JP3114542U - Structure of steel tower for raising the height - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relocate an existing tower without changing the existing foundation and without installing temporary equipment such as a lifting device, and moving the electric wire in a short power failure and keeping the power transmission To provide an efficient, functional and economical rebuilding tower that can be easily reconstructed in Japan.
SOLUTION: A new base is installed at a position obtained by rotating the position of an existing foundation on a diagonal line by 45 ° around a steel tower, and the main steel body is constructed along the outside of the existing steel tower using the existing steel tower as a scaffold Assemble and wrap up the existing steel tower. After assembling the upper and lower bodies, power is cut off and the wires are transferred to the main body of the new steel tower. After attaching the brace to the new steel tower, the electric wires are transferred to this for transmission. After that, the existing steel tower encapsulated in the new steel tower will be dismantled and removed. However, if there are plans to increase the number of towers, increase the number of circuits, etc. in the future, this will be retained.
[Selection] Figure 1

Description

  This device relates to the rebuilding of transmission line towers. Specifically, it is a structure adapted for rebuilding (building reinforcement with new towers, raising and dismantling and removal of existing towers) to expand and scale the existing towers. And a steel tower with functions.

In order to respond to the increase in steel towers to maintain the separation between transmission lines and structures derived from the increase in buildings and the rise in height due to regional development and urbanization around the transmission lines in recent years, or to respond to the increase in power demand Conservation measures such as expansion and enhancement of the facility scale had to be taken.
However, the existing transmission line cannot be stopped for a long period of time and the tower cannot be expanded or rebuilt, so it was necessary to temporarily stop the existing tower and rebuild it while keeping the track in its original position.
As a technology corresponding to this, a lifting device (lifting machine using a hydraulic jack) that is a temporary foundation in the site is installed inside or outside the existing tower, thereby pushing up the existing tower to a predetermined height, The technique of adding new members between the lowest part of the existing steel tower and the new foundation is adopted. FIG. 7 shows an example of the “construction method of the steel tower lower structure” in which a raising device is installed inside the existing steel tower to raise the lower main body of the existing steel tower. In addition, as shown in Fig. 8, the new foundation is constructed at a position where the existing foundation is rotated 45 degrees, and this foundation is used as a base so that the members of the new tower are wrapped along the outside of the existing tower. As the bottom structure when reinforcing the existing steel tower in response to the “transmission line tower rebuilding method” that constitutes the covered rotating steel tower and the enlargement of the tower tower, the existing foundations are connected as shown in FIG. A new foundation is constructed on the construction surface, and the main base material of the new foundation and the main pillar material of the lowermost main body of the existing tower are separated into a V shape by two main pillar materials, and the foundation stress is applied to the old and new foundations. In addition to the “bottom structure of the steel tower”, which is well-divided into various parts, various methods such as “the diamond-shaped steel tower” corresponding to the abnormal wind pressure during oblique winds as shown in FIG. 6 are disclosed.

However, all of the conventional methods have square cross-sectional shapes that make up the upper and lower bodies of the old and new towers. Therefore, unless the position of the foundation of the new tower is changed by rotating 45 degrees, the foundation of the new tower will be used. In addition to being unable to install near the foundation of existing towers,
(1) Temporary equipment such as a lifting support device needs to be constructed around the inside and outside of the existing steel tower.
(2) The method of covering all the towers of existing towers must be possible without a power outage for a long time.
(3) Working conditions (safety and continuity) at the time of strong winds, live lines, and power outages are restricted.
(4) The application to heavy-angle steel towers with large horizontal loads is limited.
(5) When the main body has a square cross section, it cannot handle four legs against the wind pressure from the diagonal direction. (6) There is a problem in that it takes a lot of time and labor for the work and the construction cost is high and it is uneconomical. there were.
Therefore, it was necessary to formulate a tower structure that solved these problems and had the function to adapt to the expansion of the facility scale as well as the rebuilding technique with more safety, workability and economy.
Utility Model Registration Gazette, No. 2581350 (Rhombus structure steel tower) Sho 63-147019 (Method for constructing steel tower lower structure) Japanese Patent Laid-Open No. 9-137633 (Transmission Line Tower Reconstruction Method) JP 2004-132112 A (the lowest structure of a steel tower)

