JP2000102152A - Vernier metal fitting and method of adjusting slackness of aerial transmission line using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize a vernier metal fitting which can reduce the cost and can raise the work efficiency and a method of adjusting the slackness of an aerial transmission line using it. SOLUTION: A vernier metal fitting 1 is interposed between a tension clamp holding an aerial transmission line and an insulator attached to the support of a steel tower or the like. The vernier metal fitting 1 is constituted so that the length can be adjusted by interposing an inner plate 4 between a pair of plates 2 and 3, thereby enabling the mutual positions to be adjusted in longitudinal direction, and that the outer plates 2 and 3 and the inner plate 4 can be coupled with each other in the specified adjustment position, and further the outer plates 2 and 3 have engagement projections 2a and 3a and the inner plate 4 has engagement holes 8a-8c as the engagement parts for engaging an adjustment tool. The coupling condition between the outer plates 2 and 3 and the inner plate 4 is released by engaging the adjustment tool with the vernier metal fitting 1, and the positional adjustment is performed together with the adjustment tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vernier fitting used in a tension insulator for adjusting the sag of an overhead transmission line and a method of adjusting the sag of the overhead transmission line using the vernier fitting.

[0002]

2. Description of the Related Art FIG. 8 is a top view showing a part of a 4-conductor tension insulator. The vernier fitting 40 includes a pair of outer plates 41, 41, and the outer plates 41, 41.
And an inner plate 42 interposed therebetween. The outer plates 41, 41 have a plurality of bolt insertion holes 43 formed at their leading ends at a predetermined pitch (see FIG. 9), and are spaced at predetermined intervals so that the bolt insertion holes 43 coincide with each other. And a base end thereof is attached to a right-angle clevis link 45 by an attachment bolt 44.

On the other hand, the inner plate 4 has a plurality of positioning holes 46 formed at a predetermined pitch on the tip side thereof (see FIG. 10).
3 is interposed between the outer plates 41, 41, and the base end thereof is attached to the right-angle clevis link 48 by attaching bolts 47. The pitch of the positioning holes 46 is selected to be different from the pitch of the bolt insertion holes 43.

The vernier fitting 40 having such a structure can adjust the positions of the outer plates 41, 41 and the inner plate 42 with respect to each other in the longitudinal direction, and can connect the outer plates 41, 41 to the desired bolt insertion holes 43 and the positioning holes 46. By penetrating the bolt 49, the outer plates 41, 41 and the inner plate 42 are connected, and the vernier fitting 40 having a desired length can be obtained. Here, since the bolt insertion holes 43 and the positioning holes 46 are formed at different pitches as described above, the bolt insertion holes 43 and the positioning holes 46 are not formed.
By changing the combination with
The length of 0 can be changed stepwise.

The vernier fitting 40 is used as a component of a tension insulator for holding an overhead power transmission line on a support such as a steel tower, and is attached to a support and a tension clamp 50 for holding the overhead power transmission line. The overhead transmission line is interposed between a pair of legs (not shown) and is used to adjust the length of the overhead transmission line (the degree of slackness) by adjusting the length.

The vernier fitting 40 includes an outer plate 41,
The base end of 41 is connected to both ends of the double yoke 51 by right-angle clevis links 45, respectively, and the base end of the inner plate 42 is tension clamped by right-angle clevis links 48, parallel clevis 52, and special clevis link 53. 50 are connected to the base end. Tension clamp 50
Is gripping a power transmission line (not shown) on the tip side.
In the same manner as described above, the vernier metal fittings 40 and 42 are provided at both ends of another double yoke 54 disposed below the double yoke 51.
The tension clamps 50 and the like are connected respectively. Therefore, the tension insulator shown in FIG. 8 holds four transmission lines.

The double yokes 51 and 54 are connected to the upper end and the lower end of a double yoke 55 extending in the vertical direction, respectively. The double yokes 55 are connected to the insulator (not shown) by connecting fittings.

FIGS. 9 and 10 are side views for explaining a method of adjusting the length of the vernier fitting 40. FIG. Adjustment of the length of the vernier fitting 40 is performed by mounting the adjustment tool 60. The adjusting tool 60 is provided with support members 62, 63 at both ends of the support rod 61.
Are pivotally mounted, and the pair of support members 62, 63
The base end side of the double-acting cylinder 64 and the tip end side of the piston rod 65 are swingably attached to each one end, and engaging portions 66 and 67 are formed at the other end. ing. The adjusting tool 60 connects the engaging portions 66 and 67 from above the vernier fitting 40 to the right-angle clevis link 4 respectively.
Attachment is achieved by swingably attaching to the attachment portions 48a, 45a of the 8, 45.

