JP7828405B2 - Fire extinguishing system - Google Patents

Description

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

A conventional wet sprinkler is disclosed in Patent No. 3,264,939.

Patent No. 3264939

With conventional sprinkler systems, there was a problem where water would continue to be sprayed from the sprinkler head if it malfunctioned.

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.

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

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

In a fire extinguishing system configured in this way, the atmospheric 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 implemented at low cost because there is no need for coordinated control of the first and second zones. This reduces installation costs.

The manufacturing method for the above fire extinguishing system involves providing a normal pressure or pressurized sprinkler system in the first area, identifying the location of a leak from the sprinkler piping of the normal pressure or pressurized sprinkler system, applying 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 this method of manufacturing a fire extinguishing system, 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.

10A to 10C 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 the water leakage point shown in the area surrounded by I and V in FIGS. 3 and 5. FIG. 1 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.
(Fire extinguishing system manufacturing method)
FIG. 1 is a diagram illustrating 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, this 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 with two or more floors. The sprinkler system is installed 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 installed on the same floor or on the same ground.

The secondary piping of a sprinkler system refers to the piping connected to the sprinkler head. In contrast, 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, it is assumed that there is a leak, and the location of the leak can be identified by investigating the secondary piping.

Leaks are generally more likely to occur in areas of secondary piping where the wall thickness is thin. 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 in these areas.

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

Leaks from the pipes of a typical pressurized or non-pressurized sprinkler system progress through the following mechanism: Over a long period of time after the sprinkler system is installed, moisture in the pipes causes corrosion to progress from the inside of the pipes to the outside, eventually forming holes that penetrate from the inside of the pipes to the outside.

The leak is repaired from the outside of the secondary piping (step S302). Methods for repairing the leak include applying tape made of an organic or inorganic material to the outside of the secondary piping, welding the leak from the outside of the secondary piping, injecting a gel or sol-like substance into the leak from the outside of the secondary piping, or injecting a highly viscous fluid into the leak from the outside of the secondary piping and then allowing the fluid to harden. The reason for repairing the leak from the outside of the secondary piping is that, in a later process, negative pressure is created inside the secondary piping, so if the leak is repaired from the outside of the secondary piping, the repair material will be subjected to a force that pulls it inward, making it difficult to remove. Therefore, repairing the secondary piping from the inside is virtually impossible. Therefore, repairing the secondary piping from the outside is less expensive than replacing the secondary piping.

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

When carrying out repairs, it is preferable to clean the outside of the secondary piping before carrying out the repairs 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 after surface grinding with a grinding stone.

The leak location is identified and the hole is repaired from the outside of the secondary piping. While it is possible to remove the piping containing the leak, removing the piping would require a major renovation and would increase the amount of work required to protect the protected area. Construction costs would also be higher. 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 due to negative pressure, it will not be pressurized outward from the hole. Therefore, the repair material will not peel off.

A vacuum pump is connected to the repaired secondary pipe (step S303). By connecting the vacuum pump to the secondary pipe, a negative pressure can be created inside the secondary pipe. When the secondary pipe is placed under negative pressure, the repair material placed on the outside of the secondary pipe is drawn inside the secondary pipe, and the repair material is fixed at 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 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. 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-type negative-pressure sprinkler , the secondary pipe is filled with liquid and is under negative pressure, causing the liquid to evaporate from the secondary pipe. To replenish the evaporated liquid, a valve located at the boundary between the secondary and primary pipes is opened, allowing liquid to flow from the primary pipe to the secondary pipe. To enable this control, a sensor must be installed to detect the amount of liquid in the secondary pipe, and a control device must be installed that opens the valve based on the sensor to supply liquid from the primary pipe to the secondary pipe as needed. In the event of a fire, the suction by the negative-pressure pump can be stopped or its suction force can be reduced, so that the liquid in the secondary pipe does not flow to the negative-pressure pump and only the water in the secondary pipe is released from the sprinkler.

In the case of dry negative pressure sprinklers, there is no need to consider the loss of liquid in the secondary piping as described above, so there is no need to control the valve to prevent this. However, in the event of a fire, it is possible to stop the suction by the negative pressure pump or reduce 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 is that renovation costs are lower than if all areas were to be installed with a negative pressure sprinkler system.

Secondly, 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 differ 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 intolerant, 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 compartment on a lower floor and a second compartment on an upper floor. Note that the negative pressure sprinkler system does not necessarily have to be used in a moisture-intolerant environment, and may also be used in environments where pressurized or non-pressurized sprinkler systems are used.

A negative pressure sprinkler system has a primary pipe, a secondary pipe connected to the primary pipe, a sprinkler head installed on the secondary pipe, a valve installed at the boundary between the primary and secondary pipes, and a water pump for sending water to the primary pipe.

