JPS6315804B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an erection method suitable for prefabricated electric wires.

As a method of installing prefabricated electric wires that have been cut in advance to fit the span of supports such as steel towers, a method of installing a pulley on the support and placing the prefabricated electric wire on it and extending the wire, or a method of stretching a guide cable between the supports. The most commonly used method is to extend the wire by moving a hanger fitted with prefabricated wire along the guide cable. In the former method, a protective tube is placed over the tension clamps, etc. installed at both ends of the prefabricated wire to prevent it from derailing when the wire passes through the pulley, so as the diameter of the prefabricated wire becomes larger, the It is necessary to use a large pulley, and it has the disadvantage that only straight bar-shaped tension clamps can be used. Also, when connecting prefabricated wires in series in the span to be extended, the necessary tension cannot be applied. In addition, the slackness of the prefabricated wires in each span must be maintained within an allowable range, and for this purpose, the tension maintaining operation must be repeated each time each prefabricated wire is drawn into the construction section, which is cumbersome. In the latter construction method, a large number of hangers are placed in each span, so it takes a lot of effort to install and remove them, and the work of recovering the wire after the wire has been extended is troublesome.

In the present invention, two guide cables are arranged in parallel over the construction section and installed on a support, and an endless towing cable is arranged between these guide cables, and the electric wire is attached to a wire extension hanger having wheels on the left and right. The electric wire is fixed at each span length, and the tow cable is fixed, and the wheels are placed on the two guide cables, and the tow cable is pulled and the wire extension hanger is run along the guide cable, and the electric wire is attached to the guide cable. By extending the wire to a predetermined position between the prefabricated wires, the wire can be run stably and the tension can be easily maintained at a constant level. be.

The embodiments of the present invention will be described below with reference to the drawings. Each span 4 of the supports 3A, 3B, 3C
The planned length of the electric wire to be installed in AB and 4BC is determined by calculation or actual measurement, and the prefabricated electric wire 1 is made by cutting it to the installation length of each span 4AB and 4BC.
Wrap this around drum 2.

As a first step, as shown in FIGS. 1 and 2, the guide cables 6a, 6b and the traction cable 7 are extended over the entire span. The guide cables 6a, 6b are parallel to each other and have arms 5A, 5B, 5 protruding from the respective supports 3A, 3B, 3C.
Two pieces are supported at each end of C, and supports 8 as shown in FIGS. 6 and 7 are used for this purpose. This support 8 includes two guide ropes 6a,
A front-shaped main body 12 is provided with side arc-shaped receiving members 10, 10 on the left and right sides having an upward groove 9 into which the 6b is partially fitted, and is suspended and fixed to the arms 5A, 5B, 5C by a mounting member 11 at the center; The guide member 1 extends downwardly and inwardly from the lower left and right ends of the guide member 1.
3, 13 and a guide ring 14 pivotally supported at the lower end thereof.
It is composed of: First, the guide cables 6a, 6b are fitted to the receiving members 10, 10 of such a support 8 on the ground, and the tow cable 7 is engaged with the guide ring 14, and then the support 8 is connected to the supports 3A, 3.
By lifting along lines B and 3C and hanging from both ends of arms 5A, 5B, and 5C, both ends of guide cables 6a and 6b are tilted forward and backward from supports 3A and 3C at both ends, and fixed to the ground. Erect it under appropriate tension. The traction cable 7 is formed endless after engaging each guide ring 14, and is connected to supports 3A and 3C at both ends.
It is constructed under appropriate tension by wrapping it around a drive shaft 17 connected to a movable motor 16 and reversing wheels 15 with variable positions for tension adjustment installed on the ground at the front and rear of the vehicle.

As a second step, preparation work for the wire extension of the electric wire 1 is performed, in which wire extension hangers 18 are attached to both ends of the electric wire 1 fed out from the drum 2, and auxiliary hangers 19 are attached to the vicinity thereof. Attach the support hanger 20.

