Method for detecting powder of fire and fire powder detection sheet

Abstract

To provide a fire spark detection method capable of detecting coming of fire sparks in simple configuration, and a fire spark detection sheet.SOLUTION: A detection sheet 10 comprises a sheet-shaped detection member 11 and a fire-retardant protection member 15. The detection member 11 is formed from a synthetic resin by providing a space 11s between a first surface 11a which is molten by heat of fire sparks and on which a hole is formed, and a second surface 11b at an opposite side of the first surface 11a. A state change of the space 11s is detected by the hole formed in the detection member 11 by coming of the fire sparks.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for detecting powder of fire generated in operations using fire and a fire powder detection sheet.

Background Art

[0002] At a construction site, in operations using fire such as welding and cutting, powder of fire such as sparks generated during the operation may scatter. On the other hand, at a construction site, a large amount of heat insulating material is used to ensure the heat insulating performance of a building. Since this heat insulating material is a combustible material, if the scattered powder of fire falls on the heat insulating material, it may lead to a fire. Therefore, consideration is given to prevent the powder of fire from falling on the heat insulating material for fire prevention. However, since the powder of fire may scatter to an unexpected place rarely, detection of the powder of fire is important for fire prevention. Therefore, a fire powder detection system that detects powder of fire using a captured image has been studied (see, for example, Patent Document 1). In the fire powder detection system described in this document, a differential extraction image is generated by extracting a portion different from a preceding captured image from a captured image taken at a shutter speed at which the scattering locus of the powder of fire is linearly displayed. Then, the powder of fire is detected by extracting a linear region showing a combustion color line shape in the differential extraction image.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when photographing with a camera, it is difficult to grasp the scattering of the powder of fire unless the photographing range and photographing conditions are accurately set.

Means for Solving the Problems

[0005] A method for detecting powder of fire for solving the above problems is a method for detecting the flying of powder of fire, which is formed in a sheet shape with a synthetic resin that can be melted by the heat of the powder of fire to form holes, and a detection member provided with a space inside is arranged, and the state change of the space is detected by the holes formed in the detection member due to the flying of the powder of fire.

[0006] Also, a detection sheet for detecting the flying of powder of fire for solving the above problems is a detection sheet for detecting the flying of powder of fire, which is formed in a sheet shape with a synthetic resin that can be melted by the heat of the powder of fire to form holes, provided with a space inside, and includes a detection member whose state changes due to the formation of the holes.

Effect of the Invention

[0007] According to the present invention, the flying of powder of fire can be detected with a simple configuration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] Hereinafter, with reference to FIGS. 1 to 4, an embodiment in which the fire powder detection method and the fire powder detection sheet of the present disclosure are embodied will be described. As shown in FIG. 1, the detection sheet 10 of this embodiment is configured by laminating a sheet-shaped detection member 11 and a protective member 15. This detection sheet 10 is, for example, rectangular with a length and width of several meters and a thickness of about several centimeters. For the sake of explanation, the thickness is shown enlarged in the figure.

[0010] The detection member 11 is made of a synthetic resin such as vinyl that melts at the temperature of fire powder. This detection member 11 forms a space 11s over the entire surface between the first surface 11a and the second surface 11b. An extraction portion 18 communicating with the space 11s is provided at a corner portion of the detection member 11. The space 11s is a sealed space having a shape like an elongated space folded back.

[0011] Therefore, as shown in FIG. 2, the space 11s has a shape in which a plurality of spaces are arranged in the cross section of the detection sheet 10 at the 2-2 line. Further, the space 11s is filled with air at a pressure higher than the external atmospheric pressure through an air insertion valve (not shown), and the space 11s has a bulged shape.

[0012] The protective member 15 is laminated on the second surface 11b side of the detection member 11. This protective member 15 is a sheet-shaped member made of a flame-retardant material. In this embodiment, as the protective member 15, a material that is difficult to pass fire powder, for example, a sputter sheet type A (JIS A1323 type A) is used. The thickness of this protective member 15 is also shown enlarged in the figure.

[0013] As shown in FIG. 1, the extraction portion 18 is connected to the change detection device 21. The change detection device 21 measures the pressure in the space 11s. This change detection device 21 is connected to the notification device 22. When the change detection device 21 detects a change in the sealed state of the space 11s based on the measured pressure, it notifies the notification device 22.

