JPH07114830A - Tube composite cable and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a tube composite cable in which falling in of a tube between main wires is prevented and insertion of a wire into the tube is facilitated and provide a production method thereof. CONSTITUTION:A plurality of tubes 2 are stranded in the same pitch as the stranding pitch of a main wire 1 and in the reverse direction to the stranding direction of the main wire 1 to form a tube wire 3. The tube wires 3 are stranded with the main wires 1 to arrange the tube wires 3 between the main wires 1. A plurality of tubes gathered in the tube wire 3 are unstranded, and each tube 2 forms structure to draw a single layer spiral orbit by using the center of the composite cable as the axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable in which a large-diameter main wire and a tube are combined, such as a power transmission conductor and a copper communication cable, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As conventional technologies, for example, Sumitomo Electric,
No. 136, March 1990, P. 139-146
"Application of ABF method to 66kV power optical composite cable"
An example of a tube composite power cable is described in.
FIG. 3 is a cross-sectional view of a conventional tube composite power cable. In the figure, 1 is a main wire and 2 is a tube. In the tube composite power cable shown in FIG. 3, three outer diameters 56.
A 7 mm main wire 1 (coated 325 mm ² conductor) is twisted together, and a tube 2 having an outer diameter of 16 mm and an inner diameter of 6 mm is arranged in each valley. This tube composite power cable has a capacity of 77kV,
The tube 2 is twisted at the same pitch as the main wire rod 1 to have a spiral shape. An optical fiber can be arranged in the tube 2, for example. For the transmission of the optical fiber to the tube 2, a method using an air flow is described in the above-mentioned document.

However, as the demand for electric power has expanded in recent years,
Power cables with large conductors are being developed and manufactured. For example, in an electric power cable with a capacity of 154 kV, when individual tubes are arranged in the valleys, the tube outer diameter is smaller than that of the main wire. There was a problem that the twist was loosened and the tube entered the valley where the main wire was open and was crushed, and the function of the conduit was lost. It has been considered to arrange a plurality of tubes independent of each other in order to effectively utilize the gap between the valleys as the conductor becomes larger, but the problem that the tubes are crushed similarly occurs.

On the other hand, when a plurality of tubes are twisted together to form a tube wire and the outer diameter thereof is about twice that of the single tube, the above-mentioned problem of severe depression is eliminated, but the tube However, there is a problem that, for example, when transmitting an optical fiber, the transmission distance becomes short, or the optical fiber is stopped halfway. That is, by collecting a plurality of tubes in advance to form a tube wire rod, although the problem of falling between the main wire rods that have been opened during the laying on the curved portion of the pipeline can be solved, the aggregate pitch of the tube wire rods and the main wire rods can be solved. Since it is different from the twisted pitch of the tube wire, the trajectory of the tube has a double spiral shape, and large and small complicated bends occur in the short pitch, which makes it difficult to transmit the optical fiber.

Further, in the tube wire rod, the tubes accommodated in the portion in contact with the main wire rod are changed one after another, and the lateral pressure applied from the main wire rod is also changed. This causes a phenomenon that the distortion of the inner diameter of the tube changes in the longitudinal direction, which increases the resistance at the time of passage, and it is thought that there was a problem that the passage of the optical fiber stopped especially at the bent portion of the pipe line. To be

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to easily insert a wire into a tube without dropping between the main wires of the tube. It is an object of the present invention to provide a tube composite cable having a possible shape and a manufacturing method thereof.

[0007]

According to a first aspect of the present invention, in the method for producing a tube composite cable in which a tube wire rod having a plurality of tubes and a main wire rod are twisted, the tube wire rod is It is characterized in that the plurality of tubes are twisted and formed in a direction opposite to the twisting direction of the main wire, and the main wire and the tube wire are twisted in the twisting direction of the main wire.

Further, in the invention described in claim 2,
In a method of manufacturing a tube composite cable in which a tube wire rod that aggregates a plurality of tubes and a main wire rod are twisted,
A tube wire formed by straightly collecting the plurality of tubes is unwound and unwound to be twisted with a main wire, so that the tube wire is assembled and integrated so that no twist enters.

