JP5812325B2 - Electric wire tension reduction device and electric wire tension reduction method - Google Patents

Description

  The present invention relates to an apparatus and a method for reducing the tension of a power transmission line opposite to the power transmission line when the power transmission line is replaced.

  Conventionally, a four-conductor transmission line has been used for an ultra-high-voltage line, but the damage of an electric wire has progressed in places where conditions are severe such as nature, and depending on the line, it is necessary to replace the line. When selecting the extension section in the cable replacement work, it is ideal to match the extension boundary at the time of construction. However, due to changes in land conditions such as the development of residential land after construction, engine stations and drums at the time of construction If the field cannot be used, the steel tower that does not take into account the wire retention must be used as the extension boundary steel tower.

  Such a steel tower that does not take into account the wire retention is an unaveraged when one of the four wires is disconnected, as defined in Article 124, Paragraph 2 of the Electrical Equipment Technical Standard. Designed to withstand tension.

  Specifically, in the case of the most standard vertically arranged two-line steel tower, as shown schematically in FIG. 11, the brace 11 of the steel tower 10 in one of the upper, middle, and lower phases in each line. Assuming that the tension by the upstream four wires W acting via the tension insulator 12 is Ta and the tension by the four downstream wires W is Tb, Ta≈Tb in normal times ( 11A), when two of the four wires W are cut and the downstream tension Tb ′ = 1/2 · Tb, the upstream tension Tc = Ta−Tb. The tower 10 is designed to withstand '(see FIG. 11B).

  Therefore, when constructing a wire replacement work using a steel tower that does not take into account wire retention as a cable-boundary steel tower, the four existing wires cannot be removed at the same time. It is necessary to construct by a method that satisfies these conditions. As a construction method that satisfies such conditions, an arm metal temporary holding method using an existing electric wire or a drawing method using a branch line is adopted.

  As shown schematically in FIG. 12A, for example, assuming that the downstream one-phase four-wire electric wire W is replaced, the arm metal temporary anchoring method using the existing electric wire is attached to the arm metal 11 with the retaining metal fitting. 100 is fixed, and the two wires W to be replaced are transferred to the retainer 100, and the downstream tension Tb ″ ≈½ · Tb is shared, and the upstream tension Tc≈Ta−Tb ″. It is intended to support.

  On the other hand, as shown schematically in FIG. 12 (b), the anchoring method using branch lines fixes the anchor metal fitting 100 to the arm 11 and connects the anchor wire 101 anchored to the ground on the tension wire side to the anchor metal 100. Then, the tension Tb ″ ≈1 / 2 · Tb for the two strips is shared via the branch line 101 to support the upstream tension Tc≈Ta−Tb ″.

  However, in the former construction method, the continuous tension for two strips (temperature of 15 to 20 ° C., tension per strip at the time of tangential line of wind speed of 0 to 15 m / s, based on about 60% of the maximum tension. In other words, when the maximum tension is 50 kN, it is necessary to manufacture a retaining bracket that supports about 60 kN at 60% of the two strips) and attach it to the armrest, and it takes several days for the bracket mounting work and the wire retaining work. The number of days to stop charging is required. In addition, it is necessary to extend the Kevlar rope etc., which will be the bus, to the extension section because it is not possible to use the existing wire as the bus at the important crossing point where the suspension car construction method needs to be applied, which further increases the number of days of charge stoppage .

  On the other hand, in the latter method, on the construction side, it is necessary to produce a retaining metal fitting that supports a constant tension (about 60 kN) for two strips, and to attach it to a brace. It takes several days to stop charging. Moreover, in order to install the concrete block for branch line retention, a great effort is required. Furthermore, the vertical load acting on the armrests of the steel tower increases due to the branch line retention, and reinforcement is necessary to compensate for the lack of strength of the armrests. In addition, on the site, it is necessary to borrow a wide range of construction sites and to cut down the forest in order to install the branch line retaining concrete blocks.

  The present invention has been made in view of such a problem, and in order to be able to remove and replace the four wires to be replaced simultaneously while satisfying the design conditions of the tower, An object of the present invention is to provide an electric wire tension reducing device and an electric wire tension reducing method capable of reducing the tension to the equivalent of two broken wires by simultaneously loosening four wires on the side opposite to the tensioned wires at the time of replacement.

