JP7618142B2 - Method for dismantling tower-like structures - Google Patents

Description

The present invention relates to a method for dismantling tower-like structures such as wind power towers.

Tower-like structures such as wind power towers are dismantled after about 20 years, for example, and new tower-like structures are constructed as needed. When dismantling tower-like structures, a method has been proposed in which the tower-like structure is toppled to the ground (e.g., Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 55-7308 JP 2019-210685 A

However, the method of forming a hinge structure for rotation near the base of a tower-like structure, as in Patent Document 1, requires cost and construction time. For example, when tipping over a tower-like structure, all of the weight is placed on the hinge, so a fairly large hinge structure is required, and it is not easy to install the hinge structure or to secure it to the tower-like structure.

In addition, as in Patent Document 2, in order to topple a tower-like structure while suspending it with a large crane and moving it, it is necessary to cure the ground around the tower-like structure in the area where the large crane can move. In addition, since the large crane is required until the toppling is complete, the large crane is used for a longer period of time, which is a factor in increasing costs.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a method for dismantling tower-like structures that can dismantle tower-like structures more cheaply and efficiently.

In order to achieve the above-mentioned object, the present invention provides a method for dismantling a tower-like structure, comprising the steps of: (a) installing a pair of overturning direction correction wires near the top of the tower-like structure in a direction at a predetermined angle to the overturning direction, and installing an overturning auxiliary wire in the overturning direction; (b) cutting a first cut portion including a part of the circumferential direction on the opposite side to the overturning direction on the base side of the tower-like structure; and (c) placing a jack and a receiving part of the jack on the outer surface on the opposite side to the overturning direction so as to straddle the first cut portion. This method for dismantling a tower-like structure includes a step c of placing the cutting section, a step d of cutting a second cutting section, which is a part of the circumference excluding the first cutting section and a part of the uncut section on the tipping direction side, and a step e of extending the jack and pulling the tipping assistance wire to tip the tower-like structure, wherein the first cutting section includes a substantially horizontal cutting section, and the second cutting section includes a cutting section that is inclined from the opposite side of the tipping direction toward the tipping direction so that the cutting position is lower.

In step c, a tip-prevention device and a tip-prevention pin may be installed to straddle the first cut portion, except for the outer surface opposite the tip-over direction, and the tip-prevention pin may be removed before step e.

In step e, the jack and the anti-tip pin may be operated remotely.

The first cut portion may have a substantially horizontal cut portion at a circumferential position perpendicular to the tipping direction, and the second cut portion may include a position that connects the first cut portion at a circumferential position on the opposite side of the tipping direction to the first cut portion at a circumferential position perpendicular to the tipping direction.

In step a, the tipping assist wire is attached to two locations spaced apart in the width direction of the tower-like structure, and in step e, when pulling the tipping assist wire, a pulley may be used to pull the tipping assist wire attached to the two locations approximately evenly.

The tower-like structure may be a wind power tower, and prior to step a, a nacelle fixed to the top of the tower-like structure may be removed, and in step a, the flange portion that fixed the nacelle may be used to connect the tipping direction correction wire and the tipping assistance wire.

Prior to step e, a buckling prevention member may be fixed to a portion of the inner surface of the uncut portion.

After step e, the toppled tower-like structure may be cut into small pieces on the ground and dismantled.

According to the present invention, a non-cutting portion is provided in the direction of tipping, and the tower-like structure is toppled using a jack from the side opposite the tipping direction, so the tower-like structure can be toppled without using conventional large cranes, hinge members, etc. This means that work can be done regardless of the weather, and costs can also be reduced.

In addition, since the first cutting section includes a cutting section that is approximately horizontal, even after cutting, the tower-like structure above the cutting section can be stably supported below the cutting section. In addition, since the second cutting section has a cutting section that is inclined from the opposite side of the tipping direction toward the tipping direction so that the cutting position is lower, when tipping the tower-like structure around the non-cutting section as the center of rotation, the jack placed on the opposite side of the tipping direction can be made smaller.

In addition, if the first cut portion has a substantially horizontal cut portion at each circumferential position perpendicular to the overturning direction, the tower-like structure above the first cut portion can be supported below the cut portion more stably after cutting.

In addition, if the jack and anti-tip pins can be operated remotely, workers do not need to work near the tower-like structure when tipping it, which is safer.

