JPS6140026Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel configuration of a power/fiber optic composite cable that is wound around a drum and shipped from a cable manufacturing factory.

Recently, a so-called power optical fiber composite cable, in which an optical fiber cable core is inserted between the power cable cores of a power cable, is being put into practical use as a new type of cable.

As shown in Figure 1, an example of this type of cable is one in which a conductor 1 is insulated 2 to form a power cable core, two or three cores are twisted together, and a single core or multiple cores are connected to the intervening part. There is a composite cable in which an optical fiber cable 4 containing fibers is inserted and twisted at the same time, and an upper winding 5 and a jacket 6 are applied.

When such a composite cable is shipped from a cable manufacturing factory, it is wound on a drum in units of length, and both ends are cut in a cross-sectional direction perpendicular to the length of the cable and sealed with a metal cap, etc. will be shipped. Also, when using this composite cable,
After the cable is pulled out from the drum and into a conduit or trough at a predetermined location, it is connected in the same way to another separately laid composite cable, and further terminal processing is performed at both ends. This terminal processing is usually performed in the following manner. To explain using FIG. 2, first, several meters of the outer sheath of the terminal end of the composite cable 7 is stripped off, the power cable core 3 is opened into a Y-branch shape, and the power cable core terminal section 8 is formed using a stress cone or other material. At the same time, the optical fiber cable core 4 is drawn out at a location far away from the power cable core end portion 8 and is connected in a straight line 9 to a separately manufactured optical fiber cable 4'. Further, another terminal of the optical fiber cable 4' is led into and connected to the optical transmission equipment 10. The stripping length of the composite cable jacket required for this terminal treatment is the length of the power cable core required to open the power cable core into a Y-branch shape and form the power cable core terminal part, and the length of the power cable core required to open the power cable core into a Y-branch shape, and the length of the power cable core required to form the power cable core terminal part. It is determined by the length of the optical fiber cable core necessary to form the optical fiber connection part by keeping it away from the fiber terminal part to a place where the connection work will not be hindered by the influence of voltage, etc., but in general, the former is 2 m or less, and the latter is In addition to the above 2m, when connecting optical fiber cables, it is necessary to keep the optical fiber cables in a straight line, and considering the surrounding work environment, approximately 1m for connection work is taken into account, so the total length is approximately 3m. Therefore, the peeling length of the outer covering must be adjusted to the latter. In this case, after stripping off the outer sheath of the composite cable, the power cable core must be cut to the required length before proceeding with the terminal processing operation, resulting in a lot of waste of the expensive power cable core. On the other hand, the optical fiber cable core 4 is connected to a separately manufactured optical fiber cable 4' and extended to the optical transmission equipment 10.
In many cases, it may be the same as

Therefore, if the optical fiber cable core 4 is long enough to reach the optical transmission equipment 10 from the beginning, the optical fiber cable connection part 9 will not be necessary, and there will be waste due to the difference in required length between the power cable core and the optical fiber cable core as described above. will also disappear.

The present invention has been developed from this viewpoint, and is configured such that, in a power/optical fiber composite cable wound around a drum, the optical fiber cable core protrudes beyond the power cable core at least at one end of the composite cable. It is characterized by this.

The present invention will be explained based on the embodiment shown in FIG.

In FIG. 3, the same symbols as in FIG. 1 indicate the same things.

That is, the conductor 1 is provided with insulation 2 and the power cable core 3 is
A plurality of fibers are twisted together, and an optical fiber cable core 4 containing a single fiber or a plurality of fibers is interposed in the intervening part of the power cable core, and the upper winding 5 and the outer sheath 6 are twisted together at the same time as the power cable core. The optical fiber cable core 4 is manufactured to be longer than the power cable core 3 by an amount L, and that portion is left in an extended state without being twisted. The upper winding 5 and sheath 6 after twisting are also applied only to the composite twisted part. In this case, the optical fiber cable core 4 is usually sheathed with a metal sheath, plastic sheath, laminate sheath, etc. as a cable core. Even if it sticks out from the end of the composite cable part in that state, it will not be damaged.

In addition, after such a cable is wound around a drum, the power cable core and the optical fiber cable core are subjected to electrical tests, transmission characteristic confirmation tests, etc., and then moisture is removed at the composite part end A and the optical fiber cable core end B. The product is shipped sealed using tape, shrink tubes, caps, etc. to prevent foreign substances from entering.

In the present invention, the optical fiber cable core may be configured to protrude beyond the power cable core at both ends of the composite cable, or at only one end. If it is necessary to attach a pulling eye, etc. to one end of the cable, it may be difficult to leave the optical fiber cable core sticking out at that end for a long time depending on the structure of the pulling eye. It is possible to do so by adding grooves, etc.

Furthermore, when winding a composite cable onto a drum, the optical fiber cable core is protruded from the beginning of the cable, and by using a drum with shelves, winding and finished cable inspection can be carried out without any problems. .

As described above, the power optical fiber composite cable of the present invention is constructed so that the optical fiber cable core protrudes beyond the power cable core by the required length L, so in the cable terminal treatment after installation, it is necessary to By stripping off the outer sheath from the end to the length required to form the terminal end of the power cable core,
In particular, the work can be done without cutting out the power cable core. It also has the advantage that it can be directly connected to optical transmission equipment, etc., without connecting an optical fiber cable core. Another advantage is that even when the power cable core terminal stands up in the cubicle, the optical fiber cable core does not become jammed, so there is almost no need for special consideration regarding dimensions and structure.

[Brief explanation of drawings]

Figure 1 is a sectional view of the power/optical fiber composite cable, Figure 2 is an explanatory diagram of the composite cable terminal processing method,
FIG. 3 is an explanatory diagram of an embodiment of the power/optical fiber composite cable of the present invention. In the figure, 1 is a conductor, 2 is an insulator, 3 is a power cable core, 4 is an optical fiber cable core, 5 is an upper winding,
6 is the jacket, 7 is the power/optical fiber composite cable,
Reference numeral 8 indicates a power cable core end portion, 9 an optical fiber cable connection portion, 10 an optical transmission device, 4' an optical fiber cable manufactured separately, and L the optical fiber cable core protrusion length.

Claims (1)

[Scope of utility model registration request] In a power/optical fiber composite cable wound around a drum, the optical fiber cable core protrudes beyond the power cable core by a length longer than necessary to form an optical fiber cable connection at at least one end of the composite cable. A power/optical fiber composite cable that is characterized by: