JP2002013300A - Method for collapsing chimney structure supported by three or four columns - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and economically collapse a chimney structure supported by three or four columns in a short construction period in a satisfactory direction. SOLUTION: In this method for collapsing the chimney structure supported by the three columns, the chimney structure supported by the three columns is provide with a balance structure in which tie rods 1 are joined to integrate a cylinder D with the three columns A, B, and C. The lower part of one column A to be in the direction of collapse is removed. A notch is formed in the cylinder D, and the axis of collapse is reinforced. The above-mentioned processes are performed in any given procedure. The remaining two columns B and C are cut, lifted up by jacks, etc., and collapsed in the direction of the column A with its lower part removed with the cylinder D to be the fulcrum of collapse as an axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collapsing a chimney structure supported by three or four pillars safely, economically, in a short period of time, and with good directionality.

[0002]

2. Description of the Related Art Due to aging and factory shutdown,
In some cases, it is necessary to remove a chimney consisting of three pillars (A), (B) and (C) with a height of 100 m or more as shown in Fig. 1 and Fig. 2; As a rule, the reverse order demolition method of construction was the mainstream.

Further, as shown in FIGS.
Four pillars (E), (F), (G), (H) such as 0 m or more
In order to remove the chimney composed of the above, for the same reason as described above, the reverse order of the construction method and the collapse method according to JP-A-63-14962 (Japanese Patent Publication No. 6-33684) were the mainstream.

[0004]

[0005] However, the above-mentioned reverse order disassembly method of erecting method has many drawbacks in that it involves a lot of work at high places, is extremely dangerous, and has high dismantlement construction costs and a long construction period. .

[0005] The present invention solves the above-mentioned drawbacks of the conventional method,
An object of the present invention is to provide a method of collapsing a chimney structure supported by three pillars, which is excellent in direction of collapse and also advantageous in safety, construction cost and construction period.

A collapse method of a chimney structure supported by four pillars according to Japanese Patent Application Laid-Open No. 63-14962 (Japanese Patent Publication No. 6-33684) removes one pillar as shown in FIG. Direction of the removed column (Y1, Y2, Y3 or Y4)
The collapse direction is 4 and the collapse direction is 4
Limited to direction. For this reason, if sufficient vacant land cannot be secured in each collapse direction, it has been difficult to adopt the method.

According to the present invention, a direction (X
1, X2, X3 or X4) to provide a method of collapsing a chimney structure supported by four pillars, which is advantageous when there is sufficient open space in this direction. Things.

[0008]

Means for Solving the Problems (1) In a chimney structure supported by three pillars, a tubular body and a connecting material for integrating the three pillars are joined to form a balance structure, To remove the lower part of one pillar, cut out the tubular body and reinforce the collapsing axis in any procedure, cut the remaining two pillars and lift them using jacks, etc.
A method of collapsing a chimney structure supported by three pillars, comprising collapsing in the direction of a pillar whose lower part has been removed, with the cylinder body serving as the fulcrum of the collapse as an axis. (2) In a chimney structure supported by four pillars, a connecting member that integrates the cylindrical body and the four pillars is joined to form a balance structure. Remove the lower parts of the two pillars at both ends of one side perpendicular to the direction, cut out the tubular body and reinforce the collapsible shaft by any procedure, cut the remaining two pillars and use jacks etc. A chimney structure supported by four pillars, wherein the chimney structure supported by four pillars is lifted and collapsed in a direction orthogonal to one side connecting two pillars whose lower parts have been removed, with the cylinder body serving as a fulcrum of the collapse being used as an axis Collapse method.

In the above description, the "balance structure" means a structure in which all the weights of the columns are received by the cylinder, and the columns are suspended from the cylinder.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The first feature of the present invention, which is the collapse feature of a chimney structure supported by three pillars, is as follows.

As shown in FIG. 2, a support 3 for supporting the tubular body (D) is provided.
The columns (A), (B), and (C) have an equilateral triangle in plan view. In general, the collapse of a small-scale chimney is, for example, as shown in FIG. 2, with two pillars (A) and (B) as fulcrums.
It is possible to collapse in the Y direction. However, as mentioned at the beginning, the height of the chimney is as high as 100m,
In the case of a large-scale one where the distance between the column fulcrums is more than 30 m, the center of gravity is located at the cylindrical body position, and this is divided into two columns (A),
Until the fulcrum of (B) can be freely collapsed, it is necessary to push up the column (C) to a considerable height or to pull it with a wire or the like from the near side, but in practice, both are used. It is difficult.

