JPH0833169A - Suspension support and wiring work method for the suspension support - Google Patents

Abstract

PURPOSE:To lower the height of a suspension support so as to improve the effect of preventing the falling of a thunderbolt by providing an arm for overhead ground wire projecting from the tip of an insulating arm, in parallel with the insulating arm, over the insulating arm at the uppermost stage, and annexing an overhead ground wire. CONSTITUTION:A suspension support 28 is constituted of a pole 28a, and insulating arms 23 are provided in three stage above and below so as to from a contact transmission line. At the apex of the pole 28a is provided an arm 30 whose tip projects outward from the insulating arm 23. In the vicinity of both ends of the arm 30 for an overhead ground wire is an overhead ground wire 31 arranged in parallel with the transmission line 6. The insulating arm 23 is composed of an oblique material 23 and a horizontal material 21 where high polymer insulators such as umbrella silicon rubber, or the like, are provided around the rods of insulating rods by FRP, or the like, and the base sides are coupled with the pole 28a, and the tip sides are coupled with each other by a yoke 24. Hereby, thunder shield angle theta to the cable of the overhead ground becomes approximately 0 deg., and the thunder damage is prevented, and the height of the overhead ground wire, accordingly, the height of the pole is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension support for a compact power transmission line having an insulating arm and a method for operating a suspension line on the suspension support.

[0002]

2. Description of the Related Art In a conventional suspension tower in a general overhead transmission line, a suspension device is attached near the tip of a steel tower arm provided on each side of the steel tower body, and an electric wire is connected to this suspension device and the uppermost stage is installed. A single overhead ground wire is installed at the top of the tower so that a predetermined lightning shielding angle is secured for a pair of electric wires that are installed on the steel tower arm. As shown in FIG. 6, the suspension device attached to the conventional steel tower arm includes a yoke 3 connected to a steel arm 2 (a member of which is shown in the figure) of the suspended steel tower, and an insulator having a predetermined electrical insulation performance. The suspension 4, a yoke 5 on the line side, and a suspension clamp 7 for supporting the electric wire 6 are provided. Further, arc horns 8 and 9 and shield rings 10 and 11 are attached to the yokes 3 and 5, respectively.

As a conventional overhead wire working method for a suspended steel tower, first, when the electric wire 6 is extended, as shown in FIG. Is suspended from the steel arm 2. The wire 6 is extended by passing the electric wire 6 through the groove groove of the drawing wire wheel 16. In this case, the drawing wire wheel 16 is arranged such that the wheel groove is at the same height position as the position of the electric wire 6 of the suspension clamp 7 of the suspension device. After drawing the wire, adjust the sag until the sag is reached. Then, while suspending the suspension device 1 from the steel arm 2 in the vicinity of the gold wire cord 15, for example, from the steel arm 2 as well, for example, a lever block (a structure similar to a chain block, which is hoisted and unwound by lever operation) 1
8 and the like, the electric wire lifting hook 17 as shown in FIGS. 8 (a) and 8 (b) is lowered, and the electric wire 6 on the wire drawing wheel 16 is taken into the electric wire lifting hook 17 and then the taken electric wire. 6 is accommodated (transferred) in the suspension clamp 7 and grasped. In this way, the tight line ends.

[0004]

By the way, in recent years, there has been an increasing demand for a compact power transmission line in which the entire overhead power transmission line is made as small as possible, and as a means for achieving this, a suspended support using an insulating arm has been studied. There is. As shown in FIG. 9, an example of a suspended support using this insulating arm is such that the insulating arms 23 are provided in three upper and lower stages on both sides of the support body 28a, and a predetermined overhead ground wire height (the uppermost insulation A top portion is formed at a position (height from the horizontal member of the arm 23 to the overhead ground wire 29) h, and one overhead ground wire 2 is provided at this top portion.
9 is the overhead line. As a result, the lightning shielding angle θ is secured for the electric wire 6 that is connected to the insulating arm 23, and lightning strikes the electric wire.

