JPH09137482A - Fire preventive water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to install many fire preventive water tanks, by taking in city water when the water level gets down to a specified position by using a water level detection means and discharging water through a discharge pipe when the water level gets up to an allowable level by introducing rainwater. SOLUTION: A fire preventive water tank 1 is constituted of a settling chamber 11 and a water storage chamber 12 and installed in a half-basement of a private building site near the boundary against the adjacent road side. When the water level of the retained water in the water tank 1 goes down to the water level C, the level is detected by a water level switch 1a and city water is automatically supplied continuously through a water supply pipe 10 until the level gets to the level B to always hold water at least up to the level C. Rainwater is led to the water tank 1 through an inflow pipe 6. When the water level goes up to the level A, water is discharged to the outside from the discharge pipe 8. And hence, water does not overflow from the water tank 1. Accordingly, a head space can be secured between the discharge opening 10a of the water supply pipe 10 and the water level A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire protection water tank, and more particularly to a rain water / clean water combined fire protection water tank.

[0002]

2. Description of the Related Art Fire fighting water used by fire fighting organizations to suppress fires in the event of a fire includes artificial water such as fire hydrants, fire tanks and pools, and natural water such as rivers, ponds, lakes and seas. .

Natural water, as well as artificial water, plays an important role as fire water, but it may become unusable or the place of water intake may be restricted depending on the season. on the other hand,
According to the 1992 White Paper on Firefighting, edited by the Fire Department, fire hydrants account for 73.7% of total water use.
The proportion of fire protection water tanks is only 24.9%.

By the way, when a large-scale earthquake occurs, a fire is very likely to occur, but since there is a high possibility that the supply of tap water will be stopped due to the breakage of the water pipe, a fire hydrant is used as a countermeasure against the fire caused by the earthquake. You can't count on firefighting using fire. Actually January 17, 1995
In the Great Hanshin Earthquake that took place on the day, it is a new memory that fire fighting by fire hydrants caused a significant hindrance due to water interruption. Also, it was proved by the Great Hanshin Earthquake that firefighting activities using natural water such as rivers and seas do not function well due to restrictions on water intake locations when a large earthquake occurs. Therefore, promotion of the installation of fire protection water tanks is required as a countermeasure against fires caused by earthquakes.

On the other hand, according to the Disaster Relief Act, emergency water supply in the event of a disaster is originally a responsibility of prefectures and municipalities,
A certain scale of water storage facilities for earthquake disasters is beginning to be installed in various places, but if such a water storage facility is also used as a fire water supply, according to the water supply facility design guidelines issued by the Japan Water Works Association,
It is said that it must have a constant water storage capacity of 40 m ³ or more, or a water intake capacity of 1 m ³ or more per minute, and a water supply capacity of 40 minutes or more continuously (By the way, a fire engine that goes straight to the fire site) a 1.5m ³ the capacity of the water tank, which is provided to the capacity of the water of the tank car tank to transport the water to the expert can have a maximum of one of 10m ³ is at the moment).

[0006]

However, if an attempt is made to install a water storage facility according to the above guidelines, the installation location will naturally be limited due to its large scale,
In a city, it can be installed only in a park, a public building site, or a road. On the other hand, a fire does not always occur near the location of the water storage facility.
Therefore, even if a large-scale water storage facility is installed, if a fire occurs in a place far away from the water storage facility, it is highly likely that the water storage facility will not be useful for extinguishing the fire.

In addition, when a fire occurs, people tend to rely on fire fighting activities by a fire engine first. However, as is clear from the recent Great Hanshin Earthquake, if the road is cut off by the earthquake, the fire engine will be fired. Getting to the scene can be very difficult or even impossible at all. Therefore, if you wait for the fire truck to arrive, there is a high possibility that the fire will spread and you will be out of control.

The present inventor believes that even if the installation of the fire protection water tank is promoted, the above problems cannot be solved unless the conventional idea is changed.

That is, in an emergency such as a large-scale earthquake, the initial extinguishing of a fire is the most important issue for preventing the spread of damage, and the local voluntary disaster prevention organization can be set up without waiting for the arrival of fire engines. It should be done by the main body. For that purpose, it is necessary to have a fire protection tank in the immediate vicinity of the place where the fire occurred. If a large number of fire protection water tanks are installed in each area, the problem of water storage will be solved naturally.

Further, in the conventional fire protection water tank, once the tap water has been filled into the fire protection water tank, the water remains stored unless a fire occurs or the water is used for exercises. Not only cannot effectively use the tap water in
There is concern about deterioration of water quality such as water spoilage. On the other hand, some local residents have voluntarily installed fire protection tanks for using rainwater, but if only rainwater is used, it may not be useful for extinguishing fires in the event of rain if it does not rain for a long time. There is also.

The present invention has been made in view of the above problems, and a purpose thereof is a relatively small-scale combined rainwater / water supply type fire protection tank intended to be installed in large numbers for local residents. Is to provide.

