JP2018068672A - Spreading fire prevention agent and fire extinguishing tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a deluge system using fire extinguishing water has to spray the fire extinguishing water continually for spreading fire prevention because the fire extinguishing water flows out from plant roofs such as thatched roofs in and after spraying, and has to prepare for a large quantity of the fire extinguishing water.SOLUTION: Spreading fire is prevented and fire is extinguished by spraying spreading fire prevention agent which is an agent with high viscosity instead of fire extinguishing water and applying it to plant roofs. Spraying amount can be reduced because the agent with high viscosity sprayed to the plant roofs to prevent spreading fire and to extinguish fire remain in the place. The spreading fire prevention agent has viscosity to remain in the plant roofs and comprises thixotropy with specified viscosity to reduce pressure drop in pipings and hoses in spraying.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire spread prevention agent used for fire spread prevention and fire extinguishing, and a fire extinguishing tank storing a fire spread prevention chemical.

  Among the houses protected as cultural properties, there are old houses with plant roofs such as thatched roofs. Plant roofs such as thatched roofs have a high risk of ignition spread due to flying from surrounding fires, and once fired, extinguishing is very difficult. As a fire spread prevention equipment for protecting a house having such a plant roof from a fire, watering equipment such as a water spray gun and a drainage equipment may be installed (Patent Document 1).

JP-A-9-154969

  In sprinkling facilities using these fire-extinguishing water, fire-extinguishing water flows out from the plant roof during and after spraying, so it is necessary to spray fire-extinguishing water continuously to prevent the spread of fire. Therefore, a large amount of fire-fighting water had to be prepared. However, the area around cultural property houses, etc. is not necessarily rich in water sources for fire extinguishing water. When fire water is limited, fire water is used to extinguish combustibles and cannot be used for preventive water discharge. Therefore, it was necessary to provide a large fire extinguishing water storage facility. However, there are often no places for installing large fire extinguishing water storage facilities such as large-capacity tanks around cultural property houses. In addition, a large cost is required to install a large capacity tank.

  Therefore, the present inventor thinks that if a high-viscosity chemical is sprayed on an object to prevent fire spread or extinguishes, the high-viscosity chemical stays in the place where the high-viscosity chemical is sprayed. We studied spraying fire prevention and fire extinguishing by spraying a fire spreading prevention agent, which is a highly viscous chemical, and attaching it to plant roofs. Plant roofs such as thatched roofs often have steep slopes. The spread fire prevention agent requires a viscosity that is retained on the steep roof surface of a plant roof such as a thatched roof during spraying, but at the same time, it is necessary to reduce the pressure loss due to the viscosity in the piping and hoses during spraying. It was. Therefore, the fire spread preventing agent has a high thixotropic property so that the viscosity becomes low when moving in the pipe or hose. Thixotropic property is a property in which the viscosity decreases due to shear stress and increases when it is stationary.

(1) The present invention is a fire spread prevention agent having thixotropy in which an inorganic substance is dispersed in water, and after sufficiently stirring the fire spread prevention agent, a filling amount of 16 by a spindle of SC4-25 with a B type viscometer. The viscosity immediately after stirring for 1 minute at 1 mL is 73 to 3,690 mPa · s when the rotational speed is 130 rpm (shear rate is 28.6 (1 / s)), and (a) the rotational speed is 60 rpm ( When the shear rate is 13.2 (1 / s)), the viscosity is 90 to 8,000 mPa · s, the rotational speed is 1.2 to 2.2 times the viscosity at 130 rpm, and (c) the rotational speed is 6 rpm. (Shear rate is 1.32 (1 / s)) 880 to 64,000 mPa · s, and the rotational speed is 12.1 to 17.3 times the viscosity at 130 rpm. It is a drug.

  According to the present invention, the fire spread prevention agent is held on a steep plant roof such as a thatched roof in a stationary state, and the inside of the pipe can be pumped at a low viscosity that is reduced during spraying.

(2) Moreover, this invention is a fire extinguishing tank which stored the fire spread chemical | drug | medicine of (1).

  According to the present invention, it is possible to store in a fire extinguishing tank a fire-extinguishing agent that is held on a steep plant roof such as a thatched roof in a stationary state and is pumped through a pipe with a low viscosity reduced by thixotropy when sprayed. The tank can be reduced in size.

The figure showing the spreading experiment to the thatched roof model 1. FIG.

The following experiment was conducted on the fire spread prevention agent so that it could be sprayed onto a steep plant roof such as a thatched roof.
Sumenite (registered trademark) SA of Kunimine Kogyo Co., Ltd., which is a saponite, was added to water in various amounts and dispersed by stirring to prepare a saponite solution having a plurality of concentrations.
Then, we made a model of a thatched roof and conducted a spraying experiment. FIG. 1 shows a spraying experiment on a thatched roof model 1. A thatched roof model 1 having a width of 1 m, a sloping surface with a vertical spacing of 1.6 m, and a thickness of 0.4 m was prepared such that the roof surface 11 had an inclination angle of 45 degrees, and was installed on the fixed base 2. . Further, the spray nozzle 3 is installed at an angle of 40 degrees upward from the horizontal direction so that the tip is located 2.5 m downward from the bottom of the thatched roof model 1 and 8.5 m laterally. . Then, the saponite solution 4 was sprayed from the spray nozzle 3 toward the thatched roof model 1 so as to be as uniform as possible. The arrows in FIG. 1 indicate the mainstream trajectory of the saponite solution 4, but the saponite solution 4 spreads to some extent and is spread toward the roof surface of the thatched roof model 1.

