JP7058566B2 - How to dismantle a tubular structure - Google Patents

Description

The present invention relates to a method for dismantling a tubular structure such as a chimney.

As a technique for dismantling a tubular structure such as a chimney, a technique for dismantling the tubular structure using a work scaffold that is detachably attached to a band that comes into surface contact with the outer peripheral surface of the tubular structure is known. (See, for example, Patent Document 1).

Further, there is known a technique of using a chimney dismantling scaffold having a work floor around the chimney, hitting the chimney with a concrete breaker or the like, and dropping a concrete block piece into the chimney to dismantle it (for example). , See Patent Document 2.).

Japanese Unexamined Patent Publication No. 2000-170376 Japanese Unexamined Patent Publication No. 2017-31681

However, if scaffolding is provided on the outer periphery of the chimney and concrete is hung, noise, dust, falling objects, and the like are likely to affect the surrounding environment. In addition, work becomes difficult in the event of a typhoon, strong wind, or gust.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the influence on the surrounding environment and to improve workability and safety.

To achieve the above objectives
The present invention
It is a method of dismantling a tubular structure.
The scaffolding process of providing a scaffold on the inner peripheral side of the tubular structure and
The cutting process of cutting the upper part of the tubular structure into round slices from the inner peripheral side,
The cutting part descent process of lifting the cut part of the tubular structure and lowering it to the ground,
The scaffolding descent process of lowering the upper part of the scaffolding to the ground,
It is characterized by having.

As a result, the chimney cutting work can be performed inside the chimney, so that the influence on the surrounding environment can be minimized and the workability and safety can be easily improved.

According to the present invention, it is possible to easily suppress the influence on the surrounding environment and improve workability and safety.

It is a vertical sectional view which shows the state which the scaffolding is provided in the chimney. It is a front view which shows the structure of a scaffold. It is a top view which shows the structure of a scaffold. It is a vertical sectional view which shows the process of core boring. It is a vertical sectional view which shows the process of attaching a wire of a wire saw. It is a vertical cross-sectional view which shows the process of lifting the upper and lower scaffolding assembly of the uppermost part. It is a top view which shows the 1st cutting process by a wire saw. It is a top view which shows the 2nd cutting process by a wire saw. It is a vertical sectional view which shows the process of hoisting a cut part of a chimney.

Hereinafter, as an embodiment of the present invention, an example of disassembling a chimney, which is a tubular structure, will be described in detail with reference to the drawings.

When disassembling the chimney 100, first, as shown in FIG. 1, a scaffold 200 is provided on the inner peripheral side of the chimney 100. The scaffolding 200 is provided with, for example, upper and lower scaffolding sets 210 in which an upper scaffolding 210a and a lower scaffolding 210b, which are framework scaffolding, are stacked in multiple stages. Each upper and lower scaffolding set 210 is configured such that the work floor 212 is placed on the scaffolding frame set 211, as shown in FIGS. 2 and 3, for example. Further, an elevating staircase 213 is provided at the center of the scaffolding framework 211. The scaffolding framework 211 can be appropriately brought into contact with the inner peripheral surface of the chimney 100 and fixed. The scaffolding is not limited to the framework scaffolding as described above, and a so-called single-tube scaffolding may be used.

If there are structures (inner cylinder, deck, ladder, etc.) inside the chimney, the scaffolding 200 as described above may be provided after first removing them.

When the scaffolding 200 as described above is provided inside the chimney 100 to the vicinity of the top, then, as shown in FIG. 4, a core drilling hole 100a (through hole) having a diameter of about 200 mm is formed in the chimney 100 by the core drill 310. It is open at four locations on the wall surface at approximately equal intervals in the circumferential direction. In that case, for example, it is preferable to supply cooling water from the inner peripheral side of the chimney 100. The height position of the core boring hole 100a is set to, for example, about 1200 mm above the work floor 212, which is the bottom of the uppermost upper and lower scaffolding assembly 210 shown in FIG. As a result, when the chimney 100 is cut at this height position and the upper portion is removed, the remaining portion of the chimney 100 acts like a handrail, so that the safety of work can be easily enhanced. That is, the chimney 100 itself can function as a fence for fall prevention. The core boring hole 100a may be perforated in advance for the subsequent cutting of the lower chimney 100.

Next, for example, as shown in FIG. 5, the diamond wire 411 is hung from the uppermost work floor 212, and the harken 412 is projected from the core boring hole 100a to pull in the diamond wire 411. Next, as shown in FIG. 6, the uppermost scaffolding set 210 is lifted by a crane or the like via a wire 510 or the like and lowered to the ground. It may be disassembled at the upper part of the chimney 100 and then lowered by a crane or the like, or may be lowered inside the chimney 100. In parallel, the next cutting operation can be performed on the upper part of the chimney 100.