[0014] The notification device 22 notifies the administrator's mobile terminal 25. For this purpose, the notification device 22 stores the email address which is the notification destination of the administrator's mobile terminal 25. Then, when the notification device 22 receives a pressure change signal from the change detection device 21, it notifies the stored email address that a spark has come to the detection sheet 10.

[0015] (Fire use operation using the fire powder detection sheet 10) Next, with reference to FIGS. 3 and 4, the fire use operation using the detection sheet 10 described above will be explained.

[0016] As shown in FIG. 3, there may be a case where it is necessary to perform a fire use operation such as welding or cutting near a place where combustibles are arranged. Here, as such combustibles, heat insulating materials 31 stacked for temporary placement on the floor inside a building are assumed. Here, the heat insulating material 31 is assumed to be a protection target member.

[0017] In this case, before the fire use operation, the detection sheet 10 is placed on the heat insulating material 31 so as to cover the entire stacked heat insulating material 31. Here, the detection sheet 10 is arranged such that the first surface 11a of the detection member 11 is on the outside and the protection member 15 is on the side of the heat insulating material 31. Further, a net member N1 (damage suppression member) having a mesh is arranged so as to cover the outside of the first surface 11a. This net member N1 suppresses damage such as holes in the detection member 11 due to rubbing of the first surface 11a.

[0018] As shown in FIG. 4, even when the fire use operation is performed while paying attention to the scattering of the fire powder F1, the fire powder F1 may come to the heat insulating material 31. In this case, due to the heat of the fire powder F1, the first surface 11a of the detection member 11 melts and a hole 11h is formed. Through this hole 11h, air escapes from the sealed space 11s, and the pressure of the opened space 11s decreases.

[0019] Then, the change detection device 21 detects the pressure change in the space 11s of the detection member 11 and notifies the notification device 22. The notification device 22 notifies the administrator's mobile terminal 25 that the fire powder F1 has been detected on the detection sheet 10.

[0020] According to the present embodiment, the following effects can be obtained. (1) The detection sheet 10 of the present embodiment includes a detection member 11 made of a material that melts with the heat of the fire powder F1. Thus, when the fire powder F1 flies and hits the first surface 11a of the detection member 11, a part of the first surface 11a melts and the hole 11h is formed. Then, due to this hole 11h, the change in the sealed state of the space 11s that has been sealed is detected by the change detection device 21, and the flying of the fire powder F1 can be detected.

[0021] (2) In the detection sheet 10 of the present embodiment, a flame-retardant protection member 15 is integrated with the detection member 11. Thereby, the heat insulating material 31 side becomes the protection member 15, and by covering the heat insulating material 31 with the detection sheet 10, the heat insulating material 31 can be blocked from the fire powder F1.

[0022] (3) In the detection member 11 of the present embodiment, the space 11s having a shape in which an elongated space is folded back is formed over the entire surface. Thereby, even when the space 11s is filled with air, only the central portion of the detection member 11 does not bulge greatly, and the entire detection member 11 can bulge with the same thickness. Further, no matter where the fire powder F1 hits the first surface 11a, a pressure change occurs in the space 11s, and the flying of the fire powder F1 can be detected.

[0023] The present embodiment can be implemented with the following modifications. The present embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range. · In the above-described embodiment, the space 11s of the detection member 11 of the detection sheet 10 was filled with air and sealed using pressure to form the space 11s. Then, when the hole 11h was formed, the flying of the sparks F1 was detected based on the pressure change due to the escape of air (gas) from the space 11s. The change in the state of the sealed state of the space 11s formed in the detection sheet 10 is not limited to a pressure decrease, and a pressure increase may also be detected. For example, an elastic member (e.g., sponge) is inserted into the space formed between the first surface and the second surface of the detection member, and this space is made into a negative pressure. Then, when a hole is formed by the sparks F1, air flows into the detection sheet through the hole, and the sponge expands and presses against the surface of the detection sheet. Due to this pressure change, the flying of the sparks F1 can be detected.

