Method for dismantling tower-like structures

Abstract

To provide a method for disassembling a towering structure which can more inexpensively and efficiently disassemble a towering structure.SOLUTION: A part in a circumferential direction is cut on a base side of a towering structure. A first cut part 17a is a part in the circumferential direction at a position opposite to a fall direction, and the first cut part 17b is a circumferential position perpendicular to the fall direction. Here, the first cut parts 17a and 17b desirably include a substantially horizontal cut part. A jack 27 and a jack receiving part 29b are arranged so as to stride over the first cut part 17a. A second cut part of a part in the circumferential direction is cut. The second cut parts 31a and 31b include a cut part inclined so that the cut position becomes lower from a side opposite to the fall direction toward the fall direction. The ends on the fall direction side of the second cut part 31b are not connected to each other, and a non-cut part 32 that is not cut remains in a part of the circumferential direction of the fall direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a method for dismantling a tower-like structure such as a tower for wind power generation. [Background technology]

[0002] Tower-like structures such as wind power generation towers are dismantled, for example, every 20 years, and new tower-like structures are constructed as necessary. When dismantling tower-like structures, a method has been proposed in which the tower-like structures are toppled to the ground (e.g., Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 55-7308 [Patent Document 2] JP 2019-210685 A Summary of the Invention [Problem to be solved by the invention]

[0004] 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 time for construction. For example, when the tower-like structure is to be overturned, all the weight is placed on the hinge, so a fairly large-scale hinge structure is required, and it is not easy to install the hinge structure or fix it to the tower-like structure.

[0005] Furthermore, in order to topple a tower-like structure while suspending it with a large crane and moving it, as in Patent Document 2, it is necessary to cure the ground around the tower-like structure within the range of movement of the large crane. Also, since the large crane is required until the toppling is completed, the period of use of the large crane is extended, which is a factor in increasing costs.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a method for dismantling a tower-like structure that enables dismantling a tower-like structure more cheaply and efficiently. [Means for solving the problem]

[0007] 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 in a direction at a predetermined angle to the overturning direction near the top of the tower-like structure, 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 side opposite 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 side opposite to the overturning direction so as to straddle the first cut portion. The method for dismantling a tower-like structure includes a step (c) of placing a cutting portion around the tower-like structure, a step (d) of cutting a second cutting portion which is a part of the circumference excluding the first cutting portion and a part of the non-cut portion on the side of the tipping direction, and a step (e) of extending the jack and pulling the tipping assistance wire to tip over the tower-like structure, wherein the first cutting portion includes a substantially horizontal cutting portion, and the second cutting portion includes a cutting portion which is inclined from the opposite side to the tipping direction toward the tipping direction so that the cutting position is lower.

[0008] In step c), an anti-tip device and an anti-tip pin may be installed so as to straddle the first cut portion, except for the outer surface opposite to the tipping direction, and the anti-tip pin may be removed before step e.

[0009] In step e, the jack and the anti-toppling pin may be operated by remote control.

[0010] The first cut portion may have a substantially horizontal cut portion at a circumferential position perpendicular to the direction of the fall, and the second cut portion may include a position connecting the first cut portion at a circumferential position on the opposite side of the direction of the fall and the first cut portion at a circumferential position perpendicular to the direction of the fall.

[0011] In step a, the tipping assist wire may be attached at 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 at the two locations approximately evenly.

[0012] The tower-like structure is a wind power generation tower, and prior to step a, a nacelle fixed to the top of the tower-like structure is removed, and in step a, the flange portion that fixed the nacelle is used to connect the tipping direction correction wire and the tipping assistance wire.

[0013] Prior to step e, a buckling prevention member may be fixed to a part of the inner surface side of the uncut portion.

[0014] After step e, the toppled tower-like structure may be cut into small pieces on the ground and dismantled.

[0015] 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 to the direction of tipping, so that the tower-like structure can be toppled without using conventional large cranes, hinge members, etc. Therefore, work can be performed regardless of the weather, and costs can be reduced.

[0016] In addition, since the first cutting section includes a cutting section in a substantially horizontal direction, the tower-like structure above the cutting section can be stably supported below the cutting section even after cutting. 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, the jack arranged on the opposite side of the tipping direction can be made smaller when tipping the tower-like structure around the non-cutting section as the center of rotation.

[0017] Furthermore, if the first cut portion has a substantially horizontal cut portion at each circumferential position perpendicular to the overturning direction, after cutting, the tower-like structure above the first cut portion can be more stably supported below the cut portion.

[0018] Furthermore, if the jack and anti-toppling pins can be operated remotely, workers do not need to work near the tower-like structure when tipping it, which is safer.

