is that the fire extinguisher needs to arrive before the "end of the predetermined time range". No matter when the sliding rail is started, it must finally ensure that the time when the fire extinguisher reaches the effective fire extinguishing position is not later than the end point of the predetermined time range, so as to avoid the fire breaking through the controllable range before the fire extinguisher arrives. For example, the predetermined time range ends at 00:09, if the sliding rail is started at 00:04, even if the sliding rail speed is increased to 8 meters / minute (needs 3 minutes to arrive), the arrival time of the fire extinguisher is 00:07, which is before the end point and meets the requirements; if the arrival time is 00:10, which exceeds the end point, the action is invalid, and other fire extinguishers with faster response need to be replaced.

[0093] The fire information collection and the matching of the historical fire field information in the fire dynamics database break through the limitation of the traditional method which only relies on the real-time monitoring data and is easy to be disturbed by local interference and lacks global trend. With the help of the pre-constructed fire dynamics database and the dynamic characteristic matching algorithm, the temperature distribution and the temperature rising rate and other information collected in real time can be accurately matched with the fire spread mode of the historical similar scene, so that the current fire spread information (including the spread range, the spread speed and the like) with high consistency with the actual fire development can be derived, the deviation of the fire judgment caused by the locality or the lag of the monitoring can be avoided, and the accuracy of the fire prediction can be greatly improved.

[0094] According to the current fire point position and the current fire extinguisher position of each of the plurality of fire extinguishers, a first distance between each of the plurality of fire extinguishers and the fire point is determined; and according to the first distance and the effective spraying radius of each of the plurality of fire extinguishers, a first target fire extinguisher serving as a target fire extinguisher is determined from the plurality of fire extinguishers.

[0095] According to the current fire point position and the current fire extinguisher position of each of the plurality of fire extinguishers, a first distance between each of the plurality of fire extinguishers and the fire point is determined; and according to the first distance and the effective spraying radius of each of the plurality of fire extinguishers, a first target fire extinguisher serving as a target fire extinguisher is determined from the plurality of fire extinguishers.

[0096] In a case where the effective spraying range of the first target fire extinguisher does not cover the fire spread range, a second distance between the other fire extinguishers and the boundary of the fire spread range is determined according to the boundary coordinates of the fire spread range and the real-time coordinates of the other fire extinguishers except the first target fire extinguisher; and a second target fire extinguisher serving as a target fire extinguisher is determined from the at least one other fire extinguisher according to the second distance and the effective spraying radius of each of the at least one other fire extinguisher.

[0097] Firstly, the first target fire extinguisher is determined based on the distance from the fire point and the effective spraying radius, so that the initial fire extinguishing effect can directly cover the fire point; when the fire spread range exceeds the spraying range of the first target fire extinguisher, the second target fire extinguisher is further determined according to the distance between the fire spread boundary and the other fire extinguishers and the spraying radius, so as to realize the supplementary coverage of the fire spread area. Thus, on the basis of the accurate fire extinguishing of the fire source core area, the fire extinguishing range can be dynamically expanded according to the fire spread, so that the fire extinguishing effect is fitted to the actual fire development, the pertinence and comprehensiveness of the fire extinguishing are improved, and the effective control of the fire in the initial and spread stages is improved.

[0098] One of the embodiments of determining the current fire spread information can be: determining the current fire spread information from the pre-constructed fire dynamics database according to the current fire information.

[0099] The historical fire field information can be called from the pre-constructed fire dynamics database, wherein the historical fire field data under different fire source types, positions, powers, and environmental conditions are stored in the fire dynamics database based on fire dynamics simulation technology. Further, the current fire information is compared and analyzed with the historical fire field information in the database through a dynamic feature matching algorithm to determine the target historical fire field information, i.e., the historical data most similar to the current fire field characteristics.

[0100] According to the historical fire spread information, such as the historical fire spread range, spread speed, and temperature rise trend, contained in the matched target historical fire field information, and in combination with the dynamic change of the current fire information, the current fire spread information, including the fire spread range and fire spread speed in a predetermined time range, is obtained, which provides a basis for subsequent fire extinguisher scheduling and determination of the next motion control parameter of the slide rail.

[0101] The fire dynamics database pre-stores the fire spread law under different fire source types and environmental conditions, and when the current fire information is input, the comparison and matching with the historical data can be quickly completed through an algorithm, without starting from zero simulation calculation each time a fire occurs, which significantly shortens the acquisition time of the fire spread information and realizes a second-level response. It is especially suitable for scenes such as underground pipe corridors where fires are prone to spread quickly, and it gains a key time window for subsequent fire extinguisher scheduling and determination of the next motion control parameter of the slide rail. Thus, the controller can clearly grasp the development trend of the fire, thereby formulating a more targeted fire extinguishing strategy: for example, reasonably setting the slide rail driving speed according to the fire spread speed to enable the fire extinguisher to arrive in time; accurately delineating the fire extinguishing area according to the fire spread range to avoid resource waste or insufficient coverage, and ultimately improving the overall fire extinguishing efficiency and reducing the loss caused by the fire.

