JP4101828B2 - Electric wire replacement method and protective net used for it - Google Patents

Description

  The present invention relates to an electric wire replacement method for replacing an existing electric wire installed between two steel towers with a new wire, and more particularly to a technique for preventing an electric wire from dropping to the ground in an electric wire installation section.

  2. Description of the Related Art Conventionally, an inverted suspension car method is known as one of methods for replacing an existing electric wire (hereinafter referred to as an old line) with a new electric wire (hereinafter referred to as a new line). This construction method uses a known reversing hanging wheel, a pulling rope is passed through the lower frame of the reversing hanging wheel, and a roller of the upper frame is placed on the old line. The reversing suspension wheel is connected with a connecting rope. And a connection rope is pulled with the self-propelled machine which runs on an old line, and a plurality of reverse suspension cars are arranged at a predetermined interval between two steel towers. Then, the new line is drawn along the old line by connecting the new line to one end of the pulling rope and pulling the other end. When a new line is arranged between the steel towers, tension is applied to the new line, and the tension of the old line is relaxed, and the inverted suspension wheel is turned upside down. Then, the new line is fixed and the old line is pulled out to complete the replacement work.

In such a reverse hanging car construction method, if a new line or an old line is cut during work, there is a possibility that the electric wire may fall to the ground. For this reason, conventionally, in order to prevent the ground structure from being damaged even if the electric wire is dropped, an operation of setting a protective net directly on the ground structure has been performed prior to the replacement work.

JP-A-5-64327

  However, when a protective net is separately arranged immediately above the ground structure, a work for installing the protective net is required in addition to the work for replacing the electric wires, and there is a problem that efficient reworking is not possible. .

In addition, when a protective net is separately arranged immediately above the ground structure, it is necessary to arrange the protective net with sufficient margin in consideration of the bending of the net when the electric wire falls. However, there are cases where the protection net cannot be arranged with such a margin depending on the wire replacement site.

  The present invention has been made for the purpose of solving the above-mentioned conventional problems, and enables the protective net to be arranged in a necessary protective area by the work of arranging the reversing suspension wheel at predetermined intervals along the old line. In addition to realizing efficient wire replacement work, even when there is not enough space directly above the ground structure, the wire replacement method enables wire replacement work with a protective net provided And its protective net.

In order to achieve the above object, the wire replacement method according to the present invention was adopted as a solution to the old wire (1) installed between the two towers (10a, 10b), with respect to the pulling rope (9) Hang the reversing suspension wheel (20) inserted through the steel tower and feed it from one steel tower (10b) to the other steel tower (10a) at predetermined intervals, After deploying in the spare area, place the new line (2) between the two towers by pulling the other end with the new line (2) connected to one end of the pull rope (9) Two support ropes (4,4) supported at positions spaced apart from each other across the old wire (1) in the construction method in which the old wire (1) is pulled out and removed after turning the car (20) upside down A plurality of horizontal ropes (6,..., 6) are installed between the two vertical ropes (5, 5) for each of the plurality of inverted suspension wheels (20). Each rope (5,5) is different Support rope
The process of deploying each inverted suspension wheel (20) in the tensioning section while holding (4,4), and two supports after deploying the inverted suspension wheel (20) in the tensioning section Forming a protective net (50) in a state in which the ropes (4, 4) are tensioned and separated from each other, and a plurality of horizontal ropes (6, ..., 6) cross below the old line (1); After the protection net (50) is constructed, the new line (2) is disposed and the old line (1) is removed. By adopting such a construction method, it is possible to arrange the protective net below the old line along with the work of deploying a plurality of inverted suspension cars in the re-covering area, and when constructing the new line, and In any case when the old line is removed, the protective net can be kept under the new line and the old line.

