Method for manufacturing a fire extinguishing system

Abstract

Provided is a fire extinguishing system with which it is possible to provide the required types of sprinkler systems in required locations.　The fire extinguishing system is provided in a first region and in a second region differing from the first region, and comprises a low-pressure sprinkler system (100b) provided in the first region, and a normal-pressure or pressurized sprinkler system (200a) provided in the second region.

Description

[Technical field]

[0001] The present invention relates to a fire suppression system and a method for manufacturing the same. [Background technology]

[0002] A conventional wet sprinkler is disclosed in Japanese Patent No. 3264939. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3264939 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional sprinkler systems have a problem in that if a sprinkler head malfunctions, water will continue to be discharged from the sprinkler head. [Means for solving the problem]

[0005] A fire extinguishing system according to one aspect is provided in a first area and a second area different from the first area, and includes a negative pressure sprinkler system provided in the first area and a normal pressure or pressurized sprinkler system provided in the second area.

[0006] In the fire extinguishing system thus configured, a sprinkler system of a required type can be provided at a required location.

[0007] Preferably, the second zone normal or pressurized sprinkler system includes a sprinkler head in which metal melts in the heat of a fire, thereby discharging water from the sprinkler head without a signal from a detector.

[0008] In a fire extinguishing system configured in this way, the normal pressure or pressurized sprinkler system in the second zone is not linked to a detector, so when the metal of the sprinkler head melts due to the heat of a fire, water in the secondary piping is released from the sprinkler head. This system can be realized at low cost because it does not require coordinated control of the first and second zones. The introduction cost is low.

[0009] In the manufacturing method of the above-mentioned fire extinguishing system, a normal pressure or pressurized sprinkler system is provided in a first area, a leak point from the sprinkler piping of the normal pressure or pressurized sprinkler system is identified, a repair material is applied to the outside of the sprinkler piping to seal the leak point, and then a negative pressure pump is connected to the sprinkler piping to form a negative pressure sprinkler system.

[0010] In the method for manufacturing a fire extinguishing system configured as above, a negative pressure sprinkler system can be constructed by repairing the sprinkler system in the first area, which results in a low-cost manufacture of the negative pressure sprinkler system. [Brief description of the drawings]

[0011] [Figure 1] 11A to 11C are diagrams for explaining a manufacturing method of a fire extinguishing system. [Diagram 2] FIG. 1 is a schematic diagram of a fire extinguishing system before repair. [Diagram 3] FIG. 1 is a schematic diagram of a fire extinguishing system after repair. [Figure 4] FIG. 6 is an enlarged cross-sectional view of a water leakage point shown in an area surrounded by IV in FIGS. 3 and 5. [Diagram 5] FIG. 2 is a schematic diagram of a fire extinguishing system according to another aspect. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (Fire extinguishing system manufacturing method) FIG. 1 is a diagram for explaining a manufacturing method of a fire extinguishing system. As shown in FIG. 1, in the manufacturing method of a fire extinguishing system, a fluid leak from a secondary pipe of a sprinkler system is identified (step S301). The sprinkler system is a sprinkler system in which the secondary pipe is not under negative pressure. The sprinkler system may be a wet sprinkler system in which the secondary pipe is filled with a liquid. The sprinkler system may be a dry sprinkler system in which the secondary pipe is filled with a gas.

[0013] Furthermore, the sprinkler system is used in at least two areas, a first area and a second area. For example, the sprinkler system is used in a building having two or more floors. The sprinkler system is provided in a first floor of the building and a second floor above or below the first floor. Note that the two areas do not necessarily have to be located one above the other. The two areas may be provided on the same floor or on the same ground.

[0014] The secondary piping of a sprinkler system is the piping connected to the sprinkler head, while the piping from the water pump to the valve is called the primary piping of the sprinkler system.

[0015] As a method for identifying a leak from a secondary pipe, for example, if the secondary pipe is filled with water, the water will leak and cause a stain on the building, and the location of the leak can be identified by investigating the secondary pipe near the stain. If the secondary pipe is filled with gas, a pressure sensor is installed in the secondary pipe, and if the decrease in pressure per unit time is large, the secondary pipe is investigated as a leak, and the location of the leak can be identified.

