Fire hydrant system

Abstract

To enable a spot situation in which a road user pulls out a fire hose and performs fire extinguishing to be appropriately grasped on a disaster prevention receiving board side.SOLUTION: A fire hydrant device is equipped with a hose length detection part for optically detecting a pull-out length of a fire hose 58 from a hose storage part, and transmitting it to a disaster prevention receiving board. The hose length detection part optically reads markers 74 displayed on the fire hose 58 at predetermined intervals by a reading detection part 72 equipped with a light projection part 75 and a light reception part 76, multiplies the number of detected markers 74 by the interval of the markers 74 to detect the pull-out length of the fire hose 58, and transmits it to the disaster prevention receiving board so that it is displayed. It is also possible to detect the hose pull-out length on the basis of the rotation of a roller that comes in contact with the fire hose 58, and reception radio wave strength of a radio wave from a transmission part disposed in a water discharging nozzle.SELECTED DRAWING: Figure 6

Description

【Technical Field】 【0001】 The present invention relates to a fire hydrant device installed in a tunnel that stores a fire hose or the like to which a water discharge nozzle is attached. 【Background Art】 【0002】 Conventionally, fire hydrant devices have been installed in tunnels such as highways and motorways as emergency facilities in the tunnel. The fire hydrant device includes a fire hose with a water discharge nozzle attached to its tip and valves including a fire hydrant valve stored in a fire hydrant storage section of a housing equipped with a fire hydrant door, and, for example, two fire extinguishers are stored in a fire extinguisher storage section equipped with a fire extinguisher door. Also, the fire hydrant device is generally installed by cutting out the tunnel wall surface at intervals of, for example, 50 meters in the longitudinal direction of the tunnel and embedding it. 【0003】 In addition, an emergency reporting device is provided in the fire hydrant device. The emergency reporting device includes a red indicator light, a transmitter, a response lamp, and a telephone jack provided on a reporting device door arranged between the fire hydrant storage section and the fire extinguisher storage section. 【0004】 The red indicator light is always on so that the installation location of the fire hydrant device can be confirmed from a distance. When a fire breaks out and the transmitter is pressed to turn on the push button switch, a fire alarm signal is transmitted to a disaster prevention receiving board installed in an electrical room or the like, and a fire alarm is output. The disaster prevention receiving board that outputs a fire alarm transmits a response signal to the emergency reporting device, causing the red indicator light to blink and the response lamp to light up, enabling confirmation that the fire alarm signal has been received on the disaster prevention receiving board side (Patent Document 1). 【0005】 By the way, when a vehicle fire breaks out due to an accident or the like in a tunnel, road users operate the transmitter to report the fire and then carry out fire extinguishing activities using the fire hydrant device. 【0006】 When road users use a fire hydrant system, opening the fire hydrant door exposes the water discharge nozzle held in a nozzle holder installed on the back side of the fire hydrant door, and also exposes the fire hydrant valve opening / closing lever, which is also installed on the back side of the fire hydrant door, in an operable manner (Patent Documents 1 and 2). 【0007】 Therefore, road users remove the water nozzle from the nozzle holder, then operate the fire hydrant valve lever to the open position, and with water being discharged from the nozzle, pull out the fire hose towards the fire source to extinguish the fire. When the fire hydrant valve lever is operated to the open position, the pump interlocking start switch is turned on, a pump start signal is sent to the disaster prevention receiver panel, and the fire pump equipment is started, supplying a continuous supply of firefighting water to the fire hose. [Prior art documents] [Patent Documents] 【0008】 [Patent Document 1] Japanese Patent Publication No. 2003-310785 [Patent Document 2] Japanese Patent Publication No. 2021-145911 [Overview of the project] [Problems that the invention aims to solve] 【0009】 However, with conventional fire hydrant systems, a fire alarm is issued based on the reception of a fire notification signal from the fire hydrant system via the operation of a transmitter. However, the disaster prevention receiving panel cannot confirm whether road users are subsequently using the fire hydrant system to extinguish the fire. In tunnels where surveillance cameras are not installed, on-site verification by the road administrator is required, which presents a problem of time and effort in confirming the usage status of the fire hydrant system. 【0010】 To solve this problem, it is conceivable to detect the opening of the fire hydrant door and the opening of the fire hydrant valve lever on the fire hydrant system and display this information on the disaster prevention receiver panel. However, even if the use of the fire hydrant system can be confirmed from the display of the opening of the fire hydrant door and the fire hydrant valve lever, it is difficult for the disaster prevention receiver panel to grasp the actual situation on site, such as how the fire hose is being pulled out and how firefighting is being carried out. 【0011】 The present invention aims to provide a fire hydrant system that allows the disaster prevention receiving panel to appropriately grasp the situation at a site where road users are pulling out fire hoses to extinguish fires. [Means for solving the problem] 【0012】 (Fire hydrant system) The present invention relates to a fire hydrant device in which a fire extinguishing hose stored in a hose storage section within the housing is drawn out during firefighting activities. It is characterized by having a hose length detection unit that detects the length of the fire extinguishing hose pulled out from the hose storage unit and transmits the information to the disaster prevention receiving panel. 【0013】 (Optical detection of hose pull-out length) The hose length detection unit is, Markers are displayed on the fire hose at predetermined intervals, A reading and detection unit that optically reads a marker to detect the length of the fire extinguishing hose, It is equipped with. 【0014】 (Calculation of hose pull-out length based on marker detection) The reading detection unit calculates the length of the fire extinguishing hose based on the number of times the optically read markers are read and the interval between marker displays. 【0015】 (The reading detection unit starts operating upon nozzle removal detection.) A water nozzle attached to the end of a fire hose, A nozzle holder that detachably holds the water spray nozzle, A nozzle removal detector that detects the removal of the water discharge nozzle from the nozzle holding part, comprises, when the removal of the water discharge nozzle is detected by the nozzle removal detector, the operation of the reading detection unit is started. 【0016】 (Detection of hose extraction length by roller rotation) The hose length detection unit is arranged on the extraction side of the fire hose, and includes a roller that rotates as the fire hose is extracted, and a rotation detection unit that detects the extraction length of the fire hose based on the rotation of the roller. comprises. 【0017】 (Calculation of hose extraction length based on the connected rotation of rollers arranged on four sides) The rollers are rotatably provided on each side of the hose guide having a rectangular opening, and are connected by a gear mechanism so that all other rollers rotate integrally with the rotation of at least one roller. The rotation detection unit includes a rotation detector that detects the rotation of any one of the plurality of rollers, and calculates the extraction length of the fire hose based on the number of rotations detected by the rotation detector and the circumference of the roller. 【0018】 (Starting the operation of the rotation detection unit by nozzle removal detection) a water discharge nozzle attached to the tip of the fire hose, a nozzle holding unit that removably holds the water discharge nozzle, a nozzle removal detector that detects the removal of the water discharge nozzle from the nozzle holding unit, comprises, when the removal of the water discharge nozzle is detected by the nozzle removal detector, the operation of the rotation detection unit is started. 【0019】 (Detection of hose extraction length by received radio wave intensity) The hose length detection unit is installed on the water discharge nozzle attached to the tip of the fire hose and transmits radio waves in a timely manner, and is installed on the housing side of the fire hydrant device, and a reception detection unit that detects the extraction length of the fire hose based on the received radio wave intensity of the radio wave transmitted from the transmission unit. It is equipped with. 【0020】 (Transmission initiated by nozzle removal) It is equipped with a nozzle holder that detachably holds the water spray nozzle, The transmitting unit has a built-in battery power supply, and when the water spray nozzle is removed from the nozzle holder, the battery power supply is turned on and radio wave transmission begins. 【0021】 (Transmission starts by turning the switch on or off) The transmitting unit is equipped with a switch that turns off when an insulating sheet is interposed in the power supply line of the battery power supply, and turns on when the insulating sheet is removed in conjunction with the removal of the water spray nozzle from the nozzle holding part. 【0022】 (Switching on and off using an insulating sheet) The transmitting unit is equipped with a fixing string that connects one end of the insulating sheet to the housing side of the fire hydrant device, and the switch turns on when the insulating sheet is pulled out from the power supply line by the fixing string in conjunction with the removal of the water discharge nozzle from the nozzle holding part. 