JP7449837B2 - Building chimney joint structure - Google Patents

Description

The present invention relates to a chimney installed in a building such as a high-rise building, and more particularly to a joint structure for connecting vertically stacked cylindrical chimney units such that they can be relatively displaced.

Generally, buildings containing boilers, generators, etc. are equipped with chimneys for releasing exhaust gas. Typically, this type of chimney includes a plurality of cylindrical chimney units (see Patent Document 1, etc.). These chimney units are stacked vertically in a row. In order to follow deformation during an earthquake, relative displacement (interstory displacement) between vertically adjacent chimney units is allowed. A joint packing is sandwiched between these upper and lower chimney units. The joint packing ensures airtightness between the chimney units. For example, the packing disclosed in Patent Document 1 is made of inorganic fibers that have fire resistance and elasticity.

Publication No. 63-050583

In this type of chimney, even if the upper and lower chimney units are displaced from each other due to an earthquake or the like, it is necessary to ensure airtightness between these chimney units. Therefore, an overhang is provided that extends horizontally outward from the upper end of the lower chimney unit, and the joint packing is formed into a wide mat that extends from the upper end of the lower chimney unit to near the tip of the overhang. This may allow the upper chimney unit to slide on the joint packing in the event of an earthquake. However, according to the inventor's findings, in reality, the upper surface of the joint packing on the side where the upper chimney unit is about to shift is turned over and becomes uneven, and the upper chimney unit does not move smoothly. It didn't slip.
In view of such circumstances, the present invention has been made to allow smooth relative displacement of the chimney units in the event of an earthquake in a chimney in which a joint packing is sandwiched between the upper and lower chimney units, and to ensure airtightness between the chimney units. The purpose is to ensure sex.

In order to solve the above problems, the present invention provides a chimney provided between a cylindrical first chimney unit in a chimney attached to a building and a cylindrical second chimney unit directly below the first chimney unit, A joint structure for a building chimney that allows relative horizontal displacement between these chimney units,
a mat-shaped joint packing provided in an annular joint space between the lower end surface of the first chimney unit and the upper end surface of the second chimney unit;
an overhang that is provided at the upper end of the second chimney unit so as to project outward horizontally, and whose upper surface is flush with the upper end surface of the second chimney unit;
a hanging plate that protrudes downward from the lower end of the outer peripheral surface of the first chimney unit and faces the outer peripheral surface of the upper side of the joint packing;
A gap is formed between the lower end of the hanging plate and the second chimney unit to allow the lower side of the joint packing to bulge, and the projecting base is connected to the lower side of the joint packing. It is characterized by being more protruding.

In the joint structure of the building chimney, the bulge or overhang of the joint packing onto the overhang can be sufficiently reduced. For this reason, when the first chimney unit on the upper side tries to shift laterally in the direction in which the overhanging platform extends with respect to the second chimney unit on the lower side due to interstory deformation due to an earthquake, it is possible to suppress or prevent the joint packing from turning over, 1 The chimney unit can slide sideways smoothly. Furthermore, the joint packing can be shifted onto the overhang together with the first chimney unit. On the side where the first chimney unit is about to retract relative to the second chimney unit, the upper part of the joint packing is caught on the hanging plate and pushed, so that the joint packing is retracted together with the first chimney unit. This makes it possible to allow relative displacement of the upper and lower chimney units to follow interlayer deformation, and to ensure airtightness between these chimney units.

The joint packing has a blanket-like flexible heat insulating material and a heat insulating bag, the heat insulating material has a closed annular shape covering the entire circumference of the joint space, and the bag has a It is preferable to have an annular shape that envelops the material.
Thereby, it is possible to reliably suppress or prevent the joint packing from turning over when the first chimney unit shifts laterally due to an earthquake. In addition, insulation and airtightness between the chimney units can be ensured.

It is preferable that a cross section of the joint packing perpendicular to the chimney circumferential direction in an uncompressed state has a substantially rectangular shape. The uncompressed state refers to a state in which the joint packing is not receiving compressive force from the first chimney unit and the second chimney unit. Thereby, it is possible to reliably suppress the joint packing from turning over, and it is possible to reliably allow smooth relative displacement between the chimney units. Moreover, according to the inventor's findings, wear and tear at the corners of the joint packing can be suppressed. Incidentally, if the cross section of the joint packing perpendicular to the circumferential direction of the chimney in an uncompressed state is circular, the damage to the joint packing is particularly large at the corner where two side surfaces of the chimney intersect.

According to the present invention, in a chimney in which a joint packing is sandwiched between upper and lower chimney units, smooth relative displacement of the chimney units is allowed in the event of an earthquake, and airtightness between the chimney units is ensured. can do.