[0102] According to the embodiments of the present application, the next behavior decision sequence is determined according to the current fire spread information, the current fire information, the current fire extinguisher positions of the at least one target fire extinguisher, and the current ignition point position of the ignition point, and the next behavior decision sequence is obtained by processing the current state information by using the policy network of the intelligent agent, wherein the current state information is determined according to the current fire spread information, the current fire information, the current fire extinguisher positions of the at least one target fire extinguisher, and the current ignition point position of the ignition point.

[0103] In this context, an intelligent agent refers to an algorithmic model with autonomous decision-making capabilities, such as an intelligent agent built based on reinforcement learning. The policy network is used to learn from a large amount of historical data and firefighting experience, and directly output action decisions based on the current scenario state. Current state information is the input to the policy network, representing a multi-dimensional integration of the current fire scenario and equipment status. Specifically, it can include: current fire spread information, i.e., the dynamic characteristics of fire spread, such as the spread range and speed; current fire intensity information, i.e., the intensity characteristics of the fire source, such as peak temperature, flame size, and burning rate; the current location of the target fire extinguisher; and the current location of the ignition point.

[0104] After receiving the current state information, the policy network analyzes the input state information based on the fire extinguishing strategy logic learned during training. The output next line is a decision sequence, which specifies the next step for the fire extinguishing equipment. For example, if the current state shows the fire point coordinates as (50,0), the target fire extinguisher is located at (30,0), and the fire is spreading eastward at 0.8 m / s, the output next line decision sequence could be: the slide rail moves from (30,0) to (55,0) at a speed of 1.2 m / s.

[0105] According to an embodiment of the present invention, the current status information includes the current fire extinguisher position of each of at least one target fire extinguisher, the current ignition point position of the fire point, the current travel parameters of the movable slide rail, the current fire spread information, the current fire information, the current fire hazard situation information, the next fire spread trend, the next fire change trend, and the next fire hazard situation change trend. The next fire spread trend indicates the change trend of the current fire spread information, the next fire change trend indicates the change trend of the current fire information, and the next fire hazard situation change trend indicates the change trend of the current fire hazard situation information. The current fire hazard situation information is used to determine the fire extinguishing priority. The current travel parameters are determined based on the current fire spread speed, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the fire point, the current temperature distribution, and the activation delay of the target fire extinguishers included in the current fire spread information. The current fire hazard situation information is determined based on the current fire spread information, the current fire information, and the configuration risk level of the underground utility tunnel.

[0106] The current travel parameters of the movable slide rail, i.e., the current motion state of the slide rail, including real-time position, travel speed, acceleration, etc., such as when it is located at ( The fire extinguishing equipment's current operational progress is reflected in the following data: Fire spread information (e.g., real-time dynamics of fire spread, including current spread range (e.g., has spread to an area 5-15 meters within the utility tunnel) and spread speed (e.g., 0.5 m / s); and current fire risk status information (e.g., the current fire risk level determined based on a comprehensive assessment, such as high risk or medium risk). This determination considers not only the fire itself but also the importance level of the utility tunnel environment.

[0107] The next fire spread trend refers to predicting the change of the fire spread in the future short time, such as the spread speed will increase to 0.7 m / s in the future 10 seconds, and the range will expand to the northwest, which is the trend extension of the current spread information. The next fire change trend is used to predict the change of the fire intensity in the future period of time, such as the temperature peak will rise to 900℃ in the future 15 seconds, and the burning rate will accelerate, which is the trend extension of the current fire information. The next fire danger situation change trend is used to predict the change of the fire danger level in the future, such as it will be upgraded from'medium risk' to 'high risk' in the future 20 seconds, which is the trend extension of the current fire danger situation.

[0108] According to an embodiment of the present application, the next fire spread trend, the next fire change trend and the next fire danger situation change trend are determined according to the current other environment information, the current fire information and the current fire danger situation information, wherein the current other environment information indicates the environment information synchronized with the current temperature distribution information included in the current fire information in the time dimension.

[0109] To obtain the next fire spread trend, the next fire change trend and the next fire danger situation change trend, three types of key data need to be referred to at the same time. The first type is the current fire information, such as the temperature peak, the flame size and the burning rate; the second type is the current fire danger situation information; and the third type is the current other environment information. Among them, the current other environment information needs to be collected at the same time as the temperature distribution in the current fire information, such as the temperature and the environment data are collected at the same time The temperature and the environment data are collected at the same time, which avoids the data mismatch caused by the time difference.

[0110] The current other environment information can also specifically include the humidity, the oxygen concentration, the combustible gas concentration, the ventilation condition, the wind speed and the wind direction in the pipe gallery synchronized with the current temperature, and these environmental factors will directly affect the fire development, such as high humidity may slow down the fire, and high combustible gas concentration may accelerate the spread. Only focusing on the current fire information and the current fire danger situation can predict the spread speed in the next stage, but if the prediction result is combined with the current other environment information, it is more in line with the actual fire development law.

[0111] According to an embodiment of the present application, the next fire spread trend, the next fire change trend and the next fire danger situation change trend are obtained by decoding the intermediate feature vector, the intermediate feature vector is obtained by processing the fusion feature vector by using the self-attention strategy, the fusion feature vector is obtained according to the current other environment information, the current fire information and the current fire danger situation information, and the intermediate feature vector indicates the high-level semantic feature carrying the global context information.

