JP2001112131A - Steel tower rebuilding method for aerial transmission limes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel tower working method for aerial transmission lines, which can keep a hot-line sufficiency apart away from a working site, and make construction of a large scale temporary structure and the construction site for temporarily retaining member unnecessary. SOLUTION: A jumper wire of an existing steel tower 1 is detached, and a retaining structure body 5 stretching longer than arm metal is fixed. Aerial transmission lines 2 are connected, by using a jumper line 6 having a prescribed length. The jumper line 6 is retained by the retaining structure body 5. A wire- retaining line 3 is connected with a porcelain insulator 9 retained on both ends of the arm metal 4. The wire retaining line 3 is retained by an existing steel tower 1 so as to be sent out. The porcelain insulator 9 is detached from the arm metal 4. The aerial transmission line 2 is drawn, and a newly building steel tower is constructed in such a manner as wrapping the existing steel tower 1. After the porcelain insulator from, which the wire-retaining line 3 is detached, is retained by the arm metal of the newly building steel tower, the existing steel tower is dismantled together with the retaining structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rebuilding an overhead power transmission line with a steel tower, and more particularly to a method for rebuilding a steel tower, in which a live line portion can be sufficiently moved away from a construction site and a large-scale temporary support structure can be used. The present invention relates to a method of rebuilding an overhead power transmission line that does not require construction and a construction site for temporary supports.

[0002]

2. Description of the Related Art A power outage caused by the rebuilding of an overhead power transmission line in a tower has a great effect on the field of electricity utilization. Therefore, the time of the power outage needs to be minimized. On the other hand, during the rebuilding of the tower, it is necessary to ensure the safety of workers from electric shock accidents.

[0003] For this reason, various methods have been proposed for rebuilding an overhead power transmission line while rebuilding a tower while maintaining electrical connection while isolating a construction site from live parts at least to a certain extent.

FIG. 13 shows a first conventional method of rebuilding a tower, in which an existing tower 1 and a temporary tower 41 are constructed on a site at least a certain distance from the site for rebuilding, and the existing tower 1 is connected to the existing tower 1 until then. The power transmission route was transferred to a temporary steel tower 41, and after completing the necessary construction work, the power transmission route was returned again.

FIG. 14 shows a second conventional method of rebuilding a steel tower, in which an existing steel tower 1 has an arm 42 longer than an existing arm 4.
After relocating the transmission line 2 from the existing arm 4 and circumventing the power transmission route, construct a new tower by wrapping it around the outside of the existing tower, and finally remove the existing tower to replace the tower. And returned the power transmission route again. In the second method, it is not necessary to construct a large-scale temporary structure such as a temporary steel tower, thereby reducing costs associated with the construction,
There are advantages that the construction period can be shortened, and that a construction site for a temporary steel tower is not required.

FIG. 15 shows a third conventional method for rebuilding a tower, in which a wire support wire 3 is inserted between a support point 43 of an existing tower 1 and a transmission line 2, and both spans sandwiching the existing tower 1 are installed. Was electrically connected by attaching a long jumper wire 6, and the long jumper wire 6 was transferred to an existing steel tower 1 and a temporary support 44 constructed on a site at least a certain distance from the rebuilding site. Later, a new tower was constructed to wrap around the outside of the existing tower, and finally the existing tower was removed and rebuilt, and the power transmission route was returned again.

[0007] In the third method, the hot-line part can be sufficiently distant from the construction site, the safety of workers can be sufficiently ensured, and a large-scale temporary structure is not required. The cost can be reduced and the construction period can be shortened.

[0008]

However, according to the first method, despite the provisional power transmission route using the temporary tower 41, the scale of the construction is large, so the construction of the temporary tower and the replacement of the transmission line are required. However, there is a problem that the cost is increased due to the above-mentioned reasons, and the construction period is prolonged. In addition, there was a problem that a construction site for a temporary steel tower was required.

In addition, according to the second method, since the transmission line is directly supported by the newly-installed long arm 42, the length of the newly-installed long arm 42 cannot be more than a certain length due to the strength. For this reason, the live part cannot be kept sufficiently away from the construction site, and the safety of workers has not been sufficient.

Further, according to the third method, the construction site is required to construct the temporary support 44.

Accordingly, it is an object of the present invention to provide a method for constructing a large-scale temporary structure and a temporary support structure in which a live-line portion can be sufficiently moved away from a construction site when rebuilding an overhead power transmission line. An object of the present invention is to provide a method for rebuilding an overhead power transmission line in a tower, which does not require a construction site.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides the following method for rebuilding an overhead power transmission line.

