JPH0419765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a conductor slack adjustment device for a conductor tensioning device for stretching an overhead power transmission line having a plurality of conductors or more.

[Conventional technology]

When installing overhead power transmission lines between steel towers, consider the insulation spacing, conductor tensioning force, strength of the transmission tower and transmission equipment, wind power, weather conditions such as temperature, and other conditions for the installation of power transmission lines. and then tension it with the selected slackness. Multi-conductor installation For example, when installing 6 conductors, first pull the top two conductors to the conductor tensioning device using a come-along, wire rope, etc., and then attach the retaining clamp to the specified position to tighten the conductor tensioning device attached to the tower. Once the wire rope is attached to the device and the conductor load is transferred from the come-along to the conductor tensioning device, the slackness of the top two conductors is finely adjusted using turnbuckles, etc. Once this is completed, the middle two conductors are removed using the method described above. The slackness was finely adjusted by attaching it to a conductor tension device, and the slackness of the lower two strips was also finely adjusted using the same method.

[Problem that the invention attempts to solve]

By the way, in the past, the slackness was adjusted for each thread, and it was necessary to observe the slackness each time a fine adjustment was made, so it took a considerable amount of time and effort to adjust the slackness of one thread. Therefore, there is an inconvenience in that adjusting the sag of a plurality of conductors requires a great deal of time and effort. Furthermore, even if the slackness adjustment of one conductor is completed, the slackness will change depending on the slackness adjustment of other conductors that share the same conductor side yoke, so it is impossible to make the slackness of all the conductors uniform. This becomes extremely difficult, causing problems with the conductor twisting characteristics, the stability of the hanging machine, etc., as well as causing twisting of the conductor tension device, tension imbalance, etc.

The present invention has been made in view of the above points, and is capable of collectively adjusting the sag of all conductors in a multi-conductor tensioning device substantially uniformly and in a relatively short time. The purpose is to provide equipment.

[Means for solving problems]

The first configuration of the present invention to achieve this purpose is as follows.
This will be explained using FIG.

In a multi-conductor tensioning device in which a plurality of retaining clamps 21 are connected to a conductor-side yoke 1 connected to a steel tower via an insulator chain 9 via connecting fittings, the length is adjusted in the middle of each of the connecting fittings. A connecting fitting 1 that interposes a link mechanism 32 and connects to both ends of the link mechanism 32.
A fluid pressure actuator 22 is connected between the fluid pressure actuators 1 and 14 via links 23 and 24, and each fluid pressure actuator 22 has an equal pressure receiving area and is connected to a common fluid pressure source via a fluid path. In this method, a means for regulating the pressure of the fluid pressure source is provided to equalize the operating force of each fluid pressure actuator.

[Effect]

As shown in FIGS. 1 and 2, as a preparatory step for adjusting the conductor sag all at once using the device of the present invention, all retaining clamps are attached to the conductor side yoke 1 attached to the steel tower via the insulator link 9, etc. After temporarily tightening the conductors 21, install the fluid pressure actuators 22 in parallel between the connecting fittings as shown in the figure, or install the hydraulic actuators 22 in parallel to the connecting fittings in advance and then connect all the retaining clamps 21. After temporarily tightening the conductors, these fluid actuators 22 are connected to a fluid pressure source provided on the tower side. Now, when the pump discharge pressure is introduced from the fluid pressure source to each fluid pressure actuator 22, each fluid pressure actuator 22
is shortened at the same time. By shortening the fluid pressure actuator 22, the links 23 and 24 tilt the connecting fittings 11 and 14 so that the axis of the fluid pressure actuator 22 is located on the conductor axis as shown in FIG. Positioned on the line, the length adjustment links 12 and 13 are in a slack state.

Since the pump discharge pressure during operation of the fluid pressure actuator is maintained at a preset pressure by the pressure regulating means, all the fluid pressure actuators with the same pressure receiving area have the same operating force, and the conductor attached to the retaining clamp 21 are all stretched with the set conductor tension.

Here, if the length adjustment links 12 and 13 are connected in a straight line or substantially in a straight line and then the pump discharge pressure is lowered, the fluid pressure actuator 22 will move after the conductor tension overcomes the operating force of the fluid pressure actuator. Since the length adjustment links 12, 13 and the connecting fittings 11, 14 are located on the conductor axis and tension the conductor, all the conductors attached to the retaining clamp 21 are tensioned with approximately the same slack. will be established. Therefore, compared to a conventional device that repeatedly adjusts the slackness and observes the slackness for each strip, the slackness adjustment work can be significantly simplified, and labor and working time can be significantly reduced.

〔Example〕

Embodiments of the present invention will be described based on the drawings. In Figures 1 and 2, 1 is the conductor side yoke of an 8-conductor tension device, and 5 horizontal yokes 2, 3, 4,
5, 6 and two vertical yokes 7, 8 are integrally connected in a lattice shape, and connected to the tower arm via a connecting metal fitting etc. by four insulator chains 9 connected to the intermediate horizontal yoke 4. Connecting fittings 10, 11, 12, 13 are provided at both ends of the horizontal yokes 2, 3, 5, 6, respectively.
14, 15, 16, and 17 in sequence, and furthermore, in the upper second horizontal yoke 3, the connecting fitting 18 is connected to the upper 4
In the horizontal yoke 5 of the second stage, the connecting fittings 18 and 19 are
In the lowermost horizontal yoke 6, the connecting fittings 18, 19,
By attaching the retaining clamps 21 through the retaining clamps 20, the lower the retaining clamps 2, the lower the retaining clamps 2.
1 is pushed forward.

