JPH0548044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a low-tension stretching method for power transmission lines.

(Conventional technology) The conventional overhead power transmission line construction method is to attach a metal wheel to a steel tower and extend the wire by passing the wire through the metal wheel. In order to prevent this, the wires are stretched under high tension as the wires sag significantly. This construction method is called the so-called high-tension wire extension construction method.

When implementing this high-tension wire extension method, when the spacing between transmission line towers, that is, the span is long, the wires will hang significantly between the towers. If there is cultivated land, this will damage them, and in the mountains and fields it will damage trees, so they are cut down when necessary, but in either case special care is required and the strips are stretched with high tension. The wire must be extended so that it does not touch the objects below.

However, due to recent developments in large-capacity power transmission,
As the diameter of power transmission lines has become thicker, the weight of the wires has increased, and as a result, the tension that acts on the wires during wire extension has increased, so the machines and tools used in overhead line construction methods have also become larger and more powerful. At the same time, problems have arisen in the safety and workability of wire extension work.

For this reason, low-tension wire drawing methods have recently been studied. The conventional method for this low-tension wire extension method is to suspend multiple hanging wheels at intervals from a hanging wire stretched between steel towers, pass the wire through these hanging wheels, and then transport the wire. The connecting fitting on the wire clamp side and the connecting fitting device on the insulator side are pulled together and connected by a wire tensioning operation using a come-along tool.

Figure 1 is an explanatory diagram of the low-tension wire extension method. In the figure, 1 is a steel tower, 2 is a suspension wire stretched between the steel towers 1, and 3 is a large number of hangings suspended from this suspension wire 2 at appropriate intervals. It's a car.

To carry out wire extension and tensioning using the conventional construction method, as shown in FIG. A wire 7 such as a power transmission line connected to the wire 4 via a tension clamp 6 is extended through the hanging wheel 3, and then attached to the steel tower 1 by a cable 8 as shown in FIG. The connected come-along tool 9 is fixed to the filament 7, the filament 4 is removed, and the tension clamp 6 is pulled to connect it to the connecting fitting 10 connected to the steel tower 1 via an insulator link (not shown). Ta.

(Problems to be solved by the invention) As mentioned above, in the conventional construction method, after wire extension,
When connecting the tension clamp 6 and the connecting fitting 10, the come-along tool 9 is fixed to the wire 7. Since the work is carried out by leaning over the side, there is a risk that the worker may fall, which is dangerous, and there is also a problem that an accident may occur due to the fall of the come-along tool, etc.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a low-tension wire drawing method for power transmission lines that can be performed without using a come-along tool.

(Means for solving the problem) In order to achieve the above-mentioned object, in the present invention,
Multiple hanging wheels are suspended at intervals from hanging wires strung between steel towers, and the wires of the power transmission line are passed through each hanging wheel and extended, and the power transmission line is clamped during the wire tensioning work. In the low-tension wire extension construction method for overhead power transmission lines, which connects the side connector and the insulator side connector, both ends of a short round bar are formed into an almost hemispherical shape, and one end of the A tension clamp side connection hole is provided to connect with the tension clamp connected to the power transmission line, an insulator side connection hole is provided at the other end, and connecting bolts are installed around these tension clamp side connection holes and the insulator side connection hole. Using a main body of a connecting device for wire extension and tension wire, which is provided with a concave part into which the head and the nut can be inserted, and a wire connecting hole for connecting the tension wire connecting device is provided in the middle body of the round bar body, A tension clamp attached to the end of the wire of the power transmission line to be connected is connected through the tension clamp side connection hole of the connecting device body, and the insulator side connected to the wire of wire or rope, etc. The connecting fitting is connected to the insulator side connecting hole of the connecting fitting main body, and the wire connected through the connecting fitting main body is passed through a hanging wheel suspended from a hanging wire stretched between the steel towers, and the wire is pulled. The wire is extended, and a tension wire pulley device is used to pull the wire between one connection hole of the three-hole metal fitting connected to the insulator chain side and the tension wire connector connected to the tension wire connection hole of the connector main body. A connecting fitting device is inserted between the other connecting hole of the three-hole fitting and the connecting fitting on the insulator side from which the wire or rope has been removed, and then the connecting fitting device is connected. The equipment used in the work will be removed to complete the installation of the power transmission line.

(Function) Since the method of the present invention uses the main body of the connecting device for wire extension and tensioning configured as described above, the tension clamp is connected through the connecting hole on the tension clamp side of the connecting device main body. Then, connect the connecting fitting connected to the wire or rope through the insulator side connecting hole of the main body of the connecting device for wire extension and tensioning, and extend the wire while passing the wire or rope through the hanging wheel. can do. In addition, the wire tension connector can be attached to the wire tensioner through the wire tension connection hole in the body of the wire extension and wire tension connector main body.

