JPH0549128A - Slackness controlled aerial overhead earth-wire renewing work method - Google Patents

Abstract

PURPOSE:To facilitate the replacement by locking both ends of a new or old earth-wire on the veering ends of the constant tension springs of slackness controllers, which are provided in the two elevation-work buckets arranged near two adjacent utility poles, and shifting the buckets. CONSTITUTION:Work vehicles 16 are arranged unit by unit near adjacent two utility poles 15. The elevation-work bucket 19 loaded on the work vehicle 16 is attached to the top of a telescopic arms, and turns back and forth and right and left. The buckets 19 are brought close to the old earth-wire 20 between the utility poles 15, and both ends of the old earth-wire 20 are caught with the veering ends of the constant tension springs of the slackness controllers 1 provided in the buckets 19. Next, both ends of the old earth-wire 20 are cut and it is shifted to the position a specified distance apart from the high voltage aerial distribution line 17 by tuning the arms, and is let down on the ground, and the old earth-wire 20 is released. Next, a new earth-wire caught with the veering ends of the constant tension springs and is tied to the utility poles 15 by lifting up and turning the arms. Hereby, the earth-wire can safely be replaced, avoiding the distribution line 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an apex of an electric pole or the like for supporting an overhead high-voltage distribution line at a braid, that is, a ground wire support rod or a ground wire cap body provided on the top of the electric pole or a stilt of the electric pole. It relates to a method of replacing the supported overhead ground wire with a new one.

[0002]

2. Description of the Related Art The work of replacing an existing overhead ground wire with a new one and replacing the existing overhead ground wire is required to be performed while the high voltage overhead distribution line is in a live state.

In this hot line work, a new ground wire and an old ground wire to be removed from the top of the wire respectively hang down during the replacement work and approach a high-voltage overhead distribution line supported by a pole wire of a utility pole within a certain width or less. It is regulated so that it should not occur.

Therefore, the old ground wire and the new ground wire must be replaced while securing a distance of a certain width or more from the high-voltage overhead distribution line. Therefore, a method of suspending a large number of moving wagons at regular intervals on the old ground line, making each of these moving wagons support a new ground line, and bringing them close to the top of the utility pole to perform the remounting work, or Each pole is provided near the top of each pole, and a messenger wire is separately stretched between these poles, and a large number of moving wagons are hung on this messenger wire at regular intervals, and a new ground wire is provided. There is a method of supporting each mobile wagon and bringing them close to the top of the electric pole to perform the remounting work.

Further, as disclosed in Japanese Patent Laid-Open No. 1-91606, a rail body located at a certain width or more from each of the high voltage overhead distribution lines supported by the arm bar is provided from the top of each pole to the tip of the arm bar. A method is also used in which the old ground wire or the new ground wire is supported by a movable member that can move freely on the rail body and is pulled down or pulled up to replace the ground wire at a certain distance from the high-voltage overhead distribution line at all times.

[0006]

However, the method of suspending a large number of moving wagons on an old ground line and re-connecting the same is not reliable because the old ground line is burdened with an unexpected situation.
In addition, a method of suspending a large number of moving wagons by separately installing a messenger wire and re-installing it requires a lot of labor and time because a pole is set up on a utility pole or a messenger wire is installed. In addition, the method of installing the rail body and the moving member and re-installing it can work by securely separating the old ground wire and the new ground wire from the high voltage overhead distribution line, but if you prepare a separate dedicated member and install this on site Since it does not occur, it is troublesome and not always satisfactory.

Therefore, the present invention aims to solve the above-mentioned problems by providing a method for safely, simply and efficiently performing reconnection work while avoiding approaching a high-voltage overhead distribution line in a live state.

[0008]

In the replacement work for exchanging such an overhead ground wire with a new ground wire, the present invention cuts and removes the old ground wire between each two adjacent utility poles, and I installed a new ground wire.

And these old or new ground lines are
These both ends are locked to the buckets for work at high places, which are installed near the two electric poles in advance, and the buckets for work at high places are moved and moved.

However, the old ground wire or the new ground wire must be moved at a certain width or more from the overhead high-voltage power distribution line pulled or held between these electric poles, but the bucket for working at high places is several cm. The slack in the center of the old or new ground line increases just by moving.