In the invention according to claim 1 or 2,
In the invention according to claim 3, the main wire rod is a power cable larger than the tube wire rod, and the tube wire rod is arranged in one or a plurality of outward valleys formed by the main wire rod. There is.

In a fourth aspect of the invention, in a tube composite cable formed by twisting a tube wire and a main wire in which a plurality of tubes are assembled, the tube wire is formed by integrating the plurality of tubes. Each of the tubes maintains a relative position with respect to the center of the tube composite cable in any cross section, and each tube has the same pitch as the twisting pitch of the main wire and the tube wire. It is characterized in that the tube composite cable is arranged so that a point having a predetermined distance from each of the tubes from the center of the tube composite cable takes an orbit drawing a single spiral. A power cable larger than the tube wire can be used as the main wire. In addition, the tube wire rod configured by a structure in which the plurality of tubes are assembled and integrated has an outer shape having an angle matching a valley of the main wire rod in a part thereof, and a portion of the outer shape is a valley of the main wire rod. It can be configured to be arranged.

[0011]

According to the first aspect of the present invention, the plurality of tubes are first twisted at the same pitch as the twisting of the main wires and in the direction opposite to the twisting direction of the main wires. Thereby, when the tube wire is wound or stored during manufacturing, the length of each tube collected is constant, and a specific tube does not extend. next,
When this tube wire is twisted together with the main wire, the plurality of tubes gathered in the tube wire are untwisted, and each tube has a structure in which a single spiral track is drawn with the center of the tube composite cable as an axis.

According to the second aspect of the present invention, first, a plurality of tubes are straightly assembled to form a tube wire, which is twisted back and twisted with the main wire. As a result, each tube has a structure that draws a single spiral orbit around the center of the tube composite cable.

According to the invention of claim 3, claim 1
Alternatively, in the manufacturing method according to the invention described in 2, a power cable larger than a tube wire can be used as a main wire, and one or more tube wires formed in an outward valley formed by the power cable are arranged. This makes it possible to manufacture a tube composite cable that effectively utilizes the gap between the power cables.

According to the invention of claim 4, a plurality of tubes are integrated and integrated, and even when a large-sized main wire is used, it does not fall between the main wires. Also,
Each tube maintains a relative position with respect to the center of the tube composite cable in an arbitrary cross section, and the lateral pressure received by the tube from the main wire or the like is constant. Further, each tube is arranged at a pitch equal to the twisting pitch of the main wire material and the tube wire material so that a point having a fixed distance from the center of the tube composite cable for each tube draws a single spiral path. Therefore, each tube does not have a complicated bend at a short pitch. Therefore, for example, a wire rod such as an optical fiber can be easily sent into the tube. As the main wire, as in the invention described in claim 5, a power cable larger than the tube wire can be used.

Further, as in the invention described in claim 6, the tube wire having a structure in which a plurality of tubes are assembled and integrated has an outer shape having an angle matching a valley of the main wire with a part thereof. By configuring the portion of the outer shape to be arranged in the valley of the main wire rod, the contact surface between the main wire rod and the tube wire rod can be increased, and the movement in the front-back direction and the lateral direction can be suppressed, A tube composite cable having a stable structure can be obtained.

[0016]

1 is a sectional view showing an embodiment of the tube composite cable of the present invention. In the figure, 1 is a main wire, 2 is a tube, and 3 is a tube wire. In the tube composite cable having the cross-sectional structure shown in FIG. 1, the three main wires 1
And three tube wires 3 each having three tubes 2 are twisted together.

The three tubes 2 are arranged in an equilateral triangle, and in order to maintain this shape, a triangular sheath is applied to form the tube wire rod 3. Since the plurality of tubes 2 are integrated and twisted together with the main wire rod 1 in this manner, they do not fall between the main wire rods 1.

