JP2000110407A - Tower body raising construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a construction in an existing tower body site, facilitate a construction and shorten a construction period because a construction method is unique and does not use a large device, eliminate a skilled technique, and reduce a construction cost. SOLUTION: A tower body raising construction method comprises the 1st step of surrounding an existing tower body 1 upper side having an arm metal by a temporary tower body 21, the 2nd step of moving overhead wires 6A to 7C to the temporary tower body 21, removing the arm metal, installing temporary arm metals 23A to 24C onto the temporary tower body 21, and fixing the overhead wires 6A to 7C, the 3rd step of separating a moving head part 1B from the existing tower body 1 and raising it to a desired height utilizing the temporary tower body 21, the 4th step of assembling a raising tower part between a fixed tower body 1A and a moving tower body 1B so as to form a raised tower body, the 5th step of installing a new arm metal on the moving tower body 1B, fixing the overhead wires 6A to 7C, and removing the temporary arm metals 23 and 24, and the 6th step of removing the temporary tower body 21 from the raised tower body 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower body raising method for raising a tower body so as to further increase the ground height of an overhead line such as a transmission / distribution line stretched between the tower bodies.

[0002]

2. Description of the Related Art With the recent development of urbanization in the suburbs of urban areas, new construction and rebuilding of houses and the like under and around existing transmission lines have been carried out. There is a situation where insufficient separation occurs. In addition, in suburbs, there are situations where the ground clearance of power transmission lines is short due to environmental changes due to the use of the surroundings of the line ground and the introduction of large agricultural machines. As a countermeasure against such a shortage of separation and a shortage of ground clearance, it is necessary to further raise the ground clearance of the existing transmission line, and construct a steel tower after conducting temporary construction as a measure to prevent power supply interruption during construction. The tower is raised by replacing it. However, such countermeasures have problems such as a large amount of construction cost required for temporary construction and difficulty in securing land for a temporary route.

[0003] Therefore, various methods have been proposed for raising the existing steel tower in consideration of safety and economy because the raising work can be performed while the wire is being wired without performing the temporary construction work. First, after installing a steel pole in an existing steel tower and fixing it to the upper part of the steel tower, the steel pole is competed by a hydraulic climbing device, and then the raised part is lifted by an electric chain block and joined to the main landing gear. The second method is to set up a derrick iron column device above the existing tower, fix the upper part of the tower, lift it up, and add new members to the middle part. The third method is to install it inside the existing tower. This is a method of installing a lifting device consisting of a steel pole, a sprocket, and a hanging chain, winding up the hanging chain to raise the steel pole, and joining a pre-assembled raising member.

Further, as a fourth construction method, two steel towers are installed in an existing steel tower, connected to the upper part of the steel tower, the steel pole is raised by two hydraulic climbing devices, and a raising member is connected to an intermediate part. Fifth, double climbing method, fifth step is to install a raising device inside the existing tower, connect it to the tower, lift the existing tower using four power cylinders, and add the new lower member 6, a stand with jack screws is installed outside the existing tower, the existing tower and the jack screw are connected by an elevating beam, the jack screw is rotated manually to raise the tower, and a manual jacking method is used to add the raising members. Seventh, a temporary tower is erected outside the existing tower, connected to the existing tower by two-stage beams, the tower is lifted up by threaded rods and hydraulic jacks, and a raising member is added at the bottom. Tower elevated method, the eighth, the assembly part of the new towers by applying a new foundation to the outside of the existing foundation,
There is a wrapping method in which a temporary arm is attached and temporary power is transmitted, then the existing steel tower is removed, a new steel tower is assembled, and electric wires are relocated.

[0005]

However, in any of the above-mentioned construction methods, a large work site for carrying in work around the existing tower body or the like is required because large devices such as a lifting device and a hydraulic climbing device are used. Therefore, there is a problem that it is difficult to secure a land in a mountain area or an urban area. In addition, since a special and large-sized device is used, it takes many days to carry in, assemble, disassemble, and remove the device to the site, there is a problem that a skilled technique is required, and construction costs are increased.

The present invention has been made in view of the above-mentioned problems of the prior art, and has the advantage of being able to perform construction on the site of an existing tower, so that it does not require any work site. It is an object of the present invention to provide a tower raising method in which the construction time is simple, the construction period can be shortened, no skilled technique is required, and the construction cost can be reduced.