[0012]

[Means for Solving the Problems] A fireproof water tank is composed of a settling chamber and a water storage chamber which are separated by a partition provided with a water passage, and rainwater is introduced into the settling chamber from a position near the top of a side wall. By connecting a pipe, a water supply pipe for introducing tap water from the uppermost part to the water storage chamber and a discharge pipe for discharging water from the upper side wall are connected, and the water level is detected from a predetermined position by a water level detection means provided in the water storage chamber. When it descends, tap water is introduced from the water supply pipe until the water level rises by a predetermined distance from the predetermined position, and the height at which the lowest part of the discharge pipe is connected is set as the allowable water level of the fire protection water tank by introducing rain water. When the water level exceeds the allowable water level, the water is discharged from the discharge pipe until the water level is lowered to the allowable water level.

Further, when a fire occurs in a normal time, it is characterized in that water can be replenished directly from the water mains and the digestive activity can be continuously performed.

Further, an elevated water tank is provided above the fire protection water tank, and water is pumped from the fire protection water tank to the elevated water tank to be used as a middle water supply.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic structure of a fire protection water tank according to the present invention. First, the general structure of the fire protection water tank according to the present invention will be described with reference to FIG.

The fire protection water tank 1 is composed of a settling chamber 11 and a water storage chamber 12, and is installed in a semi-underground portion near the boundary with the road side on the site of the private house 5. A water collecting pipe 52, which collects rainwater by the gutter 51 and introduces it into the fire preventing water tank 1, is connected to the side wall of the settling chamber 11 of the fire preventing water tank 1 through the water collecting basin 3 and the introducing pipe 6. A water supply pipe 10 for supplying public tap water to the fire protection water tank 1 is connected to the upper part of the water storage chamber 12 of the fire protection water tank 1, and a pumping pipe for pumping water into the elevated water tank 2 for use as middle water in the water storage chamber 12. 21 and a fire-extinguishing water pipe 7 for supplying water in the water storage chamber 12 for extinguishing a fire in an emergency, and a discharge pipe 8 for discharging the water to the outer side groove 9 is connected to the side wall of the water storage chamber 12. Has been done.

Prior to starting the use of the fire protection water tank 1, public tap water is introduced from the water supply pipe 56 by the water supply pipe 10 to fill the water to a certain level of the water surface of the fire protection water tank 1. After that, the rain falling on the roof of the private house 5 is collected by the gutter 51 and introduced into the water collecting pipe 52. Although rainwater may be directly introduced from the water collection pipe 52 into the fire protection water tank 1, in the present embodiment, once the rainwater is introduced from the water collection pipe 52 into the water collection basin 3, the rainwater having a constant water level is collected in the water collection basin 3. When collected, rainwater is introduced into the fire protection water tank 1 through the introduction pipe 6.

Further, when the water in the fire protection water tank 1 exceeds a certain level, the water is discharged from the discharge pipe 8 to the outer side groove 9. On the other hand, the water drawn from the water pipe 21 is once introduced into the elevated water tank 2 provided at the upper part of the fire protection water tank 1, one end is connected to the elevated water tank 2 and the other end is the toilet 53 in the private house 5 or the external faucet. It can be used for flushing the toilet or watering the garden through the water supply pipe 4 connected to the water pipe 54.

Next, the structure of the fire protection water tank 1 and its peripheral portion in the present embodiment will be described in more detail with reference to FIG.

A water collecting tank 3 into which rain water is introduced from a water collecting pipe 52
Has a bottom deeper than the position where the introduction pipe 6 is connected, and a certain amount of water introduced from the water collection pipe 52 to the water collecting basin 3 collects and is connected to a position near the top of the fire protection water tank 1. When the height of the lowermost portion of 6 is exceeded, water is poured into the fire protection water tank 1 through the introduction pipe 6. The introduction pipe 6 is connected slightly above the allowable water level (the water surface indicated by A in the figure) in the fire protection water tank 1. The tip of the introduction pipe 6 on the side of the water collecting basin 3 is attached with a curved pipe facing downward, and by using the water collecting basin 3 as a kind of trap basin, sediments or floating substances mixed with rainwater and flowing into the water collecting basin 3 are introduced. Things and insects are prevented from getting into the fire protection water tank 1.

The inside of the fire protection water tank 1 is divided into a settling chamber 11 and a water storage chamber 12 by a partition wall 14. A water inlet 1 for introducing water from the settling chamber 11 to the water storage chamber 12 is provided in the partition wall 14.
3a is provided, and a water pipe 13 having a downward bent tip is attached to the settling chamber 11 side of the water passage 13a. In this way, the inside of the fire protection water tank 1 is divided into the settling chamber 11 and the water storage chamber 12, because when the amount of precipitation is large, inflowing substances such as leaves and dust cannot be dealt with only by the catchment basin 3.
It is predicted that the water will enter the fire protection water tank 1, and if the inflow material spreads over the entire fire protection water tank 1, cleaning will be wide and it is not desirable for management, so the inflow material is stored in the settling chamber 11 side and the water in the water storage chamber 12 is stored. It is intended to be used.

