JPS61244209A - Scaffold-free extension method and protection frame body used therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to extending a linear body across so-called obstacles such as high-voltage lines, communication lines, railways, expressways, or human houses. The present invention relates to an improved wire extending method and a protective frame used therefor.

[Background and purpose of the invention] Electric cables, cableway wires, etc. are not necessarily installed only in areas without obstacles, but are also installed across obstacles such as high-voltage lines as described above. There are many examples.

- Taking an overhead power transmission line as an example, as shown in FIG. 5, an ultra-high voltage line 30.
30 is often used as an overhead wire.

Generally, when extending a linear body such as a power transmission line,
Although the wire is stretched with care to avoid excessive sagging while applying braking with the wire rolling car, it is difficult to avoid irregularities in the stretching tension due to slipping of the rolling car during the unwinding and winding of the wire. The occurrence of abnormal drooping of the striatum is unavoidable.

If the line crosses a live special high-voltage line, the occurrence of such sagging will result in an extremely dangerous situation. Therefore, when extending the ultra-high voltage line 30 across the extra high voltage line 20, a steel tower 40 as a protective scaffolding is constructed near the extra high voltage line 20 as shown in FIG. Top protection net 4
Cover it with 1 and extend the wire.

However, when constructing the above-mentioned protective scaffolding 40, it is necessary to cut off the power to the special high voltage line 20, and if the voltage is high, the steel tower that serves as the scaffold needs to be tall and sturdy, and the existing line If the angle of intersection with the tower is small, the width and length of the tower will be large, making it extremely expensive to acquire land and compensate for it. There are even difficulties in transporting the materials. On the other hand, such scaffolding needs to be removed after the line extension work is completed, but the cost is not too high, and since it is constructed according to individual circumstances, it is not versatile, and it is difficult to produce products. There are also other problems, such as depreciation costs must be accounted for, and waste materials such as concrete pieces are generated during the rough removal. Furthermore, even if a weather change such as a typhoon or snowfall occurs, such steel towers cannot be easily removed, and in the worst case, there is a risk of collapse, which poses many problems.

For this reason, improvements were made to the wire stretching method itself, and a sling method was proposed in which the wire body sagged less during wire stretching. As shown in FIG. 6, in this construction method, a main rope 10 is stretched between the steel towers A and B, and the upper sheave 11a of the hanging wheel 11 runs on the main rope 10, and is connected with a spacing wire 12. Then, the hanging wheel 11.11 is unfolded, and the mesh wire 4 is extended to the lower sheath 711b. It is true that with this construction method, the sagging of the filament is smaller than in the conventional wire stretching method, but if the spacing wire breaks or the metal wheel itself is damaged, unexpected sagging will occur. Therefore, for safety reasons, the construction of the protective scaffolding cannot be omitted.

In view of these circumstances, the present invention has a simple configuration, is inexpensive, can be freely applied regardless of geographical conditions, and can be used repeatedly and repeatedly for general purposes without constructing an exaggerated steel tower as described above. The purpose of this invention is to provide a possible protective frame and a method for extending wire across obstacles using the same.

[Summary of the Invention] That is, the present invention provides a protection frame configured to have a space in which a wire drawing tool having a filament body can pass through above an obstacle to cross-draw the wire, and By extending the wire body through the wire, even if the wire body sag during the wire extension, the protective frame will prevent it from sagging and prevent the wire from running over an obstacle. This is because the striatum of the body was prevented from falling directly.

[Example] Hereinafter, as shown in FIG. 5, an example will be described in which a super high voltage power transmission line is extended across an extra high voltage line as an obstacle.

In the present invention, when extending the special high voltage line 20 across the special high voltage line 20, the protective scaffolding 40 is not constructed as shown in FIG. Protective frames 1, 1 are stretched between the steel towers A and B by support wires 2 so as to cover at least the upper part of the special high voltage line 20. For this support wire 2, an insulating lobe with high tensile strength, such as Kevlar (trade name of Aramid), is suitable, but since it is difficult to suddenly tension such a support wire 2, first, a pilot of an appropriate diameter is selected. It is preferable to tension the row 12' and then replace it with the support wire.

This pilot loaf 2' can be stretched by any suitable method such as a balloon or hand-stretched wire, but it is convenient to use the ground wire 21 of the existing special high voltage line 20 as shown in FIG. In other words, t! 50 and one end 53 fixed to the steel tower A, the pilot row 12' is passed through the pulley 51 of the opposite steel tower B via the self-propelled machine 50, and the other end of the rope 2- is wrapped around the winch 52. I'll do it. Once set in this way, wind the rope 2' little by little with the winch 52 to prevent the rope 2' from loosening, and then lower the rope 2' onto the self-propelled machine 50.
, and bring the rope 2' to the position indicated by the dashed-dotted line in FIG. Collect it back to the steel tower on the negative side (it is a good idea to attach a pull-back rope to the self-propelled machine in advance for recovery)
So do it. Once the pilot row 12- has been tensioned, the protective frames 1, 1 are replaced with a support line 2 which is appropriately connected.

