Building chimney

Abstract

To provide a building chimney having a flange joint which suppresses or prevents water from leaking to the outside of a chimney, even when the water, such as rainwater and dew condensation water, has entered a joint part of chimney units from the inside of the chimney.SOLUTION: A plurality of chimney units 10 of a building chimney 1 are stacked vertically. An upper flange 21 is made to protrude outward from a lower end part of an upper side chimney unit 16 out of two chimney units 10 adjacent to each other vertically. A lower flange 22 is made to protrude outward from an upper end part of a lower side chimney unit 17 40 out of the two chimney units 10, via connection means. The flanges 21, 22 are overlapped with each other and are connected with a joint bolt 30. A connection plate 41 of the connection means 40 is made to protrude upward from the lower side chimney unit 17, and the lower flange 22 is joined to an upper end part of the connection plate 41, so that an upper surface of the lower flange 22 is arranged at a place higher than an upper end of an outside surface of the lower side chimney unit 17.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a chimney attached to a building, and more particularly to a chimney for a building having a flange joint as a connection structure between upper and lower chimney units.

Background Art

[0002] Generally, chimneys for discharging exhaust gas are provided inside or on the outer wall of a building having a boiler, a generator, or the like. This type of chimney for a building is divided into a plurality of cylindrical chimney units. These chimney units are vertically stacked in a row. Each chimney unit is suspended and supported by a support portion of the building body. The upper and lower chimney units are relatively displaceable in order to follow the inter-story displacement of the building during an earthquake (see Patent Document 1, etc.).

[0003] On the other hand, the distance between the upper and lower support portions of the building body may be several times the length of one chimney unit. Between these support portions, two adjacent chimney units are connected by the following flange joint. Of the two chimney units, an upper flange is provided at the lower end portion of the upper chimney unit so as to protrude outward. A lower flange is provided at the upper end portion of the lower chimney unit so as to protrude outward. These upper and lower flanges are joined by bolts (see Patent Document 2, etc.).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In chimneys with the aforementioned flange joints, rainwater that enters the chimney or condensation generated inside the chimney may seep through the joint between the chimney units that make up the flange joint (between the lower end surface of the upper chimney unit and the upper end surface of the lower chimney unit), pass through the bolt holes of the flange or between the upper and lower flanges, and leak out of the chimney. In view of these circumstances, the present invention aims to suppress or prevent water, such as rainwater or condensation, from leaking out of a building chimney even if it enters the joint between chimney units from inside the chimney. [Means for solving the problem]

[0006] To solve the aforementioned problems, the present invention provides a building chimney comprising a plurality of chimney units attached to a building and stacked vertically, The upper flange protruding outward from the lower end of the upper chimney unit, of the two adjacent chimney units, Of the two chimney units, the lower flange protrudes outward from the upper end of the lower chimney unit via a connecting means and is superimposed on the lower surface of the upper flange, A joining bolt that connects the upper flange and the lower flange, The device is characterized in that, by the connecting means, the upper surface of the lower flange is positioned higher than the upper end of the outer surface of the lower chimney unit.

[0007] Preferably, the connecting means has a connecting plate joined to the outer surface of the lower chimney unit, the connecting plate protrudes above the upper end of the outer surface of the lower chimney unit, and the lower flange is joined to the upper end of the connecting plate.

[0008] Preferably, the portion of the connecting plate that protrudes above the lower chimney unit is positioned away from the upper chimney unit in a plan view. [Effects of the Invention]

[0009] According to the present invention, even if water such as rainwater or condensation enters the joint between chimney units from inside the chimney, it is possible to suppress or prevent the water from leaking out of the chimney. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a front view showing a portion of a building chimney according to one embodiment of the present invention. [Figure 2] Figure 2 is a plan cross-sectional view taken along the line II-II in Figure 1. [Figure 3] Figure 3 is a front cross-sectional view showing an enlarged view of circular section III in Figure 1. [Modes for carrying out the invention]

[0011] One embodiment of the present invention will be described below with reference to the drawings. As shown in Figure 1, Building 1 is equipped with a building chimney 3 for releasing exhaust gas from exhaust gas generating equipment such as boilers and generators. The building chimney 3 is installed vertically within the open shaft 1b of Building 1.

[0012] As shown in Figure 1, the building chimney 3 is divided into a plurality of cylindrical chimney units 10. As shown in Figure 2, the peripheral wall of each chimney unit 10 includes an insulating layer 11, an outer layer 12 covering the outer surface of the insulating layer 11, and an inner layer 13 covering the inner surface of the insulating layer 11. The insulating layer 11 is made of a rigid insulating material such as calcium silicate. The outer layer 12 and the inner layer 13 are made of steel plates, for example. The planar cross-sectional shape of the chimney unit 10 is rectangular, but is not limited to this; it may be circular or a polygon other than a rectangle.

