JP2020002617A - Demolition method of cylindrical structure - Google Patents

Abstract

To provide a demolition method of a cylindrical structure capable of preventing adverse effect to peripheral environment and improving workability and safety when demolishing the cylindrical structure.SOLUTION: A demolition method of a cylindrical structure (chimney 100) comprises: a scaffold assembly process constructing scaffold 200 on an inner peripheral side of the chimney 100; a cutting process cutting an upper parts of the chimney 100 from the inner peripheral side in circular slices; a cut part lowering process lifting the circular cutting slices of the chimney 100 and lowering it to the ground; and a scaffold lowering process lowering upper parts of the scaffold 200 to the ground.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD 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, there is known a technique for dismantling the tubular structure using a work scaffold removably attached to a band in surface contact with the outer peripheral surface of the tubular structure. (For example, see Patent Document 1).

  Further, there is known a technique of using a chimney dismantling scaffold provided with a work floor provided around a chimney, using a chimney with a concrete breaker or the like, dropping concrete block pieces into the inside of the chimney, and dismantling (for example). And Patent Document 2.).

JP 2000-170376 A JP-A-2017-31681

  However, when scaffolding is provided on the outer periphery of the chimney and concrete is peeled off, the surrounding environment such as noise, dust, and falling objects is likely to be affected. Further, when a typhoon, a strong wind, or a gust occurs, the work becomes difficult.

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

To achieve the above objectives,
The present invention
A method for dismantling a tubular structure,
A scaffolding assembling step of providing a scaffold on the inner peripheral side of the tubular structure;
A cutting step of cutting the upper portion of the tubular structure into a circular slice from the inner peripheral side,
A cutting part lowering step of lifting the ring-shaped cutting part of the tubular structure and lowering it to the ground,
A scaffold lowering step of lowering the upper part of the scaffold to the ground,
It is characterized by having.

  Accordingly, the chimney cutting operation can be performed inside the chimney, so that the influence on the surrounding environment can be reduced, and the workability and safety can be easily improved.

  ADVANTAGE OF THE INVENTION According to this invention, influence on a surrounding environment can be suppressed small, and workability and safety can be easily improved.

It is a longitudinal cross-sectional view which shows the state in which the scaffold was provided in the chimney. It is a front view which shows the structure of a scaffold. It is a top view showing composition of a scaffold. It is a longitudinal cross-sectional view which shows the process of core boring. It is a longitudinal cross-sectional view which shows the process of attaching the wire of a wire saw. It is a longitudinal cross-sectional view which shows the process of lifting the uppermost upper and lower scaffold group. It is a top view which shows the 1st cutting process with a wire saw. It is a top view which shows the 2nd cutting process with a wire saw. It is a longitudinal cross-sectional view which shows the process of raising the cut part of a chimney.

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

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

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

  When the scaffold 200 as described above is provided near the top inside the chimney 100, then, as shown in FIG. 4, a core boring hole 100a (through hole) having a diameter of about 200 mm is formed in the chimney 100 by a core drill 310, for example. It is provided at four locations at substantially equal intervals in the circumferential direction of the wall surface. In this case, it is preferable to supply the cooling water from the inner peripheral side of the chimney 100, for example. The height position of the core boring hole 100a is set to, for example, about 1200 mm above the work floor 212 corresponding to the bottom of the uppermost upper and lower scaffold set 210 shown in FIG. Thereby, when the chimney 100 is cut off at this height position and the upper part is removed, the remaining chimney 100 works like a handrail, so that the safety of work can be easily increased. That is, the chimney 100 itself can function as a fence for preventing the fall. The above-described core boring hole 100a may be sequentially drilled for cutting the lower chimney 100 below.

  Next, as shown in FIG. 5, for example, the diamond wire 411 is hung from the uppermost work floor 212, and the diamond wire 411 is drawn in by protruding the harken 412 from the core boring hole 100a. Next, as shown in FIG. 6, the uppermost upper and lower scaffolding set 210 is lifted by a crane or the like via the wire 510 or the like and is lowered to the ground. In addition, after being disassembled at the upper part of the chimney 100, it may be dropped by a crane or the like, or may be dropped inside the chimney 100. However, when disassembled after being dropped on the ground, during disassembly, At the same time, the next cutting operation can be performed above the chimney 100.