The insulating arm 23 will be described with reference to FIGS. 4 (a) and 4 (b), which are one embodiment of the present invention.
A structure using members 21 and 22 provided with polymer insulators 21b and 22b made of silicon rubber or the like having an umbrella shape similar to that of a conventional porcelain insulator on the outer circumferences of shafts 21a and 22a made of insulating material. It has both the function and the function as an insulating support member (the same function as the conventional porcelain insulator).
The insulating arm 23 shown in FIG.
It is an insulating arm having a two-piece structure in which two and two are combined.
In this case, the yoke 24 connected to the tip of the insulating arm 23
The suspension clamp 26 holding the electric wire 6 is directly attached to. Further, the wire drawing wheel 25 is also directly attached to the yoke 24 when the wire is drawn.

Suspended support 2 having the above-mentioned insulating arm 23
8, when the wire 6 is transferred from the wire drawing wheel 25 to the suspension clamp 26 when the wire drawing is performed,
Are arranged so that the wheel groove is at the same height as the position of the electric wire 6 of the suspension clamp 26. It is necessary to lift the electric wire 6 just under the yoke 24 by about 10 cm from the groove wheel of the drawing wheel 25, but it is difficult to perform this operation by the conventional method using the lever block 18 or the like. That is, in the case of the conventional suspension device 1, there is a sufficient height distance from the steel arm 2 to the suspension clamp 7, and therefore a sufficient height distance is also provided between the steel arm 2 and the wire drawing wheel 16. Since the lever block 18 and the like can be used, the work of transferring the electric wire 6 as described above can be easily performed. However, in the case of the suspension support 28 having the insulating arm 23, as shown in FIG. In addition, since the height distance between the insulating arm 23 and the drawing wire wheel 25 becomes extremely short, there arises a problem that the conventional method using a lever block or the like cannot be adopted. Further, the overhead ground wire 29 has a height h of the overhead ground wire in order to secure an effective lightning shielding angle θ with respect to the pair of electric wires 6 on the tip side of the insulating arms 23 provided on both sides of the suspension support 28. Becomes higher, and as a result, the support body 2
There arises a problem that the height of 8a becomes large.

The present invention has been made in view of the above circumstances, and in a suspension support provided with an insulating arm, when an overhead wire work is performed, the wire is easily lifted from the wire drawing wheel to the tip to form a suspension clamp. It is an object of the present invention to provide a suspension support that can be accommodated, can be made low in height, and can be enhanced in lightning strike prevention effect, and a method of operating a catenary to the suspension support.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 is a suspension support equipped with an insulating arm on the tip of which an electric wire is suspended and supported by a suspension clamp. An overhead ground wire arm is provided above the upper insulation arm in parallel with the insulation arm, and the tip side projects outward from the tip of the insulation arm. An overhead ground wire arm is provided near the tip of the overhead ground wire arm. It is characterized by the provision of lines.

According to a second aspect of the present invention, the insulating arms are provided on both sides of the support body, and one wire is provided at each end of the insulating arms, while at the other end of the overhead ground wire arm. One aerial ground wire is provided along each of the electric wires.

A third aspect of the present invention is an overhead wire work method for connecting an electric wire to the suspension support according to the first aspect, wherein the wire is located directly above or outside the electric wire near the tip of the overhead ground wire arm. It is characterized by attaching a flywheel to a cable and lifting the wire with a wire lifting tool attached to the tip of the wire rope passed through the flywheel.

[0011]

In the above suspension support, since the tip of the overhead ground wire arm projects outward from the tip of the insulating arm, it is suspended above or in the vicinity of the wire suspended by the suspension clamp at the tip of the insulating arm. Since the ground wire is located, the lightning shielding angle θ of the overhead ground wire with respect to the electric wire becomes approximately 0 °, and it is not necessary to increase the height h of the overhead ground wire, so that the height of the entire suspension support also decreases.

According to the second aspect of the invention, when the insulating arms are stretched on both sides of the support body, the overhead ground wire arms are also provided on both sides of the support body. The overhead ground wire provided with each one of the lines is located above the electric wire provided with one line of each at the tip of the insulating arm. For example, if the overhead ground wire is located outside the tip of the insulating arm, 2
Since the wire is located inside the overhead ground wire of the strip, the lightning shielding angle for the wire for the overhead ground wire is 0 ° or less, and the lightning strike prevention effect is significantly enhanced.

