JPS6031123Y2 - Compression type ACSR - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a compression type AC3R in which a compression-molded aluminum strand is provided around the outer periphery of a steel strand.

Conventionally, AC3R, which has a steel wire in the center of the aluminum stranded wire, has been used to increase the tensile strength of the aluminum stranded wire, but because of the steel wire in the center, the outer diameter of the aluminum stranded wire increases accordingly. .

As the outer diameter of the stranded wire increases, the wind pressure it receives when it is installed also increases, resulting in various drawbacks.

For this reason, the compression type AC3R was developed, in which aluminum strands twisted around the outer periphery of steel wires were compression molded to reduce the outer diameter without reducing the effective cross-sectional area of the wire.

As shown in Fig. 2, the compression type AC3R is made by twisting aluminum strands 2' around the outer periphery of steel strands 1', passing it through a chair and compression molding it to eliminate the twisting voids in the aluminum strands 2'. The effective cross-sectional area remains the same, but only the outer diameter has been reduced.

However, in such a compression type AC3R, as is clear from the figure, the aluminum strands 2' bite into the twist gaps of the steel strands 1', and the two are integrated.

When this compression type AC3R is installed and used, and the temperature of the wire increases, the linear expansion coefficients of the steel wire and aluminum stranded wire are different, but they cannot stretch separately, so the linear expansion of the entire wire occurs, and the linear expansion of the steel wire. The larger the AC3R, the greater the laxity of AC3R.

If the sag increases, the dimensions of the steel tower and other accessories will need to be increased, which will increase construction costs.

In view of this, the present invention forms a steel tape wrapping layer around the outer periphery of the steel stranded wire, compression molds the aluminum stranded wire on the outside of the steel tape wrapping layer, and thereby allows the aluminum stranded wire and the steel stranded wire to be combined in the compression type AC5R. The friction between them was reduced so that they could easily slip.

When such a compression type AC8R is installed and used and the temperature of the wire increases, the steel stranded wire and the aluminum stranded wire will expand separately, and the sag of the wire will be determined by the steel stranded wire, which has a smaller coefficient of linear expansion, and the sag will increase accordingly. This reduces the degree of stiffness and eliminates the drawbacks due to increased sag.

In particular, if a steel wire having an extremely small coefficient of linear expansion, such as amber or elinvar, is used as the stranded steel wire, the increase in sag will be further reduced.

Figure 1 shows an example of the compression type AC3R according to the present invention, in which a compression-molded aluminum strand 2 is provided around the outer periphery of a steel strand 1. A steel tape wrapping layer 3 is interposed between the two so that the two can slide against each other.

The steel tape winding layer 3 is horizontally wound, but is not limited thereto.

This steel tape wrapping layer 3 has higher hardness than the upper layer of aluminum stranded wire, so when the aluminum stranded wire 2 is compression molded, the aluminum stranded wire 2
Of course, the steel tape winding layer 3 also has very little chance of digging into the twisting gaps of the steel strands 1, so the steel strands 1 and the aluminum strands 2 are separated, there is no friction between them, and they can slide against each other. Therefore, when the temperature of the wire increases, the steel stranded wire and the aluminum stranded wire will stretch separately, and the aluminum stranded wire will share less of the stress.The steel stranded wire will stretch separately, and the increase in sag will be smaller, and the compression will increase. The outer diameter of the type AC3R is also smaller, and if the outer diameters are made the same, practical effects such as an increase in the effective cross-sectional area and a larger current carrying capacity can be obtained.

As described above, according to the present invention, a steel tape wrapping layer is interposed between the steel stranded wire 1 and the compression-molded aluminum stranded wire, so there is no friction between the two, and when the temperature rises, the steel tape will stretch from side to side. The sag of the wire is small and the outer diameter is also small due to the compressed acid of the aluminum stranded wire, which has many practical effects such as saving the installation cost of AC8R.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a compression type AC3R according to the present invention, and FIG. 2 is a cross-sectional view showing a conventional compression type AC3R. 1... Steel stranded wire, 2... Aluminum stranded wire, 3
・・・・・・Steel tape wrapping layer.

Claims (1)

[Claims for Utility Model Registration] 1. Compression-type AC3R0, which is characterized by compression-molding aluminum stranded wires twisted around the outer periphery of steel stranded wires via a steel tape wrapping layer. Compression type AC3R0 according to claim 1 of the utility model registration, characterized in that a steel wire with a small coefficient of linear expansion is used.