JPH09137633A - Power-transmission line steel tower reconstruction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible reconstruction work of the original position of a steel tower in short-period power outage without needing any new site by reducing the cost. SOLUTION: A new foundation 1 is disposed in an established foundation 21, the direction is changed over to 45 degrees in a plane view and a new steel tower T is constructed. The new steel tower is divided into a cross panel, an intersecting panel and an upper non-intersecting panel, and each panel is provided with main column material and web members disposed laterally of the main column material. The web members in the cross panel and the intersecting panel are provided with horizontal auxiliary material, first diagonal members and second diagonal members, which are assembled by a K truss, and the web members in the upper non-intersecting panel are assembled by a double warren truss. When a K trussed new panel is assembled, the web members are set outside from the panel of the established steel tower (t) by disposing a temporarily set material on the web members.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rebuilding a transmission line steel tower, and more particularly to constructing a new steel tower within an area of an existing steel tower site without removing the existing steel tower.

[0002]

2. Description of the Related Art In recent years, as the number of houses increases, the construction work of steel towers in urban areas is increasing. However, due to urbanization,
Since there is no space for temporary work and the company's land is limited, it is often difficult to rebuild due to technical reasons.

Conventionally, in the rebuilding work of transmission line towers,
Mainly 1. Original construction method to remove former position, 2. Wrapping method, 3. T
LU method (hydraulic lift up), 4. The TOP construction method (tower overlap) and the like are known.

The original construction method of removing the original position is a method of removing an existing steel tower and constructing a new steel tower on the existing site. Although the site to be installed does not change, the power failure period becomes long. For this reason, temporary work is usually performed to reduce the period of power failure.

As shown in FIG. 7, the enclosing method is a method of constructing and assembling a new steel tower foundation outside the existing transmission line steel tower foundation. It will be necessary to purchase additional steel tower premises for the foundation to be installed at.

[0006] The TLU method has been developed for the situation where it has been difficult to buy more steel tower premises, and an existing steel tower is lifted by a hydraulic lift and a new member is attached to the lower part of the tower. The construction work can be done in a short period of time without the need to expand the site. However, it is limited to the extent that the foundation ground is relatively strong and the existing steel tower foundation is diverted or reinforced.

Similar to the TLU method, the TOP method is a method developed to solve the conventional problems. The existing foundation is used as it is, and a new steel tower is installed outside the existing steel tower so as to cover the existing steel tower. It is constructed and there is no need to expand the site. However, since the existing foundation is used as it is, it cannot be applied when the strength of the existing foundation is exceeded.

[0008]

However, these conventional construction methods require an increase in construction costs associated with temporary construction and a new site for that purpose. In particular, it is extremely difficult to purchase new sites in urban areas, and the construction period was long. Further, in the case of the TLU construction method and the TOP construction method, the work content is limited, and it remains unsuitable for large-scale upsizing and reinforcement work, and it is not applicable when the strength of the foundation is exceeded.

The present invention is to solve the above-mentioned problems and enables construction on soft ground without increasing the cost.
It is an object of the present invention to provide a new transmission tower reconstructing method that enables short-term construction without requiring a new site.

[0010]

In order to solve the above-mentioned problems, in the transmission line steel tower rebuilding method according to the present invention, in order to solve the above-mentioned problems, a transmission line steel tower comprising a plurality of stacked panel parts and a plurality of transmission line bodies is provided. It is a construction method for rebuilding, in which a foundation of a new steel tower is constructed between the foundations of existing steel towers, and the new steel tower is constructed by changing the direction in plan view by 45 degrees with respect to the existing steel tower. It is what

Further, preferably, the panel comprises a main pillar material arranged in a vertical direction and an abdominal material arranged in a lateral direction with respect to the main pillar material, and the panel has a plurality of stages. Among them, at least a part of the panels is provided with an abdominal material including a K-shaped portion, and when the panels are assembled, a temporary material is provided on the abdominal material forming the K-shape, and a part of the abdominal material is already installed. What is characterized is that it is temporarily arranged on the outside of the panel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall view of rebuilding an existing steel tower into a new steel tower, and a new steel tower T to be newly constructed.
It is a figure which shows the comparison with respect to the existing steel tower t shown by a two-dot chain line. Then, the new steel tower T is shown at an angle deviated from the existing steel tower t by 45 degrees in a plan view. FIG.
Is a plan view of the foundation set, showing four new foundations 1
However, it is cast in place between four existing foundations 21 by a large diameter boring machine. On this foundation 1, a new steel tower T is constructed so as to deviate from the existing steel tower t by 45 degrees. In this rebuilding work, the existing steel tower t is not removed at the time of constructing the new steel tower T and remains as it is, and the existing steel tower t is removed during the construction of the new steel tower T.