【0023】 (The receiver detection unit starts operating upon nozzle removal detection.) A nozzle holder that detachably holds the water spray nozzle, A nozzle removal detector that detects the removal of the water discharge nozzle from the nozzle holding part, Equipped with, The receiving detection unit starts operating when the nozzle removal detector detects that the water discharge nozzle has been removed. [Effects of the Invention] 【0024】 (Effectiveness of fire hydrant systems) The present invention relates to a fire hydrant system in which a fire extinguishing hose stored in a hose storage compartment within the housing is drawn out during firefighting activities. The system includes a hose length detection unit that detects the length of the fire extinguishing hose drawn out from the hose storage compartment and transmits this information to a disaster prevention receiving panel. For example, if the fire hydrant system stores a fire extinguishing hose using a 30-meter shape-retaining hose, the length of the fire extinguishing hose drawn out from the fire hydrant system can be confirmed on the disaster prevention receiving panel side. This makes it possible to understand the situation at the scene, such as how far the fire extinguishing hose has been drawn out and how much water is being discharged at a fire site in a tunnel. Furthermore, the length of the drawn-out fire extinguishing hose can be used to determine whether the fire site is close to or far from the installation location of the fire hydrant system, making it possible to estimate the location of the fire. 【0025】 (Effect of optical detection of hose length) Furthermore, the hose length detection unit includes markers displayed on the fire extinguishing hose at predetermined intervals and a reading detection unit that optically reads the markers to detect the length of the fire extinguishing hose. For example, the reading detection unit calculates the length of the fire extinguishing hose based on the number of times the optically read markers are read and the interval between the markers. By placing markers, such as black or white stripes, at predetermined intervals, for example, 0.5-meter intervals, on the fire extinguishing hose, the length of the fire extinguishing hose can be easily and simply detected and displayed on the disaster prevention receiver panel by multiplying the number of times the optically read markers are read by the interval between the markers. 【0026】 (Effect of starting the operation of the reading detection unit upon nozzle removal detection) Furthermore, the system includes a water discharge nozzle attached to the end of the fire hose, a nozzle holder that detachably holds the water discharge nozzle, and a nozzle removal detector that detects when the water discharge nozzle is removed from the nozzle holder. The reading detection unit starts operating when the removal of the water discharge nozzle is detected by the nozzle removal detector. Therefore, the reading detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and is inactive during operation (when no firefighting activity is taking place), thus saving power consumption. 【0027】 (Effect of detecting the length of the pull-out hose by roller rotation) Furthermore, the hose length detection unit is located on the withdrawal side of the fire extinguishing hose and comprises a roller that rotates as the fire extinguishing hose is withdrawn, and a rotation detection unit that detects the length of the fire extinguishing hose withdrawn based on the rotation of the roller. For example, the rollers are rotatably mounted on each side of a hose guide having a rectangular opening, and are connected by a gear mechanism such that all the other rollers rotate together as at least one roller rotates. The rotation detection unit comprises a rotation detector that detects the rotation of any of the multiple rollers, and is based on the number of rotations detected by the rotation detector and the circumference of the roller. To calculate the length of the fire extinguishing hose that is pulled out, when the fire extinguishing hose is pulled out through the hose guide, the roller that the fire extinguishing hose is in contact with among the rollers provided on each of the four sides of the rectangular opening that makes up the hose guide rotates, and all other rollers connected by a gear mechanism, such as a bevel gear mechanism arranged orthogonally, also rotate simultaneously. The rotation speed of a predetermined roller is detected by a rotation detector, and by multiplying that rotation speed by the circumference (outer length) of the roller, the length of the fire extinguishing hose that is pulled out can be easily and simply calculated and displayed on the disaster prevention receiver panel. 【0028】 (Effect of starting the rotation detection unit's operation upon nozzle removal detection) Furthermore, the system includes a water discharge nozzle attached to the end of the fire hose, a nozzle holder that detachably holds the water discharge nozzle, and a nozzle removal detector that detects when the water discharge nozzle is removed from the nozzle holder. When the nozzle removal detector detects that the water discharge nozzle has been removed, the rotation detection unit starts operating. Therefore, the rotation detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and its operation is stopped during operation, thus saving power consumption. 【0029】 (Effect of detecting hose length based on radio wave reception strength) Furthermore, the hose length detection unit includes a transmitting unit installed on the water discharge nozzle attached to the end of the fire extinguishing hose, which transmits radio waves in a timely manner, and a receiving detection unit installed on the housing side of the fire hydrant device, which detects the length of the fire extinguishing hose pulled out based on the received radio wave intensity of the radio waves transmitted from the transmitting unit. Since the radio waves from the transmitting unit attenuate inversely proportional to the square of the distance, for example, the radio wave propagation distance calculated as the square root of the reciprocal of the received radio wave intensity can be detected as the length of the fire extinguishing hose pulled out, or, by pre-determining and setting the relationship between the length of the hose pulled out and the received radio wave intensity when a 30-meter fire extinguishing hose is pulled out by removing the water discharge nozzle, the length of the fire extinguishing hose pulled out from the hose storage section can be detected from the received radio wave intensity of the radio waves transmitted from the transmitting unit when the fire extinguishing hose is pulled out, and this can be displayed on the disaster prevention receiver panel. 【0030】 (Effect of initiating transmission by removing the nozzle) Furthermore, the device is equipped with a nozzle holder that detachably holds the water spray nozzle, and the transmitter unit has a built-in battery power supply. When the water spray nozzle is removed from the nozzle holder unit, the battery power is switched on and radio wave transmission begins. For this reason, the transmitter unit is equipped with a switch that turns off when an insulating sheet is interposed in the power supply line of the battery power supply unit. When the insulating sheet is removed in conjunction with the removal of the water spray nozzle from the nozzle holder unit, the switch turns on. Therefore, even when the receiver unit uses battery power, the switch remains off during normal operation due to the presence of the insulating sheet, preventing the battery power from being depleted during operation and enabling, for example, a battery life of more than 10 years. 【0031】 (The effect of using an insulating sheet to turn the switch on and off) Furthermore, the transmitting unit is equipped with a fixing string that connects one end of the insulating sheet to the housing side of the fire hydrant device. When the insulating sheet is pulled out from the power supply line by the fixing string in conjunction with the removal of the water discharge nozzle from the nozzle holder, the switch turns on. Therefore, when the water discharge nozzle is removed from the nozzle holder, the insulating sheet is pulled out from the power supply line of the transmitting unit by the fixing string tied to the housing side of the fire hydrant device, and the battery power supply is turned on, making it possible to easily and reliably start measuring the length of the fire hose that has been pulled out. 【0032】 (Effect of the receiver detection unit starting operation upon nozzle removal detection) Furthermore, the system includes a nozzle holder that detachably holds the water discharge nozzle and a nozzle removal detector that detects when the water discharge nozzle is removed from the nozzle holder. The receiver detection unit starts operating when the nozzle removal detector detects that the water discharge nozzle has been removed. Therefore, the receiver detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and is inactive during operation, thus saving power consumption. [Brief explanation of the drawing] 【0033】 [Figure 1] This is an explanatory diagram showing an overview of tunnel emergency equipment. [Figure 2] This is an explanatory diagram showing a fire hydrant system from the front. [Figure 3] This is an explanatory diagram showing the internal structure of the fire hydrant system from the front, with each door open. [Figure 4] This is an explanatory diagram showing the internal structure of a fire hydrant system in a cross-sectional view from a plan view, with the fire hydrant door in the open position. [Figure 5] This is an explanatory diagram showing the internal structure of a fire hydrant system in a cross-sectional view from the side, with the fire hydrant door in the open position. [Figure 6] This is an explanatory diagram showing a first embodiment of a hose length detection unit in which a reading detection unit is provided on a hose guide located on the back surface of a fire hydrant door. [Figure 7]This is an explanatory diagram showing the configuration of a terminal control device corresponding to the first embodiment of the hose length detection unit. [Figure 8] This is an explanatory diagram showing a cross-sectional view from the side of a fire hydrant device equipped with a second embodiment of a hose length detection unit that detects the hose length by the rotation of a roller. [Figure 9] This is an explanatory diagram showing a second embodiment of the hose length detection unit shown in Figure 8. [Figure 10] This is an explanatory diagram showing the structure of the rotation detection unit provided on the hose guide of the second embodiment of the hose length detection unit. [Figure 11] This is an explanatory diagram showing the configuration of a terminal control device corresponding to the second embodiment of the hose length detection unit. [Figure 12] This is an explanatory diagram showing a cross-sectional view from a plan view of a fire hydrant system equipped with a third embodiment of a hose length detection unit that detects the hose length based on the received radio wave intensity. [Figure 13] This is an explanatory diagram showing the configuration of a terminal control device corresponding to the third embodiment of the hose length detection unit. [Figure 14] This is an explanatory diagram showing the relationship between the length of the extended hose (which represents the radio wave propagation distance) and the received radio wave intensity. [Modes for carrying out the invention] 【0034】 Embodiments of the fire hydrant device according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. 