Evacuation guidance presentation system, evacuation guidance presentation method, program, and disaster prevention system

Abstract

An evacuation guidance presentation system (10) provides evacuation guidance by presenting an evacuation route when a fire occurs in a facility, and is provided with: a calculation unit (11) that calculates, for each unit space of a plurality of unit spaces that virtually divide a facility, a spatial risk value for the unit space on the basis of a function of the time it takes for smoke to reach the unit space from the point where a fire occurs; a determination unit (12) that determines an optimal evacuation route, which is the evacuation route for which the sum of the spatial risk values for one or more unit spaces passed through in the evacuation route is the smallest among a plurality of evacuation routes in the facility; and a presentation unit (13) that presents the evacuation route determined as the optimal evacuation route by the determination unit (12).

Description

Evacuation guidance presentation system, evacuation guidance presentation method, program, and disaster prevention system

[0001] The present invention relates to an evacuation guidance presentation system, an evacuation guidance presentation method, a disaster prevention system including the evacuation guidance presentation system, and a program.

[0002] BACKGROUND ART Conventionally, there has been progress in the development of technology for supporting the safe evacuation of disaster victims in the event of a disaster such as a fire by automatically generating evacuation routes (also called evacuation paths) (see, for example, Patent Document 1).

[0003] JP 2010-5292 A

[0004] However, in conventional evacuation support technologies, the generated evacuation routes were sometimes inappropriate. The present invention provides an evacuation guidance presentation system and the like that generates and presents more appropriate evacuation routes, thereby supporting safer evacuation.

[0005] An evacuation guidance presentation system according to one aspect of the present invention is an evacuation guidance presentation system that provides evacuation guidance by presenting evacuation routes in the event of a fire in a facility, and includes: a calculation unit that calculates a spatial hazard value for each of a plurality of unit spaces that virtually divide the facility, based on a function of the time it takes for smoke to reach the unit space from the point where the fire breaks out; a determination unit that determines an optimal evacuation route, of a plurality of evacuation routes in the facility, which is the evacuation route that has the smallest sum of the spatial hazard values ​​of one or more unit spaces that the evacuation route passes through; and a presentation unit that presents the evacuation route determined as the optimal evacuation route by the determination unit.

[0006] An evacuation guidance presentation method according to one aspect of the present invention is a computer-executed evacuation guidance presentation method for providing evacuation guidance by presenting evacuation routes in the event of a fire in a facility, the method calculating a spatial hazard value for each of a plurality of unit spaces that virtually divide the facility based on a function of the time it takes for smoke to reach the unit space from the point at which the fire breaks out, determining an optimal evacuation route from among a plurality of evacuation routes in the facility, which is the evacuation route that has the smallest sum of the spatial hazard values ​​of one or more unit spaces that are passed through on the evacuation route, and presenting the evacuation route determined to be the optimal evacuation route.

[0007] A program according to one aspect of the present invention is a program for causing a computer to execute the evacuation guidance presentation method described above.

[0008] A disaster prevention system according to one aspect of the present invention includes the evacuation guidance presentation system described above and the plurality of sensors provided in the facility.

[0009] According to the present invention, an evacuation guidance presentation system and the like that supports safer evacuation are provided.

[0010] Fig. 1 is a block diagram showing a functional configuration of an evacuation guidance presentation system according to an embodiment. Fig. 2 is a flowchart showing an example of the operation of the evacuation guidance presentation system according to an embodiment. Fig. 3 is a diagram for explaining the time it takes for smoke to arrive according to an embodiment. Fig. 4 is a diagram for explaining the determination of an optimal evacuation route according to an embodiment. Fig. 5 is a diagram showing an example of presentation of an evacuation route according to an embodiment.

[0011] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0012] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0013] (Embodiments) First, an overview of an evacuation guidance presentation system and a disaster prevention system according to embodiments will be described. The disaster prevention system of the present invention detects the occurrence of a disaster, such as a fire, based on detection results from sensors installed in a facility, and provides evacuation guidance by presenting an evacuation route from the current floor to an off-floor location using the time it takes for smoke to arrive from the fire's point. In other words, the disaster prevention system generates and outputs an appropriate evacuation route based on the time it takes for smoke to arrive. Herein, the disaster prevention system and evacuation guidance presentation system of the present invention do not take into account movement between floors. Movement between floors means, for example, movement from the second floor to the first floor. In the present invention, an evacuation route is generated from the floor where the disaster victim is currently located to an off-floor location, i.e., from the victim's current location within the floor to an emergency staircase or emergency exit (including a connecting exit to another floor on the same floor indoors or an exit to the outdoors) on that floor. Hereinafter, emergency staircases and emergency exits are collectively referred to as an exit from a floor or simply an exit.