Among the connecting fittings that connect the retaining clamp 21 to the conductor side yoke 1, links 23 and 24 are connected between the connecting fittings 11 and 14 by connecting pins 25 and 26, and these links 23 and 24 are connected to the hydraulic actuator. A certain hydraulic cylinder 22 is arranged parallel to the axis of the connecting fittings, and the connecting fittings 12 and 13 between the connecting fittings 11 and 14 have a large number of through holes 27 and 2 in the longitudinal direction.
Use a length adjustment link with 8 holes. Each hydraulic cylinder 22 has an equal pressure receiving area and is connected to a distributor 29 attached to the central insulator side of the conductor side yoke 1 by a hose 30, and the distributor 29 is connected to a hydraulic pump via a directional control valve by a main hose 31. are doing.

The hydraulic pump constitutes a hydraulic unit including an oil tank, a directional control valve, a relief valve, a pressure gauge, a manual pump, etc., and is installed at an appropriate location on the steel tower column or on the ground.

The relief valve defines the upper limit of the pump discharge force, and maintains the conductor tensile force of all the hydraulic cylinders 22 having the same pressure receiving area at a predetermined value. In other words, the pump discharge pressure led to each hydraulic cylinder 22 increases rapidly by pulling the conductor, but when the pump discharge pressure exceeds the set pressure of the relief valve, the relief valve blows, so the pump discharge pressure becomes a relief. The pressure is maintained at the valve's set pressure. Therefore, the conductor tensile force of all the hydraulic cylinders 22 having the same pressure receiving area is equal, and its value is given by the product of the pump discharge pressure and the pressure receiving area.

The conductor is attached to the conductor-side yoke 1, which is attached to the steel tower via an insulator link, etc., by using a wire rope with a pulley or the like to attach a restraining clamp, which has been attached in advance at a factory, to a predetermined position of the extended conductor of a predetermined length. Then, in the same manner, attach the required number of retaining clamps to the conductor side yoke 1 and temporarily tighten all the conductors. A hydraulic cylinder 22 is attached to the hydraulic cylinder 22 via links 23 and 24, and each hydraulic cylinder 22 and a hydraulic pump are connected via a distributor 29. Incidentally, the hydraulic cylinder may be attached to the connecting fittings before the retaining clamp is attached to the connecting fittings.

When the pump discharge force is introduced to all the hydraulic cylinders 22 through the distributor 29, all the hydraulic cylinders 22
simultaneously shortens and stretches the conductor. At that time link 2
3 and 24 are connecting fittings 11 and 1 as shown in FIG.
4 and position the hydraulic cylinder 22 on the conductor axis, the length adjustment links 12 and 13 are deviated from the conductor axis and become slack. In this state, the pump discharge pressure becomes the set pressure of the relief valve, so all the conductors are stretched with a predetermined conductor tension. Here, the length adjusting links 12 and 13 are uncoupled, the through holes 27 and 28 are selected, the length adjusting links 12 and 13 are connected linearly or substantially linearly, and then the hydraulic cylinder 22 is actuated. When the hydraulic pressure is gradually lowered to the tank pressure, after the conductor tension overcomes the conductor tensile force of the hydraulic cylinder, the connecting fittings 11, 14 and length adjustment links 12, 13 return to the normal state where they are located on the conductor axis. , hydraulic cylinder 2
2 is deviated from the conductor axis, and all the conductors are stretched with approximately the same degree of slack. Note that the slackness may be adjusted by controlling the pump discharge pressure using a relief valve based on the conductor tension detected by a tension meter. When the slackness adjustment is completed, the hydraulic cylinder 22, distributor 29, hydraulic unit, hose, etc. are removed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a multi-conductor tensioning device, a length adjustment link mechanism is interposed between each of the connecting fittings that connect the retaining clamp to the conductor side yoke, and the length adjusting link mechanism is connected to both ends thereof. A fluid pressure actuator is connected via a link between the two connecting fittings, and all the fluid pressure actuators have the same pressure receiving area so that a predetermined hydraulic pressure is introduced. conductors can be pulled simultaneously and with equal tension. Therefore, if the hydraulic pressure is reduced by eliminating the slack in the length adjustment link mechanism in this state, all the conductors of the conductor tensioning device will be tensioned with approximately uniform slack, and the slack can be adjusted. The work is completed. Therefore,
The device of the present invention can shorten working time and reduce labor compared to conventional devices that repeatedly perform fine adjustment and observation of sag for each wire, simplifying the sag adjustment work in this type of multi-conductor tensioning device. It is useful for saving time and labor. Moreover, there is an advantage that the effect becomes larger as the number of conductors increases.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a diagram illustrating how to use the same. 1...Conductor side yoke, 9...Insulator chain, 11,1
5... Connection fittings, 12, 13... Length adjustment links, 21... Retention clamps, 22... Fluid pressure cylinders, 23, 24... Links.

Claims (1)

[Claims] 1. In a conductor tensioning device in which a plurality of retaining clamps are connected to a conductor-side yoke connected to a steel tower via an insulator chain via connecting fittings, a link mechanism for length adjustment is provided in the middle of each of the connecting fittings. A fluid pressure actuator is connected via a link to the middle of both connecting fittings that are interposed and connected to both ends, and each fluid pressure actuator has an equal pressure receiving area and is connected to a common fluid pressure source via a fluid path. A device for collectively adjusting conductor slackness of a plurality of conductor tension devices, characterized in that the fluid path is provided with means for regulating the pressure of a fluid pressure source.