Chimney and method for manufacturing a chimney

Abstract

The present invention provides a chimney that, even with fins, can be easily covered with an exterior component to conceal the outer surface of the main body. [Solution] The device comprises a columnar cylindrical body 10 having an axis extending in a predetermined direction, a plurality of plate-shaped fins 20 that protrude radially from the cylindrical body 10 with respect to the axis, and that spread radially and in a predetermined direction, and have thickness in the circumferential direction with respect to the axis, and an outer covering member 30 that covers the outer circumferential surface 10s of the cylindrical body 10, the outer covering member 30 having an insertion portion 30i through which each fin 20 is inserted in the radial direction.

Description

Technical Field

[0001] The present disclosure relates to chimneys and methods for manufacturing chimneys.

Background Art

[0002] Vibrations (vortex-induced vibrations due to Karman vortices) caused by the flow of fluids such as wind may occur in columnar structures such as chimneys, towers, and columns. In response to this, for example, in the conventional example of Patent Document 1, there is described a technique for suppressing the generation of Karman vortices by connecting a series of spiral fins to the outer peripheral surface of the chimney body. In addition, although it is used not in the air but in water, for example, Patent Document 2 describes a vortex-induced vibration suppression device provided with a plurality of movable fins arranged in a spiral shape on a cylindrical structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] A chimney may be provided with an exterior member that covers the outer peripheral surface of the chimney body (main body). This exterior member has functions such as covering a heat insulating material that covers the outer peripheral surface of the body and improving the appearance of the chimney. When covering the chimney body to which spiral fins as in Patent Document 1 are connected with an exterior member, due to the complex shape of the fins, there is a concern that the construction of the exterior member is difficult and the construction cost increases. In addition, when covering the chimney body provided with fins as in Patent Document 2 with an exterior member, since the fins are movable, it is necessary to devise the form of the exterior member, and there is a concern that the construction cost increases.

[0005] This disclosure has been made in view of these circumstances and aims to provide a chimney and a method for manufacturing a chimney in which the outer surface of the main body can be easily covered with an exterior component, even if fins are present. [Means for solving the problem]

[0006] To solve the above problems, the chimney and method for manufacturing the chimney described herein employ the following means.

[0007] A chimney according to one aspect of the present disclosure comprises a columnar body having an axis extending in a predetermined direction, a plurality of plate-shaped fins projecting radially from the body with respect to the axis and expanding in the radial and predetermined directions, and having thickness in the circumferential direction with respect to the axis, and an exterior member covering the outer surface of the body, wherein the exterior member has an insertion portion through which each of the fins is inserted in the radial direction.

[0008] A method for manufacturing a chimney according to one aspect of the present disclosure is a method for manufacturing a chimney as described above, wherein each fin is connected to the outer surface of the main body, and after each fin is connected to the outer surface of the main body, the outer surface of the main body is covered with the exterior member. [Effects of the Invention]

[0009] According to this disclosure, even if fins are present, the outer surface of the main body can be easily covered with an exterior component. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a chimney according to one embodiment of the present disclosure. [Figure 2] This is a partial perspective view of a chimney according to one embodiment of the present disclosure. [Figure 3] This is a portion of the cross-sectional view along the cutting line III-III shown in Figure 2. [Figure 4] This is a perspective view of the vicinity of the fins of a chimney according to one embodiment of the present disclosure. [Figure 5]It is a cross-sectional view taken along the cutting line V-V shown in FIG. 4. [Figure 6] It is a cross-sectional view taken along the cutting line VI-VI shown in FIG. 5. [Figure 7] It is a view showing a method for manufacturing a chimney according to an embodiment of the present disclosure. [Figure 8] It is a view showing a method for manufacturing a chimney according to an embodiment of the present disclosure. [Figure 9] It is a view showing a method for manufacturing a chimney according to an embodiment of the present disclosure. [Figure 10] It is an example of an insertion portion of an exterior member of a chimney according to an embodiment of the present disclosure. [Figure 11] It is another example of an insertion portion of an exterior member of a chimney according to an embodiment of the present disclosure. [Figure 12] It is a perspective view of a chimney according to an embodiment of the present disclosure in a divided state. [Figure 13] It is a plan view of FIG. 12. [Figure 14] It is a perspective view of a chimney according to an embodiment of the present disclosure in a divided state. [Figure 15] It is a plan view of FIG. 14. [Figure 16] It is a perspective view of the vicinity of fins of a chimney according to an embodiment of the present disclosure (including fin dividing portions). [Figure 17] It is a side view of the vicinity of fins of a chimney according to an embodiment of the present disclosure (including fin dividing portions). [Figure 18] It is a plan view of FIG. 17. [ [Figure 19] It is a view showing a method for manufacturing a chimney according to an embodiment of the present disclosure (including fin dividing portions). [Figure 20] It is a perspective view of the vicinity of fins of a chimney according to an embodiment of the present disclosure (including reinforcing tools).

MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, a chimney and a method for manufacturing the chimney according to an embodiment of the present disclosure will be described with reference to the drawings.

[0012] <About the basic structure of a chimney> As shown in Figures 1 to 4, the chimney 1 is a vertically extending structure and comprises a cylindrical body (main body) 10, a plurality of fins 20, an exterior member 30, a fastener 40, and an insulating material 50.

[0013] As shown in Figures 1 to 3, the cylindrical body 10 is a columnar (cylindrical) structure having an axis X extending in a predetermined direction. The predetermined direction, after the construction of chimney 1, is approximately coincident with the vertical direction.

[0014] Each fin 20 is a plate-shaped member that protrudes radially (radially with respect to the axis X) from the cylindrical body 10. Specifically, each fin 20 is a thin plate-shaped component that expands radially and in a predetermined direction and has thickness in the circumferential direction (circumferentially with respect to the axis X). As shown in Figures 3 to 5, each fin 20 is connected, for example, to the outer circumferential surface 10s of the cylindrical body 10. Specifically, the base edge 20e (the radially inward edge) of each fin 20 is joined to the outer circumferential surface 10s of the cylindrical body 10 by welding. However, the method of connection is not limited to welding. Each fin 20 has a predetermined shape and is arranged according to a predetermined rule. Details of the arrangement and shape of the fins 20 will be described later.

[0015] As shown in Figures 2 to 4, the exterior member 30 is a member that covers the outer circumferential surface 10s of the cylindrical body 10. That is, the exterior member 30 is a cylindrical member whose inner diameter is larger than the outer diameter of the cylindrical body 10. Furthermore, the exterior component 30 is a component that covers the insulation material 50 and also serves to improve the appearance of the chimney 1. As shown in Figures 3 and 4, the exterior member 30 has a protrusion (recess) extending in a predetermined direction. As shown in Figures 4 and 6, the exterior member 30 has an insertion portion 30i through which each fin 20 is inserted radially. As a result, each fin 20 that protrudes radially will protrude to the outside of the exterior member 30 through the insertion portion 30i of the exterior member 30.

[0016] The insertion portion 30i is formed to extend in a predetermined direction. The shape of the insertion portion 30i is, for example, compatible with the longitudinal cross-sectional shape of the fin 20 (the shape in a cross-section perpendicular to the radial direction).

[0017] As shown in Figures 4 and 5, the exterior member 30 is attached to the cylindrical body 10 by, for example, a fastener 40. The fastener 40 is a frame having multiple furring strips 41 and multiple vertical frames 42. Each purlin 41 is a component that extends along the circumference, following the shape of the outer surface 10s of the cylindrical body 10. The cross-sectional shape of each purlin 41 (the shape of the cross-section perpendicular to the extension direction) is, for example, an inverted L shape. However, the cross-sectional shape is not limited to this. Multiple purlins 41 are arranged at intervals in a predetermined direction. The vertical frame 42 is a component that extends along a predetermined direction. The vertical frame 42 connects adjacent furring strips 41 that are spaced apart in a predetermined direction. As a result, multiple furring strips 41 and multiple vertical frames 42 are integrated into one unit. The fastener 40 is attached to the cylindrical body 10 by, for example, fixing the rib 41 to the outer surface 10s of the cylindrical body 10. The exterior member 30 is attached to the fastener 40, for example, by screwing it to the furring strip 41 of the fastener 40. However, the method of attachment is not limited to this.

[0018] As described above, the base edge 20e of each fin 20 is joined to the outer circumferential surface 10s of the cylindrical body 10 by welding. At this time, a notch 20c is formed in the base edge 20e that conforms to the shape of the purlin 41 of the fixing device 40. This allows the base edge 20e to abut against the outer circumferential surface 10s of the cylindrical body 10 without the fin 20 interfering with the purlin 41. In addition to or instead of joining the outer circumferential surface 10s of the cylindrical body 10, each fin 20 may be joined to the casing 41.

[0019] As shown in Figures 2 and 3, the heat-insulating material 50 is provided between the cylindrical body 10 and the outer casing member 30 so as to cover the outer circumferential surface 10s of the cylindrical body 10. As described above, the insulation material 50 is covered by the exterior component 30. Therefore, it is not visible from the outside.

[0020] <Regarding the placement and shape of the fins> As shown in Figures 1 and 2, the multiple fins 20 are arranged in a spiral pattern with respect to the axis X. Specifically, the multiple fins 20 are arranged in a triple spiral pattern. That is, there are three fins 20 belonging to the same height position (same position in a predetermined direction / same position in the direction of axis X), and these three fins 20 are arranged at equal angular intervals. If we define the angle between adjacent fins 20 at the same height position (angle centered on axis X) as angle φ, then the angle φ shown in Figure 2 is 120 degrees. The number of fins 20 belonging to the same height position may be two or four or more. In other words, the multiple fins 20 may be arranged in a double helix or in a quadruple or more helix.

[0021] When the angle between adjacent fins 20 in a given direction within a series of fins 20 belonging to the same helix (a series of fins 20 constituting the same helix) is defined as angle θ (angle centered on axis X), the angle θ is set to be between 22.5 degrees and 60 degrees. For example, when the angle θ is 60 degrees, one series of fins 20 arranged in a helical shape will consist of 6 fins 20 that encircle the cylindrical body 10. For the sake of understanding, in Figures 1 and 2, rows of fins 20 belonging to the same helical line are distinguished by different hatching or cross-hatching patterns.

[0022] The width dimension W of a single fin 20 is set to be between 0.1 and 0.16 times the maximum outer diameter of the exterior component 30. The width dimension W of the fin 20 is equal to the amount of protrusion of the fin 20 from the exterior member 30.

[0023] The pitch P of the fins 20 in a predetermined direction within a series of fins 20 belonging to the same helical line is set to approximately five times the maximum outer diameter of the exterior member 30. The pitch P is equal to the change in height when the set of fins 20 completes one rotation around the cylindrical body 10.

[0024] The height dimension H of a single fin 20 (dimension along the axis X) is uniquely determined by the angle θ and the pitch P.

[0025] As described above, by providing multiple fins 20, the vibration of the chimney 1 (vortex-induced vibration due to wind) can be effectively suppressed.

[0026] Furthermore, from the perspective of suppressing vortex-induced vibrations, weights or dampers may be installed at the top of chimney 1.

[0027] <About Chimney Manufacturing Methods> First, as shown in Figure 7, the fixing device 40 is connected to the outer circumferential surface 10s of the cylindrical body 10. Next, as shown in Figure 8, the base edge 20e of each fin 20 is welded to the outer surface 10s of the cylindrical body 10. At this time, the purlin 41 of the fastener 40 fits into the notch 20c of each fin 20. Next, as shown in Figure 9, the exterior member 30 is screwed to the furring strip 41 of the fastener 40, and the exterior member 30 covers the outer surface 10s of the cylindrical body 10. Alternatively, the outer surface 10s of the cylindrical body 10 may be covered with the heat-insulating material 50 before covering it with the exterior member 30.