[0016] Generally, leaks tend to occur in the thin walled areas of secondary piping. For example, the ends of secondary piping are often threaded and connected to fittings. Since the threaded parts tend to be thin walled, leaks can occur from these parts.

[0017] Once the leak has been identified, remove the liquid from the secondary piping. If the secondary piping is filled with gas, there is no need to remove the gas.

[0018] Water leakage from pipes in a normal pressurized or non-pressurized sprinkler system occurs through the following mechanism: After a long period of time has passed since the sprinkler system was installed, moisture in the pipes causes corrosion from the inside of the pipes to the outside, eventually forming a hole that penetrates from the inside of the pipes to the outside.

[0019] The leak is repaired from the outside of the secondary pipe (step S302). Methods for repairing the leak include applying a tape made of an organic or inorganic material from the outside of the secondary pipe, welding the leak from the outside of the secondary pipe, injecting a gel or sol-like substance into the leak from the outside of the secondary pipe, injecting a highly viscous fluid into the leak from the outside of the secondary pipe and then hardening the fluid, etc. The reason for repairing the leak from the outside of the secondary pipe is that, in order to create a negative pressure inside the secondary pipe in a later process, if the leak is repaired from the outside of the secondary pipe, the repair material will be subjected to a force that draws the repair material inward, making it difficult to remove the repair material, and therefore repairing from the inside of the secondary pipe is practically impossible, and therefore repairing the secondary pipe from the outside is less expensive than replacing the secondary pipe.

[0020] The leak is repaired in one of the first and second regions where the leak has occurred, and the secondary piping in the other region is not repaired.

[0021] When repairing, it is preferable to clean the outside of the secondary piping before repairing so that the repair material can easily adhere to the outside of the secondary piping. Cleaning methods include cleaning with a surfactant, cleaning with an acid or alkali, and cleaning by grinding the surface with a grinding stone.

[0022] The leak location is identified and the hole is repaired from the outside of the secondary piping. It is possible to remove the piping containing the leak, but removing the piping would require a large-scale renovation and would increase the amount of work required to protect the protected area. Furthermore, construction costs would also be high. Therefore, the leak is stopped by repairing the hole from the outside with repair material. Since a negative pressure sprinkler system will be constructed later, the repair material will not be pressurized from the hole to the outside, even if it is sucked toward the hole by negative pressure. Therefore, the repair material will not peel off.

[0023] A negative pressure pump is connected to the repaired secondary pipe (step S303). By connecting the negative pressure pump to the secondary pipe, it is possible to create a negative pressure inside the secondary pipe. When the secondary pipe is placed under negative pressure, the repair material provided on the outside of the secondary pipe is drawn into the inside of the secondary pipe, and the repair material is fixed to the leak location.

[0024] In an area where a negative pressure pump is connected to the secondary piping, the control system is modified so that the secondary piping functions as a negative pressure sprinkler. The secondary piping is under negative pressure and may not be filled with liquid, or may be filled with liquid. When the secondary piping is under negative pressure and filled with liquid, the area functions as a wet negative pressure sprinkler. The other areas function as non-negative pressure sprinklers. When the secondary piping is under negative pressure and not filled with liquid, the area functions as a dry negative pressure sprinkler. The other areas function as non-negative pressure sprinklers.

[0025] Wet Negative Pressure vinegarIn the case of a sprinkler, the secondary pipe is filled with liquid and the secondary pipe is under negative pressure, so the liquid evaporates from the secondary pipe. To replenish the evaporated liquid, a valve installed at the boundary between the secondary pipe and the primary pipe is opened, and liquid flows from the primary pipe to the secondary pipe. To enable such control, a sensor that detects the amount of liquid in the secondary pipe and a control device that opens the valve to supply liquid from the primary pipe to the secondary pipe as needed based on the sensor must be newly installed. In addition, when a fire occurs, it is possible to stop the suction by the negative pressure pump or weaken the suction power so that the liquid in the secondary pipe does not flow to the negative pressure pump side and the water in the secondary pipe is released only from the sprinkler.