[0013] As shown in Figure 1, multiple chimney units 10 of the building chimney 3 are stacked vertically in a single row. Two adjacent chimney units 10 are rigidly connected (fixed) via a fixed flange joint 4, or are connected via a non-fixed insert joint 5 so as to be able to move relative to each other. The rigidly connected chimney units 10 form an integrated chimney piece 14. The building chimney 3 is suspended and supported by an arm 15 on a support part 2 of the building frame 1a for each integrated chimney piece 14.

[0014] As shown in Figure 1, the flange joint 4 is also provided between two adjacent chimney units 10 that make up the integrated chimney piece 14. Hereinafter, the upper of the two chimney units 10 will be referred to as the "upper chimney unit 16," and the lower one as the "lower chimney unit 17."

[0015] As shown in Figure 3, the flange joint 4 includes an upper flange 21, a lower flange 22, a connecting bolt 30, and a connecting means 40. The upper flange 21 is formed in a rectangular annular shape that extends around the entire circumference of the upper chimney unit 16. The upper flange 21 protrudes horizontally outward from the lower end of the upper chimney unit 16. The inner circumferential surface of the upper flange 21 abuts against the side surface of the upper chimney unit 16 and is joined by welding. The upper flange 21 is positioned above the lower end surface of the upper chimney unit 16.

[0016] An upper vertical rib 23 is provided on the side surface of the upper chimney unit 16 above the upper flange 21. The upper flange 21 is reinforced by welding the lower end surface of the upper vertical rib 23 to the upper flange 21.

[0017] As shown in Figure 2, the lower flange 22 is formed in a rectangular ring shape that extends around the entire circumference of the lower chimney unit 17. The lower flange 22 protrudes horizontally outward from the upper end of the lower chimney unit 17.

[0018] As shown in FIG. 3, the upper surface of the lower flange 22 is overlapped with the lower surface of the upper flange 21. The upper flange 21 and the lower flange 22 are joined by joining bolts 30 and nuts 31. A heat-resistant packing 51 is interposed between the upper flange 21 and the lower flange 22.

[0019] As shown in FIG. 3, connecting means 40 is provided between the lower chimney unit 17 and the lower flange 22. Through the connecting means 40, the lower flange 22 is connected to the lower chimney unit 17.

[0020] As shown in FIGS. 2 and 3, the connecting means 40 has a spacer 42 and a connecting plate 41. The spacer 42 is formed in a plate shape and is annular so as to surround the entire circumference of the lower chimney unit 17. The spacer 42 is attached to the outer surface of the lower chimney unit 17 and fixed by welding. The welded portion on the upper end surface of the spacer 42 constitutes a watertight welded portion 43. By the watertight welded portion 43, the space between the upper end surface of the spacer 42 and the outer surface of the lower chimney unit 17 is sealed watertightly. The upper surface of the watertight welded portion 43 and thus the upper end surface of the spacer 42 are arranged at a slightly lower position than the upper end surface of the lower chimney unit 17. The upper surface of the watertight welded portion 43 may be flush with the upper end surface of the lower chimney unit 17.

[0021] As shown in FIG. 2, the connecting plate 41 is annular so as to surround the entire circumference of the spacer 42 and thus the entire circumference of the lower chimney unit 17. As shown in FIG. 3, the connecting plate 41 is attached to the outer surface of the spacer 42 and fixed by welding. The watertight welded portion 43 is also welded to the inner surface of the connecting plate 41. By the watertight welded portion 43, the space between the upper end surface of the spacer 42 and the inner surface of the connecting plate 41 is sealed watertightly.

[0022] Through the spacer 42, the connecting plate 41 is joined to the outer surface of the lower chimney unit 17. The connecting plate 41 is separated outward in plan view from the lower chimney unit 17 by the thickness of the spacer 42.

[0023] As shown in Figure 3, the connecting plate 41 protrudes above the spacer 42 and further above the lower chimney unit 17. At least the connecting plate 41 protrudes above the upper end of the outer surface of the lower chimney unit 17. The rising portion 41a of the connecting plate 41 that protrudes above the lower chimney unit 17 is separated from the upper chimney unit 16 in a plan view.

[0024] The inner circumference of the lower flange 22 is welded to the upper end of the connecting plate 41. The lower flange 22 is supported by the connecting means 40 so as to be positioned higher than the lower chimney unit 17. At least the upper surface of the lower flange 22 is positioned higher than the upper end of the outer surface of the lower chimney unit 17.