  In the wire tension reducing device of the present invention, four wires are connected to a tension insulator provided on each arm of a steel tower via a connecting yoke fitting and a retaining clamp, and the four wires and the arm that are to be replaced are connected. Is a wire tension reduction device that reduces the tension of the four wires on the opposite side to the equivalent of a two-wire breakage, with a ground-side semi pulley connected to the connecting yoke bracket via a pair of mounting wires, Line side semi pulley with traction wire wound around side semi pulley and one end of which is fixed, and top balancer gold wheel and ground side balancer connected to line side semi pulley via triangular link. Cam Along attached to the gold wheel and the 4 wires, respectively, and connected to the base wire wound around the top balancer gold wheel and the base wire wound around the ground balancer gold wheel, respectively. When It consists of connecting clamps connected between each clamping clamp and connecting yoke fittings, and it is characterized by driving the winch of the pulling wire installed on the ground and feeding the connecting fittings into the span to increase the slackness of the wires To do.

  According to the present invention, the traction wire is connected between the ground side semi pulley and the ground side semi pulley, which are respectively attached to the four wires and connected between the cam along and the connecting yoke fitting via the pair of mounting wires. Is wound around the line-side semi pulley, the top-side balancer gold wheel, the ground-side balancer gold wheel, and the top-side balancer gold wheel connected to the line-side semi-pulley via a triangular link. It is connected by the turned mounting wire and the mounting wire wound around the ground balancer gold wheel. As a result, the winch installed on the ground is driven, and the pulling wire is wound up via the arm bracket and the steel tower, so that the four wires are drawn together via the cam along and the wire between the cam along and the holding clamp is drawn. By loosening, it is possible to release the connection between the retention clamp and the connecting yoke fitting, and the connecting fitting can be connected therebetween. Next, when the winch is driven to draw out the pulling wire, the four wires can be fed into the span at a time and the wire tension can be applied to the connecting fitting.

  Thereby, the slackness of the electric wire is increased by the length of the connection fitting fed into the span, and the electric wire tension can be reduced. In this case, the length of the connecting metal fitting is set in advance based on the type of electric wire, the span of the span, and the like so that the tension can be reduced to the equivalent of two wire breaks.

  As a result, it is possible to reduce the tension smoothly by loosening the four strips of wires while balancing them all together, so that it is excellent in economy and shortening the construction period compared to the conventional construction method. That is, as compared with the conventional arm metal temporary anchoring method using existing electric wires, the number of days of charge stoppage accompanying the preparation work is not required, and the construction period can be greatly shortened and the cost can be greatly reduced. In addition, branch lines are not required compared to the branch line method, so there is no need for land acquisition and compensation costs, which can greatly reduce costs and reduce forest logging as much as possible. it can.

  In the present invention, it is preferable that the connection fitting is formed of a plurality of pairs of link plates that sandwich a plurality of links and front and rear of each link and are rotatably connected to each other via pins. As a result, the number of links and link plate pairs can be adjusted to easily loosen the wires by a required length so that the tension of the four wires is reduced to the equivalent of the two-wire breakage calculated in advance.

In the present invention, it is preferable to provide a tensiometer to one of the connecting fitting even without low. Thereby, it can grasp | ascertain that the electric wire tension acted on the connection metal fitting, and the tension.

In the present invention, it is preferable that the earth side semi pulley and the line side semi pulley each support a plurality of sheaves rotatably. Thereby, the tension | tensile_strength of the tow wire wound between the line side semi pulley and the earth side semi pulley can be made small, and it becomes possible to work with a winch with small capacity. That is, when the extension line border tower is in a mountainous area and the like and the winch must be transported using a helicopter, it is possible to work with a winch having a small weight corresponding to the transport capability of the helicopter.

  In the wire tension reduction method of the present invention, when the four wires wired through the connecting yoke fitting and the retention clamp are re-hanged to the tension insulator provided on each armature of the steel tower, A step of loosening the tension between the cable clamp and the connecting yoke fitting of the four wires on the opposite side across the wire and the arm bracket, and a fitting that holds the slack of the length corresponding to the pre-calculated tension equivalent to the two breaks Is provided with a step of feeding between the retention clamp and the connecting yoke fitting.

