JPS58136209A - Method of tightening transmission wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention relates to a power transmission line tensioning method, and in the tensioning work of power transmission lines boarded up between steel towers, a light and simple device is used to quantitatively confirm the gradual increase in wire tension due to strain 11. It provides an innovative construction method that achieves the required tension and improves the conventional extremely dangerous aerial work.

The outline of the conventional construction method is shown in Figures 1 to 4. In Figure 1, OT is the tension tower, T/ is the suspension tower, E is the electric wire, and G is the insulator chain. shows that only one side of the building has been completed, but the lower section is under construction. Figure 2 shows that one of the workers, M, came along along the electric wire E to a position away from the tower L for the cable tension work.
(see figure) is installed, and the pulley attached to it (commonly known as a metal wheel) is pulled in several stages using the pulley at the end of the insulator chain G, wire rope W, and a winch on the ground.

As shown in Fig. 5.6, the come-along l has an outer cylinder/8. The inner cylinder/& are both half cylinders. The outer cylinder/g inner surface and the inner cylinder lh outer surface are tapered surfaces.
This is a well-known structure in which when the barbed part i6 is pulled in the direction in which the inner cylinder lb acts as a wedge, it securely holds the electric wire E, and when it is pulled in the opposite direction, it loosens.

As shown in Fig. 4, by a large number of pulleys P and wire ropes W,
Pull the come-along l with the electric wire E in its mouth using a winch (not shown), and record the amount of slack in the electric wire IIE between the steel towers T and T shown in Fig. 5 on a transit or the like. The tension of the wire E is calculated backwards from this slack measurement, and when the required tension is reached, the winch is stopped and the middle or cut end of the wire E is fixed to the end of the insulator chain G, but the details are omitted. .

There are two problems with this conventional tension line construction method:

(1) Because of the tight line, the distance to pull the come-along is usually 10 to 15 meters. The worker on the steel tower T moved from the tip of the hanging insulator chain G to the raised electric wire E, and the wire ran on the electric wire E to reach 15ml! You have to go ahead and attach a come-along with a wire rope and a pulley. Since this work was carried out in the air at a height of 100 to 150 WL above the ground, they were forced to perform dangerous work that was unacceptable from a safety standpoint.

(2) The conventional method of observing the electric IIE until it reaches the specified tension due to tension, as observed by Yumitaka Takama, is a completely wasteful wait when the construction site is in a mountainous area, where it is often difficult to see due to rain or fog. I couldn't avoid time.

Now, the outline of this invented construction method that improves the above problem is to raise the power transmission lines between the steel towers, then hang the wire pulling device using a fluid pressure cylinder near the tip of the insulator chain suspended from the tower, and then raise the wires. The midway of the electric wire is engaged with the pulling device actuating part, and the electric wires in the wire section are successively pulled toward the insulator side by driving the pulling device, and the hydraulic cylinder is activated. When the indicated pressure reaches a value corresponding to a predetermined wire tension, the guide is stopped, the wire is connected to the insulator end in this state, and then the guide device is removed. This is a wire tensioning method.

Conventionally, in order to pull the wires with a winch, it was necessary to install a come-along at nine positions far enough away from the wires to pull them together, but this invention uses a fluid pressure cylinder to pull the wires at hand. The work becomes extremely safe because the tag-b device of the present invention can be attached and detached, and the electric wires can be secured and disconnected from a stable footing without leaving the tower.

7 to 9 are explanatory diagrams of an embodiment of the power transmission line guide device of the present invention, in which the rear end of the hydraulic cylinder IO, which is the main body of the device, is attached to the tip of the insulator chain G.

The outer cylinder of the cylinder IQ and the tip of the rod 10a are provided with wire gripping parts // and /, respectively, and the middle of the raised electric wire E is engaged with these and the gripping parts, respectively. Grasping part//
, 7.2 can be easily released when engaging any part of the electric wire E, and after engagement, the gripping and releasing operations can be performed using hydraulic pressure. The grasping part//.

/J is gripped and released alternately by the hydraulic control device in accordance with the movement in and out of the cylinder rod 10α. Tsumashi grasping part//
When gripping the electric wire E, the gripping part 7.2 is released, the rod 10a is pushed out, and the position of the gripping part l- with respect to the electric wire E is pushed forward. Then, after gripping the gripping part/l, releasing the gripping part/l and pulling back the rod 10a, -
Push the line E to the rear of the grasping part/l. In this way, the electric wires E are pulled together one by one by the rod tOa. Figure 8 shows the place where the rod 10G is being pulled, and the electric wire E
The guide roller 13 attached to the cylinder 10 is released, and the nine gripping parts/
/lH and pushed backwards. If there were guide rollers 13, it would move backward smoothly because of the electric *ga inlay K pile, but as shown in Figure 7, the tower side pulley/$.