In addition, the tipping assist wire is attached to two locations spaced apart in the width direction of the tower-like structure (direction perpendicular to the tipping direction), and when pulling the tipping assist wire, a pulley is used to pull the tipping assist wire attached to two locations, which allows the tower-like structure to be pulled approximately evenly in the tipping direction, making it possible to control the tipping direction more stably.

In addition, when the tower-like structure is a wind power tower, the work can be easily performed by removing the nacelle fixed to the top of the tower-like structure and connecting the tipping direction correction wire and tipping assistance wire using the flange part that fixed the nacelle.

In addition, before the tower-like structure is toppled, a buckling prevention member of a predetermined height can be fixed to a portion of the inner surface of the uncut portion to prevent the tower-like structure from buckling before toppling.

In addition, the tower-like structure can be toppled to the ground, cut into small pieces and dismantled on the ground, making dismantling work easier.

The present invention provides a method for dismantling tower-like structures that allows for more efficient and cheaper dismantling of tower-like structures.

FIG. 1A and 1B are diagrams showing the state in which a tipping direction correction wire 9 and a tipping assistance wire 11 are connected to a tower-like structure 1. FIG. 2 is an enlarged view showing the vicinity of the upper end of the tower-like structure 1. FIG. 1A is a diagram showing the vicinity of the base of a tower-like structure 1 provided with first cut portions 17a and 17b, and FIG. 1B is a diagram showing the circumferential positions of the first cut portions 17a and 17b. A diagram showing the vicinity of the base of the tower-like structure 1 where the jack 27 and anti-tip device 25 are arranged. 4A and 4B are diagrams showing the operation of the fall prevention device 25. 1A is a diagram showing the vicinity of the base of a tower-like structure 1 provided with second cutting portions 31a and 31b, and FIG. 1B is a diagram showing the circumferential positions of the second cutting portions 31a and 31b. FIG. 13 is a diagram showing a state in which the anti-slip member 24 is fixed. FIG. 13 is a diagram showing the state in which the buckling prevention member 28 is fixed. 4A and 4B are diagrams showing a state in which the tower-like structure 1 is being overturned. FIG. 2 is a diagram showing the tower-like structure 1 in an overturned state.

The following describes in detail an embodiment of the present invention with reference to the drawings. FIG. 1 is a diagram showing a tower-like structure 1. Note that in this embodiment, the tower-like structure 1 is described as a wind power generation tower, but it may be other tower-like structures. For example, it can also be applied to tower-like structures such as chimneys.

The tower-like structure 1 stands on the ground 7, and a nacelle 3 with blades attached via a flange portion 5 is fixed to the top of the tower-like structure 1. The tower-like structure 1 is made of, for example, hollow steel.

To dismantle the tower-like structure 1, first, a large crane or the like is used to remove the nacelle 3 and blades fixed to the top of the tower-like structure 1. Figure 2 shows the state in which the tipping direction correction wire 9 and tipping assistance wire 11 are connected, with Figure 2(a) being a view seen from the arrow B in Figure 2(b) and Figure 2(b) being a view seen from the arrow A in Figure 2(a). Here, the direction of arrow C in Figure 2(a) is the tipping direction of the tower-like structure 1, and the direction of arrow D in Figure 2(a) is the opposite side to the tipping direction. Also, the directions E and F in Figure 2(b) are perpendicular to the tipping direction.

As shown in the figure, a pair of tipping direction correction wires 9 are installed near the top of the tower-like structure 1 in opposing directions (directions E and F in the figure) that are approximately perpendicular to the tipping direction, and a tipping assistance wire 11 is installed in the tipping direction (direction C in the figure).

Figure 3 is an enlarged view of the vicinity of the top of the tower-like structure 1, and Figure 4 is a plan view of the tower-like structure 1. Eye plates 15 are welded to the flange portion 5. A tipping direction correction wire 9 and a tipping assistance wire 11 are connected to each eye plate 15 via a shackle or the like.

More specifically, a pair of eye plates 15 are arranged to face each other in a direction (E, F direction) perpendicular to the falling direction (C direction). One end of the fall direction correction wire 9 is connected to each of the eye plates 15 arranged to face each other in a direction (E, F direction) perpendicular to the falling direction. The fall direction correction wire 9 is fixed at the other end to the ground 7 by a weight, anchor, etc. while maintaining a predetermined tension. For example, as shown in FIG. 2(b), the angle between the ground 7 and the fall direction correction wire 9 is set to about 45°. Note that the fall direction correction wire 9 does not have to be completely perpendicular to the falling direction (C direction), and may be arranged approximately symmetrically at a predetermined angle.