Manholes 1c are provided above the settling chamber 11 and the water storage chamber 12 for the purpose of cleaning the inside.
Is provided. Further, the ventilation hole 1d provided in the upper part of the settling chamber 11 is provided with a U-shaped trap 8 of the water collecting tank 3 and the discharge pipe 8.
It is provided for the purpose of not breaking the sealing water accumulated in a (here, "sealing" means sealing with water to block the air inside the device and the outside air). . In addition,
In order to keep the water in the fire protection water tank 1 hygienic, it is desirable to attach an insect screen to the vent hole 1d so that insects and small animals do not enter.

A communication hole 15 is provided at a position near the bottom of the partition wall 14 of the fire protection water tank 1. This is because when the water is pumped from the water storage chamber 12 by the fire extinguishing water pipe 7 in an emergency and the water level drops below the water passage 13a, the water is further pumped from the water storage chamber 12 to continue the precipitation chamber 1
In order to prevent that the water level of No. 1 and the water level of the water storage chamber 12 are different and pressure is applied to the partition wall 14, a communication hole 15 is provided to average the water levels of the settling chamber 11 and the water storage chamber 12. . It is desirable to install a mesh in the communication hole 15 so that dust in the settling chamber 11 does not enter the water storage chamber 12.

An electrode type liquid level switch 1a unit is provided above the water storage chamber 12 and includes electrode rods b, c,
d is suspended in the water storage chamber 12. Liquid level switch 1a
Is interlocked with the solenoid valve 1b provided in the water supply pipe 10 for introducing tap water into the water storage chamber 12, and when the water level in the water storage chamber 12 becomes below the water surface (indicated by the one-dot chain line C) with which the electrode rod c contacts. When the solenoid valve 1b is opened and tap water flows in, and the water level in the water storage chamber 12 becomes higher than the water surface (indicated by the chain line B) with which the electrode rod b contacts, the solenoid valve 1b is closed and the inflow of tap water stops. There is. Even if the amount of precipitation is insufficient, safety is ensured so that it can function as a fire protection water tank, and at the same time, it cannot be stopped as a water supply system. Therefore, always secure a certain amount of stored water in the fire protection water tank 1. It was done like this. Since a large amount of water was drawn from the fire extinguishing water pipe 7 at the time of fire extinguishing or continuously drawing water from the water drawing pipe 21 at the time of water interruption, the water surface in the water storage chamber 12 descended, and the water surface contacted by the electrode rod d (dashed line D (Indicated below), the user is warned when the alarm sounds or the lamp flashes.

The elevated water tank 2 is provided in order to apply a constant pressure to the water used as the tap water by raising the water to a certain height, and to store an amount of water commensurate with the amount of the tap water used. An electrode-type liquid level switch 2a unit is provided above the elevated water tank 2, and electrode rods e, f, g are suspended in the elevated water tank 2. The liquid level switch 2a is a pump P provided in the middle of the water drawing pipe 21.
When the water level of the elevated water tank 2 is below the water surface with which the electrode rod f is in contact, the pump P1 operates and pumps water from the water storage chamber 12 through the water pipe 21 into the elevated water tank 2. When the water level in the elevated water tank 2 rises above the water level in contact with the electrode rod e, the operation of the pump P1 is stopped. Further, when the water level in the elevated water tank 2 drops below the water level in contact with the electrode rod g, a warning is issued.

A ventilation hole 2d is provided in the upper portion of the elevated water tank 2. The ventilation hole 2d is provided for the purpose of introducing air into the elevated water tank 2 in order to smooth the flow of water to the water pipe 4. It is desirable to attach an insect screen to the ventilation holes 2d so that insects and the like do not enter the elevated water tank 2 and to keep the elevated water tank 2 hygienic. Further, the vent hole 2d has a liquid level switch 2a and a pump P1 due to a failure or the like.
It also has a function of discharging the water overflowing into the elevated water tank 2 to the outside when the above does not operate.

A manhole 2c for cleaning the inside of the elevated water tank 2 is provided. A drain valve 2f is provided at the bottom of the elevated water tank 2 for directly discharging the contaminated water to the outside when the inside of the water tank is cleaned.

The water intake 21b at the tip of the pumping pipe 21 inserted into the water storage chamber 12 for pumping water to the elevated water tank 2 has a tap water from the water supply pipe 10 when, for example, the water supply is interrupted. An opening is provided near the bottom of the water storage chamber 12 so that the stored rainwater can always be used even when there is no replenishment. Similarly, the water intake 7b at the tip of the fire extinguishing water pipe 7 inserted into the water storage chamber 12 for supplying water for extinguishing a fire is
An opening is provided near the bottom of the water storage chamber 12 in order to maximize the use of the water in the fire protection water tank 1. Further, it is desirable to attach a mesh to the water intake ports 21b and 7b so as not to damage the pump etc. by sucking the inflow material that has flowed into the water storage chamber 12 because the sedimentation chamber 11 cannot deal with it.

