JPH0733536Y2 - Conduit terminal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement in the terminal structure of a conduit.

[Conventional technology]

Conventionally, the conduit end structure in the case of penetrating a fireproof compartment with a conduit is also disclosed in Japanese Utility Model Publication No. 58-32430.
Generally, as shown in FIG. 2, a flame-resistant seal material 4 is put on the cable 3 at each end of the conduit tube 2 penetratingly arranged in the partition wall 1 such as a wall or a floor, and the flame-proof seal material together with the end portion of the conduit tube 2 is attached. 4 was surrounded and clamped by a holding metal fitting 5 divided into two.

[Problems to be solved by the invention]

The conventional conduit end structure as described above is extremely excellent in that the fireproof performance for 2 hours can be guaranteed even if the protrusion of the conduit 2 from the partition wall 1 is greatly shortened.
However, although it is excellent in fireproofness, it was insufficient for use in a place where not only fire resistance but also airtightness is required such as a nuclear power plant.

SUMMARY OF THE INVENTION An object of the present invention is to provide an end portion structure of a conduit tube which is excellent not only in fire resistance but also in airtightness, focusing on the problems of the above-described conventional conduit terminal structure.

[Means for Solving Problems] As a means for achieving such a technical problem, the present invention provides a flame-retardant foam sealing material on a cable at the end of a conduit tube,
The flame-retardant sealing material, which is placed in contact with this, is pressed together with the flame-retardant foam sealing material in a compressed state by a metal fitting.

[Action]

According to the end portion structure of the conduit of the present invention having the above-described configuration, the flame-retardant foam sealing material is tightened in a compressed state by the retainer and the property (expansion) of the foam sealing material itself. The stress is always applied to the cable, and the flame-retardant foam sealing material makes close contact with the cable.

〔Example〕

Hereinafter, the structure of the terminal portion of the conduit of the present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a structure of a terminal portion of a conduit according to an embodiment of the present invention, and FIGS. 3 and 4 show a forming process thereof.

In the conduit end structure according to this embodiment, a suitable ring-shaped adapter 6 is attached to the end opening of the conduit 2. A flame-retardant foam sealing material (for example, a silicon ohm sheet) 7 is provided on the cable 3 so as to contact the ring-shaped adapter 6. This flame-retardant foam sealing material is wound in a band shape on the cable 3, and at this time, this band-shaped flame-retardant foam sealing material is wound until it has an outer diameter larger than the inner diameter of a holding metal fitting described later (Fig. 4). ). Thereafter, the flame-resistant sealing material 8, for example, Dunseal P manufactured by Furukawa Electric Co., Ltd., is placed on the cable 3 adjacent to the flame-retardant foam sealing material 7.

In this way, the flame-retardant foam sealing material 7 is applied from the end portion side of the conduit tube 2.
After the flame-resistant sealing material 8 is provided on the cable 3, the flame-retardant foam sealing material is formed by using the same holding metal fitting 5 used in the conventional terminal structure shown in FIG. 7 and the flameproof sealant 8 are surrounded and tightened.
That is, the tubular pressing metal fitting 5 is composed of two metal fitting portions which are vertically divided along the axial direction thereof, and a flange portion protruding outward in the radial direction is formed on each side edge as a mating surface of these metal fitting portions. Further, screw mounting holes are formed at both ends of the flange portion for fixing and integrating both metal fittings with each other. One end of the holding metal fitting 5 is slightly squeezed, and one end of the electric wire tube 2 is tightened and connected so as to include the ring-shaped adapter 6 attached to the end portion of the electric wire tube 2 at one end thereof. Mounted as. When the pressing metal fitting 5 divided in two is attached in this manner, the flame-retardant foam sealing material 7 has an outer diameter of the pressing metal fitting 5 as described above.
Since it is larger than the inner diameter of, it is forcibly enclosed in the holding metal fitting 5 while being compressed so as to be surrounded.

In the terminal structure of the conduit completed as above,
Due to the fact that the flame-retardant foam sealing material 7 is enclosed in the pressing metal fitting 5 in a compressed state and the expansive property of the foam sealing material itself, the foam sealing material 7 is applied to the wound cable 3. Since the stress for closer contact is always applied, the sealing property at the end of the conduit becomes extremely excellent.

Further, the flame-retardant foam sealing material 7 has a property that the gas in each bubble expands due to heat, which causes a remarkable volume increase. Therefore, if a fire occurs on either side of the partition wall, The flame-retardant foam sealing material expanded by heat is further closely attached to the cable to further exert its sealing effect.

[Effect of device]

As described above, according to the end portion structure of the conduit of the present invention, the flame-retardant foam sealing material is enclosed in the compressed state between the end surface of the conduit and the flame-resistant sealing material inside the holding metal fitting. Therefore, not only fire resistance but also airtightness can be provided. Moreover, in the event of a fire, the heat expands the gas in each bubble, causing the flame-retardant foam sealing material to significantly increase in volume, so that it has an excellent effect of further adhering to the cable and exerting its sealing performance. Play.

[Brief description of drawings]

FIG. 1 is a sectional view showing a terminal structure of a conduit according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a conventional terminal structure of a conduit, and FIG. 3 is FIG. A perspective view showing a conduit end portion in the process of forming the terminal structure of the conduit shown in FIG.
FIG. 4 is a cross-sectional view showing a state immediately before the attachment of the holding metal fitting in the process of forming the terminal portion structure of the conduit shown in FIG. 2 ... Conduit tube, 3 ... Cable, 5 ... Holding metal fitting, 6 ... Ring adapter, 7 ... Flame-retardant foam sealing material, 8 ... Flame resistant sealing material.

Claims (1)

[Scope of utility model registration request] 1. A flame-retardant foam seal material is provided around an end portion of a cable passing through a conduit, and a flame-resistant seal material is further provided adjacent to the cable around the cable. The flame-resistant sealing material and the flame-retardant foam sealing material together with a portion of the flame-retardant foam sealing material in a compressed state and clamped by a holding metal fitting and connected to the conduit tube end portion. Conduit terminal structure.