Method for toppling a tower-like structure with an anchor ring as the axis of rotation

Abstract

To provide a safe overturning method of a tower-like structure which reduces the man-hour during overturning preparation and after execution of overturning, and which does not require a large external force at the start of overturning.SOLUTION: Even in the case where there is no structure which serves as an overturning axis such as a flange on a concrete foundation, an anchor ring existing above the ground is utilized, and the execution of overturning is achieved after going through a horizontal cutting step, a cut-out creation step and an installation step.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for toppling a tower-like structure such as a windmill for power generation. In the disassembly of the tower-like structure, an "anchor ring" that is embedded in a concrete foundation and located about 500 mm to 800 mm above the ground and firmly connected to the tower-like structure above it is used as a tipping axis to topple the tower-like structure for disassembly.

Background Art

[0002] Structure Although it is disassembled due to aging deterioration or equipment replacement, in the case of a so-called tower-like structure with a certain height, it is standard to install a scaffold and sequentially cut it into small pieces from the topmost part at a high place and lower it by a crane or the like until the lower part is reached, and finally remove the foundation part. Structure In order to reduce the high-altitude work in the above disassembly, improve the safety of workers, reduce man-hours, and achieve early disassembly, as techniques for toppling and disassembling tower-like structures, those disclosed in Patent Document 1 (method for toppling a regenerator of a hot blast stove) and Patent Document 2 (method for toppling a tower-like structure utilizing a foundation part) are known.

[0003] The technique disclosed in Patent Document 1 relates to a technique for realizing a safe toppling by reinforcing the base part of a structure by some method to secure a tipping axis and then controlling the tipping direction by notching the structure itself. The technique disclosed in Patent Document 2 is a technique that has evolved from the problems of the technique of Patent Document 1. By notching a concrete foundation, a strong tipping axis is formed to control the tipping direction and realize a safe tipping. The lowermost part of the tower-like structure and the concrete foundation are fixed with flanges and bolts, and it is a structure of a so-called "anchor bolt method". The notches in Patent Documents 1 and 2 are less than half the size of the bottom. Even if notched, the overall center of gravity is on the safer side than the tipping axis, and it is necessary to apply force from the outside at the start of tipping, resulting in a forced tipping. For example, Patent Document 2 describes a method of pushing up with a jack. ​

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, a tipping axis is created by reinforcing the base, and in Patent Document 2, a tipping axis is created by taking advantage of the strength of the concrete foundation. Finding a strong tipping axis in the tipping method is the most important issue.

[0006] According to Patent Document 1, it is a method for disassembling a "regenerator of a hot blast stove", which is a tower-shaped structure. By filling a filler in the lower part of the cylindrical regenerator, the strength of the lower part of the regenerator is increased, and when this part is notched to perform tipping, buckling due to insufficient strength is prevented, and by limiting the tipping direction, safe tipping is achieved.

[0007] However, the work of filling the filler takes a lot of man-hours, and waiting time occurs while the filler hardens. Also, at the final stage of disassembly, the filler becomes industrial waste.

[0008] According to Patent Document 2, without using "reinforcement of the cylindrical lower part" as in Patent Document 1, by taking advantage of the concrete foundation buried in stable ground, digging down to the concrete foundation, notching the concrete foundation to create a strong tipping axis, and limiting the tipping direction to achieve safe tipping. However, the work of digging down to the concrete base also takes a lot of man-hours.

[0009] In the present invention, an "anchor ring" embedded in a concrete foundation and located about 500 mm to 800 mm above the ground and firmly connected to the tower-like structure above it is utilized as a tipping axis. There are flanges with a thickness of 100 mm at the upper and lower parts of the anchor ring, and the upper and lower parts are bolted inside the tower. By tightening the nut It can be said that a strong plate is formed by its thickness and circular structure. The lower part of this anchor ring is notched in the tipping direction to create a notch larger than half of the bottom of the plate, and the overall center of gravity is on the tipping direction side of the tipping axis. "The resistance of the anchor ring" and "the resistance of the remaining bolts (although the bolts in the notch are removed)" After creating a state where the stationary state is maintained, while holding the bolts on the tipping axis, the remaining bolts are cut from the inside to the outside (or cut from the outside to the inside). At a certain point, the remaining bolts cannot withstand the tipping force and are torn off, causing natural tipping to topple the tower-like structure. Towards The purpose is to topple the tower-like structure.

Means for Solving the Problems

[0010] The invention according to claim 1 for achieving the above object includes a horizontal cutting step of cutting the lower part of the anchor ring horizontally to a position determined in advance by calculation and larger than half of the bottom in the horizontal direction, a notch creating step of cutting obliquely upward from the lower part of the anchor ring toward the central cross-section of the horizontal cutting, a mounting step of welding a steel material for protecting (preventing spreading) the tipping axis to the notch portion, and a tipping step of tipping the tower-like structure by the tipping axis on the anchor ring with the meeting line of the horizontal cutting step and the notch creating step as the tipping axis.

[0011] According to this configuration, there is no need to "fill with a filler and dispose of it later" as in Patent Document 1, nor is there a need for "the operation of digging down to a huge base buried in the ground" as in Patent Document 2. The tower-like structure can be easily, safely, and quickly toppled using a strong part, the anchor ring, which is a part of the tower-like structure, as the tipping axis.

[0012] In this toppling process, a strong part that is originally a part of the structure called the anchor ring is utilized as the strength of the toppling axis (toppling fulcrum), so it can resist buckling and topple the tower-shaped structure in the planned direction. Structure It is safe because it can topple the tower-shaped structure.