As shown in FIG. 3, a pair of eye plates 15 are further arranged at positions offset in the falling direction (direction C) from each eye plate 15 to which the falling direction correction wire 9 is connected, and a falling assist wire 11 is connected to the eye plates 15. In other words, the falling assist wire 11 is attached at two locations spaced apart in the width direction (directions E and F) of the tower-like structure 1.

Figure 4 is a plan view of the tower-like structure 1. The tipping assist wire 11 has both ends attached to the flange portion 5. A pulley 13 is attached to approximately the center of the tipping assist wire 11. In the process of pulling the tipping assist wire 11 described below, the pulley 13 is used to pull the tipping assist wire 11, which is attached at two points spaced apart from each other in the width direction, approximately evenly (direction C in the figure).

In this way, by using the flange portion 5 that fixed the nacelle 3, the tipping direction correction wire 9 and the tipping assist wire 11 can be connected near the top of the tower-like structure 1. Note that the tipping assist wire 11 is loosened before the process of pulling the tipping assist wire 11. Also, the pulley 13 can be installed before the process of pulling the tipping assist wire 11.

Next, a portion of the tower-like structure is cut in the circumferential direction on the base side. Figure 5(a) is a side view of the tower-like structure 1 near the base, and Figure 5(b) is a diagram showing the circumferential positions of the first cut portions 17a and 17b in the cross section of the tower-like structure 1.

The first cut portion 17a is a part of the circumferential direction at a position opposite to the falling direction (direction D in the figure), and the first cut portion 17b is at a circumferential position perpendicular to the falling direction (directions E and F in the figure). If the tower-like structure 1 is made of steel, each part can be cut by gas cutting, for example. The order in which the first cut portions 17a and 17b are cut is not particularly limited, but for example, the first cut portion 17a may be cut after the two first cut portions 17b are cut.

It is desirable that the first cutting portions 17a and 17b include a cutting portion in a substantially horizontal direction, but for example, a non-horizontal portion may be included in a portion of the first cutting portion 17a or the first cutting portion 17b. The first cutting portions 17b are arranged in opposing positions across the center of gravity (center of the circle) of the tower-like structure 1 in the width direction (E, F direction) of the tower-like structure 1. Therefore, by making the first cutting portion 17b a substantially horizontal cutting portion, the load of the tower-like structure 1 above the cutting portion can be stably received. Note that substantially horizontal is within a range of, for example, about ±1° with respect to a completely horizontal state.

In addition, a plurality of fixing holes 19 are formed above and below the first cut portion 17a so as to straddle the first cut portion 17a. In addition, fixing holes 19 are formed below the first cut portion 17b, and pin holes 21 are formed above the first cut portion 17b. The fixing holes 19 and pin holes 21 are formed using, for example, a magnetic drill press.

In order to accurately determine the formation range of the first cut portions 17a and 17b, holes or slits may be formed at the start and end points of the cut range before the first cut portions 17a and 17b are formed. Also, the fixing holes 19 and the pin holes 21 may be formed before the first cut portions 17a and 17b are formed.

Next, as shown in FIG. 6, on the outer surface on the side opposite to the tipping direction (direction D in the figure), a base 29a is placed on the bottom of the first cutting portion 17a, and a jack receiving portion 29b is placed on the top of the first cutting portion 17a. The base 29a and the jack receiving portion 29b are fixed to the tower-like structure 1 by the fixing holes 19 (FIG. 5(a)). A jack 27 is connected to the base 29a. That is, the jack 27 and the jack receiving portion 29b are placed so as to straddle the first cutting portion 17a. The jack 27 can rotate relative to the base 29a in the tipping direction of the tower-like structure 1, and the jack 27 can extend and retract in the direction of the jack receiving portion 29b.

In addition, on the outer surface in a direction perpendicular to the tipping direction (directions E and F in the figure), a tipping prevention device 25 is fixed to the bottom of the first cut portion 17b as necessary. A tipping prevention pin 23 is placed on the top of the tipping prevention device 25. In other words, the tipping prevention device 25 and the tipping prevention pin 23 are placed so as to straddle the first cut portion 17b (the cut portion excluding the first cut portion 17a on the outer surface opposite the tipping direction).