【0035】 [Basic Concepts of the Embodiment] First, the basic concept of the embodiment will be explained. The embodiment generally relates to a fire hydrant system in which a fire extinguishing hose stored in a hose storage section inside the housing is drawn out during firefighting activities. 【0036】 Here, "fire hydrant system" refers to a type of emergency equipment installed in areas that are subject to fire extinguishing, such as tunnels on expressways and motorways. It contains or houses fire hydrant equipment such as fire hoses, and may also include emergency notification devices such as red indicator lights and transmitters, or fire extinguishers. 【0037】 Furthermore, "fire hydrant equipment" includes a fire hose that is retractable and stored inside, with a water discharge nozzle attached to its tip; a nozzle holder that detachably holds the water discharge nozzle; valves including a fire hydrant valve; and a fire hydrant valve opening / closing operation unit that operates the opening and closing of the fire hydrant valve. 【0038】 The "fire hydrant device" of the embodiment is characterized by being equipped with a hose length detection unit that detects the length of the fire hose pulled out from the hose storage unit and transmits it to the disaster prevention receiving panel. 【0039】 Here, "extended length of fire hose" refers to the length of the fire hose that is pulled out when a road user opens the fire hydrant door of a fire hydrant system to use a fire hydrant, and the water nozzle attached to the end of the hose, for example, a 30-meter fire hose that is stored coiled up inside the hose storage compartment of the housing, is removed from the nozzle holder and pulled out to the outside. This includes not only the length in meters but also concepts indicating the percentage of the hose that has been pulled out relative to the total length, such as 1 / 3 pulled out or 1 / 2 pulled out. Note that the state in which the hose is pulled out is sometimes referred to as "hose pulled out." 【0040】 Therefore, the fire prevention receiving panel can check the length of the fire hose pulled out from the fire hydrant system, making it possible to understand the situation at the scene of a fire in a tunnel, such as how far the fire hose has been pulled out and how much water is being discharged. In addition, from the length of the pulled-out fire hose, the fire prevention receiving panel can determine whether the fire is near or far from the fire hydrant system, making it possible to estimate the location of the fire. 【0041】 The "hose length detection unit" of the embodiment includes "optical detection of hose extension length" as the first embodiment, "detection of hose extension length by roller rotation" as the second embodiment, and "detection of hose extension length by radio wave reception strength" as the third embodiment. 【0042】 In the first embodiment, the "optical detection of hose extension length" includes a "hose length detection unit" which comprises markers displayed on the fire extinguishing hose at predetermined intervals and a reading detection unit which optically reads the markers to detect the extension length of the fire extinguishing hose. 【0043】 Here, "marker" refers to a mark, such as a black or white band, placed on a fire hose at predetermined intervals, for example, 0.5-meter intervals, to indicate its position. The "reading detection unit" consists of a light-emitting unit that illuminates the area where the fire hose is pulled out, for example, the fire hose passing through a hose guide with a rectangular opening, and a light-receiving unit that receives the reflected light from the markers on the fire hose and converts it into an electrical signal. The unit detects the number of marker readings from the light-receiving signal corresponding to the amount of fire hose that has been pulled out, and detects the length of the fire hose pulled out by multiplying the number of marker readings by the marker display interval. This allows for the simple and easy detection of the length of the fire hose pulled out and its display on the disaster prevention receiver panel. 【0044】 Furthermore, a nozzle removal detector is provided to detect when the water discharge nozzle attached to the end of the fire hose is removed from the nozzle holder. When the nozzle removal detector detects that the water discharge nozzle has been removed, the reading detection unit starts operating. Therefore, the reading detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and its operation is stopped during normal operation, thus saving power consumption. Note that "removal of the water discharge nozzle" refers to the state in which the water discharge nozzle has been removed from the nozzle holder. 【0045】 In the second embodiment, the "detection of hose extension length by roller rotation" includes a "hose length detection unit" positioned on the extension side of the fire extinguishing hose, comprising a roller that rotates as the fire extinguishing hose is extended, and a rotation detection unit that detects the extension length of the fire extinguishing hose based on the rotation of the roller. 【0046】 When a fire hose, which is coiled inside the hose storage section of a fire hydrant system, is pulled out to the outside through a hose guide having a rectangular opening, it is known that, depending on the speed at which it is pulled out, the pulled-out fire hose moves in a spiral motion as it passes through the hose guide, and comes into contact with the inner circumference of the hose guide as it is pulled out. 【0047】 Therefore, the rollers are rotatably mounted on each side of a hose guide having a rectangular opening on the back of the fire hydrant door, and are connected by a rotation transmission mechanism, such as a gear mechanism, so that when at least one roller rotates, all the other rollers rotate simultaneously in conjunction. 【0048】 Here, the "gear mechanism" refers to a bevel gear mechanism located at the intersection of four rollers arranged perpendicularly to each other in a rectangle. When one of the four rollers rotates upon contact with the extended fire hose, the remaining three rollers rotate simultaneously in conjunction via the bevel gear mechanism. 【0049】 Furthermore, when the fire hose is pulled out through the inner corners of the four rollers arranged perpendicular to each other in a rectangle, it comes into contact with two rollers and rotates simultaneously, causing the remaining two rollers to rotate in conjunction. In other words, regardless of which roller the fire hose comes into contact with and rotates, all four rollers arranged perpendicular to each other in a rectangle rotate simultaneously in the direction that pushes the fire hose out. 【0050】 Therefore, the rotation detection unit is equipped with a rotation detector that detects the rotation of any of the multiple rollers. Based on the rotation speed of the roller detected by the rotation detector and the circumference of the roller, it calculates the length of the fire extinguishing hose that can be pulled out. This allows for easy and reliable detection of the length of the fire extinguishing hose and display on the disaster prevention receiver panel. 【0051】 Furthermore, a nozzle removal detector is provided to detect when the water discharge nozzle attached to the end of the fire hose is removed from the nozzle holder. When the nozzle removal detector detects that the water discharge nozzle has been removed, the rotation detection unit starts operating. Therefore, the reading detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and its operation is stopped during normal operation, thus saving power consumption. 【0052】 In the third embodiment, the "Hose Length Detection Based on Received Radio Wave Strength" includes a "Hose Length Detection Unit" which is installed on a water discharge nozzle attached to the tip of a fire extinguishing hose and transmits radio waves in a timely manner, and a "Receiving Detection Unit" which is installed on the housing side of the fire hydrant device and detects the length of the fire extinguishing hose based on the received radio wave strength of the radio waves transmitted from the transmitting unit. 【0053】 In this case, since the radio waves transmitted from the transmitter attenuate inversely proportional to the square of the distance, for example, the radio wave propagation distance calculated as the square root of the reciprocal of the received radio wave intensity can be detected as the length of the fire hose pulled out. Alternatively, by pre-determining and setting the relationship between the length of the hose pulled out and the received radio wave intensity when a 30-meter fire hose is pulled out by removing the water discharge nozzle equipped with a transmitter from the nozzle holder, the length of the fire hose pulled out from the hose storage section can be detected from the strength of the radio waves transmitted from the transmitter when the fire hose is pulled out, and this can be displayed on the disaster prevention receiver panel. 【0054】 Here, the "transmitter" is a unit that has a built-in battery power supply and starts transmitting radio waves when the water spray nozzle is removed from the nozzle holder by turning on the battery power supply. Its configuration is arbitrary, but the "transmitter" is equipped with a switch that turns off when an insulating sheet is interposed in the power supply line of the battery power supply, and the switch turns on when the insulating sheet is removed in conjunction with the removal of the water spray nozzle from the nozzle holder. More specifically, the transmitter is equipped with a fixing string that connects one end of the insulating sheet to the housing side, and the switch is reliably turned on when the insulating sheet is removed from the power supply line by the fixing string in conjunction with the removal of the water spray nozzle from the nozzle holder. 