JPS60136687A - Structure of cable penetrating section - 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] [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. 0 [Technical background] 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 - conventionally, the Usually, the structure is as shown in Fig. 2.0 Fig. 1 shows the case of penetrating the floor 1, and Fig. 2 shows the case of penetrating the wall 11. Alternatively, fire-resistant and heat-insulating partition plates 4.14, such as asbestos silicified calcium plates and asbestos pearlite plates, are installed in contact with and fixed to the top and bottom or front and back of the frame of the wall 11, and this space is filled with rock wool, glass wool, etc. [Problems with the prior art] However, such conventional The structure has the following drawbacks:

■ Because the work is done from above and below the floor 1 or from the front and back of the wall 11, there is a lot of work area for workers to walk on, etc. All of the work is on-site construction type, so the work process is many and takes a long time. In the penetration part 1, construction is difficult because the lower part is a ceiling work, and it is at a high place. Also, if the workability is poor like this, it is difficult to uniformly fill the fire-resistant insulation material 30. Rock wool is often used as a fire-resistant heat insulating material 3, 13 due to its properties such as fire resistance and heat insulation, as well as its economic efficiency, but it scatters a lot during work and requires difficult post-treatment0. Performance is limited by floor and wall thickness 0 Also, it is very difficult to maintain the packing density of rock wool which affects fire resistance performance O ■ Reuse when adding or changing cables i = Not possible 0 For example: , Cables are added or changed for periodic inspections at power plants, but the conventional cable penetration structure makes reuse impossible. The present invention solves the above-mentioned problems, and the gist of the present invention is to divide cables, etc. at the cable penetration part so that they can be encircled and brought into contact with each other. The cable is characterized in that at least one stage of the prefabricated fireproof insulator, which has a metal box shape and is filled with fireproof insulating fiber and lined with a fireproof insulating material, is provided in the cable penetration part. 0 [Example] Hereinafter, the present invention will be described in detail with respect to the example shown in FIGS. 3 to 7.

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 an iron cover of the tray 23; 25 is a box-shaped prefabricated fireproof insulating body provided in the cable penetration portion; the pushhub type fireproof insulator 25 is fixed to the floor 21 by anchor bolting through a channel 31; This is to protect the cable from fire by blocking the cable penetration part, and at the same time to prevent the spread of fire to the cable.As shown in Figure 5, it is made of asbestos calcium silicate board, asbestos pearlite board, etc.
It is a metal box-shaped body lined with about 50 shells of fireproof insulation material 26, and the inside is covered with a fireproof insulation insulation material 28 such as rock wool, fireproof putty material, organic or inorganic foam material, etc. Usually, a recess 30 is formed which becomes a through hole 29 through which the cable C passes when the cable C is divided into two parts and joined together. The metal lining of the fireproof insulation material is usually done with a heat-resistant adhesive.The metal used is steel such as iron or stainless steel, and the combination with the fireproof insulation material provides sufficient mechanical strength and fire resistance. Become something.

As a metal plate, one of 1 to 5 degrees is usually used.
Then, fireproof putty (for example, F7-B manufactured by Fujikura Electric Cable Co., Ltd.) is applied to the divided joint surfaces of the fireproof heat insulating body 25.
is applied and sealed.

Further, in the above embodiment, the prefabricated fireproof heat insulating body 25 is provided in two stages, but it may be more than two stages. 25. In 25, it is preferable if the positions of the split joints 32 are shifted from each other or are arranged so that they cross each other, since the penetration of flame and heat during a fire is longer and the fireproof insulation effect is increased. Fig. 3 shows an embodiment in which the positions of the split joints 32 are shifted from each other, and Fig. 6 shows an embodiment in which they are crossed. Step 3 as shown in Figure 7 without
If set to 3, the same effect as described above is obtained.In addition, in the above embodiment,
This is a case where the pre-knob type fireproof insulation is divided into two parts, but it is not limited to this number of divisions, and may be divided into an appropriate number. It can be applied to all of these cases, including through a duct or directly, and can be applied not only to floors but also to cable penetrations in walls. In addition, gaps such as the contact surfaces between trays, ducts, or cables and the fireproof heat insulator 25 are also filled with fireproof material to improve fireproof heat insulation properties.

[Effects of the present invention]

According to the present invention, the fireproof cable penetration can be completed simply by attaching a prefabricated fireproof insulator that has been divided and created in advance to one side (one side) of the cable penetration, such as on the floor or wall of a building. Because it can be formed, the following effects can be expected ○ ■ It is easy to work, and it is sufficient to work on only one side (one side) such as the floor or wall, so it is easy to work and can save a lot of time on site. It can be shortened and the work area is narrow, so it can reduce the danger of work at power plants, etc. Particularly in the case of floor penetrations, there is no need to work at heights 0 ■ It eliminates the need for filling fire-resistant insulation materials that involve scattering of rock wool etc. 0 ■ Since it is a pre/build type, the structure, properties, etc. are uniform. It is possible to obtain penetrations with the desired fire resistance properties without being restricted by floor or wall thickness.Standardization allows mass production and reduces costs.

■ There is no strength problem, so it is possible to work on the penetration part0. Even if construction work such as adding or changing cables is done, the fireproof insulation can be reused0. Furthermore, the present invention However, without being limited to the above-mentioned aspects,
This can be used as a basis for various applications wherever fireproof insulation can be used. The term "box-shaped" can also be applied to any prismatic shape such as a rectangular parallelepiped, cube, cylinder, hexagonal prism, etc., depending on the shape of the cable penetration part.As described above, the structure of the cable penetration part according to the present invention is This is superior compared to conventional products.

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views showing a conventional example, Figures 3 to 7 show an embodiment of the present invention, Figure 3 is a perspective view, and Figure 4 is a perspective view.
The figure is a sectional view, and Figure 5 is a perspective view of a prefabricated fireproof insulation body.
FIG. 6 is a perspective view showing another embodiment, and FIG. 7 is a perspective view of another fireproof insulator. 0C... Cable 21... Building floor 22... Cable penetration part 25...・Box-shaped prefabricated fireproof insulation material 26...Fireproof heat insulation material 28...Fireproof heat insulation light beam material 30...Concave portion Patent applicant: Toshiba Flint Construction Co., Ltd. Patent applicant: Fujikura Electric Cable Co., Ltd. Figure 1, Figure 2 Figure 4 Figure 24 Figure 5 9

Claims (1)

[Claims] (1) At the cable penetration part, the cable is divided so that it can be encircled and brought into contact with the cable. Structure 0 of a cable penetration part characterized in that at least one stage of a box-shaped prefabricated fireproof insulation body is provided in the cable penetration part. Structure 0 of the cable penetration part according to claim 1, characterized in that it is provided in multiple stages so as to