JPS5818910Y2 - Tunnel fire extinguishing system - Google Patents

Description

[Detailed description of the invention] The present invention relates to a fire extinguishing system for tunnels that sprays water by sending water to a water spray head installed in a tunnel in the event of a fire, and in particular can effectively prevent the spread of fire due to fuel flowing out in the event of a fire. The present invention relates to the structure of a fire extinguishing system for tunnels.

Conventionally, as shown in FIG. 1, this type of fire extinguishing system generally has a fixed water spray head 1 disposed on the ceiling surface or ceiling side wall in a tunnel, and when a passing vehicle 2 starts a fire, it extinguishes the fire. The pump is started and fire extinguishing water is sprayed from a water spray head 1, so that water can be sprayed from above the vehicle 2 onto a vehicle that is on fire.

By the way, when we look at the spread of fire caused by vehicle fires in tunnels, we mainly see that fuel spilled out due to collisions, etc. flows on the road surface while burning, and spreads to nearby vehicles one after another while crawling under the vehicle body. be.

To prevent the spread of fires caused by such fuel spills, conventional fire extinguishing systems spray water from above the vehicle, as shown in Figure 1. However, there is a problem in that the initial extinguishment is delayed and the fire is allowed to spread.

The present invention was developed in view of the above, and in addition to spraying from the top, the fuel is sprayed from the bottom of the tunnel side wall between the bottom of the vehicle body and the road surface to prevent the spread of fire caused by fuel spilled in an accident. It is an object of the present invention to provide a fire extinguishing system for a tunnel that extinguishes a fire in its initial stage and suppresses the spread of the fire.

The present invention will be explained below based on the drawings.

FIG. 2 shows an embodiment of the present invention, taking as an example a case where a water spray nozzle is used as the fire extinguishing head.

First of all, to explain stealing, in general, inside tunnels for automobiles, for example, expressways, people engaged in maintenance management can safely carry out inspection work inside the tunnel.
A passageway 3 with a raised back to a height of about 1 m is provided on both sides along the back of the road in the tunnel.

Therefore, in the embodiment shown in FIG. 2, in addition to the first water spray head 1 installed on the ceiling side wall, a second water spray head 4 for preventing the spread of fire is installed on the roadside portion of the passageway 3 in the longitudinal direction of the tunnel. Install at intervals.

Water is supplied to the sprinkler heads 1 and 3 through a branch pipe 7 that branches off from the main water supply pipe 5 via a district control valve 6.

Of course, in a tunnel that does not have a passageway 3 at the back of the road, the water spray head 4 is installed at the lower part of the side surface of the tunnel.

The height of the water spray head 4 from the road surface is set at a height between the bottom of the vehicle body and the road surface so that the fire extinguishing water can be directed directly to the road surface without being obstructed by the vehicle. .

FIG. 3 is a cross-sectional view showing an example of the mounting structure of the water spray head 4 in the embodiment of FIG. 2.

That is, a storage chamber 8 is formed inside the road side of the passageway 3, a water spray head 4 that sprays water in the direction of the roadway is installed in this storage chamber 8, and an inspection port with an inspection lid 9 attached to the upper part of the storage chamber 8 is installed. At the same time, the front part of the water spray head 4 is covered with a front plate 10, and a removable protection plate 11 is fitted to this plate 10 to protect the water spray head 4 inside the storage chamber 8. Drainage ditch 12 on the back of the road to drain water accumulated in
A drainage pipe 13 is provided leading to.

The water spray nozzle 14 as a spray nozzle of the water spray head 4 installed in the storage room 8 has a structure in which when water pressure is applied through the pipe 15, the nozzle 14 extends forward with respect to the head body 16 due to water pressure. By extension of the nozzle 14, the protection plate 11 is removed and water can be sprayed into the tunnel.

The structure of the water spray head in which the water spray nozzle 14 expands due to water pressure is shown in half cross section in FIG.

That is, the water nozzle 14 is screwed onto an outer cylinder 17 that is slidably attached in the axial direction to an inner cylinder 18 that is fixed to a piping section. Normally, they are in a contracted state where they are close to each other, but when water is supplied, a force in the direction of water spraying acts on the water spray head 4 due to the water pressure due to the constriction structure of the nozzle 14, and the nozzle 1
4 extends together with the outer cylinder 17 against the spring 19.

Incidentally, since the water pressure during water sprinkling is usually 3.5 kg/Cm2 or more, the rolling pressure of the spring 19 is set to be lower than that, for example, 0.8 kg/Cm2.

With such an elongated structure, when the water spray head receives water, the water nozzle automatically removes the protective plate and extends, and the nozzle tip protrudes into the tunnel to spray water.

FIG. 5 shows an enlarged view of the attachment structure of the protection plate 11 shown in FIG. 3, and FIG. 6 further shows the clamping structure of the protection plate 11 to the front plate 10.

