JP3382715B2 - Overhead scaffolding and its installation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catenary scaffolding for a suspension support of an overhead power transmission line, and is suitable for a wire extension or a tight-tie work on a suspension support provided with an insulating arm. And the installation method.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 12 to 17 , there are known scaffolds for overhead lines in general steel towers. FIG. 12 shows the tight-tie work in the tension tower, and reference numeral 1 is a tight-tie ladder used at that time. The tie line ladder 1 has a base end portion 1a fixed to an end portion of a steel tower arm 3 of a steel tower 2, and a tip end portion 1b locked by a connecting rod 4 to a wire rope 5a of a sevi metal wagon 5. .
The sash wheel 5 has one end attached to the tip end side of a tension insulator string 6 connected to the steel tower arm 3, while the other end is attached to the electric wire 10 via a cam-along so that when the electric wire 10 is tightened. Reduce traction.

The tension wire ladder 1 is made of an aluminum alloy in order to reduce the weight, and is formed to have the same length as that of the tension insulator 6 and, as shown in FIG. 13 , the tip portion 1b. A connecting rod 4 having an engaging portion 4a is rotatably attached to the ladder main body in the longitudinal direction of the ladder main body so that the tight binding ladder 1 can be replaced. 5a and finally to the electric wire 10.

FIG. 14 shows the work of drawing and tightening wires in a suspended steel tower. On the steel tower arm 12 of the suspended steel tower 11, in order to facilitate the slack observation of the electric wire, a gold wheel 15 is suspended by a gold wheel cord 14 having the same length as the suspension insulator device installed on the steel tower arm 12. Then, the electric wire 10 passes through the grooved groove of the gold wheel 15 to perform the wire drawing work. In the subsequent wire drawing work, the sag is adjusted to the specified sag after the wire drawing, the suspension insulator device is suspended from the steel tower arm 12 near the gold wire cord 14, and the hoisting hook (not shown) or the like is wound from the steel tower arm 12. This is done by lowering the tool, taking in the electric wire 10 from the gold wheel 15 to the hanging hook, and then accommodating and grasping the electric wire in a suspension clamp (not shown). Then, for the series of tight line work, the worker pays the wagon cord 14
A suspension insulator device or the like is used instead of the scaffold to accommodate and hold the electric wire 10 in the suspension clamp.

[0005]

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. 15 , the structure of the two horizontal members 21 and the diagonal members 22 is used . As shown in 16 , 17 , 2
It is known to have a structure of a set of three horizontal members 21 and one diagonal member 22. These horizontal members 21 and diagonal members 22 constituting the insulating arm 20 are the shafts of the insulating material such as FRP. A polymeric insulator such as silicon rubber, which has an umbrella shape similar to that of conventional porcelain insulators, is provided on the outer circumference, and functions as an arm and as an insulating support member (the same function as conventional porcelain insulators).
It is one that doubles as.

In the two-piece set of insulating arms 20 shown in FIG. 15, the ends of the horizontal member 21 and the diagonal member 22 are connected by a focusing metal fitting 23, and a drawing wheel 24 is suspended from the focusing metal fitting 23. The wire is extended by the electric wire 10 passing through the groove of the gold wheel 24. After storage and grip the wire 10 to the suspension clamp in an insulating arm 20 tip, focused
Tightening work is performed by connecting to the metal fitting 23. In addition, FIG. 1
In the three-piece insulating arm 20 of Nos. 6 and 17 , the tips of the two horizontal insulating arms 21 and the one oblique insulating arm 22 are converged.
It has a structure that is connected by a metal fitting 23. Further, it is necessary to perform the wire drawing and tight-tie work in the suspended steel tower having the structure using the insulating arm 20 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. Scaffolding is needed.

[0007] As a scaffolding for overhead lines used for wire extension and tight wire work in a suspended steel tower equipped with the above-mentioned insulating arm 20, a ladder 1 for tight wire used in a conventional tight wire work in a tension-resistant steel tower.
Can be applied. However, assuming that the tight wire ladder 1 is attached to the insulating arm 20, the hook 4a of the connecting rod 4 of the tight wire ladder 1 is attached to the tip of the insulating arm 20.
Although it will be locked to the focusing metal fittings 23, the tip of the tension line ladder 1 supports one point, and the tension line ladder 1 sways left and right and is unstable as a scaffold. Further, the worker needs to move while sandwiching the insulating arm 20 in the longitudinal direction of the electric wire 10 at the tip of the insulating arm 20, and the conventional tight-fitting ladder 1 does not have a sufficient width dimension. In particular, in the three-arm insulating arm 20, since two horizontal members are installed, the work range is widened, and the conventional binding wire ladder 1 has an insufficient scaffolding area. Further, since the surface of the insulating arm 20 is formed of synthetic rubber or the like, surface damage is likely to occur, which causes a serious defect in electric performance after charging.

