JP7577604B2 - Fire hydrant equipment - Google Patents

Description

The present invention relates to a fire hydrant device that stores a fire hose with a nozzle attached to the end inside a housing so that it can be freely pulled out.

Conventionally, tunnel fire hydrant devices installed in tunnels on expressways and motorways house a hose with a nozzle at the end and valves in a housing with a fire hydrant door that can be opened and closed. In the event of a fire, an operator opens the fire hydrant door, pulls the hose out of the housing while holding the nozzle, and opens the fire hydrant valve to put out the fire.

Tunnel fire hydrant devices are installed on the walls of the guard passage at 50m intervals along the length of the tunnel along the road, and because shape-retaining hoses are used for the fire hoses, the length of the hoses is 30m, making it possible to cover the protective area on both the left and right sides. This is based on the assumption that if a fire breaks out near the fire hydrant devices installed at 50m intervals along the length of the tunnel, the nearest fire hydrant device cannot be used for firefighting operations, and the worst case scenario is that the adjacent fire hydrant device will be used. For this reason, the effective length of the fire hose pulled out from the fire hydrant device is set to 30m, and the nozzle water discharge range is set to 20m, making it possible to cover the entire protective area (Patent Documents 1 and 2).

The hoses used in fire hydrant devices are required to be long, for example 30 m, and the size of the housing depends on the space required to store the hose. Therefore, when a shape-retaining hose is used, it is necessary to secure storage space for a large hose, which makes the fire hydrant device larger. This leaves room for improvement in terms of ease of use, ease of installation, and resource conservation.

In particular, when the structure of the tunnel body makes it impossible to form a fire hydrant box in the tunnel wall, the fire hydrant device will be installed in the guard passage, for example. In this case, in order to ensure the width of the guard passage, it is necessary to make the depth of the fire hydrant device as small as possible, so it is desirable to make the fire hydrant device thinner.

To solve this problem, a retractable hose has been proposed for use with fire hydrant devices that shrinks to a specified length when not discharging water and expands to the required length when water is being supplied and flows through it (Patent Document 3).

JP 2016-055073 A JP 2018-139704 A JP 2015-012881 A

However, when such an elastic hose that expands when water is passing through it is stored in a contracted state inside the housing of a fire hydrant device, in the same conventional hose storage structure in which a shape-retaining hose of a fixed length is wound inward multiple times, when the hose is pulled out while water is passing through it, the hose that is stored in an inwardly wound state is pressed strongly into the storage section as the hose expands, requiring a larger pulling force than a shape-retaining hose, which can reduce operability.

In addition, when water flows through an elastic hose, the hose may stretch and be pushed outside the fire hydrant device, causing it to become loose. Even in a nearby fire where only a small amount of hose needs to be pulled out, the hose may be pushed out more than necessary, making it difficult to handle.

The present invention aims to provide a fire hydrant device that uses a fire hose that can reduce the hose storage space while also making it easy to pull out the hose.

(Fire hydrant equipment)
The present invention is a fire hydrant device in which a fire hose with a nozzle attached to the tip is stored in a housing so that it can be freely pulled out,
The fire hose is characterized in that a portion of the hose is an elastic hose and the remaining portion is a non-elastic hose.

(Fire hose)
The fire hose has a specified length on the nozzle side that is an elastic hose and the remaining specified length on the opposite side to the nozzle that is a non-elastic hose, and the hose has a standard length of 30 m (second set length (L2)) when water is passing through it.

(Hose length settings for non-elastic hose and elastic hose)
The length of the fire hose in a non-water-passing state is defined as a first set length (L1),
The length of the fire hose in a water-passing state is set to a second set length (L2) that is longer than the first set length (L1);
When the extension ratio of the elastic hose is set to a predetermined set ratio (K),
Based on the first and second set lengths (L1, L2) and the set magnification (K), the hose length (L3) of the non-elastic hose and the hose length (L4) of the elastic hose in a non-water-passing state are calculated and connected.

(Calculation of hose length for non-elastic hose)
The length of the non-elastic hose (L3) is L3 = (L2 - K L1) / (1 - K).
The length of the elastic hose when water is not passing through it (L4) is calculated as L4 = L1 - L3.
and concatenate them.

(Calculation of hose length when no water is passing through an elastic hose)
The length of the elastic hose when water is not passing through it (L4) is L4 = (L2 - L1) / (K - 1)
The length of the non-elastic hose (L3) is calculated as L3 = L1 - L4.
and concatenate them.

