JP7222786B2 - Intermediate connection part of optical composite power cable and method of forming intermediate connection part of optical composite power cable - Google Patents

Description

The present invention relates to an intermediate connection portion of an optical composite power cable and a method of forming an intermediate connection portion of an optical composite power cable.

The metal shielding layer of one power cable (hereinafter referred to as the first power cable) and the metal shielding layer of the other power cable (hereinafter referred to as the second power cable) are used as intermediate connections for connecting the power cables. An intermediate connector having an edge cut for electrical disconnection without connection is known (see, for example, Patent Document 1).
That is, in such an intermediate connection portion 100, as shown in FIG. 9, for example, the central conductors 111 and 121 of the step-stripped first power cable 110 and second power cable 120 are electrically and mechanically connected by the connecting member 130. , the central conductors 111 and 121, the connecting member 130, the insulating layer 112 of the first power cable 110, the insulating layer 122 of the second power cable 120, etc. are covered with a rubber unit insulator 131 which is a reinforcing insulating layer. there is

An external semi-conductive layer 133 is formed on the outer peripheral surface of the rubber unit insulator 131. A gap is provided in the external semi-conductive layer 133 in the longitudinal direction of the intermediate connection portion 100, and this portion is a border cut portion 133A. It is said that
Therefore, the outer semi-conductive layer 133 is connected to the metal shielding layer 115 of the first power cable 110 and the metal shielding layer 125 of the second power cable 120, respectively, but the outer semi-conductive layer 133 is provided with an edge cut portion 133A. Therefore, each metal shield layer 115, 125 of each cable is electrically isolated.

In the intermediate connection portion 100, a conductive pipe member 134 such as a copper pipe is arranged outside the outer semi-conductive layer 133, and a compound 135 is filled between the outer semi-conductive layer 133 and the pipe member 134. ing.
The conductive tube member 134 is connected to the metal shielding layer 115 of the first power cable 110 and the metal shielding layer 125 of the second power cable 120, respectively. Therefore, each metal shielding layer 115, 125 of each cable is also electrically separated at tube member 134. FIG.

On the other hand, power cables include optical composite power cables in which optical fibers are combined. For example, an optical composite power cable is known in which a stainless steel pipe containing an optical fiber is arranged in a metal shielding layer portion of the power cable. When such optical composite power cables are connected to each other at an intermediate connection portion, it is necessary to connect the central conductors of the optical composite power cables together as described above, and also to connect the optical fibers.
Therefore, Patent Documents 2 to 4, for example, propose a method in which an optical fiber or a stainless steel pipe is pulled out from a pipe member (connection box) and connected outside the pipe member.

Japanese Patent Application Laid-Open No. 2010-4590 Japanese Patent No. 2764666 JP-A-8-223765 Japanese Patent No. 4690821

By the way, when such composite optical power cables are connected to each other by an intermediate connection portion having a cut edge portion as shown in FIG. It is desirable to
However, in the methods of connecting the optical fibers described in Patent Documents 2 to 4, metal pipes such as stainless steel pipes housing the optical fibers are not electrically separated from each other, or the separation is insufficient. When an abnormally high voltage such as a lightning surge occurs, electrical discharge may occur between the metal tubes of the optical fiber. Therefore, the methods described in Patent Documents 2 to 4 cannot be adopted as a method for connecting optical fibers in a pipe member of an intermediate connection portion having an edge cut portion as shown in FIG. 9, for example.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. It is an object of the present invention to provide an intermediate connection portion of a connectable optical composite power cable and a method of forming the intermediate connection portion of the optical composite power cable.

In order to solve the above problem, the invention according to claim 1,
An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
The spacing member is attached to the case,
The optical fiber connecting portion is made of an insulating material except for the first metal tube and the second metal tube .

The invention according to claim 6 is the intermediate connection part of the optical composite power cable according to claim 1, 3, 4 or 5 ,
both ends of the spacing member are provided with holding portions for holding the tip portions,
The holding part is characterized by comprising a stopper that restricts movement of the ends of the first and second metal pipes in a direction in which the ends approach each other.

The invention according to claim 2 ,
An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance;
both ends of the spacing member are provided with holding portions for holding the tip portions,
The holding part includes a stopper that restricts movement of the tips of the first and second metal tubes in a direction in which the tips approach each other,
The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
The holding portion and the stopper are integrally formed with the case, and the case is configured to function as the spacing member,
The optical fiber connecting portion is made of an insulating material except for the first metal tube and the second metal tube .

The invention according to claim 7 is the intermediate connection part of the optical composite power cable according to claim 2 or claim 6 ,
The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
The holding portion and the stopper are attached to the case, and the case is configured to function as the spacing member.

The invention according to claim 3 ,
An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance;
Inclined portions are provided at both ends of the reinforcing insulating layer,
an outer semi-conductive layer connected to the metal shielding layer of the first optical composite power cable and the metal shielding layer of the second optical composite power cable is formed on the outer peripheral surface of the reinforcing insulating layer,
At one of the inclined portions, the outer semi-conductive layer is provided with an edge cut,
The optical fiber connecting portion is arranged to face the one inclined portion .
The invention according to claim 4,
An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance;
Inclined portions are provided at both ends of the reinforcing insulating layer,
The tubular member is provided with an edge cut,
The edge cut portion of the pipe member and the optical fiber connecting portion are arranged to face the one inclined portion .

The invention according to claim 8 is the intermediate connection part of the optical composite power cable according to any one of claims 1 to 7 , wherein the tube member is provided with an edge cut part. and

The invention according to claim 5 ,
An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance;
The outer semiconductive layer formed on the outer peripheral surface of the reinforcing insulating layer and connected to the metal shielding layer of the first optical composite power cable and the metal shielding layer of the second optical composite power cable is provided with a cut edge. and
The optical fiber connecting portion is arranged in the vicinity of the edge cut portion of the outer semi-conductive layer.

The invention according to claim 9 is the intermediate connection part of the optical composite power cable according to any one of claims 1 to 8 , wherein the connected optical fibers are provided with an insulating sheet together with the optical fiber connection part. characterized by being coated with

The invention according to claim 10 ,
A forming method for forming an intermediate connection portion of an optical composite power cable according to any one of claims 1 to 9 ,
a step of connecting the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable, and covering the connecting portion between the central conductors with the reinforcing insulating layer;
Outside the reinforcing insulating layer, the ends of the first metal tube and the second metal tube that accommodate the optical fiber of the first optical composite power cable and the optical fiber of the second optical composite power cable are placed at predetermined positions. holding on the spacing member so as to be spaced apart by a distance of
connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable at the optical fiber connecting portion;
placing a conductive tube member outside the reinforcing insulating layer;
and filling a region between the reinforcing insulating layer and the tubular member with a compound.

According to the present invention, the optical fiber connecting portion disposed in the region between the pipe member of the intermediate connecting portion for connecting the optical composite power cable and the reinforcing insulating layer, the optical fiber of the first optical composite power cable and the first optical fiber connecting portion. Since the optical fibers are connected to each other while the tips of the first metal tube and the second metal tube of the optical fiber of the optical composite power cable are separated by a predetermined distance, , the optical fibers can be connected to each other while the metal tubes of the optical fibers are properly electrically disconnected.

FIG. 3 is a half-cut side view showing an intermediate connection portion of the composite optical power cable according to the present embodiment; It is a partial cross-sectional plan view showing the basic configuration of the optical fiber connection portion according to the present embodiment. It is a partial cross-sectional plan view showing the structural example of an optical fiber connection part. FIG. 4 is a perspective view showing a configuration example of an optical fiber connection section in which a holding section, a stopper, and a spacing member are attached to a case; FIG. 10 is a perspective view showing a configuration example of an optical fiber connecting portion in which a holding portion and a stopper are attached to a case, or in which the holding portion and a stopper are integrally formed with the case; (A) is a diagram showing a state in which an optical fiber connecting portion is placed on an unfolded insulating sheet, and (B) is a diagram showing a state in which the insulating sheet is folded so as to wrap the optical fiber connecting portion. 4A to 4C are half cross-sectional views for explaining each step in the method for forming an intermediate connection portion of the composite optical power cable; FIG. 4A to 4C are half cross-sectional views for explaining each step in the method for forming an intermediate connection portion of the composite optical power cable; FIG. FIG. 4 is a half-cut side view showing a configuration example of an intermediate connector having edge cuts;

Hereinafter, an intermediate connection portion of an optical composite power cable and a method of forming an intermediate connection portion of an optical composite power cable according to the present embodiment will be described with reference to the drawings. However, although various technically preferable limitations are attached to the embodiments described below in order to carry out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.

FIG. 1 is a diagram showing the configuration of an intermediate connection portion of an optical composite power cable according to this embodiment.
The intermediate connection portion 1 of the optical composite power cable (hereinafter simply referred to as the intermediate connection portion 1) consists of the central conductor 11 of one optical composite power cable 10 (hereinafter referred to as the first optical composite power cable 10) and the other While connecting the center conductor 21 of the optical composite power cable 20 (hereinafter referred to as the second optical composite power cable 20), the optical fiber 17 of the first optical composite power cable 10 and the second optical composite power cable It is also used to connect 20 optical fibers 27 .

The first optical composite power cable 10 includes, for example, a central conductor 11 made of copper wire or the like, an insulating layer 12 covering the central conductor 11 via an internal semiconducting layer (not shown), and an external semiconducting layer covering the insulating layer 12. 13 , a tape layer 14 covering the outer semi-conductive layer 13 , a metal shielding layer 15 covering the tape layer 14 , and an insulating sheath 16 covering the metal shielding layer 15 .
Similarly, the second optical composite power cable 20 includes, for example, a central conductor 21, an insulating layer 22 covering the central conductor 21 via an inner semiconducting layer (not shown), and an outer semiconducting layer 23 covering the insulating layer 22. , a tape layer 24 covering the outer semi-conductive layer 23 , a metal shielding layer 25 covering the tape layer 24 , and an insulating sheath 26 covering the metal shielding layer 25 .
The optical fibers 17 and 27 are arranged in the metal shielding layer 15 of the first optical composite power cable 10 and the metal shielding layer 25 of the second optical composite power cable 20, respectively, but this point will be described later. do.

The first composite optical power cable 10 and the second composite optical power cable 20 are each stripped in the intermediate connection part 1, and each layer such as the central conductors 11 and 21 and the insulating layers 12 and 22 is predetermined. are exposed in increments of length.
The central conductor 11 of the first composite optical power cable 10 and the central conductor 21 of the second composite optical power cable 20 are electrically and mechanically connected by a connecting member 30 such as a conductive connecting tube.

The central conductors 11, 21, the connecting member 30, and the insulating layers 12, 22 are covered with an electrically insulating rubber unit insulator 31. In this embodiment, the first optical composite power A connecting portion between the center conductors 11 and 21 of the cable 10 and the second optical composite power cable 20 is covered with a rubber unit insulator 31 which is a reinforcing insulating layer.
An internal semi-conductive layer (internal electrode) 32 is provided inside the rubber unit insulator 31 around the central conductors 11 and 21 and the connection member 30 . The inner semiconductive layer 32 is formed by cylindrically molding semiconductive rubber mixed with carbon, for example. Moreover, a necessary structure such as a stress cone is appropriately provided in the rubber unit insulator 31 .

An outer semi-conductive layer 33 is formed on the outer peripheral surface of the rubber unit insulator 31 . One end in the longitudinal direction of the external semi-conductive layer 33 is connected to the metal shielding layer 15 of the first optical composite power cable 10, and the other end in the longitudinal direction of the external semi-conductive layer 33 is connected to the second light. It is connected to the metal shield layer 25 of the composite power cable 20 . The outer semi-conductive layer 33 is formed by spraying semi-conductive paint containing carbon, for example, on the outer peripheral surface of the rubber unit insulator 31 .
In the present embodiment, the outer semi-conductive layer 33 has a gap in the longitudinal direction, and this portion serves as the edge cut portion 33A. The metal shielding layer 15 of the first composite optical power cable 10 and the metal shielding layer 25 of the second composite optical power cable 20 are electrically separated from each other because they are provided along the entire circumference of the surface.

A conductive tube member 34 made of a copper tube or the like is arranged outside the rubber unit insulator 31 and the external semi-conductive layer 33 . One longitudinal end of the tube member 34 is connected to the metal shielding layer 15 of the first optical composite power cable 10 , and the other longitudinal end of the tube member 34 is connected to the second optical composite power cable 20 . is connected to the metal shield layer 25 of
In this embodiment, a part of the pipe member 34 is cut off, and a cut-off portion 34A is provided over the entire circumference of the pipe member 34 by, for example, fitting a resin cylindrical body into the cut portion. Therefore, like the external semiconductive layer 33, the metal shielding layer 15 of the first optical composite power cable 10 and the metal shielding layer 25 of the second optical composite power cable 20 are electrically separated in the tube member 34 as well. there is

A region R between the rubber unit insulator 31 and the pipe member 34 is filled with a compound 35 .
In the present invention, an optical fiber connecting portion 40 for connecting the optical fiber 17 of the first composite optical power cable 10 and the optical fiber 27 of the second composite optical power cable 20 is arranged in this region R. .
In the following, a detailed description will be given of the configuration and the like related to the optical fiber in the present invention, including the optical fiber connecting portion 40. FIG.

In the first optical composite power cable 10, one or a plurality of optical fibers 17 are accommodated in a first metal tube 18 such as a stainless steel tube (hereinafter simply referred to as the metal tube 18). are embedded within the metal shield layer 15 or disposed within the cable along the inside or outside of the metal shield layer 15 . The same applies to the optical fiber 27 of the second optical composite power cable 20 and the first metal tube 28 (hereinafter simply referred to as the metal tube 28).
In the intermediate connection portion 1, the metal tubes 18 and 28 are pulled out into the region R from the step-stripped metal shielding layers 15 and 25 of the first composite optical power cable 10 and the second composite optical power cable 20, respectively. and pulled around in the longitudinal direction of the intermediate connection portion 1 .

At that time, the optical fibers 17 and 27 are accommodated so that the optical fibers 17 and 27 and the metal tubes 18 and 28 have extra lengths in case the optical fibers 17 and 27 are reconnected. It is desirable to wind the metal tubes 18 and 28 along the outer periphery of the rubber unit insulator 31 and the outer semi-conductive layer 33 in a direction substantially orthogonal to the longitudinal direction of the intermediate connection portion 1 .
Also, if the optical fibers 17 and 27 are taken out from the metal tubes 18 and 28 and only the optical fibers 17 and 27 are routed within the region R, the optical fibers 17 and 27 may be crushed by the compound 35 or the melted compound 35 may be injected. Since there is a possibility that the connection between the optical fibers 17 and 27 may be cut off when doing so, it is desirable to route the optical fibers 17 and 27 in the metal tubes 18 and 28 as much as possible within the region R.

On the other hand, in the present embodiment, the outer semi-conductive layer 33 and the conductive tube member 34 are cut off by the cut-off portions 33A and 34A, respectively, as described above. If the distance between the metal tube 18 of the second optical composite power cable 20 and the metal tube 28 of the optical fiber 27 on the second optical composite power cable 20 side is too close, the metal tubes 18 and 28 will not be connected to each other when an abnormally high voltage such as a lightning surge occurs. Discharge occurs between them, and the separation between the metal shielding layers 15 and 25 of the first optical composite power cable 10 and the second optical composite power cable 20 is no longer established.
Therefore, in the present invention, the optical fiber connecting portion 40 is arranged in this region R, and the optical fibers 17, 27 are connected in a state in which the metal tubes 18, 28 of the optical fibers 17, 27 are appropriately electrically separated (that is, cut off). 27 are connected.
A specific description will be given below.

FIG. 2 is a partially cross-sectional plan view showing the basic configuration of the optical fiber connecting portion 40 according to this embodiment. The optical fiber connecting portion 40 includes a metal tube 18 that accommodates the optical fiber 17 of the first composite optical power cable 10, a metal tube 28 that accommodates the optical fiber 27 of the second composite optical power cable 20, the first and A separation member 41 is provided to hold the tip portions of the first metal tube 18 and the second metal tube 28 so that the tips of the second metal tubes 18 and 28 are separated from each other by a predetermined distance.

At this time, the spacing member 41 is provided with holding portions 42, 42 on both sides, and the metal pipes 18, 28 are inserted through the through-holes 43a, 43a provided in the holding portions 42, 42 by, for example, adhesion or press-fitting and fixed. It is designed to be With this configuration, deformation of the spacing member 41 and displacement of the metal pipes 18 and 28 are prevented, and even when the compound 35 is filled as described later, the ends of the metal pipes 18 and 28 are kept in contact with each other. A state in which they are separated by a predetermined distance is maintained. In addition, as shown in FIG. 4 and subsequent figures, it is preferable to provide a portion (a case 44 in FIG. 4 and subsequent figures) for housing the connecting portion of the optical fibers 17 and 27 .
In addition, in the configuration shown in FIG. 2, the through holes 43a, 43a function as a stopper 43, which will be described later.

Configuration examples obtained by variously modifying the basic configurations of the optical fiber connecting portion 40 and the spacing member 41 will be described below.
FIG. 3 is a partially cross-sectional plan view showing a configuration example of an optical fiber connecting portion. The spacing member 41 has holding portions 42, 42 at both ends thereof for holding the tip portions of the metal tubes 18, 28, respectively. A stopper 43 is provided to restrict movement in the direction.
Holes 42a each having a diameter slightly larger than the outer diameter of the metal tubes 18, 28 of the optical fibers 17, 27 are drilled in the holding portion 42 up to midway inside the solid material. Holes 42b having a smaller diameter than the outer diameters of the metal tubes 18, 28 of the optical fibers 17, 27 are bored through the solid material.

When the metal tube 18 is inserted into the large-diameter hole 42a of the holding part 42, the metal tube 18 hits the wall 43b at the deepest part of the hole 42a (that is, the part where the hole 42a is switched to the hole 42b). No more can be inserted. Similarly, when the metal tube 28 is inserted into the large-diameter hole 42a of the other holding portion 42, the metal tube 28 abuts against the wall 43b at the innermost portion of the hole 42a and cannot be inserted any further.
The two holding portions 42, 42 are arranged such that the openings of the small-diameter holes 42b are opposed to each other, and the inner walls 43b, 43b of the holding portions 42, 42 are formed by the stopper 43, respectively. It has become.

Metal pipes 18, 28 inserted into large-diameter holes 42a, 42a of the holding portions 42, 42 are tightened in a direction orthogonal to the insertion direction so that the metal pipes 18, 28 do not slip out of the holes 42a. Screws 43c, 43c for fixing are provided respectively. The screws 43c, 43c also function as the stopper 43, respectively. The screw 43c alone without the wall 43b functions as the stopper 43 described above.
The holding part 42 fastens and fixes the metal tubes 18, 28 inserted into the large-diameter holes 42a with the screws 43c, so that the metal tubes 18 that accommodate the optical fibers 17 of the first optical composite power cable 10 are held. The tip portion and the tip portion of the metal tube 28 accommodating the optical fiber 27 of the second optical composite power cable 20 are held respectively.

3 shows a case where two screws 43c are provided for each holding portion 42 in order to tighten the metal pipes 18 and 28 from both sides, respectively. It is also possible to provide one by one and configure the metal tubes 18 and 28 to be tightened from one side respectively.
Further, instead of forming the stopper 43 in the holding portion 42 as described above, the holding portion 42 and the stopper 43 can be formed separately.

The holding portions 42, 42 are fixed to both ends of the rod-shaped spacing member 41 with screws or the like. By fixing the holding portions 42 and 42 to both ends of the spacing member 41 , the spacing member 41 separates the optical fiber 17 of the first optical composite power cable 10 and the optical fiber 27 of the second optical composite power cable 20 . are held in such a manner that the tips of the metal tubes 18, 28 are spaced apart from each other by a predetermined distance.
Further, when the holding portion 42 and the stopper 43 are separately formed as described above, the stopper 43 is also configured to be fixed at a predetermined position of the spacing member 41 .

The "predetermined distance" between the ends of the metal tubes 18 and 28 in the optical fiber connecting portion 40 is the standard (standard ) can be set based on the same criteria (standards).
It is also possible to integrally form the holding portions 42, 42 and the spacing member 41 (or the stopper 43 and the spacing member 41, or the holding portions 42, 42, the stopper 43 and the spacing member 41).

Each part constituting the optical fiber connecting part 40, that is, the holding part 42, the stopper 43, the spacing member 41, and other screws, etc., should be made of fiber reinforced plastic (FRP), epoxy resin, acrylic resin, etc. in order to provide insulation. is desirable. Also, some or all of them may be made of ceramic or the like.
In actual work, one or more optical fibers 17 pulled out from the metal tube 18 are inserted into the large-diameter hole 42a and the small-diameter hole 42b of one of the holding portions 42 fixed to the spacing member 41. The metal pipe 18 is attached to the holding portion 42 by tightening the screw 43c. Similarly, the metal tube 28 is attached to the holding portion 42 while the optical fiber 27 is inserted through the other holding portion 42 . In this state, the optical fibers 17 and 27 are connected to each other.

