JPH0571733B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fire hydrant to which a fire hose is connected during extinguishing a fire.

(Prior Art and Problems to be Solved by the Invention) Fire hydrants currently installed in cities are directly connected to water mains. This water main is always filled with tap water at a predetermined pressure, so even if the water main is not completely sealed, bad water (water unsuitable for tap water, such as underground water) can enter the water main. does not invade. However, when extinguishing a fire, if the amount of water discharged by a fire pump exceeds the water supply capacity of the water main, the pressure within the water main may drop and bad water may enter the water main.

Also, a method of installing a fire prevention water tank for extinguishing a fire is widely used, but the size of the water tank itself is limited and it is not possible to store a large amount of water for fire prevention. That is, if an underground water tank is used, it will be shallow and require a large installation area due to the suction lift of a fire pump, and it is virtually impossible to install it anywhere other than public land with a large site such as a park. In addition, the only above-ground water tank used is a small, simple fire extinguishing water tank, and the amount of water in it is extremely small. Furthermore, water stored in fire tanks cannot be used as water for domestic use in times of disaster (other than fires), as bacteria will breed as the water is left for long periods of time.

(Means for Solving the Problems) In view of the above-mentioned problems, this proposal proposes a fire hydrant equipped with a ground-mounted circulating water storage tank. In other words, the fire hydrant according to the present invention is characterized in that a fire hose connection part is provided in an above-ground water storage tank that has an inflow path from the water main and an outflow path to the water main and serves as a circulation path. An inlet pipe and an outlet pipe are installed inside the tank, an inlet pipe opening is formed in the lower part of the tank, an outlet pipe opening is formed in the upper part of the tank, and a siphon break hole is provided at the top of the outlet pipe. It is further equipped with a water tap connected to the lower part of the water storage tank.

(Function) Tap water enters the water storage tank from the water main through the inflow path, and returns from the water storage tank to the water main through the outflow path, and a predetermined amount of water is always stored in the water storage tank. The stored water is constantly circulated. In addition, when extinguishing a fire, stored water is used as fire extinguishing water, and water can also be supplied from the water mains.

(Example) Next, examples of the present invention will be described.

The fire hydrant according to this proposal consists of a circulation system of a water storage tank 1 installed on the ground and a discharge system of the water storage tank 1.The circulation system consists of an inflow pipe 2 and an outflow pipe 3, and the inflow pipe 2 is connected to the water main. The pipe is branched from a and introduced into the water storage tank 1, and the pipe opening is provided in the lower part of the water storage tank 1, and the pipe is H-shaped and has a siphon break hole 4 at the top, and an on-off valve 5 is installed at the branch part. I'll have to intervene. Outflow pipe 3 is water main pipe a
The downstream side of the branch is connected to the inside of the water storage tank 1, and the pipe opening is opened in the upper part of the tank 1, and an on-off valve 5 is connected between it and the water main.
1 is interposed. Further, an on-off valve 52 is provided in the water main between each of the above-mentioned branch points. The discharge system also includes an air valve part 6 provided at the top of the tank, a fire hose connection part 7, and a water tap 8. It is attached to the top of the tank 1, a float body 63 is placed inside the housing 62, and the upper opening of the housing 62 is closed with a lid body 65 having an air hole 64. The fire hose connection part 7 has a suction port body 71 disposed in the inner bottom surface of the water storage tank 1 in a shape that widens toward the end, and connects the top of the suction port body 71 and a discharge port 72 provided on the outside of the water storage tank 1 with a connecting pipe 73. , an on-off valve 74 (only the operating handle is shown) is provided at the discharge port 72 portion. Also, the water tap 8 is the water storage tank 1
It is provided at the tip of a water supply pipe 81 connected to the lowermost surface of the pipe.

