JPH053614A - Extending method for light-electric power composite cable - Google Patents

Abstract

PURPOSE:To prevent the shear between a power cable core and a subduct for passing optical fibers by not only binding an end of the power cable core to a pulling eye simply but also binding the end of the subduct for passing optical fiber cables through too to the pulling eye, and extending the cable. CONSTITUTION:Along with attaching and fixing the conductor 8A of a power cable core 8 with a pulling eye 6, a reinforcing bar 13 is inserted into the end of a subduct 9 for passing optical fiber cables through. And after that the subduct is compressed by a pulling eye 10, and is fixed tight inside a recession 10A along with the reinforcing bar 13. And the power cable core 8 and subduct 9 are simultaneously pulled through the medium of the pulling eyes 6 and 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical / electric power composite cable in which an optical fiber cable and an electric power cable are combined and which is used, for example, for power distribution in a factory or building, or for power transmission / distribution in a power plant or substation. The present invention relates to a method of drawing a wire using a pooling eye.

[0002]

2. Description of the Related Art Recently, an optical / electric power composite cable in which an electric power cable and an optical fiber cable are combined is frequently used for power distribution in factories and buildings, or for power transmission and distribution in power plants and substations. FIG. 3 illustrates the configuration of an optical / power cable called a triplex type power cable.

The triplex type power cable has a conductor 8
Insulating layer 8B of polyethylene, cross-linked polyethylene, etc. on A
And at least one, in this example, three optical fiber cable passage sub-ducts, each of which is formed by providing a plastic sheath 8C such as polyethylene or polyvinyl chloride as the outermost layer. 9 and 9 are twisted together.

At present, the extension of the optical / electrical power composite cable having such a structure is made by connecting a pulling eye to the conductor 8A and pulling it.

[0005]

However, since the sub-duct 9 is formed of plastic such as polyethylene and is simply twisted with the power cable core 8 as described above, the conductor 8A is Only by pulling, there is a problem that the sub-duct 9 slips on the surface of the sheath 8C, causing a gap between the sub-duct 9 and the power cable core 8.

Therefore, it is an object of the present invention to not only connect the end of the power cable core to the pooling eye,
At the same time, the end of the optical fiber cable sub-duct is also connected to the pooling eye and extended to prevent a deviation between the power cable core and the optical fiber sub-duct. Is to provide a wire drawing method.

[0007]

The above-mentioned object can be achieved by the method of extending the optical and electric power composite cable according to the present invention.
In summary, the present invention relates to a method for extending an optical / electrical power composite cable, which is configured by twisting a power cable core and an optical fiber conduit sub-duct, in which a conductor of a terminal of the power cable core is used as a pooling eye. At the same time as sticking,
After inserting a reinforcing rod into the inside of the end of the sub-duct for optical fiber passage, the end of the sub-duct for optical fiber passage is fixed to another pooling eye, and each power cable core and the light are passed through the pooling eye. It is a method for extending a combined optical and electric power cable, characterized in that a fiber duct sub-duct is pulled at the same time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical / electrical power composite cable drawing method of the present invention will be specifically described below with reference to the drawings.

Referring to FIG. 1 and FIG. 2, in the present embodiment, the optical / electrical power composite cable drawing method of the present invention uses an optical / electrical cable as a triplex type electric power cable as shown in FIG.
It is applied to the extension of power cables.

In the present embodiment, the pooling device used for cable extension is provided with an extension line cap 1 and a mounting hole 2 for connecting a pulling rope (not shown) to the base end of the line extension cap 1. And a support plate 4 is detachably attached to the opening end on the opposite side by, for example, screw fitting. The support plate 4 has a mounting hole 7 for mounting the pooling eye 6, and the screw shaft 5 of the pooling eye 6 is inserted into the mounting hole 7.
The pooling eye 6 is fixed to the support plate 4 by screwing the screw shaft 5 into the nut 5A. Pooling eye 6
At the other end of the recess 6A is formed a hollow recess 6A.
The conductor 8A portion at the end of the power cable core 8 from which the coating layers 8B and 8C have been removed is inserted into A, and the pooling eye 6
The conductor 8A of the power cable core 8 is fixedly mounted in the recess 6A by compressing.