Further, the protection net according to the present invention employs a guide member (26) having an upper frame (21) and a lower frame (23) and connected to the upper frame (21) and the lower frame (23). ), Two vertical ropes (5, 5) are slidably attached to the guide member (26) of the inverted hanging wheel (20) with the old wire (1) attached to the upper frame (21 ) And a new line (2) or a pulling rope (9) are inserted into the lower frame (23) and are provided at a predetermined distance from each other across the old line (1). Support ropes (4, 4) are held at the tip portions of different vertical ropes (5, 5), and a plurality of horizontal ropes (6, ..., 6) are provided between the two support ropes (4, 4). ) Is constructed so as to be installed at predetermined intervals. By adopting such a configuration, when deploying a plurality of reversing suspension cars in the rehabilitation area, the reversing suspension truck transports the protective net while holding the support rope, so it is directly below the old and new lines. Can be provided with a protective net.

Furthermore, the protection net according to the present invention employs two solutions that are supported at positions spaced apart from each other across the old wire (1) installed between the two towers (10a, 10b). A support rope (4, 4) and a plurality of horizontal ropes (6, ..., 6) installed between the two support ropes (4, 4) and arranged at predetermined intervals along the old line A plurality of inverted suspension wheels (20), and two vertical ropes (5,5) for holding the supporting ropes (4, 4), which are different from each other, in the inverted suspension wheel (20). And by applying tension to each of the two support ropes (4, 4), a plurality of lateral ropes (6, ..., 6) cross under the old line (1). It is in the point where it is stretched. Even when adopting such a configuration, when deploying a plurality of reversing suspension vehicles in the rehabilitation area, the reversing suspension vehicles can carry the protective net while holding the support rope, directly under the old and new lines. Can be provided with a protective net.

  According to the present invention, when a plurality of reversing suspension wheels are disposed between two steel towers, the reversing suspension vehicle can be disposed in a state where the two support ropes constituting the protective net are held. Therefore, the arrangement of the protective net can be performed simultaneously with the unfolding work of the inverted hanging wheel, and the efficient work becomes possible. In addition, since the protective net is constructed in such a way that two support ropes are separated from each other by applying tension to the two support ropes, it is sufficient to install the protective net directly above the ground structure. Even if there is no space, the wire replacement work can be performed with a protective net provided directly under the old line.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing a state in which a protective net 50 according to the present embodiment is arranged below the old line 1. In FIG. 1, the case where the old line (aerial ground wire) 1 constructed in the front-end | tip part of the arm 11 provided in the uppermost stage of the steel tower 10 is replaced with a new line is illustrated. In this case, an auxiliary arm 12 is temporarily installed on the arm 11. The auxiliary arm 12 is provided so as to be substantially perpendicular to the old line 1, and is arranged so that the old line 1 is located substantially at the center of the auxiliary arm 12. Support means 13 for supporting the support rope 4 is provided at both ends of the auxiliary arm 12, whereby the two support ropes 4 are arranged at a predetermined interval with the old line 1 being sandwiched therebetween. A support means 14 for supporting the connecting rope 3 is provided at the center of the auxiliary arm 12. Note that an auxiliary arm is also temporarily installed in the steel tower facing the steel tower 10.

  A plurality of inverted hanging wheels 20 are supported by the old line 1 and arranged along the old line 1 at predetermined intervals. Each reversing hanging wheel 20 is connected to another reversing hanging wheel adjacent thereto by a connecting rope 3, and the arrangement interval of the reversing hanging wheel 20 is defined by this connecting rope 3. In addition, two vertical ropes 5 are attached to each reversing suspension wheel 20, and a bean wheel 30 that holds the support rope 4 in a state where the support rope 4 is inserted is attached to the tip of each vertical rope 5.

Each support rope 4 is provided with a plurality of bean wheels 30 at predetermined intervals, and these bean wheels 30 are laterally disposed between the opposite bean wheel wheels provided on the other support rope 4. A rope 6 is installed. That is, between the two support ropes 4, a plurality of horizontal ropes 6 laid at right angles to the extending direction of the old line 1 are provided at predetermined intervals. And the arrangement | positioning space | interval of the horizontal rope 6 is prescribed | regulated by the connection rope 7 which connects the bean wheel 30, and is the arrangement | positioning space | interval finer than the arrangement | positioning space | interval of the inversion hanging wheel 20. FIG. The length of the horizontal rope 6 is preferably longer than the arrangement interval of the two support ropes 4 in the auxiliary arm 12. Moreover, it is preferable to connect the horizontal rope 6 between the two bean wheels 30 attached to the inverted hanging wheel 20 at the tip of the vertical rope.