It is also a good idea to pull the electric wire E using a weight /j.

FIG. 9 shows a state in which the rod ioα is pushed out and the grasping portion l is advanced. Cylinder 10. Grasping part//.

The hydraulic hose to lff1 is a double line reciprocating oil passage, but the diagram shows it as a single line. FIG. 10 shows these hydraulic control circuits. //a and /2G are attached cylinders for gripping and releasing the gripping parts // and /2, respectively. The operation valves /G and /7 in FIG. 7 are shown with the same reference numerals in FIG. ,/J
G alternately releases and drives.

The operator grasps the handles of the operating valves 1 and 7 in FIG. 7.10 with both hands, and when they are pushed forward at the same time, the wires are gathered together, and when they are pushed back, the grasping part 12 is moved forward. Therefore, it is easy to operate both handles at once, or to automatically reciprocate by simple series control.

As the tensioning work of pulling the electric wire Et is progressed in this way, the tension on the electric wire E gradually increases. The tension is equal to the tensile driving force of the cylinder 10. The tensile driving force is obtained by multiplying the effective cross-sectional area of the cylinder IO by the oil pressure, so when the pressure indicated by the oil pressure gauge reaches a certain value, it means that the wire tension has reached the specified value. Therefore, I stopped the Kugusi work and went to the 11E station.
According to the requester's instructions, either cut it or connect it to the insulator chain G end without cutting it, and then remove the pulley device.

As explained above with reference to one embodiment, the wire tensioning method of the present invention mainly uses a wire pulling device mainly consisting of a fluid pressure cylinder and directly measures the wire tension using cylinder command pressure. It goes without saying that field engineers can make changes and applications to the tools and tools 11 without changing the gist of the features.

The mounting position of the fluid pressure cylinder is not limited to the insulator continuous light jllK, and may be attached to its attached member.
The mounting position may also be on the insulator chain side.

The form and usage of the cylinder are also based on the well-known techniques of mechanical designers.

This invention replaces quinches, which were the main role in power line tensioning work.
I changed to a fluid pressure cylinder for the first time.

This dramatically changed the extremely dangerous aerial work mentioned above into a safer one.

Additionally, we stopped using the visual tension measurement method, which cannot be used on rainy or foggy days, and instead decided to use a hydraulic pressure gauge to directly measure wire tension.

Since the electric wire is drawn directly by the cylinder without intervening pulleys, etc., the tension measurement value based on the indicated pressure is extremely high in proportion to the accuracy of the pressure gauge, and is accurate down to the smallest unit. The conventional tension calculations and tedious sag height measurements according to various conditions have been changed to just looking at the scale of the pressure needle.

The effects of this development can be summarized as follows.

(1) It is possible to accurately control the tension of the wire.

(2) Eliminates the need for the light and dangerous work of installing come-alongs during wire tensioning work. A major safety issue has been resolved.

(3) You can work without waiting even in rain or fog.

(4) The equipment is lightweight and simple, and can be used even in mountainous areas where there are no transportation facilities.

(5) Wire ropes are almost unnecessary, eliminating wire rope operations and accidents caused by them.

[Brief explanation of drawings]

Figure 1.2 is an explanatory diagram of the conventional power transmission line tensioning method, Figure 5 is an explanatory diagram of the conventional wire tension measurement method, and Figure 4 is an enlarged explanatory diagram of the insulator section of the conventional tensioning method using pulleys and wire ropes. , 5th
．． Figure 6 is a front view and cross-sectional view of the inner and outer cylinders of the come-along, Figure 7 is an explanatory diagram of an embodiment of the construction method of this invention, and Figures 8 and 9 are explanatory diagrams of an embodiment of the power transmission line tugging device of this invention, showing the cylinder rod. Conditions when retracted and extended, Figure 10 is 7.8
．． FIG. 9 is a circuit diagram of the fluid pressure control device of the embodiment shown in FIG. 9; IO...Fluid pressure cylinder, //', /ko...Electric wire grasping part. -5:

Claims (1)

[Claims] During tension work for power transmission lines that have been boarded up between steel towers, a wire tugging device using a fluid pressure cylinder is suspended near the tip of an insulator chain suspended from the steel tower, and the operating part of the said tugging device is suspended midway through the boarded up electric wires. (by engaging with and driving the corresponding tug device)
The wires in the tension section are successively pulled toward the insulator side, and when the indicated pressure of the fluid pressure cylinder reaches a value corresponding to the predetermined wire tension, the tug is stopped, and in this state, the wire conduit is 41. A power transmission line tensioning method that includes the step of removing the above-mentioned guide device after connecting to the above-mentioned insulator end.