JP6859414B1 - How to install the chimney unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a chimney, an interval as a useful clearance between a lower chimney unit and an upper chimney unit to absorb vertical expansion and contraction of the chimney and improve seismic resistance of the chimney. To secure. SOLUTION: A connection step P1 for connecting an upper chimney unit 10 to a lower chimney unit 10 in a stacked manner and an attachment for attaching an upper chimney unit 10 connected to a lower chimney unit 10 in a suspended manner to a slab 72. It has a step P2. The connection step P1 includes the first operation S1 for inserting the insertion portion 34 of the upper chimney unit 10 into the sheath cylinder 33 of the lower chimney unit 10, the upper end surface 11 of the lower chimney unit 10, and the lower side of the upper chimney unit 10. Includes a second operation S2 that determines the mounting height position of the upper chimney unit 10 that can maintain a gap C between it and the end surface 12. [Selection diagram] Fig. 5

Description

In the present invention, the upper chimney unit connected to the lower chimney unit in the chimney constructed by connecting a plurality of tubular chimney units in a stacking manner in the chimney space inside the building skeleton is a slab of the skeleton. The present invention relates to a method of mounting a chimney unit that is suspended from the ground.

The chimneys constructed in the chimney space with openings provided in the slabs (floors) on each floor of the building frame are built by connecting multiple chimney units with a length of about 6 m in a stack from the bottom. Rarely, each chimney unit is hung from the slab. In this type of chimney, gas turbines, diesel engines, boilers, and exhaust gas ducts of waste incinerators installed in the building are connected to the lower end, and the upper end protrudes to the roof of the building.

Prior examples disclose a mounting structure for this type of chimney (see, for example, Patent Document 1). FIG. 8 is a side view showing the mounting structure of the chimney disclosed by Patent Document 1, and FIG. 9 is a plan view showing the mounting structure.

In the chimney mounting structure as a precedent example shown in FIGS. 8 and 9, the square tubular chimney unit 1 constituting the chimney is arranged at each of the four protruding corners of the square tubular heat insulating layer 5. It is provided with a framework 2 formed by a vertically long corner member 3 ... and a plurality of rectangular frame-shaped horizontal members 4 ... connecting these vertically long corner members 3 ... at a plurality of positions spaced apart from each other. Then, the chimney unit 1 provided in the atrium S as the chimney space provided in the building skeleton 6 is attached to the building skeleton 6 in a suspended shape at a plurality of places via the side holding portion 7. In this precedent example, the side holding portion 7 includes an arm 8 joined to a corner member 3 or a horizontal member 4 forming the frame 2 of the chimney unit 1 by welding, bolting, or the like. There is a description that the arm 8 is connected to the support base 9 installed on the building frame 6.

Other precedents also disclose a chimney constructed by connecting chimney units in the vertical direction (see, for example, Patent Document 2).

Japanese Patent No. 5798676 Japanese Patent Application No. 2017-237262

By the way, in a chimney that is constructed in the chimney space of the building frame, a certain distance (clearance) is secured between the lower chimney unit and the upper chimney unit that are connected in the vertical direction, and the air is exhausted by this distance. It is said that it is beneficial to absorb the vertical expansion and contraction of the chimney due to the temperature of the gas and to improve the earthquake resistance of the chimney. This applies not only to chimneys using a square tubular chimney unit, but also to chimneys constructed by connecting cylindrical chimney units in a vertically stacked manner.
However, in Patent Document 1 and Patent Document 2, it is useful to secure a certain distance between the lower chimney unit and the upper chimney unit and to secure such a gap. I can't see the description about.

Therefore, in constructing a tubular chimney including a square cylinder or a cylinder, the present invention expands and contracts the chimney in the vertical direction depending on the temperature of the exhaust gas between the lower chimney unit and the upper chimney unit. It is an object of the present invention to provide a chimney unit mounting method capable of ensuring an interval as a useful clearance for absorption and improvement of the earthquake resistance of the chimney. Another object of the present invention is to provide a chimney unit mounting method capable of easily and accurately securing such an interval.