The present invention has been made to solve the above-mentioned conventional problems, and is a scaffolding for overhead line which can safely and easily perform wire drawing work and tight wire work in a compact electric line, and a method of installing the same. The purpose is to provide.

[0009]

SUMMARY OF THE INVENTION According to the present invention for solving the above-mentioned problems, a base end of a scaffold body is attached to a suspension support provided with an insulating arm, while both side portions of the tip end of the scaffold body in the scaffold width direction. And a focusing metal connected to the tip of the insulating arm
Overhead line of ingredients and are connected via respective arm hanging down
A scaffold for use , the upper ends of the two hanging arms,
The upper part of each of the locking parts formed on both sides of the focusing metal fitting
Provided a clamp portion of the recessed section to Luo fitting, the distal end portion of the horizontal two support bars having a base end portion is attached to the suspension support material side
And the inner surface of the clamp portion having a concave cross section,
The feature is that the locking part is clamped and fixed .

The invention according to claim 2 is characterized in that the upper end of the suspending arm is attached to the focusing metal fitting , while the lower end is attached closer to the central portion than the tip of the scaffold body. .

The invention according to claim 3 is characterized in that the support rod and the scaffold body are extendable / contractible in the longitudinal direction.

The invention according to claim 4 is characterized in that the suspending arm comprises a connecting member whose height position is adjustable.

A fifth aspect of the present invention is the installation method for installing the scaffold for overhead contact lines according to the first aspect, wherein the scaffold body is supported by a temporary support rope attached to the tip of the scaffold body, and the scaffold body is insulated. While gradually tilting it toward the tip of the arm , attach it to the scaffold body in advance at the locking part of the focusing metal fitting.
After fitting and locking the clamp part on the upper end of the hanging arm, the support bar is operated from the suspension support side to fix the clamp part to the locking part.

[0014]

In the above structure, the scaffold body is fixed to the base end of the suspension support, while the tip of the scaffold body is fixed to the focusing metal fitting of the insulating arm by the two hanging arms.
Since these two suspending arms and the scaffold body form a truss structure, a stable scaffold is secured. Therefore, the work is performed safely and easily, and the insulating arm is less likely to be damaged during the work. And the collection
By fitting the clamp portion at the tip of the hanging arm to the engaging portions formed on both sides of the bundling fitting , and then operating this clamping portion with the support rod , the clamping portion and the engaging portion are mutually separated. can be fixed, thereby, the upper end of the hanging-up arm can be fixed to the focusing bracket. In this way, the scaffold body can be installed safely from the suspension support. Also, the support rod can be used as a handrail,
You can work without touching the insulating arm.

In the scaffold according to the second aspect , since the suspending arm is provided closer to the central portion than the tip of the scaffold body, the gold wheel and the electric wire can be avoided.

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

According to the fourth aspect of the present invention, by adjusting the length of the connecting member, the height position of the suspending arm can be adjusted, and the levelness of the scaffolding can be adjusted.

[0018]

Embodiments of the present invention will now be described with reference to the drawings.
explain. FIG. 1 is a scaffold for overhead lines according to an embodiment of the present invention.59To
Side view near the provided insulating arm, FIG. 2 is in FIG.
An enlarged cross-sectional view of the vicinity of a clamp portion 63, which will be described later, and FIG.
Front view of overhead line scaffolding 59Is. Scaffolding for this overhead line59
Immediately below the suspension device 32 for the support 31 such as a suspension tower.
Horizontally at a position where workers can smoothly perform wire drawing and tension work
It is arranged. This suspension device 32 is diagonal to the horizontal member 33.
Equipped with an insulating arm 35 having a two-piece structure composed of the material 34
Well, at the tip of this insulating arm 35Focusing bracketConnect 36
ing. Hold the wireSuspensionClamp (not shown)
Box'sFocusing bracketDirectly connected to 36. During overhead line work
Is the aboveFocusing bracketThe gold wheel 38 that extends the electric wire 37 to 36
Be hung. Therefore, the overhead line scaffolding of this embodiment59
Is positioned about 1 m below the horizontal member 33 and
The end isFocusing bracketLength slightly outside of 36
And a width dimension larger than the width of the insulating arm 35.
It is preferable.