[0014] When generating an evacuation route, the evacuation guidance presentation system comprehensively considers the risk levels of the entire route from the current location to the exit and determines the evacuation route with the lowest risk level, i.e., the optimal evacuation route. For this reason, the evacuation guidance presentation system can present the route with the lowest risk by calculating the risk level of the entire route for each of multiple evacuation routes from the current location to the exit. This is a different concept from when an evacuation route from the current location branches and the system simply selects the branch with the lowest partial risk level to generate and output an evacuation route. This point will be explained in more detail later.

[0015] 1 is a block diagram showing the functional configuration of an evacuation guidance presentation system according to an embodiment. As shown in FIG. 1, the evacuation guidance presentation system 10 is incorporated into the disaster prevention system 50 as part of the disaster prevention system 50. The function of the evacuation guidance presentation system 10 is to generate an evacuation route based on the time it takes for smoke to arrive from the point of a fire and present the route on the guidance UI 22. In other words, the evacuation guidance presentation system 10 is responsible for the information processing part of the disaster prevention system 50 for presenting the evacuation route.

[0016] The disaster prevention system 50 includes a sensor 21 and a guidance UI 22 in addition to the evacuation guidance presentation system 10. The disaster prevention system 50 may be realized as a system connected to an external guidance UI device and configured only with the evacuation guidance presentation system 10 and the sensor 21, or may be realized as a system connected to an external sensor device and configured only with the evacuation guidance presentation system 10 and the guidance UI 22.

[0017] The sensors 21 included in the disaster prevention system 50 include, for example, smoke detectors and heat detectors that detect smoke density values ​​during a fire, detectors for detecting concentrations of predetermined components such as carbon monoxide or carbon dioxide, image sensors such as cameras that detect the presence or absence of fires or collapses, seismic intensity detectors that detect seismic intensity during an earthquake, and illuminance detectors that quantify the visibility of evacuation routes. In the following description, the sensors 21 will be described as detectors that detect smoke density values.

[0018] The guidance UI 22 included in the disaster prevention system 50 may be configured with any device that can present evacuation routes (i.e., notify disaster victims) by presenting at least one of auditory and visual information. Examples of the guidance UI 22 include an audio output speaker, a flashing light guidance device (a device in which multiple light points emit light at different times, making it appear as if the light is traveling in the guidance direction), and an image display device such as a digital signage or a tablet terminal.

[0019] The evacuation guidance presentation system 10 includes a calculation unit 11, a determination unit 12, and a presentation unit 13. The evacuation guidance presentation system 10 is realized by a computer that performs the functions of the information processing unit as described above. The evacuation guidance presentation system 10 may be realized, for example, by a virtual cloud computer built on a network, or by an edge computer installed in a facility or another facility connected to the facility via a communication line.

[0020] The calculation unit 11 acquires detection results from the sensor 21 and calculates a spatial risk value indicating the risk of spaces passing through on an evacuation route based on the time it takes for smoke to arrive from the fire outbreak point. More specifically, if the entire floor of a facility is virtually divided into multiple spaces, an evacuation route is configured so that the evacuation route passes through several of the spaces (hereinafter referred to as unit spaces) that make up the unit spaces. Conversely, the evacuation route includes multiple unit spaces that are passed through on the route. A plurality of sensors 21 are provided overall, one for each unit space, so that each unit space can be detected. Furthermore, the sensors 21 are configured to be capable of sensing within the unit spaces. In other words, the unit spaces correspond to areas detectable by the sensors 21. There are no particular limitations on the size of the unit spaces or their positional relationship with the sensors 21. For example, the unit spaces may correspond to the detection zones defined by the Fire Service Act, or may correspond to a 30 m x 30 m area that corresponds to the standards for installing sensors in corridors and passageways defined by the Fire Service Act.