(Setting the extension ratio of the elastic hose)
The length of the fire hose in a non-water-passing state is defined as a first set length (L1),
The length of the fire hose in a water-passing state is set to a second set length (L2) that is longer than the first set length (L1);
The hose length of the non-elastic hose is a third predetermined length (L3);
When the hose length of the elastic hose in a non-water-passing state is a fourth set length (L4) obtained by subtracting the third predetermined length (L3) from the first set length (L1),
The extension ratio (K) of the elastic hose is calculated based on the second to fourth set lengths (L2, L3, L4).

(Calculation of elongation ratio)
The extension ratio (K) of the elastic hose is K = (L2 - L3) / L4
is required.

(Effects of fire hydrant devices)
According to the fire hydrant device of the present invention, part of the fire hose is made into an elastic hose that expands when water is passed through it, and the remaining part is made into a non-elastic hose of a fixed length. This shortens the length of the elastic hose when water is not passing through it, thereby reducing the space required to store the hose. This makes it possible to make the fire hydrant device thinner and more compact, thereby improving ease of use and ease of installation.

In addition, by using an elastic hose on the nozzle side of the hose tip and a non-elastic hose such as a shape-retaining hose on the base side of the hose opposite the nozzle side, the non-elastic hose on the base side of the hose does not stretch when water is passing through, so the hose is stored in a stable state and can be pulled out smoothly without coming apart. In addition, the elastic hose on the nozzle side stretches when water is passing through, assisting the hose pull-out force, reducing the hose pull-out force and improving operability.

(Effect of hose length settings for non-elastic hose and elastic hose)
In the case of a fire hydrant device for a tunnel, for example, the hose length of the fire hose in a non-water-passing state is set as a first set length (L1) = 15 m, the hose length of the fire hose in a water-passing state is set as a second set length (L2) = 30 m longer than the first set length (L1), and the extension ratio of the elastic hose is set to a predetermined set ratio (K), for example, 2.5 times, the hose length (L3) of the non-elastic hose is set as L3 = (L2 - K L1) / (1 - K).
=(30-2.5×15)/(1-2.5)
= 5m
The length of the elastic hose when water is not passing through it (L4) is calculated as follows: L4 = L1 - L3 = 15 - 5 = 10 m
It is possible to obtain and concatenate the above.

(Effect of calculating hose length when elastic hose is not passing water)
In addition, under the same conditions of (L1) = 15 m, (L2) = 30 m, and (K) = 2.5, the hose length (L4) of the elastic hose in a non-water-passing state is L4 = (L2 - L1) / (K - 1).
=(30-15)/(2.5-1)
= 10m
The length of the non-elastic hose (L3) is calculated as follows: L3 = L1 - L4 = 15 - 10 = 5 m
It is also possible to obtain and concatenate the above.

(Effect of setting the stretch ratio of the elastic hose)
In addition, in the case of a fire hydrant device for a tunnel, for example, if the hose length of the fire hose in a non-water-passing state is a first set length (L1) = 15 m, the hose length of the fire hose in a water-passing state is a second set length (L2) = 30 m longer than the first set length (L1), the hose length of the non-elastic hose is a third predetermined length (L3) = 5 m, and the hose length of the elastic hose in a non-water-passing state is a fourth set length (L4) = 10 m, the extension ratio (K) of the elastic hose is determined based on the second to fourth set lengths (L2, L3, L4) as K = (L2-L3)/L4.
=(30-5)/10
= 2.5
A 10 m long elastic hose with an elongation ratio K of 2.5 is prepared and can be connected to a 5 m long non-elastic hose.