  According to the present invention, the four wires on the opposite side across the four wires and the armrest to be redrawn are drawn toward the steel tower, and the tension of the wires between the tension clamp and the connecting yoke fitting is relaxed. Next, the connection between the tension clamp and the connection yoke metal fitting is released, and a metal fitting that holds a slack of a length corresponding to a pre-calculated tension corresponding to two cut lines is provided between each tension clamp and the connection yoke metal fitting. Connect, feed 4 wires into the span, and apply the wire tension to the metal fittings.

  Thereby, the slackness of the four wires corresponding to the length of the metal fitting fed into the span increases, and the wire tension can be reduced.

  As a result, the 4 wires can be loosened and the tension can be smoothly reduced, so that it is excellent in economy and shortening the construction period compared with the conventional construction method. That is, compared with the conventional arm metal temporary anchoring method using existing electric wires, the number of days of charge stoppage associated with the preparation work is not required, and the construction period can be greatly shortened and the cost can be greatly reduced. In addition, since no branch line is required compared to the method of detention using a branch line, land acquisition and compensation costs are not required, which can greatly reduce costs and reduce forest logging as much as possible. it can.

  In the wire tension reduction method of the present invention, four wires are connected to a tension insulator provided on each armrest of a steel tower via a connecting yoke fitting and a retention clamp, and the four wires and armrests to be replaced are connected. Is a wire tension reduction method that reduces the tension of the four wires on the opposite side to the equivalent of two breaks, with one end of a pair of mounting wires connected to the connecting yoke bracket, After connecting the end to the earth-side semi pulley, wind a traction wire between the earth-side semi pulley and the line-side semi pulley, and fix one end of the wire to the line-side semi-pulley. The top balancer gold wheel and the ground balancer gold wheel are connected to the triangular link, and the cam wires are attached to the four wires. After connecting the base wire wound around the balancer gold wheel, and connecting the base wire wound around the ground side balancer gold wheel to a pair of ground side cam along, connect the towing wire through the arm bracket and the steel tower. After winding up through the winch installed on the ground and loosening the four wires between the cam along and the tension clamp in a lump, the connection between the tension clamp and the connection yoke fitting is released, and each tension clamp The connecting metal fittings are respectively connected to the connecting yoke metal fittings, then the pulling wire is fed out through the winch, and the four wires are collectively fed into the span to apply tension to the connecting metal fittings. Is.

  According to the present invention, one end of the pair of mounting wires is connected to the connecting yoke fitting that connects the wire holding clamp and the tension insulator, and the other end of the pair of mounting wires is connected to the ground-side semi pulley. After that, a traction wire is wound between the ground side semi pulley and the line side semi pulley, and one end is fixed to the line side semi gold pulley. Next, the triangular link is connected to the semi pulley on the line side, and the top balancer gold wheel and the ground balancer gold wheel each having a mounting wire wound around the triangular link are connected. Furthermore, while attaching cam along to each of the four wires, a mounting wire wound around the top balancer gold wheel was connected to the cam along attached to the pair of top wires, and attached to the pair of wires on the ground side. Connect the mounting wire wound around the ground balancer gold wheel to Cam Along. Next, the winch installed on the ground is driven to wind the towing wire through the arm bracket and the steel tower, and the four wires are pulled together via the line-side semi pulley, that is, the cam along. After loosening the four wires in between, the connection between each retention clamp and the connection yoke bracket is released, the connection bracket is connected between each retention clamp and the connection yoke bracket, and the winch is driven to pull. The wire is fed out, and the four wires are collectively fed into the span via the line-side semi pulley, that is, the cam along, to apply tension to the connecting fitting.

  Thereby, the slackness of the electric wire is increased by the length of the connection fitting fed into the span, and the electric wire tension can be reduced. In this case, the length of the connecting metal fitting is set in advance based on the type of the electric wire, the span between the wires, and the like so that the tension can be reduced to the equivalent of the two wire breaks.

  As a result, it is possible to reduce the tension smoothly by loosening the four strips of wires while balancing them all together, so that it is excellent in economy and shortening the construction period compared to the conventional construction method. That is, compared with the conventional arm metal temporary anchoring method using existing electric wires, the number of days of charge stoppage associated with the preparation work is not required, and the construction period can be greatly shortened and the cost can be greatly reduced. In addition, since no branch line is required compared to the method of detention using a branch line, land acquisition and compensation costs are not required, which can greatly reduce costs and reduce forest logging as much as possible. it can.

