JP3401752B2 - Overhead wire work method for suspended supports - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a general suspension tower of an overhead power transmission line, there is known one in which an electric wire is installed by using an overhead wire work method as shown in FIG. The overhead wire work is performed in a wire extension section in which a plurality of suspended steel towers 1 are installed at predetermined intervals. An electric wire drum 3 for supplying an electric wire 2 and a wire drawing wheel 4 for applying a tension to the electric wire 2 are provided outside the suspended steel tower 1 on one end side of the wire drawing section, and a steel tower 1 on the other end side of the wire drawing section. A winch 6 for winding the wire rope 5 is provided on the outside. Further, a wire drawing wheel 7 is attached to the steel tower arm 1a of each suspended steel tower 1.
As shown in FIGS. 10 and 11, the wire drawing wheel 7 is provided with an electric wire 2
A gold wheel main body 7a having a gold wheel groove through which the metal wheel passes is attached to a support frame 7c rotatably by a rotating shaft 7b.
And after arranging the wire rope 5 for wire-drawing by the hand-drawn wire in the wire-drawing section between each suspended steel tower 1, this wire-wire 5 for wire-drawing is connected to the wire-drawn vehicle 4 and the steel tower arm 1a of the uppermost stage of the steel tower 1. It is laid between the drawing wheel 7 and the winch 6. Further, the three electric wires 2 are connected to one end of the wire rope 5 for wire extension through the yoke 8, and the winch 6 and the wire drawing wheel 4 cooperate to connect the other end side of the wire rope 5 for wire extension. By winding with the winch 6, the electric wire 2 is laid between the towers 1 in the extended wire section. Meanwhile, wire rope 5 and wire 2 for wire extension
When the connection part (yoke 8) with is close to the tower 1,
The wires 2 are connected to each other and the electric wire 2 is arranged on the wire car 7 for wire suspension suspended on each steel tower arm 1a. This wire rope for wire 5
The electric wire 2 is laid by repeating the winding and wire crossing, and replacing the wire rope 5 for wire extension in the wire extension section with the electric wire 2.

After the electric wire 2 has been laid on the wire drawing wheel 7, the wire 2 is transferred from the wire drawing wheel 7 to the suspension device 11 permanently installed on the steel tower arm 1a. Done. FIG. 12 shows a suspension device 11 attached to a conventional steel tower arm 1a, including a yoke 13 connected to the steel arm 1a of the suspension steel tower 1, an insulator string 14 having a predetermined electrical insulation performance, and a line side. The yoke 15 and the suspension clamp 17 for supporting the electric wire 2 are provided. Further, the yokes 13 and 15 have arc horns 18a and 18b, respectively.
And shield rings 19a and 19b are attached.

The wire car 7 for wire drawing is attached to the tower arm 1a so that the groove of the wire car is at the same height as the position of the electric wire 2 supported by the suspension clamp 17 of the suspension device 11. The wire 2 extended to the gold wheel 7 is adjusted in slack until the wire reaches a specified slack after the wire is drawn, and then the suspension device 11 is hung from the steel tower arm 1a in the vicinity of the gold wire cord 15 as well. An electric wire lifting hook 2 as shown in FIGS.
After lowering 1 and taking in the electric wire 2 on the wire drawing wheel 7 to the electric wire lifting hook 21, the electric wire 2 taken in is accommodated (transferred) in the suspension clamp 17 and grasped. In this way, the cording work is completed. When the electric wires 2 are installed on both sides of the steel tower arm 1a, a predetermined lightning shielding angle is secured at the top of the suspended steel tower 1 for the pair of electric wires 2 installed on the uppermost steel tower arm 1a. A single overhead ground wire is installed at such a height.

[0005]

By the way, in recent years, there is an increasing demand for a compact power transmission line in which the entire overhead power transmission line is made as small as possible, and a suspension support using an insulating arm has been studied as a means for realizing the demand. There is. As shown in FIG. 15, an example of a suspended support using this insulating arm is such that the insulating arms 23 are arranged in three steps on both sides of the support body 28a.
And a predetermined height of the overhead ground wire (the height from the horizontal member of the uppermost insulating arm 23 to the overhead ground wire 29) h
A top portion is formed at the position, and a single overhead ground wire 29 is installed on this top portion. As a result, a lightning shielding angle θ is secured for the electric wire 2 that is connected to the insulating arm 23, and lightning strikes the electric wire 2.