In the chimney unit mounting method according to the present invention, the upper chimney connected to the lower chimney unit in the chimney constructed by connecting a plurality of tubular chimney units in a stack in the chimney space inside the building frame. The unit is suspended from the slab of the skeleton. Then, a connection step of connecting the upper chimney unit to the lower chimney unit in a stacked manner and an attachment in which the upper chimney unit connected to the lower chimney unit in this connection step is attached to the slab of the skeleton in a suspended manner. The first operation is the first operation of inserting the tubular insertion portion provided at the lower end portion of the upper chimney unit into the sheath cylinder provided at the upper end portion of the lower chimney unit. It includes a second operation of determining the mounting height position of the upper chimney unit that can maintain a distance between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit . Then, in the second operation included in the connection step, the second flange provided at the lower end of the upper chimney unit is attached to the bolt and nut with respect to the first flange provided at the upper end of the lower chimney unit. By positioning in the height direction using and, the mounting height position of the upper chimney unit that can maintain the above distance between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit is determined. The long bolt that is fixed to the second flange of the upper chimney unit and extends downward is provided in the first flange of the lower chimney unit through the first operation. By abutting the nut screwed into the long bolt in advance with the first flange of the lower chimney unit, the upper chimney unit has the upper chimney unit with respect to the first flange of the lower chimney unit. The second flange is positioned in the height direction to determine the mounting height position of the upper chimney unit that can maintain the above distance between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit. Is.

According to this chimney unit mounting method, the upper chimney unit connected to the lower chimney unit is attached to the slab of the skeleton in a suspended manner. The mounting height of the upper chimney unit that can maintain a distance between the first operation of inserting the insertion part of the upper chimney unit into the sheath tube and the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit. Since the second operation to determine the position is performed, by attaching the upper chimney unit to the slab of the skeleton in a hanging manner in the installation process, the clearance between the lower chimney unit and the upper chimney unit can be used. The interval will be secured. Therefore, the interval absorbs the vertical expansion and contraction of the chimney due to the temperature of the exhaust gas and improves the seismic resistance of the chimney. Further, as a means for determining the mounting height position of the upper chimney unit capable of maintaining the above interval, a long bolt fixed to the second flange of the upper chimney unit and extending downward and screwed in advance into the above-mentioned bolt. By bringing the nut into contact with the first flange of the lower chimney unit using the nut, the lower end of the upper chimney unit with respect to the first flange provided at the upper end of the lower chimney unit. Since the second flange provided on the bolt is positioned in the height direction, the screwing position of the nut with respect to the bolt can be adjusted to accurately determine the above interval.

In the chimney unit mounting method according to the present invention, a heat-resistant compressible packing laminated on the upper end surface of the lower chimney unit is attached to the upper chimney unit through the first operation and the second operation included in the above connection step. By pressing on the lower end surface to compress within the range that does not reach the compression limit range, this packing is sandwiched between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit. Can be done. According to this, the packing sandwiched between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit helps prevent the leakage of exhaust gas at the connection point of the chimney unit. Nevertheless, since the packing is only compressed in a range that does not reach the compression limit region, not only is the lower or upper chimney unit allowed to extend in the vertical direction, but also the lower side. Alternatively, even if the upper chimney unit contracts in the vertical direction, the airtightness of the exhaust gas is not impaired. In addition, seismic resistance is not impaired. The "compression limit of the packing" is the state in which the packing is compressed to the maximum extent, and the "range that does not reach the compression limit range" is the range in which the compression allowance remains in the compressed packing. That is.

In the chimney unit mounting method according to the present invention, it is desirable to adopt a configuration in which the upper chimney unit is suspended from the slab of the skeleton in the mounting step, and then the bolt and the nut are removed. .. After the upper chimney unit is suspended from the slab of the skeleton in the mounting process, the bolts and nuts are not required. Therefore, as the final work of the chimney unit mounting method according to the present invention, the bolts and nuts are used. It is desirable to remove the.

As described above, according to the method of attaching the chimney unit according to the present invention, when constructing a tubular chimney including a square cylinder or a cylinder, exhaust is exhausted between the lower chimney unit and the upper chimney unit. It is possible to secure an interval as a useful clearance for absorbing the vertical expansion and contraction of the chimney due to the temperature of the gas and improving the earthquake resistance of the chimney, and such an interval can be easily provided. Moreover, the effect that it can be secured with high accuracy is achieved.