[0028] When the outer circumferential surface 10s of the cylindrical body 10 is covered with the outer casing member 30, each fin 20 is passed through the insertion portion 30i of the outer casing member 30. The insertion portion 30i may be, for example, a slit 31s formed in the exterior plate 31, as shown in Figure 10. Alternatively, the insertion portion 30i may be, for example, a gap formed between two adjacent exterior plates 31 in the circumferential direction, as shown in Figure 11.

[0029] Now, let's explain the exterior panel 31. For example, as shown in Figure 2, the exterior member 30 is a cylindrical member whose inner diameter is larger than the outer diameter of the cylindrical body 10. However, the cylindrical exterior member 30 does not have to be a single, continuous member; for example, as shown in Figure 4, it may be constructed by arranging plate-shaped parts (plate-shaped parts smaller than the exterior member 30) that extend in a predetermined direction and in the circumferential direction adjacent to each other in each direction. In other words, the exterior member 30 has an exterior division section 30d that can divide the exterior member 30 in a predetermined direction and in the circumferential direction, and can be divided into small plate-shaped parts at the exterior division section 30d. These small plate-shaped parts are defined as exterior plates 31.

[0030] All processes for manufacturing chimney 1 do not necessarily have to be carried out at the construction site of chimney 1. For example, as shown in Figures 12 and 13 and Figures 14 and 15, if the chimney 1 is divided into multiple segments Sg in a predetermined direction at a dividing section 1d, each segment Sg, which is equipped with multiple fins 20 and exterior members 30, may be manufactured at a factory (located in a different place from the construction site), and the multiple segments Sg may be transported to the construction site, where the multiple segments Sg can be stacked vertically to manufacture (construct) the chimney 1.

[0031] For example, in the segment Sg shown in Figure 14, the height dimension H2 of the lower fin 20 is smaller than the height dimension H1 of the upper fin 20. In this case, the lower fin 20 is combined with the fins 20 of other segments Sg located below it (shown by dashed lines in Figure 14) and connected in a predetermined direction to ensure the original height dimension H1. That is, the divided section 1d of the chimney 1 may divide the cylindrical body 10, the fins 20, and the exterior plate 31 in a predetermined direction. Here, the position of the exterior divided section 30d in the predetermined direction may approximately coincide with the position of the divided section 1d.

[0032] From the viewpoint of miniaturizing the segment Sg and further facilitating transportation, each fin 20 may be configured to be divisible in the radial direction, as shown in Figures 16 to 19. Specifically, each fin 20 may be provided with a fin division portion 20d that divides each fin 20 into a base portion 21 and a tip portion 22. Here, the base portion 21 is the radially inward portion, and the tip portion 22 is the radially outward portion. In this case, segments Sg, each equipped with base ends 21 of multiple fins 20 and exterior members 30, may be manufactured at a factory, the multiple segments Sg may be transported to a construction site, where a single fin 20 is completed by connecting the tip 22 to the base end 21, and the chimney 1 may be manufactured (constructed) by stacking the multiple segments Sg with completed fins 20 in a vertical direction. The tip portion 22 and the base portion 21 are connected, for example, by bolt fastening.

[0033] In this case, it is preferable that the fin division portion 20d is located outside the exterior member 30 in the radial direction. This allows the divided fins 20 to be integrated at the fin division portion 20d outside the exterior member 30, even after the cylindrical body 10 has been covered with the exterior member 30.

[0034] <Effects> The device comprises a columnar cylindrical body 10 having an axis X extending in a predetermined direction, a plurality of plate-shaped fins 20 projecting radially from the cylindrical body 10 and expanding radially and in a predetermined direction, with thickness in the circumferential direction, and an outer covering member 30 covering the outer circumferential surface 10s of the cylindrical body 10. The outer covering member 30 has insertion portions 30i through which each fin 20 is inserted radially, so that the fins 20 projecting radially from the main body or cylindrical body 10 protrude to the outside of the outer covering member 30 through the insertion portions 30i of the outer covering member 30. In other words, by providing an outer covering member 30 having insertion portions 30i, the outer circumferential surface 10s of the cylindrical body 10 can be easily covered with the outer covering member 30 even if fins 20 are present.

