JPS5926746B2 - Steel tower raising method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for raising the height of steel tower structures for power transmission lines, broadcasting antennas, water tanks, advertisements, etc.

For example, in the case of power transmission line towers, in recent years, as urban areas have become overcrowded, buildings have been constructed close to existing power lines, making it necessary to raise the height of the power lines. are often seen.

Conventionally, various methods have been tried to raise the height of such steel towers.

For example, a high bar-shaped steel pole is installed at the center of the steel tower, and a wire or rope is attached to support the entire steel tower with the lower end removed, or the top of the steel tower with the middle section removed, and a wire or rope is attached to the steel tower through a roller at the top of the steel tower. There is a method of raising the height of the steel tower by lifting the entire or upper part of the steel tower by tensioning and then attaching a new tower leg or intermediate component.

In this method, since the height of the steel column is high, the upper part of the steel tower tends to sway due to wind loads or deflection of the steel column, etc. Also, since the steel tower is supported and lifted using wires or ropes, it lacks stability. Another disadvantage is that there is a limit to the strength of the rope, which limits the size and height of the tower.

Further, in the method of attaching all the intermediate components, the strength of the components below the attachment point is only that of the old design, so there is a drawback that the raised height is limited within the design tolerance.

Another method is to install a frame structure on the outside of the steel tower and raise it up using an upper beam cylinder that supports the upper steel tower (Special Publication No. 32526/1983), or to install a frame structure on the inside of the frame structure. There is a method in which the upper part of the steel tower placed on the steel tower is raised upward from the bottom (% Publication No. 48-26614), and all the legs of the steel tower are attached below that.

These methods make it possible to create a frame structure that is superior in terms of strength, and there are no restrictions on the height or raised height of the steel tower. However, it has the disadvantage that it is not possible in such narrow spaces with no open space or where it is difficult to secure land.

In addition, with either method, there are problems such as a lack of stability due to lateral vibration of the steel tower during construction, instability when raising the tower, problems with worker safety, and the time it takes to assemble the structure. For example, it is impossible to raise the height of a transmission line tower while it is in use, for example, it is impossible to raise the height of a transmission line tower with live overhead wires, and the disadvantage is that raising the height requires a long-term power outage or temporary construction for bypass power transmission. was there.

The present invention solves the above-mentioned problems.By installing a specially constructed raising device inside the steel tower and using a special construction method, the work site can be kept small and temporary construction is not required. , very economical 1. h, good workability,
It is an object of the present invention to provide a method and device for raising the height of a steel tower, which is highly safe and can be raised while in use, for example, in a power transmission tower while the overhead wire is still live, and which can be applied to large steel towers.

The present invention provides a method for raising the height of a steel tower by adding the lower end legs of the steel tower. A box having a fixed pedestal and at least three pillars above the fixed pedestal, each of which is slidably formed on each of the pillars of the fixed pedestal, and having a connecting device on the top for firmly supporting the legs of an existing steel tower. an elevating pedestal of a predetermined height consisting of a shaped frame body, and a jack for raising and lowering the elevating pedestal on the outside or inside of the support of the elevating pedestal; (c) the lower ends of the legs of the steel tower are entirely removed from the ground to support the steel tower on the fixed pedestal and the elevating pedestal; (d) the jack is raised to the elevating pedestal; be raised by one stroke along with the steel tower, and temporarily fix the elevating pedestal to the fixed pedestal, or, after raising the elevating pedestal by one stroke and temporarily fixing the elevating pedestal, continue to lower the upper end of the jack to fix the elevating pedestal to the fixed pedestal. Reconnecting downward, lifting the elevating pedestal by one stroke and temporarily fixing the elevating pedestal at least one time while there is margin for the overlapping height of the elevating pedestal with respect to the fixed pedestal (hereinafter referred to as the wrap distance); e) Every time there is no margin in the wrap allowance due to one or more operations of raising and temporarily fixing the elevating pedestal in (a), a lower structure including the support of a predetermined height below the elevating pedestal (f) After the height above the ground of the steel tower reaches a predetermined height by the operations in (d) and (e), the legs of the tower are This is a steel tower raising method characterized by completely connecting the lower end of the steel tower with a newly constructed lower leg part assembled in advance, and a steel tower raising device used therein.