When the piston rod 65 is advanced after the mounting, the support members 62, 63 swing about the ends of the support rod 61 in the direction in which the engaging portions 66, 67 approach each other, thereby taking in the transmission line. At the same time, the tension acting on the vernier fitting 40 acts on the adjusting tool 60, and the vernier fitting 40 hangs down (see FIG. 10). In this state, the connection bolt 49 is removed, and the bolt insertion hole 43 and the positioning hole 4 are adjusted to a desired length.
6 is selected to perform alignment, and connection bolts 49 are inserted into the selected bolt insertion holes 43 and positioning holes 46 to connect the outer plates 41, 41 and the inner plate 42.

Then, after the piston rod 65 is retracted so that tension acts on the vernier fitting 40, the adjusting tool 60 is removed, and the operation is completed.

[0011]

The adjustment tool 60 is
Since the number of parts is large, large and heavy, there is a problem that it is difficult to handle, and it is particularly difficult to work at a high place. Also, in the case of a four-conductor tension insulator device as shown in FIG. 8, when it is mounted on the lower vernier bracket 40, it is necessary to mount it from the horizontal direction so that contact with the upper component does not occur. However, at this time, one operator is required to hold the adjustment tool 60, and therefore, there is a problem that the adjustment work is performed by at least two workers, and the operation cost is increased.

In order to use the adjusting tool 60, special connecting metal fittings necessary for mounting the adjusting tool 60 at both ends of the vernier metal fitting 40, that is, right-angle clevis links 45 having mounting portions 45a and 48a are formed. 48 are required, and the cost of the connection fitting increases. Also, the mounting portions 45a, 48a
Is formed, the length of the clevis links 45 and 48 is increased, and the tension clamp 50 is erected at a position away from the support. For this reason, the length of the jumper wire connecting between the transmission line erected by another tension insulator attached to the support and the transmission line erected becomes longer, resulting in an increase in cost.

Further, when adjusting the sag, it is necessary to take a long power transmission line and release the tension to the vernier fitting 40 in anticipation of the sagging of the vernier fitting 40, so that the workability is poor. There is also a problem. That is, even when the vernier bracket 40 is extended, the procedure of taking in the transmission line, adjusting the vernier bracket 40, releasing the transmission line, and applying the tension again must be taken. Even in the case of reducing the length of 40, once the transmission line is taken in more than the length to be reduced, the vernier bracket 4
It is necessary to take a procedure of adjusting 0, releasing the transmission line and applying tension again, and the adjustment operation requires time and effort.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and has as its object to reduce the cost and improve the workability, and an aerial fitting using the vernier fitting. An object of the present invention is to provide a transmission line sag adjustment method.

[0015]

Accordingly, a vernier fitting according to claim 1 is a vernier fitting which is interposed between a tension clamp 15 holding an overhead power transmission line and an insulator attached to a support such as a steel tower. 1 and 1a, wherein an inner plate 4 is interposed between a pair of outer plates 2 and 3 so that the positions thereof can be adjusted in the longitudinal direction so that the length can be adjusted, and the outer plate 2 can be adjusted at a predetermined adjustment position. , 3 and the inner plate 4 are configured to be mutually connectable, and the outer plates 2, 3 and the inner plate 4 are further provided with adjusting tools 20, 70 used to adjust their lengths in a stretched state. Are characterized in that engaging portions 2a, 3a, 8, and 18 with which a pair of extendable and contractible engaging portions 22, 24, 72, and 71 are respectively engaged are formed.

According to a second aspect of the present invention, there is provided the overhead transmission line sag adjusting method according to the first aspect, wherein the overhead transmission line is gripped between the tension clamp 15 and the insulator attached to a support such as a steel tower. 1 and 1a, the adjusting tools 20 and 70 are engaged with the vernier fittings 1 and 1a, and then the connection state between the outer plates 2 and 3 and the inner plate 4 is released. The position of the outer plates 2 and 3 and the inner plate 4 is adjusted by using the
The length of a is adjusted, the outer plates 2, 3 and the inner plate 4 are connected at the adjusted position, and then the adjusting tools 20, 70 are removed.

Since the adjusting tools 20 and 70 are attached to the vernier fittings 1 and 1a as described above, standard adjusting fittings 45 and 48 connected to both ends of the conventional vernier fitting 40 are replaced with standard fittings. Connecting brackets 11 and 12 can be used, and the cost of parts can be reduced. Also,
Since the standard connection fitting is shorter than the special connection fitting, the tension clamp 15 can be installed closer to the support. As a result, a jumper wire for connecting to a transmission line erected by another tension insulator attached to the support is shortened, and the cost can be reduced.

