Fire alarm system

Abstract

To provide a fire alarm system suitable for detecting a fire occurring in a monitored area.SOLUTION: A fire alarm system according to the present disclosure comprises: a structure having a roof part, which can be temporarily installed above a monitored area for a fire outbreak; and a smoke detector installed on the roof part, which outputs a fire signal when smoke is detected in the monitored area. The fire alarm system of a simple configuration can be temporarily installed in the monitored area and enables rapid and highly accurate fire alarm based on smoke detection.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fire alarm system, and more particularly to a fire alarm system that uses a smoke detector mounted on a roof that can be temporarily installed. [Background technology]

[0002] For example, in buildings under construction, temporary material storage areas, waste storage areas called industrial waste yards, etc. are commonly set up. In the following explanation, such storage areas will be collectively referred to as material storage areas. There have been cases where fires have occurred in temporary material storage areas set up during construction, and there has been growing interest in disaster prevention measures for such material storage areas.

[0003] The material storage area during the construction of a building is not necessarily indoors, but may be located in a temporary outdoor location, for example. Therefore, situations where it is difficult for people to monitor the area, particularly at night, are likely, and there is a strong demand for a fire alarm system that is suitable for detecting fires in material storage areas.

[0004] Possible causes of fires in material storage areas include arson and careless handling of ignition sources during construction work.

[0005] As an example of conventional technology for detecting arson, there is the following arson detection system (see, for example, Patent Document 1): The system according to Patent Document 1 includes a flame sensor having a flame detection unit, a human body sensor having a human body detection unit, a sensitivity setting unit that sets the sensitivity of the flame detection unit, a transmitting unit that transmits an intrusion signal when the human body detection unit detects a human body, and a receiving unit that receives the intrusion signal.

[0006] The system disclosed in Patent Document 1 controls the sensitivity setting unit to switch to high sensitivity when an intrusion signal is received. If a flame is detected by the flame sensor, a fire signal is wirelessly transmitted to the receiver. The receiver, having received the fire signal and the intrusion signal, determines that arson has occurred and transfers the arson signal to a mobile terminal.

[0007] As a result, even if the device is installed outdoors with the sensitivity normally set to low, false alarms caused by sunlight and other factors are reduced, and the manager carrying the mobile device is quickly notified that a fire has been detected. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-303093 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the conventional techniques have the following problems. The system disclosed in Patent Document 1 targets arson and monitors for fires outside buildings that are normally unoccupied by increasing sensitivity when a human body is detected. However, as mentioned above, the cause of fires in material storage areas is not limited to arson, and other factors, such as careless handling of ignition factors during construction work, are also possible, making it important to reliably detect fires caused by all of these causes.

[0010] From this perspective, the system described in Patent Document 1 cannot detect arson with high sensitivity unless an intrusion signal is detected, and cannot reliably detect fires that may occur in material storage areas.

[0011] Furthermore, as mentioned above, it is conceivable that the material storage area for a building under construction will be set up in a temporary outdoor location, and once the construction work is completed, the material storage area will be removed or moved, eliminating the need for fire detection at the original temporary location. Therefore, unlike the case of constantly monitoring fires in a normal building, it is important that the configuration is easy to install and remove.

[0012] Furthermore, even if a fire occurs in a temporary fire monitoring area, such as in a materials storage area for a building under construction, it is possible that significant damage will occur in terms of money and construction time. Therefore, taking these circumstances into consideration, there is a strong need to establish a fire alarm system that is configured to detect fires that occur in areas subject to fire monitoring.

[0013] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fire alarm system having a simple configuration suitable for detecting fires occurring in a monitored area. [Means for solving the problem]

[0014] The fire alarm system according to the present disclosure includes a structure having a roof portion that can be temporarily installed above a monitoring area for the occurrence of a fire, and a smoke detector that is installed on the roof portion and outputs a fire signal when it detects smoke occurring in the monitoring area. A fireproof sheet is used as the roof, and the system further includes a support pole used during temporary installation to stretch the fireproof sheet over the area to be monitored, and by collapsing the support pole, the area to be monitored can be covered with the fireproof sheet. It is something. In addition, the fire alarm system disclosed herein has a structure that uses a pipe tent with a roof that can be temporarily installed above the area monitored for fires, where the area monitored for fires is a material storage area temporarily installed outdoors during the construction of a building, a smoke detector that is installed on the roof and outputs a fire signal when it detects smoke that has occurred in the monitored area, a second detector that is installed on the roof separately from the smoke detector and has a higher smoke detection sensitivity than the smoke detector and outputs a second fire signal, and a controller that uses the smoke detector and the second detector in combination and determines that smoke has been detected when it receives both the fire signal output from the smoke detector and the second fire signal output from the second detector. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to obtain a fire alarm system having a simple configuration suitable for detecting a fire occurring in a monitored area. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an overall configuration diagram of a fire alarm system according to a first embodiment of the present disclosure. [Figure 2] FIG. 10 is an overall configuration diagram of a fire alarm system according to a second embodiment of the present disclosure. [Figure 3] FIG. 10 is an overall configuration diagram of a fire alarm system according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, preferred embodiments of the fire alarm system of the present disclosure will be described with reference to the drawings. The fire alarm system of the present disclosure has a technical feature in that it has a simple configuration that can detect fires occurring in a monitored area with high accuracy and speed by monitoring smoke, for example, when a material storage area temporarily set up outdoors during the construction of a building is set as a monitored area for fires.

