JPH08199852A - Jacket for chimney - Google Patents

Abstract

PURPOSE: To prevent formation of Karman vortex by providing a plurality of rib members of U-shaped cross section along the direction of height and on the surface of the outer periphery of a jacket main body covering chimneys. CONSTITUTION: This jacket 2 for covering a plurality of chimneys 1 has a cylindrical jacket main body 3 constructed by the assembling of a plurality of cylinders 3A divided into predetermined heights and a lid member 4 placed on an opening at the upper end of the main body 3. The jacket main body 3 is constructed by securing a flange member 6, which is mounted on the end of each cylinder 3A, to the flange member 6 of another cylinder 3A with bolts 5, and the upper end of each chimney 1 is projected from the lid member 4. Outside ribs 7 of U-shaped cross section for preventing formation of Karman vortex are placed along the direction of height on the outer peripheral surface of each jacket main body 3 and at predetermined circumferential intervals. Further, an annular vibrationproof rubber member is mounted on the inner peripheral surface of the jacket main body 3 so that vibration caused by wind is transmitted to the chimneys via the vibrationproof rubber member of great hysteresis, decreasing reaction forces at the restoration of the vibrationproof rubber member and effectively damping the amplitude of the vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stack of a chimney installed in a thermal power plant, a petrochemical plant, a refuse incineration plant or the like.

[0002]

2. Description of the Related Art Conventionally, a thermal power plant, a petrochemical plant, a refuse incineration plant, or the like is provided with a plurality of adjacent chimneys. It is supported by being covered with the body, and by covering with this outer cover, the landscape of the urban space is improved.

[0003]

As described above, the casing for covering and supporting the chimney is simply circular in cross section, and the countermeasure against the vibration of the casing due to the generation of Karman vortex is insufficient. There is a problem that is.

Therefore, an object of the present invention is to provide a chimney outer cover capable of solving the above problems.

[0005]

A means for solving the problems in the present invention is an outer casing for covering a chimney, which is arranged on the outer peripheral surface of the outer casing main body in the circumferential direction. A plurality of ridge members having a U-shaped cross section are provided along the height direction at predetermined intervals.

[0006] Further, a casing for covering the chimney, which has a U-shaped cross section along the height direction on the inner peripheral surface of the casing body at predetermined intervals in the circumferential direction. Is provided with a plurality of ridge members.

Further, a cover member for covering the chimney is provided with a support member projecting toward the outer peripheral surface of the chimney at a predetermined height on the inner peripheral surface of the main body of the outer cover. Further, a cushioning member that comes into contact with the outer peripheral surface of the chimney is provided.

[0008]

In the above means for solving the problems, the outer jacket main body is sufficiently reinforced by the plurality of ridge members having a U-shaped cross section provided on the outer peripheral surface of the outer jacket main body at predetermined intervals in the circumferential direction. The wind that collided with the body of the subject is disturbed by the ridge member,
It is possible to prevent the Karman vortex from being generated, and thus to prevent the vibration of the main body of the casing, thereby preventing the stack from collapsing or collapsing.

Further, the strength of the outer jacket body is improved by the ridge members having a U-shaped cross section provided on the inner peripheral surface of the outer jacket body at predetermined intervals in the circumferential direction. Further, the cushioning member provided on the inner peripheral surface of the outer casing body effectively damps the vibration of the outer casing body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a chimney outer cover of the present invention will now be described with reference to the whole perspective view of FIG. 1, the broken sectional view of FIG. 2 and the sectional view of FIG. Multiple chimneys 1 (4 in the figure) installed in parallel for thermal power generation, etc.
An outer casing body 2 for covering the outer periphery of the outer casing body 2. The outer casing body 2 is a cylindrical outer casing body 3 formed by assembling a plurality of cylindrical bodies 3A divided into predetermined heights. And a lid member 4 arranged at the upper end opening of the outer casing body 3.

The casing body 3 is constructed by fixing a flange member 6 attached to an end portion of each cylindrical body 3A to a flange member 6 of another cylindrical body 3A by bolts 5 to each other. The upper end of the chimney 1 projects from the lid member 4.

Outer ribs 7 having a U-shaped cross section for preventing Karman vortex generation are attached along the height direction on the outer peripheral surface of each outer casing main body 3, and the outer ribs 7 of the outer casing main body 3 are attached. They are arranged at predetermined intervals in the circumferential direction.