【0055】 Therefore, even if the transmitter uses battery power, the switch remains off during normal operation due to the presence of an insulating sheet, preventing battery power consumption during operation and enabling, for example, a battery life of more than 10 years. 【0056】 Furthermore, the system is equipped with a nozzle removal detector that detects when the water discharge nozzle attached to the end of the fire hose is removed from the nozzle holder. When the nozzle removal detector detects that the water discharge nozzle has been removed, the receiving detection unit starts operating. Therefore, the reading detection unit starts operating only when a road user removes the water discharge nozzle to pull out the fire hose, and its operation is stopped during normal operation, thus saving power consumption. 【0057】 The following describes specific embodiments. The embodiments describe the "hose length detection unit" in three separate embodiments. The embodiments also describe the case in which the fire extinguishing hose, which is stored in the hose storage unit in an inward-curved manner, is pulled out to the outside through a "rectangular hose guide located on the back side of the fire hydrant door", the "nozzle holding unit" is a "nozzle holder installed on the back side of the fire hydrant door", and the "nozzle removal detection unit" is a "nozzle removal detection switch provided on the nozzle holder". 【0058】 [Specific details of the embodiment] The fire hydrant system of this embodiment will be described in detail as follows: a. Fire hydrant system a1. Overview of tunnel emergency equipment a2. Structure of a fire hydrant system a3. Internal structure of a fire hydrant system b. First embodiment of the hose length detection unit b1. Overview of the hose length detection unit b2. Structure of the reading and detection unit c. Second embodiment of the hose length detection unit c1. Overview of the hose length detection unit c2. Structure of the rotation detection unit d. Third embodiment of the hose length detection unit d1. Transmission section d2. Receiver and terminal control unit d3. Detection of hose pull-out length d4. Detection of hose exit direction e. Modifications of the present invention 【0059】 [a. Fire hydrant system] The fire hydrant system of this embodiment will be described in more detail. In this description, refer to Figure 1, which shows an overview of the tunnel emergency equipment equipped with the fire hydrant system; Figure 2, which shows the fire hydrant system; and Figure 3, which shows the internal structure of the fire hydrant system from the front with the door open. 【0060】 In the explanation of Figures 2 to 3, the X, Y, and Z directions are mutually orthogonal. Specifically, when viewing the front of the fire hydrant device with various doors, 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. Furthermore, in the X direction, the +X side is the right side and the -X side is the left side; in the Y direction, the +Y side is the upper side and the -Y side is the lower side; and in the Z direction, the +Z side is the front side and the -Z side is the rear side. This is also the case in Figures 4 to 6, Figures 8 to 10, and Figure 12. 【0061】 (a1. Overview of tunnel emergency equipment) This section describes the general layout of the tunnel emergency equipment. As shown in Figure 1, the tunnel emergency equipment consists of wiring cables 14 extending longitudinally from a disaster prevention receiving panel 12 installed in the tunnel's electrical room or other location. These cables connect to fire hydrant devices 10 embedded in the tunnel wall of the monitoring staff passage along one side of the road, at intervals of, for example, 50 meters. In addition, fire detectors are installed in the tunnel at intervals of, for example, 50 meters, similar to the fire hydrant devices 10, but their depiction is omitted. 【0062】 The wiring cable 14 includes high-voltage wiring cables for commercial AC power and low-voltage wiring cables for a predetermined DC voltage power supply, and the low-voltage wiring cables include those composed of one or more signal lines and a common line. 【0063】 There are two types of signal transmission between the disaster prevention receiving panel 12 and terminal equipment: "R-type (Recorded type) transmission," which involves setting a unique address for each terminal device, including the fire hydrant device 10 and fire detectors, to send and receive signals; and "P-type (Proprietary-type) transmission," which involves connecting terminal devices on a line-by-line basis to send and receive signals. This embodiment uses R-type transmission as an example. 【0064】 Although not shown in the diagram, other emergency tunnel equipment includes fire pumps, IG substations (intelligent substations), ventilation equipment, alarm display boards, radio rebroadcasting equipment, television monitoring equipment, and lighting equipment, all of which are connected to the disaster prevention receiving panel 12 and exchange signals with each other. 【0065】 Here, the IG substation equipment is communication equipment that connects the equipment installed inside the tunnel, including the disaster prevention receiving panel 12, with the remote management equipment installed far outside the tunnel. The ventilation equipment is equipment that energizes the air inside the tunnel by operating jet fans installed on the ceiling side of the tunnel, creating a ventilation flow in the longitudinal direction of the tunnel. The alarm display board equipment is equipment that displays abnormalities inside the tunnel on an electronic display board to inform road users inside and outside the tunnel. The radio rebroadcasting equipment is equipment that allows road users and others inside the tunnel to receive information from the road administrator. The television monitoring equipment is equipment that allows the road administrator to check the scale and location of a fire, operate water spray equipment, and understand the situation inside the tunnel when guiding evacuations. The lighting equipment is equipment that drives the lighting fixtures inside the tunnel. 【0066】 (a2. Structure of fire hydrant system) Next, the structure of the fire hydrant system will be described. As shown in Figure 2, the fire hydrant system 10 has a structure divided into a housing 10a which houses the fire hydrant and a housing 10b which houses the fire extinguisher, and decorative frames 11a and 11b are attached to the front of the housings 10a and 10b. 【0067】 The door opening of the decorative frame 11a of the housing 10a is divided into upper and lower sections. A forward-tilting fire hydrant door 16 that opens downward by hinge 16a is provided on the lower side of the door opening, and a maintenance door 18 that opens upward by hinge 18a is provided on the upper side of the door opening. Inside the fire hydrant storage section, fire hydrant equipment including a fire hose and valves including a fire hydrant valve is stored. The fire hydrant door 16 is provided with a door handle 1610, and road users can open the fire hydrant door 16 by inserting their hand into the door handle 1610 and pulling it towards them, which releases the lock. 【0068】 On the left side of the door opening of the decorative frame 11b of the housing 10b, a fire extinguisher door 22 is provided, which opens horizontally to the left by a hinge 22a, and the fire extinguisher storage area inside can accommodate, for example, two fire extinguishers. The fire extinguisher door 22 is equipped with a door handle 2210, and road users can open the fire extinguisher door 22 by inserting their hand into the door handle 2210 and pulling it towards them, thereby releasing the lock. In addition, a viewing window 2220 is provided on the lower side of the fire extinguisher door 22, allowing the presence or absence of fire extinguishers to be checked from the outside. 【0069】 An electrical access door 24 is provided on the right side of the door opening of the decorative frame 11b, which opens horizontally to the right by a hinge 24a. On the front side of the electrical access door 24, electrical equipment such as a red indicator light 26, a transmitter 28, and a response lamp 30 are provided, and a telephone jack is provided inside the housing 10b on the back side of the electrical access door 24. Thus, the red indicator light 26, transmitter 28, response lamp 30 provided on the front and back of the electrical access door 24, and the telephone jack on the electrical access door 24 constitute an emergency notification device. 【0070】 The red indicator light 26 is always illuminated, allowing the location of the fire hydrant device 10 to be identified from a distance. In the event of a fire, when the transmitter 28 is pressed and the push button switch is turned on, a fire alarm signal (transmission signal) is sent to a fire prevention receiver panel installed in the electrical room or elsewhere. The fire prevention receiver panel receives this signal and outputs a fire alarm. Accordingly, the fire prevention receiver panel 12 sends a response signal to the fire hydrant device 10, and upon receiving this, the emergency alarm device flashes the red indicator light 26 and illuminates the response lamp 30. 【0071】 (a3. Internal structure of a fire hydrant system) Next, the internal structure of the fire hydrant device 10 shown in Figure 3 will be described. As shown in Figure 3, the inside of the housing 10a, which serves as the fire hydrant storage section 20, is divided into a valve storage section 2010 and a hose storage section 2020. 【0072】 In the valve housing section 2010, a water tap 50 is connected to a water supply pipe 48 that is drawn in from the outside, and the water supply pipe 48 branches downward and is connected to a fire hose 58 via a fire hydrant valve 52 and an automatic pressure regulating valve 54. 【0073】 The hose storage section 2020 is provided with a hose storage frame 64, and the fire extinguishing hose 58, which is pulled in from below, is stored in an inward winding direction, either clockwise or counterclockwise. A water discharge nozzle 60 is attached to the end of the fire extinguishing hose 58, which is pulled out through a hose guide 66 installed on the back side of the fire hydrant door 16, and the water discharge nozzle 60 is detachably held in a nozzle holder 62 installed on the back side of the fire hydrant door 16. 