Chimney

Abstract

To facilitate connection work of adjacent panels, and prevent smoke leakage from a connection part in a panel assembly type chimney.SOLUTION: A chimney 1 includes a plurality of panels 11 constituting a chimney peripheral wall 1a. Two overlapped connection end parts 15 of the panels 11 adjacent in a circumferential direction or an axial direction of the chimney peripheral wall 1a are connected by a connection member 20. The connection member 20 includes: an axial force member 21 penetrating into the two connection end parts 15 and introduced with an axial force; and a pair of pressure-contact parts 30, 23 provided in both end parts of the axial force member 21 and holding an axial force by being brought into pressure contact with the facing connection end parts 15. At least one of the pressure-contact parts 30 is formed in a cylindrical shape as a different body from the axial force member 21, is fitted into an outer periphery of the axial force member 21, and is caulked to the axial force member in an unrotatable and unextractable manner.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chimney, and more particularly to a panel-assembled chimney. [Background technology]

[0002] For example, Patent Document 1 discloses a panel assembly chimney made by assembling multiple rectangular panels into a rectangular cylindrical shape. At least one of two adjacent panels has an end bent at a right angle and overlapped with the end of the other panel. The ends of these two panels are connected together with bolts and nuts. In the panel assembly chimney of Patent Document 2, each panel has a structure in which steel plates are attached to both the inside and outside of an insulating wall. The ends of the outer steel plates of two adjacent panels are connected to each other with bolts and nuts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-052228 [Patent Document 2] Japanese Patent Application Publication No. 2019-105388 Summary of the Invention [Problem to be solved by the invention]

[0004] In the panel assembly chimneys described in the above-mentioned patent documents, there is a risk of smoke leakage due to loosening of the bolts and nuts connecting the ends of adjacent panels. While it is possible to connect the panels by welding instead of using bolts and nuts, the welding work is complicated and takes a long time. In view of the above circumstances, the present invention aims to provide a panel assembly type chimney that can facilitate the work of connecting adjacent panels and prevent smoke leakage from the connecting parts. [Means for solving the problem]

[0005] In order to solve the above problem, the present invention provides a chimney having a plurality of panels constituting a chimney peripheral wall, Two overlapping connection ends of adjacent panels in the circumferential or axial direction of the chimney peripheral wall are connected to each other by a connection member, The connecting member is an axial force member that penetrates the two connecting end portions and to which an axial force is introduced; a pair of pressure contact portions provided at both ends of the axial force member, the pressure contact portions being pressed against the connecting ends facing each other to hold the axial force; and at least one of the pressure contact portions is formed in a cylindrical shape separate from the axial force member, fitted onto the outer periphery of the axial force member, and crimped to the axial force member so as to be non-rotatable and non-removable. This chimney makes it easier to connect panels than by welding, and also prevents smoke from leaking from the connection between adjacent panels by pressing the two connecting ends together with the axial force of the axial force member.

[0006] Preferably, the connecting members are provided at a plurality of locations in the extending direction of the connecting end portion, and the interval between adjacent connecting members is 50 mm or more and 250 mm or less. This can reliably prevent smoke leakage.

[0007] Preferably, the thickness of the connecting end portion is 5 mm or more and 30 mm or less. This prevents deformation of the connecting end portion and reliably prevents smoke leakage.

[0008] Preferably, the axial force is 60 kN or more. The axial force presses the connecting ends together to make them tightly adhere to each other, thereby reliably preventing smoke leakage. [Effects of the Invention]

[0009] According to the present invention, in a panel assembly chimney, the work of connecting adjacent panels can be facilitated and smoke leakage from the connecting parts can be prevented. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view showing a part of a chimney according to one embodiment of the present invention. [Figure 2] FIG. 2 is a plan cross-sectional view of the chimney taken along line II-II in FIG. [Figure 3] FIG. 3 is an exploded cross-sectional plan view of the chimney. [Figure 4] FIG. 4 is an enlarged plan sectional view of the panel connection portion shown in circle IV in FIG. [Figure 5] 5 is a front cross-sectional view of the panel connecting portion taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a front cross-sectional view of the panel connecting portion in a state before the tightening operation. [Figure 8] FIG. 8 is a front cross-sectional view of the panel connecting portion in a tightened state. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 shows a chimney 1 attached to a building such as an office building. Exhaust smoke from a boiler or the like in the building is led out of the building by the chimney 1.

[0012] As shown in Fig. 1, the chimney 1 is divided into a plurality of chimney units 10. As shown in Fig. 2, each chimney unit 10 is formed in a cylindrical shape with a rectangular (polygonal) cross section, for example. The plurality of chimney units 10 are stacked vertically in a row.