  According to the present invention, at the time of wire replacement, the wire on the opposite side of the wire can be loosened simultaneously to reduce the tension to the equivalent of a two-wire break. As a result, it is possible to simultaneously remove and replace the four wires to be replaced while satisfying the design conditions of the steel tower.

It is a side view which abbreviate | omits and shows one Embodiment of the electric wire tension | tensile_strength reduction apparatus constructed in the electric wire of this invention. It is a side view explaining the process of constructing the electric wire tension reduction apparatus of FIG. FIG. 3 is a plan view and a side view showing the process of installing the wire tension reducing device of FIG. It is a side view which shows the process of constructing the electric wire tension reduction apparatus of FIG. 1 on an electric wire following FIG. It is a side view which shows the process of constructing the electric wire tension reduction apparatus of FIG. 1 on an electric wire following FIG. It is the front view and side view of a semi pulley which comprise an electric wire tension reduction apparatus. It is the front view and side view of a balancer gold wheel which comprise an electric wire tension reduction device. It is a perspective view of the connection metal fitting which constitutes an electric wire tension reduction device. It is a top view which shows the relationship between the tension insulator provided in the armrest of the steel tower, a connection yoke metal fitting, and the wire clamp. It is a side view which shows the relationship between the tension insulator of FIG. 9, a connection yoke metal fitting, and the cable clamp of an electric wire. Schematic representation of the normal relationship between the upstream wire tension and the downstream wire tension wired over the steel tower arm via the tension insulator, and the relationship when two of the four wires are cut It is explanatory drawing shown. It is explanatory drawing which shows typically the tension | tensile_strength reduction | decrease point by a conventional construction method, when replacing the downstream electric wire among the electric wires wired to the armrest of the steel tower via the tension insulator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a tension reducing device 1 of the present invention.

  This tension reducing device 1 is used in a case where, for example, in a vertically arranged two-line steel tower, the four-phase electric wires W wired over the armatures 11 of the steel tower 10 via the tension insulators 12 are replaced. The target four wires W are applied to the four wires W on the opposite side across the arm 11.

  Here, prior to describing the tension reducing device 1, first, the relationship between the four-phase electric wires W and the brace 11 of the steel tower 10 will be described with reference to FIGS. 9 and 10.

  The four-phase electric wires W are gripped by spacers (not shown) arranged at appropriate intervals in the overhead line direction so as to be positioned at the vertices of the square when viewed from the overhead line direction and to maintain the mutual distance. ing. And about each electric wire W, when seeing from an overhead line direction, the upper and lower sides are prescribed | regulated to the top side ground side, and the left and right sides are prescribed | regulated to the inner side outer side, respectively.

  A tension insulator device 12 is connected to the armature 11 of the steel tower 10, while a tension clamp 13 is fixed to each of the four wires W. The tension clamp 13 and the tension insulator device 12 are connected to each other. They are connected via a yoke fitting 14. The connecting yoke fitting 14 is connected to a pair of retaining clamps 13 for grasping the pair of electric wires W on the top side via a link and a right angle clevis C, and the pair of electric wires W on the ground side. The ground side double yoke 142 connected to the pair of retaining clamps 13 via the link and the right angle clevis C, and the vertical side connected to the top and bottom double yokes 141 and 142 via the right angle clevis C. The double yoke 143 and the line side double yoke 144 connected to the vertical double yoke 143 via the right angle clevis C are provided, and the line side double yoke 144 is connected via the right angle clevis C. It is connected to.

  On the other hand, as shown in FIGS. 1 and 2, the tension reducing device 1 has one end on each of the line side double yokes 144 of the connecting yoke fitting 14 via U clevis C1 (see FIG. 3A). A pair of connected mounting wires 2, a ground side semi pulley 3 connected to the other end of the pair of mounting wires 2 via a U clevis C 1, and one end of the pulling wire 4 are fixed to the ground side semi Each of the line side semi pulley 3 around which the traction wire 4 is wound between the pulley 3, the triangular link 5 having the apex portion connected to the line side semi pulley 3 via the U clevis C 1, and each of the triangular links 5 A top balancer gold wheel 6 and a ground balancer gold wheel 6 connected to the bottom corners via U clevis C1 respectively, and a pair of windings wound around the top balancer gold wheel 6 and the ground balancer gold wheel 6 respectively. Mounting wires 2 and 4 Each of the connecting wires 8 are connected to each other between the top side double yoke 141 of the connecting yoke fitting 14 and the tension clamp 13. Each end of the mounting wire 2 wound around the top balancer gold wheel 6 is connected to the pair of cam alongs 7 via the U clevis C1 and the pair of electric wires W on the ground side. Each end of the mounting wire 2 wound around the ground balancer gold wheel 6 is connected to the pair of cam along 7 via the U clevis C1.

