External fire rescue system for train fire in interval tunnel

Abstract

The utility model discloses an external fire rescue system for train fire in a section tunnel, which comprises an automatic fire alarm device, a pump set, a fire-fighting medium storage box, an area valve group, sprayers and a system connecting pipeline, the pump set and the fire-fighting medium storage box are arranged in train carriages, and a plurality of connected sprayers are circumferentially arranged outside the joint of the carriages of the train. The fire extinguishing device is used for spraying fire-fighting media between a train and the inner wall of a tunnel for fire control and extinguishment, the sprayers are connected with the regional valve banks, the regional valve banks are connected with the pump sets, the pump sets are connected with the fire-fighting medium storage boxes, the fire extinguishing controllers are installed in cabs of the head carriage and the tail carriage respectively and used for controlling the pump sets and the regional valve banks, and the automatic fire alarm devices are installed in all the carriages. The annular fire extinguishing system is arranged outside the train, so that the problems of fire extinguishing evacuation in the middle of the train, fire extinguishing evacuation of multiple trains in a section at the same time, potential safety hazards of no evacuation platform in old lines, protection of section structures and equipment facilities, difficulty in construction of section air shafts and connection channels and the like are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of rail transit tunnel fire fighting technology, concretely relates to a kind of external fire fighting rescue system for interval tunnel train fire. BACKGROUND

[0002] Interval tunnel refers to the tunnel between two stations of urban rail transit, divided into two types of underground and ground.

[0003] When train fire occurs in interval tunnel, under the condition that train can still run, the principle is to drive the train on fire to the nearest station in front to evacuate, that is, the fire evacuation scheme of rail train fire.

[0004] When train fire occurs in interval tunnel and stops in interval tunnel, passengers can evacuate to non-fire interval tunnel and adjacent station through evacuation platform and communication passage as soon as possible, but need to wait for the passengers at the end of the train on fire to evacuate first, then execute longitudinal ventilation and smoke exhaust mode in fire interval tunnel, send air to the tunnel direction where evacuation is completed first, send new air to the other end of passenger evacuation, and exhaust smoke to the opposite direction of evacuation. There are mainly two working conditions: (1) there is only one train in a certain section of interval tunnel, and when the train head or tail is on fire, assuming that there are very few passengers at one end and they can evacuate to the safe area in a very short time, the longitudinal ventilation and smoke exhaust mode has little evacuation safety risk; when the train is on fire in the middle (second to fifth carriages), since there are many passengers at both ends, waiting for the passengers at one end to evacuate first before starting the longitudinal ventilation and smoke exhaust mode will have a very high evacuation safety risk; (2) there are two trains in a certain section of interval tunnel, and the traditional method is to set interval air shaft in the middle of interval tunnel to separate the long interval tunnel into a working condition where there is only one train in the corresponding interval tunnel section, and the evacuation scheme of each short interval tunnel section is the same as (1); when there is no interval air shaft in a certain interval tunnel section, but there are two trains in the interval tunnel, the longitudinal ventilation and smoke exhaust mode has a very high evacuation safety risk, such as the working condition of front train tail fire and rear train head fire.

[0005] For some old subway lines, interval tunnel has no evacuation platform, and only end door with a capacity of 1 person passing through can be used for longitudinal evacuation. Since there are many passengers on the train, the evacuation time is very long. In order to ensure that the temperature, smoke and other conditions in the train can be controlled in time, create better conditions for passenger evacuation, reduce fire hazards, many lines install water mist fire extinguishing system in subway carriages. When there is a fire source and smoke in the train, the temperature and smoke can be controlled in the first time, which can gain valuable time for passenger evacuation and fire fighting rescue, and maximize the safety of subway assets, ensure that the subway system can resume normal operation as soon as possible, and minimize the social and economic impact of fire.