Furthermore, when adjusting the length of the vernier fittings 1 and 1a, that is, when adjusting the sag of the overhead power transmission line, the adjusting tools 20 and 70 and the vernier fittings 1 and 1a are integrated into the required length. Since the expansion and contraction is performed, the workability is improved without requiring any trouble.

The third aspect of the present invention relates to the outer plates 2 and 3.
Are engaging projections 2a, 3a formed on the side surfaces, and the engaging portion of the inner plate 4 is at least one engaging hole 8.

Various shapes can be considered as the shape of the engaging portion. The engaging protrusions 2a, 3
By forming a, the engaging portion of the adjustment tool 20 can be engaged at a position closer to the inner plate 4,
The adjustment tool 20 can be reduced in size. In the case of an engagement hole, it must be formed at a position not affected by the inner plate 4, that is, at a base end side of the outer plates 2 and 3.
As a result, the distance between the inner plate 4 and the engagement portion becomes longer,
This is because the length of the adjustment tool 20 becomes longer. In addition, since there are three members, a pair of outer plates 2 and 3 and an inner plate 4, between the engagement protrusions 2a and 3a, it is necessary to support the adjustment tool 20 on the upper surfaces of these three members. Therefore, the adjustment tool 20 can be stably supported. On the other hand, the inner plate 4 is used alone for the adjustment tool 2.
Therefore, the adjusting tool 20 can be stably supported by forming the engaging hole 8 and engaging the engaging portion 24 of the adjusting tool 20 with the bolt 32.

Further, in the fourth aspect, the adjusting tool 20 is
A main body 22 having a double-acting cylinder 21 attached thereto, and an engaging portion 24 attached to a distal end side of a piston rod 23 of the double-acting cylinder 21 are provided.
4 with the engaging portions 2 of the outer plates 2 and 3
a, 3a, and the other engages with the engaging portion 8 of the inner plate 4, and the main body 22 and the engaging portion 24 are moved in the longitudinal direction of the vernier fitting 1 by the forward or backward movement of the piston rod 23. It is characterized in that the positions of the outer plates 2 and 3 and the inner plate 4 are adjusted by separating or approaching in parallel.

According to the fourth aspect of the present invention, the number of components constituting the adjusting tool 20 is reduced, so that the size and the weight can be reduced, the handling becomes easy, and the adjusting work at a high place becomes easy. Further, since the adjustment tool 20 can be attached from above the vernier fitting 1, the worker 1
The mounting work and the adjusting work can be performed by only a person, and the working efficiency can be improved. Although the conventional adjusting tool 60 can be used for the vernier fitting 1 of the present invention, the adjusting tool 20 is optimally used because it has the drawbacks described in the section of the problem to be solved by the invention. is there.

Further, in the fifth aspect, the adjusting tool 70 is
Two double-acting cylinders 73a, 7 arranged at positions substantially 180 degrees opposite each other with the vernier fitting 1a interposed therebetween.
3b and a double-acting cylinder 73
a, 73b of the piston rods 74a, 74b of the outer plates 2, 3 with the engaging portions 71 to which the distal ends of the piston rods 74a, 74b are attached. And the other is engaged with the engaging portion 8 of the inner plate 4.
And the main body 72 and the engaging portion 71 are separated or approached in parallel with the longitudinal direction of the vernier fitting 1a by advancing or retreating the piston rods 74a, 74b,
It is characterized in that the positions of the outer plates 2 and 3 and the inner plate 4 are adjusted.

According to the fifth aspect, the two-acting cylinders 73a and 73b, which are arranged at positions substantially 180 degrees opposite each other with the vernier fitting 1a interposed therebetween, receive the tension acting on the vernier fitting 1a. Therefore, since the line of action L3 of the tension and the central axes L1 and L2 of the double-acting cylinders 73a and 73b are not on the same line, the bending moment generated in the cylinder and the piston rod is
They will cancel each other out. Thereby, the piston rods 74a and 74b can be smoothly advanced or retracted, and the work of adjusting the length of the vernier fitting 1a becomes easy. Also, since the force acting on one double-acting cylinder becomes approximately half of the above-mentioned tension by using the two double-acting cylinders 73a and 73b, a small and lightweight double-acting cylinder with low capacity is used. Can be used. Thus, the size and weight of the adjustment tool 70 can be reduced.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the vernier fitting of the present invention and the method for adjusting the sag of an overhead transmission line using the same will be described in detail with reference to the drawings.

FIG. 1 shows the structure of a vernier fitting 1 according to one embodiment of the present invention, wherein FIG.
(B) is a side view. The vernier fitting 1 includes a pair of outer plates 2 and 3 and an inner plate 4 interposed between the outer plates 2 and 3. Outer plates 2, 3
Is an elongated flat plate-shaped component, and a plurality of (seven in this embodiment) bolt insertion holes 5a to 5g (the reference numeral "5" is used when collectively referred to) are used at a predetermined pitch on the tip side. Each is formed. And outer plates 2, 3
The bolts 5 are arranged to face each other at a predetermined interval so that the bolt insertion holes 5 coincide with each other, and the base end thereof is attached to a predetermined connection fitting by a mounting bolt 6.

