JPH0951612A - Scaffolding for maintenance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scaffolding which can easily be installed from the tower side and which allows a worker to have easy access to the cable and safely and to perform a maintenance job safely in a stable condition. SOLUTION: A suspension support 31 is provided with an insulating arm 32. At the end of the insulating arm 32, a cable 37 is held by a suspension clamp 38. An end 41b of a main body of a scaffolding 41 is installed on the cable 37 through an arm for suspension 42. A basic end 41a of the main body of a scaffolding 41 is installed on the suspension support 31. Above the main body of a scaffolding 41, a supporting bar 43 which connects an upper section of the arm for suspension 42 and the suspension support 31 is installed. The main body of a scaffolding 41 is made stable by being supported by the supporting bar 43. Furthermore, the supporting bar 43 can be used as a handrail and therefore a worker can lean forward toward the cable side easily and safely and then he can perform a maintenance job with a stable scaffolding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maintenance scaffold used for maintenance work on suspended supports of overhead power lines.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 8 and 9, there are known scaffolds for work in a general tension-resistant steel tower. FIG. 8 shows a work for a tension line in a tension tower, and reference numeral 1 is a tension line ladder used at that time. The tie line ladder 1 has a base end 1a fixed to an end of a steel tower arm 3 of a steel tower 2, and a tip 1b locked by a connecting rod 4 to a wire rope 5a of a sevi metal wagon 5. . The sevi's gold wheel 5 includes a tension-resistant insulator string 6 having one end connected to the steel tower arm 3.
While being attached to the front end side of the electric wire 10, the other end is attached to the electric wire 10 via a cam along to reduce the pulling force when the electric wire 10 is tightened.

The binding wire ladder 1 is made of an aluminum alloy in order to reduce the weight, and is formed to have a length similar to that of the tension insulator string 6, and as shown in FIG. A connecting rod 4 having an engaging portion 4a is rotatably attached to 1b so as to be rotatable in the longitudinal direction of the ladder main body, whereby the tight-fitting ladder 1 can be replaced. The rope 5a is locked, and finally the electric wire 10 is locked. In addition, when performing maintenance work on a suspended tower, a worker used the suspension insulator device as a scaffolding and started to the electric wire side.

[0004]

By the way, in recent years, there is a strong demand for a compact power transmission line in which the entire overhead power transmission line is made as small as possible, and a steel tower using an insulating arm is being studied as a means for realizing this. In order to satisfy the required strength, this insulating arm is provided by using only one horizontal member from the steel tower, and as shown in FIG. 10, the structure of the two horizontal members 21 and the diagonal members 22 is used. As shown in 11,12,
It is known to have a structure of three sets of two horizontal members 21 and one diagonal member 22. These horizontal members 21 and diagonal members 22 constituting the insulating arm 20 are made of an insulating material such as FRP. A polymer insulator made of silicon rubber or the like, which has an umbrella shape similar to that of a conventional porcelain insulator, is provided on the outer circumference of the porcelain insulator, and has both the function as an arm and the function as an insulating support member (the same function as the conventional porcelain insulator) It has become a thing.

In the two-piece insulating arm 20 of FIG. 10, the ends of the horizontal member 21 and the diagonal member 22 are connected by a yoke 23, and a suspension clamp 24 is attached to the yoke 23, and an electric wire is attached to the suspension clamp 24. 10 is gripped. In addition, in the three sets of insulating arms 20 shown in FIGS. 11 and 12, two horizontal insulating arms 21 and one oblique insulating arm 2 are provided.
The tip of the wire 2 is connected by a yoke 23, and similarly, a suspension clamp 24 holding the electric wire 10 is attached to the yoke 23. Further, the maintenance work in the suspended steel tower having the structure using these insulating arms 20 needs to be carried out by a worker from the tower body to the vicinity of the electric wire 10 at the tip of the insulating arm, and the worker can safely and easily perform the work at the tip of the insulating arm 20. There is a need for a scaffold that can perform the work.

[0006] As a maintenance scaffold in a suspended steel tower equipped with the above-mentioned insulating arm 20, it is conceivable to apply the tension wire ladder 1 used for the tension wire work in the conventional tension resistant steel tower.
However, assuming that maintenance work is performed using the conventional tension line ladder 1, the hook 4a at the tip of the tension line ladder 1 is locked to the electric wire 10 and the base end is fixed to the tower side. In this state, the tip of the tension line ladder 1 supports at one point, and when performing work with the tip of the insulating arm 20, the tension line ladder 1 sways to the left and right and is very unstable as a scaffold. Particularly, in the case of the three-arm insulating arm 20, since two horizontal members are installed, the work range is widened, and the worker has to work in a state where he / she leans out of the ladder 1 for tension lines. It becomes dangerous work. In addition, the locking portion 4 of the ladder 1 for tension lines
When a is attached to the electric wire 10, since the connecting rod 4 of the locking portion 4a is rotatable, the locking portion 4a cannot be easily locked to the electric wire 10 from the tower side, and the work is eventually performed. It is assumed that the worker uses the insulating arm 20 as a scaffold to install the hook 4a of the tight-fitting ladder 1 on the electric wire 10 at its tip, and as a result, the insulating arm whose surface is formed of synthetic rubber or the like. There is also a problem that the surface of 20 is likely to be damaged and causes serious defects in electric performance after charging.

