JPS5812518A - Vertical anchor for flame resistant cable - 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 The present invention relates to improvements in vertical anchorages in fireproof cables.

Low-voltage fireproof cables are used as wiring for emergency power circuits of disaster prevention equipment, and are, for example, stretched vertically and not separated from each floor to each floor. In the case of such vertical installation, a retaining part is provided to fix the upper part.

Conventionally used retaining parts include a wire grip type and an insulator support type. The wire grip method is, for example, as shown in Japanese Patent Publication No. 55-14'028, in which the end of the cable is treated with insulation, fireproofing, etc., and then a wire net is placed over the treated end and pulled up. . In this case, since the wire net shrinks, a large frictional force is generated between the cable sheath and the wire, and the cable can be held in place.

Further, in the insulator support system, a clamp is provided at the end of the cable conductor, and this clamp is supported via the insulator.

However, while the wire grip method can be easily applied to single-core twisted cables and is economically advantageous, it also retains weight due to the frictional force between the cable and the wire grip. Because of this, if the weight increases, a big problem arises in terms of safety. In addition, the fire-resistant properties of the terminal portion pose a problem, making it unsuitable as a tie-down portion for a fire-resistant cable.

In addition, the insulator support method can easily hold a large amount of weight due to its reliable support structure, but because it uses expensive insulators, it is more economical and easier to implement than the wire grip method. have/are having problems with being inferior. Furthermore, the insulator support method has a problem with the fire resistance of the insulator body.

It is therefore an object of the present invention to provide a vertical anchorage for fire-resistant cables that has high fire-resistant properties and is economical and easy to implement.

EMBODIMENT OF THE INVENTION Hereinafter, the vertical anchorage part of the fireproof cable according to the present invention will be explained in detail using the embodiment shown in the drawings.

Fig. 1 is a side view showing an embodiment of the fireproof cable vertical anchoring part according to the present invention, in which three lead wires 2 are pulled out from the rod anchor fitting 1, and the outer periphery of the lead wires 2 is pulled out. A fireproof layer 3 and an insulating layer 4 are provided. A different diameter connecting sleeve 5 is attached to the end of each lead wire 2.
are provided and fixedly connected to the core 6a of each fireproof cable 6. Therefore, the n
The fireproof cable 6 can be lowered by using the hole 7 in the hole 7.

In this case, the retaining fitting 1 has semi-cylindrical retaining pieces 1a and 1, as shown in a side view in FIG. 2 and a bottom view in FIG.
b is combined with n to be integrated with screw 8.

Therefore, a cylindrical central portion is formed inside, and a ring-shaped step portion 9 is provided at the bottom of the central portion. In addition, 1
, 0 are rods inserted into the hole 7 and used to lower the retaining fitting 1.

The interior of the retaining fitting 1 constructed in this way includes the parts shown in FIG.
A cylindrical spacer 11, whose main part is shown in a cutaway side view and a plan view, is accommodated and engaged with the stepped portion 9'.

Inside this spacer 110, three holes 12a to 12C are provided along the axial direction, and at the bottom thereof, step portions 13a to 13C are provided. A wire consisting of a lead #2, a refractory layer 3) and an insulating layer 4 is passed through each of the holes 1.28 to 12 cVCd, and a crimp sleeve 14 is fixed to the tip thereof. Therefore ~ a crimp sleeve 14 fixed to the wire
are engaged with the stepped portions 13B and 13c of the spacer 11, and the spacer 11 is engaged with the stepped portion 9 of the retaining fitting 1, thereby lowering the fireproof cable 60. Further, a lid (not shown) is arranged on the upper surface of the spacer 11 to ensure insulation.

The retaining fitting 1 is assembled by removing the screw 8, dividing it into two parts, housing the spacer 11, combining them, and then screwing them together.

In the vertical anchoring section of a fireproof cable constructed in this way, the wire is secured by a crimp sleeve, so it can sufficiently withstand a large load. In addition, the crimp sleeve is made of ceramic or mica laminate.

Since it is configured to engage with the retaining portion A1 through a spacer made of an insulating fireproof material, sufficient fire resistance can be ensured in the event of a fire outbreak. Furthermore, since the fireproof cable 6 is connected using the sleeve 5 of different diameter, it is possible to connect the fireproof cable 6 having a diameter larger than that of the sleeve 11.
It is economical because a variety of fire-resistant cables can be lowered using the same standard tie-down fittings.

As explained above, the vertical anchoring part of the fire-resistant cable according to the present invention has the anchoring fitting divided into two parts, and a spacer made of fire-resistant insulating material is housed inside the anchoring fitting. At the same time, a crimp sleeve fixed to the end of the wire is accommodated and fixed in the stepped hole provided in the spacer, so it is easy to attach and the fixation is reliable. This makes it easy to lower even heavy cables. Therefore, ground faults or short circuits in the event of a fire are reliably prevented.

Furthermore, by fixing the fireproof cables through sleeves of different diameters, there are various excellent effects such as being able to suspend fireproof cables of various outer diameters.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of the main part of the vertical anchoring part of a fireproof cable according to the present invention. FIG. 2 is a side view and a bottom view of the anchoring fitting shown in FIG. 1, and FIGS. FIG. 2 is a cutaway elevational view and a plan view of a main part of an example of a spacer. 1... Attachment fitting 2... Wire 3... Fireproof layer 4... Insulating layer 5... Different diameter connection sleeve 6... Fireproof cable 9... Step part 11... Spacer 12. ... Hole 13 ... Step part 1
4...Crimp sleeve patent applicant: Fujikura Electric Cable Co., Ltd. No. 3 Fig. 10 1゜Fig. 4 + 4 13゜3b

Claims (1)

[Claims] The retaining fitting has a two-part structure along the axial direction, and a spacer made of a fire-resistant insulating material is housed inside the retaining fitting, and a wire for fixing the fire-resistant cable is inserted into the stepped hole provided in the spacer. 1. A vertical anchorage for a fire-resistant cable, characterized in that it receives and engages a crimp sleeve fixed to one end.