JPH1181398A - Stand-pipe housing type fire hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ease the lifting of a stand pipe, and to remove mud and sand easily by installing an inflow port for a fire hydrant at the center of a lower pipe, in which a vertically slidable upper stand pipe, in which an upper end is arranged near a ground surface and a sliding surface is formed of an alloy containing a specific quantity of copper, is housed. SOLUTION: A part or the whole of a sliding bush 3 for preventing seizure of a sliding section is formed in a lower pipe 2 disposed into a cavern section 14 by a copper alloy material having copper content of 50-95%, and an upper stand pipe 1 is housed. The upper stand pipe 1 is lifted automatically by water pressure by water passage at the time of the activity of fire extinguishing, but fire fighting water passed through a gentle shock 9 resists in the opposite direction to the elevation of the upper stand pipe 1 and the sudden lifting of the upper stand pipe 1 is inhibited by forming an inflow port 6a for fire fighting water to the intermediate section of the lower pipe. When the fire hydrant is opened while preventing the elevation of the upper stand pipe 1 by water pressure, fire fighting water, a flow rate of which is increased by the gentle shock 9, is changed into a vortex shape on a lower pipe bottom section 11 and mud and sand are rolled up and discharged, thus easily removing mud and sand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire hydrant which is usually used for extinguishing a fire or the like and which is disposed underground, in which a stand pipe having a fire hose connection portion slides in a lower pipe. This relates to fire hydrants that move up and down.

[0002]

2. Description of the Related Art Conventionally, a fire hydrant has a base for attaching a fire hose to a fire extinguisher, and a base for attaching a fire hose to an underground space provided with a lid made of iron or the like on the ground surface. There is an underground fire hydrant with

[0003]

However, in the case of a ground-type fire hydrant, since the fire hydrant itself protrudes above the ground, a car or a person often crashes at night or during snowfall. In addition, ground-type fire hydrants are made extremely robust for the above-mentioned reasons, etc., and in some cases, protective enclosures and the like may be provided.However, in order to protect the fire hydrants, they are made robust, In some cases, the car did not break and the car and other equipment were damaged, resulting in a major accident.

When the impact of a collision of a car or the like is strong,
Not only was the fire hydrant damaged, but also the pipes buried underground and the fire-extinguishing water on-off valve were sometimes damaged.

In view of the above drawbacks, when an automobile or the like collides with a certain impact force, one part of a connection screw between a fire hydrant portion projecting above the ground and an underground pipe buried underground may be damaged. Damage to the fire hydrant itself and the underground pipes,
A fire hydrant has also been developed that has a structure that protects the vehicle in which it collided.

However, in any case, when the fire hydrant itself is present on the ground, collision of a car or a person is inevitable, resulting in danger or some damage.

In addition to above-ground fire hydrants, there is an underground fire hydrant in which a base for attaching a fire hose is provided in an underground cavity having a lid made of iron or the like on the ground surface. In some cases, a lid cannot be opened, and attaching a fire hose from a snow surface higher than the ground surface to an underground base when snowing is an even more difficult task.

In a so-called underground fire hydrant, there has also been a fire hydrant in which an upper pipe having a base portion and a lower pipe are divided, and the upper pipe slides inside the lower pipe and is stored. Because it is underground, mud and sand tend to accumulate inside the pipe, and the upper pipe does not slide smoothly and does not move halfway, or the pipe may break due to freezing of residual water inside the pipe when not in use. There was also an inconvenience that the drain valve for prevention did not work due to mud or sand.

[0009] In repairing the above-mentioned inconvenience, or damage to the upper and lower pipes, digging up and repairing all the buried parts requires a great deal of cost.

The present invention has been made in view of such problems of the prior art, and in a fire hydrant having an upper stand pipe slidable up and down, the accumulation of mud and sand inside the upper and lower pipes is facilitated. It is an object of the present invention to provide a fire hydrant that has a structure that can be easily repaired and replaced for inconvenience, and reduces the occurrence of seizure on the sliding surface of the upper stand pipe and the lower pipe. .

[0011]

To achieve the above object, a standpipe retractable fire hydrant according to the present invention has a structure in which an upper standpipe slidable up and down can be stored and a fire extinguishing water is provided at the center of the lower pipe. An inlet is provided, and the lower pipe has a structure that can be easily attached to and detached from the fire extinguishing water supply valve, and the sliding surface of the upper and lower pipes contains 70% copper.
It is characterized by being composed of a copper alloy of up to 95%.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional side view showing an embodiment of a stand-pipe retractable fire hydrant according to the present invention. Numeral 8 denotes a valve section for taking in fire extinguishing water from a water pipe or the like buried underground. By opening and closing part 7,
Adjust the flow rate of fire extinguishing water.