The present invention has been made in order to solve the above-mentioned conventional problems, and can be easily installed from the tower side, and an operator can easily and safely get out to the electric wire side. Moreover, it is an object of the present invention to provide a scaffold for maintenance, which enables maintenance work in a stable state.

[0008]

A scaffolding for maintenance according to claim 1 for solving the above-mentioned problems is a scaffolding for maintenance in a suspension support in which an electric wire is suspended and supported by a suspension clamp at the tip of an insulating arm, An end portion is attached to the suspension support, and a tip portion is connected to an electric wire in the vicinity of the suspension clamp via a suspending arm. It is characterized in that it is provided with a support rod which is attached to the upper part of the hanging arm and whose base end is attached to the suspension support side.

According to a second aspect of the present invention, in the scaffolding for maintenance, a clamp portion which fits the electric wire is provided at an upper end of the suspension arm, and the tip portion of the support rod is engaged with the clamp portion, and The clamp portion and the electric wire are characterized in that they are fixed to each other by operating the support rod from the suspension support side.

According to a third aspect of the present invention, the scaffold for maintenance, the main body of the scaffold, and the support bar are extendable / contractible in the longitudinal direction.

[0011]

In the above structure, since the tip of the scaffold body is attached to the electric wire through the suspending arm and the scaffold body is supported by the support rod, a stable scaffold is secured. In addition, the support rod can be used as a handrail, and it is possible to safely jump out to the wire side and perform maintenance work without touching the insulating arm. Since the location of the wire connecting the suspension arms is in the vicinity of the suspension clamp, there is little sway of the scaffold body due to sway of the wire.

In the second aspect, the clamp portion at the tip of the suspending arm is fitted to the electric wire, and the clamp portion is operated by the support rod to fix the clamp portion to the electric wire. Thereby, the upper end of the hanging arm is fixed to the electric wire.
In this way, the scaffold body can be installed safely from the suspension support side.

According to the third aspect of the present invention, the scaffold body and the support rod are expanded and contracted in the longitudinal direction to correspond to the protruding length of the insulating arm.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the vicinity of an insulating arm provided with a scaffold 30 for maintenance according to an embodiment of the present invention. The maintenance scaffold 30 is horizontally arranged at a side of the suspension device 32 of the support 31 such as a suspension tower, that is, a position where an operator can smoothly perform maintenance work. The suspension device 32 is provided with an insulating arm 35 having a two-piece structure composed of a horizontal member 33 and a diagonal member 34. A yoke 36 is connected to the tip of the insulating arm 35. A clamp 38 is attached. The scaffold 30 for maintenance of this embodiment is preferably positioned about 1 m below the horizontal member 33 in consideration of workability.

The horizontal member 33 and the diagonal member 34 of the insulating arm 35 are both shafts 33 of insulating material made of FRP or the like.
a, 34a is provided with polymer insulators 33b, 34b, such as a silicon rubber, having the same umbrella shape as a conventional insulator on the outer periphery, and functions as an arm protruding from the support 31 and as an insulating support member. (Same function as conventional porcelain insulator).

The scaffolding 30 for maintenance includes a scaffolding body 41 horizontally arranged below a side portion of a horizontal member 33, a suspending arm 42 for fixing the scaffolding body 41 to an electric wire 37, and an upper part of the scaffolding body 41. It is mainly composed of a support rod 43 horizontally provided on the. In the scaffolding body 41, the base end 41a is fixed to the support 31 such as a suspension tower by lashing or the like, while the tip 41b is locked to the electric wire 37 by the suspending arm 42, so that the support 31 And the electric wire 37 are installed horizontally.

As shown in FIG. 3, the scaffolding main body 41 has two horizontal frames 41c arranged in parallel to the base end portion 41a side and the front end portion 41b side, and the width between the horizontal frames 41c increases toward the front end. An elongated trapezoidal frame is formed by the two vertical frames 41d that are connected so that the dimensions are narrow,
Stepping rods 41e are arranged at predetermined intervals along the longitudinal direction between the vertical frames 41d. On both sides of the horizontal frame 41c on the side of the base end portion 41a, mounting brackets 41 for the support 31 are provided.
f is fixed, and a mounting bracket 41g for the suspending arm 42 is provided at the center of the horizontal frame 41c on the tip end 41b side. The scaffolding body 41 has a length substantially equal to that of the horizontal member 33 of the insulating arm 35, and is made of aluminum alloy or the like for weight reduction.

An upper end 42a of the suspending arm 42 is fixed to a clamp portion 44 fitted to the electric wire 37, and a lower end 42b of the suspending arm 42 is hinged to a mounting bracket 41g at the tip of the scaffolding body 41. The scaffold body 41 is rotatable in the longitudinal direction. The support rod 43 is horizontally arranged in the longitudinal direction at the center of the upper part of the scaffolding main body 41, and the base end portion 43 a is fixed to the support 31 by lashing or the like, and the tip end portion 4
3b is fixed to the back surface of the clamp 44. Therefore, as shown in FIG. 2, this support rod 43 is arranged in parallel with the scaffolding body 41 at the upper center of the scaffolding body 41 in the longitudinal direction. Used as a handrail. The suspending arm 42 and the support rod 43 are preferably made of iron or aluminum pipe or shaped steel or the like in order to ensure rigidity.

As mentioned above, the scaffold 3 for maintenance of this embodiment
In 0, since the tip of the scaffolding body 41 is installed on the electric wire 37 by the suspending arm 42 and is supported between the support 31 and the electric wire 37 by the support rod 43, a stable scaffolding is secured and the scaffolding is secured. It is possible to move while being caught by the support rod 43 on the main body 41, and it is possible to safely carry out the operation toward the electric wire 37 side and the maintenance work. As a result, the worker does not need to use the horizontal member 33 of the insulating arm 32, the diagonal member 34, etc. as a scaffold, and the work can be performed without touching the polymer insulators 33b and 34b.
The surface damage of b and 34b can be prevented. Therefore, it is possible to put a compact transmission line using an insulating arm into practical use.

Next, a second embodiment of the scaffold for maintenance will be described with reference to FIG. Hereinafter, as shown in the above-mentioned embodiment,
Those that are the same or equivalent are given the same symbols,
The description is omitted. This maintenance scaffold 50 engages a tip portion 52a of a support rod 52 with a clamp portion 51 fixed to an upper end 42a of a hanging arm 42 and fitted to an electric wire 37, and supports the support rod 52 as a support. The clamp portion 51 is fixed to the electric wire 37 by rotating from the 31 side.

As shown in FIG. 5, the clamp part 51 has a clamp body 53 which is open at the bottom so that it can be fitted into the electric wire 37 from the top, and is formed in a concave cross-section with an aluminum alloy casting or the like. Piece 53a on the back side of
And a pressing member 54 slidably inserted in the longitudinal direction of the support rod 52. Further, the pressing member 54 is formed with a female screw portion 54a along the longitudinal direction, and the female screw portion 54a has a female screw portion 54a. A male screw portion 52c formed at the tip 52b of the support rod 52 is screwed into the support rod 52. By rotating the support rod 52 from the base end portion 52a side, the pressing member 54 is fitted to the clamp main body 53 and the electric wire 37 is inserted. Side, push member 5
The electric wire 37 is fixed to the electric wire 37 by pressing the electric wire 37 against the inner surface of the clamp main body 53 by the recess 54b formed at the tip of the electric wire 37. Other configurations and operational effects are similar to those of the above embodiment. Therefore, this second
In the embodiment, since the worker can install the scaffold 50 for maintenance on the electric wire 37 from the side of the support 31 such as a suspended steel tower and rotate the support rod 52 to fix the clamp body 53 to the electric wire 37, the scaffolding can be performed. It is stable, and the work of getting out to the electric wire 37 side can be performed more safely.

Next, the method of installing the scaffold 30 (50) for maintenance will be described. The tip portion 41 of the scaffold body 41 is explained.
While attaching one end of a temporary support rope (not shown) near the mounting bracket 42g of b, the tip of the scaffold main body 30 (50) is supported from the side of the support 31 while maintaining the scaffold 30 for maintenance.
(50) is gradually tilted to the electric wire 37 side, and the clamp portion 51 at the upper end of the hanging arm 42 is fitted to the electric wire 37. In addition, in the case of the scaffold 50 for maintenance of the second embodiment, the support rod 52 is further rotated from the base end portion 52a side to push the pressing member 54.
The electric wire 37 is fixed to the inner surface of the clamp body 53 with. After the scaffold main body 41 is installed between the support 31 and the electric wire 37, the base end 41a of the scaffold main body 41 and the base end 52a of the support rod 52 are fixed to the support 31 by lashing or the like. Therefore, since the scaffold 30 (50) for maintenance of this embodiment can be installed between the support 31 side and the electric wire 37, the worker can use the insulating arm 32 as a scaffold. Therefore, the safety of the scaffold installation work can be secured, and the surface damage of the polymer insulators 33b and 34b of the insulating arm 35 can be prevented.