[0024] Also, the change in the state in the space formed between the first surface and the second surface of the detection member is not limited to the case of detecting using air. For example, other gases such as nitrogen may be used for detection. Further, a liquid may be used instead of the gas. For example, a colored liquid may be filled into the detection member. In this case, the change in the state of the space of the detection member may be detected based on the water pressure change, or the change in the state of the detection member may be detected by detecting the colored liquid by an image. Further, when the space is filled with a liquid, the heat of the sparks F1 can be cooled by the liquid in the space. Therefore, the liquid filled in the space can protect the member to be protected from the sparks F1.

[0025] When using a colored liquid as in the detection sheet 40 shown in FIG. 5, when a hole 41h is formed in the first surface 41a of the detection member 41 by the sparks F1, the colored liquid flows out from the hole 41h, so that the location where the sparks F1 fly can also be efficiently grasped.

[0026] · In the above-described embodiment, the flying of the sparks F1 was detected by detecting the pressure change in the space 11s of the detection member 11. The detection method is not limited to the pressure change as long as the change in the state of the space 11s can be detected.

[0027] For example, as shown in FIG. 6, a detection member 51 of the detection sheet 50 is provided with a sealed space 51s between a first surface 51a and a second surface 51b. Inside the space 51s, a first electrode 51e is provided on the first surface 51a, and a second electrode 51f is provided on the second surface 51b, and the two are kept non-contact. These electrodes may be either contact switches or mesh-shaped. Then, the state change of the space 51s is detected by the change in the conduction state of the space 51s between the first surface 51a and the second surface 51b.

[0028] After that, as shown in FIG. 7, when powder of fire F1 flies to the first surface 51a of the detection member 51 and a hole 51h is formed, the space 51s shrinks and the first electrode 51e and the second electrode 51f come into contact. As a result, since the conduction state is achieved, the flying of the powder of fire F1 can be detected.

[0029] Also, instead of the mesh-shaped electrodes (51e, 51f), the detection member may be formed of a conductive plastic. The conductive plastic is a composite material that has conductivity by kneading an inorganic conductor such as metal or carbon fiber into an insulating plastic or forming a thin film of a conductor on the surface. When formed of a conductive plastic, holes are formed on the surface by the powder of fire F1, and deformation of the space of the detection member occurs. Due to this deformation, the resistance value between the first surface and the second surface changes, and the flying of the powder of fire can be detected.

[0030] · In the above embodiment, the space 11s of the detection member 11 was in a sealed state, and the state change of the sealed state of the space 11s was detected by the formation of the hole 11h due to the flying of the powder of fire F1. As long as the state change of the space can be detected, it is not necessary for the space to be in a sealed state. Even if the space of the detection member is in an open state, as long as a hole is formed and the shape or volume of the space changes. For example, when detecting a space change using sound, a speaker or a microphone is installed inside the space of the detection member. Then, the sound from the speaker is picked up by the microphone to identify the resonance frequency. When a hole is formed due to the flying of the powder of fire F1 and the state of the space changes, the resonance frequency changes. By this change, the flying of the powder of fire F1 can be detected.

[0031] · In the detection sheet 10 of the above embodiment, one space 11s was formed in the sheet-shaped detection member 11, and the change in pressure in this space 11s was detected by the change detection device 21. Instead of this, the space formed in the detection member of the detection sheet may be divided into a plurality of small spaces, the change in pressure in each small space may be detected, and the flying and flying locations of the fire dust F1 may be detected in the detection sheet 10. In this case, a pressure detection device for detecting the change in pressure in each of the divided small spaces is provided. The notification device stores the position information of each small space in the detection sheet in association with the information of the pressure detection device to be detected. Then, when the notification device detects a change in pressure from the pressure detection device, it may specify the position information in each small space and notify this position information to the administrator.