[0112] According to an embodiment of the present application, the prediction of the next fire spread trend, the next fire change trend and the next fire danger situation change trend can be realized by using a Transformer model. The Transformer model takes the temperature distribution sequence, the fire risk level, the fire spread information, the current position of the fire extinguisher, the initial operating state, etc. as input, and captures the key patterns and long-range dependencies in the fire evolution process through its self-attention mechanism. The fire change trend is effectively learned from the complex temperature time series and spatial distribution, and the prediction result of the development of the fire in the future short time is output, including the change of the temperature field in the future several seconds, the direction and speed of the possible spread of the flame, and the change trend of the fire source strength, etc. Moreover, the prediction output of the Transformer model can be used to adjust the first current driving parameter or the second current driving parameter to adapt to the development trend of the fire source. If the Transformer predicts that the fire will rapidly expand in a certain direction and the fire source strength will rise, the output result will correspondingly increase the moving speed of the slide rail or adjust the nozzle direction in advance to suppress the fire before the fire spreads. In this way, the sensitivity to the dynamic change of the fire is improved to quickly respond to the fire.

[0113] According to an embodiment of the present application, the current driving parameter is determined according to at least one of the first current driving parameter or the second current driving parameter, the first current driving parameter is obtained by processing the current fire spread speed included in the current fire spread information, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, the current temperature distribution included in the current fire information and the start-up delay of the target fire extinguisher by using a first driving parameter prediction model, wherein the first driving parameter prediction model is a traditional physical model. Referring to formula (1).

[0114] Formula (1)

[0115] wherein, is the start-up delay duration of the movable slide rail, i.e. the time from receiving the instruction to actually starting to move, usually in seconds; is the driving time (unit: seconds) of the movable slide rail from the current position to the ignition point; d is the distance (unit: meters) between the current position of the slide rail and the ignition point; is the current fire spread speed (unit: meters / second).

[0116] The first driving parameter prediction model is used to indicate that the sum of the start-up delay and the driving time of the slide rail must be less than or equal to the time required for the fire to spread to the current position of the slide rail. In this way, it can be ensured that the movable slide rail moves to the ignition point to complete the fire extinguishing intervention before the fire spreads to its own position, so as to ensure the timeliness of fire extinguishing.

[0117] The travel time required for the movable slide rail to move from the current position to the ignition point is calculated according to formula (2).

[0118] Formula (2)

[0119] wherein, is the acceleration time (unit: second) required for the movable slide rail to accelerate from starting to the target speed ; is the constant speed time (unit: second) required for the slide rail to travel at the target speed to the remaining distance of the ignition point; is the target travel speed of the slide rail, i.e., the stable moving speed expected to be reached, unit: meter / second; is the acceleration of the slide rail (unit: meter / second²), reflecting the speed change.

[0120] The acceleration time required for the movable slide rail to accelerate from starting to the target speed is calculated according to formula (3):

[0121] Formula (3)

[0122] Formula (4)

[0123] According to an embodiment of the present application, the second current travel parameter is obtained by processing at least one of the current fire spread speed included in the current fire spread information, the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the ignition point, the current temperature distribution included in the current fire information, or the starting delay of the target fire extinguisher, by using a second travel parameter prediction model, wherein the second travel parameter prediction model is a deep learning time series model.

[0124] The second travel parameter prediction model is a model trained based on a large amount of historical fire scene data and historical slide rail operation data, which can be a machine learning model, a neural network model, etc., such as a Long Short-Term Memory (LSTM model). The model internally establishes a mapping relationship between fire spread features and slide rail travel parameters. The real-time collected fire spread information is input into the deep learning time series model, and the next motion control parameter most suitable for the current fire is output. For example, when the fire spread speed is 2 meters / minute, the model outputs the real-time travel speed of the slide rail as 8 meters / minute, the acceleration as 0.5 m / s², etc.

[0125] According to an embodiment of the present application, the current fire risk situation information comprises at least one of a current fire source intensity or a current fire risk level, the current fire source intensity is determined according to the current fire situation information, the current fire source intensity indicates a rate of energy release of the current fire source and a spatial decay rate of thermal influence of the current fire source, and the current fire risk level is determined according to the current fire source intensity, the current fire spread information and a configuration risk level of the underground pipe gallery.

[0126] The current fire source intensity indicates the intensity of the fire source combustion, and is a quantification of the energy release intensity of the fire itself. The current fire source intensity is determined according to a temperature peak value, a flame size, a combustion rate, a heat release rate, etc. Specifically, a pre-trained model can be used to process the temperature peak value, the flame size, the combustion rate, the heat release rate, etc. obtained in real time to output the current fire source intensity information. For example, for an underground pipe gallery fire, a fire source with a temperature peak value of 800℃ and a combustion rate of 0.3kg / s has a current fire source intensity much higher than a fire source with a temperature peak value of 400℃ and a combustion rate of 0.1kg / s.

[0127] By having the trained model learn the underground pipe gallery fire and fire spread characteristics, the fire spread information can be perceived or obtained in advance, the passive situation of relying only on real-time monitoring in fire extinguishing can be broken through, the development trend of the fire can be predicted in advance, sufficient response time can be reserved for the movement of the movable slide rail or the fire extinguisher, the adjustment of the spray angle and other operations, and the best fire extinguishing opportunity can be avoided due to too fast fire spread. On the other hand, based on the prediction information, multiple fire extinguishers can be planned to work together, such as calculating the start sequence and spray range of different devices in advance, so that the fire extinguishing force can form a three-dimensional and dynamic coverage of the fire spread area, and the further spread of the fire can be timely suppressed, and the overall prevention and control of the underground pipe gallery fire can be improved.

