JPS62247718A - Method for preventing fire spreading 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] [Field of Industrial Application] This invention is for preventing the spread of fire in so-called group cables, which are bundles of multiple power cables, f-talk cables, signal cables, coaxial cables, control cables, thermocouple cables, etc. Regarding the law.

[Conventional technology]

For example, in industrial complexes, cables play an important role in supplying power 12 and transmitting control signals. Particularly in recent years, with the progress of centralized control using computers, the number and number of control cables has increased, and they are strung out in every corner of industrial complexes.

Incidentally, these cables use an organic substance (for example, synthetic resin) as an insulating material or 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 it burns, it emits smoke and harmful gases.

As mentioned above, cable fires are extremely dangerous, but the danger level is even greater for so-called groups of cables bundled together than for a single cable.

This is often the case with cables. In other words, in the case of a single cable, only that cable will burn.

In the case of group cables, each cable is supplied with insulating material and sheathing material.
It also burns very well. Therefore, even if the individual cables are decombusted to some extent, the fire is strong and cannot be extinguished easily. Group cables are extremely dangerous in the event of a fire, as described above, and can cause damage over a wide area. 1 Even with the sound of a normal carbon dioxide fire extinguisher, the fire cannot be extinguished.

In other words, the fire will only weaken if the fire extinguisher is activated, but
After that, the fire broke out and became more powerful. Therefore, Ganjin Toyama proposed a method for preventing the spread of fire in group cables by
78096 and JP-A-52-78097 have already been proposed.

[The problem that the invention attempts 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. Care must be taken to ensure that the holes are waterproof. In other words, if multiple cables are tied together in one tube and shaped like a single large cable, it is waterproof.
In the case of power cables and control cables, when multiple cables pass through through holes independently to avoid mutual interference, gaps are created at the contact points of the cables, and it is difficult to waterproof those areas. There's a tricky problem.

Problems with waterproofing due to these points lead to the water in the container being reduced due to evaporation, and the water in the container becomes exhausted over a long period of time, making it useless for preventing the spread of fire.

This invention aims to improve such conventional problems, and includes providing a box-shaped body at a predetermined position in the longitudinal direction of the group cable, so that a part of the longitudinal direction of the cable passes through the box-shaped body. Along with doing so.

A cylinder is provided on the top of the box-like body, a blast tube is connected to the top of the cylinder, a cutter is attached to the tip of the piston of the cylinder, and the cutter is held in the holder with the piston of the cylinder pushed into the cylinder. In the event of a cable fire, the gunpowder in the blast tube at the top of the cylinder will spontaneously ignite and explode due to the heat from the fire.[2. By forcefully pushing the piston downward with the blast wave, a blade attached to the tip of the piston cuts the holder and cable, and at the same time the blade shields the space between the cables to prevent the spread of fire.

[Means to solve all problems]

A box-shaped body made of non-combustible material is provided in a part of the longitudinal direction of the cable, so that all the cables pass through the box-shaped body, and a cylinder is installed at the top of the box-shaped body, and an explosive is installed at the top of the cylinder. Connect all the pipes and attach a cutter to the tip of the piston of the above cylinder.

With the piston of the cylinder pushed into the cylinder, the blade is held in a box-like body by a holder, and in the event of a cable fire, the gunpowder in the blast tube at the top of the cylinder will spontaneously ignite due to the heat of the fire and explode. By forcefully pushing the piston downward with the blast wave.

A cutter attached to the tip of the piston cuts the holder and the cable, and at the same time the cutter shields the space between the cables to prevent the spread of fire.

[For production]

The explosion tube at the top of the cylinder exploded [7] A Western-style knife attached to the tip of the cylinder piston was pushed out and cut the cable.
to prevent the spread of fire.

[Embodiment] FIG. 1 is a perspective view showing the present invention, FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B--B in FIG. In the figure, (1) is a group cable consisting of various cables C1 to Cn, +211d is a box-shaped body made of non-combustible material, (3) is a cylinder attached to the top of the box-shaped body (2), and is a cylinder with +3+a. (3) Piston.

(4) is a metal blade attached to the tip of the piston (3) a of the cylinder (3), and (5) is a holder that holds the blade (4) in its entirety.

(6) is a blast tube connected to the top of the cylinder (3);
(7) This is the gunpowder contained in the above explosive tube (61).In the above configuration, if a cable fire occurs.

Due to the heat of the fire, the gunpowder (7) in the blast tube (6) at the top of the cylinder spontaneously ignited and exploded, and the blast force pushed the piston (3) a k downward forcefully, causing the piston (3) a
The blade (41) attached to the tip of the holder (5)
and cut the cable (1) [~, shield the space between the cables (1) with a knife (4) to prevent the spread of fire.

〔Effect of the invention〕

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

[Brief explanation of drawings]

1, 2, 3, 4, and 5 are diagrams showing embodiments of the present invention, in which (1) is a group cable, (2) is a box-shaped body, and (3) is a group cable. is the cylinder, (3+a is the piston, (4) is the knife, (5) is the holder, (6) is the explosive tube. (7) is the gunpowder. In the figure, the same or equivalent parts are given the same reference numerals. This is an indication.

Claims (1)

[Claims] A box-shaped body is provided at a predetermined position in the longitudinal direction of a group cable made up of a plurality of cables, so that a part of the longitudinal direction of the cable passes through the box-shaped body, and the box-shaped body A cylinder is provided at the top, a blast tube is connected to the top of the cylinder, a cutter is attached to the tip of the piston of the cylinder, and the cutter is held in a box-shaped body by a holder with the piston of the cylinder pushed into the cylinder. In the event of a cable fire, the gunpowder in the blast tube at the top of the cylinder will spontaneously ignite and explode due to the heat from the fire, and the blast force will force the piston downward, allowing the blade attached to the tip of the piston to fire. A method for preventing the spread of fire in group cables, in which the holding body and cables are cut, and at the same time the space between the cables is shielded with a knife to prevent the spread of fire.