[0021] On the other hand, it is not essential to provide such a sensor 21 for each unit space. For example, only sensors 21 capable of sensing at the point where a fire occurs may be provided, and sensors 21 may not be provided in other unit spaces. If it is possible to identify points where fires are likely to occur, sensors 21 may be provided only in those points, and sensors 21 may not be provided in other points. However, if it is not possible to identify points where fires are likely to occur, sensors 21 may be provided in all points (i.e., all unit spaces).

[0022] The spatial hazard value is calculated from the time it takes for smoke to reach a unit space from the point of fire at that time, and is a numerical value indicating the degree of danger of a disaster victim passing through that unit space. Because the spatial hazard value changes from moment to moment, it may be calculated as an estimate of the time (i.e., future) at which a disaster victim may pass, for example, using the spatial hazard value at that time and past spatial hazard values. As described above, each unit space is individually equipped with a sensor 21, and the calculation unit 11 calculates the spatial hazard value using each of the multiple sensors 21. A communication line is formed between the calculation unit 11 and the sensors 21 to exchange the detection results of the sensors 21. In addition to the calculation unit 11 and the sensors 21, other devices such as a transceiver and a gateway may be interposed in this communication line.

[0023] The calculation unit 11 calculates a spatial danger level value by algorithm calculation from the acquired time it takes for smoke to reach the location of the fire. The detailed operation of the calculation unit 11 will be described later together with the operation of the evacuation guidance presentation system 10.

[0024] The determination unit 12 determines an optimal evacuation route that is the most suitable evacuation route from among a plurality of evacuation routes using the spatial hazard level values ​​calculated by the calculation unit 11. Determining an optimal evacuation route means selecting, from among the plurality of evacuation routes, an evacuation route that minimizes the sum of spatial hazard levels of all unit spaces included in the evacuation route, i.e., all routes, obtained by adding up the spatial hazard levels of the unit spaces passed through on each evacuation route.

[0025] The presentation unit 13 causes the guidance UI 22 to present the evacuation route determined by the determination unit 12 as the optimal evacuation route. In this example, the evacuation route is described as being presented using an image. However, as described above, the presentation unit 13 may be appropriately configured according to the manner of presentation of the evacuation route. The presentation unit 13 obtains information about the evacuation route determined as the optimal evacuation route, overlays it on a floor map stored in advance (e.g., in a storage unit), and generates an image. The presentation unit 13 then outputs the generated image and displays it on the guidance UI 22. Note that a communication line is formed between the presentation unit 13 and the guidance UI 22 for exchanging the generated image. In addition to the presentation unit 13 and the guidance UI 22, other devices such as a transceiver and a gateway may be interposed in this communication line.

[0026] Next, the operation of the disaster prevention system 50, particularly the evacuation guidance presentation system 10, will be described with reference to Fig. 2. Fig. 2 is a flowchart showing an example of the operation of the evacuation guidance presentation system according to the embodiment.

[0027] First, the sensor 21 constantly senses smoke density values ​​and transmits the smoke density values ​​to the calculation unit 11. The calculation unit 11 acquires the smoke density values ​​as the detection results (S101) and calculates the spatial danger value of the unit space in which the sensor 21 is installed at that time as a function of the smoke arrival time (S102). Here, the calculation of the spatial danger value will be explained with reference to FIG. 3.

[0028] In this embodiment, the calculation unit 11 calculates the spatial risk value based on the smoke front velocity u ｆ and the path length of the smoke propagation path from the fire outbreak point. Specifically, as shown in Figure 3, smoke is generated from the fire outbreak point with a predetermined amount of smoke, and the smoke propagates horizontally along the ceiling. The smoke front velocity u ｆ can be calculated by the following formula (1).

[0029]

[0030] In equation (1), Δρ is the density difference between the smoke and the surrounding fluid (unit: kg / m ３ ), g represents the gravitational acceleration, and Q０ is the amount of smoke inflow at the point where the fire started (unit: m ３ / s), and ρ ｓ is the smoke density (unit: kg / m ３ ) and b indicates the passage width of the route (unit: m).

[0031] In this embodiment, evacuation routes are presented that do not pass through habitable rooms and that pass only through corridors. This is because situations in which it is necessary to use habitable rooms that are likely to become dead ends are rare, and because the boundary between a habitable room and a corridor usually has a wall between the ceiling and the doorway. Therefore, in order to calculate the spatial risk value of a habitable room, the smoke height must be reduced by the amount of the wall. To take such situations into account, three-dimensional spatial information about the facility is required. This requires the use of three-dimensional spatial information in the calculation, which immediately results in a huge amount of computational processing. In other words, from the perspective of computational processing, it is effective to calculate an evacuation route that passes only through corridors.