In the overhead wire work method of the third aspect, for example, when applied to a tight wire work after the wire is extended, a flywheel is attached directly above or outside the electric wire near the tip of the overhead ground wire arm. Then, pass the wire rope with the wire lifting tool attached to the tip through the flywheel, operate the wire rope to position the wire lifting tool near the tip of the insulating arm, and then move the wire groove of the drawing wire wheel. After the wire is passed through the wire, the wire rope is pulled up and wound up, so that the wire is lifted by the wire lifting tool and removed from the wire car. Then, the wire drawing wheel is removed from the yoke, the wire is received and held in the suspension clamp, and then the suspension clamp is attached to the tip of the insulating arm. As a result, the wire is transferred from the wire drawing wheel to the suspension clamp.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of the suspension support of the present invention. This suspension support 28 is an insulating arm 23 as an arm of a support body (the example shown is not a steel tower but a pole made of steel pipe) 28a. It is a suspension support for the compact transmission line used. In this suspended support 28, horizontal insulating arms 23 are provided on upper and lower sides of a support body 28a in three stages. An aerial ground wire arm 30 is provided at the top of the support body 28a so that the tip end thereof projects outward from the insulating arm 23. Further, overhead ground wires 31 are arranged in parallel with the electric wires 6 near both ends of the overhead ground wire arm 30.

As described above with reference to FIG. 4, the insulating arm 23 is provided with polymer insulators 21b and 22b made of silicon rubber or the like and having an umbrella shape similar to that of a conventional porcelain insulator on the outer periphery of shafts 21a and 22a made of an insulating material such as FRP. The structure using the members 21 and 22 has both the function as an arm and the function as an insulating support member (the same function as the conventional porcelain insulator). The horizontal member 21 and the diagonal member 22 are respectively connected to the support body 28a at their base ends through connecting fittings 21c and 22c, and connected to the yoke 24 at their distal ends via connecting fittings 21d and 22d. The illustrated insulating arm 23 is an insulating arm having a two-piece structure in which the horizontal member 21 and the diagonal member 22 are combined. FIG. 4A shows a state in which the overhead power transmission line has been extended in the work of constructing the overhead transmission line, and the electric wire 6 is passed through the gold wheel groove of the extension wire wheel 25 attached to the yoke 24. Further, FIG. 4B shows a state where the overhead wire work is completed and the suspension clamp 26 is attached to the yoke 24 at the tip of the insulating arm 23.

The overhead ground wire arm 30 includes a support body 28.
An arm body 30a disposed in parallel with the insulating arm 23 on the top of a, and a slant member 3 attached between the tip of the arm body 30a and the vicinity of the top of the support body 28a.
0b and the truss structure. Each of the overhead ground wires 31 is suspended near both ends of the overhead ground wire arm 30 (two wires in total). The overhead ground wire 31 is the insulating arm 2
It is located above the electric wire 6 supported by the suspension clamp 26 at the tip of the wire 3 and is slightly hung outside. Therefore, the horizontal distance between the two overhead ground wires 31 is larger than the horizontal distance between the pair of electric wires 6. In this embodiment, since the overhead ground wire 31 is located slightly outside the electric wire 6,
The lightning shielding angle θ of the overhead ground wire 31 with respect to the electric wire 6 becomes 0 ° or less, which makes it possible to reduce the height h of the overhead ground wire and to significantly improve the effect of preventing lightning strikes on the electric wire 6.

The overhead ground wire arm 30 is usually provided with a vertical load such as a load due to the weight of the arm 30 itself, a load due to the weight of the overhead ground wire and its accessories, a wind load applied to the arm 30, an overhead ground wire, and the like. It has strength considering the wind load applied to this accessory and the horizontal load applied by the torsional force generated by the cutting of the overhead ground wire. Further, the overhead ground wire arm 30 of the present embodiment has a load generated in the overhead wire work of the electric wire 6 in addition to the above-mentioned load, that is, the electric wire 6 as a vertical load.
It has a strength that adds the weight of itself and the lifting tool described later, and the wind load applied to the electric wire 6 and the lifting tool during the overhead wire work as a horizontal load.