The primary pipe is filled with water. This water is pressurized by a water pump. Water is supplied to the water pump from a fire water tank. Water may also be supplied to the water pump from an elevated water tank on the top floor of the building. The primary pipe rises vertically from the water pump to the top of the building, branching 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.

The secondary pipe is connected to a valve. The secondary pipe is located in the compartment for fire extinguishing. The secondary pipe is located in the ceiling of the compartment. The secondary pipe is equipped with multiple sprinkler heads. The number of sprinkler heads is determined by the size of the compartment.

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

The negative pressure system includes a negative pressure pipe connected to the secondary pipe, and a negative pressure pump that creates negative pressure within the negative pressure pipe. Simply connecting the negative pressure pipe to the secondary pipe can create a negative pressure sprinkler system.

A vacuum pump generates negative pressure. The vacuum pump may consist of a main unit and a backup 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 it from contaminating the atmosphere.

The negative pressure pipe connected to the negative pressure pump rises vertically from the pump to the top floor of the building, branching 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.

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

If 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 can be installed near the connection point. Because there is negative pressure in the secondary piping, the water evaporates. To replenish the water, a valve can be opened to add water to the secondary piping if the water level decreases.

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

The detection system includes 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 that has a sprinkler head and secondary piping as a sprinkler piping for supplying water to the sprinkler head, with the secondary piping normally maintained at a negative pressure, negative pressure piping, and a negative pressure pump as a negative pressure device for supplying negative pressure to the secondary piping and negative pressure piping.

Figure 2 is a schematic diagram of the fire extinguishing system before repair. As shown in Figure 2, sprinkler system 1, which is the fire extinguishing system before repair, is installed on the first floor 100 as the first area (first protected area) and on the second floor 200 as the second area (second protected area). A pressurized sprinkler system 100a is installed on the first floor 100. A pressurized sprinkler system 200a is installed 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.

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

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.

Multiple sprinkler heads 103 are installed on the secondary piping 102. The sprinkler heads 103 are installed on the first floor 100. The sprinkler heads 103 have a part that melts when exposed to heat during a fire. In the event of a fire, this part melts and a liquid fire extinguishing agent (water) 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, it sends a signal to the control device 3. The control device 3 instructs the water pump 2 to increase its output. 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 pipe 102 is released onto the first floor 100 via the sprinkler head 103.

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 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 with heat in the event of a fire. In the event of a fire, this portion melts and water, a fire extinguishing agent, is supplied from the secondary piping 202 to the second floor 200 via the sprinkler heads 203. The secondary piping 202 may or may not be filled with water.

A detector 204 for detecting heat is installed on the second floor 200. When the detector 204 detects heat, it sends a signal to the control device 3. The control device 3 instructs the water pump 2 to increase its output. The control device 3 opens the valve 205. Even if the secondary pipe 202 is not filled with water, the opening of the valve 205 causes the secondary pipe 202 to be filled with water. 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 opening of the valve 205 increases the water pressure in the secondary pipe 202.

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

When the meltable portion of the sprinkler head 203 melts due to heat, water from the secondary pipe 202 is released onto the second floor 200 via the sprinkler head 203.

Figure 3 is a schematic diagram of the fire extinguishing system after repair. As shown in Figure 3, assume that a leak 110 occurs in the secondary piping 102. In this case, the leak 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 water leak location. As shown in Figure 4, at the water leak location 110, there is a hole 1020 in the secondary piping 102. This hole is sealed 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 may also occur in the secondary pipe 202 on the second floor 200. In that case, the secondary pipe 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 the secondary pipe 102 is under negative pressure, or it may not be filled with water. If water is filled, the negative pressure in the secondary pipe 102 makes it easy for the water to evaporate. When the water in the secondary pipe 102 evaporates and the water level drops, the valve 105 is opened to replenish the secondary pipe 102 with water.

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

In sprinkler system 1, a negative pressure sprinkler system is installed on the first floor 100, and a non-negative pressure sprinkler system is installed on the second floor 200. It is also possible for the first floor 100 to have a non-negative pressure sprinkler system and the second floor to have a negative pressure sprinkler system.

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

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 through the holes 1020. After the location of the holes 1020 is identified, the holes 1020 can be blocked from the outside with repair material 111.

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

Negative pressure sprinkler system 100b was originally a pressurized or non-pressurized sprinkler system, but was converted to a negative pressure system by forming hole 1020 and sealing hole 1020.

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 that supplies water to the sprinkler head 103, and a negative pressure pump 5 that maintains the negative pressure sprinkler system 100b in a normal negative pressure state. 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.

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 from the fire. The detected information is sent from the detector 104 to the control device 3, which is a computer. The control device 3 then sends a signal to the valve 105 to open it. The control device 3 then activates 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 piping 102, which is normally empty of water and under negative pressure. In the wet-type negative pressure sprinkler system 100b, water fills the secondary piping 102 under negative pressure under normal conditions. At this time, the driving force of the negative pressure pump 5 may be weakened compared to the steady state.