[0019] In addition, by attaching the tipping assist wire to two locations spaced apart in the width direction of the tower-shaped structure (direction perpendicular to the tipping direction), and using a pulley to pull the tipping assist wire attached to two locations, the tower-shaped structure can be pulled approximately evenly in the tipping direction, making it possible to control the tipping direction more stably.

[0020] In addition, when the tower-like structure is a wind power generation tower, the work can be made easier by removing the nacelle fixed to the top of the tower-like structure and connecting the tipping direction correction wire and the tipping assistance wire using the flange portion that fixed the nacelle.

[0021] In addition, before the tower-like structure is overturned, a buckling prevention member of a predetermined height can be fixed to a portion of the inner surface of the uncut portion, thereby preventing the tower-like structure from buckling before it overturns.

[0022] In addition, the tower-like structure that has been toppled to the ground can be cut into small pieces on the ground and dismantled, making dismantling work easy. Effect of the Invention

[0023] According to the present invention, a method for dismantling a tower-like structure can be provided, which enables a tower-like structure to be dismantled more cheaply and efficiently. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 shows a tower-like structure 1. [Diagram 2] 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-shaped structure 1. [Diagram 3] FIG. 2 is an enlarged view showing the vicinity of the upper end of the tower-like structure 1. [Figure 4] FIG. [Diagram 5] 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. [Figure 6] FIG. 2 is a diagram showing the vicinity of the base of the tower-like structure 1 where the jack 27 and the anti-tip device 25 are arranged. [Figure 7] 6A and 6B are diagrams showing the operation of the fall prevention device 25. [Figure 8] FIG. 4(a) is a diagram showing the vicinity of the base of the tower-like structure 1 provided with second cut portions 31a and 31b, and FIG. 4(b) is a diagram showing the circumferential positions of the second cut portions 31a and 31b. [Figure 9] FIG. 13 is a diagram showing a state in which the anti-slip member 24 is fixed. [Figure 10] FIG. 13 is a diagram showing a state in which the buckling prevention member 28 is fixed. [Figure 11] 1A and 1B are diagrams showing a state in which the tower-like structure 1 is being overturned. [Figure 12] FIG. 2 is a diagram showing the tower-like structure 1 in an overturned state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a diagram showing a tower-like structure 1. In this embodiment, the tower-like structure 1 is a wind power generation tower, but it may be another tower-like structure. For example, the present invention can be applied to a tower-like structure such as a chimney.

[0026] A tower-like structure 1 stands on the ground 7, and a nacelle 3 to which blades are attached via flange parts 5 is fixed to the upper part of the tower-like structure 1. The tower-like structure 1 is made of, for example, hollow steel.

[0027] 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. FIG. 2 shows the state in which the tipping direction correction wire 9 and the tipping assistance wire 11 are connected, with FIG. 2(a) being a view seen from the arrow B in FIG. 2(b) and FIG. 2(b) being a view seen from the arrow A in FIG. 2(a). Here, the direction of the arrow C in FIG. 2(a) is the tipping direction of the tower-like structure 1, and the direction of the arrow D in FIG. 2(a) is the opposite side to the tipping direction. Also, the directions E and F in FIG. 2(b) are perpendicular to the tipping direction.

[0028] 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 facing the tipping direction (direction C in the figure).

[0029] Fig. 3 is an enlarged view of the vicinity of the top of the tower-like structure 1, and Fig. 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.

[0030] 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, or the like 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.

[0031] 3, a pair of eye plates 15 are further disposed at positions shifted in the overturning direction (direction C) from each eye plate 15 to which the overturning direction correction wire 9 is connected, and the overturning assist wire 11 is connected to the eye plates 15. That is, the overturning assist wire 11 is attached at two points spaced apart in the width direction (directions E and F) of the tower-like structure 1.

[0032] 4 is a plan view of the tower-like structure 1. Both ends of the tipping assist wire 11 are attached to the flange portions 5. A pulley 13 is attached to approximately the center of the tipping assist wire 11. In a process of pulling the tipping assist wire 11, which will be described later, the use of the pulley 13 allows the tipping assist wire 11, which is attached at two locations spaced apart from each other in the width direction, to be pulled approximately evenly (in the direction C in the figure).

[0033] 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 step of pulling the tipping assist wire 11. Also, the pulley 13 may be installed before the step of pulling the tipping assist wire 11.

[0034] Next, a part of the tower-like structure in the circumferential direction is cut on the base side of the tower-like structure. Fig. 5(a) is a side view of the vicinity of the base of the tower-like structure 1, and Fig. 5(b) is a diagram showing the circumferential positions of first cut portions 17a and 17b in the cross section of the tower-like structure 1.

