JPS605717A - Method of inserting cable passing unit - 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 [Technical Field of the Invention] The present invention relates to a method for constructing cable penetrations in floors or walls.

[Technical background of the invention] Conventionally, when introducing a cable into a fire protection compartment partitioned by a floor or wall, the cable is passed through a cable penetration hole provided in the floor or one wall, and then the cable is inserted into the floor or wall. Alternatively, a fireproof bulkhead is formed at the cable penetration hole in the wall.

Such a fireproof bulkhead is constructed by covering the cable penetration hole in the floor or wall with a fireproof board that has a cable penetration hole, and after passing the cable through the cable penetration hole in this fireproof board, the cable penetration hole between the fireproof board and the floor or wall is covered. Fill the gap with non-combustible material,
A structure in which the top is covered with fireproof putty is known.

[Problems in the Background Art] Now, the "Technical Standards for Electrical Equipment" revised in 1986 requires a single point support system at the top for vertical cables installed in buildings, etc. According to the above, if a support portion with sufficient strength is formed at the top, cable support at the middle portion is not required.

However, in this case, a phenomenon occurs in which the cable moves up and down due to changes in the load on the cable, changes in ambient temperature, and the like. Therefore, if the conventional cable penetration construction method is applied to a cable installed using this top single-point support method, the noncombustible material filled in the gap between the cable and the fireproof plate will not be able to follow the vertical movement of the cable. This creates a gap between the cable and the noncombustible material, and there is a risk that the initial smoke and fire prevention properties will be lost. A similar phenomenon is also thought to occur when the cable shakes in a direction perpendicular to the axis of the cable due to an earthquake or the like.

[Objective of the Invention 1] The present invention has been made in order to eliminate such conventional drawbacks, and aims to provide a construction method for a cable penetration part in a floor or wall that can cope with the movement of vertically laid cables due to thermal expansion and contraction. It is something.

[Summary of the Invention] In other words, the method for constructing a cable penetration part of the present invention includes an inner pipe that follows the cable on the outer periphery of the cable penetration part that penetrates a floor or a wall, and an inner pipe that is located outside of this inner pipe. The present invention is characterized in that there is an outer pipe fixed to the floor or wall with a gap between the inner and outer pipes, and a fireproof partition is formed by attaching a noncombustible backing between both the inner and outer pipes.

[Embodiments of the invention] Embodiments of the present invention will be described below based on the drawings.

The drawing is a cross-sectional view of a cable penetration in a floor formed in accordance with the present invention. The cable penetration part of this floor is formed as follows.

A nonflammable inner pipe 2 having a gap with respect to the cable 1 is arranged around the outer periphery of the cable 1 through-hole, and the gap between the cable 1 and the inner pipe 2 is filled with a nonflammable material 3 such as rock wool. Both ends of the inner pipe 2 are fixed to the cable 1 by means of a cross-section shaped part fixed to the cable 1 or other arbitrary fixing means, and on this fixing part, a fireproof wire is installed across the cable 1 at the end of the inner pipe 2. The putty 4 is filled, thereby closing the inside of the inner pipe.

Next, a non-combustible outer pipe 5 is provided outside the inner pipe 2 and creates a gap of equal width between the inner pipe 2 and the inner pipe 2,
The upper and lower parts of this outer pipe 5 are fixed to two annular fireproof plates 7.8 installed so as to sandwich the floor 6. The space surrounded by the outer pipe 5, the floor 6, and the fire prevention plate 7.8 is filled with noncombustible material 3, and the joints between the upper part of the outer pipe 5 and the fire prevention plate 7 and the lower part of the outer pipe 5 and the fire prevention plate 8 are Fireproof putty 4 is filled into the minute gaps.

A noncombustible material 3 is also filled between both the inner and outer pipes 2.5 installed in this manner, and an annular noncombustible backing 9 is placed so as to sandwich the upper and lower sides of the noncombustible material 3.

This nonflammable backing 9 is fixed to the inner pipe 2 and is attached to the outer pipe 5 with a small gap therebetween. Furthermore, the fireproof putty 4 is also filled into the minute gap at the joint between the noncombustible backing 9 and the inner pipe 2. Note that the nonflammable backing 9 may be made of iron, and the outer pipe 5 may be made of mica. In this case, the iron material expands more than the mica pipe due to the heat generated during the fire, so it is possible to effectively close the minute gap that occurs between the two.

Although the above embodiment is an example in which the present invention is applied to a cable penetration part in a floor, the present invention is not limited to such an embodiment, but can be similarly applied to a cable penetration part in a wall.

[Effects of the Invention] As explained above, according to the construction method of the cable penetration part of the present invention, initial smoke prevention is achieved without creating a gap between the cable and the noncombustible material when the cable moves in the axial direction. , it is possible to maintain fireproof performance, and it is also possible to maintain smokeproof and fireproof performance even when the cable is shaken in a direction perpendicular to the axis of the cable.

[Brief explanation of drawings]

The drawings are cross-sectional views of cable penetrations formed according to embodiments of the invention. 1......Cable 2...Inner pipe 3...
・・・・・・Noncombustible material 4・・・・・・・・・Fire protection putty 5・・・・・・・・・Outer vibro・・・・・・
...Floor 7.8 ...Fire board

Claims (2)

[Claims] (1) There is a gap between the inner pipe that follows the cable on the outer periphery of the cable penetration part that penetrates the floor or wall, and the inner pipe that is located outside of this inner pipe, and the cable is fixed to the floor or wall. A method for constructing a cable penetration part, characterized in that a fireproof bulkhead is formed by forming a fireproof bulkhead by attaching a noncombustible backing between the inner and outer pipes. (2) The method for constructing a cable penetration section according to claim 1, wherein the gap between the joints is covered with fireproof putty when forming the fireproof bulkhead.