JPH0229768Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an improvement of a cable penetration part for the purpose of fireproofing a cable penetrating a floor surface. Conventionally, as shown in FIG. 1, this type of cable penetration part is made by passing a cable 3 through a cable penetration hole 2 provided in a floor surface 1, and filling the penetration hole with a fire-resistant filler 4 such as rock wool. A fireproof fireproof plate 5 made of calcium silicate or the like is provided on the upper and lower surfaces to seal it, and the plate is fixed to the floor with anchor bolts 6, and Danseal P (Furukawa Electric Co., Ltd.) is installed between the upper and lower surfaces of the plate and the cable, respectively. A putty-like fireproof sealing material 7 such as the product name (trade name) is heaped up and filled. With this structure, construction is performed separately on the upper and lower surfaces of the floor, requiring a large number of man-hours and complicated work. Furthermore, the lower surface of the floor cannot be beautifully finished when the putty-like sealing filler 7 is applied, which impairs the appearance. Furthermore, the seal filler etc. peeled off or fell off the bottom surface of the floor, making it difficult to provide a sufficient fireproof seal. As an improvement to this, as shown in Fig. 2, an outer flange 9 was provided around the top of the cable through hole 2 provided in the floor 1, as shown in Fig. 3, and an inner flange 10 was provided around the bottom. A cable attachment frame 8 made of iron or the like that is higher than the floor thickness and has approximately the same diameter as the hole is installed, the cable 3 is passed through the frame, and a fireproof fireproof board 11 is attached to the bottom of the frame via the inner collar. A fireproof filler 4 such as rock wool is placed inside the frame, and a fireproof cover 12 is placed over the top of the frame to seal it.
Similar to the above, a putty-like sealing filler 7 is heaped up on the upper surface of the cover between the cable and the cable for sealing. Note that the sealing filler 7 is also raised on the fireproof fireproof plate 11 between it and the cable 3 to sufficiently seal the cable. This structure is advantageous because the work can be done on the upper surface of the floor, reducing the number of man-hours. However, in the event of a fire occurring in the cable, if the length of the fireproof treated portion is short, it is not possible to prevent the spread of fire within the cable through hole. Therefore, it is regulated to lengthen the fire protection time inside the cable through hole. for example
Considering that it is 2 hours according to the standard fire curve in JISA-1304, the relationship between the cross-sectional area of the cable conductor and the length of the fireproofed part is the first.
Estimated as shown in the table (back side temperature 260℃ or less)

[Table] However, in the construction method shown in Figure 1, the length of the fire prevention treatment section can be adjusted using only a putty-like sealing filler, but the length can be increased by mounding this filler higher. This is an extremely difficult task and does not allow for a clean finish. Furthermore, in the case of using the construction method shown in Fig. 2, the frame can be made larger, but the equipment costs for this increase. The present invention was developed as a result of intensive research in view of the current situation and the discovery of a cable penetration section that has a simple structure and can lengthen the fire protection treatment section to extend and delay the fire protection time. That is, in the present invention, in a cable penetration part formed by passing a plurality of cables through a cable penetration hole provided in the floor surface, a cable attachment frame is installed in the penetration hole, and the cable attachment frame is installed along the longitudinal direction of the cables.
A fireproof plate is provided on one side of the hole through the frame and projects upward from the lower end of the through hole, and on the other side, a putty-like fireproof filler is filled between the top surface of the through hole and the cable to seal it. It is characterized by the fact that An example of the present invention will be explained in detail with reference to the drawings. A cable through hole 2 is provided in the floor 1 as shown in FIGS. 4 to 6, and an upper edge flange 9 and a lower edge flange 10 are previously provided in the through hole as shown in FIG. Install the frame body 8. Two types of cables 3, for example, 60 mmφ and 250 mmφ, are passed through the frame 8,
A fireproof fireproof plate 11 is attached to the lower surface of the frame through the inner flange.
A fireproof fireproof plate 1 is installed on one side of the cable along the length of the cable.
3 is provided to protrude from the upper part of the fireproof fireproof board 11 into the through hole, and the inside of the frame 8 is made of rock wool or room temperature vulcanization type (RTV).
Vulcanization) A fire-resistant filler 4 such as silicone foam is filled, and a fire-resistant cover 12 is attached to the top surface and tightened with bolts 6. Further, on the cable surface opposite to the fire-resistant fire spread fire prevention plate 13, a fire-resistant sealing material 7 is raised between the cover and the cable to form a fire-proofing treatment section, and the cable is sealed to form the present invention as shown in FIG. A cable penetration was obtained. In this case, as shown in Table 1 above, the length of the fireproof treatment section varies depending on the diameter of the cable, so for large diameter cables, the fireproof sealing material 7 is applied as shown in Figures 5 and 6. It increases the height. The reason why the fireproof fireproof plate 13 is provided in particular in this invention is that when the fireproof sealing material 7 is piled up on the circumferential surface of the cable, it can be piled up to a certain height, but when the height is higher than that, the adhesive strength The sealing material gradually slips off due to insufficient pressure. Therefore, it was not possible to provide a long fireproofing section as described above for a large diameter cable, and it was not possible to obtain a cable with sufficient fireproofing properties.
However, by installing a fireproof fireproof board as in the present invention, not only the adhesive strength between the cable and the fireproof sealing material but also the adhesive strength with the fireproof board increases, so even if the height of the fireproof sealing material is increased, the fireproof sealing material It is possible to obtain a fireproofing part that has a sufficient length without slipping. As detailed above, the present invention has remarkable effects such as easy workability, excellent fire protection, and low cost production.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic explanatory diagrams showing a conventional cable penetration part, Figure 3 is a perspective view of a cable attachment frame in a conventional cable penetration part, and Figures 4 to 7 are the cable penetration parts of the present invention. Fig. 4 is a plan view, and Fig. 5 is a plan view of Fig. 4.
A sectional view taken along line A', Figure 6 is a sectional view taken along line B-B' in Figure 4,
FIG. 7 is a perspective view. DESCRIPTION OF SYMBOLS 1... Floor, 2... Cable penetration hole, 3... Cable, 4... Fire-resistant filler, 5... Fire-resistant fire plate, 6... Bolt, 7... Fire-resistant sealing material, 8...
...Frame body, 9...Outer flange, 10...Inner flange, 1
1... Fireproof fireproof board, 12... Cover, 13... Fireproof fireproof board.

Claims (1)

[Scope of claim for utility model registration] (1) In a cable penetration part formed by passing multiple cables through a cable penetration hole provided in the floor,
A cable mounting frame is installed in the through hole, and a fireproof fireproof plate is provided on one side of the cable in the longitudinal direction of the cable so as to protrude upward from the lower end of the through hole through the frame. A cable penetration part characterized in that a putty-like fireproof filler is filled on the opposite side surface between the upper surface of the penetration hole and the cable to seal the space. (2) The cable penetration part according to claim 1 of the utility model registration, characterized in that an outer flange is provided on the upper edge and an inner flange is provided on the lower edge as a frame for attaching the cable.