JP3424067B2 - Tower raising method - Google Patents

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 in order to further raise the ground height of overhead lines such as transmission and distribution lines stretched between tower bodies.

[0002]

2. Description of the Related Art With the development of urbanization in the suburbs of cities in recent years, new extensions and rebuilding of houses, etc. are being performed under and around the overhead lines of existing power transmission lines. There is a situation where there is a lack of separation. Also in the suburbs, the ground clearance of power transmission lines is becoming insufficient due to environmental changes such as the use of the area around the line ground and the introduction of large agricultural machinery. As a countermeasure against such lack of clearance and lack of ground clearance, it is necessary to raise the ground clearance of the existing transmission line even further.Temporary work is carried out as a measure to prevent power supply interruption during construction, and then the steel tower is built. The tower is being raised by replacing it. However, such countermeasures have problems that temporary construction work requires a large amount of construction cost and it is difficult to secure a site for the temporary route.

Therefore, various methods have been proposed for raising the existing steel tower in consideration of safety and economic efficiency, which allows the raising work to be performed in a state of overhead wire without performing temporary construction work. The first is to install an iron pillar in the existing steel tower and fix it to the upper part of the tower, then bid up the iron pillar with a hydraulic climbing device, then lift the raised part with the electric chain block and join it to the main leg material. Construction method, the second is to install the steel pillar device of the above-ground derrick inside the existing steel tower, the upper part of the steel tower is fixed and lifted up, and a new member is added to the middle part, and the third is inside the existing steel tower. It is a construction method in which a hoisting device including an iron pillar, a sprocket, and a hanging chain is installed, the hoisting chain is rolled up to raise the iron pillar, and the preassembled raising members are joined.

Further, as a fourth construction method, two steel towers are installed in the existing steel tower and connected to the upper part of the steel tower, the iron pillar is raised by two hydraulic climbing devices, and the raising member is connected to the middle portion. Double climbing method, 5thly, installing a raising device inside the existing steel tower and connecting with the steel tower, raising the existing steel tower using 4 power cylinders, and adding the new lower material In 6, the pedestal with jack screws is installed outside the existing steel tower, the existing steel tower and the jack screw are connected by the lifting beam, the jack screw is manually rotated to raise the steel tower, and the raising member is added to the manpower jack method. 7thly, a temporary steel tower is erected on the outside of the existing steel tower, connected to the existing steel tower with a two-stage receiving beam, the steel tower is raised by a screw rod and a hydraulic jack, and a raising member is added to the lower part. 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 wrap-up method in which a temporary arm is attached to this for temporary power transmission, then the existing steel tower is removed, a new steel tower is assembled and electric wires are transferred.

[0005]

However, since any of the above-mentioned construction methods uses a large device such as a lifting device or a hydraulic climbing device, a large work site for carrying in work around the existing tower body. Therefore, there is a problem that it is difficult to secure land in mountainous areas and urban areas. In addition, since a special and large-sized device is used, it takes a lot of days to carry it into the site, assembling it, dismantling it, removing it, etc., and it requires a skilled technique, and the construction cost increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and has the advantage that construction can be carried out within the site of an existing tower body, that the work site is not selected, and that no special large equipment is used. It is an object of the present invention to provide a tower body raising method that is simple and can shorten the construction period, does not require skilled technology, and can reduce the construction cost.

[0007]

[Means for Solving the Problems] The means of the present invention, which is configured to solve the above-mentioned problems, is provided in a state in which the upper side of the existing tower body, on which the arm supporting the overhead wire is projected, is surrounded. A first step of installing a temporary tower on the existing tower, after removing the overhead wire from the arm and attaching the temporary tower to the temporary tower,
A second step of removing the arm from the existing tower, providing a temporary arm to the temporary tower and attaching the overhead wire to the temporary arm, supporting the existing tower to the temporary tower Third, a lower fixed tower portion and an upper transfer tower portion surrounded by the temporary tower body are separated, and the transfer tower portion is raised to a desired height to be temporarily installed on the temporary tower body. Step, assembling a raising tower part by assembling the raising tower part between the fixed tower part and the transfer tower part, a fourth step, installing a new arm in the transfer tower part, and engaging the temporary arm A fifth step of engaging the overhead wire attached to the new arm and removing the temporary arm from the temporary tower;
A sixth step of removing the temporary tower body from the raised tower body.