[0026] In the case of dry negative pressure sprinklers, there is no need to consider the decrease in liquid in the secondary piping as described above, so there is no need to control the valve to prevent the decrease in liquid in the secondary piping. However, if a fire occurs, it is possible to stop the suction by the negative pressure pump or to weaken the suction force so that the liquid in the secondary piping does not flow to the negative pressure pump side and the water in the secondary piping is discharged only from the sprinkler.

[0027] The advantage of installing a negative pressure sprinkler system only in specific areas in this way is that the renovation costs are lower than if all areas were to be installed with a negative pressure sprinkler system.

[0028] Next, by using a negative pressure sprinkler system, repair work can be carried out from the outside of the secondary piping, reducing construction costs.

[0029] Leave the repaired piping and remove the components used only in pressure or non-pressurized sprinkler systems. Many components are different between pressure or non-pressurized sprinkler systems and negative pressure sprinkler systems, so remove the equipment used only in pressure or non-pressurized sprinkler systems.

[0030] (Description of negative pressure sprinkler system) Negative pressure sprinkler systems are used in environments where moisture is undesirable, such as medical facilities, nuclear power plants, and lithium battery factories. The negative pressure sprinkler system is installed in a building. The building has a first section which is a lower floor and a second section which is an upper floor. Note that the negative pressure sprinkler system does not necessarily have to be used in an environment where moisture is undesirable, and may be used in an environment where a pressurized or non-pressurized sprinkler system is used.

[0031] The negative pressure sprinkler system has a primary piping, a secondary piping connected to the primary piping, a sprinkler head provided on the secondary piping, a valve provided at the boundary between the primary piping and the secondary piping, and a water pump for sending water to the primary piping.

[0032] The primary pipe is filled with water. This water is pressurized by a water pump. The water pump is supplied with water from a fire water tank. The water pump may also be supplied with water from an elevated water tank on the top floor of the building. The primary pipe runs vertically from the water pump to the top of the building, and branches off at each floor. The number of floors in the building is not limited to the second floor. The water in the primary pipe is stopped by a valve, and when the valve is opened, the water in the primary pipe is sent to the secondary pipe. The opening and closing of the valve is controlled by a computer.

[0033] The secondary piping is connected to a valve. The secondary piping is located in the compartment where the fire is to be extinguished. The secondary piping is located in the ceiling of the compartment. The secondary piping is provided with multiple sprinkler heads. The number of sprinkler heads is determined by the size of the compartment.

[0034] A sprinkler head is a closed sprinkler head with multiple holes for releasing water. The sprinkler head has a heat-sensitive mechanism (fusible metal pieces). Normally, the holes for releasing water and the secondary piping are shielded inside the sprinkler head. When the heat-sensitive mechanism melts due to flames during a fire, the shield is opened and water is released from the holes in the sprinkler head via the primary piping.

[0035] The negative pressure system includes a negative pressure pipe connected to the secondary pipe, and a negative pressure pump that creates a negative pressure in the negative pressure pipe. A negative pressure sprinkler system can be realized simply by connecting the negative pressure pipe to the secondary pipe.

[0036] The negative pressure pump generates negative pressure. The negative pressure pump may be composed of a main unit and a standby unit. In this case, the pump can cover the entire facility's usage even during breakdowns and maintenance. When used in medical facilities, the sucked air containing germs and bacteria is collected by a suction filter so as not to contaminate the atmosphere.

[0037] The negative pressure pipe connected to the negative pressure pump rises vertically from the negative pressure pump to the top floor of the building and branches off on each floor. On each floor, the negative pressure pipe branches off and is laid out in each room. The negative pressure pump is connected to the negative pressure pipe.

[0038] The negative pressure pipe and the secondary pipe are connected at a connection point, so that the inside of the secondary pipe is normally under negative pressure.

[0039] When the negative pressure sprinkler system is a wet negative pressure sprinkler system, the secondary pipe is normally under negative pressure and water is present in the secondary pipe. By creating negative pressure, water can be prevented from being discharged from the sprinkler head even if the sprinkler head is damaged. In order to prevent water from moving from the secondary pipe to the negative pressure pipe, a membrane or a gas-liquid separator that allows water vapor to pass but does not allow water to pass may be provided near the connection point. Water evaporates because of the negative pressure in the secondary pipe. To replenish water, a valve may be opened to replenish water in the secondary pipe if the water level decreases.