Figure 7 is a diagram showing the operation of the anti-tip device 25. As shown in Figure 7(a), the anti-tip pin 23 is positioned opposite the pin hole 21. As shown in Figure 7(b), when the anti-tip device 25 is operated, the anti-tip pin 23 is inserted into the pin hole 21 (in the direction of arrow G in the figure). In this way, the top and bottom of the first cutting portion 17b are connected by the anti-tip device 25 and the anti-tip pin 23. Therefore, the upper part of the first cutting portion 17b does not shift, for example, in the tipping direction relative to the lower part of the first cutting portion 17b. The jack 27 and the anti-tip device 25 are, for example, hydraulic devices.

Next, a second cut portion is cut in the circumferential direction. Figure 8(a) is a side view of the tower-like structure 1 near the base, and Figure 8(b) is a diagram showing the circumferential positions of the second cut portions 31a and 31b in the cross section of the tower-like structure 1.

The second cut portions 31a and 31b include positions that connect the first cut portion 17a at a circumferential position on the opposite side of the falling direction to the first cut portion 17b at a circumferential position perpendicular to the falling direction. More specifically, the second cut portion 31a is formed to connect the first cut portion 17a and the first cut portion 17b, and the second cut portion 31b is formed in a predetermined range from the first cut portion 17b toward the falling direction (direction C in the figure).

The second cut portions 31a and 31b include cut portions that are inclined so that the cut position becomes lower from the opposite side of the falling direction (direction D) toward the falling direction (direction C). The inclination angle of the second cut portions 31a and 31b with respect to the horizontal direction is preferably, for example, 45 degrees or more, and more preferably 60 to 70 degrees. The second cut portions 31a and 31b do not necessarily have to be straight, but may be curved. The ends of the second cut portions 31b on the falling direction side are not connected to each other, and an uncut portion 32 that is not cut remains in a part of the circumferential direction of the falling direction. In other words, the second cut portions 31a and 31b are a part of the circumferential direction excluding the first cut portions 17a and 17b and a part of the uncut portion 32 on the falling direction side.

For example, in the case of a tower-like structure with a circumference of about 9 m, the first cut portion 17a can be about 1.5 m, the first cut portion 17b can be about 1 m each, the second cut portions 31a and 31b can be about 1 m each, and the non-cut portion 32 can be about 1.5 m. Also, in order to accurately determine the position of the end portion of the second cut portion 31b on the side in the direction of tipping (i.e., to accurately determine the length of the non-cut portion 32), a hole or slit may be formed in advance at the position of the end portion of the second cut portion 31b on the side in the direction of tipping.

In addition, when the second cut sections 31a and 31b are cut, the stress applied to the tower-like structure 1 is released after cutting, which may cause misalignment. Therefore, a slip-stop member 24 may be placed to prevent this misalignment. Figure 9 is a cross-sectional view showing the state in which the slip-stop member 24 is fixed.

To fix the anti-slip member 24, first, a part of the second cut portion 31a (31b) at the position where the anti-slip member 24 is to be fixed is pre-cut, and the anti-slip member 24 is fixed to the inner and outer surfaces of the tower-like structure 1 at the pre-cut portion. At this time, the anti-slip member 24 is arranged so as to straddle the second cut portion 31a (31b), and is fixed to the tower-like structure 1 only at one side above or below the second cut portion 31a (31b) by the welded portion 34. For example, one side of the inner and outer anti-slip members 24 is welded above the second cut portion 31a (31b), and the other side is welded below the second cut portion 31a (31b). In this state, the entire second cut portion 31a (31b) other than the pre-cut portion is cut.

In addition, a scallop 39 is formed on the inner surface of the anti-slip member 24 at a position corresponding to the second cut portion 31a (31b). This makes it possible to prevent the anti-slip member 24 from interfering with the unevenness formed during the preliminary cutting. By arranging the anti-slip member 24 in this way, it is possible to suppress misalignment after cutting the second cut portions 31a, 31b.

