Water discharge method of fire extinguishing equipment and fire extinguishing facility

Abstract

To provide a water discharge method of fire extinguishing equipment which can urge people in a guest seat part to evacuate not to be watered by discharged water in discharging water to a field part that is a protection range in a facility partitioned into the field part and the guest seat part, and a fire extinguishing facility.SOLUTION: A water discharge method of a fire extinguishing facility 9 related to the invention is for the fire extinguishing facility 9 which is installed in a facility partitioned into a field part 1 where a competition, performance, or the like is carried out and a guest seat part 3 for watching the competition, the performance, or the like and includes a rotating nozzle 7 for discharging water to fire that occurred in a protection range that is the field part 1. The water discharge method includes a shifting water discharge process for discharging water to a position in the field part 1 and away from the guest seat part 3 regardless of a fire breaking place by shifting the position in starting to discharge water when the fire breaks out and a real water discharge process for discharging water to a fire source by rotating toward the fire source while continuing water discharge after the shifting water discharge process.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water-discharging method for a fire extinguishing system equipped with a swivel nozzle for discharging water against a fire, and to the fire extinguishing system. [Background technology]

[0002] Fire extinguishing equipment equipped with a swiveling nozzle that swivels in the direction of a fire source and sprays water toward the fire source is installed in various facilities, and its protection range is determined in advance. For example, in facilities such as baseball stadiums, sports stadiums, and arenas that are divided into a field area where sports, performances, etc. take place and an audience area for watching the sports, performances, etc. on the field area, it is common for the field area to be set as the protection area. In addition, in facilities such as shopping malls that have an atrium with a multi-level structure surrounding the atrium, it is common for the floor of the atrium to be set as the protected area. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-258136 Summary of the Invention [Problem to be solved by the invention]

[0004] If a fire breaks out in such a facility, such as at the edge of the field of a baseball stadium, and a rotating nozzle is used to spray water at the fire, some of the water may end up falling on the stands (audience seating area). On the other hand, from the perspective of people in the stands, their area is separated from the field area by fences or other means, and they are on different floors, so they may feel less of a sense of danger about the fire and may become curious bystanders, gathering on the field side of the stands to watch the fire from the stands. If water spraying were to begin in this situation, there was a risk that some of the water would splash onto people in the stands, causing injury to them.

[0005] The present invention has been made to solve such problems, and aims to provide a water-discharging method for fire extinguishing equipment and a fire extinguishing equipment that, in a facility divided into a field area and an audience area, or in a facility where a multi-level structure is provided around an atrium, can encourage evacuation of people in the audience area or the multi-level structure without them getting wet when water is sprayed on the field area or the atrium, which are protected areas. [Means for solving the problem]

[0006] (1) The water discharge method of the fire extinguishing system according to the present invention is a water discharge method of fire extinguishing system that is installed in a facility divided into a field area where competitions, performances, etc. take place and an audience area for watching the competitions, performances, etc. in the field area, and has a swivel nozzle that discharges water against a fire that has occurred in the field area as a protected area, When a fire occurs and water discharge is started, a shifted water discharge process is performed to discharge water at a position in the field section away from the seating area, regardless of the location of the fire; This method is characterized by comprising a main water-discharging step in which, after the shifted water-discharging step, the device rotates toward the fire source while continuing to discharge water and discharges water toward the fire source.

[0007] (2) A water discharge method for a fire extinguishing system that is installed in a facility having an atrium and a multi-level structure around the atrium and has a swivel nozzle that discharges water against a fire that has occurred within a protected range that is the floor of the atrium, comprising: a shifted water discharge process for discharging water at a position on the floor section away from the floor structure section, regardless of the location of the fire, when a fire occurs and water discharge is started; This method is characterized by comprising a main water-discharging step in which, after the shifted water-discharging step, the device rotates toward the fire source while continuing to discharge water and discharges water onto the fire source.

[0008] (3) The fire extinguishing system according to the present invention comprises a fire detection device for detecting a fire, a swivel nozzle for rotating in a protection range and spraying extinguishing water, and a control unit for controlling the rotation and spraying of the swivel nozzle based on information from the fire detection device, The control unit is characterized in that, when fire detection information is input from the fire detection device, it rotates the nozzle toward a predetermined position unrelated to the location of the fire, performs a staggered water discharge at that position, and after a predetermined time has elapsed, it rotates the nozzle toward the location of the fire while continuing to spray water, and performs a main water discharge at the location of the fire.

