JPH06245338A - Stringing method and scaffold/frame therefor - Google Patents

Abstract

PURPOSE:To provide a stringing method for allowing wire stretching work under stable conditions without requiring any special skill. CONSTITUTION:A scaffold frame 1 serves as a scaffold for work and a frame for suspending an insulator unit. An insulator unit G is laid on the scaffold/ frame on the ground which is then hoisted upto a wire stretching position of a steel tower where wire stretching work is conducted. This method provides a scaffold easily for an unskilled worker while protecting the insulator unit against damage as much as possible in the hoisting work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire construction method for a high-voltage power transmission line, and more particularly to an improvement in tight-line work for connecting an extended electric wire to an insulator device.

[0002]

2. Description of the Related Art Tightening work in the conventional overhead wire construction method is performed by using a wire wheel for tight wire between an insulator device suspended in advance on a steel tower arm and a tip metal fitting (restraining clamp) of the wire end in a temporarily raised state. It was done by assembling a cicada with wires and winding up the cicada's wire. For such work, the operator takes a cicada that is heavy and difficult to handle, straddling the electric wire or wire, to the tip of the electric wire, which is considerably distant from the tower arm, where one end of the cicada is connected to the electric wire. Need to connect.

Moreover, the movement of the worker and the connection work to the electric wire of the cicada are said to be connected by the safety belt, but they are carried out under the extremely unstable condition that almost only the electric wire supports the body. There is no choice but to say, it is an acrobatic work, which is the most burdensome work for the overhead wire work, and also requires highly skilled work. In particular, in the recent overhead wire work in which the insulator length becomes longer as the transmission capacity becomes larger, this becomes a more serious problem as a factor that makes it difficult to secure workers. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides an overhead wire construction method capable of performing tight-line work under stable conditions without requiring special skill. The purpose is to provide a platform that also serves as a scaffold used for such an overhead wire construction method.

[0005]

In the overhead wire construction method according to the present invention, a scaffold-cum-mounting platform that doubles as a scaffold for work and a lifting platform for an insulator device is used. The scaffolding / supporting platform supporting the insulator device is then hung up to the position of the tension line on the steel tower, and then the scaffolding / combining platform is used as a scaffold to perform the cording work.

According to this overhead wire construction method, the scaffolding / cumulative platform used for hoisting the insulator device serves as the scaffolding for the tight line work as it is, so that a stable scaffold with the best arrangement conditions for the tight line work is secured. be able to.

Further, this overhead wire construction method has a great advantage not only in securing the scaffolding for work as described above but also in lifting work of the insulator device. That is, for example, in the case of an insulator device having a length of more than 10 m and a weight of 4 to 5 ton as in the case of transmitting 1 million volts, if the conventional vertical suspension is used, the lifting work is extremely difficult. Not only that, but there is an even greater problem that individual insulators are easily damaged during the lifting operation. On the other hand, according to the present invention, the insulator device is hoisted in a state of being completely supported by the scaffolding / mounting platform, so that the serious problem of damage to the insulator device can be effectively avoided.

The present invention also applies the above-mentioned overhead wire construction method to a prefabricated overhead wire construction method, in which a split wire interposed between electric wires is provided on each of the front and rear sides of the insulator device corresponding portion and the intermediate steel tower arm corresponding portion. In order to separate the steel tower arm corresponding part prior to lifting the scaffolding platform, the end of each insulator device corresponding part where the steel tower arm corresponding part is separated is temporarily fixed to the steel tower arm. ing.

The reason why the split wire is divided into three parts in this way is to facilitate the work of temporarily fixing the electric wire to the steel tower arm prior to lifting the scaffolding / mounting base. In other words, various methods are possible for temporarily fixing the electric wire to the steel tower arm, but according to this method, the end of the insulator device corresponding portion is temporarily fixed to the steel tower arm by separating the steel tower arm corresponding portion. It can be temporarily fixed by the work of being located at the optimum position and connecting it to the steel tower arm. At this time, a cicada will be used to separate the steel tower arm corresponding part, but since the steel tower arm corresponding part is somewhat longer than the width of the steel tower arm, connect the cicada to the end of the insulator device corresponding part. The work can be done from the tower arm. Therefore, a series of operations can be performed on the steel tower arm, and this temporary fixing operation can be completed without the conventional acrobatic operation.