The problem with the present invention is that the shape of the cross section that constitutes the tower body that is the foundation of the structure of the support has conventionally been square, and it is the same shape when it is rebuilt, but the square is square. In the steel tower, as will be described later, the mechanism problem regarding the abnormal load derived when the wind is applied from the direction of 45 degrees with respect to the track direction is silent, and the shape of the steel tower body to be rebuilt is easily made the same shape, Since the new foundation could not be installed near the existing foundation, the location was changed to a 45-degree twisted place, but this was not a perfect measure.
Conventionally, when rebuilding a steel tower, if possible, we would like to build a new foundation near the existing foundation on the same site, but if the cross section of the main body of the old and new steel towers is square, both foundations will be diagonal, Since the foundations of both steel towers are polymerized, it is difficult to install the foundation of the new steel tower close to the foundation of the existing steel tower, and once installed, it is difficult to remove the existing foundation.
Therefore, if the existing tower is kept and the tower is to be reconstructed in a state where power transmission and stop are possible, a temporary foundation to replace the new foundation will be temporarily built around the existing foundation. Or, after reinforcing the foundation of the existing tower in advance, one of the methods of assembling a new tower using that foundation will be adopted, but both methods require work and time, and the construction period is long. The construction method lacks economic efficiency because it is poor in safety and safety, and the construction cost increases.
In addition, when the new foundation is constructed at a position twisted 45 degrees and the main body is assembled into a ◇ shape, the upper main body and the electric wire approach each other, and the insulation interval is insufficient, so the armrest is lengthened and the armrest is attached to the main body. In this state, when the wind blows in the direction of the track or in a direction perpendicular to it, the four-legged correspondence changes to the two-legged (two main pillar materials), so the two main pillar materials Load concentrates.
That is, in a square steel tower with a square cross section, the wind receiving area is doubled when the wind is applied from the 45-degree direction (diagonal direction) with respect to the track direction. Column material) is subject to an abnormal load of √2 times (1/4 times the design load), and the other two columns are subjected to half the load (compression and tension), but they cancel each other, No bending stress is generated in the column.
The steel tower is designed to always support four legs against the load. However, in the above situation, the tower is compatible with two legs, and stress on the diagonal columns exceeds the allowable stress, reducing the safety factor of the members. As a result, the two pillars buckled, causing a problem that the support collapsed.
The present invention is to fundamentally elucidate such basic structural problems, and to establish a steel tower for raising the lift that is more organic, functional, efficient, rich in workability and economy. .

As a means to solve these problems,
(1) The direction of the tower body facing the track direction is rotated 45 degrees with respect to the tower center point, and the foundation of the new tower is placed on the diagonal of the cross section of the main body (existing foundation and foundation Therefore, it is easy to construct the foundation of the new tower regardless of the foundation of the existing tower.
(2) At the bend point, one upper main pillar material and two lower main pillar materials are joined in an inverted Y shape using a joint, and the pillar is branched. As a result, the lower main body has eight main pillar members (cross section, regular octagonal shape), and the stress generated in the upper main body (four main pillar members) is evenly distributed to the lower main body (eight).
(3) The upper main body is composed of four main column members and four abdominal members from the bend point (the cross section is square).
(4) The main base material of the new foundation and the two main pillars of the lower body are connected to the V shape using the joints.
(5) The members (main column member and abdomen) constituting the upper and lower main bodies (the tower body excluding the armor) of the new steel tower are assembled so as to be wrapped along the outer surfaces of the upper and lower main bodies of the existing steel tower.
(6) Work such as assembly of new steel towers or dismantling and removal of existing steel towers is carried out using lightweight tools on the existing steel tower or work scaffolds, winches, and pedestals attached to the new steel tower.
(7) To relocate existing wires, temporarily suspend the track and temporarily secure it to the upper body of the new tower. After that, put it back on the end of the arm attached to the upper body of the new tower.
(8) In order to prepare for a future increase plan, the existing steel tower will be kept.