The tube wire 3 is rotated at the same pitch as the twisting pitch of the three main wires 1 while the main wire 1 is being rotated.
Are twisted together. At this time, since the tubes are arranged so that the relative positional relationship with respect to the center of the tube composite cable is maintained, the cross section of the tube composite cable always has a constant shape with respect to the center of the tube composite cable. Looking at each of the tubes 2, they are arranged so as to draw a single spiral orbit at an equal distance from the center of the tube composite cable. Therefore, an extremely small bend of the tube 2 does not occur, and the surface of the tube 2 that contacts the main wire 1 is fixed, so that the tube is not subjected to discontinuous lateral pressure deformation.

Further, the triangular shape of the tube wire 3 can be formed so as to match the shape of the valley of the main wire. With such a shape, the tube wire 3 can be tightly integrated with the main wire 1. At this time, since the contact surface between the tube wire 3 and the main wire 1 is large, not only the tube wire 3 is prevented from falling inward, but also the movement in the front-rear direction and the lateral direction is suppressed, which is stable. The structure is obtained.

Such a tube composite cable can be manufactured as follows. First, a plurality of tubes 2 are placed in a direction opposite to the twisting direction of the main wire 1.
Twist at the same pitch as the twist pitch of Main Battle Material 1,
The tube wire 3 is formed by covering and integrating. Since the tube wire 3 is twisted, the length of the tube 2 is constant even when wound, and the specific tube does not extend.

Next, the main wire 1 and the tube wire 3 are twisted together. At this time, the tube wire 3 is twisted so as to be arranged in the valley between the main wires 1. This twist is the main wire 1
The twisting of the tubes gathered in the tube wire rod 3 is unraveled. Therefore, the tube wire 3 itself is not twisted, and each tube has a main wire 1
Will be twisted in a single spiral around the circumference of. As a result, a tube composite cable whose cross section is as shown in FIG. 1 can be obtained.

Alternatively, by using a tube wire rod 3 in which a plurality of tubes 2 are gathered in a straight line without being twisted, and unwinding and unwinding, the main wire rod 1 is twisted.
It is possible to manufacture a tube composite cable as shown in FIG. 1, in which the tube wire 3 is not twisted and the tube wire 3 is arranged in a single spiral around the main wire 1.

Next, a specific example of the tube composite cable of the present invention will be described. 4.5m inner diameter as a tube
A polyethylene tube having a diameter of m and an outer diameter of 6 mm was used.
Using three of these tubes, a left twist was made at a pitch of 900 mm, and a sheath having a thickness of 15 mm was applied to form a triangular tube wire. A polyethylene-coated copper cable having an outer diameter of 110 mm was used as the main wire. Three main wires and three tube wires were twisted right with a pitch of 900 mm to form a tube composite cable. This sectional structure is shown in FIG.

Using such a tube composite cable, an experiment of transmitting an optical fiber to a tube was conducted. In the experiment, the outer diameter was 2 m, which was covered with foamed polyethylene.
A 7-fiber optical fiber unit having a length of m, a weight of 2 g / m, and a length of 300 m was fed by compressed air having a pressure of 7 kg / cm ² . As a result of this experiment, all the tubes in the tube composite cable were able to carry an optical fiber with a length of 300 m, and there was no problem in sending the optical fiber even after laying in the pipe line, which was good. there were.

Using a tube similar to the above-mentioned specific example, this time, three tubes were straightly assembled to form a tube wire. Three tube wires were used, and while twisted back, they were twisted together with the above-mentioned three main wires at a pitch of 900 mm to produce a tube composite cable. The cross-sectional structure of this tube composite cable is shown in FIG.
After the production, this tube composite cable was laid and an optical fiber transmission test was conducted. The laying performance of the optical fiber was good.

As a comparative example, three main wires are pitched 90 m.
When twisted right at m, three tubes were placed in each of the three gaps and a total of nine tubes were twisted at the same time, two tubes were sandwiched between the main wires during winding and were crushed. Also,
When a pipe having a diameter of 3 m and having four 30 ° bends was laid, three tubes in addition to the above-mentioned two tubes could not carry optical fibers. This is probably because the tube collapsed during the installation.