That is, the protection plate 11 is formed of an inner protection plate 11a and an outer protection plate 11b, and is moored by a chain 20 so as not to be lost when detached, and the front plate 10
As shown in FIG. 6, the clamp structure for this includes a hook-shaped flange 21 protruding from the front plate 10 that is inserted between the inner and outer protection plates 11 a and 11 b, and a spring 2
It is locked by the ball 23 pressed by 2.

The protection plate 11 having such a ramp structure is pushed from the inside by the expansion of the water pressure of the water spray nozzle 14, and is removed from the front plate 10, opening the front surface of the water spray nozzle 14 and allowing water to be sprayed into the tunnel. enable.

In addition, during normal times, the water nozzle 14 is protected so that it can always be used by preventing dust and dust from entering from the outside, or from mischief.

In addition, in tunnels equipped with a median strip, a fire extinguishing head may be installed in the median strip and the fire extinguishers may be sprayed into the space between the bottom of the vehicle and the tunnel road surface.

Further, the clamping structure of the protection plate 11 is not limited to the above-mentioned embodiment, and may be any clamping structure that can be removed by extension of the water spray nozzle.

On the other hand, in the above embodiment, fire extinguishing water is sprayed from water spray heads provided at the upper and lower parts of the tunnel.
In another embodiment, a mixed fire extinguishing system may be used in which a foam head is used to spray fire extinguishing water from an upper sprinkler head and discharge foam from a lower fire head.

Furthermore, the upper water sprinkling head may also be of a wall-embedded type similar to the lower water sprinkling head, and may have a structure in which the nozzle expands when water is supplied, automatically removes the protective plate, and starts water sprinkling.

As explained above, according to the present invention, in addition to the upper fire extinguishing head provided on the ceiling surface or ceiling side wall surface, a lower fire extinguishing head is provided to spray in the space between the bottom of the vehicle body and the road surface. As a result, fires in vehicle cargo, etc. are effectively extinguished by the upper fire extinguishing head, and the spread of fire caused by fuel spilled onto the road surface due to accidents, etc. is prevented by water spray from the lower fire extinguishing head. Therefore, it is possible to effectively suppress fire extinguishment without causing any ignition, and to wash away fuel spilled onto the road surface before it ignites.

In addition, the lower fire extinguishing head, which is easily affected by dirt and dust caused by vehicle traffic, is recessed into the tunnel side wall so that it can always be kept ready for spraying.
In the event of a fire, the nozzle automatically extends due to pressure, removes the protective plate, and sprays while protruding to the outside, so the water spray pattern is not obstructed by the storage area, and nozzles with any water spray pattern can be used. It's possible.

Note that this invention is not limited to spraying fire extinguishing water;
It can also be applied to CO2 gas fire extinguishing systems, etc. In addition to tunnels, it can also be used as fire extinguishing systems equipped with open water nozzles, such as inside paint booths or places where there is a lot of dust. can.

Further, by combining the present invention with the fire extinguishing equipment for tunnels disclosed in Japanese Patent Application No. 111402/1983 proposed by the applicant of the present application, it becomes possible to extinguish fires in tunnels even more effectively.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional tunnel fire extinguishing system, Fig. 2 is an explanatory diagram showing an embodiment of the present invention, and Fig. 3 is an illustration of the mounting structure of the lower water spray head in the embodiment of Fig. 2. 4 is a half sectional view showing an example of the elongated structure of the water spray head used in the embodiment of FIG. 3, and FIG. 5 is a cross-sectional view of the protection plate in the embodiment of FIG. 3. The mounting state is illustrated in an enlarged explanatory view, and FIG. 6 is a sectional view showing the protective clamp structure. 1... Water spray head (upper part), 2... Vehicle, 3... Passage, 4... Water spray head (
Lower part), 5... Main water supply pipe, 6... District control valve, 7... Branch pipe, 8... Storage room,
9...Inspection lid, 10...Front plate, 11...Protection plate, 12...Drain groove,
13... Drain pipe, 14... Water nozzle, 15... Piping, 16... Head body, 17... Outer cylinder, 18 ...Inner cylinder,
19... Spring, 20... Chain, 21... Flange, 22... Spring, 2
3...Ball.

Claims (3)

[Scope of utility model registration request] (1) In tunnel fire extinguishing equipment that sprays water from a fire extinguishing head installed in the tunnel in the event of a fire, the first fire extinguishing head is installed on the side wall of the tunnel ceiling and has a spray pattern that sprays toward the tunnel road surface, and the side surface of the tunnel. A fire extinguishing system for a tunnel, characterized in that it is provided with a second fire extinguishing head that is installed at the lower part or the median strip and has a water sprinkling pattern toward the space between the bottom of the vehicle body of passing vehicles and the tunnel road surface. (2) The tunnel fire extinguishing device according to item 1, wherein the second fire extinguishing head has a spray nozzle that expands due to the pressure sent during spraying. (3) The tunnel fire extinguishing system according to item 2, wherein the second fire extinguishing head is provided with a protective plate on the front surface of the housing portion of the spray nozzle, which is removed when the spray nozzle is extended.