JPS61161608A - Bonding construction between metal armor and cable sheath for metal armored 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 [Field of Industrial Application] The present invention relates to an improvement in the bond structure between a metal armor and a cable sheath in a metal armored cable.

[Prior art and problems]

Submarine cables usually have a cable sheath (metal 7-sheath).
A metal armored cable is used, in which a plastic anti-corrosion layer and a metal armor such as a single iron wire armor are sequentially applied on top of the cable.

By the way, in submarine cables, there are usually 10 to 11
If the cable is long and the cable sheath is not grounded, if a surge voltage enters the cable, high voltage will be induced in the cable sheath, and there is a risk of dielectric breakdown in the cable corrosion protection layer. For this purpose, it is known to bond the cable sheath to a metal armor (used at ground potential) at every cable number interval.

Figure 2 shows a conventional bond structure, with a pound screw 11'
An internal electrode 1' having a cable sheath (lead sheath) 2
A polyethylene layer (same material as the cable anticorrosion layer) 3' is molded on the electrode 1', and the mold layer is integrated with the polyethylene anticorrosion layer of the cable, and an external electrode is placed on the mold layer 3'. 4' and bond screw 1
1' to fix the external electrode 4' by screwing the nut 12' onto the nut 12'.
A metal sheath 5' of the cable is placed over the external electrode 4'.

However, in this bond structure, when the cable is bent, the contact pressure between the internal electrode and the cable sheath changes, and depending on the cable bending direction, the electrical It becomes difficult. Further, there is a disadvantage that the bonding screw inevitably protrudes, and the lateral pressure during cable extension acts intensively on the cable sheath via the screw.

[Purpose of the invention]

An object of the present invention is to provide a bond structure for a metal-armored cable that can stabilize bond contact resistance and eliminate concentration of lateral pressure on the cable sheath.

[Structure of the invention]

That is, the metal armored cable according to the present invention.

The bond structure between the metal sheath and the cable sheath is achieved by inserting a cylindrical electrode to which the bond conductor is connected onto the cable sheath, molding a plastic layer on the electrode with the conductor drawn out, and then molding the molded layer. is integrated with the plastic anti-corrosion layer of the cable, and then the molded layer is covered with the metal sheath of the cable, and the metal sheath is brought into contact with the conductive wire.

[Explanation of Examples]

The present invention will be explained below with reference to the drawings.

In Fig. 1, W indicates a metal armored cable, 1 is a cable core, 2 is a cable sheath (lead or aluminum sheath), and 3 is a cable sheath reinforcing layer, for example, an overlapping layer of stainless steel tape can be used. . This reinforcing layer can also be omitted. 4 is a polyethylene anticorrosion layer of the cable, and 5 is a metal armor, such as a steel wire armor.

J is a connection portion with the same diameter, and the connection is made after the cable is coated with an anti-corrosion layer during cable manufacture.

Reference numeral 6 denotes a cylindrical electrode made of a cylindrical body made of copper, and a conductive wire (copper wire) 7 for bonding is connected to this cylindrical body 6. For example, the cylindrical body 6
), the cylindrical body 6 is preliminarily coated with an EP rubber layer 61 and a polyethylene layer 6.
2 were molded at the same time. In this case, the mold temperature of EP rubber is higher than that of polyethylene (temperature required for EP rubber mold is approximately 150°C, and temperature required for polyethylene mold is 120-130°C).
), the polyethylene layer becomes fluid during molding, but
Since the thickness of the polyethylene layer is made thin, it is possible to sufficiently prevent the polyethylene layer from being washed away. 63. . . . are ring-shaped protrusions provided on the cylindrical body 6, which enhance the bonding force with the rubber layer.

This electrode 6 is inserted onto the cable sheath 2 after the cable anti-corrosion layer 4 is peeled off from the cable end after the cable anti-corrosion layer coating step.

Reference numeral 9 denotes a metal tape winding layer for diameter adjustment, and the electrodes are pressed onto this winding layer without any gaps.

8 is a plastic mold layer, after connecting the cables with the same diameter, polyethylene tape is wound around the connection part and the electrode 6, and a releasable pressing tape (Teflon, My?-, etc.) is applied thereon. The polyethylene tape wound layer is melted and integrated with the cable, and the molded layer is melted and integrated with the peeled end of the cable anti-corrosion layer.

The bonding conductive wire 7 is drawn out from the polyethylene mold layer 8, and after molding, is tightly wound on the mold layer 8, and the tightly wound wires 70 are soldered to each other.

After this soldering, the cable is transferred to the metal armoring process,
A metal armor 5, for example, a steel wire armor, is applied to the entire length of the cable. Thus, the metal armor and cable sheath are bonded via the bond conductive wire.

〔Effect of the invention〕

The bond structure between the metal armor and cable sheath in the metal armored cable according to the present invention is as described above, and the cylindrical electrode is inserted through the cable sheath.
Even if the cable is bent and deformed, fluctuations in the contact pressure between the cable sheath and the electrode can be well prevented, and the electrical contact state can be maintained stably. In addition, a bond wire is used for the bond member between the cable sheath (electrode) and the metal armor, and unlike the conventional example shown in Figure 2, there is no local protrusion of the bond member (screw) from the anti-corrosion layer, so it is comparable to the electrode. It is possible to prevent lateral pressure from acting intensively on the cable sheath.

In particular, in the example shown, the electrode is provided with a rubber layer and a polyethylene layer in advance, and the watertightness between the electrode and the rubber layer is good due to the excellent adhesion of the rubber to metal. The watertightness between the rubber layer and the polyethylene mold layer is also good because of the polyethylene layer provided in advance on the rubber layer, and the overall watertightness can be improved well.

Figure 2 shows the conventional bond structure.
′ ゛ - Partial side view.

In the figure, 2 is a cable sheath, 4 is a plastic anti-corrosion layer of the cable, 5 is a metal armor, 6 is a cylindrical electrode, 61
is a rubber layer, 62 is a plastic layer, and 8 is a plastic mold layer.

Claims (2)

[Claims] (1) inserting a cylindrical electrode to which a bond conductor is connected onto the cable sheath, molding a plastic layer on the electrode with the conductor drawn out, and integrating the mold layer with the plastic anti-corrosion layer of the cable; A bond structure between a metal sheath and a cable sheath in a metal armored cable, characterized in that the mold layer is then covered with a metal sheath of the cable, and the metal sheath is brought into contact with the conducting wire. (2) A bond structure between a metal armored cable and a cable sheath in a metal armored cable according to claim 1, characterized in that a rubber layer and a plastic layer are sequentially provided on the cylindrical electrode in advance.