The insulating arm 23 will be described with reference to FIG. 6, which is an embodiment of the present invention. The insulating arm 23 has an umbrella shape similar to a conventional porcelain insulator around the shafts 21a and 22a made of an insulating material such as FRP. Polymer insulators 21b, 22 such as silicone rubber
This is a structure using the members 21 and 22 provided with b, and has both a function as an arm and a function as an insulating support member (the same function as a conventional porcelain insulator). 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. In this case, the suspension clamp 26 holding the electric wire 2 is directly attached to the yoke 24 connected to the tip of the insulating arm 23. In addition, FIG.
When the wire is drawn, the wire drawing wheel 25 is also directly attached to the yoke 24 as shown in FIG.

Suspended support 2 having the insulating arm 23 described above
8, when the wire 2 is transferred from the wire drawing wheel 25 to the suspension clamp 26 at the time of a tight line, the wire drawing wheel 25 has a metal wheel groove at the position of the wire 2 of the suspension clamp 26. Arrange them so that they are at the same height. It is necessary to lift the electric wire 2 just under the yoke 24 by about 10 cm from the metal groove of the wire drawing wheel 25, but it is difficult to perform this work by the conventional method using the lever block 20 or the like. That is, in the case of the conventional suspension device 11, FIG.
2. As shown in FIG. 13, there is a sufficient height distance from the steel tower arm 1a to the suspension clamp 17, and therefore there is also a sufficient height distance between the steel tower arm 1a and the wire drawing wheel 7, The block 20 and the like can be used, and the transfer work of the electric wire 2 as described above is easy. Since the height distance between the wire drawing wheel 25 and the wire drawing wheel 25 becomes extremely short, 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 2 on the tip side of the insulating arms 23 provided on both sides of the suspension support 28. Becomes higher,
As a result, the problem arises that the support body 28a becomes high.

The present invention has been made in view of the above circumstances, and it is possible to efficiently and safely perform wire-drawing work and tight-tie work when performing overhead wire work on a suspension support provided with an insulating arm. It is an object of the present invention to provide a method for overhead line work in a suspended support, which is capable of reducing the height of the suspended support and enhancing the lightning strike prevention effect.

[0009]

In order to solve the above-mentioned problems, the invention of claim 1 is provided with a suspension clamp for supporting an electric wire at the tip of an insulating arm provided on the suspension support, and further at the top of the suspension support. , An overhead ground wire arm is provided above the uppermost insulating arm in parallel with the insulating arm, and the tip side thereof projects outward from the tip of the insulating arm,
A multiple wheel sheave that can carry multiple electric wires is provided slightly inside the tip of this overhead ground wire arm, and a plurality of wheel sheaves connected to the rear end of the wire rope for wire extension are connected to this multiple wheel sheave via a yoke. The feature is that the two electric wires are placed side by side in a horizontal state and are connected at once.

A second aspect of the present invention is the overhead line work method of the first aspect.
There are, said near the tip of ground wire arm, said mounting Tobi gold car directly above or from a position outside of the wire which is supported on the tip of the insulating arm, the tip of the wire rope through the kite gold car to the wire lifting tool fitted, an electric wire that is overhead line to the plurality goldfish vehicle, and a Rukoto transferred to a suspension clamp provided at the front end of the insulating arm and feature.

A third aspect of the invention is an overhead line work method according to the first aspect.
And , after the electric wire is suspended at the tip of the insulating arm,
An overhead ground wire is provided near the tip of the overhead ground wire arm.

[0012]

[Operation] In the overhead wire work method for the above-mentioned suspended support,
An overhead ground wire arm whose tip projects outward from the insulating arm is provided at the top of the suspension support, and a suspension clamp is installed at the tip of the insulating arm to suspend the wire. The above-mentioned ground wire arm is provided with a multi-wheel wheel car in which groove wheels having the same or more number of wheels as the number of electric wires to be connected are connected, for example, in the case of connecting three electric wires, a three-wheel wheel car is attached. . Then, a plurality of electric wires connected to the wire rope for wire extension through the yoke are mounted on the three-wheeled gold wheel. In this wire-drawing work, since three wire cars to be connected and three wheels with the same number of wheels are installed in the overhead ground wire arm, the wires are distributed to each insulating arm even if they are close to the suspended support. There is no need to go, and the wire is continuously extended to the three-wheel gold-plated car between the suspended supports.