It is a schematic inclination illustrated by partially breaking a chimney constructed by applying the chimney unit mounting method according to the present invention. It is a cross-sectional plan view which showed the main part of the chimney in an enlarged manner. It is the schematic perspective view which showed the state of the chimney unit of the lower stage side and the upper stage side in the stage before the connection process explanatoryly. It is an enlarged cross-sectional view of the main part in the state of FIG. It is the schematic perspective view which showed the state in the mounting process explanatoryly. FIG. 5 is an enlarged cross-sectional view of a main part in the state of FIG. It is explanatory drawing which showed the work procedure for carrying out the chimney unit mounting method in chronological order. It is a side view which showed the mounting structure of the chimney by the prior example. It is a top view which showed the mounting structure of the chimney of FIG.

Prior to explaining the chimney unit mounting method according to the present invention, the mounting structure of the chimney mounted on the building frame by applying the mounting method will be described, and then the chimney unit mounting method according to the embodiment of the present invention will be described. explain.
FIG. 1 is a schematic perspective view illustrating a partially broken chimney 100 constructed by applying the chimney unit mounting method according to the present invention, and FIG. 2 is a cross-sectional plan view showing an enlarged main part of the chimney 100. Is.

As shown in FIG. 1, the chimney 100 is divided into a plurality of chimney units 10 ..., And each chimney unit 10 includes a tubular heat insulating layer 20, a steel plate outer cylinder 30 surrounding the heat insulating layer 20, and the like. It includes an inner cylinder 50 made of a steel plate arranged on the inner surface side of the heat insulating layer 20. In the illustrated example, the chimney unit 10 is formed in a square cylinder shape. As shown in FIG. 1 or 2, the outer cylinder 30 is formed by connecting a plurality of ear edges 31 formed by overlapping portions of four plate bodies by using a stopper 32 made of bolts and nuts. Has been done. The upper end and the lower end of the outer cylinder 30 are provided with a notched portion of the ear edge 31, and a first flange 61 and a second flange 65 made of L-shaped steel are provided for each of the above-mentioned plates at the notched portion. It is provided in. These first flange 61 and second flange 65 also serve as a reinforcing material for suppressing bending deformation of the outer cylinder 30.

As shown in FIG. 1, a square tubular sheath tube 33 as a female connecting portion joined by welding is continuously provided at the upper end of the outer tube 30. On the other hand, the lower end portion of the outer cylinder 30 is formed as a tubular insertion portion 34 as a male connection portion having a constant length extending downward from the attachment portion of the second flange 65.

The chimney 100 is constructed by connecting the chimney units 10 having the required number of stages described with reference to FIGS. 1 and 2 in a vertically stacked manner. Then, the chimney unit 10 which is a component of the constructed chimney 100 is attached to the building frame 70 in a suspended manner.

The chimney 100 is arranged in the chimney space 71 provided in the building frame 70. Then, a gas turbine, a diesel engine, a boiler, and an exhaust gas duct of a waste incinerator installed in the building are connected to the lower end (not shown) of the chimney 100, and the upper end (not shown) is on the roof of the building. Be projected. Further, as shown in FIG. 1, at the connection point between the chimney units 10 and 10, the insertion portion 34 of the upper chimney unit 10 is inserted into the sheath cylinder 33 of the lower chimney unit 10.

As shown in FIG. 1 or 2, the upper chimney unit 10 is attached to the slab (floor) 72 of the building frame 70 in a suspended manner via the support hardware 80. The support hardware 80 is a pair of rising plate portions 81, 81 provided on both sides of the outer cylinder 30 of the chimney unit 10 and sandwiching the respective ear edges 31, and these rising plate portions 81, 81. It has seat plate portions 82, 82 connected to each lower end in a bent shape at a right angle. Then, the ear edge 31 and the support hardware 80 are connected by a coupling tool 83 consisting of a bolt and a nut. Further, a fixed metal fitting 73 embedded in advance at the time of placing the slab 72 is exposed on the building frame 70, and the supporting metal fitting 80 is joined to the fixed metal fitting 73 by welding means. In addition to welding, a bolt protruding from the fixed metal fitting 73 is passed through a hole provided in the seat plate portion 82 of the supporting metal fitting 80 as a means for connecting the supporting metal fitting 80 and the fixed metal fitting 73. A means of screwing a nut into a bolt penetrating the hole may be used.