The horizontal member 33 and the diagonal member 34 of the insulating arm 35 are both shafts 33 made of an insulating material such as FRP.
a, 34a has a structure in which polymer insulators 33b, 34b, such as a silicon rubber having an umbrella shape similar to that of a conventional insulator, are provided on the outer periphery of a, 34a, and functions as an arm protruding from the support 31 and as an insulating support member. (Same function as conventional porcelain insulator). The focusing metal fitting 36 is composed of an end face plate 39 fixed to the end of the horizontal member 33 of the insulating arm 35, and a vertical plate 40 fixed at a right angle to the end face plate 39 and to which the end of the diagonal member 34 is fixed. Has become.

The scaffolding 59 for the overhead wire is provided with the horizontal member 3
3, a scaffolding body 60 horizontally arranged below, and a suspending arm 66 for fixing the scaffolding body 60 to the focusing metal fitting 36.
The scaffold body 60 is fixed mainly by fixing the base end 60a to the support 31 and the like, while the scaffold main body 60 is fixed at the front end.
Both sides in the scaffold width direction (left and right direction in FIG. 3 ) near 60b
The focusing metal fittings 36 are respectively connected by hanging arms 66 .

The upper end of the suspending arm 66 is bundled with
The structure for fixing to the tool 36 will be described.
Protrusions (locking portions) 3 formed on both sides of the end plate 39 of 6
9a, the Ru fitted the clamping portion 63 fixed to the upper end 66a of the scaffold body 60 to the lower portion 66b was fixed was suspended up arm 66. In addition, two supports are provided above the scaffold body 60.
A holding rod 61 is provided. This support rod 61 has a base end portion 61a
The tip 61b is fixed to the support 31 while the tip 61b is
Is connected to the pump part 63. Then, focusing fitting 3 an upper end 66a of the support rod 61 by operating suspended up arms 66
It is fixed at 6. The clamp portion 63, FIG. 2
As shown in FIG. 2, a clamp main body 64 is formed on the lower side so that the projection 39a of the focusing metal fitting 36 can be fitted from the upper side, and has a concave cross section made of aluminum alloy casting or the like. And a pressing member 65 that is slidably inserted in the longitudinal direction. Further, the pressing member 65 has a female screw portion 65a formed in the longitudinal direction.
A male screw portion 61c formed at the tip of the support rod 61 is screwed into the female screw portion 65a, and the support rod 61 is attached to the base end portion 61.
By rotating from the a side, the pressing member 65 with which the male screw portion 61c is screwed is moved in the longitudinal direction of the clamp body 64, and the concave portion 65b formed at the tip of the pressing member 65 and the other inner side of the clamp 64 are moved. sandwiching the protruding portion 39a, which focuses the upper portion 66a of the hanging-up arm 66 by fitting 3
It is fixed to 6.

The scaffolding body 60 of this embodiment is shown in FIG.FourShown in
SoIn the longShaped frame 60eAnd this frame 60eThe long
Connecting bars 6 arranged in parallel at regular intervals along the hand direction
0fAnd consists of this frame 60eThe tip of the figure5Shown in
Install the scaffold body 60 from the support 31 side as
The metal fitting 60c for fixing the temporary support rope 67 is fixed.
And the frame 60eNear the tip of the
The mounting bracket 60d to which the lower end of the frame 66 is fixed is fixed.
ing. The lower end portion 66b of the hanging arm 66 is
It is fixed to the scaffolding body 60 via a mounting bracket 60d.
It The support rod 61 andHangingThe bending arm 66 has a high rigidity.
In order to keep it, use iron or aluminum pipes or shaped steel.
Made, the scaffolding body 60 is made of aluminum alloy to reduce weight
Therefore, it is preferable to manufacture. Scaffolding for overhead wire above59
Then, the worker can scaffold or support the horizontal members 33 and the diagonal members 34.
Safe and easy wire drawing and tying without using as points
Work can be done and insulated arm35High minutes of
Work can be done without touching the insulator, and the polymer
The surface damage of the insulator can be prevented. Therefore,
Practical application of compact transmission line using insulating arm is possible
Becomes Also, scaffolding for this overhead line59The scaffolding body60
And this scaffolding body60Two attached to both sides ofHanging
underArm66Since it forms a truss structure with
A stable foothold is secured even in.The scaffolding body
Like the scaffolding body 41 shown in FIG.Figure to reduce weight
Plate material 41c made of aluminum alloy or the like for
2 are arranged in parallel, and the leading end 41b is connected to the connecting plate 41d.
Two-part structure fixed viaMay be 41b is a foot
It is the tip of the field body 41.