[0035] Since the exterior member 30 has an exterior division portion 30d that can divide the exterior member 30 in a predetermined direction and in a circumferential direction, the exterior member 30 can be handled in separate small parts (exterior plates 31). This makes it easier to handle the exterior plates 31, and further makes it easier to cover the outer circumferential surface 10s of the cylindrical body 10 with the exterior member 30.

[0036] Since the insertion portion 30i is a slit 31s formed in the exterior plate 31, the insertion portion 30i can be formed in a simple manner.

[0037] Since the insertion portion 30i is defined as a gap formed between two adjacent exterior panels 31 in the circumferential direction, the insertion portion 30i can be formed without requiring complex processing of the exterior panels 31 themselves.

[0038] Each fin 20 has a fin division section 20d that allows the fin 20 to be divided radially, so that the assembly consisting of the cylindrical body 10 and the fins 20 can be made smaller radially during the construction (e.g., during transportation) of the chimney 1. This makes it possible to easily transport the assembly. Furthermore, since the fin division portion 20d is located outside the exterior member 30 in the radial direction, even after the cylindrical body 10 (assembly) is covered with the exterior member 30, the divided fins 20 can be integrated at the fin division portion 20d outside the exterior member 30.

[0039] Since the chimney 1 has a segmented section 1d that can be divided in a predetermined direction, the divided chimney 1 (segment Sg) can be easily transported before the construction of the chimney 1 (for example, during transport).

[0040] Since each fin 20 is arranged helically with respect to the axis X, a series of rows of multiple fins 20 act as if they were a single helical fin, thereby suppressing vibrations of the chimney 1 (vortex-excited vibrations due to Karman vortices).

[0041] The cylindrical body 10 is equipped with a reinforcing member 60 connected to the outer circumferential surface 10s, and since the fins 20 are connected to both the outer circumferential surface 10s of the cylindrical body 10 and the reinforcing member 60, the fins 20 can be firmly connected.

[0042] <Variation> As shown in Figure 20, the chimney 1 may be equipped with a reinforcing member 60. The reinforcing member 60 is, for example, a rod-shaped member with one end connected to the cylindrical body 10 or the fixing device 40 and the other end connected to the fin 20.

[0043] <Note> As described above, this embodiment can be understood, for example, as follows.

[0044] A chimney (1) according to a first aspect of the present disclosure comprises a columnar body (10) having an axis (X) extending in a predetermined direction, a plurality of plate-shaped fins (20) projecting radially from the body with respect to the axis and expanding in the radial and predetermined directions, and having thickness in the circumferential direction with respect to the axis, and an exterior member (30) covering the outer circumferential surface (10s) of the body, wherein the exterior member has an insertion portion (30i) through which each of the fins is inserted in the radial direction.

[0045] The device comprises a columnar body having an axis extending in a predetermined direction, a plurality of plate-shaped fins projecting radially from the body and expanding radially and in a predetermined direction, with thickness in the circumferential direction, and an outer covering member covering the outer surface of the body. The outer covering member has insertion parts through which each fin is inserted radially, so that the fins projecting radially from the body protrude through the insertion parts of the outer covering member to the outside of the outer covering member. In other words, by providing an outer covering member with insertion parts, the outer surface of the body can be easily covered with the outer covering member even if fins are present.

[0046] In a chimney according to a second aspect of the present disclosure, in the first aspect, the exterior member has an exterior division portion (30d) that can divide the exterior member in the predetermined direction and the circumferential direction.

[0047] The exterior component has an exterior division section that allows the exterior component to be divided in a predetermined direction and in a circumferential direction, so that the exterior component can be handled in separate small parts (exterior panels (31)). This makes it easier to handle the exterior panels and makes it even easier to cover the outer surface of the main body with the exterior component.