  Then, by pulling the two support ropes 4 arranged substantially parallel to the old line 1 through the support means 13, both the support ropes 4 are tensioned, and the two support ropes 4 are separated from each other. At this time, a plurality of horizontal ropes 6 laid between the two support ropes 4 are stretched so as to cross below the old line 1 and the new line 2, and thereby below the old line 1 and the new line 2. A protective net 50 is formed. Therefore, in this state, if the installation work of the new line 2 and the removal work of the old line 1 are performed, even if the electric wire is cut in the middle of the operation, the electric wire is caught by the horizontal rope 6 and below it. It will not fall and will not damage the ground structure.

  FIG. 2 is a view showing the inverted hanging wheel 20 and its attached members. As shown in FIG. 2, the inverted hanging wheel 20 includes an upper frame 21 having an upper roller 22 and a lower frame 23 having a lower roller 24, and the connecting rope 3 is interposed between the upper frame 21 and the lower frame 23. The fixing means 25 for fixing is provided. As shown in FIG. 2 (b), the reverse hanging wheel 20 is configured such that the side wall 21a of the upper frame 21 and the side wall 23a of the lower frame 23 are opened, and the old line is opened from the opened gap. By accommodating each of 1 and the new line 2 in the frame and fixing the side walls 21a and 23a, the old line 1 and the new line 2 are inserted into each frame. For example, the old line 1 is inserted into the space below the upper roller 22 in the upper frame 21, and the new line 2 (or the pulling rope) is inserted into the space above the lower roller 24 in the lower frame 23. In addition, as shown in FIG. 2A, the inverted hanging wheel 20 includes a guide member 26 connected to the upper end portion of the upper frame 21 and the lower end portion of the lower frame 23, and the guide member 26 has 2 to the guide member 26. A vertical rope 5 of the book is slidably attached. The money wheel 30 attached to the tip of each vertical rope 5 includes a through hole 31 through which the support rope 4 is inserted, a first fixing means 32 for fixing the ends of the vertical rope 5 and the horizontal rope 6, and the like. The second fixing means 33 for fixing the connecting rope 7 for connecting with the bean wheel at a predetermined interval is provided. When tension is not applied to the support rope 4, the support rope 4 is held in a state of being suspended by the vertical rope 5 and the bean wheel 30 of the inverted hanging wheel 20 at predetermined intervals. Therefore, the inverted hanging wheel 20, the vertical rope 5 and the bean wheel 30 function as a protection net holding device 51 for transporting the protection net 50 along the old line 1.

  FIG. 3 to FIG. 7 are diagrams showing the procedure of the wire replacement method in the present embodiment, illustrating the case where the old line 1 installed between the steel towers 10a, 10b is replaced, and the replacement section thereof. A protected area 16 where a train or the like travels is defined in a part of the area. However, the protected area may be the entire stretch section.

  In the electric wire replacement method according to the present embodiment, the connecting rope 3a is disposed between the steel towers 10a and 10b to which the auxiliary arms 12 (see FIG. 1) are attached, and an inverted suspension wheel is provided at one end of the connecting rope 3a. The connecting rope 3b which arrange | positions 20 to every predetermined space | interval is connected, and it is set as the state where each inversion suspension wheel 20 hold | maintained the above-mentioned protection net | network 50. Then, by pulling the connecting rope 3a from the other steel tower, the reverse hanging wheel 20 and the protective net 50 are simultaneously deployed between the steel towers 10a and 10b. Thereafter, tension is applied to the two support ropes 4 to widen the protective net 50 below the old line 1, and in that state, the old line 1 is replaced with the new line 2 by the conventional reverse hanging car construction method. . When the replacement of the electric wires is completed, the protective net 50 and the like are removed from the steel towers 10a and 10b to complete the work. Hereinafter, specific examples of such a construction method will be described with reference to FIGS.

