JPH11117575A - Steel tower construction for transmission line and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel tower construction of transmission line and a method thereof capable of executing footing work with hot line to shorten a stop period of time and, at the same time, applying a conventional wrapping method to build-up work of the steel tower. SOLUTION: A new steel tower TN main body (panels K2-K16) except for the lowest panel of a steel tower is installed to the outside of the existing steel tower TO in the same direction in a plane view without contacting the existing steel tower TO. Four new footings FN-FN are positioned between four exisisting footings FO-FO to install. In the lowest panel, main clumn members P1 and P1 making a pair to new footings FN-FN are so extended upward by showing an upper opened V-shape, and the upper parts of the said pair of main column members P1 and P1 are connected to a main column member P2 of the new steel tower main body (panels K2-K16).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction and enhancement of transmission lines, in which the superstructure of a tower is shaped so that a conventional wrapping method can be adopted, and a new foundation can be placed between existing foundations. The present invention relates to a transmission tower structure of a transmission line and its construction method.

[0002]

2. Description of the Related Art In the vicinity of a power demand area, securing new power transmission routes has become strict due to progress in regional development, and it is possible to cope with an increase in power demand by increasing the capacity of existing transmission lines. More. In addition, as the capacity of the transmission line increases, the construction of the transmission line is required.

Here, conventional transmission line rebuilding work is as follows (a) to (d). (A) Removal method: A method of constructing a new transmission line after temporarily removing the existing transmission line, which requires a temporary transmission line to be installed because the outage period becomes longer.
In addition, even when stopping is possible, temporary facilities such as temporary fixing of existing electric wires are required.

(B) Encapsulation method: A method of constructing a new tower outside the existing tower. Since the tower foundation is placed so that it does not contact the existing foundation, the suspension period is short, but it is necessary to acquire land for widening the tower site.

(C) Rotating tower; (45-degree tower) This tower is to place a new foundation between existing foundations.
The purpose is to use the existing foundation effectively. However, since the upper structure is different from the existing tower by 45 degrees in plan view, a method of contacting the existing tower and passing through the gap between the existing members has been adopted during construction. Although the suspension period is short, the tower assembly work is complicated by congestion with existing members.

(D) Raising method: A method of lifting an existing tower with a hydraulic jack or the like and inserting a new tower material into a lower part of the tower. This method cannot be used for reinforcement of transmission lines, etc., because existing steel towers are used.

[0007]

In each of the above-mentioned conventional methods, a method which can be used for increasing the capacity of a transmission line is as follows.
However, the removal method shown in (a) cannot be used because it involves a problem in that the suspension period is lengthened and temporary facilities are constructed. Further, the enclosing method (b) has a drawback that a widening land is required at a position limited to a new foundation. Further, (c)
Although the rotating towers can be used for live work for foundation work, the upper assembly work will be congested with existing towers, complicating the structure and construction.

[0008] In the rebuilding work at the original position of the existing transmission line, the enclosing method is generally adopted from the standpoint of downtime and cost. In this wrapping method, a new tower is arranged outside the existing tower, so that the new tower foundation is located outside the existing tower, and the installation location is also limited. In this case, widening land is required, but it may not be possible due to the land use form, and after removing the existing tower, a new tower will be constructed.

The present invention solves the above-mentioned problems of the conventional construction form and makes it possible to utilize the advantages of each of them. It is an object of the present invention to provide a transmission tower structure and a method for assembling a transmission tower, which can apply a conventional wrapping method and eliminate the need for a widening site.