[0040] When the negative pressure sprinkler system is a dry type negative pressure sprinkler system, the secondary piping is under negative pressure and no water is present in the secondary piping.

[0041] The detection system includes a fire detector and a computer. When a fire occurs in the protected area, the fire detector detects the heat or smoke. The computer and the valve are connected by a signal line. The computer and the water pump are connected by a signal line.

[0042] The fire extinguishing system is a negative pressure sprinkler system having a sprinkler head and a secondary piping as a sprinkler piping for supplying water to the sprinkler head, the secondary piping being normally maintained at a negative pressure state, a negative pressure piping, and a negative pressure pump as a negative pressure device for supplying negative pressure to the secondary piping and the negative pressure piping.

[0043] Fig. 2 is a schematic diagram of a fire extinguishing system before repair. As shown in Fig. 2, a sprinkler system 1 as a fire extinguishing system before repair is provided on a first floor 100 as a first area (first protection area) and a second floor 200 as a second area (second protection area). A pressurized sprinkler system 100a is provided on the first floor 100. A pressurized sprinkler system 200a is provided on the second floor 200. The pressurized sprinkler systems 100a and 200a may be replaced with other sprinkler systems that are not of the negative pressure type.

[0044] A primary pipe 4 is connected to the water pump 2. The output of the water pump 2 is controlled by a control device 3. The output of the water pump 2 can be changed continuously. Water is supplied to the water pump 2 from a water tank (not shown). This water does not need to have impurities added to it, and may contain rust inhibitors or the like.

[0045] A primary pipe 101 for a first floor 100 branches off from the primary pipe 4. The primary pipe 101 is connected to a valve 105 located at the boundary between the primary pipe 101 and a secondary pipe 102. The opening and closing of the valve 105 is controlled by a control device 3.

[0046] A plurality of sprinkler heads 103 are provided on the secondary piping 102. The sprinkler heads 103 are provided on the first floor 100. The sprinkler heads 103 have a portion that melts due to heat in the event of a fire. In the event of a fire, this portion melts and liquid (water) as a fire extinguishing agent is supplied from the secondary piping 102 to the first floor 100 via the sprinkler heads 103.

[0047] The secondary piping 102 may or may not be filled with water. A detector 104 for detecting heat is provided on the first floor 100. When the detector 104 detects heat, a signal is sent to the control device 3. The control device 3 instructs the water pump 2 to increase the output of the water pump 2. The control device 3 opens the valve 105. Even if the secondary pipe 102 is not filled with water, the secondary pipe 102 is filled with water by opening the valve 105. However, the air in the secondary pipe 102 is compressed and accumulates in the secondary pipe 102. If the secondary pipe 102 has been filled with water beforehand, the water pressure in the secondary pipe 102 increases by opening the valve 105.

[0048] When the meltable portion of the sprinkler head 103 melts due to heat, water from the secondary piping 102 is discharged onto the first floor 100 via the sprinkler head 103.

[0049] The primary pipe 4 is connected to a valve 205 located at the boundary between the primary pipe 4 and the secondary pipe 202. The opening and closing of the valve 205 is controlled by the control device 3. The primary pipe 4 is connected to other primary pipes 101, 201.

[0050] A plurality of sprinkler heads 203 are provided on the secondary piping 202. The sprinkler heads 203 are provided on the second floor 200. The sprinkler heads 203 have a portion that melts due to heat in the event of a fire. In the event of a fire, this portion melts and fire spreads from the secondary piping 202 through the sprinkler heads 203. Second floor 200 The secondary piping 202 may or may not be filled with water.

[0051] A detector 204 for detecting heat is provided on the second floor 200. When the detector 204 detects heat, a signal is sent to the control device 3. The control device 3 instructs the water pump 2 to increase the output of the water pump 2. The control device 3 opens the valve 205. Even if the secondary pipe 202 is not filled with water, the secondary pipe 202 is filled with water by opening the valve 205. However, the air in the secondary pipe 202 is compressed and accumulates in the secondary pipe 202. If the secondary pipe 202 is filled with water in advance, the water pressure in the secondary pipe 202 increases by opening the valve 205.