[0007]

Means for Solving the Problems The means of the present invention configured to solve the above-mentioned problem is provided in a state in which the existing tower body surrounds the upper side where the arm for supporting the overhead wire is projected. A first step of installing a temporary tower on the existing tower, after removing the overhead wire from the arm bar and engaging with the temporary tower,
A second step of removing the arm from the existing tower, providing a temporary arm on the temporary tower, and attaching the overhead wire to the temporary arm, supporting the existing tower with the temporary tower The third fixed tower section is separated into a lower fixed tower section and an upper transfer tower section surrounded by the temporary tower body, and the transfer tower section is raised to a desired height and temporarily installed in the temporary tower body. A fourth step of assembling a raising tower body by assembling a raising tower section between the fixed tower section and the transfer tower section, and installing a new arm in the transfer tower section, A fifth step of attaching the worn overhead wire to the new arm bar and removing the temporary arm bar from the temporary tower body;
A sixth step of removing the temporary tower from the raising tower.

Before the first step, a reinforcing tower body is erected on the ground so as to be located inside or outside the existing tower body,
By performing the step of connecting the reinforcing tower to the existing tower, the strength of the existing tower is increased while using the existing tower,
The safety of raising work can be improved.

Further, by fixing the foundation of the reinforcing tower to the foundation of the existing tower, the raising work can be performed easily, in a short time and at low construction cost.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2, reference numeral 1 denotes an existing tower standing on the ground A. 2, 2,... Are made of concrete columns composing the existing tower 1, and the ground A
, And 3 are tower bodies erected on the base blocks 2, 2,..., And the tower main body 3 has main pillars 3A, 3A,.・
, A number of beams 3B, 3B,... Erected between the main columns 3A, 3A at a distance in the height direction, and braces 3C, 3C,. To form a tapered shape. Reference numerals 4A, 4B, and 4C denote three upper arm bars, middle arm bars, and lower arm bars projecting horizontally from the upper left side of the tower main body 3 (hereinafter, sometimes collectively referred to as left arm bars 4).
5A, 5B, and 5C denote upper, middle, and lower arms (hereinafter, referred to as horizontal arms) projecting horizontally from the upper right side of the tower main body 3.
In some cases, the right arm 5 is collectively referred to. ). The left arm 4A, 4B, and 4C have an upper line 6A, a middle line 6B, and an underline 6
C (hereinafter sometimes collectively referred to as No. 1 overhead line 6) is attached, and the right arm bars 5A, 5B, and 5C are connected to the upper line 7A, the middle line 7B, and the lower line 7C (hereinafter, sometimes referred to as the No. 2 overhead line 7). Collectively).

Reference numeral 11 denotes a reinforcing tower which is located inside the existing tower 1 and is erected on the ground A (the reinforcing tower 11 is indicated by a broken line in the figure in order to avoid complication with the existing tower 1). Shown). The reinforcing tower body 11 is for increasing the strength of the existing tower body 1 for raising work, and a base 12 in which base materials 12A, 12A,.
A pair of halves 13A and 13B, one half halves 1
3A is fixed to the tip of the base material 12A, and the other half body 1
3B is composed of cylindrical base formations 13, 13,... To be fastened by bolts and nuts, and a square steel tower 14 erected on the base 12. Each foundation formation 13 surrounds the foundation block 2 of the existing tower 1 from the side.

The construction of the reinforcing tower 11 will now be described. First, each base block 2 is covered with a waterproof sheet such as a vinyl sheet and cured, and the outside is covered with a base forming body 13.
After that, the base 12 is integrally fixed to the foundation blocks 2, 2,... By placing concrete between the foundation forming body 13 and the foundation block 2. Thereafter, the steel tower 14 is erected on the base 12 inside the existing tower 1 in the same manner as in the conventional method, and the existing tower 1 is connected with a connecting member (not shown).
It is connected and supported. The height of the reinforcing tower 11 is
The upper end 14A is located at a position where it intersects with the existing tapered tower 1.

[0013] Thereafter, the tower is raised. As a first step, a temporary tower body 21 is installed (note that the temporary tower body 21 is also indicated by a broken line in the figure to avoid complication with the existing tower body 1). The temporary tower body 21 is connected to the lower
Of the existing tower body 1 is a square tower having four sides surrounding the upper side of the existing tower body 1 from which the left arm 4 and the right arm 5 are projected. 1
Are supported via connecting members 22, 22, 22 (FIGS. 4 and 5).