[0006] Considering the difficulty and great harm of train fire evacuation in the interval tunnel, there is a scheme to set a fixed water mist ring on the inner wall of the interval tunnel with a spacing of about 300m, but the position of the water mist ring is fixed and the spacing is too large, far exceeding the length of a train (about 118m), which cannot concentrate and accurately control fire and cannot affect the visibility and evacuation speed of passengers; the water mist ring is too dispersed and too high in the whole line underground interval, and it is difficult to ensure the inspection frequency and quality, and the risk of damage, falling and system failure is difficult to control. Practical new type content

[0007] The utility model provides a kind of external fire fighting rescue system for interval tunnel train fire for the deficiency of prior art, annular fire fighting system is arranged outside train, and the problems of fire fighting evacuation in train, fire fighting evacuation of multiple trains in interval, safety hazard of evacuation platform in old line, protection of interval structure and equipment, difficulty of interval air shaft and liaison passage construction are comprehensively solved.

[0008] The utility model realizes the purpose by the following technical scheme:

[0009] A kind of external fire fighting rescue system for interval tunnel train fire, including fire automatic alarm equipment, pump group, fire extinguishing medium storage tank, regional valve group, nozzle and system connecting pipeline, the pump group and the fire extinguishing medium storage tank are arranged in train carriage, a plurality of connected nozzles are arranged in the form of annular nozzle group at the outside of train car connection in the form of annular nozzle group, for spraying fire extinguishing medium between train and tunnel inner wall to control fire and extinguish fire, the nozzle is connected with the regional valve group, the regional valve group is connected with the pump group, the pump group is connected with the fire extinguishing medium storage tank, a set of fire extinguishing controller is installed in the head car and tail car cab respectively, for controlling the pump group and the regional valve group, the fire automatic alarm equipment is installed in each train carriage.

[0010] Further, the nozzle is installed at the lower part of the head car and tail car end of train respectively.

[0011] Further, the fire extinguishing medium is water or intumescent fireproof foam, and the nozzle connected with corresponding fire extinguishing medium storage tank is respectively water mist nozzle or fireproof foam nozzle, and the annular nozzle group is composed of nozzles of the same type.

[0012] Further, the water mist nozzle and the fireproof foam nozzle are arranged at different positions of train respectively, and the water mist nozzle at train car connection can spray water mist towards both sides of train car.

[0013] The utility model sets up multiple water mist rings or solid-state fireproof sealing ring fire fighting system outside train, and has the following technical features compared with prior art scheme:

[0014] (1) When the middle of the train is on fire, the two water mist rings near the ends of the fire compartment can control the fire and smoke within the compartment, and other rings can be opened as needed to provide valuable time and safe conditions for passenger evacuation. At the same time, passengers evacuate to adjacent compartments through the interior of the compartment, first trying to evacuate longitudinally within the compartment, away from the fire point and the opened water mist ring, then to the evacuation platform, and then to the other side of the non-fire compartment and the station. When all passengers on one side have evacuated, fresh air can be provided for the evacuation of passengers on the other side. If the fire is not large enough, the fire can be extinguished by the water mist system.

[0015] When the middle of the train is on fire, the two solid-state fireproof sealing rings near the ends of the fire compartment can control the fire and smoke within the compartment, and other solid-state fireproof sealing rings can be opened as needed without affecting passenger evacuation to provide valuable time and safe conditions for passenger evacuation. At the same time, passengers evacuate to adjacent compartments through the interior of the compartment, first trying to evacuate longitudinally within the compartment, away from the fire point and the opened solid-state fireproof sealing ring, then to the evacuation platform, and then to the other side of the non-fire compartment and the station. To prevent the smoke in the sealed section from spreading through the interior of the compartment, the water mist fire extinguishing system inside the corresponding compartment can be opened. The solid-state fireproof sealing ring and the water mist ring can also be used in combination. If the fire is not large enough, the fire can be quickly extinguished. In the traditional fire evacuation scheme, there is no control measure for the fire and smoke in the early stage, and the ventilation system of the station can only be opened after the evacuation of passengers on one side is completed to provide air supply and smoke exhaust for the fire compartment. It takes at least 10-30 minutes for passengers to evacuate on one side, and if there is no fire control and extinguishing measure in the important stage of fire fighting, the smoke and fire will have developed to an uncontrollable extent within this period of time, which will inevitably seriously affect the safety of passengers on the whole train.