[0009] (4) The fire extinguishing system according to the present invention includes a fire detection device for detecting a fire, a swivel nozzle for rotating within a protection range and spraying extinguishing water, and a control unit for controlling the rotation of the swivel nozzle based on fire location designation information for designating a location where a fire has occurred, The control unit is characterized in that, when the fire location designation information is input, it controls the nozzle to rotate toward a predetermined position unrelated to the location of the fire, perform a staggered water discharge at that position, and after a predetermined time has elapsed, it controls the nozzle to rotate toward the location of the fire while continuing to discharge water, and perform a main water discharge at the location of the fire.

[0010] (5) In addition, in the above (3) or (4), the facility is divided into a field area where the competitions, performances, etc. are held and an audience area for watching the competitions, performances, etc. in the field area, The swivel nozzle protects the field portion, The control unit is characterized in that it controls the swiveling nozzle to rotate toward a preset position in the field area away from the audience area, and to perform a staggered water discharge at that position.

[0011] (6) Furthermore, in the device described in (5) above, the offset water discharge is performed when spraying water on the location of the fire would result in some of the water falling on the audience area, and the control unit controls the swiveling nozzle to perform the main water discharge without offset water discharge when spraying water on the location of the fire would not result in some of the water falling on the audience area.

[0012] (7) Furthermore, in the above (3) or (4), the device is installed in a facility having an atrium and a multi-level structure around the atrium, The swivel nozzle protects the floor of the atrium section, The control unit is characterized in that it controls the swiveling nozzle to rotate toward a preset position on the floor portion away from the hierarchical structure portion, and to perform staggered water discharge at that position.

[0013] (8) Furthermore, in the device described in (7) above, the offset water discharge is performed when water is discharged at the location of the fire and some of the water falls on the hierarchical structure, and the control unit controls the swiveling nozzle to perform the main water discharge without offset water discharge when water is discharged at the location of the fire but not on the hierarchical structure. Effect of the Invention

[0014] In the present invention, when a fire occurs and water discharge is started, a shifted water discharge process is performed in which, regardless of the location of the fire, the device shifts its position to a position in the field area away from the spectator area and discharges water therefrom, and a main water discharge process is performed in which, after the shifted water discharge process, the device turns toward the fire source while continuing to discharge water and discharges water at the fire source.By using the shifted water discharge, people in the spectator area are made aware that water discharge has begun, and since the device turns toward the fire source while continuing to discharge water, people in the spectator area closer to the field are made aware that water is approaching, and are urged to evacuate to avoid getting wet or injured by the water discharge. In addition, in the present invention, when a fire occurs and water discharge is initiated, a shifted water discharge process is performed in which, regardless of the location of the fire, the floor of the atrium section is shifted to a position away from the multi-storey structure section and water is discharged from a shifted position, and after the shifted water discharge process, the main water discharge process is performed in which the device rotates toward the fire source while continuing to discharge water and discharges water at the fire source.By using the shifted water discharge, people in the multi-storey structure section are made aware that water discharge has begun, and the device further rotates toward the fire source while continuing to discharge water, so that people in the multi-storey structure section near the atrium are made aware that water discharge is approaching and are urged to evacuate to avoid getting wet or injured by the water discharge. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a diagram for explaining a water discharge method of the fire extinguishing equipment in accordance with the first embodiment, showing the water discharge range when the field portion of a stadium is set as the protected range. [Diagram 2] 4 is a diagram showing an example of a shifted water-discharging position and a main water-discharging position of a swivel nozzle in the first embodiment. FIG. [Diagram 3] FIG. 11 is a block diagram of a main configuration of a fire extinguishing system according to a second embodiment. [Figure 4] FIG. 11 is an explanatory diagram of an example of a water discharge method in the main water discharge of the fire extinguishing system according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [Embodiment 1] FIG. 1 is a plan view of a portion of a stadium 5 having a field area 1 and a seating area 3, and shows the area corresponding to the protection range of one swirl nozzle 7 of the fire extinguishing equipment installed in the stadium 5. The swirl nozzle 7 discharges fire extinguishing water, and the sector-shaped area shown in FIG. 1 is the protection area. In addition, different water discharge distances can be used, such as long-distance water discharge for discharging water at the farthest distance, intermediate water discharge for discharging water at a middle distance, and nearby water discharge for discharging water at a short distance.