As a second step after the temporary tower 21 is installed, the overhead wire 6 is detached from the left arm 4 and temporarily fixed to the temporary tower 21, and the left arm 4 is removed from the existing tower 1. Temporary arm members 23A, 23B, 23C (hereinafter, referred to as "temporary arm members")
In some cases, it is collectively referred to as a temporary left arm 23. ) Is provided, and the overhead wire 6 is engaged with the temporary left arm bar 23 (FIG. 6). Next, the overhead wire 7 is removed from the right arm 5 and temporarily fixed to the temporary tower 21.
The right arm 5 is removed from the existing tower 1, and provisional right arms 24A, 24B, 24C (hereinafter collectively referred to as temporary right arm 24 in some cases) are provided instead, and the No. 2 overhead line 7 is connected thereto. To wear. The provisional arms 23 and 24 are shifted downward with respect to the existing left arm 4 and right arm 5 so that they do not interfere with each other (FIG. 7).

When the transfer of the No. 1 overhead line 6 and the No. 2 overhead wire 7 is completed as described above, the third step is performed. That is, the tower body 3 of the existing tower body 1 is separated into a lower fixed tower section 1A that supports the temporary tower body 21 and an upper transfer tower section 1B that is surrounded by the temporary tower body 21. Then, by using the temporary tower body 21 by lifting the height h ₁ minute to raising the relocation tower section 1B temporarily placed in the temporary tower body 21 (see FIG. 8). The lifting work of the transfer tower section 1B is performed by using a winch or the like installed on the temporary tower body 21. After lifting the transfer tower section 1B, the part surrounded by the erection tower body 21 on the upper side of the fixed tower section 1A is removed as a replacement section 1C (see FIG. 9). This is for continuously connecting the raising tower section 25 described later and the fixed tower section 1A without any step.

[0016] The next fourth step, raising a tower section to the space h ₂ which is formed between the relocation tower portion 1B by removing the replaceable unit 1C from the fixed bed section 1A after lifting the relocation tower portion 1B 25 is assembled, and a raised tower 26 raised to a desired height with respect to the height of the existing tower 1 is assembled (FIG. 10). The raising tower section 25 is sequentially assembled upward from the upper end of the fixed tower section 1A and connected to the lower end of the transfer tower section 1B, but the configuration and the assembly work are basically different from those of the tower body 3 and the reinforcing tower body 11. There is no place.

In the fifth step, replacement of the arm and transfer of the overhead wire are performed. That is, new arms 27A, 27B, and 27C (hereinafter, sometimes collectively referred to as new left arms 27) are installed on the upper left side of the raised tower body 26 formed as described above, and are engaged with the temporary left arm 23. A certain overhead line 6 is moved to the new left arm bar 27, and the temporary left arm bar 23 is removed from the temporary tower 21 (FIG. 1).
1). Similarly, new arms 28A, 28B, 28C (hereinafter, sometimes collectively referred to as right new arm 28) are installed on the upper right side of the raising tower 26, and are attached to the temporary right arm 24. After the overhead wire 7 is moved to the right new arm bar 28, the temporary right arm bar 24 is removed from the temporary tower 21 (FIG. 12). A new arm may be used for the left new arm 27 and the right new arm 28, or the right and left arms 4, 5 removed from the existing steel tower 1 in the second step may be used again as new arms. It is also possible.

As the last sixth step, the work of removing the temporary tower 21 from the raising tower 26 is performed. This removal operation is performed by sequentially disassembling from above using a winch or the like installed on the ground (FIG. 14). When the raising work is completed as described above, the reinforcing tower 11 is removed. The steel tower 14 is dismantled in the same manner as the temporary tower body 21, and the foundation forming body 13 forming the base 12 separates the pair of half bodies 13 </ b> A and 13 </ b> B to remove the concrete adhered to the foundation block 2. . As described above, since the reinforcing tower 11 is configured to install the foundation forming body 13 by using the foundation block 2 of the existing tower 1, special construction such as excavating the ground for installation of the reinforcing tower 11 is performed. There is an advantage that the construction can be omitted and the construction period can be shortened.

In the present embodiment, the reinforcing tower 11 is installed to increase the strength of the existing tower 1. However, the reinforcing tower 11 is required depending on the height of the existing tower 1 and the height of the raised tower. It is sufficient to install them in consideration of their strength.

In the embodiment, the reinforcing tower 11 is located above the existing tower 1 so as to be located inside the existing tower 1.
1 may be located outside on the ground so as to surround 1.