2 and 3, the ends of the metal tubes 18 and 28 are held apart from each other by a predetermined distance. It is more preferable to have For example, as shown in FIG. 2, the metal tubes 18 and 28 are press-fitted so as to be insertable and removable from the through holes 43a and 43a provided in the holding portion 42, respectively, while restricting the movement in the direction in which the metal tubes 18 and 28 approach each other. Alternatively, as shown in FIG. 3, the metal pipes 18 and 28 are abutted against the wall 43b provided by the holes 42a and 42b with different diameters, and the metal pipes 18 and 28 are fastened and fixed to the large diameter hole 42a with screws 43c. It is possible to allow insertion and removal while restricting the movement in the approaching direction so that the tips of the metal tubes 18 and 28 are separated from each other by a predetermined distance.

With the above configuration, when the optical fibers 17 and 27 are connected, or after the optical fiber connection portion 40 is accommodated in the intermediate connection portion 1 to form the intermediate connection portion 1, the optical fibers 17 and 27 are connected. , metal tubes 18, 28 by injecting compound 35 into region R between rubber unit insulator 31 and tube member 34, and bending first and second optical composite power cables 10, 20. Even if a force is applied to bring the optical fibers 17 and 27 closer to each other, the spacing member 41 of the optical fiber connection section 40 keeps the tip portions of the metal tubes 18 and 28 accommodating the optical fibers 17 and 27 in the tip ends of the metal tubes 18 and 28. Since the tips are kept apart from each other by a predetermined distance, movement in the direction in which the tips approach each other is restricted.

That is, even if a force is applied, the metal pipes 18 and 28 are separated by the separating member 41 and therefore do not move in the direction in which the tip portions approach.
Therefore, in the intermediate connection portion 1 of the optical composite power cable according to the present invention, even if a force is applied to bring the metal tubes 18 and 28 closer together, the tips of the metal tubes 18 and 28 do not approach each other, and the metal tubes 18 and 28 do not approach each other. The distance between the tips of the tubes 18, 28 is maintained at a constant distance with a predetermined distance between them.

In the present invention, in this manner, the metal tubes 18 and 28 of the optical fibers 17 and 27 are positioned and fixed in a state separated by a predetermined distance by the optical fiber connecting portion 40, and are in an electrically disconnected state. . The optical fibers 17 and 27 are connected while the metal tubes 18 and 28 are electrically disconnected in this way.
Therefore, even if an abnormally high voltage such as a lightning surge occurs, it is possible to reliably prevent a situation such as a discharge occurring between the metal tubes 18 and 28 of the optical fibers 17 and 27 .

By the way, in the present invention, as described above, the ends of the metal tubes 18 and 28 of the optical fibers 17 and 27 are regulated at the optical fiber connection portion 40 so as not to come closer than a predetermined distance. However, if the metal tubes 18 and 28 are closer to each other than the predetermined distance at a portion other than the tip (that is, other than the optical fiber connection portion 40), for example, when an abnormally high voltage such as a lightning surge occurs, Discharge may occur at that portion.
Therefore, in the present invention, as shown in FIG. 1, the tip portions of the metal tubes 18 and 28 of the optical fibers 17 and 27 are the closest to each other and are kept at a predetermined distance at which no discharge occurs. It is desirable to be held by the spacing member 41 at .

Also, as shown in FIG. 1, within the intermediate connection 1, the metal tubes 18, 28 of the optical fibers 17, 27 are arranged in close proximity to the outer semi-conductive layer 33. As shown in FIG. At that time, if the optical fiber connection portion 40 is arranged at a position away from the edge cut portion 33A of the external semi-conductive layer 33 (for example, the position on the right side in the figure in the intermediate connection portion 1), the edge cut portion 33A cuts the edge. There is a possibility that the external semiconductive layer 33, which should be there, may be electrically connected through the metal tube 18 or the metal tube 28 arranged in the edge cut portion 33A.
If the cut-off outer semi-conductive layer 33 is electrically connected through the metal tube 18 or the metal tube 28, cutting off the cut-off portion 33A of the outer semi-conductive layer 33 becomes meaningless.

Therefore, it is desirable that the optical fiber connection portion 40 be arranged in the vicinity of the edge cut portion 33</b>A of the outer semiconductive layer 33 in the intermediate connection portion 1 .
Specifically, the ends of the pipe member 34, the outer semi-conductive layer 33, and the metal pipe 18 on the one end side which are edge-cut are the ends of the pipe member 34, the outer semi-conductive layer 33, and the metal pipe 28 on the other end side. It is preferable that the edge cut portions 33A, 34A and the optical fiber connection portion 40 are arranged so as to be separated from each of the portions by a predetermined distance. By doing so, it is possible to more reliably prevent discharge even when an abnormally high voltage such as a lightning surge occurs.

Moreover, it is more preferable to do as follows. As shown in FIG. 1, the rubber unit insulator 31 has truncated conical slopes on both sides of the optical composite power cables 10 and 20 along the central axis of the optical composite power cables 10 and 20 . 33 A of edge cutting parts are provided in the inclination part of one side (optical composite power cable 10 side). Further, the edge cut portion 34A of the pipe member 34 is also provided on the same side (optical composite power cable 10 side). The optical fiber connecting portion 40 is arranged along the edge cut portion 33A.

Furthermore, it is more preferable to do as follows. As shown in FIG. 1, the tube member 34 is provided with truncated conical inclined portions on both sides of the optical composite power cables 10 and 20 along the central axis of the optical composite power cables 10 and 20. , and an edge cut portion 34A is provided on one inclined portion (optical composite power cable 10 side). The optical fiber connecting portion 40 is arranged so as to be sandwiched between the edge cut portion 33A and the edge cut portion 34A. By doing so, even when an abnormally high voltage such as a lightning surge occurs, discharge can be prevented more reliably, and the amount of waterproof compound 35 used can be reduced.