In the illustrated embodiment, the second step is performed in parallel with the wire stretching work of the electric wire 1 performed as the third step. As shown in FIGS. 8 and 9, the wire extension hanger 18 includes a main body 22 equipped with wheels 21, 21 on the left and right sides that rotate on two guide ropes 6a, 6b, and a main body 22 provided on the upper center surface of the main body 22, and a traction wheel provided on the upper center surface of the main body 22. Connecting member 2 that fixes the cable 7
3 and a mounting member 24 provided on the central lower surface of the main body 22 and fixing the electric wire 1, and the auxiliary hanger 19 also includes a wire extension hanger 18, as can be seen from FIG.
It has a similar structure. Wire 1 from drum 2
Slightly let out the wheels 21 and 2 to guide cables 6a and 6b.
The tension clamp 1a at the tip of the electric wire 1 is fixed to the attachment member 24 of the wire extension hanger 18 on which the wire extension cable 1 is placed, using a rope-like attachment 25, and the towing cable 7 is overlapped on the upper surface of the main body 22 and connected to the connecting member. 23 and press down to secure it (see Figure 9). In addition, the wire extension hanger 18
An auxiliary hanger 19 is placed near the main body 26.
The left and right wheels 27, 27 are placed on the guide ropes 6a, 6b, and the tow rope 7 is fixed with the same connecting member 28 as the wire extension hanger 18, and the tension clamp 1a is attached to the mounting member 29 from the mounting tool 25. Fix it using a slightly longer fixture 30. In this case, the support 8
The distance l2 between the guide cables 6a, 6b and the electric wire 1 in the auxiliary hanger 19 is made smaller than the distance _l1 between the guide ropes 6a, 6b and the electric wire ₁ in (see FIG. 13). This allows the wire extension hanger 18 and the auxiliary hanger 19 to pass through the support 18 as shown in FIG. Next, the prime mover 16 is operated to move the endless towing line 7 in a counterclockwise direction in FIG. Spans 4AB and 4BC are maintained at the end of the line.
so that it is installed with a predetermined slack.

When the electric wire 1 installed in the frontmost span 4BC is fed out from the drum 2, the connecting wire 32 attached between the tension clamps and the next electric wire 1 is extended without stopping or stopping the prime mover 16. Wire hanger 1
At the same time, the front and rear tension clamps 1a and 1a are fixed to the mounting member 29 of the auxiliary hanger 19, and the tow rope 7 is fixed by the connecting member 28 to continue the wire extension work (No. 3,13
figure). When the last electric wire 1 is paid out from the drum 2, the wire extension hanger 18 and the auxiliary hanger 19 are attached to the tension clamp 1a at the rear end, and the tension wire 33 connected in advance to the rear of the electric wire 1 is tensioned. The wire is drawn through the device 31 while maintaining a specified tension (Fig. 4), and each wire drawing hanger 18 is attached to a predetermined support 3.
When reaching A, 3B, and 3C, the prime mover 16 is stopped (FIG. 5).

As the fourth step, the wire 1 is held and constructed, and the tension clamps 1a and the like are removed from the wire extension hanger 18 and the auxiliary hanger 19 to adjust the slack, and the support 3
Each arm 5A, 5B, 5C of A, 3B, 3C is held in place by an insulator chain or other holding member, and a jumper wire is attached to complete the installation of the electric wire in each span 4AB, 4BC.

In this way, when the installation of the electric wire 1 on one side of the supports 3A, 3B, and 3C in the direction shown by the arrow in FIG. Wire 1 on the opposite side in the direction
Erection will be carried out. In this case, the wires may be simultaneously extended and constructed in the direction of the arrow.

As a fifth step, the wire extension hanger 18 and the auxiliary hanger 19 are recovered, and the guide cables 6a, 6b, the traction cable 7, and the support 8 are removed. Move the tow rope 7 and lower the wire extension hanger 18 and auxiliary hanger 19 to the ground to remove the tow rope 7 and guide cables 6a, 6b.
In addition, the support 8 is removed from the supports 3A, 3B, and 3C, and the guide cables 6a, 6b, and the tow cable 7 are lowered to the ground.