In the present invention, when viewed in a plane, the tube body (D) is used as a fulcrum to collapse in the X direction, for example. First, as shown in FIGS. 1 and 2, three pillars (A) are used. , (B),
As shown in FIG. 3, (C) and the tubular body (D) are integrated into a balance structure by a diagonal member 1 attached diagonally downward from the tubular body to each column. Then, the column (A) in the collapse direction that obstructs collapse is removed 13 from the column base to a height that does not obstruct collapse (see FIG. 5). this is,
As the structure of the chimney, since the cylinder body (D) undergoes thermal expansion and contraction due to the heat from the exhaust received during operation, most of the chimney structures are composed of the cylinder body (D) and the columns (A), (B), ( C) and
As shown in Fig. 1, the support ring installation positions (,,,
,), As shown in FIG. 4, the pillars (A),
(B) a support ring connected from the members of (C);
A gap is provided between the cylindrical body (D). For this reason,
When removing the column (A) without providing the balance structure constituted by using the above-described diagonal member 1, the columns (A), (B), and (C)
The entire body is tilted in the collapse direction, the center of gravity is eccentric from the cylinder body (D) in the collapse direction, and the collapse design becomes difficult, and the danger of collapse during the collapse work procedure is greatly increased. In order to solve this concern, a balance structure was adopted to take into account the weight reduction due to the removal of part of the pillar (A) around the tubular body (D) even after the pillar (A) was removed. While doing, each pillar (A), (B),
(C) can be prevented from hanging and tilting with each other, and it is possible to maintain the state where the position of the center of gravity of the entire body is positioned on the cylindrical body (D). Then, the remaining two columns (B) and (C) can be collapsed by pushing them up with a small force and a small height.

Further, in the present invention, since the cylindrical body is used as the collapse axis, it becomes one fulcrum when viewed from the whole of the chimney structure, and the collapse becomes very unstable. It is preferable to increase the reliability of the direction of collapse or collapse, so that a special reinforcing material is joined to the tubular body (D) serving as a fulcrum and cut out as described in detail in an embodiment described later. By doing so, concerns can be resolved.

The collapse of the chimney structure supported by four pillars, which is the second feature of the present invention, is as follows.

As shown in FIG. 10, four pillars (E), (F), (G), and (H) supporting the tubular body (I) are arranged at respective vertex positions of a regular square in plan view. ing. JP-A-63-1
According to the collapse method according to No. 4962 (Japanese Patent Publication No. 6-33684), the lower part of one pillar is removed and collapsed in the direction of the removed pillar (Y1, Y2, Y3 or Y4). Since the direction is limited to four directions, if there is not enough open space for each collapse direction,
Difficult to hire.

In the present invention, by adopting the method of the above-mentioned item (2), the collapse in the direction (X1, X2, X3 or X4) orthogonal to the line connecting the two columns at the adjacent vertices is realized. It is possible to provide a collapse method of a chimney structure supported by four pillars, which is advantageous when there is sufficient open space in this direction. In other words, it is possible to select from eight directions in which the collapse direction is doubled, including the conventional method.

More specifically, as shown in FIG. 10, when viewed in a plane, the cylinder body (I) is used as a fulcrum, for example, X
Four pillars (E), which will collapse in one direction
(F), (G), (H) and the tubular body (I) have a balance structure integrated by a diagonal member 1 attached diagonally downward from the tubular body to each column, as shown in FIG. Pillars (E) and (F) on the collapsing direction that hinder the collapse are removed from the column base to a height that does not hinder the collapsing, and the same as in the case of the three pillars in the above item (1). It is to be implemented.

[0018]

EXAMPLE 1 An example of collapse of a chimney structure supported by three pillars will be described with reference to the following (1a to 1i). (1a) Determining the collapse direction If there is a large open space around the area where the chimney is constructed, the collapse direction is not particularly limited, but in this embodiment, there is enough open space for the collapse in the X direction of FIG. The direction of collapse was (X) because it was away from the neighboring residents. (1b) Installation of the oblique material 1 having a balance structure As shown in FIG. 3, the cylindrical body (D) and the columns (A), (B),
The diagonal member 1 connecting to (C) is installed obliquely downward from the tubular body (D) to be a member that can sufficiently withstand the weight of each of the columns (A), (B), and (C). When local buckling occurs in the cylindrical body (D) and the columns (A), (B), and (C) to which the diagonal members 1 are joined, reinforcement is performed. (1c) Joining of support rings (,) As described above, the tubular body (D) and the column (A),
(B) and (C) are not connected in a normal state, so that the force pushing up the columns (B) and (C) is transmitted to the cylindrical body (D). As shown in the figure, a steel plate 2 or the like is inserted into the clearance of the support ring (in this embodiment) and connected by welding.