In FIG. 1, the tube member 34 is also provided with truncated conical inclined portions on both sides of the optical composite power cables 10 and 20 along the central axes of the optical composite power cables 10 and 20. However, the pipe member 34 as a whole may have a cylindrical shape without an inclined portion.
In this way, the outer semi-conductive layer 33 cut off by the cut-off portion 33A is positioned so as not to be electrically connected via the metal tube 18 or the metal tube 28 attached to the optical fiber connection portion 40. It is desirable that the optical fiber connecting portion 40 is arranged at the .

As described above, according to the intermediate connection portion 1 of the optical composite power cable according to the present embodiment, the optical fiber connection portion 40 is arranged in the region R between the outer semiconductive layer 33 and the conductive pipe member 34, The optical fibers 17 and 27 are connected to each other at the optical fiber connecting portion 40 .
Therefore, it is possible to appropriately connect the optical fibers 17 and 27 inside the tube member 34 of the intermediate connection portion 1 .

The ends of the metal tubes 18, 28 accommodating the optical fibers 17, 27 are held apart by a predetermined distance by the spacing member 41 of the optical fiber connecting portion 40, and the optical fibers 17, 27 are held in this state. , the optical fibers 17 and 27 can be connected in a state in which the metal tubes 18 and 28 are properly electrically disconnected (that is, in a disconnected state) at the optical fiber connection portion 40 .
Therefore, if the metal tubes 18, 28 housing the optical fibers 17, 27 are not electrically separated from each other or the separation is insufficient, when an abnormally high voltage such as a lightning surge occurs, the metal tube 18 will , 28 can be reliably prevented from occurring.

The connection of the optical fibers 17 and 27 in the optical fiber connection section 40 is not limited to a specific connection method. Also, when connecting the optical fibers 17 and 27 at the optical fiber connecting portion 40, the optical fibers 17 and 27 are connected so as to have an extra length, or when there are a plurality of optical fibers 17 and 27 each, the connection Processing necessary for connecting the optical fibers at the intermediate connection portion, such as making the remaining lengths of the optical fibers 17 and 27 the same for each of the optical fibers 17 and 27, is appropriately performed.
A plurality of metal tubes 18, 28 of the optical fibers 17, 27 are arranged in the metal shielding layer 15 of the first optical composite power cable 10 and the metal shielding layer 25 of the second optical composite power cable 20, respectively. If there is, the optical fiber connection part 40 is provided in the area R corresponding to the number of metal tubes 18 (metal tubes 28). When a plurality of optical fiber connection portions 40 are provided in this manner, the plurality of optical fiber connection portions 40 are arranged, for example, around the outer semi-conductive layer 33 (around the edge cut portion 33A).

On the other hand, as shown in FIG. 2, if the optical fibers 17 and 27 are exposed at the optical fiber connection portion 40, the optical fibers 17 and 27 may be crushed by the compound 35 or the melted compound 35 may be injected. In some cases, the connection between the optical fibers 17 and 27 may be cut off.
In such a case, it is desirable to configure the optical fiber connecting portion 40 to include a case 44 that accommodates the optical fibers 17, 27 exposed from the metal tubes 18, 28 and connected.

At this time, if the case 44 is formed separately from the holding portion 42, the stopper 43, and the spacing member 41, as shown in FIG. It is preferably configured to attach to 44.
In this case, the holding part 42 and the like can be attached to the case 44 by fixing the holding part 42 to the case 44 or by fixing the two upper and lower spacing members 41 to the case 44 . Although FIG. 4 shows the case where the holding portion 42 and the like are attached to the outside of the case 44 , it is also possible to attach the holding portion 42 and the like inside the case 44 .

Further, as shown in FIG. 5, for example, the holding portion 42 and the stopper 43 may be attached to the case 44, or the holding portion 42 and the stopper 43 may be integrally formed with the case 44.
In these cases, the case 44 is configured to function as the spacing member 41 described above. Therefore, the case 44 is designed to have a size and length such that the tips of the metal tubes 18 and 28 that accommodate the optical fibers 17 and 27 are separated from each other by a predetermined distance.

4 and 5, when the optical fiber connection portion 40 has a case 44, the optical fibers 17 and 27 connected by the optical fiber connection portion 40 should be covered with an insulating sheet together with the optical fiber connection portion 40. can be done. 2 and 3, when the optical fiber connecting portion 40 does not have the case 44, the optical fibers 17, 27 and the like can be covered with an insulating sheet such as a protective tube.
In this case, for example, as shown in FIG. 6A, the optical fiber connection section 40 including the optical fibers 17 and 27 is placed on the spread insulating sheet 45, and as shown in FIG. By folding the insulating sheet 45 so as to wrap the fiber connecting portion 40 , the optical fibers 17 and 27 can be covered with the insulating sheet 45 together with the optical fiber connecting portion 40 .
By configuring in this way, it is possible to prevent the compound 35 (see FIG. 1) from entering the optical fiber connecting portion 40 .