[0010]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
A new tower to be installed outside of the existing tower by the wrapping method, the new tower body other than the lower end structure of the tower is formed in the same direction as the existing tower in plan view, and the new foundation is viewed in plan with respect to the existing foundation. Installed in a rotated position, the lower end structure,
The power transmission tower structure is characterized in that the new foundation and the main pillar material of the new steel tower are connected by an oblique main pillar material. The invention according to claim 2 is a new tower to be installed outside the existing tower by the enclosing method, wherein the main body of the new tower except for the lowermost panel of the tower is not in contact with the existing tower outside the existing tower and in plan view. In the same direction, a new foundation is installed between existing foundations, and at the bottom panel, each new foundation is installed so that a pair of main pillars has a V-shape that opens upward and extends upward. And an upper part of the pair of main pillars connected to a main pillar of the new tower body. The invention according to claim 3 is characterized in that a plurality of intersections where the pair of main pillars of the lowermost panel are connected to the main pillar of the new tower main body are connected by horizontal members. Power transmission tower structure. The invention according to claim 4 is a method of installing a new foundation located between existing foundations when installing the existing foundation on the outside of the existing steel tower, and a method of opening a pair of main pillars on each new foundation. Installing the lowermost panel so as to have a V-shape and extend upward, assembling the new tower body panel outside the existing tower in the same direction as in plan view without contacting the existing tower and dismantling the existing tower. And a step of replacing an existing tower with a new tower. The invention of claim 5 is that, in the step of installing the lowermost panel, the transmission of the existing transmission line is continued, and in the step of assembling the panel above the lowermost panel, the transmission of the existing transmission line is stopped, and for each of the plurality of arms, 5. The method according to claim 4, wherein the panel is assembled to the vicinity of the arm, and after the assembly, the step of temporarily fixing the transmission line to the main pillar and removing the arm is repeated. It is. The invention of claim 6 is the method of constructing a transmission line tower structure according to claim 4 or 5, wherein a diagonal member of the new tower is installed after the existing tower is removed.

According to the power transmission tower structure and the method of construction of the present invention, a new tower main body other than the lower end structure of the tower (such as the lowermost panel) is formed in the same direction as the existing tower in plan view, and the new foundation is installed. And the lower end structure connects the new foundation and the main column material of the new steel tower with an oblique main column material. As a result, the new tower body can be installed in the same direction as the existing tower, and can be installed in a direction rotated by approximately 45 ° with respect to the new foundation.

[0012] The lowermost panel is installed on each new foundation so that a pair of main pillars has an upwardly open V-shape and extends upward. , The wrapping method can be realized with an extremely simple structure in which the main pillar of the lowermost panel is installed in a V-shape.

Therefore, in the present invention, the bottom panel of the tower is devised so that the foundation work can be performed by live lines.
The suspension period can be shortened. In addition, since the upper tower assembling work can be performed by the enclosing method, the tower structure can be used with the existing structure, and the design and construction can be simplified.
In addition, since a new foundation can be installed between the existing foundations, a widening site can be eliminated.

If the plurality of intersections where the pair of main pillars of the lowermost panel are connected to the main pillar of the new tower body are connected by horizontal members, the lowermost panel is connected by the connection of the intersections. The connection between the new tower and the new tower is simple and strong. Also, in the installation process of the bottom panel, the transmission of the existing transmission line is continued, and in the process of assembling the panel above the bottom panel, the transmission of the existing transmission line is stopped. In addition to shortening the period, the process of temporarily fixing the wire to the main pillar and removing the arm bar is repeated, so there is no need to separately construct the wire support part when removing the arm bar, further shortening the construction period Can be Further, since the diagonal members of the new tower are installed after the removal of the existing tower, the rigidity of the towers is increased by the diagonal members, and the installation of the diagonal members is easy since the existing towers are removed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 are explanatory diagrams of a transmission tower structure according to an embodiment of the present invention, in which a new tower TN indicated by a solid line is replaced with an existing tower TO indicated by a broken line.
It is a figure shown in comparison with. FIG. 1 is a plan view of the lowermost panel and the foundation. FIG. 2 (A) is a diagram viewed from the front, and FIG. 3 (B) is a diagram viewed from an oblique direction shifted from the front by 45 degrees. FIG. 4 is an overall view of the new tower TN and the existing tower TO, and FIG. 5 is a sectional view (viewed from C).