Next, a method of attaching the chimney unit according to the embodiment will be described.
FIG. 7 is an explanatory diagram showing the work procedure for carrying out the chimney unit mounting method in chronological order. As shown in the figure, the chimney unit mounting method according to the embodiment includes a connection step P1 for connecting the upper chimney unit 10 to the lower chimney unit 10 shown in FIG. It has an attachment step P2 in which the upper chimney unit 10 connected to the lower chimney unit 10 in P1 is attached to the slab 72 of the building frame 70 shown in FIG. 1 or 2 in a suspended manner. Then, the connection step P1 includes the first operation S1 for inserting the tubular insertion portion 34 of the upper chimney unit 10 into the sheath cylinder 33 of the lower chimney unit 10, and the upper end surface and upper chimney of the lower chimney unit 10. It includes a second operation S2 that determines the mounting height position of the upper chimney unit 10 that can maintain a gap C (described later) between the unit 10 and the lower end surface. Hereinafter, a specific description will be given.

FIG. 3 is a schematic perspective view illustrating the state of the lower chimney unit 10 and the upper chimney unit 10 in the previous stage of the connection step P1, and FIG. 4 is an enlarged cross-sectional view of a main part in the same state. .. Further, FIG. 5 is a schematic perspective view explanatoryly showing the state in the mounting step P2, and FIG. 6 is an enlarged cross-sectional view of a main part in the same state.

As shown in FIGS. 4 and 6, a packing 90 made of heat-resistant compressible glass wool is superposed on the upper end surface 11 of the lower chimney unit 10, and a caulking material is formed in the gap between the packing 90 and the sheath tube 33. 91 is loaded. Further, the L-shaped steel used for the first flange 61 of the lower chimney unit 10 and the L-shaped steel used for the second flange 65 of the upper chimney unit 10 have different thickness dimensions, and the thickness dimension is different. After making the 1st flange 61 thicker than the 2nd flange 65, the sheath cylinder 33 is joined to the outer surface of the 1st flange 61. Therefore, when the insertion portion 34 is inserted into the sheath cylinder 33, a gap 35 is formed between the sheath cylinder 33 and the insertion portion 34 as shown in FIG. The gap 35 has a size capable of absorbing the horizontal displacement difference between the floors on the upper and lower floors due to the inter-story displacement of the building frame 70 that occurs at the time of an earthquake or the like. The second flange 65 of the upper chimney unit 10 is configured to cover the upper part of the gap 35, thereby suppressing rainwater or the like from entering the gap 35.

Further, the second flange 65 is provided with a fixing hole 201 used for fixing a long bolt 200, which will be described later, and the first flange 65 is provided with a bolt insertion hole 202 into which the bolt 200 can be inserted. It is equipped. As can be inferred from FIG. 3, the fixing hole 201 and the bolt insertion hole 202 are provided at the positions where the second flange 65 and the first flange 61 face each other in the vertical direction, and the second flange 65 and the second flange 61 are located. It is provided at each of a plurality of locations of one flange 61. Then, as shown in FIGS. 3 and 4, the upper end portion of the long bolt 200 made of a headless bolt is fixed to the second flange 65 by using the fixing hole portion 201 of the second flange 65. There is. Specifically, as shown in FIG. 4, the second flange 65 is tightened with two nuts 203 and 204 screwed into the upper end of the long bolt 200 inserted through the fixing hole 201 to form a long bolt. The upper end of the bolt 200 is fixed to the second flange 65.

The connection step P1 shown in FIG. 7 is a step of connecting the upper chimney unit 10 to the lower chimney unit 10 in a stacked manner. In this connection step P1, the first operation S1 for inserting the tubular insertion portion 34 of the upper chimney unit 10 into the sheath cylinder 33 of the lower chimney unit 10 and the lower chimney unit 10 as shown by an arrow X in FIG. 4 are performed. Includes a second operation S2 that determines the mounting height position of the upper chimney unit 10 capable of holding a constant interval C shown in FIG. 6 between the upper end surface 11 of the 10 and the lower end surface of the upper chimney unit 10. ..

