JP7650826B2 - Method for manufacturing a fire extinguishing system - Google Patents

Description

The present invention relates to a fire extinguishing system and a method for manufacturing the same.

Conventionally, a wet sprinkler is disclosed in Patent No. 3,264,939.

Patent No. 3264939

Conventional sprinkler systems had the problem that water would continue to be sprayed from the sprinkler head if the sprinkler head malfunctioned.

According to one aspect, a fire extinguishing system 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.

In a fire extinguishing system configured in this manner, sprinkler systems of the required type can be installed in the required locations.

Preferably, the second zone normal or pressurized sprinkler system includes a sprinkler head in which metal melts in the sprinkler head due to heat from a fire, thereby releasing water from the sprinkler head without a signal from a detector.

In a fire extinguishing system configured in this manner, the normal pressure or pressurized sprinkler system in the second zone is not linked to a detector, so if the metal in 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 there is no need for coordinated control of the first and second zones. This reduces the introduction cost.

The manufacturing method for the above-mentioned fire extinguishing system involves providing a normal pressure or pressurized sprinkler system in a first area, identifying the location of a leak from the sprinkler piping of the normal pressure or pressurized sprinkler system, attaching a repair material to the outside of the sprinkler piping to seal the leak, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

In the method for manufacturing a fire extinguishing system configured in this manner, a negative pressure sprinkler system can be constructed by repairing the sprinkler system in the first area. As a result, a negative pressure sprinkler system can be manufactured at low cost.

11A to 11C are diagrams for explaining a manufacturing method of a fire extinguishing system. FIG. 1 is a schematic diagram of a fire extinguishing system before repair. FIG. 1 is a schematic diagram of a fire extinguishing system after repair. FIG. 6 is an enlarged cross-sectional view of a water leakage point shown in an area surrounded by I- V in FIGS. 3 and 5. FIG. 2 is a schematic diagram of a fire extinguishing system according to another aspect.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Method of manufacturing a fire extinguishing system)
Fig. 1 is a diagram for explaining a method for manufacturing a fire extinguishing system. As shown in Fig. 1, in the method for manufacturing 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.

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 on the first floor of the building and on 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.

The secondary piping of a sprinkler system is the piping that is connected to the sprinkler head. The piping from the water pump to the valve is called the primary piping of a sprinkler system.

One way to identify leaks from secondary piping is, for example, if the secondary piping 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 piping near the stain. If the secondary piping is filled with gas, a pressure sensor can be installed in the secondary piping, and if there is a large decrease in pressure per unit time, the secondary piping can be investigated as a leak, and the location of the leak can be identified.

Generally, leaks are likely to occur from the thin walled parts of secondary piping. For example, the ends of secondary piping are often threaded and connected to fittings. Threaded parts tend to be thin walled, so leaks can occur from these parts.

Once the leak has been identified, remove any liquid from the secondary piping. If the secondary piping is filled with gas, it is not necessary to remove the gas.

Leaks from the pipes of a typical pressurized or non-pressurized sprinkler system progress through the following mechanism: If a long period of time passes after the sprinkler system is 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.

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 a later process, the pressure inside the secondary pipe is negative, so if the leak is repaired from the outside of the secondary pipe, the repair material is subjected to a force that draws the repair material inward, making it difficult to remove, and repairing from the inside of the secondary pipe is practically impossible, so repairing the secondary pipe from the outside is less expensive than replacing the secondary pipe.

The leak is repaired in one of the first and second areas where the leak occurred, and the secondary piping is not repaired in the other area.

When carrying out repairs, it is preferable to first clean the outside of the secondary piping 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 wheel.

The leak location is identified and the hole is repaired from outside 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. It would also increase construction costs. Therefore, the leak is stopped by repairing the hole from the outside with repair material. A negative pressure sprinkler system will be constructed later, so although the repair material may be sucked toward the hole by negative pressure, it will not be pressurized from the hole to the outside. Therefore, the repair material will not peel off.

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 inside the secondary pipe, and the repair material is fixed to the leak location.

In areas 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 does not have to be filled with liquid, or it can 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. 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. Other areas function as non-negative pressure sprinklers.

In the case of a wet negative pressure 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 discharged only from the sprinkler.

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 released only from the sprinkler.