According to the present invention, the support plate 4 is further provided with a mounting hole 12 for the pooling eye 10, and the screw shaft 11 of the pooling eye 10 is inserted into the mounting hole 12 to form the screw shaft 11. The pooling eye 10 is fixed to the support plate 4 by screwing the nut 11A onto the support plate 4. At the other end of the pooling eye 10, as in the case of the pooling eye 6, a hollow recess 10A is formed.
The optical fiber cable passage sub-duct 9 is inserted into A, and the pooling eye 10 is compressed to fixedly attach the optical fiber cable passage sub-duct 9 in the recess 10A.

However, as described above, since the sub-duct 9 for passing the optical fiber cable is usually a hollow tube made of plastic such as polyethylene, the sub-duct 9 is simply inserted into the recess 10A. , Pooling eye 1
It is not possible to firmly fix it just by compressing 0. Therefore, according to the present invention, the reinforcing rod 13 is inserted into the end portion of the optical fiber cable passage sub-duct 9, that is, the portion corresponding to the recess 10A of the pooling eye 10.
As a result, when the pooling eye 10 is compressed, the sub-duct 9 and the reinforcing rod 13 are compressed by the pooling eye 10, and the sub-duct 9 is firmly fixed together with the reinforcing rod 13 in the recess 10A. The reinforcing rod 13 may be made of aluminum, copper, or any other metal material,
Alternatively, it may be a plastic material.

As described above, since the optical / power composite cable used in this embodiment is the triplex type power cable as shown in FIG. 3, the power cable core is as shown in FIG. Three pooling eyes 6 for fixing the conductors 8A of 8 are provided, and three pooling eyes 10 for holding the sub-duct 9 for passing the optical fiber cable are also provided. The pooling eyes 6 and 10 are attached to the support plate 4 and simultaneously pulled by a tow rope.

Therefore, in practicing the present invention, when the cable is pulled through the wire cap 1, the conductor 8A of the power cable core 8 is pulled and the optical fiber cable sub-duct 9 is also pulled. Therefore, the sub-duct 9 does not slide with respect to the outer periphery of the power cable core 8, that is, the surface of the sheath 8C, and the position does not shift in the longitudinal direction.

In the above embodiment, the optical / electric power composite cable having the three power cable cores 8 and the three sub-ducts 9 has been described.
A person skilled in the art can easily understand that the power composite cable is also applicable.

[0016]

As described above in detail, the method of extending the optical / electrical power composite cable of the present invention has a structure in which the optical fiber cable sub-duct is also pulled together with the conductor of the power cable core through the pooling eye. As a result, the sub-duct does not slide along the outer peripheral surface of the core of the power cable during the wire-drawing work, and its position does not shift in the longitudinal direction. Have.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional side view of a pooling device for explaining a method for extending an optical / power composite cable of the present invention.

2 is a cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view of an example of an optical / power composite cable.

[Explanation of symbols]

 1 Extended wire cap 4 Support plate 6 and 10 Pooling eye 8A Conductor 9 Sub duct 13 Reinforcing rod

Claims (1)

Claim: What is claimed is: 1. A method of extending an optical / power composite cable, comprising a power cable core and an optical fiber conduit sub-duct twisted together, and a conductor at a terminal of the power cable core. Is fixed to the pooling eye, and at the same time, a reinforcing rod is inserted inside the end of the optical fiber passage sub-duct, and then the end of the optical fiber passage sub-duct is fixed to another pooling eye, and each of the pooling eyes is inserted. A method of extending an optical / electrical power composite cable, wherein each of the power cable cores and the sub-duct for optical fiber passage are pulled at the same time.