JP4354055B2 - Overhanging method for overhead ground wire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for replacing an overhead ground wire for replacing an existing overhead ground wire already stretched between steel towers with a new overhead ground wire.
[0002]
[Prior art]
With the spread of optical communication technology, an attempt has been made to use an overhead ground wire stretched between steel towers for optical communication. In this case, it is necessary to replace the already installed overhead ground wire with an overhead ground wire (OPGW) including an optical fiber line, for example.
[0003]
The overhead ground wire used in the above case is generally replaced by releasing the fixing of the existing overhead ground wire to the steel tower and replacing the existing overhead ground wire with the new overhead ground wire. More specifically, the existing overhead ground wire that was fixed near the top of the tower was released and transferred to the supporter, and the existing overhead ground wire on the supporter was newly installed using a windmill carrier, etc. It is normal to replace the overhead ground wire by replacing it with an overhead ground wire.
[0004]
However, in reality, it is not easy to replace the overhead ground wire. In order to replace the overhead ground wire, it is necessary to pay close attention not to contact the existing overhead ground wire or the newly installed overhead ground wire with the power transmission line, which requires excessive labor. .
[0005]
When the overhead ground wire is replaced by a steel tower with armrests on both sides, the current supply to one of the transmission lines suspended from the armrests on both sides is stopped to A technique that alleviates the difficulty of position control is adopted. However, some steel towers are called narrow-line steel towers with short arm lengths. In such a narrow-line steel tower, even if the above-described method for stopping the current supply is used, the overhead ground Since it is almost impossible to maintain a non-contact state between the power line and the power transmission line, the overhead ground wire has not been replaced. If current supply is stopped for both transmission lines on both sides, it will be possible to replace the overhead ground wire even in the narrow towers, but this means a complete stop of the power supply, so a realistic solution It cannot be.
[0006]
As described above, the difficulty in changing the overhead ground wire is great, and the time required for the replacement of the overhead ground wire tends to be long due to the difficulty. Since the extension of the overhead ground wire replacement work directly leads to the extension of the period during which power cannot be supplied in a complete form, a technique capable of easily and quickly changing the overhead ground wire is desired. In particular, in the steel tower between narrow lines, since the technical difficulty is too high, the overhead ground wire itself is not replaced.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to provide an overhead ground wire replacement method that can be easily and quickly replaced in an overhead ground wire and that can be carried out on a steel tower between narrow wires.
[0008]
[Means for Solving the Problems]
The overhead ground wire replacement method according to the present invention for solving the above problem replaces an existing overhead ground wire that is stretched over the top of a steel tower with a transmission line suspended by a metal arm on both sides with a new overhead ground wire. The basic method is a method of replacing the overhead ground wire, including the process. Then, by stopping the power supply, the step of setting one side of the transmission line as a current stop line, and the existing overhead ground line that has been unfixed between the towers is stopped in the overhead ground line replacement section. A step of projecting to the outside of the wire, and a step of replacing the existing overhead ground wire that is projected to the outside of the current stop line with a new overhead ground wire.
[0009]
In this construction method, an existing overhead ground wire that has been fixed between each tower is extended to the outside of the current stop line, and the outside of the current stop line (in this specification, “outside of the current stop line” is ”Means the side of the current stop line far from the steel tower.) The existing overhead ground wire overhanging to the new overhead ground wire will be replaced. Therefore, according to the method of replacing the overhead ground wire, the distance between the overhead ground wire and the transmission line on the side where the current is not stopped is long, and the current stop line is located on the side where the current is not stopped. By functioning as a barrier that prevents interference with the power transmission line, the possibility of contact between the overhead ground wire and the power transmission line that has not stopped the current can be reduced as much as possible when the overhead ground wire is replaced.
[0010]
As described above, this overhead ground wire extension method requires that the existing overhead ground wire, which has been unfixed between the towers, be extended to the outside of the current stop line. The extension of the existing ground wire from the current stop line to the outside may be performed by any method, but the overhead wire can be supported at the tip and formed longer than the horizontal length of the armrest. This can be carried out using a derrick provided with an arm and a fixing means that supports the base end portion of the arm so as to be rotatable and can be fixed to a steel tower. The derrick is fixed to each steel tower, and the arm that supports the existing overhead ground wire that has been fixed between the steel towers at the tip is rotated in the horizontal direction, and the existing overhead ground wire is By projecting outside the current stop line, the overhead ground wire can be easily projected outside the current stop line.