In this embodiment, a long bolt 200 fixed to the second flange 65 and extending downward helps determine the mounting height position of the upper chimney unit 10 capable of holding the interval C. That is, in the second operation S2, the long bolt 200 is inserted into the bolt insertion hole 202 provided in the first flange 61 of the lower chimney unit 10 through the first operation S1 and has the same length. The nut 205, which has been screwed into the bolt 200 of the scale in advance, is brought into contact with the first flange 61 of the lower chimney unit 10 as shown in FIGS. 5 and 6. By doing so, the second flange 65 is positioned in the height direction with respect to the first flange 61, and the distance C between the upper end surface 11 of the lower chimney unit 10 and the lower end surface 12 of the upper chimney unit 10. The mounting height position of the upper chimney unit 10 that can hold the chimney unit 10 is determined.

Here, the distance C to be held between the upper end surface 11 of the lower chimney unit 10 and the lower end surface 12 of the upper chimney unit 10 is the lower side from the upper surface of the first flange 61 as shown in FIG. The nut 205 screwed into the lower surface of the second flange 65 and the proper screwing position with the total dimension of the protruding width L1 of the chimney unit 10 and the protruding width L2 of the upper stage side chimney unit 10 from the lower surface of the second flange 65. It is the dimension subtracted from the mutual length A with the lower surface of the. That is, the interval C is
C = A- (L1 + L2) …… (1)
Can be represented by. Therefore,
A = C + (L1 + L2) …… (2)
Is.

As a result, if the screwing position of the nut 205 into the long bolt 200 is determined so as to satisfy the above equation (2), the nut 205 screwed into the long bolt 200 in advance as described above can be used. By abutting the first flange 61, the interval C can be held between the upper end surface 11 of the lower chimney unit 10 and the lower end surface 12 of the upper chimney unit 10.

In this embodiment, as shown in FIG. 6, the packing 90 is brought into the compression limit region by pressing the packing 90 on the lower end surface 12 of the upper chimney unit 10 through the first operation S1 and the second operation S2 described above. It is compressed within the range that cannot be reached. The "compression limit of the packing 90" is the state in which the packing 90 is compressed to the maximum extent, and the "range that does not reach the compression limit range" is the range in which the compression allowance remains in the compressed packing 90. That is. The thickness T of the packing 90 in the uncompressed natural state as shown by the virtual line in FIG. 6 is about 5 to 20 mm depending on the size of the chimney unit 10. When a packing 90 having a thickness T of this degree is adopted, the compression width t by pressing the packing 90 with the lower end surface 12 of the upper chimney unit 10 is set to about 2 mm, so that the packing 90 having a thickness T of 5 mm is adopted. If this is the case, it is desirable to set the spacing C to about 3 mm, and if the packing 90 has a thickness T of 20 mm, it is desirable to set the spacing C to about 18 mm. As a result, the range of the appropriate dimension of the interval C becomes 3 to 18 mm, and if the interval C in this range is maintained, the vertical expansion and contraction of the chimney due to the temperature of the exhaust gas is reasonably absorbed, and the chimney It is known that seismic resistance is also improved. Further, the thickness T1 of the packing 90 compressed by pressing the packing 90 on the lower end surface 12 of the upper chimney unit 10 naturally has the same dimensions as the interval C, and the packing 90 in this state has the same dimensions. Since the chimney units 10 and 10 on the lower or upper side are not only allowed to extend in the vertical direction, but also on the lower side or the upper side, because they are only compressed in a range that does not reach the above-mentioned compression limit region. Even if the chimney units 10 and 10 of the above are contracted in the vertical direction, the airtightness of the exhaust gas is not impaired. In addition, seismic resistance is not impaired.

As shown in FIG. 7, after the upper chimney unit 10 is connected to the lower chimney unit 10 in a stacked manner by going through the connection step P1 described above, the upper chimney unit 10 is connected to the slab 72 of the building frame 70. The mounting step P2 is performed to attach the chimney in a suspended manner. In this mounting step P2, as shown in FIG. 5 or 6, the upper chimney unit 10 positioned at a height position capable of holding the interval C (see FIG. 6) is placed via the support metal fitting 80. , Attached to the fixed hardware 73 embedded in the slab 72 in a suspended manner. In this attachment work, as shown in FIG. 5, the support metal fitting 80 is connected to the ear edge 31 of the upper chimney unit 10 by using the bolt 32a and the nut 32b as the stopper 32, and then the support metal fitting 80 is fixed to the fixing metal fitting 73. It is done by binding to. When the mounting step P2 is performed, the upper chimney unit 10 is mounted on the slab 72 in a suspended manner. Therefore, the long bolts 200, the fixing nuts 203 and 204, and the nuts 205 screwed into the bolts 200 are removed. I will finish that role, so I will remove it afterwards.