FIG. 2 is an explanatory diagram showing a fire hydrant device for a tunnel. This is an explanatory diagram showing the internal structure of the fire hydrant device from the front with the fire hydrant door open. FIG. 2 is an explanatory diagram showing the internal structure of the fire hydrant device from a plan view. FIG. 2 is an explanatory diagram showing a cross section of a fire hydrant device as viewed from the side. 1A and 1B are explanatory diagrams showing an embodiment of a fire hose in a water-non-passing state and a water-passing state. FIG. 1 is an explanatory diagram showing a specific embodiment of a fire hose in which a non-elastic hose is set to 5 m and a non-water-permeable elastic hose is set to 10 m. FIG. 13 is an explanatory diagram showing a specific embodiment of a fire hose in which a non-elastic hose is set to 7.5 m and a water-impermeable elastic hose is set to 7.5 m. FIG. 1 is an explanatory diagram showing a specific embodiment of a fire hose in which a non-elastic hose is set to 10 m and a non-water-permeable elastic hose is set to 5 m. FIG. 1 is an explanatory diagram showing an embodiment of a fire hydrant device using a fire hose in which an elastic hose is divided and connected to a non-elastic hose. FIG. 1 is an explanatory diagram showing an embodiment of a fire hydrant device using a fire hose in which a non-elastic hose is divided and connected to an elastic hose.

Below, an embodiment of a fire hydrant device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiment.

[Basic Concept of the Embodiment]
First, the basic concept of the embodiment will be described. The embodiment is generally a fire hydrant device that stores a fire hose with a nozzle attached to the tip in a housing so that it can be freely pulled out, and the fire hose is a part that is an elastic hose and the remaining part that is a non-elastic hose, and typically, a predetermined length on the nozzle side is an elastic hose and the remaining predetermined length on the opposite side to the nozzle is a non-elastic hose.

Here, an "elastic hose" is a hose that is contracted to a predetermined length in a non-water-passing state and expands longitudinally in a water-passing state. A "non-elastic hose" is a hose whose length does not change between a non-water-passing state and a water-passing state, and is a concept that includes, for example, a shape-retaining hose that barely expands or contracts, maintaining a predetermined inner diameter and outer shape. For this reason, the fire hose of this embodiment can be said to be a composite hose in which a non-elastic hose and an elastic hose are connected, and the hose expands as a whole in a water-passing state.

In the case of a fire hydrant device for tunnels, the hose length of the fire hose when water is flowing is, for example, 30 m, but in the case of a fire hose in which a non-stretchable hose and a stretchable hose are connected in this embodiment, the hose length when water is not flowing is, for example, half that, 15 m, and therefore it is possible to reduce the hose storage space of the fire hydrant device to about half that of a conventional non-stretchable fire hose with a hose length of 30 m. If the hose storage space can be reduced by half in this way, for example, the width in the depth direction of the fire hydrant device can be reduced to half that of a conventional device, and by making the fire hydrant device thinner, it is possible to greatly improve workability.

In a fire hydrant device using a fire hose in which a non-elastic hose and an elastic hose are connected, the hose length (L1) of the fire hose in a non-water-passing state, the hose length (L2) that expands in a water-passing state, and the expansion ratio (K) of the elastic hose are predetermined, and based on these, the hose length (L3) of the non-elastic hose and the hose length (L4) of the elastic hose in a non-water-passing state are calculated and connected. Note that the "expansion ratio" is the hose length of the elastic hose expanded in a water-passing state divided by the hose length of the elastic hose contracted in a non-water-passing state.

Here, the relationship between the hose lengths L1, L2, L3, and L4 is L1 = L3 + L4
L2=L3+K・L4
Therefore, for example, the hose length (L3) of a non-elastic hose is L3 = (L2 - K L1) / (1 - K).
The length of the elastic hose when water is not passing through it (L4) is calculated as L4 = L1 - L3.
The above is calculated and concatenated.

In addition, the hose length (L4) when the elastic hose is not passing water is calculated as follows: L4 = (L2 - L1) / (K - 1)
The length of the non-elastic hose (L3) is calculated as L3 = L1 - L4.
and concatenated as follows.

In addition, when the hose lengths L1, L2, L3, and L4 are preset, it is necessary to determine the extension ratio K of the elastic hose to be used. In this case, the extension ratio (K) of the elastic hose is defined as K = (L2 - L3) / L4.
The stretchable hose having the hose length L4 and this stretch ratio is connected to a non-stretchable hose having the hose length L3 to form the water discharge hose of this embodiment.

In the following, a specific embodiment will be described. In the following specific embodiment, the "fire hydrant device" is a "fire hydrant device for tunnels," the "hose length L1 of the fire hose in a non-water-passing state" is "L1 = 15 m," and the "hose length L2 of the fire hose extended in a water-passing state" is "L2 = 30 m."