A method for forming an intermediate connection portion of an optical composite power cable according to the present invention will be described below.
As shown in FIG. 7A, first, the first composite optical power cable 10 and the second composite optical power cable 20 are stripped. At this point, the metal tubes 18 and 28 of the optical fibers 17 and 27 are pulled out from the step-stripped metal shielding layers 15 and 25 of the first composite optical power cable 10 and the second composite optical power cable 20, respectively.
Subsequently, the central conductor 11 of the first composite optical power cable 10 and the central conductor 21 of the second composite optical power cable 20 are electrically and mechanically connected by a connecting member 30 such as a conductive connecting tube. Then, as shown in FIG. 7B, the connecting portion between the central conductors 11 and 21 is covered with a rubber unit insulator 31 as a reinforcing insulating layer.

Before the central conductor 11 of the first composite optical power cable 10 and the central conductor 21 of the second composite optical power cable 20 are connected, the rubber unit is in a state in which the inner diameter is expanded in advance by a diameter expansion holding member (not shown). The insulator 31 is passed through either the first optical composite power cable 10 or the second optical composite power cable 20 .
Then, after connecting the central conductor 11 of the first optical composite power cable 10 and the central conductor 21 of the second optical composite power cable 20, the diameter-expanded rubber unit insulator 31 is used to connect the central conductors 11 and 21 to each other. By removing the diameter expansion holding member, the rubber unit insulator 31 is in close contact with the connecting portion between the central conductors 11 and 21, and the connecting portion between the central conductors 11 and 21 is the rubber unit insulator 31. covered.

Further, in this embodiment, the internal semi-conductive layer (internal electrode) 32 and the external semi-conductive layer 33 having the edge cut portion 33A are formed in advance on the inner peripheral surface and the outer peripheral surface of the rubber unit insulator 31. When the connecting portion between the central conductors 11 and 21 is covered with the rubber unit insulator 31 as described above, the inner semiconductive layer 32 and the outer semiconductive layer 33 (and the edge cut portion 33A) are arranged at predetermined positions. be.
At that time, if necessary, one longitudinal end of the outer semi-conductive layer 33 is connected to the metal shielding layer 15 of the first optical composite power cable 10, and the other end is connected to the second optical composite power cable 20. It is connected to the metal shield layer 25 . Alternatively, a conductive tape, a metal mesh tape, or the like may be wrapped around the external semi-conductive layer 33 .

Subsequently, the metal tubes 18, 28 of the optical fibers 17, 27 pulled out from the metal shielding layer 15 of the first optical composite power cable 10 and the metal shielding layer 25 of the second optical composite power cable 20 are extended to the excess length. In order to hold the rubber unit insulator 31 and the outer semi-conductive layer 33, they are wound in a direction substantially perpendicular to the longitudinal direction of the intermediate connection portion 1, for example.
Then, the metal pipes 18 and 28 are routed along the outer periphery of the outer semi-conductive layer 33 to the edge cut portion 33A of the outer semi-conductive layer 33 .

Subsequently, as shown in FIG. 8A, outside the rubber unit insulator 31, the ends of the respective metal tubes 18 and 28 are held by the spacing member 41 so as to be spaced apart by a predetermined distance.
Specifically, the metal pipe of the optical fiber 17 is inserted into the through hole 43a of one holding portion 42 of the holding portions 42 at both ends of the spacing member 41 of the optical fiber connecting portion 40 (see FIG. 2) formed in advance (see FIG. 2). 18 is inserted and fixed by gluing or press-fitting. Similarly, the metal tube 28 of the optical fiber 27 is inserted into the through hole 43a of the other holding portion 42 and fixed by bonding or press-fitting.
Alternatively, the hole 42a of one holding portion 42 of the holding portions 42 on both ends of the spacing member 41 of the optical fiber connection portion 40 (see FIGS. 3 to 5) formed in advance or formed on site, The optical fiber 17 is inserted through 42b, and the metal tube 18 is inserted into the hole 42a and fixed by screwing. Similarly, the optical fiber 27 is inserted through the holes 42a and 42b of the other holding portion 42, and the metal tube 28 is inserted into the hole 42a and fixed by screwing.

Subsequently, the optical fiber 17 of the first composite optical power cable 10 and the optical fiber 27 of the second composite optical power cable 20 are connected by the optical fiber connecting portion 40 .
When the connected optical fibers 17 and 27 are covered with the insulating sheet 45, the optical fiber connecting portion 40 is covered together (see FIGS. 6A and 6B).

Subsequently, as shown in FIG. 8B, a conductive tube member 34 such as a copper tube is arranged outside the rubber unit insulator 31 and the optical fiber connecting portion 40 . At that time, one longitudinal end of the tube member 34 is connected to the metal shielding layer 15 of the first optical composite power cable 10 , and the other longitudinal end of the tube member 34 is connected to the second optical composite power cable 20 . It is connected to the metal shield layer 25 . However, in this embodiment, a portion of the tubular member 34 is cut away.
Then, as shown in FIG. 8(C), an edge cut portion 34A of the pipe member 34 is provided over the entire circumference of the pipe member 34 by, for example, fitting a resin cylindrical body in that portion.
Subsequently, the compound 35 is injected and filled in the region R between the rubber unit insulator 31 and the pipe member 34 .

As described above, the intermediate connection portion 1 of the composite optical power cable according to the present invention is formed.
Therefore, the optical fibers 17 and 27 can be properly connected inside the pipe member 34 of the intermediate connection portion 1, and the optical fiber can be connected to the region R between the outer semi-conductive layer 33 and the conductive pipe member 34. By arranging the connection portion 40 and holding the metal tubes 18 , 28 at the optical fiber connection portion 40 to connect the optical fibers 17 , 27 , the metal pipes 18 , 28 are properly electrically connected at the optical fiber connection portion 40 . It becomes possible to connect the optical fibers 17 and 27 in a separated state (that is, in a cut-off state).
Therefore, the formed intermediate connection portion 1 of the composite optical power cable can appropriately exhibit the beneficial effects described above.