[0032] According to the above-mentioned concept, the passage width b of the route does not have an extremely variable passage width such as an entrance or exit of a room, so it can be calculated as a constant width using, for example, a representative value of the passage width within the route to be calculated, for example, the average width b1. ｓ The density difference Δρ between the smoke and the surrounding fluid can also be approximated as a constant if not treated strictly. ｓAlthough it is possible to calculate the density difference Δρ between the smoke and the surrounding fluid as exact numerical values, as described above, it is preferable to approximate these variables as constants from the perspective of computational processing volume. Furthermore, in this embodiment, the spatial hazard value is calculated based on the smoke front velocity at the fire outbreak point and the path length and passage width of the smoke propagation path, so the influence of the smoke height direction is not taken into account. As a result, the spatial hazard value can be calculated without using three-dimensional spatial information of the floor in the calculation, making it possible to significantly reduce the computational processing volume. In an emergency situation such as evacuating a fire, every second counts, and there is no time to perform calculations that require a large amount of processing volume. Therefore, an evacuation route with reduced computational processing volume can be said to be more realistic.

[0033] As described above, a representative value (for example, width b1) is used as the passage width, and the smoke density ρ ｓ and the density difference Δρ between the smoke and the surrounding fluid is approximated as a constant, equation (1) can be expressed as the smoke tip velocity u ｆ is the passage width b1 and the smoke inflow amount Q ０ This can be transformed into an equation that shows that the smoke front velocity u ｆ is treated as the same as the horizontal propagation speed of smoke. Therefore, the horizontal propagation speed of smoke is calculated by the smoke inflow Q ０ It is proportional to the cube root of

[0034] On the other hand, factors that have a significant impact on the horizontal propagation speed of smoke along a route and are too significant to be ignored include branching paths in the route involved in the exhaust of smoke, and smoke exhaust mechanisms such as smoke exhaust devices and ventilation systems. For example, if a branching path exists on the route from the point of fire outbreak to the target unit space, smoke will be distributed to the branching path as well, thereby reducing the horizontal propagation speed of smoke. Alternatively, if a merging path from other routes exists on the route from the point of fire outbreak to the target unit space, smoke from the other routes will merge, thereby increasing the horizontal propagation speed of smoke. In this embodiment, the calculation unit 11 increases or decreases the horizontal propagation speed depending on such branching paths and merging paths.

[0035] Specifically, when there is a branch on the route from the fire outbreak point to the target unit space, the calculation unit 11 assumes that the passage width has increased by the branched route, and performs calculation by replacing b in formula (1). For example, if smoke is distributed to other routes with the same passage width at the branched route, the calculation unit 11 calculates the smoke inflow amount Q ０ From Q ０ / 2 to calculate the horizontal propagation velocity. Similarly, if there is a merging path on the path from the fire outbreak point to the target unit space, the calculation unit 11 assumes that the path width is reduced by the width of the other merging path, and performs calculations by replacing b in the formula (1). For example, if smoke merges at a branching path from another path with the same path width, the calculation unit 11 calculates the smoke inflow amount as Q ０ From 2Q ０ and calculate equation (1) to calculate the horizontal propagation velocity.

[0036] On the other hand, if there is a smoke exhaust system on the route from the fire outbreak point to the target unit space, the horizontal propagation speed of smoke will be reduced according to the operation capacity determined by the system's performance and installation height. Operation capacity is the amount of smoke reduction relative to the amount of smoke inflow, and Q Ｅ Specifically, when a smoke exhaust mechanism is present on the path from the fire outbreak point to the target unit space, the calculation unit 11 calculates the operation performance Q Ｅ Considering that the amount of smoke inflow has decreased by the amount of Q in equation (1), ０ For example, the calculation unit 11 calculates the operating performance Q Ｅ If a smoke exhaust mechanism of Q exists on the route, ０ (Q ０ -Q Ｅ ) and calculate the horizontal propagation velocity using equation (1).

[0037] Here, the smoke inflow Q ０ can be considered as the amount of smoke (smoke amount) generated only at the point where the fire started, when there are no other sources of smoke, such as in the early stages of the fire. Such a smoke amount is V, defined by the following equation (2): ｓ It is calculated using the value.