As shown in the figure, in the tower structure of the transmission line, the new tower TN body (panels K2 to K16) except for the lowermost panel K1 of the tower is brought into contact with the existing tower TO outside the existing tower TO. And are arranged in the same direction in plan view. Then, four new foundations FN to FN are respectively installed between the four existing foundations FO to FO. In the lowermost panel K1, each of the new foundations FN to FN has a pair of main pillars P
1, P1 is installed so as to exhibit a V-shape that opens upward and extend upward, and the upper part of the pair of main pillars P1, P1 is connected to the main pillar P2 of the new tower body (panels K2 to K16). I do. A plurality of intersections 10, 10,... Where the pair of main pillars P1, P1 of the lowermost panel K1 are connected to the main pillar P2 of the new tower body (panels K2 to K16) are connected by a horizontal bar S1. As shown in FIG. 5 showing a cross section of a contact point between the panel K1 and the panel K2, a new tower TN is provided around the existing tower TO. In addition, the lowermost panel K1 is additionally provided with appropriate reinforcing members (indicated by reference numeral 14) in the horizontal and vertical directions between the main pillars P1, P1, and the horizontal member S1, and the like, so that structural strength is improved. I try to improve.

In the rebuilding work, as shown in FIGS. 1 to 4, four new foundations FN are installed between four existing foundations FO in a live state. Each new foundation FN
The two main pillars P1, P1 are connected by a structure supporting the V-shape on the upper side. At the time of the rebuilding work, when the construction of the new tower TN was started, the existing tower TO was left as it was without being removed, and during the construction of the new tower TN,
The existing tower TO was partially removed and the new tower TN
Construction and removal of the existing tower TO will be performed alternately.

Each construction step of the rebuilding work will be described in detail with reference to FIGS. As shown in FIG. 6, in assembling the lowermost panel K1 of the new steel tower TN, the main column material P1 is changed to the main column material P2.
When the new foundation FN is connected to the existing foundation FO, an angle of 45 degrees is deviated from the existing foundation FO to an angle similar to that of the existing tower TO. In the subsequent upper assembly (panel K2 to panel K16), the new tower FN is used. The TN is assembled so as to wrap the existing tower TO. Then, in the panel K1, the intersections 10, 10 of the main pillar P1 and the main pillar P2 are connected to each other by the horizontal
It is connected and configured. At this time, since the existing tower TO is wrapped around, the diagonal members 12 and 12 (see FIG. 5) of the new tower TN cannot be installed. However, this is installed after removing the existing tower TO entirely.

Then, the panels K2 and above are assembled up to the panel K3 by stopping the electricity of the existing tower TO and wrapping the panels. Thereafter, the electric wires C2 and C3 of the existing tower TO are temporarily fastened to the main pillar P of the new tower TN (see FIG. 6).

Next, the arm a2 and the arm a of the existing tower TO
3 is disassembled, the panel K4 is assembled, and the overhead ground wire g and the electric wire c1 are temporarily fixed to the main pillar P (see FIG. 7). After the temporary fastening is completed, the arm bar ag and the arm bar a1 of the existing tower TO are dismantled (see FIG. 8). After the existing tower TO is dismantled sequentially, the new tower TN is assembled sequentially from the panel K5 to the top panel K16 (see FIG. 9), and further, the arm members AG, A1 to A3 are attached and temporarily anchored to the main pillar P. The imaginary ground wire g and the electric wires c1 to c3 that have been
(See FIG. 10).

According to the transmission line tower structure and the method of construction of the embodiment, the new tower main body (panels K2 to K16) other than the lowermost panel K1 of the new tower TN is formed in the same direction as the existing tower TO in the plan view. The foundation FN is installed at a position rotated in plan view with respect to the existing foundation FO, and the lowermost panel is
The new foundation FN and the main pillar P2 of the new steel tower TN are connected by an oblique main pillar P1. As a result, the new tower TN body can be installed in the same direction as the existing tower TO, and can be installed in a direction rotated by approximately 45 ° with respect to the new foundation FN. This 45
The newly installed tower TN can be referred to as a “twisted tower” because of its twisted shape.

The lowermost panel K1 is provided with each new foundation FN.
The upper part of the pair of main pillars P1, P1 is the main pillar P of the new tower body
2, since it is connected to P2 and the main pillars are simply installed in a V-shape, the wrapping method can be realized with an extremely simple structure.

Therefore, in the embodiment, the lowermost panel of the tower is devised so that the foundation work can be performed by hot wire, the stop period can be shortened, and the assembling work of the upper tower is
Since the construction using the enclosing method is possible, the steel tower structure can be used with the existing structure, and the design and construction can be simplified. The plurality of intersections 10, 10,...
The connection at the intersection makes the connection between the lowermost panel K1 and the new tower TN body strong with a simple structure.