[Specific Contents of the Embodiment]
The detailed contents of the fire hydrant equipment will be explained as follows:
a. Fire hydrant device b. Internal structure of a fire hydrant device c. Elastic hose d. Hose length of non-elastic hose and elastic hose e. Specific example 1 of a fire hose
f. Example 2 of a fire hose
g. Specific example 3 of fire hose
h. Divided connection between non-elastic hose and elastic hose i. Modification of the present invention

[a. Fire hydrant equipment]
The fire hydrant device will be described in more detail. As shown in FIG. 1, the fire hydrant device 10 is divided into a hydrant side housing 10a and a fire extinguisher side housing 10b, and decorative frames 11a and 11b are attached to the front of the housings 10a and 10b, and the device is installed on a stand 15. In the description of FIG. 1, the X-Y-Z directions are mutually perpendicular directions, and specifically, the X direction is the left-right direction, the Y direction is the up-down direction, and the Z direction is the front-back direction (depth direction). In the X direction, +X is the right, -X is the left, and in the Y direction, +Y is the up, and -Y is the down. Furthermore, in the Z direction, +Z is the back (the tunnel wall side or the guard passage side when installed), and -Z is the front (the road side when installed). This point is the same in FIG. 2 to FIG. 4 showing the internal structure of the fire hydrant device 10.

The door opening of the decorative frame 11a on the fire hydrant side is divided into upper and lower parts, with a forward-tilting fire hydrant door (lower door) 12 that opens downwards on hinges 12a located in the lower door opening, and a maintenance door (upper door) 14 that opens upwards on hinges 14a located in the upper door opening, with a hose with a nozzle and valves including a fire hydrant valve stored inside.

A fire extinguisher door 18 that opens sideways to the left on hinges 18a is provided on the left side of the door opening of the decorative frame 11b on the fire extinguisher side, and two fire extinguishers can be stored inside. In addition, a viewing window 19 is provided on the bottom of the fire extinguisher door 18, making it possible to check from outside whether or not a fire extinguisher is stored.

On the right side of the door opening of the decorative frame 11b on the fire extinguisher side, there is an electrical panel 22 with a door structure that opens sideways to the right on a hinge 22a. The electrical panel 22 is provided with a red indicator light 24, a transmitter 25, and a response lamp 26 as electrical equipment, and a telephone jack (not shown) is provided on the inside of the electrical panel 22.

The red indicator light 24 is always lit, allowing the location of the fire hydrant device 10 to be known from a distance. In the event of a fire, when the transmitter 24 is pressed and the push button switch is turned on, a transmission signal is sent to the disaster prevention receiving panel in the monitoring room and a fire alarm is issued. In response, a response signal is sent from the disaster prevention receiving panel, causing the red indicator light 24 to flash and the response lamp 26 to light up.

[b. Internal structure of fire hydrant equipment]
The internal structure of the fire hydrant device will be described in more detail below. As shown in Figures 2 to 4, the inside of the housing 11a which serves as the fire hydrant storage section 16 is divided into a valve storage section 16a and a hose storage section 16b.

A water supply pipe 28 is drawn into the valve storage section 16a from the outside and connected to a water supply hydrant 30. The water supply pipe 28 branches downward, and a fire hydrant valve 32 and an automatic pressure adjustment valve 33 are provided, followed by a fire hose 20. The fire hydrant valve 32 is opened and closed by a fire hydrant valve opening/closing lever 34 provided on the fire hydrant door 12. When the fire hydrant valve opening/closing lever 34 is opened and closed, the fire hydrant valve 32 is remotely opened and closed by a known wire link mechanism. When the fire hydrant valve opening/closing lever 34 is opened and closed, a fire hydrant valve opening/closing detection switch provided on the lever operation box is turned on and off. A pump start switch 42 for use by the fire brigade is provided on the upper right of the water supply hydrant 30.

The hose storage section 16b is provided with a hose storage frame 35, which stores the fire hose 20 connected to the water supply pipe on the lower right side by winding it inward clockwise. A nozzle 38 is attached to the tip of the fire hose 20 that is pulled out through a hose guide 36 and is detachably held by a nozzle holder 40.

The fire hose 20 is a composite hose in which the nozzle 38 side is an elastic hose with a predetermined set length L4, and the base side of the hose connected to the water supply pipe from the valve storage section 16b on the opposite side to the nozzle 38 is a non-elastic hose, for example a shape-retaining hose, with the two connected together. In this embodiment, the hose length of the fire hose 20 in a non-water-passing state in which a non-elastic hose and an elastic hose are connected is the first set length L1 = 15 m, which is half the conventional hose length of 30 m.

