JPS5953991B2 - Dismantling method of stacked shaped steel chimney and repair method to individual chimney - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of dismantling a chimney made of assembled shaped steel and a method of repairing the chimney to a single chimney.

A stacked shaped steel chimney is made up of a plurality of steel smoke pipes arranged in parallel, with the tops of the smoke pipes close to each other.

Several years after construction, these steel chimneys may need to be dismantled or renovated due to changes in industrial operating systems or corrosion of the steel due to sulfur oxides in flue gas.

When carrying out such demolition or renovation, it is necessary to set up a work scaffold at the construction location and to set up a new work scaffold as the demolition work progresses.

This work on scaffolding is extremely dangerous and is affected by outside air conditions such as wind and rain, so dismantling and repairing it involves many dangers and takes a lot of time.

This invention was devised to solve these conventional problems, and is a demolition method that reduces the number of work scaffolds installed, reduces construction costs, and allows work to be carried out quickly and safely under safe working conditions. and to provide repair methods.

The demolition method according to the present invention is to separate and remove each smoke pipe using a frame suspended in a space surrounded by smoke pipes at the top of a chimney made of assembled shaped steel as a scaffold. The renovation method involves performing such demolition at the top of the chimney, and then penetrating the frame with a new smoke pipe with a larger diameter than each smoke pipe, and installing it upright while being supported by the frame. It is.

Next, an embodiment of the repair method according to the present invention will be described in the order of construction based on the drawings.

i Smoke pipe 1. 2. 3 are installed in parallel and each smoke pipe 1. 2. In a chimney stack 4 made of assembled shaped steel, the tops of which are made close to each other, a pulley 5 is attached to the top, a pulley 6 is attached to the ground, and a winch 7 is installed above the ground.

The wire 8 of this winch 7 is wound around the pulley 6.5 one after another, and from the pulley 5, the smoke pipe 1. 2. A wire 8 is suspended within the space surrounded by 3.

The lower end of the hanging wire 8 is connected to the frame 9, and
lift up.

(Figures 1 and 2) ii Smoke pipe 1. 2.
The frame 9 is lifted up to the top of the space surrounded by the pipes 3, and the frame 9 is supported and fixed by the smoke pipes 1, 2.3.

(Fig. 3) At this time, the upper end of the frame 9 is connected to the smoke pipe 1 by the jack 10. 2. 3, and its lower end is connected to the smoke pipe 1°2.3 by means of a jack 11, thereby supporting the frame 9.

(FIG. 4) A support tower 12 is provided on the frame 9 so as to be movable up and down, and the support tower 12 can protrude above the upper end of the frame 9.

(Fig. 4) iii The support tower 12 is pushed upward and its upper end is connected to the adjacent smoke pipe 1. 2
．． 3. Place it in contact with the lower side of 3.

As a result, the tops of the smoke pipes 1, 2, 3 are supported by the frame 9 via the support tower 12.

(Figure 5) iv Smoke pipe 1. 2. The support tower 12 and the frame 9 are lowered while separating and removing the portion above the predetermined position A at the top of the support tower 3 from below.

(Figs. 6 to 8) V After the removal of the parts above position A of the smoke pipes 1, 2, and 3 is completed, lower the support tower 12 to the ground (Fig. 8), and at position A. Smoke pipe 1. 2. 3 are connected by a beam 13, and this beam 13 is supported by a frame 9.

(Fig. 9) vi At position B below position A, smoke pipe 1,
2. 3, and remove the smoke pipe 1 above this position B. 2. The frame 9 is lowered while separating and removing the portion 3 from below.

At this time, a pulley 14 is attached to the beam 13, a wire 8 is wound around the pulley 14, and the smoke pipe 1. 2. Unload the section 15 of No. 3.

(Figures 10 to 12) By repeating these operations, almost the entire chimney 4 can be dismantled, but if the chimney 4 is to be completely dismantled, the last remaining part must be removed using a truck crane, etc. .

If repairs are to be carried out, such demolition should be stopped at position B.

■ii After the separation and removal to position B is completed, the frame 9 is raised and the upper end of the frame 9 becomes the original smoke pipe 1.
2. When the frame 9 rises to the upper end of 3, the smoke pipe 1. 2. It sticks to 3.

(Figure 13) viii Smoke pipe 1. 2. A new smoke pipe 16 having a hydraulic average depth equal to the sum of the hydraulic average depths of 3 is erected from the ground, and this smoke pipe 1
6 is supported by the frame 9 while passing through the frame 9.

(Figs. 14 and 15) In such a repair method, the smoke pipe 1. 2. Since the part above the predetermined height is divided and removed while supporting the part above the predetermined height in No. 3, the renovation can be carried out without constructing many scaffolds.

Further, since the frame 9 and the support tower 12 are appropriately raised and lowered during the division and removal, the division and removal work can be performed with high efficiency.

Furthermore, a new smoke pipe 16 is connected to the existing smoke pipe 1 through the frame 9. 2. 3, a separate support means for the smoke pipe 16 is not required.

[Brief explanation of drawings]

1 and 2 are front views sequentially showing the first stage in an embodiment of the repair method according to the present invention, FIGS. 3 and 4 are front views sequentially showing the second stage, and FIG. 5 is a front view sequentially showing the second stage. Front view showing the three stages; Figures 6 to 8 are front views showing the fourth stage; Figure 9 is a front view showing the fifth stage; Figures 10 to 12.
The figure is a front view showing the sixth stage, FIG. 13 is a front view showing the seventh stage, and FIGS. 14 and 15 are front views sequentially showing the eighth stage. 1, 2. 3... Smoke pipe, 4...
・・Collected shaped steel chimney, 5, 6・・Pulley, 7・
...Winch, 8...Wire, 9...
... Frame, 10, 11... Jacket, 12.
...Support tower, 13 ...Beam, 14
...Pulley, 15...Slice, 16...
...Pipe for smoking.

Claims (1)

[Scope of Claims] 1. When dismantling a stacked steel chimney made up of a plurality of steel smoke pipes erected in parallel with the tops of the smoke pipes placed close to each other, the above-ground lifting equipment The frame is lifted by a cable that hangs down through the top of the collective shaped steel chimney into a space surrounded by smoke pipes, and the frame is positioned within the space surrounded by the smoke pipes of the collective shaped steel chimney. A method for dismantling a chimney made of assembled shaped steel, in which the frame is supported by a smoke pipe, a portion of the smoke pipe that is above a predetermined height is supported by the frame, and the portion that is above the predetermined height is divided and removed. 2. When converting a stacked steel chimney, which consists of multiple steel smoke pipes erected in parallel and the tops of the smoke pipes are placed close to each other, into an individual chimney, the stacked type chimney will be removed from the above-ground lifting equipment. The frame is lifted by a cable that hangs down through the top of the steel chimney and into the space surrounded by the smoke pipe, and the frame is positioned in the space surrounded by the smoke pipe at the top of the aggregated steel chimney. , This frame is supported by a smoke pipe, and the part of the smoke pipe that is above a predetermined height is supported by the frame, and the part that is above the predetermined height is divided and removed to create a space surrounded by the smoke pipe. A method of repairing a stacked steel chimney to a single chimney, in which a new smoke pipe with a larger diameter than the smoke pipe is passed through the frame and erected while being supported by the frame.