First, as shown in FIG. 3, a self-propelled aircraft 15 equipped with an engine is attached to the old line 1, and the connecting rope 3 a is connected to the self-propelled aircraft 15. Then, the self-propelled machine 15 is caused to travel from the first steel tower 10a toward the second steel tower 10b, and the connecting rope 3a is sent from the first steel tower 10a to the second steel tower 10b. At this time, the hanging wheel 40 suspended from the old line 1 and capable of traveling along the old line 1 is provided at predetermined intervals with respect to the connecting rope 3a. When the self-propelled aircraft 15 arrives at the second iron tower 10b, the second rope 10b has a connection rope 3b, two support ropes 4, and a pulling rope 9 at the end of the connection rope 3a. Are connected.

Then, as shown in FIG. 4, by pulling the connecting rope 3a at the first tower 10a, the hanging wheel 40 is recovered, and the connecting rope 3b, the support rope 4 and the pulling rope 9 are deployed in the tension section. . At this time, the connecting rope 3b sent out from the second steel tower 10b is provided with a reverse hanging wheel 20 at every predetermined interval (for example, 15 m), and each of the reverse hanging wheels 20 is supported by each of the two vertical ropes 5. With the rope 4 supported, the vehicle travels on the old line 1 as the connecting rope 3b moves. A plurality of lateral ropes 6 are provided at predetermined intervals (for example, 3 m) at least at a portion of the two support ropes 4 disposed above the protection area 16. And when the edge part of the connection rope 3b arrives at the 1st steel tower 10a, while the some reverse suspension wheel 20 is arrange | positioned in a reshuffling section at substantially equal intervals, the some spanned by the two support ropes 4 A lateral rope 6 is arranged above the protective area 16. At this time, each of the two support ropes 4 is attached to an auxiliary arm 12 provided in the first steel tower 10a.

As shown in FIG. 5, when a plurality of reversing suspension wheels 20 are arranged over the entire stretch section and the arrangement of the plurality of horizontal ropes 6 is completed above the protection area 16, two support ropes are provided in one or both of the steel towers. A tension is applied to each of 4. As a result, the two support ropes 4 are in tension between the steel towers 10a and 10b, and the support ropes 4 are separated from each other with the old line 1 interposed therebetween as shown in FIG. The plurality of horizontal ropes 6 are stretched so as to cross the lower part of the old line 1, and as a result, a protective net 50 is formed. At this time, the two vertical ropes 5 attached to each reversing hanging wheel 20 have no function of supporting the support rope 4 and are bent, but no problem occurs.

Then, with the protective net 50 formed as shown in FIG. 1, for example, the new wire 2 is connected to the end 9a of the pulling rope 9 in the second steel tower 10b, and a driving means such as a winch is used from the first steel tower 10a. By pulling the pulling rope 9, the new line 2 is arranged from the second tower 10b toward the first tower 10a. In addition, when carrying out the wire replacement work not only in the replacement section of the first steel tower 10a and the second steel tower 10b, but also in a wide section including other adjacent steel towers, The pulling ropes arranged in the same way are connected to each other, the new line 2 is connected to the end portion 9a of the pulling rope 9 at the steel tower located at one end of the entire re-covering section, and the pulling rope 9 is connected at the steel tower located at the other end By pulling, the new line 2 is continuously expanded over the entire replacement section. By such work, the new line 2 sequentially passes through the lower frame 23 of the inverted hanging wheel 20 through which the pulling rope 9 is inserted, and finally the end 9a of the pulling rope 9 is connected to the first steel tower 10a. If it arrives, the new line 2 can be arrange | positioned in the spanning section of the 1st steel tower 10a and the 2nd steel tower 10b. At this time, even if the pulling rope 9 or the new line 2 is cut, the end of the cable is caught by the horizontal rope 6 constituting the protective net 50 and does not fall below that. Therefore, there is no influence on the protected area 16.