As a result, as shown in Figures 3 and 4, the depth-wise width W1 of the hose storage section 16b that stores the fire hose 20 of this embodiment can be reduced to approximately half the depth-wise width W2 of the hose storage section of a conventional fire hydrant device 100 that stores a fire hose with a hose length of 30 m, and the fire hydrant device 10 is significantly made thinner. Here, as shown in Figure 3, two fire extinguishers 39 are stored inside the housing 10b of the fire hydrant device 10 (inside the fire extinguisher door 18), and the depth-wise width W1 of the fire hydrant device 10 must be at least wide enough to store the fire extinguishers 39, and based on this, the depth-wise width W1 of the hose storage section 16b can be reduced to approximately 15 cm.

[c. Elastic hose]
A more detailed description will be given of the expandable hose that is the nozzle side of the fire hose 20. The expandable hose is contracted to a predetermined set length in a non-water-passing state and expands in the longitudinal direction in a water-passing state, and the hose structure is arbitrary, but for example, it has a two-layer structure with a watertight layer provided on the water-passing surface that comes into direct contact with water and a cover layer provided on the outside of the watertight layer.

The watertight layer is made of a material that is stretchable with a specified elongation ratio K and impermeable to water. The material that forms the watertight layer is synthetic rubber or a specified synthetic resin with a specified elongation ratio K that stretches at least 1.5 to 8 times when 1 MPa of fire water flows through it, assuming that the length in an unloaded state is 1. Taking a tunnel fire hydrant device as an example, the material that forms the watertight layer is made of synthetic rubber or a specified synthetic resin with a specified elongation ratio K that stretches at least 1.5 to 8 times when 1 MPa of fire water flows through it.

The cover layer is attached to the outside of the watertight layer by being pasted or adhered to it, and is made of a material that is flexible with an elongation rate equal to or less than that of the watertight layer, and has the strength to withstand the water pressure associated with the passage of 1 MPa of fire water. In addition, the cover layer is made of a material that has low friction and abrasion resistance to withstand rubbing, since it rubs against the road surface when the fire hose 10 is pulled out as a tunnel fire hydrant.

The material forming the cover layer is a specified fiber or a specified synthetic resin that has an elongation ratio K of 1.5 to 8 times or less when water passes through. When fibers are used for the cover layer, the knitted structure is made of warp threads and weft threads that have an elongation ratio K of 1.5 to 8 times or less when water passes through, and the weft threads are spiral. As the fiber that constitutes the knitted cover layer, for example, synthetic spider silk can be used. As such synthetic spider silk, the product name "Spiver (registered trademark)" manufactured by Spiber Co., Ltd. can be used.

[d. Hose length of non-elastic hose and elastic hose]
The hose lengths of the non-elastic hose and the elastic hose constituting the fire hose 20 of this embodiment will be described in more detail.

Figure 5 (A) shows the fire hose 20 in a non-water-passing state pulled out linearly from the hose storage section 16b of the fire hydrant device 10, and Figure 5 (B) shows the fire hose 20 in an extended state with water passing through it.

As shown in FIG. 5(A), the fire hose 20 in a non-water-passing state is made by connecting a non-elastic hose 46 and an elastic hose 48. If the hose length of the fire hose 20 in a non-water-passing state is the first set length L1, and as shown in FIG. 5(B), the hose length of the fire hose 20 in a water-passing state is the second set length L2, and the extension ratio of the elastic hose 48 is a predetermined set ratio K, then the hose length L3 of the non-elastic hose 46 and the hose length L4 of the elastic hose 48 in a non-water-passing state are calculated and connected based on the first and second set lengths L1 and L2 and the set ratio K.