The special feature of the present invention is that the mechanism of abnormal wind pressure load in the case of a slant wind in a square steel tower, which has been completely silent in the past, is emphasized and adapted to this structure. That is,
(1) The main body below the bend point is made up of 8 main column members, and the main column material stress is equalized, so that it can handle 2 legs during oblique winds (2 square main column members). (Eight octagonal main pillar members) and the stress of the main pillar member is reduced, so that the total weight of the members constituting the lower body is also reduced.
(2) Since it is easy to construct the foundation of the new steel tower between the existing foundation and the foundation regardless of the foundation of the existing steel tower, there is no need to install temporary equipment such as a support device (for lifting and lowering).
(3) Using existing steel towers or new steel towers, work scaffolds, winches, pedestals, etc. can be attached to easily assemble new steel towers or dismantle and remove existing steel towers.
(4) The cross section of the lower main body of the new tower will be an octagon inscribed from the square of the existing tower section, and the average wind receiving width will be close to the width of one side from the width of the square diagonal line, reducing the wind pressure load.
(5) An efficient and all-wind-direction structure that can be applied to heavy-angle steel towers with large horizontal loads.
(6) The tower structure is expanded and renovated by a simple and efficient technique that does not require time and effort, and it is excellent in safety and workability. .
(7) When existing steel towers are kept and the system is expanded in the future, if the tower top of the existing steel tower is added, it will be easy to increase the number of towers and increase the number of circuits. Play.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a steel tower for raising a height according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 (a), (b) and FIG. 3, the arrangement of the foundation 4 of the existing tower (hereinafter referred to as the old tower 2) that faces the track direction is rotated 45 degrees with respect to the center point of the tower body. After the foundation 3 of the new steel tower (hereinafter referred to as the new steel tower 1) is installed at the position, it is rebuilt by the following work process.

  Fig.5 (a) shows the outline when the old and new steel towers are erected, and the new steel tower is removed without removing the foundation 4 of the old steel tower 2 in the site of the steel tower as shown in Figure (b). After the foundation 3 of 1 is constructed between the foundation 4 and the foundation 4 of the old tower 2, the lower main body 6 member of the new tower 1 is attached to the lower part of the old tower 2 using a base bar installed on the top of the old tower 2. Assemble along the outside of the body 06.

  After assembling the upper main body 5 of the new tower 1, the line 1 side is temporarily stopped as shown in FIG. 2C, and the ground line G and three power lines C1 (C1, C2, C3) are connected to the upper main body 5 of the new tower 1. After moving to the No. 1 line side member (main pillar material 10) and temporarily securing it, the brace 8 on the No. 1 side of the old tower 2 is removed using a pedestal.

  As shown in Figure (d), after attaching the new brace 7 (upper, middle, lower) to the No. 1 side of the upper body 5 of the new steel tower 1 using the base bar, The power line C3 is returned to the tip of the new arm 7 and attached, and after power transmission, the line 2 side is temporarily stopped, and the ground line G and the power line C3 are connected to the line 2 side member of the upper body 5 of the new tower 1 Move to (main pillar village 10) and temporarily fix.

  After attaching the new arm 7 to the No. 2 side of the upper body 5 of the new steel tower 1 using a bar as shown in Fig. (E), the transferred No. 2 ground line G and three power lines C are used as the new arm 7 After being mounted back to the front end of the wire, power is transmitted to complete the assembly of the tower of the new steel tower 1 and the relocation of the No. 1 and No. 2 wires (the ground line G and the power line C). Thereafter, the lower main body 06 is sequentially dismantled from the upper main body 05 of the old tower 2 and the old foundation 4 is removed, so that all the work of enclosing and rebuilding the old steel tower is completed.