[0038]

[0039] In formula (2), α ｆ is the area of ​​1 m of loaded combustible materials in the space including the point of fire outbreak (hereafter referred to as the living space). ２ Heat generation amount per unit q ｌ The values ​​shown correspond to the amount of heat generated q ｌ is 170 (mJ / m ２ ) In the following cases, α ｆ = 0.0125, and the calorific value q ｌ is 170 (mJ / m ２ ), then α ｆ = 2.6 x 10 －６ q ｌ ^(5 / 3).

[0040] In addition, in formula (2), α ｍ is a value determined according to the type of finish on the interior-facing wall and ceiling of the room including the point of fire outbreak. If the wall and ceiling are finished with non-combustible materials, α ｍ = 0.0035, and if the walls and ceilings are finished as specified in Article 128-5 (Interior of Special Buildings, etc.) Paragraph 1, Item 2 of the Enforcement Order of the Building Standards Act, α ｍ = 0.014, and if the walls and ceilings are finished as specified in Article 128-5 (Interior of Special Buildings, etc.) Paragraph 1, Item 1 of the Enforcement Order of the Building Standards Act, α ｍ = 0.056, and if the walls and ceiling are finished with wood or similar materials, α ｍ = 0.35.

[0041] In addition, in formula (2), A ｒｏｏｍ is the floor area of ​​the room (unit: m ２ ), and H ｌｏｗ indicates the average ceiling height (unit: m) from the lowest point of the floor of the room, and H ｒｏｏｍ indicates the average ceiling height (unit: m) from the reference point of the room.

[0042] Calculated V ｓ The value may be treated as the amount of smoke generated as it is, but it may differ from the amount of smoke generated estimated from the detection result actually detected by the sensor 21 or the like. ｓThe amount of smoke to be used in the calculation is determined by taking into consideration the detection result together with the value. For example, V ｓ If the detection result corresponds to a larger amount of smoke than the value, V ｓ By multiplying the value by a coefficient or adding a predetermined number, V ｓ The amount of smoke generated is determined by the value, for example, V ｓ If the detection result corresponds to a smaller amount of smoke than the value, V ｓ By dividing the value by a coefficient or subtracting a predetermined number, V ｓ The amount of smoke produced that has decreased from the value is determined.

[0043] In this way, V ｓ The smoke amount is determined based on the value and the detection result, and the determined smoke amount is calculated as the smoke inflow amount Q ０ The calculation unit 11 calculates Equation (1) using the formula (1). In this calculation, the horizontal propagation speed for the route is calculated by treating approximable variables as constants as much as possible, while taking into account branching and merging roads on the route and the smoke exhaust mechanism, thereby reducing the amount of calculation processing. The calculation unit 11 calculates the time it takes for smoke to reach a unit space using the calculated horizontal propagation speed and the path length of the route. Since this time needs to be converted into a spatial hazard value for the unit space, the calculation unit 11 also has a conversion function for converting the smoke arrival time into a spatial hazard value. For example, the calculation unit 11 calculates the spatial hazard value by taking the reciprocal of the calculated smoke arrival time. This conversion function is an example, and the calculation unit 11 is not particularly limited in its conversion format as long as it has a conversion function that calculates a lower spatial hazard value the longer the given smoke arrival time is, and calculates a higher spatial hazard value the shorter the given smoke arrival time is.

[0044] Returning to FIG. 2 , after the spatial risk value is calculated, the determination unit 12 determines the optimal evacuation route (S103). First, the determination unit 12 acquires the calculated spatial risk value. Then, using the spatial risk value, the determination unit 12 calculates the sum of the spatial risk values ​​for each of multiple evacuation routes across all routes. An example will be described using FIG. 4 . FIG. 4 is a diagram for explaining the determination of the optimal evacuation route in the embodiment. In FIG. 4 , the outermost rectangle indicates a floor within a facility, and hatched areas indicate impassable spaces (such as living rooms and storage spaces). S1 to S16 each represent a sensor. The floor has exits at the lower end and on both the left and right sides of the page. Evacuation routes are presented, starting from the position of sensor S1 and heading toward one of the exits. A fire has occurred near sensor S4. The spatial risk values ​​based on the time it takes for smoke to arrive in each unit space are as follows:

[0045] Near sensor S1: 0.020 Near sensor S2: 0.025 Near sensor S3: 0.200 Near sensor S4: 2.000 Near sensor S5: 0.020 Near sensor S6: 0.020 Near sensor S7: 0.030 Near sensor S8: 0.500 Near sensor S9: 0.015 Near sensor S10: 0.020 Near sensor S11: 0.025 Near sensor S12: 0.020 Near sensor S13: 0.005 Near sensor S14: 0.015 Near sensor S15: 0.020 Near sensor S16: 0.010

[0046] For example, the evacuation route indicated by the solid arrows in Figure 4 passes near sensors S1, S2, S6, S7, S11, S15, and S16. Therefore, the sum of the spatial risk values ​​is 0.150. On the other hand, the evacuation route indicated by the dashed arrows in Figure 4 passes near sensors S1, S2, S6, S5, S9, S10, S11, S15, S14, and S13. Therefore, the sum of the spatial risk values ​​is 0.185. At first glance, the evacuation route indicated by the dashed arrows, which selects the branch farthest from the sensor S4 where the fire originated, appears to be the safest evacuation route. However, in reality, there are many spaces that must be traversed before reaching the exit, and the sum of the spatial risk values ​​is accordingly large. In reality, it is clear that evacuating via the evacuation route indicated by the solid arrows has a lower overall risk, even if it means getting closer to the sensor S4.

[0047] In this way, in this example, by comparing the sum of spatial risk values ​​across all evacuation routes, it is possible to select a more appropriate evacuation route and support safer evacuation.

[0048] Returning to FIG. 2 , after determining the optimal evacuation route, the presentation unit 13 presents the evacuation route (S104). The presentation unit acquires information about the evacuation route determined to be the optimal evacuation route and generates an image for presenting the evacuation route by overlaying it on a floor map. The image is then output to and displayed on the guidance UI 22, thereby presenting the evacuation route. An example is shown in FIG. 5 . FIG. 5 is a diagram illustrating an example of evacuation route presentation in an embodiment. FIG. 5 shows the appearance of the guidance UI 22 and an image displayed on the screen. As shown in FIG. 5 , in this example, in addition to the evacuation route superimposed on the floor map, the time of the fire outbreak, information identifying the location of the fire, an image of the current location of the fire, the number of victims stranded on the floor, and an inquiry button for inquiring about the floor manager are displayed. Therefore, a configuration for detecting the fire itself, capturing images, counting the number of victims, registering the floor manager, and establishing a communication line may be provided.

[0049] [Effects, etc.] As described above, the evacuation guidance presentation system 10 according to the first aspect is an evacuation guidance presentation system 10 that provides evacuation guidance by presenting evacuation routes in the event of a fire in a facility, and includes: a calculation unit 11 that calculates, for each of a plurality of unit spaces that virtually divide the facility, a spatial hazard value for that unit space based on a function of the time it takes for smoke to reach that unit space from the point where the fire breaks out; a determination unit 12 that determines, among the plurality of evacuation routes in the facility, an optimal evacuation route that is the evacuation route that minimizes the sum of the spatial hazard values ​​of one or more unit spaces that are passed through on that evacuation route; and a presentation unit 13 that presents the evacuation route determined as the optimal evacuation route by the determination unit 12.

[0050] This allows the system to present, from among several candidate evacuation routes, the evacuation route with the smallest sum of the spatial danger values ​​of one or more unit spaces passed through on the way to the exit, based on the time it takes for smoke to reach the unit space, i.e., the danger level for each unit space. In this way, the evacuation guidance presentation system 10 can be realized, which supports safer evacuation by reducing the overall danger level of the evacuation route. Furthermore, to calculate the spatial danger value, only the time it takes for smoke to reach the unit space, i.e., the speed of the smoke, and the path length of the smoke propagation path need to be provided. Because this information can be obtained from a plan view of the floor from above, it is possible to suppress the increase in computational processing volume, such as using three-dimensional spatial information. As a result, the time required for computational processing can be easily reduced, allowing the system to quickly present evacuation routes and support safer evacuation in terms of computational processing volume.

[0051] In addition, the evacuation guidance presentation system 10 according to the second aspect is the evacuation guidance presentation system 10 described in the first aspect, in which the calculation unit 11 acquires detection results from each of a plurality of sensors 21 installed in each unit space, and calculates a spatial danger value for each of the plurality of unit spaces from the acquired detection results.