Here, between the hose lengths (L1, L2, L3, L4), L1 = L3 + L4
L2=l3+K・L4
Since the above relationship exists, when the hose lengths L1, l2 and the extension ratio K are constants and the hose length L3 of the non-elastic hose 46 is a variable, L3=(L2-K·L1)/(1-K) (Equation 1) is solved.
The hose length L4 of the elastic hose 48 in a non-water-passing state can be calculated as follows: L4 = L1 - L3
It is calculated as:

Furthermore, when the hose length L4 of the elastic hose 48 in a non-water-passing state is used as a variable, L4=(L2-L1)/(K-1) (Equation 2) is obtained.
The hose length L3 of the non-elastic hose can be calculated as follows: L3 = L1 - L4
It is calculated as:

Another procedure for setting the fire hose 20 in which the non-elastic hose 46 and the elastic hose 48 are connected is to preset the set lengths L1, L2, L3, and L4 of each hose as constants, determine the extension ratio K of the elastic hose 48 that satisfies the set hose lengths as a variable, and select the elastic hose 48 with the determined extension ratio K. In this case, the extension ratio K of the elastic hose 48 is given by K=(L2-L3)/L4 (Equation 3).
It can be calculated as:

[e. Specific example 1 of fire hose]
Fig. 6 shows a specific example of a fire hose 20 using an elastic hose 48 with an extension ratio K = 2.5, Fig. 6(A) shows a non-water-passing state, and Fig. 6(B) shows a water-passing state. Here, the first set length L1 of the fire hose 20 in the non-water-passing state is 15 m, the second set length L2 extended in the water-passing state is 30 m, and the extension ratio K is a constant of 2.5.

In this case, the third set length L3 of the non-elastic hose 46 is calculated from the above (Equation 1) as follows: L3=(L2-K·L1)/(1-K)
=(30-2.5×15)/(1-2.5)
= 5m
The fourth set length L4 of the elastic hose 48 is L4=L1-L3=15-5=10 m.
That is, in a non-water-passing state, the ratio of the hose length of the non-elastic hose 46 to the elastic hose 48 is (1:2).

On the other hand, from the above (Equation 2), the fourth set length L4 of the elastic hose 48 is given by L4=(L2-L1)/(K-1).
=(30-15)/(2.5-1)
= 10m
The third set length L3 of the non-elastic hose 46 is calculated as L3 = L1 - L4 = 15 - 10 = 5 m.
It may be calculated as:

The first to fourth set values L1, L2, L3, and L4 of each hose are set as follows: L1 = 15 m
L2 = 30 m
L3 = 5m
L4 = 10 m
In the case where the extension ratio K of the elastic hose 48 is preset as a constant, the extension ratio K of the elastic hose 48, which is a variable, is calculated based on the above (Equation 3) as follows: K = (L2 - L3) / L4
=(30-5)/10
= 2.5
Then, an elastic hose having an elongation ratio K=2.5 is selected to manufacture the fire hose 20.

[f. Specific example 2 of fire hose]
FIG. 7 shows another specific example of the fire hose 20 using an elastic hose 48 with an extension ratio K=3.0, in which FIG. 7(A) shows a non-water-passing state and FIG. 7(B) shows a water-passing state.

Here, L1 = 15 m, L2 = 30 m, and K = 3.0. Therefore, the third set length (L3) of the non-elastic hose 46 is calculated from the above (Equation 1) as follows: L3 = (L2 - K L1) / (1 - K)
=(30-3.0×15)/(1-3.0)
= 7.5m
Therefore, the fourth set length L4 of the elastic hose 48 is L4=L1-L3=15-7.5=7.5 m.
That is, in a non-water-passing state, the ratio of the hose length of the non-elastic hose 46 to the elastic hose 48 is (1:1).

On the other hand, from the above (Equation 2), the fourth set length L4 of the elastic hose 48 is given by L4=(L2-L1)/(K-1).
=(30-15)/(3.0-1)
= 7.5m
The third set length L3 of the non-elastic hose 46 is calculated as L3=L1-L4=15-7.5=7.5 m.
It may be calculated as:

The first to fourth set values L1, L2, L3, and L4 of each hose are set as follows: L1 = 15 m
L2 = 30 m
L3 = 7.5 m
L4 = 7.5 m
In the case where the extension ratio K of the elastic hose 48 is preset as a constant, the extension ratio K of the elastic hose 48, which is a variable, is calculated based on the above (Equation 3) as follows: K = (L2 - L3) / L4
=(30-7.5)/7.5
= 3.0
Then, an expandable hose having an extension ratio K=3.0 is selected to manufacture the fire hose 20.

[g. Specific example 3 of fire hose]
FIG. 8 shows another specific example of the fire hose 20 using an elastic hose 48 with an extension ratio K=4.0, in which FIG. 8(A) shows a non-water-passing state and FIG. 8(B) shows a water-passing state.