  Here, as shown in FIG. 6, the semi pulley 3 supports a plurality of sheaves 31 (in the embodiment, four sheaves corresponding to the total tension 160 kN of the four wires W) 31 in a freely rotatable manner. In addition, a shackle 32 is provided, and a U clevis C1 that connects each end of the pair of mounting wires 2 is connected to the shackle 32 of the ground-side semi pulley 3, and is connected to the shackle 32 of the line-side semi pulley 3. The U clevis C1 connected to the apex portion of the triangular link 5 is connected. Then, after one end of the pulling wire 4 wound between the ground side semi pulley 3 and the line side semi pulley 3 is fixed to the line side semi pulley 3, the sheave 31 of the ground side semi pulley 3, The sheave 31 of the line-side semi pulley 3 is wound in this order, and the other end is fixed to a winch (not shown) installed on the ground side through the armature 11 and the steel tower 10.

  Further, as shown in FIG. 7, the balancer gold wheel 6 rotatably supports a sheave 61 around which the mounting wire 2 is wound, and has a connecting portion 62 that can be connected via the triangular link 5 and the U clevis C1. It is provided and formed.

  Further, as shown in FIG. 8, the connecting fitting 8 is formed in a chain shape by sandwiching the link 81 between the pair of link plates 82 in the front and rear thereof and sequentially connecting via the pins 83. A tension meter 84 is disposed in place of the link 81. The length of the connection fitting 8 is set in advance to a necessary length so that the tension of the electric wire W can be reduced to a size corresponding to a two-strand break. That is, by arranging the connecting metal fitting 8 having a set length, the slackness of the electric wire W is increased, and the electric wire tension is reduced to a necessary size.

  Next, a description will be given of a procedure for reducing the tension of the electric wire W on the opposite side across the wire to be replaced and the arm metal 11 when the electric wire is changed using the tension reducing device 1 configured as described above.

  First, a pair of balancer gold wheels 6, a triangular link 5, a pair of semi pulleys 3, and a pair of bases each having four cam alongs 7 and winding wires 2 wound around the wire W on the line side with reference to the retaining clamp 13. The attachment wire 2 is arranged via a suspension fitting (not shown).

  Next, one end of the pair of mounting wires 2 is connected to the line side double connecting yoke 144 of the connecting yoke fitting 14 via the U clevis C1, and the other end of the pair of mounting wires 2 is connected to the U clevis C1. At the same time, the U clevis C1 is connected to the shackle 32 of the earth-side semi pulley 3, and the connecting yoke fitting 14 and the earth-side semi pulley 3 are connected via the pair of mounting wires 2. Further, the pulling wire 4 secured to a winch (not shown) whose base end is installed on the ground is fed out, and through the steel tower 10 and the arm bracket 11, the sheave 31 of the line-side semi pulley 3 and the sheave 31 of the ground-side semi pulley 3. The tip is fixed to the line side semi pulley 3 (see FIG. 2).

  Further, the apex angle portion of the triangular link 5 is connected to the shackle 32 of the line side semi-pulley 3 via the U clevis C1, and the balancer wheel 6 is connected to each bottom corner portion of the triangular link 5 via the U clevis C1. The connecting part 62 is connected. After that, the cam along 7 is attached to each of the four wires W, and each end of the mounting wire 2 wound around the top balancer gold wheel 6 is attached to the cam along 7 that grasps the pair of wires W on the top side. Each end of the mounting wire 2 wound around the ground balancer gold wheel 6 is connected via the U clevis C1 to the cam along 7 which respectively grasps each of the ground side pair of electric wires W. (See FIG. 2).

  In this way, the four wires W are wound between the cam along 7, the mounting wire 2, the balancer gold wheel 6, the triangular link 5, the line side semi gold wheel 3, the ground side semi gold wheel 3, and the semi pulley 3. The winch installed on the ground after releasing the suspension of the semi pulley 3 and the like by the suspension fitting with respect to the electric wire W if it is connected to the connection yoke fitting 14 via the pulled pulling wire 4 and the mounting wire 2. To start winding of the pulling wire 4 wound between the line-side semi-gold wheel 3 and the ground-side semi-gold wheel 3 (see FIG. 3).

