JP3514189B2 - How to rebuild overhead power transmission lines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rebuilding a steel tower of an overhead power transmission line, and more particularly to a method of rebuilding a steel tower in which a live line portion can be sufficiently separated from a construction site and a large-scale temporary support. The present invention relates to a method of constructing and rebuilding a steel tower of an overhead transmission line that eliminates the need for a construction site for temporary support.

[0002]

2. Description of the Related Art A power outage caused by rebuilding a steel tower of an overhead power transmission line has a great influence in the field of electricity utilization. Therefore, the power outage time should be minimized. On the other hand, it is necessary to secure the safety of workers from an electric shock accident during the construction work to rebuild the tower.

For this reason, when rebuilding a steel tower of an overhead power transmission line, various methods have been proposed in which the construction site is separated from the live line portion by a certain amount or more while the electrical connection is secured, and the tower is rebuilt.

FIG. 13 shows a first method of rebuilding a conventional steel tower, in which an existing steel tower 1 and a temporary steel tower 41 are constructed at a site separated by a certain amount or more from the site for the rebuilding, and the existing steel tower 1 is used until then. The existing power transmission route was transferred to the temporary steel tower 41, and after the required steel tower rebuilding work was completed, the power transmission route is returned again.

FIG. 14 shows a second method of rebuilding a conventional steel tower, in which an armor 42 longer than the armor 4 already installed in the existing steel tower 1 is used.
After installing the power transmission line 2 from the existing arm 4 to bypass the power transmission route, a new steel tower is constructed by wrapping it from the outside of the existing steel tower, and finally the existing steel tower is removed to rebuild the steel tower. The power transmission route has been restored again. This second method eliminates the need for constructing a large-scale temporary structure such as a temporary steel tower, reducing the cost associated with the construction,
It has the advantages that the construction period can be shortened and that the construction site for the temporary steel tower is unnecessary.

FIG. 15 shows a third conventional method of rebuilding a steel tower, in which an electric wire support wire 3 is inserted between a support point 43 of the existing steel tower 1 and a power transmission line 2 so as to sandwich the existing steel tower 1. Was installed and electrically connected with the elongated jumper wire 6, and the elongated jumper wire 6 was transferred to the existing steel tower 1 and the temporary support 44 constructed on a site separated from the site for rebuilding by a certain amount or more. After that, a new steel tower was constructed by wrapping it from the outside of the existing steel tower, and finally the existing steel tower was removed and the steel tower was rebuilt, and the power transmission route was restored again.

In the third method, the live line part can be sufficiently separated from the construction site, the safety of workers can be sufficiently ensured, and a large-scale temporary structure is not required, so that the construction work The cost can be reduced and the construction period can be shortened.

[0008]

However, according to the first method, the construction scale is large despite the temporary power transmission route using the temporary steel tower 41. Therefore, the construction of the temporary steel tower and the replacement of the transmission line are performed. There was a problem that the cost due to such reasons would be high and the construction period would be long. There was also a problem that a construction site for temporary steel towers was required.

Further, 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 set to a certain length or longer. For this reason, the live line part cannot be sufficiently moved away from the construction site, which is not sufficient in terms of worker safety.

Further, according to the third method, since the temporary support 44 is built, its construction site is required.

Therefore, an object of the present invention is to construct a large-scale temporary structure and a temporary support which can sufficiently keep the live line part away from the construction site during the reconstructing work of the overhead power transmission line tower. An object of the present invention is to provide a method for rebuilding a steel tower of an overhead transmission line that does not require a construction site.

[0012]

In order to achieve the above object, the present invention provides the following method of rebuilding a steel tower of an overhead power transmission line.