FIG. 1 is an explanatory front view of a high-rise portion of a building including a chimney according to an embodiment of the present invention. FIG. 2 is a plan sectional view of the chimney joint taken along line II-II in FIG. FIG. 3 is a front cross-sectional view of the joint taken along line III--III in FIG. 2. FIG. 4 is a sectional view of a portion of the joint packing in the circumferential direction shown in FIG. 3 in a non-bulging state (default state). FIG. 5 is a perspective view of the joint packing. FIG. 6 is a front sectional view showing one aspect of the relative displacement of the chimney units of the joint during an earthquake. FIG. 7 is a front cross-sectional view showing another example of the relative displacement of the chimney units of the joint during an earthquake.

FIG. 1 shows a building 1 such as a high-rise building. A chimney 3 is attached to the building 1 for releasing exhaust smoke from a boiler, a generator, etc. The flue of the chimney 3 of this embodiment, and thus the axial direction of the chimney, are bent. That is, the chimney 3 includes a vertical chimney part 3a extending vertically from the low-rise part of the building 1 to the rooftop floor 1ph, a horizontal part 3b extending horizontally at the rooftop floor 1ph, a rising part 3c rising from the horizontal part 3b, and a rising part 3c. It has a chimney opening 3d at the top of the chimney.

As shown in FIG. 1, the chimney 3 includes a plurality of chimney units 10 forming a flue and joints 14 and 20. As shown in FIG. 2, each chimney unit 10 has a cylindrical shape with a rectangular cross section, for example. As shown in FIG. 1, a flue is formed by connecting a plurality of chimney units 10 in the chimney axial direction. Adjacent chimney units 10 are connected to each other via a joint 14. The joint 14 is a bayonet joint that allows the upper and lower chimney units to lock together. Each chimney unit 10 of the vertical chimney portion 3a is supported by the frame 1a of the building 1 via a support bracket 13. Each chimney unit 10 in the horizontal section 3b of the rooftop floor 1ph is suspended and supported by a hanging frame 15.

As shown in FIG. 1, among the chimney units 10, the first chimney unit 11 at the upper end of the vertical chimney portion 3a is directly subjected to the displacement of the transverse portion 3b connected thereto. Therefore, instead of the joint 14, a sway joint that allows sway (relative displacement in the horizontal direction) between the chimney units 11 and 12 is installed between the first chimney unit 11 and the second chimney unit 12 directly below it. A joint 20 (joint structure) is interposed.

Specifically, as shown in FIG. 3, each chimney unit 10 including the first and second chimney units 11 and 12 has an inner heat insulating board 13 and an outer heat insulating board 14 stacked on each other. A step 13d is formed at the lower end of the first chimney unit 11 due to the height difference between the two heat insulation boards 13 and 14. A joint space 19 is formed by the step 13d, the lower end surface of the outer heat insulating board 14 of the first chimney unit 11, and the upper end surface of the second chimney unit 12. The joint space 19 has a rectangular ring shape extending around the entire circumference of the chimney 3 and is open to the outside and inside of the chimney 3. A joint 20 is arranged in the joint space 19.

As shown in FIG. 3, the joint 20 includes a joint packing 21, a frame member 30, and a pedestal 40. A joint packing 21 is provided in the square annular joint space 19. As shown in FIG. 2, the joint packing 21 is formed in a square ring shape that extends around the entire circumference of the joint space 19. That is, the joint packing 21 is not divided in the circumferential direction, but is integrated over the entire circumference of the joint space 19.

As shown in FIG. 3, the joint packing 21 has a mat shape that can be compressed and deformed. The joint packing 21 includes a blanket-like flexible heat insulating material 22 and a heat insulating bag 23. The heat insulating material 22 is formed in a rectangular closed ring shape (doughnut shape) extending all around the joint space 19 . Preferably, the material of the heat insulating material 22 is a ceramic blanket.

As shown in FIG. 5, the bag body 23 is formed in a square toroidal shape (torus shape). The bag 23 covers the entire surface of the heat insulating material 22. Preferably, the material of the bag body 23 is glass cloth. The bag body 23 may have an integral toroidal shape as a whole, and a seam (seam) may be formed by sewing together a plurality of pieces of heat insulating fabric such as glass cloth.

As shown in FIG. 4, the cross section of the joint packing 21 in an uncompressed state orthogonal to the circumferential direction of the chimney has a generally rectangular shape. The non-compressed state refers to a state in which the joint packing 21 is not receiving compressive force, which will be described later, by the first chimney unit 11 and the second chimney unit 12.

As shown in FIG. 3, a frame member 30 is installed at the lower end of the first chimney unit 11. The frame member 30 is made of a shaped steel material having a U-shaped cross section (C-shape) and having a web 31 and a pair of flanges 32 and 33. A web 31 is attached to and fixed to the lower end surface of the outer heat insulating board 14. A pair of flanges 32 and 33 face each other in the chimney interior and exterior directions. A flange 32 on the inside of the chimney is fixed against the step 13d.