[1] In the method of rebuilding an existing tower supporting an overhead transmission line to a new tower without changing the position of the tower, and relocating the overhead transmission line to the new tower and supporting the tower, Remove the jumper wire of the tower and attach a support structure extending beyond the arm bar, connect the overhead power transmission lines on both sides of the arm bar with jumper wires of a predetermined length, and connect the jumper wire to the support structure. Supported by an object, while connecting a wire support wire to the insulator device supported on both sides of the arm, and supporting the wire support wire so that it can be sent out by the existing steel tower,
While removing the insulator device from the arm, the overhead transmission line is drawn from adjacent towers on both sides of the existing tower, and the new tower is constructed so as to wrap the existing tower,
A method of rebuilding a tower of an overhead transmission line, comprising: supporting the insulator device from which the wire support wire has been detached on a arm of the new tower, and disassembling the existing tower together with the support structure. [2] The connection of the electric wire support wire to the insulator device is performed by connecting a steel stranded wire connected to a wire sent out from a winch placed on the ground via a pulley, [1]. How to rebuild overhead power transmission lines. [3] The drawing of the overhead transmission line from the adjacent tower is performed by removing the insulator device supported by the arm of the adjacent tower, removing the support of the overhead transmission line from the arm of the adjacent tower, and moving the overhead transmission line to the ground. The method for rebuilding an overhead power transmission line according to [1], wherein the overhead transmission line is pulled by a wire drawn from a placed winch via a pulley. [4] The pulling of the overhead power transmission line from the adjacent tower is performed after the pulling of the overhead power transmission line is completed and the jumper wire is supported via an insulator device in a state where overhead wire tension of the overhead power transmission line is not applied. The method according to [1], wherein the overhead power transmission line is supported by a structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory diagram schematically showing an outline of an embodiment of a tower rebuilding method according to the present invention. 2 to 7 are explanatory views schematically showing one embodiment of the method for rebuilding a tower according to the present invention in the order of steps.

As shown in FIGS. 1 to 7, the method for rebuilding a tower according to the present invention includes the following steps: (1) detaching a jumper wire 8 of an existing tower 1 and attaching a predetermined support structure 5; , Connection of the jumper wire 6 by the support structure 5, (3) connection of the wire support wire 3 to a predetermined insulator device 9, and existing tower of the wire support wire 3 (4) Insulator device 9
(5) Construction of a new steel tower 31 to be carried out so as to wrap the existing steel tower 1 and (6) Armature 32 of the new steel tower 31 And (7) dismantling the existing tower 1 and the supporting structure 5 to construct the new tower 31.

Hereinafter, an embodiment of the rebuilding method of the present invention will be described more specifically in the order of steps.

(1) First Step As shown in FIG. 2, a jumper wire 8 and an insulator device 9 are provided on an existing steel tower 1 before the tower rebuilding work. An insulator device 23 is provided. Between the towers, transmission line 2 has three phases (upper, middle,
Lower phase) provided, respectively, the insulator device 9 and the insulator device 2
The arm 3 supports the arm 4 and the arm 27.
As shown in FIG. 3, the lower phase jumper wire 8 shown in FIG. 2 is removed from the existing steel tower 1, and a longer supporting structure (steel prism, 8 m long) 5 is attached to the existing arm 4. Installed. As shown in FIG. 4, adjacent towers 2 on both sides of the existing tower 1
In FIG. 1, the jumper wire 22 and the insulator device 23 shown in FIG. 2 were removed.

(2) Second and Third Steps As shown in FIG. 5, a long jumper wire (about 35 m in length) 6 is connected to the transmission line 2 in the existing steel tower 1 and the pulley 10 ( a), and a wire support wire (steel stranded wire, length of about 15 m) 3 is connected to the insulator device 9,
The wire 11 supported by the pulley 10 (b) was connected to the end of the wire support wire 3, and the wire 11 was charged into the winch 12.

(4) Fourth Step As shown in FIG. 6, a wire 25 supported by a pulley 24 was connected to an end of the transmission line 2 at an adjacent steel tower 21 and charged into a winch 26. As shown in FIG. 7, in the existing steel tower 1, the support of the insulator device 9 in the arm 4 is released, and the wire 25 is wound up in the adjacent steel tower 21 while sending out the wire 11.
The wire 11 was sent out until it moved about m. As shown in FIG. 8, an insulator device 23 was attached to the transmission line 2 at the adjacent steel tower 21, supported by the arm 27, and the jumper wire 22 was connected.
In the existing tower 1, an electric wire support wire (steel stranded wire, length of about 15 m) 3 is attached to the arm 4, and an insulator device 7 is attached to the tip of a support structure (steel prism, length 8 m) 5. Thus, the long jumper wire 6 was supported. As shown in FIG.
The middle and upper phases were performed in the same manner as in the above (2) to (6).

(5) Fifth Process As shown in FIG. 10, a new steel tower 31 was constructed so as to surround the existing steel tower 1 from outside.

(6) Sixth Step As shown in FIG. 11, the electric wire support wire 3 shown in FIG. 10 is removed from the existing steel tower 1, and the long jumper wire 6 is cut into a predetermined length. 9 and the jumper line 6 to the new tower 3
Then, the insulator arm 9 and the jumper wire 6 were attached.