[0018] Embodiment 1 Fig. 1 is an overall configuration diagram of a fire alarm system according to a first embodiment of the present disclosure. Fig. 1 illustrates a case where a material storage yard 1 temporarily installed outdoors during the construction of a building is set as a target area to be monitored for the occurrence of a fire. A typical example of the material storage yard 1 is an industrial waste yard set up outdoors a building under construction where materials to be disposed of are stored.

[0019] The fire alarm system according to the first embodiment shown in FIG. 1 includes a structure 10, a smoke detector 21, a highly sensitive smoke detector 22 as a second detector, sprinkler heads 30(1) and 30(2), and a controller 40.

[0020] The structure 10 comprises a roof 11 that can be temporarily installed above the material storage yard 1 and supports 12 that support the roof 11, and what is commonly called a pipe tent can be used. Note that the roof 11 can also be configured with hanging walls 11a added to the end of the roof 11 as a smoke retention shape to retain the smoke generated in the material storage yard 1.

[0021] During the construction of a building, a structure 10 having a roof 11 can be easily temporarily installed using supports 12 on a material storage yard 1 that has been temporarily installed outdoors. By temporarily installing such a structure, smoke generated in the material storage yard 1 moves upward and remains on the roof 11. Here, "temporarily installing a structure" means that the structure can be assembled easily and in a short time, and after use has finished, the structure can be easily dismantled and returned to its current empty state.

[0022] A smoke detector 21 is installed on the roof 11, and outputs a fire signal when it detects smoke in the material storage area 1, which is the area to be monitored. For example, a spot-type smoke detector with multi-level sensitivity adjustment can be used as the smoke detector 21. This spot-type smoke detector 21 is resistant to dust, and can reduce false detections caused by dust even when installed outdoors.

[0023] In addition to the smoke detector 21, a high-sensitivity smoke detector 22 is also installed on the roof 11, which outputs a fire signal when it detects the occurrence of smoke in the material storage area 1, which is the monitored area. The high-sensitivity smoke detector 22 may be, for example, a type of smoke detector that uses a sampling pipe with many sampling holes to constantly suck in air stagnating on the roof through the many sampling holes and optically monitors the ambient air in the entire area.

[0024] Although this high-sensitivity smoke detector 22 is not as resistant to dust as smoke detector 21, it has a wider sensitivity setting range than smoke detector 21 and can be set to detect smoke with higher sensitivity than smoke detector 21. However, when used at high sensitivity, there are more false positives, especially when used outdoors, so it is desirable to use high-sensitivity smoke detector 22 with a sensitivity set slightly higher than that of low-sensitivity smoke detector 21 (class 3 sensitivity).

[0025] Therefore, smoke generated in the material storage area 1 can be detected with the minimum configuration of installing the smoke detector 21 on the roof 11. Furthermore, by using the smoke detector 21 and the high-sensitivity smoke detector 22 as a combined unit and configuring the system to detect smoke when both the smoke detector 21 and the high-sensitivity smoke detector 22 are activated, dust-resistant and highly accurate smoke detection becomes possible.

[0026] Sprinkler heads 30(1) and 30(2) are installed on the roof 11, and can spray water toward the material storage area 1, which is the monitored area, upon receiving a water spray command from outside. Here, the sprinkler heads 30(1) and 30(2) are attached to supports 12 so that they face toward the material storage area 1. The sprinkler heads 30(1) and 30(2) correspond to water spraying devices that function as fire extinguishing devices. Note that details such as water piping are not shown in Figure 1.

[0027] Controller 40 controls sprinkler heads 30(1), 30(2) based on the fire signals output from smoke detector 21 and high-sensitivity smoke detector 22. Specifically, when both smoke detector 21 and high-sensitivity smoke detector 22 are activated and controller 40 receives both the fire signal output from smoke detector 21 and the second fire signal output from high-sensitivity smoke detector 22, controller 40 outputs a water discharge command to sprinkler heads 30(1), 30(2), causing them to spray water toward material storage area 1.

