JPH0223052Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a firewall structure for a cable tunnel.

Generally, fire walls in cable tunnels are
It can be roughly divided into the parts that make up the fire door, the cable passage section that is the issue here, and the other parts that make up the fireproof wall. In such a firewall, the most important part for fire prevention is the cable passage section. This is because a large number of cables made of flammable materials, such as plastic, are housed in the cable passing section, and therefore, fire is likely to spread through these cables. Furthermore, the cable passage section must have a structure that allows easy installation and removal for cable installation, removal, maintenance, and other work.

This invention was made in consideration of the above points, and is a fire prevention method for cable tunnels that can improve the fire protection performance of fire walls without significantly impairing the maintenance workability of cables in cable tunnels (caveways), etc. It provides a wall structure.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

First Embodiment (See FIGS. 1 and 2) This embodiment is an example in which a large number of large diameter cables 4A are supported on the fire wall 1. The fireproof wall 1 is constructed by filling the space between the fireproof wall main bodies 5A and 5B made of fiber boards etc., and the fireproof wall 1 is provided with a through window through which a large number of cables can be inserted. A plurality of plate-shaped reinforcing support members 2 arranged so as to extend in the left-right direction on both upper and lower sides of the through window and at the center are fixed in parallel to each other on the inner surfaces of the firewall main bodies 5A and 5B in multiple stages. Further, a large number of refractory blocks 7 made of a refractory material such as calcium silicate are fitted between the support members 2 in parallel. Therefore, the through window is closed by the fireproof block 7.

This fireproof block 7 is formed by combining a pair of divided pieces 7A having semicircular cable insertion recesses, and has a rectangular parallelepiped shape as a whole. A cable insertion hole 8 is formed in the center of the fireproof block 7 by the cable insertion recess of the divided piece 7A.
The inner diameter of this cable insertion hole 8 is slightly larger than the outer diameter of the large diameter cable 4A. Further, at both ends of the fireproof block 7, filling holes 9A and 9B filled with fireproof sealing material having a larger diameter than the cable insertion hole 8 are bored concentrically with the cable insertion hole 8.

On the other hand, cable fire spread prevention material 3 is provided on the exterior surface of the cable 4A to be inserted into the cable insertion hole 8.
The cable 4A is coated over a wider range than the thickness of the fireproof block 7, and the cable 4A is inserted into the fireproof block 7 with the cable fire spread prevention material 3 portion aligned so as to correspond to the fireproof block 7 portion.
is inserted into the

The cable fire spread prevention material 3 is capable of cutting off the supply of oxygen and preventing the spread of fire in the cable 4A;
and paint, tape, sheet, etc., as long as they have the strength necessary to prevent the cable sheath from swelling or bursting when heated, and can maintain the shape of the sheath near the cable passage section 12. can take various forms,
For example, F-coat B (trade name) can be used as the material.

By the way, since the outer diameter of the cable 4A is smaller than the inner diameter of the cable insertion hole 8, a clearance is created between the two, making it impossible to maintain airtightness. Therefore, here, the airtightness between the fireproof block 7 and the cable 4A is maintained by filling the fireproof sealing material filling holes 9A, 9B with heat-resistant caulking materials 11A, 11B such as F Seal B (trade name). What is done is done. In this case, it goes without saying that the heat-resistant caulking materials 11A and 11B also have the function of holding the cable 4A. Note that the cable passage portion 1 is
Although sufficient airtightness can be obtained in step 2, if a sealing material 13 such as F Seal B (trade name) is filled between the support member 2 and the fireproof block 7, and between the fireproof block 7 and the cable 4A, the airtightness can be improved. It can be made more reliable.

Second Embodiment (See Figure 3) This second embodiment is as follows:
A large-diameter cable 4A and a small-diameter cable 4B are passed vertically through the firewall 1, and then a blind stopper 1 is inserted.
This is an example in which 4 is provided. Regarding the passage portion of the cables 4A and 4B, the point where the fireproof block 7 is subdivided, and the small diameter cable 4B and the fireproof block 7 are separated.
This is the same as the first embodiment except that a spacer 15 is set between the two. Also, 1 blank plug
4 closes the hole 8 of the fireproof block 7 when there is no cable, and fulfills the airtight and fireproof function. Incidentally, reference numeral 16 denotes an adjustment block which is used to ensure that when the refractory blocks 7 are attached to the support member, they are attached in a line without any gaps.

According to this invention, a through window through which a large number of cables can be inserted is provided in the fire wall 1, and in order to close this through window, a pair of divided pieces 7A having semicircular recesses for cable insertion are combined. A large number of fireproof blocks 7, which are generally rectangular parallelepiped as a whole, are lined up to close the through windows, and many of the cable insertion holes 8 formed in each of the fireproof blocks 7 have cable fire spread prevention material 3 inserted therethrough. The cable 4A is inserted one by one, and a heat-resistant caulking material 11 is placed at the entrance and exit ends of the cable insertion hole 8.
A, 11B are filled, and the remaining part of the cable insertion hole 8 is closed with a blind stopper 14, so that large diameter cables can be attached and removed one by one. Furthermore, if predetermined cable insertion holes 8 are selected in advance and these are closed with blind plugs, when additional cables are installed in the future, the blind plugs can be removed and the cables laid.

Furthermore, the cable fire spreading material 3 is interposed between the inner surface of the cable insertion hole 8 of the fireproof block and the cable, and the inlet and outlet ends of the fireproof block are filled with heat-resistant caulking material. Even if the cable should burn on one side of the fire wall 1, the cable will not spread the fire to the other side of the fire wall 1. Furthermore, since the fireproof blocks 7, 7, ... of each stage are supported by the reinforcing support member 2, the fireproof wall is not damaged by the weight of many cables. There is.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of this invention, FIG. 2 is a front view thereof, and FIG. 3 is a cross-sectional view showing a second embodiment of this invention. In the figure, 1 is a fireproof wall, 2 is a support member, 3 is a cable fire prevention material, 4A and 4B are cables, 7 is a fireproof block, 8 is a cable insertion hole, 9
A and 9B are fireproof filler filling holes, 10 is a dividing surface, 11A and 11B are heat resistant caulking materials, 1
3 is a sealing material.

Claims (1)

[Claims for Utility Model Registration] (1) A through-hole through which a large number of cables can be inserted is provided in the fire wall 1, and a pair of semi-circular recesses for cable insertion are provided in order to close the through-hole. A fireproof block 7 formed by combining divided pieces 7A and forming a substantially rectangular parallelepiped as a whole is fixed to firewall main bodies 5A, 5B in multiple stages of reinforcing support members 2, 2, . . .
A large number of cables 4A are lined up in between and the through windows are closed, and the cables 4A are inserted one by one through the cable fire spread prevention material 3 into many of the cable insertion holes 8 formed in each fireproof block 7. , heat-resistant caulking materials 11A, 11 are provided at the entrance and exit ends of the cable insertion hole 8.
A fireproof wall structure for a cable tunnel, characterized in that the remaining part of the cable insertion hole 8 is closed with a blind stopper 14. (2) The cable insertion hole 8 and the small diameter cable 4B
A fire protection support structure for a cable in a fire protection wall of a cable tunnel according to claim 1, wherein a spacer 15 is arranged in a gap between the cable tunnel and the cable tunnel.