JPH0313804B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In overhead power transmission line work, the present invention provides a method for installing multiple electric wires across the sky between adjacent steel towers, and in case of unforeseen circumstances during the overhead line work. This is a device that prevents contact with lower structures, damage accidents, and damage to electric wires due to abnormal drooping.

Conventionally, methods have been adopted to protect lower structures during overhead line work, such as constructing protective scaffolding on both sides near the structure and erecting wire ropes in a net shape between them. However, in recent years, as the scale of power transmission line facilities has become larger and the number of crossing structures has become more diverse, protective scaffolding has tended to become larger and stronger.
Their installation has become extremely difficult in terms of economy, construction efficiency, social environment, and securing land for scaffolding. In addition, if the lower structure is a special high-voltage power transmission line, it becomes a large-scale protective scaffold, and since the protective device itself is made of conductive material, installation of the protective device requires a long power outage, and the protective device itself and the lower Adequate measures are also required to prevent accidents caused by contact with power transmission lines.

On the other hand, recently, as a device that does not require the construction of protective scaffolding, the hanging metal wheel method has been used, in which a wire is stretched between adjacent steel towers and the electric wire to be erected is hung from this wire with a metal wheel, but it is not necessary to construct a multi-conductor electric wire. In such cases, the above-mentioned wire becomes large in order to withstand the weight, and the labor involved in handling it increases, which reduces the efficiency of construction work.Also, in the case of crossing special high-voltage power lines, it is difficult to use the wire and the metal wheel device. Trouble during overhead line construction can directly lead to damage to the structures below, and is also expected to cause electric shock accidents for overhead line construction workers.

The present invention belongs to a device that does not construct a protective scaffold like the latter device, that is, it uses two adjacent steel towers that sandwich the structure, and between them two sets of upper and lower busbar ropes are stretched, and the lower multiple busbar ropes are used. A plurality of horizontal protection ropes are installed along the line length direction so as to connect each other horizontally, and further along the line length direction so as to connect vertically between the busbar ropes on the outside of each of the upper and lower parts. By installing a plurality of vertical protection ropes, a suspension bridge-like protection device is formed that surrounds all the multi-stranded electric wires during overhead line work, thereby protecting the structures below. This eliminates the need for protective scaffolding, and saves time and effort for constructing it and securing land. Furthermore, since all of the multi-strand electric wires are surrounded and protected, the overhead line work can be carried out using normal overhead line construction methods without the need for tensioning messenger wire, and therefore there is no reduction in the efficiency of the overhead line work. Furthermore, due to its structure, this protection device follows the horizontal deflection of the wire due to the wind, and detects abnormal drooping of the wire due to problems in the vertical direction. Just make sure you have space.

Furthermore, the present invention eliminates the use of conventional steel wire ropes, and instead constructs the bus rope, horizontal protection ropes, vertical protection ropes, etc., all of electrically insulating materials. As a result, if these ropes should break and fall, even if the underlying structure is electrical equipment, no electrical trouble will occur to it. Particularly in the case of extra-high power transmission lines, there is an advantage that in addition to power outage accidents, electric shock accidents to humans and animals will not occur. Furthermore, since electrical insulating materials are generally much lighter than steel materials, they make it easier to erect and remove protective equipment, and they also reduce the mechanical shock given to the structures below in the event of a disconnection/fall accident like the one mentioned above. , which has the advantage of not causing damage.

The present invention furthermore provides the following steps in order to facilitate the construction work of the above-mentioned suspension bridge-like protection device and to ensure the mechanical safety of this protection device during strong winds after erection.
The lower horizontal and upper and lower vertical protective ropes are respectively engaged with the upper and lower bus ropes in a movable relationship in the line length direction through rollers, and electrically insulated along each bus rope to operate this movement. By attaching an auxiliary rope and connecting it to the supporting frame of the roller in a fixed relationship, it is possible to easily deploy the horizontal and vertical protective ropes onto the busbar rope and store them on the tower side.