The upper stand pipe 1 is usually stored in the lower pipe 2 which is arranged inside an underground cavity 14 opened from the ground surface. In the case of fire extinguishing activities, a lid made of iron or the like is used. The fire extinguishing water flows into the upper stand pipe 1 from the lower pipe bottom 11 when the valve is opened by opening the valve, lifting it up with the handle 12 and connecting the fire extinguishing hose to the base 4 and then operating the valve opening / closing operation unit 7 to open the valve.

At this time, the upper standpipe 1 is automatically lifted by the water pressure. However, by providing the fire extinguishing water inlet in the middle of the lower pipe 2, the fire extinguishing water passing through the buffer gap 9 allows the upper standpipe 1 to be lifted. The resistance in the direction opposite to the upward movement is suppressed, the rapid rise of the upper stand pipe 1 can be suppressed, and a collision with the operator can be prevented, which is safe.

Further, since the fire hydrant is provided underground, mud and sand easily accumulate on the lower pipe bottom 11 and it is very difficult to remove the mud and sand. When the valve is opened and closed by operating the valve opening / closing operation unit 7 in a state where the upper stand pipe 1 is prevented from rising due to water pressure, the fire extinguishing water having a higher flow velocity is swirled at the lower pipe bottom 11 by the buffer gap 9. Then, the mud and sand are rolled up and discharged from the upper stand pipe 1 through the base 4.

A lower pipe 2 and a valve portion 8 are fitted to a hollow portion opened from the ground surface by a rubber gasket 6 by a flange 6.
By connecting via b, if the upper stand pipe 1, lower pipe 2, or any other part is inconvenient, it can be easily replaced without affecting the underground fire extinguishing water supply pipe etc. it can.

Also, when the upper stand pipe 1 is stored in the lower pipe 2 or rises, the outer surface of the upper stand pipe 1 and the sliding bush 3 may slide, seize due to resistance or the like, and lock.

Therefore, by forming part or all of the sliding bush 3 with a copper alloy material having a copper content of 50% to 95%, the seizure of the sliding portion can be solved. When the copper content is 50% or less, the conformability and anti-seizure resistance of the alloy are significantly reduced due to the increase in hardness, and when the copper content is 95% or more, the decrease in hardness and the decrease in fatigue strength are caused by friction reduction. The deformation due to the effect causes water leakage and rattling of the stand pipe, which is not suitable for practical use.

As the material of the sliding bush 3, a lead-based white metal and a tin-based white metal are also effective in addition to the copper alloy.

[0020]

As described above, the stand-pipe retractable hydrant according to the present invention can be stored underground,
In a fire hydrant with a mechanism that the stand pipe moves up and down,
The rising of the standpipe is gentle, collision with the operator can be prevented, and the standpipe can be stored. The mud and sand accumulated at the bottom of the lower pipe can be easily removed.

Further, by forming the sliding portion of the stand pipe and the lower pipe with a copper alloy having a copper content of 50% to 95%, seizure of the sliding portion can be prevented.

Further, by connecting the valve portion and the lower pipe with a flange in the underground cavity opened from the ground surface, the lower pipe and the stand pipe can be easily repaired.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a standpipe retractable fire hydrant, showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stand pipe 2 ... Lower pipe 3 ... Sliding bush 4 ... Base part 5 ... Base cap 6 ... Lower pipe connection flange 6a ... Fire extinguishing water lower pipe flow Inlet, 6b Gasket 7 Valve open / close operation unit 8 Valve unit 9 Cushion gap 10 Drain valve 11 Lower pipe bottom 12 Handle 13・ ・ ・ Ground surface 14 ・ ・ ・ underground cavity 15 ・ ・ ・ cover

Claims (3)

[Claims] 1. A stand-pipe retractable fire hydrant, wherein an inlet for a fire hydrant is provided at the center of a lower pipe having an upper end positioned near the surface of the ground and having a structure capable of storing an upper stand pipe which can be slid up and down. . 2. An underground connection to a water pipe or the like, an operation part of an on-off valve arranged near the surface of the ground, and an outlet of the on-off valve and an outlet of a lower pipe connected so as to be easily detachable. The standpipe retractable fire hydrant according to claim 1, characterized in that: 3. The standpipe according to claim 1, wherein a part or all of a sliding surface of the upper standpipe and the lower pipe is made of a copper alloy having a copper content of 50% to 95%. Retractable fire hydrant.