  When the new line 2 is normally arranged with respect to the reshuffling section, the new line 2 is fixed in each steel tower and tension is applied to the new line 2. Conversely, the tension of the old wire 2 is relaxed. Thereby, the height positions of the new line 2 and the old line 1 are reversed, and the inverted hanging wheel 20 is inverted upside down. FIGS. 8A and 8B are diagrams showing the upside down operation of the inverted hanging wheel 20, wherein FIG. 8A shows a state before inversion, and FIG. 8B shows a state after inversion. Before the reversal, the reversing hanging wheel 20 is supported by the old line 1 inserted through the upper frame 21. By applying tension to the new line 2 and loosening the tension of the old line 1, FIG. As shown in b), the inverted hanging wheel 20 is turned upside down and changed to the state supported by the new line 2. At this time, the vertical rope 5 slides along the guide member 26, and the state positioned below the reversing hanging wheel 20 before and after reversing does not change. Therefore, even when the reverse hanging wheel 20 is reversed by applying tension to the new line 2 and loosening the tension of the old line 1, a plurality of horizontal ropes 6 below the new line 2 and the old line 1. The state where the protective net 50 is formed does not change.

After the inverted hanging wheel 20 is turned upside down in this way, the end of the pulling rope 9 previously connected to the new line 2 is connected to the end of the old line 1 in the first tower 10a. Then, by pulling out the old line 1 from the second iron tower 10b, the old line 1 is removed from the replacement section between the first iron tower 10a and the second iron tower 10b. In addition, when the removal work of the old line 1 is performed not only in the replacement section of the first tower 10a and the second tower 10b, but also in a wide section including other adjacent towers, the entire replacement section By connecting the pulling rope 9 to the end of the old line 1 at the steel tower located at one end of the cable, and pulling out the old line 1 at the steel tower located at the other end, the old line 1 is removed at the same time in the entire stretch section . With such removal work, the pulling rope 9 is again arranged between the first tower 10a and the second tower 10b. At this time, even if the pulling rope 9 or the old line 1 is cut, the end of the cable is caught by the horizontal rope 6 constituting the protective net 50 and does not affect the protective area 16 at all. .

And when the removal work of the old line 1 is complete | finished, it will move to collection | recovery work, such as the protection net | network 50 arrange | positioned between the steel towers 10a and 10b, an inversion suspension car. In this recovery operation, first, the tension of the two support ropes 4 is released. As shown in FIG. 6, in the first tower 10a, the connecting rope 3a provided with the suspension wheel 40 at predetermined intervals is connected to the end of the connecting rope 3b. The connecting rope 3a can be the same as that used in FIG. In addition, two support ropes 4 and a pulling rope 9 are also connected to the connecting rope 3a.

Then, while pulling the connecting rope 3b, the pulling rope 9 and the support rope 4 from the second iron tower 10b, the reverse hanging wheel 20 and the protection net 50 are collected. At this time, the connecting rope 3a provided with the hanging wheel 40 is sent out from the first steel tower 10a sequentially at predetermined intervals. When the collection of all the inverted hanging wheels 20 and the protection net 50 is completed in the second tower 10b, as shown in FIG. 7, the second tower 10b is connected to the collector 18 at the end of the connecting rope 3a, and the collection is performed. A vessel 18 is attached to the new line 2. The collecting device 18 has a new line 2 sandwiched between upper and lower rollers, can travel on the new line 2, and has a built-in brake device for maintaining a constant speed during traveling. Then, by pulling the connecting rope 3a in the first tower 10a, the hanging wheel 40 and the recovery device 18 move toward the first tower 10a along the new line 2, and the connecting rope 3a is recovered in the first tower 10a. Is done.

  Thus, the replacement of the electric wire installed between the steel towers 10a and 10b is completed. In this embodiment, when the new line 2 is installed between the steel towers 10a and 10b, and the old line 1 is connected to the steel towers 10a and 10b. In any case when removing from the space, a protective net 50 in a state where a plurality of horizontal ropes 6 are installed at a predetermined interval is provided below the new line 2 or the old line 1 in advance. Even if it is cut, the protection net 50 can catch it, and the protection area on the ground can always be kept in a safe state. In the present embodiment, in the same manner as the conventional reversing suspension car construction method, a plurality of reversing suspension cars are deployed at predetermined intervals along the old line. Since it can arrange | position, the protection net | network 50 can be arrange | positioned efficiently and work efficiency improves also if it sees as the whole electric wire replacement | work. Furthermore, since it is not necessary to install a protective net directly above the ground structure, even if there is not enough space directly above the ground structure, the wire replacement work can be performed with the protective net provided. There is an advantage.