FIG. 3 is a front view showing one specific example of the protective frame 1 used in the above, and FIG. 4 is a side view thereof. In this example, solid or hollow rod-shaped bodies 1a, 1a made of an insulating material are connected in a cage shape by a convergence ring 1b to form a hollow cylindrical body. Thus, the hollow portion 1e is configured to have a size such that a wire extending tool can pass through the interior thereof when extending the electric wire. Roughly speaking, the cage-shaped cylindrical body is divided into two parts, which are connected so that they can be opened and closed, for example, by a hinge 1d, and are detachably fixed on the other side with a hook or the like (not shown), so that they can be opened, closed, and removed from the striate body. Configured to facilitate. In FIG. 3, reference numeral 10 denotes a connecting piece for connecting the support line 2 or the protective frame 1 to each other.

As shown in Fig. 1, the protective frames 1, 1 configured as described above are connected in a number that can sufficiently cover the upper part of the special high voltage line, and are stretched with support wires 2. A wire wire 4 is passed through the hollow interior of the wire wire 4, and an electric wire is connected to the end of the wire wire 4 via a wire drawing tool such as a wire wire clamp, and the electric wire is protected together with the wire drawing tool. The wire is extended through the hollow of the frame. Since the configuration is as described above, if the wire tension decreases, for example, the Metsenger wire 4 (or electric wire)
Even if it hangs down as shown in the figure, the protective frames 1 and 1 will stop the hanging above the extra high voltage line as shown in Figure 2, and it will not fall onto the extra high voltage line. be. In Figures 1 and 2, 3 is a metal wheel for wire extension.

In addition, in order to allow the Messenger wire 4 to pass through the protective frame 1 in the above, a pilot rope, which is separately replaced with the Messenger wire, is passed through the protective frame when the protective frame 1 is connected and deployed using the support wire 2. After the protective frame 1 is unfolded and set at a predetermined position, the pilot rope may be replaced with the messenger wire 4.

The specific examples explained above are just examples, and when the obstacle is a road, the material constituting the protective frame does not necessarily have to be an insulating material, but a mechanically strong material such as metal. If there is no need to take wind pressure into account, it may be constructed as a cylinder itself rather than in a basket shape, and the material of the support wire can be selected appropriately. Of course, the design can be changed as necessary. Zarani again,
The wire extension method when using the protective frame according to the present invention is not limited to the conventional loop wire extension or pull-in wire extension, but the above-mentioned sling method can also be applied. In this case, the protective frame may be placed between the metal wheels, or the metal wheel may penetrate through the inside of the protective frame. In this case, the metal wheel is a type of wire drawing tool according to the present invention. In general, another support line may be further passed through the inside of the protective frame in order to ensure safety. In addition, in order to make it easier when the end of the wire is drawn into the protective frame, an umbrella-shaped jig is attached to the end of the wire, and the jig is inserted into the entrance of the protective frame. It may also be possible to constrict the end of the wire and wrap it around the end of the wire so that it can pass smoothly through the frame. In addition, if the number of protective frames installed increases and there is a risk that frictional resistance will increase, a ball bearing effect can be exerted by attaching a rotating body shaped like an abacus ball to the convergence ring or the like.

[Effects of the invention] As described above, with the wire extension method and protective frame according to the present invention, the entire structure is suspended, so it can be used freely regardless of the structure, nature, or location of obstacles under the wire extension. Unlike conventional scaffolding, there is no need to cut power to high-voltage lines on the obstacle side, and the overall structure is simple, making it extremely easy to install and remove, reducing costs significantly. Not only is it possible to reduce the cost, but because the entire structure is lightweight, there is no need to reinforce the tower, and each part used has versatility and can be used repeatedly, eliminating the need to record expensive depreciation costs. This invention is unnecessary and does not generate waste such as concrete pieces as in the case of conventional scaffolding steel tower construction, and exhibits the excellent effects unique to the present invention, and its industrial significance is enormous. There is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing how the wire drawing method according to the present invention is carried out, FIG. 2 is an explanatory diagram showing the state in which the filament body sag during wire drawing, and FIG. is a front view showing one embodiment of the protective frame according to the present invention, FIG. 4 is a side view of FIG. 3,
Figure 5 is an explanatory diagram showing the construction status of conventional protective scaffolding, Figure 6
The figure is an explanatory diagram showing an example of the hanging metal method, and FIG. 7 is an explanatory diagram showing an example of the pilot rope installation method. DESCRIPTION OF SYMBOLS 1... Protection frame body, 1a... Rod-shaped body, 1b... Convergence ring, 1e... Space part, 2... Support line, 3... Metal wheel, 4... Metsenger wire .

Claims (5)

[Claims] (1) When extending a filament across an obstacle, at least the area above the obstacle can be sufficiently covered;
A protective frame whose inside is configured to have a space through which a wire extending tool for the filament body can pass is stretched, and the filament body is extended by penetrating the space of the stretched protective frame body. Extension method without scaffolding. (2) The wire extension method according to claim 1, wherein the filament is an overhead power transmission line or an overhead ground wire. (3) Claim 1 in which the protective frame and the rope stretching the protective frame are made of an insulating material.
Or the wire extension method described in Section 2. (4) The wire stretching method according to claim 3, wherein the rope is made of Kevlar (trade name of Aramid). (5) The inside is formed into a space through which the wire ends of the wire body can pass, and the cage itself is composed of a two-split joint that can be attached to and detached from the wire body, and has a cage-like body with both ends attached. A protective frame body used for wire extension without scaffolding, which is provided with connecting pieces for tensioning.