Further, as shown in FIGS. 2 and 3, an annular support 8 projecting toward the outer peripheral surface of the chimney 1 is provided at a predetermined position in the height direction of the inner peripheral surface of the outer casing main body 3, The supporting body 8 is composed of a supporting leg member 9 attached to the inner peripheral surface of the outer body 3 and a supporting plate member 10 integrally formed at the tip of the supporting leg member 9. An annular anti-vibration rubber member (having a large hysteresis, for example, a fender for mooring is used) 11 is attached to the inner plate surface of the member 10, and a flexible member is further provided on the inner surface of the anti-vibration rubber member 11. A ring-shaped barrier plate 12 having a property is attached, and the inner diameter of the barrier plate 12 is formed to be substantially equal to the outer diameter of the chimney 1.

Further, an inner rib 13 having a U-shaped cross section is attached to the inner peripheral surface of the outer casing main body 3 in the height direction of the outer casing main body 3, and the inner rib 13 is larger than the outer rib 7. A plate having a cross section is used, and a plate-shaped horizontal rib 14 curved along the inner surface of the outer cover 2 is attached between the inner ribs 13.

In the above structure, when the chimney 1 is blown with air, the chimney 1 is covered with the outer cover 2 and the outer rib 7 is attached to the outer cover main body 3, so that the plate-like shape is obtained. Is superior in strength to the ribs and the wind collides with the outer ribs 7 and is disturbed, thereby preventing the generation of Karman vortices, thus preventing the vibration of the outer casing body 3 and causing the chimney 1 to fall. Or collapse can be prevented.

Further, as compared with the case where the ribs attached to the outer casing body 3 are plate-shaped, the ribs having a U-shaped cross section can facilitate maintenance such as painting. Further, since the inner rib 13 and the lateral rib 14 are attached to the inner peripheral surface of the outer cover body 3, the outer cover body 3 has sufficient strength against strong wind.

Even if vibration is generated in the outer casing body 3 by wind, this vibration is transmitted to the chimney 1 via the vibration damping rubber member 11 having a large hysteresis, and when the vibration damping rubber member 11 is restored. Since the reaction force becomes small, the amplitude of vibration can be effectively damped.

Further, since the chimney 1 is covered with the jacket 2, it is excellent in appearance and can be matched with the urban space. In addition, although the lateral rib 14 has a flat plate shape in the above embodiment, the present invention is not limited to this. Even if the lateral rib 14 has a U-shaped cross section like the outer rib 7 and the inner rib 13, the above embodiment can be used. The outer casing body 3 can be reinforced in the same manner as.

[0019]

As is apparent from the above description, the present invention is provided with a surface of a casing body for covering and supporting a chimney,
Since a plurality of ridge members having a U-shaped cross section are provided along the height direction, the strength is superior to that of the plate ridge members, and the wind blown to the jacket is disturbed, which causes Karman vortex. Can be prevented, and the chimney can be prevented from falling or collapsing.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chimney casing body showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the same.

FIG. 3 is an enlarged sectional view of the same.

[Explanation of symbols]

 1 Chimney 2 Outer Body 3 Outer Body 4 Cover Member 6 Flange Member 7 Outer Rib 8 Support 9 Support Leg Member 10 Support Plate Member 11 Anti-Vibration Rubber Member 12 Impact Plate 13 Inner Rib

[Procedure amendment]

[Submission date] July 17, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

[0019]

As is apparent from the above description, the present invention is provided with a surface of a casing body for covering and supporting a chimney,
Since a plurality of protruding members having a U-shaped cross section are provided along the height direction, the strength is superior to that of a plate-shaped protruding member, and the wind blown to the outer cover is disturbed, which causes Karman vortex. Can be prevented, and the chimney can be prevented from falling or collapsing.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (3)

[Claims] 1. An outer cover for covering a chimney, comprising:
A plurality of protruding members having a U-shaped cross section are provided along the height direction on the outer peripheral surface of the outer cover main body at predetermined intervals in the circumferential direction thereof. . 2. A casing for covering a chimney, comprising:
A stack for a chimney, characterized in that a plurality of ridge members having a U-shaped cross section are provided along the height direction at predetermined intervals in the circumferential direction on the inner peripheral surface of the main body of the jacket. body. 3. A casing for covering a chimney, comprising:
A support member that projects toward the outer peripheral surface of the chimney is provided at a predetermined height on the inner peripheral surface of the outer casing body, and a cushioning member that contacts the outer peripheral surface of the chimney is provided on the support member. A chimney jacket.