Here, L1 = 15 m, L2 = 30 m, and K = 4.0. Therefore, the third set length L3 of the non-elastic hose 46 is calculated from the above (Equation 1) as follows: L3 = (L2 - K L1) / (1 - K)
=(30-4.0×15)/(1-4.0)
= 10m
The fourth set length L4 of the elastic hose 48 is L4=L1-L3=15-10=5m.
That is, in a non-water-passing state, the ratio of the hose length of the non-elastic hose 46 to the elastic hose 48 is (2:1).

On the other hand, from the above (Equation 2), the fourth set length L4 of the elastic hose 48 is given by L4=(L2-L1)/(K-1).
=(30-15)/(4.0-1)
= 5m
The third set length L3 of the non-elastic hose 46 is calculated as L3 = L1 - L4 = 15 - 5 = 10 m.
It may be calculated as:

The first to fourth set values L1, L2, L3, and L4 of each hose are set as follows: L1 = 15 m
L2 = 30 m
L3 = 10m
L4 = 5m
In the case where the extension ratio K of the elastic hose 48 is preset as a constant, the extension ratio K of the elastic hose 48, which is a variable, is calculated based on the above (Equation 3) as follows: K = (L2 - L3) / L4
=(30-10)/5
= 4.0
Then, an expandable hose having an extension ratio K=4.0 is selected to manufacture the fire hose 20.

The above specific examples 1 to 3 are just examples, and as necessary, the hose lengths L1, L2 and the elongation ratio K can be set as arbitrary constants to determine the hose lengths L3, L4 that are variables, or the hose lengths L1, L2, L3, L4 can be set as constants to determine the elongation ratio K that is variables.

[h. Dividable connection of non-elastic hose and elastic hose]
A fire hose in which either a non-elastic hose or an elastic hose is divided and connected to the other will be described in more detail. Such a fire hose is one form of a fire hose in which one part is an elastic hose and the remaining part is a non-elastic hose.

Figure 9 shows an embodiment of a fire hydrant device that uses a fire hose in which an elastic hose is divided and connected to a non-elastic hose, with Figure 9 (A) showing the non-water-passing state and Figure 9 (B) showing the water-passing state.

Here, the first set length L1 of the fire hose 20 in a non-water-passing state is 15 m, the second set length L2 extended in a water-passing state is 30 m, and the extension ratio K of the elastic hose 48 is a constant of 2.5. The hose length of the non-elastic hose 48 is, for example, 5 m, and elastic hoses 48a and 48b, each divided into 5 m, are connected to both sides of the non-elastic hose 48. The hose end of the elastic hose 48a is connected to the water supply pipe of the hose storage section 16b of the fire hydrant device 10, and a nozzle 38 is attached to the tip of the elastic hose 48b.

When water is passed through a fire hose 20 having elastic hoses 48a, 48b connected to both sides of such a non-elastic hose 46, as shown in FIG. 9(B), the elastic hoses 48a, 48b each expand to 12.5 m corresponding to an expansion ratio K = 2.5, and water is discharged from the nozzle 38 with the overall hose length L2 expanded to 30 m.

When the elastic hose 48a is connected to a water supply pipe and stored in the hose storage section 16b, the elastic hose 48a stretches while water is flowing, causing the base of the hose to be pressed strongly against the inside of the hose storage section 16b, which may increase the pulling force at this point. However, the elastic hose 48b stretches, pushing the nozzle 38 side out of the hose storage section 16b, allowing at least the non-elastic hose 46 to be smoothly pulled out.

Figure 10 shows another embodiment of a fire hydrant device that uses a fire hose in which a non-stretchable hose is divided and connected to a stretchable hose. Figure 10 (A) shows the non-water-passing state, and Figure 10 (B) shows the water-passing state.

Here, the first set length L1 of the fire hose 20 in a non-water-passing state is 15 m, the second set length L2 extended in a water-passing state is 30 m, and the extension ratio K of the elastic hose 48 is a constant of 4.0. The elastic hose 48 has a hose length of, for example, 5 m, and non-elastic hoses 46a and 46b, each divided into 5 m, are connected to both sides of the elastic hose 48. The hose end of the non-elastic hose 46a is connected to the water supply pipe of the hose storage section 16b of the fire hydrant device 10, and a nozzle 38 is attached to the tip of the non-elastic hose 46b.