When a fire occurs and the water in the fire protection water tank 1 is used for extinguishing fire, a local voluntary disaster prevention hose, a permanent fire hose and a pump are connected to the fire hydrant port 7a of the fire protection water pipe 7 to suck up the water. The fire hydrant port 7a must be installed in a place that is easy for a person involved in fire extinguishing to use. Therefore, in the present embodiment, the fire hydrant opening 7a is provided outside the boundary line of the site of the private house 5 (on the road side).

The discharge pipe 8 is connected to a position close to the top of the side wall of the fire protection water tank 1 but slightly lower than the height to which the introduction pipe 6 is connected, so that there is a large amount of precipitation and the rain water in the fire protection water tank 1 is steadily increasing. When it flows in and the water level in the water storage chamber 12 exceeds the height of the lowest part of the discharge pipe 8 (the height of the water surface indicated by A in the figure), the water is guided into the discharge pipe 8 and the outside of the discharge pipe 8. It is designed to be poured into the side groove 9. That is, the height at which the lowest part of the discharge pipe 8 contacts is the allowable water level in the fire protection water tank 1.

The discharge pipe 8 is provided with a U-shaped trap 8a. This is provided to prevent the inflow of gas or odor generated in the gutter 9 and to prevent insects or the like from entering the fire protection water tank 1 through the discharge pipe 8 from the opening on the gutter 9 side. It has been done. The water stored in the fire protection water tank 1 is intended to be used for tap water and fire extinguishing, but as a drinking water in an emergency (for example, when water is cut off due to a large earthquake etc. and the water becomes extremely short). It was also considered to keep the water as hygienic as possible so that it can be used.

The discharge pipe 8 is also provided with a check valve 8b. When the fire protection water tank 1 is installed in a low area, it is expected that the water level in the gutter 9 will rise above the water level in the fire protection water tank 1 due to flooding, etc. This is to prevent the water in the fire protection water tank 1 from being contaminated.

Here, the operation of water in the embodiment shown in FIG. 2 will be summarized once again. When the water level of the water stored in the fire protection water tank 1 drops below the water level indicated by the alternate long and short dash line C, the liquid level switch 1a detects the change and automatically starts the supply of tap water from the water supply pipe 10, Since tap water is continuously supplied until the water level shown by B is reached, water is always stored in the fire protection water tank 1 at least up to the position of the alternate long and short dash line C unless the water is cut off. There is. On the other hand, rainwater flows into the fire protection water tank 1 from the introduction pipe 6, and when the water level rises above the water surface indicated by A, it is discharged to the outside from the discharge pipe 8 and the water in the fire protection water tank 1 does not overflow. Therefore, a head drop space can be secured between the outlet 10a of the water supply pipe 10 and the water surface indicated by A.

In normal times, water is pulled up from the water storage chamber 12 to the elevated water tank 2 by the pumping water pipe 21 and then used for toilets etc. via the middle water pipe 4. Therefore, it is not only useful for saving water in the water supply but also for the fire protection water tank. Since the stored water convection by using the water in 1 prevents the water from spoiling, it is ultimately possible to use the water in the fire protection water tank 1 as drinking water.

Next, a modification of the embodiment shown in FIG. 2 will be described with reference to FIG. 2 is a view mainly showing the water storage chamber 12 side of the fire protection water tank 1 shown in FIG.
Since the same reference numerals as those in FIG. 2 represent the same components as those described in FIG. 2, the description will focus on the parts different from those in FIG.

In the embodiment shown in FIG. 2, water is pumped from the fire extinguishing water pipe 7 for extinguishing a normal fire (when a fire occurs when water is not cut off due to a large earthquake or the like). Even if tap water is replenished from the water supply pipe 10, there is a limit to the amount of water that can be used as compared with a normal fire hydrant, and it is conceivable that water will be insufficient and continuous fire fighting activities will be hindered.

Therefore, in the fire protection water tank 1 shown in FIG. 3, the fire water supply pipe 16 directly connected to the water mains (not shown) via the gate valve 16c is connected to the uppermost part of the fire protection water tank 1 to supply water. Water is supplied directly from the main pipe.
That is, in the event of a fire, open the gate valve 16c and replenish water so that the fire can be continuously extinguished,
A fire extinguishing hose is attached to the fire hydrant port 7a to discharge water for extinguishing the fire. In this way, it can be used exactly like a normal fire hydrant.

For that purpose, it is desirable that the gate valve 16c is installed so that a handhole is installed on the road surface and the gate valve 16c can be opened and closed therein.

Further, another modification of the embodiment shown in FIG. 2 will be described with reference to FIG. FIG. 4 is a view mainly showing the water storage chamber 12 side of the fire protection water tank 1 shown in FIG. 2, and the same reference numerals as those in FIG. 2 represent the same components as those described in FIG. A description will be given centering on parts different from those in FIG.