In the completed new steel tower T, the panel P of the new steel tower T is formed to be relatively wider than the panel p of the existing steel tower t from the lower end toward the upper part, and as shown in FIG. 3 panel sections: cross panel (Fig. 3a), cross panel (Fig. 3b), and upper uncrossed panel (Fig. 3c).
The stages are distinguished. Then, the panel P1 disposed immediately above the new foundation 1 is arranged at the lowermost stage, and P2, P3, ...

The panel P is a main pillar member 2 arranged in the vertical direction.
And a belly member 3 arranged in the lateral direction with respect to the main pillar member 2 to form a panel set. And each panel P
Are assembled in order from the bottom. The configuration of the abdominal material 3 differs depending on the panel section, the cross panel and the cross panel have the same configuration, and the upper non-cross panel differs.

The cross panel comprises a main pillar member 2 and a belly member 3 (a detail of the belly member 3 will be described later) which partially includes a K-shaped member formed in a horizontal K shape. A panel used when the steel tower T crosses the existing steel tower t,
For example, in the case of the panel P1, the panel p1 of the existing steel tower t
It is formed in almost the same size as
The main pillar material and the side surface (belly material 3) of the mating panel are in a crossed state with each other. Then, toward the upper panel, the width of the panel P of the new steel tower T gradually becomes relatively larger than that of the existing steel tower t, and the cross panel continues up to around the panel P5.

The cross panel is composed of a main column member 2 and a belly member 3 which partially includes a horizontal K-shaped K structure, and the side surface of the new steel tower T is entirely the existing main member. In the panel used in a state of contacting and intersecting with the pillar member 22, for example, in the case of the panel P6, the length of the side surface (belly member 3) of the panel of the new steel tower T and the length of the diagonal line of the panel of the existing steel tower t are almost the same. Formed the same.

The upper non-intersecting panel is composed of a main pillar material 2 and a belly material 3 formed of a double Warren structure arranged in an X shape, and the entire surface of the new steel tower T is located outside the existing steel tower t. In the case of the panel used in the arranged state, for example, the panel P7, the panel of the existing steel tower t is completely accommodated in the panel of the new steel tower T.

Therefore, in the panels P1 to P6, each panel P is composed of a cross panel or a cross panel provided with a K-structured abdominal material, and the panels P7 to 19 are provided with an upper portion provided with a double warren-structured abdominal material. It will consist of unintersecting panels. Then, three sets of power transmission line bodies 12 (existing steel tower t
The one used for was attached.

FIGS. 4 to 6 show details of the panel P section which is K-structured, and show a state in which a new panel is assembled to the remaining existing steel tower t.
FIG. 4 is a plan sectional view, in which four main pillar members 22 of the existing steel tower t are erected upright, and four horizontal auxiliary members 24 are provided outside each of the main pillar members 22. It is fixed to the main pillar material 22 so as to be suspended on 22, and forms a square frame.

New main pillar material 2 forming a new panel P
4 are arranged at a position shifted by 45 degrees in a plan view with respect to the existing main pillar member 22. And the existing main pillar material 2
2 and a position that does not contact the horizontal auxiliary member 24 (horizontal auxiliary member 2
So that a new horizontal auxiliary member 4 is arranged on the outer side of 4),
A first temporary material 5 is attached between each new main pillar material 2 and horizontal auxiliary material 4 to form a square frame.

FIG. 5 is a front view of the panel P, in which the new main pillar members 2 erected on both sides are wide at the bottom,
It is narrowing upward. And the horizontal auxiliary material 4
From the central part of the
A diagonal member 6 is provided. On the back side of the lower end of the first diagonal member, as shown in FIG.
As shown in, the second diagonal member 8 having one end fixed to the main pillar member 2 is connected via the second temporary member 7 having the same thickness as the first diagonal member 6. Further, between the second diagonal member 8 and the main pillar member 2, a third diagonal member 9 obliquely arranged and a reinforcing member 10 horizontally arranged are attached. The horizontal auxiliary member 4, the two first diagonal members 6 and the second diagonal member 8 form a “K” shape (hereinafter referred to as “K”), and the K-shaped portion excluding the second diagonal member 8 is formed. Is disposed outside the existing panel p so as to avoid contact with the main pillar material 22 and the horizontal auxiliary material 24 of the existing panel p.

The belly member 3 is composed of a horizontal auxiliary member 4, a first diagonal member 6, a second diagonal member 8, a third diagonal member 9 and a reinforcing member 10, and four main pillar members 2 and 4 faces. A set of panels P including the abdominal material 3 is formed.

