JPH0613796B2 - Dismantling method of tubular concrete structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for dismantling a tubular concrete structure such as a chimney or silo.

<< Prior Art >> As is well known, tubular concrete structures such as chimneys and silos are dismantled and removed when they are no longer needed or when they are rebuilt.

As a method for dismantling such a structure, for example, a method of assembling a scaffold around the outer periphery of a tubular concrete structure and sequentially dismantling it from the upper side of the structure manually using a hand tool, or using an explosive Conventionally, a method of collapsing objects to dismantle them all at once has been provided.

However, the former construction method has a problem in terms of cost because it requires a construction period and construction cost, and the latter construction method has a great influence on surrounding structures, and thus has a problem in safety.

Therefore, for example, it is possible to apply a wire saw method in which a diamond wire is wound around the outer periphery of a tubular structure, and the wire is rotated at a high speed to cut the structure into slices and sequentially remove it from the upper side. .

According to this wire saw method, the rotation of the diamond wire can be controlled remotely from the ground, which is more economically advantageous and safer than the manual method, but this method will also be described below. There was a problem to do.

<< Problems to be Solved by the Invention >> That is, in the wire saw method described above, since the cylindrical structure is sequentially sliced from above, the winding position of the diamond wire must be shifted downward every time the cutting operation is completed. I have to.

Therefore, although the construction period can be shortened as compared with the dismantling work by human power, the construction period cannot be shortened sufficiently because the winding work is repeated a plurality of times.

The present invention has been made in view of such conventional problems, the purpose is to easily and safely work without requiring a lot of manpower,
An object of the present invention is to provide a method for dismantling a tubular concrete structure that can easily reduce the construction cost and the construction period.

<< Means for Solving Problems >> In order to achieve the above object, the present invention provides a method for dismantling a hollow edged cocrete structure such as a chimney having an open upper end, in which the tubular concrete structure has an open end. A funnel-shaped expandable blade mouthpiece is attached, and a tension member is provided between the blade mouthpiece and a diameter-expandable fixing portion provided inside the concrete structure, and the blade is installed. It is characterized in that the concrete structure is dismantled while lowering the blade mouth toward the fixing part by pulling this downward through the tension member while urging the mouth in the expanding direction. .

<Operation> According to the method for disassembling a tubular concrete structure having the above-described configuration, the blade body attached to the open end of the structure can be expanded, so that the cross-sectional diameter changes in the height direction, for example. It can also be applied to structures.

In addition, since a tension member is installed between the blade body and the fixing unit, the blade body is disassembled by pulling while urging the blade body in the expanding direction,
It is possible to easily dismantle tall structures by reassembling the fixing section.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show an embodiment of a method for disassembling a tubular concrete structure according to the present invention, in which the sectional diameter of the tubular concrete structure is gradually reduced in the height direction. The method of dismantling the chimney 10 is shown.

When dismantling the chimney 10 with the upper end open, first,
The blade body 12 is attached to the open end.

In this embodiment, as shown in FIGS. 1 and 2, the blade body 12 includes a blade bit 12a protruding from the outer peripheral surface and a blade unit 12b divided into four in the circumferential direction. The tip end side is connected with a pin 14 to form a funnel shape that can be opened, and a pair of diameter-expanding jacks 16 and 16 are internally provided between the opposing blade opening units 12b and 12b.

Then, a tension member 18 made of a PC cable is hung at the lower end of the blade body 12 via various attachment fittings 15 such as attachment hooks and U-shaped bolts. In addition, this tensile member 18
A fixing unit 20 that is fixed to the inner surface of the chimney 10 and that can be regenerated is suspended and installed in the lower part of the.

The fixing unit 20 has a diameter-expandable annular frame 22 that abuts the inner surface of the chimney 10, a pair of jacks 24 and 24 provided inside the annular frame 22, and the annular frame 22 that penetrates the annular frame 22. Attached to the lower end of the tension member 18 and supporting iron plate 2
5 and a tension jack 26 fixed to the lower end surface of the annular frame 22.