In the fire protection water tank 1 shown in FIG. 4, the solenoid valve 16
A fire water supply pipe 16 directly connected to a water main (not shown) via b is connected to the uppermost part of the fire protection water tank 1 so that water can be directly supplied from the water main. Further, by providing a liquid level switch 16a, when the water level in the fire protection water tank 1 drops below a certain height (in FIG. 4, the water level shown by the one-dot chain line E with which the electrode rod 16e contacts), the water supply pipe 1 in case of fire is automatically
The solenoid valve 16b attached to the No. 6 is opened so that water can be supplied into the fire protection water tank 1 from the water main. By doing so, it is possible to automatically start the water supply from the water supply pipe 16 at the time of the fire without having to manually start the water supply from the water supply pipe 16 at the time of the fire, so that the fire extinguishing activity can be smoothly continued. Becomes In this case, if the solenoid valve 1b is closed when the solenoid valve 16b is opened, the supplied water does not pass through the meter of the owner of the private house 5, so that the water charge may be added to the private house 5 side. Disappear.

Further, as shown in FIG.
A solenoid valve 16b and a gate valve 16c may be provided in parallel with the water supply pipe 16 in case of a fire which is directly connected to. If you do this,
Even if the electromagnetic valve 16b becomes inoperable due to a power failure, the gate valve 16c can be manually opened to start the replenishment of water from the water main, so that the fire-extinguishing activity can be continued without any trouble.

In carrying out the present invention, in consideration of using the water in the fire protection water tank 1 as drinking water in the worst case, the roof of the private house 5 and the gutter 51 are made of materials that do not generate harmful substances. In consideration of earthquake countermeasures, the fire protection water tank 1 is made of a material (eg, stainless steel, FR
It is desirable to consider using P (fiber reinforced plastic) etc.). Next, a second embodiment of the fire protection water tank according to the present invention will be described with reference to FIG.

The fire protection tank according to the second embodiment is a public facility (for example, a school, a public hall, a hospital, etc.) in which a victim is expected to be housed in the event of a major earthquake, etc. (For example, city hall, police, fire department, public health center, etc.), factory, large-scale office, etc.

The fire protection water tank 31 according to the second embodiment shown in FIG. 6 is composed of at least three water tanks connected in order of a first water tank 31a, an intermediate water tank 31b, and a final water tank 31c. .

The first water storage tank 31a has almost the same structure and the same function as the fire protection water tank shown in the first embodiment (FIGS. 1 and 2), and is the same as FIG. 1 and FIG. The reference numerals of 1 represent the same components as described in FIGS. 1 and 2. Therefore, in order to avoid redundant description, the configuration of the first water storage tank 31a will be described focusing on the main elements. The first water storage tank 31a is composed of the settling chamber 11 and the water storage chamber 12, and the rainwater is introduced from the introduction pipe 6. The water level switch 1a to monitor the water level and, if necessary, the water supply pipe 10
From now on, tap water is supplied.

The intermediate water storage tank 31b is provided mainly for the purpose of storing water, and has a special function in addition to the function of introducing water from the first water storage tank 31a and discharging the water to the final water storage tank 31c. Does not have. It is possible to increase the amount of stored water by increasing the number of intermediate water storage tanks 31b as far as the installation space allows.

The final water storage tank 31c is also provided mainly for the purpose of storing water, and when water is introduced from the intermediate water storage tank 31b and the water level in the water storage tank exceeds the allowable water level, the water is discharged from the discharge pipe 8 to the outside. Its only function is to release it to.

The first water storage tank 31a and the intermediate water storage tank 31b, and the intermediate water storage tank 31b and the final water storage tank 31c are connected by a water pipe 36 which is a water flow passage and a ventilation pipe 33 which is an air flow passage, respectively. .

The functions other than the introduction pipe 6 and the settling chamber 11 (for example, the liquid level switch 1a, the water supply pipe 10 and the like) have a first water storage tank 31a, an intermediate water storage tank 31b, and a final water storage tank 31c.
Even if it is installed in any water tank of the throat, the overall function does not change.
In this embodiment, various functions are concentrated in the first water storage tank 31a, and rainwater is taken into the first water storage tank 31a from the introduction pipe 6. When the fire protection water tank 31 is installed in a rainy area, a considerable amount of rain water can be expected to be taken in. Therefore, by changing the lengths of the electrode rods b and c, the water supply pipe 10
There is a great advantage in that it can be adjusted so that a large amount of rainwater can be used without relying on tap water supplied through the pipe.

Also in the second embodiment, the water in each of the first water storage tank 31a, the intermediate water storage tank 31b, and the final water storage tank 31c is connected to the elevated water tank 2 so as to be used as the intermediate water supply. The water pipe 21 is inserted into the final water storage tank 31c,
Further, a water intake pipe branched from the water drawing pipe 21 is inserted into the first water storage tank 31a and the intermediate water storage tank 31b. It should be noted that instantaneous switching valves 34a and 34b are provided at the branch portion where the pipe for water intake branches from the water pump pipe 21 toward the first water storage tank 31a and the intermediate water storage tank 31b.