[0052] When possible, sensors 104 are reused in both the non-negative pressure sprinkler system and the negative pressure sprinkler system 100b.

[0053] When the meltable portion of the sprinkler head 203 melts due to heat, water from the secondary piping 202 is discharged onto the second floor 200 via the sprinkler head 203 .

[0054] Fig. 3 is a schematic diagram of the fire extinguishing system after repair. As shown in Fig. 3, it is assumed that a water leak point 110 occurs in the secondary piping 102. In this case, the water leak point 110 is repaired from the outside. Furthermore, the secondary piping 102 is connected to a negative pressure pump 5. A negative pressure pipe 109 is interposed between the secondary piping 102 and the negative pressure pump 5. This makes it possible to create a negative pressure inside the secondary piping 102.

[0055] 4 is a cross-sectional view of a water leak location. As shown in Fig. 4, at the water leak location 110, a hole 1020 is opened in the secondary piping 102. This hole is plugged with a repair material 111 from the outside of the secondary piping 102.

[0056] In this example, a leak point 110 occurs on the first floor 100, but a leak point may also occur in the secondary piping 202 on the second floor 200. In that case, the secondary piping 202 is repaired from the outside and connected to the negative pressure pump 5.

[0057] While the secondary piping 102 on the first floor 100 is under negative pressure, the secondary piping 102 may be filled with water, or may not be filled with water. When filling with water, the water is likely to evaporate because the secondary piping 102 is under negative pressure. When the water in the secondary piping 102 evaporates and the water level drops, the valve 105 is opened to replenish the secondary piping 102 with water.

[0058] Secondary Piping 1 If water is not filled inside 02, it operates as a dry negative pressure sprinkler.

[0059] In the sprinkler system 1, a negative pressure sprinkler system is provided on the first floor 100, and a non-negative pressure sprinkler system is provided on the second floor 200. Note that the first floor 100 may have a non-negative pressure sprinkler system, and the second floor may have a negative pressure sprinkler system.

[0060] If a leak occurs not only in the secondary piping 102 on the first floor 100 but also in the secondary piping 202 on the second floor 200, the leak can be repaired from the outside of the secondary piping 202 and the secondary piping 202 can be connected to a negative pressure pump 5 to form a negative pressure sprinkler system on the second floor 200 as well.

[0061] Oxygen and the like contained in the water in the pipe forms holes 1020 as pinholes. The presence of the holes 1020 allows water to flow out of the holes 1020. After the position of the holes 1020 is identified, the holes 1020 are repaired from the outside with a repair material 111. Block It is possible.

[0062] Examples of the repair material 111 include aluminum tape, tape made of glass fiber cloth impregnated with resin, and gummed tape. Furthermore, the repair material 111 can be formed by welding a metal plate to the secondary piping 102.

[0063] The negative pressure sprinkler system 100b was originally a pressurized or non-pressurized sprinkler system, and was modified to a negative pressure type by forming the holes 1020 and closing the holes 1020.

[0064] The sprinkler system 1 comprises a negative pressure sprinkler system 100b having a sprinkler head 103 and secondary piping 102 with a negative pressure inside for supplying water to the sprinkler head 103, and a negative pressure pump 5 for maintaining the negative pressure sprinkler system 100b in a negative pressure state under normal conditions, and the secondary piping 102 has a hole 1020 formed therein that penetrates the secondary piping 102 in the thickness direction, and further comprises a repair material 111 that seals the opening of the hole 1020 from the outside of the secondary piping.

[0065] The operation of the negative pressure sprinkler system 100b will be described. When a fire breaks out on the first floor 100, which is a part of the protected area, the detector 104 detects heat or smoke caused by the fire. The detected information is sent from the detector 104 to the control device 3, which is a computer. The control device 3 sends a signal to the valve 105 to open it. The control device 3 drives the water pump 2 or increases the driving force of the water pump 2. As a result, in the dry type negative pressure sprinkler system 100b, water is filled in the secondary pipe 102, which normally has no water and is in a negative pressure state. In the wet type negative pressure sprinkler system 100b, water is filled in the secondary pipe 102 normally in a negative pressure state. At this time, the driving force of the negative pressure pump 5 may be weakened from that in the steady state.