Buckling prevention members 28 may also be fixed to a portion of the inner surface of the non-cut portion 32. Figure 10 is a cross-sectional view showing the state in which the buckling prevention members 28 are fixed. The buckling prevention members 28 are, for example, H-shaped steel, and are placed above and below the end position on the tipping direction side of the second cut portion 31b (the tipping axis planned portion 35 that becomes the rotation axis when tipping). Note that the upper and lower buckling prevention members 28 are not joined to each other, but are butted against each other.

The buckling prevention member 28 arranged below the tipping axis planned portion 35 protrudes slightly above the tipping axis planned portion 35 and is fixed to the inner surface of the tower-like structure 1 below the tipping axis planned portion 35 by the welded portion 33. In other words, the buckling prevention member 28 arranged below the tipping axis planned portion 35 is not fixed above the tipping axis planned portion 35. On the other hand, the buckling prevention member 28 arranged below the tipping axis planned portion 35 is almost entirely fixed to the inner surface of the tower-like structure 1 by the welded portion 33.

The buckling prevention member 28 may be fixed after the second cut portions 31a, 31b are formed, but it may also be fixed in advance before that. For example, the buckling prevention member 28 may be fixed before the first cut portions 17a, 17b are formed, or between the first cut portions 17a, 17b and the second cut portions 31a, 31b. In other words, the buckling prevention member 28 may be fixed at any time before the toppling process of the tower-like structure 1 described below.

Next, the tower-like structure 1 is overturned. Figure 11(a) is a side view of the tower-like structure 1, and Figure 11(b) is an enlarged view of the vicinity of the base. To overturn the tower-like structure 1, first, remove the anti-overturn pin 23 from the pin hole 21 as shown in Figure 7(a).

Next, as shown in FIG. 11(b), the jack 27 is extended (arrow I in the figure), and as shown in FIG. 11(a), the tipping assistance wire 11 is pulled (arrow H in the figure), causing the tower-like structure 1 to tip. Here, the jack 27 and tipping prevention pin 23 are operated remotely from a distance where the operation can be visually confirmed. By extending the jack 27, the jack 27 presses against the jack receiving portion 29b, and the tower-like structure 1 can be tilted in the tipping direction.

The tipping assist wire 11 is pulled by heavy machinery such as a backhoe placed at a position beyond the tipping range of the tower-like structure 1. Since it is only necessary to trigger the tipping of the tower-like structure 1, a special large crane or the like is not required to pull the tipping assist wire 11. As mentioned above, the use of the pulley 13 allows the tipping assist wire 11 to be pulled approximately evenly in the width direction. This ensures that the tower-like structure 1 can be tipped in the tipping direction. The tipping direction correction wire 9 also prevents the tower-like structure 1 from tipping in a direction different from the tipping direction.

Figure 12 shows the tower-like structure 1 in an overturned state. In this state, the tower-like structure 1 can be dismantled by cutting it into small pieces on the ground. The tower-like structure 1 can be dismantled by manual gas cutting or by cutting it using heavy machinery. The overturning direction correction wire 9 can prevent the tower-like structure 1 from jumping out in the overturning direction by a certain amount or more even if the tower-like structure 1 breaks. In addition, the second cutting parts 31a and 31b are formed so as to gradually become lower in the overturning direction, so that the tower-like structure 1 does not shift in the opposite direction to the overturning direction when it falls.

As described above, according to the method for dismantling the tower-like structure 1 of this embodiment, the load of the tower-like structure 1 can be supported by the first cutting sections 17a and 17b, which include the approximately horizontal sections. Therefore, even if a portion of the circumference is cut, the tower-like structure 1 can be stabilized and the unexpected tipping over of the tower-like structure 1 can be prevented.

In addition, by using the anti-tip pin 23, it is possible to prevent the tower-like structure 1 from shifting at the first cutting section 17b.

In addition, by forming the second cut portions 31a and 31b diagonally downward toward the tipping direction, the size of the jack 27 can be reduced when tipping the tower-like structure 1 with the jack 27. For example, if the center of rotation (position of the non-cut portion 32) of the tower-like structure 1 when tipping is the same height as the first cut portion 17a, the tower-like structure 1 cannot be tilted beyond a certain level unless the operating pressure of the jack 27 is increased and the stroke length is lengthened. In contrast, by positioning the first cut portion 17a higher than the center of rotation (position of the non-cut portion 32) of the tower-like structure 1 when tipping, the tower-like structure 1 can be tipped at a larger rotation angle with less force and a shorter stroke length.

