JPH0448101Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a disaster prevention trough for cables, which is used to draw power cables into the trough and prevent arcs from leaking outside due to short circuits in the cables. be.

[Conventional technology] For example, when installing a gas pipeline such as LNG and a CV cable in a tunnel on the ocean floor or underground,
Thorough disaster prevention measures are required to prevent fires from occurring due to arcs caused by cable short circuits, etc. However, when using a conventional general trough, a gasket is interposed between the flange that is the joint between the trough body and the trough lid covering it, and the fittings such as bolts and nuts are inserted at predetermined intervals. However, even though there is a gasket between the flanges, there is a slight gap in some parts, so if the cable is shorted, there is a risk that an arc will leak through the gap and cause a serious fire accident. be.

[Purpose of the invention] In order to eliminate such risks, the purpose of the invention is to create a highly safe disaster prevention trough for cables that prevents arcs from leaking outside from the joint between the trough body and the trough cover. Our goal is to provide the following.

[Summary of the invention] The gist of the invention to achieve the above objectives is as follows:
Disaster prevention tape made of flame-retardant and electrically insulating material is sandwiched between the flanges on both sides along the longitudinal direction, which are the joints between the trough body that accommodates the cable and the trough cover that covers it, via packing. This is a disaster prevention trough for cables characterized by the following features.

[Embodiments of the invention] The invention will be described in detail based on illustrated embodiments.

FIG. 1 is a cross-sectional view of the trough, showing the flanges 1a and 1b on both sides along the longitudinal direction of the trough body 1.
Disaster prevention tape 5a,
5b are sandwiched between them.

This disaster prevention tape 5 is made of a soft synthetic resin material that is flame retardant and electrically insulating. For example, as shown in FIG. However, double-sided adhesive tape 7 is attached to the other side. As shown in FIG.
If the disaster prevention tapes 5a, 5b are pasted on the gaskets 4a, 4b attached to the gaskets 4a, 4b, when covering the trough body 1 with the trough lid 2, the gaskets 3a, 3b and gaskets 4a, 4b will be easily attached. Disaster prevention tapes 5a and 5b can be easily sandwiched between them.

It should be noted that the flanges 1a, 2a and 1b, 2b are spaced apart from each other at a predetermined distance in the longitudinal direction and are tightened with fittings such as bolts and nuts, as is conventional.
In general, a single-sided flange 1 is used as shown in Figure 1.
Between a and 2a, the flange 2a on the trough lid body 2 side is fitted into a stopper 8 fixed in advance to the trough body 1 side, and between the flanges 1b and 2b on the opposite side, a bolt 9 is passed and tightened. Of course, the bolt passage holes provided on the flanges 1b and 2b are also covered with the disaster prevention tape 5b, so when inserting the bolt 9, the disaster prevention tape 5b in that area is closed.
It is necessary to drill holes using a drill or the like.

In the above-mentioned embodiment, the disaster prevention tapes 5a, 5b are attached to the gaskets 3a, 3a, 2b of the flanges 1a, 2a, 1b, 2b.
Since it is sandwiched between 4a, 3b, and 4b, there is no gap between the mating surfaces of the trough body 1 and the trough lid 2, and there is no possibility that the arc will leak to the outside.

FIG. 4 shows that the width of the disaster prevention tapes 5a, 5b shown in FIG. 1 has been increased, and the flanges 1a, 2a, 1b,
This is an embodiment in which the disaster prevention tapes 5a, 5b sandwiched between 2b hang down like a skirt, and in this case, the leakage of the arc A generated inside is more completely prevented by the hanging parts of the disaster prevention tapes 5a, 5b. can be prevented. In this case, the double-sided adhesive tape 7 of the disaster prevention tapes 5a, 5b may be provided only on the adhesive portions.

Furthermore, the areas between the flanges 1a, 2a, 1b, 2b are tightened by the stopper 8 more than the 1b, 2b side which is tightened by the bolt 9.
Since the tightening force on the a side is weak, gaps are likely to occur. As one means for eliminating this gap, for example, as shown in FIG. 5, a set screw 11 may be attached to the stopper 8, and the set screw 11 may be screwed in to further tighten the space between the flanges 1a and 2a.

[Effects of the invention] As explained above, the disaster prevention trough for cables according to the invention includes a flame retardant and electrically insulating material between the flanges on both sides along the longitudinal direction, which are the joints between the trough body and the trough cover. Since the disaster prevention tape is sandwiched between the gaskets, the gap created at the seam is completely closed by the disaster prevention tape, and the arc that occurs when the cable housed inside the trough is short-circuited, for example, leaks to the outside. This makes it possible to prevent fires from occurring. Therefore, gas pipes and CV in the same tunnel
Sufficient safety can be ensured even when a cable is installed.

[Brief explanation of the drawing]

The drawings show an embodiment of the disaster prevention trough for cables according to the present invention; FIG. 1 is a cross-sectional view thereof, FIG. 2 is a cross-sectional view of the disaster prevention tape, and FIG. 3 is a view of the trough body and trough lid separated. Cross-sectional view, Figures 4 and 5
The figure is a cross-sectional view of another embodiment. 1 is the trough body, 2 is the trough lid, 3, 4
5 is a packing bag, 5 is a disaster prevention tape, 6 is a PVC film, 7 is a double-sided adhesive tape, and 8 is a fastener.

Claims (1)

[Claims for Utility Model Registration] 1. Between the flanges on both sides along the longitudinal direction, which are the joints between the trough body that accommodates the cable and the trough cover that covers it, a flame-retardant and electrically insulating material is provided. A disaster prevention trough for cables, characterized in that a disaster prevention tape is sandwiched through a packing. 2. The disaster prevention trough for cables according to claim 1, wherein the disaster prevention tape is adhered to a gasket attached to a flange on the trough lid side. 3. Disaster prevention for cables according to claim 1, wherein a part of the disaster prevention tape in the width direction is sandwiched between the flanges of the seam, and the remaining part hangs down inside the trough body. trough.