In the present invention, a steel tower refers to a steel tower for power transmission lines, broadcasting antennas, water storage tanks, advertising, etc., which is raised regardless of whether it is in use or not, or a tower in which only the upper part of the tower is assembled in advance at the time of construction. This also includes raising the top and adding the bottom part.

Hereinafter, the present invention will be explained by examples using the drawings.

Here, we will mainly explain power transmission line towers as an example.
The present invention is not limited to this, but can be widely applied to other steel towers mentioned above.

Figures 1A to 1E are block diagrams shown in the order of work steps to explain a construction method for raising a steel tower according to an embodiment of the present invention, and Figure 2 is a side view showing an example of a raising device used in the construction method. It is a diagram.

In the figure, 1 is the existing steel tower, and the figure shows the angle iron square steel tower.

2 is a newly installed lower leg section that will become the lower part of the new leg section after raising the height of the steel tower 1, and will be assembled on a strong new foundation outside the steel tower.

The assembly of the new lower leg 2 may be done in the first step as shown in Figure A, or the lower end 3 of the leg of the existing steel tower 1 of c5 is connected to the lower leg 2 of the new construction as shown in Figure A. It may be done at an appropriate stage until the existing steel tower 1 is raised, or it may be added to the lower part of the existing steel tower 1 one after another.

Reference numeral 4 denotes a raising device, which is installed inside the steel tower 1 as shown in Figure A.

The elevating device 4 is shown in detail in FIG. 2 and is comprised of a fixed pedestal 5, an elevating pedestal 6, and a jack 7, for example, an electric jack.

The fixed frame 5 consists of a box-shaped frame body having four supports 9 at the four corners of a rectangular plane.
10 are provided.

The fixed pedestal 5 is firmly fixed with bolts onto a fixed pedestal foundation 8 provided in advance.

This foundation 8 is constructed by installing, for example, a girder made of large H-beams that diagonally connects the legs 11 of the steel tower 1 on a reinforced concrete base, and both ends of which are connected to the legs 11 with bolts. The equipment is designed to safely withstand not only the weight of the steel tower 1 and the raising device 4 but also the designed wind, and the horizontal displacement of the steel tower can be held within a predetermined value even if the wind blows during the lifting operation. It is what was done.

The elevating pedestal 6 consists of a box-shaped frame body having four pillars 12 at the four corners of a rectangular plane, and the four pillars 12 are configured to be able to slide vertically on the outside of the four pillars 9 of the fixed pedestal. has been done.

Figure 3 is a diagram showing an example of the configuration of the sliding part of this support, where Figure A is a side view showing the part on which the support of the picture mount slides, and Figure 0 is a cross-sectional view taken along A-A' in Figure A. Figure C is a front view showing the roller attached to the support of the fixed frame in Figure A.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

As shown in the figure, the outside of the support 9 and the inside of the support 12 are arranged with a predetermined gap, for example, 30 mm, and on the outside above the support 9 of the fixed frame, there are a plurality of A roller 13 is attached to the pillar 9 and serves to smooth the sliding movement between the outside of the pillar 9 and the inside of the pillar 12.

The device for smoothing this sliding may be other than rollers, or may be rollers of other shapes.

Note that the pillars 12 of the elevating frame 6 may be arranged inside the pillars 9 of the fixed frame 5 so as to be slidable.

As shown in FIG. 2, a connecting beam 14 is provided on the upper surface of the elevating frame 6, and the ends extending on both sides are firmly connected to the supports 15 of the legs of the steel tower 1. , a picture mount 5 and a frame 6 support the steel tower 1.

Note that the connection between the upper part of the elevating frame 6 and the support column 15 of the steel tower 1 does not necessarily have to be a connecting beam as shown in the figure;
It is fine as long as it strongly supports the

Alternatively, by installing a c5 elevating frame 6 above the fixed frame 5 and sliding the support 12 of the elevating frame 6 onto the column 9 of the fixed frame 5 with their parts overlapping each other, the elevating frame 6 can be attached to the fixed frame 5. On the other hand, it can be raised and lowered freely.