In addition, by placing anti-slip members 24 on the second cut sections 31a and 31b, it is possible to suppress misalignment of the tower-like structure 1 after the second cut sections 31a and 31b are formed.

In addition, the operation of the jack 27 and anti-tip pin 23 can be controlled remotely, making work safer.

In addition, by providing a buckling prevention member 28, buckling of the non-cut portion 32 can be suppressed.

In addition, when pulling the tipping assistance wire 11, a pulley is used to pull the tower-like structure 1 at two points spaced apart in the width direction approximately evenly, thereby preventing rotation and deviation in the tipping direction when the tower-like structure 1 tips over.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the above-mentioned embodiment. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

For example, the tower-like structure 1 does not have to be made of hollow steel, but may be made of reinforced concrete. When dismantling the tower-like structure 1, a large crane or the like was first used to remove the nacelle and blades fixed to the top of the tower-like structure 1, but it may be allowed to tip over with the nacelle and blades still attached. In this case, the tipping direction correction wire 9 and tipping assistance wire 11 can be attached using the sling part used during assembly.

REFERENCE SIGNS LIST 1 Tower-like structure 3 Nacelle 5 Flange portion 7 Ground 9 Wire for correcting tipping direction 11 Tip-over assistance wire 13 Pulley 15 Eye plate 17a, 17b First cut portion 19 Fixing hole 21 Pin hole 23 Tip-over prevention pin 24 Anti-slip member 25 Tip-over prevention device 27 Jack 28 Buckling prevention member 29a Base 29b Jack support portion 31a, 31b Second cut portion 32 Non-cut portion 33, 34 Welded portion 35 Preliminary tip-over axis portion 39 Scallop

Claims (8)

A method for dismantling a tower-like structure, comprising the steps of:
A step a of installing a pair of overturning direction correction wires in a direction at a predetermined angle with respect to the overturning direction near the top of the tower-like structure and installing an overturning assistance wire in the overturning direction;
A step b of cutting a first cut portion including a part of a circumferential direction on a side opposite to a tipping direction on a base side of the tower-like structure;
A step c of arranging a jack and a receiving portion of the jack on an outer surface opposite to the falling direction so as to straddle the first cut portion;
a step d of cutting a second cut portion which is a part in the circumferential direction excluding the first cut portion and a part of a non-cut portion on the falling direction side;
A step e of extending the jack and pulling the tipping assist wire to tip the tower-like structure;
Equipped with
A method for dismantling a tower-like structure, characterized in that the first cutting portion includes a substantially horizontal cutting portion, and the second cutting portion includes a cutting portion that is inclined from the opposite side of the falling direction toward the falling direction so that the cutting position is lower. In the step c, a tip-over prevention device and a tip-over prevention pin are installed so as to straddle the first cut portion, except for the outer surface on the side opposite to the tip-over direction;
2. The method for dismantling a tower-like structure according to claim 1, further comprising the step of removing the anti-toppling pins prior to step e. The method for dismantling a tower-like structure according to claim 2, characterized in that in step e, the operation of the jack and the anti-tip pin is performed by remote control. The first cut portion has a substantially horizontal cut portion at a circumferential position perpendicular to the overturning direction,
A method for dismantling a tower-like structure as described in any one of claims 1 to 3, characterized in that the second cutting portion includes a position that connects the first cutting portion at a circumferential position opposite the falling direction and the first cutting portion at a circumferential position perpendicular to the falling direction. In the step (a), the tipping assist wire is attached to two locations spaced apart in the width direction of the tower-like structure,
A method for dismantling a tower-like structure as described in any one of claims 1 to 4, characterized in that in step e, when pulling the tipping assist wire, a pulley is used to pull the tipping assist wire attached at two points approximately evenly. The tower-like structure is a wind power tower,
Before the step a, a nacelle fixed to the top of the tower-like structure is removed;
The method for dismantling a tower-like structure according to any one of claims 1 to 5, characterized in that in the step (a), the tipping direction correction wire and the tipping assistance wire are connected using a flange portion that fixed the nacelle. The method for dismantling a tower-like structure according to any one of claims 1 to 6, characterized in that a buckling prevention member is fixed to a part of the inner surface side of the uncut portion before step e. 8. The method for dismantling a tower-like structure according to claim 1, further comprising the step of cutting the overturned tower-like structure into small pieces on the ground and dismantling the same after step e.

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