[0011]
Any existing construction method can be used to replace an existing overhead ground wire with a new overhead ground wire according to the present invention. For example, a first pulley for moving on the overhead ground wire in a suspended state on the existing overhead ground wire extending outside the current stop line, and a second pulley for supporting another overhead ground wire, A step of disposing a wind turbine carrier provided with a predetermined interval, a step of extending the new overhead ground wire while being guided by the second pulley of the wind turbine carrier, and the extended new overhead ground A step of supporting the wire with the supporters of the steel towers located at both ends of the re-covering section, and suspending each windmill carrier on the newly installed overhead ground wire with the second pulley, and existing on the first pulley of the windmill carrier A new installation of the existing overhead ground wire is performed by performing a step of supporting the overhead ground wire, a step of pulling out the existing overhead ground wire while being guided by the first pulley, and a step of collecting each windmill carrier. Replacement to an imaginary ground wire can be performed. The windmill carrier can travel on the overhead ground wire, and can get over the obstacle when there is an obstacle on the overhead ground wire. Therefore, the method of supporting the existing overhead ground wire with the derrick arm and the method of using the windmill carrier are particularly compatible with each other.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to the drawings, an embodiment of an overhead ground wire replacement method according to the present invention will be described.
[0013]
The overhead ground wire replacement method according to this embodiment is a tower 10 as shown in FIG. 1, that is, three armatures 11 are provided on both sides of the tower 10, and the transmission line Y is suspended at the tip of each armrest 11. It is used when the existing overhead ground wire X1 supported at the top of the 11-type steel tower 10 supported by the lowering is replaced.
[0014]
In performing the replacement of the existing aerial ground wire X1, first, one side of the transmission line Y is set as the current stop line Y1 by stopping the power supply. Next, as shown in FIG. 2, the derrick 20 is attached to the base portion of the arm metal 11 on the side where the current stop line Y1 of each steel tower 10 is suspended in the replacement section where the existing overhead ground wire X1 is replaced. To fix.
[0015]
Here, the derrick 20 will be described. The derrick 20 includes an end derrick 20a for attaching to the steel tower 10 located at both ends of the re-covering section, and a general derrick 20b for attaching to the steel tower 10 located at parts other than both ends of the re-covering section. There are two types. The structure of the end derrick 20a is as shown in FIGS. 3 and 4, and the structure of the general derrick 20b is as shown in FIGS.
[0016]
The end derrick 20a includes an arm 30a and a base 40a as a fixing means. The arm 30a includes two arm members 31a assembled so as to be V-shaped, a connecting rod 32a attached to the tip of the arm member 31a, and a connecting plate 33a attached to the connecting rod 32a. And a rotating member 34a formed by a round pipe, each attached to the base end of both arm members 31a. A connection piece 36a provided with a connection hole 35a for chain connection is attached to the upper surface of the arm 30a.
[0017]
The base 40a includes a shaft 41a formed of a round pipe corresponding to the inner surface shape of the rotating member 34a, two sets of positioning members 42a fixed to the shaft 41a, and two fixed members 42a. Part 43a. The positioning member 42a is formed in a ring shape that follows the shape of the outer peripheral surface of the shaft 41a, and includes a bolt 44a that passes through the positioning member 42a and is screwed into a screw hole (not shown) formed in the shaft 41a.
[0018]
The positioning member 42a is fixed by a bolt 44a penetrating the shaft 41a so that the tip position of the arm 30a corresponds to the center position of the shaft 41a. The fixing portion 43a includes two U-shaped bolts 45a, an adjusting member 46a, a nut 47a, a connecting piece 48a, a fixing piece 49a, and a fixing bolt 50a arranged in parallel. The U-shaped bolt 45a is formed by bending a bolt threaded at both ends into a curvature that can hold the shaft 41a at the center. The adjusting member 46a has a hole (not shown) for penetrating the U-shaped bolt 45a, and can be fixed to the end of the U-shaped bolt 45a by a nut 47a. Further, the connecting piece 48a includes two holes (not shown) for penetrating the U-shaped bolt 45a, and is fixed at the fixing member 49a and one end thereof. In addition, although illustration is abbreviate | omitted, the auxiliary | assistant bolt is provided in the state which penetrates the fixing member 49a between each U-shaped volt | bolt 45a linear part. The adjusting member 46a is provided with holes for penetrating the auxiliary bolts, and an auxiliary nut (not shown) can be screwed onto the tip of the auxiliary bolt protruding from the hole. These auxiliary bolts and auxiliary nuts are for assisting in fixing the angle A by a fixing bolt 50a described later.