The flange 33 on the outside of the chimney protrudes (hangs) downward from the lower end of the outer peripheral surface of the first chimney unit 11 . Hereinafter, the flange 33 will be appropriately referred to as a "hanging plate 33." The hanging plate 33 projects slightly outward from the outer peripheral surface of the first chimney unit 11, but is not limited to this, and may be flush with the outer peripheral surface of the first chimney unit 11. It may be slightly recessed from the outer peripheral surface of 11.

As shown in FIG. 3, the lower end portion of the hanging plate 33 is arranged at the middle portion of the joint space 19 in the height direction. A gap 19b is formed between the lower end of the hanging plate 33 and the upper end surface of the second chimney unit 12 (specifically, the upper surface of the pedestal 40).
As shown in FIG. 2, the frame member 30 and, in turn, the hanging plate 33 have a square annular shape extending all around the chimney 3 having a square cross section.
As shown in FIGS. 2 and 3, a packing upper accommodation space 34 is defined inside the frame member 30 by the web 31 and the pair of flanges 33. The packing upper storage chamber 34 is open downward and has a square ring shape extending all around the chimney 3 having a square cross section.

As shown in FIG. 3, a pedestal 40 is provided at the upper end of the second chimney unit 12. The pedestal 40 integrally includes a pedestal portion 41 and a projecting base 42. The pedestal portion 41 has a flat plate shape and covers the upper end surfaces of the heat insulation boards 13 and 14 of the second chimney unit 12. The upper surface of the pedestal portion 41 constitutes the upper end surface of the second chimney unit 12.

A projecting stand 42 extends from the pedestal part 41 to the outside of the chimney. The projecting base 42 has a flat plate shape that is flush with and integral with the base portion 41. The projecting base 42 projects horizontally from the upper end of the second chimney unit 12 to the outside of the chimney. The upper surface of the projecting base 42 is flush with the upper surface of the pedestal portion 41 and, in turn, with the upper end surface of the second chimney unit 12.

As shown in FIG. 2, the pedestal 40, as well as the pedestal portion 41 and the overhanging pedestal 42, have a square annular shape extending all around the chimney 3 having a square cross section.

As shown in FIG. 3, the joint packing 21 is placed on the pedestal portion 41. As shown in FIG. A projecting stand 42 projects from the lower side of the joint packing 21. The joint packing 21 does not substantially have an overhang portion overhanging the overhang base 42.

The upper side part of the joint packing 21 is inserted between the flange 32 and the hanging plate 33 of the frame member 30, and is fitted into the packing upper accommodation chamber 34 of the frame member 30. The outer peripheral surface of the upper side of the joint packing 21 is pressed against the inner surface of the hanging plate 33. That is, the hanging plate 33 faces the outer circumferential surface of the upper side of the joint packing 21.

As shown in FIG. 3, the joint packing 21 is deformed by being sandwiched between the upper and lower chimney units 11 and 12 and compressed vertically. Specifically, the lower part of the joint packing 21 is bulged in the inner and outer directions of the chimney. In particular, the outer peripheral portion of the lower side of the joint packing 21 bulges out from the gap 19b onto the overhanging base 42. In other words, the gap 19b allows the lower portion of the joint packing 21 to bulge. The amount of bulge d ₂₁ of the outer peripheral portion of the lower side of the joint packing 21 is sufficiently smaller than the bulge width w 42 of the bulge ₄₂ . Preferably, the amount of bulge _d21 is less than a fraction of the width of bulge _w42 .

The vertical dimensions of the joint packing 21 are reduced by compression. The compression ratio a of the joint packing 21 is preferably about 65% to 85%, more preferably about 75%. This ensures airtightness.
Here, the compression ratio a refers to the ratio of the height h ₁ of the joint packing 21 in the compressed state (FIG. 3) to the height h ₀ of the joint packing 21 in the uncompressed state (FIG. 4) (a= h ₁ /h ₀ ).

As shown in FIG. 3, an outer peripheral connecting frame 50 is provided so as to straddle the outer peripheral surfaces of the upper and lower chimney units 11 and 12. The outer peripheral connection frame 50 includes a pair of upper and lower frame members 51 and 52 and a joint cover 53. The frame members 51 and 52 are each made of a steel material having a U-shaped cross section. The upper frame member 51 is installed near the lower end of the outer peripheral surface of the first chimney unit 11. The lower frame member 52 is installed near the upper end of the outer peripheral surface of the second chimney unit 12. The frame members 51 and 52 are vertically spaced apart from each other and face each other.

The upper surface of the lower frame member 52 is directed to the lower surface of the overhanging base 42. The overhanging base 42 is supported and reinforced by the frame member 52.

