JP2612631B2 - Simple installation tool and installation method for optical fiber cable - Google Patents

Description

The present invention relates to a laying tool and a laying method for laying an optical fiber cable in a long section.

[Conventional technology]

Conventionally, two methods are usually used to lay an optical fiber cable (hereinafter referred to as a cable) in a long section. That is, in the first method, as shown in an example in FIG. 3, the cable 4 wound around the drum 5 is moved from the point 12 substantially at the center (within the installation tension limit) of the cable installation section to the one point 11 first. Towing vehicle 15 using wire 14
The cable is towed and laid (FIG. (A)), and then workers 8, 9, and 10 use the vacant land near the point 12 to wind the cable 4 while writing the figure 8 (FIG. b)), take out the terminal end 7 of the cable 4 (FIG. 3 (c)), return the figure 8 and move the terminal end 7 toward the point 13 in the traveling direction by a towing vehicle with a wire 14.
At 15 the tow is pulled (figure (b)), and at the point 12, the ground cable is inserted into the manhole to complete the laying (figure (e)).

In the second method, as shown in FIG.
Is wound around the empty drum 16 at the central point 12 through the laying path while rotating the wound drum 5 (see FIG. 3A). Then, the cable 4 wound on the empty drum 16 is wound on a winding tank 17 driven by an electric motor (FIG. 2C), and the entire cable 4 is wound on the winding tank 17 (FIG. 2B). Then, the end 7 of the cable is taken out (FIG. 7 (d)), and the end 7 is pulled toward the point 13 in the opposite direction by the wire 14 with the towing vehicle 15 (FIG. 10 (e)). The ground cable is inserted into the manhole to complete the installation.

[Problems to be solved by the invention]

In the conventional method of laying an optical fiber cable described above, the first method, as shown in FIG. 4, is to write a figure 8 on the ground at the point 12, so that the work range is wide, and the work cannot be performed on the road. It is necessary that there is a vacant lot nearby and that it can be borrowed, and the number of workers is required because the worker 8 must write the figure 8 with the cable 4 and the workers 9, 10 must hold down and organize it. In the second method, as shown in FIG. 6, not only does the empty drum 16 require time for temporary winding, but also the winding of the winding tank 17 is performed by an electric motor, as shown in FIG.
Due to the rotation force of 18, a power source is required as a power source, and the winding tank itself is expensive, large and heavy, so it is inconvenient to transport and has poor workability.

The object of the present invention is that the working range is not wide, and does not require a large number of workers, and does not require much working time,
An object of the present invention is to provide a simple installation tool and an installation method of an optical fiber cable which does not require a power source for work, is lightweight, is convenient for transportation, and is inexpensive.

[Means for solving the problem]

A simple laying tool for an optical fiber cable according to the present invention comprises: a metal wheel supported in the cable end pulling direction of a drum around which the optical fiber cable is wound; and a wheel made of a lightweight material, and both ends are bent upward. A winding frame comprising a plurality of straight pipes connected to each other at the center, and a plurality of bent pipes connected vertically on a bell-shaped curved surface having a bottom surface having a diameter smaller than the length of the straight pipe at the bottom. And

Further, in the method for laying an optical fiber cable according to the present invention, the optical fiber cable wound on a drum placed at a substantially central point of the laying section of the optical fiber cable is pulled and laid in the direction of one end of the laying section. Thereafter, the remaining optical fiber cable wound around the drum is wound around the winding frame via the wheel, and the end of the cable is taken out. The end of the cable is laid again via the wheel. Towing is performed while being rewound from the winding frame toward the other end of the section.

[Action]

The optical fiber cable can be wound on a winding frame made of a lightweight material with a bent pipe connected to a bell-shaped surface at the bottom formed by a straight pipe with both ends bent. When laying in a long section, the work area for winding the cable at the central point is not widened, and only one worker is required. It does not require a power source as a power source, makes the equipment cheaper, and can be transported more easily.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of a simple laying tool for an optical fiber cable according to the present invention, FIG. 2 (a) is a plan view of a winding frame 1 of FIG. 1, and FIG. It is a front view of (a).

The simple laying tool for this optical fiber cable is a winding frame 1
And a gold wheel 2. As shown in FIG. 2, the winding frame 1 is made of a vinyl pipe, and two straight pipes having bent portions 22 facing upward at both ends are joined to each other at the center to form a bottom. On a bell-shaped surface having a circle 24 having a diameter shorter than the length of the straight pipe 21 as a base, four vertically bent pipes 23 are fixed at the lower end to the straight pipe 21 at the bottom, and the upper ends are mutually connected at the vertex 25 at the top. Connection is fixed. The wheel 2 is attached to the end of a rod 3 fixed in the cable pulling direction from the drum mount of the cable feeding vehicle on which the drum 5 around which the optical fiber cable is wound is mounted.