The scaffolding / carrying platform used for the above-mentioned overhead wire construction method has an insulator supporter in the center, a scaffolding around the insulator supporter, and a protective fence around the scaffolder. It is preferable that the structure has.

In addition, it is preferable that the scaffolding / mounting base can be attached / detached so that the protection / fence can be removed or attached according to the progress of the work.

[0012]

EXAMPLES Examples of the present invention will be described below. The following example is an example of a prefabricated overhead wire construction method, which is basically the same as the conventional one except that a split wire with a three-part structure is used as a split wire interposed between electric wires in the prefabricated method. The method is to extend the electric wire, and the main feature is the wire tightening method.

The steps will be described below with reference to the drawings. First, as shown in FIG. 1, a split wire W having a three-part structure is used to extend an electric wire (only the tip end fitting Cj at the tip is shown in the drawing). The split wire W has a structure in which the insulator device corresponding portions Wg, Wg on both front and rear sides and the intermediate tower arm corresponding portion Wa are separably connected, and the length of each insulator device corresponding portion Wg, Wg is GL +
α (GL; insulator device length), and the length of the steel tower arm corresponding part Wa is AL + α (AL; width of steel tower arm).

When the wire drawing is completed, temporary fixing is performed. As shown in FIG. 2, this temporary fixing is an insulator device for connecting parts Aj, Aj and split wires W provided at the upper end of a steel tower arm A (only the upper end is schematically shown in the figure). set semi S _1, S ₁ between the front end of the corresponding portion Wg, is done by connecting the connecting portion Aj attract the ends of the insulator device corresponding portion Wg this semi S _1, S _1. If the state where the temporary fixing is completed is the state shown in FIG. 3 and there are four conductors, the above work is repeated for four electric wires for one phase, and the state shown in FIG. 4 is obtained.

After the wire drawing and temporary fixing for one phase are completed as described above, the wire tightening work is started. Tightening work starts with the work of hoisting the insulator device G by the platform 1 which also serves as a scaffold. This hoisting work is performed in the following procedure. First, on the ground, the insulator device G is placed horizontally on the scaffolding / mounting base 1. Then, as shown in FIG.
Between the one end of the scaffolding gantry 1 and the steel tower arm A, and between the other end of the scaffolding gantry 1 and the wire end fitting Cj, an appropriate number of semi S ₂ , S ₂ , ... (in the figure, For simplification, only two sets are shown), and this semi S ₂ , S ₂ , ...
The scaffolding / mounting base 1 and the insulator device G are lifted up to the position shown in FIG.

Here, for hoisting the scaffolding / mounting base 1, it is necessary to connect one end of some of the semi-S _{2 to} the metal fitting Cj at the tip of the electric wire.
_Since it suffices to suspend ₂ vertically, it is not necessary for an operator to bring the semi-S ₂ itself to the position of the tip fitting Cj as in the case of the conventional tight-tie work. That is, for example, a light and easy-to-handle pilot rope and a simple pulley are temporarily connected to the end fitting Cj, and by using this, the semi-S ₂ can be lifted from the ground, thereby reducing the burden on the operator.

Next, the scaffolding / mounting base 1 is used as a scaffold, and the earth side connecting fitting Ga of the insulator device G is connected to a predetermined connecting fitting Aa of the steel tower arm, and then each electric wire is sequentially connected to the insulator device G. As shown in FIGS. 7 and 8, this connecting work is performed by pulling the wire to a predetermined position with a semi-S ₃ assembled between the connecting fitting Gj of the insulator device G and the tip fitting Cj of the wire, and then the tip thereof. This is done by connecting the part metal fitting Cj to the connection metal fitting Gj. FIG. 8 shows the state immediately before the connection. In this state, the split wire W (only the insulator device corresponding portion Wg is present at this time) is loosened, and the insulator device G is lifted from the scaffolding / mounting base 1.