The distal ends of the outer plates 2, 3 are shown in FIG.
As shown in (b), the width thereof is formed to be tapered, and the cylindrical outer protrusions 2a, 3a
Are formed respectively. Furthermore, the outer plate 2,
On the upper surfaces 2b, 3b of 3, the number from "1" to "7" is attached as information for identifying the position of the bolt insertion hole 5, for example, in the present embodiment. This number is added so as to increase by one from the distal end toward the proximal end.

On the other hand, the inner plate 4 is also an elongated flat plate-like component like the outer plates 2 and 3, has a width almost the same as the outer plates 2 and 3, and has a slightly larger thickness than the outer plates 2 and 3. Is formed. The inner plate 4 has a plurality (nine in the present embodiment) of positioning holes 7a to 7i (a reference numeral "7" when collectively referred to) at the front end thereof.
Are formed at a predetermined pitch. The pitch of the positioning holes 7 is selected to be different from the pitch of the bolt insertion holes 5. And the inner plate 4
Is provided between the outer plates 2 and 3 so that the positioning hole 7 can communicate with the bolt insertion hole 5, and a mounting bracket (not shown) is provided by inserting a mounting bolt into an insertion hole 4 a formed at the base end thereof. Attached to.

Between the insertion hole 4a and the positioning hole 7, a plurality of (three in this embodiment) engagement holes 8a, 8
b and 8c (the reference numeral "8" is used when collectively referred to) are formed at a predetermined pitch. Further, on the upper surface 4b of the inner plate 4, as information for identifying the position of the positioning hole 7, for example, in the present embodiment, alphabets from "A" to "I" are added from the base end to the tip end. Have been.

In the vernier fitting 1 having such a structure, the outer plates 2 and 3 and the inner plate 4 can be adjusted in position relative to each other in the longitudinal direction, and can be connected to desired bolt insertion holes 5 and positioning holes 7. By penetrating the bolt 9, the outer plates 2, 3 and the inner plate 4 are connected, and the vernier fitting 1 having a desired longitudinal length can be obtained. Here, as described above, the bolt insertion hole 5
And the positioning holes 7 are formed at different pitches,
Bolt insertion hole 5 through which connecting bolt 9 penetrates and positioning hole 7
By changing the combination with
Can be changed stepwise.

The vernier fitting 1 is used as a component of a tension insulator for holding an overhead transmission line on a support such as a steel tower, and is attached to a tension clamp and a support for holding the overhead transmission line. The overhead transmission line is used to adjust the sag (the degree of sag) of the overhead transmission line by adjusting its longitudinal length.

FIG. 2 is a top view showing a state where the vernier fitting 1 is attached. Vernier fittings 1 are outer plates 2 and 3
Are connected to both ends of the double yoke 10 by right-angle clevis links 11, respectively. The base end of the inner plate 4 is tension-tightened by a right-angle clevis link 12, a parallel clevis 13, and a special clevis link 14.
5 is connected to the base end. The tension clamp 15 grips a power transmission line (not shown) at its distal end. Also,
Another double yoke 16 arranged below the double yoke 10
Similarly, the vernier fitting 1, the tension clamp 15, and the like are connected to both ends. Therefore, four power transmission lines are gripped, and FIG. 2 is a configuration example of a tension insulator device for four conductors.

The double yokes 10 and 16 are connected to upper and lower ends of a double yoke 17 extending in the vertical direction, respectively. The double yokes 17 are connected to insulators (not shown) by connecting metal fittings. I have. The insulator is attached to a support such as a steel tower.

FIGS. 3A and 3B are side views for explaining a method of adjusting the length of the vernier fitting 1. FIG.
Indicates the case of the standard length, (b) indicates the case of the minimum length, and (c) indicates the case of the maximum length. Adjustment of the length of the vernier fitting 1 is performed by mounting the adjustment tool 20. The adjusting tool 20 includes a main body 22 to which a double-acting cylinder 21 is attached, and an engaging portion 24 attached to a tip of a piston rod 23 of the double-acting cylinder 21, and is attached to the vernier fitting 1 from above. Is done. FIG.
4A is a front view of the main body 22 as viewed from the tension clamp 15 side, and FIG. 4B is a front view of the engagement portion 24 as viewed from the tension clamp 15 side.