[0028] A chemical tank (including a simple water tank) for supplying a fire extinguishing agent to sprinkler heads 30(1) and 30(2) is provided near controller 40. However, if there is no space for a chemical tank, an aerosol fire extinguisher in which the chemical agent and the head are integrated may be used as the fire extinguishing device instead of using sprinkler heads 30(1) and 30(2).

[0029] When the controller receives only one of the fire signal output from the smoke detector 21 and the second fire signal output from the high-sensitivity smoke detector 22, it can execute an alarm process to notify that a fire has occurred, without executing a water discharge process. Here, the alarm process means to activate an alarm device having a buzzer or the like (not shown) to notify that a fire may have occurred.

[0030] The effects of the fire alarm system according to the first embodiment described above can be summarized as follows. <Effect 1: Simple configuration allows for temporary installation> The minimum configuration is a structure with a roof that can be temporarily installed above the area to be monitored for fires, and a smoke detector installed on the roof so that it can detect smoke generated in the monitored area, thereby realizing a fire alarm system with a simple configuration that can be temporarily installed.

[0031] In particular, at construction sites, it is conceivable that a material storage yard will be temporarily set up outdoors or in a location with a high ceiling. It is also conceivable that the location of the material storage yard will be moved depending on the progress of the construction. In this case, the structure 10 will be dismantled and reassembled and temporarily set up in accordance with the new location. Therefore, by adopting the configuration according to the first embodiment, it is possible to easily provide a fire alarm system suitable for construction sites.

[0032] <Effect 2: Realization of a fast, highly accurate fire alarm system based on smoke detection> In the material storage area, which is the area to be monitored for fire outbreaks, it is possible that a fire will not burst into flames but will instead smolder internally, such as a smoldering fire. Therefore, in this first embodiment, by using a detector that can detect smoke, it is possible to quickly detect smoke that occurs before a flame breaks out.

[0033] Furthermore, if a configuration is adopted that combines a dust-resistant smoke detector with a high-sensitivity smoke detector that can be set to a higher smoke detection sensitivity, it is possible to achieve fast, highly accurate smoke detection while suppressing false alarms caused by dust.

[0034] <Effect 3: Efficiency and simplification of water discharge equipment> According to the first embodiment, it is possible to add a configuration in which water is sprayed toward the material storage area when smoke is detected. As explained in Effect 2, smoke detection allows the occurrence of a fire to be discovered quickly at an early stage. As a result, water spraying can be started early and the amount of fire extinguishing water can be reduced, thereby realizing the efficiency and simplification of the water spraying device.

[0035] Embodiment 2 In the previous first embodiment, a configuration in which hanging walls 11a are added to the end of the roof portion 11 as a smoke retention shape is described, thereby enhancing the effect of retaining smoke generated in the material storage yard 1 on the roof portion 11. In contrast to this, in the second embodiment, a roof portion 11 having a smoke retention shape different from the hanging walls 11a is described.

[0036] Fig. 2 is an overall configuration diagram of a fire alarm system according to a second embodiment of the present disclosure. Compared to the configuration shown in Fig. 1, the configuration shown in Fig. 2 differs in that the roof portion 11 has a protrusion 11b instead of a hanging wall 11a. Therefore, the following description will focus on the difference, that is, the protrusion 11b.

[0037] 2, the roof 11 in the present embodiment 2 has a convex portion 11b. Therefore, smoke generated in the material storage yard 1 rises toward the roof 11, then moves toward the convex portion 11b, and remains there.

[0038] Therefore, in the second embodiment, a convex portion 11b corresponding to a smoke retention shape is provided, and a configuration is adopted in which a smoke detector 21 and a highly sensitive smoke detector 22 are installed near the convex portion 11b. As a result, it is possible to improve the smoke retention effect and realize a rapid, highly accurate fire alarm system based on smoke detection. In other words, according to the second embodiment, effects 1 to 3 can be obtained, similar to the first embodiment.

[0039] Embodiment 3 In the first and second embodiments described above, a case has been described in which a dust-resistant smoke detector 21 and a high-sensitivity smoke detector 22, which can be set to a higher smoke detection sensitivity, are used in combination to quickly and accurately detect smoke generated in the material storage area 1. In contrast, in the third embodiment, a case will be described in which a smoke detector 21 and a sensor other than the high-sensitivity smoke detector 22 are used in combination.