For example, the length L of an electric wire whose both ends are supported by two electric poles is as follows.

[Formula 1] (However, S is the distance between utility poles and d is the sag.)

Now, the distance [s] between the electric poles is 70 m,
When the sag [d] is 1%, that is, 0.7 m, the length of the wire between the poles is

[Formula 2] Becomes However, the sag of this wire increases and
If it goes down 0 cm, the length of the wire between the poles is

[Formula 3] Becomes Therefore, in this case, the wire length is 0.02743 m.
It has been extended.

Conversely speaking, for example, the distance 70 between telephone poles
If the length of the electric wire of 2.7 m is 2.743 cm, the central portion of the electric wire is further lowered by 40 cm. Moreover, these aerial work buckets move at a moving speed of 50 m / min or more.

Therefore, the old ground line or the new ground line is locked to the aerial work bucket via the slack adjusting device so that the slack of the old ground line or the new ground line does not increase.

An electric or hydraulic motor can be used as the slack adjusting device, but as described above, the slack changes greatly in response to a slight change in tension, so that the slack is too large. = It is about the weight and it is not practical to attach it to a bucket for work in high places.

Therefore, according to the first aspect of the present invention, a constant tension spring is used as a slack control device that follows such a change in tension at high speed, and the constant tension spring is extended and wound up freely, and the old end is provided at the extension end. Each end of the wire or the new ground wire is locked.

According to a second aspect of the present invention, the sag controlling device used in the above method is provided with a rotatable shaft, and rotary plates are rotatably supported at a plurality of positions on the outer periphery of the shaft.
An outer periphery of the shaft is constructed by fixing a feeding end of a constant tension spring, which is provided so as to be able to be drawn and wound around one of the projecting shafts of each of the rotary plates, to the shaft, and a braking device capable of stopping the rotary plates. The end of the old ground wire or the new ground wire is locked and wound.

[0018]

In the constant tension spring of the slack control device according to the first aspect of the present invention, the load and the like do not change even if the spring is extended and shortened as the spring is extended.

Therefore, when the aerial work buckets having both ends of the old ground wire or the new ground wire moved and the distance between the buckets is changed, the spring is paid out or wound up, but the tension is not increased. It does not change, and therefore the sag does not change.

FIG. 7 is a graph showing the relationship between the elongation of the constant tension spring and the load. As can be seen from this graph, this constant tension spring has characteristics completely different from those of the mainspring and the wire-wound spring, and the load and torque are constant no matter how the elongation or rotation angle changes.

The tension T at the time of a tight line between electric poles can be roughly calculated by the following equation. However, w is the unit weight of the electric wire, s is the distance between the electric poles, and d is the sag.

[Formula 4] Now, the ground wire unit weight w is 0.23 kg / m, the distance s between the utility poles is 70 m, and the sag is 1%.
That is, when 0.7m

[Formula 5] Is.

Therefore, the above constant tension spring holds such tension, but the required tension varies depending on the weight of the ground wire and the distance between utility poles.

In the slack control device according to the second aspect, the plurality of rotating plates are stopped by the braking device according to the required tension.

That is, when each rotating plate on the outer periphery of the shaft is stopped by the braking device, the constant tension spring wound around the shaft acts by the force to wrap the spring, which causes the shaft to rotate and the old ground wire wound around the shaft. Or try to get more involved in the new ground line. However, tension is applied to the old ground wire or new ground wire, and it is held by a constant tension spring. Then, when the force that the old ground wire or the new ground wire is paid out from the shaft acts, the constant tension spring is also paid out, but the tension is constant.