  By winding the pulling wire 4, the line-side semi pulley 3 is gradually approached to the ground-side semi pulley 3. That is, since the cam-along 7 is connected to the line-side semi-metal wheel 3 via the triangular link 5, the balancer metal wheel 6 and the mounting wire 2, the four wires W that each cam-along 7 grasps are bundled. Then, the electric wire W between the steel tower 10 and the retention clamp 13 is loosened (see FIG. 4).

  At this time, the tension of the pulling wire 4 that pulls the electric wire W is reduced to 1/9 of the electric wire tension by the pair of semi pulleys 3, and the work can be performed with a small capacity winch. That is, when the extension line border tower is in a mountainous area and the like and the winch must be transported using a helicopter, it is possible to work with a winch having a small weight corresponding to the transport capability of the helicopter. Specifically, a winch having a traction capability of 20 kN (160 kN / 9≈18 kN) that can be transported by a helicopter can be used.

  In addition, among the four wires W, the two inner and outer wires W on the top side are supported via the top balancer gold wheel 6 and the mounting wire 2, and the two inner and outer wires W on the ground side are supported on the ground side. It is supported via the balancer gold wheel 6 and the mounting wire 2, and the top balancer gold wheel 6 and the ground balancer gold wheel 6 are connected via the triangular link 5, and the triangular link 5 is connected to the line-side semi pulley 3. By pulling through the wires, even if the four wires W are pulled together, the balance of the four wires W is not lost. Therefore, it is possible to prevent the spacers that grip the four wires W from being spaced apart from each other, and the gripping portion does not damage the wires W due to the inclination of the spacers.

  If the electric wire W between the cam along 7 and the tension clamp 13 is loosened, the link of each tension clamp 13 and the right angle clevis C of the two-sided yokes 141 and 142 are released, and then the link of each tension clamp 13 The link plate 82 of each connecting metal fitting 8 is connected to each other, and the link 81 of each connecting metal fitting 8 is connected to the right angle clevis C of the two-sided double yokes 141, 142 (see FIG. 5).

  When the connection fitting 8 is connected, the winch is driven again to pull out the traction wire 4, and the four cam along 7 for grasping the line side semi pulley 3, that is, the four wires W with respect to the ground side semi pulley 3. Are collectively separated from the arm 11 of the steel tower 10 and sent out in a direction to eliminate the looseness of the wire W grasped by the cam along 7 and the connecting fitting 8 connected to the tension clamp 13.

  If the electric wire W and the connection fitting 8 are in a tension state by driving the winch and feeding the pulling wire 4, the load is transferred to the connection fitting 8 and the tension of the electric wire W can be supported. This state can be grasped by the tensiometer 84 provided on the connecting metal fitting 8.

  In this way, by feeding the connecting fitting 8 between the diameters, the slackness of the electric wire W is increased by the length of the connecting fitting 8, and the tension of the electric wire W is reduced. That is, by inserting the connecting fitting 8 having a length calculated in advance between the retention clamp 13 and the connecting yoke fitting 14, the slackness of the electric wire W is increased, and the electric wire tension is reduced to the equivalent of two cuts. The tension can be supported by the arm metal 11 of the steel tower 10.

  As a result, it is possible to smoothly reduce the required tension by loosening the four wires W while balancing them together, and it is excellent in economy and shortening the construction period compared with the conventional construction method. . That is, as compared with the conventional arm metal temporary anchoring method using existing electric wires, the number of days of charge stoppage accompanying the preparation work is not required, and the construction period can be greatly shortened and the cost can be greatly reduced. On the other hand, since branch lines are not required compared to the branch line method, land acquisition and compensation costs are unnecessary, which can greatly reduce costs and reduce forest logging as much as possible. it can.

  Moreover, although it will be in a temporary state over a fixed period, the looseness of the electric wire W can be ensured by disposing the high-strength connection fitting 8 between the retention clamp 13 and the connection yoke fitting 14, and the reliability of the work period can be ensured. Sex can be secured. Furthermore, by working in a state where tension is always applied to the tension insulator device 12, the tension insulator device 12 can be operated without being lowered to the ground.

