JP2002102377A - Fire-fighting system for gas construction site and shielding device to be used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-fighting system and a shielding device to be used therefor, with which the occurrence of a secondary disaster to instantaneously emit a large quantity of gases can be prevented and a temporary disaster such as fire can be simultaneously prevented by quick dealing as well. SOLUTION: On a construction site to perform a construction while maintaining the state of making gases flow inside a pipe, a fire extinguishing agent, which is fire-resistant, generates viscosity by mixing and contains a foamed solidification agent to be quickly solidified, is sprayed to a fire, which occurs in the construction block. Thus, the inside of the pipe is sealed at the pipe end part in the construction block at least and by surrounding the periphery of the pipe end part, the emission of gases flowing inside a conduit is blocked so that the fire can be extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing system and a shut-off device used for the same, and more particularly, to a fire extinguishing system and a structure for preventing a gas from being blown out by a combustible gas such as a gas pipe.

[0002]

2. Description of the Related Art Conventionally, when performing work such as replacement work for a gas pipe buried underground, both sides of a replacement place are shut off with a bag or the like so that gas does not leak. .

If gas leaks from the bag insertion hole drilled in the gas pipe or the pipe ends on both sides of the replacement part during the gas pipe work described above, there is a danger that fire will ignite the leaked gas and cause a fire. is there. In the case of a temporary fire due to ignition, the fire is suppressed by lowering the combustion temperature or cutting off oxygen by injecting digestive organs, earth and sand, rags, water or emergency grease, and gas emission is cut off.

[0004]

Although it is possible to extinguish a fire by the above measures, if the bag is completely damaged by this temporary fire, a large amount of gas will be released after the fire is extinguished. May erupt into the surroundings, igniting fire which may cause secondary disasters such as gas explosions. Furthermore, depending on the material used for extinguishing a fire, for example, when water is used, it may enter the pipe and accumulate in a low position. For this reason, the gas flow path may be interrupted, which hinders resumption of gas supply. If the water used for fire extinguishing is left unattended, for example, if it reaches the position of the gas meter and is left unattended, the meter will not operate when the temperature drops in winter or the like. Furthermore, leaving water may cause corrosion of pipelines and malfunction of gas appliances at the supply destination.

On the other hand, when a fire occurs, it is necessary to prevent the gas from being blown out. Conventionally, grease is introduced from a pipe near the fire spot as described above. It takes time to prepare equipment for enabling the pumping of gas, and when a large amount of gas is ejected instantaneously, it is difficult to suppress the ejection.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional fire extinguishing system, an object of the present invention is to prevent the occurrence of a secondary disaster in which a large amount of gas is spouted instantaneously, and to immediately cope with a temporary disaster such as a fire. An object of the present invention is to provide a fire extinguishing system that can be prevented and a shutoff device used for the same.

[0007]

In order to achieve this object, the invention according to claim 1 has been developed in a construction site where a construction is performed while maintaining a state in which gas is flowing inside a pipe in the construction section. By injecting a fire extinguishing agent containing a foaming and solidifying agent that is flame-retardant and generates viscosity by mixing and can be solidified at an early stage, it seals the inside of the pipe at least at the pipe end in the construction section. By surrounding the end of the pipe, it is possible to prevent the gas flowing in the pipe from being blown out and extinguish the fire.

According to the first aspect of the present invention, a fire extinguishing agent containing a foaming and solidifying agent which is flame-retardant and generates viscosity by mixing and can be solidified at an early stage is injected to seal the inside of the pipe end and the pipe end. By surrounding the periphery with a fire extinguishing agent, it is possible to suppress the emission of flammable gas that causes a fire and to extinguish the fire. In particular, since the fire extinguishing agent is injected, directing of the fire extinguishing agent to an intended position becomes easy, and accurate extinguishing of the fire extinguishing agent to a place where fire suppression is required can be performed.

According to the first aspect of the present invention, the injected fire extinguishing agent adheres to the inside of the pipe end and the vicinity of the pipe end due to its own viscosity, and is further solidified at an earlier time, thereby damaging the gas emission from the inside of the pipe. Since it is possible to stop and also suppress the ejection to the peripheral portion, the ejection state of the combustible gas is stopped almost instantaneously, thereby extinguishing a temporary fire and suppressing gas ejection, thereby preventing a secondary disaster.

According to a second aspect of the present invention, in the fire extinguishing system in a gas construction site according to the first aspect, the extinguishing agent gels from a creamy state by mixing, and is solidified when the extinguishing agent reaches the pipe end by being sprayed. The new fire extinguishing agent is piled up on the solidified surface and solidified, thereby sealing the inside of the tube against the pressure inside the tube and accumulating around the end of the tube to surround the periphery. It is characterized in that possible materials are used.