To explain one embodiment of the present invention with reference to the drawings,
In FIG. 1, A and B are two adjacent steel towers, and a portion of the power transmission line 4 that is about to be installed between them is already shown. Electric wire 1 strung between both utility poles 9 and 11 below power transmission line 4
0 exists as an existing lower structure, and this electric wire 1
0 is perpendicular or oblique to the power transmission line 4. The protection device according to the present invention is installed along the power transmission line 4 between the ground wire at the top of the power transmission line 4 and the existing electric wire 10 below.

Of the horizontal arms 5 and 6 in the three upper and lower stages that support the three-phase, three-wire, two-circuit power transmission lines on the towers A and B, protective horizontal arms 12 and 13, which are slightly longer than the lowermost arms 5 and 6, are installed on the towers A and B, respectively. ,B are fixedly installed.
Both horizontal arms 12 and 13 are installed in directions facing each other, and four lower busbar ropes 14 are stretched in parallel between them with appropriate spacing between them. A horizontal protection rope 16 connects these busbar ropes laterally.
are installed at appropriate intervals along the length direction of each bus rope 14, and a roller tool 20 is provided at each intersection of the plurality of bus ropes 14 and the plurality of horizontal protection ropes 16. . The rollers built into each roller tool 20 are in a relationship of rolling in contact with each bus rope 14, and the frame supporting this roller is the protective rope 1.
6 in a locking relationship. Further, a lower auxiliary rope 18 is provided along each generatrix rope 14 so as to be movable in the longitudinal direction thereof, and this rope is also coupled in a locking relationship to the roller support frame at a corresponding position. Although omitted in the drawing, the auxiliary rope 18 is attached to the steel tower A.
and B, one half of which is shown in the drawings, and both ends of this half are connected to each other as shown in the drawings immediately before the completion of the erection operation. is fixed to the horizontal arms 12, 13 of.

Two upper busbar ropes 15 are installed between the steel towers A and B, with both ends of the uppermost horizontal arms 7 and 8 installed on the steel towers A and B facing each other as connection points. Note that these horizontal arms 7, 8 and the horizontal arms 12, 13 are set to have approximately the same length.
Upper auxiliary rope 19 along upper busbar rope 15
The length and condition of this auxiliary rope 19 are the same as those of the lower auxiliary rope 18 described above. Both upper bus ropes 15 are also provided with a plurality of roller tools 20 in the same manner as described above, and these are arranged at positions corresponding to the upper and lower positions of the roller tools 20 provided on the two outer bus ropes 14 of the lower row. ,
A vertical protective rope 17 connecting the upper and lower roller tools 20 is provided between them. The support frames of these roller tools are locked to corresponding positions on the auxiliary rope 18, and the upper and lower ends of the vertical protection rope 17 are locked to the support frames of the upper and lower roller tools 20, respectively. The number of lower horizontal protection ropes 16 is greater than the number of vertical protection ropes 17, and there is one horizontal protection rope without a vertical protection rope between the horizontal protection ropes with vertical protection ropes attached to both ends.
One or more are provided, and the density of the lower protection is increased, and the density of the side protection is lowered for simplicity.

2 and 3 show the mutual relationship between the upper and lower roller tools 20 and their associated ropes, respectively. In FIG. 2, the roller device 20 incorporates several horizontal rollers 21 and vertical rollers 22 each rolling in contact with the upper busbar rope 15 passing through its central hole, these rollers covering all four circumferences of its entire circumference. It is supported by a frame body 23 surrounding it. Although the detailed structure of the frame body 23 is omitted in the drawing,
A vertical roller 22 on either the left or right side is configured to rotate around its upper end to open the enclosure of the central hole. Therefore, the bus rope 15 can be inserted into and removed from the central hole of the roller frame 23 by opening and closing one side of the enclosure. An upper hanger 24 and a lower hanger 25 are fixedly protruded from the upper surface of the frame 23 and from the lower surface, respectively. A corresponding portion of the upper auxiliary rope 19 is secured to one hole of the lower suspender 25, and the upper end of the vertical protective rope 17 is secured to the other hole through a ring.