[0017] The protection range of the swirl nozzle 7 is a sector-shaped area covering the field section 1, but as shown in FIG. 1, there are parts at the edges of the field section 1 where the water discharge range overlaps with the spectator seats. Therefore, as shown in Figure 1, if a fire breaks out in the field area 1 near the spectator seats on the right side of the figure, and there is a partition such as a fence between the location of the fire and the spectator seats, or if there is a difference in elevation, it is possible that some of the spectators who do not sense any danger will become curious bystanders and gather in the spectator seating area 3 closer to the location of the fire to watch the fire.

[0018] In this state, if the swivel nozzle 7 is aimed at the location of the fire and water spraying begins, some of the fire extinguishing water may splash onto people gathered in the auditorium 3 near the location of the fire, causing them to get wet or even get injured. Therefore, the water discharge method of the fire extinguishing equipment in this embodiment includes a shifted water discharge process in which, when a fire occurs and water discharge begins, the fire extinguishing equipment shifts its position to a position in the field section 1 away from the audience section 3 regardless of the location of the fire, and after the shifted water discharge process, the fire extinguishing equipment rotates toward the fire source while continuing to discharge water and discharges water at the fire source. Each step will be described in detail below.

[0019] <Shifting water discharge process> As described above, the shifted water discharge process is a process in which, when a fire occurs and water discharge begins, water is discharged from a shifted position to a position in the field area 1 away from the spectator area 3, regardless of the location of the fire. The location from which the staggered water discharge is performed is not particularly limited, as long as it is away from the spectator seating area 3 and is not splashed with fire extinguishing water even if there are people in the spectator seats. In the example shown in FIG. 1, the swivel angle of the swivel nozzle 7 is 108°. In this case, the offset water discharge position may be, for example, the center of the protection range, that is, 54° from either end.

[0020] If the offset water discharge position is located in the center of the protection range, as shown by the white arrows in Figure 1, regardless of whether the fire originates on either side of the offset water discharge position, the time required to rotate to the fire source position for the actual water discharge will not be extremely long. In addition, Figure 2 shows a case where the direction of the fire source is 32° to the right from the position of the offset water discharge. In this case, in this water discharge process, as shown in Figure 2, the swiveling nozzle 7 is rotated 32° to the right from the position where the offset water discharge was performed.

[0021] The offset water discharge process can be broken down into two processes: a nozzle rotation process in which the swiveling nozzle 7 is rotated from the standby position to a position where water is discharged, and a water discharge process in which water is discharged at the offset water discharge position. The duration of the water discharge process may be, for example, about 5 to 30 seconds.

[0022] In addition, when the water-discharge position and water-discharge time in the staggered water-discharge process are operated by a person, they can be appropriately decided by the operator, and when they are operated by a device as described below, they can be set in the device in advance depending on the location where the device is installed.

[0023] <Main water spraying process> This water discharge process is a process in which, after the staggered water discharge process, the swivel nozzle 7 is rotated toward the fire source while continuing to discharge water, and water is discharged toward the fire source. This water discharge process can be divided into a water discharge rotation process in which the swiveling nozzle 7 is rotated toward the fire source while continuing to discharge water after the staggered water discharge process, and a fire source water discharge process in which water is discharged toward the fire source.

[0024] In the water discharge rotation process, water discharge continues, so people watching the fire in the audience seating area 3 become aware of the start of water discharge when the staggered water discharge begins, and then realize that the water discharge is approaching. This makes people aware that if they remain in their place, water will be sprayed on them, and makes them aware of the need to leave the place.

[0025] By transitioning to the main water discharge process after the staggered water discharge process, people in the audience area 3 can be made aware that the water is approaching them, and at this point, people in the audience area 3 can be made aware of the need to evacuate. In other words, even if there is only a fire and the location of the fire is far away from the seating area 3 and no danger is felt, the risk of damage caused by the forceful water discharge can be sensed.

