JP2000207957A - Manufacture of gap-type power transmission wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stretch and retain a power transmission wire by holding it from the outer periphery of an aluminum conductor. SOLUTION: This method performs the manufacturing of a gap-type power transmission wire, comprising a process 11 for applying a filler to the periphery of a steel core 1, and processes 13, 14 for intertwining aluminum conductors with one another on the periphery of the steel core having the applied filler. In this case, in a spacer mounting process 11 in front of the aluminum conductor intertwining processes 13, 14, the steel wire 1 is brought into a stretched form as is the case of its installation, and a spacer for partially embedding the gap between the steel core 1, and the aluminum conductors is mounted to the periphery of the steel core 1 in that form. By partially embedding the gap between the steel core 1 and the aluminum conductors with the spacer, when the wire is held from the periphery of the aluminum conductors, its tightening force can be allowed to act up to the steel core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for manufacturing a gap type transmission line.

[0002]

2. Description of the Related Art Conventionally, a gap type ACSR shown in FIG. 3 has been known. This has an aluminum conductor 51 on the outer periphery of the steel core 50,
If a filler 52 is interposed between the two and only the steel core 50 is gripped during tensioning, the aluminum conductor 51 has a structure in which no tension is applied. For this reason, even if more current flows than normal ACSR with no gap, the sag is determined only by the linear expansion coefficient of the steel core, and the ground clearance of the transmission line can be maintained at the same level as normal ACSR . Here, an example in which the steel core 50 is configured by twisting a plurality of steel wires, and the aluminum conductor 51 is configured by two types of a sector-shaped aluminum alloy wire 53 on the inner peripheral side and a circular aluminum alloy wire 54 on the outer peripheral side. Is shown.

[0003] Such a gap type transmission line is manufactured by the following steps. First, a steel core is formed by twisting a plurality of steel wires. Next, a filler is applied to the outer periphery of the steel core. Then, a fan-shaped aluminum alloy wire and a circular aluminum alloy wire are sequentially twisted around the outer periphery of the steel core coated with the filler.

[0004]

However, the conventional gap type
In ACSR, the aluminum conductor slides against the steel core,
Even when trying to pull out the aluminum conductor from the outer periphery during wire drawing, tension cannot be applied to the steel core.
For this reason, a predetermined length of aluminum conductor is loosened at the end of the gap type ACSR to expose the steel core, a steel core clamp is compressed and mounted on this steel core, and a cam-along is mounted on the outer periphery of the aluminum conductor. After performing such a complicated operation, the wire was connected.

[0005] In general, there are compression type anchoring clamps and bolting clamps for retaining transmission lines. In the compression type clamp, complicated operations such as loosening the aluminum conductor and compressing the steel core are required. On the other hand, as shown in FIG. 4, the bolt clamp has a structure in which the transmission line is clamped from the outer periphery between the press fitting 41 and the receiving fitting 42 by the tightening force of the bolt 40. For this reason, the fastening force cannot be applied to the steel core, and the steel core cannot be used.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of manufacturing a gap type power transmission line which can be extended and drawn by gripping from the outer periphery of an aluminum conductor.

[0007]

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, partially filled the gap between the steel core and the aluminum conductor in the gap type transmission line with a spacer. With this idea in mind, it has been found that, when the spacer is mounted, the steel core is brought into a stretched state when erected.

That is, the method of manufacturing a gap type transmission line according to the present invention comprises a step of applying a filler to the outer periphery of a steel core and a step of twisting an aluminum conductor around the outer periphery of the steel core coated with the filler. In the method for manufacturing a type power transmission line, before the step of twisting the aluminum conductor, the steel core is brought into an expanded state at the time of erection, and the gap between the steel core and the aluminum conductor is partially formed on the outer periphery of the steel core in that state. It is to provide a process of attaching a filling spacer.

As described above, since the gap between the steel core and the aluminum conductor is partially filled by attaching the spacer to a part of the transmission line in the longitudinal direction, if this portion is gripped from the outer periphery, the tightening force is obtained. Can be applied to the steel core. And by installing the spacer after the steel core is in the stretched state at the time of erection,
In the transmission line at the time of erection, the place where the spacer is provided can be used as a retaining portion for the steel tower, and the transmission line can be fixed using a bolt clamp. Therefore, it is preferable that the intervals at which the spacers are provided correspond to the span length.