Since the temporary members 5 and 7 are intended to allow the K structure portion to escape to the outside from the existing panel p, the thickness L of the temporary members 5 and 7 is set outside the horizontal auxiliary member 4 of the new panel. It must be longer than the length of the protruding portion of the existing steel tower that is projected, but the length of the temporary materials 5 and 7 in the longitudinal direction may be about the length of one piece of the main pillar 1. Therefore, the cost of the temporary material is low.

The rebuilding of the panel P is carried out in order from the panel P1 arranged at the lower end of the new steel tower T upward,
One panel is assembled up to the panel P6 in which the belly member 3 is formed in a K structure. That is, the panels are stacked by connecting the main columns 2 of the installed panel P1 to the main columns 2 of the second-stage panel P2 that has been lifted by a crane or the like, and then the panels P3.

After assembling the new panel P up to the panel 6, a power failure occurs, and the three sets of power transmission line bodies 12 attached to the existing steel tower t are removed to newly install the panel P.
Temporarily attach to 6. In addition, the existing steel tower t has each panel p
Is a double warren structure, and each panel is assembled in the same manner as the new panel T.
After being attached to the panel P of the new steel tower, they can be disassembled and removed in order from the upper panel set. Then, after removing the existing steel tower t, the temporary materials 5 and 7 are removed, and the main pillar material 2 and the horizontal auxiliary material 4, and the first diagonal material 6 and the second diagonal material 8 are directly coupled.

Next, the panels of the double warren structure above the panel P7 are assembled upward from the panel P7 in order. Then, the power transmission line body 12 temporarily attached to the panel P6 is removed, and the power transmission line body 12 is attached to the regular position of the panel P in three stages. Then, cancel the power cut,
A new steel tower is completed.

The dismantling and removal of the existing steel tower t is carried out when the power transmission line body 12 attached to the existing steel tower t is removed and temporarily attached to the panel P of the new steel tower T. Any panel may be used as long as it can be temporarily attached to the panel.

Further, in this embodiment, the panel P1
It is configured such that up to 6 are K-structured and panels 7 to 19 are double-waren structured, but the invention is not limited to this and can be appropriately changed depending on the total length of the steel tower. The same applies to the number of power transmission lines. However, it is desirable that the K-structured panel is a cross panel and a crossed panel, and the double warren-structured panel is an upper non-crossed panel.

[0030]

According to the present invention, since a new transmission line tower is constructed so as to change its direction by 45 degrees with respect to the existing transmission line tower, large-scale tower rebuilding work including reinforcement work can be performed. It can be performed within the site area of the existing steel tower. Therefore, it is possible to solve the problems such as additional purchase of the site, which have become increasingly difficult in recent years, and shorten the period for rebuilding the steel tower. Further, since temporary work is not required, cost can be reduced.

The panel P of the new steel tower is attached to the existing steel tower t.
Since the temporary material is provided so as to be disposed outside the panel p, it is possible to prevent interference with the existing steel tower at the time of assembling the panel, which is caused by changing the direction by 45 degrees.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing the foundations of a new steel tower and an existing steel tower according to an embodiment of the present invention.

FIG. 3 is a diagram showing panel sections of a steel tower rebuilding method according to the present invention.

FIG. 4 is a plan sectional view of the K-structure panel in FIG.

FIG. 5 is a front view of the K structure panel in FIG.

6 is a partial side sectional view of the K-structure panel in FIG.

[Figure 7] Conventional wrapping method

[Explanation of symbols]

 1 ... New foundation 2 ... Main pillar material 3 ... Belly material 4 ... Horizontal auxiliary material 5 ... 1st temporary material 6 ... 1st diagonal material 7 ... 2nd temporary material 8 ... 2nd diagonal material T ... New steel tower t ... Existing steel tower P ... New panel p ... Existing panel

Claims (2)

[Claims] 1. A method for rebuilding a transmission line tower comprising a plurality of stacked panels and a plurality of transmission line bodies, wherein a new steel tower foundation is constructed between existing steel tower foundations, The new steel tower is constructed by changing the direction of the steel tower at 45 degrees in a plan view with respect to the steel tower. 2. The panel comprises a main pillar member vertically arranged and a belly member horizontally arranged with respect to the main pillar member. At least a part of the panels is provided with a belly member including a K-shaped portion, and when the panels are assembled, a temporary member is provided on the belly member constituting the K-shape, and a part of the belly member is provided outside the existing panel. The method for constructing a transmission line tower as claimed in claim 1, wherein the construction is performed temporarily.