A joint cover 53 is spanned between the outer end surfaces of the upper and lower frame members 51 and 52 facing outside the chimney. An upper end portion of the joint cover 53 is fixed to the frame member 51. A lower end portion of the joint cover 53 is fixed to the frame member 52. The joint cover 53 is made of a flexible heat insulating sheet. Preferably, the material of the joint cover 53 is glass cloth. The joint cover 53 is loosened to accommodate relative displacement (interlayer deformation) between the chimney units 11 and 12.

As shown in FIG. 2, the outer connecting frame 50 including the joint cover 53 and the frame members 51 and 52 is provided in an annular shape over the entire circumference of the chimney 3. The joint 20 is covered over its entire circumference by a joint cover 53 from the outside of the chimney. The joint cover 53 prevents dust from entering into the joint 20.

In the building chimney 3, the joint packing 21 can ensure airtightness and heat insulation between the upper and lower chimney units 11 and 12.
As described above, the joint packing 21 does not substantially have a protruding portion onto the protruding base 42, and the amount of protrusion d21 (FIG. 3) is sufficiently small.
For this reason, as shown in FIG. 6, for example, due to earthquake shaking, the upper first chimney unit 11 shifts laterally relative to the lower second chimney unit 12 in the direction in which the overhang pedestal 42 extends (to the right in FIG. 6). When doing so, the joint packing 21 does not turn over. Therefore, the first chimney unit 11 can smoothly shift laterally. At this time, the joint packing 21 is pushed and moved by the flange 32 and by the step 13d, so that it can be shifted onto the overhanging base 42 together with the first chimney unit 11.

As shown in FIG. 7, when the first chimney unit 11 on the upper side is retracted from the second chimney unit 12 on the lower side, the upper part of the joint packing 21 is pushed and moved by the hanging plate 33, so that the joint packing 21 is retracted together with the first chimney unit 11.
Thereby, relative displacement between the upper and lower chimney units 11 and 12 can be tolerated, and interlayer deformation can be followed. In addition, regardless of the relative displacement of the chimney units 11 and 12, the joint packing 21 is interposed in a compressed state over the entire circumference between the chimney units 11 and 12, thereby ensuring airtightness between the chimney units 11 and 12. can ensure sex.

Since the heat insulating material 22 and the bag body 23 of the joint packing 21 are integrally formed into a rectangular ring shape that is not divided in the circumferential direction, it is possible to reliably suppress the turning of the joint packing 21 when the first chimney unit 11 shifts laterally.
Furthermore, since the cross section of the joint packing 21 in the uncompressed state is square, it is possible to reliably suppress the turning of the joint packing 21 and also to reliably suppress wear and tear of the joint packing 21 at the corner portion 21c of the joint packing 21.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
For example, the joint packing 21 may be divided into a plurality of parts in the circumferential direction of the joint space 19. The cross section of the joint packing 21 in the uncompressed state orthogonal to the chimney circumferential direction may be circular.

The present invention can be applied to chimneys installed in high-rise buildings, for example.

3 Chimney 11 First chimney unit 12 Second chimney unit 19 Joint space 19b Gap 20 Joint (joint structure)
21 Joint packing 21c Corner 22 Heat insulating material 23 Bag body 30 Frame member 33 Flange (hanging plate)
34 Packing upper storage chamber 40 Pedestal 41 Pedestal part 42 Overhanging base

Claims (3)

Provided between a cylindrical first chimney unit in a chimney attached to a building and a cylindrical second chimney unit directly below the first chimney unit, the chimney unit is provided to control horizontal relative displacement between these chimney units. An acceptable joint structure for a chimney for a building,
a mat-shaped joint packing provided in an annular joint space between the lower end surface of the first chimney unit and the upper end surface of the second chimney unit;
an overhang that is provided at the upper end of the second chimney unit so as to project outward horizontally, and whose upper surface is flush with the upper end surface of the second chimney unit;
a hanging plate that protrudes downward from the lower end of the outer peripheral surface of the first chimney unit and faces the outer peripheral surface of the upper side of the joint packing;
A gap is formed between the lower end of the hanging plate and the second chimney unit to allow the lower side of the joint packing to bulge, and the projecting base is arranged on the lower side of the joint packing. A joint structure for a building chimney that is characterized by a more protruding structure. The joint packing has a blanket-like flexible heat insulating material and a heat insulating bag, the heat insulating material has a closed annular shape covering the entire circumference of the joint space, and the bag has a 2. The joint structure for a chimney for a building according to claim 1, wherein the joint structure has an annular shape that envelops the material. The joint structure for a chimney for a building according to claim 1 or 2, wherein a cross section of the joint packing perpendicular to the circumferential direction of the chimney in a non-expanded state has a substantially rectangular shape.

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