[0128] Further, after the current fire source intensity is determined, the current fire risk level is determined in combination with the current fire spread information and the configuration risk level of the underground pipe gallery. Similarly, a pre-trained model can be used to cluster the current fire source intensity, the current fire spread information and the configuration risk level of the underground pipe gallery to obtain the current fire risk level.

[0129] According to an embodiment of the present application, the next action for the decision sequence further comprises at least one next execution control parameter of each target fire extinguisher, and the next control instruction further comprises a next execution control instruction corresponding to each of the at least one next execution control parameter; and the method further comprises: sending the next execution control instruction corresponding to each of the at least one target fire extinguisher to the at least one target fire extinguisher, wherein the next execution control instruction is used to control the target fire extinguisher to extinguish the fire point according to the next execution control parameter indicated by the next execution control instruction.

[0130] The next execution control instruction can include the nozzle turning angle of the target fire extinguisher, the fire extinguishing agent injection pressure, the injection time, etc. While sending the next sliding control instruction to the movable slide rail, the next sliding control instruction is also sent to each target fire extinguisher separately, and the two work together. After receiving the instruction, the slide rail moves to the designated position near the fire point with the fire extinguisher; after receiving the instruction, the fire extinguisher completes the fire extinguishing action according to the next execution control parameter, such as adjusting the nozzle to aim at the root of the flame and injecting the fire extinguishing agent at the appropriate pressure, to solve the problem of accurate fire extinguishing.

[0131] Specifically, the initial angle of the nozzle of at least one target fire extinguisher is obtained; the target angle to which the nozzle of at least one target fire extinguisher should be directed is calculated according to the current fire extinguisher position and the current fire point position of each target fire extinguisher; and the target rotation angle is calculated according to the initial angle and the target angle.

[0132] When the nozzle injection angle needs to be adjusted, the controller calculates the target angle that the target fire extinguisher needs to adjust according to the fire source position, and sends a driving instruction to the servo motor of the inner slide rail mechanism. The motor drives the lead screw to rotate, causing the slide block to move a predetermined distance along the guide rail; through the transmission of the connecting rod mechanism, the linear movement of the slide block is converted into the angular deflection of the nozzle, until the actual angle of the nozzle is consistent with the target angle. The angle sensor feeds back the nozzle angle in real time, and if there is a deviation, the controller will drive the slide rail mechanism for secondary fine adjustment to ensure the injection angle, thereby achieving accurate injection of the fire source.

[0133] The initial angle of the nozzle of the fire extinguishing bottle is pre-set to be within the range of 0° vertically downward to 45° offset to the inside of the pipe gallery. The nozzle angle in the clamping groove is prioritized to be ready, and the spread advance is considered as a supplement. The movable slide rail can be a linkage structure composed of two layers of annular slide rails. One layer is an outer ring slide rail, on which the fire extinguishers are mounted; and one layer is an inner ring slide rail, which is a relatively smaller annular liftable and movable slide rail, located inside the outer ring slide rail and connected to the fire extinguishers of the outer ring through connecting rods. Each fire extinguishing bottle has one connecting rod, and the connection point is located at the side of the fire extinguishing bottle near the lower end.

[0134] The specific method of controlling the direction of the nozzle of the fire extinguisher can be to change the injection direction of the nozzle of the fire extinguishing agent bottle by lifting the inner ring slide rail, so as to cover the fire point. Specifically, in the initial state, the inner ring slide rail is at the original height position, at which time the nozzle of the fire extinguishing bottle is directed 45° inward, i.e. obliquely towards the inside of the pipe gallery. After the fire point is located, when the coordinates of the specific fire point are obtained, the inner ring slide rail is moved downward to adjust the height, driving the connecting rod to move downward synchronously, and then the direction of the nozzle of the fire extinguishing bottle is changed, which can be adjusted within the range of 0° vertically downward to 45° offset to the inside of the pipe gallery, so as to aim at the fire point or the fire spread range for fire extinguishing.

[0135] Another method for controlling the orientation angle of a fire extinguisher nozzle is a geometric calculation method based on spatial coordinates, using coordinate differences to calculate the relative angle. Specifically, a temperature detection module identifies the spatial location of the fire source, and closed-loop control is used to align and track the nozzle angle. First, the temperature detection module determines the three-dimensional coordinate position P of the fire source. Given the location P of the fire extinguishing nozzle. Then, the pitch angle required for the nozzle to point towards the fire source can be calculated. The pitch angle is determined based on the relative positional difference between the nozzle and the ignition source. For example, if the vertical downward direction of the nozzle is defined as the pitch angle... Based on the reference, the angle of the nozzle relative to the vertical downward direction satisfies the relational formula (5).

[0136] Formula (5)

[0137] when The nozzle sprays vertically downwards. At 45°, the nozzle points forward at a 45° angle. Using the above geometric relationship, the controller can calculate the target spray angle in real time based on the position coordinates of the fire source and the nozzle. .