The main body 22 has a pair of mounting plates 25, 25 formed on a bottom surface 22a serving as a mounting surface. Mounting plate 25
Has a bolt insertion hole 26 in the vicinity of its distal end, and has an engaging surface 27 that engages with the engaging protrusions 2a, 3a on the end surface on the engaging portion 24 side. And the main body 22 is the bottom surface 2
2a is mounted so as to contact the upper surfaces of the outer plates 2 and 3, and the engagement surfaces 27 of the pair of mounting plates 25 and 25
27 are respectively engaged with the engagement protrusions 2a, 3a. Then, a nut 29 is screwed into a bolt 28 inserted into the bolt insertion holes 26, 26, and the outer plates 2, 3 are attached by a pair of attachment plates 25, 25 so as to be clamped.

The engagement portion 24 is provided on the bottom surface 2 serving as a mounting surface.
4a, a pair of mounting plates 30, 30 are formed. The mounting plate 30 has a bolt insertion hole 31 at the center thereof.
The engaging portion 24 is mounted so that the bottom surface 24a is in contact with the upper surface of the inner plate 4, and the bolt insertion hole 31 is aligned with any of the engaging holes 8a, 8b, 8c. Then, the bolt 32 is inserted through the bolt insertion holes 31, 31 and the engagement hole 8, the nut 33 is screwed, and the pair of mounting plates 30, 30 are mounted on the inner plate 4.

After attaching the adjusting tool 20 to the vernier fitting 1 in this way, the connecting bolt 9 is removed. At this time, if the piston rod 23 is slightly retracted, the tension acting on the connecting bolt 9 can be reduced, and the connecting bolt 9 can be easily removed. When the connecting bolt 9 is removed, tension acts on the outer plates 2 and 3 and the inner plate 4 in opposite directions.
And the inner plate 4 are connected by the adjustment tool 20. Therefore, the outer plates 2 and 3 and the inner plate 4 are held substantially in line on the line of action of tension. In this state, the piston rod 23 is moved forward or backward to adjust the positions of the outer plates 2 and 3 and the inner plate 4, and adjust the length of the vernier fitting 1. Note that the double-acting cylinder 21 is manually operated.

For example, when the vernier fitting 1 has a standard length as shown in FIG. 3 (a), when the length is to be reduced, the engaging portion 24 is engaged with the base plate side of the inner plate 4. Hole 8a
, And the piston rod 23 is retracted, the adjustment can be made between the standard length and the minimum length. When the length is increased, the engagement portion 24 is engaged with the engagement hole 8c on the distal end side of the inner plate 4 and the piston rod 23 is advanced. Can be adjusted. When the length to be adjusted is short, the engaging portion 24 is inserted into the intermediate engaging hole 8b.
, The amount of movement of the piston rod 23 can be reduced and the working time can be shortened.

The length of the vernier fitting 1 is adjusted stepwise because the combination of the bolt insertion holes 5 of the outer plates 2 and 3 and the positioning holes 7 of the inner plate 4 is changed. For example, when the bolt insertion holes 5 of the outer plates 2 and 3 are formed at a pitch of 30 mm and the positioning holes 7 of the inner plate 4 are formed at a pitch of 40 mm, the length of the vernier fitting 1 can be adjusted in units of 10 mm. .

After adjusting the positions of the outer plates 2 and 3 and the inner plate 4 so as to have a desired length in this manner, the connecting bolt 9 is inserted into the bolt insertion hole 5 and the positioning hole 7.
And the outer plates 2, 3 and the inner plate 4 are connected to each other, and the adjusting tool 20 is removed to complete the adjusting operation.

As described above, according to the present embodiment, the number of components constituting the adjusting tool 20 is reduced, so that the adjusting tool 20 is compact and lightweight, handling is easy, and adjusting work at a high place is also easy. . Further, since the adjusting tool 20 can be attached from above the vernier fitting 1, the attaching work and the adjusting work can be performed by only one worker, and the working efficiency can be improved. For example, in the case of four conductors, the conventional adjustment tool 60 needs to be attached to the lower vernier bracket from the horizontal direction in consideration of the height, and thus requires two workers. Since the adjusted tool 20 can be mounted from above without considering the height, only one operator is required, and the operation cost can be reduced.

Further, since the adjusting tool 20 is mounted on the vernier fitting 1, the conventional vernier fitting 4 can be used.
Standard connecting fittings can be used in place of the special connecting fittings 45 and 48 connected to both ends of the “0”, and the parts cost can be reduced. Further, since the standard connection fitting is shorter than the special connection fitting, the tension clamp 15 can be installed closer to the support. This shortens the jumper line connecting between the transmission line erected by another tension insulator attached to the support and
Cost can be reduced.

Further, at the time of adjusting the sag, the adjusting tool 20 and the vernier fitting 1 are integrally extended and contracted by a required length, so that the work is not required and the workability is improved.