[0032] · In the above embodiment, the detection sheet 10 includes a sheet-shaped detection member 11 and a protection member 15. The detection sheet 10 only needs to include at least the detection member 11, and the protection member 15 that protects the object to be protected, such as the heat insulating material 31, from the fire dust may be a separate body. In this case, the protection member is arranged so as to cover the outside of the object to be protected, and the detection member is arranged so as to cover the outside of this protection member. Thereby, a protection effect can be obtained. Further, a protection member may be further arranged on the outside of the detection member (the side opposite to the heat insulating material 31). · In the above embodiment, the space 11s of the detection member 11 was provided between the first surface 11a and the second surface 11b. The method of forming the space of the detection member may have any configuration. For example, it may be configured by bonding the peripheries of two sheet-shaped members, or may be configured in a rectangular parallelepiped shape using six sheet-shaped members. · In the above embodiment, the change in pressure in the space 11s of the detection member 11 was detected by the change detection device 21 connected via the extraction portion 18. Instead of detecting the change in pressure by the change detection device 21 provided outside the detection member 11, it may be detected by a pressure sensor provided in the space 11s. In this case, a signal from the pressure sensor is supplied to the notification device 22.

[0033] · In the above embodiment, the detection sheet 10 has the sheet-shaped protective member 15 disposed on the entire second surface 11b of the sheet-shaped detection member 11. The detection member 11 is not limited to being disposed so as to overlap the protective member 15. For example, the detection member may be disposed at the peripheral edge of the protective member 15 to detect the flying of sparks F1 at the peripheral edge. Further, when the object to be protected such as the heat insulating material 31 is in a shaded area and a part thereof is exposed, the detection member may be disposed so as to cover only the exposed part.

[0034] · As the protective member 15 of the detection sheet 10 of the above embodiment, the sputtering sheet A type was used, but any non-combustible material or flame-retardant material (fire-resistant material) through which the heat of the sparks F1 does not transfer to the object to be protected may be used. Also, in the embodiment, the net member N1 was provided on the detection sheet 10, but this net member N1 may be omitted.

[0035] · In the above embodiment, the detection sheet 10 was placed on the heat insulating material 31 so as to cover the outer surface of the heat insulating material 31 laminated on the floor. The arrangement of the detection sheet 10 is not limited to being placed on the object to be protected, and may cover the object to be protected. For example, the detection sheet 10 may be arranged to be suspended so as to cover the surface of the heat insulating material already installed on the surface of the wall. Furthermore, for the purpose of detecting whether or not the sparks F1 fly to a location where there is no object to be protected, the detection sheet 10 or a detection member without the protective member 15 may be arranged at that location.

[0036] · In the above embodiment, when the notification device 22 receives the signal of the pressure change detected by the change detection device 21, it notifies the registered e-mail address of the administrator's mobile terminal 25. The method of notifying the state change detected in the detection sheet 10 is not limited to notification to the mobile terminal. For example, when the notification device 22 detects a state change, it may notify the surroundings using sound or light.

[0037] Next, the technical idea that can be grasped from the above embodiment and the alternative example is added below. (a) The space provided inside the detection member is a sealed space, The detection member is characterized by detecting a change in the state of the sealed state of the space, according to the method for detecting powder of fire according to claim 1 or 2. (b) The detection member is characterized by detecting a pressure change in the space as the state change, according to the method for detecting powder of fire according to claim 1, 2 or (a) above. (c) The powder of fire detection sheet according to claim 3, characterized in that a protection member for protecting the first surface is provided on the first surface side of the detection member.

Description of Signs

[0038] N1… net member, 10, 40, 50… detection sheet, 11, 41, 51… detection member, 11a, 51a, 41a… first surface, 11b, 51b… second surface, 11h, 41h, 51h… hole, 11s, 51s… space, 15… protection member, 18… extraction part, 21… change detection device, 22… notification device, 25… mobile terminal, 31… heat insulating material, 51e… first electrode, 51f… second electrode.

Claims

1. A method for detecting flying sparks, comprising: disposing a detection member formed in a sheet shape of a synthetic resin that can be melted by the heat of the flying sparks to form holes and having a space provided therein; detecting a change in the state of the space through the holes formed in the detection member due to the flying of the flying sparks.

2. The method for detecting flying sparks according to claim 1, wherein after disposing a non-combustible or flame-retardant sheet-shaped protection member on the side of the protection target member to be protected from the flying sparks, the detection member is disposed outside the protection member.

3. A detection sheet for detecting flying sparks, comprising: a detection member formed in a sheet shape of a synthetic resin that can be melted by the heat of the flying sparks to form holes, having a space provided therein, and the state of the space changing due to the formation of the holes.

Images