【0074】 The fire hydrant valve 52 is opened and closed by a fire hydrant valve opening / closing lever 56 provided in an operation box 55 installed on the back side of the fire hydrant door 16, and opens and closes in conjunction with the opening and closing operation of the fire hydrant valve opening / closing lever 56 via a known wire link mechanism provided between an interlocking box 68 provided on the fire hydrant valve 52 and the operation box 55. 【0075】 Furthermore, a pump activation interlocking switch that turns on and off in response to the opening and closing of the fire hydrant valve 52 is built into the interlocking box 68, and a pump activation switch 42 for use by the fire brigade is provided to the upper right of the water tap 50. 【0076】 Furthermore, the nozzle holder 62 is provided with a nozzle removal detection switch 44. The nozzle removal detection switch 44 is a switch that operates when a road user removes the water discharge nozzle 60 from the nozzle holder 62. Its structure and type are arbitrary, but for example, a limit switch equipped with a switch knob or switch lever that extends and retracts in accordance with the attachment and detachment of the water discharge nozzle 60 to and from the nozzle holder 62 can be used. In this embodiment, the nozzle removal detection switch 44 is configured to turn off the switch contact when the water discharge nozzle 60 is held in the nozzle holder 62, and to turn on the switch contact when the water discharge nozzle 60 is removed from the nozzle holder 62. 【0077】 The interior of the housing 10b (the side with the fire extinguisher door 22) is a fire extinguisher storage section 23, which houses two fire extinguishers 40. Terminal boxes 34 and 36 are installed on the rear of the fire extinguisher storage section 23. A red indicator light 26 provided on the electrical door 24 is connected to terminal box 34 via a wiring cable, and a transmitter 28 provided on the electrical door 24, a response lamp 30, a telephone jack 32, a pump start switch 42 provided in the valve storage section 2010, and a pump start interlock switch built into the operation box 55 are connected to terminal box 36 via wiring cables. 【0078】 Furthermore, a cable rack 70 is installed above the valve storage section 2010 within the housing 10a, extending from near the center to the fire hydrant storage section 2020. The cable rack 70 is used to pass through high-voltage cables that are brought into the valve storage section 2010 from the outside to connect to the terminal box 34, low-voltage cables that are brought into the valve storage section 2010 from the outside to connect to the terminal box 36, and wiring cables that connect the pump start switch 42 and the pump start interlock switch built into the operation box 55 to the terminal box 34. 【0079】 Furthermore, a terminal control device 46 is installed below the terminal boxes 34 and 36 on the rear of the fire extinguisher storage section 23, enabling the transmission and reception of signals between it and the disaster prevention receiving panel 12 shown in Figure 1 using the R transmission method. 【0080】 [b. First embodiment of the hose length detection unit] Next, a first embodiment of the hose length detection unit provided in the fire hydrant system will be described in more detail. In this description, refer to Figure 4, which shows a cross-sectional view from the top of the fire hydrant system with the fire hydrant door open; Figure 5, which shows a cross-sectional view from the side of the fire hydrant system with the fire hydrant door open; Figure 6, which shows a first embodiment of the hose length detection unit in which a reading detection unit is provided on a hose guide located on the back surface of the fire hydrant door; and Figure 7, which shows the configuration of the terminal control device corresponding to the first embodiment of the hose length detection unit. Note that Figure 6(A) shows a side view with the fire hydrant door open to the horizontal position, and Figure 6(B) shows a front view in the same state. 【0081】 (b1. Overview of the hose length detection unit) As shown in Figures 4 and 5, the hose length detection unit of the first embodiment optically detects the length of the fire hose 58 that is pulled out through the hose guide 66 when a road user opens the fire hydrant door 16 and takes out the water discharge nozzle 60 from the nozzle holder 62 on the back of the door. 【0082】 Therefore, markers 74 are placed on the fire extinguishing hose 58 at predetermined intervals from the starting end of the hose to which the water discharge nozzle 60 is connected. The spacing of the markers 74 is arbitrary, but since the total length of the fire extinguishing hose 58 is, for example, 30 meters, they are placed at predetermined intervals of 1 meter or less, for example, at 0.5-meter intervals. In addition, in order to enable good optical reading when placed on the fire extinguishing hose 58, the markers 74 need to have a high reflectivity and brightness difference relative to their surroundings. For example, a band with high reflectivity due to gloss and a large brightness difference due to black or white coloring is arranged in a ring shape around the outer circumference of the hose, and is specifically formed by appropriate means such as painting or dyeing. 【0083】 (b2. Structure of the reading detection unit) Furthermore, in order to optically detect the marker 74 placed on the fire hose 58, a reading detection unit 72 is attached and fixed to a hose guide 66 having a rectangular opening through which the fire hose 58 passes and is pulled out. As shown in Figure 6, the reading detection unit 72 is positioned, for example, on the front side of the upper center of the hose guide 66, which is a metal pipe curved into a rectangle and standing upright on the back surface of the fire hydrant door 16, with its detection direction facing the area through which the fire hose 58 passes. 【0084】 The reading detection unit 72 consists of a light-emitting unit 75 and a light-receiving unit 76. The light-emitting unit 75 is equipped with, for example, an LED as a light-emitting element, and emits light through a light-emitting drive onto the fire extinguishing hose 58 as it passes through the rectangular opening of the hose guide 66. The light-receiving unit 76 is positioned next to the light-emitting unit 75 and uses the fire extinguishing hose 58, which is illuminated by light from the light-emitting unit 75 as it passes through the hose guide 66, as its light-receiving field of view. It receives reflected and scattered light from markers 74 placed at predetermined intervals on the fire extinguishing hose 58 and outputs a received light signal whose signal level changes according to the movement of the markers 74. 【0085】 As shown in Figure 7, the reading detection unit 72, which is attached and fixed to the hose guide 66, is connected to the terminal control device 46. The terminal control device 46 includes a control unit 78, a transmission unit 80, a constant voltage circuit 82, a light emission drive unit 83, and a light receiving amplifier unit 84. 【0086】 The control unit 78 is composed of a computer circuit equipped with a CPU, memory, and various input / output ports, and realizes the function of detecting the length of the fire extinguishing hose by executing a control program stored in memory. The control unit 78 may also be composed of appropriate electronic circuits such as logic circuits. 【0087】 Furthermore, a nozzle removal detection switch 44 is connected to the control unit 78. During operation when the water discharge nozzle 60 is held in the nozzle holder 62, the nozzle removal detection switch 44 is off, and the control unit 78 is in a standby state waiting for control. When a road user opens the fire hydrant door 16 to use the fire hydrant device 10 and takes out the water discharge nozzle 60, the nozzle removal detection switch 44 turns on, and the control unit 78 starts detecting the length of the fire hose that has been pulled out. 【0088】 The control unit 78 instructs the light-emitting drive unit 83 to drive the light-emitting unit 75 of the reading detector 72 to emit light, causing the extended fire extinguishing hose 58 to illuminate the area through which the hose guide 66 passes. A received light signal, whose signal level changes in accordance with the movement of the marker 74 placed on the fire extinguishing hose 58, is input to the light-receiving unit 76 of the reading detection unit 72. The received light signal is amplified by the light-receiving amplifier unit 84, then A / D converted and read as received light data into the control unit 78. The control unit 78 detects the passage of the marker 74 from the level change of the read received signal and counts the number of times the marker 74 has been read N. 【0089】 Here, when marker 74 is a white band, the level of the received light signal changes in a pulsed manner, which detects the passage of marker 74 and counts the number of readings N. When marker 74 is a black band, the level of the received light signal changes in a pulsed manner, which detects the passage of marker 74 and counts the number of readings N. In case the light receiving unit 76 fails to read the received light signal due to the reflection of marker 74, a configuration that allows for correction of the number of readings N may be used. For example, multiple markers 74 at 5m, 10m, 20m, and 25m may be arranged at regular intervals (a time interval in which the light receiving unit 76 can react) so that each reflects 2 to 5 pulses of light. 【0090】 Next, the control unit 78 detects the passage of the marker 74 and, each time the reading count N is updated, multiplies it by the spacing between the markers 74, for example 0.5 meters, to calculate the length L of the fire extinguishing hose 58 as (N × 0.5). 【0091】 The extension length L of the fire extinguishing hose 58 calculated by the control unit 78 is transmitted to the disaster prevention receiving panel 12 shown in Figure 1 based on instructions to the transmission unit 80. For example, the extension length L of the fire extinguishing hose 58 is displayed in real time on the display of the disaster prevention receiving panel 12 along with the use of the fire hydrant device 10. 【0092】 If a fire breaks out in a tunnel and a road user operates the transmitter 28 of the fire hydrant system 10 to send a fire alarm signal to the disaster prevention receiving panel 12, the disaster prevention receiving panel 12 will output a fire alarm. As a result, while the fire alarm is output, the length L of the fire extinguishing hose 58 used by the fire hydrant system 10 will be displayed on the disaster prevention receiving panel 12 in real time, allowing the disaster prevention receiving panel 12 to confirm the situation on site where road users are using the fire hydrant system 10 to extinguish the fire. 