When water is passed through the fire hose 20, which has non-elastic hoses 46a and 46b connected to both sides of the elastic hose 48, the elastic hose 48 expands to 20 m corresponding to an expansion ratio K of 4.0, as shown in FIG. 10(B), and water is discharged from the nozzle 38 with the overall hose length L2 expanded to 30 m.

Figures 9 and 10 show an example of a fire hose in which either a non-stretchy hose or a stretchy hose is split and connected to the other, but are not limited to this and include fire hoses in which the ratio of the hose lengths of the two hoses and the extension ratio of the stretchy hose are arbitrarily determined as necessary. Also, in addition to splitting either a non-stretchy hose or a stretchy hose, it includes fire hoses in which both are split and alternately connected.

[i. Modifications of the present invention]
Modifications of the in-vehicle information display device according to the present invention will be described in more detail. In addition to the above-described embodiment, the fire hydrant device of the present invention includes the following modifications.

(Fire hydrant equipment)
The above embodiment takes a fire hydrant device for a tunnel as an example, but is not limited to this and may include any other device, such as an indoor fire hydrant housing a hose with a nozzle, an outdoor fire hydrant, a hose storage box, a fire pump truck, etc.

(others)
Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values shown in the above embodiment.

10: Fire hydrant device 10a, 10b: Housing 11a, 11b: Decorative frame 12: Fire hydrant door 14: Maintenance door 15: Stand 16: Fire hydrant storage section 16a: Valve storage section 16b: Hose storage section 18: Fire extinguisher door 20: Fire hose 22: Electrical panel 24: Red indicator light 25: Transmitter 26: Response lamp 28: Water supply pipe 30: Water supply hydrant 32: Fire hydrant valve 33: Automatic pressure adjustment valve 34: Fire hydrant valve opening/closing lever 35: Hose storage frame 36: Hose guide 38: Nozzle 39: Fire extinguisher 40: Nozzle holder 42: Pump start switch 46, 46a, 46b: Non-elastic hose 48, 48a, 48b: Elastic hose

Claims (7)

A fire hydrant device in which a fire hose with a nozzle attached to the tip is freely pulled out and stored in a housing,
The fire hose is characterized in that a portion of the fire hose is an elastic hose and the remaining portion is a non-elastic hose.
The fire hydrant device according to claim 1,
The fire hose is characterized in that a predetermined length on the nozzle side is the elastic hose, and the remaining predetermined length on the opposite side to the nozzle is the non-elastic hose.
The fire hydrant device according to claim 2,
The hose length of the fire hose in a non-water-passing state is set as a first set length (L1),
The hose length of the fire hose in a water-passing state is set to a second set length (L2) that is longer than the first set length (L1),
When the extension ratio of the elastic hose is set to a predetermined set ratio (K),
A fire hydrant device characterized in that a hose length (L3) of the non-elastic hose and a hose length (L4) of the elastic hose in a non-water-passing state are calculated and connected based on the first and second set lengths (L1, L2) and the set magnification (K).
The fire hydrant device according to claim 3,
The hose length (L3) of the non-elastic hose is L3 = (L2 - K L1) / (1 - K)
The hose length (L4) of the elastic hose in a non-water-passing state is calculated as L4 = L1 - L3.
A fire hydrant device characterized in that the fire hydrant is connected as follows.
The fire hydrant device according to claim 3,
The hose length (L4) of the elastic hose in a non-water-passing state is calculated as follows: L4 = (L2 - L1) / (K - 1)
The hose length (L3) of the non-elastic hose is calculated as follows: L3 = L1 - L4
A fire hydrant device characterized in that the fire hydrant is connected as follows.
The fire hydrant device according to claim 2,
The hose length of the fire hose in a non-water-passing state is set as a first set length (L1),
The hose length of the fire hose in a water-passing state is set to a second set length (L2) that is longer than the first set length (L1),
The hose length of the non-elastic hose is a third predetermined length (L3),
When the hose length of the elastic hose in a non-water-passing state is set to a fourth set length (L4) obtained by subtracting the third predetermined length (L3) from the first set length (L1),
A fire hydrant device, characterized in that an extension ratio (K) of the expandable hose is calculated based on the second to fourth set lengths.
The fire hydrant device according to claim 6,
The extension ratio (K) of the elastic hose is K = (L2 - L3) / L4.
A fire hydrant device characterized by:

Images