As another comparative example, a tube wire was manufactured by coating a tube with a pitch of 400 mm and twisting it to the right. This tube wire and the right-handed main wire 3
The tube and the cable were twisted right at a pitch of 900 mm to produce a tube composite cable. Although crushing of the tube did not occur at the time of production, as a result of evaluating the installation performance of the optical fiber,
As for the cable immediately after manufacturing, the communicatable distance of the optical fiber was about 60 m. This is much shorter than that of the tube composite cable using the present invention, and it was confirmed that the orbit at the time of twisting the tubes was a single spiral.

FIG. 2 is a sectional view showing a modified example of an embodiment of the tube composite cable of the present invention. In the figure, the same parts as those in FIG.
4 is a sheath. In the above-described example, the main wire and the tube wire are twisted together, and the main wire and the tube wire are laid in the pipeline. However, as shown in FIG. 2, after the main wire and the tube wire are twisted, the sheath 4 is further twisted. You may give and integrate. In the tube composite cable having such a structure, the same operation and effect can be obtained, and the sheath 4
Thus, the inner tube 2 and the main wire 1 are protected against the impact from the outside.

In the above-mentioned embodiments and specific examples, the case where the number of main wire rods is 3 is shown, but the present invention is not limited to this, and the case where there are two main wire rods,
Even in the case of four or more, the tube wire can be similarly arranged in the valley of the main wire to form the tube composite cable. Further, it is not necessary to arrange the tube wire rods in all the valleys of the main wire rod, and the number of tube wire rods can be changed according to the application. Further, the number of tubes constituting the tube wire rod can be changed, and it is sufficient that the thickness can be set so as not to fall between the main wire rods. The number of tubes included in each tube wire does not have to be the same, and can be changed appropriately.

[0030]

As is apparent from the above description, according to the present invention, the tube takes a single spiral trajectory with the center of the tube composite cable as an axis, so that the optical fiber or the like after the tube composite cable is laid Can be easily installed. In particular, even when used as a large capacity power cable where a large main wire is formed or a tube composite cable combined with an ultra-multicore copper communication cable, the tube does not collapse, and many tubes are used in one pipeline. There is an effect that the optical fiber can be stored.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a tube composite cable of the present invention.

FIG. 2 is a cross-sectional view showing a modified example of an embodiment of the tube composite cable of the present invention.

FIG. 3 is a cross-sectional view of a conventional tube composite power cable.

[Explanation of symbols]

 1 Main wire 2 Tube 3 Tube wire 4 Sheath.

Claims (6)

[Claims] 1. A method of manufacturing a tube composite cable in which a tube wire rod comprising a plurality of tubes and a main wire rod are twisted together, wherein the tube wire rod twists the plurality of tubes in a direction opposite to a twisting direction of the main wire rod. A method for producing a tube composite cable, which is formed in combination and twists the main wire and the tube wire in a twisting direction of the main wire. 2. A method of manufacturing a tube composite cable in which a tube wire rod made up of a plurality of tubes is twisted together with a main wire rod, wherein the tube wire rod made by straightly gathering the plurality of tubes is unwound and fed out. And a tube composite cable, wherein the tube wire is assembled and integrated so that no twist enters the tube wire. 3. The main wire rod is a power cable larger than the tube wire rod, and the tube wire rod is arranged in one or a plurality of outward valleys formed by the main wire rod. Or the manufacturing method of the tube composite cable according to 2. 4. A tube composite cable formed by twisting a tube wire rod and a main wire rod in which a plurality of tubes are assembled, wherein the tube wire rod is formed by integrating the plurality of tubes, and each of the tubes is optional. The cross-section of the tube composite cable maintains a relative position with respect to the center of the tube composite cable, and each tube has the same pitch as the main wire rod and the tube wire rod twisting pitch from the center of the tube composite cable. A tube composite cable, characterized in that it is arranged so that points with a fixed distance for each tube follow a trajectory that draws a single spiral. 5. A power cable larger than the tube wire is used as the main wire.
The tube composite cable described in. 6. The tube wire having a structure in which the plurality of tubes are integrated and integrated has an outer shape having an angle matching a valley of the main wire in a part thereof, and the outer wire portion is the main wire. The tube composite cable according to claim 4 or 5, wherein the tube composite cable is arranged in a valley.