FIG. 6 shows a third embodiment of the scaffold for maintenance according to the present invention. The scaffold for maintenance 60 comprises a scaffold body 61.
The support bar 63 is slidable and lockable in the longitudinal direction, and the length can be adjusted in correspondence with the insulating arms 32 having different lengths. Other configurations and operational effects are the same as those of the embodiment already described.

FIG. 7 shows a modified example of the scaffolding body of the above-mentioned embodiment. This scaffolding body 71 has two lateral frames arranged in parallel to the base end portion 71a side and the tip end portion 71b side. Two parallel vertical frames 71d are provided between 71c to form a rectangular frame body, and step bars 71e are arranged at predetermined intervals along the longitudinal direction between the vertical frames 71d. . Further, mounting brackets 71f for supporting objects 31 such as suspension towers are fixed on both sides of the horizontal frame 71c on the base end side, and mounting brackets 42 for hanging arms 42 are mounted on both ends of the horizontal frame 71c on the tip end side. 71 g are provided. The scaffold body 71 is the horizontal member 3 of the insulating arm 35.
The length is almost the same as that of No. 3, and it is made of aluminum alloy or the like to reduce the weight. Therefore, the maintenance scaffolding of this embodiment is a more stable scaffolding because the tip portions 71b are locked to the electric wires 37 by the two hanging arms 42.

[0025]

According to the present invention, the scaffold body is fixed to the base end portion of the suspension support, while the tip end portion of the scaffold body is fixed to the electric wire by the suspending arm. Since the upper part and the suspended support are connected by the support rod, a stable scaffold is secured. The support rod can also be used as a handrail. Therefore, a worker who performs maintenance work can safely and easily jump out to the electric wire side, and the maintenance work can be performed without touching the insulating arm, and the surface of the insulating arm is not damaged.

Further, according to the second aspect, since the support rod can be operated from the suspension support side to fix the clamp portion to the electric wire, the scaffold can be easily and surely installed on the electric wire from the suspension support side. At the same time, the clamp part does not come off the electric wire when carrying out the work or maintenance work, and the work safety can be secured.

[Brief description of drawings]

FIG. 1 is a side view of the vicinity of an insulating arm provided with a scaffold for maintenance according to an embodiment of the present invention.

2 is a plan view of the maintenance scaffold in FIG. 1. FIG.

FIG. 3 is a plan view of the scaffolding main body in FIG.

FIG. 4 is a side view of a maintenance scaffold according to a second embodiment of the present invention.

5 is an enlarged side sectional view of the vicinity of the clamp portion of FIG.

FIG. 6 is a side view of a scaffold for maintenance according to a third embodiment.

FIG. 7 is a plan view of a modified example of the scaffold body.

FIG. 8 is an explanatory diagram of a wire tension work using a conventional wire tension ladder.

FIG. 9 is an enlarged perspective view of a conventional tension wire ladder.

FIG. 10 is a side view of a pair of insulating arms for explaining the conventional technique.

FIG. 11 is a side view of three sets of insulating arms for explaining the conventional technique.

12 is a plan view of the three insulating arms of FIG. 11. FIG.

[Explanation of symbols]

 30, 50, 60 Maintenance scaffold 31 Support (suspension support) 35 Insulation arm 37 Electric wire 38 Suspension clamp 41, 61, 71 Scaffold main body 42 Suspension arm 43, 52, 63 Support rod 44, 51 Clamp part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Yokoyama 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Toshiaki Kumeda 1-1-5 Kiba, Koto-ku, Tokyo Shareholders Inside Fujikura

Claims (3)

[Claims] 1. A maintenance scaffold in a suspension support, wherein an electric wire is suspended and supported by a suspension clamp at the tip of an insulating arm, the proximal end of which is attached to the suspension support while the tip of the suspension clamp is attached. A scaffold body that is connected to a nearby electric wire via a suspension arm, a scaffold body that is horizontally provided above the scaffold body, has its tip attached to the upper part of the suspension arm, and has a base end portion on the side of the suspended support. A scaffold for maintenance, characterized in that it has a support rod attached to the. 2. A clamp part for fitting the electric wire is provided on an upper end of the suspension arm, and a tip part of the support rod is engaged with the clamp part, and the clamp part and the electric wire are The scaffolding for maintenance according to claim 1, wherein the support rods are fixed to each other by operating the support rods from the suspension support side. 3. The scaffold for maintenance according to claim 1 or 2, wherein the scaffold body and the support rod are capable of expanding and contracting in the longitudinal direction.