[0138] After determining the target spray angle, closed-loop control is used to adjust the nozzle angle to achieve precise alignment. The controller will calculate the target angle. With the current angle of the nozzle Comparison to form angular deviation Then, the controller drives the nozzle to rotate via the motor on the inner slide rail based on the deviation. The control process adopts a proportional-integral-derivative control algorithm to ensure rapid and stable adjustment. The control quantity u(t) output by the controller can be expressed as formula (6).

[0139] Formula (6)

[0140] Among them, K P ,K I ,K D These are the proportional, integral, and derivative coefficients of the controller. u(t) is the motor control voltage / pulse command output by the controller (usually in V or pulse count), used to drive the motor to adjust the nozzle pitch angle, and is the execution signal of the control system. The angle deviation at the current moment (unit: degrees).

[0141] The above control equations calculate the drive signal based on the real-time angle error and continuously adjust the nozzle angle. As the inner slide rail motor rotates, the nozzle angle changes towards the target value, and the closed-loop feedback will reduce the angle error. Gradually decreases. When the nozzle reaches the target angle, the controller output tends to zero, and the motor stops rotating, thus stably maintaining the nozzle at the required angle.

[0142] Wherein, the target angle of the nozzle of the target fire extinguisher can also be calculated according to the position of the fire source by using a transformer model. The current position of the fire source, the current position of at least one target fire extinguisher, and the initial angle of the nozzle of at least one target fire extinguisher are input into the transformer model to obtain the target angle of the nozzle of at least one target fire extinguisher.

[0143] Through the precise feedback of the angle sensor and the closed-loop control, the final steady-state error is controlled within °, so as to ensure that the fire extinguishing agent jet accurately hits the fire source position. At the same time, the angle control system can also realize automatic tracking of the target fire source: once the position P( ) of the fire source changes, the controller will recalculate the required jet angle according to the new fire source coordinates and immediately adjust the nozzle angle to follow the changing fire source.

[0144] According to the embodiment of the present application, the nozzle of the target fire extinguisher is provided with an electric heat ignition device connected with the temperature-sensitive release device; wherein the underground pipe gallery fire extinguishing method further comprises: for any one of the at least one target fire extinguisher, in response to satisfying the working condition of the electric heat ignition device of the target fire extinguisher, sending an electric heat ignition control instruction to the target fire extinguisher, wherein the electric heat ignition control instruction is used to drive the electric heat ignition device of the target fire extinguisher to generate heat for heating the temperature-sensitive release device, so that the temperature-sensitive release device breaks in response to the detected temperature being greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the fire extinguishing agent.

[0145] In the case that the electric heat ignition device itself is in a normal working state, such as normal power supply, no short circuit or open circuit failure, good contact with the temperature-sensitive release device, and the starting time is matched with the fire extinguishing demand, the electric heat ignition control instruction acts on the electric heat ignition device (such as electric heating wire, semiconductor heating sheet) inside the fire extinguisher. After receiving the instruction, the internal circuit of the electric heat ignition device is turned on, the heating element is quickly heated, and the heat generated is directly transmitted to the temperature-sensitive release device in contact with it. The temperature-sensitive release device is filled with a heat-sensitive material and has a fixed breaking temperature threshold, such as 70℃, 100℃, which is selected according to the fire extinguishing scene. When the heat transmitted by the electric heat ignition device makes the detected temperature of the temperature-sensitive release device ≥ the preset threshold, the heat-sensitive material will change physically, such as alloy melting, liquid expanding and breaking the shell, causing the device to break. The fire extinguishing agent channel (such as high-pressure pipeline) originally blocked by the device is opened. The fire extinguishing agent (such as dry powder, carbon dioxide) stored in the fire extinguisher is under pressure and flows along the channel to the nozzle, and finally releases to the fire point through the nozzle to achieve fire extinguishing.

[0146] In the case of abnormal working state of the electric heat ignition device itself or disconnection of communication between the controller and the electric heat ignition device, the electric heat ignition device cannot receive the electric heat ignition instruction. The passive release of the extinguishing agent can be realized through the mechanical temperature-sensitive valve, so that the extinguishing function is not interrupted. Specifically, the first step is temperature sensing and valve core change. When the temperature of the fire scene increases to the preset threshold of the mechanical temperature-sensitive valve as the fire spreads, the temperature-sensitive valve core changes physically. Among them, if the temperature-sensitive valve core is a low-melting alloy, it will directly melt; if the temperature-sensitive valve core is a thermal sensitive expansion material, it will expand and generate a pushing force. The second step is valve opening and channel conduction. The melting or expansion of the temperature-sensitive valve core will lose the blocking ability of the valve. After the low-melting alloy melts, the valve core structure collapses, and the valve is automatically opened under the action of the extinguishing agent itself pressure; the thermal sensitive expansion material pushes the valve core to displace and opens the extinguishing agent channel. The third step is the release of the extinguishing agent and extinguishing. After the channel is conducted, the extinguishing agent (such as dry powder, carbon dioxide) stored in the extinguisher under the action of pressure difference flows along the pipeline to the nozzle and directly sprays to the ignition point, completing the passive extinguishing.

