JPH0213216A - Conduit tube apparatus for floor slabs - Google Patents

Abstract

PURPOSE:To prevent smoke from flowing out to the floor surface side, even if a refractory material emits smoke when heated, and to improve the fire resistance of an apparatus by covering the top surface of said refractory material with a metal plate. CONSTITUTION:In the conduit tube apparatus for a floor slab 1, the top surface and outer peripheral face of a first refractory material 8 is covered with a metal plate 20 and the top surface of a second refractory material 9, with a metal plate 21. The first and second refractory materials 8, 9 thermally expands by a chemical reaction when heated, to seal wire insertion holes 8a, 9a at the inner periphery and the through hole 1a of said floor slab 1 to prevent flame and smoke from going to the floor surface side. Said refractory materials 8, 9 sometimes emit smoke by heating, but the emitted smoke does not flow out to the floor surface side of said floor slab 1 through a conduit tube 6, because the top surface of said materials is covered with said metal plates 20, 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a conduit device for a floor slab that vertically penetrates a fire-resistant floor slab for electrical wiring.

[Conventional technology]

Conventionally, as shown in Fig. 142, electric wires 3 are wired inside a double ceiling consisting of a concrete floor slab 1 and a ceiling material 2.
An electric wire 3 is connected to an outlet 4 on the upper surface of the floor slab 1 through an electric conduit device 5 installed in a through hole 1a of the floor slab 1. Outlet 4 is used for electricity such as office equipment on the floor.
It supplies electricity to the appliance, and the outlet block 4
A exists.

When providing a penetration part in the floor slab 1 and passing the electric wire 3 through it in this way, in order to be recognized as a fire-resistant structure, it is necessary to meet the predetermined standards under the Building Standards Act and the Fire Service Act.

These standards include the following:

Heating is performed from the ceiling side along a predetermined heating curve in the zero penetration part, and the back surface temperature (the upper surface of the floor slab 1 or the outer shell of the outlet 4) does not exceed the predetermined temperature.

■There should be no flame or smoke leaking to the floor side during heating.

■ After heating, there are cracks around the outlet 4 and the penetration part.
No shells or cracks should occur.

In order to satisfy this standard, the conduit device 5 has an upper conduit 6.
and a lower electric conduit 7, with a first refractory material 8 interposed between the two. Further, a second refractory material 9 is embedded between the positive electric conduit 6 and the electric wire 3. 6d is a protruding portion of the refractory material support. The fireproof material 89 has a hole in the center thereof through which the electric wire 3 is passed.

10 is a base, 11 is a lock nut, and 16 is a nipple.

As shown in FIG. 3, the lower conduit 7 has a connecting protrusion 7a at the upper end.
The connecting protrusion 7a is passed through the notch 8a of the refractory material 8 and engaged with the engagement hole 6b of the flange 6a of the positive conduit 6. Thereby, the positive conduit 6 and the lower conduit 7 are connected and fixed to each other. The positive conduit 6 and the lower conduit 7 each have a threaded portion 6c to which a base IO and a stud head 11 are attached.

7b is formed.

The electric wire 3 is inserted into the conduit device 5 from below and pulled out to the floor side. Next, after passing the refractory material 9 through the electric wire 3, it is pushed into the positive conduit 6, and the base 10 is attached to the positive conduit 6. After this, the outlet 4 is attached to the base 10 and fixed with the fixing screw 4b.

[Problem to be solved by the invention]

In a fire resistance test assuming a fire, the fireproof material 8.9 thermally expands due to a chemical reaction immediately after heating starts, and the wire insertion hole 8 on the inner periphery
b, 9b and the through hole 1a of the floor slab 1 are sealed to prevent flame and smoke from passing through to the floor surface side.

However, due to the material properties of the refractory material 8.9, smoke may be emitted during chemical reactions, and due to the smoke emitted, the above-mentioned standard (2) for preventing smoke leakage cannot be satisfied.

An object of the present invention is to provide a conduit device for a floor slab that has excellent fire resistance and can prevent smoke from a refractory material from flowing out to the floor side.

[Means to solve the problem]

In this invention, a positive conduit and a lower conduit that communicate with each other are buried in a floor slab with their upper and lower ends open, a first refractory material is interposed between the positive conduit and the lower conduit, and a second refractory material is interposed between the positive conduit and the lower conduit. In a conduit device for a floor slab in which a refractory material is fitted inside the main conduit or the lower conduit, the upper surfaces of the first refractory material and the second refractory material are covered with a metal plate.

(Function) According to the structure of the present invention, since the upper surfaces of the first and second refractory materials are covered with metal plates, even if the refractory materials emit smoke during heating, the smoke flows out from the inside of the upper conduit to the floor side. It is prevented from doing so.

〔Example〕

An embodiment of the present invention will be described based on FIG. Note that the same parts as in the example of FIGS. 2 and 3 are given the same reference numerals, and the explanation thereof will be omitted.

This conduit device for a floor slab has a metal plate 20 covering the upper surface and outer peripheral surface of the first refractory material 8, and a metal plate 21 covering the upper surface of the second refractory material 9. metal plate 20.21
is made of steel plate etc.

According to this configuration, the first and second refractory materials 8.9 thermally expand due to a chemical reaction when heated, and seal the inner wire insertion holes 8a to 9a and the through hole 1a of the floor slab 1, as described above. , to prevent flames and smoke from passing through to the floor side.

The refractory material 8.9 may emit smoke when heated, but since the upper surface is covered with the metal plate 20.21, the emitted smoke flows through the positive electric conduit 6 to the floor side of the floor slab 1. Never. The outer circumferential surface of the first refractory material 8 is exposed from the -L conduit 6 and the lower conduit 7, but this outer circumferential surface is also exposed to the metal plate 20.
Since the first refractory material 8 is covered with , smoke generated from the first refractory material 8 is also prevented from flowing out from the through hole 1a of the floor slab 1.

In the above embodiment, the outer circumferential surface of the first refractory material 8 was covered with the metal plate 20, but if the main conduit 6 and the lower conduit 7 are to be embedded in the floor slab l when they are cast, the first The outer peripheral surface of the refractory material 8 does not need to be covered with the metal plate 20. Also,
The second refractory material 9 may be provided within the lower conduit 7.

(Effects of the Invention) In the floor slab conduit device of the present invention, the upper surfaces of the first and second refractory materials are covered with a metal plate, so even if the refractory materials emit smoke during heating, the smoke will not enter the upper conduit. This has the effect of preventing water from flowing out to the floor and improving fire resistance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of a conventional example, and Fig. 3 is an exploded perspective view thereof. - Outlet, 6... Upper conduit, 7... Positive conduit, 8... First refractory material, 9
...Second refractory material, 20.21...Metal plate M No. ! Figure c/Figure c

Claims (1)

[Claims] An upper electrical conduit and a lower electrical conduit that communicate with each other are buried in a floor slab with their upper and lower ends open, and a first refractory material each having a wire insertion hole is interposed between the upper electrical conduit and the lower electrical conduit, A conduit device for a floor slab in which a second refractory material is fitted into the upper conduit or the lower conduit, characterized in that the upper surfaces of the first refractory material and the second refractory material are covered with a metal plate. floor slab conduit equipment.