[0013] As shown in FIG. 3, the chimney unit 10 includes four (a plurality of) panels 11. Each panel 11 includes an insulating layer 12, an outer surface layer 13, and an inner surface layer 14. The insulating layer 12 is made of a hard insulating material such as calcium silicate, and is formed in the shape of a rectangular panel or thick plate. The outer surface layer 13 is made of, for example, a rectangular steel plate, and forms the outer surface of the chimney by covering the outer surface of the insulating layer 12. The inner surface layer 14 is made of, for example, a rectangular steel plate, and forms the inner surface of the chimney by covering the inner surface of the insulating layer 12.

[0014] As shown in Figures 2 and 3, four panels 11 of a chimney unit 10 are assembled and arranged to form four sides of the chimney unit 10. Thus, the chimney 1 is a panel-assembled chimney. As shown in Figures 1 and 2, the chimney peripheral wall 1a is formed by the panels 11 of a plurality of chimney units 10 stacked one on top of the other. Adjacent panels 11 in the circumferential and axial directions (up and down) of the chimney peripheral wall 1a are connected to each other via a panel connecting structure 2. That is, two adjacent panels 11 of each chimney unit 10 that are adjacent to each other in the circumferential direction and perpendicular to each other are connected to each other via a circumferential panel connecting structure 2A. Furthermore, two panels 11 of adjacent chimney units 10 that are oriented in the same direction are connected to each other via an axial panel connecting structure 2B.

[0015] 1 and 3, the panel connection structure 2 includes connection end portions 15 of two panels 11 to be connected, and a plurality of connection members 20. The peripheral edge of the outer surface layer 13 of each panel 11 extends beyond the outer surface of the insulating layer 12 to form the connection end portions 15. Therefore, the connection end portions 15 are made of steel material that is integral with the outer surface layer 13. The thickness of the connection end portions 15 is preferably 5 mm or more and 30 mm or less.

[0016] As shown in Figure 4, the connecting end 15 of one of the two orthogonal panels 11 in the circumferential panel connection structure 2A is bent at a right angle from the main portion 13a of the outer surface layer 13 of that panel 11 (the portion covering the thermal insulation layer 12). The connecting end 15 of the other panel 11 extends straight from the main portion 13a of the outer surface layer 13 of that panel 11. The connecting end portions 15 of these two panels 11 are overlapped with each other. The two overlapping connecting end portions 15 are connected to each other by a connecting member 20.

[0017] As shown in Figure 6, in the axial panel connection structure 2B, the connection ends 15 of two axially adjacent (vertically) panels 11 are each bent at right angles from the main portion 13a of the outer surface layer 13, overlapped on top of each other, and connected by a connecting member 20.

[0018] 1 and 5, a plurality of connecting members 20 are provided at intervals in the extension direction of the connecting end portion 15 of each panel connection structure 2A, 2B. In other words, the connecting members 20 are provided at a plurality of locations in the extension direction of the connecting end portion 15. The interval between adjacent connecting members 20 is preferably 50 mm or more and 250 mm or less.

[0019] 5 and 6, the connecting member 20 includes an axial force member 21 and a pressure contact member 30. The axial force member 21 has a shaft portion 22 and a head portion 23 (the other pressure contact portion). The shaft portion 22 passes through two connecting end portions 15. The connecting end portions 15 are formed with through holes 15c through which the shaft portions 22 pass.

[0020] Concave and concave portions 22a are formed on the outer peripheral surface of the shaft portion 22. The concave and convex portions 22a are formed by spiral grooves and spiral ridges, but are not limited thereto. They may be formed by annular convex portions and annular concave portions alternately formed in the axial direction, or by a number of spot-like convex and concave portions. A head portion 23 is integrally formed on the base end (left end in FIG. 5 ) of the shaft portion 22. The head portion 23 is formed in a disk shape with a larger diameter than the shaft portion 22 and is pressed against the connecting end portion 15. A pulling protrusion 24 with a smaller diameter than the shaft portion 22 is formed on the tip end (right end in FIG. 5 ) of the shaft portion 22. A hook portion 24a is formed on the outer periphery of the pulling protrusion 24. The hook portion 24a is formed, for example, by annular convex portions and annular concave portions alternately formed in the axial direction.

[0021] The axial force member 21 is made of a material that is harder than the press-fitting member 30 and can generate axial force without yielding when the press-fitting member 30 is crimped. Examples of such materials include titanium alloys and carbon steel for mechanical structures. An axial force is applied to the shaft portion 22 and thus to the axial force member 21. The axial force is preferably 60 kN or more.