[0021]

The present invention has the following advantages because it is constructed as described above. (1) Since the construction is performed using the existing tower, the construction is simple, the construction period can be shortened compared with the conventional technology, and the construction cost can be reduced. (2) Since no heavy equipment such as a lifting device or a hydraulic climbing device is used, it is possible to raise the work on the site of the existing tower body. be able to. (3) Special machines, tools and techniques are not required for the raising work, and the work is simple because ordinary tower assembly techniques are sufficient, so that the work can be performed by non-skilled workers. (4) An erecting tower is located on the ground inside or outside the existing tower, and the reinforcing tower is connected to the existing tower, so that the existing tower is installed on the site of the existing tower. It is possible to increase the strength of the existing tower body while using it, and to increase the safety of raising work. (5) By installing the reinforcing tower body fixed to the foundation of the existing tower body, the raising work can be performed easily, in a short time and at low construction cost. Removal work is also easy.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire configuration of an existing tower body.

FIG. 2 is an exploded perspective view of a main part showing a configuration in which a base of a reinforcing tower is attached to a foundation block of an existing tower.

FIG. 3 is an explanatory view of a state in which a reinforcing tower body is erected inside an existing tower body.

FIG. 4 is an explanatory view showing a middle of a process of installing a temporary tower on an upper side of an existing tower.

FIG. 5 is an explanatory view in which a temporary tower is installed in a state surrounding an upper side of an existing tower.

FIG. 6 is an explanatory view showing a state where a temporary arm is provided on one side of the temporary tower and the arm is removed from the existing tower.

FIG. 7 is an explanatory view showing a state in which provisional arm members are provided on both upper sides of a temporary tower body.

FIG. 8 is an explanatory view showing a state where an existing tower body is separated into a fixed tower section and a transfer tower section, and the transfer tower section is pulled up.

FIG. 9 is an explanatory view showing a step of removing a replacement section from a fixed tower section of an existing tower body.

FIG. 10 is an explanatory view showing a step of forming a raising tower body by connecting a raising tower section between a fixed tower section and a transfer tower section.

FIG. 11 is an explanatory view showing a process of removing a temporary arm from the temporary tower and installing a new arm on the raised tower.

FIG. 12 is an explanatory view showing a state in which a new arm is installed on the raising tower body.

FIG. 13 is an explanatory view showing a step of removing the temporary tower from the raising tower.

FIG. 14 is an explanatory diagram showing a middle of a step of removing the reinforcing tower from the raising tower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing tower 2 Base block (base) 4, 5 Arms 11 Reinforcement tower 13 Foundation formation (base) 21 Temporary tower 23, 24 Temporary arm 25 Raising tower 26 Raising tower 27, 28 New Armpit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahisa Takahashi 4-3-1 Minami Yoshino 4-chome Minami, Sunagawa-shi, Hokkaido Inside the Sunagawa Power Station, Sapporo Branch, Hokkaido Electric Power Company, Inc. (72) Inventor Manabu Hosokawa 223-1 Kita-michi Electric Power Co., Inc. Asamikawa Branch Kitami Electric Power Station (72) Inventor Toshihiro Nakami 2-1-1, Kikusui, Shiroishi-ku, Sapporo-shi, Hokkaido Within Kitakai Electric Works Co., Ltd. 2-8-1-21, Kikusui, Shiroishi-ku, Kita-shi The inside of Hokkai Electric Works Co., Ltd. (72) The inventor Hiroaki Nagahama 1-15-24, Sakaemachi, Takikawa-shi, Hokkaido Hokkai Electric Works Co., Ltd.

Claims (3)

[Claims] 1. A tower body raising method comprising the following steps: a) A temporary tower body is attached to the existing tower body in a state surrounding an upper side of the existing tower body where an arm for supporting an overhead wire is projected. A first step of installing, (b) after removing the overhead wire from the arm bar and engaging the temporary tower body, removing the arm bar from the existing tower body, and providing a temporary arm bar on the temporary tower body; A second step of attaching the overhead wire to the temporary arm, a lower fixed tower section supporting the existing tower body to support the temporary tower body, and an upper transfer tower section surrounded by the temporary tower body; A third step of elevating the transfer tower to a desired height and temporarily installing the temporary tower in the temporary tower, and d. Assembling a raising tower between the fixed tower and the transfer tower. A fourth step of assembling the raising tower body, e. Installing a new arm in the transfer tower section, and connecting the overhead wire attached to the temporary arm to the overhead wire. Fifth step, a sixth step of removing the said temporary tower body from f the raised tower body removing the tentative cross-arm from the temporary tower body is engaged with the Tadashiude gold. 2. The method according to claim 1, wherein before the first step, a reinforcing tower is erected on the ground inside or outside the existing tower, and the reinforcing tower is connected to the existing tower. The method for raising a steel tower according to claim 1, wherein 3. The foundation of the reinforcing tower is fixed to the foundation of the existing tower.
The steel tower raising method described.