[0035] The first cut portion 17a is a part of the circumferential direction at a position on the opposite side to the falling direction (direction D in the figure), and the first cut portion 17b is 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, for example, gas cutting. The order of cutting the first cut portions 17a and 17b is not particularly limited, and for example, the first cut portion 17a may be cut after cutting the two first cut portions 17b.

[0036] Here, 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 present in a part of the first cutting portion 17a or the first cutting portion 17b. The first cutting portions 17b are disposed at 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 the term "substantially horizontal" refers to a range of, for example, about ±1° with respect to a completely horizontal state.

[0037] Furthermore, 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. Furthermore, 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 the pin holes 21 are formed using, for example, a magnetic drilling machine or the like.

[0038] In order to accurately determine the formation range of the first cut portions 17a, 17b, holes or slits may be formed at the start and end points of the cut range before the formation of the first cut portions 17a, 17b. Also, the fixing holes 19 and the pin holes 21 may be formed before the formation of the first cut portions 17a, 17b.

[0039] Next, as shown in FIG. 6, on the outer surface on the side opposite to the overturning direction (direction D in the figure), a base 29a is placed under the first cutting portion 17a, and a jack receiving portion 29b is placed over 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 overturning direction of the tower-like structure 1, and the jack 27 can extend and retract in the direction of the jack receiving portion 29b.

[0040] Furthermore, on the outer surface in the direction perpendicular to the tipping direction (directions E and F in the figure), a tipping prevention device 25 is fixed to the lower part of the first cut portion 17b as necessary. A tipping prevention pin 23 is disposed on the upper part of the tipping prevention device 25. That is, the tipping prevention device 25 and the tipping prevention pin 23 are disposed so as to straddle the first cut portion 17b (the cut portion excluding the first cut portion 17a on the outer surface opposite to the tipping direction).

[0041] FIG. 7 is a diagram showing the operation of the tip-over prevention device 25. As shown in FIG. 7(a), the tip-over prevention pin 23 is disposed at a position facing the pin hole 21. As shown in FIG. 7(b), when the tip-over prevention device 25 is operated, the tip-over prevention pin 23 is inserted into the pin hole 21 (in the direction of the arrow G in the figure). In this way, the top and bottom of the first cutting portion 17b are connected by the tip-over prevention device 25 and the tip-over prevention 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 tip-over prevention device 25 are, for example, hydraulic devices.

[0042] Next, a second cut portion is cut in a circumferential direction. Fig. 8(a) is a side view of the vicinity of the base of the tower-like structure 1, and Fig. 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.

[0043] The second cut portions 31a, 31b include positions that connect the first cut portion 17a at a circumferential position on the opposite side of the overturning direction to the first cut portion 17b at a circumferential position perpendicular to the overturning 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 overturning direction (direction C in the figure).

[0044] 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 linear, 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. That is, 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.

[0045] 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. In order to accurately determine the position of the end portion on the tipping direction side of the second cut portion 31b (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 on the tipping direction side of the second cut portion 31b.

[0046] Furthermore, when the second cut portions 31a and 31b are cut, the stress applied to the tower-like structure 1 is released after cutting, which may cause misalignment. Therefore, in order to prevent this misalignment, a slip-stop member 24 may be disposed. Figure 9 is a cross-sectional view showing the state in which the slip-stop member 24 is fixed.

[0047] In order 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 by the welded portion 34 only at one of the upper and lower parts of the second cut portion 31a (31b). For example, one of the inner and outer anti-slip members 24 is welded to the upper part of the second cut portion 31a (31b), and the other is welded to the lower part of the second cut portion 31a (31b). In this state, the entire second cut portion 31a (31b) other than the pre-cut portion is cut.

[0048] In addition, scallops 39 are formed on the inner surface of the anti-slip member 24 at positions corresponding to the second cut portions 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 manner, it is possible to suppress misalignment after cutting of the second cut portions 31a, 31b.

[0049] Also, buckling prevention members 28 may be fixed to a part of the inner surface side of non-cut portion 32. Fig. 10 is a cross-sectional view showing the state in which buckling prevention members 28 are fixed. Buckling prevention members 28 are, for example, H-shaped steel, and are respectively placed above and below the position of the end portion on the tipping direction side of second cut portion 31b (provisional tipping axis 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.

[0050] The buckling prevention member 28 arranged below the planned tipping axis portion 35 protrudes slightly above the planned tipping axis portion 35 and is fixed to the inner surface of the tower-like structure 1 below the planned tipping axis portion 35 by the welded portion 33. In other words, the buckling prevention member 28 arranged below the planned tipping axis portion 35 is not fixed above the planned tipping axis portion 35. On the other hand, the buckling prevention member 28 arranged below the planned tipping axis portion 35 is substantially entirely fixed to the inner surface of the tower-like structure 1 by the welded portion 33.