The support ring (,) is connected to a cylindrical body (D).
The advantage of being able to prevent the columns (A), (B) and (C) from rotating around the tubular body (D) when the columns (B) and (C) are pushed up is obtained.

As a means for transmitting the force to the cylindrical body (D), it is conceivable to use the diagonal member 1 described in the above (1b). However, since it becomes a compression member, the diagonal member 1 is sufficient. The above method is preferable because an excessively large member is required because the compressive strength is required. (1d) Installation of the lifting device on the columns (B) and (C) As shown in FIGS. 6 and 7, the lifting force receiving member 3 is placed below the columns (B) and (C) on the opposite side to the collapse direction. Then, a plurality of jacks 5 are installed between the member 3 and the foundation concrete 4 by welding.

If there is no suitable foundation concrete 4 at the place where the jack 5 is installed, it is manufactured first. (1e) Reinforcement of tubular body (D) As shown in FIGS. 7 and 8, for a tubular body (D) having a diameter of, for example, 6400 mm, a tubular body reinforcing material 6 is provided on both sides in a direction orthogonal to the collapse direction (X). To the cylindrical body (D) by welding. The reinforcing member 6 is only placed on the base plate 7 of the tubular body (D), and sufficiently withstands the weight of the chimney structure in its entire cross section, and has a flange 8 which is on the collapse direction side when collapsed.
It is sufficient to secure the strength that becomes the fulcrum of the collapse at the part.

Further, in order to secure the directional stability at the time of collapse, the steady rest member 9 is joined to the reinforcing member 6 by welding. The steady rest member 9 is placed on the foundation concrete 10 which has been built up to the upper surface height of the base plate 7. (1f) Cutting of the cylindrical body (D) As shown in FIG. 7, at the base of the cylindrical body (D), the collapse direction side from the flange 8 portion of the cylindrical body reinforcing member 6 serving as the collapse axis is
The cutting 11 is performed at an angle that does not hinder the collapse. Also,
A notch 12 is formed in a portion opposite to the collapse direction from the tubular body reinforcing member 6. (1g) Removal of the lower part of the column (A) The column (A) on the collapse direction side is hindered when collapsing and impairs the directivity. Therefore, as shown in FIG. It is preferable to perform the removal 13 work on the day of collapse. (1h) Cutting of pillars (B) and (C) As shown in FIG. 6, cutting 14 of pillars (B) and (C) is performed between the pillar and the push-up force receiving member 3. Cutting 14 is preferably performed immediately before collapse. (1i) Jack-up of pillars (B) and (C) The collapsing operation is started through the above steps, and the column receives the pushing force by the action of the jack 5 at the position shown in FIG. (B) and (C) to push up, to transmit a pushing force from the support ring (,) shown in FIG. 1 to the tubular body (D), and to provide a flange of the reinforcing member 6 of the tubular body (D) shown in FIGS. With the fulcrum 8 as a fulcrum, the whole can be collapsed in a predetermined direction (X) with good directivity.

Embodiment 2 Next, an embodiment of collapse of a chimney structure supported by four pillars will be described with reference to the following (2a to 2i). (2a) Determination of collapse direction As shown in FIG. 10, collapse directions Y1, Y2, Y3, Y4
Assumes that there is not enough open space for collapse and there is enough open space only for X1, and the collapse direction is X1. (2b) Installation of the oblique material 1 having a balance structure As shown in FIG. 3 (here, the symbols in the diagram are D, I, A, E, G, B, F, H. The same applies to the following.) The diagonal member 1 is connected diagonally to the tubular body (I) and the columns (E), (F), (G), and (H). (E), (F), (G), and (H) are members that can sufficiently bear the weight. In addition, the tubular body (I) and the columns (E), (F), (G), and (H) to which the diagonal members 1 are joined,
If local buckling occurs, reinforce. (2c) Joining of Support Rings (,) The support rings are connected and connected to the steel plates 2 in the same manner as in the collapsed example of the chimney structure supported by the three pillars. (2d) Installation of the lifting device on the pillars (G) and (H) As shown in FIG. 6 (B and C in FIG. 6), beneath the pillars (G) and (H) on the opposite side to the collapse direction. Are replaced with G and H), and the push-up force receiving member 3 is fixed by welding.
A plurality of jacks 5 are installed between the concrete and the foundation concrete 4.

If there is no appropriate foundation concrete 4 at the place where the jack 5 is installed, the first manufacturing is the same as the above (1d). (2e) Reinforcement of the tubular body (I) As shown in FIGS. 7 and 8 (the notation of D in this figure is read as I), the tubular body (I) is provided on both sides in the direction orthogonal to the collapse direction X1 with respect to the tubular body (I). The body reinforcement 6 is welded to the tubular body (I). The reinforcing member 6 is only placed on the base plate 7 of the tubular body (I). The reinforcing member 6 sufficiently withstands the weight of the chimney structure in the entire cross section, and the portion of the flange 8 which is on the collapse direction side when collapsed. Ensure the strength to serve as a collapse fulcrum.