The electric wires C2 and C3 of the existing tower TO are connected to the main pillar P
Since the process of removing the arm members ag and a1 to a3 by temporarily fixing the arm members to (P2) is repeated, it is not necessary to separately perform a wire support part work when removing the arm members, and the construction period can be shortened. In addition, after removing the existing tower TO, the diagonal timber 12 of the new tower TN is removed.
Is installed, the rigidity of the tower is increased by the diagonal members 12, and the diagonal members 12 can be easily installed since the existing steel towers have been removed.

[0025]

As described above, according to the present invention, the foundation is provided at a position where the new tower is twisted by, for example, about 45 degrees with respect to the existing tower, and is returned to the same angle as the existing tower at the upper part of the lowermost panel. As a result, the foundation work can be performed by live lines, and the downtime can be shortened, and the conventional wrapping method can be applied to the construction work of the steel tower.

[Brief description of the drawings]

FIG. 1 is a plan view showing a new tower and an existing tower according to an embodiment of the present invention.

FIG. 2 is a view as viewed in a direction A in FIG. 1;

FIG. 3 is a view as viewed in a direction B in FIG. 1;

FIG. 4 is an overall side view showing a new tower and an existing tower according to an embodiment of the present invention.

FIG. 5 is a sectional view in the direction C in FIG. 4;

FIG. 6 is an explanatory diagram of a procedure for rebuilding an existing pylon to a new pylon of FIG. 4;

FIG. 7 is an explanatory diagram of the rebuilding procedure following FIG. 6;

FIG. 8 is an explanatory diagram of the rebuilding procedure following FIG. 7;

FIG. 9 is an explanatory diagram of the rebuilding procedure following FIG. 8;

FIG. 10 is an explanatory diagram of the rebuilding procedure following FIG. 9;

[Explanation of symbols]

 FN New foundation F0 Existing foundation TN New tower T0 Existing tower P New main pole p Existing main pole K New panel k Existing panel S1 New horizontal material a Existing arm g g Overhead ground wire c Electric wire

Claims (6)

[Claims] Claims: 1. A new tower installed by an enclosing method outside an existing tower, wherein a new tower body other than a lower end structure of the tower is formed in the same direction as the existing tower in plan view, and a new foundation is used as an existing foundation. The lower end structure is connected to the main pillar of the new foundation and the main pillar of the new tower with an oblique main pillar. Tower structure. 2. A new pylon installed outside the existing pylon by an enclosing method, wherein the main body of the new pylon except for the lowermost panel of the pylon does not come into contact with the existing pylon outside the existing pylon and is in the same direction in plan view. And a new foundation is installed between existing foundations. In the bottom panel, each main foundation has a pair of main pillars with an open V
A tower structure for a transmission line, characterized in that it is installed so as to have a U-shape and extends upward, and the upper portion of the pair of main columns is connected to the main column of a new tower body. 3. The feeder according to claim 2, wherein a plurality of intersections at which the pair of main pillars of the lowermost panel are connected to the main pillar of the new tower body are connected by horizontal members. Electric tower structure. 4. A step of installing a new foundation between existing foundations when installing the existing foundation on the outside of a steel tower by a wrapping method, and a V-shape in which a pair of main columns is opened upward on each new foundation. A step of installing a lowermost panel so as to extend upward in shape and a step of disassembling the existing tower and assembling the new tower body panel outside the existing tower in the same direction as in plan view without contacting the existing tower. A method of constructing a power transmission tower structure in which an existing tower is replaced with a new tower. 5. The step of installing the lowermost panel, the power transmission of the existing transmission line is continued. In the step of assembling the panel above the lowermost panel, the transmission of the existing transmission line is stopped. 5. The method according to claim 4, wherein the panel is assembled to the vicinity of the gold, and after the assembly, the step of temporarily fixing the transmission line to the main pillar and removing the arm bar is repeated. 6. The method according to claim 4, wherein a diagonal member of a new tower is installed after removing the existing tower.