When the on-off valve 52 is closed and the on-off valves 5 and 51 are opened, the water (tap water) in the water main pipe a enters the water storage tank 1 through the inflow pipe 2 and flows into the inflow pipe provided in the lower part of the tank. The water is discharged into the tank 1 from the pipe port 2, and when a predetermined amount is stored, it is installed in the upper part of the tank and enters the outflow pipe 3 from the pipe port of the outflow pipe 3 and returns to the water main pipe a. When the water level rises and the float 63 closes the air hole 64, i.e., when the water storage tank is full, the on-off valve 52 is closed and the on-off valves 5 and 51 are left open, the tap water simply passes through the tank 1. There will be. Therefore, the water in the water storage tank 1 is constantly circulated and fresh. When the water level in the water storage tank 1 further decreases, the mouth of the outflow pipe 3 protrudes from the water, stopping the water in the tank from flowing out from the outflow pipe 3, and a siphon brake hole is formed at the top of the inflow pipe 2. 4, even if a pressure drop occurs due to some reason on the upstream side of the water main pipe a, the water in the tank will not flow backwards and flow out from the inlet pipe 2. Therefore, fresh water is always stored in the water storage tank.

In addition, in the event of a fire, the water supply pipe of the pump truck is connected to the fire hose connection part 7, and when the pump truck is operated, the water in the water storage tank 1 is sucked into the pump truck and used for extinguishing the fire. At this time, when the water level in the tank decreases, the float body 63 is lowered and the air hole 64 is opened, so that the suction operation can be easily accomplished, and on the other hand, tap water is supplied from the inflow pipe 2. Therefore, the amount of water that can be discharged from the water storage tank 1 is the amount of water in the water storage tank plus the amount of water supplied from the water main, and has a larger amount of water that can be discharged than a conventional water storage tank. Furthermore, since there is a siphon break hole 4 at the top of the inflow pipe 2, the suction operation does not cause a pressure change (pressure drop in the water main pipe a) on the upstream side of the water main pipe a, so there is no harm to the tap water. There is no risk of water intrusion.

Next, in the event of a disaster, the water in the tank is constantly circulating as described above, so it is always fresh and can be immediately made available for drinking by opening the water tap 8.

(Effects of the Invention) As described above, the present invention provides a water storage tank in the middle of the flow path of the water main, and the water storage tank is provided with a fire hose connection part, so that when extinguishing a fire, the water stored in the tank is In addition, the water supply from the water mains can be used, and a larger amount of fire extinguishing water can be used at the initial stage of extinguishing a fire. Furthermore, if the inside of the tank is used as a circulation path for tap water, the water in the tank will always be fresh and can be used as drinking water in the event of a disaster.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a simple overall view, Fig. 2 is a front view of the tank showing the circulation system of tap water, Fig. 3 is a detailed sectional view of the air valve section, and Fig. 3 is a detailed sectional view of the air valve section. Figure 4 is a partial sectional view of the tank showing the water discharge system. 1 is a water storage tank, 2 is an inflow pipe, 3 is an outflow pipe, 4
is a siphon break hole, 5, 51, 52 are on-off valves, 6 is an air valve part, 61 is a through hole, 62 is a housing, 6
3 is a float body, 64 is an air hole, 65 is a lid body, 7
71 is a fire hose connection part, 71 is a suction port body, 72 is a discharge port, 73 is a connecting pipe, 74 is an on-off valve, 8 is a water tap, and 81 is a water supply pipe.

Claims (1)

[Scope of Claims] 1. A fire hydrant characterized in that a fire hose connecting portion is provided in an above-ground water storage tank that is provided with an inflow path from a water main and an outflow path to the water main and serves as a circulation path. 2 In the fire hydrant described in claim 1,
An inflow pipe and an outflow pipe are installed inside the water storage tank, and the inflow pipe port is formed at the bottom of the tank, the outflow pipe port is formed at the top of the tank, and a siphon break hole is provided at the top of the outflow pipe. A fire hydrant. 3 In the fire hydrant described in claim 1,
A fire hydrant with a water hydrant connected to the lower part of the water storage tank.