When each of the rotary plates is made free, the constant tension spring is not left behind, and the rotary plates rotate as the shaft rotates.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

First, the sag control device used in the present invention will be described. 3 and 4 are schematic configuration diagrams of the sag control device 1, in which a shaft 3 of a drum 2 for winding and unwinding a rope is rotatably supported, and a gear 4 is attached to the shaft 3.
Is fixed so that the gear 4 rotates integrally with the drum 2. A shaft 5 is rotatably supported in parallel with the shaft 3, a gear 6 is fixed to the shaft 5 at the same position as the gear 4, and the gear 4 and the gear 6 are connected by a roller chain 7. Further, the gear 6 has 1/3 the number of teeth as compared with the gear 4. Rotating plates 8 are rotatably mounted at four positions on the outer periphery of the shaft 5, respectively, and two projecting shafts 9 are provided on one side of each rotating plate 8 in point symmetry with the shaft 5 as a center. A constant tension spring 10 is wound around and wound around the shaft 5, and its protruding end is fixed to the shaft 5. Each of these constant tension springs 10 is always urged to be wound around the protruding shaft 9. Further, a pair of brakes 11 that can hold the outer peripheral edge of each rotary plate 8 is provided for each rotary plate 8.

Then, each brake 11 is applied and each rotary plate 8
The hoisting and lowering rope 13 having a hook 12 at the tip, which is wound around the drum 2 in a state in which the rotation of the
However, when pulled in the feeding direction, the drum 2 rotates,
Shaft 5 through gear 4, roller chain 7, gear 6
However, the constant tension spring 10 is locked to the shaft 5, and the shaft 5 rotates while pulling out the spring 10 against the force of the constant tension spring 10, and the constant tension spring 10 is rotated. The spring 10 stops at a position balanced with a predetermined tension.

When the hoisting and lowering rope 13 wound around the drum 2 is loosened, the shaft 5 is rotated by the force of each of the constant tension springs 10, the shaft 3 is rotated via the roller chain 7 and the gear 4, and the rope 3 is rotated. Drums 13
Roll it up.

In this way, the constant tension springs 10 are unrolled or wound up, but a constant tension is maintained regardless of the length of extension.

Next, the construction method of the present invention will be described with reference to FIGS.

First, as shown in FIG. 2, an aerial work vehicle 16 is installed near each of the two adjacent utility poles 15, and is installed on the upper part of each utility pole 15 near the arm 18 through which the high voltage overhead distribution line 17 is drawn. An aerial work bucket 19 of each aerial work vehicle 16 is arranged. The sag control device 1 is installed in each of these aerial work buckets 19. Then, from each of these aerial work buckets 19, an operator attaches winding grips 21 to both ends of the old ground wire 20 between the two utility poles 15, and these aerial work buckets 19 of the respective aerial work buckets 19 are attached. The hook 12 of the hoisting and lowering rope 13 wound around the drum 2 of the sag control device 1 is hooked. In this state, both ends of the old ground wire 20 are cut. By this, old ground line 20
Both ends are supported by the drum 2 of each sag control device 1.

Then, as shown in FIG. 1, the two aerial work buckets 19 at both ends are respectively moved to move the old ground wire 20 above the high-voltage overhead power distribution line 17 so that the outside of these high-voltage overhead power distribution lines 17 is increased. Move to.

At this time, the two buckets 19 for working in high places move freely, so that the hoisting rope 1 from the drum 2 is lowered.
Although the wire 3 is unwound or rolled up, it is supported by the constant tension spring 10 as described above, and the old ground wire 20 moves while maintaining constant tension and slack. Therefore, the old ground wire 20 always moves away from the high-voltage overhead distribution line 17 in a live state at a certain width or more.

Then, the old ground wire 20, which has been moved to a side separated from the high voltage overhead distribution line 17 by a certain width or more, is landed on the ground at the location. To this end, the brakes 11 of the sag control device 1 are released, the rotary plates 8 are set in a rotation-free state, and the drums 2 are
Is rotated to reel out the hoisting and lowering ropes 13. As a result, the hoisting and lowering ropes 13 extend and the old ground wires 20 locked to the respective tips of the ropes descend to the ground.

Therefore, the hooks 12 of the hoisting and lowering ropes 13 are removed from the winding grips 21 on both ends of the old ground wire 20, and the hooks 12 are hooked on the winding grips 23 attached to both ends of the new ground wire 22 separately prepared, and the hooks 12 are again loosened. Each drum 2 of the degree control device 1 is rotated to wind each hoisting and lowering rope 13. As a result, each hoisting and lowering rope 13 is hoisted around the drum 2 and a new ground wire 22
Is pulled up to the side of the high voltage overhead distribution line 17.