[0019]
The fixing member 49a has a substantially U-shaped cross section. The fixing member 49a on the side close to the shaft 41a has a curved surface along the outer peripheral surface of the shaft 41a, and is stable by being brought into contact with the shaft 41a. In particular, three contact members 51a that support the shaft 41a are fixed. The fixing bolt 50a is a bolt that passes through a hole (not shown) provided in the adjusting member 47a, and a dish-like contact piece 52a is caulked to one end thereof. Further, a screw nut 53a is attached to the other end of the fixing bolt 50a, and the distance between the contact piece 52a and the fixing member 49a can be adjusted by adjusting the tightening amount of the nut 53a. It has become.
[0020]
The general derrick 20b has substantially the same configuration as the end derrick 20a. That is, the general derrick 20b includes an arm 30b and a base 40b as fixing means. However, the general derrick arm 30b is composed of one arm member 31b. A connection piece 36b provided with a connection hole 35b for chain connection is attached to the upper surface of the arm 30b. A ring 33b is attached to the tip of the arm member 31b via a connection plate 32b. Further, a rotating member 34b formed by a round pipe is attached to the base end portion of only one arm member 31b.
[0021]
The structure of the base 40b of the general derrick 20b is substantially the same as that of the end derrick 20a. That is, the base 40b includes a shaft 41b, a positioning member 42b, and a fixing portion 43b similar to the case of the end derrick 20a. The positioning member 42b is formed in a ring shape along the outer peripheral surface of the shaft 41b, and includes a bolt 44b that is screwed into a screw hole (not shown) formed in the positioning member 42b. The positioning member 42b in the general derrick 20b can be fixed to an arbitrary portion of the shaft 41b by tightening the bolt 44b. Therefore, the rotating member 34b can be fixed at an arbitrary position in the length direction of the shaft 41b by sandwiching the rotating member 34b between the positioning members 42b fixed at predetermined positions. The fixed portion 43b of the general derrick 20b is the same as the fixed portion 43a of the end derrick 20a. That is, a U-shaped bolt 45b, an adjusting member 46b, two nuts 47b, a connecting piece 48b, two fixing members 49b, and a fixing bolt 50b are provided. In addition, although illustration is abbreviate | omitted, the auxiliary | assistant bolt and the auxiliary | assistant nut are provided between the linear parts of a U-shaped volt | bolt. A contact member 51a is fixed to the fixing member 49b, a dish-shaped contact piece 52b is attached to one end of the fixing bolt 50b, and a nut 53b is attached to the other end.
[0022]
And how to attach derrick 20 to steel tower 10 is as follows. Since the end derrick 20a and the general derrick 20b are attached in common, only the general derrick 20b will be described. In order to attach the general derrick 20b to the steel tower 10, first, the adjusting members 46b are removed from the U-shaped bolts 45b, the fixing bolts 50b, and the auxiliary bolts by removing the nuts 47b and 53b and the auxiliary nuts (not shown). Next, an angle A having an L-shaped cross section constituting the steel tower 10 is inserted into the gap between the U-shaped bolts 45b from the portion from which the adjusting member 46b has been removed. Next, the adjusting member 46b is fitted to the U-shaped bolt 45b and the fixing bolt 50b, and the nut 53b is closed, whereby the angle A is sandwiched between the contact piece 52b at the tip of the fixing bolt 50b and the fixing member 49b. Further, the positional relationship between the adjusting member 46b and the fixing member 49b is maintained by the auxiliary bolt and the auxiliary nut. In addition, the nut 53b is tightened with respect to the fixing bolt 50b, the nut 47b is tightened with respect to the U-shaped bolt 45b, and an auxiliary nut (not illustrated) is tightened with respect to the unillustrated auxiliary bolt, and an excessive load is applied to the adjusting member 46b. Try to prevent that.