[0026] Then, when the fire source water discharge process starts, there will be no people in the audience seating area 3 where the water will be discharged, so that even if some of the water falls on the audience seating area 3, no people will be harmed. In this way, according to the water discharge method of the fire extinguishing equipment of this embodiment, in cases where the protected area is separated from the audience area 3 by a fence or the like, such as between the field area 1 and the audience area 3, or the protected area is on a floor below the audience area 3 due to floor differences, and people in the audience area 3 have low awareness of evacuating in the event of a fire breaking out within the protected area, it is possible to induce people in the audience area 3 to evacuate, thereby preventing damage caused by water discharge.

[0027] In addition, in this water-discharging process, the operation of identifying the fire source position and rotating the water-discharging nozzle relative to the fire source position may be performed by a person, as in the offset water-discharging process, or may be performed automatically by a device as described below.

[0028] <Other aspects> The above explanation was for a facility that is divided into a field area 1 where competitions, performances, etc. take place, and an audience area 3 for watching the competitions, performances, etc. in the field area 1, and where water is sprayed on a fire that occurs within the protected area, with the field area 1 being the protected area. However, this embodiment is not limited to the above case, and can also be applied to a fire extinguishing system that is installed in a facility, such as a shopping mall, which has an atrium and a multi-level structure around the atrium, and which uses the floor of the atrium as its protected area and sprays water on a fire that occurs within the protected area.

[0029] The water discharge method in such fire extinguishing equipment may include a shifted water discharge process in which, when a fire occurs and water discharge is started, the floor section is shifted to a position away from the multi-layered structure section and discharges water therefrom, regardless of the location of the fire, and a main water discharge process in which, after the shifted water discharge process, the equipment rotates toward the fire source while continuing to discharge water and discharges water at the fire source. The specific contents of the staggered water discharge process and the main water discharge process are the same as those of the fire extinguishing equipment installed in the facility having the field section 1 and the audience section 3 described above.

[0030] In addition, the offset water discharge process is performed when water is discharged at the location of the fire and some of the water will fall on the audience section 3, and this water discharge process may be performed without performing the offset water discharge process when water is discharged at the location of the fire and some of the water will not fall on the audience section 3.

[0031] [Embodiment 2] The first embodiment relates to a water-discharging method of fire extinguishing equipment, including cases where the method is operated by a human and cases where the method is performed automatically by a machine, while the present embodiment relates to a fire extinguishing equipment that can realize such a water-discharging method in the case where the method is performed automatically by a machine. For example, this relates to a fire extinguishing system that is installed in a facility that is divided into a field area 1 where competitions, performances, etc. take place and an audience area 3 for watching the competitions, performances, etc. in the field area 1, and that has a swivel nozzle 7 that sprays water on fires that occur within the field area 1 as its protected area.

[0032] And, as shown in FIG. 3, the fire extinguishing system 9 in this embodiment includes, for example, three swivel nozzles 7, a fire detection device 11 for detecting fires, and a control unit 13 for controlling the rotation and water discharge of the swivel nozzles 7 based on information from the fire detection device 11. Each component will be described in detail below. The fire extinguishing equipment 9 is equipped with various devices, such as a fire water tank for storing fire extinguishing water, a fire pump for pumping the fire extinguishing water, a start-up control panel for the fire pump, and a device for switching between automatic and manual operation of the swivel nozzle 7, but illustrations and descriptions of such general devices are omitted.

[0033] <Fire detection device> The fire detection device 11 detects a fire by detecting a protection range, and includes, for example, an infrared camera, an infrared camera control unit, and a rotation device for rotating the infrared camera. The fire detection device 11 rotates the infrared camera within the protection range, and the infrared camera control unit detects the presence or absence of a fire based on the image data. When the occurrence of a fire and its location are detected by the fire detection device 11, the information is input to the control unit 13.

[0034] <Control Unit> The control unit 13 controls the rotation and water discharge of the swivel nozzle 7 when fire detection information is input from the fire detection device 11. Specifically, the control unit 13 controls the swivel nozzle 7 as follows. When fire detection information is input, the nozzle is rotated toward a preset position in the field section 1 away from the seating section 3 regardless of the location of the fire, and a staggered water discharge is performed to discharge water at that position. Then, after a predetermined time has elapsed, the nozzle is rotated toward the location of the fire while continuing to discharge water, and the swiveling nozzle 7 is controlled so that a main water discharge is performed to discharge water at the location of the fire.