Next, a method of overhanging the electric wire 6 when the electric wire 6 is installed on the suspension support 28 of the above embodiment will be described with reference to FIGS. In the suspension support 28 of FIG. 2, the drawing wire wheel 25 is suspended on the yokes 24 of the insulating arms 23 on both sides,
The extended electric wire 6 is passed through the gold wheel groove of the wire drawing wheel 25.

Next, a tight wire operation is performed, but the flywheel 32 is located near the tip of the overhead ground wire arm 30 just above or outside the electric wire 6 that has been passed through the drawing wire wheel 25. In addition to the above, the flywheel 33 is also attached to the base end of the overhead ground wire arm 30. Next, attach the wire rope 35 with the lifting hook 34 attached to the tip thereof to the hook metal wheel 3
Pass it through 2, 33 and lower the base end side to the ground, for example. Then, after adjusting the sag of the electric wire 6 until the sag becomes the specified sag, the electric wire 6 on the wire drawing wheel 25 is transferred to the suspension clamp 26. At the time of this transfer, the wire rope 35
Is sent to the tip side to lower the lifting hook 34 to the vicinity of the tip of the insulating arm 23, and after the lifting hook 34 is hooked on the electric wire 6 that is passed through the metal wheel groove of the drawing wire wheel 25 (FIG. 4).
(See (a)), by winding the wire rope 35,
The electric wire 6 is lifted up by, for example, about 10 cm by the lifting hook 34 and removed from the wire drawing wheel 25. Then, the wire drawing wheel 25 is removed from the yoke 24 at the tip of the insulating arm 23, and the electric wire 6 is accommodated and held in the suspension clamp 26, and
As shown in (b), the suspension clamp 26 is attached to the yoke 24.
Attach to As a result, the wire 6 is transferred from the wire drawing wheel 25 to the suspension clamp 26. After work,
It is advisable to remove the Tobito wheels 32 and 33. From the viewpoint of workability, it is preferable to perform the above-mentioned tensioning work on the insulating arms 23 at the upper, middle, and lower stages on one side in the order of the lower stage, the middle stage, and the upper stage.

By the way, in the compact transmission line, it is required to reduce the distance between the vertical lines as much as possible.
As shown in FIG. 3, a vibration resistant suspension clamp (AGS clamp) 46 having a short metal fitting height may be used. The vibration-proof suspension clamp 46 clamps the central part of the armor rod 47 wound on the outside of the electric wire 6, and the central part of the armor rod 47 elastically grips the electric wire 6 via an insert 48 such as chloroprene rubber. It is a structure that does.

When the above-mentioned seismic suspension clamp 46 is used as the suspension clamp, it is necessary to avoid the length of the armor rod 47 and to hold the electric wire 6 horizontally. not,
As shown in FIG. 3, it is preferable to use a two-point hanging tool 40 that holds the electric wire 6 at both positions of the armor rod 47. The illustrated two-point hoisting tool 40 has a structure in which metal wheels 40b for holding the electric wires 6 are attached to both sides of the horizontal member 40a, and the wire rope 35 is connected to both ends of the horizontal member 40a.

In the suspension support 28 of the above embodiment,
The work for attaching the insulating arm 23 to the support body 28a can be performed using the overhead ground wire arm 30, and the lifting and attaching of the insulating arm 23 can be performed easily and safely. In this case, the overhead ground wire arm 30 has a load generated when the insulating arm 23 is attached to the support body 28a, that is, the weight of the insulating arm 23 itself and the hoisting tool as a vertical load, and a mounting work as a horizontal load. The strength is such that the wind load applied to the insulating arm 23 and the hoisting tool is added to the above-mentioned load that is normally generated in the overhead ground wire arm.

Next, a second embodiment of the present invention will be described with reference to FIG. The suspension support 50 of the second embodiment is for one line in which an insulating arm 52 made of a horizontal material is provided in upper and lower three stages only on one side of the support body 50a. Is provided in parallel with the insulating arm 52, and is provided with an overhead ground wire arm 53 whose tip end side projects outward from the insulating arm 52. A yoke 54 is attached to the tip of each insulating arm 52, and the electric wire 6 held by a suspension clamp 55 is suspended on the yoke 54. Further, near the tip of the overhead ground wire arm 53, the overhead ground wire 56 is located above the electric wire 6 and slightly outside the electric wire 6. The overhead ground wires 31 and 56 may be slightly inside the electric wire 6.