[1] The existing steel tower supporting the overhead power transmission line is rebuilt into a new steel tower without changing the position of the steel tower, and the overhead power transmission line is transferred to the new steel tower to be supported by the existing steel tower rebuilding method. existing iron from elongated support structure that cross-arm with removing the jumper wire tower
An insulator that is attached to a tower and connects the overhead power transmission lines on both sides of the arm with a jumper wire having a predetermined length, supports the jumper wire with the support structure, and is supported on both sides of the arm. as well as connecting the device at the power line support line, its
Connect the wire to the electric wire support wire and send out the wire
The electric wire support wire from the existing steel tower on both sides of it.
Supported on the existing steel tower side so that it can be sent to the adjacent steel tower ,
Before being drawn the overhead line the insulator apparatus from both sides of the adjacent towers of the existing steel towers with removed from the cross-arm
Use the wire to connect the electric wire from the existing tower side to the adjacent towers on both sides.
After sending out a supporting wire for a predetermined length, the new steel tower is constructed so as to wrap the existing steel tower, and after supporting the insulator device with the electric wire support wire removed to the armor of the new steel tower, the existing steel tower is installed. A method for rebuilding a tower of an overhead transmission line, characterized by dismantling a tower together with the support structure. [2] the wire support wire is connected to a wire fed through the pulley from winch placed on the ground, its Huy
The wire supporting line is adjacent to the tower by feeding the wire
The method for rebuilding a steel tower of an overhead power transmission line according to [1], which is sent to . [3] Pulling the overhead transmission line from the adjacent steel tower removes the insulator device supported by the armature of the adjacent steel tower.
Te, wherein together with the cross-arm of the adjacent towers remove the support of the overhead transmission lines, towers rebuilding method of overhead transmission lines according to [1] for attracting the wire drawn via the pulley from winch placed on the ground. [4] The after said been pulled preferred Sega <br/> end of overhead transmission lines from the adjacent tower, the jumper wire in a state where not applied overhead line tension of the overhead lines, the support structure through the insulator apparatus The method for rebuilding a steel tower of an overhead transmission line according to [1], which is supported by.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory view schematically showing the outline of an embodiment of a steel tower rebuilding method of the present invention. 2 to 7 are explanatory views schematically showing one embodiment of the steel tower rebuilding method of the present invention in the order of steps.

As shown in FIGS. 1 to 7, according to the method of rebuilding a steel tower, (1) the jumper wire 8 of the existing steel tower 1 is removed and the predetermined supporting structure 5 is attached, and (2) the overhead power transmission line 2 Connection by the elongated jumper wire 6 and support of the jumper wire 6 by the support structure 5, (3) connection of the electric wire support wire 3 to a predetermined insulator device 9, and the existing steel tower of the electric wire support wire 3 Predetermined support for 1, (4) Insulator device 9
From the armor 4 and pulling over the overhead power transmission line 2 from the adjacent tower 21, and (5) constructing a new tower 31 to wrap around the existing tower 1, (6) using the arm 32 of the new tower 31 The new steel tower 31 is constructed by each step of supporting the insulator device 9 and (7) dismantling the existing steel tower 1 and the supporting structure 5.

Hereinafter, one 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, the existing steel tower 1 before the steel tower rebuilding work is provided with the jumper wire 8 and the insulator device 9, and similarly, the adjacent steel tower 21 is also provided with the jumper wire 22, An insulator device 23 is provided. The transmission line 2 has three phases (upper phase, middle phase,
Lower phase) are provided, respectively, insulator device 9 and insulator device 2
It is supported by the arm 4 and the arm 27 through 3.
As shown in FIG. 3, in the existing steel tower 1, the lower phase jumper wire 8 shown in FIG. 2 is removed, and the supporting structure 5 (steel prism, length 8 m) 5 longer than that is attached along the existing arm 4 I installed it. As shown in FIG. 4, adjacent steel towers 2 on both sides of the existing steel tower 1
2, 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, the elongated jumper wire (about 35 m in length) 6 is connected to the power transmission line 2 in the existing steel tower 1 and the pulley 10 (is attached to the support structure 5). a), and an electric 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 electric wire supporting wire 3, and the wire 11 was loaded into the winch 12.

(4) Fourth Step As shown in FIG. 6, the wire 25 supported by the pulley 24 was connected to the terminal of the transmission line 2 in the adjacent tower 21, and the winch 26 was charged with the wire 25. As shown in FIG. 7, in the existing steel tower 1, the support of the insulator device 9 on the arm 4 is released, while the wire 11 is being sent out, the wire 25 is wound up on the adjacent steel tower 21, and the insulator device 9 moves in the direction of the arrow 15.
The wire 11 was sent out until it moved about m. As shown in FIG. 8, the insulator device 23 was attached to the power transmission line 2 at the adjacent steel tower 21, supported by the armor 27, and the jumper wire 22 was connected.
Further, in the existing tower 1, an electric wire supporting 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 supporting structure (steel made of prism, length of 8 m) 5. , And supported the elongated jumper wire 6. As shown in FIG.
The same processes (2) to (6) were performed for the middle phase and the upper phase.

