JPH08336215A - Insulator arm of steel tower for transmission line - Google Patents

Abstract

PURPOSE: To prevent an insular arm from supporting a transmission line while being shifted in the line direction at the time of laying the transmission line. CONSTITUTION: A tension insulator and a compression insulator constituting an insulator arm are coupled each other at the forward end parts thereof and coupled, at the base end parts thereof, to a steel tower body rotatably in the direction of line about a coupling pin aligned therewith. For example, an insulator base end metal 34 at the base end part on the compression insulator side is coupled through a coupling pin 4 with an insulator supporting metal 35 secured to the steel tower body. A positioning pin 40 to be inserted removably into holes 35b, 34a made, respectively, through the insulator supporting metal 35 and the insulator base end metal 34 is provided in the vicinity of the coupling pin 4. At the time of laying a wire, the positioning pin 40 is inserted in order to stop turning of the insulator arm and to hold the insulator arm at a reference position. When the positioning pin 40 is removed after laying the wire, the insulator arm can turn freely back and forth in the direction of line and the moveability of insulator arm is not damaged at all at the time of operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator arm of a transmission line tower.

[0002]

2. Description of the Related Art Generally, a transmission line tower is generally made of steel, but a part of the arm (bracket) is replaced with an insulator, that is, an insulator arm 2 as shown in FIG. The transmission line tower (the tower body is indicated by 1) has the feature that the size of the transmission line tower itself can be reduced.

An example of a conventional insulator arm of this type is shown in FIG.
It is shown in FIG. 10 (see Japanese Patent Laid-Open No. 6-203672).
In this insulator arm 2 ′, each of the base ends of a tension insulator (using a suspension insulator string or the like) 5 and a compression insulator (using a solid rod insulator such as a long stem insulator) 6 whose tip portions are connected to each other is a steel tower. The main body 1 has a structure in which the connecting pins 3 and 4 on the same straight line P are rotatably connected to the front and rear in the line direction. In addition, the tip ends of the tension insulator 5 and the compression insulator 6 are connected by a connecting pin 7, and a suspension clamp 9 that suspends and supports the power transmission line 8 is attached to this tip portion. In addition, each base end portion of the tension insulator 5 and the compression insulator 6 has an insulator base metal 11
And 14 are integrally formed, and the insulator base end fittings 11 and 14 are connected to the insulator support fittings 12 and 15 fixed to the steel tower body 1 through the connecting pins 3 and 4.

Then, as shown in FIG. 10, for example, with respect to the insulator support fitting 15, by contacting the side surface of the insulator base end fitting 14, the range of rotation of the insulator base fitting 14 (ie, the rotation of the compression insulator 6). A stopper portion 15a that regulates the range) is formed. A stopper portion is also formed on the insulator support fitting 12 in the same manner.

[0005]

The above-mentioned conventional insulator arm 2'is configured so that it can be smoothly rotated about the connecting pins 3 and 4 on the same straight line in the line direction. Since it is possible to follow the forward and backward movement of the support point (support position by the suspension clamp 9) in the track direction, there is no problem of tension imbalance of the transmission line between adjacent spans (spans on both sides of the tower) after laying the wire. . That is, assuming that the insulator arm cannot rotate back and forth in the line direction, the tension generated in the power transmission line fluctuates depending on various meteorological conditions (for example, temperature, wind speed, wind direction, etc.), so there is a difference in tension between adjacent diameters. There is a risk that the insulator arm will be damaged by being applied with an excessive bending load. However, since the insulator arm 2 ′ can be rotated back and forth in the line direction, such a problem does not occur.

By the way, when the power transmission line 8 is laid, as shown in FIG.
As shown in, the transmission line 8 is placed on the gold wheel 20 attached to the tip of the insulator arm 2 ′ so that the transmission line 8 can slide freely, and the tension T acting on the transmission line 8 is the same in any span. A method is employed in which the tension T applied to the left and right of each gold wheel 20 is balanced and then the suspension clamp 9 is used for tight binding.

However, since the insulator arm 2'is rotatable back and forth in the direction of the track as described above, the track 2 shown in FIG. 12 (b) with respect to the reference position K shown in FIG. 12 (a). Even if the position is deviated in the direction (the amount of deviation is indicated by L), the tension T of the power transmission line 8 balances, so there is a problem that the power transmission line 8 is bound (supported) at the wrong position E. .

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and is free to rotate back and forth in the line direction after laying an electric wire so as not to cause tension imbalance of transmission lines between adjacent spans. The purpose is to provide an insulator arm for a transmission line tower that can support the transmission line at the reference position without shifting in the line direction when laying the wire.