In order to change the height of expansion and contraction of this picture trestle depending on the stage of work and temporarily fix it in a predetermined position to support the steel tower 1, each support 9 and 12 of the picture trestle has a vertical direction. Bolt holes 16 (FIG. 3, A) are provided at predetermined intervals.

A plurality of bolt holes 16 are usually provided at one location at appropriate intervals for minute adjustment of the height.

As the elevating pedestal 6 rises, the sliding length with respect to the fixed pedestal 7 becomes shorter and becomes insufficient, so the lower part of the elevating pedestal 6 is
Lower structure 17 (FIG. 1, c,
2), for example, in FIG. 2, a flange 18 is provided, and the lower structure 17
It is designed to be connected to the bolt by machining.

In addition, jacks 7 are placed on the outside of each of the four corner supports 9 and 12 of the picture mount 5 and 6 (Figures 1 and 2).
, its upper end is connected to connection portions 19 provided at predetermined intervals in the vertical direction of the support 12 of the elevating frame 6 (FIG. 2),
The lower end is fixed and supported by a fixed frame foundation 8 on the ground.

Due to the structure, the elevating frame 6 is lifted up by the jack 7, and the upper end of the jack 7 is sequentially moved to the elevating frame 6.
By changing the connection to the lower connecting part 19, the height of the elevating frame 6 can be increased sequentially.

Since the four jacks 7 need to be raised in synchronization, an easily adjustable electric jack is appropriate. Preferably, a pole screw jack is used to ensure that the load is held securely and safely while the machine is stopped. be.

Note that although the jacks 7 are arranged outside the columns 9 and 120 of the picture mount in the figure, they may also be arranged inside the columns 9 and 12.

In addition, the shape of the fixed pedestal 5 and the elevating pedestal 6 is shown as having a rectangular planar shape in the figure, but it is determined in accordance with the planar shape of the existing steel tower, for example, for a triangular steel tower. For other polygonal steel towers, a polygonal planar structure with multiple supports is suitable.

In short, any shape can be used as long as it has a structure that can stably support the steel tower inside the steel tower.

Next, a construction method for raising the height of the existing steel tower 1 using the height-raising device 4 configured as described above will be explained using FIG. 1.

First, as shown in Figure A, the raising device 4 is installed inside the steel tower 1 in the order of the fixed pedestal 5, the elevating pedestal 6, or the jack 7.

Also, the connecting beam lCa on the upper surface of the elevating frame 6 is connected and fixed to the support column 15 of the leg of the steel tower 1.

Next, as shown in Ross, the entire lower end 3 of the leg of the steel tower 1 is removed from the ground, and the entire steel tower 1 is supported by a fixed frame 5 and an elevating frame 6.

Next, when the four jacks 7 are synchronized and raised, the elevating frame 6 rises together with the steel tower 1.

The rising height is 701 strokes, for example 1.5
Does it rise when it reaches m? In order to temporarily fix the elevating pedestal 6 to the fixed pedestal 5, a fixing device, for example, a bolt hole 16 (the third
Tighten the bolts using Figure A).

Here, if the necessary overlap height (lap height) of the elevating pedestal 6 with respect to the fixed pedestal 5, for example 1.5 m or more, is expected to disappear due to the next stroke rise of the jack 701,
As shown in the figure, a lower structure 17 of a predetermined height is added below the elevating frame 6.

If the above-mentioned wrap allowance is sufficient or if the lower structure 17 is added, remove the upper end of the jack 7 from the connection part 19 (Fig. 8) J of the lifting frame 6, lower the jack 7, and return it to its original position. After reconnecting the upper end to the lower connection part 19, remove the temporary fixing bolt of the picture mount, raise the elevating pedestal 6 by one stroke again with the jack 7 as shown in Figure 8, and then remove the picture in the same manner as described above. Temporarily fix the stand.