[0035] The time for which the shifted water discharge is performed at the preset position may be a time preset in the control unit 13, and may be, for example, about 5 to 30 seconds. When performing main water discharge on a fire source, the swivel nozzle 7 may be rotated slightly left and right to perform oscillating water discharge, as shown in Fig. 4. If the water discharge width without oscillation is 2 m, the water discharge width with oscillation will be, for example, about 6 m. Swinging water spray is effective when the fire is growing quickly.

[0036] According to the fire extinguishing equipment 9 of this embodiment, the fire extinguishing method described in embodiment 1 can be realized, and in cases where the protected area is separated from the audience area 3 by a fence or the like, such as between the field area 1 and the audience area 3, or the protected area is on a floor below the audience area 3 due to floor hierarchy, and people in the audience area 3 have low awareness of evacuating in the event of a fire breaking out within the protected area, it is possible to induce people in the audience area 3 to evacuate, and to prevent damage caused by water being sprayed on them.

[0037] In the above explanation, the control unit 13 controls the swivel nozzle 7 based on fire detection information from the fire detection device 11, but the control unit 13 of the present invention is not limited to this, and may input fire location designation information instead of fire detection information to control the rotation and water discharge of the swivel nozzle 7. Specifically, when fire location designation information is input, the control unit 13 controls the swivel nozzle 7 to rotate toward a predetermined position in the field section 1 away from the audience section 3 regardless of the location designated by the fire location designation information, perform a staggered water discharge at that position, and after a predetermined time has elapsed, rotate the swivel nozzle 7 toward the designated location while continuing to discharge water, and perform a main water discharge at the location of the fire.

[0038] The fire location designation information refers to the position information of the identified location when, for example, an operator specifies the location of a fire based on screen information such as a screen that displays the protection area.

[0039] <Other aspects> The above explanation was for a facility that is divided into a field area 1 where competitions, performances, etc. take place, and an audience area 3 for watching the competitions, performances, etc. in the field area 1, and where water is sprayed on a fire that occurs within the field area 1 as a protected area. However, this embodiment is not limited to the above case, and can also be applied to a fire extinguishing system 9 that is installed in a facility, such as a shopping mall, that has an atrium and has a multi-level structure around the atrium, and that uses the floor of the atrium as its protected area and sprays water on a fire that occurs within the protected area.

[0040] Such a fire extinguishing equipment 9 is configured to be installed in a facility having an atrium section and a hierarchical structure section around the atrium section, and is equipped with a swivel nozzle 7 that sprays water against a fire that has occurred within the protected area, with the floor of the atrium section being the protected area. When fire detection information or fire location designation information is input from a fire detection device 11, a control unit 13 that controls the rotation and water spraying of the swivel nozzle 7 controls the swivel nozzle 7 to rotate toward a predetermined position on the floor of the atrium section and away from the hierarchical structure section regardless of the location of the fire, to perform a shifted water spray at that position, and after a predetermined time has passed, to rotate the swivel nozzle 7 toward the location of the fire while continuing to spray water, and to perform a main water spray at the location of the fire.

[0041] In the above description, the control unit 13 always performs staggered water discharge when fire detection information or fire location designation information is input. However, the control unit 13 may control the swivel nozzle 7 to perform the main water discharge without performing the shifted water discharge when spraying water at the location of the fire would result in some of the water falling on the audience area 3 or the multi-level structure, and when spraying water at the location of the fire would not result in the water falling on the audience area 3 or the multi-level structure.

[0042] In this case, when fire detection information or fire location designation information is input, the control unit 13 will determine whether or not water will be sprayed based on the positional relationship between the seating area 3 and the multi-level structure. Therefore, the control unit 13 may set in advance an area where water will not be sprayed on the seating area 3 or the multi-level structure when water is sprayed within the protection range.

[0043] In addition, the staggered water discharge may be performed only in the case of long-distance water discharge or intermediate water discharge. In the case of nearby water discharge, although people may get wet if the water is sprayed on them, the water force is weak and the risk of injury is low, so it may be possible to prioritize discharging water to the fire source as soon as possible.