In FIG. 3, a roller tool 20 has exactly the same structure as the roller tool 20 in FIG. 2, and the lower busbar rope 14 is inserted through its central hole. The lower end of the vertical protective rope 17 is locked to the upper hanging tool 24 via a ring, the corresponding part of the lower auxiliary rope 18 is secured to one hole of the lower hanging tool 25, and one end of the horizontal protective rope 16 is secured to the other hole. Both are locked through rings. FIG. 3 shows a roller tool 20 associated with the outer lower busbar rope 14 in FIG.
and related ropes, but regarding the inner lower busbar rope 14, the upper hanging tool 24 is shown in FIG.
There is no vertical protective rope 17 latched to the vertical protective rope 17; instead, one end of another horizontal protective rope section 16 is in a latched relationship via a ring to the remaining one hole of the lower sling 25.

All ropes 14-19, such as busbar ropes, are made of electrically insulating material and are therefore generally light in weight compared to conventional steel. Further, it is desirable that these ropes have as high mechanical strength, durability, weather resistance, etc. as possible in view of the usage mode of the present invention. An example of a rope that uses a material that satisfies these conditions is a so-called Kevlar rope that uses special high-strength organic fibers. In addition to having electrical insulation properties, this wire rope has approximately the same mechanical breaking strength as conventional wire ropes of approximately the same diameter, and is less than 1/3 the weight.

To explain the order of installation work of the protection device according to the present invention shown in FIG. 1, first, the adjacent steel towers A and B
After installing the horizontal arms 12 and 13, four lower auxiliary ropes 18 are extended between these horizontal arms. To do this, a nylon rope for wire extension is extended from the helicopter between the horizontal arms 12 and 13,
After tying each tip of the four auxiliary ropes 18 prepared in advance on the steel tower A side to the wire extension rope, the four wire ropes are wound up on the steel tower B side to form four ropes between the horizontal arms 12 and 13. The auxiliary rope 18 is extended and installed. Each auxiliary rope 18 is connected to the steel tower A, as described above.
Since the length is a little more than twice the distance between B and B, when the tip of the auxiliary rope 18 reaches the horizontal arm 13, the end of the first half of the auxiliary rope 18 is on the horizontal arm 12, and the second half follows. Therefore, the starting points of the four bus ropes 14 are tied to each of the starting points of the latter half on the tower A side, and each of the auxiliary ropes 18 is then wound on a tension reel on the tower B side. 14 and the starting end of the second half of the auxiliary rope reach the horizontal arm 13, and the terminal end reaches the horizontal arm 12. Therefore, by tightening each bus rope 14 and fixing its starting and ending ends to the horizontal arms 13 and 12, respectively, these ropes will be in the state shown in Figure 1, and each auxiliary rope 18 will have its front half on the tower B side. The wire is wound onto a reel and extended between the horizontal arms 12 and 13 with the latter half generally following each busbar rope 14.

Construction work for constructing the upper busbar rope 15 and the upper auxiliary rope 19 between the uppermost horizontal arms 7 and 8 of the steel towers A and B is carried out in the same manner as in the case of the lower stage. However, in the lower stage, there were four bus ropes 14 and four auxiliary ropes 16 each, but in the upper stage, there were only two each.