[0016] When the middle of the train is on fire, the two solid-state fireproof sealing rings near the ends of the fire compartment can control the fire and smoke within the compartment, and other solid-state fireproof sealing rings can be opened as needed without affecting passenger evacuation to provide valuable time and safe conditions for passenger evacuation. At the same time, passengers evacuate to adjacent compartments through the interior of the compartment, first trying to evacuate longitudinally within the compartment, away from the fire point and the opened solid-state fireproof sealing ring, then to the evacuation platform, and then to the other side of the non-fire compartment and the station. To prevent the smoke in the sealed section from spreading through the interior of the compartment, the water mist fire extinguishing system inside the corresponding compartment can be opened. The solid-state fireproof sealing ring and the water mist ring can also be used in combination. If the fire is not large enough, the fire can be quickly extinguished. In the traditional fire evacuation scheme, there is no control measure for the fire and smoke in the early stage, and the ventilation system of the station can only be opened after the evacuation of passengers on one side is completed to provide air supply and smoke exhaust for the fire compartment. It takes at least 10-30 minutes for passengers to evacuate on one side, and if there is no fire control and extinguishing measure in the important stage of fire fighting, the smoke and fire will have developed to an uncontrollable extent within this period of time, which will inevitably seriously affect the safety of passengers on the whole train.

[0017] (2) It can solve the fire hazard in the compartment for lines with multiple trains in the compartment, and does not need to set up a compartment air shaft.

[0018] Because each train is equipped with multiple water mist rings or solid-state fireproof sealing rings, when a fire occurs, the fire-fighting ring of the fire train can provide reliable protection for passenger evacuation, and the multiple fire-fighting rings of the non-fire train can also provide reliable protection for passenger evacuation. With the continuous development of technology, if the train has good sealing and high temperature resistance, combined with the cooperation of the train ventilation and air conditioning system and the oxygen supply system, under the condition that other conditions are met, passengers on non-fire trains can also wait for rescue in the train in emergency situations.

[0019] In the traditional scheme, short section is absolutely not allowed to exist two trains at the same time, because there is no other suitable smoke control measures except longitudinal smoke exhaust measures. If the longitudinal smoke exhaust is opened, high temperature smoke is very likely to affect the safety of other non-fire train passengers in the section. Therefore, in the section tunnel where multiple trains exist at the same time, the traditional scheme is to set multiple section air shafts to separate a long section tunnel into a short section tunnel where only one train exists at the same time.

[0020] (3) The number of connecting passages and intermediate air shafts can be effectively reduced.

[0021] Because multiple water mist rings or solid fireproof sealing rings are set for each train, the distance between the rings is about 20m, which is very dense. These fire-fighting rings can be opened in order and can play a very good role in cooling, smoke reduction, heat radiation blocking, wetting or smoke blocking, heat radiation blocking, and other fire control and extinguishing in the relatively closed space underground, providing very good safety guarantee for passenger evacuation, and completely replacing part of the traditional fire-fighting and evacuation measures, such as 600m interval section connecting passages and section air shafts.

[0022] In the traditional scheme, there is no other suitable smoke control measure except longitudinal smoke exhaust measures. Therefore, experts require that a section connecting passage must be set at an interval of not more than 600m in combination with the section tunnel structure scheme, longitudinal smoke exhaust scheme, smoke diffusion speed, evacuation time, and evacuation test, so that passengers can evacuate to the non-fire section tunnel as soon as possible.

[0023] Because of the addition of train external water mist ring or solid fireproof sealing ring fire-fighting measures, the interval of section connecting passages is very likely to be expanded to 1000m and above, and even only one section connecting passage is set at the lowest point combined with the section pump house; in addition to considering the requirement of section accident longitudinal ventilation ≥2m / s wind speed, a section air shaft is generally not set for a relatively short long section; even the traditional standard of section accident longitudinal ventilation wind speed requirement ≥2m / s and ≥ critical wind speed can be reduced, so that the configuration standard of related ventilation equipment can be reduced.

[0024] (4) The external fire safety hazard of the train of the old line without evacuation platform can be effectively solved.

[0025] Because the evacuation platform is not set in the underground section tunnel of some early construction subway lines, evacuation can only be carried out through the small end door at both ends of the train. Due to the large number of people, the influence of smoke, panic, few and small train evacuation ports, and other reasons, evacuation will be extremely difficult and the evacuation time will be very long. If a fire occurs outside the train and the fire spreads in the early stage and cannot be controlled, it will inevitably cause significant casualties and losses.