[0024]

According to the suspended support of the present invention, the lightning shielding angle θ of the overhead ground wire with respect to the electric wire becomes approximately 0 °, and the overhead ground wire height, that is, from the horizontal member of the insulating arm to the overhead ground wire. The height can be reduced, and the height of the entire suspended support can be reduced accordingly. Also, the lightning strike prevention effect is enhanced.

According to the second aspect of the present invention, each wire is suspended above and supported by one end of each of the insulating arms. Furthermore, if the two overhead ground wires are located outside the two electrical wires, the lightning shielding angle of the overhead ground wires with respect to the electrical wires becomes 0 ° or less, and the lightning strike prevention effect can be significantly improved.

In the overhead wire work method of the third aspect, since the flywheel is disposed at the tip of the overhead ground wire arm and the wire is lifted by the wire lifting tool attached to the wire rope through which the flywheel is passed. For example, it is possible to easily and safely perform the work of transferring the electric wire from the drawing wire car to the suspension clamp in the tight-tie work. Also, lifting work of the insulating arm attached to the support body can be performed.

[Brief description of drawings]

FIG. 1 is a front view of a suspension support according to an embodiment of the present invention.

FIG. 2 is an explanatory view for explaining an operation of transferring an electric wire from a wire drawing wheel to a suspension clamp, which is one of the operations of the overhead wire of the suspension support of FIG.

FIG. 3 is a front view showing an example of an electric wire lifting tool used at the time of transferring electric wires in FIG.

4 (a) is an explanatory view showing a state in which an electric wire is suspended and supported by a gold wheel on the yoke of the insulating arm in FIG. 1, FIG. 4 (b).
Similarly, it is an explanatory view of a state in which an electric wire is suspended and supported by a suspension clamp.

FIG. 5 is a front view of the suspension support according to the second embodiment of the present invention.

FIG. 6 is a front view of a conventional suspension device.

FIG. 7 is an explanatory view for explaining a procedure for taking in an electric wire from a wire drawing wheel to a suspension clamp by a conventional method during a tight line.

8 shows the electric wire lifting hook in FIG. 7, where FIG. 8A is a front view and FIG. 8B is a side view.

FIG. 9 is a front view of a suspension support in a conventional compact power transmission line.

FIG. 10 is an explanatory diagram illustrating an operation of transferring an electric wire from a wire drawing wheel to a suspension clamp, which is an example of an overhead wire operation in the suspension support of FIG.

[Explanation of symbols]

 6 Electric wire 23,52 Insulation arm 26,55 Suspension clamp 28,50 Suspended support 28a, 50a Support body 30,53 Overhead ground wire arm 31,56 Overhead ground wire 32 Tobito car 34 Electric wire lifting hook (electric wire lifting tool) 35 wire rope 40 2-point lifting tool (wire lifting tool)

Claims (3)

[Claims] 1. A suspension support having an insulating arm on the tip of which an electric wire is suspended and supported by a suspension clamp, the suspension main body being disposed above the uppermost insulating arm in parallel with the insulating arm. A suspended support, wherein an overhead ground wire arm having a tip end side protruding outward from the tip end of the insulating arm is provided, and the overhead ground wire is provided near the tip end of the overhead ground wire arm. 2. The insulating arms are provided on both sides of the support body, and each of the insulating arms is provided with a single wire at the tip thereof, while the tip of the overhead ground wire arm is provided along the wires. A suspended support characterized in that one overhead wire is provided for each. 3. The overhead wire working method for overhanging an electric wire on the suspension support according to claim 1, wherein a flywheel is attached to the vicinity of the tip of the overhead ground wire arm just above or outside the electric wire. , A method for overhead wire work on a suspended support, characterized in that the wire is hoisted with a wire hoisting tool attached to the end of the wire rope that has been passed through the Tobira train.