Next, work begins on attaching the horizontal protection rope 16 on the lower tier and the vertical protection rope 17 between the upper and lower tiers. To do this, first, on the side of the steel tower B, a roller tool 20 as shown in FIG. Hanging tool 25
The upper end of the vertical protective rope 17 is locked to the upper hanging tool 24 of the roller tool 20 at the lower stage, and the lower end of the vertical protective rope 17 is locked to the lower hanging tool 25.
Both ends of each section of horizontal protection rope 16 are secured to. In addition, the auxiliary rope 1 is attached to the lower suspension tool 25 for both the upper and lower tiers.
8 and 19 are locked. Next, wind up all the auxiliary ropes 18 and 19 on the steel tower A side and
When sent out on the side, the first vertical protection rope 17 (a-
1) and the horizontal protection rope 16 (b-1) are connected from tower B to tower A along the upper and lower busbar ropes 15 and 14.
move towards. When the distance of this movement reaches the planned length, the movement is stopped and the next protective rope 17 is moved.
The same operation as above is performed for (a-2) and 16 (b-2). That is, each of the second roller tools 20 is engaged with the busbar ropes 15, 14, and each of the protective ropes 17, 16 and each of the auxiliary ropes 19,
After locking 18, all the auxiliary ropes are simultaneously moved toward the tower A by a predetermined length. The same operation is repeated, and finally the required number of sets of protection ropes 17 (a-n) and 16 (b-n) are attached to the steel tower B.
The series of operations ends when it is sent out from the side horizontal arms 8 and 13. The protective ropes 17 (a-1), (a-2), (a-n) and 16 (b-1), (b-2), (b-n) at the time of completion are shown in Figure 1. respectively a-1, a-2, a-n, b-1, b-2,
Displayed as bn. Then each auxiliary rope 1
9 and 18 are strung between the steel towers A and B and their ends are fixed to the horizontal arms 7, 8, 12, and 13, a suspension bridge-like protection device as shown is completed.

As a measure against strong winds, each protective rope 17,1
6. First, the horizontal arms 12, 1 of each auxiliary rope 18, 19 are recovered.
After releasing the fixation to the auxiliary ropes 3, 7, and 8, each half of these auxiliary ropes that had been wound up on the tower A side is let out, and the protection rope 1 is wound up on the tower B side.
6 and 17 to the tower B side. Therefore, first, when the protective ropes 17 (a-n) and 16 (b-n) reach the horizontal arms 8 and 13, respectively, the roller tools 20 associated therewith are removed from the busbar ropes 15 and 14, and the hanging tools 25 are removed. By releasing the auxiliary ropes 19 and 18, these roller tools 20 and the protective ropes 17 (a-n) and 16 (b-n) attached to them are removed.
Collect. Next, the auxiliary ropes 19, 18 are further pulled toward the horizontal arms 8, 13 by a predetermined length, and when the next protective ropes 17, 16 reach the horizontal arms 8, 13, the same operation as above is performed to remove them. Remove and recover the protective rope and related roller equipment. Thereafter, similar operations are repeated to complete the collection of the last protective ropes 17 (a-1), 16 (b-1) and related roller tools 20. In addition, in the above, it is also possible to collect only the vertical and horizontal protective ropes and leave the roller equipment in consideration of re-deployment.
Further, all the vertical and horizontal protection ropes may be bundled and tied tightly between the arms 8-13 and to the arm 13, respectively. The last protective rope 1 during the above recovery operation
When 7(a-1) and 16(b-1) advance considerably towards the steel tower B, these ropes and the horizontal arm 7,
In order to prevent the auxiliary ropes 19, 18 between the auxiliary ropes 19 and 12 from becoming inconvenient due to large slack, roller tools 20 are attached to the busbar ropes 15 and 14 at appropriate intervals for the auxiliary ropes between them.
By inserting the auxiliary rope and locking the corresponding part of the auxiliary rope therein, the drooping of the auxiliary rope can be restricted.

Describing the procedure for removing the above-mentioned protection devices after the overhead wiring work for all the electric lines between towers A and B is completed, first, all the protection ropes 16, 17 and related rollers should be removed in accordance with the above-mentioned procedure for measures against strong winds. After collecting the tool 20, each of the auxiliary ropes 18 and 19 is wound up between the steel towers A and B to the steel tower B side and collected. Next, to recover each bus rope 14, 15, release the fixation from the steel towers A and B, and connect one wire extension rope to each two of the released bus rope ropes on the steel tower B side. Each bus rope is let out from the tower B side, and wound and collected on the tower A side. Finally, the line extension rope is recovered on the ground (if it does not fall to the ground, it is recovered by a helicopter, etc.), and the horizontal arms 12 and 13 of the steel towers A and B are removed to complete the removal work.