[0026] The utility model discloses a plurality of fine water mist rings or solid fireproof plugging rings are arranged on the outside of the train, can be opened in time and orderly, controls the fire outside the train, provides strong protection for passenger evacuation safety and subway assets.

[0027] (5) can effectively control the spread of the fire outside the train, effectively protect the safety of assets such as interval structure, interval equipment and facilities, vehicles, and ensure the rapid recovery of the subway system.

[0028] The traditional scheme does not actively control the fire and smoke in the early stage, and only removes high-temperature smoke in the interval tunnel in the later stage, which will inevitably cause great loss to assets such as large-scale interval structure, interval equipment and facilities, vehicles, and make it very difficult to recover quickly after the fire.

[0029] Due to the excellent cooling, radiation blocking, smoke adsorption and other fire extinguishing effects of the fine water mist fire extinguishing system, and the excellent smoke blocking and radiation blocking effects of the solid fireproof plugging ring, the utility model sets a fine water mist ring system or a solid fireproof plugging ring on the outside of the train in the interval tunnel fire-fighting scheme, which can effectively control the spread of the fire outside the train and the temperature, effectively protect the safety of assets such as interval structure, interval equipment and facilities, vehicles, and ensure the rapid recovery of the subway system.

[0030] (6) The high-temperature, toxic and colored smoke discharged outdoors can be treated in advance, reducing the social impact.

[0031] The utility model patent sets a fine water mist ring fire extinguishing system, which can cool, smoke and dust very well. With the development of society and technology, other effective media can be added to the fine water mist system to reduce the harm caused by part of terrorist attacks. When the high-temperature, toxic and colored smoke is treated and becomes normal temperature, non-toxic and colorless, and then discharged outdoors, the corresponding social impact can be effectively reduced.

[0032] (7) More powerful, less maintenance workload, and more secure fire safety.

[0033] The utility model patent sets a fine water mist ring or a solid fireproof plugging ring on the train, which can be moved with the train and can accurately control and extinguish fire. The distance between the rings is about 20m, which is relatively concentrated, and the fire control and extinguishing effect is better, and the visibility and evacuation speed of passengers are not affected. The fire-fighting ring outside the train can be concentrated in the vehicle yard section and moved with the train for daily inspection and maintenance, which is more frequent, detailed and simple, and the risk of damage, falling and system failure is lower. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0035] Figure 1 It is a schematic diagram of the train external water mist ring of the present application;

[0036] Figure 2 It is a schematic diagram of the train external solid-state fireproof plugging ring of the present application;

[0037] Figure 3 It is a schematic diagram of the position of the spray head outside the car head;

[0038] Figure 4 It is a schematic diagram of the spray head arrangement structure at the car body junction.

[0039] Reference signs in the drawings: 1-spray head, 2-system connecting pipeline, 3-car body junction, 4-water mist ring, 5-solid-state fireproof plugging ring. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application will be described in detail with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] The present application discloses an embodiment of a tunnel train fire external fire rescue system, like Figures 1 to 4As shown, this train's external fire protection ring system includes automatic fire alarm equipment, pump sets, fire-fighting medium storage tanks, zone valve assemblies, sprinkler heads 1, system connection pipes 2, and a fire extinguishing controller. The automatic fire alarm equipment includes fire detectors, manual alarm buttons, fire alarms, and functional modules. System connection pipes 2 include main connecting pipes and branch pipes connecting each sprinkler head 1. The fire-fighting medium is water or intumescent fire-resistant foam. The sprinkler heads connected to the corresponding storage tanks are either fine water mist sprinkler heads or fire-resistant foam sprinkler heads. Sprinkler heads 1 are installed on the carriages outside the train car connection points 2, arranged circumferentially and connected by a ring pipe to form a ring sprinkler head assembly. Several pump sets, fire-fighting medium storage tanks, and zone valve assemblies are installed in the lower part of the carriages. There are a total of 7 zone valves, each connected to the corresponding carriage's sprinkler head 1 water distribution branch pipe or intumescent fire-resistant foam branch pipe via system connection pipes 2. Fire detectors are installed on the ceiling of each carriage; five sprinkler heads are installed at the junction of the carriages in each six-car train; single high-powered sprinklers or sprinkler heads composed of several sprinklers can be installed in the head and tail carriages; a fire alarm button is installed on the side of each carriage for easy operation; the main pipe is installed under the carriage (for horizontal pump sets) or in the upper mezzanine of the carriage (for vertical pump sets), and the main pipes between carriages are connected by rubber hoses. A fire extinguishing controller is installed in the driver's cab of both the head and tail carriages, which can control the start / stop of the pump sets and the opening / closing of the zone valves. A fire alarm controller is installed next to the fire extinguishing controller to monitor the occurrence of a fire.