[0147] The combination of electric heat ignition triggering and mechanical temperature-sensitive valve triggering realizes the reliable rupture of the thermal sensitive glass ball in different working conditions through active heating and passive temperature sensing, realizes the release of the extinguishing agent, takes into account the flexibility of electronic control and the independence of mechanical insurance, and thus improves the overall safety and reliability of the system. Specifically, for possible failures of the controller and communication state, the mechanical temperature-sensitive valve as a completely independent passive triggering component does not need to rely on any electrical signal or external control, and can start extinguishing only through the ambient temperature of the fire scene, avoiding the situation that the fire is not extinguished and the system fails due to single link failure of electric control; for the possible response lag problem of mechanical triggering, the electric heat ignition triggering can actively heat the temperature release device through the electric control instruction to realize the response in seconds, and the two form the logic of active priority and passive compensation, so that the extinguishing function can be effectively triggered whether the electric control is normal or not, greatly improving the overall reliability of the system.

[0148] In the scene of low ambient temperature at the initial stage of the fire scene but requiring rapid extinguishing, the electric heat ignition triggering can accurately control the starting time through the electric control instruction, avoiding the delay of the mechanical temperature-sensitive valve due to the ambient temperature not reaching the threshold, so that the extinguishing time is not delayed; in the extreme scene of rapid increase of the temperature of the fire scene and easy damage of the electric control elements, even if the electric heat ignition device or the communication link is burned out, the mechanical temperature-sensitive valve can still be triggered by sensing the ambient temperature, is not disturbed by high temperature and thick smoke, adapts to complex and harsh extinguishing environment, and ensures that the extinguishing function is not interrupted.

[0149] Therefore, the double protection of the safety redundant design effectively avoids the risk of fire extinguishing failure caused by single component failure in the traditional single electric control or mechanical trigger mode, and the combination of the two forms a "double trigger path", and the fire extinguishing can be realized as long as any path is normal. The redundant design can effectively reduce the risk of fire expansion caused by system failure. Avoiding the development of fire from small fire to large-scale open fire, reducing the damage of fire to underground pipe gallery structure and pipeline facilities, and reducing economic loss and safety hazard.

[0150] According to the embodiment of the application, the current fire information further includes at least one of the following: current temperature distribution information, current temperature rise rate or current combustion rate. At least one of the current temperature distribution information, the current temperature rise rate or the current combustion rate is processed by using a fire source identification model to obtain a fire source type; a next fire extinguishing agent instruction is generated according to the determination of a fire extinguishing agent matched with the fire source type from a plurality of fire extinguishing agents; and the next fire extinguishing agent instruction is sent to at least one target fire extinguisher, wherein the fire extinguishing agent instruction is used to control the target fire extinguisher to extinguish the fire by using the fire extinguishing agent indicated by the fire extinguishing agent instruction.

[0151] The currently collected fire field temperature related parameters include: current temperature distribution information such as temperature values of different regions, shape and range of high temperature area, for example, local point temperature up to 800°C, and steep temperature gradient around; current temperature rise rate; and current combustion rate. The fire source identification model is an algorithm model trained based on a large amount of fire sample data, for example, a convolutional long short-term memory network (CNN-LSTM model), which has learned the mapping relationship between different fire source types and temperature characteristics in advance. For example: initial temperature rise rate is extremely fast (> 20°C / s), local temperature peak value is high (> 500°C), and fire point area is small. At the same time, local electromagnetic disturbance, transient voltage fluctuation or current peak is detected. Temperature data and electrical monitoring module signal are synchronously triggered, that is, it is determined as an electrical short circuit fire. The temperature rise rate is moderate (3~10°C / s), the temperature peak value is 250~400°C, the heat distribution is in the form of strip or plane, the combustion duration is long, and the fire point is accompanied by strong smoke density and continuous temperature rise. The temperature rise rate is fast (10~20°C / s), the flame height is large, and the temperature distribution dynamic fluctuation is obvious. If the system detects that the temperature rise and smoke anomaly at multiple points and the diffusion rate are fast, it is determined as liquid or mixed combustion. After the model analyzes the input temperature parameters, the specific fire source type is output, such as cable short circuit fire or diesel leakage fire.

[0152] Further, according to different fire source types, the type of fire extinguishing agent is determined. For example, if an electrical equipment short circuit fire occurs, etc., a fire extinguishing agent such as carbon dioxide can be sprayed alone If solid fire source such as cable or waste paper is burned, the ABC dry powder can be sprayed first; if liquid flammable material or unknown fire source is encountered, two-dose combined spraying strategy can be used.

[0153] Figure 6(a) shows the fire extinguishing effect diagram of the traditional fire extinguishing method at the 30th second after the fire breaks out.

[0154] Figure 6(b) shows the fire extinguishing effect diagram according to the embodiment of the present application at the 30th second after the fire breaks out.

[0155] Figure 7(a) shows the fire extinguishing effect diagram of the traditional fire extinguishing method at the 60th second after the fire breaks out.

[0156] Figure 7(b) shows the fire extinguishing effect diagram according to the embodiment of the present application at the 60th second after the fire breaks out.

[0157] Figure 8(a) shows the fire extinguishing effect diagram of the traditional fire extinguishing method at the 90th second after the fire breaks out.

[0158] Figure 8(b) shows the fire extinguishing effect diagram according to the embodiment of the present application at the 90th second after the fire breaks out.

[0159] Wherein, the darker the color represents the closer to the deep red, indicating that the fire is larger; the lighter the color is closer to colorless, indicating that the fire gradually returns to the original environment.