It goes without saying that the present invention is not limited to the above-described embodiments and the like, and can be modified as appropriate without departing from the gist of the present invention.
In the above embodiment, the case where the intermediate connection portion 1 of the optical composite power cable is a type intermediate connection portion having edge cut portions 33A and 34A in the outer semi-conductive layer 33 and the tube member 34 has been described. can also be applied to a type of intermediate connection that does not have such an edge cut, and this case is also included in the present invention.

1 Intermediate Connection Portion of Optical Composite Power Cable 10 First Optical Composite Power Cable 11 Center Conductor 15 Metal Shielding Layer 17 Optical Fiber 18 Metal Tube (First Metal Tube)
20 Second optical composite power cable 21 Central conductor 25 Metal shielding layer 27 Optical fiber 28 Metal tube (second metal tube)
31 rubber unit insulator (reinforcing insulating layer)
33 External semiconductive layer 33A Edge cut portion 34 Tube member 34A Edge cut portion 35 Compound 40 Optical fiber connecting portion 41 Separating member 42 Holding portion 43 Stopper 43a Through hole (stopper)
43b wall (stopper)
43c screw (stopper)
44 Case 45 Insulating sheet R Region between reinforcing insulating layer and pipe member

Claims (10)

An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
The spacing member is attached to the case,
An intermediate connection portion of an optical composite power cable, wherein the optical fiber connection portion is made of an insulating material except for the first metal pipe and the second metal pipe. An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
both ends of the spacing member are provided with holding portions for holding the tip portions,
The holding part includes a stopper that restricts movement of the tips of the first and second metal tubes in a direction in which the tips approach each other,
The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
The holding portion and the stopper are integrally formed with the case, and the case is configured to function as the spacing member,
An intermediate connection portion of an optical composite power cable, wherein the optical fiber connection portion is made of an insulating material except for the first metal pipe and the second metal pipe. An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
Inclined portions are provided at both ends of the reinforcing insulating layer,
an outer semi-conductive layer connected to the metal shielding layer of the first optical composite power cable and the metal shielding layer of the second optical composite power cable is formed on the outer peripheral surface of the reinforcing insulating layer,
At one of the inclined portions, the outer semi-conductive layer is provided with an edge cut,
An intermediate connection portion of an optical composite power cable, wherein the optical fiber connection portion is arranged to face the one inclined portion . An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
Inclined portions are provided at both ends of the reinforcing insulating layer,
The tubular member is provided with an edge cut,
An intermediate connection portion of an optical composite power cable, wherein the edge cut portion of the tube member and the optical fiber connection portion are arranged to face the one inclined portion. An intermediate connection portion of an optical composite power cable that connects the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable,
a reinforcing insulating layer covering the connecting portion between the central conductors;
a conductive pipe member disposed outside the reinforcing insulating layer;
an optical fiber connecting portion arranged in a region between the reinforcing insulating layer and the pipe member, the optical fiber connecting portion connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable; ,
has
The optical fiber connecting portion is
a first metal tube that accommodates the optical fiber of the first optical composite power cable;
a second metal tube that accommodates the optical fiber of the second optical composite power cable;
a spacing member that holds tip portions of the first metal tube and the second metal tube such that the tips of the first and second metal tubes are spaced apart by a predetermined distance ;
The outer semiconductive layer formed on the outer peripheral surface of the reinforcing insulating layer and connected to the metal shielding layer of the first optical composite power cable and the metal shielding layer of the second optical composite power cable is provided with a cut edge. and
An intermediate connection portion of an optical composite power cable, wherein the optical fiber connection portion is arranged in the vicinity of the edge cut portion of the outer semi-conductive layer . both ends of the spacing member are provided with holding portions for holding the tip portions,
6. The apparatus according to claim 1, 3, 4, or 5 , wherein said holding portion comprises a stopper for restricting movement of the tips of said first and second metal pipes in a direction in which said tips approach each other. An intermediate connection portion of the described optical composite power cable. The optical fiber connecting portion includes a case that houses the optical fibers that are exposed and connected from the first and second metal tubes, respectively;
7. The composite optical power cable according to claim 2, wherein the holding portion and the stopper are attached to the case, and the case is configured to function as the spacing member. Intermediate connection. 8. The intermediate connection portion of the optical composite power cable according to claim 1, wherein the tube member is provided with a cut edge portion. 9. The intermediate connecting portion of the optical composite power cable according to claim 1, wherein the connected optical fibers are covered with an insulating sheet together with the optical fiber connecting portion. A forming method for forming an intermediate connection portion of an optical composite power cable according to any one of claims 1 to 9 ,
a step of connecting the central conductor of the first optical composite power cable and the central conductor of the second optical composite power cable, and covering the connecting portion between the central conductors with the reinforcing insulating layer;
Outside the reinforcing insulating layer, the ends of the first metal tube and the second metal tube that accommodate the optical fiber of the first optical composite power cable and the optical fiber of the second optical composite power cable are placed at predetermined positions. holding on the spacing member so as to be spaced apart by a distance of
connecting the optical fiber of the first composite optical power cable and the optical fiber of the second composite optical power cable at the optical fiber connecting portion;
placing a conductive tube member outside the reinforcing insulating layer;
and filling a region between the reinforcing insulating layer and the tubular member with a compound.

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