The scaffolding / mounting base 1 will be described below.
As shown in detail in FIG. 9, the scaffolding / mounting base 1 is formed by combining iron aggregates in a grid shape, has an insulator supporter 2 in the center, and a side scaffolding 3 in the periphery thereof.
a, 3a and an end scaffold 3b are provided, and a protective fence 4 is provided around each scaffold 3a, 3a, 3b. The protective fence 4 is formed of a plurality of units, and each unit can be attached and detached.

Although the embodiments described above are related to the prefabricated overhead wire construction method that is often used for large-capacity transmission lines, the overhead wire construction method according to the present invention can of course be applied to other than the prefabricated construction method. However, it can be said that it is more effective than the non-prefabricated construction method in terms of securing a stable footing. That is, in the non-prefabricated construction method, it is necessary to connect the connecting metal fitting to the tip of the electric wire during the tight wire work, and a stable scaffold can be secured for this work.

[0020]

As described above, the overhead wire construction method according to the present invention uses the scaffolding / cumulative platform that doubles as a working scaffolding and a suspension platform for the insulator system. Therefore, the scaffolding used for lifting the insulator system is used. By using the combined platform as it is as a scaffolding for wire-tightening work, it is possible to carry out wire-tightening work safely and with good workability under stable conditions without requiring special skill. Further, since the insulator device is hoisted while being completely supported by the scaffolding / mounting base, it can greatly contribute to the prevention of damage to the insulator device.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state of an extended wire.

FIG. 2 is a schematic diagram showing a state of temporary fixing work.

FIG. 3 is a schematic view showing a state of temporary fixing.

FIG. 4 is a schematic diagram showing a temporarily fixed state of an electric wire for one phase.

FIG. 5 is a schematic view showing a state of hoisting work of a scaffolding / mounting base.

FIG. 6 is a schematic view showing a state where the scaffolding / mounting platform is lifted to a predetermined position.

FIG. 7 is a schematic diagram showing a state of work for connecting an electric wire to the insulator device on the scaffolding / mounting base.

FIG. 8 is a schematic view showing a state in which the insulator device is lifted up from the scaffolding / mounting base due to a tension line.

FIG. 9 is a perspective view of a scaffolding / mounting base.

[Explanation of symbols]

 1 Scaffolding / mounting platform 2 Insulator support 3b End scaffold 3a Side scaffold 4 Guard fence A Steel tower arm G Insulator W split wire Wg Insulator support Wa Insect arm support

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshisada Ishida 3-27-12 Horikiri Katsushika-ku, Tokyo Yasuda Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A method for constructing an overhead wire which uses a scaffolding / scaffolding platform that doubles as a scaffolding for work and a lifting platform for an insulator device. The scissoring device is placed horizontally on the scaffolding / stand, and then mounted on the ground. An overhead line construction method in which a scaffolding / combining platform that supports the equipment is suspended to the position of the tension line on the steel tower, and then the scaffolding / combining platform is used as a scaffold to perform the cording work. 2. The split wire interposed between the electric wires has a three-part structure consisting of parts corresponding to the insulators on the front and rear sides and parts corresponding to the intermediate steel tower arm, and the steel tower arm is provided prior to lifting the scaffolding / mounting platform. The overhead wire construction method according to claim 1, wherein the corresponding portions are separated, and the ends of the insulator device corresponding portions in which the steel tower arm corresponding portions are separated are temporarily fixed to the steel tower arms. 3. The scaffolding / mounting base according to claim 1 or 2, wherein the insulator device support portion is provided in a central portion, and the scaffold portion is provided around the insulator device support portion. In addition, a scaffolding platform that has a protective fence around the scaffolding. 4. The protective fence is removable.
A scaffolding platform that is described in.