Then, as shown in FIG. 7, the diamond wire 411 is hung around a quarter portion of the chimney 100 facing each other in the circumferential direction and set in the wire saw 413. In this way, the wire saw 413 can easily cut the two portions of the chimney 100 in the circumferential quarter. At this time, by supplying cooling water to the cut portion from the inner peripheral side of the chimney 100, it is possible to easily cool the cut portion and reduce the generation of dust. When the cutting is completed, then, as shown in FIG. 8, for example, by driving the taper liner 414 into the cutting portion and then cutting the remaining part of the chimney 100 with the wire saw 413 in the same manner, the chimney 100 The upper part can be cut into round slices. In addition, in order to cut the chimney 100 into round slices, not only the wire saw 413 but also various other cutting methods may be applied. Further, the cutting is not limited to four places in the circumferential direction, and may be cut into six places or the like.

Further, prior to the above-mentioned cutting, or preferably before being completely cut, it is lifted by a crane or the like (not shown) via, for example, a chain sling 511, a wire 512, a suspension balance 513, and a wire 514 as shown in FIG. When the cutting is completed, the cut chimney 100 portion is lifted and lowered to the ground as shown in the figure. The method of lifting the chimney 100 is not limited to the above, and may be applied according to various situations such as the scale and height of the chimney 100. That is, as described above, the core boring hole 100a for passing the diamond wire 411 of the wire saw 413 may be used so that the chain sling 511 is hooked on the upper inner peripheral side of the core boring hole 100a, or separately. A through hole for lifting may be formed, or a hanging metal fitting provided on the chimney 100 may be used.

By repeating the above work, the lower part of the chimney 100 can be disassembled, but the lower part lower than, for example, 30 m where the tip of the heavy machine can reach may be dismantled by the heavy machine.

By performing almost all the drilling work and chimney cutting work inside the chimney as described above, the risk of collapse, flying, falling, etc. of equipment and temporary materials used for demolition work can be greatly reduced. can. In addition, the scattering of cooling water to the outside during core boring and wire saw cutting can be significantly reduced or substantially suppressed. Further, the noise to the outside can be easily reduced. Therefore, for example, dismantling in an area near a private house can be easily performed. Further, even when a strong wind such as a typhoon is predicted, it is not necessary to remove or evacuate the chimney 100 like a scaffold provided on the outer periphery thereof, so that it is easy to avoid deterioration of workability. can.

In addition, the amount of scaffolding material can be reduced, the construction period for constructing the scaffolding material can be shortened, and the cost can be easily reduced.

Further, the dismantling work is easy regardless of the shape of the chimney (for example, when the thickness is constant or the thickness becomes extremely thick toward the bottom).

100 Chimney 100a Core boring hole 200 Scaffolding 210 Upper and lower scaffolding set 210a Upper scaffolding 210b Lower scaffolding 211 Scaffolding frame 212 Work floor 213 Elevating stairs 310 Core drill 411 Diamond wire 412 Haken 413 Wire saw 414 Tapered liner 5 Wire

Claims (7)

It is a method of dismantling a tubular structure.
The scaffolding process of providing a scaffold on the inner peripheral side of the tubular structure and
The cutting process of cutting the upper part of the tubular structure into round slices from the inner peripheral side,
The cutting part descent process of lifting the cut part of the tubular structure and lowering it to the ground,
The scaffolding descent process of lowering the upper part of the scaffolding to the ground,
A method for dismantling a tubular structure, which comprises. The method for dismantling a tubular structure according to claim 1.
The cutting step is a method for dismantling a tubular structure, which comprises cutting the tubular structure at a position higher than the work floor of the scaffold. The method for disassembling a tubular structure according to any one of claims 1 and 2.
The cutting step is a method for disassembling a tubular structure, which comprises forming a plurality of through holes on the wall surface of the tubular structure and then cutting the tubular structure by passing a wire of a wire saw through the plurality of through holes. The method for disassembling a tubular structure according to any one of claims 1 to 3.
The cutting step is a method for disassembling a tubular structure, which comprises a step of supplying cooling water from the inner peripheral side of the tubular structure to the cut portion. The method for disassembling a tubular structure according to any one of claims 1 to 4.
The cutting portion lowering step is a method for disassembling a tubular structure, characterized in that a lifting member is hung on the upper inner peripheral side of a through hole formed in the wall surface of the tubular structure to lift the tubular structure. The method for disassembling a tubular structure according to any one of claims 1 to 5.
The scaffold descent step is a method for dismantling a tubular structure, characterized in that the upper portion is lifted and lowered to the ground. It is a method of dismantling a tubular structure.
The upper part of the tubular structure is disassembled by at least one of the dismantling methods of claims 1 to 6.
A method for dismantling a tubular structure, which comprises dismantling the lower part of the tubular structure with a heavy machine.

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