  Thus, if the tension of the four wires on the opposite side to the object to be restretched is reduced to a set value, a conventionally known rehabilitation method using a hanging wheel or the like is not shown in detail. After removing the four wires W to be re-stretched at the same time, the re-sequence may be re-sequential.

  In the above-described embodiment, the case where the semi pulley 3 provided with the four sheaves 31 is used corresponding to the total tension of the four wires W being 160 kN is illustrated. When the total tension is 120 kN, the semi pulley 3 having three sheaves can be used. In this case, similarly, the tension acting on the pulling wire 4 wound between the line side semi pulley 3 and the earth side semi pulley 3 becomes 1/7.

DESCRIPTION OF SYMBOLS 1 Electric wire tension reduction device 2 Mounting wire 3 Semi pulley 4 Pulling wire 5 Triangular link 6 Balancer metal wheel 7 Cam along 8 Connection metal fitting 10 Steel tower 11 Arm metal 12 Tensile tensioning device 13 Drain clamp 14 Connection yoke metal fitting W Electric wire

Claims (6)

  Four wires are connected to the tension insulator provided on each arm of the steel tower via a connecting yoke fitting and a retaining clamp, and the four wires on the opposite side are sandwiched between the four wires and the arm that are to be replaced. A wire tension reducing device that reduces the tension of an electric wire to the equivalent of a two-wire break, and a traction wire between an earth-side semi pulley connected to a connecting yoke bracket via a pair of mounting wires and an earth-side semi pulley Is connected to the line-side semi-pulley, the top-side balancer gold wheel and the ground-side balancer gold wheel, which are respectively connected to the line-side semi-pulley via a triangular link. Cam-along attached to each of the mounting wire wound around the top balancer gold wheel and the mounting wire wound around the ground balancer gold wheel, respectively, the respective clamps and the connecting yaw. It is composed of a linked connecting fitting between fittings, wire tension reducing apparatus characterized by increasing the slackness of the wire is fed into the connecting fitting by driving the winch puller wire installed in the ground in the span.   2. The electric wire tension reducing device according to claim 1, wherein the connecting metal fitting is formed of a plurality of links and a plurality of pairs of link plates that sandwich the front and rear of each link and are rotatably connected to each other via pins. Electric wire tension reduction device characterized by. In the wire tension reducing device according to claim 1 or 2, the wire tension reducing device characterized by providing a tensiometer to the connecting fitting of one even without low. The wire tension reducing device according to any one of claims 1 to 3, wherein each of the ground side semi pulley and the line side semi pulley rotatably supports a plurality of sheaves. .   When replacing the four wires wired through the connecting yoke fitting and the retaining clamp to the tension insulator provided on each armature of the steel tower, the opposite side across the four wires and the armrest to be replaced The step of loosening the tension between the cable clamp and the connecting yoke fitting of the four wires and the metal fitting that holds the slack of the length corresponding to the pre-calculated tension equivalent to the two wire breakage wire between the tension clamp and the connecting yoke fitting An electric wire tension reduction method characterized by comprising a feeding step.   Four wires are connected to the tension insulator provided on each arm of the steel tower via a connecting yoke fitting and a retaining clamp, and the four wires on the opposite side are sandwiched between the four wires and the arm that are to be replaced. An electric wire tension reduction method for reducing the tension of an electric wire to the equivalent of a two-wire breakage, wherein one end of a pair of mounting wires is connected to a connecting yoke fitting, and the other end of each mounting wire is connected to an earth-side semi pulley. After that, a traction wire is wound between the earth side semi pulley and the line side semi pulley and one end thereof is fixed to the line side semi pulley, and then a triangular link is connected to the line side semi pulley and the triangular link is attached to the triangle link. The side balancer gold wheel and the ground balancer gold wheel were connected to each other, and the cam wires were attached to the four wires, respectively, while the top balance cam wheel was wound around the top balancer gold wheel. After connecting the attachment wire and connecting the base wire wound on the ground balancer gold wheel to a pair of ground side cam along, wind the tow wire through the winch installed on the ground via the arm bracket and steel tower The four wires between the cam along and the tension clamp are loosened all at once, and then the connection between the tension clamp and the connection yoke metal is released, and the connection metal between each tension clamp and the connection yoke metal. The wire tension reduction method is characterized in that the traction wires are connected through the winch, and then the four wires are collectively fed into the span to apply tension to the connection fitting.

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