[0160] As shown in Figure 6(a), the temperature monitoring cloud diagram of the traditional fire extinguishing method at the 30th second after the fire breaks out at the 1.7m height plane fire field. As shown in Figure 6(b), the temperature monitoring cloud diagram of the fire extinguishing method of the present application at the 30th second after the fire breaks out at the 1.7m height plane fire field.

[0161] As shown in Figure 7(a), the temperature monitoring cloud diagram of the traditional fire extinguishing method at the 60th second after the fire breaks out at the 1.7m height plane fire field. As shown in Figure 7(b), the temperature monitoring cloud diagram of the fire extinguishing method of the present application at the 60th second after the fire breaks out at the 1.7m height plane fire field.

[0162] As shown in Figure 8(a), the temperature monitoring cloud diagram of the traditional fire extinguishing method at the 90th second after the fire breaks out at the 1.7m height plane fire field. As shown in Figure 8(b), the temperature monitoring cloud diagram of the fire extinguishing method of the present application at the 90th second after the fire breaks out at the 1.7m height plane fire field.

[0163] According to the fire development trend of Figure 6(a), Figure 7(a) and Figure 8(a), it can be seen that the color gradually becomes darker, indicating that since the fire time, with the continuous extension of time, the traditional fire extinguishing method is difficult to suppress the spread of fire in a short time, but shows the trend of expanding and serious fire.

[0164] As can be seen from Figures 6(b), 7(b) and 8(b) as a whole, the color gradually becomes lighter, indicating that with the extension of time, the fire has been effectively controlled and gradually reduced.

[0165] Thus, according to FIG. 6(a) and FIG. 6(b), FIG. 7(a) and FIG. 7(b), and FIG. 8(a) and FIG. 8(b), it can be seen that at the same time point after ignition, compared with the conventional fire extinguishing method, the fire extinguishing method of the present application has better fire extinguishing effect and can effectively control the spreading range and speed of the fire in a short time, thereby effectively preventing the fire from further spreading.

[0166] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for extinguishing fires in underground utility tunnels, characterized in that, The method includes: Based on the current fire spread information, the current fire situation information, the current extinguisher positions of at least one target fire extinguisher, and the current ignition point position of the fire point, the next step is determined as a decision sequence, including: determining current status information based on the current fire spread information, the current fire situation information, the current extinguisher positions of at least one target fire extinguisher, and the current ignition point position of the fire point; wherein, the current status information includes the current travel parameters of the movable slide rail, which are determined based on the current fire spread speed included in the current fire spread information, the current extinguisher positions of at least one target fire extinguisher, the current ignition point position of the fire point, the current temperature distribution included in the current fire situation information, and the activation delay of the target fire extinguisher; the current fire spread information indicates the current fire spread range and the current fire spread speed; the current fire situation information indicates at least one of the physical energy state or the intensity of evolution of the current fire; the next step is determined as a decision sequence including the next motion control parameters of the movable slide rail, which is located on a fixed track in the underground utility tunnel; Based on the next action decision sequence, a next control instruction is generated, wherein the next control instruction includes a next sliding control instruction corresponding to the next motion control parameter; Send the next sliding control command to the movable slide rail where each of the at least one target fire extinguisher is located, wherein the next sliding control command is used to control the movable slide rail where each of the at least one target fire extinguisher is located to slide along the fixed track according to the next travel parameter indicated by the next motion control parameter, so as to drive the at least one target fire extinguisher to slide, so that the at least one target fire extinguisher extinguishes the fire at the fire point. The at least one target fire extinguisher is determined from among the multiple fire extinguishers based on their respective current fire extinguisher positions, the current fire spread information, and the current ignition point position, and each of the multiple fire extinguishers has a movable slide rail.

2. The method according to claim 1, characterized in that, Based on the current fire spread information, the current fire situation information, the current location of each of the at least one target fire extinguisher, and the current location of the ignition point, the next step is determined as a decision sequence, which also includes: The agent's policy network is used to process the current state information to obtain the next action decision sequence.

3. The method according to claim 2, characterized in that, The current status information also includes the current fire extinguisher position of each of the at least one target fire extinguisher, the current ignition point position of the fire point, the current fire spread information, the current fire information, the current fire risk situation information, the next fire spread trend, the next fire change trend, and the next fire risk situation change trend. The next fire spread trend indicates the change trend of the current fire spread information, the next fire change trend indicates the change trend of the current fire information, and the next fire risk situation change trend indicates the change trend of the current fire risk situation information. The current fire risk situation information is used to determine the fire extinguishing priority. The current fire risk situation information is determined based on the current fire spread information, the current fire situation information, and the risk level of the underground utility tunnel configuration.

4. The method according to claim 3, characterized in that, The next fire spread trend, the next fire change trend, and the next fire risk situation change trend are determined based on current other environmental information, the current fire information, and the current fire risk situation information. The current other environmental information refers to environmental information that is synchronized with the current temperature distribution included in the current fire information in the time dimension.

5. The method according to claim 4, characterized in that, The next fire spread trend, the next fire change trend, and the next fire risk situation change trend are obtained by decoding the intermediate feature vector. The intermediate feature vector is obtained by processing the fused feature vector using a self-attention strategy. The fused feature vector is obtained based on the current other environmental information, the current fire information, and the current fire risk situation information. The intermediate feature vector indicates high-level semantic features carrying global context information.