[0052] This makes it possible to calculate a spatial danger value based on the detection results obtained from the sensor 21. For example, when an estimated value of the amount of smoke generated is used in calculating the spatial danger value, the actual detection results can be used together with the estimated value, making it possible to present an evacuation route based on a more reliable spatial danger value.

[0053] The evacuation guidance presentation system 10 according to a third aspect is the evacuation guidance presentation system 10 according to the second aspect, in which the sensor 21 is a detector.

[0054] This makes it possible to calculate the spatial risk value based on the detection results obtained from the detector serving as the sensor 21 as well.

[0055] Further, the evacuation guidance presentation system 10 according to a fourth aspect is the evacuation guidance presentation system 10 according to the second or third aspect, in which the calculation unit 11 calculates the amount of smoke at the point where the fire has occurred by V ｓ The spatial risk level value for each of the plurality of unit spaces is calculated based on the determined amount of smoke emitted and the amount of change over time in the acquired detection results.

[0056] According to this, V calculated by equation (2) ｓ The amount of smoke generated can be determined based on the value and the amount of change over time in the acquired detection results, and the spatial hazard value can be calculated based on the amount of smoke generated.

[0057] Furthermore, the evacuation guidance presentation system 10 according to a fifth aspect is the evacuation guidance presentation system 10 according to any one of the first to fourth aspects, in which the calculation unit 11 calculates the time it takes for the smoke to arrive based on the path length and horizontal propagation speed of the path the smoke takes from the point where the fire started to the unit space, and the horizontal propagation speed is proportional to the cube root of the amount of smoke at the point where the fire started.

[0058] This allows the time it takes for smoke to arrive to be calculated from the path length and horizontal propagation speed of the path the smoke takes from the point where the fire started to the unit space.

[0059] Furthermore, the evacuation guidance presentation system 10 according to a sixth aspect is the evacuation guidance presentation system 10 described in any one of the first to fifth aspects, and each of the multiple evacuation routes is a route leading to an emergency staircase or to the outdoors.

[0060] This makes it possible to present an evacuation route that is a route leading to an emergency staircase or outdoors.

[0061] In addition, the evacuation guidance presentation system 10 according to the seventh aspect is the evacuation guidance presentation system 10 described in any one of the first to sixth aspects, in which the presentation unit 13 presents the optimal evacuation route using at least one of sound, flashing light, and signage.

[0062] This allows evacuation routes to be presented using at least one of audio, flashing lights, and signage.

[0063] Furthermore, the evacuation guidance presentation system 10 according to the eighth aspect is the evacuation guidance presentation system 10 described in the fifth aspect, in which the calculation unit 11 reduces the horizontal propagation speed in accordance with the branching paths that exist on the route from the point where the fire occurred to the unit space.

[0064] According to this, if there is a branch path that has the effect of reducing the horizontal propagation speed on the route from the point where the fire occurred to the unit space, the horizontal propagation speed can be reduced in accordance with such a situation.

[0065] Furthermore, the evacuation guidance presentation system 10 according to the ninth aspect is the evacuation guidance presentation system 10 described in the fifth aspect, in which the calculation unit 11 reduces the horizontal propagation speed in accordance with the smoke exhaust mechanism present on the path from the point where the fire occurred to the unit space.

[0066] According to this, if a smoke exhaust mechanism that has the effect of reducing the horizontal propagation velocity is present on the route from the point where the fire started to the unit space in question, the horizontal propagation velocity can be reduced in accordance with such circumstances.

[0067] Furthermore, the evacuation guidance presentation method according to a tenth aspect is a computer-executed evacuation guidance presentation method for providing evacuation guidance by presenting evacuation routes in the event of a fire in a facility, the method calculating a spatial hazard value for each of a plurality of unit spaces that virtually divide the facility based on a function of the time it takes for smoke to reach the unit space from the point of fire outbreak, determining an optimal evacuation route from among the plurality of evacuation routes in the facility, which is the evacuation route that has the smallest sum of the spatial hazard values ​​of one or more unit spaces that the evacuation route passes through, and presenting the evacuation route determined to be the optimal evacuation route.

[0068] This provides the same effect as the evacuation guidance presentation system 10 .

[0069] A program according to an eleventh aspect is a program for causing a computer to execute the evacuation guidance presentation method according to the tenth aspect.

[0070] This makes it possible to achieve the same effect as the evacuation guidance presentation system 10 using a computer.