According to the second aspect of the present invention, a fire extinguishing agent that is continuously sprayed is superimposed on the previously solidified fire extinguishing agent by using a material that gels from a creamy state by mixing and solidifies when reaching the pipe end by spraying. To increase the volume thickness. Accordingly, it is possible to secure a thickness capable of blocking the ejection of the gas against the pressure of the gas.

According to the second aspect of the present invention, it is possible to reliably prevent the gas from being ejected depending on the material of the fire extinguishing agent and the injection state.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the fire extinguishing system at a gas construction site described above, the fire extinguishing agent is a two-component foamed resin composed of a main agent and a solidifying agent, and is pumped by an inert gas and mixed immediately before injection to form a gel from a creamy to a gel. It is characterized in that it is sprayed in a solidified state, adheres to the inside of the pipe end and around the pipe end, and solidifies while thermally foaming.

According to the third aspect of the present invention, since the two-component base agent and the solidifying agent which are pumped by the inert gas are mixed immediately before the injection, the injection is prevented without being solidified in the process of the pumping. There is no.

According to the third aspect of the present invention, since the solidification is performed at the place where the fire occurs, it is possible to effectively realize the temporary extinguishing of the fire at the fire site and the prevention of gas ejection. Can be.

According to a fourth aspect of the present invention, there is provided a shut-off device for use in the fire extinguishing system according to any one of the first to third aspects, wherein a cylinder for individually storing the main agent and the solidifying agent is provided. The fire extinguisher includes a pressure cylinder that applies an injection pressure to the cylinder, and an injection member that communicates with a pipe that is individually drawn from the cylinder containing the main agent and the solidifying agent. It is characterized in that it has a portable structure that can be carried on a state in which the cylinders are mounted together.

According to the fourth aspect of the invention, a cylinder containing the main agent and the solidifying agent individually, a pressure cylinder for applying an injection pressure to the main agent and the solidifying agent, and an injection member are collectively formed into a portable structure. Since the fire extinguishing system is composed of a fire extinguisher, the fire extinguishing system only needs to transport the fire extinguisher to the fire site, and the fire extinguishing system and the gas injection preventing system can be taken quickly.

According to a fifth aspect of the present invention, in the shut-off device according to the fourth aspect, the cylinders containing the main agent and the solidifying agent communicate with each other and are connected to the pipe connected to the pressure cylinder. Separately, a part of the extension direction is immersed in the main agent and the solidifying agent, and the other part in the extension direction has a pipe connected to the ejection member, and has a siphon structure, and the pressure cylinder and the ejection member are provided with a pressure adjusting member. It is characterized by having.

According to the fifth aspect of the present invention, the siphon structure can discharge the main agent and the solidifying agent toward the injection member by applying the pressure from the pressure cylinder to the cylinder containing the main agent and the solidifying agent. Therefore, the main agent and the solidifying agent are mixed in the same amount under the same pressure, and the mixing ratio at the time of injection can be stabilized.

According to the fifth aspect of the present invention, since a stable mixing ratio is set, gelation can be stably obtained from a creamy state in which a good jetting state can be obtained, and early solidification at a fire site is stable. As a result, it is possible to efficiently extinguish the fire as well as to prevent gas emission.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an explanatory view showing a disaster prevention method at a gas pipe construction site according to one embodiment of the present invention. The figure shows excavation shaft A formed on one side of the construction section
The surrounding construction site is shown. 1 is a gas pipeline, 2a, 2
b is a saddle for mounting a bypass pipe provided for a small-diameter pipe of 80 A or less, 3 is a cock, 4 is a bypass vertical pipe, and a gas pipe 1 is an insertion hole of a bag as a gas shutoff member. 1a is drilled, and this insertion hole 1a
, Bags 7 and 7 are inserted. In this gas pipe construction site, there is a danger that gas leaking from the insertion hole 1a through the bag 7 will ignite and cause a gas fire. If the gas leaked from the insertion hole 1a is ignited and a fire occurs, the fire is extinguished and the gas is prevented from being blown out by the shutoff device having the configuration shown in FIG.