Since the winding frame 1 is made of a vinyl pipe, the simple laying tool of the optical fiber cable according to the present embodiment can be manufactured at a low cost and is lightweight, so that it is easy to carry and does not require a power source such as a power supply for winding the cable.

In order to lay an optical fiber cable in a pipe of a long section using the simple laying tool of the present embodiment, in the laying method shown in FIG. Instead of winding 4 while writing figure 8,
As shown in the figure, an operator 6 winds the cable 4 through the metal fitting 2 and inside of the bent portion 22 of the winding frame 1 so that the cable 4
The third end of the cable 4 is unwound from the winding frame 1 with the end 7 being again moved in the traveling direction through the wheel 2.
According to FIG. 3D, the cable is towed by a towing vehicle 15 by a wire 14 toward the point 13 and laid.

In the method of laying the optical fiber cable according to the present embodiment, winding and rewinding of the cable can be smoothly performed by one worker, the working space does not increase, and there is no need for a power source as a power source, and The laying tools are not only inexpensive but also lightweight and convenient for transportation, and work efficiency is improved.

When the cable is wound around the winding frame 1 of the present embodiment, the cable is twisted 360 ° for one round winding, but the cable is restored by unwinding. Length 1m, load 100Kg, 90
It has been confirmed that the twist of the cable is 0.1 dB or less and there is no crack in the outer aluminum tape. It can be seen that there is no problem if the winding of the cable is 4 m or more per round. The winding frame is manufactured with a diameter of about 2 m and a circumference of about 6.3 m from other conditions.

Further, although the laying method of the present embodiment is for use in laying optical fiber cable conduits (underground facilities), it can also be used for arranging optical fiber cables (overhead facilities).

〔The invention's effect〕

As described above, the present invention forms a winding frame with a lightweight material by connecting a curved pipe on a bell-shaped curved surface to a bottom portion where a plurality of straight pipes whose both ends are bent upward are joined at the center, By combining the winding frame and the wheel, when laying an optical fiber cable in a long section, a single worker can wind the cable at an intermediate point, so that the number of workers is not increased, Since the winding space is small, there is no need to borrow vacant land, etc.There is no need to temporarily wind the empty drum, so the work time does not increase, there is no need for a power supply for winding power, and tools Since it is light in weight, it can be easily transported, and the price is low, and there is no risk of failure, so that it can be used easily and the working efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a simple laying tool for an optical fiber cable according to the present invention, FIG. 2 (a) is a plan view of a winding frame 1 of FIG. 1, and FIG. (A) front view, third
3 (a), 3 (b), 3 (c), 3 (d), and 4 (e) are process diagrams showing a first conventional example of an optical fiber cable laying method, and FIG. 3 is a vicinity of a point 12 in FIG. 3 (b). Fig. 5 (a),
(B), (c), (d), (e), and (f) are process diagrams showing a second conventional example of a method for laying an optical fiber cable, and FIG. 6 is a diagram showing the vicinity of a point 12 in FIG. It is an enlarged view. 1 ... winding frame, 2 ... wheel, 3 ... rod, 4 ... cable, 5 ... drum, 6 ... worker, 11, 12, 13 ... point,
21 ... straight pipe, 22 ... bent part, 23 ... bent pipe, 24 ... circle,
25 ... top.

Claims (2)

(57) [Claims] 1. A tool for easily laying an optical fiber cable for laying an optical fiber cable in a long section, wherein the wheel is supported in the direction in which a cable end of a drum around which the optical fiber cable is wound is pulled out. A plurality of straight pipes formed of a lightweight material, both ends of which are bent upward and connected to each other at the center, on a bell-shaped curved surface having a bottom with a diameter smaller than the length of the straight pipe at the bottom. A simple laying tool for an optical fiber cable, comprising: a winding frame formed by connecting a plurality of curved pipes in a vertical direction. 2. A laying method for laying an optical fiber cable in a long section using the simple laying tool of the optical fiber cable according to claim 1, wherein the laying method is substantially at the center of the laying section of the optical fiber cable. After pulling and laying the optical fiber cable wound around the drum placed at the point in the direction of one end of the laying section, the remaining optical fiber cable wound around the drum is wound through the wheel. An optical fiber, which is wound on a take-up frame to take out the end of the cable, and the end of the cable is towed out while being rewound from the take-up frame again toward the other end of the laying section via the wheel, and laid. How to lay cables.