If the wrap fee is expected to disappear with the next increase,
The lower structure 17 is added below the elevating frame 6 in the same manner as described above.

That is, while there is margin for the lap of the lifting pedestal 6, the lifting pedestal 601 stroke by the jack 7 and the above-mentioned temporary fixing are performed at least once (repeated once or twice or more), and the lifting pedestal 601 is stroked upward by the jack 7 (repeated once or twice or more). Each time it runs out, a lower structure 17 of a predetermined height is sequentially added below the elevating frame 6.

Note that if the raised height is satisfied only by raising the main body of the elevating frame 6, the lower structure 17 is not necessarily required.

The height of the steel tower 1 is increased by repeating the above-mentioned lifting, temporary fixing, and addition of the elevating frame 6 by the jacks 7 as often as necessary (varnish).

For example, if one stroke of the jack 7 is 1.5 m and the height of the elevating pedestal is 3 m each time, the height of the elevating pedestal may be added 5.1 times for every two lifts by the jack.

All of the above-mentioned operations are performed on the landing 10 (Fig. 2) provided on the fixed frame 5 and on the ground, and are performed in relatively low places with a height of no more than 6 m, so that the work is safe. .

After the height of the steel tower 1 above ground reaches a predetermined height by the above-described operation, the lower end 3 (varnish) of the leg of the steel tower and the newly installed lower leg 2 assembled in advance are connected and fixed.

Thereafter, after removing the fixings (Fig. 2) between the support columns 15 of the legs of the existing steel tower 1 and the connecting beams 14 of the lifting frame 6, the raising device 4 is removed mainly in the reverse order of assembly, and the height of the steel tower is raised. Construction is completed (Figure E).

As described above, the present invention has the following effects when the steel tower is raised by adding the lower end legs of the steel tower.

■ Since it is installed on the raising device inside the tower, work can be done inside the tower body, and the work site is small, making it possible to perform construction work and economically It is.

■ The entire steel tower is supported by a fixed frame elevating frame consisting of a box-shaped frame with strong supports at each corner.
The columns of the elevating pedestal are slidably formed on the columns of the fixed pedestal, and a jack for raising and lowering the elevating pedestal is provided for each column of the elevating pedestal, making it easy to synchronize the rise of the elevating pedestal on all four sides. Prevent sideways shaking of the top of the tower and vibration of the tower when ascending.

In particular, for example, when using an electric jack for ball screw jacking, the synchronization of the rise is ensured, fine adjustments are possible, and the load is held securely and safely, making the work easier. Moreover, it is extremely stable and highly safe.

Furthermore, when the elevating frame is stopped, it is temporarily fixed to the fixed frame, so it is safe.

(2) Since the raising work can be carried out at a relatively low place within the height range of the raising device, there is no need to work at heights, and there is no need to come close to live wires, which is extremely favorable in terms of worker safety.

■ Due to the effects of ■ and ■, it is possible, for example, to carry out work to raise the height of a steel tower with live overhead lines still in use, and other temporary work is not required, so for example, there is no power outage and the construction period can be shortened. This has the advantage of significantly reducing construction costs.

It should be noted that the ability to raise the height of a steel tower without power outage has previously been impossible without temporary construction in systems that are essential as a constant system, or systems that are frequently used during accidents, work, or for system balance. However, the advantage of eliminating the need for this temporary construction is significant.

(2) The structure or capacity of the fixed frame, elevating frame, and jack can be selected arbitrarily, so it is possible to increase the load, so it can be applied to large steel towers.

(2) It is possible to raise the height to any desired height by adding a lower structure below the elevating pedestal, and by appropriately repeating raising by jacking and temporarily fixing the fixed pedestal and the elevating pedestal.

Although the above-mentioned embodiments mainly describe the case of angle iron square steel towers, the present invention can be applied to pipe towers as well, and can also be applied to towers for other purposes other than power transmission towers, or when constructing towers. It is clear that the present invention can also be applied to the upper part of a steel tower that has been assembled in advance.