FIG. 2 is a schematic view showing the principle configuration of the shut-off device. In FIG. 2, a shut-off device 10 includes a main agent cylinder 11 and a solidifying agent cylinder 12 containing a main agent and a solidifying agent, respectively. It is provided at an end of hoses 14 and 14 ′ connected to a pressure cylinder 13 containing nitrogen (N) for giving an injection pressure to the cylinder, and a main agent cylinder 11 and a solidifying agent cylinder 12, respectively. The fire extinguisher includes an injection nozzle 15 serving as an injection member. The main agent cylinder 11 and the solidifying agent cylinder 12 communicate with each other via a pipe 16.
A pressure pipe 17 extending from the pressure cylinder 13 is connected. The pipe 16 communicates with the internal space of the main agent cylinder 11 and the solidifying agent cylinder 12.
In the solidifying agent cylinder 12, one end of the hose 14, 14 'in the extending direction is immersed in the main agent and the solidifying agent. Thereby, the main agent cylinder 11 and the solidifying agent cylinder 12
The siphon structure is such that when the internal pressure is increased by the introduction of an inert gas from the pressure cylinder 13, the main agent and the solidifying agent are extruded, respectively. Although not shown, the injection nozzle 15 is provided with a static mixer or an orifice structure therein so that the main agent and the solidifying agent introduced via the pipes 14 and 14 'can be mixed and injected.

The main agent and the solidifying agent are made of a resin which has a property of being flame-retardant and having a viscosity by being mixed, having a property of being gelled from a creamy state and capable of being jetted, and capable of being solidified while being thermally foamed. A phenolic resin is used as a main agent, and an isocyanate resin is used as a solidifying agent. In addition, it is also possible to mix a foaming agent for promoting foaming in addition to the main agent and the solidifying agent.
In this embodiment, the characteristics shown in FIG. 3 are set for the base agent and the solidifying agent.

The fire extinguisher constituting the shut-off device 10 has a configuration in which the cylinders 11, 12, and 13 are mounted on a gantry 18, and the gantry 18 is provided with a shoulder belt 18A as shown in FIG. Can be carried on the back.

The pipe 1 connected to the pressure cylinder 13
7 is provided with a pressure reducing valve 17A, and the injection nozzle 15 is provided with an opening / closing valve 15A capable of narrowing the flow path, so that the injection pressure and the injection amount can be adjusted. Although not shown, a pressure gauge is connected to the pipe 17 connected to the pressure cylinder 13 so that the supply pressure from the pressure cylinder 13 can be adjusted. In this embodiment, the pressure in the pressure cylinder 13 is 15 to 2
The pressure is set to 0 MPa, and the pressure applied to the main agent cylinder 11 and the solidifying agent cylinder 12 is about 0.9 MPa, preferably 1.
It is set to 0 MPa, and the injection amount from the injection nozzle 15 is set so as to obtain about 100 l / min when the injection distance is 6 to 7 m. This value has been determined from experiments by the inventors, and it has been confirmed that the digestive agent solidifies within a few seconds after injection.

The fire extinguishing using the shut-off device 10 having the above configuration is executed in the following procedure. In FIG. 1, when a fire occurs at the bag insertion hole 1a of the gas pipe 1 or at the pipe end,
A worker carries the shut-off device 10 to take a fire extinguishing posture at a fire site. When the operator confirms the pressure from the pressure cylinder 13 and the state of the injection from the injection nozzle 15, the injection nozzle 15 is opened, and the digestive agent composed of the main agent and the solidifying agent is injected. The digestive agent is sprayed toward the inside of the tube end or toward the periphery of the tube end including the vicinity of the insertion hole 1a.

The main agent and the solidifying agent discharged from the main agent cylinder 11 and the solidifying agent cylinder 12 by the pressure from the pressure cylinder 13 are mixed only when they reach the injection nozzle 15. The mixed main agent and solidifying agent are sprayed in a state of gel from a creamy state, reach the inside of the pipe end or the vicinity of the insertion hole 1a, contact with the flame, and increase in temperature, and solidify while foaming. When the injection is performed continuously, a new fire extinguishing agent is piled up on the solidified fire extinguishing agent inside or around the pipe end and solidifies. As a result, the solidified fire extinguishing agent is in a state of being piled up in layers, so that the gas flow can be blocked inside the pipe end against the external gas pressure, and the gas pressure can also be reduced around the pipe end. A digestive agent is superposed in opposition. As a result, the ejection of gas from the tube end or the insertion hole 1a at the periphery of the tube end is suppressed, so that the ejection of combustible gas is cut off, thereby eliminating the cause of ignition and extinguishing the gas. Spouting can also be prevented.

In this embodiment, of the combustion conditions, the presence of combustibles, the presence of oxygen, and the combustible temperature, the presence of the combustibles is eliminated to extinguish the fire. When water or foam is used, As described above, it is possible to extinguish a fire without aggressively lowering the combustible temperature or shutting off oxygen. As a result, there is almost no problem that occurs when water is used.

