JPS62281712A - Method of preventing fire spread along group cables - 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] 2. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a so-called so-called bundle of a plurality of ring cables, telephone cables, signal cables, coaxial cables, control cables, thermocouple cables, etc. Regarding the method for preventing the spread of fire in group cables.

[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 sterilization using computers, the number and number of FTI control cables has increased, and they are being stretched to every corner of industrial complexes.

By the way, these cables are used as insulation materials.

Organic materials (such as synthetic resin) are used as exterior materials for lui.

Organic substances are sensitive to heat (because they themselves burn well.

There is a risk that the cables will overflow and the fire will spread.

Moreover, when burned, it emits smoke and harmful gases.

Cable fires are extremely dangerous as described above, but the risk 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 burn.

In the case of group cables, each cable replenishes insulating material and sheathing material to each other, and whether it catches fire on its own or catches fire from another cable and starts catching fire, it is extremely dangerous to burn. .

Therefore, even if each individual cable is made flame-retardant to some degree, the fire is strong and cannot be extinguished easily.

In the event of a fire, group cables are extremely dangerous and can cause widespread damage, and the fire cannot be extinguished using an ordinary carbon dioxide fire extinguisher. In other words, the fire weakens only when the fire extinguisher is activated, but then it becomes stronger again.

Therefore, the applicant has proposed a method for preventing the spread of fire in group cables, instead of the methods shown in JP-A-52-78096 and JP-A-52-7809.

The invention of this application is related to the above-mentioned Japanese Patent Application Laid-Open No. 52-78096.

[Problem that the invention seeks to solve]

The method described in JP-A-52-78096 prevents the spread of fire by passing the group cable through a container containing water. It is necessary to pay considerable attention to waterproofing.

In other words, it is easier to waterproof if multiple cables are grouped together in one tube to form one large cable, but it is easier to waterproof power cables, power cables, control cables, etc.
In the case of cables, when multiple cables pass through the through hole independently to avoid mutual interference,
Air gaps are created at the contact points between the cables, and waterproofing these areas is a rather troublesome problem.

Problems with waterproofing due to these points lead to a decrease in the amount of water in the container, and over a long period of time the water in the container runs out, making it useless in preventing the spread of fire.

This invention aims to improve these conventional problems, and includes a hole in the diametrical center of a group cable made of a bundle of multiple cables, which is made of a noncombustible material and through which powder is ejected in one circumferential direction. A tube with holes formed at a predetermined interval and sealed at one end is embedded, and an air compressor is installed to send compressed air into the tube, and an air compressor is provided at a predetermined interval over the length of the tube. A fire suppressor is connected to the fire detector and sends a signal to send a compressed air hazard from an air compressor to the above pipe, and baking soda powder is placed in the pipe, so that in the event of a cable fire, the signal detected by the fire detector will be activated. is transmitted to the control device, and the control device issues an ill H signal that activates the air compressor, thereby sending compressed air to the tube, which is then pumped into the tube from the center of the cable using air pressure. Baking soda powder is sprayed radially from the holes provided in the tube to prevent the spread of fire.

[Means for solving problems]

Holes made of a noncombustible material and through which powder is ejected in the circumferential direction are provided at predetermined intervals in the diametrical center of a group cable made up of a bundle of multiple cables.

In addition to implanting a tube that is sealed at one end.

An air compressor that sends compressed air to the above pipe.

It is connected to fire detectors installed at predetermined intervals along the longitudinal direction of the pipe, and a control device is installed to send a control signal to send compressed air from an air compressor to the pipe, and baking soda is installed inside the pipe. In the event of a cable fire, the signal detected by the fire detector is transmitted to the controller, which sends a control signal to operate the air compressor, which sends compressed air to the tube. The baking soda powder, which had been put into the tube from the center of the cable using air pressure, is ejected radially from the holes in the tube to prevent the spread of fire.

[Effect]

The baking soda powder embedded in the center of the cable and contained in the tube is radially ejected from the center of the cable through the hole in the tube by the air pressure of the compressed air sent by the air compressor, and the cable Prevent the spread of fire by covering.

〔Example〕

FIG. 1 is a perspective view showing the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. In the figure, (1) is a group cable consisting of cables 01 to On for each ridge, (2) is a group cable made of non-combustible material, and holes 18) from which powder is ejected in the circumferential direction are provided at predetermined intervals. It is provided so as to be embedded in the diametrical center of the cable (1).

Note that an air compressor that sends compressed air (3) to this pipe (2), which will be described later, is connected to one end of the pipe (2).

The other end is sealed. (4) is the baking soda powder contained in the pipe (2), and (5) is the fire detector installed at predetermined intervals in the pipe (2), and these are controlled by one or more fire detectors. It is connected to the vessel (6).

(7) is connected to one end of the pipe (2), and is an air compressor that sends compressed air [3] to the pipe (2).The air compressor (7) is activated by the controller (610 control signal). Compressed air (3) is sent to the tube (2), and the baking soda powder (4) placed in the tube (2) is moved from the center of the group cable (1+) by air pressure to the tube as shown in Figure 3. It ejects radially from the holes (8) in (2) to prevent the spread of fire.

〔Effect of the invention〕

Since this invention is configured as described above, it is possible to prevent the spread of fire in the group cable.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are diagrams showing an embodiment according to the present invention, in which (1) is a group cable, f2jil-
(3) is compressed air, (4) is baking soda powder, (5) is a fire detector, (6) is a controller, (7) is an air compressor, and (8) is a hole. In FIG. 9, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] A group cable made of a bundle of multiple cables has holes made of a noncombustible material at predetermined intervals in the diametrical center of the cable, through which powder is ejected in the circumferential direction, and one end is sealed. The pipe is connected to an air compressor and fire detectors installed at predetermined intervals along the length of the pipe, and a controller is installed to issue a control signal to send compressed air from the air compressor to the pipe. Furthermore, baking soda powder is placed inside the pipe, and in the event of a cable fire, the signal detected by the fire detector is transmitted to the controller.
Compressed air is sent to the pipe by issuing a control signal from the controller to operate the air compressor,
A method for preventing the spread of fire in group cables, in which the baking soda powder contained in the tube is ejected radially from the center of the cable through holes provided in the tube using air pressure to prevent the spread of fire.