JPS6057809A - Tensionless wire drawing method of optical fiber cable - Google Patents

Abstract

PURPOSE:To draw an optical fiber cable nearly without applying any tensile force by mounting the optical fiber cable on cable carriers suspended from a wire drawing rope, and taking up the wire drawing rope. CONSTITUTION:Rope supporters 14 are fitted to supporting columns 1 respectively and the wire drawing rope 3 is unwound and drawn up to a winch 7 while extended on rollers 15 of the rope supporters 14. Then, the wire drawing rope 3 is clamped by the rope clamping part 17 of a tip cable carrier 16 and the optical fiber cable 5 is also clamped by the cable clamping part 18 at a drum place D. The drawing rope 3 is taken up by the winch 7 and a cable drum 4 is rotated by a power drum rack 13 at the same time; and cable carriers 19 are fitted to the wire drawing rope 3 by being clamped by rope clamping parts 17 without tensing the optical fiber cable 5, and the optical fiber cable 5 is mounted on a V-shaped metallic fixture 20 provided to the lower end of the cable carrier 19 at every time to draw the optical fiber cable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead cable extension method for optical fiber cables.

Unlike conventional communication cables, optical fiber cables have core wires made of quartz, etc., and while they have various excellent characteristics, their mechanical properties are fundamentally different from those of metals. It must be handled carefully to avoid shock, excessive tension, and excessive bending. In other words, when stretching an optical fiber cable, the allowable tension is less than or equal to Kp, the stretching speed is less than /min/θm, and the bending radius is 4.
00 or more, and the construction method is regulated.

To explain the conventional optical fiber cable extension method using Figure 1, the end of the cable extension rope (3) attached to the cable extension wheel (2) attached to the support column (1) and the cable drum (4
) K-wound optical fiber cable (5) is connected via the reburner (6), and the wire rope (3) is wound into a lobe while monitoring the wire tension with a tension meter (8). Winch (7)
) For lightweight wires that have obstacles (9) (public roads, houses, etc.) A hanging wire method is also used.

With the conventional Kouki traction method °, the allowable tension during wire extension is O
Since it is regulated to be below K9, the length of the line is approximately /,
It remains at around 0.009 m. Therefore, in long-distance construction, there are drawbacks such as temporarily constructing an engine field (E) and a drum field (D) every t and ooo-m, and making connections there.

In order to eliminate the above-mentioned drawbacks, the present invention is based on the following: - Only a slight tension is applied to the tip of the Optical 7 Eyepa cable, and after that,
Since only the tension is due to its own weight and one extension can be made without applying any tension, it is possible to extend a long line by connecting long-length ooom optical fiber cables at one location in the drum yard and sending them out one after another. This is a wire extension method.

Of course, it goes without saying that ti, ooo'*, yoooona's long optical fiber cable is extended &I#i.

An example of the construction method will be described below with reference to FIG. 2. A lobe winding winch +7) is installed in the engine field (llf). In the drum field), there is a reel mount OeK rope reel 0 set, a power drum mount +3NC whose speed can be adjusted by power, and a cable drum (4) set. −
Attach rope supporter 04 and f! Pull out the Fs rope (3) and attach it to the rope supporter 04.
P-pu winding winch (7)
The line will be extended to After the rope has been stretched, the rope (3) is held in the drum field (D) by the lobe gripping fin of the tip cable carrier 00 and suspended, and the optical fiber cable (6) is It is held by the cable gripping part Oe of the tip cable carrier Oe.

Next, while applying a brake to the rope reel (6), tension is applied to the drawn rope (3) and the drawn rope (3) is wound up by the lobe winding winch (7). At the same time, the cable drum (4) is rotated by the power drum mount a3, and it is fed out so that no tension is applied to the optical cable (5).While the cable (6) is being fed out, the cable carrier a9 Attach the rope grip part Q to the extended rope (3)
Attach the optical fiber (cable (5
) and repeat this operation to extend the wire.

As explained above, according to the wire stretching method of the present invention, the optical fiber cable placed on the figure 7 bracket of the cable carrier suspended from the wire extension rope can be attached to the cable carrier by winding the wire extension rope. The line will be moved and extended. Therefore, tension management during wire stretching is also unnecessary.

The main line extension method that made long line extension possible, engine station,
The number of drum stations can be reduced, and the fiber optic cables can be connected at one drum station and sent out sequentially, and the optical fiber cables do not sag even when there are obstacles (public roads, houses, etc.). This has the advantage of saving labor and increasing efficiency of erection work, such as not requiring any special measures to prevent drooping.

0, which is a tensionless wire stretching method for Hikari 7ryo Ipa cable that has the above features as an effect.

[Brief explanation of the drawing]

Figure 1X1 shows an example of the conventional construction method. FIG. 2 shows an O t support column 13. which is an embodiment of the present invention. Power drum mount 22'' Wire rolling wheel 14A Rope supporter 3 Wire stretching rope tS Roller ≠ Cable drum /6. Tip cable carrier! Optical fiber cable /'7 Rope gripping part t Reburning device ll Cable gripping part 7 Rope winding winch 19
．． Cable carrier H1, tension meter, 20. V-shaped bracket Obstacle 2 tons Metal wheel 10, tension wire 2 units Connection point P Drum field, 23 Connection platform E Engine field ll Reel mount 12 Rope reel Continued from page 1 0 Inventor Masaaki Kanazawa Sendai Nuno Ichiban Inside the Machi 2-chome Development Department 0 Inventor Masami Katsutaka Sendai Mae Ichibancho 2-chome Telecommunications Department

Claims (1)

[Claims] The present invention provides an aerial optical fiber cable! This is related to the wire-stretching method used when installing on railroad tracks.The optical fiber cable is placed on a cable carrier suspended from a cable-stretching lobe, and the cable carrier moves by winding up the cable-stretching rope. The tension-free extension of Hikari 7 eyep cable is characterized by the ability to extend the optical fiber cable in a state where almost no tension is applied to the fiber optic cable mounted on the Nurple gIl machine. Construction method.