[Brief explanation of the drawing]

FIGS. 1A to 1E are configuration diagrams shown in the order of work steps to explain a construction method for raising a steel tower according to an embodiment of the present invention. FIG. 2 is a side view showing an embodiment of the height raising device of the present invention. Fig. 3 is a diagram showing an example of the structure of the sliding part of the column in the embodiment of the device of the present invention, in which Fig. A is a side view and loss is shown at A-A in Fig. A.
Figure A' is a cross-sectional view, and Figure A is a front view showing a roller attached to the support of the fixed frame in Figure A. 1...Existing steel tower, 2...Lower leg of new construction, 3...Lower end of leg, 4...Elevating device, 5...・Fixed frame, 6... Lifting frame, 7... Jacket, 8... Fixed frame foundation, 9, 12... Pillar, 10... ...Landing, 11...Leg, 13...Colo, 1
4... Connecting beam, 15... Leg support of steel tower 1, 16... Bolt hole, 17...
・Lower structure, 18...flange, 19...
...Connection point.

Claims (1)

[Scope of Claims] 1. A method for raising the height of a steel tower by adding the lower end legs of the steel tower, comprising: (a) an above-ground structure comprising a box-shaped frame body having at least three pillars at the corners on the inside of the steel tower; A fixed pedestal fixed to the pedestal, and above the fixed pedestal, at least three pillars are formed so as to be able to slide on the pillars of the fixed pedestal, respectively, and a connecting device for fixing and supporting the legs of the steel tower is provided on the upper part. an elevating pedestal of a predetermined height consisting of a box-like frame body, and a jack for raising and lowering the elevating pedestal on the outside or inside of the support of the elevating pedestal; (b) connecting and fixing the connector on the upper part of the elevating frame to the leg of the steel tower; (c) removing the lower end of the leg of the steel tower from the ground to connect the steel tower to the fixed frame and the elevating frame; (d) Raise the jack to raise all of the elevating gantry together with the steel tower by one stroke, and temporarily fix all of the elevating gantry to the fixed pedestal, or raise the elevating gantry by one stroke and temporarily fix it. After the operation, the upper end of the jack is lowered and reconnected to the lower part of the elevating pedestal, and the elevating trestle is raised by 1 loaf and the temporary fixing operation is performed by increasing the overlapping height of the elevating pedestal with respect to the fixed pedestal. (e) Each time there is no margin in the wrap allowance due to one or more operations of raising and temporarily fixing the elevating platform in (d) above, , the height of the elevating pedestal is increased one after another by sequentially adding lower structures including the pillars of a predetermined height below the elevating pedestal; (f) by the operations (d) and (e) above, A method for raising the height of a steel tower, which is characterized in that the lower end of the leg of the steel tower is connected to a pre-assembled new lower leg after the ground height reaches a predetermined height. 2. A fixed pedestal fixed to a base consisting of a box-shaped frame body with pillars at the corners, and pillars arranged above the fixed pedestal and configured to be slidable in the vertical direction on the outside of the pillars of the fixed pedestal, respectively. an elevating pedestal consisting of a box-shaped frame body having a box-like frame body and having a connecting beam on the upper surface for firmly supporting the legs of the steel tower; and an elevating pedestal arranged perpendicularly to the outside of each of the pillars at the corner of the picture pedestal;
a jack for raising and lowering the elevating frame, the upper end of which is connected to a connection part provided at a predetermined interval in the vertical direction of the support of the elevating frame, and the lower end of which is fixedly supported on the ground; The lower part is configured to add a lower structure including the pillars of a predetermined height, and the pillars of the fixed pedestal and the elevating pedestal are each provided with fixing devices for fixing them at every predetermined interval position between the picture pedestals. A steel tower raising device characterized in that the entire device is installed inside the steel tower. 3. The steel tower according to claim 2, wherein the corner posts of the fixed pedestal have rollers on the outside above the top thereof to ensure smooth sliding with the inside of the corner posts of the elevating pedestal. Raising device. 4. The steel tower raising device according to claim 2 or 3, wherein the jack is an electric jack.