The heat from the fire melts the heat-sensitive mechanism of the sprinkler head 103, which 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, extinguishing the fire.

Compared to a dry sprinkler system (pre-action sprinkler system) in which the secondary piping is normally under normal pressure, the negative pressure sprinkler system 100b according to the embodiment has the following advantages. In a normal pressure dry sprinkler system, in the event of a fire, the pump is activated and water is filled into the secondary piping. However, at this time, the air in the secondary piping is compressed by the water, so the secondary piping does not fill 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, allowing water to be sprayed from the sprinkler heads 103 quickly. This solves the problem of delayed water spraying from the sprinkler heads, which was a drawback of conventional dry sprinklers (pre-action sprinklers). Even in the case of the dry negative pressure sprinkler system 100b, the secondary piping 102 is under negative pressure, allowing water to be quickly filled into the secondary piping 102, allowing water to be sprayed from the sprinkler heads 103 quickly.

The secondary piping 102 is previously used in pressurized or non-pressurized sprinkler systems, so manufacturing costs can be reduced compared to installing a new one. Furthermore, repair material 111 is attached to the outside of the secondary piping 102, but because the inside of the secondary piping 102 is normally under negative pressure, water will not leak again from the hole 1020.

The sprinkler system 1, which serves as a fire extinguishing system, is installed 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 installed on the first floor 100 and a normal pressure or pressurized sprinkler system 200a installed 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, sprinkler systems of the required type can be installed in the required locations. Note that, although the manufacturing method described above involves repairing holes 1020 with repair material 111, holes 1020 do not necessarily have to be provided. If holes 1020 are not provided, 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 installed on the second floor 200. The atmospheric or pressurized sprinkler system 200a on the second floor 200 includes a sprinkler head 203. The metal inside the sprinkler head 203 melts due to the heat of the fire, causing water to be discharged from the sprinkler head 203 without a signal from the sensor. In other words, 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 embodiments of Figures 3 and 4. Furthermore, the fire extinguishing system may be manufactured by drilling a hole 1020 in the secondary piping 102 and repairing it with a repair material 111. The hole 1020 in the secondary piping 102 need not be drilled. If the hole 1020 is not provided, the repair material 111 is not provided either.

When the sprinkler heads 203 release water without a signal from the sensor and control device 3, the only factor determining the conditions for water release 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 water release conditions. This allows the sprinkler system 1 to be installed at low cost.

A fire extinguishing system according to one aspect 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 that supplies water to the sprinkler head and has a negative pressure inside, and a negative pressure pump that normally maintains the negative pressure sprinkler system in a negative pressure state. 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 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 sprinkler system having sprinkler piping that normally stores water, which is installed on a first floor of a building and a second floor above or below the first floor, and includes the steps of identifying a leaking point from the sprinkler piping on either the first floor or the second floor, applying a repair material to the outside of the sprinkler piping to seal the leaking point, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

In this method of manufacturing a fire extinguishing system, 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 installed on a first floor of a building and on a second floor above or below the first floor, and includes a step of 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 to seal the leak, and then connecting a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

In this method of manufacturing a fire extinguishing system, 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 installed 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 that supplies water to the sprinkler head and has a negative pressure inside, and a negative pressure pump that normally maintains the negative pressure sprinkler system in a negative pressure state, 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 installed in a first area and a second area different from the first area, and a negative pressure sprinkler system is constructed by identifying a leak point from the sprinkler piping in either the first area or the second area, applying a repair material to the outside of the sprinkler piping to seal the leak point, and then connecting a negative pressure pump to the sprinkler piping.

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 installed in a first area and a second area different from the first area, and the method identifies the location of a leak from the sprinkler piping in either the first area or the second area, applies a repair material to the outside of the sprinkler piping to seal the leak, and then connects a negative pressure pump to the sprinkler piping to form a negative pressure sprinkler system.

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, not by the above-described embodiments, and is intended to include all modifications equivalent to the claims and within their 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 Leak location, 111 Repair material, 200 Second floor, 1020 Hole, S301, S302, S303 Step.

Claims (2)

A fire extinguishing system provided in a first area and a second area different from the first area, the first area and the second area being provided in the same building;
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;
In the negative pressure sprinkler system, water for fire extinguishing is supplied via a water pump, a first pipe to which water is supplied from the water pump, and a second pipe connected to the first pipe, and in the normal pressure or pressurized sprinkler system, water for fire extinguishing is supplied via the water pump, the first pipe, and a third pipe connected to the first pipe. The fire extinguishing system of claim 1, wherein the atmospheric or pressurized sprinkler system in the second zone 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.