Similarly, the first water storage tank 31a and the intermediate water storage tank 3
1b, in order to use the water in each water tank of the final water tank 31c for fire extinguishing, the fire water pipe 7 connected to the fire hydrant port 7a on the road side is inserted into the first water tank 31a and branched from the water pipe 7. The water intake pipes are the intermediate water storage tank 31b and the final water storage tank 3
It is inserted in each water tank 1c. In addition, fire extinguisher pipe 7
From the intermediate water storage tank 31b to the final water storage tank 31c, a momentary switching valve 35b is provided at the branch portion where the water intake pipe branches.
35c is provided.

Further, the first water storage tank 31a and the intermediate water storage tank 3
1b, a fire water supply pipe 16 for replenishing water from the water main to continue fire extinguishing activities in each water storage tank of the final water storage tank 31c is connected to the top of the first water storage tank 31a, The refueling pipe branched from the intermediate water tank 31
b, the final water storage tank 31c is connected to the top of each water storage tank.

A pressure plate 37 is provided at the bottom of the fireproof water tank 31 for the purpose of supporting the weight of the entire fireproof water tank 31, and it is generally preferable that the fireproof water tank 31 is constructed of thick reinforced concrete.

Water passage 36 which is a flow path of water between each water tank
Are provided between the first water storage tank 31a and the intermediate water storage tank 31b and between the intermediate water storage tank 31b and the final water storage tank 31c, and the positions connected to the respective water storage tanks are in the first water storage tank 31a. The height corresponds to the water level at which the supply of tap water from the water supply pipe 10 is started. Since the water passage 36 is expected to be the most fragile portion in the structure of this embodiment, it is desirable to use a flexible pipe.

Further, in this embodiment, a monitoring manhole 32 is provided in order to facilitate management of the water pipe 36 and each water storage tank. This monitoring manhole 32 is for monitoring water leakage, and it is most desirable that a person can directly enter and monitor it. Therefore, it is desirable to remove the wall around the joint portion of the water pipe 36 so that the joint portion can be directly observed with the eyes. By doing so, even if water leaks from the joint, repair can be easily performed.

Further, the monitoring manhole 32 is provided with a monitoring hole 38. If water leakage occurs in any of the first water storage tank 31a, the intermediate water storage tank 31b, and the final water storage tank 31c, a considerable amount of water pressure is applied to the outer wall of the monitoring manhole 32. Water always blows out from the provided monitoring hole 38. Therefore, it is possible to easily estimate in which reservoir layer the water leakage is occurring, by checking from which direction the water is ejected.

On the other hand, the first water storage tank 31a and the intermediate water storage tank 31
b. Since the volume of the space in each water storage tank of the final water storage tank 31c changes according to the change in the water level in each water storage layer, it is necessary to allow air to flow in and out between the upper space of each water storage tank and the outside. There is. Therefore, it is conceivable to provide a ventilation hole at the top of each water tank so that air can be taken in and out from the upper space. However, in the present embodiment, the first water storage tank 31a
A ventilation hole 1d is provided in each of the water storage tanks, and the upper space of each water storage tank is connected by a ventilation pipe 33 to allow air to flow between the water storage layers. As a result, the portion protruding from the main body of the fire protection water tank 31 to the ground is reduced, so that it does not become an obstacle and is easy to manage.

Next, the instantaneous switching valves 34a, 34b, 35b, 35c will be described with reference to FIGS. 6, 7 and 8. These momentary switching valves are attached to the branch portion of the pumping water pipe 21 and the branch portion of the fire extinguishing water pipe 7. For example, the lever handle is rotated by 60 degrees to change the water intake passage at the branch portion where the three pipes intersect. It is provided for the purpose of enabling one-touch operation. In the momentary switching valve according to the present embodiment, when the water intake passage from one water storage tank is opened, the water intake passage from the first adjacent water storage tank is closed.

For example, when a fire occurs due to a great earthquake and fire extinguishing activities are carried out using the fire protection water tank 31, if water is cut off at the same time, it is impossible to replenish water from the water main by the water supply pipe 16 at the time of fire extinguishing. However, that does not mean that fire fighting activities cannot be interrupted. Therefore, in order to continue the fire extinguishing activities smoothly, it is necessary to be ready to use the water from the next water tank quickly even if the water in one water tank is used up.

In the present embodiment, instantaneous switching valves 35b and 35c are attached to the branch portion of the fire extinguishing water pipe 7, and instantaneous switching is performed beforehand, for example, to use water from the final reservoir 31c toward the first reservoir 31a. Valves 35b and 35c
Are switched so that water can be taken from each water tank. When water intake is started in this state, water can be first taken from the final reservoir layer 31c. Next, when the water in the final water storage tank 31c is used up, the instantaneous switching valve 35c is operated to operate the final water storage tank 31c.
Immediately after closing the water intake channel from c, the intermediate water storage tank 31
Water can be taken from b. In addition, the intermediate reservoir 31b
If the instantaneous switching valve 35b is operated to close the water intake passage from the intermediate water storage layer 31b when the water is completely used up, water can be immediately taken from the first water storage tank 31a.