In the overhead wire working method for a suspension support according to a second aspect of the present invention, the above-mentioned suspension of the tip of the overhead ground wire arm is performed in a state in which an electric wire is installed on, for example, a three-wheel car provided on the overhead ground wire arm. Install a flywheel directly above or outside the clamp. Pass the wire rope through this flywheel, attach the wire lifting tool to the tip of this wire rope,
Using this wire hoisting tool, each wire that is suspended on a three-wheel car is hoisted and transferred to the suspension clamps on the lower insulating arm.

In the method for operating the overhead wire of the suspension support according to the third aspect of the invention, since the tip of the overhead ground wire arm projects further outward than the tip of the insulating arm, the true wire of the electric wire suspended by the suspension clamp at the tip of the insulating arm is provided. Since the overhead ground wire is located above or in the vicinity of it, the lightning shielding angle θ of the overhead ground wire with respect to the electric wire becomes around 0 ° or less than 0 °, and the effect of preventing lightning strikes is enhanced and the height h of the overhead ground wire must be increased. Therefore, the height of the suspension support as a whole can be kept low.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a suspension support which has been suspended by the method of the present invention.
Reference numeral 8 denotes a suspension support for a compact power transmission line in which an insulating arm 23 is used as an arm of a support body 28a (a pole made of steel pipe or the like, not a steel tower in the illustrated example). The suspension support 28 has three horizontal insulating arms 23 vertically provided on both sides of a support body 28a. 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. In addition, the overhead ground wire 31 is provided near both ends of the overhead ground wire arm 30.
Are arranged in parallel with the electric wire 2.

As described above with reference to FIG. 6, 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 circumference 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 connected at their base ends to the support body 28a via connecting fittings 21c and 22c, and at the tip end to the yoke 24 via connecting fittings 21d and 22d. The insulating arm 23 shown in the figure is an insulating arm having a two-piece structure in which a horizontal member 21 and a diagonal member 22 are combined, and a suspension clamp 26 is attached to the tip of the insulating arm 23 and further suspended. The electric wire 2 is accommodated and grasped in the clamp 26.

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 0b form a 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 located above the electric wire 2 supported by the suspension clamp 26 at the tip of the insulating arm 23, and is suspended slightly outside. Therefore, the horizontal distance between the two overhead ground wires 31 is larger than the horizontal distance between the pair of electric wires 2. In this embodiment, since the overhead ground wire 31 is located slightly outside the electric wire 2, the lightning shielding angle θ of the overhead ground wire 31 with respect to the electric wire 2 is 0 ° or less, which reduces the height h of the overhead ground wire. In addition, the effect of preventing lightning strikes on the electric wire 2 can be significantly improved.

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 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. Furthermore, in addition to the above-mentioned load, the electric wire 2
Load generated at the time of overhead wire work, that is, a load of at least six electric wires 2 and a load of two overhead ground wires 31 as a vertical load, and a load of a multi-wheel wagon and a flywheel wagon that wire the electric wire 2 described later, Furthermore, the strength of the weight of the hoisting tool and the wind load applied to the hoisting wire as a horizontal load when at least six electric wires 2 and two overhead wires 31 of multiple lines, multi-wheel wagon, flywheel, and hoisting tool are added. Is needed.

Next, a method of operating the overhead wire according to an embodiment of the present invention when the electric wire 2 is installed on the suspension support 28 of the above embodiment will be described with reference to FIGS. 2 to 8. First, as shown in FIG. 2, a plurality of suspension supports 28 are installed at predetermined intervals in the wire extension section of the electric wire. An electric wire drum 3 for supplying the electric wire 2 and a wire wheel 4 for applying a tension to the electric wire 2 are provided on the outer side of the suspension support 28 on one end side of the wire extending section, and the other end of the wire extending section is suspended. A winch 6 for winding the wire rope 5 for wire drawing is provided outside the support 28. Further, as shown in FIG. 3, the overhead ground wire arm 30 at the top of each suspended support 28 is provided with a three-wheel wheel 41 slightly inside from both ends. This tricycle 41
As shown in FIGS. 4 and 5, three grooved wheels 41a, 41b, 41c arranged horizontally are rotatably supported by a shaft 41d on a frame 41e, and the top of the frame 41e is connected to a wire rope. It is attached to the overhead ground wire arm 30 by, for example. Grooves are formed on the outer peripheral surface of each groove wheel 41a, 41b, 41c, and one wire 2 is formed in each groove.
Is passed on. The number of grooved wheels of the multi-wheel wagon may be set as appropriate according to the number of electric wires to be connected.