6. The method according to any one of claims 3 to 5, characterized in that, The current driving parameters are determined based on at least one of a first current driving parameter or a second current driving parameter. The first current driving parameter is obtained by processing the current fire spread information, including the current fire spread speed, the current position of each of the at least one target fire extinguisher, the current ignition point position of the fire point, the current temperature distribution, and the activation delay of the target fire extinguisher, using a first driving parameter prediction model. The first driving parameter prediction model is a traditional physical model. The second current driving parameter is obtained by processing at least one of the current fire spread information, including the current fire spread speed, the current position of each of the at least one target fire extinguisher, the current ignition point position of the fire point, the current temperature distribution, and the activation delay of the target fire extinguisher, using a second driving parameter prediction model. The second driving parameter prediction model is a deep learning temporal model. And / or The current fire risk situation information includes at least one of the current fire source intensity or the current fire risk level. The current fire source intensity is determined based on the current fire information. The current fire source intensity indicates the energy release rate of the current fire source and the spatial decay rate of the thermal effect of the current fire source. The current fire risk level is determined based on the current fire source intensity, the current fire spread information, and the configuration risk level of the underground utility tunnel.

7. The method according to claim 1, characterized in that, The next action decision sequence also includes the next execution control parameters for each of the at least one target fire extinguisher, and the next control instruction also includes the next execution control instruction corresponding to each of the at least one next execution control parameter; The method further includes: Send a next execution control command corresponding to each of the at least one target fire extinguisher, wherein the next execution control command is used to control the target fire extinguisher to extinguish the fire at the ignition point according to the next execution control parameters indicated by the next execution control command.

8. The method according to claim 1, characterized in that, The nozzle of the target fire extinguisher is equipped with an electric hot spot ignition device connected to a temperature-sensing release device. The method further includes: For any one of the at least one target fire extinguishers, In response to meeting the operating conditions of the electrothermal ignition device of the target fire extinguisher, an electrothermal ignition control command is sent to the target fire extinguisher, wherein the electrothermal ignition control command is used to drive the electrothermal ignition device of the target fire extinguisher to generate heat for heating the temperature-sensing release device, so that the temperature-sensing release device ruptures in response to the detected temperature being greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the extinguishing agent.

9. A fire extinguishing system for underground utility tunnels, characterized in that, The system includes: Fixed track; Multiple movable slide rails located on the fixed track; Multiple fire extinguishers, each of which has a movable slide rail located on the [missing information]. Controller, used for: Based on the current fire spread information, the current fire intensity information, the current positions of at least one target fire extinguisher, and the current ignition point position of the fire point, the next step is determined as a decision sequence, including: determining current status information based on the current fire spread information, the current fire intensity information, the current positions of at least one target fire extinguisher, and the current ignition point position of the fire point; wherein, the current status information includes the current travel parameters of the movable slide rail, and the current travel parameters are determined based on the current fire spread information including the current fire spread speed, the current positions of at least one target fire extinguisher, and the current ignition point position of the fire point; The current ignition point location of the fire, the current fire information including the current temperature distribution, and the activation delay of the target fire extinguisher are determined. The current fire spread information indicates the current fire spread range and the current fire spread speed. The current fire information indicates at least one of the physical energy state or the intensity of evolution of the current fire. The next step is a decision sequence including the next motion control parameters of the movable slide rail, which is located on the fixed track. The at least one target fire extinguisher is determined from the plurality of fire extinguishers based on their respective current fire extinguisher positions, the current fire spread information, and the current ignition point location. Based on the next action decision sequence, a next control instruction is generated, wherein the next control instruction includes a next sliding control instruction corresponding to the next motion control parameter; Send the next sliding control command to the movable slide rail where each of the at least one target fire extinguisher is located; The movable slide rails on which each of the at least one target fire extinguisher is located are used to slide along the fixed rails under the control of the next sliding control command and according to the next travel parameters indicated by the next motion control parameters, so as to drive the at least one target fire extinguisher to slide. The at least one target fire extinguisher is used to extinguish the fire at the ignition point.

10. The system according to claim 9, characterized in that, The distance between two adjacent fire extinguishers located on the same movable slide rail is determined based on the configuration risk level of the area to which the movable slide rail belongs; and / or The fire extinguisher includes: At least two fire extinguishing cylinders, each having a corresponding spray path and loaded with a corresponding type of extinguishing agent, with different fire extinguishing cylinders carrying different types of extinguishing agents; and / or The controller is deployed on an edge device; and / or The target fire extinguisher includes: nozzle; A mechanical ignition device is located in the nozzle. The mechanical ignition device includes a temperature-sensitive release device, which is used to break in response to a detected temperature being greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release extinguishing agent. An electric ignition device is located in the nozzle and connected to the temperature-sensing release device. The electric ignition device is used to heat the temperature-sensing release device in response to an electric ignition control command from the controller, so that the temperature-sensing release device breaks in response to a detected temperature greater than or equal to a preset temperature threshold, thereby triggering the nozzle to release the extinguishing agent. The electric ignition control command is generated by the controller in response to meeting the operating conditions of the electric ignition device of the target fire extinguisher.

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