JPS5949020B2 - How to prevent fire spread - Google Patents

Description

[Detailed Description of the Invention] This invention provides for
This relates to a method of preventing this fire from spreading to other nearby buildings.

When a fire occurs, it goes without saying that it is important to extinguish the fire itself, but it is also important to take measures to prevent the spread of the fire so that it does not spread to other nearby buildings. This is another important issue.

However, in the event of a fire, the combustion temperature of a house, etc. is usually a high temperature exceeding 1000 degrees Celsius, and the radiant heat exceeds the heat resistance temperature of general housing building materials, so if a fire breaks out in a single house, etc. Houses in close proximity to each other would go up in flames one after another.

For this reason, once a fire breaks out, especially in areas where houses and other buildings are densely packed, it is likely that the fire will spread to other buildings one after another and develop into a large-scale fire that spreads over an extremely wide area. It is customary.

In order to prevent large-scale fires, firefighting activities are carried out.
There are two main conventional methods of preventing the spread of fire that have been used in emergencies.One is to spray water on neighboring buildings where there is no fire, and the heat of vaporization of this water lowers the temperature of the surface of the house. Another method is to demolish nearby houses that are not on fire and prevent the fire from spreading to a wider area.

However, the former method is reasonably effective if the building is relatively small and located relatively far from the fire site, but in other cases, the amount of water to be sprayed is However, compared to the number of personnel that should be invested, the effects can hardly be recognized.

In addition, the latter method requires a considerable amount of manpower and labor, so it is not very practical as an emergency activity, and even if it were possible, it would have the fatal disadvantage of risking human life and causing economic loss. be.

This invention was made as a result of studies in view of the above-mentioned problems with conventional fire spread prevention means. A water curtain is formed on the surface of the fire, and this water curtain blocks radiant heat, thereby making it possible to effectively prevent the spread of fire in a simple and quick manner.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

In the method according to the present invention, first, as shown in FIG. 1, a hose 1 having a large number of injection ports 2, 2, . . . in the longitudinal direction is prepared.

As the hose 1, it is preferable to use a flexible rubberized hose that is generally used for firefighting purposes, and its inner diameter is suitably about 40 to 65 mm.

The injection port 2゜2... is 30 mm between the joints 3 and 4.
It is best to open holes at intervals of about 1.5 cm.For example, as shown in the figure, holes are opened at regular intervals, and eyelets 5 are added to the holes for reinforcement.
．． It is appropriate to crimp 5... to a diameter of about 5 mm.

If a fire breaks out there, as shown in Figure 2, the hose 1 is laid between the building 6 that is on fire and another nearby building 7 that is not yet on fire, and the hose 1 is installed at the injection port. 2,
2 is directed toward the road, and a nonflammable liquid such as water is pumped into the hose 1.

Then, this water and the like are sprayed upward from the respective spray ports 2, 2, . . . , so that a water curtain 8 is formed between the buildings 6 and 7.

According to experiments conducted by the inventors of the present invention, a rubberized hose 1 with a nominal diameter of 65 mm (hose inner diameter 65 ± 1.5 mm) and a length of 20 m was fitted with injection ports 2, 2 and 2 with an old diameter of 5 mm at intervals of 30 cm.
... was opened and water was pumped through it at a water pressure of 4 kg/-, a water curtain 8 with a height of approximately 6 m was formed, and the water pressure was further increased to 9.
When water was pumped at a rate of kg/ctII2, a water curtain 8 with a height of about 10 m was formed.

That is, by adjusting the water pressure in this way, it is possible to form a water curtain of a required height depending on the height of the building and the fire situation.

For example, if the hose 1 is installed at a fixed location and water is sprayed downward from there, the height of the water curtain is fixed and is limited to a fixed height. , there is no such disadvantage with this invention.

Moreover, since it is possible to use the water that is injected upwards and the water that reaches the highest point and falls, a water curtain with approximately twice the density can be formed at the same flow rate compared to the above case where the water is injected downwards. I can do it.

Furthermore, radiometers 9 and 10 were placed on both sides of this water curtain 8, that is, on the sides of buildings 6 and 7, respectively, and the radiant heat from the flames of building 6 was measured. It was confirmed that the radiant heat was reduced to about 173 to 174.

That is, it has become clear that approximately 273 to 374 of the radiant heat that the building 7 receives from the flames of the building 6 is blocked by the water curtain 8.

Mainly, the water curtain 8 can prevent a fire in the building 6 from spreading to the building 7 by blocking the radiant heat, but the water curtain 8 also prevents the minute water spray that will be generated. It also has the effect of moistening the surrounding air and making the building 7 etc. more difficult to burn.

It has also been confirmed that this water curtain 8 blocks the passage of harmful gases generated by a fire, and in addition, many of the harmful gases are dissolved in this water curtain 8 and removed from the air. It also becomes.

As explained above, according to the present invention, a water curtain 8 is provided between the building 6 that is on fire and the building 7 that is not yet on fire.
By forming the water curtain 8, it is possible to block the radiant heat from the flames of the fire.
Since it can be formed by force-feeding a nonflammable liquid such as water, it is possible to achieve the purpose of preventing the spread of fire quickly and without the need for manpower in the event of an emergency fire.

In addition, since water is sprayed upward, it is possible to form a water curtain of the required height by adjusting the water pressure, and since it is possible to use the water that spouts up and the water that falls, it is the same as when spraying water downward. A water curtain with approximately twice the density can be formed at the flow rate.

Therefore, in the event of a fire, there is no need to demolish surrounding buildings, and dangerous work is not required to prevent the spread of fire, so the danger to human life and economic loss can be significantly reduced. It becomes like this.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a hose used in carrying out this invention, and FIG. 2 is a schematic explanatory diagram showing one embodiment of this invention. 1...Hose, 2...Injection port, 5...Eyelet, 6,
7...Buildings, 8...Water curtains.

Claims (1)

[Claims] 1. A highly pressure-resistant hose with a large number of injection ports along its length is prepared, and the hose is connected to a building that is on fire and a building that is still on fire, with the injection ports facing upward. A non-flammable liquid such as water is pumped through this hose and is sprayed upward from the injection port, between the two buildings. A method for preventing the spread of fire, characterized by forming a water curtain. 2. The method for preventing the spread of fire according to claim 1, wherein the injection ports are formed by pressing eyelets into through holes drilled at regular intervals in the longitudinal direction of the hose.