The pair of jacks 24, 24 are attached so as to be slightly eccentric from the center of the annular frame body 22 so that they do not interfere with the tension members 18 passing through the center of the annular frame body 22.

Further, it is preferable to attach an annular sheet 28 having a weight attached to the lower end to the expanded end of the blade body 12 because it is possible to prevent scattering of lumps due to the rupture of the chimney 10 during disassembly.

Then, in order to dismantle the chimney 10 according to this embodiment, a blade machine 12, a tension member 18,
After attaching the fixing portion 20 and the like at a predetermined position of the chimney 10, the diameter-expanding jack 16 of the blade body 12 is extended to extend the blade bit 12a.
Abutting against the inner surface of the chimney 10, and further urging this in the expanding direction, drive the tension jack 26 of the fixing portion 20 fixed below the chimney 10 to move the blade 12 through the tension member 18. Pull downwards. Then, the blade body 12 gradually descends from the opening end of the chimney 10 toward the fixing unit 20, and
The chimney 10 is gradually crushed and disassembled from the opening end side.

Then, when the blade mouth body 12 descends to the vicinity of the fixing portion 20, after the driving of the diameter expansion jack 16 and the tension jack 26 is stopped for a while, the jack 24 of the annular frame body 22 is loosened and the tension jack 26 is operated to form an annular shape. The frame 22 is rearranged downward, and the expanding jack 16 again applies a biasing force in the expanding direction and a tensile force by the tension jack 26. By repeating this operation in sequence, the lower part of the chimney 10 is crushed and then dismantled. Ends.

Here, since the PC cable is used as the tension member 18 in this embodiment, the tension member 18 protruding below the tension jack 26 is free due to the flexibility of the PC cable even when the fixing portion 20 is close to the ground. Therefore, the work will not be hindered by the interference with the ground.

Now, if the chimney 10 is dismantled by the following method, the blade body 12 can be expanded, so that the chimney 10 whose cross-sectional diameter changes in the height direction can be easily installed.

Further, a tension member 18 is installed between the blade body 12 and the fixing unit 20, and the blade body 12 is urged in the expanding direction by the diameter expansion jack 16 while being pulled by the tension jack 26 via the tension material 18. Since the chimney 10 is crushed and disassembled by pulling the blade 12, the high-rise or super-high-rise chimney 10 can be easily crushed and disassembled if the fixing unit 20 is sequentially relocated downward.

In this case, since the fixing portion 20 is configured such that the diameter thereof can be expanded by the annular frame 22 and the jack 24, the refilling work can be performed easily and quickly.

In this case, in order to stop driving the jacks 16, 24, 26, for example, each of the jacks 16, 24, 26 is configured by a hydraulic jack, and oil is sent by a hose from a hydraulic unit installed on the ground to perform remote control. Controlled by.

The remounting work of the fixing unit 20 is performed on the chimney 1 to be dismantled.
When 0 is not too high, it is possible to set the fixing unit 20 near the ground in the chimney 10 and dismantle it without performing any rearrangement work.

<< Effects of the Invention >> As described in detail in the above, according to the method for disassembling a tubular concrete structure according to the present invention, many dismantling operations after the blade body and the fixing portion are installed, The work cost can be reduced and the construction period can be easily shortened by performing the work easily and safely without requiring human labor.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing an embodiment of the method of the present invention.
The figure is a plan view of the blade body. 10 ... Chimney, 12 ... Blade opening 12a ... Blade opening bit, 12b ... Blade opening unit 16 ... Expanding jack, 18 ... Tensile material 20 ... Fixing part, 26 ... Tensile jack

Claims (1)

[Claims] 1. A method for disassembling a hollow tubular concrete structure such as a chimney having an open upper end, wherein a funnel-shaped expandable blade body is attached to the open end of the tubular concrete structure, and A tension member is provided between the blade body and a fixing portion capable of expanding the diameter provided inside the concrete structure, and the tension member is urged in the expanding direction while the tension member is interposed. A method for disassembling a tubular concrete structure, characterized in that the concrete structure is disassembled while pulling the blade downward so that the blade body is lowered toward the fixing section.