JPS6031169B2 - Straightening method for loose core type ACSR - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the tensioning method of a loose core type ACSR.

Traditionally, ACS, which has a high tensile strength, is generally used for long stretches of overhead power lines.
R is used.

This ACSR, as is well known, has a steel wire with mechanical strength such as tensile strength arranged at the center, and an aluminum stranded wire layer on the outer periphery that regulates electrical performance such as power transmission capacity. It is built in between. To construct such an ACSR, the wires are stretched to the desired degree of slack and then attached to the tower. Then, a come-along is attached to the other end and pulled, and when the ACSR reaches the desired slackness, it is switched to a tension clamp and fixed, and the come-along is removed. Come-alongs used for this purpose are ACSR.
It has a structure in which a cylindrical clamp can be temporarily fixed from the outside through a sliding door, and both the steel core and the aluminum stranded wire layer are fixed together. On the other hand, so-called loose-core type ACSR, in which the outer diameter of the aluminum stranded wire layer provided on the outside of the steel core is increased to increase the current carrying capacity and reduce the generation of corona, is used as an ultra-high-voltage, large-capacity overhead electric wire. In other words, in loose-core ACSR, there is a gap between the steel core provided at the center and the aluminum stranded wire layer provided on the outside, or there are admixtures or other inclusions, and the steel core and aluminum stranded wire layer are in close contact with each other. The structure is such that they can slide against each other without touching each other. This is why loose core type ACS
Even if a come-along similar to a normal ACSR is attached to the outer circumference of the ACSR on R, the steel core will not be fixed, and even if the wire is tightened, the steel core will slip and the aluminum stranded wire layer will stretch, making it impossible to achieve the desired slack. . In view of this, the present invention provides a loose core type ACSR.
This system uses a general-purpose come-along, that is, a come-along with a cylindrical inner surface, to tighten the line in the same way as before. The steel core and the aluminum stranded wire layer are tightened by tightening the clamps from the outside, and then the wire is connected by a come-along.The steel core and the aluminum stranded wire layer are integrated without slipping. The desired looseness can be easily achieved by tightening the wire by come-along as in the conventional method.

Next, this will be explained in more detail based on the drawings.
Clamps 3 are attached vertically at distant locations to bring the steel core and aluminum stranded wire layer into close contact, and then the come-along 2 is pulled in the direction of the arrow in the figure to form a loose core type ACSRI.

The clamp 3 used in the present invention may be a known type that hinges the clamp body and the cap at one end and fastens bolts and nuts at the other end. It can be easily tightened using . In addition, in the figure, Krasop 3
Although two clamps 3 are placed side by side to ensure tight contact between the steel core and the aluminum stranded wire layer, it goes without saying that the present invention is not limited to this.Furthermore, after the wire tensioning work is completed, this clamp 3 is removed together with the come-along 2. As explained above, according to the present invention, when attaching a come-along to a loose-core type ACSR and making a long line, the ACSR is continued from the outside by approaching the installation position of the come-along, and the steel core and aluminum flammable wire layer are brought into close contact with each other. So-called loose core type A, in which there is a gap or an intervening layer between the steel wire layer and the aluminum stranded wire layer, making it loose.
Even in the case of CSR, there is an advantage that the wire can be easily tightened and the desired slackness can be achieved as in the case of normal ACSR.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing an example of implementing the method of the present invention. 1... Loose core type ACSR, 2...
Cam long, 3...clamp.

Claims (1)

[Claims] 1. When attaching a cylindrical inner come-along to the outer periphery of a loose-core type ACSR and tightening the wire, approach the attached come-along and tighten the ACSR from the outside to bring the steel core and aluminum stranded wire layer into close contact and tighten the wire. A loose-core type ACSR tensioning method characterized by the following.