[0042] like Figure 4 As shown, several nozzles 1 are installed circumferentially on the outer side of each carriage end of the train. The nozzles are connected to a ring-shaped pipe, which is installed at the end of the carriage outside the train car. The multiple nozzles 1 located at the carriage connection 3 can form a fine water mist ring 4 or a solid fireproof sealing ring 5 between the train and the tunnel wall. By selecting and opening the fire-fighting rings at both ends of the corresponding carriage through the control system, the fire can be controlled within the range of one carriage, playing a role in fire control and extinguishing such as cooling, smoke reduction, or heat insulation and smoke isolation.

[0043] For the fine water mist solution, the storage tank is filled with water, and nozzle 1 is a fine water mist nozzle. When a fire occurs, the automatic fire alarm equipment of the corresponding carriage will be activated, and the pump group and area valve group of the corresponding carriage will be opened through the extinguishing controller in the control room. The fine water mist nozzle will form water mist between the train and the tunnel, which can cover the area of ​​one carriage. For the first and last carriages, a powerful fine water mist nozzle or a fine water mist nozzle group composed of multiple nozzles can be installed to spray fine water mist towards the first or last carriage, covering the entire first or last carriage.

[0044] For the solid fireproof sealing ring solution, intumescent fireproof foam liquid is stored in the storage tank, and fireproof foam nozzles are used. When a fire occurs, the nozzles spray fireproof foam towards the inner wall of the tunnel. After the foam solidifies, it accumulates to form a sealing ring, isolating the carriage where the fire occurs.

[0045] Also can adopt the scheme that water mist and solid-state fireproof sealing ring are combined, water and intumescent fireproof foam liquid are respectively stored in different storage tanks, water mist nozzle group and fireproof foam nozzle group are respectively arranged at different positions of the train, the water mist nozzle group located at the connection of the carriages can spray water mist to both sides of the carriages, and the solid-state fireproof sealing ring is formed at the same time, and the water mist also performs fire control and fire extinguishing.

[0046] The number and form of the nozzles need to ensure that a complete annular closed section is formed in the interval tunnel. In order to avoid uncontrolled diffusion of a large amount of water mist to non-fire carriages, the angle of the water mist nozzle can be as concentrated as possible to the middle of each carriage. In order to avoid uncontrolled diffusion of a large amount of smoke to non-fire carriages, the angle of the fireproof foam nozzle of the solid-state fireproof sealing ring can be as concentrated as possible to form a complete annular closed outer sealing ring in the shortest time, and the water mist in the carriages is used to prevent the smoke from diffusing through the interior of the carriages.

[0047] When the train catches fire and stops in the interval tunnel, the passengers in the fire carriage should be evacuated to the adjacent carriages as soon as possible. If it is an internal fire, the water mist nozzles in the fire carriage can be opened or a bottled fire extinguisher can be used for fire extinguishing; if it is an external fire or the smoke of the internal fire spreads outward, the outer water mist ring or the solid-state fireproof sealing ring on both sides of the fire carriage can be opened for fire control and fire extinguishing, so as to control the fire in one carriage as much as possible, and gain valuable time for passenger evacuation. If the fire continues to spread to a side carriage, the internal water mist nozzles and the adjacent outer water mist ring or solid-state fireproof sealing ring nozzles of the spreading carriage should be opened immediately to prevent high-temperature smoke from affecting passenger safety and fire spreading. For the full water mist ring scheme, when the passengers on one side have completed evacuation to the adjacent station and the right interval tunnel, and the passengers on the other side have not yet evacuated to the safe area, the station in the direction of the passengers who have not yet evacuated can be used to send fresh air to the passengers, and the other station can be used for exhaust. At this time, the full water mist ring can be opened, which is beneficial to temperature reduction, smoke reduction and fire control and fire extinguishing, so as to better protect the safety of the train, interval equipment and facilities and the interval structure.