(7) Seventh Step As shown in FIG. 12, the existing steel tower 1 and the supporting structure 5 shown in FIG. 11 were removed, and the rebuilding of the steel tower was completed.

[0023]

As described above, according to the method for rebuilding a steel tower according to the present invention, the construction of a large-scale temporary structure such as a temporary steel tower and the construction site for a temporary steel tower and a support structure which are conventionally required become unnecessary. Therefore, it is possible to reduce the construction cost and the construction period. In addition, according to the present invention, it is possible to keep the live line portion sufficiently distant from the construction site in terms of electrical safety, and it is possible to sufficiently secure the safety of workers.

[0024]

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an outline of an embodiment of a method for rebuilding a tower according to the present invention, wherein (a) is a plan view and (b)
Is a front view.

FIG. 2 is an explanatory view schematically showing a state of an existing steel tower before a steel tower rebuilding work in one embodiment of the steel tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 3 is an explanatory view schematically showing a first step in an embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 4 is an explanatory view schematically showing a first step in an embodiment of the method for rebuilding a tower according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 5 is an explanatory view schematically showing the second and third steps in one embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 6 is an explanatory view schematically showing a fourth step in one embodiment of the method for rebuilding a tower according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 7 is an explanatory view schematically showing a fourth step in the embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 8 is an explanatory view schematically showing a fourth step in one embodiment of the method for rebuilding a tower according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 9 is an explanatory view schematically showing a fourth step in the embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 10 is an explanatory view schematically showing a fifth step in one embodiment of the method for rebuilding a tower according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 11 is an explanatory view schematically showing a sixth step in one embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 12 is an explanatory view schematically showing a seventh step in one embodiment of the tower rebuilding method of the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 13 is an explanatory diagram schematically showing a first method of rebuilding a conventional tower.

FIG. 14 is an explanatory view schematically showing a second conventional method of rebuilding a steel tower.

FIG. 15 is an explanatory diagram schematically showing a third method of rebuilding a conventional tower.

[Explanation of symbols]

 1. Existing tower 2. Transmission line 3. Wire support wire 4. Arms (existing steel tower) 5. 5. Support structure (existing steel tower) 6. Long jumper line (existing steel tower) 7. Insulator device (support structure) 8. Existing jumper line (existing steel tower) Insulator device (existing steel tower) 10 (a). Pulley (existing steel tower) 10 (b). Pulley (existing steel tower) Wire (existing steel tower) 12. Winch (existing steel tower) 21. Adjacent tower (tower adjacent to existing tower) Jumper line (adjacent tower) 23. Insulator device (adjacent tower) 24. Pulley (adjacent tower) 25. Wire (adjacent tower) 26. Winch (adjacent tower) 27. Arms (adjacent tower) 31. New steel tower 32. Arms (new tower) 41. Temporary steel tower 42. Long arm 43. Support point (existing steel tower) Temporary support (constructed on land)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Yamada 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside the Toyoura Plant of Hitachi Cable Co., Ltd. (72) Inventor Tomokazu Shibata 3-5-Higashishinagawa, Shinagawa-ku, Tokyo No. 10 Inside Hitachi Cable Power Systems Co., Ltd. (72) Inventor Tomohiro Kagami 4-1-1 Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside the Toyoura Plant of Hitachi Cable Co., Ltd.

Claims (4)

[Claims] 1. A method for rebuilding an existing tower supporting an overhead transmission line to a new tower without changing the position of the tower, and transferring the overhead transmission line to the new tower to support the tower, And attaching a support structure extending beyond the arm bar, connecting the overhead power transmission lines on both sides of the arm bar with jumpers of a predetermined length, and connecting the jumper line to the support structure. A wire support line is connected to the insulator device supported on both sides of the arm bar, and the wire support line is supported so that it can be sent out by the existing steel tower, and the insulator device is supported from the arm bar. Remove and draw the overhead transmission line from adjacent towers on both sides of the existing tower, construct the new tower so as to wrap the existing tower, After supporting the insulator devices remove the feeder support wire, steel tower rebuilding method of overhead power lines, characterized in that dismantling the existing steel tower together with the support structure. 2. The connection of the electric wire support wire to the insulator device is performed by connecting a steel stranded wire connected to a wire sent out from a winch placed on the ground via a pulley. How to rebuild the overhead power transmission line as described. 3. The drawing of the overhead transmission line from the adjacent tower is performed by removing the insulator device supported by the arm of the adjacent tower, removing the support of the overhead transmission line from the arm of the adjacent tower. The method for rebuilding an overhead power transmission line tower according to claim 1, wherein the overhead transmission line is pulled by a wire pulled from a winch placed on the ground via a pulley. 4. The pulling of the overhead power transmission line from the adjacent tower is performed through an insulator device after the pulling of the overhead power transmission line is completed and the jumper wire is not subjected to overhead wire tension of the overhead power transmission line. The method according to claim 1, wherein the overhead transmission line is supported by the support structure.