The advantage of installing a negative pressure sprinkler system in only 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.

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

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

(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.

A 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.

The primary piping 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 piping rises 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 piping is stopped by a valve, and when the valve is opened, the water in the primary piping is sent to the secondary piping. The opening and closing of the valve is controlled by a computer.

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.

A sprinkler head is a closed type sprinkler head with multiple holes for releasing water. The sprinkler head has a heat-sensitive mechanism (fusible metal pieces). Under normal conditions, the holes for releasing water and the secondary piping are shielded within 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.

The negative pressure system has a negative pressure pipe that is connected to the secondary pipe, and a negative pressure pump that creates 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.

The negative pressure pump generates negative pressure. The negative pressure pump may consist of a main unit and a standby unit. In this case, it can cover the entire facility's usage even in the event of a breakdown or maintenance. When used in medical facilities, the sucked-in air containing germs and bacteria is collected by a suction filter to prevent these from contaminating the atmosphere.

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

The negative pressure piping and the secondary piping are connected at a connection point. This ensures that under normal conditions there is negative pressure inside the secondary piping.

When the negative pressure sprinkler system is a wet negative pressure sprinkler system, under normal conditions, the secondary piping is under negative pressure and water is present in the secondary piping. By creating negative pressure, water can be prevented from being released from the sprinkler head even if the sprinkler head is damaged. To prevent water from moving from the secondary piping to the negative pressure pipe, a membrane or gas-liquid separator that allows water vapor to pass but not water may be installed near the connection point. Since there is negative pressure in the secondary piping, the water evaporates. To replenish the water, a valve may be opened to refill the secondary piping if the water level decreases.

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

The detection system has a fire detector and a computer. If a fire breaks out within 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.

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

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

Primary piping 4 is connected to water pump 2. The output of water pump 2 is controlled by control device 3. The output of water pump 2 can be changed continuously. Water is supplied to water pump 2 from a water tank (not shown). This water does not need to have impurities added to it, and rust inhibitors, etc. may be added to it.

A primary pipe 101 for the 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 the secondary pipe 102. The opening and closing of the valve 105 is controlled by the control device 3.

A number 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 during a fire. During a fire, this portion melts and a liquid (water) serving as a fire extinguishing agent is supplied from the secondary piping 102 to the first floor 100 via the sprinkler heads 103.

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.

When the meltable portion of the sprinkler head 103 melts due to heat, water from the secondary piping 102 is released through the sprinkler head 103 onto the first floor 100.

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 the other primary pipes 101 and 201.

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 water, which is a fire extinguishing agent, is supplied from the secondary piping 202 through the sprinkler heads 203 to the second floor 200. The secondary piping 202 may or may not be filled with water.

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 has been filled with water beforehand, the water pressure in the secondary pipe 202 increases by opening the valve 205.

If the sensor 104 can be reused in the non-negative pressure sprinkler system and the negative pressure sprinkler system 100b, it is reused.

When the meltable part of the sprinkler head 203 melts due to heat, water from the secondary piping 202 is released through the sprinkler head 203 onto the second floor 200.

Figure 3 is a schematic diagram of the fire extinguishing system after repair. As shown in Figure 3, assume that a leak point 110 occurs in the secondary piping 102. In this case, the leak point 110 is repaired from the outside. Furthermore, the secondary piping 102 is connected to the 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 negative pressure inside the secondary piping 102.

Figure 4 is a cross-sectional view of a leaking area. As shown in Figure 4, at the leaking area 110, a hole 1020 is opened in the secondary piping 102. This hole is plugged from the outside of the secondary piping 102 with repair material 111.

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.

The secondary pipe 102 on the first floor 100 may be filled with water while being under negative pressure, or it may not be filled with water. When filling with water, the water is likely to evaporate because the secondary pipe 102 is under negative pressure. When the water in the secondary pipe 102 evaporates and the water level drops, the valve 105 is opened to replenish the water in the secondary pipe 102.

When the secondary piping 102 is not filled with water, it operates as a dry type negative pressure sprinkler.

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 be a non-negative pressure sprinkler system, and the second floor may be a negative pressure sprinkler system.

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 create a negative pressure sprinkler system on the second floor 200 as well.