Before the first step, a reinforcing tower is erected on the ground inside or outside the existing tower,
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.

By fixing the base portion of the reinforcing tower body to the foundation body of the existing tower body, the raising work can be performed easily, in a short period of time and at low construction cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 indicates an existing tower body standing on the ground A. 2, 2, ... consist of concrete columns that compose the existing tower body 1, and the ground A
The four base blocks 3 embedded in the base blocks 3 are the tower main bodies standing upright on the base blocks 2, 2, ..., The main columns 3A, 3A of the tower main body 3 whose lower ends are embedded in the respective base blocks 2 ...・
And a large number of beams 3B, 3B, ..., which are erected between the main columns 3A, 3A and spaced apart in the height direction, and brace 3C, 3C ,. Is formed into a tapered shape. 4A, 4B, and 4C are three upper braces, middle braces, and lower braces, which are horizontally projected from the upper left side of the tower body 3 (hereinafter, collectively referred to as left braces 4).
5A, 5B, and 5C are upper arms, middle arms, and lower arms (hereinafter,
In some cases, it is collectively referred to as the right armpiece 5. ). The left arm 4A, 4B, 4C has an upper line 6A, a middle line 6B, and an underline 6
C (hereinafter collectively referred to as overhead wire 1 depending on the case 6) is fastened, and upper wire 7A, middle line 7B, and underline 7C are attached to the right arm 5A, 5B, and 5C (hereinafter, depending on the case, it may be called overhead wire 7). They are collectively called).

Reference numeral 11 indicates a reinforcing tower located inside the existing tower 1 and 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). It is shown.). The reinforcing tower body 11 is intended to enhance the strength of the existing tower body 1 for raising work, and includes a base 12 in which base materials 12A, 12A made of H-shaped steel are connected in a cross shape,
It consists of a pair of half-split bodies 13A and 13B, and one half-split body 1
3A is fixed to the tip of the base material 12A, and the other half 1
3B is composed of a cylindrical foundation forming body 13, 13 ..., which is fastened by bolts and nuts, and a square-shaped steel tower 14 which is erected on the base 12. Each foundation formation 13 surrounds the foundation block 2 of the existing tower body 1 from the side.

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

After that, the steel tower raising work is carried out. As a first step, the temporary tower body 21 is installed (the temporary tower body 21 is also shown by a broken line in the figure in order to avoid complication with the existing tower body 1). The temporary tower body 21 has a lower end 21A at the steel tower 14
The upper part 14A of the existing tower body 1 is located near the upper end 14A of the existing tower body 1, and the upper side of the existing tower body 1 on which the left arm 4 and the right arm 5 are projected is surrounded by a four-sided rectangular tower. 1
Is supported via connecting members 22, 22, 22 (FIGS. 4 and 5).

As a second step after installing the temporary tower body 21, after removing the overhead wire 1 from the left arm 4 and temporarily fixing it to the temporary tower 21, the left arm 4 is removed from the existing tower 1. On the left side of the temporary tower 21, temporary arms 23A, 23B, 23C (hereinafter,
In some cases, it is collectively referred to as a provisional left arm 23. ) Is provided and the overhead wire 6 is fastened to the temporary left arm member 23 (FIG. 6). Next, remove the overhead wire 2 from the right arm 5 and temporarily fix it to the temporary tower body 21,
The right arm 5 is removed from the existing tower body 1 and, instead, provisional right arm 24A, 24B, 24C (hereinafter, collectively referred to as provisional right arm 24) are provided, and the overhead wire 2 is engaged with this. To wear. The provisional armpieces 23 and 24 are installed so as to be shifted downward with respect to the existing left armpiece 4 and right armpiece 5 so that they do not interfere with each other (FIG. 7).