While the new ground wire 22 is tightly connected, each brake 11 of each slack control device 1 is applied to fix each rotary plate 8 so that it cannot rotate. As a result, the new ground wire 22 is supported by the constant tension springs 10 and held by a constant tension. In this state, the buckets 19 for work at high places are respectively moved to pass the new ground wire 22 above the high-voltage overhead power distribution line 17 over a portion having a certain width or more and bring both ends to the top portion of each electric pole 15. Then, both ends of the new ground wire 22 are locked and fixed to the tops of the electric poles 15, and the hooks 12 of the hoisting and lowering ropes 13 are connected to the new ground wire 2 respectively.
Remove from the winding grips 23 at both ends of 2, and further remove each winding grip 23 from the new ground wire 22.

In this way, these operations are repeated for every two adjacent poles 15 to replace the old ground wire 20 with the new ground wire 22.
It will be replaced with.

In the above embodiment, the ratio of the gear 4 of the shaft 3 to the gear 6 of the shaft 5 of the sag control device 1 is set to 3: 1 and the torque applied to the shaft 5 is reduced to 1/3, but the invention is not limited to this. Not something. Further, since the constant tension springs 10 are provided on the four rotary plates 8, the torque can be changed in four steps by applying the brakes 11.
Therefore, the number of rotating plates 8 on which the brake 11 is applied may be increased or decreased depending on the required tension.

Next, FIGS. 5 and 6 are a side view and a cross-sectional view of a main part showing a concrete example of the sag controlling device 1. The shafts 3 and 5 are rotatably supported by both side frames 25, 25, and spring winding drums 26 are capped on the shaft 5 beside the rotary plates 8 rotatably supported by the shaft 5, respectively. It is fixed, and the tip of the constant tension spring 10 is fixed to the outer circumference of each of the spring winding drums 26. In addition, each of the brakes 11 has two side frames 25, 2
It is fixed to each of the two bars 27 that I gave during 5.
Each of these bars 27 is provided along the circumference of the rotary plate 8 so as to be displaced, and two brakes 11, 11 are fixed to each of them. Each of these brakes 11 has two holding pieces 2
8 and 28 are pivotally supported by a shaft 29, and when the handle 30 is rotated, the outer peripheral edge of each rotating body 8 is held between the tips of the two holding pieces 28.

A manual winding / unwinding mechanism 31 is provided at one end of the shaft 3. This manual winding / unwinding mechanism 31
Is provided with a flange 32 at one end of the shaft 3, and a rotatable ratchet pawl wheel 33 is provided on the shaft 3 outside the flange 32.
Further, a nut 34 is screwed onto the outer shaft 3 of the ratchet pawl wheel 33, and a ratchet pawl (not shown) is engaged with the ratchet gear 33.

Now, when a handle (not shown) is fitted around the nut 34 and the nut 34 is turned, the nut 34 is rotated.
Is tightened and the ratchet ratchet wheel 33 is held between the collar 32 and the nut 34, and the ratchet ratchet wheel 33, the collar 32 and the nut 34 rotate integrally. At that time, the rotation of the ratchet pawl wheel 33 is not blocked by the ratchet pawl. Therefore, when the nut 34 is turned in this direction, the drum 2 is rotated and the hoisting rope 13 is hoisted around the drum 2.

When the rotation of the nut 34 is stopped,
The shaft 3 tries to rotate in the reverse direction by the tension of the hoisting and lowering rope 13, but the ratchet ratchet wheel 33 integrated with the nut 34 is prevented from rotating by the ratchet ratchet, and the shaft 3 and the drum 2 do not rotate.

On the other hand, when the nut 34 is rotated in the opposite direction,
The nut 34 separates from the ratchet ratchet wheel 33, and the ratchet ratchet wheel 33 does not rotate because the ratchet ratchet wheel 33 is locked by the ratchet ratchet, but the nut 34 and the shaft 3 rotate in opposite directions, and the hoisting and lowering rope 13 is fed out from the drum 2. You can

When operating the manual winding / unwinding mechanism 31, it goes without saying that the brakes 11 are released and the rotary plates 8 are free to rotate.

Further, at one end of the both side frames 25,
A first mounting hook 35 provided between the both side frames 25 is provided, one end of a belt 36 is locked to each of the both side plates 25 below the first mounting hook 35, and the other end of each belt 36 is secured. A second attachment hook 37 is provided, and each of these belts 36 is provided with a length adjuster 38 for each belt 36.