In the present embodiment, the engaging projections 2a and 3a are formed on the outer plates 2 and 3 and the engaging holes 8 are formed on the inner plate 4 as engaging portions for engaging the adjusting tool 20. However, conversely, engaging holes may be formed in the outer plates 2 and 3 and engaging protrusions may be formed in the inner plate 4, and further, engaging protrusions may be formed on both the outer plate 2 and the inner plate 4. Or both may be formed with an engagement hole. Also, the main body 22 of the adjustment tool 20
Is engaged with the outer plates 2 and 3 and the engaging portion 24 is engaged with the inner plate 4.
2 may be engaged with the inner plate 4 and the engaging portion 24 may be engaged with the outer plates 2 and 3.

Various shapes can be considered for the shape of the engaging portion, but the engaging projections 2a, 3
By forming a, the main body 22 of the adjustment tool 20 can be engaged at a position closer to the inner plate 4, and the size of the adjustment tool 20 can be reduced. In the case of the engagement hole, it is necessary to form the hole not to be affected by the inner plate 4, that is, at the base end side of the outer plates 2 and 3, so that the distance between the inner plate 4 and the engagement portion becomes longer. This is because the length of the adjustment tool 20 becomes longer. Since there are three members, a pair of outer plates 2 and 3 and an inner plate 4, between the engagement protrusions 2a and 3a, the heavy main body 22 is placed on the upper surface of these three members. Adjustable tool 2 can be supported because it can be supported
0 can be supported. On the other hand, since the inner plate 4 needs to support the adjustment tool 20 alone, the engagement hole 8
Is formed, and the engaging portion 24 of the adjusting tool 20 is engaged with the bolt 32, whereby the adjusting tool 20 can be stably supported.

Accordingly, as in the present embodiment, the main body 22 is engaged with the engagement projections 2a, 3a formed on the outer plates 2, 3, and the engagement portion 2 is engaged with the engagement hole 8 formed on the inner plate 4.
The mode in which the adjustment tool 20 is mounted on the vernier fitting 1 by engaging the bolt 4 with the bolt 32 is optimal.

The outer plates 2 and 3 and the inner plate 4
By forming an engagement hole on each base end side of the conventional adjustment tool 6
0 can also be used. However, in order to eliminate various disadvantages as described above, it is preferable to use the adjustment tool 20 having the above structure.

FIGS. 5 to 7 are diagrams for explaining another embodiment of the present invention. A feature of the present embodiment is that an adjustment tool 70 including two double-acting cylinders 73a and 73b arranged at positions approximately 180 degrees opposite each other with the vernier fitting 1a interposed therebetween is used. still,
This embodiment is similar to the above-described embodiment, and the same components are denoted by the same reference numerals and description thereof will be omitted.

FIG. 5 shows the structure of the adjusting tool 70.
(A) is a top view, (b) is a side view, (c)
FIG. 6 is a front view of the engaging portion 71 as viewed from the tension clamp 15 side, and FIG. 6D is a rear view of the main body 72 as viewed from the insulator side. The adjusting tool 70 has a vernier fitting 1a (see FIG. 6).
The main body 72 to which two double-acting cylinders 73a and 73b are attached at positions substantially 180 degrees opposite to each other, and the tip ends of the piston rods 74a and 74b of the double-acting cylinders 73a and 73b are And a mounting portion 71 attached thereto, and is attached to the vernier fitting 1a from above.

The vernier fitting 1a shown in FIG.
Is substantially the same as the vernier fitting 1 shown in FIG.
3a, the engaging holes 18 and 18 are formed in the base end side.
Is formed.

The engaging portion 71 has a fitting groove 75 at the center thereof and has a substantially U-shaped mounting plate 76 when viewed from the front.
A pair of engagement pieces 77a, 77b protruding toward the fifth side
And The fitting groove 75 is formed to have the same width and depth as the width and height of the inner plate 4 so that the fitting groove 75 can be attached to the inner plate 4.

The engaging pieces 77a, 77b are formed with bolt insertion holes 31, 31, respectively. Then, the engaging portion 7
1 fits and mounts the inner plate 4 in the fitting groove 75, and aligns the bolt insertion holes 31, 31 with any of the engaging holes 8a, 8b, 8c of the inner plate 4. Then, a bolt (not shown) is inserted into the bolt insertion holes 31 and 31 and the engagement hole 8, and a nut is screwed into the pair of engagement pieces 77.
a, 77b are attached to the inner plate 4.