Oxygen and the like contained in the water in the piping forms holes 1020 as pinholes. The presence of the holes 1020 allows water to flow out from the holes 1020. After the position of the holes 1020 is identified, the holes 1020 can be blocked from the outside with a repair material 111.

Examples of repair materials 111 include aluminum tape, tape made of glass fiber cloth impregnated with resin, and gummed tape. It is also possible to form the repair material 111 by welding a metal plate to the secondary piping 102.

The negative pressure sprinkler system 100b was originally a pressurized or non-pressurized sprinkler system, but after the formation of hole 1020, hole 1020 was blocked and the system was modified to a negative pressure system.

The sprinkler system 1 comprises a sprinkler head 103, a negative pressure sprinkler system 100b having a secondary pipe 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 normal negative pressure state, and the secondary pipe 102 has a hole 1020 formed therein that penetrates the secondary pipe 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 pipe.

The operation of the negative pressure sprinkler system 100b will now be described. When a fire breaks out on the first floor 100, which is 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 fills 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 fills the secondary pipe 102 under negative pressure under normal conditions. At this time, the driving force of the negative pressure pump 5 may be weakened from that in the steady state.

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.

Compared to a dry sprinkler system (pre-action sprinkler system) in which the secondary piping is under normal pressure under normal conditions, the negative pressure sprinkler system 100b according to the embodiment has the following effects. In a normal pressure dry sprinkler system, the 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 under negative pressure, so water can be sprayed from the sprinkler head 103 early. 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 under negative pressure, so water is quickly filled in the secondary piping 102, and water can be sprayed from the sprinkler head 103 early.

The secondary pipe 102 is one that has been used in a pressurized or non-pressurized sprinkler system, so 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.

The sprinkler system 1 as a fire extinguishing system is provided on the first floor 100 as a first area and on the 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.

In a fire extinguishing system configured in this manner, a sprinkler system of the required type can be installed in the required location. Note that, 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.

Figure 5 is a schematic diagram of a fire extinguishing system according to another aspect. As shown in Figure 5, the fire extinguishing system 1 according to another aspect differs from the fire extinguishing system 1 shown in Figures 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 has a sprinkler head 203, and water is discharged from the sprinkler head 203 without a signal from the sensor when the metal in the sprinkler head 203 melts due to the heat of the fire. In other words, the sprinkler head 203 is not connected to the control device 3. 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 embodiments of Figures 3 and 4. Furthermore, the secondary piping 102 may be manufactured by a method in which a hole 1020 is provided and repaired with a repair material 111. The secondary piping 102 may not have a hole 1020. If the holes 1020 are not provided, the repair material 111 is not provided either.

When the sprinkler heads 203 discharge water without a signal from the sensor and control device 3, the only factor that determines the conditions for discharging water from the sprinkler heads 203 on the second floor 200 is the melting temperature of the metal inside the sprinkler heads 203, making it easier to control the conditions for discharging water. This allows the sprinkler system 1 to be introduced at low cost.

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, the secondary pipe has a hole formed therein that penetrates the secondary pipe in the thickness direction, and further includes a repair material that seals the opening of the hole from the outside of the secondary pipe.

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.

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 water leak point 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 water leak point, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

In the manufacturing method of a fire extinguishing system configured in this way, a negative pressure sprinkler system can be constructed by repairing a sprinkler system that normally holds water. As a result, a negative pressure sprinkler system can be manufactured at low cost.

According to another aspect , a method for manufacturing a fire extinguishing system includes a sprinkler system having sprinkler piping that does not normally contain water, which is provided on a first floor of a building and on 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, applying 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.

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

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, comprising 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, the secondary pipe having a hole formed therein that penetrates the secondary pipe in the thickness direction, and further comprising a repair material that seals the opening of the hole from the outside of the secondary pipe.

Appendix 2 is a method for manufacturing 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 so as to seal the leak point, and then a negative pressure pump is connected to the sprinkler piping to form a negative pressure sprinkler system.

Appendix 3 is a method for manufacturing 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 leakage 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 leakage, and then connecting a negative pressure pump to the sprinkler piping.

The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is indicated by the claims rather than the above-described embodiments, and is intended to include the meaning equivalent to the claims and all modifications within the scope.

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 Leaking location, 111 Repair material, 200 Second floor, 1020 Hole, S301, S302, S303 Step.

Claims (2)

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

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