Therefore, each of the sag control devices 1 hooks the first attachment hook 35 on one side of the handrail of the aerial work bucket 19 so that each belt 36 is placed from below the aerial work bucket 19 to the opposite side of the handrail. By turning to the side, the second mounting hook 37 is hooked on the handrail, each length adjuster 38 is operated, and each belt 36 is tightened.
It is fixed to 9.

[0048]

According to the first aspect of the present invention, the preparation is completed simply by attaching the slack control device to the bucket for work at high places that is generally used, and the conventional high voltage overhead distribution line, utility pole, etc. There is no need to install any protective device or equipment.
Then, by holding both ends of the old ground wire that has been cut using two aerial work buckets and the new ground wire that will be installed from now on, and moving them to replace them, the replacement work is extremely easy, efficient, and labor-intensive. It does not cost.

Furthermore, since both ends of the old ground wire and the new ground wire are supported by the constant tension springs of the sag control device provided in the bucket for work at high places, the movement of the two buckets for work at high places is slightly different. Even if there is, the constant tension spring can quickly absorb these, hold the tension and sag without changing them, and move in that state.

Therefore, the old ground wire and the new ground wire can be always held from the high voltage overhead distribution line to a certain width or more, and the work is safe.

In addition to the above effects, the invention of claim 2 provides
Since the constant tension spring of the sag control device is distributed and provided on a plurality of rotating plates rotatably provided on the shaft, the tension required in the above construction method varies depending on the distance between electric poles and the wire diameter, Depending on the tension of each of these cases, it is possible to stop the rotation of any number of rotating plates and adjust the torque, so if one slack control device is prepared, it will be available on the old ground line. It can be used in various cases without applying more than the tension.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a state after cutting an old ground wire in a construction method of the present invention.

FIG. 2 is a schematic perspective view showing a state before cutting an old ground wire in the construction method of the present invention.

FIG. 3 is a schematic configuration plan view of a sag controlling device used in the construction method of the present invention.

FIG. 4 is a partial schematic side view of a sag controlling device used in the construction method of the present invention.

FIG. 5 is a side view of a sag controlling device used in the construction method of the present invention.

FIG. 6 is a cross-sectional plan view of a main part of a sag controlling device used in the construction method of the present invention.

FIG. 7 is a graph showing the characteristics of the constant tension spring of the sag control device used in the construction method of the present invention.

[Explanation of symbols]

 1 Sagging control device 5 Shaft 8 Rotating plate 9 Protruding shaft 10 Constant tension spring 11 Brake 15 Utility pole 19 Bucket for work at high places 20 Old ground line 22 New ground line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayasu Imai 3-27-12 Horikiri, Katsushika-ku, Tokyo Stock company Yasuda Manufacturing Co., Ltd. (72) Inventor Shinichi Yamashita 3-27-12 Horikiri, Katsushika-ku, Tokyo Stocks Company Yasuda Works (72) Inventor Hitoshi Inoue 4-62 Shimotakino, Takino-cho, Kato-gun, Hyogo Prefecture Fujii Electric Works Co., Ltd.

Claims (2)

[Claims] 1. In a replacement work for replacing an aerial ground wire with a new ground wire, the old ground wire is cut and replaced with a new ground wire between each two adjacent utility poles, and the old ground wire and the new ground wire are replaced. The movement is performed by feeding out the sag control device provided in each bucket for work at high places installed near the above two electric poles, and locking both ends of the old ground wire or the new ground wire with the feeding end of the constant tension spring that can be rolled up. A sag control overhead ground wire replacement method, characterized by moving each bucket for work at heights. 2. A slack control device rotatably supports a rotary plate at a plurality of positions on the outer periphery of a rotatable shaft, and a fixed shaft provided so as to be wound around the protruding shaft on one side of each rotary plate. Fix the feeding end of the tension spring to the shaft,
The slack control imaginary land according to claim 1, wherein each rotary plate is provided with a braking device that can be stopped, and an end of an old ground wire or a new ground wire is locked and wound around the shaft. Wire replacement method.