Note that a support hanger 20 is used in the illustrated embodiment. As shown in FIG.
4 and 34 on the left and right, and a connecting member 36 for the traction rope 7 is provided on the upper center surface of the main body 35, and supports the traction rope 7 at a suitable position in the middle of the wire extension hanger 18, but it is not used. There is no problem. Although the auxiliary hanger 19 can also be omitted, the wire extension hanger 1 is designed to safely and stably extend the wire 1.
8 may be attached in two or more places. Furthermore, when extending two or more electric wires 1 at the same time, use the mounting member 2.
A wire extending hanger 18 and an auxiliary hanger 19 each having a plurality of wire extension hangers 4 and 29 in the left and right direction of the main bodies 22 and 26 are used.

In addition, prior to the third process of wire extension work, the electric wire 1
When carrying out the second step of attaching wire extension hangers 18 to both ends of the wire and fixing the traction cable 7 to the wire extension hangers 18, particular tension is applied to the electric wire 1 since the traction cable 7 moves under tension. There's no need.

As described above, in the present invention, two guide ropes are arranged in parallel over a predetermined section of the electric wire, and the two guide ropes are installed and fixed on a support, and the electric wire is placed over a span of a wire hanging hanger having wheels on the left and right sides. The wire is fixed at each length of construction, the tow rope is fixed to this wire extension hanger, wheels are placed on the guide rope, the tow rope is pulled, and the wire extension hanger runs along the guide rope. By moving the tow cable between two guide cables, not only can the cable run stably without worrying about derailment, but the cable can also be prefabricated by fixing both ends of the cable close to the wire extension hanger. In this case, it is possible to extend the tension clamp without contacting the guide rope support or other equipment, eliminating the need for a protective tube as in conventional construction methods, and therefore allowing the use of tension clamps of various structures and shapes. becomes possible. According to the present invention, since the tow cable is endless, the necessary tension is applied to the wire fixed to the tow cable via the wire extension hanger, and the wire is extended while maintaining the slack within the permissible range. At the same time, each wire extension hanger can arrive at a predetermined support at the same time, and as a result, there is no need to apply tension that acts as a braking force, and the tow rope can be driven with a small amount of power, and the tow rope can run in a tensioned state. Therefore, the tension of the wire can be easily maintained constant, and the wire can be fastened to the support accurately and easily.

In addition, because the tow rope is endless, when two guide ropes are installed on each side of the support and electric wires are installed on the left and right sides as shown in the figure, the work can be carried out continuously or simultaneously. This brings about the advantage of improved efficiency. Further, according to the present invention, since the wire extension work can be performed by placing only the guide rope and the towing rope between the spans of the supports, preparation for the wire extension and removal after the work can be carried out safely and easily. It is.

[Brief explanation of the drawing]

1 is a plan view of FIG. 2; FIGS. 2, 3, 4, and 5 are process explanatory diagrams showing embodiments of the present invention; FIG. 6 is a front view of the support; The figure is Figure 6
- A sectional view taken along the X-line, FIG. 8 is a front view of the wire extension hanger, FIG. 9 is a sectional view taken along the Y-Y line in FIG. FIG. 12 is a front view of the support hanger, FIG. 12 is a front view of the wire extending hanger passing through the support, and FIG. 13 is a partial side view showing the wire extending state. 1... Electric wire, 3A, 3B, 3C... Support, 4
AB, 4BC... span, 6a, 6b... guide cable,
7... Traction cable, 8... Support, 16... Prime mover,
18... Hanger for wire extension, 19... Auxiliary hanger, 2
0...Support hanger, 21...Wheel, 23...Connection member, 24...Mounting member.

Claims (1)

[Claims] 1. Two guide ropes are arranged in parallel over a predetermined section of the electric wire, and are installed and fixed to a support, and an endless tow rope is arranged between these guide ropes, and has wheels on the left and right sides. The electric wire is fixed to the hanger for each span length, the tow rope is fixed, wheels are placed on the guide rope, and the wire is guided by pulling the tow rope and running the wire extension hanger along the guide rope. A method for constructing overhead electric wires, characterized in that the wire is extended between cables, and each hanger for wire extension stops when it reaches a predetermined support to hold the wire to the support.