In the embodiment described above, the upper chimney unit 10 that can maintain a constant interval C shown in FIG. 6 is attached between the upper end surface 11 of the lower chimney unit 10 and the lower end surface 12 of the upper chimney unit 10. In the second operation S2 of determining the height position, a long bolt 200 made of a headless bolt fixed to the second flange 65 of the upper chimney unit 10 and extending downward is used, and the long bolt 200 is used. The upper end of the chimney is fixed to the second flange 65 with two nuts 203 and 204. Therefore, it is possible to adjust the position of the long bolt 200 in the vertical direction by loosening or tightening the two nuts 203 and 204. Therefore, it is possible to finely adjust the height position of the nut 205 that comes into contact with the first flange 61 of the lower chimney unit 10 through the vertical position adjustment of the long bolt 200. Easy to improve dimensional accuracy. It is also possible to improve the dimensional accuracy of the interval C described above by finely adjusting the screwing position of the nut 205.

Further, in the above-described embodiment, the chimney unit 10 is formed in a square cylinder shape, but the chimney unit may be formed in a cylindrical shape. In that case, the chimney unit 10 is formed as a circle as the first flange or the second flange. An annular flange or an arc-shaped flange formed by dividing an arc-shaped flange into two in the circumferential direction is fixed to a cylindrical chimney unit by welding or the like.

In FIGS. 1 to 6, the same or corresponding elements are designated by the same reference numerals for the purpose of simplifying the description.

C Interval P1 Connection process P2 Installation process S1 1st operation S2 1st operation 10 Chimney unit 11 Upper end surface of lower chimney unit 12 Lower end surface of upper chimney unit 33 Sheath tube 34 Insertion part 61 1st flange 65 2nd flange 70 Building frame 71 Chimney space 72 Slab 90 Packing 100 Chimney 200 Bolt 202 Bolt insertion hole 205 Nut

Claims (3)

The upper chimney unit connected to the lower chimney unit in the chimney constructed by connecting a plurality of tubular chimney units in a stack in the chimney space inside the building skeleton is suspended from the slab of the skeleton. It is a chimney unit mounting method that can be mounted in a shape.
A connection process in which the upper chimney unit is connected to the lower chimney unit in a stacked manner, and an attachment process in which the upper chimney unit connected to the lower chimney unit in this connection process is attached to the slab of the skeleton in a suspended manner. Have,
The connection process involves the first operation of inserting the tubular insertion portion provided at the lower end of the upper chimney unit into the sheath cylinder provided at the upper end of the lower chimney unit, and the upper end surface of the lower chimney unit. look including a second operation for defining the mounting height position of the upper side stack unit capable of retaining the spacing between the upper side the lower end face of the chimney unit,
In the second operation included in the connection step, the bolts and nuts are attached to the second flange provided at the lower end of the upper chimney unit with respect to the first flange provided at the upper end of the lower chimney unit. By positioning in the height direction using the above, the mounting height position of the upper chimney unit that can maintain the above distance between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit is determined. hand,
The long bolt fixed to the second flange of the upper chimney unit and extending downward is inserted into the bolt insertion hole provided in the first flange of the lower chimney unit through the first operation. By bringing the nut screwed into the long bolt in advance to the first flange of the lower chimney unit, the second flange of the upper chimney unit is brought into contact with the first flange of the lower chimney unit. A chimney unit characterized in that the mounting height position of the upper chimney unit capable of maintaining the above distance between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit by positioning in the height direction is determined. Mounting method. The compression limit region is obtained by pressing the heat-resistant compressible packing superposed on the upper end surface of the lower chimney unit on the lower end surface of the upper chimney unit through the first and second operations included in the connection step. The chimney unit mounting method according to claim 1, wherein the packing is sandwiched between the upper end surface of the lower chimney unit and the lower end surface of the upper chimney unit by compressing the packing in a range not reaching. The chimney unit mounting method according to claim 1 or 2, wherein the upper chimney unit is suspended from the slab of the skeleton in the mounting step, and then the bolt and the nut are removed.

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