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

(6) Sixth step As shown in FIG. 11, the electric wire supporting wire 3 shown in FIG. 10 is removed from the existing steel tower 1 and the elongated jumper wire 6 is cut into a predetermined length, and then the insulator device. 9 and Hi jumper line 6 new tower 3
It was transferred to the armor 32 of No. 1 and pulled up with a predetermined tension, and the insulator device 9 and the jumper wire 6 were attached.

(7) Seventh Process 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 of rebuilding a steel tower of the present invention, it becomes unnecessary to construct a large-scale temporary structure such as a temporary steel tower and a construction site for a temporary steel tower and a support structure which are conventionally required. Therefore, it is possible to reduce the construction cost and the construction period. Moreover, in the present invention, the live line portion can be sufficiently separated from the construction site in terms of electrical safety, and the safety of the worker can be sufficiently ensured.

[0024]

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing an outline of an embodiment of a steel tower rebuilding method of the present invention, in which (a) is a plan view and (b) is
Is a front view.

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

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

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

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

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

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

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

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

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

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

[Explanation of symbols]

1. Existing steel tower 2. power line 3. Wire support wire 4. Arms (existing steel tower) 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) 9. Insulator device (existing steel tower) 10 (a). Pulley (existing steel tower) 10 (b). Pulley (existing steel tower) 11. Wire (existing steel tower) 12. Winch (existing steel tower) 21. Adjacent steel tower (steel tower adjacent to existing steel tower) 22. Jumper line (adjacent steel tower) 23. Insulator device (adjacent steel tower) 24. Pulley (adjacent steel tower) 25. Wire (adjacent steel tower) 26. Winch (adjacent tower) 27. Arms (adjacent steel tower) 31. New tower 32. Arms (new steel tower) 41. Temporary tower 42. Long arm 43. Support point (existing steel tower) 44. Temporary support (constructed on site)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomokazu Shibata 3-5-10 Higashi-Shinagawa, Shinagawa-ku, Tokyo Within Nitrate Cable Power Systems Co., Ltd. (72) Inventor Tomohiro Kagami 4-chome, Kawajiri-cho, Hitachi, Ibaraki Prefecture No. 1 Inside the Toyoura Plant of Nitate Electric Cable Co., Ltd. (56) Reference JP-A-11-18225 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 1/02

Claims (4)

(57) [Claims] 1. A method of rebuilding an existing transmission tower supporting an overhead transmission line, wherein the existing transmission tower is rebuilt into a new installation tower without changing the position of the transmission tower, and the overhead transmission line is transferred to the new installation tower for support. The support structure extending longer than the armband is attached to the existing steel tower, and the overhead power transmission lines on both sides of the armband are connected by a jumper wire having a predetermined length, and the jumper wire is supported by the support structure, along with connecting the insulator apparatus which is supported on both sides of the arm-in wire support wire, connect the wire to the wire support wire
Then, by sending out the wire,
You can send it from the existing tower to the adjacent towers on both sides of it.
Supported on sea urchin existing tower side, before being attracted to the overhead lines from both sides of the adjacent towers of the existing steel towers with removing the insulator apparatus from the cross-arm
Use the wire to connect the electric wire from the existing tower side to the adjacent towers on both sides.
After sending out a supporting wire for a predetermined length , constructing the new steel tower so as to wrap around the existing steel tower, after supporting the insulator device with the electric wire supporting wire removed to the armor of the new steel tower, the existing A method for rebuilding a tower of an overhead transmission line, characterized by dismantling a tower together with the support structure. 2. The electric wire support wire is connected to a wire sent out from a winch placed on the ground through a pulley ,
By sending out the wire of the winch, the electric wire support wire is
The method of rebuilding a tower of an overhead power transmission line according to claim 1, wherein the tower is sent to an adjacent tower . 3. The pulling of the overhead power transmission line from the adjacent steel tower removes the insulator device supported by the armrest of the adjacent steel tower to remove the support of the overhead power transmission line from the armband of the adjacent steel tower. At the same time , the method of rebuilding a steel tower of an overhead power transmission line according to claim 1, wherein the wire is pulled from a winch placed on the ground via a pulley. 4. After the completion of overhead transmission wire drawing <br/>-out preferred Sega from the neighboring tower, the jumper wire in a state where not applied overhead line tension of the overhead power transmission lines, said through insulator apparatus The method for rebuilding a steel tower of an overhead power transmission line according to claim 1, which is supported by a support structure.