【0093】 Furthermore, in the disaster prevention receiver panel 12, when the effective length L of the fire extinguishing hose 58 is first displayed, an audio message may be sent to notify the start of firefighting activities using the fire hydrant system. Also, the display of the length L of the fire extinguishing hose 58 on the disaster prevention receiver panel 12 is not limited to a display in meters, but may be displayed as a ratio of the length L to the total length of the 30-meter hose, for example as a percentage or fraction, or as a stage display such as "short, medium, long". 【0094】 [c. Second embodiment of the hose length detection unit] Next, a second embodiment of the hose length detection unit provided in the fire hydrant system will be described in more detail. In this description, refer to Figure 8, which shows a cross-sectional view of a fire hydrant system equipped with the second embodiment of the hose length detection unit that detects the hose extension length by the rotation of a roller, Figure 9, which shows the second embodiment of the hose length detection unit from Figure 8, Figure 10, which shows the structure of the rotation detection unit provided in the hose guide of the second embodiment of the hose length detection unit, and Figure 11, which shows the configuration of the terminal control device corresponding to the second embodiment of the hose length detection unit. Note that Figure 9(A) shows a side view with the fire hydrant door open to the horizontal position, and Figure 9(B) shows a front view in the same state. Also, Figure 10(A) shows a cross-sectional view of the internal structure from the front, Figure 10(B) shows a cross-sectional view of the internal structure from the side, and Figure 10(C) shows a front view. 【0095】 (c1. Overview of the hose length detection unit) As shown in Figures 8 to 10, in the second embodiment, when a road user opens the fire hydrant door 16, takes out the water discharge nozzle 60 from the nozzle holder 62 on the back of the door, and pulls out the fire hose 58 through the hose guide 66, the roller 88 of the rotation detection unit 86 provided on the hose guide 66 rotates in conjunction with the pulling out of the fire hose 58, and the rotation speed of the roller 88 is detected and output to the terminal control device 78, thereby detecting the hose pull-out length of the fire hose 58 based on the rotation speed of the roller 88. 【0096】 (c2. Structure of the rotation detection unit) The structure of the rotation detection unit 86 provided on the hose guide 66 will be described in more detail. As shown in Figure 10, the hose guide 66 has rollers 88 rotatably supported at positions that are on each side of the hose guide body 94, which constitutes a rectangular box frame shape. That is, the rollers 88 are arranged to surround the rectangular hose guide opening 90. 【0097】 The material of the roller 88 is arbitrary, but in order to reduce weight, for example, it is a cylindrical body formed of synthetic resin with both ends closed, and the cylindrical surface is covered with a soft layer such as rubber to ensure frictional rotation due to contact with the fire extinguishing hose 58. 【0098】 Four rollers 88 are arranged in a rectangle around the hose guide opening 90, with bevel gears 92 fixed to the shaft ends on both sides, meshing with other bevel gears 92 fixed to the shaft ends of other adjacent, orthogonal rollers 88. 【0099】 In this way, the four rectangularly arranged rollers 88 are meshed and connected by a pair of bevel gears 92 at their respective orthogonal shaft ends. Therefore, when any of the four rollers 88 rotate due to contact caused by the pulling out of the fire hose 58, the remaining three rollers 88 also rotate simultaneously in the direction that pushes the fire hose out. 【0100】 Furthermore, as shown in Figure 9, when the fire extinguishing hose 58 is pulled out through the hose guide 66, it will not only come into contact with and rotate one of the four rollers 88, but when the fire extinguishing hose 58 is pulled out from a corner of the four rectangularly arranged rollers 88, it will come into contact with and rotate two rollers 88 that are arranged vertically and horizontally. In this case as well, the rotation of the two rollers 88 that the fire extinguishing hose 58 comes into contact with and rotates at the corner will cause the remaining two rollers 88 to rotate simultaneously in the direction that pushes the fire extinguishing hose out. 【0101】 Furthermore, in order to bring the fire extinguishing hose 58 into contact with the inner portion of the four rectangularly arranged rollers 88, the hose guide opening 90, as seen from the front of the hose guide body 94 as shown in Figure 10(C), has an octagonal opening shape to expose the contact portion of the rollers 88 inward. 【0102】 Of the four rollers 88 arranged in a rectangular shape, the shaft 93 on the right side of the upper, horizontally positioned roller 88 is brought out to the outside of the hose guide body 94 and connected to a rotation detector 96 that is attached and fixed to the hose guide body 94. 【0103】 The rotation detector 96 detects the rotation of four rollers 88 that rotate simultaneously in conjunction with each other. Its structure and function are arbitrary, but for example, a rotation pulse detection structure is provided that outputs one pulse signal for each rotation of the rollers 88. This rotation pulse detection structure is configured such that, for example, a slit opening is formed at one location in the radial direction of a rotating disk, and a light-emitting element and a light-receiving element are arranged on either side of the slit opening, and a light-receiving pulse signal is output from the light-receiving element for each rotation of the disk. The rotation detector 96 is not limited to a structure that outputs one pulse signal per rotation, but may have a structure that outputs a predetermined number of pulse signals per rotation, and is not limited to such an optical type, but may also have other forms such as a magnetic type using a magnetoresistive element. 【0104】 The signal line from the rotation detector 96 provided on the hose guide 66 is connected to the control unit 78 of the terminal control device 46 shown in Figure 11. The terminal control device 46, as in the first embodiment shown in Figure 7, includes a control unit 78, a transmission unit 80, and a constant voltage circuit 82, and the power line from the constant voltage circuit 82 is connected to the rotation detector 96 of the hose guide 66 via a power supply switch 98. 【0105】 Furthermore, the control unit 78 is connected to a signal line from the nozzle removal detection switch 44. During operation when the water discharge nozzle 60 is held in the nozzle holder 62, the nozzle removal detection switch 44 is off, and the control unit 78 is in a standby state waiting for control. In the standby state, the power supply switch 98 is also turned off, and power supply to the rotation detector 86 is stopped, thereby reducing power consumption. 【0106】 When a road user opens the fire hydrant door 16 to use the fire hydrant device 10 and takes out the water discharge nozzle 60, the nozzle removal detection switch 44 is turned on, and the control unit 78 starts detecting the length of the fire hose 58 that has been pulled out. 【0107】 When the extension of the fire extinguishing hose 58 begins, at least one of the four rectangularly arranged rollers 88 of the hose guide 66 shown in Figure 10 rotates upon contact with the fire extinguishing hose 58 passing through the hose guide 66. The four rollers 88 rotate simultaneously in a linked manner to push the fire extinguishing hose, and the rotation detector 86 outputs a rotation pulse signal of 1 pulse per rotation. The control unit 78 counts the rotation pulse signals and detects the rotation speed N of the rollers 88. Since the circumference ΔL of the rollers 88 is predetermined, the control unit 78 detects the extension length L of the fire extinguishing hose 58 in real time by multiplying the rotation speed N of the rollers 88 by the circumference ΔL of the rollers 88. 【0108】 Furthermore, in order to ensure that the roller 88 rotates reliably in response to contact with the fire extinguishing hose 58, the surface of the roller 88 is covered with a soft layer such as rubber to increase the coefficient of friction. In addition, to prevent the roller 88 from rotating due to inertia, the bearing structure is set up to generate appropriate frictional resistance in the rotation of the roller 88. 【0109】 The extension length L of the fire extinguishing hose 58 detected by the control unit 78 is transmitted to the disaster prevention receiving panel 12 shown in Figure 1 based on instructions to the transmission unit 80. For example, the extension length L of the fire extinguishing hose 58 is displayed in real time on the display of the disaster prevention receiving panel 12 along with the use of the fire hydrant device 10, making it possible for the disaster prevention receiving panel 12 to confirm the situation at the scene where road users are using the fire hydrant device 10 to extinguish a fire. 【0110】 [d. Third embodiment of the hose length detection unit] Next, a third embodiment of the hose length detection unit provided in the fire hydrant system will be described in more detail. In this description, refer to Figure 12, which shows a cross-sectional view from a plan view of a fire hydrant system equipped with the third embodiment of the hose length detection unit that detects the hose length based on the received radio wave intensity; Figure 13, which shows the configuration of the terminal control device corresponding to the third embodiment of the hose length detection unit; and Figure 14, which shows the relationship between the extended hose length, which is the radio wave propagation distance, and the received radio wave intensity. 【0111】 The hose length detection unit of the third embodiment is composed of a transmitting unit 100, a receiving unit 102, and a terminal control device 46, as shown in Figures 12 to 14. 