JPS61210816A - Prevention for fire expansion of group cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial field of application] Fire spread of so-called group cables made of multiple bundles of Komei and lightning cables, control cables - snowy cables, signal cables, coaxial cables, thermocouple couples, etc. It concerns the Prevention Act.

[Conventional technology]

For example, in industrial complexes, cables play an important role in supplying power and transmitting control signals. Particularly in recent years, with the progress of centralized control using computers, the number and types of control cables have increased.
Every corner of the industrial complex is covered with 9-walls.

Incidentally, these cables use insulation as an insulating material or an organic material (eg, synthetic resin) as an exterior material. Organic materials are sensitive to heat and burn easily, so there is a risk that a fire will spread along the cable. Moreover, when burned, it emits smoke and harmful gases.

Cable fires are extremely dangerous as described above, but the danger level is higher in so-called group cables, which are made by bundling multiple cables, than in the case of a single cable.

In other words, in the case of a single cable, only that cable will catch fire, but in the case of group cables, each cable replenishes each other with insulating material and sheathing material, even if it ignites on its own. , it burns very well even if it catches fire from something else and starts to catch fire. Therefore, the firepower is strong even if each individual cable is made flame retardant to some extent.

Do not extinguish the fire easily. As mentioned above, group cables are extremely dangerous in the event of a fire, and there is a risk that damage may be spread over a wide area.1) Even with a normal carbon dioxide fire extinguisher, the fire cannot be completely extinguished.

In other words, the fire will only weaken if the fire extinguisher is activated, but
After that, the fire intensified again. Therefore, Ganjin Toyama proposed a method for preventing the spread of fire in group cables.
The invention of this application is related to the above-mentioned Japanese Patent Application Laid-Open No. 52-78096, which has already been proposed in Japanese Patent Laid-Open No. 78096 and Japanese Patent Laid-Open No. 52-78097.

[Problems that the invention helps solve]

The method described in JP-A-52-78096 prevents the spread of fire by passing the group cable through a container filled with water. It is necessary to pay considerable attention to the waterproofing of the through-hole portion.Furthermore, since water tends to evaporate or leak, the water in the container will run out over a long period of time and will not be useful in preventing the spread of fire. Therefore, it is necessary to check that the specified amount of water is being secured, and to replenish water if it is insufficient, at a relatively high frequency. Furthermore, the method of using water to prevent the spread of fire required careful attention to safety concerns such as electrical leakage and electric shock, which was rare.

This invention aims to improve these conventional problems.In the event that a group cable burns, sand is used instead of water to extinguish the fire in order to weaken the flame, slow the burning rate, and eventually extinguish the fire. It was designed to prevent the spread of fire by passing a Nakahegel loop cable through it. In another example, group cables are bent into loops to prevent the spread of fire.

[Means to solve all problems]

To prevent the spread of fire to the group cables, a portion of the group cables was passed through a box-shaped body filled with sand.

In another example, a part of the group cable was turned in a loop in the direction of gravity.

[Effect]

In order to prevent the spread of fire to the group cables, the group cables are passed through a box-shaped body, and the sand packed inside the box reduces the amount of air in some areas, completely annihilating the amount of oxygen, making combustion difficult, and the sand itself It acts as a refrigerant to lower the temperature of the combustion part.

In addition, by filling with smooth sand, the gap created by the combustion of organic materials (such as synthetic resins) used as insulating materials or exterior materials is immediately filled, making it possible to further enhance the fire extinguishing effect.

Also, when the group cable burns, it burns in the gravity direction (i.e., downward direction) rather than in the anti-gravity direction (i.e., upward direction). Regret 4!
4IrII + fusion wyM −jk L ye L % −
Gll T; Ia l Jf Turn the u-p cable into a loop and wire it, and use it in combination with the above fire extinguisher (in some cases, a single method or a combined method t - including repeated installation of several sets) ) By doing so, you will have more time to take firefighting measures and achieve your ultimate goal of extinguishing the fire.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which (l) is a group cable consisting of various cables C1 to Cn, (
2) is a box-shaped container provided in a part of the group cable in the longitudinal direction, and sand (3) is placed in the container. The shape of this container (2) is a box.

It can be made into any shape such as tubular or bag shape.

In this more configuration, the group cables (
1) spreads to the sand (3) part of the container (2), the flame is blocked by the sand (31), and the fire intensity is weakened by the decrease in air volume and the cooling effect of the sand itself, causing the fire to spread. The smaller the force progresses over time, the easier it is to take fire extinguishing measures.Also, the degree of fire force F1 + 1) -? This is another embodiment of the invention of 911S, and the fire spread prevention effect itself is the same.
The difference is that the group cable (1) is turned into a loop.

In other words, in Figure 2, the group cable (11) is turned into a loop shape, and the container (2) containing the sand (3) is designed so that even if the fire spreads from either the left or right direction, only one small container is needed. be.

〔Effect of the invention〕

Since this invention is as described above, the group
Figures 1 and 2 can prevent the spread of fire in the cable.
What is shown in the figure is only a few embodiments of the invention.
Needless to say, there are various modifications.

4. Brief Description of the Figures Figure 1 is a diagram showing one embodiment according to the present invention, and Figure 2 is a diagram showing another embodiment. (1) is a group cable;
(2) shows the container, and (3) shows the sand.

Note that the same or corresponding parts in FIG. 9 are designated by the same reference numerals.

Claims (2)

[Claims] (1) A box-shaped body is provided at a predetermined position in the longitudinal direction of the group cable, which is a bundle of multiple cables, so that a part of the cable in the longitudinal direction passes through the box-shaped body, and the box A method to prevent the spread of fire in group cables by placing sand inside the cable so that part of the cable is covered with sand. (2) Group cables made by bundling multiple cables. Turn a predetermined position in the longitudinal direction of the cable into a loop shape, and position the turned part in the sand inside the box-shaped body containing sand. A method to prevent the spread of fire in group cables by leaving them in place.