JPS60165604A - Stringing method of optical fiber composite overhead earth wire - Google Patents

Abstract

PURPOSE:To apply a prefabrication method to an optical fiber overhead earth wire and to enable improvement in workability by stringing the overhead earth wire fixed with drop-wire clamps at intervals allowing for sag between steel towers by means of a traction wire and anchoring the drop-wire clamps to the steel towers. CONSTITUTION:The span length between steel towers are precisely measured and drop-wire clamps 14 are fixed to an optical fiber composite overhead earth wire 10 inserted internally with an optical fiber cable 9 at the intervals corresponding to the measured span length added with a sag amount and interposed with surplus amounts B1, B2 in the stage of stringing the wire 10 between the steel towers. The front end of the wire 10 is pulled by a messenger wire and is strung between the steel towers and thereafter the wire 10 is anchored to the steel towers except the lengths B1, B2.... The application of a prefabricated stringing method to the wire 10 is thus made possible and the workability is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for extending an optical fiber composite overhead ground wire.

[Technical implications of the invention and its problems] In recent years, as a method of extending overhead power transmission lines, in order to cope with the increase in the size of power transmission lines and the lack of tracing power, and to streamline the wiring work, the method of extending overhead power transmission lines has been changed from the conventional method carried out on towers. The Prefabricated Frame II method is used, in which the sag adjustment is performed on the ground.

In this prefabricated overhead line construction method, the span length between the towers is precisely measured in advance from the ground, and based on this measurement, the necessary wire length is calculated taking into account the slack between the towers, and the required wire length is determined to place the overhead power line at the specified location. will be marked.

Next, at the construction site, each overhead power transmission line is cut according to the markings, and retaining metal fittings are attached to both ends of the cut overhead power transmission line, and Metsenger wires longer than the tower width are connected in order from the overhead power transmission line that extends farthest away. The cables are connected in series through the pylons, and the wires are sequentially extended between the pylons.

Thereafter, the metsenger wire is removed from each tower, and each retaining fitting is fixed to the tower via a vernier and an insulator to complete the wire extension.

In this construction method, as a method of fixing an overhead power transmission line to a steel tower, for example, a retaining fitting 1 having a cylindrical steel core aluminum stranded wire compression retaining part 1a and a jumper wire compression retaining part 11) as shown in FIG. A method has been adopted in which the steel-core aluminum stranded wire 2 is secured to the steel tower using a steel-core aluminum strand.

That is, as shown in FIG. 1, the steel core aluminum stranded wire 2 is
After inserting and compressing connection into the steel-core aluminum stranded wire compression retaining portion 1a of the retaining fitting 1, and securing the retaining fitting 1 to the steel tower 5 via the bar steel A74, the jumper wire 3 is inserted into the jumper wire compression retaining portion 1b. Insert and connect with compression.

By the way, such a prefabricated overhead wire construction method is shown in Figure 2, in which a steel wire 7 and an aluminum wire 8 are placed on top of a metal vibro.
If it can be applied to the overhead wire of the optical fiber composite overhead ground wire 10, which is constructed by sequentially twisting the wires and inserting the optical fiber cable 9 into the inside of the metal vibro, the work will be similar to that of the overhead power transmission line. It is thought that advantages can be obtained.

However, in the extension of the optical fiber composite overhead ground wire 10,
Since there is an optical fiber cable 9 inside, if the optical fiber composite overhead ground wire 10 is cut to the necessary wire length to connect between the towers before the cable is extended, there will be no extra length for connecting the optical fiber cable 9. However, it has been impossible to apply the conventional prefabricated overhead wire construction method to the extension of the optical fiber composite overhead ground wire 10 for this purpose.

[Object of the invention] The present invention has been made to solve these difficulties.
The object of the present invention is to provide a method for extending an optical fiber composite overhead ground wire in which a prefabricated three-way overhead wire construction method can be applied to the extension of the optical fiber composite overhead ground wire.

[Hair 1 of the Invention] That is, the method for extending an optical fiber composite overhead ground wire of the present invention is to provide an optical fiber composite overhead ground wire between steel towers by providing a hollow part in the center and inserting an optical fiber cable into the hollow part. When extending the line, the span length between each tower is precisely measured, and the distance corresponding to the required wire length, which is the above-mentioned can diameter and span length plus slack, is determined for each optical fiber composite overhead ground wire to be extended. At each of the above-mentioned intervals, a retaining fitting is fixed with an extra length for connecting the optical fiber cable interposed between the steel towers and the above-mentioned intervals, and the optical fiber composite overhead ground wire to which this retaining fitting is fixed is fixed. The wire is characterized in that after connecting the tip to a traction metsenger wire and extending the wire continuously between each steel tower, the wire is tied to the respective steel towers by the retaining metal fittings, leaving the above-mentioned extra length on the tower.

(Embodiments of the invention) The details of the present invention will be explained below with reference to the drawings.4- Ru.

In the optical fiber composite overhead ground wire extension method of the present invention, since the prefabricated overhead wire construction method is applied to the extension of the optical fiber composite overhead ground wire 10, the span length of the tower to be extended is first determined. As shown in Figures 3 and 4, each span length was determined by calculation in order from the tower side at the starting point of the extension wA at the factory when manufacturing the optical fiber composite overhead ground wire 10. Required wire length including slackness A+, A2,
. . . and the extra length B+182 provided for connecting the optical fiber cable on the tower, . . . are sequentially A I ,
Markings are made, for example, with ink, at the positions where the retaining metal fittings 14 are to be attached so as to be arranged alternately as B I NA 2 , B 2 , . . . .