The shut-off device 10 according to the present embodiment can be injected as a viscous fire extinguishing agent by mixing a main agent and a solidifying agent. It can also be used for sealing or sealing the outer peripheral surface of a pipeline. For example, in the case of sealing a leak point for a water pipe instead of a gas pipe, the surrounding area of the leak point is covered with vinyl or the like to form a filling space for a digestive agent, and the space is filled with a digestive agent. This makes it possible to adhere the solidified digestive agent at the periphery of the leaked part. As a place where such a sealant can be used with a digestive agent, for example, a joint part is also an object. In addition, when the digestive agent is used for purposes other than digestion, the form of the injection nozzle can be changed according to the application. In this case, the injection nozzle may be replaced.

[0030]

As described above, according to the present invention, it is possible to extinguish a fire, which is a temporary disaster, by injecting while mixing the main agent and the solidifying agent using the cylinder mounted on the subject. Also, the emission of gas after the extinguishment can be prevented by the extinguisher itself used for digestion. As a result, unlike in the case where water or foam is used, it is possible to quickly prepare the digestion equipment and to prevent gas spouting without any trouble in preparing the digestion equipment. Are not mixed, and do not cause adverse effects such as incomplete combustion.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a digestion system at a gas pipe construction site according to one embodiment of the present invention.

FIG. 2 is a piping diagram for explaining the principle configuration of a shutoff device used in a digestion system.

FIG. 3 is a table for explaining component characteristics of a main agent and a solidifying agent used in the digestion system shown in FIG.

FIG. 4 is a view for explaining a use state of the shut-off device shown in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gas pipeline 4 Bypass pipe 7 Bag 10 Shutoff device 11 Main agent cylinder 12 Solidifying agent cylinder 13 Pressure cylinder 14 Pipe for connecting main agent cylinder and injection nozzle 14 'Pipe for connecting solidifying agent cylinder and injection nozzle 15 With injection member A certain injection nozzle 16 A pipe connecting the injection cylinder and the solidifying agent cylinder 17 A pipe connecting the pressure cylinder to the main agent and the solidifying agent cylinder 18 A gantry 18A A shoulder belt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masumi Kobayashi 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Wataru Inoma 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Inside (72) Inventor Hideki Takahashi 1456, Hazama-cho, Hachioji-shi, Tokyo Inside Three Bond Co., Ltd.

Claims (5)

[Claims] 1. At a construction site where construction is performed while maintaining a state in which gas is flowing inside a pipe, a fire generated in the construction section is flame-retardant and is mixed with the fire to generate viscosity. By spraying a fire extinguishing agent containing a solidifiable foaming and solidifying agent, the inside of the pipe is sealed at least at the pipe end of the construction section, and the surrounding of the pipe end is prevented, thereby preventing gas flowing in the pipe from being blown out. A fire extinguishing system at a gas construction site, wherein the fire is extinguished. 2. The fire extinguishing system according to claim 1, wherein the fire extinguishing agent gels from a creamy state by mixing, solidifies when it reaches the end of the pipe after being sprayed, and has a solidified surface. A material that can seal the inside of the pipe against the pressure inside the pipe by stacking and solidifying the new fire extinguishing agent, and can be deposited around the pipe end and surround the circumference A fire extinguishing system at a gas construction site. 3. The fire extinguishing system according to claim 1, wherein the fire extinguishing agent is a two-component foamed resin comprising a main agent and a solidifying agent, and is fed by an inert gas under pressure and immediately before injection. A fire extinguishing system at a gas construction site, which is sprayed from a creamy state to a gelled state by being mixed into the pipe, adheres to the inside of the pipe end and around the pipe end, and solidifies while being thermally foamed. 4. A shut-off device used in the fire extinguishing system according to claim 1, wherein a cylinder containing the main agent and the solidifying agent individually, and an injection pressure for each of the cylinders. A fire extinguisher equipped with a pressure cylinder for imparting pressure, and an injection member communicating with a pipe individually drawn out of the cylinder containing the main agent and the solidifying agent, wherein the fire extinguishing apparatus collects the cylinders. A blocking device having a portable structure that can be carried on the back while mounted. 5. The shutoff device according to claim 4, wherein the cylinders containing the main agent and the solidifying agent communicate with each other and are connected to the pressure cylinder, and the pipes are separated from the main agent and the solidifying agent. And a pipe connected to the injection member at the other end in the extension direction to have a siphon structure, and the pressure cylinder and the injection member are provided with a pressure adjusting member. Blocking device.