[0066] The heat from the fire melts the heat-sensitive mechanism of the sprinkler head 103. This connects the water discharge hole of the sprinkler head 103 to the secondary piping 102. When the valve 105 is opened, water is discharged from the water discharge hole of the sprinkler head 103, thereby extinguishing the fire.

[0067] Compared with a dry sprinkler system (pre-action sprinkler system) in which the secondary piping is normally at normal pressure, the negative pressure sprinkler system 100b according to the embodiment has the following advantages. In a normal pressure dry sprinkler system, a pump is operated in the event of a fire to fill the secondary piping with water, but at this time, the air in the secondary piping is compressed by the water, so the secondary piping is not filled with water smoothly (in a short time). In contrast, in the wet negative pressure sprinkler system 100b, the secondary piping 102 is filled with water at negative pressure, so water can be sprayed from the sprinkler head 103 at an early stage. Therefore, the problem of delayed water spraying from the sprinkler head, which was a drawback of the conventional dry sprinkler (pre-action sprinkler), can be solved. Even in the case of the dry negative pressure sprinkler system 100b, the secondary piping 102 is quickly filled with water because the secondary piping 102 is at negative pressure, so water can be sprayed from the sprinkler head 103 at an early stage.

[0068] Since the secondary pipe 102 has been used in a pressurized or non-pressurized sprinkler system, the manufacturing cost can be reduced compared to a new installation. Furthermore, the repair material 111 is attached to the outside of the secondary pipe 102, but since the inside of the secondary pipe 102 is normally under negative pressure, water will not leak again from the hole 1020.

[0069] The sprinkler system 1 as a fire extinguishing system is provided in a first floor 100 as a first area and a second floor 200 as a second area different from the first area, and includes a negative pressure sprinkler system 100b provided on the first floor 100 and a normal pressure or pressurized sprinkler system 200a provided on the second floor 200. The first floor 100 may be the second area, and the second floor 200 may be the first area.

[0070] In the fire extinguishing system configured in this manner, a sprinkler system of the required type can be provided at the required location. Although the manufacturing method in which the hole 1020 is repaired with the repair material 111 has been shown, the hole 1020 does not necessarily have to be provided. If the hole 1020 is not provided, the repair material 111 is not provided either.

[0071] FIG. 5 is a schematic diagram of a fire extinguishing system according to another aspect. As shown in FIG. 5, the fire extinguishing system 1 according to another aspect is different from the fire extinguishing system 1 shown in FIGS. 3 and 4 in that a sensor is not provided on the second floor 200. The normal pressure or pressurized sprinkler system 200a on the second floor 200 includes a sprinkler head 203, and the metal in the sprinkler head 203 melts due to the heat of the fire, thereby discharging water from the sprinkler head 203 without a signal from the sensor. That is, the sprinkler head 203 is not connected to the control device 3. Note that, in this embodiment, the first floor 100 may be the second area and the second floor 200 may be the first area, as in the embodiment of FIGS. 3 and 4. Furthermore, the secondary piping 102 may be manufactured by a manufacturing method in which a hole 1020 is provided and repaired with a repair material 111. Also, the hole 1020 of the secondary piping 102 may not be provided. If the holes 1020 are not provided, the repair material 111 is not provided either.

[0072] When sprinkler head 203 discharges water without a signal from sensor and control device 3, the factor that determines the water discharge conditions from sprinkler head 203 on second floor 200 is only the melting temperature of the metal inside sprinkler head 203, making it easy to control the water discharge conditions. Therefore, sprinkler system 1 can be introduced at low cost.

[0073] According to one aspect, a fire extinguishing system is provided in at least one of a first area and a second area different from the first area, and includes a negative pressure sprinkler system having a sprinkler head and a secondary pipe having a negative pressure inside for supplying water to the sprinkler head, and a negative pressure pump for maintaining the negative pressure sprinkler system in a negative pressure state under normal conditions, wherein a hole is formed in the secondary pipe that penetrates the secondary pipe in the thickness direction, and the secondary pipe further includes a repair material that seals the opening of the hole from the outside of the secondary pipe.