Similarly, the instantaneous switching valves 34a, 34b provided in the water pump 21 are used for switching the water intake passage for water used as the tap water.

To give a desirable example of the method of using the fire protection water tank 31 when the water is cut off, if the tap water is used in order from the first water storage tank 31a toward the final water storage tank 31c, It is possible to maintain the function of the water supply to the full capacity, while the water used for fire extinguishing activities should be used from the final reservoir 31c toward the first water tank 31a. As a result, even if the water in the final water storage tank 31c is used, the water in the first water storage tank 31a can be used as the tap water.

Next, referring to FIGS. 7 and 8, the instantaneous switching valve 3
An example of the configuration of 4a, 34b, 35b, 35c will be described. Since the configuration is the same for both instantaneous switching valves,
7 and 8, the momentary switching valve 34a will be described as an example.

In FIG. 7, (a) is a plan view of the instantaneous switching valve 34a, (b) is a front view of the instantaneous switching valve 34a, (c) is a horizontal sectional view of the instantaneous switching valve 34a, and (d) is (c). It is sectional drawing which cut | disconnected by the AA line of the momentary switching valve 34a shown by. 8, (a) is an exploded perspective view of the instantaneous switching valve 34a, (b) is an inverted plan view of the upper lid 62, (c) is a plan view of the valve box 64, and (d) is shown in (b). A of the upper lid 62
-A sectional perspective view taken along the line A, (e) a sectional perspective view taken along the line BB of the sluice valve 63 shown in (a), (f) C of the valve box 64 shown in (c). It is a cross-sectional perspective view cut by the -C line.

As shown in FIG. 8A, the instantaneous switching valve 34a is composed of a lever handle 61, an upper lid 62, a gate valve 63 and a valve box 64 in order from the top. Through holes 61b and 62b are provided in the centers of the lever handle 61 and the upper lid 62, respectively, and a hole 64b is formed in the center of the bottom of the valve box 64 as shown in FIG. 8 (f). On the other hand, as shown in FIG. 8 (e), the sluice valve 63 is provided with a slightly longer projection 63b on the upper surface and a shorter projection 63d on the opposite surface. As shown in FIG. 7D, the protrusion 63d of the gate valve 63 is fitted into the hole 64b, and the protrusion 6
3b is penetrated through the through hole 62b of the upper lid 62, the upper lid 62 is fixed to the upper surface of the valve box 64 by a screw (not shown), and the tip of the protrusion 63b protruding from the through hole 62b is fitted into the through hole 61b of the lever handle 61 to form a partition. Instantaneous switching valve 3 so that valve 63 operates in conjunction with lever handle 61
4a.

As shown in FIGS. 8B and 8D, the upper lid 62 is
Two fan-shaped partition plates 62a are attached to the rear surface of the valve so as to face each other. Similarly, as shown in FIGS. 8C and 8F, two fan-shaped partition plates are provided on the bottom of the valve box 64. 64a is attached so as to face each other, and both partition plates 62a and 64a
Are installed at positions where they are exactly overlapped when viewed from above, the operating range of the sluice valve 63 is the range where each partition plate is not installed when viewed from above, that is, the range indicated by the arrow in FIG. 7 (c). Limited to

As shown in FIG. 6, the instantaneous switching valve 34a is
It also serves as a Y-joint for pipes from three directions, that is, the pumping pipe 21 from the intermediate water storage tank 31b, the pumping water pipe 21 toward the elevated water tank 2, and the pumping water pipe 21 branched for water intake from the first water storage tank 31a. Adjacent two of the three connection ports provided on the valve box 64
The angles of the sides are equal to 120 degrees, and the sluice valve 63 has a left and right direction of 30 with respect to the direction of the connection port from the center toward the elevated water tank 2.
It is possible to operate each time. Therefore, by simply rotating the lever handle 61 by 60 degrees, it is possible to easily switch whether the water flow path is directed from the first water tank 31a only to the elevated water tank 2 or from the intermediate water tank 31b only to the elevated water tank 2. be able to.

[0069]