[0022] A pressure contact member 30 (one of the pressure contact portions) is provided on the outer periphery of the shaft portion 22. The pressure contact member 30 is formed in a cylindrical shape separate from the axial force member 21 and is fitted onto the outer periphery of the shaft portion 22. The pressure contact member 30 includes a cylindrical portion 31 and an annular flange portion 32. The flange portion 32 is provided on the outer periphery of the base end portion (the left end portion in FIG. 5 ) of the cylindrical portion 31. The flange portion 32 is pressed against the connecting end portion 15.

[0023] The material of the pressure contact member 30 is, for example, stainless steel, aluminum alloy, carbon steel, or the like.

[0024] The pressure contact member 30 is crimped to the shank 22 of the axial tension member 21 so as to be non-rotatable and non-removable, and is in close contact with the shank 22. The inner peripheral portion of the pressure contact member 30 is plastically deformed to fit the uneven shape of the outer peripheral surface of the shank 22. The inner peripheral surface of the pressure contact member 30 is formed with uneven portions 33 that mesh with the uneven portions 22a of the shank 22. The outer peripheral portion of the cylindrical portion 31 is plastically deformed in the diameter-reducing direction. The flange portion 32 is plastically deformed in the diameter-expanding direction so as to be crushed in the axial direction.

[0025] The pressure contact member 30 (one pressure contact portion) and the head 23 (the other pressure contact portion) face each other across the two overlapping connecting end portions 15, and are each pressure-contacted to the connecting end portions 15. In other words, a pair of pressure contact portions 23, 30 are provided at both ends of the axial force member 21. These pressure contact portions 23, 30 are each pressure-contacted to the connecting end portions 15 that face each other. This maintains the axial force of the shank 22.

[0026] The chimney 1 is constructed as follows. The chimney unit 10 is assembled, for example, in a factory. The panels 11 adjacent to each other in the circumferential direction of the chimney unit 10 are arranged so as to be perpendicular to each other, and the connecting ends 15 of these panels 11 are overlapped with each other. Next, the axial force member 21 of the connecting member 20 is passed through the through-hole 15c of the overlapping connecting end portions 15. The pressure contact member 30 is fitted onto the outer periphery of the shaft portion 22 of the axial force member 21. At this stage, the inner circumferential surface of the pressure contact member 30 is a smooth cylindrical concave surface, and no uneven portion 33 is formed.

[0027] Thereafter, as shown in FIG. 7, the pressure contact member 30 is crimped by a push-pull crimping tool 40. The push-pull crimping tool 40 includes a body 41, a hammer 42, a chuck 43, and a force transmission unit 44. The hammer 42 is formed in an annular shape and is provided on the body 41 so as to be able to advance and retreat. The chuck 43 is provided in the center of the hammer 42. The chuck 43 has a plurality of hooking claws 43a. The chuck 43 can expand and contract as the hooking claws 43a advance and retreat in the radial direction. The force transmission unit 44 is connected to the hammer 42 and the chuck 43 so as to be able to transmit a push-pull force. An electric motor 45 is connected to an input portion of the force transmission unit 44. Preferably, the electric motor 45 is driven by a battery 46.

[0028] When the electric motor 45 is driven with the chuck 43 fitted onto the pulling projection 24, the rotational torque is converted into a force F42 pushing the hammer 42 forward (to the left in FIG. 7 ) and a force F43 pulling the chuck 43 backward (to the right in FIG. 7 ) while being decelerated by the force transmission unit 44. The pushing force F42 causes the hammer 42 to move forward, plastically deforming the tubular portion 31 of the crimping member 30 in the diameter-reducing direction, thereby strongly crimping the tubular portion 31 onto the shank 22 and crimping it. As a result, the inner circumferential surface of the crimping member 30 is deformed to follow the concave-convex portions 22a on the outer circumferential surface of the shank 22, forming concave-convex portions 33, which mesh with the concave-convex portions 22a. As a result, the crimping member 30 is tightly attached to the axial force member 21 so as to be unable to rotate or pull out. Furthermore, the hammer 42 strikes the flange 32, pressing the flange 32 against the connecting end 15 and compressing and deforming the flange 32 in the thickness direction. Also, when the hammer 42 advances, the chuck 43 is reduced in diameter, the hooking claws 43a are hooked onto the hooked portion 24a, and a pulling force F43 is applied to the chuck 43. This introduces a tensile axial force to the axial force member 21. Furthermore, the head 23 of the axial force member 21 and the pressure contact member 30 are pressed against the opposing connecting end portions 15, so that the two connecting end portions 15 are pressed against each other strongly and tightly adhered.