[0074] In a fire extinguishing system configured in this manner, a repair material is provided that seals the opening of the hole from the outside of the secondary piping, so that outside air will not be introduced through the hole even if negative pressure is created inside the secondary piping.

[0075] A method for manufacturing a fire extinguishing system according to one aspect includes a step of providing a sprinkler system having sprinkler piping that normally stores water on a first floor of a building and a second floor that is above or below the first floor, identifying a location of a leak from the sprinkler piping on either the first floor or the second floor, attaching a repair material to the outside of the sprinkler piping so as to seal the leak location, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

[0076] In the method for manufacturing a fire extinguishing system configured as above, a negative pressure sprinkler system can be constructed by repairing a sprinkler system that normally holds water. As a result, the negative pressure sprinkler system can be manufactured at low cost.

[0077] Another BureauA method for manufacturing a fire extinguishing system according to the above aspect includes a step of providing a sprinkler system having sprinkler piping that does not normally contain water on a first floor of a building and a second floor above or below the first floor, identifying a location of a leak from the sprinkler piping on either the first floor or the second floor, attaching a repair material to the outside of the sprinkler piping so as to seal the location of the leak, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

[0078] In the method for manufacturing a fire extinguishing system configured in this manner, a negative pressure sprinkler system can be constructed by repairing a sprinkler system that does not normally contain water. As a result, the negative pressure sprinkler system can be manufactured at low cost.

[0079] Appendix 1 is a fire extinguishing system provided in at least one of a first area and a second area different from the first area, the fire extinguishing system comprising a sprinkler head, a negative pressure sprinkler system having a secondary pipe with a negative pressure inside that supplies water to the sprinkler head, and a negative pressure pump that maintains the negative pressure sprinkler system in a negative pressure state under normal conditions, the secondary pipe having a hole formed therein that penetrates the secondary pipe in the thickness direction, and the fire extinguishing system further comprising a repair material that seals the opening of the hole from the outside of the secondary pipe.

[0080] Appendix 2 is a manufacturing method for a fire extinguishing system, in which a sprinkler system having sprinkler piping that normally stores water is provided in a first area and a second area different from the first area, a leak point from the sprinkler piping in either the first area or the second area is identified, a repair material is applied to the outside of the sprinkler piping to seal the leak point, and then a negative pressure pump is connected to the sprinkler piping to form a negative pressure sprinkler system.

[0081] Appendix 3 is a manufacturing method for a fire extinguishing system, in which a sprinkler system having sprinkler piping that does not normally contain water is provided in a first area and a second area different from the first area, and a negative pressure sprinkler system is constructed by identifying a location of a leak from the sprinkler piping in either the first area or the second area, attaching a repair material to the outside of the sprinkler piping so as to seal the location of the leak, and then connecting a negative pressure pump to the sprinkler piping.

[0082] The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims, not by the embodiments described above, and is intended to include the equivalent meanings of the claims and all modifications within the scope of the claims. [Explanation of symbols]

[0083] 1 sprinkler system, 2 water pump, 3 control device, 4,101,201 primary piping, 5 negative pressure pump, 100 first floor, 100a,200a pressurized sprinkler system, 100b negative pressure sprinkler system, 102,202 secondary piping, 103,203 sprinkler head, 104,204 detector, 105,205 valve, 109 negative pressure pipe, 110 leak location, 111 repair material, 200 second floor, 1020 hole, S301,S302,S303 step.

Claims

1. A method for manufacturing a fire extinguishing system provided in a first area and a second area different from the first area, the method comprising: identifying a water leakage point from a sprinkler pipe of the normal pressure or pressurized sprinkler system; attaching a repair material to an outside of the sprinkler pipe so as to plug the water leakage point; and then connecting a negative pressure pump to the sprinkler pipe to form a negative pressure sprinkler system; A method for manufacturing a fire extinguishing system, wherein the fire extinguishing system comprises a negative pressure sprinkler system provided in the first area and a normal pressure or pressurized sprinkler system provided in the second area.

2. 2. The method for manufacturing a fire extinguishing system according to claim 1, wherein the second zone normal or pressurized sprinkler system includes a sprinkler head, and a metal in the sprinkler head melts due to heat of a fire, thereby releasing water from the sprinkler head without a signal from a detector.

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