Next, the method of installing the above-mentioned overhead wire scaffold 59 will be explained. The metal fitting 60 at the tip of the scaffold main body 60.
While supporting the scaffolding main body 60 with the temporary support rope 67 attached to c, the scaffolding main body 60 is gradually tilted toward the tip side of the insulating arm 35 and is hung on the projection 39a of the end face plate 39 of the focusing metal fitting 36. After fitting the clamp portion 63 at the upper end of the lowering arm 66, the support rod 6 is inserted from the support 31 side.
1 is rotated to move the pressing member 65 of the clamp portion 63 to the other side of the clamp body 64, thereby fixing the protrusion 39a between the concave portion 65b of the pressing member 65 and the other piece of the clamp 64, and By fixing the base end 61a of the support rod 61 and the base end 60a side of the scaffold body 60 to the support 31, the installation of the overhead wire scaffold 59 is completed. Therefore, in the overhead line scaffold 59 of this embodiment, the scaffold can be installed from the support 31 side without the worker climbing on the insulating arm 35 or the like, and thus the work can be performed safely.

FIG. 6 shows another embodiment of the scaffold for overhead lines according to the present invention . The scaffold 70 for overhead lines is the scaffold body 6
0 and the support rod 61 are slidable in the longitudinal direction and can be locked. Thereby, the length can be adjusted corresponding to the insulating arms 35 having different lengths. The other configurations / effects are the same. FIG. 7 shows still another embodiment of the overhead line scaffold of the present invention . This overhead line scaffold 80 connects the suspension arm 66 with a turnbuckle 81 which is a connecting member, and the turnbuckle 8
The length of the suspending arm 66 can be adjusted by rotating 1. As a result, the scaffolding body 6
The levelness of 0 can be adjusted. The other configurations / effects are the same.

Further, FIGS. 8 , 9 and 10 show a collection of the present invention.
8 shows a modified example of the engaging portion 39a of the end face plate 39 of the bundling fitting 36. The engaging portion 39a shown in FIG. 8 has protrusions 39a formed on both sides of the end face plate 39 integrally with the end face plate 39. Then
Further, a return portion 39b is formed at the tip of the protrusion 39a,
The clamp portion 63 of the support rod 61 is prevented from coming off. In the locking portion shown in FIG. 9 , a mounting hole is formed in the disk-shaped end face plate 39, the protruding portion 39a is a separate member, and the protruding portion 39a is provided with a return portion 39b and a mounting hole 39c. The end face plate 39 is fixed to both sides by bolts or the like. The locking portion 39a shown in FIG. 10 has locking holes 39d into which the tips of the clamp portions 63 of the suspending arms 66 can be inserted near both sides of the end face plate 39, and the clamp portions 39a are clamped in the locking holes 39a. The tip of 63 is inserted, and the locking portion 39, which is the lower edge of the locking hole 39d.
It is adapted to be fitted in a.

In each of the above-mentioned embodiments, the case of the suspended support beyond the two sets of insulating arms has been described.
It can also be applied to the three-piece insulating arm shown in FIGS. When the scaffolding body is used for three sets of insulating arms, the width dimension of the scaffolding body is widened, and therefore, the weight may be reduced by narrowing the scaffolding body toward the tip.

[0027]

According to the present invention, the scaffolding body is fixed to the base end of the suspension support, while the tip end of the scaffolding body is fixed to the focusing metal fitting of the insulating arm by two suspending arms. Since these two suspending arms and the main body of the scaffold form a truss structure, a stable scaffold can be secured, work can be performed safely and easily, and the insulating arm can be damaged during the work. Can be reduced. And
Focus the clamps provided on the upper ends of the two hanging arms.
Fit the locking parts on both sides of the metal fitting to the side of the suspended support.
The tips of two horizontal support bars to which the base ends are attached
For fixing the clamp part to the locking part of the focusing metal fitting
Therefore , the scaffold body can be installed safely from the suspended support. Further, the support rod can be used as a handrail, and work can be performed without touching the insulating arm.

