JPS6255364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable laying method for laying a cable wound in a cable storage tool in two directions from a winding end and a winding start end.

[Technical Background of the Invention] Conventionally, cable distribution and extension, in particular, methods such as laying a part of a large cable from a manhole into a tunnel or conduit, and then raising the remaining cable to a steel tower or leading it into a substation, have been practiced. In this case, the cable drum 1 is installed near the manhole 2 as shown in FIG. As shown in Figure 2, the remaining cable 3 is pulled out and deposited on the ground in a figure 8 shape, the winding start end of the cable 3 is exposed, and then the cable 3 is raised from this winding start end, for example, and pulled up to the steel tower 5, or It was being pulled into the substation.

[Problems with the Background Art] However, in such a conventional method of laying the cable 3, when the cable 3 is piled up in a figure 8 shape on the ground, the cable 3 is twisted.
The drawback was that the wire shield could buckle or loosen.

[Object of the Invention] The present invention has been made in order to eliminate such conventional drawbacks. The purpose of the present invention is to provide a method of laying a cable that can be extended without twisting the cable.

[Summary of the Invention] That is, the cable installation method of the present invention involves laying a cable wound in a cable storage tool from the end of the cable winding to a predetermined laying path, and then allowing the remaining cable to exit from the cable storage device. Place the remaining cable on a guide device equipped with a brake device, and while paying out the remaining cable from the cable storage device, lift it up until the start end can be removed from the cable storage device, then lower the cable guide device and unwind from the start end of the cable. By laying the cable on the designated route,
This prevents the cable from twisting during installation.

[Embodiments of the Invention] The details of the present invention will be explained below with reference to FIG. 3.

In FIG. 3, parts common to FIGS. 1 and 2 are designated by the same reference numerals.

FIG. 3 shows an embodiment in which the present invention is applied to the erection of a steel tower.

In the figure, a cable 3 to be laid is wound around a winding drum 1 installed near a rising steel tower 5. This cable 3 is similar to the conventional method in that it is drawn into the tunnel or pipe 4 for a predetermined length from the winding end through a cable guide 6 installed at the entrance of the tunnel or pipe 4 of the manhole 2. be.

A guide reel 7 is inserted below the cable 3 after it has been extended into the tunnel or conduit 4 for a predetermined length. The guide reel 7 is rotatably suspended from a wire 10 suspended from a crane 9 of a crane truck 8 via a shaft inserted through a center hole.
A brake device (not shown) is provided that can stop the rotation of the motor and adjust the rotational speed.

This braking device can be composed of, for example, a brake shoe provided near the center hole of the guide reel 7 that tightens the shaft by electromagnetic force, and a control device that remotely operates the brake shoe.

Note that the guide reel 7 may be replaced with another guide device having a function of guiding the cable 3.

The guide reel 7 is then gradually lifted up by the crane 9.

In this manner, when the amount of winding of the cable 3 on the winding drum 1 decreases, the brake device of the guide reel 7 is gradually activated to lift the guide reel 7 to a position where the winding start end of the cable 3 can be taken out. Next, the winding start end of the cable 3 is fixed to the tip of the wire 11 hooked on the pulley 10 installed above the cable starting position on the steel tower 5,
Wire 11 by winch 12 installed on the ground
At the same time as the guide reel 7 is hoisted up, the crane 9 of the crane truck 8 is operated to gradually lower the guide reel 7. At this time, adjust the brake device and
This prevents the winding from lowering due to its own weight toward the end of the winding, and adjusts the descending speed to prevent the U-shaped slack that occurs at the beginning of the winding from coming into contact with the ground. In this way, when the cable 3 is pulled up to a position where the cable does not touch the ground even if the guide reel 7 is removed, the guide reel 7 is removed from the cable 3, and thereafter the cable 3 is pulled up onto the steel tower 5 according to a predetermined procedure.

The above is an example in which the present invention is applied when pulling up the cable 3 to the upright part of the steel tower 5, but the present invention is not limited to such an example.

For example, when pulling cables into a substation from a manhole, the cables are first wound into a cable storage device and laid into a conduit or tunnel from the end of the cable winding, and then the remaining cables are pulled out from the cable storage device. Place the remaining cable on a guide device equipped with a brake device, and while paying out the remaining cable from the cable storage device, lift the winding start end to a position where it can be removed from the cable storage device. Then, while lowering the cable guide device, unwind from the winding start end. It can be laid towards power plants.

[Effects of the Invention] As described above, according to the present invention, there is no need to stack the cables in a figure-eight shape, and since the cables do not twist during installation, buckling or loosening of the wire shield of the cables, etc. This eliminates the possibility that the characteristics of the

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional cable laying method, FIG. 2 is an explanatory diagram showing the method shown in FIG. 1 from above, and FIG. 3 is an explanatory diagram showing an embodiment of the present invention. 1... Winding drum, 2... Manhole, 3...
... Cable, 5 ... Steel tower, 7 ... Guide reel, 9
...Crane, 10...pulley, 11...wire.

Claims (1)

[Claims] 1. After laying the cable wound in the cable storage tool from the end of the cable winding to the predetermined laying path,
Place the remaining cable protruding from the cable storage device on a guide device equipped with a brake device, unwind the remaining cable from the cable storage device one by one, and lift it up to the position where the winding start end can be removed from the cable storage device. A cable laying method characterized in that the cable is laid on a predetermined laying path from the winding start end while lowering the device.