  Then, as shown in FIG. 7, the diamond wire 411 is wrapped around two opposite quarters of the chimney 100 in the circumferential direction and set on the wire saw 413. In this way, the wire saw 413 easily cuts two portions, one quarter in the circumferential direction of the chimney 100. At this time, by supplying cooling water to the cutting portion from the inner peripheral side of the chimney 100, the cutting portion can be cooled and the generation of dust can be easily reduced. When the cutting is completed, next, as shown in FIG. 8, for example, a taper liner 414 is driven into the cut portion, and the remaining portion of the chimney 100 is cut by the wire saw 413 in the same manner. The upper part can be cut into slices. In addition, in order to cut the chimney 100 into slices, not only the wire saw 413 but also various other cutting methods may be applied. In addition, the cutting is not limited to four places in the circumferential direction, but may be cut into six places or the like.

  Prior to the cutting, or preferably, before the cutting is completed, the hoist is lifted by a crane or the like (not shown) via a chain sling 511, a wire 512, a hanging balance 513, and a wire 514 as shown in FIG. When the cutting is completed and the cutting is completed, the cut chimney 100 is lifted and lowered to the ground as shown in FIG. The method of lifting the chimney 100 is not limited to the above, and may be applied in accordance with various situations such as the size and height of the chimney 100. That is, using the core boring hole 100a for passing the diamond wire 411 of the wire saw 413 as described above, the chain sling 511 may be hooked on the upper inner peripheral side of the core boring hole 100a. A through hole for lifting may be formed, or a hanging fitting provided on the chimney 100 may be used.

  By repeating the above operations, the lower part of the chimney 100 can be dismantled, but the lower part lower than, for example, 30 m, to which the tip of the heavy equipment reaches, may be dismantled by the heavy equipment.

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

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

  In addition, it is easy to perform the dismantling work without being affected by the shape of the chimney (for example, when the thickness is constant or the thickness becomes extremely thicker downward).

DESCRIPTION OF SYMBOLS 100 Chimney 100a Core boring hole 200 Scaffold 210 Upper and lower scaffold group 210a Upper scaffold 210b Lower scaffold 211 Scaffold framework 212 Work floor 213 Elevating stairs 310 Core drill 411 Diamond wire 412 Harken 413 Wire saw 414 Taper liner 510 Wire 511 Chain weighing 513 Wire

Claims (7)

A method for dismantling a tubular structure,
A scaffolding assembling step of providing a scaffold on the inner peripheral side of the tubular structure;
A cutting step of cutting the upper portion of the tubular structure into a circular slice from the inner peripheral side,
A cutting part lowering step of lifting the ring-shaped cutting part of the tubular structure and lowering it to the ground,
A scaffold lowering step of lowering the upper part of the scaffold to the ground,
A method for dismantling a tubular structure, comprising: It is a dismantling method of the cylindrical structure of Claim 1, Comprising:
The said cutting process cut | disconnects the said cylindrical structure in the position higher than the work floor of the said scaffold, The dismantling method of a cylindrical structure characterized by the above-mentioned. A method for dismantling a tubular structure according to any one of claims 1 and 2,
In the cutting step, a plurality of through-holes are formed in a wall surface of the tubular structure, and the plurality of through-holes are cut through a wire saw wire. A method for dismantling a tubular structure according to any one of claims 1 to 3,
The method for dismantling a tubular structure, wherein the cutting step includes a step of supplying cooling water to a cut portion from an inner peripheral side of the tubular structure. A method for dismantling a tubular structure according to any one of claims 1 to 4,
The dismantling method of a tubular structure, wherein the cutting portion lowering step is performed by hanging a lifting member on an upper inner peripheral side of a through hole formed in a wall surface of the cylindrical structure. A method for dismantling a tubular structure according to any one of claims 1 to 5,
The method for dismantling a tubular structure, wherein the scaffold lowering step includes lifting the upper portion and lowering the upper portion to the ground. A method for dismantling a tubular structure,
Dismantling the upper part of the tubular structure by at least one of the dismantling methods according to claims 1 to 6,
A method for dismantling a tubular structure, comprising dismantling a lower portion of the tubular structure with a heavy machine.