Therefore, according to the present invention, the conventionally used come-along tool is no longer necessary, so the dangerous work of fixing the come-along tool to the wire is no longer necessary, and serious accidents due to the come-along tool falling can be prevented. This can be prevented.

In addition, around the tension clamp side connection hole and the insulator connection side connection hole of the main body of the wire extension and tension connection device used in the construction method of the present invention, a recessed portion into which the head of the connection bolt and nut can be inserted is provided. At the same time, the main body of the wire extension and wire tensioning connector is a short round rod, and both ends are approximately hemispherical, and there is no step part in the body, so it is difficult to extend the wire. Even if a protector is not used during wire installation, the wire extension/wire tension connector main body does not get caught in the groove of the hanging wheel, allowing smooth wire extension. In the case of the low-tension wire drawing method, the above effect is a great effect because the number of hanging wheels is large.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, the same reference numerals as the above-mentioned reference numerals indicate equivalent parts.

As shown in detail in FIG. 2, the main body 11 of the connecting device for wire extension and wire tension used in the construction method of the present invention is formed by forming both ends 12a and 12b of a short round bar body 12 into a substantially hemispherical shape. , a notch groove 12c in the axial direction
is formed into a clevis shape, a tension clamp side connection hole 13 is provided at one end to connect with the tension clamp 6 connected to the wire 7 of the power transmission line, and an insulator connection side connection hole 14 is provided at the other end, Recesses 17 into which the head 15a of the connecting bolt 15 and the nut 16 (see FIG. 2b) can be inserted are provided around the tension clamp side connecting hole 13 and the insulator side connecting hole 14, respectively, and the round rod The body 12 is constructed by providing a tension connecting hole 19 in the middle trunk portion thereof to connect the tension connecting device 18 (see FIGS. 6 and 7).

In the figure, 20 is a split pin, and 21 is a connecting fitting on the insulator chain side.

Next, an embodiment of the low-tension wire drawing method of the present invention using the wire drawing/tensioning connector main body 11 configured as described above will be described with reference to FIGS. 1 to 9.

First, in order to extend the wire, as shown in FIG. While moving in the direction of arrow A, as shown in FIGS. 3 and 4, the end of the filament 4 is connected to the insulator link of the connector main body 11 via the wire extension connector 22 and the connecting fitting 21 on the insulator link side. It is connected to the side connection hole 14 by a bolt 15 and a nut 16.

FIG. 4 shows the connected state, and the connecting bolts are omitted. In addition, Fig. 5 shows the wire extension connector 22.
In the figure, 22a is a pulley that locks the wire 4, 22b is a bolt that becomes the axis, and 22c is a pulley that locks the wire 4.
2 is a clevis portion for connecting with the connecting fitting 21;
2d is the connecting bolt.

Also, the tension clamp side connecting hole 1 of the connector body 11
3, the tension clamp 6 is connected to a wire 7 of a power transmission line, etc., as shown in FIG. 3, and the wire 4 is moved in the direction of arrow A as shown in FIG. Then, the wire 7 is passed through the hanging wheel 3 and is extended below the hanging wire 2.

Next, in order to perform the tensioning, as shown in FIGS.
The connection hole 18a provided at one end overlaps the tension connection hole 19 provided in the trunk of the connector main body 11, and
A bolt (not shown) is inserted and connected, and one working metal wheel 24a of the tension wire pulley device 24 shown in FIG. At the same time, the other working metal wheel 24b is connected to a three-hole metal fitting 25, a plurality of connecting metal fittings 26,
It is connected to the steel tower 1 (see FIG. 1) via an insulator link 27.

Then, the work metal wheel 2 is moved by the tension pulley device 24.
4a and 24b to tighten the wire, remove the wire extension connector 22 (see Figures 3 and 4) connected to the filament 4 from the connector 21, and connect the connector as shown in Figure 6. A connecting fitting device 28 is passed between the loose connecting holes of the three-hole fitting 21 and the three-hole fitting 25 to connect them.

After that, if the tension pulley device 24 is loosened and the distance between the working metal wheels 24a and 24b is extended, the connecting metal fitting 21
Since the connecting fitting device 28 becomes straight as shown in FIG. 8, if the tension line connecting fitting 18 and the tension line pulley device 24 are removed in this state, the state shown in FIG. 8 will be obtained. FIG. 9 shows a partial arrangement of the connector main body 11, the connector 21, and the connector device 28. As shown in FIG.