[0051] The buckling prevention member 28 may be fixed after the second cut portions 31a, 31b are formed, or may be fixed before that. For example, the buckling prevention member 28 may be fixed before the first cut portions 17a, 17b are formed, or may be fixed 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 later.

[0052] Next, the tower-like structure 1 is overturned. Fig. 11(a) is a side view of the tower-like structure 1, and Fig. 11(b) is an enlarged view of the vicinity of the base. To overturn the tower-like structure 1, first, the overturning prevention pin 23 is removed from the pin hole 21 as shown in Fig. 7(a).

[0053] 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) to tip the tower-like structure 1. Here, the jack 27 and the 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 the jack receiving part 29b, and the tower-like structure 1 can be tilted in the tipping direction.

[0054] 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 tower-like structure 1 to tip, a special large crane or the like is not required to pull the tipping assist wire 11. As described above, the use of the pulley 13 allows the tipping assist wire 11 to be pulled approximately evenly in the width direction. This allows the tower-like structure 1 to tip reliably in the tipping direction. In addition, the tipping direction correction wire 9 can prevent the tower-like structure 1 from tipping in a direction different from the tipping direction.

[0055] FIG. 12 is a diagram showing a state in which the tower-like structure 1 has been overturned. 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 predetermined 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 to the opposite side to the overturning direction when it falls.

[0056] 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 portions 17a, 17b, which include approximately horizontal portions. Therefore, even if a portion of the circumference is cut, the tower-like structure 1 can be stabilized and unexpected tipping over of the tower-like structure 1 can be prevented.

[0057] Furthermore, by using the anti-toppling pin 23, it is possible to prevent the tower-like structure 1 from shifting at the first cut portion 17b.

[0058] In addition, by forming the second cut parts 31a and 31b obliquely downward toward the falling direction, the size of the jack 27 can be reduced when the tower-like structure 1 is overturned by the jack 27. For example, if the center of rotation (position of the non-cut part 32) of the tower-like structure 1 when overturned is at the same height as the first cut part 17a, the tower-like structure 1 cannot be tilted beyond a predetermined level unless the operating pressure of the jack 27 is increased and the stroke length is lengthened. In contrast, by positioning the first cut part 17a higher than the center of rotation (position of the non-cut part 32) of the tower-like structure 1 when overturned, the tower-like structure 1 can be overturned at a larger rotation angle with a smaller force and a shorter stroke length.

[0059] Furthermore, by arranging the anti-slip members 24 at the second cut portions 31a and 31b, it is possible to suppress misalignment of the tower-like structure 1 after the second cut portions 31a and 31b are formed.

[0060] In addition, the operation of the jack 27 and the anti-toppling pin 23 can be controlled remotely, allowing work to be carried out more safely.

[0061] Furthermore, by providing the buckling prevention member 28, buckling of the uncut portion 32 can be suppressed.

[0062] In addition, when pulling the tipping assistance wire 11, a pulley is used to pull approximately evenly at two points spaced apart in the width direction of the tower-like structure 1, thereby suppressing rotation and shifts in the tipping direction when the tower-like structure 1 tips over.

[0063] 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-described embodiment. It is clear that a person skilled in the art can think of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

[0064] For example, the tower-like structure 1 does not have to be made of hollow steel, and may be made of reinforced concrete. When dismantling the tower-like structure 1, a large crane or the like is used to first 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 attached. In this case, the tipping direction correcting wire 9 and tipping assist wire 11 can be attached by utilizing the sling parts used during assembly. [Explanation of symbols]

[0065] 1……Tower-like structure 3. Nacelle 5....Flange section 7……ground 9……Falling direction correction wire 11... Falling support wire 13... Pulley 15………Eye plate 17a, 17b……First cutting part 19……Fixing hole 21………Pin hole 23... Anti-tip pin 24: Anti-slip member 25... Anti-tip device 27………Jack 28... Buckling prevention member 29a………Pedestal 29b………Jack support part 31a, 31b……Second cutting section 32……Uncut part 33, 34… Welded section 35....Tipping axis planned section 39………Scalloped

Claims

1. 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.

2. 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.

3. 3. The method for dismantling a tower-like structure according to claim 2, wherein in the step (e), the operation of the jack and the anti-toppling pins is performed by remote control.

4. 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.

5. 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.

6. 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.

7. 7. The method for dismantling a tower-like structure according to claim 1, further comprising the step of: fixing a buckling prevention member to a part of the inner surface side of the non-cut portion prior to the step e.

8. 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.

Images