Then, after a wire rope for wire extension is arranged by hand in the wire extension section in which a predetermined number of suspension supports 28 are provided, the wire rope for wire extension is used for the wire drawing vehicle 3 and the overhead ground wire. The three-wheel wheel 41 of the arm 30 and the winch 6 are sequentially laid. The three wires 2 are horizontally connected to one end of the wire rope 5 for wire extension through a yoke 8, and the winch 6 and the wire car 4 are simultaneously operated while the wire rope 5 for wire extension is being operated. By winding the tip side around the winch 6, three electric wires 3 are laid simultaneously between the towers 1 in the wire extension section. In this embodiment, as shown in FIG. 2, even when the connecting portion (yoke 8) between the wire rope 5 for extending the wire and the electric wire 2 is close to the tower 1, there is no need to perform line crossing,
Each of the three electric wires 2 is passed through the gold wheel groove of the three-wheel gold wheel 41 to be extended. After the wire has been extended to the three-wheeled gold wheel 41, a tight wire work is performed to transfer the electric wire 2 from the three-wheeled gold wheel 41 to the suspension clamp 26 provided at the tip of each insulating arm 23. .

When transferring the electric wire 2 passed through the three-wheeled gold wheel 41 to each insulating arm 23, the overhead ground wire arm 3 is used.
The flywheel 32 is attached to a position just above or outside the electric wire 2 at the leading end of 0, and the flywheel 33 is also attached to the base end of the overhead ground wire arm 30. Next, the wire rope 35 having the lifting hook 34 attached to the tip is passed through the jump metal wheels 32 and 33, and the base end side is lowered to the ground, for example. Then, after adjusting the sag of the electric wires 2 until the electric wires 2 reach the specified sag, the electric wires 2 on the three-wheel wheel 41 are transferred one by one to the suspension clamp 26 of the insulating arm. At the time of this transfer, , 3 wire car 41 to electric wire 2
After only one is hooked by the electric wire of the hoisting hook 34 and hoisted, the wire rope 35 is sent to the tip side, the electric wire 2 of the hoisting hook 34 is lowered to the vicinity of the tip of the insulating arm 23, and the hoisting hook 34 is accommodated in the hoisting clamp 26.・ After gripping, as shown in Fig. 6, this suspension clamp 2
6 is attached to the yoke 24. As a result, the electric wire 2 is transferred from the three-wheel wheel 41 to the suspension clamp 26. After the work, it is advisable to remove the flying metal 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, middle, and upper stages.

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. 7, 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 around the outside of the electric wire 2, and the central part of the armor rod 47 elastically grips the electric wire 2 via an insert 48 such as chloroprene rubber. It is a structure that does.

When the vibration-resistant 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 2 horizontally. not,
As shown in FIG. 7, it is preferable to use a two-point hanging tool 40 that holds the electric wire 2 at both sides of the armor rod 47. The illustrated two-point hanging tool 40 has a structure in which a gold wheel 40b for holding the electric wire 2 is attached to both sides of a horizontal member 40a, and a wire rope 35 is connected to both ends of the horizontal member 40a.

In the suspension support 28 of the above embodiment,
It can also be applied to the work of attaching the insulating arm 23 to the support body 28a using the overhead ground wire arm 30, and the lifting and attaching work 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, a vertical load.
The weight of 3 itself and the hoisting tool, and the wind load applied to the insulating arm 23 and the hoisting tool at the time of installation work as a horizontal load are added to the above-mentioned load that is usually generated in the overhead ground wire arm.

In the above embodiment, the three wire 2 is connected to the wire-drawing wire rope 5 via the yoke 8 and the tip end side of the wire-drawing wire rope 5 is wound around the winch 6.
Although the wire was extended between the wheel cars, as shown in Fig. 8,
In addition to the three electric wires 2, an overhead ground wire 31 is connected to the end portion of the wire rope 5 for extension via a yoke 8, and a four-wheel wagon (not shown) is attached to the arm 30 for overhead ground wire. You may make it suspend, and you may make it extend the ground wire 31 at the same time as the three electric wires 2 in this four-wheeled vehicle.

[0026]

According to the overhead wire working method for a suspension support of the present invention, a multi-wheel metal wheel car, for example, a three-wheel metal wheel car having a number of groove wheels equal to or more than the number of electric wires to be wired is used for an overhead ground wire. If the wires are provided on the arm, it is not necessary to perform wire crossing for allocating the wires for each insulating arm even if the wires are close to the suspended support, and multiple wires can be connected between the suspended supports at once and continuously. Since it can be connected to a wheel and wheel car, the wires can be efficiently extended to the suspended support.

