JPH0526408B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a cable penetration system in which a cable passes through the framework of a building such as a power plant or other general plant, such as a wall or floor, through a tray, a duct, or directly. Regarding the structure of the department.

[Technical background]

Conventionally, when cables pass through the framework of buildings such as power plants and other general plants, such as walls and floors, via trays or ducts, or directly,
Usually, the structure is as shown in the figure. FIG. 1 shows the case of penetrating the floor 1, and FIG. 2 shows the case of penetrating the wall 11.
Fire-resistant and heat-insulating partition plates 4 and 14, such as asbestos calcium silicate boards and asbestos perlite boards, are installed in contact with and fixed to the top and bottom or front and back of the frame, and fire-resistant heat-insulating materials such as rock wool and glass wool are installed in this space. 3, 13, and then fill the gaps with cable C, tray, and duct with fireproof putty material 5, 15.
It is a sealing method.

[Problems with conventional technology]

However, such a conventional structure has the following drawbacks.

Since the work is carried out from above and below the floor 1 or from the front and back of the wall 11, there are many pedestrian work areas for the workers, and since everything is of the on-site construction type, there are many work steps and it takes a long time.

In particular, construction is difficult at the penetration part of the floor 1 because the lower part is a ceiling work, and it is a high place, and if the construction is difficult, it is also difficult to uniformly fill the fire-resistant insulation material 3. Become.

Rock wool is often used as fire-resistant heat insulating materials 3 and 13 due to its properties such as fire resistance and heat insulation, as well as its economic efficiency, but it is prone to scattering during work.
Post-processing is difficult.

Fire resistance performance is limited by floor and wall thickness. Also, it is very difficult to maintain the packing density of rock wool, which affects fire resistance.

Cannot be reused when adding or changing cables. For example, at power plants, cables are added or changed for periodic inspections, but the conventional cable penetration structure makes reuse impossible.

Since the strength of the partition plates 4 and 14 is weak, there is a problem in workability on the partition plates 4 and 14.

[Means for solving problems]

The present invention solves the above-mentioned problems, and the gist thereof is that the cable penetration part is divided into parts so that the cable, etc. can be surrounded and brought into contact with each other, and the inside is filled with a fire-resistant and heat-insulating filler. The present invention is characterized in that a prefabricated metal box-shaped fireproof heat insulating body lined with a fireproof heat insulating material is provided in the cable penetration part.

In the unlikely event that a fire breaks out in a cable and spreads, the cable penetration section will be affected by considerable heat, but the heat will not be uniform throughout, but will be concentrated on the cable duct side. Therefore, even if you use a simple metal box and fill it with fireproof material, the metal box will thermally deform and create a gap between it and the cable duct, and air will enter through this gap, increasing the fire's intensity. The desired results cannot be obtained as the result is increased.
However, in the present invention, since the metal box is lined with (closely adhered to) a fireproof heat insulating material, thermal deformation is difficult to occur, the above-mentioned problems are not caused, and the metal box is effective in preventing the spread of fire.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 3 to 6.

In FIGS. 3 and 4, 21 is the floor of the building, 22 is the cable penetration part, C is the cable in the penetration part 22 of the floor 21, 23 is a ladder-type tray that supports the cable C, and 24 is the tray 23. The iron cover 25 is a box-shaped prefabricated fireproof heat insulating body provided at the cable penetration part, and is fixed to the floor 21 by anchor bolts with a channel 31.

The prefabricated fireproof heat insulator 25 closes the cable penetration part to protect the cable from fire and at the same time prevents the spread of fire to the cable, and as shown in FIG. 5, it is made of asbestos calcium silicate board, asbestos perlite board, etc. It is a metal box-shaped body lined with a fireproof insulation material 26 with a thickness of usually about 5 to 50 mm, and inside it is a fireproof insulation filling material such as rock wool, fireproof putty, organic or inorganic foam material, etc. 28
It is usually divided into two parts, and when they are joined and integrated, there is a through hole 29 through which the cable C passes.
A recess 30 is formed. The metal lining of the refractory insulation is usually done with a heat resistant adhesive. Further, as the metal, steel such as iron or stainless steel is used, and in combination with the fireproof heat insulating material, sufficient mechanical strength and fire resistance can be obtained. The metal plate used is usually one with a thickness of about 1 to 5 mm. Then, fireproof putty (for example, F-Seal B
Fujikura Electric Cable Co., Ltd.) is applied and sealed. In addition, the divided joint surface of the fireproof heat insulating body 25 is
The same effect as described above can be obtained by forming a stepped shape 33 as shown in FIG. 6 instead of making it straight as shown in the figure.

Although the above embodiment is a case in which the prefabricated fireproof insulation body is divided into two parts, the number of divisions is not limited to this, and it may be divided into an appropriate number. This is the case where the cable penetrates through the tray 23, but there are also cases where it passes through a duct or directly, and it can be applied to all of these, and it can be applied not only to the floor but also to the cable penetration part of the wall. It is applicable.

Furthermore, fire-resistant putty is filled in the gaps between the contact surfaces between the tray, duct, or cable and the fire-resistant heat insulator 25, and also in the gaps between the cables when the tray is not in use, to provide fire-resistant heat insulation. Improvements are also made.

[Effects of the present invention] As described above, according to the present invention, a prefabricated fireproof insulation body that has been divided and created in advance can be installed on one side (one side) of a cable penetration part such as the floor or wall of a building. Since a fire protection cable penetration section can be formed, the following effects can be expected.

Easy to work with, one side (one side) of the floor, wall, etc.
Since it is sufficiently effective when working only with a chisel, it is easy to work and can greatly shorten on-site work time, and the work area can be narrow, so it can reduce the risk of work at power plants, etc. In particular, there is no need to work at heights at floor penetrations.

This eliminates the need for filling fireproof insulation materials that involve scattering of rock wool and other materials.

Since it is a prefabricated type, it is possible to obtain a uniform structure, properties, etc., and it is possible to obtain a penetration part with desired fire resistance properties without being restricted by floor thickness or wall thickness.

By standardization, mass production is possible and costs can be reduced.

Since there is no problem in terms of strength, it is also possible to work on the penetration part.

Even if construction work such as adding or changing cables is done, the fireproof insulation can be reused.

It should be noted that the present invention is not limited to the embodiments described above, but can be applied in various ways as long as a fireproof heat insulator can be used. Furthermore, the term "box-like" can also be applied to all prismatic shapes such as rectangular parallelepipeds, cubes, cylinders, and hexagonal columns, depending on the shape of the penetrating portion.

As described above, the structure of the cable penetration part according to the present invention is superior to the conventional structure.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional example, 3 to 6 show an embodiment of the present invention, 3 is a perspective view, 4 is a sectional view, and 5 is a sectional view of a conventional example. FIG. 6 is a perspective view of a prefabricated refractory insulation. FIG. 6 is a perspective view of another refractory insulation. C...Cable, 21...Building floor, 22...
... Cable penetration part, 25 ... Box-shaped prefabricated fireproof insulation material, 26 ... Fireproof insulation material, 28 ... Fireproof insulation filling material, 30 ... Recessed part.

Claims (1)

[Claims] 1 At the cable penetration part, there is a metal box-shaped box that is divided so that the cable, etc. can be encircled and brought into contact with each other, and the inside is filled with fire-resistant and heat-insulating material, and is lined with fire-resistant heat-insulating material. A structure of a cable penetration part, characterized in that a prefabricated fireproof heat insulator having a prefabricated fireproof insulation body is provided in the cable penetration part.