The main body 72 has a fitting groove 78 at the center thereof and has a substantially U-shaped mounting plate 79 as viewed from the front, and is formed so as to protrude toward the insulator along the fitting groove 78. And a pair of engaging pieces 80a and 80b.
The fitting groove 78 is formed to have the same width and depth as the width and height of the outer plates 2 and 3 with the inner plate 4 interposed therebetween so that the fitting grooves 78 can be mounted on the outer plates 2 and 3. Further, the bolt insertion holes 8 are formed in the engagement pieces 77a and 77b.
1, 81 are formed. The main body 72 fits the outer plates 2 and 3 into the fitting grooves 78 and mounts the bolts, and inserts the bolt insertion holes 81 into the engaging holes 1 of the outer plates 2 and 3.
8 and 18. Then, bolts (not shown) are inserted into the bolt insertion holes 81, 81 and the engagement holes 18, 18, and nuts are screwed together, and the pair of engagement pieces 80a, 80b are attached to the outer plates 2, 3.

In the present embodiment, the double-acting cylinders 73a and 73b are, as shown in FIG.
Although it is configured to be disposed at the upper left portion and the lower right portion of the vernier fitting 1a when viewed from the side, however, as long as the position is approximately 180 degrees opposite to and sandwiches the vernier fitting 1a as described above, It may be a position. In addition, if the positional relationship is accurately described, the double-acting cylinders 73a, 73
When the center axis of b is L1 and L2, respectively, and the center axis of the vernier fitting 1a (the line of action of tension) is L3, the center axis L3 exists on the virtual plane P including the center axes L1 and L2. It is desirable that the distance between L3 and the distance between L2 and L3 be substantially equal.

As described above, approximately 1 mm is sandwiched between the vernier bracket 1a.
Two double-acting cylinders 73a, 73
3b, the two double-acting cylinders 73
The tension acting on the vernier fitting 1a is received at the points a and 73b. Accordingly, since the line of action L3 of the tension and the central axes L1, L2 of the double-acting cylinders 73a, 73b do not exist on the same straight line, the cylinders 73a, 73b
And the bending moments generated in the piston rods 74a and 74b cancel each other.

FIGS. 7A and 7B are side views for explaining a method of adjusting the length of the vernier fitting 1a. FIG. 7A shows a case where the vernier fitting 1a has a standard length, and FIG. A certain time is shown, and (c) shows a time when the length is the maximum. The adjustment method is similar to the above-mentioned vernier fitting 1,
The engaging portions 71 are formed by engaging holes 8a, 8b, 8c of the inner plate 4.
And the piston rods 74a, 74
If b is moved forward or backward, it can be adjusted to a desired length.

As described above, according to the present embodiment, the piston rods 74a and 74b can be smoothly advanced or retracted, and the length adjustment work of the vernier fitting 1a becomes easy. Also, two double-acting cylinders 73a, 73b
Is used, a small-sized and lightweight double-acting cylinder with low capacity can be used, and the size and weight of the adjusting tool 70 can be reduced. This facilitates handling of the adjusting tool 70, facilitates work at high places, and improves safety.

In this embodiment, the same effects as those of the above embodiment can be obtained. Vernier fitting 1a
A modification example of an engagement structure between the adjustment tool 70 and the adjustment tool 70 can be similarly applied.

[0059]

As described above, according to the vernier fitting of claim 1 or the method for adjusting the sag of an overhead transmission line of claim 2, the adjusting tool is attached to the vernier fitting, so that a special connecting fitting is used instead. As a result, standard connection fittings can be used, and the cost of parts can be reduced. In addition, by using a standard connection fitting shorter than the special connection fitting, the jumper wire connecting the transmission lines becomes shorter, and the cost can also be reduced in this regard. Furthermore, when adjusting the length of the vernier bracket, that is, when adjusting the sag of the overhead power transmission line, the adjustment tool and the vernier bracket are integrally extended and contracted to the required length, so that no trouble is required. Workability is improved.

According to the third aspect, the adjusting tool can be stably mounted on the vernier fitting.

Further, according to the fourth aspect, the adjustment tool can be made compact and lightweight, and its handling is easy, and the adjustment work at a high place is also easy. In addition, only one worker can perform mounting work and adjustment work,
Work efficiency can be improved.

According to the fifth aspect, the use of the two double-acting cylinders allows the line of action of the tension acting on the vernier bracket and the central axis of the double-acting cylinder not to be on the same line. Since the bending moment generated in the cylinder and the piston rod is canceled, the piston rod can be smoothly advanced or retracted,
The work of adjusting the length of the vernier bracket is facilitated. In addition, since a small-sized and lightweight double-acting cylinder having a low capacity can be used, the adjustment tool can be reduced in size and weight. Thereby, handling of the adjusting tool is facilitated, work at high places is facilitated, and safety is improved.

[Brief description of the drawings]

FIG. 1 shows the configuration of a vernier fitting according to an embodiment of the present invention, wherein (a) is a top view and (b) is a side view.