[0025] Lower vertical ribs 24 are provided on the outer surfaces of the connecting plate 41 and the lower chimney unit 17. The lower flange 22 is reinforced by welding the upper end surface of the lower vertical ribs 24 to the lower flange 22.

[0026] As shown in Figure 3, the outer surface of the upper chimney unit 16 and the rising portion 41a of the connecting plate 41 are separated and facing each other, thereby defining a rising gap 44 between them. The rising gap 44 extends upward from the lower chimney unit 17 and is an annular shape that extends around the entire circumference of the upper chimney unit 16. The upper flange 21 covers the upper end of the rising gap 44. The lower end of the rising gap 44 faces the watertight welded portion 43.

[0027] The lower end of the rising gap 44 faces the portion between the lower end surface of the upper chimney unit 16 and the upper end surface of the lower chimney unit 17. More specifically, a heat-resistant packing 50 is interposed between the upper and lower chimney units 16 and 17. The end surface 50e of the heat-resistant packing 50 faces the lower end of the rising gap 44.

[0028] In the building chimney 3, if rainwater enters the chimney and adheres to the inner surface of the chimney, or if condensation occurs on the inner surface of the chimney, this water may permeate through the interface surfaces 56 and 57 between the heat-resistant packing 50 and the upper and lower chimney units 16 and 17 by capillary action. Once this permeated water passes through the interface surfaces 56 and 57, it enters the vertical gap 44 and accumulates there. Therefore, the water that has passed through the interface surfaces 56 and 57 does not immediately leak out of the chimney. The rising gap 44 has a sufficiently large capacity relative to the infiltration flow rate, and evaporation also occurs, so the water accumulated in the rising gap 44 rarely reaches the upper end of the rising gap 44. Furthermore, when water accumulates in the rising gap 44, due to pressure, the water flows back from the rising gap 44 through the interface surfaces 56 and 57 and is returned to the chimney. As a result, it is possible to suppress or prevent water such as rainwater and condensation from leaking out of the chimney through the flange joint 4 from the inside of the chimney.

[0029] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, at least the upper surface of the lower flange 22 may be positioned higher than at least the upper end of the outer surface of the lower chimney unit 17, while the lower surface of the lower flange 22 may be positioned at the same height as or lower than the upper end of the outer surface of the lower chimney unit 17. A step may be formed between the chimney units 16 and 17, and the upper end of the lower chimney unit 17 on the inside of the chimney above the step may protrude above the upper end of the lower chimney unit 17 on the outside of the chimney above the step. [Industrial applicability]

[0030] This invention is applicable to chimneys installed in buildings. [Explanation of symbols]

[0031] 1. Building 3. Building chimneys 4. Flange joint 5. Insertion joint 10 Chimney Units 14 Integrated Chimney Piece 16 Upper chimney unit 17 Lower chimney unit 21 Upper flange 22 Lower flange 30 connecting bolts 31 Nuts 40 Connection means 41 Connecting plate 41a Rising section 42 Spacers 43 Watertight welds 44. Gap at the top 50 Heat-resistant gasket for chimney unit 51 Heat-resistant packing between flanges

Claims

1. A building chimney, which is attached to a building and includes multiple chimney units stacked vertically, The upper flange protruding outward from the lower end of the upper chimney unit, of the two chimney units adjacent to each other vertically, Of the two chimney units, the lower flange protrudes outward from the upper end of the lower chimney unit via a connecting means and is superimposed on the lower surface of the upper flange, A joining bolt that connects the upper flange and the lower flange, The connecting means is configured such that the upper surface of the lower flange is positioned higher than the upper end of the outer surface of the lower chimney unit. The connecting means has a connecting plate joined to the outer surface of the lower chimney unit, the connecting plate has a rising portion that protrudes above the upper end of the lower chimney unit and the lower end of the outer surface of the upper chimney unit, and the lower flange is joined to the upper end of the connecting plate. A building chimney characterized in that the space between the inner surface of the rising portion and the outer surface of the upper chimney unit directly faces the boundary between the lower end of the upper chimney unit and the upper end of the lower chimney unit at the lower end of the rising portion.

2. The building chimney according to Claim 1, wherein the connecting means has a spacer interposed between the portion of the connecting plate below the rising portion and the outer surface of the lower chimney unit, the rising portion is positioned away from the upper chimney unit in a plan view, a rising gap is defined between the outer surface of the upper chimney unit and the inner surface of the rising portion, and the lower end of the rising gap directly faces the boundary between the lower end of the upper chimney unit and the upper end of the lower chimney unit.

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