(Effects of the Invention) Since the construction method of the present invention uses the wire extension and tension connector main body 11 constructed as described above, The tension clamp 6 is connected, and the wire extension connector 22 connected to the filament 4 such as a wire or rope is connected through the insulator side connection hole 14 of the wire extension and tension connector main body 11. While passing the wire or rope through the hanging wheel 3, it is possible to extend the wire 7 for power transmission or the like connected to the tension clamp 6.
Further, the wire tensioning device 18 can be attached to the wire tensioning device 18 through the wire tensioning hole 19 in the trunk of the main body 11 of the wire extension/strengthening connector body 11.

Therefore, according to the present invention, the conventionally used come-along tool 9 is no longer necessary, so the dangerous work of fixing the come-along tool 9 to the wire 7 is no longer necessary, and the come-along tool 9 is prevented from falling. An excellent effect can be obtained in that serious accidents caused by accidents can be prevented.

In addition, the head 1 of the connecting bolt 15 is located around the tension clamp side connecting hole 13 and the insulator side connecting hole 14 of the wire extension and wire tensioning connector main body 11 used in the construction method of the present invention.
5a and a nut 16 can be inserted therein, and the main body 11 of the connecting device for wire extension and tensioning is provided.
is a short round bar body, and both ends are almost hemispherical, and since there is no part to form a stepped part on the body, when the wire is extended, it is not necessary to extend or tighten the wire into the groove of the hanging wheel 3. Smooth wire extension is possible without the connector main body 11 getting stuck. In the case of low tension wire extension method, hanging wheel 3
The above effect is a very large effect because of the large number of .

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the low-tension wire drawing method according to the present invention, Figure 2a is an elevational view of the main body of the connector used in the method of the present invention, Figure 2b is its plan cross-sectional view, and Figure 2c is the same. Figure a is a side view, Figure 3 is a partial view showing the linear connection part,
Figure 4 is a perspective view of the main parts, Figure 5a is an elevation view of the wire extension connector, Figure b is its plan view, Figure 6 is an explanatory diagram of the wire tensioning work, and Figure 7 is the part. 8a is a plan view showing the state when the overhead wire is completed; FIG. 8b is a partial elevational view thereof; FIG. 9 is a partial perspective view thereof;
The figure is an explanatory diagram of the case of wire stretching using the conventional low-tension wire drawing method, and FIG. 11 is an explanatory diagram of the wire tensioning work after wire stretching using the conventional method. 1... Steel tower, 2... Hanging wire, 3... Hanging wheel, 4...
... wires such as ropes or wires, 6 ... tension clamps, 7 ... wires such as power transmission lines, 9 ... come-along tools, 11 ... wire extension and tensioning connector main body (connector main body), 12...Round bar body, 12a, 12b...
... Both ends, 12c ... Notch groove, 13 ... Clamp side connection hole, 14 ... Insulator connection side connection hole, 15 ... Connection bolt, 15a ... Head, 16 ... Nut, 1
7... Recessed portion, 18... Strain connector, 19... Strain connection hole, 21... Connection fitting on the insulator chain side, 22...
...Line extension connector, 24...Tension line pulley device, 24
a, 24b... Working metal wheel, 25... Three-hole metal fitting, 26... Connection fitting, 27... Insulator chain, 28...
...Connection fitting device.

Claims (1)

[Claims] 1. Suspend multiple hanging wheels at intervals from hanging wires strung between steel towers, extend the wires of the power transmission line through each hanging wheel, and tighten the power transmission lines during the tensioning work of the wires. In the low-tension wire extension method for overhead transmission lines that connects the clamp-side connector and the insulator-side connector, both ends of a short round bar are formed into approximately hemispherical shapes, and one end A tension clamp side connection hole is provided at the other end to connect with the tension clamp connected to the power transmission line, an insulator connection hole is provided at the other end, and connections are made around these tension clamp side connection holes and the insulator connection hole. Provide a recess into which the bolt head and nut can fit,
A wire extension/tension line connector main body is provided with a tension line connection hole for connecting the tension line connector in the middle body of the round bar body, and is attached to the end of the wire of the power transmission line to be connected to the overhead line. Connect the tension-resistant clamps through the tension-resistant clamp-side connection holes of the connector main body, and connect the insulator-side connection fittings connected to the wires, ropes, etc. to the insulator-side connection holes of the connector main body. The wires connected via the connector body are passed through a hanging wheel suspended from a hanging wire stretched between the steel towers, and the wires are extended by being pulled. A tensioning pulley device pulls and tensions between one connection hole of the metal fitting and a tensioning connector connected to the tensioning connection hole of the connector main body, and connects the other of the three-hole metal fittings. A connecting fitting device is inserted and connected between the hole and the connecting fitting on the insulator side from which the wire or rope strips have been removed, and then the device used for the wire tensioning work is removed to complete the installation of the power transmission line. A low-tension wiring construction method for power transmission lines.