[0048] In the chimney according to the third aspect of this disclosure, in the second aspect, when each portion of the exterior member divided by the exterior division portion is referred to as an exterior plate (31), the insertion portion is a slit (31s) formed in the exterior plate.

[0049] Since the insertion portion is a slit formed in the exterior panel, the insertion portion can be formed using a simple method.

[0050] In the chimney according to the fourth aspect of this disclosure, in the second aspect, when each portion of the exterior member divided by the exterior division portion is referred to as an exterior plate (31), the insertion portion is defined as a gap formed between two exterior plates adjacent to each other in the circumferential direction.

[0051] Since the insertion portion is defined as a gap formed between two adjacent exterior panels in the circumferential direction, the insertion portion can be formed without requiring complex processing of the exterior panels themselves.

[0052] In the chimney according to the fifth aspect of this disclosure, in any of the first to fourth aspects, each fin has a fin division portion (20d) that can divide the fin in the radial direction, and the fin division portion is located outside the exterior member in the radial direction.

[0053] Each fin has a fin division section that allows the fin to be divided radially, so that the assembly consisting of the main body and fins can be made smaller radially during chimney construction (e.g., during transportation). This makes it easier to transport the assembly. Furthermore, since the fin division section is located outside the exterior member in the radial direction, even after the main body (assembly) has been covered with the exterior member, the divided fins can be integrated at the fin division section outside the exterior member.

[0054] In the sixth aspect of the present disclosure, the chimney has a divided portion (1d) that can be divided in the predetermined direction, in any of the first to fifth aspects.

[0055] Since it has a dividing section that can be divided in a predetermined direction, the divided chimney can be easily transported before construction (for example, during transport).

[0056] A chimney according to a seventh aspect of this disclosure, in any of the first to sixth aspects, comprises a reinforcing member (60) connected to the outer circumferential surface of the main body, and the fins are connected to the outer circumferential surface of the main body and the reinforcing member.

[0057] The main body is equipped with reinforcing members connected to its outer surface, and since the fins are connected to both the outer surface of the main body and the reinforcing members, the fins can be firmly connected.

[0058] In the chimney according to the eighth aspect of this disclosure, in any of the first to seventh aspects, each of the fins is arranged helically with respect to the axis.

[0059] Since each fin is arranged spirally with respect to the axis, a series of fins acting as a single spirally formed fin can suppress chimney vibrations (vortex-excited vibrations caused by Karman vortices).

[0060] In the chimney according to the ninth aspect of this disclosure, in any of the first to seventh aspects, the width dimension of the fin is 0.1 times or more and 0.16 times or less the maximum outer diameter of the exterior member, the fins are arranged in multiple helical patterns with respect to the axis, the angle between adjacent fins in a predetermined direction in a series of fins belonging to the same helix is ​​22.5 degrees or more and 60 degrees or less, and the pitch of the fins in the predetermined direction in a series of fins belonging to the same helix is ​​approximately 5 times the maximum outer diameter of the exterior member.

[0061] A method for manufacturing a chimney according to a tenth aspect of the present disclosure is a method for manufacturing a chimney according to the first aspect, wherein each fin is connected to the outer surface of the main body, and after each fin is connected to the outer surface of the main body, the outer surface of the main body is covered with the exterior member.

[0062] In a method for manufacturing a chimney according to an eleventh aspect of the present disclosure, in the tenth aspect, the chimney is provided with a fastener for attaching the exterior member to the outer circumferential surface of the main body, and the fastener is connected to the outer circumferential surface of the main body before each fin is connected to the outer circumferential surface of the main body, and after each fin is connected to the outer circumferential surface of the main body, the exterior member is connected to the fastener so that the outer circumferential surface of the main body is covered with the exterior member.

[0063] In a method for manufacturing a chimney according to a twelfth aspect of the present disclosure, in the tenth or eleventh aspect, each fin has a fin division portion that is divisible in the radial direction, the fin division portion is located outside the exterior member in the radial direction, and after the exterior member covers the outer circumferential surface of the main body, the fins are integrated at the fin division portion.