Thereafter, the optical fiber composite overhead ground wire 10 marked as described above is sequentially wound around a drum 11 and transported to the construction site, where it is passed through a wire-stretching car 12 and transported to a compression work site on the ground while being stretched. 13, sequentially optical fiber composite overhead ground wire 1
The retainer fitting 14 is attached to the above indicated position of 0.

As shown in FIG. 5, for example, this retaining fitting 14 has a locking part 16 having bolt holes 15 on both sides of the end, a concave groove 17 along one dividing surface and a locking part 16 on the other side. A pair of metal semi-cylindrical bodies 19 having a protrusion 18 that engages with the groove 17 is used.

This retaining fitting 14 is fitted into a predetermined position of the optical fiber composite overhead ground wire 10 to be extended.
The fiber optic composite overhead ground wire 10 is fixed by compressing the body of the fiber optic.

Next, as shown in FIG.
After suspending it on the metal wheel 21 on the top of the optical fiber composite overhead ground wire 10, a mainsenger wire 22 for traction is attached to the tip of the optical fiber composite overhead ground wire 10.
The wire is connected to the wire, and is pulled by a pulling device 23 such as a winch to continuously extend the wire to the steel tower 20.

After that, each steel tower 20. At this point, the retaining fitting 14 is secured to the steel tower 20 via the vernier 24 as shown in FIG.

In addition, by providing a protector on the hold-down fitting 14 attached to the optical fiber composite overhead ground wire 10 as described above, the hold-down fitting 14 will not interfere with the wire-stretching work during wire extension, and the wire can be continuously extended. You can avoid passing the gold wheel 21.

Next, extra lengths 81, 82 for optical fiber cable connection of the lζ optical fiber composite overhead ground wire 10 which is extended between each steel tower.
, ... are wound several times each to form a loop, and then the outside of the stranded conductor, etc. of the optical fiber composite overhead ground wire 10 is wound at the intermediate position of the loop with the extra lengths B + , B 2 , ... The covered portion is cut and removed to a required length to expose the optical fiber cable 9, and connected to a connector 25 for amplifying or branching the transmission signal of the optical fiber coupler 9 and extracting the signal. Note that it is not necessary to connect the optical fiber cables to each tower, and it is sufficient to connect the optical fiber cables only at locations where signal amplification, branching, etc. are necessary.

[Effects of the Invention] 7- As explained above, according to the method for extending an optical fiber composite overhead ground wire of the present invention, it becomes possible to apply the prefabricated overhead wire construction method to the optical fiber composite overhead ground wire to extend the wire. , workability is significantly improved.

In addition, since the overhead ground wire can be extended without cutting, there is no risk of water seeping into the optical fiber cable during construction, and there is also less work to be done at heights, resulting in greater safety.

In particular, as shown in the embodiments, when a compression type retaining fitting is used, there is an advantage that the reliability is higher than that of a bolt tightening type retaining fitting, and the workability of ground work is also better.

[Brief explanation of drawings]

Figure 1 is a diagram to explain the conventional prefabricated overhead wire construction method.
Figure 2 is a cross-sectional view of the optical fiber composite overhead ground wire; Figure 3;
4 and 6 are diagrams for explaining one embodiment of the present invention, and FIG. 5 is a perspective view of tightening an example of the retaining fitting used in the method of extending the optical fiber composite overhead ground wire of the present invention. It is a diagram. 9...... Optical fiber cable 8- 10...... Optical fiber composite overhead ground wire 14... Retainer fitting 16...
......Locking part 20... Steel tower 21... Gold tl]22...
・・・・・・・・・Towing Metsu Senji 17-Y A7-2
4・・・・・・・・・Vernier 25・・・・・・
・・・・・・Connector representative Patent attorney Suyama Sa - (1 idiot) Figure 5 M^ 14 1 (J

Claims (3)

[Claims] (1) When extending an optical fiber composite overhead ground wire, which has a hollow part in the center and inserts an optical fiber cable into this hollow part, between towers, the span length between each tower is precisely measured, and the length of the span between each tower is precisely measured. At intervals corresponding to the required wire length, which is the sum of the above-mentioned span lengths and slack valves, the optical fiber composite overhead ground wire to be wired is
and fixing a hold-down fitting while interposing an extra length for connecting the optical fiber cable on the steel tower between each interval, and using the tip of the optical fiber composite overhead ground wire to which the hold-down fitting is fixed for traction. Continuously connect each a #! to the Metsenger wire! 1. A method for extending an optical fiber composite overhead ground wire, characterized in that after the wire is extended for one length of time, the extra length is left on the tower and the wire is tied to the steel tower using the retaining metal fittings. (2) The method for extending an optical fiber composite aerial ground ring according to claim 111, wherein the retainer is a compression retainer having a longitudinally divided sleeve having an engaging portion on the dividing surface. . (3) A patent claim characterized in that a plurality of loops are formed in the extra length for connecting optical fibers on a steel tower, and the optical fiber cable is exposed at a part of the loops and connected to a connector. A method for extending an optical fiber composite overhead ground wire according to item 1.