[0040] Fig. 3 is an overall configuration diagram of a fire alarm system according to a third embodiment of the present disclosure. Compared to the configuration shown in Fig. 1, the configuration shown in Fig. 3 differs in that it includes an infrared radiation temperature sensor 23 instead of the high-sensitivity smoke detector 22. Therefore, the following description will focus on the infrared radiation temperature sensor 23, which is the difference.

[0041] As shown in Fig. 3, the roof 11 in the third embodiment is provided with a smoke detector 21 and an infrared radiation temperature sensor 23. The infrared radiation temperature sensor 23 does not detect smoke, but can detect a state in which the surface temperature of the monitored object exceeds a threshold value. By using the infrared radiation temperature sensor 23, it becomes possible to quickly detect abnormalities in the surface temperature, which occur earlier than the occurrence of flames.

[0042] Therefore, according to the third embodiment, by combining a dust-resistant smoke detector with an infrared radiation temperature sensor that can detect the surface temperature of a monitored object, it is possible to achieve quick and highly accurate smoke detection while suppressing false alarms due to dust, similar to the first and second embodiments. In other words, according to the third embodiment, it is possible to obtain effects 1 to 3, similar to the first and second embodiments.

[0043] The respective arrangements of the smoke detector 21, the high-sensitivity smoke detector 22, and the infrared radiation temperature sensor 23 are not limited to the layouts shown in Figures 1 to 3. The smoke detector 21, the high-sensitivity smoke detector 22, and the infrared radiation temperature sensor 23 can be individually arranged in any desired position suitable for detecting smoke generated in the material storage area 1 or temperatures above a threshold value.

[0044] 1 to 3, the structure 10 is described as having a roof 11 and support columns 12, but the structure 10 is not limited to this configuration. If a roof 11 that can be temporarily installed can be installed above the material storage area 1 by using a structure or the like at the construction site, the support columns 12 are not necessary.

[0045] Furthermore, the structure 10 can be an outdoor tent, pipe tent, or tarp tent used for camping, etc., and unlike a prefabricated structure, the material storage area 1 is not enclosed on all four sides, and by using a structure 10 with a roof 11 that only blocks the upper part of the material storage area 1, the convenience of temporary installation can be improved.

[0046] Furthermore, a fireproof sheet may be stretched over the material storage area 1 using supports as the roof 11. If a fireproof sheet is used for such a roof 11, in the event of a fire, the supports can be taken down and the industrial waste yard that will become the material storage area 1 can be covered with a lid to block the air, thereby extinguishing the fire inside the yard.

[0047] Furthermore, in the above-mentioned first to third embodiments, a material storage yard during the construction of a building has been described as a specific example of a "fire monitoring target area," but the "fire monitoring target area" in the present application is not limited to such a material storage yard at a construction site. For example, areas to which a configuration combining a structure with a roof portion that can be temporarily installed and a smoke detector can be applied, such as a material storage yard other than a construction site or an area to be monitored for fires at an outdoor event, are included in the "fire monitoring target area" in the present application. [Explanation of symbols]

[0048] 1 material storage area, 10 structure, 11 roof portion, 11a hanging wall, 11b convex portion, 12 support pillar, 21 smoke detector, 22 high-sensitivity smoke detector (second detector), 23 infrared radiation temperature sensor, 30(1), 30(2) sprinkler head (water discharge device), 40 controller.

Claims

1. a structure having a roof portion that can be temporarily installed above an area to be monitored for fire occurrence; a smoke detector that is provided on the roof and outputs a fire signal when it detects smoke generated in the monitored area; Equipped with A fireproof sheet is used as the roof portion, Further, a support pole is provided for temporarily installing the fireproof sheet to stretch the sheet over the monitored area. By breaking down the support pillars, it is possible to cover the monitored area with the fireproof sheet. Fire alarm system.

2. During the construction of a building, a temporary outdoor material storage area is set as the area to be monitored for fire occurrence, a structure using a pipe tent having a roof portion that can be temporarily installed above the area to be monitored for fire occurrence; a smoke detector provided on the roof portion, the smoke detector outputting a fire signal when detecting smoke generated in the monitored area; a second detector that is provided on the roof portion separately from the smoke detector, has a higher smoke detection sensitivity than the smoke detector, and outputs a second fire signal; a controller that uses the smoke detector and the second detector in combination and determines that smoke has been detected when both the fire signal output from the smoke detector and the second fire signal output from the second detector are received; A fire alarm system comprising:

3. The structure having the temporary roof portion can be assembled easily and in a short time, and after use, the structure can be easily disassembled and returned to its current bare state.

3. A fire alarm system according to claim 1 or 2.

Images