[0009]

SUMMARY OF THE INVENTION In the present invention for solving the above-mentioned problems, each of the base ends of a tension insulator and a compression insulator whose tip portions are connected to each other is connected to a tower main body, and a connecting pin is arranged on the same straight line. In an insulator arm of a transmission line tower, which is rotatably connected in the front-back direction in the track direction, the insulator arm is rotated at the connecting portion between the base end of one or both of the tension insulator and the compression insulator and the tower body. It is characterized in that a detachable positioning and fixing means for temporarily blocking the above is provided.

According to a second aspect of the present invention, the positioning and fixing means is constituted by a positioning pin that is inserted into a hole formed in the base end portion of the insulator and a member on the main body of the tower in the vicinity of the connecting pin. .

[0011]

In the above structure, the positioning and fixing means is mounted when the electric wire is laid. Then, since the insulator arm is positioned at the reference position and is prevented from rotating back and forth in the line direction, the insulator arm can support the power transmission line at the reference position. If the positioning and fixing means are removed after the installation work is completed, the insulator arm can rotate back and forth in the line direction, so that the tip of the insulator arm moves along the line direction of the power transmission line according to the fluctuation of the tension acting on the power transmission line. It can move freely without tension imbalance.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an insulator arm 22 of a transmission line steel tower (a steel tower body is indicated by 1) according to an embodiment of the present invention. As shown in the figure, in the insulator arm 22, the base ends of the tension insulator 25 and the compression insulator 26, whose tip portions are connected to each other, are attached to the tower main body 1 and the connecting pins 3 and 4 on the same straight line P are centered. It is a structure in which it is rotatably connected to the front and back in the track direction. The tip ends of the tension insulator 25 and the compression insulator 26 are connected by a connecting pin 7, and a suspension clamp 9 that suspends and supports the power transmission line 8 is attached to this tip portion. Also,
Each of the base ends of the tension insulator 25 and the compression insulator 26 integrally has insulator base metal fittings 31 and 34.
Insulator support metal fittings 1 and 34 fixed to the tower main body 1
It is connected to 2 and 35 via the connecting pins 3 and 4. Further, as shown in FIG. 2, for example, by contacting the side surface of the insulator base end fitting 34 with the lower insulator support fitting 35, the rotation range of the insulator base end fitting 34 (that is, the rotation range of the compression insulator 26). ) Is formed to form a stopper portion 35a. A stopper portion is also formed in the upper insulator support fitting 32.

The insulator arm 22 of this embodiment is similar to the conventional insulator arm 2'in the above-mentioned range, but as shown in FIG. 2, the insulator support fitting 35 below the insulator arm 22 is used.
Is slightly elongated and has a hole 35b at the insulator side position of the connecting pin 4, and the insulator base end fitting 34 has a corresponding hole 34a.
And a positioning pin 40 that is detachably inserted into both holes 35b and 34a that coincide with each other when the insulator arm 22 is positioned at the reference position K. This positioning fixing pin 4
Reference numeral 0 constitutes positioning fixing means.

5 to 7 show an embodiment of the insulator arm of claim 3. As shown in detail in FIGS. 6 and 7, this insulator arm 22 ′ is provided with a positioning pin 40 ′ at a position closer to the tower main body 1 than the position of the connecting pin 4. That is, the position of the connecting pin and the position of the positioning fixing pin are opposite to those in FIG. In this case, the stopper 35'a is provided at the tip position of the insulator support fitting 35 '. In this case, as shown in FIG. 5, when the connecting pin 4 is provided at a position on the outermost surface of the steel tower body 1 so that the insulator support metal fitting 35 ′ is inside the outermost surface of the steel tower body 1, the insulator arm 22 The overhang length can be shortened as much as possible, which is effective for making the transmission tower compact.

When the transmission line 8 is laid on the transmission line tower having the above-mentioned insulator arm 22, the insulator arm 22 is positioned at the reference position K, and the positioning fixing pin 40 is aligned with the insulator support metal fitting 35 and the insulator base metal fitting 34. Both holes 35b, 34a
, The insulator arm 22 is prevented from rotating during the electric wire laying work, and is held at the reference position. Therefore, the insulator arm 22 does not deviate from the reference position during the electric wire laying work, and can support the power transmission line 8 at the reference position.