When the transfer of the overhead wire 1 and the overhead wire 2 is completed as described above, the third step is performed. That is, the tower main body 3 of the existing tower body 1 is separated into the lower fixed tower portion 1A supporting the temporary tower body 21 and the upper transfer tower portion 1B surrounded by the temporary tower body 21. Next, using the temporary tower body 21, the transfer tower portion 1B is lifted up to a height h ₁ for raising the volume and temporarily installed on the temporary tower body 21 (see FIG. 8). The lifting operation of the transfer tower section 1B is performed by using a winch or the like installed in the temporary tower body 21. After the transfer tower section 1B is lifted up, the portion 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 and the fixed tower section 1A described later without a step.

In the next fourth step, the transfer tower section 1B is lifted up and then the replacement section 1C is removed from the fixed tower section 1A so that a space h ₂ formed between the transfer tower section 1B and the transfer tower section 1B is lifted up. 25 is assembled, and the raised tower body 26 which is raised to a desired height with respect to the height of the existing tower body 1 is assembled (FIG. 10). The raising tower portion 25 is sequentially assembled from the upper end of the fixed tower portion 1A upward and is connected to the lower end of the transfer tower portion 1B, but its configuration and 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, exchange of armrests and relocation of overhead lines are performed. That is, new arms 27A, 27B, and 27C (hereinafter, collectively referred to as left new arm 27 in some cases) are installed on the upper left side of the raised tower body 26 formed as described above, and attached to the temporary left arm 23. A certain overhead wire 6 is transferred to the new left arm 27, and the temporary left arm 23 is removed from the temporary tower 21 (Fig. 1).
1). Similarly, new arms 28A, 28B, and 28C (hereinafter, collectively referred to as right new arm 28) are installed on the upper right side of the raised tower body 26 and are attached to the temporary right arm 24 24. After the overhead wire 7 is transferred to the right new arm 28, the temporary right arm 24 is removed from the temporary tower 21 (FIG. 12). It should be noted that new left armpieces 27 and right new armpieces 28 may be new armpieces, or the right and left armpieces 4 and 5 removed from the existing steel tower 1 in the second step are used again as new armpieces. It is also possible.

As a final sixth step, a work for removing the temporary tower body 21 from the raised tower body 26 is performed. This removal work is performed by using a winch or the like installed on the ground and sequentially disassembling it from above (Fig. 14). When the raising work is completed as described above, the reinforcing tower body 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-split bodies 13A and 13B to remove the concrete adhered to the foundation block 2. . As described above, since the reinforcement tower 11 is configured to install the foundation forming body 13 by using the foundation block 2 of the existing tower body 1, a special case such as excavation of the ground for installing the reinforcement tower 11 is required. There is an advantage that construction can be eliminated and the construction period can be shortened.

In this embodiment, the reinforcing tower 11 is installed to enhance 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 it in consideration of its strength.

In the embodiment, the reinforcing tower body 11 is located inside the existing tower body 1 and is erected on the ground.
1 may be positioned outside so as to surround 1 and stand on the ground.

[0021]

Since the present invention is constructed as described above in detail, it has the following effects. (1) Since the construction is performed using the existing tower, the construction is simple, the construction period can be shortened and the construction cost can be reduced as compared with the conventional technology. (2) Since heavy equipment such as lifting equipment and hydraulic climbing equipment is not used, it is possible to carry out raising work within the site of the existing tower body, and since the work place is not selected, the raising work can be done anywhere in the mountains, cultivated land, and urban areas. be able to. (3) No special machines, tools, and techniques are required for the raising work, and the work is easy because the ordinary tower assembly technique is sufficient, and the work is possible even if not a skilled worker. (4) The existing tower body is located inside or outside the existing tower body, and the reinforcing tower body is erected on the ground, and the reinforcing tower body is connected to the existing tower body. It is possible to enhance the strength of the existing tower while utilizing the above, and to enhance the safety of the raising work. (5) By installing the reinforcement tower by fixing it to the foundation of the existing tower, the raising work can be done easily, in a short period of time and at a low construction cost, and after the construction is completed, Removal work can be done easily.