Since the fire protection water tank according to the present invention is constructed as described above, the following effects can be obtained. (1) Since we try to use rainwater as much as possible,
It contributes to saving water and effective use of resources. (2) Since the water stored in the fire protection water tank is always used as tap water, it leads to effective use of water, and the water in the fire protection water tank is convected to prevent deterioration of water quality. (3) Even if the amount of precipitation is insufficient, it can be automatically replenished from the public water supply, so that the function of the water supply can be maintained at all times and a certain amount of water for fire protection can be reliably secured. (4) Even if rainwater is used, it is mixed with rainwater by introducing rainwater through a catchment basin, or by dividing the inside of the fire protection tank into a settling chamber and a water storage chamber and using the water in the water storage chamber. Since it has a structure that eliminates floating substances and insects, it is possible to keep the water hygienic and, in the worst case, use the water in the water storage room as drinking water. (5) If the fire prevention water tank according to the present invention is installed in all the buildings of a housing complex in the newly constructed land, the size of the rainwater reservoir that is forced along with the construction of the land can be significantly reduced. (6) By connecting the water supply pipe at the time of fire to the fire protection water tank so that water can be supplied directly from the water main, it is possible to continue fire extinguishing activities against fires during normal times without any problems. (7) A fire protection water tank, a first water tank connected to each other, having a function of taking in rainwater, monitoring the water level, and supplementing tap water when necessary, and at least one intermediate water tank,
If it is configured with a final water storage tank that has the function of discharging water when it exceeds the allowable water level, it can be installed in a relatively large-scale facility, and the amount of water storage will be increased by increasing the number of intermediate reservoirs. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a fire protection water tank according to the present invention.

FIG. 2 is a diagram showing a configuration of an embodiment of a fire protection water tank according to the present invention.

FIG. 3 is a diagram showing a modification of the embodiment shown in FIG.

FIG. 4 is a diagram showing a modification of the embodiment shown in FIG.

FIG. 5 is a diagram showing a modification of the embodiment shown in FIG.

FIG. 6 is a diagram illustrating a configuration of a second embodiment.

FIG. 7 is an example of the structure of an instantaneous switching valve, (a) is a plan view of the instantaneous switching valve 34a, (b) is a front view of the instantaneous switching valve 34a, and (c) is a horizontal sectional view of the instantaneous switching valve 34a. , (D)
[Fig. 3] is a cross-sectional view taken along line AA of the instantaneous switching valve 34a shown in (c).

FIG. 8 is a detailed view of parts of the instantaneous switching valve shown in FIG.
(A) is an exploded perspective view of the instantaneous switching valve 34a, (b) is an inverted plan view of the upper lid 62, (c) is a plan view of the valve box 64, (d).
Is a sectional perspective view of the upper lid 62 taken along the line A-A shown in (b), (e) is a sectional perspective view taken along the line BB of the gate valve 63 shown in (b), and (f) is Valve box 64 shown in (c)
It is a cross-sectional perspective view taken along line C-C of FIG.

[Explanation of symbols]

 1 Fireproof water tank 1a Liquid level switch 1b Solenoid valve 1c Manhole 1d Vent hole 2 Elevated water tank 2a Liquid level switch 2c Manhole 2d Vent hole 2f Drain valve 3 Water collecting pipe 4 Water supply pipe 5 Private house 6 Inlet pipe 7 Fire extinguishing water pipe 7b Intake port 8 Discharge pipe 8a U-shaped trap 8b Check valve 9 Gutter 10 Water supply pipe 11 Settling chamber 12 Water storage chamber 13 Water supply pipe 13a Water inlet 14 Partition wall 15 Communication hole 16 Fire water supply pipe 16a Liquid level switch 16b Solenoid valve 16c Gate valve 21 b Pumping pipe 21 Intake port 31a First water storage tank 31b Intermediate water storage tank 31c Final water storage tank 32 Manhole 33 Ventilation pipe 34a, 34b, 35b, 35c Instantaneous switching valve 36 Water passage pipe 37 Pressure plate 51 Gutter 52 Water collection pipe 53 Toilet 54 Outer water tap 56 Water pipe

Claims (5)

[Claims] 1. A fire protection water tank comprising a settling chamber and a water storage chamber, which are separated by a partition wall having a water passage, and an inlet pipe for introducing rainwater from a side wall near the top is connected to the settling chamber. ,
When a water supply pipe for introducing tap water from the top and a discharge pipe for discharging water from the upper side wall are connected to the water storage chamber and the water level is lowered from a predetermined position by the water level detection means provided in the water storage chamber, Tap water is introduced from the water supply pipe until the water level rises by a predetermined distance from the predetermined position, and the height of the side wall to which the lowest part of the discharge pipe is connected is set as the allowable water level of the fire protection water tank, and the water level is changed by introducing rain water. A fire protection water tank which discharges water from the discharge pipe until the water level drops below the permissible water level. 2. An elevated water tank is provided above the fire protection water tank,
The fire protection water tank according to claim 1, wherein water is pumped from the fire protection water tank to the elevated water tank to be used as middle water. 3. Rainwater is introduced from the introduction pipe through a water collecting basin, the lowest part of the water collecting basin is lower than the lowest part of the introducing pipe, and the tip of the introducing pipe on the water collecting basin side is The fire protection tank according to claim 1, wherein the rain water is introduced into the fire protection tank from the introduction pipe when the rain water having a constant water level is accumulated in the water collection tank by bending toward the bottom side of the water collection tank. 4. The fire protection water tank according to claim 1, further comprising a fire extinguisher pipe connected to the pump for drawing fire extinguishing water from the water storage chamber. 5. The fire protection water tank according to claim 1, wherein a fire water supply pipe is connected to the uppermost portion of the water storage chamber to supply water for extinguishing fire from the water mains.