[Brief description of drawings]

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

2 is a side sectional view of the clamp portion <br/> the tip of the support rod of the overhead line for scaffolding of Figure 1.

FIG. 3 is a front view of the overhead scaffolding of FIG. 1 .

4 is a plan view of a scaffold body in FIG.

FIG. 5 is a side view showing an installed state of the overhead scaffolding of the embodiment.

FIG. 6 is a side view showing a scaffold for overhead lines according to another embodiment, showing a state of the scaffold for overhead lines in which the scaffold body and the support rod are slidable.

FIG. 7 is a side view showing a scaffold for overhead lines according to another embodiment, in a state in which a suspending arm is provided with a connecting member for height position adjustment.

FIG. 8 is a front view of a modification of the horizontal plate of the focusing fitting for the scaffolding for overhead lines in FIG. 1 .

9 is a front view of a modified example of the horizontal plate of the focusing fitting for the overhead line scaffolding of FIG. 1. FIG.

FIG. 10 is a front view of a modified example of the horizontal plate of the focusing fitting for the overhead scaffolding of FIG. 1 .

FIG. 11 shows another embodiment of the scaffold body, and is a plan view of the scaffold body.

FIG. 12 is an explanatory view of a wire tension work using a conventional wire tension ladder.

FIG. 13 is an enlarged perspective view of a conventional tension wire ladder.

FIG. 14 is an explanatory view of a situation of a tight line work of a conventional suspension support.

FIG. 15 is a side view of a pair of insulating arms for explaining a conventional technique.

FIG. 16 is a side view of three sets of insulating arms for explaining the conventional technique.

17 is a plan view of the three insulating arms of FIG. 16. FIG.

[Description of symbols] 59 Overhead wire scaffold 31 Support (suspension support) 32 Suspension device 33 Horizontal member 34 Oblique member 35 Insulating arm 36 Focusing metal fitting 37 Electric wire 38 Gold wheel 39 End face plate 39a Projection part, locking hole (locking) 40) Vertical plate 60 Scaffold main body 60a Base end 60b (of the scaffold main body) Tip part 66 (of the scaffold main body) Hanging arm 61 Support rod 61a Base end 61b (of the support rod) Tip part (of the support rod) 63 clamp part 67 temporary support rope 81 turnbuckle (connecting member)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Laid-Open No. 7-303312 (JP, A) Actual Opening 5-79817 (JP, U) Actual Opening 62-63400 (JP, U) Actual Opening 62- 63399 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02G 1/02 B60M 1/28 E04G 3/10

Claims (5)

(57) [Claims] A base end of a scaffolding body is attached to a suspension support provided with an insulating arm, and the base end of the scaffolding body is connected to both sides of the scaffolding body in the scaffold width direction and the tip of the insulating arm. respectively focusing fitting connection is via the arm suspended up was
A scaffolding for suspended overhead lines , wherein the focusing arms are respectively attached to the upper ends of the two hanging arms.
Sectional recess that fits over the locking parts formed on both sides of the metal fitting from above
-Shaped clamp portion is provided, and the tip end portions of two horizontal support rods whose base ends are attached to the suspension support side and the above-mentioned concave cross-section are provided.
A scaffold for overhead lines, characterized in that the locking part of the focusing metal fitting is clamped and fixed to the inner surface of the clamp part . 2. The upper end of the suspending arm is the focusing unit.
The scaffolding for overhead line according to claim 1, wherein the scaffolding is attached to the metal fitting , and the lower end portion is attached to the central portion closer to the tip end of the scaffold body. 3. A contact wire scaffold according to claim 1, wherein the support Bo及beauty scaffold body is capable stretchable in the longitudinal direction. 4. The overhead wire scaffold of claim 1, wherein said hanging arm is provided with a height-adjustable connection member. 5. The installation method for installing a scaffold for overhead lines according to claim 1 , wherein the scaffold body is gradually moved toward the tip side of the insulating arm while being supported by a temporary support rope attached to the tip of the scaffold body. in conjunction will defeat, the locking portion of the focused fitting, on the hanging arm attached in advance scaffold body
A method for installing a scaffold for overhead lines, characterized in that after the end clamps are fitted and locked, the support bar is operated from the suspension support side to fix the clamps to the locks.