According to the overhead wire working method for a suspension support of claim 2, a plurality of electric wires, which are wired to a plurality of wheel wheels provided on the overhead ground wire arm, are attached to the overhead ground wire arm. By using the gold wheel, it is possible to easily lift up from the multi-wheel gold wheel and transfer them to the suspension clamps of the insulating arms below, respectively, so that the wire tightening work can be performed safely.

According to the method for operating the overhead wire of the suspended support according to claim 3, the lightning shielding angle θ of the overhead ground wire with respect to the electric wire is around 0 ° or less than 0 °, and the lightning strike prevention effect can be remarkably improved, and the overhead ground wire can be remarkably improved. The height, that is, the height from the horizontal member of the insulating arm to the overhead ground wire can be reduced, and the height of the entire suspended support can be suppressed to that extent.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a suspension support which is a target of an overhead wire work method of the present invention.

FIG. 2 is an explanatory view for explaining that wire drawing is performed in a wire drawing section of the suspended support of FIG.

FIG. 3 is an explanatory view for explaining a work of transferring an electric wire extended to a multiple wheel car installed on the suspension support of FIG. 1 to a suspension clamp of an insulating arm.

4 is a front view of the multi-wheel car of FIG.

5 is a side view of the multi-wheel wheel car of FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing a state in which an electric wire is suspended by a suspension clamp on the tip of the insulating arm in FIG. 1.

FIG. 7 is a front view of an electric wire lifting tool.

FIG. 8 is an explanatory diagram illustrating a state in which a plurality of electric wires and an overhead ground wire are connected to a wire rope for wire extension via a yoke.

FIG. 9 is an explanatory diagram illustrating an overhead line work in a conventional suspended steel tower.

FIG. 10 is a front view of a wire car for wire suspension that is suspended from a steel tower arm for use in the overhead wire work in FIG. 9.

11 is a side view of the wire drawing wheel of FIG. 10. FIG.

FIG. 12 is a front view of a conventional suspension device.

FIG. 13 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 at the time of tight binding.

14A and 14B show the electric wire lifting hook in FIG. 13, where FIG. 14A is a front view and FIG. 14B is a side view.

FIG. 15 is a front view of a suspension support in a conventional compact power transmission line.

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

[Explanation of symbols]

2 electric wires 5 Wire rope for wire extension 8 York 23 Insulated arm 26 Suspension clamp 28 Suspended support 30 overhead ground arm 31 overhead ground line 32 Tobi Gold Wagon 34 Electric wire lifting hook (electric wire lifting tool) 35 wire rope 40 2-point lifting tool (wire lifting tool) 41 3 wheel car (multiple wheel car)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-135314 (JP, A) JP-A-6-178146 (JP, A) JP-A-2-303306 (JP, A) JP-A-1- 144306 (JP, A) Actual Kaihei 5-79817 (JP, U) Japanese Patent Publication Sho 49-49472 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 1/02

Claims (3)

(57) [Claims] 1. A suspension clamp for supporting an electric wire is provided at an end of an insulating arm provided on a suspension support, and a top of the suspension support is provided above the uppermost insulation arm and parallel to the insulation arm. And an overhead ground wire arm whose tip side projects outward from the tip of the insulating arm,
A multiple wheel sheave that can carry multiple electric wires is provided slightly inside the tip of this overhead ground wire arm, and a plurality of wheel sheaves connected to the rear end of the wire rope for wire extension are connected to this multiple wheel sheave via a yoke. An overhead wire work method for a suspended support, characterized in that two electric wires are placed side by side in a horizontal state and the wires are connected at once. 2. A wire jumper is attached to a position near the tip of the overhead ground wire arm, right above or outside the electric wire supported by the tip of the insulating arm, and the wire passed through the wire jumper. the wire lifting tool attached to the tip of the rope, a wire, which is the overhead wire to the plurality goldfish vehicle, Rukoto transferred to a suspension clamp provided at the front end of the insulating arm
Overhead line work methods in the suspension support of claim 1 wherein feature. 3. The method for operating overhead wire in a suspended support according to claim 1 , wherein an overhead ground wire is provided in the vicinity of the end of the overhead ground wire arm after the electric wire is installed at the end of the insulating arm. .