JPH0358083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact and highly reliable connecting section for an armored submarine optical cable.

As shown in Figure 1, the connection part of a conventional armored submarine optical cable consists of the optical fiber unit of the cable,
An exterior ring 3 having an insertion groove for an exterior wire 2 is provided on both sides of a non-external layer connection part 1 connecting a water pressure layer, an internal tensile strength member, and a plastic layer, and a partially threaded sleeve 4 is caulked to this exterior ring 3. The terminals of the armored wires were fixed with nuts 5, etc., the armored rings 3 were mechanically connected to each other by the armored ring supports 6, and rubber boots 7, etc. were attached around the armored wire retainers. In this way, the armored wires are reliably connected at both ends and around the non-armored connection where the wires other than the armored wires are interconnected, so the conventional armored cable connection has sufficient mechanical strength. However, the size of the connection part is large, making it impossible to install with a small laying wire, and it takes a long time to process the terminals of the exterior wires one by one and attach them to the exterior ring.
The drawback was that it was not suitable for shipboard connections that required short-time work.

On the other hand, even in a structure where the armored wire is cut at both ends of the unarmored connection part and only the wires other than the armored wire are connected to each other,
Has tensile strength up to the breaking strength of the internal tensile strength body,
Although the dimensions can be reduced, when tension is applied to the cable connection, within the cable near the connection, the tension shared by the outer wire is applied to the internal tensile strength body, causing local cable elongation strain. growing.

Figure 2 shows the internal tensile strength members (as shown) and the exterior wires (as shown in the figure) when a tension of 12 tons (tons) is applied to the joints where the internal tensile strength members are interconnected and the exterior wires are not interconnected. ) shows an example of calculating the longitudinal distribution of elongation strain. Since the sheathed wire is cut at the end of the connection, the elongation strain of the sheathed wire becomes zero at the end of the connection, but the elongation strain of the internal tensile strength body increases, resulting in an elongation strain of 0.37% at the end of the cable.
Reach twice as much. Since the elongation strain of the internal tensile strength member and the elongation strain of the optical fiber are usually equal, in such a connection structure, the elongation strain of the optical fiber increases at the end of the connection portion, increasing the risk that the optical fiber will break.

In order to eliminate these drawbacks, the present invention has a preformed armor grip pre-shaped to the outer diameter of the armored submarine optical cable and the shape of the unarmored connection part, and is attached and bound to the connection part. The present invention will be explained in detail below with reference to the drawings.

FIG. 3 is a partial sectional view of an embodiment of the present invention, in which 11 is a preform armored grip, 12 is a binding wire, and 13 is an armored submarine optical cable. Figure 4 is a schematic diagram of the preform exterior grip;
Figures a and 5b show the cross-sections taken along line A-A' and line B-B' in Figure 4, respectively.

The preformed armored grip has multiple preformed armored grips that are shaped in advance to match the outer diameter of the armored submarine optical cable and the shape of the unarmored connection part, such as a spiral shape for the armored submarine optical fiber cable part and a straight line shape with breaks for the unarmored connection part. The wires are matched together as shown in FIGS. 4, 5a and 5b.
The surface of the wire is marked with:
Frictional force improvers, anticorrosive agents, etc. may also be applied.

Two to four preformed armored grips are placed along the unarmored connection part 1, and the armored wire 2 is helically wound around the armored submarine optical cable which is cut and shaped at the end of the unarmored connection part. The binding wire is provided to prevent the preform exterior grip 11 wound around the exterior submarine optical cable from unraveling, and is made of galvanized iron wire or the like.

Because of this structure, when tension is applied to the armored submarine optical cable connecting step during cable installation, the tension applied to the armor wires of the cable section is mutually transmitted by the preform armor grip. Therefore, compared to the case where no preform exterior grip is attached, the amount of local elongation strain of the internal tensile strength member can be reduced.

Figure 6 shows the elongation of the preform exterior grip, the internal tensile strength body (in the figure) near the connection, the sheath wire (in the figure), and the preform exterior grip (in the figure) when the length of the wrapped submarine optical cable is 3 m. An example of distortion calculation is shown below. The elongation strain of the internal tensile strength member at the end of the connection is 0.49%, which is lower than when the preform exterior grip is not attached.
It can be seen that the reduction is 0.23%. The internal tensile strength can be reduced by increasing the length of wrapping around the armored submarine optical cable to be longer than 3 m, or by appropriately selecting a friction force enhancer to increase the adhesion between the armor wire and the preform exterior grip. It is possible to make the elongation strain even smaller than the value shown in FIG.

By using the preform exterior grip, the exterior ring and exterior ring housing shown in FIG. 1 are not required, and the structure can be simplified, the connection portion can be made smaller, and the weight can be reduced. Furthermore, compared to the work of caulking a partially threaded sleeve or the like to the end of the sheathing wire, the work of attaching the preform sheathing grip can be completed in a short time, making it possible to repair and connect the sheathed submarine optical cable on board.

As explained above, by using the preform exterior grip, the armored submarine optical cable connection part of the present invention can reduce the size and weight of the conventional armored submarine optical cable connection part, making it easier to handle the connection part. Laying can now be done using a relatively small laying vessel. It is economical because material costs can be reduced. In addition, connecting work for armored cables can be completed by simply attaching pre-formed armor grips to unarmored connections and armored submarine optical cables, making it possible to connect onboard ships that require short work hours, and simplifying the configuration of submarine optical cable transmission systems. It becomes easier.

The present invention is applied to a joint between an armored submarine optical cable and a repeater in a rigid integrated submarine optical repeater, and has the advantage of simplifying the structure, making it more compact, and making it more economical.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view of a conventional armored submarine optical cable connection, Fig. 2 is a diagram showing an example of calculating the elongation strain when tension is applied to a connection that does not hold the armored wire, and Fig. 3 is a diagram of the present invention. FIG. 4 is a schematic diagram of the preform exterior grip; FIG.
Figure a is a cross-sectional view taken along A-A' in Figure 4, Figure 5 b is a cross-sectional view taken along B-B' in Figure 4, and Figure 6 is an elongational strain when tension is applied to the embodiment of the present invention. It is a figure showing an example of calculation. 1... Unarmored connection part, 2... Armored wire, 3... Armored ring, 4... Partially threaded sleeve, 5...
Nut, 6... Exterior ring body, 7... Rubber boots, 11... Preform exterior grip, 12
... Bind wire, 13 ... Armored submarine optical cable.

Claims (1)

[Claims] 1 At the connection part of an armored submarine optical cable that has an optical fiber unit in the center and is surrounded by a water pressure layer, an internal tensile strength member, a plastic layer, and an armored wire, the optical fiber unit other than the armored wire, the water pressure layer, and the inner The tensile strength body and the plastic layer are connected to each other to form an unarmored connection box, and the cable's armored wire is cut and shaped at the end of this unarmored connection, and the shape of the unarmored connection and the exterior of the armored submarine optical cable are A method for connecting an armored submarine optical cable, characterized by inserting a preformed armor grip shaped in advance according to the diameter around the unarmored connection part and the armored cable, and binding and fixing the grip.