[0023]
Next, in the general derrick 20b, the positioning member 42b is shifted to a desired position on the shaft 41b, and is fixed to the shaft 41b by tightening the bolt 44b. In this way, the rotating member 34b is positioned.
[0024]
Next, the tip of the wire W extending from the winch U fixed near the top of the steel tower 10 is connected to the lever hoist 70. The lever hoist 70 includes a hoist 71, a lever 72, and a chain 73, and a wire W <b> 1 is connected to the hoist 71. The chain 73 is connected to the connection hole 35b at the tip of the arm 30b. By holding the lever 72 and performing the operation, the arm 30b can be easily rotated.
[0025]
Next, the existing overhead ground wire X1 is supported by the ends of the arms 30a and 30b of each end derrick 20a and general derrick 20b. Prior to support, a support device 80 capable of supporting an aerial ground wire is attached to the tip of the arm 30b via a metal fitting 85, and the existing aerial ground wire X1 can be supported by the support device 80. In this state, the arms 30a and 30b are in a substantially vertical direction.
[0026]
Next, the arms 30a and 30b of each derrick 20 are rotated in the horizontal direction. As a result, the existing overhead ground wire X1 is projected outside the current stop line Y1 as shown in FIG.
[0027]
In this state, the existing overhead ground wire X1 is replaced with the new overhead ground wire X2. This newly installed overhead ground wire X2 is OPGW.
[0028]
The replacement work of the existing overhead ground wire X1 to the new overhead ground wire X2 is not limited to this, but can be performed using the technique shown in FIG.
[0029]
When replacing the existing aerial ground wire X1 with the new aerial ground wire X2, the wind turbine carrier 90 is first deployed (FIG. 7A). Specifically, the wind turbine carriers 90 are connected in a row at predetermined intervals using the connecting rope W, and the wind turbine carriers 90 are capable of traveling on an imaginary ground wire by themselves by incorporating a power source. By pulling with, it arrange | positions on the existing overhead line X1 at predetermined intervals. The windmill carrier 90 may be a general one as shown in, for example, Japanese Patent Laid-Open Nos. 62-110413 and 62-260507, and a first pulley 90A for moving on an overhead ground wire in a suspended state, The second pulley 90B for supporting another overhead ground line and any obstacle on the overhead ground line may be used.
[0030]
Next, the newly installed overhead ground wire X2 is extended (FIG. 7B). Specifically, the front end of the newly installed overhead ground wire X2 is pulled by the leading device 92 and the retracting device 93, and the second pulley 90B of the continuously arranged windmill device 90 is used as a guide while the drum frame is used. The new aerial ground wire X2 is drawn from 95. On the other hand, the connecting rope R is pulled out from the reel winder 94, and the tension of the connecting rope R connecting the windmill transporter 90 is kept constant.
[0031]
Next, the support of the existing overhead wire X1 at the tips of the arms 30a, 30b of the derrick 20 attached to each steel tower 10 is released, and the new overhead wire X2 is supported at the tips of the arms 30a, 30b. As a result, the positional relationship between the new overhead ground line X2 and the existing overhead ground line X1 is reversed, and the existing overhead ground line of the first pulley 90A of the windmill transporter 90 is suspended from the new overhead ground line X2 by the second pulley 90B. X1 is in a supported state. Then, from this state, the existing overhead ground wire X1 is pulled out by the drum mount 95 while being guided by the first pulley 90A of the windmill transporter 90 (FIG. 7C). Further, the wind turbine carrier 90 is recovered by winding the connecting rope R with the reel winder 94 (FIG. 7D). The operations shown in FIGS. 7C and 7D can be performed simultaneously.
[0032]
Thus, the replacement of the existing overhead ground wire X1 with the new overhead ground wire X2 is completed.
[0033]
Then, the arms 30a and 30b of the derrick 20 supporting the newly installed overhead ground wire X2 are rotated in the vertical direction, and the newly installed overhead ground wire X2 is fixed to the portion of the tower 10 where the existing overhead ground wire is fixed. This completes the replacement of the overhead ground wire.