[0048] With the increasing of signal system tracking ability, two trains will be in the same section in the morning and evening peak hours in Beijing, Shanghai, Guangzhou, Shenzhen and other subway. When the current train breaks down in the section and the head of the following train is on fire, if it is an internal fire, the passengers in front of the fire source should be evacuated to the evacuation platform immediately, then evacuated through the connecting channel as much as possible, the passengers behind the fire source should be evacuated to the rear carriage and the evacuation platform directly, then evacuated directly through the evacuation platform, when the passengers in the fire carriage are basically evacuated from the carriage, the fine water mist in the fire carriage should be started to extinguish the fire, if the smoke and fire spread to the inside and outside of other carriages, the fine water mist in the fire carriage and the fine water mist ring or solid fireproof sealing ring on both sides of the outside of the fire carriage should be started to control and extinguish the fire.

[0049] In order to deal with the external fire of the head and prevent the fire hazard of the fire smoke to the non-fire train, the spray head is installed at the lower part of the head at both ends of the train, which can form a fine water mist ring or a solid fireproof sealing ring between the train and the tunnel wall.

[0050] When the external fire occurs in the head, the adjacent fine water mist ring or solid fireproof sealing ring on both sides of the fire carriage should be started to cool, reduce smoke or insulate heat and smoke, at the same time, the passengers in the fire carriage should be evacuated away from the fire source, evacuated through the inside of the carriage first, then evacuated to the evacuation platform, then evacuated to the non-fire section tunnel and station through the connecting channel as much as possible. When the passengers in the fire carriage are basically evacuated from the carriage, the fine water mist in the fire carriage can be started to protect the inside of the carriage.

[0051] The utility model is described in detail through the embodiments, but the content is only the exemplary embodiment of the utility model, and cannot be considered to limit the implementation range of the utility model. The protection range of the utility model is limited by the claims. Any similar technical solution that achieves the above technical effect within the essence and protection range of the utility model, or any equivalent change and improvement of the application range, should still belong to the patent coverage protection range of the utility model. It should be noted that, in order to clearly express, the description of the utility model omits the expression of some components and processes which are not directly and obviously related to the protection range of the utility model but known by the person skilled in the art.

Claims

1. A fire rescue system for a tunnel train, characterized in that, The fire extinguishing system comprises a fire automatic alarm device, a pump group, a fire extinguishing medium storage tank, a zone valve group, a nozzle and a system connecting pipeline, the pump group and the fire extinguishing medium storage tank are arranged in a train carriage, a plurality of connected nozzles are arranged in a circular shape outside the train carriage connection part to form a ring-shaped nozzle group, which is used for spraying fire extinguishing medium between the train and the tunnel wall to control and extinguish fire, the nozzle is connected with the zone valve group, the zone valve group is connected with the pump group, the pump group is connected with the fire extinguishing medium storage tank, a set of fire extinguishing controller is arranged in each of the head carriage and the tail carriage cab, which is used for controlling the pump group and the zone valve group, and the fire automatic alarm device is arranged in each carriage.

2. The external fire rescue system for a tunnel train according to claim 1, wherein, The nozzles are arranged at the lower part of the head carriage and the tail carriage end.

3. The external fire rescue system for a section tunnel train according to claim 1 or 2, characterized in that, The fire extinguishing medium is water or expanded fireproof foam, the nozzles connected with the corresponding fire extinguishing medium storage tank are water mist nozzles or fireproof foam nozzles, and the ring-shaped nozzle group is composed of nozzles of the same type.

4. The external fire rescue system for a section tunnel train according to claim 3, wherein, The water mist nozzles and the fireproof foam nozzles are arranged at different positions of the train, and the water mist nozzles arranged at the carriage connection part can spray water mist towards both sides of the carriage.

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