FIG. 2 is a top view showing an attached state of a vernier fitting.

FIG. 3 is a side view for explaining a length adjusting method of the vernier fitting.

FIG. 4 is a front view showing a mounting state of the adjustment tool;
(A) shows a main body, (b) shows an engaging part.

FIG. 5 is a configuration diagram showing a configuration of an adjustment tool used in another embodiment of the present invention.

FIG. 6 is a configuration diagram showing a configuration of a vernier fitting according to another embodiment.

FIG. 7 is a side view for explaining a length adjusting method of the vernier fitting.

FIG. 8 is a top view showing an attached state of a conventional vernier fitting.

FIG. 9 is a side view showing a conventional vernier fitting length adjusting method.

FIG. 10 is a side view showing a conventional length adjusting method of a vernier fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vernier bracket 1a Vernier bracket 2 Outer plate 2a Engagement projection 3 Outer plate 3a Engagement projection 4 Inner plate 5 Bolt insertion hole 7 Positioning hole 8 Engagement hole 9 Connecting bolt 15 Tension clamp 18 Engagement hole 20 Adjustment tool 21 Multiple Dynamic cylinder 22 Main body 23 Piston rod 24 Engagement part 70 Adjusting tool 71 Engagement part 72 Main body 73a Double acting cylinder 73b Double acting cylinder 74a Piston rod 74b Piston rod

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akihiro Ikeda 13-1 Isojima Minamicho, Hirakata-shi, Osaka F-term in Nippon Katan Co., Ltd. (reference) 5G367 BA01 BB10

Claims (5)

[Claims] A tension clamp (1) holding an overhead power transmission line.
5) A vernier fitting (1) (1a) interposed between an insulator attached to a support such as a tower, and an inner plate (4) between a pair of outer plates (2) and (3). ), The length of the outer plate (2) and (3) and the inner plate (4) can be connected to each other at a predetermined adjustment position. The outer plate (2) (3) and the inner plate (4) are further provided with a pair of extendable and retractable adjustment tools (20) (70) used when adjusting the length in a stretched state. (22) (24) (72) (7)
Engaging parts (2a), (3a), (8), (18) with which 1) engages
Vernier fittings, each of which is formed with: 2. A tension clamp (1) holding an overhead transmission line.
5) The vernier fittings (1) and (1a) of claim 1 are interposed between the insulator attached to a support such as a steel tower, and the adjustment tool (20) is attached to the vernier fittings (1) and (1a). ) (7
0), the outer plates (2) and (3) and the inner plate (4) are disconnected from each other, and the outer plates (2) and (3) are adjusted using the adjusting tools (20) and (70). )
The length of the vernier fittings (1) (1a) is adjusted by adjusting the position of the inner plate (4) and the outer plate (2) (3) and the inner plate (4) are connected at the adjusted position. And then removing the adjusting tools (20) and (70). 3. The engaging portions of the outer plates (2) and (3) are engaging projections (2a) and (3a) formed on side surfaces, and the engaging portion of the inner plate (4) is at least 1
3. The method for adjusting sag of an overhead transmission line according to claim 1, wherein there are two engagement holes. 4. The adjusting tool (20) is attached to a main body (22) to which a double-acting cylinder (21) is attached, and to a distal end side of a piston rod (23) of the double-acting cylinder (21). An engagement portion (24) attached thereto, and one of the main body (22) and the engagement portion (24) is engaged with the engagement portion (2a) (3a) of the outer plate (2) (3). And the other is engaged with the engaging portion (8) of the inner plate (4), and the main body (22) and the engaging portion (24) are moved forward or backward by the piston rod (23). Vernier fittings (1)
The vernier fitting or the vernier according to claim 1, wherein the positions of the outer plate (2) (3) and the inner plate (4) are adjusted by separating or approaching in parallel with the longitudinal direction of the vernier.
Of adjusting the sag of overhead transmission lines. 5. The double-acting cylinders (73a) and (73) arranged at approximately 180 degrees opposite each other with the vernier fitting (1a) interposed therebetween.
b) and the piston rods (74a) of the double-acting cylinders (73a) (73b).
(74b) is provided with an engaging portion (71) to which the tip side is attached, and one of the main body (72) and the engaging portion (71) is engaged with the outer plates (2) and (3). Department (18)
And the other is engaged with the engaging portion (8) of the inner plate (4), and the main body (72) and the engaging portion (71) are moved forward or backward by the piston rods (74a) (74b).
2. The vernier according to claim 1, wherein the position of the outer plate (2) (3) and the position of the inner plate (4) are adjusted by separating or approaching the vernier fitting (1a) in parallel with the longitudinal direction of the vernier fitting (1a). The method for adjusting the sag of a metal fitting or an overhead transmission line according to claim 2.