[0013] The invention according to claim 2 is characterized in that the overall center of gravity is moved to the toppling side of the toppling axis, and the bolts are sequentially cut from the state where it is stopped by the resistance of the anchor ring and the tension of the remaining bolts, and the natural toppling is caused without applying a large external force.

Effects of the Invention

[0014] According to the present invention, by horizontally cutting the lower part of the anchor ring, further making a notch and removing it obliquely upward from the lower part thereof, and toppling the tower-shaped structure with the meeting line of the horizontal cut and the oblique upward cut as the toppling axis, the tower-shaped structure can be easily toppled.

[0015] By making the notch larger than the radius of the tower and moving the overall center of gravity to the toppling side from the toppling axis, maintaining the stationary state by the resistance of the anchor ring and the tension of the remaining bolts, and cutting the bolts from that state, natural toppling can be carried out without requiring a large external force. Toppling can be carried out without the need for "unnecessary reinforcement" or "large-scale excavation of the ground" as in Patent Document 1 and Patent Document 2.

Brief Explanation of Drawings

[0016]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0017] Next, embodiments of the present invention will be described in detail with reference to the drawings. A method for toppling a tower-like structure to demolish it will be described with reference to FIGS. 1 to 5. FIG. 1 is a side view showing a tower-like structure according to an embodiment of the present invention, FIG. 2 is a view showing the anchoring of the method for toppling the tower-like structure, the cutting, notching, and toppling axis around it, and FIGS. 3 to 5 are views showing bolt cutting in the toppling process according to the present embodiment.

[0018] As shown in FIG. 1, in the present embodiment, the tower-like structure 10 is a wind turbine for power generation, but the tower-like structure of the present invention is not limited to a wind turbine for power generation. For example, even if it is not a single tower-like structure, a similar structure may be used for columns that support heavy objects.

[0019] What is described as "anchoring" is a general term for "a strong plate for joining the structure above it made above the concrete base", and the shape is not limited to FIG. 2.

[0020] The tower-like structure 10 is connected by an anchoring through the tower 12 and fixed to the foundation 13.

[0021] Next, each step of the method for toppling the tower-like structure of the present invention will be described. The method for toppling the tower-like structure of the present invention includes a horizontal cutting step, a notch creating step, an attachment step, and a toppling step.

[0022] [Horizontal cutting step] Next, while holding bolts under the anchoring, horizontal cutting is performed up to a distance 21 determined in advance by calculation. This distance is larger than the radius of the bottom. The cutting can be performed by, for example, fusion cutting, or a wire saw or the like may be used.

[0023] [Notch creating step] Next, cutting is performed obliquely upward from below the cutting surface toward the central cutting line 22 to create a notch. The cutting can be performed by fusion cutting, or a wire saw or the like may be used.

[0024] [Mounting process] Next, reinforce the notch formed in the notching process. The reinforcement can be achieved, for example, by welding a steel material (not shown in the figure) in the same direction as the tipping axis 22. This serves to prevent the tipping direction from deviating from the plan due to the opening of the cut during tipping.

[0025] [Tipping process] Next, in the tipping process, in the present invention, since the center of gravity is on the tipping side, as described above, a strong external force for tipping is not required. To hold the bolts 31 corresponding to the tipping axis (two on each side are held in the figure, but any number can be used depending on the situation) and prevent the tipping axis from shaking and maintain the strength, avoid the periphery of these bolts and cut horizontally from the inside to the outside (or from the outside to the inside) under the anchor ring to sequentially cut the remaining bolts (see Fig. 3). This can be performed remotely by a wire saw (not shown in the figure), enabling realization even if the operator is not in the immediate vicinity of the site immediately before tipping, which is also beneficial for ensuring the safety of the operator.

[0026] In the above embodiment, a wind turbine for power generation is exemplified as the tower-like structure, but it is not limited thereto, and any tower-like structure made by the anchor ring method may be used. Structure It can be any as long as it is such. Incidentally, the differences between the "anchor ring method", which is the method of binding the tower structure in the present invention, and the "anchor bolt method", in which the lowermost part of the tower structure is bound to the concrete foundation, are shown in [Figure 7] and [Figure 8] as schematic diagrams and photographs.

Explanation of reference numerals

[0027] 10 Tower-like structure 12 Tower 13 Base 20 Anchor ring 21 Distance determined by calculation 22 Central cutting line (= tipping axis) 23 Notch 31 Bolt 32 Wire saw (only the wire is shown in the figure)

Claims

1. A method of implementing toppling while utilizing the anchoring of a tower-like structure, comprising: a horizontal cutting step of cutting the lower side of the anchoring horizontally to a position determined in advance by calculation to be larger than half of the bottom part; a notch creating step of cutting obliquely upward from below the base flange of the anchoring toward the central side cross-section of the horizontal cutting; a mounting step of welding a support member for protecting the toppling axis to the notch portion; and a toppling step of toppling the tower-like structure by the toppling axis on the anchoring with the encounter line of the horizontal cutting step and the notch creating step as the toppling axis. The method of toppling a tower-like structure is characterized by creating a strong toppling axis by utilizing the anchoring and causing toppling.

2. The method of toppling a tower-like structure according to claim 1, characterized in that the overall center of gravity is moved to the toppling side of the toppling axis, and the bolts are sequentially cut from the stationary state by the resistance of the anchoring and the tension of the bolts connecting the upper and lower flanges that were not cut off in the notch forming step, and at a certain point, the remaining bolts cannot withstand the toppling force and are torn off, causing natural toppling without applying a large external force.

Images