[0010] In the manufacturing method of the present invention, the means for bringing the steel core into the stretched state at the time of erection includes tensioning the steel core and heating the steel core. If you are nervous,
What is necessary is just to tension with the tension equivalent to the tension at the time of installation. Also,
When heating the steel core, the steel core may be heated to a temperature corresponding to the temperature at the time of charging.

Further, either of the step of applying the filler and the step of attaching the spacer to the steel core may be performed first.
If the spacer is attached after applying the filler, the filler also exists at the place where the spacer is attached.
On the other hand, if you apply the filler after installing the spacer,
By stopping the application operation of the filler only at the location where the spacer is provided, it is possible to adopt a configuration in which the filler is removed only at the location where the spacer is provided. Thereby, the intervals and slippage between the steel core, the spacer and the aluminum conductor can be reduced, and the tightening force when the power transmission line is gripped from the outer periphery can be more reliably applied to the steel core.

The aluminum conductor includes both conductors made of aluminum or an aluminum alloy. The shape of the aluminum conductor is desirably composed of two types, for example, a fan-shaped aluminum alloy wire on the inner peripheral side and a circular aluminum alloy wire on the outer peripheral side. The use of fan-shaped aluminum alloy wire prevents the collapse of the shape due to the pressure of the drawing wheel and the clamp, etc., and maintains the gap with the steel core. On the other hand, the steel core is desirably formed by twisting a plurality of steel wires.

[0013] The spacer may be a cylindrical one fitted into the outer periphery of the steel core, but is preferably a spiral body fitted into each groove of the steel core. That is, it is desirable that the cross section formed between each twisted groove of the steel core and the fan-shaped aluminum alloy wire has a shape corresponding to a substantially triangular space. In particular, if the spacer is formed in a spiral shape in advance,
It can be easily fitted into the groove of the steel core, and the manufacturability can be easily performed.

The material of the spacer may be a material which is deformed by a compressive force when gripped by a clamp. Due to this deformation, the cross-sectional shape of the spacer approaches the shape of the space formed between each twisted groove of the steel core and the fan-shaped aluminum alloy wire, so that this space can be filled without gaps and the transmission line is gripped from the outer periphery. Then, it becomes easy to apply the tightening force to the steel core. Specific examples include steel, copper, aluminum, and plastic.

The length of the spacer is suitably about 3 m to 7 m. In general, the length of about 3 m is necessary to extend or hold the transmission line, so if a longer length is provided, the space where the spacer is provided will be Can be gripped. Conversely, if the spacer length is too long, the material is just wasted,
It is preferably up to about 7 m. Of course, if the spacers become extremely long and are applied to most of the transmission lines,
Since the merit cannot be obtained as a gap type transmission line, a spacer is provided only in the vicinity of the place where gripping is required.

Since the portion where the spacer is provided has a slightly larger diameter than the other portions, the portion where the spacer is provided can be determined by using this thick portion as a mark.
Also, where the spacer is provided, the twist of the aluminum conductor is slightly widened and a slight gap is formed in the twisted groove, so if the spacer is colored conspicuously red or yellow, the gap of the groove can be further increased It can also be determined by finding a colored part from. In addition, at the time of manufacturing, if appropriate marking is applied to the outer periphery of the place where the spacer was applied on the transmission line,
This marking functions as a mark for the place where the spacer is provided.

[0017]

Embodiments of the present invention will be described below. Before describing the manufacturing method of the present invention, the structure of the gap type ACSR obtained by the method of the present invention will be described first. FIG. 1 is a sectional view of the gap type ACSR.

The ACSR has an aluminum conductor 2 on the outer periphery of a steel core 1, a gap is formed between the steel core 1 and the aluminum conductor 2, and a filler 3 is interposed in the gap.

The steel core 1 was constructed by twisting seven steel wires. The aluminum conductor 2 was constituted by arranging eight fan-shaped aluminum alloy wires 4 on the inner peripheral side and 18 circular aluminum alloy wires 5 on the outer peripheral side. As the aluminum alloy wires 4 and 5, 60% conductivity heat-resistant aluminum alloy wires were used. Further, a heat-resistant compound was filled as the filler 3 interposed in the gap between the steel core 1 and the aluminum conductor 2.