  The saponite solution 4 is held on the surface of the thatched roof model 1 by thixotropy, and the viscosity of the saponite solution 4 is lowered and fluidized inside a pipe or a hose (not shown). According to the experiment, the fire-extinguishing water not mixed with saponite flowed downward without being held on the roof surface 11 of the thatched roof model 1 and flowed out of the eaves. However, the saponite solution having a weight concentration of 1% was barely adhered and held on the roof surface 11 of the thatched roof model 1. The saponite solution having a concentration of 1% or more by weight adhered to the roof surface 11 of the thatched roof model 1 and was held. The saponite solution with a 2% weight concentration has 8.5 times the adhesion rate of fire extinguishing water that is not mixed with saponite, and the amount of penetration into the inside of thatched roof is 8.5 times that of extinguishing water that does not contain saponite. Met. The adhesion includes penetration into the thatched roof model 1. The adhesion rate is obtained by dividing the total of the adhesion amount of the saponite solution 4 adhered to the roof surface 11 and the penetration amount permeated into the thatched roof model 1 by the application amount. The penetration amount was obtained by sucking the saponite solution 4 adhering to the roof surface 11 with a vacuum cleaner, measuring the weight, and subtracting it from the spray amount.

  A sufficient adhesion rate was obtained even with a saponite solution having a weight concentration of 4%. However, in the case of an accumulator package type fire spread prevention equipment in which gas is sealed in a tank and the saponite solution is pre-pressurized, if the weight concentration exceeds 4%, the pressure required for pumping the saponite solution 4 is increased. It was difficult to secure.

  From the above, a smecton (registered trademark) SA solution having a weight concentration of 1 to 4% is suitable as a fire spread prevention agent. Accordingly, thixotropic properties of a smecton (registered trademark) SA solution having a weight concentration of 1 to 4% were examined using a B-type viscometer as follows.

Saponite (registered trademark) SA, which is saponite, is added to water and dispersed to prepare a saponite solution. Hand shake the container containing the saponite solution so that it is sufficiently stirred, using ˜2 minutes as a guide. Then, 16.1 mL was filled in the sample chamber, the following rotation speed was added with a spindle of SC4-25 with a B-type viscometer, and the viscosity immediately after 1 minute was measured. This was done for each concentration of saponite solution.
(A) Rotation speed 130 rpm (shear speed 28.6 (1 / s))
(A) Rotational speed 60 rpm (shear speed 13.2 (1 / s))
(C) Rotation speed 6 rpm (shear rate 1.32 (1 / s))
As a result, the viscosity shown in Table 1 was obtained.

Therefore, a thixotropic anti-spreading agent in which an inorganic substance is dispersed in water is stirred at 1400 rpm for 3 minutes, then stirred by handshaking in a container for 1 to 2 minutes, and filled with a SC4-25 spindle with a B-type viscometer. The viscosity when stirring for 1 minute at an amount of 16.1 mL is 73 to 3,690 mPa · s when the rotational speed is 130 rpm (shear rate is 28.6 (1 / s)),
(B) When the rotational speed is 60 rpm (shear rate is 13.2 (1 / s)), the rotational speed is 90 to 8,000 mPa · s, and the rotational speed is 1.2 to 2.2 times the viscosity at 130 rpm. ,
(C) When the rotational speed is 6 rpm (shear rate is 1.32 (1 / s)), it is 880 to 64,000 mPa · s, and the rotational speed is 12.1 to 17.3 times the viscosity at 130 rpm. If it is a fire spread prevention agent that has thixotropy and dispersed inorganic substances in water, it stays on the roof of steep slopes like thatched roof and has the function of extinguishing fire, and has the function of extinguishing fire, compared to fire water The amount of application can be reduced. The fire spread prevention chemical is stored and used in a fire extinguishing tank, but since the amount of spraying can be reduced, the capacity of the fire extinguishing tank can be reduced.

  In the embodiment, smecton (registered trademark) SA of Kunimine Kogyo Co., Ltd. was used as a fire spread prevention agent. However, the adhesion rate related to fire spread prevention and fire extinguishing has the above-mentioned viscosities (a) to (c). It is the same. Therefore, as long as it has the above-mentioned viscosities (a) to (c), it may be a fire spread preventing agent having thixotropy mixed with other inorganic substances. Moreover, in the experiment described, although it described about the plant roof which has 45 degree | times inclination, the substantially same result was obtained even if inclination was 40 to 60 degree | times.

1 Thatched roof model, 11 Roof surface, 2 Fixing stand, 3 Spray nozzle, 4 Saponite solution

Claims (2)

A fire spread prevention agent having thixotropic properties in which an inorganic substance is dispersed in water,
After thoroughly stirring the fire spread prevention agent, the viscosity immediately after stirring for 1 minute at a filling amount of 16.1 mL with a SC4-25 spindle with a B-type viscometer is (a) 73 to 3,690 mPa · s,
(B) The rotation speed is 90 to 8,000 mPa · s at 60 rpm, and the rotation speed is 1.2 to 2.2 times the viscosity at 130 rpm.
(C) A fire spread prevention agent characterized by having a rotational speed of 880 to 64,000 mPa · s at 6 rpm and a rotational speed of 12.1 to 17.3 times the viscosity at 130 rpm.   A fire extinguishing tank storing the fire spread prevention agent according to claim 1.

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