When the wire laying work is completed, the positioning fixing pin 40 is removed. Then, the insulator arm 22 can be easily rotated back and forth in the line direction about the connecting pins 3 and 4 on the same straight line, and the support point of the power transmission line 8 (support position by the suspension clamp 9) can be moved in the line direction. Since it can follow, the tip of the insulator arm 22 freely moves along the line direction of the power transmission line according to the fluctuation of the tension acting on the power transmission line 8, and the adjacent spans (the spans on both sides of the steel tower) after the electric wire is laid. There will be no tension imbalance in the transmission line. Therefore, the insulator arm 2
No unreasonable bending load is applied to No. 2, and it is possible to prevent damage to the insulator or continuous collapse of adjacent towers.

Further, the positioning fixing pin 40 can be reused at the time of maintenance of the power transmission line (for example, movement of the electric wire or replacement of the electric wire). That is, when the insulator arm 22 is positioned and fixed at the reference position by using the positioning fixing pin 40 and the maintenance work is performed, the maintenance work is easy.

Although the positioning and fixing means is constituted by the positioning pin 40 in the embodiment, as shown in FIG. 3, for example, the insulator base end fitting 34 of the compression insulator 26 is attached via a removable rod or wire 45. The insulator arms 22 may be held at the reference position K by being connected to both sides of the steel tower body 1. The rod or wire 45 constitutes a positioning and fixing means.

Further, the positioning and fixing means is provided on the compression insulator 26 side of the insulator arm 22 in the embodiment, but the tension insulator 2
It may be provided on the 5 side, or may be provided only on the tension insulator 25 side.

Further, in each of the above embodiments, the tension insulator 25
The base end portion (upper end portion) of the is connected to the tower main body 1 through the insulator support metal fitting 32. As shown in FIG.
The base end of 5 may be rotatably connected directly to the position of the outermost surface of the steel tower body 1. In this case, the connection to the tower main body 1 may be performed via the universal joint 50. The base end portion on the compression insulator 26 side is basically the same as that of the above-described embodiment (the illustrated example has the same positional relationship between the connecting pin and the positioning pin as in FIG. 5).

[0021]

According to the present invention, since the detachable positioning and fixing means for temporarily mounting and fixing the insulator arm to the reference position is provided when the electric wire is laid, the positioning and fixing means can be attached when the electric wire is laid. , It is possible to prevent the insulator arm from shifting in the track direction and support the transmission line at the reference position when laying the wire. Further, since this positioning and fixing means can be reused at the time of maintenance of the transmission line, the maintenance work becomes easy. Since this positioning and fixing means is removed after the electric wire is laid, the movability of the insulator arm required during operation is not impaired at all.

[Brief description of drawings]

FIG. 1 is a front view showing an insulator arm of a transmission line tower according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a schematic plan view showing another embodiment of the positioning and fixing means in the present invention.

FIG. 4 is a diagram illustrating a power transmission line tower having an insulator arm, and is an overall front view of the power transmission line tower.

FIG. 5 is a front view showing an insulator arm of a transmission line tower according to another embodiment of the present invention.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is a front view of FIG.

FIG. 8 is a front view showing an insulator arm of a transmission line tower according to still another embodiment of the present invention.

FIG. 9 is a front view of an insulator arm of a conventional transmission line tower.

10 is a cross-sectional view taken along the line AA in FIG.

FIG. 11 is an explanatory view of a method of laying a transmission line as seen from the side of a transmission line tower.

FIG. 12 is an explanatory diagram of the transmission line when installed, as seen from above the transmission line tower.

[Explanation of symbols]

 1 Steel Tower Main Body 3,4 Connecting Pin 8 Power Transmission Line 9 Suspended Clamp 7 Connecting Pin 22 Insulator Arm 25,26 Tension Insulator 31,34 Insulator Base Metal Fitting 32,35 Insulator Support Metal Fitting 40 Positioning Pin

[Procedure amendment]

[Submission date] July 13, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Claims (3)

[Claims] 1. A base portion of a tension insulator and a compression insulator whose tip portions are connected to each other are respectively connected to a tower main body so as to be rotatable back and forth in the line direction about a connecting pin on the same straight line. In the insulator arm of the transmission line tower,
A transmission line steel tower, characterized in that a detachable positioning and fixing means for temporarily preventing rotation of the insulator arm is provided at a connecting portion between a base end portion of one or both of the tension insulator and the compression insulator and the steel tower body. Insulator arm. 2. The positioning fixing means is constituted by a positioning pin which is inserted into a hole formed in the base end portion of the insulator and a member on the steel tower body side in the vicinity of the connecting pin. Insulator arm of the power transmission line tower described. 3. The insulator arm for a transmission line steel tower according to claim 2, wherein the positioning pin is provided at a position closer to the steel tower body than a position of the connecting pin.