According to the present invention, a protective rope network is directly erected between the two already completed towers in the construction of multi-wire overhead lines between adjacent steel towers, so the construction is more efficient than the method of constructing protective scaffolding in the middle. There is no need to secure the scaffolding site required for construction, which saves construction time and costs.In addition, by installing vertical protection ropes in addition to horizontal protection ropes between both towers, creating a suspension bridge-like protection device, it is possible to reduce construction costs during overhead line construction. The wire is wrapped in a protective device that follows the wire's lateral deflection, suppresses the amount of drooping in the event of abnormal wire drooping during construction, and reliably prevents damage to the structure below or the wire itself. General overhead wire construction methods can be used as they are without changing the overhead wire construction method, such as the hanging wheel construction method that was previously used. In addition, by constructing all the ropes of the suspension bridge-like protection net with electrically insulating material, even if the structure below is an electrical structure such as an overhead power line, it is possible to prevent power outages during the installation and removal of this protection device. Even if a part of the protective device comes into contact with the underlying structure during installation or removal, there will be no electrical or mechanical damage such as electric shock or damage. Therefore, installation and removal of the protective device is easy. Furthermore, by providing an auxiliary rope and a roller device that are movable in the line length direction in relation to the busbar rope, it is possible to simplify the assembly work of the protection device, and to avoid damage to the protection device during strong winds, etc. This has the advantage that horizontal and vertical protection ropes can be easily retrieved at any time and then redeployed.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a protection device according to the present invention;
2 and 3 are perspective views of two partial elements in FIG. 1; FIG. 4: Multi-strand electric wire, 7, 8: Top horizontal arm, 1
0: Lower structure, 12, 13: Horizontal arm, 1
4: Lower bus rope, 15: Upper bus rope, 1
6: Horizontal protection rope, 17: Vertical protection rope, 1
8: Lower auxiliary rope, 19: Upper auxiliary rope, 2
0: Roller tool, 21, 22: Roller, 23:
roller frame.

Claims (1)

[Claims] 1. When installing multiple electric wires across the sky above the structure between adjacent steel towers A and B, each horizontal arm should be placed under the lowest arm installed on each tower A and B so that they are facing each other. A plurality of electrically insulating lower busbar ropes are installed between towers A and B, using both ends of each horizontal arm and several intermediate points between them as connection points, and the ropes are connected to towers A and B. Two electrically insulating upper busbar ropes are installed between towers A and B with both ends of the uppermost horizontal arms installed facing each other as connection points, and the ropes are installed along the lower and upper busbar ropes. In addition, an electrically insulating auxiliary rope that is movable in the line length direction and has a length more than twice the distance between towers A and B is provided, and rollers that roll in contact with the lower and upper busbar ropes are provided. A plurality of roller tools with built-in cables are provided along the length direction of each bus rope, and these roller tools are placed at a position that maintains an appropriate distance from each other, and each roller frame is connected to one of the corresponding auxiliary ropes. A plurality of electrically insulating horizontal protective ropes are provided at appropriate intervals along the length of the line that connects the lower busbar ropes horizontally. A plurality of electric wires are connected to each of the corresponding roller frames at the intersection points with the bus ropes, and vertically connect both bus ropes on the upper stage and the two outside bus ropes on the lower stage, respectively, along the length direction of the wires. By providing insulating vertical protection ropes and locking their upper and lower ends to each respective said roller frame, and thus securing both ends of said half of each auxiliary rope to each corresponding horizontal arm, each of the upper and lower tiers is secured. Transmission line overhead line construction work that prevents contact between the multiple electric wires above and structures below using a suspension bridge-like protection device consisting of multiple busbar ropes, multiple horizontal protection ropes on the lower tier, and multiple vertical protection ropes between the upper and lower tiers. Lower structure protection device.