Further, in order to secure the directional stability at the time of collapse, the steady rest member 9 is joined to the reinforcing member 6 by welding. The steady rest member 9 is placed on the foundation concrete 10 which has been built up to the upper surface height of the base plate 7. (2f) Cutting of the cylindrical body (I) As shown in FIG. 7, the cylindrical body (I) (in which D is read as I) is provided with a flange 8 of a cylindrical body reinforcing member 6 serving as a collapse axis.
The section 11 is cut 11 from the portion in the direction of collapse at an angle that does not hinder the collapse. Further, a notch 12 is formed in a portion opposite to the collapse direction from the tubular body reinforcing member 6. (2g) Removal of the lower part of pillars (E) and (F) Pillars (E) and (F) on the collapse direction side may hinder the collapse and impair the directivity. Here, the notation of A is replaced with E and F, and the notation of B is replaced with G and H), and then removed 13 from the pedestal to a predetermined height.
The removal 13 work is performed on the day of collapse. (2h) Cutting of pillars (G) and (H) As shown in FIG. 6 (the notations of B and C in this figure are replaced with G and H), the cutting 14 of pillars (G) and (H) is This is performed between the leg and the lifting force receiving member 3. The cutting 14 is desirably performed immediately before collapse. (2i) Jack-up of pillars (G) and (H) The collapse work is performed through the above steps, and the pillar (G) is pushed through the push-up force receiving member 3 by the action of the jack 5 shown in FIG. , (H) is pushed up and the pushing force from the support ring (,) shown in FIG. 1 to the tubular body (I) is transmitted, whereby the flange 8 of the reinforcing member 6 of the tubular body (I) shown in FIG.
With the fulcrum as a fulcrum, the entire body collapses in a predetermined direction X1 with good directivity.

[0026]

As described above, according to the present invention, a chimney structure supported by three pillars or four pillars can be safely, economically and quickly collapsed in a short construction period, and can be collapsed with good directionality. A new collapse direction can be selected for the limited collapse direction of the chimney structure supported by the pillar.

[Brief description of the drawings]

FIG. 1 is an elevation view of a chimney supported by three pillars.

FIG. 2 is a plan view showing a collapse direction of a chimney supported by three pillars.

FIG. 3 is an elevation view showing a balance structure.

FIG. 4 is a sectional view of a support ring installation position of FIG.

FIG. 5 is an explanatory view of an implementation state of the method of the present invention.

FIG. 6 is an elevation view showing reinforcement and cutting of columns (B) and (C).

FIGS. 7A and 7B are elevation views showing reinforcement and cutouts of a tubular body (D), wherein FIG. 7A is a direction of a collapse axis, and FIG.

FIG. 8 is a plan view showing reinforcement and notches of the tubular body (D).

FIG. 9 is an elevation view of a chimney supported by four pillars.

FIG. 10 is a plan view showing the collapse direction of a chimney supported by four pillars.

[Explanation of symbols]

(A), (B), (C), (E), (F), (G),
(H) Pillar (D), (I) Cylindrical body, ..., support ring installation position and support ring 1 ... diagonal member 2 ... steel plate 3 ... push-up force receiving member 4, 10 ... foundation concrete 5 ... jack 6 ... tubular body reinforcement 7 ... base plate 8 ... flange 9 ... steady rest member 11, 14 ... cutting 12 ... notch 13 ... removal.

Claims (2)

[Claims] In a chimney structure supported by three pillars, a connecting member for integrating a cylindrical body and three pillars is joined to form a balance structure, and a lower part of one pillar in a collapse direction. Is removed, the cylindrical body is cut off and the collapsible shaft is reinforced. In any procedure, the remaining two pillars are cut and lifted, and the lower part is pivoted on the cylindrical body serving as the fulcrum of the collapse. Collapse of the chimney structure supported by three pillars, comprising collapsed in the direction of the removed pillar. 2. A chimney structure supported by four pillars, wherein a connecting member for integrating the cylindrical body and the four pillars is joined to form a balance structure, and a quadrangular collapsed side in a plan view. Remove the lower part of the two pillars at both ends of one side perpendicular to the direction, cut the tubular body and reinforce the collapsible shaft in any procedure, cut the remaining two pillars Lifting and collapsing in the direction perpendicular to one side connecting the two pillars with the lower part removed, with the cylinder body serving as the fulcrum of the collapse as an axis,
A collapse method for a chimney structure supported by four pillars.