[0034]
【The invention's effect】
In the construction method of the overhead ground wire of the present invention, the replacement work of the existing overhead ground wire to the new overhead ground wire is performed after the existing overhead ground wire is extended outside the current stop line. In performing the replacement work, the overhead ground wire does not come into contact with the transmission line that has not stopped the current. Therefore, the difficulty in work in changing the overhead ground wire is reduced, and the construction period can be shortened. In addition, if a derrick is used in this overhead ground wire replacement method, the existing overhead ground wire can be easily extended to the outside of the current stop line.
[Brief description of the drawings]
FIG. 1 is a diagram showing a simplified structure of a steel tower in which an overhead ground wire replacement method according to an embodiment of the present invention is implemented.
FIG. 2 is a diagram schematically showing an explanation of an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 3 is a plan view showing a structure of an end derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 4 is a side view showing a structure of an end derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 5 is a bottom view showing a structure of a general derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 6 is a side view showing a structure of a general derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 7 is a diagram showing an example of a process of replacing an existing overhead ground wire with a new overhead ground wire by the overhead ground wire replacement method according to one embodiment of the present invention.
[Explanation of symbols]
10 steel tower 11 arm metal 20 derrick 30a, 30b arm 40a, 40b base (fixing means)
70 lever hoist 90 windmill carrier

Claims (1)

This is an overhead ground wire replacement method that includes the process of replacing an existing overhead ground wire that is stretched over the steel tower, which is a steel tower between two narrow lines, with suspension wires on both sides. And
A step of making one side of the transmission line a current stop line by stopping power supply; and
Extending the existing overhead ground wire that has been fixed between each steel tower to the outside of the current stop line in the overhead ground wire replacement section; and
Replacing the existing overhead ground wire extending outside the current stop line with a new overhead ground wire;
A method of redrawing an imaginary ground wire including
The step of extending the existing overhead ground wire, which has been fixed between each tower, to the outside of the current stop line in the overhead ground wire replacement section,
An aerial ground wire can be supported at the tip and formed longer than the horizontal length of the arm metal, and is rotatable between a substantially vertical position and a substantially horizontal position; and A V-shaped arm configured to have a substantially V shape whose base end side is widened when viewed in plan in a substantially horizontal state , and a base end portion of the V-shaped arm are rotatably supported and fixed to a steel tower. And fixing the end derricks to the steel towers located at both ends of the overhead ground wire replacement section, and supporting the overhead ground wire at the distal end and in the horizontal direction of the arm metal A straight line that is formed longer than the length, is rotatable between a substantially vertical position and a substantially horizontal position, and has a substantially straight shape when viewed in plan in a substantially horizontal state. The arm and the base end of the linear arm are supported rotatably. A fixing means which is to be fixed to the pylon, the general derrick provided with a step of fixing the tower other than those positioned at both ends of the ground wire replacement interval,
The existing aerial ground wire that has been unfixed between the steel towers, the tip of the V-shaped arm of the end derrick, each of which is positioned at a substantially vertical position, and the straight line of the general derrick The arm is supported by the tip of the arm, and both of which rotate the V-shaped arm that supports the overhead ground wire at the tip and the linear arm to a substantially horizontal position using a lever hoist . By extending the existing overhead ground wire to the outside of the current stop line,
Only including,
The step of replacing the existing overhead ground wire extended outside the current stop line with a new overhead ground wire,
A first pulley for moving on the overhead ground wire in a suspended state and a second pulley for supporting another overhead ground wire are provided on the existing overhead ground wire that extends outside the current stop line. Arranging the windmill transporter at a predetermined interval;
Extending the newly installed ground wire while guiding with the second pulley of the windmill carrier;
Supporting the extended overhead ground wire extended at the tip of the V-shaped arm of the end derrick fixed to a steel tower located at both ends of the overhead ground wire re-spanning section;
Suspending each windmill transporter on the newly installed overhead ground line with the second pulley and supporting the existing overhead groundline on the first pulley of the windmill transporter;
Pulling out the existing overhead ground wire while guiding with the first pulley;
Recovering each windmill transporter;
including,
Overhanging method for overhead ground wire.

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