[0029] Thereafter, the forces F42 and F43 are released, and the push-pull crimping tool 40 is separated from the connecting member 20. Even after the push-pull crimping tool 40 is separated, the axial force of the shank 22 remains. The residual axial force maintains the pressure contact force of the pair of pressure contact portions 23, 30 on the connecting end portions 15, and maintains the two connecting end portions 15 pressed against each other in close contact. The time required to crimp one connecting member 20 with the push-pull crimping tool 40 is about several seconds. The push-pull crimping tool 40 separated from one connecting member 20 is used to crimp another connecting member 20. In this way, the panel connecting structure 2A is constructed. In this way, the panels 11 of the chimney unit 10 can be efficiently connected to each other in a short time, and the chimney unit 10 can be efficiently assembled. Compared to connecting adjacent panels 11 of the chimney unit 10 by welding or the like, the work time can be significantly reduced and the connecting work can be facilitated.

[0030] The fabricated chimney units 10 are carried to a building construction site and stacked together to erect the chimney 1. At this time, a push-pull crimping tool 40 is used to connect the panels 11 of adjacent chimney units 10 vertically with the connecting members 20 to construct the panel connection structure 2A. In the panel connection structure 2A as well, the residual axial force of the axial force members 21 keeps the connecting ends 15 of the two panels 11 pressed against each other and in close contact. In this way, the vertically stacked chimney units 10 can be efficiently connected to each other in a short time, and the chimney 1 can be efficiently erected. Compared to connecting vertically adjacent chimney units 10 by welding or the like, the work time can be significantly reduced and the connecting work can be facilitated.

[0031] According to the chimney 1, the connecting ends 15 of adjacent panels 11 are pressed against each other by the axial force of the axial force members 21, thereby preventing smoke leakage between these connecting ends 15. By setting the axial force to 60 kN or more, the connecting ends 15 can be reliably brought into close contact with each other, reliably preventing smoke leakage. Furthermore, since the axial force of the axial force member 21 can remain for a long period of time (several decades to several decades), the connecting member 20 hardly loosens over time, and smoke leakage can be prevented for a long period of time. By setting the interval between adjacent connecting members 20 to be 50 mm or more and 250 mm or less, smoke leakage from between the connecting ends 15 can be reliably prevented. By making the thickness of the connecting end portions 15 between 5 mm and 30 mm, deformation of the connecting end portions 15 due to crimping can be prevented, and the two connecting end portions 15 can be pressed tightly together to prevent gaps from forming between the connecting end portions 15. Therefore, smoke leakage from between the connecting end portions 15 can be more reliably prevented.

[0032] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the planar cross-sectional shape of the chimney unit 10 is not limited to a rectangle, and may be a polygon other than a rectangle. Either one of the circumferential panel connection structure and the axial panel connection structure of the chimney 1 may be a connection structure using the connection members 20, and the other may be another connection structure such as bolts and nuts. The pair of pressure contact portions of the connecting member 20 may both be cylindrical and separate from the axial force member, fitted onto the outer periphery of the axial force member, and crimped to the axial force member so as to be non-rotatable and non-removable. A heat-resistant packing may be interposed between the connecting ends 15 of the two panels 11 in the panel connecting structures 2A and 2B. [Industrial Applicability]

[0033] The present invention is applicable to, for example, a chimney attached to a building. [Explanation of symbols]

[0034] 1. Chimney 1a Chimney wall 2-panel connection structure 2A Circumferential panel connection structure 2B Axial panel connection structure 10 Chimney Unit 11 Panels 12 Insulation layer 13 Outer layer 13a Main Section 14 Inner layer 15 Connecting end 15c through hole 20 Connecting member 21 Axial force member 22 Shaft 22a Uneven part 23 Head (other pressure contact part) 24 Pulling protrusion 24a Hooked part 30 Press-fit member (one press-fit part) 31 Cylinder part 32 Tsuba 33 Uneven part 40 Push-pull crimping tool

Claims

1. A chimney having a plurality of panels constituting a chimney peripheral wall, Two overlapping connection ends of adjacent panels in the circumferential direction or the axial direction of the chimney peripheral wall are connected to each other by a connection member, and the connection member is an axial force member that penetrates the two connecting end portions and to which an axial force is introduced; a pair of pressure contact portions provided at both ends of the axial force member, the pressure contact portions being pressed against the connecting ends facing each other to hold the axial force; wherein at least one of the pressure contact portions is formed in a cylindrical shape separate from the axial force member, fitted onto the outer periphery of the axial force member, and crimped to the axial force member so as to be non-rotatable and non-removable.

2. 2. The chimney according to claim 1, wherein the connecting members are provided at a plurality of locations in the extending direction of the connecting end portion, and the interval between adjacent connecting members is 50 mm or more and 250 mm or less.

3. 2. The chimney according to claim 1, wherein the thickness of the connecting end portion is 5 mm or more and 30 mm or less.

4. The chimney according to claim 1, wherein the axial force is 60 kN or more.

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