Here, a spacer 6 is interposed between the steel core 1 and the aluminum alloy wire 2. The spacer 6 has a substantially triangular cross section,
A total of six spiral aluminum wires corresponding to the grooves of the steel core 1 were used. The length of each spacer 6 is 5 m.

The procedure for manufacturing such a transmission line will be described with reference to FIG. First, a steel core 1 is formed by twisting steel wires. When the steel core 1 is unwound from the supply roller 10, it is pulled to apply a tension corresponding to the tension at the time of erection.

Next, the steel core in a tensioned state is introduced into the spacer mounting step 11, and the spacer 6 is inserted into the groove from one of the steel cores.
Attach. Since the spacer 6 is formed in a spiral shape in advance, it can be easily fitted into the twisted groove of the steel core 1.
At this time, the spacers 6 are mounted at intervals corresponding to the span length. Thus, when the power transmission line is actually installed, the location where the spacer 6 is provided corresponds to the location where the tower is to be fixed to the tower, so the location where the spacer 6 is provided is used as a fastening section for the tower and a fastening clamp. The transmission line can be fixed using a bolted clamp.

Subsequently, the steel core 1 is coated with a filler 3 in a coating step 12.
To be introduced. At this time, it is desirable that the filler is not applied only at the location where the spacer 6 is provided. After that, fan-shaped aluminum alloy wire 4 is placed on the steel core coated with filler.
, And a round aluminum alloy wire 5 is further twisted thereon through a winding step 13. If necessary, the outer periphery of the place where the spacer 6 is provided is marked to form the power transmission line of the present invention.

In this case, the steel core is tensioned as a means for bringing the steel core into the stretched state at the time of erection, but the steel core may be heated to the temperature at the time of charging instead.

[0025]

As described above, according to the manufacturing method of the present invention, the gap between the steel core and the aluminum conductor is partially filled with the spacer, so that the clamping force can be applied to the steel core even if it is gripped from the outer periphery. Can be obtained.
Thus, the portion where the spacer is provided can be extended by gripping it from the outer periphery with a cam along or the like. Moreover, it can be fixed to a steel tower using a bolt clamp. In particular, if a bolted clamp can be used, there is no need to cut the power transmission line, which can greatly contribute to improving the workability of the wire drawing operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gap type transmission line obtained by the method of the present invention.

FIG. 2 is a schematic process drawing of the method of the present invention.

FIG. 3 is a cross-sectional view of a conventional gap type transmission line.

FIG. 4A is a schematic view of a bolted clamp, and FIG. 4B is a sectional view of a tightened portion thereof.

[Explanation of symbols]

1,50 Steel core 2,51 Aluminum conductor 3,52 Filler 4,53 Sector aluminum alloy wire 5,54 Circular aluminum alloy wire 6 Spacer 10 Supply roller 11 Spacer installation process 12 Filler application process 13 Sector type aluminum alloy wire twist Process 14 Twisting process of circular aluminum alloy wire 15 Winding roller 40 Bolt 41 Pressing bracket 42 Receiving bracket

Claims (5)

[Claims] 1. A step of applying a filler to an outer periphery of a steel core,
A step of twisting an aluminum conductor around the outer periphery of a steel core coated with a filler, and a method of manufacturing a gap type power transmission line, wherein before the step of twisting the aluminum conductor, the steel core is in an expanded state at the time of erection, A method for manufacturing a gap type transmission line, comprising a step of attaching a spacer for partially filling a gap between the steel core and the aluminum conductor on an outer periphery of the steel core in that state. 2. The method for manufacturing a gap type transmission line according to claim 1, wherein the interval at which the spacers are provided corresponds to the span length. 3. The method for manufacturing a gap type transmission line according to claim 1, wherein the steel core is tensioned as a means for bringing the steel core into an elongated state when the steel core is erected. 4. The method for manufacturing a gap type transmission line according to claim 1, wherein the steel core is heated as a means for bringing the steel core into an elongated state at the time of erection. 5. The method according to claim 1, wherein the steel core is formed by a step of twisting steel wires, and the spacer is a spiral body fitted into a groove of the steel core.