[Brief description of drawings]

FIG. 1 is a front view showing the overall structure of an existing tower body.

FIG. 2 is an exploded perspective view of essential parts showing a structure in which a base of a reinforcing tower is attached to a base block of an existing tower.

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

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

FIG. 5 is an explanatory diagram in which a temporary tower is installed with the upper side of an existing tower being surrounded.

FIG. 6 is an explanatory diagram showing a state in which 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 diagram showing a state in which temporary arms are provided on both sides of the upper part of the temporary tower.

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

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

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

FIG. 11 is an explanatory diagram 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 raised tower body.

FIG. 13 is an explanatory diagram showing a step of removing the temporary tower body from the raised tower body.

FIG. 14 is an explanatory view showing the middle of the step of removing the reinforcing tower body from the raised tower body.

[Explanation of symbols]

1 Existing tower 2 basic blocks (basic body) 4, 5 armor 11 Reinforcement tower 13 Foundation formation (foundation) 21 Temporary tower body 23, 24 provisional arm 25 Lifting tower 26 Raised tower 27,28 new arm

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahisa Takahashi, Masanobu Takahashi, 4-3, 4-chome South Yoshino, Sunagawa, Hokkaido Hokkaido Electric Power Company, Sapporo Branch Sunagawa Power Station (72) Inventor Manabu Hosokawa Tondanishi, Kitami, Hokkaido 223 Address 1 Kita Kaido Electric Power Co., Inc. Asahikawa Branch Kitami Electric Power Station (72) Inventor Toshihiro Nakami 2-8-1, Kikusui, Kikusui, Shiroishi-ku, Sapporo, Hokkaido (72) Inventor Shuji Mitamura Sapporo, Hokkaido Hokkai Electric Works Co., Ltd. 2-8-1 Kikusui, Shiroishi-ku, Yokohama (72) Inventor Hiroaki Nagahama 1-1524 Sakaemachi, Takigawa City, Hokkaido Hokkai Electric Works Co., Ltd. Iwamizawa Branch Takigawa Sales Office (56) Reference Literature JP-A-53-110235 (JP, A) JP-A-59-195968 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04H 12/34 E04H 12/10 H02G 1/02 307

Claims (3)

(57) [Claims] 1. A method for raising a tower body comprising the following steps: (a) A temporary tower body is attached to the existing tower body in a state of surrounding the upper side of the existing tower body where the arm supporting the overhead wire is projected. First step of installing, (b) After removing the overhead wire from the arm and attaching it to the temporary tower, removing the arm from the existing tower, and providing the temporary arm to the temporary tower. A second step of attaching the overhead wire to the temporary arm, (c) a lower fixed tower portion that supports the existing tower body to the temporary tower body, and an upper transfer tower portion that is surrounded by the temporary tower body The third step of temporarily separating the transfer tower from the fixed tower and the transfer tower, and raising the transfer tower to a desired height to temporarily install the temporary tower in the temporary tower. According to the fourth step of assembling the raised tower body, (e) a new arm is installed in the transfer tower and the overhead wire attached to the temporary arm is 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. Before the first step, a step of standing a reinforcing tower body on the ground inside or outside the existing tower body and connecting the reinforcing tower body to the existing tower body is performed. The method for raising a steel tower according to claim 1, wherein 3. The base portion of the reinforcing tower body is fixed to the base body of the existing tower body.
The method of raising the steel tower as described.