[0071] In addition, the disaster prevention system according to the twelfth aspect includes an evacuation guidance presentation system 10 described in any one of the second aspect, the third aspect, and the fourth to ninth aspects that cite the second aspect, and a plurality of sensors 21 installed in the facility.

[0072] This makes it possible to realize a disaster prevention system 50 that has the same effects as the evacuation guidance presentation system 10.

[0073] (Other Embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0074] For example, in the above-described embodiment, the evacuation guidance presentation system is realized by a plurality of devices, modules, etc. In this case, the components of the evacuation guidance presentation system described in the above-described embodiment may be distributed in any manner among the plurality of devices, modules, etc. Furthermore, the evacuation guidance presentation system may be realized as a single device.

[0075] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0076] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0077] Furthermore, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0078] Furthermore, the general or specific aspects of the present invention may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0079] For example, the present invention may be realized as the disaster prevention system of the above-described embodiment. Furthermore, the present invention may be realized as a method executed by at least a part of a processor of the evacuation guidance presentation system of the above-described embodiment. The present invention may be realized as a program (computer program product) for causing a computer to execute such a method, or as a computer-readable non-transitory recording medium on which such a program is recorded.

[0080] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the present invention.

[0081] 10 Evacuation guidance presentation system 11 Calculation unit 12 Determination unit 13 Presentation unit 21, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 Sensor 22 Guidance UI 50 Disaster prevention system

Claims

1. An evacuation guidance presentation system that provides evacuation guidance by presenting evacuation routes in the event of a fire in a facility, comprising: a calculation unit that calculates a spatial hazard value for each of a plurality of unit spaces that virtually divides the facility, based on a function of the time it takes for smoke to reach the unit space from the point at which the fire breaks out; a determination unit that determines an optimal evacuation route, among a plurality of evacuation routes in the facility, which is the evacuation route that has the smallest sum of the spatial hazard values ​​of one or more unit spaces that the evacuation route passes through; and a presentation unit that causes the evacuation route determined as the optimal evacuation route by the determination unit to be presented.

2. The evacuation guidance presentation system of claim 1, wherein the calculation unit acquires detection results from each of a plurality of sensors installed in each unit space, and calculates the spatial danger value for each of the plurality of unit spaces from the acquired detection results.

3. The evacuation guidance presentation system according to claim 2, wherein the sensor is a detector.

4. The calculation unit calculates the amount of smoke at the point where the fire occurred using the following formula (1): ｓ and calculating the spatial hazard value for each of the plurality of unit spaces based on the determined amount of smoke generated. The evacuation guidance presentation system according to claim 2 or 3.

5. The evacuation guidance presentation system of any one of claims 1 to 3, wherein the calculation unit calculates the time for smoke to arrive based on the path length and horizontal propagation speed of the path that the smoke takes to propagate from the point where the fire started to the unit space, and the horizontal propagation speed is proportional to the cube root of the amount of smoke at the point where the fire started.

6. The evacuation guidance presentation system according to any one of claims 1 to 3, wherein each of the plurality of evacuation routes is a route leading to an emergency staircase or to the outdoors.

7. The evacuation guidance presentation system according to any one of claims 1 to 3, wherein the presentation unit presents the optimal evacuation route by at least one of a sound, a flashing light, and a signage.

8. The evacuation guidance presentation system according to claim 5, wherein the calculation unit reduces the horizontal propagation speed in accordance with a branching route on the route from the point where the fire broke out to the unit space.

9. The evacuation guidance presentation system according to claim 5, wherein the calculation unit reduces the horizontal propagation speed in accordance with a smoke exhaust mechanism present on the path from the point where the fire started to the unit space.

10. An evacuation guidance presentation method executed by a computer for providing evacuation guidance by presenting evacuation routes in the event of a fire in a facility, the method comprising: calculating a spatial hazard value for each of a plurality of unit spaces virtually dividing the facility based on a function of the time it takes for smoke to reach the unit space from the point at which the fire breaks out; determining an optimal evacuation route among a plurality of evacuation routes in the facility, which is the evacuation route that has the smallest sum of the spatial hazard values ​​of one or more unit spaces that are passed through on the evacuation route; and presenting the evacuation route determined to be the optimal evacuation route.

11. A program for causing a computer to execute the evacuation guidance presentation method according to claim 10.

12. A disaster prevention system comprising the evacuation guidance presentation system according to claim 2 or 3 and the plurality of sensors provided in the facility.

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