  FIG. 5 (f) shows that when the process of FIG. 5 (e) is completed, the old tower 2 is immediately dismantled and removed if further towers or multiple circuits are planned in the future. It shows the form of a multi-line tower after the top part of the upper main body 05 of the old tower 2 is added and raised, and the members, the foundation 4 and the function of the old tower 2 are effective. Be utilized.

  The schematic diagram which shows embodiment of the encapsulation type rebuilding of this invention. (A) Assembly status diagram of the lower part of the main body (b) Plan view showing the arrangement of old and new foundations   The top view which shows the arrangement | positioning and structure of the foundation of a new and old steel tower, a lower main body, and a brace.   The top view which shows arrangement | positioning and a structure of the foundation and lower main body (main pillar material) of a new and old steel tower.   The front view which shows the member structure and structure of the upper and lower main bodies of a new and old steel tower.   The general-view figure which shows the method of the encapsulation type rebuilding of this invention. (A) The front view which shows the form of the encapsulation type reconstruction of a new and old steel tower. (B) Installation of the new steel tower foundation and assembly of the lower body. (C) The main body transfer situation figure of the No. 1 side electric wire after the upper main part assembly of a new steel tower. (D) Re-transfer of electric wires to the brace installed on the new steel tower and transfer of the main body of the No. 2 side electric wire. (E) The schematic diagram after completion of the old steel tower encapsulation of the new steel tower. (F) Schematic diagram of a multi-line steel tower where the old steel tower is kept and the top is added to make it taller.   The schematic diagram which shows the form of the conventional rebuilding construction method (rhombic structure steel tower).   The schematic diagram which shows the form of the conventional rebuilding construction method (construction method of a steel tower lower part structure).   The schematic diagram which shows the form of the conventional rebuilding method (transmission line tower rebuilding method).   Schematic diagram showing the form of the conventional rebuilding method (bottom structure of steel tower)

Explanation of symbols

1 New steel tower (new steel tower)
2 Old steel tower (existing steel tower)
3 new foundation (new foundation)
4 old foundation (existing foundation)
5 New upper body (new upper body) 05 Old (existing) upper body 6 New lower body (new lower body) 06 Old (existing) lower body 7 New arm (new arm)
8 old arm (existing arm)
10 Main pillar material 11 Horizontal material 12 Diagonal material G Ground line C Power line C1 Upper line C2 Middle line C3 Underline

Claims (1)

It is a rebuilding steel tower when raising and strengthening a steel tower (section steel or steel pipe) in its original position,
(A) Do not perform temporary facilities such as raising equipment around the foundation of the existing tower. (B) Build the foundation of the new tower at a position rotated 45 degrees around the position of the existing foundation without being involved in the existing foundation. (C) Use new and old steel towers to install scaffolding, pedestals and winches in the tower body, and perform rebuilding work using lightweight general-purpose tools (d) In addition to relocating electric wires, rebuilding Work (assembling, dismantling, removing) with live lines (e) Performing the structure of the new steel tower (framework) so as to enclose the outside of the existing steel tower (f) At the bend point, branch the column by connecting one main pillar material at the upper part of the main body and two main pillar materials at the lower part of the main body into an inverted Y shape using a butt joint or flange joint (g) Main leg of the newly established foundation Use a butt joint or flange joint for one material and two main pillars of the lower body (H) The upper main body of the new steel tower is composed of four main pillars and the cross section is square. (I) The lower main body of the new steel tower is composed of eight main pillars. (J) Adapted to the expansion and renovation of power transmission facilities characterized by having existing steel towers and making effective use of them in order to increase the number of towers and increase the number of circuits in the future. Structure steel tower.

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