【0112】 (d1. Transmitter) The transmitter 100 will now be described in detail. The transmitter 100 is located on the water discharge nozzle 60 attached to the tip of the fire extinguishing hose 58. Note that the transmitter 100 may not be externally attached to the water discharge nozzle 60, but may be built into the grip of the water discharge nozzle 60, and the antenna may be located outside the water discharge nozzle 60. When the water discharge nozzle 60 is held in the nozzle holder 62, the transmitter 100 is inactive. When the water discharge nozzle 60 is removed from the nozzle holder 62, the transmitter 100 activates and begins transmitting radio waves. 【0113】 As shown in Figure 13, the transmitting unit 100 is provided with a transmitting circuit unit 104 equipped with an antenna 105, to which positive and negative power lines from a battery power supply 106 are connected, and a power switch 108 is connected to the positive power line. The power switch 108 has a pair of switch contacts 110, and is turned off when one end of an insulating sheet 112 is interposed between the two switch contacts 110. The insulating sheet 112 is detachably attached to, for example, the housing (case) of the transmitting unit 100, and one end of a fixing string 114 is fixed to the other end of the insulating sheet 112 that is exposed to the outside of the housing of the transmitting unit 100, and the other end of the fixing string 114 is fixed to the housing side of the fire hydrant device 10 by a fixing part 116. 【0114】 Therefore, as shown in Figure 12, when a road user opens the fire hydrant door 16 and removes the water nozzle 60 from the nozzle holder 62, the insulating sheet 112 is pulled out from the transmitter unit 100 by the fixing string 114, the pair of switch contacts 110 make contact, the power switch 108 turns on, power is supplied to the transmitting and receiving circuit 104 from the battery power supply 106, it becomes operational, and radio wave transmission begins. 【0115】 (d2. Receiver and terminal control unit) The receiving unit 102 will now be described. As shown in Figure 12, the receiving unit 102 is mounted and fixed at any position within the housing 10a, for example, on the right side of the hose storage frame 64. Also, as shown in Figure 13, a power line is connected to the receiving unit 102, which is equipped with an antenna 103, from the constant voltage circuit 82 of the terminal control device 46 via a power supply switch 98. During operation, the power supply switch 98 is turned off, so the receiving unit 102 stops operating, and power consumption can be reduced. 【0116】 The terminal control device 46 is the same as in the second embodiment shown in Figure 11, and includes a control unit 78, a transmission unit 80, a constant voltage circuit 82, and a power supply switch 98. The control unit 78 is connected to an output signal line from the receiving unit 102 and a nozzle extraction detection switch 44. 【0117】 The nozzle removal detection switch 44 is off during operation when the water discharge nozzle 60 is held in the nozzle holder 62. While the control unit 78 detects that the nozzle removal detection switch 44 is off, it turns off the power supply switch 98 and stops the receiving operation of the receiving unit 102. 【0118】 As shown in Figure 13, when a road user opens the fire hydrant door 16 and removes the water discharge nozzle 60 from the nozzle holder 62, the nozzle removal detection switch 44 turns on. The control unit 78, detecting that the nozzle removal detection switch 44 is on, turns on the power supply switch 98, supplying power to the receiving unit 102 and starting the receiving operation. 【0119】 (d3. Detection of hose pull-out length) The detection of the length of the fire extinguishing hose 58 by the hose length detection unit, which consists of a transmitting unit 100, a receiving unit 102, and a terminal control device 46, will be explained in more detail below. 【0120】 The transmitter 100, which begins operation when the water discharge nozzle 60 is removed from the nozzle holder 62, transmits a signal radio wave using a predetermined frequency band. The frequency band of the signal radio wave transmitted by the transmitter 100 is arbitrary, but for example, the 920MHz band frequency specified for specified low-power radio stations is used. Specifically, one of the 38 channels with an antenna power of 20mW, a frequency band of 920.6~928.1MHz, and an occupied bandwidth of 200KHz, as specified in Article 49-14-7 of the Radio Equipment Regulations, is used, and the 920MHz band does not require carrier sensing. 【0121】 Furthermore, while the signal format of the signal radio waves is arbitrary, a signal radio wave in a predetermined signal format in accordance with the standards for specified low-power radio stations will be used. 【0122】 Furthermore, the frequency used by the transmitter 100 is not limited to the 920MHz band but is arbitrary. For example, it may be a frequency conforming to STD-30 (Standard for Radio Equipment of Low-Power Security System Radio Stations) or STD-T67 (Standard for Radio Equipment for Telemetry, Telecontrol, and Data Transmission of Low-Power Radio Stations), which are known as standard specifications for low-power radio stations in the 400MHz band. 【0123】 The receiving unit 102 receives the signal radio waves transmitted from the transmitting unit 100, which is installed on the water discharge nozzle 60, as the fire extinguishing hose 58 is pulled out, detects the received radio wave strength, and outputs it to the terminal control device 46. The control unit 78 of the terminal control device 46 determines the radio wave propagation distance L from the transmitting unit 100 to the receiving unit 102 based on the received radio wave strength detected by the receiving unit 102, and detects this as the pulled-out length L of the fire extinguishing hose 58. 【0124】 Here, as shown in the characteristic graph of Figure 14, the received radio wave intensity E of the signal radio wave transmitted from the transmitting unit 100 is attenuated inversely proportional to the square of the radio wave propagation distance L, that is, E = 1 / L 2 They are in a relationship. 【0125】 Therefore, the control unit 78 of the terminal control device 46, based on the received radio wave intensity E obtained from the receiving unit 102, L = (1 / E) 1 / 2 The radio wave propagation distance L is calculated and detected as the extension length L of the fire extinguishing hose 58. 【0126】 Here, the relationship in which the received radio wave strength E attenuates inversely proportional to the square of the radio wave propagation distance L is a relationship that can be accurately obtained in line-of-sight communication with few obstacles. However, in actual communication, radio wave propagation conditions often change over time due to obstacles in tunnels, reflections, etc., which can reduce accuracy. 【0127】 Therefore, the transmitting unit 100 repeatedly transmits signal radio waves at a predetermined period, for example, a period of 100 milliseconds, and the receiving unit 102 receives the signal radio waves multiple times over a predetermined period of time and calculates the average value of the received radio wave strength, thereby improving the accuracy of the radio wave propagation distance based on the received radio wave strength. 【0128】 In addition to calculating the length of the fire extinguishing hose 58 based on the radio wave propagation distance using the received radio wave intensity, it is also possible to pre-determine the relationship between the received radio wave intensity and the length of the fire extinguishing hose 58, which is 30 meters in length, by taking out the water discharge nozzle 60 and extending it, and setting this relationship as table data, for example as shown in Figure 14. This data can then be used to read the length of the fire extinguishing hose 58 from the received radio wave intensity when the fire extinguishing hose 58 is extended. 【0129】 The extension length L of the fire extinguishing hose 58 detected by the control unit 78 is transmitted to the disaster prevention receiving panel 12 shown in Figure 1 based on instructions to the transmission unit 80. For example, the extension length L of the fire extinguishing hose 58 is displayed in real time on the display of the disaster prevention receiving panel 12 along with the use of the fire hydrant device 10, making it possible for the disaster prevention receiving panel to confirm the situation at the scene where road users are using the fire hydrant device 10 to extinguish a fire. 【0130】 Furthermore, when the control unit 78 detects the hose extension length L based on the radio wave reception strength, if a road user extends the fire hose 58 and then returns to the fire hydrant device to discharge water depending on the firefighting situation, the distance to the water discharge nozzle 60 (radio wave propagation distance from the transmitter 100 to the receiver 102) decreases, increasing the radio wave reception strength, and a shorter hose extension length L than the previous hose extension length L is detected. However, in reality, the extension length L of the fire hose does not decrease, resulting in an incorrect calculation of the hose extension length L. 【0131】 Therefore, the control unit 78 compares the hose pull-out length (Ln-1) calculated from the average value of the previous radio wave reception strength with the hose pull-out length (Ln) calculated from the average value of the current radio wave reception strength. (Ln) < (Ln-1) If the current hose length is shorter than the previous one, the current hose length (Ln) will not be updated, and the previous hose length (Ln-1) will be maintained. (Ln)≧(Ln-1) If the current hose length is greater than or equal to the previous length, the correct hose length L can be detected by updating the current hose length Ln. 【0132】 (d4. Detection of hose pull-out direction) Next, we will explain how the detection of the direction of withdrawal of the fire extinguishing hose 58 drawn from the fire hydrant device 10 is performed by the processing on the disaster prevention receiving panel 12 side. 【0133】 When the length L of the fire extinguishing hose 58 is detected from the received signal strength of the signal radio waves transmitted from the transmitting unit 100 and received by the receiving unit 102, the direction in which the fire extinguishing hose 58 is pulled out is unknown. 【0134】 Therefore, the disaster prevention receiver 12 instructs the operation of the receiving units 102 of the terminal control devices 46 of the other two fire hydrant devices adjacent to both sides 50 meters away from the fire hydrant device 10 from which the fire hose 58 is pulled out. The two terminal control devices 46 turn on the power supply switch 98 to operate the receiving unit 102, receive the radio waves from the transmitting unit 100 provided on the water discharge nozzle 60 of the pulled-out fire hose 58, detect the received radio wave intensities E1 and E2 respectively, and calculate the radio wave propagation distances L1 and L2. 