It is a figure which shows the state by which the protection net | network of this embodiment is arrange | positioned under the old line. It is a figure which shows a reversing hanging wheel and its attachment member, (a) shows the protection net holding device comprised by a reversing hanging wheel and its attachment member, (b) shows the opening structure of a reversing suspension wheel. ing. It is a figure which shows the procedure of an electric wire extension method, and is a figure which shows the 1st process (arrangement | positioning process of a connection rope) especially. It is a figure which shows the procedure of an electric wire replacement method, and is a figure which shows the 2nd process (arrangement | positioning process of a reversing suspended wheel and a protection net) especially. It is a figure which shows the procedure of an electric wire replacement method, and is a figure which shows the 3rd process (formation of a protection net and an electric wire replacement process) especially. It is a figure which shows the procedure of an electric wire replacement method, and is a figure which shows the 4th process (The collection | recovery process of a reversing hanging wheel and a protection net) especially. It is a figure which shows the procedure of an electric wire replacement method, and is a figure which shows the 5th process (collection process of a connection rope) especially. It is a figure which shows the up-down inversion operation | movement of a reverse hanging wheel, (a) has shown the state before inversion, (b) has shown the state after inversion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Old line 2 New line 3, 3a, 3b Connection rope 4 Support rope 5 Vertical rope 6 Horizontal rope 9 Pull rope 10, 10a, 10b Steel tower 20 Inverted suspension wheel 21 Upper frame 23 Lower frame 26 Guide member 30 Bean money wheel 50 Protective net 51 Protective net holding device

Claims (3)

From the old tower (1) installed between the two towers (10a, 10b), hang the inverted suspension wheel (20) with the pull rope (9) inserted from one tower (10b) to the other. After sending out a plurality of inverted suspension wheels (20) in the rehabilitation zone, the new wire (2) is connected to one end of the pulling rope (9). In the wire re-stretching method, a new line (2) is placed between two steel towers by pulling the other end in a state of being pulled, the inverted hanging wheel (20) is turned upside down, and the old line (1) is pulled out and removed. ,
A plurality of horizontal ropes (6, ..., 6) are installed between two support ropes (4,4) supported at positions spaced apart from each other across the old wire (1) and a plurality of inversions Two vertical ropes (5,5) are provided for each of the suspension wheels (20), and each of the two vertical ropes (5,5) is a different support rope
(4, 4) holding each inverted suspension wheel (20) in a state where it is held in the tension section,
After deploying the reversing suspension wheel (20) in the tensioning section, tension is applied to the two support ropes (4, 4) so that they are separated from each other. Configuring the protective net (50) in a state of traversing below (1);
An electric wire refurbishing method comprising a step of arranging a new line (2) and removing an old line (1) after forming a protective net (50). The guide member (26) of the inverted hanging wheel (20) having an upper frame (21) and a lower frame (23) and including a guide member (26) connected to the upper frame (21) and the lower frame (23). ) Two vertical ropes (5,5) are slidably attached to the
The old line (1) is inserted into the upper frame (21), and the new line (2) or the pulling rope (9) is inserted into the lower frame (23), and each other with the old line (1) in between Two support ropes (4, 4) provided at a distance from each other are held at the tips of different vertical ropes (5, 5), and are located between the two support ropes (4, 4). A protective net comprising a plurality of horizontal ropes (6, ..., 6) constructed at predetermined intervals. Two support ropes (4, 4) supported at positions spaced apart from each other across the old wire (1) installed between the two towers (10a, 10b);
A plurality of lateral ropes (6, ..., 6) installed between the two support ropes (4,4);
A plurality of inverted suspension wheels (20) arranged at predetermined intervals along the old line;
The inverted hanging wheel (20) includes two vertical ropes (5, 5) each holding a different support rope (4, 4) in a suspended state,
By applying tension to each of the two support ropes (4, 4), a plurality of lateral ropes (6, ..., 6) are stretched so as to cross the lower part of the old line (1). A protective net characterized by being made.