[0044] Furthermore, in this embodiment, examples of places where the fire extinguishing equipment 9 can be installed include a facility divided into a field area 1 where competitions, performances, etc. take place and an audience area 3 for watching the competitions, performances, etc. in the field area 1, and a facility having an atrium area with a hierarchical structure area provided around the atrium area. However, the facilities in which the fire extinguishing equipment 9 of the present invention can be installed are not limited to these, and the present invention can be widely applied to any facility where it is considered that there is a possibility that people may be harmed by water being sprayed suddenly at a fire source. [Explanation of symbols]

[0045] 1. Field Section 3 Audience seating area 5. Stadium 7 Swivel nozzle 9 Fire extinguishing equipment 11 Fire detection equipment 13 Control section

Claims

1. A water discharge method for a fire extinguishing system that is installed in a facility divided into a field section where competitions, performances, etc. take place and an audience section for watching the competitions, performances, etc. in the field section, and that has a swivel nozzle that discharges water against a fire that has occurred in the field section as a protected area, comprising: When a fire occurs and water discharge is started, a shifted water discharge process is performed to discharge water at a position in the field section away from the seating area, regardless of the location of the fire; This water-discharging method for a fire extinguishing system is characterized by comprising a main water-discharging process in which, after the offset water-discharging process, the fire extinguishing system rotates toward the fire source while continuing to discharge water and discharges water toward the fire source.

2. A water discharge method for a fire extinguishing system that is installed in a facility having an atrium and a multi-level structure around the atrium, and that has a swivel nozzle that discharges water against a fire that has occurred within a protected area that is a floor of the atrium, comprising: a shifted water discharge process for discharging water at a position on the floor section away from the floor structure section, regardless of the location of the fire, when a fire occurs and water discharge is started; This water-discharging method for a fire extinguishing system is characterized by comprising a main water-discharging process in which, after the offset water-discharging process, the fire extinguishing system rotates toward the fire source while continuing to discharge water and discharges water toward the fire source.

3. The fire detection device detects a fire, a swivel nozzle rotates in a protection range and sprays fire extinguishing water, and a control unit controls the rotation and spraying of the swivel nozzle based on information from the fire detection device, The control unit, when receiving fire detection information from a fire detection device, controls the nozzle to rotate toward a preset position unrelated to the location of the fire, perform a staggered water discharge at that position, and after a predetermined time has elapsed, rotate the nozzle toward the location of the fire while continuing to discharge water, and perform a main water discharge at the location of the fire.

4. The present invention is provided with a fire detection device for detecting a fire, a swivel nozzle for rotating within a protection range and discharging fire extinguishing water, and a control unit for controlling the rotation of the swivel nozzle based on fire location designation information for designating a location where a fire has occurred, The control unit controls the fire extinguishing equipment so that, when the fire location designation information is input, the nozzle rotates toward a preset position unrelated to the location of the fire, performs a staggered water discharge at that position, and after a predetermined time has elapsed, the nozzle rotates toward the location of the fire while continuing to discharge water, and performs a main water discharge at the location of the fire.

5. The facility is divided into a field area where competitions and performances take place and an audience area for watching the competitions and performances in the field area. The swivel nozzle protects the field portion, The fire extinguishing equipment according to claim 3 or 4, characterized in that the control unit controls the swiveling nozzle to rotate toward a preset position in the field area away from the audience area, and to perform a staggered water discharge at that position.

6. The fire extinguishing equipment described in claim 5, characterized in that the shifted water discharge is performed when water is discharged at the location of the fire and some of the water falls on the audience area, and the control unit controls the swivel nozzle to perform the main water discharge without shifted water discharge when water is discharged at the location of the fire but does not fall on the audience area.

7. The system is installed in a facility having an atrium section and a multi-level structure section provided around the atrium section, The swirl nozzle protects the floor of the atrium section, The fire extinguishing equipment according to claim 3 or 4, characterized in that the control unit controls the swiveling nozzle to rotate toward a predetermined position on the floor portion away from the hierarchical structure portion, and to perform a staggered water discharge at that position.

8. The fire extinguishing equipment described in claim 7, characterized in that the shifted water discharge is performed when part of the water discharged at the location of the fire falls on the hierarchical structure, and the control unit controls the swivel nozzle to perform the main water discharge without shifted water discharge when water is discharged at the location of the fire but not on the hierarchical structure.

Images