【0135】 Subsequently, the disaster prevention receiver 12 compares the radio wave propagation distances L1 and L2 detected by the fire hydrant devices adjacent to both sides. If L1 < L2, it detects the hose extraction to the side of the fire hydrant device where the shorter L1 is detected. If L1 > L2, it detects the hose extraction to the side of the fire hydrant device where the shorter L2 is detected. 【0136】 In this way, in addition to the extraction length of the fire hose 58 from the fire hydrant device 10 by the disaster prevention receiver 12, the extraction direction of the fire hose 58 is displayed, enabling the disaster prevention receiver side to more accurately confirm the on-site situation where road users are using the fire hydrant device 10 to extinguish fires. 【0137】 [e. Modification Example of the Present Invention] A modification example of the fire hydrant device according to the present invention will be described. The fire hydrant device of the present invention includes the following modifications in addition to the above-described embodiments. 【0138】 (Optical Detection of Hose Extraction Length) In the first embodiment of the hose length detection unit described above, the hose extraction length is detected by optically reading markers arranged at predetermined intervals on the fire hose. However, the optical detection of the hose extraction length is not limited to this. For example, a known spatial filter type speed detector may be used to detect the hose extraction length. 【0139】 For example, a spatial filter type velocity detector can be attached to the hose guide from which the fire extinguishing hose is drawn out. By detecting the speed of the drawn-out fire extinguishing hose and integrating the detected speed, the hose length can be determined as the amount of movement of the fire extinguishing hose. In this case, since the spatial filter type velocity detector detects the speed by extracting only specific reflective irregularities (color irregularities, unevenness, etc.) from the irregular patterns on the surface of the fire extinguishing hose, there is no need to place markers on the fire extinguishing hose. 【0140】 Furthermore, while the above-mentioned hose length detection units are exemplified by optical, mechanical, and radio wave types, the method also includes detecting the hose length using other appropriate equipment or devices that detect the length of movement of long objects. 【0141】 Furthermore, the above embodiment takes the example of a case where a hose guide, nozzle holder, and fire hydrant valve opening / closing lever are provided on the back surface of a fire hydrant door (inclined door), but is not limited to this. For example, a nozzle holder may be provided on the outside of the hose outlet of the hose storage frame that partitions the hose storage section, and the fire hydrant valve opening / closing lever may be provided directly on the fire hydrant valve. In this case, since the hose guide in the above embodiment corresponds to the hose outlet, the hose guide in the above embodiment may be used as the hose outlet, and the hose guide side of the hose length detection unit may be positioned accordingly. 【0142】 (others) Furthermore, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values ​​shown in the above embodiments. [Explanation of symbols] 【0143】 10: Fire hydrant system 10a, 10b: Enclosure 11a, 11b: Decorative frame 12: Disaster Prevention Receiving Panel 14: Wiring Cables 15: Stand 16: Fire hydrant door 1610: Door handle 18: Maintenance Door 20: Fire hydrant storage area 2010: Valve storage compartment 2020: Hose storage compartment 22: Fire extinguisher door 2210: Door handle 2220: Peephole 23: Fire extinguisher storage compartment 24: Electric Door 26: Red indicator light 28: Transmitter 30: Response lamp 32: Phone hijacking 34,36:Terminal box 40: Fire extinguisher 42: Pump start switch 44: Nozzle removal detection switch 46: Terminal control device 48: Water supply piping 50: Water tap 52: Fire hydrant valve 54: Automatic pressure regulating valve 55: Control Box 56: Fire hydrant valve opening / closing lever 58: Fire hose 60: Water spray nozzle 62: Nozzle holder 64: Hose storage frame 66: Hose Guide 68: Interlocking Box 70: Cable rack 72: Reading detection unit 74: Marker 75: Lighting unit 76: Light receiving part 78: Control Unit 80: Transmission section 82: Constant Voltage Circuit 83: Light-emitting drive unit 84: Light receiving and amplification section 86: Rotation detection unit 88: Laura 90: Hose guide opening 92: Bevel gear 93: Axis 94: Hose guide body 96: Rotation detector 98: Power switch 100: Transmitter 102: Receiver 103,105: Antenna 104: Transmitter Circuit Section 106:Battery power supply 108: Power switch 110: Switch contacts 112: Insulating sheet 114: Fixing rope 116: Fixed part

Claims

[Claim 1] A fire hydrant system in which a fire extinguishing hose stored in a hose storage compartment inside the enclosure is drawn out during firefighting activities, A fire hydrant device characterized by comprising a hose length detection unit that detects the length of the fire extinguishing hose pulled out from the hose storage unit and transmits it to a fire prevention receiving panel. [Claim 2] In the fire hydrant device according to claim 1, The hose length detection unit is Markers are displayed on the aforementioned fire extinguishing hose at predetermined intervals, A reading and detection unit that optically reads the marker and detects the length of the fire extinguishing hose, A fire hydrant device characterized by being equipped with the following features. [Claim 3] In the fire hydrant device according to claim 2, The fire hydrant device is characterized in that the reading detection unit calculates the length of the fire extinguishing hose based on the number of times the optically read markers are read and the display interval of the markers. [Claim 4] In the fire hydrant device according to claim 2, A water nozzle attached to the tip of the aforementioned fire extinguishing hose, A nozzle holding part that detachably holds the aforementioned water discharge nozzle, A nozzle removal detector for detecting the removal of the water discharge nozzle from the nozzle holding portion, Equipped with, A fire hydrant device characterized in that the operation of the reading detection unit is started when the removal of the water discharge nozzle is detected by the nozzle removal detector. [Claim 5] In the fire hydrant device according to claim 1, The hose length detection unit is A roller is positioned on the withdrawal side of the fire extinguishing hose and rotates as the fire extinguishing hose is withdrawn, A rotation detection unit that detects the length of the fire extinguishing hose pulled out based on the rotation of the roller, A fire hydrant device characterized by being equipped with the following features. [Claim 6] In the fire hydrant device according to claim 5, The rollers are rotatably mounted on each side of a hose guide having a rectangular opening, and are connected by a gear mechanism such that when at least one roller rotates, all the other rollers rotate simultaneously in conjunction. The fire hydrant device is characterized in that the rotation detection unit includes a rotation detector that detects the rotation of any of the plurality of rollers, and calculates the length of the fire extinguishing hose based on the rotation speed detected by the rotation detector and the circumference of the roller. [Claim 7] In the fire hydrant device according to claim 5, A water nozzle attached to the tip of the aforementioned fire extinguishing hose, A nozzle holding part that detachably holds the aforementioned water discharge nozzle, A nozzle removal detector for detecting the removal of the water discharge nozzle from the nozzle holding portion, Equipped with, A fire hydrant device characterized in that the rotation detection unit starts operating when the nozzle removal detector detects the removal of the water discharge nozzle. [Claim 8] In the fire hydrant device according to claim 1, The hose length detection unit is A transmitting unit is installed on the water nozzle attached to the tip of the aforementioned fire extinguishing hose and transmits radio waves in a timely manner. A receiving detection unit is installed on the housing side and detects the length of the fire extinguishing hose based on the received signal strength of the radio waves transmitted from the transmitting unit, A fire hydrant device characterized by being equipped with the following features. [Claim 9] In the fire hydrant device according to claim 8, The nozzle holder portion is provided for detachably holding the aforementioned water discharge nozzle. The fire hydrant device is characterized in that the transmitting unit has a built-in battery power supply, and when the water discharge nozzle is removed from the nozzle holding unit, the battery power supply is turned on and the transmission of the radio waves is started. [Claim 10] In the fire hydrant device according to claim 9, The fire hydrant device is characterized in that the transmitting unit is equipped with a switch that turns off when an insulating sheet is interposed in the power supply line of the battery power supply, and the switch turns on when the insulating sheet is removed in conjunction with the removal of the water discharge nozzle from the nozzle holding part. [Claim 11] In the fire hydrant device according to claim 10, The fire hydrant device is characterized in that the transmitting unit is equipped with a fixing string that connects one end of the insulating sheet to the housing side, and the switch turns on when the insulating sheet is pulled out from the power supply line by the fixing string in conjunction with the removal of the water discharge nozzle from the nozzle holding part. [Claim 12] In the fire hydrant device according to claim 8, A nozzle holding part that detachably holds the aforementioned water discharge nozzle, A nozzle removal detector for detecting the removal of the water discharge nozzle from the nozzle holding portion, Equipped with, A fire hydrant device characterized in that the operation of the receiving detection unit is started when the removal of the water discharge nozzle is detected by the nozzle removal detector.

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