[0064] In a method for manufacturing a chimney according to a thirteenth aspect of the present disclosure, in any of the tenth to twelfth aspects, the chimney has a divided portion that can be divided in the predetermined direction, and the chimney is integrated at the divided portion after each fin is connected to the outer circumferential surface of the main body and before the outer circumferential surface of the main body is covered with the exterior member. [Explanation of symbols]

[0065] 1 Chimney 1d division 10 barrels (main body) 10s outer surface 20 fins 20cm notch 20d Fin division section 20e proximal edge 21 Proximal end 22 Tip 30 Exterior components 30d Exterior split section 30i insertion section 31 Exterior plate 31s Slit (insertion part) 40 Fixtures 41 Furring strips 42 vertical frames 50 Insulation material 60 Reinforcement devices

Claims

1. A columnar body having an axis extending in a predetermined direction, A plurality of plate-shaped fins project radially from the main body with respect to the axis, extend radially and in the predetermined direction, and have thickness in the circumferential direction with respect to the axis, An exterior member covering the outer circumferential surface of the main body, Equipped with, The exterior member has an insertion portion through which each of the fins is inserted in the radial direction. chimney.

2. The exterior member has an exterior division portion that can divide the exterior member in the predetermined direction and the circumferential direction. The chimney according to claim 1.

3. When each part of the exterior member divided by the exterior division section is called an exterior panel, The aforementioned insertion portion is a slit formed in the exterior plate. The chimney according to claim 2.

4. When each part of the exterior member divided by the exterior division section is called an exterior panel, The aforementioned insertion portion is a gap formed between two adjacent exterior panels in the circumferential direction. The chimney according to claim 2.

5. Each of the fins has a fin division portion that can divide the fin in the radial direction, The fin division portion is located outside the exterior member in the radial direction. The chimney according to claim 1.

6. It has a dividing portion that can be divided in the predetermined direction. The chimney according to claim 1.

7. The main body is equipped with a reinforcing member connected to the outer circumferential surface, The fins are connected to the outer circumferential surface of the main body and the reinforcing member. The chimney according to claim 1.

8. Each of the fins is arranged spirally with respect to the axis. A chimney according to any one of claims 1 to 7.

9. The width dimension of the fin is 0.1 times or more and 0.16 times or less the maximum outer diameter of the exterior member. The fins are arranged in a multiple helical pattern with respect to the axis, In a series of fins belonging to the same helical shape, the angle between adjacent fins in the predetermined direction is set to be between 22.5 degrees and 60 degrees. The pitch of the fins in the predetermined direction within a series of fins belonging to the same helical shape is set to approximately five times the maximum outer diameter of the exterior member. The chimney according to claim 1.

10. A method for manufacturing a chimney according to claim 1, Each of the fins is connected to the outer circumferential surface of the main body, After each fin is connected to the outer surface of the main body, the outer surface of the main body is covered with the exterior member. Chimney manufacturing method.

11. The chimney is equipped with fasteners for attaching the exterior member to the outer surface of the main body, Before connecting each of the fins to the outer circumferential surface of the main body, connect the fastener to the outer circumferential surface of the main body. After connecting each of the fins to the outer circumferential surface of the main body, the outer casing member is connected to the fastener, thereby covering the outer circumferential surface of the main body with the outer casing member. The method for manufacturing a chimney according to claim 10.

12. Each of the fins has a fin division portion that can be divided in the radial direction, The fin division portion is located outside the exterior member in the radial direction, After covering the outer circumferential surface of the main body with the exterior member, the fins are integrated at the fin division portion. The method for manufacturing a chimney according to claim 10.

13. The chimney has a divided section that can be divided in the predetermined direction, After connecting each of the fins to the outer surface of the main body, and before covering the outer surface of the main body with the exterior member, the chimney is integrated at the divided portion. The method for manufacturing a chimney according to claim 10.

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